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Between Cocama and Modernity in the Ucamara (Peruvian Amazon)
Get PDFCombining a contemporary ethnographic perspective with a review of historical records, the article extends Peter Gow’s re-reading of the ex-Cocama phenomenon in the Western Amazon. It argues that the foundation of the Amazonian Peruvian town of Requena at the beginning of the 20th century took place during an important historical moment in the region. Within the post-rubber boom context, schools became a particularly important idiom that enabled Requena’s growth as the centre of education and modernity. The paper investigates relations between the widespread desire for education in the Ucamara region, and Cocama descendants’ and other “ribereño” ex-Mainas peoples’ specific notions of towns, identity, descent, and social aspirations
Electrospinsters Final Project Report
Get PDFAn electrospinning machine (EM) produces fibers and particles by means of applying a voltage process (electrohydrodynamic phenomena) to a polymer solution by incorporating the use of a receptacle, a pump, a high voltage power supply (HVPS) and a collector.
EMs are typically very expensive, however, there has been work conducted by various researchers to construct in-house machines at a much lower cost. The growing applications for electrospinning continue to be a source of interest for many researchers as it is still a relatively new process. Much of the effort has been dedicated to producing nanofibers with unique properties with a focus on improving the efficiency and scalability of the process.
The Electrospinsters Senior Design Team are researching and designing an in-house EM that can produce nanofibers for the team sponsor’s research and serve other educational purposes at Trinity University. The sponsor, Dr. Dany Munoz-Pinto, intends to use the results of this project to expand his research projects and goals by incorporating nanofibers into tissue scaffolds. The prototype must be a functioning EM so that a future team or the sponsor’s research students can make additions, but not struggle with the basic functions to create nanofibers.
Based on published literature and additional research conducted by the team, we determined that an EM is composed of four subsystems: a syringe pump, a HVPS, a collector, and a user interface. The HVPS provides a voltage to the solution in the syringe pump which when exuded is drawn to the grounded collector due to the difference in electric potential. This drawn-out solution conglomerates on the collector which forms the scaffold. Published literature allowed us to gain a better understanding of the setup and we learned that there is not much variation in how the EM can be modified. Consequently, we chose to follow a fundamental setup with a flat collector plate due to its easy construction and compatibility with producing non-woven nanofibers with polyvinyl alcohol (PVA).
We designed and conducted a series of tests to validate the subsystems of the device and to test the EM against various design constraints and project requirements. Some of our constraints pertained to time and budget and our project met both of these, as we successfully created a working prototype for our sponsor by the end of the 2023 spring semester, and we only used 1200 budget. Other criteria related to health and safety were met, since we complied with TU Environmental Health and Safety and OSHA standards, the voltage applied to the solution did not exceed 30 kV at any point during testing and application, and our device fit dimensional constraints and was only operated in a CSI fume hood to prevent the inhalation of nanoparticles. Our prototype operates all electrical subsystems using US standard outlets. Certain requirements correlated with certain subsystems which had specific tests designed to evaluate the flow rate, voltage, voltage display, and nanofiber diameter. The Flow Rate Variability Test evaluated the syringe pump subsystem with variable flow rates of 0.5 mL/hr, 1.0 mL/hr, and 1.5 mL/hr and deemed accurate enough for testing purposes. The Voltage Variability Test tested the active voltage of the HVPS and verified its operation is within a ±5% margin of error. The Proof-of-Concept Test verified that the EM could produce non-woven nanofibers of 200 nm and that it is within ±20% error of previously published experiments, which are acceptable results for our sponsor’s research purposes. Additionally, we tested Tip Diameter Variability and Collection Distance Variability to observe the effects on the nanofiber diameter and determined that there is not a significant difference as they are still within ±20% error, as we had expected from published literature.
Overall, the Electrospinsters created a successful, working prototype to aid in our sponsor’s research. Our prototype met all requirements and constraints, and there are no remaining changes needed to achieve our final goals. However, for further improvements, we hope that a future team will improve this final prototype by integrating another type of collector that can produce aligned nanofibers while maintaining the ability to interchange collector types and implementing any other useful additions or modifications
The Importance of Recruitment and Retention in Heliophysics: It\u27s Not Just a Pipeline Problem
Get PDFA major obstacle in cultivating a robust Heliophysics (and broader scientific) community is the lack of diversity throughout science, technology, engineering, and mathematics (STEM) fields. For many years, this has been understood as a “leaky pipeline” analogy, in which predominately minority students initially interested in STEM gradually fall (or are pushed) out of the field on their way to a scientific research position. However, this ignores critical structural and policy issues which drive even later career Ph.D.s out of a career in Heliophysics. We identify here several systemic problems that inhibit many from participating fully in the Heliophysics community, including soft money pressure, lack of accessibility and equity, power imbalances, lack of accountability, friction in collaboration, and difficulties in forming mentorship bonds. We present several recommendations to empower research-supporting organizations to help create a culture of inclusion, openness, and innovative science
Archivos: Antonio Fernandez Spencer
No full textLos Archivos de Literatura Dominicana ofrecen publicaciones monográficas sobre los principales autores del país dominicano. En esta edición tenemos al poeta y ensayista Antonio Fernández Spencer (1922-1995), una de los modernizadores de la lírica en esa media isla caribeña. La obra ha sido editada por Carlos X. Ardavín Trabanco, reconocido ensayista y académico de orígenes domínico-cubano, actualmente profesor en en la Universidad de Trinity, San Antonio, Tejas.https://digitalcommons.trinity.edu/mono/1186/thumbnail.jp
Where Did All This STEM From?: Investigating the Support of STEM Fields for High School Girls in the 2010s
Get PDFLate Jurassic Paleogeography of the U.S. Cordillera from Detrital Zircon Age and Hafnium Analysis of the Galice Formation, Klamath Mountains, Oregon and California, USA
Get PDFThe Upper Jurassic Galice Formation, a metasedimentary unit in the Western Klamath Mountains, formed within an intra-arc basin prior to and during the Nevadan orogeny. New detrital zircon U-Pb age analyses (N = 11; n = 2792) yield maximum depositional ages (MDA) ranging from ca. 160 Ma to 151 Ma, which span Oxfordian to Kimmeridgian time and overlap Nevadan contractional deformation that began by ca. 157 Ma. Zircon ages indicate a significant North American continental provenance component that is consistent with tectonic models placing the Western Klamath terrane on the continental margin in Late Jurassic time. Hf isotopic analysis of Mesozoic detrital zircon (n = 603) from Galice samples reveals wide-ranging εHf values for Jurassic and Triassic grains, many of which cannot be explained by a proximal source in the Klamath Mountains, thus indicating a complex provenance. New U-Pb ages and Hf data from Jurassic plutons within the Klamath Mountains match some of the Galice Formation detrital zircon, but these data cannot account for the most non-radiogenic Jurassic detrital grains. In fact, the in situ Cordilleran arc record does not provide a clear match for the wide-ranging isotopic signature of Triassic and Jurassic grains. When compiled, Galice samples indicate sources in the Sierra Nevada pre-batholithic framework and retroarc region, older Klamath terranes, and possibly overlap strata from the Blue Mountains and the Insular superterrane. Detrital zircon age spectra from strata of the Upper Jurassic Great Valley Group and Mariposa Formation contain similar age modes, which suggests shared sediment sources. Inferred Galice provenance within the Klamath Mountains and more distal sources suggest that the Galice basin received siliciclastic turbidites fed by rivers that traversed the Klamath-Sierran arc from headwaters in the retroarc region. Thus, the Galice Formation contains a record of active Jurassic magmatism in the continental arc, with significant detrital input from continental sediment sources within and east of the active arc. These westward-flowing river systems remained active throughout the shift in Cordilleran arc tectonics from a transtensional system to the Nevadan contractional system, which is characterized by sediment sourced in uplifts within and east of the arc and the thrusting of older Galice sediments beneath older Klamath terranes to the east
Supporting Neurodivergent Talent: ADHD, Autism, and Dyslexia in Physics and Space Sciences
Get PDFDiversity, equity, inclusion, and belonging efforts must include disability and neurodivergence. While there is a long history of famous scientists being identified or speculatively indicated to be neurodivergent, identification on an individual basis has been limited until fairly recently. Definitions have changed and broadened, and people are being identified or are identifying themselves as neurodivergent and are learning about their paths and their brains in a way that was unavailable to people two decades ago. In the contemporary physics or space science classroom or workplace, we have both a responsibility to include and support our neurodivergent learners and scientists, as well as an opportunity to use insights from the neurodiversity movement to better support our teams and students. Herein we explain the language used to describe neurodivergent traits and offer strategies and ideas to support our neurodivergent community members. These strategies include ideas for supporting executive function as well as tips in the areas of physical comfort and sensory considerations
The Gender of Greek Suicide: Constructions of Humor and Heroism in Epigrams
Get PDFIn this thesis, I explore how epigram authors evoke and manipulate gendered modes of dying in their portrayals of suicide. More specifically, I examine how the sword/noose, male/female paradigm underlies their constructions of heroic and humorous suicides. Ultimately, I argue that the epigrams use gender-transgressive modes of self-killing to create their heroic and humorous suicide. This argument not only illuminates how epigrams played with a popular theme from ‘high’ literature but also the very telling ways that suicide was gendered in the Greek imagination
It Was My Story to Tell and I Wasn\u27t Ready to Tell It : Stigma Management Amongst LGBTQ+ Sport Officials
Get PDFThe erasure of marginalized people, especially LGBTQ+ people, is commonplace in sport. As sport has become more commercialized, even at grassroots and youth levels), one group that has become even further marginalized and dehumanized are sports officials. Understanding the intersection of marginalized identities is important; as such, this study examined how homophobia and transphobia interplay with the sports officiating profession. Semistructured interviews with 16 self-identified LGBTQ+ referees revealed a series of organizational and social factors that led officials to either pass as non-LGBTQ+ or to come out as LGBTQ+, leading to the development of the LGBTQ+ Referee Identity Management Process Model. Implications for better supporting LGBTQ+ officials to promote higher levels of retention and career satisfaction are presented