Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

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end of this year. This paper will describe the process of recovering Ammonium Perchlorate from AP laden water generated from washing out propellant from rocket motors. Author Ammonium Perchlorates; Solid Rocket Propellants 20000066611 Thiokol Propulsion, Brigham City, UT USA Space Shuttle RSRM Propellant: Properties and Transportation Procedures Bennett, R. R., Thiokol Propulsion, USA; [2000]; 31p; In English; Florida Emergency Management Officials, Cocoa Beach, FL, USA Contract(s)/Grant(s): NAS8-38100; Copyright; Avail: Issuing Activity This paper presents in viewgraph form, the properties and transportation procedures for the Space Shuttle Redesigned Solid Rocket Motor (RSRM) Propellant. In summary, 1) All test results show RSRM propellant and motors to meet requirements of Hazard Division 1.3 designation. 2) Additional card gap testing has shown that RSRM propellant will not detonate under conditions that are many times more severe than the worst-case storage or transportation accident scenario. 3) All DoT requirements are closely followed for all transportation and storage of RSRM segments. 4) RSRM propellant has undergone considerable safety testing in addition to all required by DoT for shipping authorization and hazard division classification and is handled safely at all times. 5) RSRM segments are regularly shipped by rail to KSC from Utah. In about 20 years of shipments, there has never been a safety incident involving RSRMs. Derived from text Solid Propellant Rocket Engines; Space Shuttles; Transportation; Rocket Propellants 58 29 SPACE PROCESSING �� 20000064698 Alabama Univ., USA An Indirect Mixed-Sensitivity Approach to Microgravity Vibration Isolation: The Exploitation of Kinematic Coupling In Frequency-weighting Design-Filter Selections Hampton, R. David, Alabama Univ., USA; Whorton, Mark S., Alabama Univ., USA; [2000]; 6p; In English; 2000 American Control Conference, 28-30 Jun. 2000, Chicago, IL, USA Contract(s)/Grant(s): NAG8-1598; RTOP 398-96-02 Report No.(s): ACC-2000; No Copyright; Avail: CASI; A02, Hardcopy; A01, Microfiche Many space-science experiments need an active isolation system to provide them with the requisite microgravity environment. The isolation systems planned for use with the International Space Station have been appropriately modeled using relative position relative velocity, and acceleration states. In theory, frequency-weighting design filters can be applied to these state-space models, in order to develop optimal H2 or mixed-norm controllers with desired stability and performance characteristics. In practice, however, the kinematic coupling among the various states can lead, through the associated frequency-weighting-filters, to conflicting demands on the Riccati design ”machinery.” The results can be numerically ill-conditioned regulator and estimator Riccati equations and/or reduced intuition in the design process. In addition, kinematic coupling can result in a redundancy in the demands imposed by the frequency weights. Failure properly to account for this type of coupling can lead to an unnecessary increase in controller dimensionality and, in turn, controller complexity. This paper suggests a rational approach to the assignment of frequency-weighting design filters, in the presence of the kinematic coupling among states that exists in the microgravity vibration isolation problem. Author Microgravity; Vibration Isolators; Statistical Analysis; Kinematics; Stability; Sensitivity; Vibration 20000067646 NASA Marshall Space Flight Center, Huntsville, AL USA Reduction of Acceleration to Effectively Microgravity Levels Downey, James Patton, NASA Marshall Space Flight Center, USA; [2000]; 1p; In English; No Copyright; Avail: Issuing Activity; Abstract Only
Pressure gradients, i.e. pressure head, and buoyancy driven convection can be greatly decreased in experimental systems by acceleration of the laboratory reference frame at a rate consistent with the acceleration due to gravity. This may be done in a number of ways, the best known of which is the use of orbiting spacecraft. Other techniques include the use of aircraft following an appropriate parabolic trajectory or drop towers. The result is an experimental condition in which fluids experience virtually no outside forces relative to the laboratory reference frame. Such conditions are appropriate for the study of processes with diffusion dominated heat and/or mass Under, the study of phase transitions in the absence of pressure gradients, the study of solutal or thermal capillary convection, or containerless processes. Ways of achieving these conditions and complexities that arise in performing experiments in this environment are discussed. Author Microgravity; Acceleration; Pressure Gradients; Buoyancy 20000067655 NASA Marshall Space Flight Center, Huntsville, AL USA A Technique for Rapidly Deploying a Concentration Gradient with Applications to Microgravity Leslie, Fred, NASA Marshall Space Flight Center, USA; Ramachandran, Narayanan, Universities Space Research Association, USA; [2000]; 1p; In English; No Copyright; Avail: Issuing Activity; Abstract Only The latter half of the last century has seen rapid advancements in semiconductor crystal growth powered by the demand for high performance electronics in myriad applications. The reduced gravity environment of space has also been used for crystal growth tests, especially in instances where terrestrial growth has largely been unsuccessful. While reduced gravity crystal growth affords some control of the gravity parameter, many crystals grown in space, to date, have structural flaws believed to result from convective motions during the growth phase. The character of these instabilities is not well understood but is associated with thermal and solutal density variations near the solidification interface in the presence of residual gravity and g-jitter. In order to study these instabilities in a separate, controlled space experiment, a concentration gradient would first have to be artificially established in a timely manner as an initial condition. This is generally difficult to accomplish in a microgravity environment because the momentum of the fluid injected into a test cell tends to swirl around and mix in the absence of a restoring force. The use of magnetic fields to control the motion and position of liquids has received growing interest in recent times. The possibility of using the force exerted by a non-uniform magnetic field on a ferrofluid to not only achieve fluid manipulation but also to actively control fluid motion makes it an attractive candidate for space applications. This paper describes a technique for quickly establishing a linear or exponential fluid concentration gradient using a magnetic field in place of gravity to stabilize the deployment. Also discussed is a photometric technique for measuring the concentration profile using light attenuation. Results of the ground-based experiments indicate that the concentration distribution is within 3% of the predicted value. Although any range of concentations can be realized, photometric constraints are discussed which impose some limitations on measurements. Author Deployment; Gradients; Microgravity; Nonuniform Magnetic Fields; Concentration (Composition) 20000067686 Alabama Univ., MAE Dept., Huntsville, AL USA Frequency-Weighting Filter Selection, for H2 Control of Microgravity Isolation Systems: A Consideration of the ”Implicit Frequency Weighting” Problem Hampton, Roy David, Alabama Univ., USA; Whorton, Mark S., NASA Marshall Space Flight Center, USA; [1999]; 18p; In English Contract(s)/Grant(s): NAG8-1598; RTOP 398-96-02 Report No.(s): IMTC-9184; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche Many space-science experiments need an active isolation system to provide them with the requisite microgravity environment. The isolation systems planned for use with the International Space Station (ISS) have been appropriately modeled using relative position, relative velocity, and acceleration states. In theory, frequency-weighting design filters can be applied to these state-space models, in order to develop optimal H2 or mixed-norm controllers with desired stability and performance characteristics. In practice, however, since there is a kinematic relationship among the various states, any frequency weighting applied to one state will implicitly weight other states. These implicit frequency-weighting effects must be considered, for intelligent frequency-weighting filter assignment. This paper suggests a rational approach to the assignment of frequency-weighting design filters, in the presence of the kinematic coupling among states that exists in the microgravity vibration isolation problem. Author Hydrogen; Microgravity; Vibration Isolators; Bandpass Filters; Frequencies; Spaceborne Experiments; Weighting Functions; H-2 Control 59
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Scientific and Technical Aerospace
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Introduction Scientific and Technic
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Subject Divisions Table of Contents
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ground equipment and systems. For a
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Subject Categories of the Division
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48 Oceanography 139 Includes the ph
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72 Atomic and Molecular Physics 191
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Document Availability Information T
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Avail: NASA Public Document Rooms.
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NASA CASI Price Tables — Effectiv
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ALABAMA AUBURN UNIV. AT MONTGOMERY
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20000061433 Pisa Univ., Dipartiment
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English; 34th; 34th Thermophysics C
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20000064547 Jet Propulsion Lab., Ca
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in Yellowstone National Park. We ar
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terns of community hysteresis based
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20000064565 Jet Propulsion Lab., Ca
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tion model (DEM) fitting to the sca
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The Carolina slate belt is a 10- to
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20000063373 Los Alamos National Lab
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20000064912 New Energy and Industri
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and discusses the issues and resear
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The objective of this study was to
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distributions with engine test resu
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7.6, while the 1926 events appear t
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We investigate the compositional di
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Flight Center, USA; Moore, T. E., N
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This report presents the Applied Me
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in Goa, India, by 3 - 4 days. Wind
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51 LIFE SCIENCES (GENERAL) Includes
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20000062717 Joint Inst. for Nuclear
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20000064015 Institute for Human Fac
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during 50% (SD 4%) of the breathing
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20000064711 Massachusetts Inst. of
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The analysis of this smaller data s
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vided a functional helmet mount. Th
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61 COMPUTER PROGRAMMING AND SOFTWAR
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The goal of multi-image classificat
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20000063526 Defence Science and Tec
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85 dB amplifier design evolved by o
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20000064594 New Mexico Univ., Elect
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20000064615 NASA Ames Research Cent
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declarations with a pattern recogni
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containing point where interpolatio
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has his own responsibility, while t
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the people, documents and projects
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and experimental technology, many o
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tems. In particular this applicatio
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Over the past decade, high performa
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expensive than a single analysis. I
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20000064726 Carnegie-Mellon Univ.,
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20000064099 Teledyne Brown Engineer
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20000066597 Geophysical Observatory
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20000065633 Institute TNO of Applie
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important conclusion is that for su
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est frame of the string. The modifi
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isotopes. The method and program we
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A detailed study is undertaken, usi
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20000063497 Kaiser Electro-Optics,
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delivers 60% of the x-ray flux from
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76 SOLID-STATE PHYSICS ��
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20000064660 Abdus Salam Internation
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20000067648 NASA Marshall Space Fli
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20000064703 Institute of Atomic Ene
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The BRST approach is applied to the
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20000067671 Hampton Univ., VA USA A
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82 DOCUMENTATION AND INFORMATION SC
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ecoming almost too cumbersome to be
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physical world. These are the two p
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with WFPC2 data. Tests of HSTphot
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A brief description is given of the
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gas, show variations that have rema
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egy, called Power In that would all
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A ABERRATION, 143, 198 ABRASION, 22
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COMPRESSIBLE FLOW, 83 COMPRESSION L
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FATIGUE (MATERIALS), 50, 93, 96 FAT
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LASING, 90 LATE STARS, 224 LATITUDE
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PATCH ANTENNAS, 74 PATHOLOGY, 98 PA
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SPACE PLATFORMS, 38 SPACE PROBES, 2
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WIND PROFILES, 137 WIND TUNNEL TEST
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Brown, Andy, 38 Brown, April S., 20
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Grosvenor, C. A., 70 Grosvenor, J.
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Lu, Gui-Ying, 50 Lugg, Desmond J.,
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Robertson, Tony, 39 Robinson, Jeffr
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Warner, J. D., 63 Warren, James, 16
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Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

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