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Do All Fast Radio Bursts Repeat?
Emily Huerta and Bing Zhang Ph.D.
Fast Radio Bursts (FRBs) are bursts of radio waves detected at great distances from space. Some FRBs are observed to repeat while some others not. One important question concerning astrophysicists today is whether all FRBs repeat. Recently, the Canadian Hydrogen Intensity Mapping Experiment (CHIME) published a master catalog of FRB detections for both repeating and non-repeating FRBs. This is the largest FRB database published to date. With the data in this catalog, we investigate whether repeaters and non-repeaters may show up as statistically different categories in certain parameter space. We focus on the FRB arrival time and fluence and study the repetition behavior in the fluence ratio vs. waiting time two-dimensional space for each pair of bursts for repeating FRBs as well the lower limits of both parameters for non-repeaters. From this graph we can determine if repeaters and non-repeaters indeed occupy different phase spaces, which can shed light on whether they have distinct origins or rather form a continuum in terms of repetition rate, i.e. the apparent non-repeaters are simply repeaters with slower repetition rates.
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Climbing the Social Ladder: Asian American Education and Social Mobility Across the United States
Syeda Jamshed and John P. Tuman Ph.D.
As the fastest-growing ethnic group in southern Nevada, Asian Americans comprise 8.6% of Nevada’s population and 10.28% of Clark County’s population. Despite the rapid growth of the Asian American community in southern Nevada, Asian Americans are constantly facing obstacles that inhibit them from moving up the socioeconomic ladder mainly due to the lack of opportunity, policies, and resources. This research paper examines whether education influences socioeconomic advancement of Asian Americans, and whether the relationship between the two variables is conditioned by other factors, including social capital. A secondary goal is to examine whether the relationship between education and social mobility varies among different sub-groups of Asian Americans, including South Asians. Lastly, the thesis offers simple, tangible solutions to these problems. The research methodology of the thesis drew on analysis of recent, empirical studies by scholars who have examined and documented the determinants and levels of socioeconomic levels and educational attainment of Asian Americans in the United States. The thesis also provides an empirical analysis that are based on data from the Asian American Survey, which is a representative sample that includes data on educational attainment, social capital, and various ethnic and immigrant groups, including different Asian American sub-groups. The main findings of the research thesis indicated that education provides critical skills for social mobility as it provides individuals more leverage in the labor market in order to earn a higher salary.
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Out of Anger and Deception: A Feminist Rhetorical Criticism of Toxic Relationships in Steven Universe
Julianna Jovillar and Emma Bloomfield Ph.D.
Although American children’s animated series, Steven Universe, is often praised for its diverse and queer representation, people often overlook that the show also portrays toxic relationships. This portrayal moves the narrative along and frames the characters as learning and growing from their traumas. In this study, I have evaluated the portrayal of the toxic and abusive relationship of Lapis Lazuli (Lapis) and Jasper in Steven Universe using feminist rhetorical criticism. Informed by rhetorical theories of gender, hierarchies, and power dynamics, my analysis shows there is an issue of consent displayed between the characters, as well as blatant physical and verbal abuse. Additionally, other characters’ comments about the relationship provide explicit acknowledgment that the relationship is harmful and abusive. Power dynamics are also apparent in the simultaneous framing of a relationship between two females and the distinctive presentation of Lapis as feminine and Jasper as masculine, which mirrors but also complicates gender roles. The results indicate that the depiction of abuse through Lapis and Jasper is nuanced and accurate, enabling Steven Universe audiences, likely children and young adults, to recognize toxic relationships that are often missing from children’s media. As children are the primary audience of this show, it is implicated that Lapis and Jasper’s portrayal acts as a lesson for younger generations, introducing them to toxic relationships early on as a way of educating them on what to identify as unhealthy and presenting them in a way that challenges traditional gender roles and power dynamics between men and women.
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Qualitative Analysis of Different Educational Physical Activity Interventions and Policies for Older Asian Americans in the United States
Raisa Kabir, Manoj Sharma, and Sayeda Tazim Zaidi
Physical activity (PA) provides numerous positive health benefits and minimizes chronic diseases and mental health issues, especially in older adults. The national survey data indicated that only 27.3% to 44.3% of older adults meet the recommended physical activity guidelines of 150 minutes/ week. There are limited data on PA behavior among older AA adults as very few to no local/national surveys are targeted for older AA and their marginalized subgroups. This qualitative analysis aimed to understand and review the effectiveness of physical activity interventions targeted for and done among older Asian American adults. The study included a comprehensive review based on publications from the last five years (2016 to 2021) which included literature on all physical activity interventions with older AA adults. Data were abstracted for study designs, associated conditions, subgroups focused, theoretical frameworks, sample sizes, intervention strategies, and physical activity outcomes. A total of nine intervention studies met the inclusion criteria based on age, ethnicity and racial group, year of publication, United States-based, and English-only publication. Four used randomized controlled designs, three used pre-test post-test designs, one used cross-sectional survey, and one used a single group repeated measures design. The studies included in this paper did not use behavioral theories and utilized small sample sizes. It is crucial to develop long-term effective interventions that will increase physical activity and decrease sedentary behaviors in older AA. To achieve such goals, there needs to be more research addressing and utilizing theory-based physical activity promotion intervention with larger sample sizes.
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Evolutionary Analysis of NLR Genes in Metrosideros through Comparative Genomics
Sarem Khilji and Elizabeth Stacy Ph.D.
Plants rely heavily on innate immunity toward pathogens due to the fact that many of them do not contain specialized adaptive immune system cells. In order to mount proper immune responses, plants must come up with several broad defense mechanisms. One such mechanism in these plants, nucleotide-binding domain & leucine-rich repeat (NLR) proteins, are key players when it comes to intracellular immune-related functions. While the biological functions and protein structure of NLR genes are similar across species, variation in NLR gene numbers and sequences among closely related plant taxa can play a key role in diversification and the evolution of reproductive isolating barriers. In this study, we examine variation in NLR genes within Hawaiian Metrosideros (Myrtaceae), an incipient adaptive radiation of woody taxa that show partial isolating barriers. By using NLR annotating software tools, examining the number of NLR genes through code, mapping these genes to their respective chromosomes, and looking at synteny between taxa, we hope to glean insight into the evolution of NLRs in Metrosideros and how variation of these NLR-mediated mechanisms may potentially confer reproductive isolation within taxa. Preliminary results suggest that pubescent Metrosideros taxa may have a greater number of NLR sequences than glabrous taxa while also varying in their distribution across chromosomes. Future synteny analysis will provide a framework for examining variation of these homologous genes and help to establish if gene order is a significant factor of NLR variation among different species.
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Development of Novel Synthetic Methods of Lysine-Specific Demethylase 1(LSD1) Inhibitors as Anti-Cancer Reagents
Citlally Lopez, Lilian Huynh, and Jun Yong Kang Ph.D.
Cancer is the malignant growth and division of abnormal cells. The proliferation of cancerous cells is harmful to the human body since it interferes with many biological processes. Lysine-specific demethylase 1(LSD1) protein levels are expressed at high levels in many types of cancers such as teratocarcinoma, embryonic carcinoma, and embryonic stem cells. Gene expression in cancerous cells can be repressed by lysine-methylation on histones which ensures the maintenance of a tightly organized histone. Targeting LSD1 protein levels can significantly impair the growth of cancer due to the methylated histones being unable to participate in gene expression. Lysine-specific demethylase 1(LSD1) inhibitors prevent the proliferation of cancer by targeting the high concentrations of lysine-specific demethylases vital for cell proliferation. CBB3001 is a LSD1 inhibitor which has been able to inhibit the growth of cancer, warranting further investigation. The aim of this research project is to synthesize CBB3001 by developing efficient synthetic methods and to then create a CBB3001 derivatization library. The researchers involved will synthesize CBB3001, a LSD1 inhibitor, by developing several synthetic pathways with variability along specific steps to produce CBB3001 derivatives. CBB3001, and its derivatives, show great promise in functioning as anti-cancer reagents for many types of human cancers.
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High Precision In-Situ Raman Spectroscopy on a Novel Room-Temperature Superconductor, Carbonaceous Sulfur Hydride, Under Pressure and Cryogenic Temperatures
Faraz Mostafaeipour, Keith V. Lawler Ph.D., and Ashkan Salamat Ph.D.
Superconductivity is an incredible quantum phenomenon that historically only occurred at low temperatures. Recently, room-temperature superconductivity was discovered and will have various benefits and advantages in application, such as revolutionizing the energy grid, making medical imaging more accessible, and solving problems in related sciences. We have experimentally investigated carbonaceous sulfur hydride (CSH), a novel room-temperature superconductor, at varying cryogenic temperatures and pressures through high precision Raman spectroscopy. The current understanding of the material lacks information about the chemical structure and stoichiometry. Investigating the temperature and pressure space of its Raman spectra will give insight on important details about its structure, chemical composition, and phase diagram while other investigative methods are not suitable. CSH was synthesized in a diamond anvil cell (DAC) and taken to 12 GPa at ambient temperature. Raman scattering data for CSH’s vibrational spectra was collected on warm up from 10K to 293K at a pressure of 28 GPa. Various thermal broadenings, a temperature induced phase transition in the lattice mode region of the spectra, and present C-H modes at low temperatures are observed.
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Spike Nozzle Design For Use In Nanosat Orbital Maneuvering
Drew Nemeth
Annular spike nozzle engines have long been the holy grail of rocket engine design, promising superior performance in a smaller footprint when compared to conventional bell nozzles. However, flaws inherent to the design of spike nozzles have prevented widespread adoption and testing. As a result, research on potential applications has been quite sparse. This project aims to further spike nozzle research by investigating rarely tested materials that literature suggests have potential for use in a spike nozzle design. The goal of the overall research project is to examine 3D printed polycarbonate component longevity under conditions representative of a small satellite in orbit. A literature review concluded that spike nozzle overheating challenges might be less relevant in situations that value availability and safety over peak efficiency. A series of computational fluid dynamic simulations were performed to compare the theoretical performance of equivalently massed 50% hydrogen peroxide catalytic aerospike and DeLaval thrusters under low Earth orbit conditions. It was found that polycarbonate aerospikes might present mass savings over conventional DeLaval nozzles in these conditions.
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Development of Experimental Rocket for Component and Payload Acceleration Load Testing
Drew Nemeth, Jake Pettitt Ph.D., and Brendan O'Toole Ph.D.
With a burgeoning commercial space industry in the United States, more reliable and cost effective methods for qualifying critical flight components are required in order to reduce the costs of spacecraft development programs. Electronic payloads designed to undergo high acceleration loading during military and civil rocket flight have proven especially difficult to properly flight test prior to operational use. This paper describes the design, construction, flight testing, and post-flight analysis of a single stage launch vehicle with an intended apogee of 50,000 feet and maximum velocity in excess of Mach 2 with a simulated electronic payload. Software suites including OpenRocket, RasAero, and AeroFinSim were utilized in order to confirm rocket stability, a projected flight outline, and structural integrity of the airframe and fin composition/attachment that commonly fail during supersonic flight regimes. The airframe was primarily constructed of G12 filament wound fiberglass tubing in addition to a composite fin can centered around CNC’d G10 fiberglass cores with a wet carbon fiber layup by hand. Flight roll control was achieved via the onboard reaction wheel, which was constructed of 3D printed components and inertial measurement sensors. The completed vehicle experienced a successful flight to 42,000 ft, maximum velocity of Mach 2.2, and maximum acceleration of 16 G. The airframe and all components were safely recovered and in working order post-flight. A successful test of the simulated electronic payload was performed and a low cost flight verification method was established.
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The Relationship Between Racial Microaggressions and Multiracial Identity Turbulence
Aimy Paulsen
Efforts to understand the development of Multiracial identity have gained traction in recent years, with studies focusing on different socialization factors to explain the common struggles that Multiracial individuals face. This online cross-sectional study sought to understand the association between microaggression experiences and Multiracial identity. I recruited 140 adults who were proficient in English and identified with two or more races to explore the relationship between racial microaggressions, challenges in Multiracial identity, and how they are racialized by others—street race. Microaggressions are subtle, ambiguous, or unintentional slights that can cause stress in marginalized individuals. For this study, Multiracial identity turbulence (MIT) is when individuals with two or more races feel indifferent, uncertain, or insecure about their racial identity. I hypothesized that MIT would positively correlate with microaggression experiences (H1) and also with observed microaggressions happening to family members (H2). It was expected that participants who indicated their street race as “White” would report less microaggressions than others (H3). Lastly, I expected that individuals who responded differently to the self-perceived race and street race measures would have higher levels of MIT (H4). Although H1 and H2 were not supported through correlational analyses, creating categorical groupings revealed a two-way interaction between identity types and street race on microaggression experiences. H3 had no significant support, but presented some interesting outcomes that deserve further exploration. These findings may promote a holistic understanding of the diverse and nuanced experiences of Multiracial individuals for families, researchers, and mental health practitioners working with this population.
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Central Americans in Las Vegas
Emily Salazar
The Las Vegas Valley has become home to a large Salvadoran and Guatemalan population with no clear understanding of the reason for its growth. Upon arrival to the United States, many Latin American immigrants will often struggle with the language barrier and the lack of resources at their disposal. This study aims to uncover what factors and advantages made the Guatemalan and Salvadoran communities choose to stay in Las Vegas Valley, as well as the contribution these populations have made to this metropolitan area. I will first examine published scholarship that uncovers the reasons on what initiatives made central Americans migrate to Las Vegas and what programs could have been used to flourish this population. I will then compare the collected scholarship to oral history interviews from the Latinx Voices of Southern Nevada to determine whether or not a similar relationship can be formed. The comparison leads to believe that many similar points were connected but there is still a disconnect with the interviews. An aspect in particular, that was not adequately addressed, is that of the subjective influence of the American Dream. Throughout the past 30 years, the Las Vegas Latin community has grown immensely and is believed to continue to expand with the ever-evolving metropolitan culture.
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Police Shootings in the Mountain West, 2015 - 2021
Elia Del Carmen Solano-Patricio
The Washington Post publishes and regularly updates a dataset regarding the use of deadly force by police since 2015. This study extracts data for five Mountain West states (Arizona, Colorado, Nevada, New Mexico, and Utah), and presents a regional perspective on the total number of individuals shot and killed by police, including demographic variables such as race, gender, and age. Two additional variables are included in this examination: the presence or absence of mental illness in the decedent, and the presence or absence of a body-worn camera in incidents of deadly police force. Collected from January 1, 2015, to March 17, 2021, these data are exclusive to deaths resulting from a police officer shooting an individual while on-duty. In-custody deaths, non-shooting deaths, and deaths occurring while an officer is off-duty are not included. Between 2015 and March 17, 2021, 808 individuals were shot and killed by police in the Mountain West. Within the region, New Mexico ranks first for police shootings per million people, followed by Arizona, Colorado, and Nevada. In all five Mountain West states, a majority (more than 95%) of individuals shot and killed by police were male, and a majority (70%) of decedents were between the ages of 18 and 44. Most fatal encounters did not involve the presence of mental illness in the decedent, nor the use of a body-worn camera on the part of the police.
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The Effect of Lanthanides on Corn Growth
Savanna Vacek
Wastewater treatment plants (WWTPs) offer a reliable source of reclaimed water for irrigation. Metal-based chemicals (i.e. coagulants) are frequently employed in wastewater treatment, and residual metal ions remain in the treated wastewater, which could result in application of these metal ions to agricultural fields and crops. This study focuses on an emerging coagulant containing lanthanum. The behavior of lanthanum reclaimed water (LaRW) towards corn growth is barely known. Thus, if we are to recycle LaRW to support corn growth, the effects of LaRW on corn growth need to be studied. Corn kernels were grown in varying lanthanum concentrations (0-5000 mg La3+/L) to establish a toxic limit of La. Upon selecting the toxic limit, corn kernels were grown with LaRW in a greenhouse setting. The production of reactive oxygen species (ROS), enzymes, proteins, and anti-ROS compounds were studied. The presence of lanthanum in water promoted biomass, radicle, and plumule growth at less than 100 mg La3+/L when compared to controls. However, increasing the concentration above 100 mg/L attenuated radicle and plumule elongation with almost no biomass development at 5000 mg/L. The decrease in radicle-plumule elongation and failure to germinate might be attributed to increased malondialdehyde and superoxide production (yet to be confirmed). The production of these compounds increases the peroxidation of polyunsaturated fatty acids, reducing seed viability. Furthermore, the superoxide scavenging enzyme is easily destroyed by O2-, reducing the growth chances of the seeds. These results provide insight into the development of LaRW guidelines to be used in corn irrigation.
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Lovingkindness Meditation Alters Sense of Self in Non-Meditators
John Watt
The COVID-19 pandemic and civil unrest have increased individuals’ stress, anxiety, and social isolation. In response, a resounding call has gone out for more resources to buffer the effects of this psychological burden. One free and accessible resource is meditation; lovingkindness meditation is particularly beneficial and increases positive emotionality, psychological well-being, prosocial behavior, and social connectedness. Meditation is theorized to confer these benefits through fostering an allocentric spatial frame of reference. An allocentric spatial frame of reference is a view of the self that extends beyond the boundary of the body and is accompanied by a heightened sense of connection to the world as a whole. While other meditations have been found to foster more allocentric spatial frames of reference, lovingkindness meditation is absent from the literature on this topic. The current study examined if a short lovingkindness meditation increases allocentric frames of reference in a sample of non-meditators. One hundred and ninety-four non-meditators took the Spatial Frame of Reference Continuum – 7 points to measure their spatial frames of reference before and after a 13-minute lovingkindness meditation. Data analysis revealed that the lovingkindness meditation had a moderate positive effect (d = 0.54) on individuals’ allocentric spatial frame of reference. Future researchers should compare the effectiveness of lovingkindness meditation with other types of meditation. A regular lovingkindness meditation practice may help individuals expand their sense of self and access positive benefits that will help them deal with the stress and anxiety of current events.
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The Gender Wage Gap as it Relates to State Partisan Control and Pay Equity Policy
Candace Wells and Kenneth Miller Ph.D.
This study offers an explanation to the interstate variation of the gender wage gap in the United States. Looking at political explanations as an answer for the wage gap’s persistence, I hypothesize that Democratically controlled state government positively impacts the state having pay equity policies, and that having these pay equity policies positively impacts the state’s gender wage gap. Using U.S. Census Bureau, National Conference of State Legislatures, and American Association of University Women with U.S. Department of Labor Women’s Bureau data, I find that while there is a correlation between Democratically controlled state legislatures and pay equity policy and a correlation between Democratic majority legislatures and a narrower gender wage gap, there does not appear to be a direct association between pay equity policy and the state’s gender wage gap. The findings suggest that partisanship of the state legislature plays a key role in the wage equity policy of a state, as well as the reasoning that longstanding Democratic majorities have already passed policy to combat the apparent causes of the gap, and that more in depth policy is thus necessary to completely close it.
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College Students' Health Insurance: A Focus on Foreign-Born Students' Healthcare
Phuong Le
This research is to explore the uninsured rates of foreign-born students from the age of 18 to 24, including those who study abroad in the United States from foreign countries, immigrants of the U.S. who are green-card holders, and residents/citizens who were not born in the U.S. It is found that there is no significant difference between Asian foreign-born students and other racial groups of foreign-born students, suggesting that there may not be a big cultural difference in perceiving health insurance among foreign-born students. In general, foreign-born students are 19.34 percentage points more likely to be uninsured. Statistical analysis has shown that there is a significant difference in uninsured rates between U.S-born and foreign-born students. Health insurance for international students is historically not as readily accessible nor has a good value. Thus, despite contributing greatly to the U.S. economy, this group of international students usually struggle when it comes to obtaining information on healthcare and utilizing the insurance plan that they are required to purchase. Due to school mandates, a large portion of foreign-born students who are international students are required to have health insurance in order to attend schools, while foreign-born undergraduate students who are not international students are not required to. In light of such differences in how health insurance is mandated on these different groups of students as well as other cultural factors that are applicable for foreign-born students in general, future research with relevant data would be helpful in identifying any health insurance disparity existing between international students and domestic students.
The Office of Undergraduate Research (OUR) provides students with the opportunity to present their research at three annual undergraduate research symposia. This collection contains student podium presentations .
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