Digital Commons Network^™

Mata-Cloud: A Cloud Detection And Dynamic Attitude Correction Evaluation Software, Vanessa Tan, Julie Ann Banatao, John Leur Labrador, Lia Cristina Mabaquiao, Floyd Ferrant Fortes, Marc Caesar Talampas

Small Satellite Conference

With the increasing demand for high-resolution images from earth observation satellites, there is a need to optimize the usability of the images being downloaded in the ground stations. Most captured satellite images are not usable for certain applications due to high cloud cover percentage. To address this problem, this research demonstrates a cloud detection and dynamic attitude correction evaluation software. This software explores two key experiments. First is evaluating different image processing and machine learning-based approaches to detect cloud cover. The cloud detection algorithms were evaluated based on their accuracy, latency, and memory consumption. The second is exploring dynamic attitude …

Northern Spirit Consortium - Canadian Collaboration Through Student-Led Cubesat Constellation, Abigail Hoover, Thomas Ganley, Charles Nokes, Katelyn Ball, Joshua Lazaruk, Callie Lissinna, Michael Lipsett, Ian R. Mann, Steven Knudsen, Duncan Elliott, Patrick Gall, Matthew Dares, Francis Reid, Brian Horton

Small Satellite Conference

The Northern Space Program for Innovative Research and Integrated Training (Northern SPIRIT) is a unique collaboration of three Canadian post-secondary institutions that will design, build, and operate a constellation of three CubeSats. The consortium, beginning in 2017, comprises Yukon University, Aurora College, and the University of Alberta (U of A). The partnership will develop three CubeSats: YukonSat (2U), AuroraSat (2U) and Ex-Alta 2 (3U) which will be launched into Low Earth Orbit in 2022. Northern SPIRIT strives to use space technology development to inspire motivated youth across Canada to engage in student-led collaboration and hands-on education, research, training, and to …

Development And Launch Of The World's First Orbital Propellant Tanker, James Bultitude, Zach Burkhardt, Maya Harris, Mark Jelderda, Srinivasan A. Suresh, Logan Fettes, Daniel Faber, Jeremy Schiel, James Cho, David Levitt, Devin Kees, Sergio Gallucci

Small Satellite Conference

This paper describes the development of Orbit Fab’s Tanker-001 Tenzing mission, the world’s first orbital propellant tanker. The development of a robust orbital propellant supply chain is critical to accelerating the growth of government and commercial space activities. The widespread availability of spacecraft refueling has the potential to provide a number of revolutionary benefits. High-value space assets could have their operational lives extended, as they would no longer be constrained by the amount of propellant stored onboard for maneuvering. On-orbit servicing missions would become more efficient, as servicing vehicles could be refueled and repeatedly used. A large orbital propellant supply …

Results From Testing Low-Cost, High-Performance Terrestrial Processors For Use In Low-Cost High-Performance Space Missions, Anita Bernie, Paul Madle, Jamie Bayley, John Paffett, Keith Ryden, Benjamin Clewer, Alex Hands, Chris Bridges

Small Satellite Conference

There has been a significant and exciting increase in the use of microsatellites and cubesats in the past decade.

However, it has proved difficult to scale up current cubesat avionics systems to enable larger, longer, more complex missions, and challenging to scale down traditional microsatellites to an affordable price point. The need exists for a system that provides the capability of a microsatellite at a cubesat cost; KISPE Space (“KISPE”) is developing the Next Generation Microsatellite Platform (“NGMP”) to address this need and is releasing the design as an open source resource via the Open Source Satellite Programme (“OSSAT”)

A …

Low-Power Boards Enabling Ml-Based Approaches To Fdir In Space-Based Applications, James Murphy, John E. Ward, Brian Mac Namee

Small Satellite Conference

Modern satellite complexity is increasing, thus requiring bespoke and expensive on-board solutions to provide a Failure Detection, Isolation and Recovery (FDIR) function. Although FDIR is vital in ensuring the safety, autonomy, and availability of satellite systems in flight, there is a clear need in the space industry for a more adaptable, scalable, and cost-effective solution. This paper explores the current state of the art for Machine Learning error detection and prognostic algorithms utilized by both the space sector and the commercial sector. Although work has previously been done in the commercial sector on error detection and prognostics, most commercial applications …

Raise-2 For Agile On-Orbit Demonstration Of Innovative Satellite Technologies: Program Strategy, Mission Definition, And Preliminary Design, Yuki Tsutsui, Kentaro Nishi, Yasuyuki Takahashi, Matsuaki Kato, Tsuyoshi Toriumi, Yutaka Kaneko, Takanori Iwata

Small Satellite Conference

The Japan Aerospace Exploration Agency (JAXA) has provided the second demonstration opportunity of the Innovative Satellite Technology Demonstration Program. In this second mission, JAXA develops the Rapid Innovative Payload Demonstration Satellite-2 (RAISE-2) that carries six components and parts as on-orbit demonstration themes. This paper presents an overview of the RAISE-2’s demonstration themes, mission definition including standard platform specifications, results of Phase-A study and preliminary design.

Janus And Lunar Trailblazer: Lockheed Martin Deep Space Smallsats For Nasa Simplex Missions, Joseph Shoer, Joshua B. Hopkins, Edward B. Bierhaus

Small Satellite Conference

NASA’s Small Innovative Missions for Planetary Exploration (SIMPLEx) program is a principal investigator-led planetary science program focusing on small spacecraft. In the SIMPLEx-2 opportunity, the cost cap for SIMPLEx missions is approximately 1/10th the cost of the next larger class of planetary exploration missions, the Discovery Program. Unlike Discovery missions, SIMPLEx missions launch as rideshare payloads with other NASA primary missions. Lockheed Martin has developed a science-capable deep space small spacecraft architecture to support two missions selected for the SIMPLEx-2 opportunity: Janus and Lunar Trailblazer. Janus is a two-spacecraft mission to fly by two different binary Near Earth Asteroids, partnered …

Design And Development Of A Ps4-Op Payload For Solar Spectral Irradiance Measurements And Technology Demonstration Of Small-Satellite Subsystems, Anant Kandala, Priyadarshnam Hari, Harsha Simha, Mallikarjun Kompella, Amal Chandran, Spencer Boyajian, Bennet Schwab, Mayuresh Sarpotdar

Small Satellite Conference

This article describes the design and development of INSPIRE-0, a payload on the spent stage of the ISROs PSLV. Recently, the Indian Space Research Organisation (ISRO) released an announcement of opportunity inviting proposals to develop payloads that can be tested on the PS4-Orbital Platform (PS4-OP). This platform is a novel idea formulated by ISRO to use the spent fourth/final stage of the Polar Satellite Launch Vehicle (PSLV), called the PS4, to conduct in-orbit scientific experiments and technology demonstration of small-satellite subsystems. INSPIRE-0 is a PS4-OP payload, jointly developed by the Laboratory for Atmospheric and Space Physics (LASP) at the University …

Smartsat Constellation - A Deep Reinforcement Learning Approach For Decentralized Coordination, Rajesh Aggarwal, Junghwan Kim, Deepanshu Agarwal, Ayushi Tiwari, James Baldo

Small Satellite Conference

With rapid advancements in satellite technology, the amount of low earth orbit satellites has grown significantly which are primarily deployed for weather monitoring, earth observation or military purposes. Due to this reason, there has been an increased interest in enhancing the level of autonomy and cognition, onboard satellites to achieve optimal data collection. Optimal data is said to be collected when the satellites in a small sat constellation work together to collect information. This means that even if one of the satellites has missed out on some important information, the others can still collect them. A satellite constellation can be …

Design Of An Imaging Payload For Earth Observation From A Nanosatellite, Elliot Saive, Liam Droog, Katelyn Ball, Jari Swanson, Elizabeth Chao, Michael G. Lipsett, Amina E. Hussein, Carlos F. Lange, Bruce F. Cockburn, Duncan G. Elliott

Small Satellite Conference

A compact imaging payload consisting of visible-near infrared and short-wave infrared capability is being developed to demonstrate low-cost wildfire monitoring among other Earth observations. Iris is a 1U multispectral push-broom imager that is capable of generating spectral data pertinent for wildfire science and wildfire risk analysis from a CubeSat platform. This payload is slated to fly on-board Ex-Alta 2, the University of Alberta’s second CubeSat and Alberta’s contribution to the Canadian CubeSat Project, to be deployed from the International Space Station in 2022. Iris features four closely integrated designs: optical, structural, electronics, and firmware. The mechanical and electronic interfaces of …

The Near-Earth Space Radiation Environment During Solar Cycle 25: Consequences For The Alabama Burst Energetics Explorer, Michael Halvorson, Tyler Tolbert, Kody Ehlers, Ross Anderson, Chris Howell, Keller Stallings

Small Satellite Conference

The Alabama Burst Energetics eXplorer (ABEX) is a 12U mission to enhance the detection of low energy Gamma Ray Burst (GRB) components and provide improved, rapid localization of short GRBs for multiwavelength follow up via GRB measurements outside the Van Allen Belts (VAB). The ABEX launch date is Q4 2024 during the peak of solar cycle 25; the ABEX science orbit is 300 km perigee by 60,000 km apogee with an inclination of 27°. This orbit defines distinct radiation environments in Low Earth Orbit, crossing the VABs, performing science operations outside the VABs, and Coronal Mass Ejection (CME) conditions. Numerical …

Lack Of Cybersecurity In The United States’ Critical Infrastructure, Dean Santos, Jonathan Kovacev, Kinsey Larson

Student Papers in Public Policy

Technology has revolutionized the nature of information, remote control, and communication itself, but it has also brought with it tangible dangers. Top minds in the United States, as well as the rest of the world, have seen those dangers and dedicated their work to mitigate them, developing the ideas and policies necessary to protect the nation from those dangers, and yet the actual implementation of safety measures within the nation lags behind.

In the meantime, as U.S. critical infrastructure remains woefully unprotected, the nation opens itself up to a plethora of cyber-attacks. These attacks can cause damage in many ways. …

The Importance Of Waste Grassland For Potential Biomass And Bio‐Energy Production In China, Liangzheng Yan, Lin Zhang, Shiqiang Wang, Xiaoyu Chen, Lin Hu

IGC Proceedings (1977-2023)

No abstract provided.

Teaching A Social Science Course On Climate Change: Suggestions For Active Learning, Leslie A. Duram

Publications

Previous research indicates the importance of interdisciplinary approaches when teaching about climate change. Specifically, social science perspectives allow students to under-stand the policy, economic, cultural, and personal influences that impact environmental change. This article describes one such college course that employed active-learning techniques. Course topics included community resilience, environmental education, historical knowledge timeline, climate justice, social vulnerability, youth action, science communication, hope versus despair, misinformation, and climate refugees. To unify these concepts, engaging activities were devel-oped that specifically address relevant individual, local, state, national, and international climate resilience themes. Students assessed their personal climate footprint, explored social/cultural influences, wrote policy …

Medical School Watercooler Newsletter - August 6, 2021, Lindsey Lyle

Watercooler Newsletter

This is the August 6, 2021 edition of the Frederick P. Whiddon College of Medicine's newsletter - Watercooler.

Contents include:

• Meet a Med Student: Tiara Dean
• Medical student aids woman in cardiac arrest
• Mark your calendar for upcoming grand rounds
• Register now: Paddle the Delta CME Conference
• USA researchers study cat flea saliva to uncover how diseases are spread
• Faculty Spotlight: Benjamin Niland, M.D.
• Neonatologist Kelechi Ikeri joins pediatrics faculty
• Save the date: OB-GYN Conference set for Oct. 14-15

Enhanced Flexible Pavement Performance Using Treated Compared To Untreated Aggregate Bases: A Comparative Case Study In The Southern United States, Mena L. Souliman, Hemant Gc, Zabi Mohammed

Civil Engineering Faculty Publications and Presentations

One of the important aspects of highway design is aggregates. Aggregates strength and consistency has an effect on pavement structure's overall performance. The consistency of the base material near the site of the construction doesn't always match the requirements of pavement construction and carrying quality aggregate raises the cost of construction. Stabilizing agents such as asphalt cement, lime, fly ash were used to improve the strength of these materials in order to make greater use of locally available materials. Layer materials present in the pavements and the structure of them influence pavement performance. The compressive strain and the tensile strain …

Spring Commencement Program, August 6, 2021, Coastal Carolina University

Commencement Programs

Program of Commencement Exercises at Coastal Carolina University.

Martensitic And Inter-Martensitic Transformations In Magnetocaloric Ni2.15mn0.85ga Heusler Alloy, A. Madiligama, P. Ari-Gur, Y, Ren, V, Shavrov, Y. Ge, J. George, I. Musabirov, V. Koledov

Mechanical and Aerospace Engineering Faculty Publications

The entropy changes of successive martensitic phase transformations in Ni-Mn-Ga Heusler alloys can be utilized to realize enhanced magnetocaloric properties. A detailed study of phase transformations of one such alloy, Ni2.15Mn0.85Ga, (ΔQ = 4900 J/kg at 343 K, under 140 kOe), is reported here. Upon cooling, the paramagnetic cubic (L21) austenitic phase transforms into a ferromagnetic 7M modulated monoclinic martensitic phase. This phase is stable in a narrow temperature range, and upon further cooling, transforms into a non-modulated ferromagnetic tetragonal (L10) phase. The separation between the equilibrium temperatures of the austenitic and tetragonal martensitic phases is only ~50 K. The …

An Analysis Of Human Gait Under Slippery Conditions Using Opensim's Musculoskeletal Simulations, Phong K. Phan

Theses and Dissertations

Computational simulations of gait under abnormal conditions provide insights into the actions of muscles, its relationships with external reaction forces and motions of the body during slips, trips, and falls - the leading causes of occupational injuries worldwide. OpenSimTM, an open-source motion simulation software, was utilized to construct musculoskeletal structures and create dynamic simulations of body movements. Gaits of eighteen subjects were studied to extract experimentally difficult-to-obtained variables under slippery conditions. The joint angles and moments of hip, knee, ankle and the forces of four prime muscle groups were analyzed for body corrective movements during slip events. Besides, the connections …

Cfd Investigation Of The Drag Effects On An Aircraft By Means Of Altering The Wing Or Canard Size And Position, Taylor Brown

Theses and Dissertations

The stability and maneuverability of aircraft are some key factors for selecting the locations of wings or canards on the fuselage. Another important variable that is considered in the design of an aircraft is drag force which impacts fuel efficiency. This research investigates how drag force of a surrogate aircraft is affected by the placement of the wing or canard along the fuselage. Unique for this study is the placement of the canard in the fuselage nose region, with the leading edge upstream of the nose, resembling the shape of a hammerhead shark's head. When the leading edge of all …

Robust Data Submission Pipeline For Agmip Global Economics Modelers, Raziq Ramli

Discovery Undergraduate Interdisciplinary Research Internship

Agricultural Model Intercomparison and Improvement Project (AgMIP) is an international effort to improve agricultural models and scientific and technological capabilities for assessing the impacts of climate variability and other driving factors on agriculture, food security, and poverty. The Global Economics (GlobalEcon) team in AgMIP conducts extensive model intercomparison to assess the agricultural effects of climate change, bioenergy policies, and socioeconomic factors. Currently, the preparation and sharing of GlobalEcon model data are done manually, which is time-consuming and error-prone. This project aims to address this problem by designing a robust data submission pipeline capable of harmonizing data from diverse modeling groups …

Active Thermography For Additive Manufacturing Processes, Nicholas Jay Wallace

Theses and Dissertations

The goal of the research conducted for this master's thesis is to understand if active thermography is a suitable technique to detect (identify) and measure (approximate depth and or size) defects in additive manufacturing (AM) processes. Although other non-destructive measurement techniques exist, active thermography is an attractive option for AM applications because of the short measurement times that could be implemented between each layer of a print, and because of the relatively inexpensive equipment required. However, pulse thermography is typically applied to detect larger defects (>1 mm) in materials with high thermal conductivity. It was uncertain if active thermography …

Designing Cell-Free Protein Synthesis Systems For Improved Biocatalysis And On-Demand, Cost-Effective Biosensors, Mehran Soltani Najafabadi

Theses and Dissertations

The open nature of Cell-Free Protein Synthesis (CFPS) systems has enabled flexible design, easy manipulation, and novel applications of protein engineering in therapeutic production, biocatalysis, and biosensors. This dissertation reports on three advances in the application of CFPS systems for 1) improving biocatalysis performance in industrial applications by site-specific covalent enzyme immobilization, 2) expressing and optimizing a difficult to express a mammalian protein in bacterial-based CFPS systems and its application for cost-effective, on-demand biosensors compatible with human body fluids, and 3) streamlining the procedure of an E. coli extract with built-in compatibility with human body fluid biosensors. Site-specific covalent immobilization …

Using Machine Learning Techniques To Model The Process-Structure-Property Relationship In Additive Manufacturing, Seyyed Hadi Seifi Shishavan

Theses and Dissertations

Additive manufacturing (AM) is a novel fabrication technique capable of producing highly complex parts. Nevertheless, a major challenge is improving the quality of the fabricated parts. While there are several ways of approaching this problem, developing data-driven methods that use AM process signatures to identify these part anomalies can be rapidly applied to improve the overall part quality during the build. The objective of this dissertation is to model multiple processes within the AM to quantify the quality of the parts and reduced the uncertainty due to variation in input process parameters. The objective of first study is to build …

Microbes On The Mountain: Plant-Microbe Associations And Interactions On Mount St. Helens, Emily Rose Wolfe

Dissertations and Theses

Plant-microbe associations and interactions provide critical context to studies in both community and ecosystem ecology, especially in systems that are relatively new and still undergoing early successional processes. Microbes can colonize the surfaces and interiors of all plant tissues, and these assemblages vary in composition both spatially and temporally, even within the same plant. Endophytes are bacteria or fungi that spend most of their lifecycles living within plant tissues asymptomatically--typically, "endophyte" refers specifically to aboveground tissues such as leaves and stems, and therefore may have direct influences on defenses against herbivory, pathogen or pest tolerance, and even afterlife effects on …

Nonlinear Pricing With Finite Information, Dirk Bergemann, Edmund M. Yeh, Jinkun Zhang

Cowles Foundation Discussion Papers

We analyze nonlinear pricing with finite information. We consider a multi-product environment where each buyer has preferences over a d-dimensional variety of goods. The seller is limited to offering a finite number n of d-dimensional choices. The limited menu reflects a finite communication capacity between the buyer and seller. We identify necessary conditions that the optimal finite menu must satisfy, for either the socially efficient or the revenue-maximizing mechanism. These conditions require that information be bundled, or "quantized," optimally. We introduce vector quantization and establish that the losses due to finite menus converge to zero at a rate …

Free-Free Absorption In Hot Relativistic Flows: Application To Fast Radio Bursts, Esha Kundu, Bing Zhang

Physics & Astronomy Faculty Research

Magnetic flares create hot relativistic shocks outside the light cylinder radius of a magnetized star. Radio emission produced in such a shock or at a radius smaller than the shock undergoes free–free absorption while passing through the shocked medium. In this work, we demonstrate that this free–free absorption can lead to a negative drift in the frequency-time spectra. Whether it is related to the downward drift pattern observed in fast radio bursts (FRBs) is unclear. However, if the FRB down-drifting is due to this mechanism then it will be pronounced in those shocks that have isotropic kinetic energies ≳1044 erg. …

Reduction Of Clabsi In Telemetry Patients Through Limiting Central Line Blood Draw, Caselyn Lok

Student Scholarly Projects

CLABSI is known to be one of the many healthcare-associated infections that has led to an increase in health complications, length of hospital stays, and increased in healthcare cost. There is about 25000 bloodstream infection that occurs annually (Haddadin, Annamaraju, & Regunath, 2020). The PICOT question that guided this project was “How does limiting blood-draw from central venous catheter lines influence the rate of central-line associated bloodstream infections (CLABSI) post-implementation compared to rate of CLABSI pre-implementation after eight weeks?” CLABSI prevention bundles were already being used to guide healthcare providers in handling CVC access. There were 15 scholarly articles that …

Numerical Investigation Of The Effect Of Trailing Edge Deformations On Noise From Jets Exhausting Over Flat Plates, Colby N. Horner

Theses and Dissertations

The design of aircraft propulsion configurations must digress from the typical configurations that are utilized on the majority of aircraft in order to consider the effects of environmental issues as well as the noise that is generated from the engines. One unconventional approach under consideration involves rectangular jets near flat surfaces that are parallel to the jet axis. This type of configuration makes an attempt to muffle the noise that propagates to the ground, but previous experimental work showed that the noise generated by this configuration was actually increased due to the effect that the plate trailing edge exerts on …

Annealing Enabled Immune System Algorithm For Multi-Waypoint Navigation Of Autonomous Robots, Elakiya Jayaraman

Theses and Dissertations

In real world applications such as rescue robots, service robots, mobile mining robots, and mine searching robots, an autonomous mobile robot needs to reach multiple goals with the shortest path while avoiding obstacles. In this thesis, we propose Artificial Immune System (AIS) based algorithms and two hybrids based on AIS associated with the Simulated Annealing (SA) algorithm and Voronoi Diagram (VD) for real-time map building and path planning for multi-goal applications. A global route is initially planned by the Immune System Algorithm (ISA). Then the created path is used to guide the robot to multiple waypoints following the foraging trail. …