Digital Commons Network^™

On-Orbit Data And Validation Of Astra's Ace Electric Propulsion System, Matthew Gill, Rafael Martinez, Alex Zannos, Todd Bailey, Michael Cassidy, Jim Cooney, Alex Crawford, Jason Cuadra, Jorge Delgado, Jon Fuller, Maureen Haverty, Mark Hopkins, Edward Keyes, Lauren Lee, Dean Massey, Kevin Mcclellan, Jamillah Pittman, Michael Schmidt, Dhaval Shiyani, Todd Sorel

Small Satellite Conference

The first ACE propulsion system reached orbit on July 1^st 2021 as part of Spaceflight’s demonstration of the Sherpa-LTE all-electric Orbital Transfer Vehicle (OTV). We are now able to share on-orbit data and have successfully verified the on-orbit performance of the ACE propulsion system, using xenon propellent. The mission objective was to lower altitude and use on-orbit data to derive performance, correlating the propulsion system’s performance to ground test data. The demonstration consisted of activating the propulsion system for 5- minute durations at a total input power of 340 W into the Power Processing Unit (PPU). Altitude change and …

Mission Engineering And The Cubesat System Reference Model - Status #2, David Kaslow, Alejandro Levi, Bradley Ayres, David Hurst, Chuck Croney, Philip T. Cahill, Steven A. Maclaird

Small Satellite Conference

The International Council on Systems Engineering (INCOSE) Space System Working Group (SSWG) has created the CubeSat System Reference Model™ (CSRM™) intended for use by system architects and engineers as a starting point to develop the physical architecture of the Space and Ground segments of the CubeSat mission of interest to them. The CSRM is based on Model-Based System Engineering (MBSE) principles, is System Modeling Language™ (SysML™) v1.7 compliant, and hosted in a graphical modeling tool. The CSRM has been submitted to the Object Management Group (OMG) and is in the finalization process to become an OMG Specification.

With the development …

Advanced Smallsat Thermal Analysis Using Reduced-Order Models, Jacob Moulton, Derek Hengeveld, Jamie Eyre

Small Satellite Conference

High-power Small Satellites (SmallSats) have the potential to provide new and advanced capabilities for missions beyond low Earth orbit; however, certain challenges prevent wide-spread use. Of these, thermal management of high-heat loads is significant. Therefore, efficient, and effective thermal modeling and analysis methods are becoming increasingly more important, as reliable predictions of thermal behavior in SmallSat components and systems can significantly drive key design and mission-operation parameters. Thermal modeling and analysis efforts have traditionally relied on computer simulations that are often complex and computationally expensive. When properly developed, reduced-order models (ROMs) can overcome these challenges by providing a computationally efficient …

Architecture Of High Power Nanosatellites, Boris Yendler, Andrew Kalman

Small Satellite Conference

Current CubeSat architecture has been developed “ad hoc” throughout multiple years with main goals of creating mechanically stable, sufficiently lightweight and low-cost structure. From their conception up to the current times, thermal issues in CubeSats have been of little concern due to relatively low power consumption. Typically, to accommodate a considerable number of different components in a CubeSat, the components are mounted on brackets. The brackets are connected to external panels which radiate waste heat into space. This heat path, from a component to a radiator, typically has a high thermal resistance which worsens the thermal performance of the satellite. …

The Mini Astrophysical Mev Background Observatory (Mambo): A Cubesat Mission For Gamma-Ray Astronomy, Peter F. Bloser, Markus P. Hehlen, W. Thomas Vestrand, Kim Katko, Lucas Parker, Darrel Beckman, James Sedillo, Justin Mcglown

Small Satellite Conference

No abstract provided.

Nea Mini Hdrm For Low Load Applications - Development And Qualification, Ruben Betancourt, Jason Nave

Small Satellite Conference

EBAD’s NEA® Mini hold-down and release mechanism (HDRM) was designed for lower load applications, such as those found in small satellite applications. The design was born from the popularity of small, inexpensive Nichrome burn wire solutions in the Small Satellite community, coupled with some associated failures of those devices that revealed the opportunity for a more reliable solution. EBAD adapted our GEO NEA® battery bypass switch into an HDRM for small sat applications, built and tested an initial prototype. These devices have the advantages of being small, light, low power, low shock, and high reliability. The prototype effort was conducted …

Simplifying Thermal Analysis For Space, Laura Gonzalez, David Criado Pernía

Small Satellite Conference

In space, satellites are subject to an extreme environment. However, their subsystems are designed to operate within a limited range of temperatures, so pre-emptive thermal analyses avoid their malfunctioning and failure. Regarding CubeSats, a significant number of missions neglected thermal analysis in the early days. Nonetheless, in recent years, nanosatellites have experienced a continuous increase in both mass and power, evincing a crucial need for thermal management.

Radian is a thermal analysis software conceived to provide agility to engineers, both at modelling and computing processes. Our software is accessible through a regular web browser and counts on a scalable network …

Wings Of Change: A Visual And Cultural Analysis Of Mujer Angel, Taylor Carrico

The Compass

In the middle of the twentieth century, Mexico sought to reestablish its national identity. Following on the heels of the Mexican Revolution, an extended period of social upheaval and regional conflicts that transformed the country, artists and visionaries alike struggled to determine how the reborn nation would distinguish itself. While many movements in this period looked towards the future and sought utopia, there was one which concentrated instead on exploring the precolonial past and distilling the essence of “Mexicanity'' from there. This movement was known as the Mexicanidad in Spanish; or, in the precolonial Nahuatl language, the Mexicayotl. In …

Make Pennsylvania Free Again, Margaret Riley

The Compass

The author created this paper for a class assignment testing students’ knowledge of constitutional law. The assignment was to write a legal brief addressing the constitutionality of a statewide mask mandate during the COVID-19 pandemic. COVID-19 is an airborne disease that can be transmitted from person to person up to six feet apart. The hypothetical facts provided for this brief were that a suit was filed in Pennsylvania state court by a group of individuals in opposition to the state’s mask mandate that was enacted to address the COVID-19 pandemic. The goal of this brief is to demonstrate knowledge of …

Cottagecore And Rural Gentrification, Zoe Johnston

The Compass

The internet has become filled with images of stone cottages covered in ivy, sepia-tinted tea parties abundant with home-baked pastries, women in peasant dresses trailing their fingers across tall grasses, and flower bouquets set into mason jars. Each of these scenes is categorized under the aesthetic of “cottagecore,” which is growing in popularity. This aesthetic movement draws upon people’s desires for simplicity and a nostalgia for a pre-industrial lifestyle. However, an unexamined consequence of this idyllic fantasy is the subsequent gentrification of rural communities. Gentrification is the process of funneling capital into low-income neighborhoods to make them more attractive to …

The Compass, Issue 9

The Compass

No abstract provided.

A Custom Rideshare Payload Adapter For Greenhouse Gas Monitoring Microsatellites Launched In Tandem, Kevin Guan, Eric Van Velzen

Small Satellite Conference

The steep rise in the effects of climate change has opened new opportunities in space-based monitoring of greenhouse gases (GHG). The Space Flight Laboratory (SFL) is currently developing GHGSat-C3/C4/C5, a group of three Earth observation microsatellites to increase the GHGSat constellation’s emissions monitoring capabilities. Each microsatellite is deployed into orbit with the XPOD Delta, a spacecraft dispenser developed at SFL. This paper outlines the design of an XPOD Adapter for Launch in Tandem (XALT) to mount three GHGSat satellites on a SpaceX Rideshare launch. The driving requirements are presented along with XALT’s key design features, including provisions for ground support …

On-Orbit Characterization Of A Microelectromechanical Systems (Mems) Deformable Mirror (Dm) On The Deformable Mirror Demonstration Mission (Demi) Cubesat, Sophia Vlahakis

Small Satellite Conference

The Deformable Mirror Demonstration Mission (DeMi) CubeSat operated from July 2020 to March 2022 and demonstrated the successful operation of a Microelectromechanical Systems (MEMS) Deformable Mirror (DM) on orbit for the first time. The payload design is an adaptive optics system with a 140-actuator MEMS DM from the Boston Micromachines Corporation (BMC) and a Shack-Hartmann wavefront sensor (SHWFS). DMs can correct wavefront errors from a variety of sources to improve image quality. MEMS DMs are particularly well suited for space systems because they are compact low power devices and have a high density of actuators with a large stroke to …

Recovery Of A Lost Satellite: The Armadillo Mission, Dillan Mcdonald

Small Satellite Conference

After 949 days in space, contact with the ARMADILLO CubeSat from the University of Texas at Austin has been established. After a complete reconstruction of the ground command software, the Space System Design Laboratory (SSDL) at Georgia Tech has commanded and received acknowledgements and data downlinks from ARMADILLO as well as commanded a hard reset. The Georgia Tech Ground Station Network (GT GSN) has leveraged its autonomous contact capability to maintain consistent contact with ARMADILLO, enabling it to remain online for longer than a week. Something ARMADILLO had previously never accomplished due to the ground contact condition for onboard reset …

Attitude Determination With Self-Inspection Cameras Repurposed As Earth Horizon Sensors, Atilla Saadat

Small Satellite Conference

Attitude determination for small satellites is a vital aspect of spacecraft operations. Earth Horizon Sensor(s) (EHS) are one of many sensors used in on-orbit attitude estimation. A conventional EHS captures infrared images of the Earth’s horizon and estimates the nadir vector in the spacecraft body frame, using the Earth’s curvature and prior knowledge of the spacecraft’s orbit. However, the design and test of new sensors increase mission cost and development time, while some spacecraft may not be able to accommodate such dedicated sensors. Therefore, it is beneficial if existing onboard optical sensors could be repurposed as effective EHS. The Space …

Empirical Methods For Reaction Wheel Micro-Vibration Verification In A Production Environment, Sobia Nadeem

Small Satellite Conference

There is great interest in high precision attitude control of satellites, in particular for missions that operate payloads with stringent pointing requirements. Reaction Wheels (RW) are an integral part of a satellite's Attitude Determination and Control System (ADCS). However, a drawback of using RWs is that due to imperfections such as rotor imbalance and bearing defects, RWs are a source of micro-vibration. These phenomena can lead to internal disturbances which in turn may lead to degraded mission performance.

Quantifying the micro-vibration generated by RWs is a critical and time intensive process. A two-step process to verify and characterize RW micro-vibration …

Implementation And Characterization Of Commercial Off-The-Shelf Inertial Measurement Units For The Attitude Determination System Of The Move-Iii Cubesat, Natalia Piotrowski

Small Satellite Conference

This paper determines a suitable Inertial Measurement Unit (IMU) for the Attitude Determination and Control System (ADCS) of the third satellite generation of the Munich Orbital Verification Experiment (MOVE). The ADCS is required to provide an attitude determination with an accuracy of < 1°, which has to be achieved with both IMUs and sun sensors, at a low price, due to a low financial budget. In the context of this work, the three IMUs the BNO055, ICM20948 and LSM9DS1 are selected and analyzed. Additionally, the LIS3MDL magnetometer and the BMI088 gyroscope are used for further analysis and comparison. The error coefficients of each sensor measurement are initially calculated through the Allan variance, and these are then verified through Welch’s power spectral density estimate, simulations, and additional sensor measurements. Further temperature experiments are performed to characterize the behaviour of the sensor under changing temperatures. Evaluating the most accurate error coefficients found the BNO055 gyroscope to be the least affected by the white noise compared to the remaining gyroscopes. The LSM9DS1 appears to be the sensor least influenced by the random walk and white noise term among the magnetometers. The BNO055 magnetometer is the comparatively least affected by temperature changes, while the BMI088 appears the most stable amongst the gyroscopes. Finally, the BNO055 IMU is recommended to the ADCS of the MOVE-III CubeSat. It appeared to be the least influenced by different error sources and the ambient temperature.

Model-Based Development Of Multirotor Uav Power Profiles For Performance Investigation Of Different Flight Missions, Mika Suwe, Anna De Groot, Martje Forner, Claudia Werner

Journal of Aviation Technology and Engineering

In this study, a model is developed for a comparative assessment of three flight missions of multirotor unmanned aerial vehicles (UAVs) based on their power profiles in order to identify future technical research priorities and possible improvements in operational management. The model describes the missions (transport, facade inspection, drone show) based on the maneuver-specific parameters for hovering flight, vertical flight, and horizontal flight and calculates the respective power profiles of the missions based on the input parameters of a reference UAV with a battery-powered electric motor. The power profiles of the investigated missions show that the maximum powers occur during …

Saudi Heart Association Position Statement On The Use Of Biomarkers For The Management Of Heart Failure And Acute Coronary Syndrome, Waleed Alhabeeb, Adel Abdulkader Tash, Fawaz Almutari, Kamal Al Ghalayini, Maryam Alqaseer, Mostafa Alshamiri, Suleiman Kharabsheh, Wail Alkashkari

Journal of the Saudi Heart Association

Background: The burden of acute coronary syndrome (ACS) and heart failure (HF) remains high in Saudi Arabia. Biomarkers can greatly improve the management and outcomes of these conditions, but no official guidance is available on their use in Saudi Arabia. Consensus panel: An expert panel of cardiologists, interventional cardiologists and cardiac surgeon reviewed available evidence and formulated recommendations relevant to clinical practice in Saudi Arabia. Consensus findings: high-sensitivity cardiac troponins play a major role in the diagnosis of ACS and the exclusion of myocardial infarction in patients with HF. Natriuretic Peptides are recommended to determine the likelihood of a diagnosis …

College Athletics And The Exploitation Of The Black Body, Nathan Wiggins

M.A. in Higher Education Leadership: Action Research Projects

The Black body has gone through different forms of exploitation in the United States in the centuries since the first enslaved Africans were brought to this land. Although chattel slavery has long been “abolished,” it has taken a new form in college athletics. While most scholarship college football and basketball players are Black and produce millions of dollars of revenue for large and small universities, the players are not compensated and did not see a dime of it come to them. When I say that college athletics is a modern form of slavery, one might find that statement confusing because …

Captivity In Melville, Oscar Sacriste

Theses and Dissertations

ABSTRACT

Captivity in Melville (August 2022) Oscar Sacriste Jr, B.S., Southwestern Assembly of God University;

Chair of Committee: Dr. Nathaniel R. Racine

Initially, Melville’s works seem romantic and adventurous, and some may even argue that they are autobiographical. However, he also covers a wide range of serious subjects, including religion, philosophy, and socioeconomic issues. As such, Melville engages with a range of issues and conveys a deeper meaning through his writings, often through the use of allegory. This thesis examines Melville’s works through the lens of allegorical reasoning by also considering the numerous biblical allusions, which Melville employs throughout his …

Jcctl Mailer - August 10, 2022, Josef Brandauer

JCCTL Mailers

Updates on training and support and useful pedagogical resources compiled and sent by the JCCTL on August 10, 2022.

Contents:

Upcoming Events:

• 30 minutes with Kelli Murphy – Effective and Efficient Moodle Course Design Strategies
• Supporting International and Multilingual Student Writers
• Practical Ideas for Creating Effective Syllabi
• Trauma-Informed Approaches in Teaching

Other Recommended Resources:

• Creating Videos from PowerPoint
• Panopto Video Tutorials

Bacterial Diseases Of Tilapia, Their Zoonotic Potential And Risk Of Antimicrobial Resistance, Olga L. M. Haenen, Ha Thanh Dong, Truong Dinh Hoai, Margaret Crumlish, Iddya Karunasagar, Timothy Barkham, Swaine L. Chen, Ruth Zadoks, Andreas Kiermeier, Bing Wang, Esther Garrido Gamarro, Masami Takeuchi, Mohammad Noor Amal Azma, Belén Fouz, Southeast Asian Fisheries Development Center, Zeng Wei Wei, Melba G. Bondad-Reantaso

School of Natural Resources: Faculty Publications

Tilapia culture is an important source of income and nutrition to many rural families. Since 2000, the production of tilapia increased and reached domestic and global markets. Major farmed species is Nile tilapia (Oreochromis niloticus), in earthen ponds and cage cultures. Intensification contributed to global tilapia disease outbreaks, with bacterial infections causing mortalities and morbidities, threatening sustainable production. At tilapia farms, high nutrient concentrations, water temperature and fish densities enhance bacterial growth including virulent bacterial clones and potential zoonotic bacteria. Global warming favours this. This review respectively provides a comprehensive overview of the most common and emerging bacterial …

Heart Failure, Molly Davis

Nursing Student Class Projects (Formerly MSN)

Heart Failure is defined as the pathophysiologic condition in which the heart is unable to generate an adequate cardiac output such that perfusion of tissues or increased diastolic filling pressure of the left ventricle, or both occurs (Huether & McCance, 2019).

A Growth Model For Understanding Female-Owned Enterprises, Oyedele Ogundana, Amon Simba, Leo-Paul Dana, Eric W. Liguori

Rohrer College of Business Departmental Research

Numerous policy initiatives designed to support the growth of female-owned enterprises in the developing economies have repeatedly failed to achieve their objectives. Research recognizes the lack of contextualized growth models for defining female-owned enterprises in such contexts as the main issue. Thus, and drawing from our qualitative data, we propose a growth model to account for the business development activities of female-owned enterprises from a developing economy perspective. Through analyzing our qualitative data, it emerged that money (access and utilization), management (nonformal education and experience), and market (customer intelligence) were direct determinants of the growth trajectories of female-owned enterprises. Motherhood …

Restorative Justice In A Co-Ed Greek-Letter Organization, Olivia Wurzbach

M.A. in Higher Education Leadership: Action Research Projects

The purpose of my action research was to examine the impact of using restorative justice practices with members of my past co-ed Greek-letter organization. My participants were alumni of the co-ed Greek-letter organization that were active members between the years of 2011-2015. I met with my participants individually and taught them about restorative justice practices. I then facilitated a series of community building circles with my participants where we reflected on our time as active members of the organization and explored how being members of the organization has impacted who we are today. We collaborated on creating ideas for community …

We Are ... Marshall, August 10, 2022, Office Of Marshall University Communications

We Are ... Marshall: the Newsletter for Marshall University 1999-2023

No abstract provided.

Meeting Minutes 08-10-2022, Staff Advisory Council

Staff Advisory Council Meeting Documents

No abstract provided.

Meeting Minutes 08-10-2022, Staff Advisory Council

Staff Advisory Council Meeting Documents

No abstract provided.

Analysis Of Select Dietary Supplement Products Marketed To Support Or Boost The Immune System, Cindy Crawford, Bharathi Avula, Andrea T. Lindsey, Abraham Walter

Faculty and Student Publications

Importance: Cold, flu, and immunity dietary supplement product sales have skyrocketed since the start of the COVID-19 pandemic. Supporting or boosting the immune system has become an important reason for using dietary supplements, and many consumers are purchasing products through online platforms. Objectives: To examine whether select dietary supplement products advertised as supporting or boosting the immune system are accurately labeled according to the Supplement Facts label of listed ingredients and to qualitatively describe the product labels' characteristics in terms of claims made. Design, Setting, and Participants: In this case series, 30 featured immune health dietary supplements were selected and …