Academic and Other Papers

1. History of the Crystalline Silicon Photovoltaic Cell Research Program at Sandia National Laboratories:
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2. Report of the Scientific and Technical Subcommittee on its 38th session, held in Vienna from 12 to 23 February 2001. Remote sensing of the Earth by satellite, use of nuclear power sources in outer space, strengthening inter-agency cooperation, increasing use of space applications and services, and implementation of an integrated, and spacebased global natural disaster management system:
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3. Reusable Launch Vehicles and Spaceports: Programs and Concepts for 2001, provides technical and business information on U.S. commercial and government reusable launch vehicles (RLVs) and spaceports. The report describes operational vehicles and spaceports as well as efforts currently in development or proposal stages.
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4. Photovoltaic Power Systems and The National Electrical Code: Suggested Practices. This guide provides information on how the National Electrical Code (NEC) applies to photovoltaic systems.
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5. Space Debris: National research on space debris, safety of space objects with nuclear power sources on board and problems of their collisions with space debris
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6. Unknown
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7. The Committee on the Peaceful Uses of Outer Space held its forty-third session at the United Nations Office at Vienna from 7 to 16 June 2000. ) Ways and means of maintaining outer space for peaceful purposes. ) Report of the Scientific and Technical Subcommittee on its thirty-seventh session. ) Report of the Legal Subcommittee on its thirtyninth session. ) Spin-off benefits of space technology: review of current status. ) Other matters. ) Report of the Committee to the General Assembly.
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8. Unknown
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9. Unknown
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10. Modeling and Control of a Synchronous Generator With Electronic Load. Ivan Jadric
    Design and analysis of a system consisting of a variable-speed synchronous generator that supplies an active dc load (inverter) through a three-phase diode rectifier requires adequate modeling in both time and frequency domain. In particular, the system,s control-loops, responsible for stability and proper impedance matching between generator and load, are difficult to design without an accurate small-signal model. A particularity of the described system is strong non-ideal operation of the diode rectifier, a consequence of the large value of generator,s synchronous impedance. This non-ideal behavior influences both steady state and transient performance. This thesis presents a new, average model of the system. The average model accounts, in a detailed manner, for dynamics of generator and load, and for effects of the non-ideal operation of diode rectifier. The model is non-linear, but time continuous, and can be used for large- and small-signal analysis. Web: http://scholar.lib.vt.edu/theses/
    Jadric, Ivan.pdf File Size: 661k
    
    
11. Dynamics and Control of Magnetostatic Structures by Jeffry Clifton Windsor North Carolina State University
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12. A Smart Implementation of Turbo Decoding for Improved Power Efficiency By Abayomi Jemibewon
    Error correction codes are a means of including redundancy in a stream of information bits to allow the detection and correction of symbol errors during transmission. The birth of error correction coding showed that Shannon,s channel capacity could be achieved when transmitting information through a noisy channel. Turbo codes are a very powerful form of error correction codes that bring the performance of practical coding even closer to Shannon,s theoretical specifications. Bit-error-rate (BER) performance and power dissipation are two important measures of performance used to characterize communication systems. Subject to the law of diminishing returns, as the resolution of the analog-to-digital converter (ADC) in the decoder increases, BER improves, but power dissipation increases. The number of decoding iterations has a similar effect on the BER performance and power dissipation of turbo coded systems. This is significant since turbo decoding is typically practiced in a fixed iterative manner, where all transmitted frames go through the same number of iterations. This is not always necessary since certain good frames would converge to their final bits within a few iterations, and other bad frames never do converge.
    Web: http://scholar.lib.vt.edu/theses/
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13. All-fiber Spectral Filters Based on LP01 - LP11 Mode Coupling and Applications in Wavelength Division Multiplexing and Dispersion Compensation by Jagannathan, Jyothikumar (ABSTRACT) All-fiber spectral filters have the advantages of providing low coupling loss and being readily integrated into fiber-optic networks. Spectral filters made of single-mode identical or dissimilar core parallel fibers provide 3-dB spectral widths on the order of 1 to 10 nm. A spectral filter made of single-mode and dual-mode fibers and operating based on coupling of power between LP01 and LP11 modes is proposed for applications as narrowband demultiplexers and as broadband mode converters with spectral widths of fraction of 1 nm to few 10 nm, respectively.
    Web: http://scholar.lib.vt.edu/theses/
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14. Unknown
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15. Design of Integrated, Low Power, Radio Receivers in BiCMOS Technologies by William B. Kuhn
    Web: http://scholar.lib.vt.edu/theses/
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16. Optical Three-Dimensional Image Matching using Holographic Information by Taegeun Kim
    We present a three-dimensional (3-D) optical image matching technique and location extraction techniques of matched 3-D objects for optical pattern recognition. We first describe the 3-D matching technique based on two-pupil optical heterodyne scanning. A hologram of the 3-D reference object is first created and then represented as one pupil function with the other pupil function being a delta function. The superposition of each beam modulated by the two pupils generates a scanning beam pattern. This beam pattern scans the 3-D target object to be recognized. The output of the scanning system gives out the 2-D correlation of the hologram of the reference object and that of the target object. When the 3-D image of the target object is matched with that of the reference object, the output of the system generates a strong correlation peak. This theory of 3-D holographic matching is analyzed in terms of two-pupil optical scanning. Computer simulation and optical experiment results are presented to reinforce the developed theory.
    Web: http://scholar.lib.vt.edu/theses/
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17. Numerical Simulation of the Transition Region in Hypersonic Flow By Scott Andrew McKeel
    Web: http://scholar.lib.vt.edu/theses/
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18. Tool and Information Management in Enigneering Design by Mark Thomas
    As workstations and the network which connects them have become more powerful, the information available to engineers has become enormous. This research discusses the problems engineers encounter in managing this information, in collaborating with other engineers, and in integrating and using suites of computer-based tools. We introduce a computer environment, called n-dim, which supports information management and collaboration; n-dim accomplishes this by having a flat space of persistent objects over which the end user can build structures, called models, and can describe these models by creating grammars, called modeling languages. n-dim also supports the maintenance of the history of these collaborative processes. Carnegie Mellon University
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19. Spacecraft Attitude Tracking Control by Matthew R. Long
    Web: http://scholar.lib.vt.edu/theses/
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20. Computational Evaluation of Quiet Tunnel Hypersonic Boundary Layer Stability Experiments. by Manning, Melissa Lynn at North Carolina State University
    A computational evaluation of two stability experiments conducted in the NASA Langley Mach 6 axisymmetric quiet nozzle test chamber facility is conducted. Navier- Stokes analysis of the mean flow and linear stability theory analysis of boundary layer disturbances is performed in the computations. The effects of adverse pressure gradient and wall cooling are examined.
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21. Analysis of Hypersonic Aircraft Inlets Using Flow Adaptive Mesh Algorithms. (Under the direction of D. Scott McRae.) by Neaves, Michael Dean.
    The numerical investigation into the dynamics of unsteady inlet flowfields is applied to a three-dimensional scramjet inlet-isolator-diffuser geometry designed for hypersonic type applications. The Reynolds-Averaged Navier-Stokes equations are integrated in time using a subiterating, time-accurate implicit algorithm. Inviscid fluxes are calculated using the Low Diffusion Flux Splitting Scheme of Edwards. A modified version of the dynamic solution-adaptive point movement algorithm of Benson and McRae is used in a coupled mode to dynamically resolve the features of the flow by enhancing the spatial accuracy of the simulations. The unsteady mesh terms are incorporated into the flow solver via the inviscid fluxes. The dynamic solution-adaptive grid algorithm of Benson and McRae is modified to improve orthogonality at the boundaries to ensure accurate application of boundary conditions and properly resolve turbulent boundary layers. Shock tube simulations are performed to ascertain the effectiveness of the algorithm for unsteady flow situations on fixed and moving grids. Unstarts due to a combustor and freestream angle of attack perturbations are simulated in a three-dimensional inlet-isolator-diffuser configuration.
    Web: http://scholar.lib.vt.edu/theses/
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22. Kinetic Studies of Sulfide Mineral Oxidation and Xanthate Adsorption by Neeraj K. Mendiratta
    Sulfide minerals are a major source of metals; however, certain sulfide minerals, such as pyrite and pyrrhotite, are less desirable. Froth flotation is a commonly used separation technique, which requires the use of several reagents to float and depress different sulfide minerals. Xanthate, a thiol collector, has gained immense usage in sulfide minerals flotation. However, some sulfides are naturally hydrophobic and may float without a collector.
    Web: http://scholar.lib.vt.edu/theses/
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23. Simulation Tool and Metric for Evaluating Wireless Digital Video Systems. By Pablo Maximiliano Robert
    Web: http://scholar.lib.vt.edu/theses/
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24. Thermomechanical Postbuckling of Geometrically Imperfect Anisotropic Flat and Doubly Curved Sandwich Panels by Terry J. Hause
    Web: http://scholar.lib.vt.edu/theses/
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25. Performance of a Plasma Torch With Hydrocarbon Feedstocks for Use in Scramjet Combustion by John L. Prebola Jr.
    Web: http://scholar.lib.vt.edu/theses/
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26. Synthesis of Tactical Plans for Robotic Excavation by Sanjiv Singh
    Web:http://www.cmu.edu/
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27. Analysis of the Power Conditioning System for a Superconducting Magnetic Energy Storage Unit by Matthew J. Superczynski
    Web: http://scholar.lib.vt.edu/theses/
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28. Secure Computer Applications in an Enterprise Environment by Tim Lowman. North Carolina University
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29. Applications of Transient Grating Spectroscopy to Temperature and Transport Properties Measurements in High-Pressure Environments by Li, Yuanyuan. North Carolina University
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30. The Synthesis and Photophysical Properties of New Polymetallic Complexes Designed for Use in Photoinitiated Electron Collection by Sumner Weston Jones
    Web: http://scholar.lib.vt.edu/theses/
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31. Two-Loop Controller for Maximizing Performance of a Grid-Connected Photovoltaic-Fuel Cell Hybrid Power Plant by Kyoungsoo Ro
    Web: http://scholar.lib.vt.edu/theses/
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32. Development and Testing of the Virginia Tech Doppler Global Velocimeter (DGV) by Troy B. Jones A new laser based flow interrogation system, capable of simultaneous measurement of planar three-component velocity data, was constructed and tested. The Virginia Tech Doppler Global Velocimeter (DGV) system was designed for use in the Virginia Tech Stability Wind Tunnel as a tool for investigating complex three-dimensional separated flow regions. The system was designed for robustness, ease of use, and for acquisition of low uncertainty velocity data. A series of tests in the Stability Tunnel were conducted to determine how well the new DGV system met these goals. Extensive calibration tests proved the system is capable of measuring the frequency shifts of scattered laser light, and therefore velocity. However, equipment failures and inadequate flow seed density prevented accurate velocity measurements in the separated wake region behind a 6:1 prolate spheroid. Detailed uncertainty analysis techniques demonstrated that, under the proper conditions, the system is capable of making velocity measurements with approximately ±2m s uncertainty.
    Web: http://scholar.lib.vt.edu/theses/
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33. Durability of Advanced Woven Polymer Matrix Composites for Aerospace Applications by Sneha Ramesh Patel
    Web: http://scholar.lib.vt.edu/theses/
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34. Modeling and Analysis of a DC Power Distribution System in 21st Century Airlifters by Konstantin P. Louganski
    A DC power distribution system (PDS) of a transport aircraft was modeled and analyzed using MATLAB/Simulink software. The multi-level modeling concept was used as a modeling approach, which assumes modeling subsystem of the PDS at three different levels of complexity. The subsystem models were implemented in Simulink and combined into the whole PDS model according to certain interconnection rules. Effective modeling of different scenarios of operation was achieved by mixing subsystem models of different levels in one PDS model. Linearized models were obtained from the nonlinear PDS model for stability analysis and control design.
    Web: http://scholar.lib.vt.edu/theses/
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35. Agreement Governing the Activities of States on the Moon and Other Celestial Bodies
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36. Phoenix
    Some aerospace authorities assert that single-stage-to-orbit vehicles are impossible, or are so challenging that they are the functional equivalent of impossible. This paper traces three decades of design work on SSTO concepts and the independent analyses that have judged these various SSTO designs to be entirely achievable. The paper also shows that lightweight structures are the most critical technology involved in SSTOs.which means the advanced composite materials of the 1990s have made the technical case for SSTO feasibility even stronger, compared to the metallic SSTO structures evaluated in the past.
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37. Unknown
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38. Convention on Registration of Objects Launched into Outer Space
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39. Object Shape and Reflectance Modeling from Color Image Sequence by Yoichi Sato
    This thesis describes the automatic reconstruction of 3D object models from observation of real objects. As a result of the significant advancement of graphics hardware and image rendering algorithms, 3D computer graphics capability has become available even on low-end computers. However, it is often the case that 3D object models are created manually by users. That input process is normally time-consuming and can be a bottleneck for realistic image synthesis. Therefore, techniques to obtain object models automatically by observing real objects could have great significance in practical applications.
    Web: http://scholar.lib.vt.edu/theses/
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40. Solar Based Navigation for Robotic Explores by Kimberly J. Shillcutt
    Web:http://www.cmu.edu/
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41. Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies
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42. Development and Applications of Finite Elements in Time Domain by Sungho Park
    A bilinear formulation is used for developing the time nite element method (TFM) to obtain transient responses of both linear, nonlinear, damped and undamped systems. Also the formulation, used in the h-, p- and hp-versions, is extended and found to be readily amenable to multi-degree-of-freedom systems. The resulting linear and nonlinear algebraic equations for the transient response are dierentiated to obtain the sensitivity of the response with respect to various design parameters. The present developments were tested on a series of linear and nonlinear examples and were found to yield, when compared with other methods, excellent results for both the transient response and its sensitivity to system parameters. Mostly, the results were obtained using the Legendre polynomials as basis functions, though, in some cases other orthogonal polynomials namely, Hermite, Chebyshev, and integrated Legendre polynomials were also employed (but to no great advantage). A key advantage of TFM, and the one often overlooked in its past applications, is the ease in which the sensitivity of the transient response with respect to various design parameters can be obtained.
    Web: http://scholar.lib.vt.edu/theses/
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43. Space Tourism: From dream to reality.
    Our first goal was to show the world that space tourism is imminent and will play an important role in expanding future activities in space. Our second goal was to work well enough together to be the first Design Project team to sleep more then 2 hours a night before the deadline. Thirdly, we wanted to contribute something to space tourism that reflected the combined efforts of our diverse, interdisciplinary, and international group. Overall, we hoped the experience could help us create for ourselves a model of what effective international cooperation can be like.
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44. Thermal Thesis:
    Alexander Robert Hanuska, M.S. Virginia Polytechnic Institute and State University, 1998
    Predicting the performance of complex structures exposed to harsh thermal environments is a crucial issue in many of today's aerospace and space designs. To predict the thermal stresses a structure might be exposed to, the thermal properties of the independent materials used in the design of the structure need to be known. Therefore, a noninvasive estimation procedure involving Genetic Algorithms was developed to determine the various thermal properties needed to adequately model the OuterWing Subcomponent (OWS), a structure located at the trailing edge of the High Speed Civil Transport's (HSCT) wing tip.
    Web: http://scholar.lib.vt.edu/theses/
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45. A 60 GHz Uniplanar MMIC 4X Subharmonic Mixer by Michael W. Chapman
    In this modern age of information, the demands on data transmission networks for greater capacity, and mobile accessibility are increasing drastically. The increasing demand for mobile access is evidenced by the proliferation of wireless systems such as mobile phone networks and wireless local area networks (WLANs). The frequency range over which an oxygen resonance occurs in the atmosphere (~58-62 GHz) has received recent attention as a possible candidate for secure high-speed wireless data networks with a potentially high degree of frequency reuse. A significant challenge in implementing data networks at 60 GHz is the manufacture of low-cost RF transceivers capable of satisfying the system requirements. In order to produce transceivers that meet the additional demands of high-volume, mobility, and compactness, monolithic millimeter wave integrated circuits (MMICs) offer the most practical solution.
    Web: http://scholar.lib.vt.edu/theses/
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46. Heim Quantum Theory for Space Propulsion Physics — This paper describes a novel space propulsion technique, based on an extension of a unified field theory in a quantized, higher-dimensional space, developed by the late B. Heim (1977) in the 50s and 60s of the last century, termed Heim Quantum Theory (HQT).
    hqtforspacepropphysicsaip2005.pdf — File Size: 260KB