Digital Commons Network^™

Development Of An Improved Mathematical Representation Which Captures The Nonlinear Dynamic Behavior Of A Drill-String Assembly, Eleazar Marquez

Mechanical Engineering Faculty Publications

In this study, an improved mathematical representation of a drill-string assembly is developed to provide an alternative assessment on vibration irregularities proliferating downhole due to bit-rock interference. Lateral vibrations receive particular attention due to their high frequency content which alter the dynamic response of the drill-string, instigate casing damage, and impede optimal penetration rates. The response of the drill-string is captured by synthesizing compatible stationary bit excitations, via an auto-regressive digital filter, and implementing Monte Carlo simulation, while the power spectral density function is approximated to elucidate the dynamic characteristics during drilling. Formulating adequate physical parameters for the equation of …

A Probabilistic Analysis In Vibration-Assisted Drilling To Measure Dynamic Behavior During Drilling And Understand Risk Factors, Eleazar Marquez, Samuel Garcia

Mechanical Engineering Faculty Publications

In this paper, a mathematical representation is proposed to further understand the dynamic behavior and risk factors associated with vibration-assisted drilling (VAD) technology. The proposed Timoshenko beam model, which characterizes VAD technology, consists of two passive, counter-rotating coaxial rotors operating simultaneously, subjected to a stochastic excitation. In this regard, a finite element technique was incorporated to determine the physical parameters of the governing equation of motion, where the shear and rotary effects, as well as the gyroscopic couples generated perpendicular to the axis of rotation, were accounted for. Further, the relative velocity between the coaxial rotors was accounted in the …

2023-February-08-Rotation Spotlight Jonathan Holan Diabetes Focus, Bill Gatton College Of Pharmacy, East Tennessee State University, University Marketing And Communication, East Tennessee State University

ETSU News

Meet P4 Jonathan Holan, from Morristown, Tennessee, and hear more about his rotation experience at Johnson City Internal Medicine with his preceptor, Dr. Rick Hess, Pharmacy Practice faculty member who specializes in diabetes care.

What did your day look like on rotation?

JH: We would typically arrive at the clinic early in the morning, as patients are scheduled starting at 8: AM. Prior to patient encounters, we work up the patient we are about to see, which involves performing a deep dive into their profiles and pulling out relevant information. From recent lab and physical exam findings to their current …

Westerners Hung Out To Dry: A Review Of The Prior Appropriation Doctrine Amidst A Drying Climate And A Patchwork Of Water Claims, Madelyn M. Vandorpe

Villanova Environmental Law Journal (1991 - )

No abstract provided.

Association Between Feelings Of Trust And Security With Subjective Health Among Mexican Migrants In The New York City Area, Pablo Gaitán-Rossi, Mireya Vilar-Compte, Isabel Ferré-Eguiluz, Luis Ortiz, Erika Garcia

Department of Public Health Scholarship and Creative Works

The size of the foreign-born population living in the United States makes migrants’ health a substantive policy issue. The health status of Mexican immigrants might be affected by the level of social capital and the social context, including the rhetoric around immigration. We hypothesize that a diminished perception of trust and safety in the community has a negative impact on self-reported health. In a cross-sectional study, we conducted a survey among 266 Mexican Immigrants in the New York City Area who used the Mexican Consulate between May and June 2019 for regular services provided to documented and undocumented immigrants. A …

Museums And The Metaverse: Emerging Technologies To Promote Inclusivity And Engagement, James Hutson, Piper Hutson

Faculty Scholarship

Over the past two decades, museums have increasingly sought to build connections with the community and increase inclusivity of visitors. At the same time, emerging technologies, such as extended reality (XR) and virtual museums (VM) are increasingly adopted to engage with different generational expectations but also for the purposes of supporting inclusivity and neurodiverse populations. First such technologies were adopted to augment exhibitions in the physical museum space for edutainment. Since then, XR has expanded from room-size environments (CAVEs) and augmented exhibitions to the creation of entire virtual museums, such as The Museum of Pure Form and The Virtual Museum …

Preoperative Opioid Education, Hunter Tinnell

Group: Samford University Moffett & Sanders School of Nursing

Opioids are powerful analgesics, typically reserved for severe pain, such as intraoperative and postoperative pain. They are a valuable asset in pain control but have significant risk for addiction and abuse. Most patients are not educated on the risks, benefits, and alternatives to opioids and the majority of patients report never having a discussion regarding opioids with any healthcare provider prior to surgery. Often, patients are initially introduced to opioids for surgical and postoperative pain control. Unfortunately, this can lead to opioid abuse and addiction.

A 55-year-old female with right hip pain presented for a total hip arthroplasty. Risks and …

Factors Influencing Dietetic Interns' Dietary Habits During Supervised Practice, Courtney Weese, Katie M. Thompson, Adalyn White, Brianne Oronoz, Karli Breinholt, Dawson V. Croxall, Kelzie Devitt, Marin Easton, Madison L. Gunter, Breann Mcfarlane, Kaitlyn Reich, Jenna Sacks, Lacie Peterson, Rebecca Charlton, Holly Hopkins, Katie N. Kraus

Nutrition, Dietetics, and Food Science Student Research

Supervised practice is a prerequisite to becoming a registered dietitian. Research suggests that environmental and social factors may affect dietary choices. This focus group research aimed to gather opinions from dietetic interns to understand what factors related to supervised practice, if any, affected their dietary habits. Qualitative data were collected via seven recorded virtual focus groups in which trained moderators facilitated a discussion using a series of controlled questions. Participants, dietetic interns (n = 42) who were currently completing or had completed their supervised practice within the previous six months, attended one of seven virtual focus groups. Each focus …

Winonan, Winona State University

The Winonan - 2020s

This issue of the Winonan was published on February 8, 2023.

Neutrino Forces In Neutrino Backgrounds, Mitrajyoti Ghosh, Yuval Grossman, Walter Tangarife, Xun-Jie Xu, Bingrong Yu

Physics: Faculty Publications and Other Works

The Standard Model predicts a long-range force, proportional to G² F /r⁵, between fermions due to the exchange of a pair of neutrinos. This quantum force is feeble and has not been observed yet. In this paper, we compute this force in the presence of neutrino backgrounds, both for isotropic and directional background neutrinos. We find that for the case of directional background the force can have a 1/r dependence and it can be significantly enhanced compared to the vacuum case. In particular, background effects caused by reactor, solar, and supernova neutrinos enhance the force by many …

I'Ll Make A Man Out Of You: Precarious Manhood Beliefs Among Heterosexual-Cisgender Men And Queer Men, Serena L. Wasilewski

USF Tampa Graduate Theses and Dissertations

Traditional masculine gender stereotypes often suggest that men should be strong, assertive, and athletic, and these stereotypes promote men’s dominance in society and gender inequality. Endorsement of masculine stereotypes may also contribute to heterosexual men being more prejudiced against queer men. Queer men experience unique difficulties in their quest to abide by social norms defining manhood. Research using the precarious manhood theory suggests that manhood is difficult to obtain and even more challenging to maintain. Given the emerging nature of precarious manhood studies, little is known about young men’s perceptions of the precarious nature of manhood and how this may …

Study Of The Graphene Energy Absorbing Layer And The Viscosity Of Sodium Alginate In Laser-Induced- Forward-Transfer (Lift) Bioprinting, Shuqi Zhou, Jianzhi Li, Ben Xu

Manufacturing & Industrial Engineering Faculty Publications

Laser induced forward transfer (LIFT) bioprinting has been viewed as a new and actively developed three-dimensional bioprinting technology due to its high accuracy and good cell viability. The printing quality is highly dependent on the jet formation and its stability in the LIFT bioprinting process. The objective of this study is to investigate the effect of a graphene Energy Absorbing Layer (EAL) and alginate hydrogel (SA) (w.t. 1% and 2%) viscosity on jet generation in the LIFT bioprinting process. Since SA exhibits a shear-thinning behavior, it is a non-Newtonian fluid. The effect of EAL thickness and SA’s viscosity were addressed …

Spectrum, Volume 50, Issue 2, Sacred Heart University

Newspapers (Obelisk & Spectrum)

Highlights include: The Power of an Empty Canvas: On Feb. 2, the Narrative Art Exhibition opened -- Community Theater Welcoming Christopher Grundy -- Remembering Dr. Martin Luther King Jr -- Calling All Future RSAs: Applications Open Now! -- Todd Gibbs: Engaging Alumni -- From the Theater to the Red Carpet: nominees for the 95th Oscar Awards Ceremony -- Women Behind the Scenes: National Women in Sports Day -- SHU Cheerleading wins their fourth consecutive title in the Open All-Girl Game Day division -- Legendary SHU fencing alumni Khristopher White hired to be the new coach.

Formulation Of Encapsulated Nanoparticles Of Leek Extract As Antimicrobial And Anticancer Agent, Rawan Hassan Mohamed Elghanam

Theses and Dissertations

Leek extract (LEK) has broad therapeutic activity. However, plant extract use has many drawbacks, which could be resolved using nanocarriers. The purpose of this research work was to prepare chitosan nanoparticles (CS NPs) encapsulating LEK and investigate their antioxidant, antimicrobial, and anticancer activity. Gas chromatography-mass spectroscopy was used to determine the LEK components. The CS-LEK NPs were produced by tripolyphosphate (TPP) crosslinking with chitosan (CS) the ionic gelation methodology. The particle size was 331 nm, zeta potential (ZP) was 28.9 mv, polydispersity index (PDI) was 0.4, encapsulation efficiency (EE) was 65.6%, and loading capacity (LC) was 28.8 % of the …

Milk Diets, Grape Cures, And Bananas Galore: An Examination Of Past And Present Wellness Culture Turned Sour, Jacqueline Alnes

Sustainability Research & Practice Seminar Presentations

Professor Jacqueline Alnes, English - Milk Diets, Grape Cures, and Bananas Galore: An Examination of Past and Present Wellness Culture Turned Sour

2023-02-08 Referee: Valuing Community And A Human Connection In An Increasingly Digital World, George Burquest

The Spectator Online

No abstract provided.

Estimation Of The Response, Power Spectra, And Whirling Patterns Generated From Mud Circulating Along The Annulus During Drilling Procedures: An Alternative Mathematical Representation Via Finite Element Modelling, Eleazar Marquez

Mechanical Engineering Faculty Publications

In this study, an alternative mathematical representation of a drill-string is proposed to provide an alternative assessment on BHA dynamic alterations. Lateral vibrations remain the focal point of drill-string breakdowns given their high frequency characterization and ability to deviate perforation trajectories from the subsurface target. In this paper, the proposed model consists of an anisotropic rotor subjected to distinct RPMs, an axial force, and a bidirectional harmonic excitation with specified amplitude and assorted duration to simulate annulus motion generated from the mud fluid. In this regard, Euler-Bernoulli beam theory was adopted to establish a complete MDOF mathematical expression and thus …

Quadcopter Control Using Single Network Adaptive Critics, Alberto Velazquez, Lei Xu, Tohid Sardarmehni

Mechanical Engineering Faculty Publications

In this paper, optimal tracking control is found for an inputaffine nonlinear quadcopter using Single Network Adaptive Critics (SNAC). The quadcopter dynamics consists of twelve states and four controls. The states are defined using two related reference frames: the earth frame, which describes the position and angles, and the body frame, which describes the linear and angular velocities. The quadcopter has six outputs and four controls, so it is an underactuated nonlinear system. The optimal control for the system is derived by solving a discrete-time recursive Hamilton-Jacobi-Bellman equation using a linear in-parameter neural network. The neural network is trained to …

Coral Gardens Reef, Belize: An Acropora Spp. Refugium Under Threat In A Warming World, Lisa Greer, H. Allen Curran, Karl Wirth, Robert Humston, Ginny Johnson, Lauren Mcmanus, Candice Stefanic, Tara Clark, Halard Lescinsky, Kirah Forman-Castillo

Geosciences: Faculty Publications

Live coral cover has declined precipitously on Caribbean reefs in recent decades. Acropora cervicornis coral has been particularly decimated, and few Western Atlantic Acropora spp. refugia remain. Coral Gardens, Belize, was identified in 2020 as a long-term refugium for this species. This study assesses changes in live A. cervicornis coral abundance over time at Coral Gardens to monitor the stability of A. cervicornis corals, and to explore potential threats to this important refugium. Live coral cover was documented annually from 2012– 2019 along five permanent transects. In situ sea-surface temperature data were collected at Coral Gardens throughout the study period …

Library Services, Information Resources Availability And Perceived Academic Achievement Of Physically Challenged Students In Ibadan Oyo State, Adedoyin Johnson, Sophia Vivian Adeyeye Phd

Library Philosophy and Practice (e-journal)

Physically challenged students are entitled to all the support necessary to succeed in their academic pursuits. However, the reality in developing countries, particularly Nigeria, is that little attention is often paid to physically challenged students. This study examined the influence of information resources and library services provision on the perceived academic achievement of physically challenged students in Ibadan, Oyo State, Nigeria. The study adopted a quantitative survey research method. A structured questionnaire was adopted as the instrument for data collection. The study population comprises of 348 physically challenged students from Cheshire Special School Ijokodo, Ibadan, Oyo State. Total enumeration was …

Robust Explicit Estimation Of The Log-Logistic Distribution With Applications, Zhuanzhuan Ma, Min Wang, Chanseok Park

School of Mathematical & Statistical Sciences Faculty Publications

The parameters of the log-logistic distribution are generally estimated based on classical methods such as maximum likelihood estimation, whereas these methods usually result in severe biased estimates when the data contain outliers. In this paper, we consider several alternative estimators, which not only have closed-form expressions, but also are quite robust to a certain level of data contamination. We investigate the robustness property of each estimator in terms of the breakdown point. The finite sample performance and effectiveness of these estimators are evaluated through Monte Carlo simulations and a real-data application. Numerical results demonstrate that the proposed estimators perform favorably …

Risk Factors For Ebola Virus Persistence In Semen Of Survivors In Liberia, Romeo Orone, Edna Freeman, Giovanni Giah, Henry D Tony, Mylene Faikai, Mary Jawara, Kuku Kamara, Samuel Kamara, Benjamin Flowers, Mohammed L Kromah, Rodel Desamu-Thorpe, James Graziano, Shelley Brown, Maria E Morales-Betoulle, Deborah L Cannon, Kaihong Su, Susanne L Linderman, Mateusz Plucinski, Eric Rogier, Richard S Bradbury, W Evan Secor, Katherine E Bowden, Christi Phillips, Mary N Carrington, Yeon-Hwa Park, Maureen P Martin, Maria Del Pilar Aguinaga, Robert Mushi, Dana L Haberling, Elizabeth D Ervin, John D Klena, Moses Massaquoi, Tolbert Nyenswah, Stuart T Nichol, David E Chiriboga, Desmond E Williams, Steven H Hinrichs, Rafi Ahmed, Benjamin T Vonhm, Pierre E Rollin, Lawrence J Purpura, Mary J Choi

Faculty, Staff and Student Publications

BACKGROUND: Long-term persistence of Ebola virus (EBOV) in immunologically privileged sites has been implicated in recent outbreaks of Ebola virus disease (EVD) in Guinea and the Democratic Republic of Congo. This study was designed to understand how the acute course of EVD, convalescence, and host immune and genetic factors may play a role in prolonged viral persistence in semen.

METHODS: A cohort of 131 male EVD survivors in Liberia were enrolled in a case-case study. "Early clearers" were defined as those with 2 consecutive negative EBOV semen test results by real-time reverse-transcription polymerase chain reaction (rRT-PCR) ≥2 weeks apart within …

2023-02-08 Time Out Session: Miguel Rosario Sets Records In Collegiate Debut, Tyra Okuda

The Spectator Online

No abstract provided.

Sunrise Haiku Project: Learning To Trust, Diana Lynn Tigerlily

Artizein: Arts and Teaching Journal

Born and raised in Illinois, I moved to the ocean during a major life transition, leaving behind the familiar: family, forest, and soil. This essay incorporates reflection, photographs, and haiku to represent sixteen months of journeying to the ocean sunrise everyday. The daily practice yielded unexpected insights, moments of deep healing, and growth. The biggest lesson for me was that no matter how thick the clouds and how strong my doubt, the sun will still rise. By witnessing the phenomenon of the sun rising everyday, I have been able to rise up through layers of self-doubt and grief, and begin …

A Daycare Artist Residency In Minusio: Aesthetic Eunuciations In Borderspaces, R. Michael Michael Fisher

Artizein: Arts and Teaching Journal

This is a compilation of happenings from an artist residency at an urban core daycare and kindergarten site from July-December, 2021. The artist provides some notes on how to approach a residency, create site-specific art and work with the children, their teachers, care staff and the community surrounding the site. A newly coined concept of minusio, emerged over time and served as an invisible basis for art-care, in a sense the mirror(ing) of the gift of nurturing but also the lack of care—and offering a route to what human’s really desire, when they are not so busy and distracted …

Rooms That Awaken Us: A Poetic Inquiry Of Multiple Selves, Rawda Harb

Artizein: Arts and Teaching Journal

Using poetry as a research method, the author wrote for self-expression, self-discovery and self-healing during the pandemic. As she wrote, she realized that she is a different person in different settings with differ- ent people. Without intending to ever share this work, she then examines her multiple selves’ learning-teach- ing dance with life using literature by Aoki, Leggo, Dewey, Tajfel and others. She even discusses the notion of multiple selves in life with her young children and is fascinated by their artistic response.

Becoming An Artist: Embodying Emergent Art Making Practices, Kate L. Wurtzel

Artizein: Arts and Teaching Journal

Absract: Written in layers, this creative essay invites the reader to consider the relationship between one’s own becoming and emergent practices in the teaching and making of art. Weaving between a discussion on the theoretical concept of becoming and emergence, along with a personal narrative presented with images, the author tries to demonstrate what emergence might feel like in the body while creating alongside-and-with her own child. From points of disruption to points of harmonizing with material and material bodies, this essay examines emergence through the lens of an embodied relationality and offers up potential ways to experience such practices.

Studio As Collage: Familiar And Strange, Alison Shields

Artizein: Arts and Teaching Journal

In this visual essay, I present an artistic inquiry I created as I examine the studio as a space to dwell, a space to daydream and a prompt for the imagination. I draw from previous research about artist studios and a visual archive created of objects within the studio as I re-imagine the studio as a collage; it is a place filled with odd juxtapositions of images, artworks, ideas and space that may produce new connections and imaginings. Through presenting the studio as both subject and process, I encourage readers to embrace the strangeness within familiar places.

Silent Interruptions: Democratizing Academic Discourse Through Wordless Narrative Research, Jeff Horwat

Artizein: Arts and Teaching Journal

Emerging in the early twentieth century, wordless novels portrayed stories of working-class laborers, immigrants, and other marginalized groups overlooked and silenced by industrialization. Wordless novels visually operationalize their silence by presenting their narratives without words to call attention to hidden struggles of different social groups exploited under capitalism, colonialism, and other forms of systemic violence. This paper explores how the generative power of visual silence forces a pause in hegemonic discourses to create space for reflection and social change. Drawing from the collectivist ethos of wordless novels, wordless narrative research is introduced as a method of creative inquiry to study, …

Data’S Entanglements: Artmaking As Corresponding Companion During Diffractive Analysis, Kelly Clark/Keefe

Artizein: Arts and Teaching Journal

This essay invites readers into two creative correspondences that emerged during the author’s involvement in a participatory arts-based research project called Life Lines. The Life Lines project aimed at engaging a small group of young adults alongside researchers in their use of multimodal arts practices to inquire into what makes young adult identity work work the way that it does. In Life Lines the phenomenon of identity and the approaches to inquiry used to explore it were conceptualized through a material feminist framework that proposes the co-constituting nature of meaning and matter (i.e., bodies, atmospheres, and objects of …