Using the User Cost of Monetary Assets to Explain the Investment Portion of Gross Domestic Product

By Adam Bourgoin-Stone


Portrait of Adam Bourgoin-Stone



Over the summer, I have been co-writing a paper with Dr. Biyan Tang on the merits of utilizing the user cost of monetary assets rather than the interest rate in economic research, specifically research into the investment part of Gross Domestic Product. The paper itself is not complete yet, and the current results may change if errors in the regression are detected.  The paper has been submitted to present in a conference hosted by the Midwest Economics Association. This project has been and continues to be an incredible opportunity for me to not only learn more about economics, but also expand my critical reading and research skills.

Gross Domestic Product is often used in economics as an indicator of general economic growth. GDP is equal to Consumption + Investment + Government Spending + Net Exports. According to the Bureau of Economic Analysis, investment has remained at between 16% and 26% since 1947. Since investment is a significant portion of GDP, it is important to understand which factors correlate with it, and which factors can promote its growth. Based on traditional economic theory, the interest rate is negatively related to the level of investment that firms are willing to make. In other words, with a higher interest rate, investment will fall assuming other economic or political conditions remain the same. However, the relationship between the interest rate and investment can be unclear. Some research in the past has found a negative relationship; some has found a positive relationship; one paper found that the correlation changes significantly based on the interest rate level at the time of adjustment. A more intuitive tool for measuring investment as a part of GDP may be the user cost of monetary assets. The user cost is measured by the opportunity cost, or the forgone interest, of holding certain liquid monetary assets (like currency or checking account balance) versus holding pure investment assets. For example, if you held $1000 in cash, the user cost of your monetary asset would be the federal interest rate that you could have earned on the money had you kept it entirely in the form of investment assets such as treasury bonds. The user cost of monetary assets can be separated into the user costs for the various monetary aggregates, such as M1, M2, M3, and M4. A general overview of the monetary aggregates is that M1 contains the most liquid assets, and that each subsequent monetary aggregate contains the previous aggregate plus less liquid assets. For example, M1 contains physical currency, demand deposits, traveler’s checks, and other checkable deposits. M2 contains everything in M1, and also savings deposits, money market securities, mutual funds, and other time deposits.

Barnett (1978) derives a user cost formula for monetary assets:

where pit is the current period user cost of the per capita real balances of monetary asset i during period t, p*t is an aggregate index of the prices of good/services and of the prices of durable goods rental during period t, Rt is the yield on per capital bond holdings during period t, and rit is the nominal yield on monetary asset i during period t. The formula demonstrates that as the benchmark interest rate rises, the forgone interest rate increases with it.

The relationships of different economic factors with investment can be described using the Ordinary Least Squares regression

PriInv = b0 + b1(IntRate) + b2(rGDP) + b3(PubInv) +b4(PriCredit) + b5(CorpTax) + b6(Income) + b7(Inflat) + b8(TreasBond) + b9(Savings)

where the dependent variable is private investment in billions of dollars, and the independent variables are the interest rate, real GDP, public investment, credit available to the private sector, the effective corporate tax rate, aggregate income, the inflation rate, the treasury bond yield rate, and the savings rate. The user cost data was organized by the user costs for the different monetary aggregates (e.g. M1, M2, M3, M4). Two regressions were used, one using the interest rate, and the other replacing the interest rate with the user cost of monetary assets for M1. The adjusted R2, which is the percent of the variance of the dependent variable that is explained by the independent variables, was compared to determine whether the user cost is a better determinant of private investment than the interest rate. Regressions were run with the user cost for each monetary aggregate, with the regression that yielded the highest adjusted R2, the user cost for M1, being compared with the interest rate regression. The t-values of the interest rate and the user cost for each monetary aggregate were used to determine the statistical significance of each variable’s correlation with gross private investment. The statistical significance of each monetary aggregate’s user cost and the interest rate is visualized in Figure 1. Clearly, the interest rate is shown to have the most statistically significant correlation with the investment, and the user cost for M1 is shown to have the most significant relationship out of all of the user costs, though it is still statistically insignificant. Figures 2 and 3 show the interest rate and the user cost of M1 over time with gross private investment, respectively. The user cost and the interest rate are shown to be almost identical in proportion.

Figure 1, t-values of the interest rate and the monetary aggregate user costs


Figure 2, gross private investment and the interest rate over time


Figure 3, gross private investment and the user cost of M1 over time


The coefficients of each of the variables of the regression using the interest rate are shown in Figure 4. In this regression the interest rate is found to have a positive correlation with private investment. While at first glance, this seems contrary to traditional economic theory, this is likely because we did not add a lag to the regression. The relationship is shown to be positive because when investments fall, the federal reserve lowers the interest rate to stimulate investment, and when investment rises again, the federal reserve slowly returns interest rates to their previous values. The effective corporate tax rate was also shown to have a positive correlation, when a higher tax rate would be expected to lower the funds firms have at their disposal to invest, thereby reducing private investment. Figure 5 shows the regression using the M1 user cost (as that is the user cost that had the most significant correlation with investment, and the regression using the M1 user cost yielded the highest adjusted R2). The effective corporate tax rate is shown to have a positive relationship in this regression as well. In fact, most of the variables have similar values to the regression using the interest rate, except for the treasury bond yield rate and the inflation rate.

Figure 4, regression results for the interest rate. Standard errors are below coefficient values. *** – significant at 1% level. ** – 5% level. * – 10% level


Figure 5, regression results for the user cost. Standard errors are below coefficient values. *** – significant at 1% level. ** – 5% level. * – 10% level


The adjusted R2 of the regression using the interest rate was .9905, and the adjusted R2 of the regression with the user cost was .9881. This result is not unexpected, given the fact that the user cost was found to be statistically insignificant, while the interest rate was found to be significant at the 0.1% significance level, meaning that there is only a 0.1% risk of concluding that it is significant when it isn’t.

According to these results, the interest rate is probably a better variable than the user cost for explaining the variance of investment in the US. Secondary results include the statistical insignificance of the inflation rate when explaining investment, and also the inconsistency of the treasury bond yield rate’s significance. When using the interest rate, it was found to be mostly insignificant, but when using the user cost for M1, it was found to be significant at or above the 1% level. Based on these current results, I cannot conclude that the user cost of monetary assets is a more efficient factor than the interest rate for analysis of the investment part of GDP.

I want to thank the Dean of the UMass Dartmouth College of Arts and Sciences, Dr. Pauline Entin, for the generous stipend that I was granted for my summer project.

Works Cited in Paper

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Behavioral Expression of Anger in Preschoolers

by Sophia Baxendale

Over the summer and into the fall, I worked with Dr. Locke-Arkerson to learn to code facial, bodily, and vocal expressions of context-appropriate and inappropriate anger in preschoolers. I was awarded a summer research award for 2020 by the Office of Undergraduate Research, funded by the College of Arts and Sciences. The opportunity to work one-on-one with Dr. Locke-Arkerson has provided me with an excellent opportunity to learn more about behavioral data and research with children. Learning how to code and working with Dr. Arkerson has fostered confidence in my ability to learn different aspects of research, and I look forward to continuing to code this sample to learn more about emotional expression in different contexts.


Anger regulation involves the modification of emotional responses to situational changes (Thompson, 1994). Until now, research on anger expression has been limited to identifying children who show more anger than others in appropriate contexts (e.g., delay of gratification, blocked goals; Brooker et al., 2014; Cole et al., 2011; Gilliom et al., 2002). However, Dr. Locke-Arkerson has also measured anger during threatening and positive situations (context-inappropriate “CI anger”) (Locke et al., 2009; Locke et al., 2015). CI anger has been found to increase the risk of externalizing behavior and peer rejection (Locke & Lang, 2016; Locke et al., 2017; Locke et al., 2015). CI anger uniquely predicts these outcomes above and beyond CA anger. It also differs from the way anger has historically been studied, as its correlation with CA anger is only moderate. Dr. Locke-Arkerson’s research utilizes a novel approach to understanding emotional responses by studying them in distinct contexts to determine which children are unable to regulate anger responses in adaptive and acceptable ways.

The collection of behavioral data in research conducted with children has use beyond what is possible to collect from questionnaires. In order to translate collected behavioral data into ratings, a standardized and objective system of observation must be in place. The individuals rating of behaviors (“coding”) must reach a level of agreement, or interrater reliability. Once reliable, the individual coders can rate behaviors independently and these ratings can be used quantitatively for statistical analysis.

The aim of this project was to learn and become reliable in coding facial, bodily, and vocal expressions of context-appropriate and inappropriate anger in preschoolers. This project met the goal of obtaining acceptable interrater reliability for assessing the level of facial, bodily, and vocal expressions of anger during emotion-eliciting episodes in preschool-age children. CI anger in prior studies focused on facial expressions of anger in response to affective pictures, slides, and videos (Locke et al., 2015), making the data coded in this project unique.



Participants included 69 four-to-five-year-old children from preschools local to UMass Dartmouth.


Data used for this project was collected for a larger study exploring emotional and biological measures associated with behavior problems in children. For this project, I was trained on how to code expressions of anger during an anger-eliciting episode. Training on the coding of behavioral data required regular remote meetings and practice sessions with the master coder, Dr. Locke-Arkerson. Prior to training, Dr. Locke-Arkerson developed our training manual for the anger episode. I also filled out the coding sheets with the begin and end times of the episode for each individual subject. Dr. Locke-Arkerson reviewed the episode-specific manual and the System for Identifying Affect Expressions by Holistic Judgments coding system (AFFEX; Izard, Dougherty, & Hembree, 1989) manual with a graduate student, Samantha Clark, and myself. We were then assigned practice cases to code independently, and to discuss together. Samantha and I met several times to compare our codes, and then brought our discrepancies to Dr. Locke-

Arkerson. We reviewed the discrepancies as a group and worked together to determine our sensitivity level to minute expressions of anger. This training process took approximately 127 hours, which was followed by reliability coding, in which I was assigned cases to code independently for all four variables. My codes were compared to the Master Codes created by Dr. Locke-Arkerson and were reviewed to understand where we disagreed. Through the training and reliability process, Dr. Locke-Arkerson and I were able to completely code 24 participants and partially code 17 more for the anger-eliciting episode.


Context-Appropriate and Inappropriate Anger. Children were videotaped during episodes of the Laboratory Assessment Battery (LabTAB; Goldsmith et al., 1999), which were used to assess appropriate and inappropriate anger in distinct contexts (positive, threatening, frustrating).

Anger episode. The anger episode that was used for reliability training was the I’m Not Sharing game. During the I’m Not Sharing game, the experimenter shares candy with the child and will give themselves more candy than the child. In the end, the experimenter gives the child two pieces of candy.

Behavioral scoring. Coders rated anger facial, bodily, and vocal expressions during the episode using the LabTAB and Affex coding systems.

Pictured: A child playing I’m Not Sharing game.


Dr. Locke-Arkerson assigned me reliability coding for the different variables after an intensive training period. Agreement between my codes and the master codes were determined through a calculation of hits and misses for each variable: presence for vocalizations and bodily resistance, intensity for bodily and facial expressions of anger. The minimum Cohen’s Kappa score to be reliable was .7, or approximately 90% agreement with the Master codes. I was assigned 10 cases for each variable until I was reliable according to the calculated Cohen’s Kappa. I required 10 cases to reach a Cohen’s Kappa of .7 for bodily resistance, or instances where the child attempted to stop the episode. I required 21 cases to reach a Cohen’s Kappa of .7 for vocalizations of anger. I required 20 cases to reach a Cohen’s Kappa of .74 for bodily expressions of anger. I required 20 cases to reach a Cohen’s Kappa of .73 for facial expressions of anger. This means that I will be able to code reliably for the rest of the episode and other episodes moving forward to produce qualitative data that can be used quantitatively for data analysis to address study hypotheses. The coding completed through training and reliability amounted to around 60% of the total data set being at least partially coded for the I’m Not Sharing episode.


Over the course of this project, I accomplished my goal of becoming a reliable coder and leading to the near completion of coding all participants for the I’m Not Sharing anger-eliciting episode. With Dr. Locke-Arkerson’s commitment to this project and my training, I was able to learn how to code and become reliable. Given that we were unable to meet in person, my training required modifications to be the most effective for a remote modality. This meant meeting with Dr. Locke-Arkerson several times a week for up to three hours at a time to make sure that we were identifying the same behaviors as anger. The process of learning such a skill was exciting, as it enhanced my working relationship with Dr. Locke-Arkerson and allowed me to see a side of research that I had misunderstood in an academic setting previously. I did not understand the value of behavioral data, as I believed it to be too subjective. After going through such an intense and rigorous training process, I now have a better understanding of how behavioral data can be quantified. It was also exciting to be able to identify slight tells of anger in children, something I was not able to pick up explicitly when I helped administer the episodes prior to the pandemic. While I may have been able to sense frustration, I was not able to identify specific incidences of anger prior to watching the episode as a trained coder with an understanding of slight expressions of anger, especially in the body and face.

I anticipate being able to complete coding of our sample for I’m Not Sharing soon, to be followed by positive and non-social fear episodes. The positive episodes that may be coded include the Surprise! and Popping Bubbles episodes. The non-social fear episode that will be coded is the Scary Mask episode. I am excited to see how our sample expresses anger in contexts that would not be considered appropriate, allowing for more questions to be asked. The completion of coding will allow Dr. Locke-Arkerson and her lab to use the data to enhance the literature on child behavioral and emotional expression, as well as assisting findings in Dr. Locke-Arkerson’s ongoing study. This data will become a resource for myself and future research assistants to use for poster presentations and manuscripts. Specific analyses that this data set can be used for include assessment of the association between behavioral measures and a parent-report measure of CI anger (Locke & Lang, 2016). This data set may also be used to supplement an ongoing manuscript that Dr. Locke-Arkerson, Samantha Clark, and I are working on regarding children who withdraw.

Learning how to code and becoming reliable is a skill has been invaluable to my understanding of hands-on data processing and I am incredibly grateful for the opportunity to build on my research experience. It has been rewarding to gain perspective from both data collection and coding that I have had the opportunity to be a part of in Dr. Locke-Arkerson’s Child Emotion Lab. Thank you to the Office of Undergraduate Research and the College of Arts and Sciences, especially Dean Entin for expressing interest in this project and awarding me the funds to pursue it. The time invested in this project has and will continue to propel progress in our lab and the research program. Thank you to Dr. Locke-Arkerson for committing to this project and taking the time to strengthen my confidence in attention to detail.


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Izard, C. E., Dougherty, L. M., & Hembree, E. A. (1989). A system for identifying affect expressions by holistic judgments (Affex) (rev. ed.). Newark: University of Delaware, University Media Services.

Locke, R. L., Davidson, R. J., Kalin, N. H., & Goldsmith, H. H. (2009). Children’s context inappropriate anger and salivary cortisol, Developmental Psychology, 45(5), 1284-1297. doi: 10.1037/a0015975.

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Locke, R. L., Lemery-Chalfant, K., Brooker, R., Davidson, R. J., & Goldsmith, H. H. (2017, April). Physiological and behavioral outcomes associated with anger dysregulation. Paper presented at the Biennial Meeting of the Society for Research in Child Development, Austin, TX.

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Anthropogenic Road Noise Effects on Small Mammals

by Alyssa Giordano

Over the summer I worked on an experiment that investigated the effects of chronic road (anthropogenic) noise on free-living small mammals. I was a recipient of the 2020 summer research award from the Office of Undergraduate Research (OUR), which helped me greatly to pursue this research under the supervision of Dr. Michael Sheriff. I have always felt a strong connection to ecology and conservation biology, and this project has captivated me and rooted me further to this field, propelling me to pursue this kind of research in my career. This opportunity has helped me in deciding to continue my education to earn a master’s degree. I hope to pursue further projects related to anthropogenic effects, with implications to ecology and wildlife management.


Predators can alter prey populations through direct killing and consumption, but also through non-consumptive, risk effects (Peacor et al. 2020; Sheriff et al. 2020). Such effects include changes to behavior, physiology, fecundity, and survival. Small mammals for example are known to respond to predation risk by changing their habitat use, activity patterns, and foraging behavior (Lima 1998).

Chronic traffic (anthropogenic) noise has shown dramatic increases over the last few decades with the expansion of resources and transportation (Shannon et al. 2016). For example, the United States’ population increased by about one third and traffic nearly tripled between 1970 and 2007 (Barber et. al. 2010). Road noise can affect prey’s ability to perceive predation risk cues and, thus, alter their risk responses which can be critical to survival (Francis and Barber 2013; Shannon et al. 2016). Road noise is hypothesized to alter prey responses to predation risk in three distinct ways, i) mask auditory cues of predation resulting in greater antipredator responses, as prey have more difficulty detecting their predators and find the area riskier (Barber et. al. 2010), ii) mask and distract prey due to the excess of auditory signals resulting in a reduction in antipredator responses, as prey do not perceive the area as risky given they cannot detect their predators (Blumstein 2014, Chan et. al. 2010), or iii) be perceived as a threat itself, with increased antipredator responses above that with which prey respond to risk alone (Shannon et. al. 2016, Tyack et. al. 2011). Within this research I tested each of these hypotheses by examining the food intake and foraging behavior of free-living deer mice concurrently exposed to both road noise and predation risk. I predicted that if road noise resulted in an increase in antipredator behavior, small mammals would find the area to be riskier and forage less. If road noise resulted in a decrease in antipredator behavior, small mammals would be distracted by the excess sound and forage more. If road noise resulted in an increase in antipredator behavior when not concurrently treated with predation risk, small mammals would find the road noise itself risky and forage less.


To conduct my experiment, I used audio playbacks to manipulate the acoustic environment of free-living deer mice and other small mammals. My audio treatments consisted of non-predatory control, avian predators, road noise, and road noise + avian predators. Each treatment was played for three days, with a two day buffer between treatments to avoid contamination of effects from one treatment to the next. To measure foraging activity, I set up giving-up density (GUD) trays. GUDs are based on the marginal value theorem (Charnov 1976), such that the return of a foraging patch diminishes and the cost increases the more an animal forages, ultimately the animals ‘give up’ and move on (Brown et. al. 1999). The point at which an animal gives up has been shown to be impacted by predation risk (Brown 1988). Plastic foraging trays were filled with 2.5g of millet seed and 2 cups of sand (figure 1). Six trays were placed into the field for 2 consecutive 24 periods beginning at 0700h on days 2 and 3 of a treatment. Motion detecting cameras (purchased as part of the OUR grant) were deployed at 3 of the GUDs to measure foraging behavior. Each treatment was replicated three times and the total duration of the experiment occurred from July 1st to September 13th, 2020.

I analyzed the foraging data using 2-way ANOVAs and a tukey test with treatment and night as fixed effects (RStudio Desktop 1.3.1093).


I found that there was a significant effect of treatment and of night (Table 1) on the amount of food eaten by small mammals (Fig. 2). When exposed to predation risk small mammals decreased the amount of food eaten, when exposed to predation risk and road noise small mammals ate a similar amount, and when exposed to road noise alone small mammals slightly increased the amount that they ate compared to the control treatment.

I also found that small mammals ate more on night 2 compared with night 1 (Fig. 2).


This data supports the hypothesis that road noise will cause prey to reduce their antipredator responses to predation risk. (Chan et al. 2010) found something similar, that during noise exposure Caribbean hermit crabs allowed simulated predators to get closer, suggesting they had an impaired ability to respond. This may occur because prey have a harder time perceiving risk cues when also exposed to noise, creating a clouded soundscape. This will have consequences to prey by exposing them to predators more, as the prey will not engage in antipredator responses as much or as fast.

I still need to analyze the behavioral data from the motion detecting cameras with footage taken over 2.5 months. The video footage will be analyzed for the number of visits to the GUDs, the time spent during each visit, and the time spent being vigilant. This portion of the project will delve deeper into the specific effects on animal risk response when exposed to chronic road noise and predation. I have determined the general effect of chronic road noise, but it will be very interesting to see their true behavior, and if it shows anything that the preliminary foraging data cannot.

A special thanks to the Office of Undergraduate research and the College of Arts and Sciences for providing me with funding for my project. Though the analysis is not yet fully complete, the funding has given me an invaluable opportunity to explore an important wildlife conservation topic in depth. Finally, I’d like to acknowledge and thank Dr. Michael Sheriff for the support and guidance throughout my project.


Barber, J. R., Crooks, K. R., & Fristrup, K. M. (2010). The costs of chronic noise exposure for terrestrial organisms. Trends in ecology & evolution, 25(3), 180-189.

Blumstein, D. T. (2014). Attention, habituation, and antipredator behaviour: implications for urban birds. Avian urban ecology, 41-53.

Brown, J.S., Laundre, J.W., & Gurung, M. 1999. The ecology of fear: optimal foraging, game theory, and trophic interactions. Journal of Mammalogy 80: 385-399.

Brown, J.S. 1988. Patch use as an indicator of habitat preference, predation risk, and competition. Behavioral Ecology and Sociobiology 22: 37-47.

Chan, A. A. Y. H., Giraldo-Perez, P., Smith, S., & Blumstein, D. T. (2010). Anthropogenic noise affects risk assessment and attention: the distracted prey hypothesis. Biology letters, 6(4), 458-461.

Charnov, E. L. (1976). Optimal foraging, the marginal value theorem.

Francis, C. D., & Barber, J. R. (2013). A framework for understanding noise impacts on wildlife: an urgent conservation priority. Frontiers in Ecology and the Environment,11(6), 305-313.

Lima, S.L. 1998. Nonlethal effects in the ecology of predator-prey interactions. What are the ecological effects of anti-predator decision-making? BioScience 48: 25-34.

Peacor, S. D., Barton, B. T., Kimbro, D. L., Sih, A., & Sheriff, M. J. (2020). A framework and standardized terminology to facilitate the study of predation‐risk effects. Ecology, e03152.

Shannon, G., Crooks, K. R., Wittemyer, G., Fristrup, K. M., & Angeloni, L. M. (2016). Road noise causes earlier predator detection and flight response in a free-ranging mammal. Behavioral Ecology, 27(5), 1370-1375.

Sheriff, M. J., Peacor, S. D., Hawlena, D., & Thaker, M. (2020). Non‐consumptive predator effects on prey population size: A dearth of evidence. Journal of Animal Ecology.

Tyack, P. L., Zimmer, W. M., Moretti, D., Southall, B. L., Claridge, D. E., Durban, J. W., … & McCarthy, E. (2011). Beaked whales respond to simulated and actual navy sonar. PloS one, 6(3).

Neuronal Protection Effects of Blueberries through Inhibition of Key Enzymes involved in the Neurogenerative Diseases

By Chelsea Spitz

This past summer, I was awarded a grant from the Office of Undergraduate Research (OUR) to conduct research in the Chemistry Department under the guidance of Dr. Shuowei Cai. The purpose of this research is to study the neuronal protection effects of blueberries against neurodegenerative diseases and develop the extraction method for blueberries. I also planned on identifying active compounds in blueberries and develop a LC-MS based method to fingerprint the blueberry extract from other extraction methods. Unfortunately, due to the ongoing pandemic, I could not get access to LC-MS system, therefore, my research is mainly focusing on development of extraction method and study the neuronal protection effects of blueberries through inhibition of key enzymes involved in the neurodegenerative disease, including the inhibition kinetics, to understand the mechanism of the neuronal protections of blueberries.

Alzheimer’s disease (AD), the most common form of dementia, is a neurodegenerative disease affecting the structural integrity of the brain. Individuals suffering from AD undergo both steady memory loss and significant cognitive decline as a result of the progressive neuronal damages leading to the death of neurons in brain. AD accounts for 60 to 80 percent of dementia cases, while vascular dementia, due to microscopic bleeding and blood vessel blockage in the brain, is the second most common cause of dementia (Alzheimer’s Association, It is estimated that one in 10 Americans over 65 years of age is currently living with symptomatic AD, and worldwide, 50 million people live with symptomatic AD. AD puts a huge burden on both caregivers and the health system. In 2018, the direct costs to American society for caring of those with AD totaled $277 billion, and it is projected to over $1 trillion by 2050 ( Yet, there is no cure for AD and only a handful of drugs have been approved by FDA to manage the symptoms that includes cholinesterase inhibitors and N-methyl-D-aspartate receptor (NMDA) receptor antagonist (i.e. memantine). There is even no treatment that can slow down the progresses of the disease. This may be partly due to the lack of knowledge of the mechanism of AD.

Based on the differences seen in AD’s brains, several potential causes have been hypothesized: deficits in the cholinergic transmission; beta-amyloid plagues (Aβ); tau tangles; oxidative damage and mitochondrial dysfunction; neuronal inflammation; synapse loss; vascular changes; endosomal abnormalities, among others. Several of those hypotheses have been found to be connected to each other, and collectively, they lead to the neuron death. For example, acetylcholinesterase (AChE) is a critical enzyme to regulate the level of the neurotransmitter, acetylcholine. Both Aβ and abnormally hyperphosphorylated tau (p-tau) can increase AChE expression. The increased AChE further influences PS1 and tau-protein kinase GSK-3β. GSk-3β induces hyperphosphorylated tau (P-tau), while PS1 affects the APP processing and Aβ production. Inhibition of AChE not only can rescue the deficit of cholinergic transmissions, but also can potentially reduce Aβ and P-tau.

Tyrosinase is a key enzyme in the biosynthesis of melanin. It catalyzes two reactions: the hydroxylation of tyrosine to L-DOPA and the subsequent oxidation of L-DOPA to dopaquinone. This enzyme may also oxidize dopamine to form melanin pigments through the formation of dopamine quinone, a reaction results in the formation of highly reactive oxygen or nitrogen species (ROS) capable of inducing neuronal cell death. Oxidation stress links to both inflammation and endosomal abnormalities, which hold key for neurodegenerative diseases, including AD.

Our research, therefore, is focusing on examination of neuronal protection effects of blueberries through their inhibition of AChE and tyrosinase. Most phytochemicals are extracted from plants using methanol-based solvent. Residual methanol is highly toxic for human consumption. To explore a safer solvent for extraction of phytochemicals from blueberries, we investigate using ethanol as the extraction solvent. Over the course of the summer, we extract the polar components from blueberries using three different types of solvent system: ethanol alone; methanol alone, and methanol/acetone/water/formic acid (40/40/19/1). Our lab has been used the methanol/acetone/water/formic acid extraction system for extraction of blueberries, and our aim is to compare the biological activities of the blueberry extract using ethanol with those with methanol-based extraction. The activity of AChE was examined using the Ellman method, the tyrosinase activity is determined using L-DOPA as the substrate and monitored the enzymatic product at 490 nm. Both assays were carried out using 96-well microplate, and each sample was run triplicate. To further study the mechanism of inhibition on tyrosinase, we carried out the inhibition kinetics with the blueberry extract from ethanol. The kinetics of tyrosinase was measured every 20 s in 3 min to obtain the initial velocity rate. The contraction of blueberry extract used for inhibition kinetic measurement was 0.25 mg/ml and 0.15 mg/ml.

As shown in Figures 1,2 and 3, the extracts from all three solvent systems showed strong inhibition on AChE and tyrosinase. The extract from methanol/acetone/water/formic acid solvent showed the strongest inhibition on both enzymes. The USDA solvent mixture inhibited the enzymes approximately double that of the other two solvents while the USDA MDS and USDA EDS extracts inhibited relatively close to one another. The methanol-based extract however was still slightly stronger than the ethanol-based extract but overall, they were relatively the same. The IC50s show that the USDA Solv mixture is a much stronger inhibitor than the other two solvents because it requires a lower concentration of the extract to inhibit 50% of the enzyme.

Table 1: IC50 Values For Tyrosinase and AChE

Solvent Mix MDS EDS
Tyrosinase 0.17 mg/mL 1.66 mg/mL 1.14 mg/mL
AChE 0.72 mg/mL 3.48 mg/mL 6.89 mg/mL


While blueberry extract from ethanol showed less potent as that from methanol-based solvent, it still showed strong inhibition on two key enzymes that related to neurodegenerative diseases. Here, we demonstrated that ethanol can be a safe alternative to extract the bioactive phytochemicals. We further examined the inhibition kinetics of blueberry extract from ethanol to understand the inhibition mechanism on tyrosinase. As shown in Figure 4, the blueberry extract inhibits tyrosinase in a non-competitive manner (mixed mode inhibition). The inhibition constant Ki and Ki’ are 0.056 mg/ml and 0.82 mg/ml, respectively (Table 2). This suggested that the compounds in blueberry both directly interact with the active site of tyrosinase the substrate-enzyme complex.

Table 2: Inhibition Constant of Blueberry Extract

KI (mg/ml) KI’ (mg/ml)
0.25 mg/ml 0.060 0.079
0.15 mg/ml 0.051 0.085
Average 0.056 (0.006)* 0.082 (0.005)

*: the figure in parenthesis is the standard deviation from the two concentrations of blueberry extract


Future Plan:

The plan to continue this project consists of continuing to perform more kinetics assays using USDA MDS extract and to try and see if the data is reproducible. We also plan to work on modeling and studying the structure of the enzyme more closely as well as the compounds found in the extracts from the LC-MS data. Once we gain the access to LC-MS instrument, we will identify the compounds in the ethanol extract, and compare with those from methanol-based extracts. We will further be using NMR to confirm the compounds identified from LC-MS.

The research grant I received from the Office of Undergraduate Research allowed me to learn new skills in the lab such as the enzyme kinetics assays as well as help me find my footing for my research goals. I would like to thank my research advisor Dr. Shuowei Cai for guiding me along the way. As well as the Dean to the College of Arts and Sciences, Dean Entin, and the Office of Undergraduate Research for funding my research this summer.

Harbor seal vibrissa morphology inspires comprehensive computational simulations and experiments studying footprints left behind moving hydrodynamic objects for online database

By Sarah Dulac

My OUR project was rewarded with a grant this summer 2020, from the Office of Undergraduate Research (OUR) to conduct research via Remote desktop due to the recent pandemic under supervision of Dr. Banafsheh Seyed-Aghazadeh. My OUR research project was entitled ‘Harbor seal vibrissa morphology inspires comprehensive computational simulations and experiments studying footprints left behind moving hydrodynamic objects for online database’.

The objective of the research is to experimentally and computationally quantify the left behind footprint from different hydrodynamic objects at varying velocities, to help better understand how the harbor seal’s whisker reacts to these stimuli like a sensor. Using both the experimental and computational data collected, another goal was to create an online platform that would provide valuable data to numerous other research projects and educational purposes to anyone looking to learn. This was a fully remote project and some of my tasks are yet to be completed due to my limited access to the needed campus facilities. This project depended heavily on self-reliance, which allowed me to gain new skills including literature review to Computational Fluid Dynamics.

In order to understand how the harbor seal whisker detects the hydrodynamic pattern from a fast-starting fish, investigating the flow response of stationary cylinders with different cross-sections is principal. The information about possible flow characteristics of a left behind footprint is not available in literature, which is a crucial step to better understand the mechanism behind this “sensing”. The first step towards better understanding of these footprints left behind, is to investigate the flow response of the cylinders with different cross-sectional geometries using Computational Fluid Dynamics (CFD). Flow past a circular cylinder is the foundational start to a path for studying more complex shaped bodies and their footprint’s produced. The case of flow past a circular cylinder has a great deal of attention in research due to its simplicity of flow results and it is a very common phenomenon in engineering applications.

Starting with building and running computational simulations on COMSOL Multiphysics simulation software was a challenge considering my first step was to learn how to use the fluid flow module before successfully modeling my application. I found numerous resources online that allowed to me build my knowledge on how to correctly model my simulation. In order to verify my simulation is running correctly, data including RMS lift CL, mean drag coefficient CD, and Strouhal number St were gathered and analyzed to verify quantitatively.

Where L, D, ρ, U, A, ƒ, and d are lift force, drag force, density, inflow velocity, area, frequency of vortex shedding, and diameter, respectively. A computational model was constructed using the laminar flow module under fluid flow on COMSOL Multiphysics. The governing equations are the incompressible Navier-Stokes equation(1) which represents the conservation of momentum and the continuity equation(2) which represents the conservation of mass.

The domain was computed using laminar flow model in COMSOL Multiphysics because of the flow being in the range of Reynolds number equal to 100, characterizing the flow as laminar. Reynolds number is a dimensionless quantity that predicts whether the flow of a fluid on a surface is laminar or turbulent.

Where, ρ, U, d and μ are density, inflow velocity, diameter and dynamic viscosity, respectively. The domain and the constructed mesh is shown in Figure 1. Experiment[4] and simulations[1,2,3] of flow past a circular cylinder were used to compare my results. Simulations[5,6,7] of flow past a square cylinder were used to compare my results. Experiment[9] and simulation[8] of flow past a triangular cylinder were used to compare my results. Results of mean drag coefficient for circular, square and triangular cylinders are all plotted in Figure 2. Results of RMS lift for circular and square cylinders are all plotted in Figure 3. Results for the triangular cylinder were not plotted in this figure due to the reference literature using mean lift coefficient alternatively, which resulted in a value of zero because of the symmetry of the geometry. Strouhal numbers were also plotted for all cylinders as shown in Figure 4. From comparison of my resulting values and what is found in literature, I was able to confirm my simulation was running correctly.

Along with gathering and analyzing RMS lift, mean drag coefficient and Strouhal number qualitative methods of visualizations were used as well. The post processing tools offered on COMSOL Multiphysics have allowed me to plot the vorticity of the flow past the cylinders as shown in Figure 5. A tutorial of how to set up the CFD simulations and post process important data will be created to serve as an educational tool for MNE 332 – Fluid Mechanics and for an online library with open access.

There was one other task I was able to complete due to the needs of the task being accessed remotely. This task consisted of designing and constructing a three dimensional (3D) model of the whisker geometry using solid modeling computer-aided design program (SOLIDWORKS), which was available through UMassD remote access. The final design of the whisker has been completely modeled using SOLIDWORKS (Figure 6) and it ready to be 3D printed. For my future with this project, it consists of experimentally investigating the flow response of stationary cylinders with different cross-sections including the whisker geometry designed. The data gathered from all CFD simulations and experiments will be organized in a way, so it is easy to navigate and access via the online library.


[1] Park, J., Kwon, K., & Choi, H. (1998). Numerical solutions of flow past a circular cylinder at Reynolds numbers up to 160. KSME International Journal, 12(6), 1200-1205. doi:10.1007/bf02942594

[2] Singha, S., & Sinhamahapatra, K. (2010). Flow past a circular cylinder between parallel walls at low Reynolds numbers. Ocean Engineering, 37(8-9), 757-769. doi:10.1016/j.oceaneng.2010.02.012

[3] Tezduyar, T., Mittal, S., Ray, S., & Shih, R. (1992). Incompressible flow computations with stabilized bilinear and linear equal-order-interpolation velocity-pressure elements. Computer Methods in Applied Mechanics and Engineering, 95(2), 221-242. doi:10.1016/0045-7825(92)90141-6

[4] Tritton, D. J. (1959). Experiments on the flow past a circular cylinder at low Reynolds numbers. Journal of Fluid Mechanics, 6(4), 547-567. doi:10.1017/s0022112059000829

[5] Sohankar A, Norberg C, Davidson L. Low-Reynolds-number flow around a square cylinder at incidence: study of blockage, onset of vortex shedding and outlet boundary condition. International Journal for Numerical Methods in Fluids 1998; 26:39–56.

[6] Sahu AK, Chhabra RP, Eswaran V. Two-dimensional unsteady laminar flow of a power law fluid across a square cylinder. Journal of Non-Newtonian Fluid Mechanics 2009; 160:157–167.

[7] Singh AP, De AK, Carpenter VK, Eswaran V, Muralidhar K. Flow past a transversely oscillating square cylinder in free stream at low Reynolds numbers. International Journal for Numerical Methods in Fluids 2009; 61:658–682.

[8] Bao, Y., Zhou, D., & Zhao, Y. (2009). A two-step Taylor-characteristic-based Galerkin method for incompressible flows and its application to flow over triangular cylinder with different incidence angles. International Journal for Numerical Methods in Fluids. doi:10.1002/fld.2054

[9] Seyed-Aghazadeh, B., Carlson, D. W., & Modarres-Sadeghi, Y. (2017). Vortex-induced vibration and galloping of prisms with triangular cross-sections. Journal of Fluid Mechanics, 817, 590-618. doi:10.1017/jfm.2017.119


Southeastern New England Marine Science and Technology Workforce Gap Analysis

By Salvador Balkus

Recent research by the UMass Dartmouth Public Policy Center has demonstrated that Southeastern Massachusetts, also known as SENE, has been largely excluded from the thriving Greater Boston innovation economy. Meanwhile, the traditional maritime-related economic drivers of the region have encountered many economic challenges in recent years. As a result, UMass Dartmouth has risen to the task of developing a Southcoast Blue Economy Corridor in order to strengthen the region’s maritime sector. New technologies in blue economy-related industries will be imperative to the success and revitalization of the maritime sector in the region, and as such, an initial goal of this project is to conduct a comprehensive assessment of the Marine Science and Technology (MST) sector in and around the region. This portion of the project has been taken up by the Public Policy Center.

Working at the Public Policy Center with support from the Office of Undergraduate Research, I spent this summer completing an important component of this research project: conducting a gap analysis for the SENE Marine Science and Technology regional workforce. My job was to analyze the occupations most relevant to the sector, create a profile of the “high priority occupations” which are critical to the operations of MST firms and pose a great challenge to attract and hire, and determine the gaps between the educational programs currently offered in SENE and the education necessary for MST workers. To analyze the Marine Science and Technology sector workforce, I relied on an inventory of Marine Science and Technology firms, survey data, and key informant interview notes from the Public Policy Center, as well as economic data from Emsi, an economic modeling software. This workforce assessment will help the university inform policy decisions and succeed in their endeavor of successfully creating a Blue Economy Corridor.

NAICS, which stands for North American Industrial Classification System, is a standardized, code-based classification for industries. My first task was to determine an appropriate NAICS-based definition of the Marine Science and Technology sector that would include all of the private MST companies in the region. To do this, I obtained two different lists of NAICS codes. The first was compiled by the UMass Donahue Institute, while the second came from the NAICS codes of all businesses contained in the PPC inventory of Marine Science and Technology firms. I performed an analysis of the MST sector using both of these codes to obtain as accurate a picture of the sector as possible.

Using the Emsi Staffing Patterns tool, I compiled a list of all of the occupations employed by businesses in the MST sector. However, even if an occupation is employed within one of the industries that makes up the sector, it is not necessarily an important occupation to the sector as a whole. In order to identify the high priority occupations – those which are both critical to the operation of MST firms and also pose a challenge to attract and hire – I used data science techniques to rank the importance of each occupation to the sector. A high-priority occupation is defined by one or more of the following metrics:

  • High number of jobs in Marine Science and Technology industries, indicating that many workers of this occupation are needed in the sector.
  • High ratio of Marine Science and Technology jobs to total jobs for the occupation in the region, indicating that this job is relatively unique to the sector.
  • Large difference between growth in Marine Science and Technology industries and growth overall, indicating that the occupation’s employment is growing faster than normal.
  • Low Location Quotient (LQ), indicating that the region has a low concentration of workers in this occupation compared to the rest of the country.

For presentation, I decided to select the top 25 occupations as the high-priority occupations; these are shown below. These occupations fell into three neat categories: engineering, production, and natural science, each of which requires different types of education and preparation. Further research was also performed using Emsi to get a sense of the tasks that these occupations perform, as well as analyze commuting patterns within these occupations.

     Figure 1: Priority Occupations for SENE Marine Science and Technology sector, 2018

Next, I analyzed PPC survey data. This data allowed me to examine the importance of various worker qualifications to MST employers, see what type of degree one would need to work in Marine Science and Technology, and explore the relationship between MST businesses and universities within Southeastern New England. This informed me which educational areas I should focus on researching. I also used text-entry responses from the survey, which asked which skills and types of worker were most difficult to find for MST firms, as well as notes from key informant interviews conducted by the Public Policy Center to inform further research.

From the survey, I found that an education in engineering is the most important qualification for workers in MST, along with related skills such as lab experience, qualification in advanced manufacturing or precision machining, and quality control experience. Companies typically require 4-year or graduate degrees. The biggest workforce-related challenge is finding workers with the right technical skills for the job. Despite the importance of engineering education, less than half (40%) of respondents considered universities in the region a source of skilled labor for the business. Free response survey questions and interview data also indicated that the most difficult workers to find were software engineers and skilled manufacturing workers.

An example of the survey data was shown below.

     Figure 2: Sample chart created from the PPC survey data

After going over the survey and interviews, I researched available programs in engineering and production, the two groups of occupations found to be of the greatest priority to the sector. These were compiled into list graphics for the final report. A chart showing the available engineering degrees is shown in Figure 3. The region offers a wide selection of traditional engineering degrees, including computer science, the field with the most bachelor’s degree programs. The engineering field with the lowest number of degree programs is software engineering. Furthermore, the region offers five programs that teach advanced manufacturing, machining, or welding skills, though the Massachusetts side of SENE includes an abundance of high-school programs offered through vocational schools across the region.

     Figure 3: Engineering programs available in the SENE region

One of the scarcest and most highly sought-after occupations in MST is that of the software engineer – specifically, the occupation of “systems software developer” as defined by the Bureau of Labor Statistics. Despite the abundance of computer science degrees, my research found that most do not teach the hardware and software engineering skills necessary to work as a software engineer in the sector. These skills are mostly found in computer engineering and software engineering programs, two of the least abundant engineering programs in SENE. An adequate education for a systems software developer to fix this educational gap would include aspects of both computer engineering and software engineering.

In addition to software engineering, the other occupation type facing a significant workforce gap is that of the skilled production worker. In other words, the region needs to train more welders and machinists. As well as receiving an education in the necessary skills for the job, these workers also must go through an apprenticeship in order to be ply their trade. My research found that apprenticeships in the region are scarce, and access to those that do exist is controlled by unions, which may be hard to enter if one did not have the foresight in eighth grade to attend a vocational school. Furthermore, interest in production jobs among middle and high school students has been waning over the past eight years. If unions developed a new strategy to attract workers, or if new businesses arose that allowed welders and machinists to gain experience as apprentices and go on to work at an MST business, this educational gap in production may be eliminated.


Through this summer research project, I was able to practice my data analysis skills while also improving my writing ability and collaborating with other researchers. In the future, when I go on to work in the data science field, these skills will make me a more well-rounded employee and increase my employment prospects and work quality, for which I am very glad. Likewise, I am also prepared to do further research during my undergraduate career. I would like to thank the Public Policy Center for giving me the opportunity to work on this project, and specifically research associate Michael McCarthy for providing valuable report-writing advice. Thank you, Office of Undergraduate Research, for allowing me to work on such a valuable project!

Allegorical Representation: Objects of Grief

by Addi Catarina

Throughout this artistic exploration of grief and loss, I have learned a lot about myself and others. I began this journey by painting various objects that remind me of my sister (Fig.1), who passed away in 2016. I was able to communicate my own experiences and emotions through metaphor in those paintings, but knew that I would have to reach further if I wanted to understand grief and loss more completely. Over the past two semesters, I began to reach out to others and incorporate their stories into the narratives of my paintings. The result is the completion of the first phase of my series Objects of Grief: ten paintings that depict my personal experience and that of two of my close friends.

Throughout this process, I have been able to identify and share objects that remind me of my sister and have them serve as the vehicle for my investigation of loss and grief. However, my goal was to expand my series to include the experiences of others. I hoped that this would capture a more complete representation of grief and begin to facilitate a dialogue on a subject that is not always easy to discuss. In my search for stories, I decided to start with the people who I had a comfortable, trusting relationship with. I interviewed my friends and family in an informal, conversational format. I felt that a survey or list of interview questions would make the conversation too impersonal and sterile. I wanted show respect to the interviewee, and allow them to be in charge of what they shared and what they kept private. Many of those who I reached out to were willing and eager to share, and the fluid nature of the conversation brought out much more than I think could be captured in a rigidly formatted interview.

While interviewing my friends and family, it became obvious that their objects evoked many different emotions, that were sometimes conflicting. Like my experience with the dresses, the people I interviewed also saw these objects as simultaneous reminders of the good memories and tragic loss.

My friend Tess, who lost her mother many years ago, instantly identified an old Christmas ornament that her mother made when she was young. She chuckled while telling me about it because although she described it as “hideous” and falling apart, it reminded her of her mother’s beauty and humor. When she told me about the ornament and her mother, I saw both joy and sadness in her eyes. I felt like, for a moment, I had a glimpse of who her mother was and how much Tess missed her. It felt special to share that moment, and I asked her if I could paint the ornament. This will be my next painting in the series.

My best friend Michaela was also willing to share her story, but expressed very different emotions than Tess. Michaela also lost her mother, but their relationship was strained due to alcohol abuse and other tensions in their family. She identified two beautiful items that her

mother left behind- a pearl necklace and a book of Jane Austen’s novels. She explained that these items reminded her of the good parts of their relationship, however difficult they were to see at times. When painting Michaela’s items, I wanted to use the beautiful objects as a metaphor for what could have been. Buried under the stress of their relationship, there was the potential for reconciling and building a good future. Now that her mother has passed away, that chance is no longer there. In the triptych (Fig. 3), the necklace is slipping away, leaving emptiness and uncertainty behind.

This series has given me time to reflect on my own loss, while learning from others. I hope that these paintings will help pave the way for real, open conversations about grief and loss. In these unprecedented times, many people are experiencing sudden loss simultaneously. Though it is tragic, I believe this collective experience of loss will begin to shift the perception of grief and encourage people to embrace their own emotions, share their experiences without fear, and support each other through loss.

So far, I have shared the works from my initial series online with a national support group called “The Compassionate Friends,” and in the Conversations exhibition at the CVPA Campus Gallery, November 6 – December 5, 2019. I am excited to share the expansion of the project soon. I spoke to an administrator for the Compassionate Friends support group, who suggested I display my artwork at their annual convention. I believe this would be a great place to show these works, surrounded by those who can directly relate to the message. Although that will not happen this year due to Coronavirus restrictions, I certainly plan to continue my work on the series. By the time the next convention can be held, I will have even more to share with my audience. I would like to also exhibit the series in additional venues, including galleries and public spaces, in order to further the very important and necessary conversation about loss and grief.

“Objects of Grief” Series

Fig 1:   Absence (Diptych), 2019. Oil on Panel, 48” x 24” each

Fig 2: Necklace (study), 2019. Oil on Paper. Approximately 10” x 8”

Fig 3: Necklace (Triptych), 2019-2020. Oil on panel.  14” x 8”, 16” x 12”, 14” x 8”

Fig 4: Fragments, 2019-2020. Oil on panel.  6” x 6” each

Future paintings:

Tess’s mother’s ornament

Michaela’s mother’s book

Summer 2018 Undergraduate Research Funded by OUR, Zachery Herrera

Optimum Design of 3D Printed Polymeric Composites: Biomedical implants

By Zachary Herrera

This summer of 2018 I was rewarded with a grant from the Office of Undergraduate Research (OUR) to conduct research within the Bioengineering and Mechanical engineering Labs under Dr. Lamya Karim and Dr. Vijaya Chalivendra. I collaborated with Mechanical Engineering student David O Okide to conduct a research project pertaining to the development of 3D printed polymeric composites, studying the process and properties of our biomaterial of interest. This was an interdisciplinary project allowing me to gain new technical skills from the bioengineering and mechanical engineering fields. Since I entered this field of study my dream has been to produce a device or product that will someday improve the lives of patients who suffer, and this has driven my interest in investigating new innovative materials such as thermoplastics to replace bone. Through this OUR-funded project I was able to apply my interests through in-lab experiments and research.

As recent studies show, diseases such as arthritis and diabetes have become more and more common raising the number of skeletal fractures that occur and operations required to heal damaged bone, thus indicating a need for bone replacements. In this study, I looked into ways to combine different thermoplastics and nanoparticles to increase biocompatibility and mechanical properties of the material. By combining plastics and nanoparticles together the overall strength of the material can be improved and continue to be biocompatible compared to using each polymer individually. Looking towards 3D printing allows us to produce custom-made products and replacements using our desired composite. In order to use 3D printing the desired material must first be created into a filament with specific parameters in order to construct a product for further testing.

Starting with thermoplastic ABS and Carbon nanotubes (CNT) that were readily available, our first step was to determine a process of mixing each material. I chose to use a multi-stepped process using Solvent Casting to dissolve ABS and sonication along with shear mixing to combine 1% CNT within the solution. I used a sonicator and shear mixer to complete this task while adding acetone as my solvent. This was done for 2hrs maintaining a constant temperature of about 55℉. Once materials were done mixing, the mixture was poured onto a sheet of aluminum foil and allowed to dry overnight, shaping our composite into a film (Figure 1)

Figure 1: ABS+1%CNT film used to create filament

The second aim of this project was to create a viable filament with a constant diameter of 2.85mm. In order to carry out this step we assembled our first extruding machine in lab, which was purchased from a 3D printing company called Filastruder (displayed in Figure 2). Once our film was dry, we cut each filament into small squares in order to feed them into the extruding chamber, we then drilled a 2.7mm hole into the nozzle of the extruding machine before extruding to test the change in diameter.

Figure 2: Extruding machine assembled in lab used to create filament

We then maintained a temperature at about 195℃ and the pieces were slowly fed into the extruder through the hopper to create a filament (Figure 3). As the extruder was running we observed a change in shape and texture of the filament from a grainy squeezed shape to completely solid usable filament, by the end becoming bubbly and warped as the material was depleted.

Figure 3: ABS+CNT filament

By examining the texture we found that the filament was not solid enough to be used for further experiments. This simply may be due to the amount of our starting material and by scaling up, could grant us with enough solid filament to use the 3D printer. From the results gathered on the diameter we did not have a constant size suitable for the 3D printer, averaging a measured 3mm. This may be due to the large nozzle size, allowing the filament to expand giving us a larger measurement. One way proposed to fix this issue is to use a type of winder to apply constant tension force onto the filament as it feeds through the tip of the nozzle. Although we did not move onto the 3D printing stage, great progress was made:

  • First filament extruding machine (Filastruder) has been assembled and properly used to create a filament.
  • CNTs within a polymeric composite were successfully mixed and dispersed, acquiring a working method.

Furthering my work in the bioengineering department, I was able to repeat my method using a tougher polymer called Polylactic acid (PLA). Specifically, I used PLA as my thermoplastic and Titanium Dioxide (TiO2) as the nanoparticle but because PLA is tougher to dissolve chloroform was used as my solvent. This process was moved to a fume hood to contain the toxic fumes also aiding in the drying phase of the solvent casting step. After obtaining a small sample of PLA/TiO2 composite (Figure 4) I was able to test the effectiveness of the process using superior materials.

Figure 4: PLA+1% TiO2 composite

Since this process and ground work laid out shows promising results, further work is needed to integrate our filaments into the 3D printer for testable prints. Therefore, the next step of this project is to confirm the correct amount of PLA combined with chloroform and TiO2 and create a usable filament meeting the required diameter. Next step would be to print dog-bone shaped tensile bars for further mechanical testing and circular disks to test cellular activity and biocompatibility to ultimately be placed within the body. My long-term goal for this project is to determine a usable mixture of thermoplastics and nanoparticles to reach similar mechanical and biological properties as cortical bone to fabricate load-bearing implants.

My research allowed me to explore my interests and different aspects of engineering that I otherwise would not have been able to. I learned about the amount of work that goes into planning, organizing and actually conducting my own research. I am thankful for this opportunity to work with such intelligent professors and peers developing these types of skills in my undergraduate career. I would like to thank the Office of Undergraduate Research for making my research a reality with this opportunity. I would also like to thank Dr. Lamya Karim, Dr. Vijaya Chalivendra, Dr. Jun Li and David Okide for all the help and guidance carrying out this project.

Zachery Herrera.

Research in Fine Arts

Picturing the Defiance of Street Vendors Against the Rise of Industrialization and Corporatization in the Philippines

By Bhen Alan


Portrait of Bhen Alan at work in the Philippines

I am a Senior Art and Design Major with a Painting concentration in the College of Visual and Performing Arts at UMass Dartmouth. My passion for painting is not just for aesthetic reasons. I want to use art to give a voice to the voiceless. I also want to address current socio-political events. Last spring I was a recipient of a (2018) summer stipend from the Office of Undergraduate Research. The goal of the research was to create a body of work about the rising tension between different classes due to rapid corporatization and industrialization in the Philippines. This topic has become a politicized issue since I moved away from the Philippines. Until I was a teenager, I lived in the Philippines and then moved to Canada before settling in the United States. I feel fortunate, because immigration has given me the opportunity to skip the economic crisis that has affected my hometown. However, the culture of the people who make a living in the Philippines is something that I have always loved and respected.

I conducted my research in Tuguegarao City, located in the province of Cagayan. The region is a 12-hour-drive from Manila. This is the city where I was born and raised by my grandmother who is a vendor. Although, Tuguegarao City is not a big municipality in terms of geographical area, the rise of industrialization, corporatization, and globalization is affecting its economy. During the administration of the former mayor, Delfin Ting in 2011, he re-built the old public market in downtown Tuguegarao. He named it the “Mall of the Valley.” This establishment was meant to organize all of Tuguegarao City’s street vendors. It was meant to provide protection and to fix the problem of traffic congestion. Unfortunately, in order for the street vendors to have access to a retail space in the building they had to pay a monthly retail space, provide a business permit, and register at the Bureau of Internal Revenue (BIR) for business taxes. However, the street vendors who sell seafood, meat, produce, flowers, and other goods are incapable of paying these high taxes. Moreover, they cannot afford to own a retail space. For these reasons, street vendors still gather on the sidewalks of the streets of Tuguegarao City. As a result, most retail spaces in the “Mall of the Valley” are now abandoned, and street congestion still remains a big issue because of this situation.


Street vendors flock beside the Mall of the Valley building


As of 2017, large mall operators have emerged throughout the city proper. SM Supermalls and Robinsons Malls, which are the largest malls in the Philippines and Southeast Asia have also entered Tuguegarao City’s territory. The rise of corporatization, industrialization, and globalization in the city is very important for the economy because the city is becoming the center for commerce, industry and service for the Cagayanos. Globalization and industrialization is largely a good thing since it lifts both actual and imaginary boundaries. It brings us closer to each other. However, globalization also makes it hard for a culture to maintain its identity. So, how does a culture maintain its identity while keeping up with the advancement of the modern world?

Robinsons Place Mall under construction for a 60,000 sq. m. floor area making the biggest mall in Tuguegarao City


That is the question I kept asking during the course of my painting research, which involved ethnographic work. The body of work I produced focuses on the city’s lively and energetic streets because of hardworking locals who work from dusk to dawn to bring liveliness and dynamism to the city. My paintings showcase the street vendors who sell their locally grown goods, thus competing with the rise of globalization and corporatization in Tuguegarao City. The local vendors are able to maintain our tradition and practices through local marketing while the city is able to keep up with the modern advancements. The duality our city is offering is very important for the economy. Despite this idyllic description, Tuguegarao faces many multi-dimensional challenges of poverty. During my first excursion to the public market, I unexpectedly met Elsid Natividad who is a Capitol officer who gives “arkabala” or a cash ticket that serves as a market fee to the street vendors. Since a new mayor, Jefferson Soriano, is now running the city, one of his policies is allowing vendors to sell their goods and products in certain areas. They do not need to have a business permit or apply to the Bureau of Internal Revenue, they just need to clean up their spaces at the end of the day and pay “arkabala” which costs 10 pesos or .20 cents (USD). This serves as their daily tax for using a 1×1 meter space. The tax goes to the government for public funds. If they exceed a 1×1 meter retail space, their “arkabala” will be doubled or tripled. Unfortunately, since large malls and big supermarkets are  competition, some street vendors are unable to pay the market fee because of lack of customers. Their last resort is to pack up their products and leave the space before the officer gives them a ticket. But some street vendors are also successful as the informal sector of the society.

Cash Ticket or Arkabala serves as the daily taxes of street vendors. It cost 10 Philippine pesos of .20 cents U.S. dollars


Products like garments, accessories, and even appliances may not sell well in the streets, but any kind of edible material is a big hit. Filipino customers bargain their prices to get a product cheaper, which is why they prefer to buy their meat, seafood, and produce outside supermarkets according to Alice Rioja, a seafood vendor in the street of Tuguegarao. She proudly claimed that customers buy more of her seafood products and reject the supermarkets because of their fixed and expensive prices. In their street space, which is one of the biggest spaces in downtown, customers can bargain the prices even lower and  get the fish almost for free. The process may not look as clean as the supermarket’s but the quality of the product is the same. Filipinos generally gravitate to a greater quantity that fits the budget rather than buying expensive products that is packaged cleanly and safely yet have a smaller quantity.

Bhen Alan during a work in progress of 4×5 feet painting

Alice Rioja posing in front of her seafood products in Downtown Tuguegarao

Unlike Alice Rioja who is a successful seafood street vendor, Filomena Iquin, an 84-year-old produce vendor, struggles to sell her vegetables. By her own account, she harvests some of the vegetables in her backyard and brings them to the market to sell. She sometimes buy vegetables from another vendor then sells them at a higher price. Unfortunately, she is not always able to sell everything because of her competitors, and then she is unable to pay the market fee. She said if she couldn’t pay the market fee the day I interviewed her, she will be temporarily banned for three days to sell her products.

How can we maintain our cultural identity | oil on canvas| 4 feet by 5 feet

I also met a lone bamboo shoot (rabung) vendor who refused to give her identity. She struggles to sells her product. The drama of her posture and the colorful background against the greyness of the drugstore building is the reason why I chose to paint the scene. A family of mango vendor accepted my request to take their pictures amidst the busiest street in the Philippines, Edsa. By their own account, they are not allowed to place their cart in the streets but they have to do it to earn a living. This is a good contrast between conformity versus rebellion. I love how they bring color to the crowded and dullness of the street even though they know the consequences if they get raided.

Left image: Drugstore at Del Rosario Street. Right image: Fresh Harvest | oil on canvas | 3feet by 4 feet


Industrialization, globalization and modernization may be happening around the city but these street vendors bring visual vibrancy and maintain the cultural practice that the Filipino people has been practicing. The flow of traffic might be congested under the brisk bare light of Tuguegarao, but people are getting used to it. The government is still fixing the traffic problem as vendors are taking over some parts of the streets, but at least there is now a law that protects these vendors. Street Vending is legalized under the Executive Order 452 as part of the Social Reform Agenda of Government.

Three Umbrellas | oil on canvas | 2 feet by 3 feet

A cultural forum was held during my stay in the Philippines. It was a whole day program held in Tuguegarao City to talk about the preservation of the culture of Ybanag (people of Tuguegarao) while modernization is taking over. I was invited as a guest speaker to talk about how my paintings maintain the culture of Ybanags, how it touches industrialization, and how it promotes the Filipino culture in the United States. Other guest speakers talked about the roles of indigenous people, the significance of local cultural heritage, issues and concerns about tangible and intangible heritage, and promotion of local heritage. All the themes were very relevant to my research. The event gave me an opportunity to dig deeper in my culture. Sadly, my culture, Ybanag and Itawes, is slowly vanishing because of rapid industrialization. The cultural forum did not only give me resources to finish my research, but it also allowed me to use it as a platform to present my paintings and promote my heritage.

Left image: coordinators, guest speakers, teacher of Linao National High School after the cultural forum. Right image: Bhen Alan during his art talk about promoting culture through visual arts


My project was divided into two parts: the first part was to accomplish my research about the rising tension between classes due to industrialization, and the second was to visit local schools to introduce the exciting possibilities of contemporary arts. I chose schools that lack resources necessary to teach a hands-on based studio project. Also, because of poverty, most students do not have opportunities to see an art show or to listen to a local artist. A lot of students are really talented in art, they have potential, but being an artist in the province is not considered a serious profession.

Students of Linao National High School during their 2-day art workshop


Art offered me a platform to give students the experience and information about our cultural heritage. The Philippines is very rich in visual arts but not everyone can access it. People living in the barrio do not have a chance to experience visual arts or even use any artistic materials because of poverty. Food is prioritized over expensive art supplies. Given this, I provided all the materials needed – paints, brushes and hand stretched canvas – so that students would not spend any of their allowances. The first school that I visited was at Linao National High School in Tuguegarao City; it was my 2009 Alma Matter. Going back to conduct a workshop is my way of giving back to the school and the community. A 2-day workshop was held to grade 12 TVL (technical-vocational-livelihood) students. I chose this group because they specialize in hands-on based activities.  It was an all-day workshop from 8:00 am to 4:00 pm. During the first half of day one, a power point presentation about my life abroad, my purpose on going back to the Philippines, being a student at the University of Massachusetts Dartmouth, a slide-show of my portfolio and examples of contemporary artworks and artist were presented. Mr. Alejo Cambri, Art and Design Teacher, divided the class into 4 groups since there were 40 students. Each group had their own painting category to create: still life, plein air, silhouette painting, and illustration focusing on tropical designs about localization. The students started gathering their ideas, photographing, sketching and started painting on the second half of day one. The morning of the second day was intense because we only had the half day to finish the works. We even made it more intense when we decided to make it a competition to motivate students to take the workshop more seriously. I saw how they were collaborating to mix colors, they were helping each other to render shapes and forms and to finish their projects. It was challenging for them because it was their first time using acrylic paint on a canvas. It was also their first time to collaborate. I had to roam around the room and help each one with how to apply paints; some students have their own techniques and styles, but others did not know the proper use of the materials. It was challenging but rewarding when we finished the projects. A fun program was made as we concluded the workshop. I provided snacks to the kids and we set up the room as if it was a gallery. We invited teachers to judge the paintings, the principal and the head teacher were also present, and other students were also invited to observe the program and they interviewed me for their school paper. My objective for the closing program was to teach students how to critic: how to present their artworks and critic their peers in basic yet artistic and an academic way. Each group had a representative to present their artworks as the judges and other students gave their insights and opinions. I also displayed my paintings beside the students’ outputs. I had the chance to present my research and answer a few questions about it. To close the program, a certificate of participation was given to all participants, a certificate of recognition and a print of my artworks were given to the winners, and a certificate of appreciation was given to Mr. Alejo Cambri and to all judges. Their final paintings went on display throughout the campus to serve as public art.


Plein Air group and Still-Life group with their final paintings

Tropical Illustration group and Silhouette group with their final paintings


The second school that I visited is Cagayan National High School in Tuguegarao City. There were 61 art and design students who participated. Unfortunately, I ran out of funds to provide materials but the art and design department helped me. We created a simplified self-portrait using black and white acrylic paint. I was inspired by my design class projects and decided to pass the knowledge onto the students. My objective in this workshop was to teach them how to control their use of shading and gradation. Also I aimed to introduce portraiture on a simplified form where details aren’t the important part of the portrait but the general shape and plane are what  makes a portrait sophisticated. Also to show them a different approach to teaching art and to reciprocate our knowledge with each other. A certificate of appreciation was given to me by the department during the closing program.

Cagayan National High School Students during their art workshop working on a simplified self-portrait


Subsequently, I traveled a 12-hour-bus ride from Tuguegarao City to Manila, then a 2-hour-plane ride from Manila to Tagbilaran, Bohol where the third school that I visited is located. Another 4-hour-bus ride from Tagbilaran to Talibon City was needed to reach the school San Isidro Elementary School. My colleagues and I decided to visit this school because of their lack of art classes and poverty. They were very hospitable despite their poverty. We coordinated with Ms. Frozen Abedejos, a grade 4 teacher to accomplish the workshop. She gathered 20 students from kindergarten to grade 6 to participate in the program. Later on, most of the population of the school joined us to experience our watercolor lesson. I decided to teach watercolor to the students because they did not know what the material was; they had not touched a watercolor set before. My objective for this workshop was to introduce the possibilities of the medium and let students experience the watercolor itself. There weren’t any rules that they needed to follow, I just showed a few techniques and let them enjoy the workshop. Later, I learned that the schools wanted to join an art contest. So I taught the competitors the proper use of watercolor; the techniques and styles that can be used to prepare the students for the competition were employed. Because of poverty, an outreach program was also made for the kids. Since we do not have enough fund to provide school supplies, we solicited Procter and Gamble employees in Manila. We bought papers, notebooks and pencils to give to the students. They thought they had to pay for these materials, but when their teacher explained that it was a donation, they were all excited and grateful.

Students of San Isidro Elementary School during their watercolor workshop


During the process of my research, I was invited for a solo art exhibition that took place in conjunction with the celebration of Aggao Nac Cagayan, the annual province’s festival. Since there are no galleries in the Tuguegarao City, it was held in a mall; at SM Tuguegarao Downtown. It was ironic how my paintings dealt with the rise of the corporatization, and then they were exhibited at one of the largest malls in the Philippines. However, the exhibition gave me the opportunity to display and talk about my artworks to a larger audience – to show the millennial audiences how this culture is battling for its sense of identity. The show was exhibited at the center of the mall so that everyone would see it. It was displayed for a day during the festival. I used this pop-up exhibition as a platform to interact with the people and communicate with them about the issues that I am concerned about. Most people told me that industrialization and corporatization is a good thing for the city because it provides a lot of resources for the people. They are able to use transportation that is easy to access like Uber and Grab and there are also increasing business profits that are happening in the city. I also asked people how to maintain our culture since industrialization and corporatization is rising to ensure our values, practices, heritage and sense of continuity is preserved. Most answers that I received were related to the theme of keeping customs alive and helping organizational methods that protect the culture. It was heartwarming when most people appreciated the visual presentation of the street vendors in my paintings because it is a valuable asset for the city.

Bhen Alan’s Artworks in the center of the SM mall in during a pop up exhibition


My research allowed me to explore a different style of painting. Before this research I used to paint only photo-realist works. I romanticized overly detailed paintings as I meticulously rendered every single micro detail of a subject. The paintings that produced for my research is a huge leap from photo-realism. I allowed myself to be free, loose and painterly. I show my underlying structures, my brush strokes are visible and uncontrolled. I even moved my body as I painted on a large sized canvas. These paintings are very spontaneous. This research improved my skills as an artist as well as a researcher. I am grateful to the OUR and to my advisor, Professor Suzanne Schireson, for helping me throughout the course of this research.


To learn more about my work, click on the following images to see footage made during my OUR funded fieldwork in the Philippines:


Research in History

To Counterfeit is Death: Exploring Benjamin Franklin’s Methods

By Daniel W. Everton


Portrait of Dan Everton, historian and artist

My OUR project focused on Benjamin Franklin and the methods he helped develop in the creation of anti-counterfeit measures as he and his colleagues were commissioned for printing paper money. In 2012, the Delaware County Institute of Science discovered in its collections a set of metal blocks that appeared to be used for printing currency. They approached Jessica Linker, who was working on her dissertation at the time and a long-time fellow at the Library Company of Philadelphia, who has been studying them since. Upon seeing the blocks, I immediately thought of 3D printing a copy. While I was initially going to venture off by myself to attempt to 3D print the blocks, I was approached by Jessica Linker and readily pulled into her team of undergrads to work on their Digital Scholarship Summer Fellows project from Bryn Mawr College. The Fellows are Umma Tanjuma Haque, Shuang Li, Linda Zhu, and Eleftheria Anagnostou. My focus was to learn photogrammetry from the students, assist in the project, as well as document the process through photography and film.


Figure 1 – Photo of the sage leaf block, Photo by Daniel W. Everton



What is photogrammetry? Specifically, it is the ability to take measurements from series of photographs. These measurements allow one to measure a surface. A non-profit named Cultural Heritage Imaging (CHI) trained individuals at Bryn Mawr College, in which they trained the Digital Scholarship undergraduate students how to do the process. The sage leaf block, pictured above, has a very shallow or “low” relief. The image on top of the leaves is hard to see. This proved to be the hardest thing to photogrammetry since the photographs could not provide the software enough surface points. It wasn’t until Matthew Jameson, PhD candidate in Classical Archaeology, suggested putting the leaf block at a tilted angle with the assistance of an ingenious piece of Styrofoam. After that, our team was able to successfully capture the surface points. While there were two other blocks with the sage leaf block, the sage leaf block is fundamentally the one I am most interested in as it relates to my argument which I will explain later.

Figure 2 – The sage leaf block positioned on a Styrofoam wedge, within a lightbox. Photo by Daniel W. Everton


The software we used to compile all our images and put them on the XYZ planes is Agisoft. Within Agisoft and the work between all the students, we were able to capture up over 120,000 points within 184 pictures. Pictured below shows how the pictures are “situated” in space and reflected onto the anchor which is the ball. The Fellows taught me how to use Agisoft, take the circuits of photos, and how to follow the workflow.


Figure 3 – Screenshot of Agisoft with Leaf Block photos, totaling 184 photos and 126,586 points. Screenshot taken by Digital Scholarship Students and Jessica Linker


The result of all these, leads into a stunning 3D rendering of the blocks with a successful mesh that shows the details of the sage leaves on the block.

Figure 4 – Mesh showing the detail captured through the rendering. Screenshot taken by Digital Scholarship Fellows and Jessica Linker.


Figure 5 – Final 3D render of the sage leaf block. Screenshot taken by Digital Scholarship Fellows and Jessica Linker.



As part of Bryn Mawr College Digital Scholarship Fellowship, Jessica Linker developed a project with the Library Company of Philadelphia where they would create a digital exhibit about the blocks. Using the Unity software, the rendering made in Agisoft can be put into a digital “landscape” where individuals can visit the website and explore the blocks. The mesh for the blocks will eventually be open sourced, and a 3D print of it will be attempted later.


My Argument/Thesis

While I am a Historian, I am also an artist. I fell into printmaking and printing, which are understood currently as two separate disciplines but seem to have been very enmeshed during the time of colonial printing. I argue that Benjamin Franklin and his team used printmaking methods and other very innovative technologies that I feel should classify Benjamin Franklin as an artist. I think his prints should be taken into consideration amongst fine artists, and his subsequent bills printed by himself and those within his printing company to be examples of art. To make his bills anti-counterfeit, Franklin had to innovate on current technologies and create new ones.  The colonial bills I encountered at the Library Company have utilized monotype printing, intaglio plate processes, and of course, the nature-leaf print blocks that were custom made. I hope to explore the process further in the fall, where I try to recreate the theorized methods of how the leaf blocks were made to make my own print editions.

My documentation of the project will be within a “vlogumentary”, utilizing a YouTube and traditional documentary style methodology to discuss what I learned, some history about colonial printing, and the process of photogrammetry. I hope to release it in late Summer.


Figure 4 – Two Dollar Bill for Massachusetts-Bay, March 1780, Printed by Hall and Sellers for a “Peter Boyer”. The bill uses intaglio, monotype printmaking, unique registration, and a nature/leaf print block.



A special thanks to Bryn Mawr College and their Digital Scholarship team on campus, Jessica Linker, Umma Tanjuma Haque, Shuang Li, Linda Zhu, Eleftheria Anagnostou, Matthew Jameson, Anne McShane and Jim Green and other staff at the Library Company of Philadelphia, Dr. Amy Shapiro of UMass Dartmouth, Professor Len Travers of UMass Dartmouth and Dr. Paula Rioux for igniting my love of public history again, Professor Elena Peteva for answering all my weird questions about printmaking and teaching me printmaking, and to UMass Dartmouth’s OUR Grant program and the review committee for the opportunity and their work and allowing me to do this.

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