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The Performance of Self: The Story of Cora Youngblood Corson
No full textIn the early twentieth century, the name Cora Youngblood Corson regularly appeared in newspapers and magazines around the world. She was a fixture on the concert stage and vaudeville circuits. As a euphonium and tuba player, she was praised as being one of the greats of her time. She was a woman of high class who became independently wealthy, moved in the rarified world of celebrities, and her endorsements drove sales of musical instruments. Performing in full tribal regalia as a Native American she subverted cultural stereotypes by portraying Natives as modern entertainers rather than people of the past. Crowds flocked to theaters to see this Native woman who grew up on the plains of Oklahoma perform Indian songs, opera, and jazz with skill unmatched by any other. However, Cora had no Native heritage. Cora Youngblood Corson’s life exemplifies another form of defrauding Native Americans in Oklahoma. Her ability to continually reinvented herself by manipulating racial, national, and class representations to remain unique in vaudeville highlights a seldom discussed form of representation of self
Third-party application burner phone analysis
Full text linkIn today’s day and age, how people communicate is changing. Communication is often done using cell phones, specifically among users through multiple third-party applications. Although the options available to communicate are endless, they are also becoming a very dangerous tool. A third-party communication application is an application that is downloaded by a user to communicate with friends and family or socialize, separate from the mobile device text messaging. However, third-party applications are often used in criminal activities. Users’ need for privacy also pushes manufacturers to improve and impose strong security features in their software. These improvements make forensic examinations and recovery of such data on mobile devices more difficult. This study explores the recovery of data from disposable numbers offered by the Burner application. The mobile devices utilized in the study differentiate in operating systems to compare data recovered in an Android operating system and an iOS operating system. Within the Burner Application, three lines will be used to exchange messages, photos, and videos. Data extraction and parsing will be conducted with Cellebrite UFED 4PC version 7.73.0.68 and Cellebrite Physical Analyzer Inseyets version 10.5.0.1016. The research demonstrated that the different operating systems contribute to how much data is recovered. In this study, the amount of data recovered from the Apple iPhone 15 Plus, an iOS device associated with the Burner application, was more significant than the Samsung Galaxy S23 Ultra, Android operating system. Future research should utilize various Android devices as they differ based on manufacture and service provider. Data associated with the Burner application is recoverable depending on the operating system. Using different mobile devices forensic tools could also yield different results. This research applies methods for recovering disappearing messages to recover digital artifacts created by Burner’s disposable number feature, an area not previously studied or published
Sensibly preserved: precarity and primitivism in Louis A. Allen's Time Before Morning
Full text linkThe collection of folklore, folktales, and mythology is rife with colonized Western ideas. In the 1960's Louis A. Allen began collecting Australian Indigenous Art and the stories that informed their creation. Allen was a management theorist who traveled and worked in emerging economies around the world. Allen served in WWII and lost most of his European Jewish family in the Holocaust. This thesis examines Allen's collection of Australian Aboriginal Dreamtime stories and how his experiences and his ideologies influenced his tellings, in particular his concerns about the precarity of Aboriginal culture and his Western ideas of primitivism. By examining three sections of his book, Time Before Morning, this thesis will show that while Allen had altruistic motives for his work, Western ideologies infuse his tellings and provide important insight into settler scholarly work. Louis Allen's family has extensive archival materials including his library, writings, ephemera, and collected artwork. By examining these materials, conducting interviews with several of his children, alongside a close reading of his book the themes of primitivism and precarity swiftly emerge. Australian cosmology and Dreamtime stories are unique. By drawing upon the work of Margaret Jacobs, Glenda Hambly, Adrian Newstead and Bruce Elder it is possible to briefly explore some of the complexity inherent in analyzing Dreamtime stories. Jacob's work connects Australian and Native American experiences, providing a basis from which to examine Allen's work through a USian lens. Chadwick Allen and Linda Tuhiwai Smith provide further conversation about the need to look at Indigenous research through a decolonizing lens as well as a trans-Indigenous one. Precarity is inherent in folktale collections, Donald Haase's provides great understanding about the challenges inherent in these collections and the need to acknowledge the creation of a new text. Primitivism is one of the underlying colonizing ideologies in anthropological work. By examining Richard Slotkin and Ter Ellingson's work on the Noble Savage trope, this topic is further explored in Allen's work to show how ubiquitous this ideology is. The first chapter of this project explores the nature of precarity as it was perceived by Allen and others in Australia. While Allen did not practice Judaism openly, his culture and his experiences in WWII influenced his concerns about the loss of Aboriginal culture. In the 1960s myriad scholars were concerned that modernity would eradicate much of the culture. This is present in Allen's tellings of the funeral myths that he collected and told. One myth, Muryana or Happy Spirit, was only collected by Allen along with a painting named the same. While this might prove Allen's concerns valid, there is tension in the right to collect, publish, and re-tell these stories that were not his own. The second chapter explores the theme of primitivism and how it is expressed in Allen's tellings of "Everyday Myths." These myths were selected and told in a section that purportedly tells the stories of why things are. Primitivism is a valorization of Indigenous cultures and their connections with land. Allen's sense of primitivism is present in the words and stories that he chooses. This chapter closely examines Allen's characterization of women, in particular by aligning transgressive women and the Biblical Eve, and how his insertions and cultural background reflect Western ideology. The final chapter compares three tellings of the Rainbow Serpent Myth collected and retold by Allen, Catherine Berndt, and Caroline Josephs. There are three distinct themes within the variations between these collections: incestual origin of the Wagilag sisters, the nature of the pollution of the waterhole, and the guilt and transgression of the Rainbow Serpent. A close reading of all three tellings shows that each one prioritized a different aspect of Indigenous storytelling as described by Brill de Ramirez. Berndt's collection centers the storyteller, Josephs' collection centers the reader, and Allen's collection centers the story. A close reading of these different emphases highlights a few of the myriad challenges that settler scholar collections and tellings contain. Allen did not collect and tell the Dreamtime stories for his own gain. He was methodical and careful to be accurate. Yet, Western ideologies, like primitivism and precarity, are still present in his work. This thesis shows that as scholars we must always be careful to examine the basis for our decisions. Allen's desire to share these stories with a larger culture led him to infuse the Dreamtime stories he told with Western ideas of Indigeneity. As such, this study reminds us to be careful of what and how we gift "knowledge" to cultures that are not our own
American Composer Nancy Hill Cobb: Her Story, Her Music, and Her Threnody
No full textThe music of Nancy Hill Cobb has been performed across the United States and around the world for decades, but to date, little has been written about the composer. This document contributes to knowledge in the field of choral music by recording, through first-hand accounts and additional research, the life and work of an important American composer. Interviews with Cobb provided valuable information and insight for this study, including how experiences with gender bias shaped her professional life and impacted her musical contributions. Additional information was gleaned through communication with individuals connected to Cobb, and from news stories, writings of the composer, and other publications. Cobb’s music is discussed, including her compositional influences and characteristics, and an overview of her choral catalogue is provided. Threnody, a choral-orchestral work written in response to the traumatic 1995 Oklahoma City bombing, is examined through historical precursors, including the grief journey of survivor Ernestine Hill Clark who became Threnody’s librettist. A narrative analysis is provided that may be useful to conductors of the work. Future choral scholars who perform music by Nancy Hill Cobb will have access to the information gathered in this document to inform their study. Ultimately, the document shows the importance of Nancy Hill Cobb’s contributions to the choral canon and the significance of her choral-orchestral work Threnody
COMPUTATIONAL ASSESSMENT OF KEY PROPERTIES IN CoNiRu ALLOYS USING ATOMISTIC SIMULATIONS
No full textReliable prediction of material behavior at the atomic scale is critical for the design, improvement, and development of high-performance structural alloys. Among them, the CoNiRu-based alloy has emerged as a promising candidate to many applications in aerospace, nuclear energy, and high-temperature manufacturing due to its high tolerance to mechanical loading, thermal stability, and potential for use in extreme environments. In this study, the CoNiRu ternary alloy system is systematically evaluated using atomistic simulations implemented in Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS), where a universal machine learning interatomic potential (uMLIP) model is benchmarked against density functional theory (DFT) results. The uMLIP is assessed for its ability to predict lattice parameters and elastic constants in face-centered cubic (FCC) and hexagonal close-packed (HCP) structures at 0 K and 300 K, as well as generalized stacking fault energies (GSFE) in FCC and HCP structures at 0 K. The findings of this work offer critical insight into whether uMLIP can accurately approximate key mechanical and structural properties of CoNiRu alloys when compared to DFT results. The capabilities and limitations of uMLIP for modeling multi-component alloy systems will be tested, with implications for accelerated alloy design and deployment in advanced engineering applications. Gathering atomic simulation data using uMLIP proves to be promising and resource-efficient when juxtaposed with DFT method of data collection
Protection and Safety of Small UAS in Complex Electromagnetic Environments: Modeling and Experiments
No full textThe survivability of small Unmanned Aerial Systems (sUAS) in high-intensity radio frequency (HIRF) environments is a significant characterization that determines the operability in critical environments. The existing sUAS system designs do not consider the complexity of adversary electromagnetic environments, such as Radio Frequency (RF) interference, electromagnetic interference (EMI), Counter-UAS (C-UAS) electromagnetic attack (EA), and other potential sources of noises in the radio frequency spectrum. This study aims to identify practical approaches for improving the resilience of existing small UAS against HIRF. These improvements are to be evaluated through both controlled laboratory experiments and in situ flight testing. The initial investigation of this study focuses on identifying the weak spots of the existing flight vehicles, from the propeller, motors, and controllers, as well as the internal electronics, especially the RF communication systems and power supplies. The second step emulates the HIRF environment expected in multiple domains (such as air, sea, or ground airport) in laboratory environments. A lab-based emulation test bed is introduced with higher power and better configurations than the previous work [2,3] and installed for the new emulation experiments. The third step performs careful power level calibrations and measures the effects of laboratory-produced HIRF environment on the commercial radios acquired for testing. These results are then compared to the theoretical models. The system setup and size focus on the S-band (2.4 GHz ISM band) radio links, electronic components, onboard GPS, and navigational sensors. This approach is frequency agnostic and can be applied to any radio frequencydevice. From this study, three levels of mitigation are introduced. (1) Minimal protection. (2) Shielding solution. (3) Shielding and EMI filtering solution. Laboratoryand in-situ testing provide evidence of the effectiveness of these mitigation methods in promoting the survivability and operability of sUAVs in HIRF environments near high-power radars. Meanwhile, laboratory testing generates a vendor-independent radio behavior model that may be used for prediction and comparison of radio performance in RFI/EMI/HIRF condition
INTEGRATED BIOMARKER INVENTORY REVEALS RESPONSE OF MICROBIAL COMMUNITY TO GLOBAL WARMING INDUCED WATER CHEMISTRY CHANGES IN THE BLACK SEA
No full textThe Black Sea is a site of intense scientific study because of its rich sediment archive. A semi-enclosed marginal sea, the Black Sea has undergone significant paleoceanographic changes during the late Quaternary, most notably its reconnection with the Mediterranean Sea in the early Holocene (~9,500–7,500 years ago) following the last glacial maximum (LGM). During the LGM (~26,500–19,000 years ago), global sea levels dropped by ~120 m, isolating the Black Sea as a freshwater lake until rising waters allowed Mediterranean inflow, first as a gradual incursion (~9,500 years BP) and then as a fully marine connection (~7,500 years BP), leading to the modern stratified water column with a brackish surface layer and anoxic deep waters. This transition is marked by a shift from freshwater lacustrine sediments to marine sapropelic muds, supported by microfossil evidence. The reconnection induced strong salinity-driven stratification, causing oxygen depletion in deeper waters and establishing the Black Sea’s permanently anoxic conditions, with a layered water column consisting of an oxic surface layer (0–100 m), a suboxic zone (100–150 m), and a sulfidic anoxic zone (>150 m) dominated by hydrogen sulfide (H₂S). Sedimentary records reveal redox-sensitive geochemical markers such as molybdenum (Mo) and uranium (U) enrichments, pyrite (FeS₂) formation, and high organic carbon preservation due to limited microbial degradation under anoxia. Lipid biomarkers can provide additional information about the Black Sea’s sedimentation, redox and salinity evolution history. These molecular fossils, combined with isotopic and inorganic geochemical data, reconstruct the lake-to-marine transition, euxinia onset, and anthropogenic impacts, making the Black Sea a critical natural laboratory for studying paleoenvironmental changes, redox evolution, and organic carbon burial in marginal seas. The overarching theme of this work is the application of an integrated biomarker inventory to understand the co-evolution of the planktonic microbial community and the Holocene Black Sea’s salinity and redox changes. A biomarker inventory application rather than the use of single, stand-alone biomarkers is important to capture the existing condition and response of source organisms that dwell at different depths of the water column. This approach potentially helps minimize bias that could arise from the use of single biomarker groups. The work is reported in three chapters. Chapter 1 concerns lipid inventory of targeted biomarkers to reconstruct unique responses of microorganisms dwelling at different depths of the water column. The targeted biomarkers include Chlorophyll-a degradation derivatives, (Chl-a-DDs), long-chain alkenones (LCAs), crenarchaeol, overly branched glycerol dialkyl glycerol tetraether (OB-GDGTs) and dialkyl glycerol ethers (DAGEs) which are markers of organisms that dwell at different depths from surface waters to the sea-sediment interface. The inventory reveals differences in microbial dynamics prior to marine incursion, progressive changes during the incursion and dynamics in the Late Holocene. Mediterranean incursion and the resulting stratification impacted chemocline lead to increasing dominance of photosynthesis over chemosynthesis. Euxinia developed gradually in the basin, and it has remained euxinic with the impact of Late Holocene surface freshening stimulating primary productivity but not having much effect on water column stratification. Chapter 2 focuses on characterizing the unique response of algae versus other photosynthetic organisms to salinity and redox changes. A potential proxy that can help with discriminating Isochrysidales algae from other photosynthetic sources is also discussed. Prior to the incursion, primary productivity was low and relative abundance of other phytoplanktons (proxied by chlorophyll-a-degradation derivations) to haptophytes were stable, with Chl-a-DDs/LCAs values ranging between 0.7 and 1.6. The δ¹³Corg and δ¹⁵Norg data show large variability, likely reflecting mixtures of terrestrial and aquatic organic matter. Isochrysis algae were not well adapted to increasing salinity that accompanied the Mediterranean incursion with estimated concentration dropping to lowest values as marine incursion continued. Progressive increase in TOC, positive carbon isotopic excursion and progressive increase of δ¹⁵Norg support the idea of increased primary productivity and enhanced preservation, although the increased productivity was mainly by other phytoplankton groups. There is resurgence in Isochrysis algae with Late Holocene surface water freshening. Chapter 3 details the detection and distribution of long-chain alkenones and haptophytes’ ecological dynamics and response to climate variation in Holocene. Using reversed-phase liquid chromatography electrospray ionization quadrupole time-of-flight (RPLC-ESI-qTOF-MS) LCAs with 37 to 40 carbons, with unsaturation degrees ranging from di- to tetra unsaturated as well as methyl- and ethyl-compounds were detected and quantified. Baseline resolution was achieved for C37 alkenone double bond isomers as well as distinct separation of C38Me and C38Et alkenone peaks. A novel discovery is the decrease in the abundance of tetra-unsaturated alkenones with increasing carbon chain length and the intolerance of tetra-unsaturated alkenone-producing haptophytes to elevated salinity
Improving WoFS-PHI Watch to Warning Severe Weather Guidance through new Predictor and Target Datasets
No full textWarn-on-Forecast System-Probabilistic Hazard Information (WoFS-PHI) is a real-time machine learning algorithm that predicts individual severe weather hazards (hail, wind, and tornadoes) for up to 4 hours of lead time. The original version of WoFS-PHI used predictors from WoFS and ProbSevere Version 2 (PS2) to predict local storm reports (LSRs). While previous work found WoFS-PHI to be more skillful than machine learning baseline forecasts from WoFS or PS2 individually, an open question is whether using different predictor and/or target datasets would improve the skill of WoFS-PHI. In this thesis, multiple experiments are conducted to examine the (combined and individual) influence of: ProbSevere Version 3 (PS3) and Tornado Probability Algorithm (TORP) predictors, 1-h vs. 2-h time windows, and hazard-specific warning machine learning targets. New WoFS-PHI models were trained with varying sets of predictors and target datasets. Models were verified using Brier Skill Score, performance diagrams, and attributes diagrams. Predictor importance was analyzed through relative tree interpreter and accumulated local effect curves. Results show that including PS3 and TORP in the predictors modestly improves forecast skill for all three hazards, but especially for tornadoes. Predictor importance results showed that PS3 predictors were slightly more important to WoFS-PHI than PS2, and PS3 were less important for 2- than 1-hour forecasts regardless of lead time, but WoFS predictors were more important for 2- than 1-hour forecasts. TORP had relatively minimal impacts compared to WoFS and ProbSevere due to a lack of TORP objects in the training dataset. However, when TORP objects were present, they were quite influential to forecasts of all hazards. Results showed that BSSs for WoFS-PHI models trained on warnings and LSRs were much higher than BSSs for WoFS-PHI models trained on LSRs only. This suggests that WoFS-PHI is more skillful at predicting warnings relative to warning climatology than predicting LSRs relative to LSR climatology. In other words, warnings-and-LSRs can be a more predictable target for WoFS-PHI than LSRs alone. While additionally training on warnings offers both advantages and disadvantages, overall findings here suggest that warnings should at least be considered to supplement LSRs as a target for severe weather forecasting
A Dynamic, Person-Centered Approach to Emotions in Complex Skill Learning: Antecedent and Performance Outcomes of Trajectory Profiles
No full textIn modern workplace environments where dynamic performance demands are becoming commonplace, adaptive performance is critical for employee and organization success. Although emotions and shifts in emotion are recognized as important factors that relate to task performance, there is limited understanding regarding the dynamic interplay between emotions and adaptive performance. To investigate research questions surrounding emotion-performance relationships, researchers have primarily relied on variable-centered approaches, which seek to explain the relationship between variables at a population-level (Howard & Hoffman, 2018). However, these approaches do not account for nuanced experiences of emotion and assume affect patterns that are homogeneous across the population, leading to critical oversights in the scholarly literature. This dissertation builds theory on emotion-performance relationships by utilizing person-centered approaches, which can handle heterogeneity in multiple variables simultaneously to identify clusters of individuals with shared characteristics within a population (Howard & Hoffman, 2018; Woo et al., 2018). Emotion scores were collected repeatedly from participants across two samples of college undergraduates (N1 = 303, 100% male; N2 = 615, 52% male) while they engaged with a complex video game used in prior research on skill acquisition and adaptive performance (Hardy et al., 2014, 2024; Hughes et al., 2013). Growth mixture modeling, antecedent correlate analysis, and repeated measures ANOVA were used to identify and examine (a) profiles of emotion experiences that emerged during skill acquisition and adaptive performance, (b) factors that influence profile membership, and (c) the relationship between profile membership and performance. Distinct profiles with varied emotion trajectories were identified and characterized by their experience of greater positive emotions (e.g., happy, at ease), negative emotions (e.g., angry, anxious), or deactivating emotions (e.g., bored, calm, discouraged), with profiles that reported greater positive emotions performing best and profiles that reported greater negative emotions generally performing worst. Importantly, the person-centered approach leveraged in this study revealed a substantial proportion of individuals (over 60% across samples) experienced low emotional arousal following increases in task complexity, paired with moderate performance levels in adaptation relative to other individuals—a result variable-centered approaches have not uncovered. This work challenges simplistic valence-based models of emotion and provides novel insights regarding the dynamic and nuanced role of emotions in complex, high-demand performance environments. My findings advance emotion theory in performance contexts, particularly by clarifying the role of activation potential, how emotion trajectories inform emotion-performance relationship theory, and affective differences between acquisition and adaptation
Utilizing Paleomagnetic Evidence to Constrain the Timing of Magnetization of Zebra Dolomite across the Great Basin, Nevada
No full textHydrothermal zebra dolomites are a distinct carbonate rock characterized by alternating bands of hydrothermal saddle dolomite (white) layers and darker dolomite layers, typically millimeter thicknesses. The zebra dolomites are often associated with ore mineralization, and are typically described as forming at the same time as the ore laden hydrothermal fluids migrated through the host dolomites. This study uses paleomagnetic techniques to determine if the zebra dolomites hold stable magnetizations that can be used to determine the age of the zebra dolomite formation. These hydrothermal zebra dolomites sampled for this study are hosted in carbonate rocks of Cambrian, Devonian, Mississippian, and Permian age in the eastern part of the Basin and Range Province, Nevada. Of the nine sample locations, six contained characteristic remanent magnetizations (ChRMs) that are interpreted as CRMs held in magnetite based on unblocking temperatures from 360-580ºC. One site had visible reddening, and its ChRM had unblocking temperatures in the range of 540-660 ºC, indicative of maghemite. Twelve CRMs were observed in zebra dolomites across sample localities (some sites held multiple ChRMs). Ten of the twelve CRMs plot on the North American Polar Wander Path (APWP). The CRMs vary in age from Silurian to Jurassic. These multiple ages of magnetization acquisitions reflect the complex tectonic history of Nevada. More sampling of the unaltered non-zebra host rock is needed to determine if these CRMs are localized within the zebra or more widespread. The CRMs are interpreted to date differing fluid pulse conduits over multiple orogenic events throughout the Paleozoic