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Rheological analysis of crosslinking behaviors of polysiloxanes catalyzed by Karstedt's catalyst
No full textPresented to the 24th Undergraduate Research and Creative Activity Forum (URCAF) held in Woolsey Hall, Wichita State University, April 25, 2025.Pre-ceramic polymers, notably, polysiloxanes, etc., are ideal materials for complex 3D- printed ceramic materials structures, via a direct ink writing process, followed by curing and pyrolysis. The resulting silicon carbides and silicon oxycarbides with precisely engineered architectures have abroad engineering applications, because of their extraordinary mechanical and physical properties. To achieve high quality ceramic structures, proper curing of pre-ceramic polymers is crucial, aiming at the highest possible crosslinking density. In the meantime, a mild crosslinking process with uniform crosslinking and absence of cracking is preferred. To achieve these objectives, the crosslinking characteristics of polysiloxanes need to be well understood for finding the desirable curing conditions. In this study, parallel plate rheometer was used to study crosslinking behaviors of polysiloxanes catalyzed by Karstedt's catalyst. The changes of viscoelastic properties upon crosslinking were analyzed to uncover the time and temperature characteristics of such crosslinking processes. The characteristic crosslinking temperature, i.e. the temperature for the fastest property changes, is determined
Shocker Pride honorees, 2025
No full text(2025 Shocker Pride honorees): Amber Anderson, Online and Adult Learning, Academic Affairs -- Susan Castro, Department of Philosophy, Fairmount College of Liberal Arts and Sciences -- Stephanie Cockrell, Graduate Programs in Business, W. Frank Barton School of Business -- BreAnn Gilkey, School of Social Work, Fairmount College of Liberal Arts and Sciences -- John Hammond, Department of Mathematics, Statistics and Physics, Fairmount College of Liberal Arts and Sciences -- Sharmon Holcomb, Office of the Registrar, Academic Affairs -- Christopher Leonard, Counseling and Psychological Services, Student Affairs -- Susan McCoy, Department of Chemistry and Biochemistry, Fairmount College of Liberal Arts and Sciences -- (Recipient gallery
Health and wage disparities in the us technology sector
No full textThesis (M.A.)-- Wichita State University, College of Liberal Arts and Sciences, Dept. of SociologyWith a focus on gender and race/ethnicity, the study investigates wage and health disparities in jobs typical of the US high-tech industry. Utilizing data from the 2024 Annual Social and Economic Supplement (ASEC), the analysis focuses on individuals aged 20-65 employed in IT-related occupations. Controlling for age, education, marital status, and citizenship, the analysis finds a substantial gender wage gap, with women earning on average $22,867.43 less than men. Racial and ethnic disparities are also evident, with non-Hispanic Asian workers earning the most and non-Hispanic Black workers the least. The study also explored health status among tech employees—an area often overlooked in existing literature. The analysis found statistically significant differences in general health status by race/ethnicity
Leveraging diffusion and Flow Matching Models for demographic bias mitigation of facial attribute classifiers
No full textClick on the DOI link to access this article at the publishers website (may not be free).Published research highlights the presence of demographic bias in automated facial attribute classification algorithms, notably impacting women and individuals with darker skin tones. Proposed bias mitigation techniques are not generalizable, need demographic annotations, are application-specific, and often obtain fairness by reducing overall classification accuracy. In response to these challenges, this paper proposes a novel bias mitigation technique that systematically integrates diffusion and flow-matching models with a base classifier with minimal additional computational overhead. These generative models are chosen for their extreme success in capturing diverse data distributions and their inherent stochasticity. Our proposed approach augments the base classifier's accuracy across all demographic sub-groups with enhanced fairness. Further, the stochastic nature of these generative models is harnessed to quantify prediction uncertainty, allowing for test-time rejection, which further enhances fairness. Additionally, novel solvers are proposed to significantly reduce the computational overhead of generative model inference. An exhaustive evaluation carried out on facial attribute annotated datasets substantiates the efficacy of our approach in enhancing the accuracy and fairness of facial attribute classifiers by 0.5%−3% and 0.5%−5% across datasets over SOTA mitigation techniques. Thus, obtaining state-of-the-art performance. Further, our proposal does not need a demographically annotated training set and is generalizable to any downstream classification task. © 2025 Elsevier B.V.Air Force Office of Scientific Research, AFOSR; Defense University; National Science Foundation, NSF, (2129173, 13106715); National Science Foundation, NSFThis work is supported by National Science Foundation (NSF) award no. 2129173 . The research infrastructure used in this study is supported in part by grant no. 13106715 from the Defense University Research Instrumentation Program (DURIP) from the Air Force Office of Scientific Research
Selfie biometrics
No full textClick on the DOI link to access this article at the publishers website (may not be free).[No abstract available
Department of Dental Hygiene Class of 2013
No full textFirst row (left to right): Sarah Dean, SADHA President; Cortney Engels, SADHA Treasurer; Carley Chamberlain, SADHA Class Representative; Bailey Redmond, SADHA Class RepresentativeSecond row (left to right): Carissa Achey, Maegan Albert, Elizabeth Allen, Lindsey Binford, Lauren Buresh, Samantha Burke-Hull, Rose Crow, Lauren Doffing, Rebecca Farha, Samantha FontaineThird row (left to right): Alleigh Haight, Tara Johnson, Ngoc Anh Le, Melanie Martin, Monica McGehee, Summer Naab, Cristina Segovia, Desirae Shively, Megan Tessel, Alexis TrompFourth row (left to right): Megan Troyer, Brenda Velazco, Phon Viengluang, Samantha Voss, Kirsten Wald, Jordan Williams, Shana Wing, Dera WishardDigitized by University Libraries' Technical Services Institutional Repository & Digitization group.Personal and non-profit use only
Fabrication of uniform copper wick structures using High Voltage Press Sinter Method for enhanced thermal treatment
No full textPresented to the 24th Undergraduate Research and Creative Activity Forum (URCAF) held in Woolsey Hall, Wichita State University, April 25, 2025.The 21st century has seen the rise of the Urban Air Mobility (UAM) market to revolutionize and provide safe, efficient and accessible on demand air mobility systems for passengers and cargo within the urban areas which has been enabled by conventional take off and landing (CTOL) and vertical take-off and landing (VTOL) vehicles. With a global focus on the reduction of CO2 emissions, a transition from traditional combustion engine-based propulsion systems to electric and hybrid propulsion systems is being explored. The development of electric vertical take-off and landing vehicles (eVTOLs) has become a center of this revolution to provide a zero-emission based mobility. However, the success of the deployment of eVTOLs as a viable alternative to conventional transportation hinges on several technological barriers, of which efficient thermal management has been identified as the most complex challenge.
Through the development of advanced materials and innovative manufacturing technologies, this research investigates a novel high performance thermal solution leveraging uniform capillary wick structures engineered using a fast turnaround, additive manufacturing based High Voltage Press Sinter Method (PSM) using copper micropowders for creating highly porous and thermally conductive wick structures, with greater control over geometrical complexities and heat pipe designs. This method involves fabrication of three-dimensional uniform wick structures under controlled high voltage pulses, mechanical pressure and exposure times using a retrofitted capacitive discharge resistance setup. The functionality of the resulting sintered wicks is assessed based on porosity measurements, retained mass, surface wettability and surface morphology analysis via confocal imaging.
Surface morphology results reveal consistent particle sintering with maximum particle retention and robust mechanical integrity. Surface wettability and porosity testing results show optimal functional performance for capillary action. DOE-optimized sintering parameters show highly efficient and controllable fabrication technique which can be used to manufacture wick structures based on the thermal management needs
Polymeric nanoparticles enable targeted visualization of drug delivery in breast cancer
No full textThis is an open access article under the CC BY license.We report the coencapsulation of fluorocoxib Q (FQ) and chemocoxib A (CA) in micellar nanoparticles (FQ-CA-NPs) of a new PPS135-b-POEGA17 diblock polymer, which exhibited a hydrodynamic diameter of 109.2 ± 4.1 nm and a zeta potential (ζ) of −1.59 ± 0.3 mV. The uptake of FQ-CA-NPs by 4T1 mouse mammary cancer cells and intracellular cargo release were assessed by fluorescence microscopy that resulted in increased fluorescence in 4T1 cells compared to cells pretreated with celecoxib. The viability of primary human mammary epithelial cells (HMECs) or 4T1 mouse mammary carcinoma cells treated with FQ-CA-NPs were assessed, which showed decreased growth of 4T1 breast cancer cells but showed no effect on the growth of primary human mammary epithelial cells (HMECs). Intravenous dosing of FQ-CA-NPs in mice enabled ROS-induced cargo (FQ and CA) release and fluorescence activation of FQ and resulted in increased fluorescence in breast tumors compared to the tumors of animals pretreated with tempol or celecoxib, and minimum fluorescence was detected in the tumors of animals treated with nothing or empty-NPs. In addition, tumor tissues from treated animals were analyzed ex vivo by liquid chromatography-mass spectrometry (LC-MS)/MS, and identified increased levels of cargo delivery and retention in the tumor compared to tempol- or celecoxib-pretreated animal tumors. These in vivo and ex vivo results confirmed the targeted delivery of loaded NPs followed by ROS-mediated cargo release and fluorescence activation for targeted visualization of drug delivery in breast tumors and CA-induced therapeutic effect in an in vivo tumor growth inhibition assay and an ex vivo hematoxylin and eosin (H&E) staining of tumor tissues. Thus, coencapsulation of FQ and CA into polymeric micellar nanoparticles (FQ-CA-NPs) enabled their ROS-sensitive release followed by fluorescence activation and COX-2-dependent tumor targeting and retention in the visualization of CA delivery in solid breast tumors. © 2025 The Authors. Published by American Chemical Society.National Institutes of Health, NIH, (R01 CA89450, R01 CA260958-01A1); National Institutes of Health, NIH; Phi Beta Psi Sorority Trust, (AWD00000652, AWD00001248); Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, VICTR, (VR52653); Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, VICTRThis program has been financially supported by research grants from the Phi Beta Psi Sorority Trust AWD00000652 and AWD00001248 to M.J.U.; the Vanderbilt Institute for Clinical and Translational Research VR52653 to M.J.U.; and the National Institutes of Health R01 CA89450 to L.J.M., and R01 CA260958-01A1 to M.J.U., C.L.D., and R.S.C
When true love waits: Women’s memorable religious purity scripts from childhood and adolescence
No full textThesis (M.A.)-- Wichita State University, College of Liberal Arts and Sciences, Elliott School of CommunicationUsing a blended theoretical framework of the theory of memorable messages, social identity theory, and sexual script theory, this study used depth interviews with women from Christian backgrounds to explore messages of purity shared within their religious communities. Interviewees’ (n = 13) narratives were coded using iterative thematic analysis. Themes reveal that religious communities are salient sources of sexual scripts. Key findings indicate that purity scripts emphasized the value of modesty and virginity, provided essentialist perspectives on gender, restricted sex to heterosexual and monogamous marriage, and imparted rigid expectations of purity to maintain relationships. From these messages, women reported experiencing self-objectification, sexual shame and anxiety, pain disorders (e.g. dyspareunia, vaginismus), complications in consenting to sex, fear of rejection and abandonment, and complications in their religious identity. This research adds to the literature about how sexual scripts form out of memorable experiences and salient social identities and contributes to understanding the role of a religious identity in the development of the sexual self