Digital Commons Network^™

Initial Flight Results Of The Rax-2 Satellite, John Springmann, Benjamin Kempke, James Cutler, Hasan Bahcivan

Small Satellite Conference

The second Radio Aurora Explorer satellite, RAX-2, is a triple CubeSat studying the formation of plasma irregularities in Earth’s ionosphere. The spacecraft was developed jointly by SRI International and the University of Michigan, and it is the first satellite funded by the National Science Foundation. RAX-2 launched October 28, 2011 and is currently operating on orbit. RAX uses a bistatic radar configuration to study the ionospheric irregularities: a ground-based incoherent scatter radar station illuminates the irregularities, and the RAX-based radar receiver measures radar scatter from the irregularities. RAX has successfully measured radar scatter from the ionospheric irregularities, providing unprecedented auroral …

Qbx - The Cubesat Experiment, Stephen Arnold, James Armstrong, Clark Person, Michael Tietz

Small Satellite Conference

The Naval Research Laboratory (NRL) launched 2 QbX CubeSats from Cape Canaveral Air Force Station on December 8, 2010 as secondary payloads aboard SpaceX’s Falcon 9 launch vehicle, leveraging the flight opportunity provided by the first COTS Demo Flight of SpaceX’s Dragon Module. This paper will describe the development of the QbX CubeSats, present measured flight data, and evaluate the overall mission performance of the QbX CubeSats.

Operationally Responsive Space-1 (Ors-1) Lessons Learned, Thomas Davis, James Barlow

Small Satellite Conference

Operationally Responsive Space-1 (ORS-1) is the first ORS Office operational satellite and an important milestone to demonstrate the capability to meet emerging and persistent warfighter needs in operationally relevant timelines. Launched in June 2011, ORS-1 was initiated at the direction of the Commander, U.S. Strategic Command and the DoD Executive Agent for Space to address a U.S. Central Command (USCENTCOM) need for enhanced battlefield awareness. The ORS Office led an assessment that produced a unique solution with proven operational utility providing timely coverage and responsive theater tasking that avoided the burden of traditional top-down procurements and provides future growth leveraging …

First Results From The Gps Compact Total Electron Content Sensor (Ctecs) On The Pssct-2 Nanosat, Rebecca Bishop, David Hinkley, Daniel Stoffel, David Ping, Paul Straus, Timothy Brubaker

Small Satellite Conference

The Compact Total Electron Content Sensor (CTECS) is a GPS radio occultation instrument designed for picosatellite and nanosatellite platforms that utilizes a COTS receiver, modified receiver firmware, and a custom designed antenna. CTECS was placed on the Pico Satellite Solar Cell Testbed-2 (PSSCT-2) nanosatellite that was installed on the Space Shuttle Atlantis (STS-135 mission). PSSCT-2 was successfully released from the shuttle on 20 July 2011 and reentered on 8 December 2011. After approximately four weeks of spacecraft checkout and attitude adjustments, CTECS was powered on and began its mission to obtain ionospheric measurements of the total electron content (TEC) and …

Dice Mission Design, Development, And Implementation: Success And Challenges, Chad Fish, Charles Swenson, Tim Neilsen, Bryan Bingham, Jake Gunther, Erik Stromberg, Steven Burr, Robert Burt, Mitch Whitely, Geoff Crowley, Irfan Azeem, Marcin Pilinski, Aroh Barjatya, Justin Petersen

Small Satellite Conference

Funded by the NSF CubeSat and NASA ELaNa programs, the Dynamic Ionosphere CubeSat Experiment (DICE) mission consists of two 1.5U CubeSats which were launched into an eccentric low Earth orbit on October 28, 2011. Each identical spacecraft carries two Langmuir probes to measure ionospheric in-situ plasma densities, electric field probes to measure in-situ DC and AC electric fields, and a magnetometer to measure in-situ DC and AC magnetic fields. Given the tight integration of these multiple sensors with the CubeSat platforms, each of the DICE spacecraft is effectively a “sensor-sat” capable of comprehensive ionospheric diagnostics. Over time, the sensor-sats will …

Evaluation Of Power Control System For Micro And Nano Satellites By Hardware-In-The-Loop Simulator, Yuji Sakamoto, Toshinori Kuwahara, Yoshihiro Tomioka, Kazufumi Fukuda, Kazuya Yoshida

Small Satellite Conference

The evaluation method using Hardware in the Loop (HIL) simulator of power control system for micro and nano satellites is suggested. The results for two satellite projects, which are RISING-2 and RAIKO, are described. The generation power by solar panels and the consuming power by electrical units are supplied or consumed by external instruments. The power-related status data of real satellite are measured via the downlink. As a dummy satellite, satellite simulation software is simultaneously executed, and the status data are compared to ones of real satellite for updating the math models. Through this method, the power environment on orbit …

Community Events Flyer, Islac

Hispanic Heritage of Florida Conference 2012

No abstract provided.

The Things You Can’T Ignore: Evolving A Sub-Arcsecond Star Tracker, John Enright, Doug Sinclair, Tom Dzamba

Small Satellite Conference

The feasibility of a star tracker with 1 arc-second accuracy and 1 deg/sec slew capability is explored, using the ST-16 design as a starting point. Whole-sky simulation is used to determine the impact of optical design on the star tracker availability. The current optical calibration process is examined, and shown to be inadequate for the desired performance. Additional factors that become important at high accuracy are examined. These are detector calibration, temperature variation, chromatic aberration, stellar aberration and proper motion. Plausible methods of dealing with each of these are presented.

Investigating The Use Of Miniaturized Electrodynamic Tethers To Enhance The Capabilities Of Femtosatellites And Other Ultra-Small Satellites, Iverson Bell, Brian Gilchrist, Sven Bilén, Jesse Mcternan

Small Satellite Conference

The success of nanospacecraft and the evolution of the millimeter-scale wireless sensors concept (i.e., “SmartDust”) have generated interest in smaller spacecraft, both as stand-alone satellites and elements in a swarm or maneuverable fleet. However, so-called flat ChipSats proposed as complete spacecraft fabricated on semiconductor wafers or other larger pico- and femtosatellite, highly integrated architectures have an inherently high area-to-mass ratio, and this can result in a short orbital life in low Earth orbit (LEO) due to atmospheric drag. In this paper, we summarize trade studies in which we investigate the use of a very short (few meters), semi-rigid electrodynamic (ED) …

Cadet: A High Data Rate Software Defined Radio For Smallsat Applications, Edward Kneller, Kevin Hyer, Todd Mcintyre, David Jones, Charles Swenson

Small Satellite Conference

The government and private sectors are showing more interest in SmallSats for a wider range of missions. However, mission planners are discovering that even relatively simple missions are generating significant amounts of data, and that a communication infrastructure that supports high data rates must be considered early in mission conceptualization and project planning. In answer to these emerging communication needs, L-3 Communications, in conjunction with Utah State University – Space Dynamics Laboratory, developed the Cadet Radio for the Dynamic Ionosphere CubeSat Experiment (DICE) space weather program. DICE was successfully launched in October 2011, and the Cadet radios are currently down-linking …

Counting Down To The Launch Of Popacs (Polar Orbiting Passive Atmospheric Calibration Spheres), Walter Holemans, R. Gilbert Moore, Jin Kang

Small Satellite Conference

The main objective of Project POPACS (Polar Orbiting Passive Atmospheric Calibration Spheres) is to measure the changes in density of the auroral zone upper atmosphere, in response to various solar stimuli, such as flares and CMEs. The mission consists of deploying three 10 cm diameter Aluminum spheres into an elliptical polar orbit and tracking them as they make repeated perigee passes in the upper atmosphere, with special emphasis on perigee passes within both the northern and southern auroral zones. The spheres have identical external dimensions and surface compositions, and thus identical drag coefficients, but they have different masses (1, 1.5, …

Advanced Mems Components In Closed-Loop Micro Propulsion Applications, Pelle Rangsten, Johan Bejhed, Håkan Johansson, Maria Bendixen, Kerstin Jonsson, Tor-Arne Grönland

Small Satellite Conference

This paper presents recent advances in the development of two MEMS (Micro Electro Mechanical Systems) components suitable for small satellite propulsion applications. First a cold gas MEMS thruster with proportional and closed-loop thrust control and secondly a Xenon flow control module for precision control of extremely low flow rates to Ion engines. The development of these products is ongoing but recent achievements have demonstrated that besides miniaturization also unique performance and functionality can be achieved. The components are described in terms of design, manufacturing, and test results. The flow control module can regulate flows in the range of 5-50 μg/s …

Comparison Of Control Moment Gyros And Reaction Wheels For Small Earth-Observing Satellites, Ronny Votel, Doug Sinclair

Small Satellite Conference

Multi-ton Earth-observing spacecraft have traditionally used control moment gyros (CMGs) to store momentum and to generate the large torques required for fast slew maneuvers. Small 3-axis controlled satellites, by contrast, will typically use cheaper and simpler reaction wheels to perform the same functions. The question then arises: which actuator is better suited for an Earth-observing mission? This paper compares the performance of each actuator subject to identical agile pointing requirements, and identifies the operating conditions in which one actuator outperforms the other.

Research Metrics, Chaouki Abdallah

Publications of the Provost's Office

The State of New Mexico is currently funding UNM and other state institutions using a base budget, topped by funds due to outcome measures that include course completion, degrees awarded, STEMH degrees and degrees earned by students at risk measured by their Pell grant eligibility.

Improving The Quantitative Assessment Of Intraretinal Features By Determining Both Structural And Optical Properties Of The Retinal Tissue With Optical Coherence Tomography, Wei Gao

Open Access Dissertations

The goal of this project is to obtain quantitative assessments of intraretinal features by determining the structural and optical properties of retinal tissue with optical coherence tomography. To accomplish this goal, structural and optical properties, in addition to thickness measurements, were extracted from OCT-based images and were used for the discrimination of DM eyes with and without DR from healthy eyes. First, structural parameters including the thickness, fractal dimension, energy, entropy, correlation and contrast were evaluated for each intraretinal layer using various image processing techniques such as speckle noise removal, retinal segmentation and blood vessel shadow removal. In addition, optical …

Gsu View, 2012-08-16, Office Of Marketing And Communications

GSU View

Newsletter published by Governors State University 2007-current.

Chemistry Major Selected To Attend Dow-Mit Access Program In October, Winthrop University

Winthrop News 2012

• Johnson was selected to participate in the DOW-MIT ACCESS program, which was designed to increase the diversity of qualified applicants to Ph.D. programs in chemistry, chemical engineering and materials science throughout the United States.
• During each of the past two summers, Johnson has conducted full-time research in chemistry faculty member Nick Grossoehme's laboratory investigating protein regulation mechanisms of intracellular copper concentrations.

08-16-2012 Swosu Plans Reception And Orientation For International Students, Southwestern Oklahoma State University

THE BARK ARCHIVE 2012

A welcome back reception is being planned for international students at Southwestern Oklahoma State University on Friday, August 24, on the Weatherford campus.

Social Science Division Meeting Minutes 08/16/2012, Social Science Division

Social Science Division

No abstract provided.

Employing Critical Thinking In The Power Of Persuasion, Steven C. Bahls

Speeches and Statements

No abstract provided.

Elkin, Gwendolyn, 1916-2009 (Sc 2596), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2596. Holographic paper titled “Joel Tanner Hart” by Gwendolyn Elkin, Bowling Green, Kentucky. Biographical paper highlights Hart’s life, career and techniques as an sculptor.

August 16, 2012: Experiments In Unbelief, Bruce Ledewitz

Hallowed Secularism

Blog post, “ Experiments in Unbelief“ discusses politics, theology and the law in relation to religion and public life in the democratic United States of America.

Lytle, William (Sc 2605), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2605. Bound typescript paper titled “George H. Lorimer, a Study of Lorimer, the Magnificent” written by William Lytle. Paper details the life and career of Lorimer, editor of The Saturday Evening Post.

Hays, William Shakespeare, 1837-1907 (Sc 2603), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2603. Chiefly typescript copies of letters from William Shakespeare Hays, Louisville, Kentucky, to Jess and Sue Barkley, Greenville, Kentucky, and a few selected poems. Poems include "Insured", "Sunday Morning", "Eli's Thanksgiving", etc. Also included is general biographical information about Hays.

Board Of Trustees - Bardstown, Kentucky (Sc 2567), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2567. Bound copy of the Board of Trustees record from Bardstown, Kentucky from 1782-1826. Copied from original papers by Sisters of Nazareth, Nazareth, Kentucky.

Facebook Ipo Lockup Expiration, Steven D. Dolvin

All Chapters

When a firm undertakes an IPO, insiders (owners and venture capitalists, among others) agree to retain their shares (i.e., lockup) for a period of time, typically six months. When the lockup period expires, it is customary to see a large block of shares flood the market, having an adverse effect on the stock's price. Facebook just hit its lockup expiration. See article here, NY Times.

Fox, John William, Jr., 1862-1919 (Sc 2600), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2600. Bound volume of letters chiefly from John W. Fox, Jr., New York City, to Micajah Fible, Louisville, Kentucky. Fox writes of topics including his career in journalism and mutual friends.

Mccullock, Sue R. (Sc 2566), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2566. Bound copy of “History of Owensboro, Kentucky,” compiled by Sue R. McCullock. This history includes the early settlement of Daviess County, important citizens, industry, organizations, and general information about Owensboro in the eighteenth and nineteenth centuries.

Vernon Terry Collection Pays Homage To America's Political Passion, Winthrop University

Winthrop News 2012

• A Sign of the Times: the Vernon Terry Political Signature and Memorabilia Collection offers documentation from some of the 44 men who have held the office of president.
• Some of the former presidents whose signatures are included are Abraham Lincoln, Thomas Jefferson and Andrew Jackson.
• Archives is open from 8:30 a.m.-5 p.m. Monday-Friday at 700 Cherry Road in Rock Hill.

Ua80/1 Meeting Minutes, W Club

University Organizations

Minutes of August 2012 W Club Board of Directors meeting regarding athletics at Western Kentucky University.