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http://digitalcommons.usu.edu/spacegrant/2010/Session1
Recent Events in en-usFri, 18 Nov 2016 15:40:58 PST3600A One-Dimensional Finite-Difference Solver for Fully-Developed Pipe and Channel Flows
http://digitalcommons.usu.edu/spacegrant/2010/Session1/6
http://digitalcommons.usu.edu/spacegrant/2010/Session1/6Mon, 10 May 2010 10:30:00 PDT
An algorithm is developed to solve the fundamental flow cases of fully-developed turbulent flow in a pipe and in a channel. The algorithm uses second-order finite-difference approximations for nonuniform grid spacing and is developed in such a way as to easily facilitate the implementation of several two-equation, Reynolds-Averaged-Navier-Stokes turbulence models. Results are included for the Wilcox 1998 k-ω model.
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Doug F. HunsakerProviding STEM Experiences, Through Robotic Competitions, for Students and Teachers Grades Six Through Twelve
http://digitalcommons.usu.edu/spacegrant/2010/Session1/5
http://digitalcommons.usu.edu/spacegrant/2010/Session1/5Mon, 10 May 2010 10:15:00 PDT
Science, Technology, Engineering, and Math (STEM) is a current emphasis in education. Machi (2009) points out that "in order for the United States to be globally competitive, innovative, and prepared for new economic and security challenges, the U.S. must have a competitive and innovative educational environment that encourages entrepreneurship and excellence in STEM subjects" (p. 1). The U.S. government depends on science, technology, engineering, and math to maintain its position as the world superpower (Machi, 2009, p. 2) and spends "about $700 million a year on elementary and secondary education in the STEM fields through agencies such as NASA, the National Science Foundation and the U.S. Education Department " (Nick, 2010, p. 1). "Every day, a new technology is brought to market by the STEM workforce, enabling people around the world to live longer, better lives (Machi, 2009, p. 2)." From the digital cable box used to watch TV shows to the micro-processor in your car that performs self diagnostics and e-mails the results, technology is used in almost every part of our daily lives.
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Stephen Wiliams et al.Amplifier Design for Aerospike Measurements
http://digitalcommons.usu.edu/spacegrant/2010/Session1/4
http://digitalcommons.usu.edu/spacegrant/2010/Session1/4Mon, 10 May 2010 10:00:00 PDT
Instrumentation amplifiers are needed to amplify thrust signals produced by load cells for accurate measurements in Aerospike testing. Gains are used to increase the resolution thus providing accurate and measurable thrust data. This paper will discuss the design procedure for building a low noise amplifier box along with the results and comparisons from actual measurements.
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Nathan Erni et al.Lunar Network Tracking Architecture for Lunar Flight
http://digitalcommons.usu.edu/spacegrant/2010/Session1/3
http://digitalcommons.usu.edu/spacegrant/2010/Session1/3Mon, 10 May 2010 09:45:00 PDT
A trade study was conducted with the objective of comparing and contrasting the radiometric navigation performance provided by various architectures of lunar-based navigations assets. Architectures considered consist of a compliment of two beacons located on the lunar surface, and two orbiting beacons that provide range and range-rate measurements to the user. Configurations of these assets include both coplanar and linked constellations of frozen elliptic orbiters and halo orbiters. Each architecture was studied during the lunar-approach, lunar-orbit, and landing phases of a South Pole lunar sortie mission. Navigation filter performance was evaluated on the basis of filter convergence latency, and the steady state uncertainty in the navigation solution. The sensitivity of the filter solution to Earth-based tracking augmentation and availability of range measurements was also studied. Filter performance was examined during the build up of the lunar-based navigation system by exploring different combinations of orbiting and surface-based assets.
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Shane B. Robinson et al.The Development of LOX-Based Magnetic Fluid Technology and its Impact on Small Satellites
http://digitalcommons.usu.edu/spacegrant/2010/Session1/2
http://digitalcommons.usu.edu/spacegrant/2010/Session1/2Mon, 10 May 2010 09:30:00 PDT
A magnetic fluid system could potentially replace mechanically moving parts in a satellite as a means of increasing system reliability and mission lifetime, but rather than a standard ferrofluid with magnetic particles, liquid oxygen (LOX) may be a more adequate working fluid. As a pure paramagnetic cryogen, LOX is already heavily used in space, but still requires basic research before being integrated into system development. The objectives of the research conducted were to verify LOX as a magnetic working fluid through experiment and establish a theoretical model to describe its behavior. This paper presents the theoretical, experimental, and numerical results of a slug of LOX being pulsed by a 1.1 T solenoid in a quartz tube with an inner diameter of 1.9 mm. The slug oscillated about the solenoid at 6-8 Hz, producing a pressure change of up to 1.2 kPa. System efficiency based on the Mason number was also studied for various geometric setups, and, using a one-dimensional, finite-differenced model in Matlab 2008a, the numerical analyses confirmed the theoretical model. The research provides groundwork for future applied studies using Comsol Multiphysics 3.5a with complex designs.
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Jeffrey C. Boulware et al.Charge Dynamics in Highly Insulating Space Craft Materials
http://digitalcommons.usu.edu/spacegrant/2010/Session1/1
http://digitalcommons.usu.edu/spacegrant/2010/Session1/1Mon, 10 May 2010 09:15:00 PDT
We present a preliminary report on the theoretical and experimental study of transport models in highly insulating materials. The report is developed in four sections; first we give background on the nature of the problems in space craft charging, the contributions and connections made by the Utah State material physics group. Second we discuss the density of states to explore the connections between material composition and the microscopic and macroscopic transport equations. Third from Maxwell’s equations we present an overview of the transport equations. Finally we present preliminary results using experimental data on KaptonTM, the transport equations and relevant expressions for the density of states.
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Alec Sim et al.