| Communication System Simulation Workstation |
30 JAN 90 |
33 pages |
| Authors:
Hamed Parsiani; Jorge Cruz-Emeric; PUERTO RICO UNIV MAYAQUEZ DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
 | The two VAX 3100 workstations and softwares arrived by mid December and were installed in a room designated as Advanced Communications Laboratory. The full color Targa 24 board arrived in January 1990. Both VAX operating systems have been loaded, and the BOSS and SPW softwares will be loaded soon by the two paid graduate students recently assigned to this lab. Their priorities are learning the VMS operating system, and the ... |
|
| (DURIP) Two-Processor Alliant FX/4 System |
16 JAN 90 |
9 pages |
| Authors:
C. T. Kelly; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| This proposal requested a two-processor Alliant FX/4 system with disk drives, tape backup, operator's console, and local line printer. This computer offers vector processing capability, a high-speed cache memory, and a shared memory multiprocessing architecture. When the project was funded, Alliant was willing to sell a two-processor FX/40 for the same amount. This system supports research in control and optimization, nonlinear least squared problems, partial differential equations, integral equations, parameter ... |
|
| High Temperature Multiaxial Creep Testing of NIMONIC 115 |
JAN 90 |
14 pages |
| Authors:
L. W. Candler; ROYAL AEROSPACE ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
|
| Materials in present day gas turbine components are known to operate under complex stress situations. In recent years much effort has been devoted to quantifying the state of stress in multiaxial geometries and to studying the deformation and rupture mechanisms involved. Little attention has however been paid to the practical aspects of multiaxial testing and to understanding the material behaviour under complex stress states. A high temperature multiaxial testing facility ... |
|
| Rotor Induced-Inflow-Ratio Measurements and CAMRAD (Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics) Calculations |
JAN 90 |
30 pages |
| Authors:
Danny R. Hoad; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Comparison of the inflow calculations between an analytical rotor- wake method and rotor-inflow measurements using a laser velocimeter has been presented. The inflow measurements were made above a four-bladed rotor system using rectangular planform blades operating in forward flight at a thrust coefficient of 0.0064 and at rotor advance ratios of 0.15, 0.23, and 0.30. The experimental measurements showed that as the advance ratio u increased, the induced-upflow region moved ... |
|
| Improved Algorithms for Transient and Steady-State Fluid-Structure Interaction |
90 |
|
| Authors:
Jerry H. Ginsberg; GEORGIA INST OF TECH ATLANTA
|
 | The interaction between a vibrating submerged structure and the surrounding fluid, which features coupling between the surface pressure distribution and the structural displacement, is an inherent feature for sound radiation and target strength analyses. A variety of approaches have been implemented in the past, but each suffers from serious limitations. Formal mathematical analysis using separation of variables or integral transform techniques is suitable only for the simplest structural models, while ... |
|
| The Validation and Application of a Rotor Acoustic Prediction Computer Program |
90 |
16 pages |
| Authors:
Judith M. Gallman; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
|
| An essential prerequisite to reducing the acoustic detectability of military rotorcraft is a better understanding of main rotor noise which is the major contributor to the overall noise. A simple, yet accurate, Rotor Acoustic Prediction Program (RAPP) has been developed to advance the understanding of main rotor noise. This prediction program uses the Fforwcs Williams and Hawkings (FW-H) equation. The particular form of the FW-H equation used is well suited ... |
|
| Tropical Cyclone Report, 1990 |
90 |
288 pages |
| Authors:
Dieter K. Rudolph; Charles P. Guard; NAVAL OCEANOGRAPHY COMMAND CENTER/JOINT TYPHOON WARNING CENTER FPO SAN FRANCIS CO 96630
|
| This annual publication summarizes tropical cyclone activity in the Western North Pacific Bay of Bengal, Arabian Sea, Western South Pacific and South Indian Oceans. A best track is provided for each significant tropical cyclone. A brief narrative is given for all tropical cyclones in the Western North Pacific and North Indian Oceans. All reconnaissance and fix data used to construct the best tracks can be provided, upon request, on floppy ... |
|
| Geometric Modeling Application Interface Program. System Components Operator's Manual |
90 |
55 pages |
| Authors:
C. Magnuson; C. Van Wie; D. Emmerson; PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
|
| This Operator's Manual describes the system operating commands and software installation procedures for the 3 major system components of the Computer Integrated Manufacturing program known as GMAP (Geometric Modeling Applications Interface Program), U.S. Air Force Contract F33615-85-C-5122. These components are the System Translator, Schema Manager, and Model Access Software with Name Value Interface. Keywords: Geometric modeling applications Interface program, Product definition data interface, Turbine blades and disks. (Author) (kr) ... |
|
| Ocean Engineering Studies. Volume 3. Acrylic Windows. Short-Term Pressurization |
90 |
412 pages |
| Authors:
J. D. Stachiw; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| Volume III of the Ocean Engineering Series is a compilation of four technical reports that focus exclusively on the critical pressures of acrylic windows under short-term pressurization. Three different window shapes are discussed in these reports: flat disc, conical frustum, and spherical shell. Since the structural properties of acrylic plastic are not a function of material thickness, the critical pressures of scale-model acrylic windows described in these reports apply to ... |
|
| Satellite Cloud Analyses: A Nowcasting Capability for the U.S. Navy's TESS(3) |
90 |
3 pages |
| Authors:
C. Crosiar; K. Richardson; G. Haugen; NAVAL ENVIRONMENTAL PREDICTION RESEARCH FACILITY MONTEREY CA
|
| The tactical Environmental Support System, third generation, TESS(3), is the U.S. Navy's newly developed computer workstation for both ashore and afloat sites. The TESS(3) computer system is interfaced to the Navy's Antenna Meteorological Data Receiver-Recorder, AN/SMQ-11. The SMQ-11 acquires satellite data from the Defense Meteorological Satellite Program (DMSP) and the National Oceanic and Atmospheric (NOAA) polar orbiting satellites. Weather facsimile (WEFAX) transmissions from the Geostationary Operational Environmental Satellite (GOES) are ... |
|
| Touchstone Project Mach Port: Milestone Event Q4 |
28 DEC 89 |
23 pages |
| Authors:
Don Cameron; Joel Clark; INTEL CORP BEAVERTON OR INTEL SCIENTIFIC COMPUTERS
|
| The purpose of this report is to describe the porting of the Mach operating system to the Touchstone IOTA prototype. The report describes the major activities associated with the port and the kernel design issues that they brought to our attention. Mach was ported to a small cube of integrated I/O nodes. Drivers for the SCSI disk drive, serial line, and the Direct-Connect hypercube routing hardware were written. Serial communication ... |
|
| Interaction of Electromagnetic Fields with Biosynthetic Processes in Connective Tissue Cells |
DEC 89 |
57 pages |
| Authors:
Alan J. Grodzinsky; Michael D. Buschmann; Yehezkiel A. Gluzband; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF ELECTRICAL ENGINEERING AND COMPU TER SCIENCE
|
| The specific objectives of this research period were (1) determine whether chondrocytes can be maintained in long-term (2-3 months) culture in agarose gel in order to test the effects of chronic as well as acute response to exposure to electromagnetic fields; (2) measure chondrocyte proliferation, biosynthetic rates for proteoglycans and proteins, total accumulation of proteoglycans, and physical properties of agarose/chondrocyte gel cultures; (3) construct specialized chambers for application of electric ... |
|
| CSRD Parallel Service Machine Enhancement |
30 NOV 89 |
9 pages |
| Authors:
David J. Kuck; ILLINOIS UNIV AT URBANA CENTER FOR SUPERCOMPUTING RESEARCH AND DEVELOPMENT
|
| The three major areas in which the Center for Supercomputing Research and Development (CRSD) has performed research involving DOD support are: I) parallel Computer Systems Design Evaluation and Simulation Environment; II) automatic Restructuring and Concurrent Evaluation of Lisp; and III) Parallel Iterative Solver for Sparse Nonsymmetric Linear Systems. This proposal requested funds to procure additional processors for the Cedar computer system (KLSD84). These funds enhanced the research capability of CSRD ... |
|
| Nonlinear Stability in Fluid and Plasma Dynamics |
30 NOV 89 |
5 pages |
| Authors:
J. E. Marsden; CALIFORNIA UNIV BERKELEY DEPT OF MATHEMATICS
|
| Major work on the dynamics of coupled rigid bodies was done. We studied both the case of three coupled rigid bodies in the plane, with a complete stability, bifurcation, and chaotic solutions analysis, but also studied the three dimensional case. In the energy-momentum method, for mechanical systems with Hamiltonian H of the form kinetic energy (K) plus potential (V), a way was found to choose variables that makes the determination ... |
|
| Self-Calibrating Apparatus to Find Dynamic Compressibility of Organic Solids |
29 NOV 89 |
94 pages |
| Authors:
David E. Edmonds; TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
|
| A self-calibrating apparatus has been developed to measure the adiabatic dynamic compressibility of organic solids. The test chamber is a small cavity where bulk cyclic compression is accomplished and monitored with piezoelectric transducers (simple disks). The chamber is different from other chambers of similar design in that it can be re-calibrated at each data point without changing static pressure, opening the chamber, or using a calibration sample. Self-calibration is accomplished ... |
|
| Theoretical Analysis of Microwave and Millimeter Wave Integrated Circuits |
20 NOV 89 |
21 pages |
| Authors:
J. A. Kong; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| The complex resonant frequencies of the open structure of a microstrip antenna consisting of two circular microstrip disks in a three layer stacked configuration have been rigorously calculated as a function of the layered parameters and the ratio of the radii of the two disks. It is shown that for each mode, the stacked circular microstrip structure has dual resonant frequencies which are associated with the two coupled constitutive resonators ... |
|
| Effect of Laser Glare and Aircraft Windscreen on Visual Search Performance Under Low Ambient Lighting |
20 NOV 1989 |
23 pages |
| Authors:
John A. D'Andrea; James C. Knepton; NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
|
| Laser illumination of an aircraft may produce intense glare and degrade visually guided human performance. It is possible that disruption of aircrew performance will occur even at laser glare intensities well below the levels that produce eye damage. However, the degree of disruption of visual performance is probably influenced by a variety of factors, including windscreen characteristics and ambient illumination. To determine the interaction of an aircraft windscreen and low-level ... |
|
| The Response of Helicopter Rotors to Vibratory Airload |
14 NOV 89 |
20 pages |
| Authors:
William G. Bousman; ARMY AVIATION RESEARCH AND TECHNOLOGY ACTIVITY MOFFETT FIELD CA AEROFLIGHTDYN AMICS DIRECTORATE
|
| Structural response data from flight or wind tunnel tests of eight full-scale rotors were examined and compared for high-speed flight conditions and in the absence of blade stall or maneuvers. Both similarities and differences in the behavior of the rotors were observed, and these findings are useful in determining appropriate tests for development of theoretical methods. Limited use is made of airload measurements and theoretical calculation in examining these data. ... |
|
| Fixed Points of Expansive Analytic Maps |
NOV 89 |
|
| Authors:
Walter O. Egerland; Charles E. Hansen; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| It is well-known that non-expansive maps of a closed disk have a fixed point. Expansive maps of a closed disk need not have point. It is shown that an analytic quadratic and expansive map of a closed disk K always has a fixed point in K. (kr) |
|
| Front-End Anti-Viral Detection Mechanisms Using Replicating/Self- Replicating Software |
19 OCT 89 |
41 pages |
| Authors:
Thomas E. Sobczak Jr.; Ralph W. Trickey; APPLICATION CONFIGURED COMPUTERS INC BALDWIN NY
|
| The objectives of Front-End Anti-Viral Detection Mechanism Using Replicating/Self-Replicating Software, are threefold: Research viral mechanisms, anti-viral procedures, and self-replicating software mechanisms for use as security products in MS-DOS and UNIX environments on PCs and Minis. Evaluate the applicability of said mechanisms to protect and/or identify and/or detect computer virus intrusion and corruption within said systems. Begin experimentation with a replicating/self-replicating software product to be used to secure SDIO operating systems, ... |
|
| JPRS Report, China, Science and Technology, Computer Viruses |
10 OCT 1989 |
21 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
|
| Structural Testing and Analytical Research of Turbine Components |
02 OCT 89 |
307 pages |
| Authors:
M. Swaminadham; DAYTON UNIV OH RESEARCH INST
|
| Finite-element based deterministic and probabilistic analytical methods were applied for the normal mode and forced response characterization of simple-to-complex turbine and compressor components. Noncontacting blade deflection instrumentation - - four fiber optic plane-of-light sensors and dual Z-Grid wire systems were designed, built and tested for measuring blade tip deflections of rotating disks. Differential double pulse interferometry was applied for the mode shape definition of rotating bladed disks, and the full- ... |
|
| The Measurement, Modeling and Prediction of Traction for Rocket Propellant 1 |
OCT 89 |
72 pages |
| Authors:
Joseph L. Tevaarwerk; METALS AND CERAMICS INFORMATION CENTER COLUMBUS OH
|
| The bearings used in rocket motor turbopumps are lubricated with the process liquid, no matter whether this is a mineral-based low-viscosity fuel such as RP1, or a cryogenic substance. Thus it is critically important that the rheological properties of the working fluid be known and modeled. Traction tests were performed on RP1, a common kerosene based rocket propellant. Traction data on this fluid are required for purposes of turbopump bearing ... |
|
| Aircraft Reply and Interference Environment Simulator (ARIES) Hardward Principles of Operation. Volume 1 |
OCT 89 |
276 pages |
| Authors:
Edward Mancus; FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ
|
| The Aircraft Reply and Interference Environment Simulator (ARIES) makes possible the performance assessment of the Mode Select (Mode S) sensor under its specific maximum aircraft load. To do this, ARIES operates upon disk files for traffic model and interference to generate simulated aircraft replies and fruit, feeding them to the sensor at radio frequency. Support documentation for ARIES consists of: ARIES Hardware Maintenance Manual: Volume I(DOT/FAA/CT- TN88/3); Appendixes of the ... |
|
| Aircraft Reply and Interference Environment Simulator (ARIES) Hardware Principles of Operation. Volume 2. Appendixes |
OCT 89 |
132 pages |
| Authors:
Edward Mancus; FEDERAL AVIATION ADMINISTRATION TECH- NICAL CENTER ATLANTIC CITY NJ
|
| The Aircraft Reply and Interference Environment Simulator (ARIES) makes possible the performance assessment of the Mode Select (Mode S) sensor under its specific maximum aircraft load. To do this, ARIES operates upon disk files for traffic model and interference to generate simulated aircraft replies and fruit, feeding them to the sensor at radio frequency. Support documentation for ARIES consists of: ARIES Hardware Maintenance Manual: Volume I (DOT/FAA/CT- TN88/3); Appendixes of ... |
|
| Electrochemistry at Very Small Electrodes |
30 SEP 89 |
8 pages |
| Authors:
Janet G. Osteryoung; STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
|
| Microelectrodes have been fabricated as cylinders and as disks or arrays of disks, by employing both conventional and e-beam lithography techniques. Theory has been developed for diffusion to a disk for a variety of electrochemical techniques, especially square wave voltammetry. Cylindrical carbon fiber electrodes have been used as substrates for anodic stripping voltammetry. Small mercury electrodes have been used as tools for investigating anodization reactions in the absence of supporting ... |
|
| Pyramid Development Corporation PC/DACS |
28 SEP 89 |
39 pages |
| Authors:
Kris C. Rogers; Kenneth D. Vane; Myron Coplin; NATIONAL COMPUTER SECURITY CENTER FORT GEORGE G MEADE MD
|
| The National Computer Security Center (NCSC) examines the security protection mechanisms provided by Pyramid's PC/DACS Rel 2. PC/DACS is a subsystem not a complete trusted computer system. Therefore, it was evaluated against the Computer Security Subsystem Interpretation (CSSI). Specifically, the applicable requirements for this evaluation included identification and authentication (I and A), discretionary access control (DAC), audit and object reuse. PC/DACS runs on an IBM, PC, XT or AT or ... |
|
| Geometric Modeling Applications Interface Program (GMAP). Volume 2. Program Description |
SEP 89 |
213 pages |
| Authors:
L. Phillips; K. Perlotto; D. K. Emmerson; P. Blasko; D. Jacobs; PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
|
| This second Volume of the Final Technical Reports summarizes, task- by-task, the technical efforts of the Geometric Modeling Applications Interface Program (GMAP), conducted under U.S. Air Force Contract F33615-85-C-5122. The GMAP Program focused on the computerized generation, control, and exchange of traditional engineering design and manufacturing data. GMAP extended the Product Definition Data Interface Program (PDDI) information model to include computerized support applications for the entire life cycle of a ... |
|
| Geometric Modeling Applications Interface Program (GMAP). Volume 1. Executive Overview |
SEP 89 |
26 pages |
| Authors:
L. Phillips; K. Perlotto; D. K. Emmerson; P. Blasko; D. Jacobs; PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
|
| This first Volume of the Final Technical Report describes the significance and presents a high level overview of the Geometric Modeling Applications Interface Program (GMAP), conducted under U.S. Air Force Contract F33615-85-C-5122. The GMAP Program focused on the computerized generation, control, and exchange of traditional engineering design and manufacturing data. GMAP extended the Product Definition Data Interface Program (PDDI) information model to include computerized support applications for the entire life ... |
|
| Some Comments on Techniques for Resisting Computer Viruses |
SEP 89 |
27 pages |
| Authors:
M. Anderson; ELECTRONICS RESEARCH LAB ADELAIDE (AUSTRALIA)
|
| Essentially, a computer virus is a code fragment which is implanted in a program to alter that program's function. For example assume the existence of some active virus program. The virus first searches for an executable file that is writeable. It then appends a copy of itself to some part of the code section, adds in a jump instruction to the usual entry point of the program, and then modifies ... |
|
| Use of Optical Storage Devices as Shared Resources in Local Area Networks |
SEP 89 |
150 pages |
| Authors:
James C. Hoge; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Since the start of the computer era, information users have been restricted by inadequate and expensive data storage. The development of solid state memory, soft storage media (floppy disk drives), drum memory drives and fixed disk drive mechanisms have improved data storage and retrieval, reducing the cost of information to under $10 per megabyte for large storage devices. The introduction of laser technology and the development of optical data storage ... |
|
| The Effects of Trace Anions on the Voltammetry of Single Crystal Gold Surfaces |
18 AUG 89 |
36 pages |
| Authors:
B. D. Cahan; H. M. Villullas; E. B. Yeager; CASE-WESTERN RESERVE UNIV CLEVELAND OH
|
| The development of a new technique for mounting single crystals as a Hanging Meniscus Rotating Disk (HMRD) electrode has facilitated the study of the effect of traces of anionic impurities on the voltammetry of gold single crystals. It is shown that the cause of most of the differences between voltammetry curves reported in the literature for the same crystal face is the presence in the solution of low levels of ... |
|
| A High Efficiency Fast Neutron Detector |
02 AUG 89 |
24 pages |
| Authors:
R. A. August; G. W. Phillips; J. H. Cutchin; NAVAL RESEARCH LAB WASHINGTON DC
|
| This report researches a concept for a high efficiency detector of fast neutrons (several MeV), using solid state charged particle detectors overlaid with thick disks (about mm) of 238U. Experiments show a significant count rate in our mock-up when exposed to a fast neutron flux, but it appears insensitive to the slow/thermal neutron flux. Our preliminary results indicate a system with an efficiency on the order of at least 5% ... |
|
| The Mobile Combustion Diagnostic Fixture and Its Application to the Study of Propellant Combustion: Part 1. Investigation of the Low Pressure Combustion of LOVA XM39 Propellant |
AUG 89 |
35 pages |
| Authors:
J. O. Doali; Robert A. Fifer; David L. Kruczynski; Bonita J. Nelson; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A Mobile Combustion Diagnostic (MCDF) has been fabricated to investigate the chemical products produced from the combustion of propellants at pressures below 16 MPa. These data are required in order to better understand the combustion phenomenology of propellants at low pressures. The design and capabilities of the MCDF as well as preliminary chemical analysis of nonequilibrium ignition/combustion products using GC and FTIR techniques from hot wire initiated LOVA XM39 propellant ... |
|
| High Energy Product Radially Oriented Toroidal Magnet and Method of Making. |
10 JUL 1989 |
|
| Authors:
Herbert A. Leupold; DEPARTMENT OF THE ARMY WASHINGTON DC
|
| A high energy product radially oriented toroidal magnet is made from an iron cylinder toroid by a method including the steps of: (a) sandwiching the iron cylinder toroid between two disc toroids of a superconductive material at a temperature above the transition temperature of the superconductive material, (b) aligning the iron radially with a small applied field, (c) cooling the superconductive material to below the transition temperature of the superconductive ... |
|
| Human Body Regional Convective Heat Transfer Determination Using Sublimating Naphthalene Disks |
JUL 89 |
22 pages |
| Authors:
K. W. Stephen; Richard R. Gonzalez; Chang Gonzalez; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
|
| The regional convective heat transfer coefficients(hc) on the human body were determined using sublimating naphthalene disks. Circular naphthalene disks were affixed to various body segments of a stationary, life-size manikin, under constant temperature and wind speed in an environmental chamber. The amount of naphthalene weight loss through sublimation was translated to hc using the Chilton-Colburn j-factor analogy between heat and mass transfer. The regional convective heat transfer coefficients can be ... |
|
| Biaxial Flexing of a Fiber-Reinforced Aluminum Composite |
JUL 89 |
23 pages |
| Authors:
Nikos Tsangarakis; Marc S. Pepi; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| Disks of silicon carbide continuous fiber-reinforced (90 DEG)4S aluminum were supported circumferentially on one side and the center of the other side with a pin. maxima principal tensile surface were determined during flexing with strain gages. Failure under monotonic loading initiated on the convex side of the disks with the formation of multiple breaks in the first layer of fibers. With further flexing, cracking extended to inner fiber layers. Finally, ... |
|
| Turbidity in Torres Strait |
JUL 89 |
40 pages |
| Authors:
P. J. Mulhearn; WEAPONS SYSTEMS RESEARCH LAB ADELAIDE (AUSTRALIA)
|
| The turbidity in the eastern half of Torres Strait, along with other relevant variables, was investigated in two oceanographic cruises in early 1988. Turbidity was high and variable and a regression equation has been developed relating Secchi disc depth (and thence underwater visibility range) to water depth and wind speed. This equation covered 71% of the rms variation in Secchi disc depth. Turbidity was approximately constant with depth in weakly ... |
|
| RTSIN1: A Model of a Strapdown INS on a Two-Axis Rate Table |
JUL 89 |
26 pages |
| Authors:
R. B. Miller; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
|
| A two-axis rate table is very useful laboratory equipment for testing of strapdown inertial navigation systems (INS). In practice, tables are used both for angular positioning of the INS and for application of angular velocities about one or two axes. In the former, the INS may be aligned at some required attitude, and then rotated to some other attitude, and left there 'navigating' under the influences of gravity and earth ... |
|
| Applications of the Quartz Crystal Microbalance to Electrochemistry |
29 JUN 89 |
92 pages |
| Authors:
Daniel A. Buttry; WYOMING UNIV LARAMIE DEPT OF CHEMISTRY
|
| The quartz crystal microbalance (QCM) is a piezoelectric device capable of extremely sensitive mass measurements. It oscillates in a mechanically resonant shear mode by application of an alternating, high frequency electric field using electrodes which are usually deposited on both sides of the disk. These devices have been used for many years to measure the masses of thin films in various types of deposition processes. To the extent that the ... |
|
| Defense Data Network X.25 DTE Conformance Test Software Link and Network Layers |
13 JUN 89 |
|
| Authors:
DEFENSE COMMUNICATIONS ENGINEERING CENTER RESTON VA
|
| This software provides the capability to test the conformance of a host communications interface with the Department of Defense's Defense Data Network (DDX.25) (link and network layers) protocols. The host conformance tests are contained on three diskettes; X.25 Link Layer (DTE) test diskette, X.25 Network Layer (DTE) Standard diskette, and X.25 Network Layer (DTE) Basic diskette. This software is executable on a Tekelec Chameleon 32 that uses the MS-DOS operating ... |
|
| Eye/Sensor Protection against Laser Irradiation Organic Nonlinear Optical Materials |
12 JUN 89 |
100 pages |
| Authors:
Michael E. Boyle; Robert F. Cozzens; NAVAL RESEARCH LAB WASHINGTON DC
|
| Recent developments in organic nonlinear optical materials for application to eye and sensor protection are reviewed. This compendium includes a brief discussion of the functioning of the eye, delineation of some of the important eye protection parameters and an introduction to the origin of nonlinear optical effects and how they are measured. Specific examples of proposed or prototyped protection devices are also presented. A compilation of noteworthy organic third-order nonlinear ... |
|
| Database Creation and/or Reorganization Over Multiple Database Backends |
JUN 89 |
102 pages |
| Authors:
Deborah A. McGhee; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| To create a record in a database, one uses the INSERT command. However, in the Multi-Backend Database System (MBDS), the insert command only inserts one record at a time. When creating very large databases consisting of thousands or millions of records, the use of the INSERT command is a time- consuming process. Once a database is created, some of the records of the database may be tagged for deletion. MBDS ... |
|
| An Expert System in C for Computer-Aided Digital Circuit Design |
JUN 89 |
|
| Authors:
Jorge S. Santos; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This thesis effort documents the design, development, implementation, and test of an expert system which decomposes digital circuits into subproblems in order to detect wiring errors, which consist of improperly connected gates, missing connections, and violation of fanout or race conditions. Information needed to connect chips together is viewed as knowledge base information for the expert system. Information such type as number of pins, value of each pin (input, output, ... |
|
| Wind Tunnel Tests of a 20-Gore Disk-Gap-Band Parachute |
28 MAY 89 |
64 pages |
| Authors:
William P. Ludtke; NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
|
| This report documents wind tunnel tests of a series of 20 gore Disk- Gap-Band parachutes to determine the effects of gap length, band billow, and cloth air permeability on the parachute aerodynamic characteristics. Measurements for the steady-state drag-force, opening shock force, oscillation stability, and inflation stability were made of the various configurations and are presented in tabular and graphical format. Keywords: Disk gap-band- parachutes; Stability; Parachute technology; Opening shock; Design ... |
|
| Turbine Blade Data Acquisition System Software Reference |
MAY 89 |
84 pages |
| Authors:
M. J. Gutman; DAYTON UNIV OH RESEARCH INST
|
| This report contains design and technical documentation on magnetic tape format, master and slave program software, and the simulator EPROM listings for the noncontacting stress measurement system. This system is used as an analytical tool for structural testing and research on bladed disk components. The data acquisition software is used to control the operation of the signal storage and processing electronics. Keywords: Turbine blades, Forced response, Bladed disk, Dynamic structural ... |
|
| Low Frequency Structureborne Vibration Isolation Mount. |
11 APR 1989 |
|
| Authors:
Valentino N. Fazi Jr.; Ronald G. Murdock; Ernest O. Hancock; John W. McGready; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A low frequency structureborne vibration isolation mount includes an annular disk pad of vibration damping material which is sandwiched and bonded between two similar light but rugged annular disks. The annular disk pad and the two annular disks have equal number of matching and corresponding holes along the circumferences thereof. The sizes of the holes are so chosen that one of the annular disks can be secured to the moving ... |
|
| Theoretical Analysis of Microwave and Millimeter Wave Integrated Circuits Based on Magnetic Films |
31 MAR 89 |
|
| Authors:
J. A. Kong; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| The complex resonant frequencies of the open structure of a microstrip antenna consisting of two circular microstrip disks in a three layer stacked configuration have been rigorously calculated as a function of the layered parameters and the ratio of the radii of the two disks. Using a dyadic Green's function formulation for horizontally stratified media and the vector Hankel transform, the mixed boundary value problem is reduced to a set ... |
|
| Advanced Tribological Coatings for High Specific Strength Alloys |
29 MAR 89 |
3 pages |
| Authors:
UKAEA RISLEY NORTHERN RESEARCH LABS (UNITED KINGDOM)
|
| It is intended to select the most promising surface treatments from this study and arrange coating of rolling contact, fatigue and pin/disc tribometer specimens to evaluate their friction, wear and fatigue properties. |
|
| Optical Image Recognition Using Acoustooptic and Charge Coupled Devices |
05 MAR 89 |
120 pages |
| Authors:
Demetri Psaltis; CALIFORNIA INST OF TECH PASADENA
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| Optical image recognition systems based on optical correlators and distributed holographic interconnections are described and experimentally demonstrated. Correlators which rely on acoustooptic devices, optical disks, photorefractive crystals, and charge coupled devices are described. The capacity for information storage of such correlators is derived. The capacity of volume holograms for high spatial density information storage is derived. The use of photorefractive volume holograms in artificial neural networks is described and demonstrated. ... |
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Reports by Keyword(s)
DISKS
