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Articles 3841 - 3870 of 16289
Full-Text Articles in Entire DC Network
Yamsat: The First Picosatellite Being Developed In Taiwan, Albert Lin, Chih-Li Chang, Steven Tsai, Joe Fong, Chan-Peng Chang, Robin Lin, Chin Wen Liu, Marco Yeh, M.H. Chung, Hsu-Pin Pan, Chi-Hung Hwang
Yamsat: The First Picosatellite Being Developed In Taiwan, Albert Lin, Chih-Li Chang, Steven Tsai, Joe Fong, Chan-Peng Chang, Robin Lin, Chin Wen Liu, Marco Yeh, M.H. Chung, Hsu-Pin Pan, Chi-Hung Hwang
Small Satellite Conference
This paper describes the current planning and design of the YamSat, the first picosatellite being developed in Taiwan. The design, analysis, manufacture, integration, test and operation of the YamSat will be performed by the National Space Program Office (NSPO), Taiwan, R.O.C, in cooperation with other domestic organizations and companies. It is a member of the CubeSat [1], 10cm x 10cm x 10cm size and within 1kg mass. The major objective of the YamSat is to qualify in space the components and technology developed in Taiwan, including a micro-spectrometer payload using Micro Electro Mechanical Systems (MEMS) technology. The YamSat will be …
A Nanosatellite Mission To Investigate Equatorial Ionospheric Plasma Depletions: The U. S. Air Force Academy’S Falconsat-2, L. Habash Krause, J.J. Sellers, C.L. Enloe, R. Humble, J. White
A Nanosatellite Mission To Investigate Equatorial Ionospheric Plasma Depletions: The U. S. Air Force Academy’S Falconsat-2, L. Habash Krause, J.J. Sellers, C.L. Enloe, R. Humble, J. White
Small Satellite Conference
An overview of the United States Air Force Academy’s (USAFA’s) FalconSat-2, a nanosatellite designed to investigate F region ionospheric plasma depletions, is presented. Instruments aboard FalconSat-2 will sample in situ plasma density and temperature at a rate of 10 Hz and 1.0 Hz, respectively. The choice of sampling rate provides for resolution of 2-10 km plasma depletions, important since plasma anisotropies of this scale size are known to disrupt Ultra High Frequency (UHF) radio transmissions. A novel sensor, the Miniature Electrostatic Analyzer (MESA), is presently under development by USAFA faculty and will be used to measure plasma density with its …
University Of Tokyo's Cubesat Project: Its Educational And Technological Significance, Yuichi Tsuda, Nobutada Sako, Takashi Eishima, Takahiro Ito, Yoshihisa Arikawa, Norihide Miyamura, Akira Tanaka, Shinichi Nakasuka
University Of Tokyo's Cubesat Project: Its Educational And Technological Significance, Yuichi Tsuda, Nobutada Sako, Takashi Eishima, Takahiro Ito, Yoshihisa Arikawa, Norihide Miyamura, Akira Tanaka, Shinichi Nakasuka
Small Satellite Conference
This paper describes outline of the University of Tokyo Intelligent Space Systems Laboratory(ISSL)'s CubeSat \XI" for the demonstration of the pico-satellite bus technology and validation of the commercial- o_-the-shelf parts in space as well as the earth imaging mission. CubeSat project is the international joint program, which aims for developing and actually launching 10cm cubic satellites weighing less than 1kg to the earth's orbit. 18 CubeSats developed by Japanese and U.S. institutes are to be launched by the Russian launch vehicle \Dnepr" in May, 2002 to the Sun-synchronized orbit. The project in ISSL is conducted by 20 space engineering students …
Use Of An Operations Simulator For Small Satellites, Sid Saraf, Chahé Adourian, Philip Melanson, Mak Tafazoli
Use Of An Operations Simulator For Small Satellites, Sid Saraf, Chahé Adourian, Philip Melanson, Mak Tafazoli
Small Satellite Conference
The Canadian Space Agency (CSA) has initiated the Science Satellite (SCISAT) mission as part of its ongoing space science program. The SCISAT-1 satellite will be operated from CSA's mission operation centre in St- Hubert, Québec. The use of an operations simulator is critical in mitigating any mission level risk. During an anomaly situation the operation team's only line of defence against a mission failure could be the simulator. The SCISAT-1 simulator could also be an effective tool to ensure that commands or command sequences that are detrimental to the spacecraft or the science planning are not up-linked accidentally. The best …
Getting Started: Using A Global Circumnavigation Balloon Flight To Explore Picosatellite (Cubesat) Technology, Keith Bennett, Michael Swartwout, Barry Tobias, Patrick Mcnally
Getting Started: Using A Global Circumnavigation Balloon Flight To Explore Picosatellite (Cubesat) Technology, Keith Bennett, Michael Swartwout, Barry Tobias, Patrick Mcnally
Small Satellite Conference
Washington University's Project Aria is currently involved in the CubeSat program. Project Aria is a student-led engineering education, research, and K-12 outreach program. The project’s CubeSat goal is the development of a spherical imaging spacecraft, the "Palantir", ready for launch in late 2002. Recently, the Palantir team was offered the opportunity to fly a small payload on a global circumnavigation balloon flight in mid-2001. The payload would collect atmospheric data such as temperature, pressure, and humidity. The student team decided to use this opportunity to explore various technologies they plan for Palantir. This resulting in a fast, challenging engineering project …
The Use Of Hibernation Modes For Deep Space Missions As A Method To Lower Mission Operations Costs , E. Reynolds, P. Panneton, M. Reinhart, D. Mehoke, W. Dellinger, S. Williams, J. Perschy, R. Harvey, P. Carr
The Use Of Hibernation Modes For Deep Space Missions As A Method To Lower Mission Operations Costs , E. Reynolds, P. Panneton, M. Reinhart, D. Mehoke, W. Dellinger, S. Williams, J. Perschy, R. Harvey, P. Carr
Small Satellite Conference
Hibernation modes have been used in the past in the commercial and military sector under the name of ‘on-orbit storage’ or ‘onorbit spare’. Satellites that have used this technique include: METEOSAT-5 (Europe). SOOS (Navy), NOVA (Navy), GOES-10 (NOAA). These spares are used to quickly restore functionality of the system if there should be an on-orbit failure. Up until now, scientific satellites have not incorporated hibernation modes in their baseline mission timeline – though several missions used them to perform extended missions: GIOTTO and ISEE- 3/ICE. During its competitive proposal phase, CONTOUR baselined a hibernation mode as a method to reduce …
Cubesat: The Development And Launch Support Infrastructure For Eighteen Different Satellite Customers On One Launch , Jordi Puig-Suari, Clark Turner, Robert Twiggs
Cubesat: The Development And Launch Support Infrastructure For Eighteen Different Satellite Customers On One Launch , Jordi Puig-Suari, Clark Turner, Robert Twiggs
Small Satellite Conference
Stanford University and California Polytechnic State University have combined efforts to develop a means of launching small picosatellites called CubeSat. The CubeSat is a 10cm cube weighting 1 kg or less. The launching system developed will provide launches for three satellites in one launcher tube. The first mission for this launcher will be to fly six tubes to launch as many as 24 CubeSats in May 2002 on a Kosmotras, Dnepr ELV from Bikinour, Ukraine. Stanford and Cal Poly are providing active technical support for the CubeSat developers, which are mostly universities. Once the CubeSats have been developed by the …
A Virtual Ground Station Based On Distributed Components For Satellite Communications , Steve Bernier, Michel Barbeau
A Virtual Ground Station Based On Distributed Components For Satellite Communications , Steve Bernier, Michel Barbeau
Small Satellite Conference
Communication with Low-Earth Orbit (LEO) satellites requires the set up of a ground station which is a complex and costly installation. Moreover, a LEO satellite is accessible only during certain time slots from a given ground station. In other words, access to LEO satellites is on an intermittent basis and is constrained by the availability of ground stations. The work presented in this paper aims at augmenting the accessibility to the services offered by LEO satellites. We have devised a concept of virtual ground station available over the Internet. A virtual ground station can be used by any client with …
Tu Sat 1—An Innovative Low-Cost Communications Satellite , Jacob Oehrig, Jeremy Schea, Adam Bennett, Noel Schutt, John Lee, W.C. Holmes, Dave Prentice, Andrew Platt, David Voss, Jonathan Voss, Jeffery Dailey, H.D. Voss
Tu Sat 1—An Innovative Low-Cost Communications Satellite , Jacob Oehrig, Jeremy Schea, Adam Bennett, Noel Schutt, John Lee, W.C. Holmes, Dave Prentice, Andrew Platt, David Voss, Jonathan Voss, Jeffery Dailey, H.D. Voss
Small Satellite Conference
Taylor University (TU), an undergraduate liberal arts university, is developing a communication Cube- Sat. TU Sat 1 incorporates powerful microelectronics, a gravity gradient boom, and a low-cost email communications system capable of operating at a 115-kbps rate near 0.9 GHz. The goal is to demonstrate low cost communication for remote villages in third world countries. TU Sat 1 also includes a magnetometer and Langmuir probe to measure plasma density and temperature at an altitude of 650 km. Furthermore, TU Sat 1 provides students with the needed experience and skills to be on the leading edge of innovation.
Design Of A Distributed Ground Support System For Small Satellites, R.M. Barry, P.J. Bakkes
Design Of A Distributed Ground Support System For Small Satellites, R.M. Barry, P.J. Bakkes
Small Satellite Conference
On February 23, 1999 South Africa's first satellite SUNSAT was launched. The satellite was designed and built entirely at the University of Stellenbosch, a project spanning 8 years. Up to 1999 the bulk of the development work was done on the satellite itself, with time constraints limiting the work done on the ground support system. This led to a situation where the ground station was developed in the two months prior to the launch and shortly afterwards. The system was developed with the specific purpose of supporting only SUNSAT. The final product was a ground support system consisting of a …
Cubesats: A Technology And Science Mission Low-Cost Test Bed, Victor Aguero
Cubesats: A Technology And Science Mission Low-Cost Test Bed, Victor Aguero
Small Satellite Conference
With the demonstration of low cost pico-satellites, and the development of Stanford University’s Cubesat program, a new test bed for technology and science demonstrations is gaining acceptance. Cubesat spacecraft, having a mass of approximately 1 kg, are appropriately suited for test and qualification of microelectronics and MEMS technologies. While these spacecraft currently have subsystems with limited functionality, existing micro-fabricated technology and new technology under development for space will quickly change this picture. Examples of capabilities and technologies on the micro-system level achievable in the next few years are ion thrusters, precise attitude control, formation flying, dynamic mesh network communications, and …
Nihon University Cubesat Program, Yasuyuki Miyazaki, Hiroshi Isobe, Tsuyoshi Kodama, Michiharu Uchiki, Shunsuke Hinuma
Nihon University Cubesat Program, Yasuyuki Miyazaki, Hiroshi Isobe, Tsuyoshi Kodama, Michiharu Uchiki, Shunsuke Hinuma
Small Satellite Conference
The CubeSat program is now proceeding in Japan and U.S. academic institutions and radio groups. CubeSat is a 10cm cubed, 1kg weighted micro-satellite. The first launch of CubeSats is scheduled in May 2002. The second launch will be realized in autumn 2002 or later. Subsequent launch is also planned. Nihon University is going to join the second launch. Our program consists of two phases. At the first phase, we are developing a CubeSat for the second launch opportunity. The purpose of the first phase is that the students learn the whole process of the micro satellite development and operation. At …
Development Of Formation Flight And Docking Algorithms Using The Spheres Testbed, Allen Chen, Alvar Saenz-Otero, Mark Hilstad, David Miller
Development Of Formation Flight And Docking Algorithms Using The Spheres Testbed, Allen Chen, Alvar Saenz-Otero, Mark Hilstad, David Miller
Small Satellite Conference
The MIT Space Systems Laboratory is developing the SPHERES formation flight testbed to provide the Air Force and NASA with a long term, replenishable, and upgradable testbed for the validation of high risk metrology, control, and autonomy technologies. These technologies are critical to the operation of distributed satellite and docking missions such as TechSat21, Starlight, Terrestrial Planet Finder, and Orbital Express. To approximate the dynamics encountered by these missions, the testbed consists of three microsatellites, or “spheres,” which can control their relative positions and orientations in six degrees of freedom. The testbed can operate in 2-D on a laboratory platform …
Impredict: A Fast Image Prediction Software And Its Application In The Sstl Off-Axis Image Scheduling System , S.-F. Wu, A. Brewer, P.L. Palmer
Impredict: A Fast Image Prediction Software And Its Application In The Sstl Off-Axis Image Scheduling System , S.-F. Wu, A. Brewer, P.L. Palmer
Small Satellite Conference
A major cost saver in low-cost missions is reducing operation costs. This paper outlines the work carried out at Surrey Space Center (SSC) to reduce the time required to generate image schedules for tasking the remote sensing satellites. The principle and basic algorithms of an innovative imaging prediction approach are first briefly presented, which result in a fast imaging prediction software, the ImPredict. Experiment results show that its prediction speed is several orders of magnitude faster than the traditional trajectory-checking approach while kee ping an even better accuracy. The software has currently been implemented as windows DLL, written in ‘C’, …
The Pcsat Mission And Cubesat Design Notes, Bob Bruninga, Ens Boutros, Ens Nolan, Ens Schwenzer, Ens Lawrence, Ltcl B. Smith, D. Boden
The Pcsat Mission And Cubesat Design Notes, Bob Bruninga, Ens Boutros, Ens Nolan, Ens Schwenzer, Ens Lawrence, Ltcl B. Smith, D. Boden
Small Satellite Conference
There are growing opportunities for Universities to gain educational access to Space. The Naval Academy has used the Department of Defense Space Test Program for its PCsat and Sapphire projects and the Stanford Cubesat program offers a unique opportunity to get numerous small student satellite payloads into space. As a spin-off of our PCsat project, we have investigated several off-the-shelf solutions to the Telemetry, Command and control portion of small satellites that can greatly simplify small satellite and CubeSat designs. This permits students to concentrate on the various payloads and other aspects of the project without starting from scratch with …
Aquagsat – A Sun Pointing Picosatellite Powered By A Regenerative Fuel Cell, Thomas Lowery, Kyle Ottinger
Aquagsat – A Sun Pointing Picosatellite Powered By A Regenerative Fuel Cell, Thomas Lowery, Kyle Ottinger
Small Satellite Conference
A unique opportunity of low-cost access to space in is being offered to many educational institutions and commercial interests around the world. The Cubesat program offers launch opportunities for pico-satellites (< 1kg) which can be built for a reachable price range, thus extended the access to space out further into the publics grasp. The current cubesat projects offer up to 200 grams of payload to be for small lowearth- orbit (LEO) experiments. Along with the increasing trend in small spacecraft, alternate forms of power are being developed. Such as the unitized regenerative fuel cell (URFC). A URFC extracts the energy from the formation of H2O and utilizes it as power. The URFC has the ability to then reverse the process inputting the power necessary to break down the H2O into H2 and O2 and storing the products. Thus, applied to space applications URFC serves as a nonhazards, cheap, and infinitely renewable energy source. AquaGSat will utilize this access to lowearth- orbit (LEO) by providing a platform for a small URFC and other experiments of similar power needs. This report details the preliminary design of AquaGSat “Water EnerGy” Satellite. The AquaGSat was designed with a modular vision of being able to implement similar experimental payloads that share power and attitude control requirements. Design drivers for AquaGSat are: innovation, maximize energy per volume ratio, utilization of existing technology, and simplicity. The basic shape and composition of the external shell of the spacecraft is provided by the P-POD Payload Planners Guide. P-POD will eject its cubesat load at a certain location in orbit (600 km to 800 km). Once safely away the cubesats will activate themselves and begin their mission. To accomplish AquaGSat’s mission, it is a threeaxis stabilized sun-pointing satellite, because of its large power needs. The sections that follow consider the design and analysis that were performed. Including URFC, Mission Design, P-POD requirements, Thermal, Vibration and Structural Analysis, and Attitude Determination and Control Model and Simulation results, Power and Communications subsystems.
The Design And Development Of A Terminal Node Controller And Gps/Telemetry Beacon For Space And Ground Applications , James Gutshall, Anuradha Chandrasekaran
The Design And Development Of A Terminal Node Controller And Gps/Telemetry Beacon For Space And Ground Applications , James Gutshall, Anuradha Chandrasekaran
Small Satellite Conference
This document presents the design and development of a new terminal node controller (TNC) and GPS/telemetry beacon for space and ground applications. The techniques developed are unique and innovative in the field of space communication. It outlines the objectives; the system requirements; the system layout; the theory of operation; software; communication protocols, including equipment specifications and other major aspects of the system. An important feature of this system is the extensive use of commercial off the shelf (COTS) components, which has lowered cost and shortened development time. Key words: terminal node controller, TNC, GPS, telemetry, beacon, space communications, satellite, nanosatellite, …
Aptus: Applications For Tether United Satellites, Meredith Fitzpatrick
Aptus: Applications For Tether United Satellites, Meredith Fitzpatrick
Small Satellite Conference
Two ten centimeter cube micro-satellites will be built at the W.R.Woolrich Laboratories at the University of Texas at Austin for the purpose of providing visual data regarding the changing density of the Earth’s atmosphere at low earth orbit altitudes, and investigating the ability of electro-dynamic tethers to change the orbital altitude of a small satellite. The cubes will be tethered together via a highly reflective Aracon fiber that will be approximately three kilometers in length. The cubes will separate after orbit deployment, placing the tether in tension. The tether will reflect sunlight as it passes over the Earth, making it …
Design Of A Long-Distance Martian Rover, Elizabeth Butt
Design Of A Long-Distance Martian Rover, Elizabeth Butt
Small Satellite Conference
Martian spacecraft have played a vital part in educating scientists about the Mars environment. Specifically, they have allowed us to believe that there are traces of water present on certain parts of the planet. One major scientific objective goal, based on this discovery, is to further explore these potential water sources. One way to achieve this goal is to send a long-distance Martian rover to Mars so that it can inspect these water sites. Although rovers have had successful missions on Mars, the idea of a long-distance rover involves re-designing many aspects of the past rovers. This paper explores the …
A Ground-Based Prototype Of A Cmos Navigational Star Camera For Small Satellite Applications , Brian Shucker
A Ground-Based Prototype Of A Cmos Navigational Star Camera For Small Satellite Applications , Brian Shucker
Small Satellite Conference
Small satellites are now capable of performing missions that require accurate attitude determination and control. However, low size, power, and cost requirements limit the types of attitude sensors that can be used on a small craft, making attitude estimation difficult. In particular, star trackers—often the attitude sensors of choice for larger spacecraft—are not practical for small satellites. This paper describes a miniature navigational star camera based on CMOS sensor technology that is appropriate for small satellite applications. A ground-based prototype version has been built to demonstrate the technology. Hardware design and algorithms for star-pattern recognition and attitude estimation are discussed, …
The Design Of The Communication And Telemetry System Used By The Ionospheric Observation Nanosatellite Formation Mission , Anuradha Chandrasekaran, James Gutshall
The Design Of The Communication And Telemetry System Used By The Ionospheric Observation Nanosatellite Formation Mission , Anuradha Chandrasekaran, James Gutshall
Small Satellite Conference
This document describes the approach taken by the Ionospheric Observation Nanosatellite Formation (ION-F) communication team in designing and developing a ground communication system, space communication system, and amateur communication system for three satellites in the ION-F constellation. It outlines the mission objectives, the system requirements, the theory of operation, hardware, software, communication protocols; including equipment specifications and other major aspects of the system. An important feature of the communication system is the extensive use of commercial off the shelf (COTS) components, which has lowered cost and shortened development time. This system will be adopted by all three universities.
Snap-1: A Low Cost Modular Cots-Based Nano-Satellite – Design, Construction, Launch And Early Operations Phase , C. Underwood, G. Richardson, J. Savignol
Snap-1: A Low Cost Modular Cots-Based Nano-Satellite – Design, Construction, Launch And Early Operations Phase , C. Underwood, G. Richardson, J. Savignol
Small Satellite Conference
Driven by the personal computer and personal communications markets, commercial-off-the-shelf (COTS) microelectronic systems have advanced considerably in the last few years, making it now feasible to construct highly capable “nano-satellites” (i.e. sub-10 kg satellites) to provide cost-effective and rapid-response, orbiting-test-vehicles for advanced space missions and technologies. The UK’s first nano-satellite: SNAP-1 - designed and built by Surrey Space Centre (SSC) and Surrey Satellite Technology Ltd (SSTL) staff - is an example of such a test-vehicle, in this case, built with the primary objective of demonstrating that a sophisticated, fully agile nano-satellite can be constructed rapidly, and at very low cost, …
Multiple Quantum Well Retromodulators For Spacecraft-To-Spacecraft Laser Interrogation, Communication, And Navigation , Glenn Creamer, Charmaine Gilbreath, Timothy Meehan, Mena Ferraro Stell, Michael Vilcheck, William Rabinovich
Multiple Quantum Well Retromodulators For Spacecraft-To-Spacecraft Laser Interrogation, Communication, And Navigation , Glenn Creamer, Charmaine Gilbreath, Timothy Meehan, Mena Ferraro Stell, Michael Vilcheck, William Rabinovich
Small Satellite Conference
This paper describes a novel concept for laser-based interrogation, communication, and navigation between multiple spacecraft platforms using a gimbaled laser source on a pursuer spacecraft and a target board populated with retromodulators (modulating retroreflectors) integrated on a host spacecraft. The combined laser source and retroreflectors can provide centimeter-level relative positioning between each vehicle, as well as spacecraft-tospacecraft laser communication via semiconductor-based Multiple Quantum Well retromodulators. Additionally, strategies are developed for utilizing the target board retromodulator array to provide relative attitude between each vehicle. In this scenario, each reflector has its own unique modulating code sequence, allowing the returned signals to …
A Systems Engineering Tool For Small Satellite Design, Allan Mcinnes, Daniel Harps, Jeffrey Lang, Charles Swenson
A Systems Engineering Tool For Small Satellite Design, Allan Mcinnes, Daniel Harps, Jeffrey Lang, Charles Swenson
Small Satellite Conference
The growing popularity of small satellites for applications of all kinds has lead to a marked increase in the number of requests from customers of The Aerospace Corporation for studies involving small satellites. The existing design tools used by the Corporation for concept evaluation of large spacecraft have, in many cases, proven inadequate for these small spacecraft studies. As a result, Aerospace is developing a systems engineering tool to support the conceptual design of small satellites. The Aerospace Corporation’s small satellite systems engineering tool utilizes a spreadsheet-based approach to efficiently track information regarding the mass, power, and volume of the …
A Ccsds Software System For A Single-Chip On-Board Computer Of A Small Satellite, Isabel Rutter, Tanya Vladimirova, Hans Tiggeler
A Ccsds Software System For A Single-Chip On-Board Computer Of A Small Satellite, Isabel Rutter, Tanya Vladimirova, Hans Tiggeler
Small Satellite Conference
The work presented in this paper is part of a Surrey Space Centre research project that aims to reduce the size of an on-board computer to a single chip facilitating further miniaturisation of small satellites. The paper is concerned with a communication system, specifically designed to meet the needs of a single-chip onboard computer - a simplified yet reliable and automated standalone alternative software implementation of the Consultative Committee of Space Data Systems (CCSDS) protocol communicating with a standard universal asynchronous receiver-transmitter (UART) peripheral. Details of the design and implementation stages of a CCSDS package coded in the language C …
High-Accuracy Ranging Using Spread-Spectrum Technology, Gary Mitchell
High-Accuracy Ranging Using Spread-Spectrum Technology, Gary Mitchell
Small Satellite Conference
Small satellite formation flying is an important new technology. Of prime importance in formation flying is the need to determine high-accuracy real-time satellite-to-satellite range and velocity information. Spread spectrum technology is usually used for this purpose, but there are limitations to this approach. Traditional spread-spectrum ranging involves either one-way ranging (e.g. the GPS constellation) or round-trip ranging. Both of these are useful, but each has limitations. One-way ranging requires highly accurate synchronized clocks on each satellite. Time synchronization, as well as frequency stability, is required and time synchronization is difficult to achieve between satellites. If the ranging accuracy requirements are …
August 15, 2001 Cal Poly Report, Public Affairs Office
August 15, 2001 Cal Poly Report, Public Affairs Office
Cal Poly Report
No abstract provided.
Eastern Progress - 15 Aug 2001, Eastern Kentucky University
Eastern Progress - 15 Aug 2001, Eastern Kentucky University
Eastern Progress 2001-2002
No abstract provided.
Eng 1001g-011: Composition And Language, Christopher Hanlon
Eng 1001g-011: Composition And Language, Christopher Hanlon
Fall 2001
No abstract provided.
Eng 3005-001-002: Technical Communication, Angela Vietto
Eng 3005-001-002: Technical Communication, Angela Vietto
Fall 2001
No abstract provided.