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Articles 2701 - 2730 of 14460
Full-Text Articles in Entire DC Network
Eastern Progress - 24 Aug 2000, Eastern Kentucky University
Eastern Progress - 24 Aug 2000, Eastern Kentucky University
Eastern Progress 2000-2001
No abstract provided.
The Daily Egyptian, August 24, 2000, Daily Egyptian Staff
The Daily Egyptian, August 24, 2000, Daily Egyptian Staff
August 2000
No abstract provided.
Illinois State University Report, August 24, 2000, Illinois State University
Illinois State University Report, August 24, 2000, Illinois State University
Illinois State University Report (1966-2012)
Illinois State University bi-weekly employee newsletter.
Lanthorn, Vol. 35, No. 01, August 24, 2000, Grand Valley State University
Lanthorn, Vol. 35, No. 01, August 24, 2000, Grand Valley State University
Volume 35, August 24, 2000 - June 14, 2001
Lanthorn is Grand Valley State's student newspaper, published from 1968 to the present.
Summer Mustang, August 24, 2000
Summer Mustang, August 24, 2000
Cal Poly Student Newspaper
Student newspaper of California Polytechnic State University, San Luis Obispo, CA.
What Recourse?—Liability For Managed Care Decisions And The Employee Retirement Income Security Act, Wendy K. Mariner
What Recourse?—Liability For Managed Care Decisions And The Employee Retirement Income Security Act, Wendy K. Mariner
Faculty Scholarship
Should managed-care organizations be accountable to patients injured by the company's negligence or wrongdoing? The general rule is that all organizations, including managed-care organizations, are legally liable for causing personal injury as a result of their own negligence or the negligence of their employees or agents.1-4 However, as most observers of the U.S. health care system know by now, there is an exception to this basic legal rule of accountability. The Employee Retirement Income Security Act of 1974 (ERISA) has been interpreted to grant health benefit plans provided by employers or unions (and the managed-care organizations that sell or …
Panama Rejects Special Status For U.S. Military; Will Assist With Plan Colombia, Ladb Staff
Panama Rejects Special Status For U.S. Military; Will Assist With Plan Colombia, Ladb Staff
NotiCen
No abstract provided.
Autonomous Control System For Precise Orbit Maintenance, Manop Aorpimai, Yoshi Hashida, Phil Palmer
Autonomous Control System For Precise Orbit Maintenance, Manop Aorpimai, Yoshi Hashida, Phil Palmer
Small Satellite Conference
In this paper, we describe a closed-loop autonomous control system that enables orbit operations to be performed without the need of any ground segment. The growing availability of GPS receivers on satellites provides an excellent means for autonomous orbit determination and our work builds upon previous work on orbit determination algorithms developed here at Surrey. The orbit is described using a set of epicycle parameters which provide an analytic model of LEO orbits. The parameters in this model are estimated onboard the satellite using a Kalman filter. We describe an enhancement to this software which provides both control as well …
Autonomous Operations Experiments For The Distributed Emerald Nanosatellite Mission , Christopher Kitts, Michael Swartwout
Autonomous Operations Experiments For The Distributed Emerald Nanosatellite Mission , Christopher Kitts, Michael Swartwout
Small Satellite Conference
Distributed space systems are often cited as a means of enabling vast performance increases ranging from enhanced mission capabilities to increased system flexibility. Achieving this vision, however, will require radical advances in the automated control of these multi-satellite systems. To explore this challenge, Santa Clara University and Stanford University have initiated development of a simple, low cost, two-satellite mission known as Emerald. The Emerald mission includes several experiments involving the autonomous operation of distributed space systems. First, “low-level” inter-satellite navigation techniques will be explored. Second, “high-level” multi-satellite health and command management functions will be demonstrated. Due to operational considerations and …
Minimizing Risk Associated With Imaging Payloads: Lessons Learned From A Ccd Experiment Gone Awry, Todd Goforth, Scott Cannon
Minimizing Risk Associated With Imaging Payloads: Lessons Learned From A Ccd Experiment Gone Awry, Todd Goforth, Scott Cannon
Small Satellite Conference
The number of uses for imaging devices in space is rapidly increasing. To evaluate suitability for space-based surveillance and star tracker operation, an experimental payload was developed based on an experimental Charge Coupled imaging Device (CCD). This payload was to have flown on the small STRV-1d satellite (a joint US and British program) to collect data during 600+ minute highly elliptical orbits. These orbits were intended to expose the CCD to high radiation levels and possibly significant solar flare events. The main objective of the experiment was to measure the degradation of the Charge Transfer Efficiency (CTE) of the device, …
Internet Access To Spacecraft, James Rash, Ron Parise, Keith Hogie, Ed Criscuolo, Jim Langston, Chris Jackson, Harold Price
Internet Access To Spacecraft, James Rash, Ron Parise, Keith Hogie, Ed Criscuolo, Jim Langston, Chris Jackson, Harold Price
Small Satellite Conference
The Operating Missions as Nodes on the Internet (OMNI) project at NASA's Goddard Space flight Center (GSFC), is demonstrating the use of standard Internet protocols for spacecraft communication systems. This year, demonstrations of Internet access to a flying spacecraft have been performed with the UoSAT-12 spacecraft owned and operated by Surrey Satellite Technology Ltd. (SSTL). Previously, demonstrations were performed using a ground satellite simulator and NASA's Tracking and Data Relay Satellite System (TDRSS). These activities are part of NASA's Space Operations Management Office (SOMO) Technology Program. The work is focused on defining the communication architecture for future NASA missions to …
Recovery Of The Wide-Field Infrared Explorer Spacecraft, David Everett, Thomas Correll, Scott Schick, Kimberly Brown
Recovery Of The Wide-Field Infrared Explorer Spacecraft, David Everett, Thomas Correll, Scott Schick, Kimberly Brown
Small Satellite Conference
The Wide Field Infrared Explorer was developed to perform astronomy using a cryogenically cooled infrared telescope. Shortly after launch, rapid venting of the cryogen, caused by an untimely cover removal, sent the spacecraft into an uncontrollable spin which exceeded 60 revolutions per minute. Over the next week, the WIRE team developed a plan and successfully executed the procedures necessary to de-spin the spacecraft and gain attitude control, but the cryogen for cooling the instrument was depleted. The recovery of the spacecraft enabled a thorough checkout of most of the subsystems, including the validation of several new technologies. Although the primary …
An Attitude Control System And Commissioning Results Of The Snap-1 Nanosatellite , W.H. Steyn, Y. Hashida, V. Lappas
An Attitude Control System And Commissioning Results Of The Snap-1 Nanosatellite , W.H. Steyn, Y. Hashida, V. Lappas
Small Satellite Conference
SNAP-1 is a low-cost nanosatellite build by Surrey Satellite Technology Ltd. (SSTL), it is amongst other objectives a technology demonstrator for 3-axis stabilisation and orbit control for a future constellation of small satellites during formation flying. The satellite uses a single miniature Ymomentum wheel, 3-axis magnetorquer rods and a single butane gas thruster to ensure a nominal nadirpointing attitude with full pitch control and in-track delta-V manoeuvrability. The magnetorquer rods do momentum maintenance and nutation damping of the Y-wheel. The primary attitude sensor used, is a miniature 3-axis fluxgate magnetometer. Precise orbital knowledge will be obtained using a small single …
Modular Attitude Control System For Microsatellites With Stringent Pointing Requirements, Simon Grocott
Modular Attitude Control System For Microsatellites With Stringent Pointing Requirements, Simon Grocott
Small Satellite Conference
Advancing technology has allowed for the development of low cost attitude control hardware for microsatellites. However, the attitude control design and software development remain a significant cost driver. The Dynacon High Performance Attitude Control system is a modular control system that makes use of reusable algorithm modules enabling the attitude control system to be applied to several different spacecraft missions with very different performance requirements. The High Performance Attitude Control system is described in this paper, and simulation results are shown for a variety of spacecraft.
Real-Time Attitude And Orbit Control System Of A Small Leo Satellite With Parallel-Processing Approach In A Ground Station, Roger Johnson, Sanjay Jayaram, Lei Sun, Chan Ho Ham
Real-Time Attitude And Orbit Control System Of A Small Leo Satellite With Parallel-Processing Approach In A Ground Station, Roger Johnson, Sanjay Jayaram, Lei Sun, Chan Ho Ham
Small Satellite Conference
A Real-time Attitude and Orbit Control System (AOCS) using a parallel processing approach will be implemented using a Satellite Ground Control Station (SGCS). With this approach, the satellite will collect platform (attitude reference) and payload measurements (at 1Hz) over several orbits and down-link to the SGCS (at 5 KHz) where the real-time filtering, fault detection, diagnosis and corrective (if needed) control is generated. The control commands are up-linked to the satellite before losing telemetry lock. A substantial reduction in on-board computation can provide a cheaper and a higher reliable AOCS. In the proposed scheme, an advanced real-time estimation and control …
Aeroastro’S X-Band Transponder – Meeting The Communication Needs Of Tomorrow’S Small Spacecraft , Eric Aamot, Ray Zenick, Kimberly Kohlhepp
Aeroastro’S X-Band Transponder – Meeting The Communication Needs Of Tomorrow’S Small Spacecraft , Eric Aamot, Ray Zenick, Kimberly Kohlhepp
Small Satellite Conference
This paper will discuss a number of technologies and design philosophies leveraged from commercial industry that AeroAstro has applied to the development of a new spacecraft communications subsystem. Although there has been a recent push toward reducing spacecraft mass and cost, there is no commercially available communications equipment that will significantly contribute to that reduction. While spacecraft mass has dropped more than an order of magnitude in the past ten years, radios have not followed this trend. AeroAstro is developing a highly integrated, power-efficient, low operating voltage X-Band telemetry transponder for small satellite applications. This design leverages emerging technology from …
The Kyushu/Us Experimental Satellite Tether (Quest) Mission, A Small Satellite To Test And Validate Spacecraft Tether Deployment And Operations, Johan Carlson, Yosuke Nakamura
The Kyushu/Us Experimental Satellite Tether (Quest) Mission, A Small Satellite To Test And Validate Spacecraft Tether Deployment And Operations, Johan Carlson, Yosuke Nakamura
Small Satellite Conference
In recent years, an increased effort to design, build, and operate small satellites has taken place in universities and laboratories all over the world. These microsatellites provide numerous flight opportunities for science experiments at a fraction of the cost of larger traditional missions. In addition, there has been an increasing trend towards international cooperation on space projects. From the International Space Station to joint commercial ventures, the future of space progress will be shared by countries around the world. Tomorrow’s engineers must prepare for this challenge. This paper provides an overview of the Kyushu/US Experimental Satellite Tether (QUEST) mission, a …
Command And Data Handling Subsystem Design For The Ionospheric Observation Nanosatellite Formation (Ion-F) , John Jensen
Command And Data Handling Subsystem Design For The Ionospheric Observation Nanosatellite Formation (Ion-F) , John Jensen
Small Satellite Conference
This paper describes the approach taken by the ION-F student team in designing a common Command and Data Handling (C&DH) subsystem for three different nanosatellites. It outlines the requirements of the satellites and reasons behind the decision to develop a custom board. The design is based upon industrial-grade components and centered on a Hitachi SuperH RISC Processor. The C&DH subsystem contains a 16 MB telemetry buffer, a digital and analog interface subsystem, and a DMA-oriented CMOS camera framebuffer. Students are fabricating these boards with the assistance of Space Dynamics Laboratory at Utah State University. This design will be flown by …
Digital Cmos Cameras For Attitude Determination, David Meller, Prapat Sripruetkiat, Kristin Makovec
Digital Cmos Cameras For Attitude Determination, David Meller, Prapat Sripruetkiat, Kristin Makovec
Small Satellite Conference
The Ionospheric Observation Nanosatellite Formation (ION-F) satellite cluster consists of three individual spacecraft, which are being developed by the University of Washington (UW), Utah State University (USU), and Virginia Polytechnic Institute and State University (VT). The satellites will demonstrate formation flying and distributed satellite capabilities. A novel component of the Attitude Determination System (ADS) for each satellite is use of low-power, low-mass, inexpensive CMOS cameras for Sun and Earth horizon sensing. This paper describes a candidate camera set of specifications, the configuration of cameras on each ION-F satellite and a sensor fusion scheme for the ADS. Several algorithms for nadir …
Gps Micro Navigation And Communication System For Clusters Of Micro And Nanosatellites , Ray Zenick, Kimberly Kohlhepp
Gps Micro Navigation And Communication System For Clusters Of Micro And Nanosatellites , Ray Zenick, Kimberly Kohlhepp
Small Satellite Conference
Formation flying will quickly revolutionize the way science, remote sensing and surveillance missions are performed in space, enabling a whole new range of applications for small satellites. Currently, there are numerous missions in the planning stages involving formation flying of a constellation of micro or nanosatellites. However, to truly achieve the goals of these formation-flying missions, an accurate means of relative ranging, determining time and position measurements, inter-satellite communications, and controlling the formation states is becoming critical. Today, while there are very expensive products available for positioning and attitude determination, none of them are capable of meeting the precise positioning …
Negesar: New Generation Satellite Architecture , Fabrizio Boer, Giancarlo Borghesi
Negesar: New Generation Satellite Architecture , Fabrizio Boer, Giancarlo Borghesi
Small Satellite Conference
Reduce to the minimum any analog-based system on board the next generation satellites and replace them with the more performing and reliable digital platforms shall be the challenge for all the Space Business World in the next decade. The micro-size NEGESAT Company (2 experienced Space Engineers) has launched, since early 99, the project called NEGESAR (NEw GEneration Satellite ARchitecture) aiming at this objective: to give the Space User a way to launch active and complex Electronic Equipment into space using commercial quality components, that is the same ones developed for the highest performance on Ground. The result is enclosed in …
Design And Development Of Miniature Mechanisms For Small Spacecraft, Brett Huett, Cliff Willey
Design And Development Of Miniature Mechanisms For Small Spacecraft, Brett Huett, Cliff Willey
Small Satellite Conference
With the continued push for smaller, faster, and cheaper spacecraft comes a new era in mechanism design. The desire to develop “Micro Satellites”, along with advances in the processing and selection of materials, have created an abundance of opportunities to miniaturize mechanisms. Simple designs with direct applications of developing technologies are ideal for these miniature mechanisms. This paper will focus on the design and development of a miniature satellite “tool kit”. Six mechanisms were developed by Starsys Research and the Applied Physics Laboratory (APL) at John Hopkins University (JHU) under a NASA Advanced Technology Development (ATD) Program. The mechanisms developed …
Intelligent Reconfigurable Integrated Satellite Processor, Natalie Clark, Paul Furth, Steven Horan
Intelligent Reconfigurable Integrated Satellite Processor, Natalie Clark, Paul Furth, Steven Horan
Small Satellite Conference
We present our Intelligent Reconfigurable Integrated Satellite (IRIS) Processor. At the heart of the system are our reconfigurable vision chips which are capable of massively parallel analog processing. The smart vision chips are capable of not only centroiding and pattern recognition but also tracking and controlling devices including MEMs devices and active pixel arrays. In addition to discussing the active optic and active electronic devices, several small satellite system applications are presented along with experimental and simulation results.
East Min. & Chem Co V. Mahan
2000 Decisions
USDC for the Middle District of Pennsylvania
Ua3/4/8/6 Harriett Downing Oral History, Harriett Downing, Sue Lynn Mcdaniel
Ua3/4/8/6 Harriett Downing Oral History, Harriett Downing, Sue Lynn Mcdaniel
WKU Administration Documents
Harriet Downing interviewed by Sue Lynn McDaniel regarding student life during World War II and her experiences as wife of WKU's fourth president, Dero Downing.
Oxidation Of [(Cyclic Triamine)(1,5-Cyclooctadiene)Iridium]+ Cations By Hydrogen Peroxide Forms Metallaoxetanes, Thomas C. Flood, Masanori Iimura, Jeremy M. Perotti, Arnold L. Rheingold, Thomas E. Concolino
Oxidation Of [(Cyclic Triamine)(1,5-Cyclooctadiene)Iridium]+ Cations By Hydrogen Peroxide Forms Metallaoxetanes, Thomas C. Flood, Masanori Iimura, Jeremy M. Perotti, Arnold L. Rheingold, Thomas E. Concolino
Chemistry and Physics Faculty Articles
Iridaoxetane 3 formed by oxidation of 1 with aqueous H2O2 is isolated and characterized, providing a rare example of formation of a metallaoxetane by direct oxidation of a metal–alkene complex.
Buddhism Reconsidered: A Presuppositional Critique Of Theravada Buddhist Philosophy As Interpreted By David Kalupahana And Illuminated By Other Select Buddhist Scholars, Michael Collender
Buddhism Reconsidered: A Presuppositional Critique Of Theravada Buddhist Philosophy As Interpreted By David Kalupahana And Illuminated By Other Select Buddhist Scholars, Michael Collender
Masters Theses
No abstract provided.