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Defense Technical Information Archive
by Defense Technical Information Center
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This memorandum is concerned primarily with a second evaluation of data reported by the Narragansett Bay Marine Laboratory. The data itself are related to their work on the sediments of Narragansett Bay. The physical parameters of interest to our problems are densities of the sediments and their porosities. The densities are bulk densities in the dry state and in situ. The porosity we are concerned with is the ratio of the voids, presumably filled with water, to the wet bulk volume. These...
Topics: DTIC Archive, Cole,Donald L, NAVY UNDERWATER SOUND LAB NEW LONDON CONN, *SOIL MECHANICS,...
Defense Technical Information Archive
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This report describes work performed in support of the AFGL program to study atmospheric turbulence and obtain the Atmospheric Optical Structure Constant, C cub N squared. Data is obtained from a thermosonde unit and a radiosonde unit carried aloft by small weather balloons. Improvements in the thermosonde unit and modifications to the radiosonde unit are described. (Author)
Topics: DTIC Archive, Hills,Robert S, TRI-CON ASSOCIATES INC CAMBRIDGE MA, *TURBULENCE, *ATMOSPHERIC...
Temperature structure in the North Atlantic and Indian Oceans is presented in monthly mean charts at 100-ft (30-m) depths, surface to 492 ft (150 m). These charts were constructed from bathythermograph (BT) data obtained from 1941 to 1970, hydrocast data, means extracted from published charts, and unpublished tabulations of means. The charts were traced from computer-generated plots made directly from 1 deg quadrangle temperature means. Annual cycle temperature curves, at 10-deg longitude and...
Topics: DTIC Archive, Robinson,Margaret K, NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS, *TEMPERATURE,...
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Defense Technical Information Archive
by Defense Technical Information Center
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Contents: Sound speed profiles, Refraction, Acoustic paths, Divergence loss theory, Divergence loss applications, Attenuation, Reflection losses, Computation of total loss, Wave equation, Wave guides, Wave guide in cylindrical coordinates, Reflection coefficient, Wave guide modification, Two- layer wave guide, Normal mode theory, Leakage from surface ducts, and WKB method.
Topics: DTIC Archive, Saxton, H. L., TRACOR INC ROCKVILLE MD, *SONAR, *SOUND TRANSMISSION, *UNDERWATER...
Defense Technical Information Archive
by Defense Technical Information Center
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The existing studies of the acoustic and physical properties of bottom sediments were summarized. The computation of the impedance, reflection coefficient, and the reflection loss for each of the sediments, as well as the graphic presentation, represents the original material. The information may be useful to those interested in bottom reflection and its application to bottom bounce sonar.
Topics: DTIC Archive, Winokur,Robert S, NAVAL OCEANOGRAPHIC OFFICE WASHINGTON D C MARINE SCIENCES DEPT,...
Defense Technical Information Archive
by Defense Technical Information Center
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Partial contents: North Atlantic Oceanography; Development of Instruments--Unattended instruments and Recovery Program; Model Studies Oceans; Arctic Oceanography; and Thermocline Studies.
Topics: DTIC Archive, WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS, *OCEANOGRAPHY, OCEAN WAVES, SALINITY,...
Defense Technical Information Archive
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An intensive Nansen cast survey of a one-degree square in the Western North Atlantic (25 Oct - 11 Nov 1963) revealed significant variations in the distribution of properties. A definite pattern of fine structure of the properties was revealed in the upper 500 meters of the water column. Comparison of such a structure with historical BT data suggests the possibility of the Antilles Current being more important in heat exchange processes in the upper strata than the energy exchange through...
Topics: DTIC Archive, Johnson,Roland E, NAVAL OCEANOGRAPHIC OFFICE WASHINGTON D C MARINE SCIENCES DEPT,...
This is the fourth in a series of technical memoranda dealing with environmental data obtained during Project EARS Cruise I (28 October-13 December 1966). This memorandum deals specifically with the observations of scattering layers made during the cruise at 12.0 KHz with the standard ship's fathometer. The results of biological sampling conducted at a number of locations along the track, are presently being analyzed in order to identify organisms present, and will be reported separately in USL...
Topics: DTIC Archive, Hull,Donald A, NAVY UNDERWATER SOUND LAB NEW LONDON CONN, *OCEANOGRAPHIC DATA,...
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Department of Defense
by Burke, Robert E.
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Thesis (MS)--Massachusetts Institute of Technology, 1955
Topic: Mechanical engineering
Department of Defense
by Raycraft, Janet K.;Kelleher, Matthew D.;Yang H. Q.;Yang K. T.
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Copy 1 and copy 3 has subtitle "Final report for period October 1987-July 88."
Topic: CARBINOLS.,FIRES.,MODELS.,NUMERICAL ANALYSIS.,PRESSURE VESSELS.
Defense Technical Information Archive
by Defense Technical Information Center
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A collection of more than thirty case studies is presented covering a wide range of practical engineering applications of fracture mechanics to design, inspection, maintenance, and failure analysis. The case studies are written by individual specialists within industry, government, and academia from the United States and Great Britain. The collection is divided into five sections corresponding to (1) Aerospace, (2) Joints and Mountings, (3) Pressure Vessels and Rotating Machinery, (4) Surface...
Topics: DTIC Archive, Rich, Thomas P, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA,...
The purpose of this report is to synthesize technological concepts of fracture by making a historical review of the literature from 1913 up to the present time. The pertinent aspects of fracture and the development of relevant concepts of linear elastic fracture mechanics derivatives were delineated and summarized for the prediction of the critical length of fatigue cracks. The pertinent aspects of fracture consisted of the synthesis of Ingliss, Griffith, Orowan, Irwin, and Westergaard's...
Topics: DTIC Archive, Davis, Sidney O, AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH,...
Books to Borrow
by Levinson, Norman, 1912-; Redheffer, Raymond M., joint author
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Includes bibliographical references
Topics: Functions of complex variables, Mathematical analysis
Books to Borrow
by Levinson, Norman, 1912-
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246 p. 26 cm
Topics: Fourier series, Functions of complex variables, Functions, Exponential, Harmonic analysis, Integral...
Books to Borrow
by Paley, Raymond Edward Alan Christopher, 1907-1933
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viii, 184 p. :
Topics: Fourier series, Functions, Exponential, Functions, Harmonic analysis, Integral equations
Books to Borrow
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Topics: Differential equations, Functions of complex variables
Defense Technical Information Archive
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The report summarizes the state of the art in the field of explosion- generated waves, their generation, propagation and their effects on coastal environment.
Topics: DTIC Archive, Van Dorn, William G, TETRA TECH INC PASADENA CA, *WATER WAVES, *UNDERWATER...
Defense Technical Information Archive
by Defense Technical Information Center
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General Goal: To develop accurate and efficient numerical models of the acoustic propagation problem. The main considerations were: long range propagation, short range propagation, one-way outgoing or incoming (no backscatter -PE's), two-way (backscatter - Elliptics), and liquid/solid interface. General Approach: To model physical phenomena using partial differential equations and to apply modern numerical methods of scientific computing to their solution. The main considerations were:...
Topics: DTIC Archive, St Mary, Donald F, MASSACHUSETTS UNIV AMHERST DEPT OF MATHEMATICS AND STATISTICS,...
Defense Technical Information Archive
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A symposium on Acoustics Research in the Arctic was held. This paper presents a broad view of current problems in the Arctic. Problems fall into five areas, each of which are discussed: lack of stated requirements in the Arctic; interference between projects; power sources; services; and funding.
Topics: DTIC Archive, Davidson, James B, OFFICE OF NAVAL RESEARCH ARLINGTON VA, *ACOUSTICS, *SYMPOSIA,...
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Naval Postgraduate School
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The traditional study of underwater explosions (UNDEX) with respect to ship damage became of interest during World War II when torpedo explosions near a ship created more damage than a direct hit. Following the war, many full scale ship shock trials were conducted that provided much of the empirical data that is used in the field today. However, one type of shock phenomena became of interest in the late 1960s that potentially could be more damaging than a typical underwater explosion; an...
Topic: Underwater explosions
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Topics: DTIC Archive, OFFICE OF NAVAL RESEARCH ARLINGTON VA, *UNDERWATER EXPLOSIONS, *EXPLOSION BUBBLES,...
Defense Technical Information Archive
by Defense Technical Information Center
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Observations of binary stars are the bread-and-butter for optical interferometers. An easy exploit for the unrivaled angular resolution of long baseline interferometers, the measurement of the orbits of double-lined spectroscopic binaries affords the determination of fundamental parameters of stars as well as their distance from Earth. Interferometry thus extends the reach of using spectroscopic binaries to non-eclipsing pairs, as a special but unlikely geometry for seeing eclipses, which also...
Topics: DTIC Archive, NAVAL OBSERVATORY FLAGSTAFF AZ, *INTERFEROMETERS, *OPTICAL INTERFEROMETERS,...
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Topics: DTIC Archive, OFFICE OF NAVAL RESEARCH ARLINGTON VA, *SYMPOSIA, *EXPLOSIONS, *DETONATIONS, FIBER...
Defense Technical Information Archive
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Topics: DTIC Archive, URICK, R. J., OFFICE OF NAVAL RESEARCH ARLINGTON VA, *DISPLAY SYSTEMS, *SONAR,...
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The United States' Office of Naval Research (ONR) is investigating a wide variety of methods to improve human performance. ONR's Force Health Protection program includes an emphasis on physically and psychologically prepared forces for enabling human performance enhancement. Efforts to develop psychological resilience are ongoing through identification of individuals at greatest risk for developing stress-based psychological disorders via personality and cognitive characteristics, identifying...
Topics: DTIC Archive, OFFICE OF NAVAL RESEARCH ARLINGTON VA, *MILITARY OPERATIONS, *PERFORMANCE(HUMAN),...
NASA Technical Documents
by Chudov, L. A.; Roslyakov, G. S
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Numerical methods in gas dynamics - computation techniques for steady gas flow, boundary layer, viscous flow, and seepage problems
Topics: BOUNDARY LAYER FLOW, VISCOUS FLOW, BOUNDARY LAYER, COMPUTATION, GAS DYNAMICS, GAS FLOW, U.S.S.R.,...
Characteristic method for numerical solution of one-dimensional flow problems in gas dynamics
Topics: COMPUTATIONAL FLUID DYNAMICS, ONE-DIMENSIONAL FLOW, FLUID DYNAMICS, GAS DYNAMICS, METHOD OF...
NBS/NIST Technical Notes
by McSparron, Donald A.; Mohan, K.; Raybold, R. C.; Saunders, R. D.; Zalewski, E. F.
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Topics: Radiation., Photometry.
NASA Technical Documents
by Teyfel, V. G
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Spectroscopic observation and spectral analysis of astronomical data on planetary atmosphere, lunar surface and radio emission
Topics: ASTRONOMY, PLANETARY ATMOSPHERE, RADIO EMISSION, SPECTRAL ANALYSIS, LUNAR SURFACE, MARS SURFACE,...
Department of Defense
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Thesis advisor(s): Ligrani, Phillip M
Topic: Turbines,Turbomachines,Efficiency,Thermal stresses,Turbulent boundary layer,Mechanical engineering
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Defense Technical Information Archive
by Defense Technical Information Center
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The research in thermal stresses in delta wings is continued. Equations of first approximation for the skew-symmetric temperature part are derived and solved. A numerical example is given. Then the equations of second (and final) approximation are obtained and solved for both the symmetric and the skew-symmetric part. The numerical example is continued into the second approximation.
Topics: DTIC Archive, Parkus, H, TECHNISCHE HOCHSCHULE VIENNA (AUSTRIA), *DELTA WINGS, *THERMAL STRESSES,...
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NASA Technical Documents
by Rubashev, B. M
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Solar activity - interior radiation field and manifestations in earth and planetary atmospheres
Topics: EARTH ATMOSPHERE, PLANETARY ATMOSPHERE, RADIATION FIELD, SOLAR ACTIVITY, What -- Earth,...
NASA Technical Documents
by Koval, I. K
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Photometric and polarimetric studies of Mars and Venus atmospheres - aerosols
Topics: AEROSOLS, VENUS, MARS (PLANET), PHOTOMETRY, PLANETARY ATMOSPHERES, PLANETS, POLARIMETRY, VENUS...
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NASA Technical Documents
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The Titan/Centaur-1 is evaluated in support of the mission objectives. Titan, Centaur, and Centaur standard shroud systems are described, and their performance are evaluated.
Topics: IRON METEORITES, SHOCK RESISTANCE, METAMORPHISM (GEOLOGY), METEORITIC COMPOSITION, SILICATES,...
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NASA Technical Documents
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Use of magnetohydrodynamics during high speed reentry
Topics: DECELERATION, HIGH SPEED, MAGNETOHYDRODYNAMICS, REENTRY, REENTRY PHYSICS, HIGH SPEED FLYING,...
Books to Borrow
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xiii, 585 p. : 25 cm
Topics: Hydrodynamics, Magnetohydrodynamics, Plasma (Ionized gases), Plasma stability
Books to Borrow
by Chandrasekhar, S. (Subrahmanyan), 1910-
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xx, 587 p. : 25 cm
Topic: Relativistic astrophysics
The purpose of this paper is to investigate the acceleration performance of a disk-shaped magnetohydrodynamics (MHD) accelerator and discuss its MHD acceleration effect. Quasi-1-dimensional (Q1D) numerical simulation employing the MacCormack scheme was developed. For shorter channel lengths, thermal loss can be reduced below 20 % owing to the smaller heat and the friction losses. However, too short channel length, accelerator performance was decreased by the MHD compression due to too large...
Topics: Magnetohydrodynamics, Numerical Simulation, Air-plasma, Disk-shaped
NASA Technical Documents
by Artsimovich, L. A
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Hot plasma physics - controlled thermonuclear fusion and magnetohydrodynamics
Topics: CONTROLLED FUSION, HIGH TEMPERATURE PLASMAS, MAGNETOHYDRODYNAMICS, PLASMA PHYSICS, THERMONUCLEAR...
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No Abstract Available
Topics: MAGNETOHYDRODYNAMICS, RELATIVISTIC THEORY, EULER EQUATIONS OF MOTION, MATHEMATICAL MODELS
No Abstract Available
Topics: DENSITY (MASS/VOLUME), GAS EXPLOSIONS, NONLINEARITY, VARIABILITY, ONE DIMENSIONAL FLOW, SHOCK...
Complex streamwise vorticity fields are observed in the evolution of non-circular jets. Generation mechanisms are investigated via Reynolds-averaged (RANS), large-eddy (LES) and direct numerical (DNS) simulations of laminar and turbulent rectangular jets. Complex vortex interactions are found in DNS of laminar jets, but axis-switching is observed only when a single instability mode is present in the incoming mixing layer. With several modes present, the structures are not coherent and no...
Topics: NASA Technical Reports Server (NTRS), JET FLOW, LAMINAR FLOW, REYNOLDS AVERAGING, REYNOLDS...
This slide presentation reviews the Large Eddy Simulation of a high reynolds number Coanda flow that is separated from a round trailing edge of a ciruclation control airfoil. The objectives of the study are: (1) To investigate detailed physics (flow structures and statistics) of the fully turbulent Coanda jet applied to a CC airfoil, by using LES (2) To compare LES and RANS results to figure out how to improve the performance of existing RANS models for this type of flow.
Topics: NASA Technical Reports Server (NTRS), LARGE EDDY SIMULATION, CIRCULATION CONTROL AIRFOILS, COANDA...
NASA Technical Documents
by Glaessgen, E. H.; Piascik, R. S.; Raju, I. S.; Harris, C. E
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Nanocrystalline metals have very high theoretical strength, but suffer from a lack of ductility and toughness. Therefore, it is critical to understand the mechanisms of deformation and fracture of these materials before their full potential can be achieved. Because classical fracture mechanics is based on the comparison of computed fracture parameters, such as stress intlmsity factors, to their empirically determined critical values, it does not adequately describe the fundamental physics of...
Topics: TURBULENT FLOW, MATHEMATICAL MODELS, TENSORS, ISOTROPY
Defense Technical Information Archive
by Defense Technical Information Center
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The main effort in this project has been directed towards the development of an integrated vision system, - the Vision Machine - based on a parallel supercomputer. The core of the Vision Machine is in fact a set of parallel algorithms for visual recognition and navigation in an unstructured environment. The present version of the Vision Machine has been demonstrated to process images in close to real time by (1) computing first several low-level cues, such as edges, stereo disparity, optical...
Topics: DTIC Archive, Poggio, Tomaso, MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB,...
Defense Technical Information Archive
by Defense Technical Information Center
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The time period covered is the second year that we have had the Connection Machine (CM) Available to us. During the same period of time, we successfully demonstrated the Vision Machine system processing images and recognizing objects through the integration of several visual cues. The first version of the Vision Machine system, which is based on the CM and uses an Eye-Head robot as an input device, is now complete and functional. In parallel with the development of the Vision Machine, we have...
Topics: DTIC Archive, Poggio, Tomaso, MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB,...
Defense Technical Information Archive
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In an earlier communication (dealing with flow in curved pipes) a numerical procedure capable of calculating variable property flows in arbitrary curvilinear orthogonal coordinates was reported. Convective and diffusive base vector variation source terms appearing in the differential momentum equation were tabulated but their derivation was not described. In addition, and because of the cases studied, only brief mention was made with regard to the extra source terms arising in variable property...
Topics: DTIC Archive, Humphrey,Joseph A C, PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES,...
Defense Technical Information Archive
by Defense Technical Information Center
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The authors introduce a new type of method for unconstrained optimization, which we call a tensor method. It is related in its basic philosophy to the tensor methods for nonlinear equations of Schnabel and Frank, but beyond that the methods have significant differences. The tensor method for unconstrained optimization bases each iteration upon a fourth order model of the objective function. This model consists of the quadratic portion of the Taylor series, plus low rank third and fourth order...
Topics: DTIC Archive, Schnabel, Robert B, COLORADO UNIV AT BOULDER DEPT OF COMPUTER SCIENCE, *OPTIMIZATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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A new class of methods for solving systems of nonlinear equations, called tensor methods, is introduced. Tensor methods are general purpose methods intended especially for problems where the Jacobian matrix at the solution is singular or ill-conditioned. They base each iteration on a quadratic model of the nonlinear function, the standard linear model augmented by a simple second order term. The second order term is selected so that the model interpolates function values from several previous...
Topics: DTIC Archive, Schnabel,Robert B, COLORADO UNIV AT BOULDER DEPT OF COMPUTER SCIENCE, *NONLINEAR...
Defense Technical Information Archive
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Precise calculation of molecular electronic wavefunctions by methods such as coupled-cluster requires the computation of tensor contractions, the cost of which has polynomial computational scaling with respect to the system and basis set sizes. Each contraction may be executed via matrix multiplication on a properly ordered and structured tensor. However, data transpositions are often needed to reorder the tensors for each contraction. Writing and optimizing distributed-memory kernels for each...
Topics: DTIC Archive, CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES,...
Defense Technical Information Archive
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The goal of this research was to study the computational issues involved in constructing an accurate, efficient and flexible computational framework for the modeling of supersonics reactive flows, and to apply the methods thus developed to problems originated from the Air-Force labs. The main components of this framework are: High order accuracy numerical methods are applied in order to resolve the important detailed features of the flow. Spectral multi-domain methods. Weighted Essentially Non...
Topics: DTIC Archive, Gottlieb, David, BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS, *NUMERICAL...
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Defense Technical Information Archive
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This research examined the nature of courageous performance and ways in which it can be promoted. The practical objective was to develop methods for predicting courageous performance. Military personnel who perform hazardous duties were studied before and after training, during operational duties, and under laboratory stress. Various measures were used to assess their behavior, subjective reactions, and psychophysiological responses. The bulk of the research was carried out on military...
Topics: DTIC Archive, Rachman, Stanley J, BRITISH COLUMBIA UNIV VANCOUVER DEPT OF PSYCHOLOGY, STRESSES,...
Defense Technical Information Archive
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This paper reviews the general psychology literature related to handedness and cerebral laterality, beginning with a brief discussion of the research methods employed. Aspects of laterality, including vision, audition, tactile perception, spatial ability, and language are reviewed, as well as theories of cerebral dominance patterns. The handedness literature is examined, with attention to measurement, theories of genesis, sociocultural factors, and sex differences. There are many postulated...
Topics: DTIC Archive, Crowley, John S, SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX, *HEMISPHERES, *CEREBRUM,...
This briefing discusses methodology and preliminary findings focused on the application of multi-level modeling techniques to distinguish effects of sleep loss and task demands on individual and team C4ISR decision making, coordination, and performance over time. We focus our efforts on measurement and modeling. First, we describe aspects of C4ISR scenario development, to ensure (a) psychological fidelity and operational relevance, (b) elicitation and assessment of performance constructs of...
Topics: DTIC Archive, Barnes, Christopher, AIR FORCE RESEARCH LAB SAN ANTONIO TX WARFIGHTER FATIGUE...
Defense Technical Information Archive
by Defense Technical Information Center
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Topics: DTIC Archive, ROSHKO, ANATOL, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC,...
An expansion of a function initially given in 1deg cells was carried out to degree 360 by using 30'cells whose value was initially assigned to be the value of the 1deg cell in which it fell. The evaluation of point values of the function from the degree 360 expansion revealed spurious patterns attributed to the coefficients from degree 181 to 360. Expansion of the original function in 1deg cells to degree 180 showed no problems in the point evaluation. Mean 1deg values computed from both degree...
Topics: NASA Technical Reports Server (NTRS), FUNCTIONS (MATHEMATICS), GRAVITY ANOMALIES, COEFFICIENTS,...
Defense Technical Information Archive
by Defense Technical Information Center
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A real-time ship simulation investigation of the proposed designs for deepening and narrowing the navigation channel for Grand Haven Harbor, Michigan, was conducted. The purpose of the study was to determine if the navigation channel could be deepened from 21 to 27 ft and narrowed from the existing 300 ft to 225 ft and maintain adequate safety. A numerical model of the existing channel from Lake Michigan to the supper limit of the maintained channel was developed. The numerically generated...
Topics: DTIC Archive, McCollum, Randy A, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS...
Defense Technical Information Archive
by Defense Technical Information Center
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The behavior of an interlaminar defect in a Hercules As/3501-6 graphite-epoxy (Gr/E) laminated beam subjected to flexural fatigue was investigated. Interlaminar defects were simulated by various sizes of Teflon disbonds implanted within the beam at the midsurface. Static flexural tests resulted in specimen flexure failure modes while fatigue loading produced stable interlaminar propagation of the defects due to the action of interlaminar shear stresses. Ultrasonic C-scan techniques were used to...
Topics: DTIC Archive, DiMondi, Vincent, DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS, *LAMINATES,...
This report describes the first part of a three year study to identify the factors that determine the effectiveness of sonar and target motion analysis (TMA) operators in United States Navy (USN) and UK Royal Navy (RN) submarines. The aim of the programme is to highlight best practice in operator performance in a way that will contribute to training effectiveness. This report describes the progress made by the UK in preparing and conducting a cognitive task analysis of sonar operators.
Topics: DTIC Archive, Hardinge, Neil M, DEFENCE EVALUATION AND RESEARCH AGENCY FARNBOROUGH (UNITED...
A ship computer simulation study for Houston-Galveston Navigation Channels, TX, is performed. The study includes existing conditions and two proposed channel widths. The primary design question is related to ships meeting and passing in the narrow channels. Recommendations are made concerning channel width. Houston-Galveston Navigation Channels, Ship navigation simulation, Ships meeting and passing.
Topics: DTIC Archive, Hewlett, J C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS, *SHIPS, *SHIP...
Defense Technical Information Archive
by Defense Technical Information Center
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Surface Ship Shock trials play an essential rule in ship test and evaluation (T&E), and Live Fire Test and Evaluation (LFT&E) requirements for the lead ship of each new construction shock hardened ship class. These tests provide insight into platform vulnerabilities with respect to close proximity underwater explosion (UNDEX) events. The high cost of conducting ship shock trials has lead to a significant effort to develop modeling and simulation capabilities that can provide...
Topics: DTIC Archive, Malone, Philip E, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *VIBRATION, *NAVAL VESSELS,...
Defense Technical Information Archive
by Defense Technical Information Center
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Chemical kinetic modelers make extensive use of shock tube ignition data in the development and validation of combustion reaction mechanisms. These data come from measurements using a range of diagnostics and a variety of shock tubes, fuels, and initial conditions. With the wide selection of data available, it is useful to realize that not all of the data are of all the same type or quality, nor are all the data suitable for simple, direct comparison with the predictions of reaction mechanisms....
Topics: DTIC Archive, Davidson, D F, STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING, *IGNITION, BOUNDARY...
Defense Technical Information Archive
by Defense Technical Information Center
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Two numerical approaches to the problem of theoretically predicting closure pulses produced by bulk cavitation are reviewed: a single-stage, finite- difference approach based directly on the governing differential equations of hydrodynamics and a multi-stage approach which assumes several different simplified formulations of the governing equations at different times during the bulk cavitation process. New extensions to both current approaches are reported by the author and used to solve an...
Topics: DTIC Archive, Clark, Joseph A, CATHOLIC UNIV OF AMERICA WASHINGTON DC ACOUSTO-OPTICS LAB,...
Defense Technical Information Archive
by Defense Technical Information Center
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This technological bibliography provides a systematic accounting of Lighter-Than-Air (LTA) documents. This report should enable rapid review of past and present activities for specific individual applications. Both author and subject indices are included.
Topics: DTIC Archive, Bailey, David B., NAVAL AIR DEVELOPMENT CENTER WARMINSTERPA AIRCRAFT AND CREW SYSTEMS...
Books to Borrow
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"In 2005-06, Julie Angus rowed nearly 10,000 kilometres across the Atlantic Ocean, becoming the first woman in the world to voyage across it from mainland to mainland in a rowboat."--P. [4] of cover
Topics: Angus, Julie, Angus, Julie, Angus, Julie, Boats and boating, Marine ecology, Rowers, Adventure and...
Books to Borrow
by Eisenhart, Luther Pfahler, b. 1876
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x, 304 p. : 24 cm
Topics: Calculus of tensors, Geometry, Differential
Defense Technical Information Archive
by Defense Technical Information Center
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A wake is modelled by a vortex sheet carrying positive and negative circulation. The sheet's evolution is computed by the vortex-blob method. Initial conditions and circulation density for the vortex sheet are chosen to simulate some of the wake patterns observed in the soap-film experiments of Couder et.al.(2,3).
Topics: DTIC Archive, Krasny, Robert, MICHIGAN UNIV ANN ARBOR DEPT OF MATHEMATICS, *VORTICES, *WAKE,...
Arxiv.org
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I propose a variational approach to maximum pseudolikelihood inference of the Ising model. The variational algorithm is more computationally efficient, and does a better job predicting out-of-sample correlations than $L_2$ regularized maximum pseudolikelihood inference as well as mean field and isolated spin pair approximations with pseudocount regularization. The key to the approach is a variational energy that regularizes the inference problem by shrinking the couplings towards zero, while...
Topics: Statistics, Statistical Mechanics, Computing Research Repository, Machine Learning, Learning,...
Source: http://arxiv.org/abs/1409.7074
Naval Postgraduate School
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Motivation to expand the understanding of a helicopter rotor descending into the vortex ring state (VRS) stems from the aircraft mishaps that have plagued the helicopter community. The V-22 has become the most recent victim of encounters with VRS. The onset of VRS is associated with the collapse of the helical vortex wake in the plane of the rotor. The resulting wake disturbances develop an irregular and aperiodic flow. Rotor blade interaction with the disturbed vortices causes large variations...
Topics: Vortex-motion, Vibration (Aeronautics)
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Cryogenic fluids play an important role in space transportation. Liquid oxygen and hydrogen are vital fuel components for liquid rocket engines. It is also difficult to accurately measure the liquid level in the cryogenic tanks containing the liquids. The current methods use thermocouple rakes, floats, or sonic meters to measure tank level. Thermocouples have problems examining the boundary between the boiling liquid and the gas inside the tanks. They are also slow to respond to temperature...
Topics: NASA Technical Reports Server (NTRS), CRYOGENIC FLUIDS, OPTICAL MEASURING INSTRUMENTS,...
Arxiv.org
by Yannick Meier; Jie Xu; Onur Atan; Mihaela van der Schaar
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To increase efficacy in traditional classroom courses as well as in Massive Open Online Courses (MOOCs), automated systems supporting the instructor are needed. One important problem is to automatically detect students that are going to do poorly in a course early enough to be able to take remedial actions. Existing grade prediction systems focus on maximizing the accuracy of the prediction while overseeing the importance of issuing timely and personalized predictions. This paper proposes an...
Topics: Computing Research Repository, Learning
Source: http://arxiv.org/abs/1508.03865
The Library of Congress
by Bush, Vannevar, 1890-1974; Conant, James Bryant, 1893-1978; Hazen, Harold L. (Harold Locke), 1901-1980; United States. Office of Scientific Research and Development. National Defense Research Committee. Division 7, issuing body; Columbia University. Division of War Research. Summary Reports Group, organizer
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Title on half title page: Summary technical report of the National Defense Research Committee
Topics: Fire control (Aerial gunnery), Military research, Fire control (Aerial gunnery), Military research
Arxiv.org
by Damiano Caprioli
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We present the results of large hybrid (kinetic ions - fluid electrons) simulations of particle acceleration at non-relativistic collisionless shocks. Ion acceleration efficiency and magnetic field amplification are investigated in detail as a function of shock inclination and strength, and compared with predictions of diffusive shock acceleration theory, for shocks with Mach number up to 100. Moreover, we discuss the relative importance of resonant and Bell's instability in the shock...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1410.1644
Arxiv.org
by Andrew R Casey
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There exists an inordinate amount of spectral data in both public and private astronomical archives which remain severely under-utilised. The lack of reliable open-source tools for analysing large volumes of spectra contributes to this situation, which is poised to worsen as large surveys successively release orders of magnitude more spectra. In this Article I introduce sick, the spectroscopic inference crank, a flexible and fast Bayesian tool for inferring astrophysical parameters from...
Topics: Astrophysics, Solar and Stellar Astrophysics, Instrumentation and Methods for Astrophysics
Source: http://arxiv.org/abs/1603.03043
Arxiv.org
by Nicholas Allgaier; Tobias Banaschewski; Gareth Barker; Arun L. W. Bokde; Josh C. Bongard; Uli Bromberg; Christian Büchel; Anna Cattrell; Patricia J. Conrod; Christopher M. Danforth; Sylvane Desrivières; Peter S. Dodds; Herta Flor; Vincent Frouin; Jürgen Gallinat; Penny Gowland; Andreas Heinz; Bernd Ittermann; Scott Mackey; Jean-Luc Martinot; Kevin Murphy; Frauke Nees; Dimitri Papadopoulos-Orfanos; Luise Poustka; Michael N. Smolka; Henrik Walter; Robert Whelan; Gunter Schumann; Hugh Garavan;...
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The field of neuroimaging has truly become data rich, and novel analytical methods capable of gleaning meaningful information from large stores of imaging data are in high demand. Those methods that might also be applicable on the level of individual subjects, and thus potentially useful clinically, are of special interest. In the present study, we introduce just such a method, called nonlinear functional mapping (NFM), and demonstrate its application in the analysis of resting state fMRI from...
Topics: Quantitative Biology, Neurons and Cognition, Neural and Evolutionary Computing, Computing Research...
Source: http://arxiv.org/abs/1510.03765
Defense Technical Information Archive
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This report describes a research program at Stanford University that focused on four areas of critical concern in the study of the combustion of jet fuels at low temperatures: the development of a fundamental kinetics database utilizing shock tubes and laser absorption for jet fuel surrogate components; the development of a new constrained-reaction-volume strategy to improve shock tube performance; the development of new laser diagnostics techniques; and the application of an aerosol shock tube...
Topics: DTIC Archive, STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING, KINETICS, LASER DIAGNOSTICS, SHOCK...
Defense Technical Information Archive
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A multigrid acceleration technique developed for solving the three dimensional Navier-Stokes equations for subsonic/transonic flows has been extended to supersonic/hypersonic flows. An explicit multistage Runge Kutta type of time-stepping scheme is used as the basic algorithm in conjunction with the multigrid scheme. Solutions have been obtained for a blunt conical frustum at Mach 6 to demonstrate the applicability of the multigrid scheme to high speed flows. Computations have also been...
Topics: DTIC Archive, Vatsa, Veer N, INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON...
Defense Technical Information Archive
by Defense Technical Information Center
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This report results from a contract tasking Institute of Theoretical and Applied Mechanics as follows: The contractor will help the CFD group at AFRL to better understand shock-wave/turbulent boundary layer phenomena by providing a comprehensive set of experimental data with emphasis on both quantitative and flow visualization aspects. He will fill-in the gaps which exist in the test matrix both at Mach 4 and 5 He will also expand the range of measurements to include shock structure and skin...
Topics: DTIC Archive, Zheltovodov, Alexander A., RUSSIAN ACADEMY OF SCIENCES NOVOSIBIRSK INST OF...
Defense Technical Information Archive
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The state of Hawaii identified the need for Barbers Point Harbor to accommodate larger ships and increase the number of available berths. Modifications to the harbor were proposed, including widening the entrance channel, and deepening (from 38 to 45 ft) and expanding the harbor basin (1,000-ft by 1,100-ft area on the northeast side of the harbor). Physical and numerical (computer) model studies were conducted from September 1990 to June 1992 at the U.S. Army Engineer Waterways Experiment...
Topics: DTIC Archive, Briggs, Michael J., COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS, *OCEAN WAVES,...
Defense Technical Information Archive
by Defense Technical Information Center
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Fourteen commercially available submersible pressure gauges were evaluated by the Navy Experimental Diving Unit to determine accuracy and watertight integrity. The gauges tested represent a realistic survey of the market. While not every gauge currently sold in the U.S.A. was tested, the results of this test are felt to represent the general state-of-the-art in gauge design and manufacturing technique. As a result of unmanned testing, and due to the overall quality of design and construction,...
Topics: DTIC Archive, Middleton,James R, NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL, *TEST AND...
Defense Technical Information Archive
by Defense Technical Information Center
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Operation Ivy was instrumented for the mass-motion method of pressure measurement in a manner similar to that used on Operations BusterJangle and Tumbler-Snapper. Low-altitude pyrotechnic mortar bursts and high-altitude gun bursts (on Mike only) labeled the air for photographic recording. The methods of instrumentation are described; the method of data analysis is outlined; and derived data on time of arrival, peak material velocity, peak shock velocity, and peak overpressure are presented in...
Topics: DTIC Archive, Seacord, Jr, Daniel F, LOS ALAMOS NATIONAL LAB NM, *BAROMETRIC PRESSURE, *NUCLEAR...
Defense Technical Information Archive
by Defense Technical Information Center
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An effort has been made to present the various topics in the theory of graphs in a logical order, to indicate the historical background, and to clarify the exposition by including figures to illustrate concepts and results. In addition, there are three appendices which provide diagrams of graphs, directed graphs, and trees. The emphasis throughout is on theorems rather than algorithms or applications, which however are occasionally mentioned.
Topics: DTIC Archive, Harary, Frank, MICHIGAN UNIV ANN ARBOR DEPT OF MATHEMATICS, *GRAPHICS, COLORS,...
Defense Technical Information Archive
by Defense Technical Information Center
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Determine the practicability of using Carr Inlet for submarine hull sonar frequency response studies. Such an appraisal requires analyses of frequency dependence of signal propagation over a prescribed path.
Topics: DTIC Archive, Abbott,F R, NAVY ELECTRONICS LAB SAN DIEGO CALIF, *ACOUSTIC ATTENUATION, *ACOUSTIC...
Defense Technical Information Archive
by Defense Technical Information Center
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This technical report comprises ten publications on the reflection of ultrasonic waves at liquid-solid interfaces. Description is given of both experimental and theoretical advances in the understanding and utilization of reflection phenomena. Attention is concentrated primarily on the angles at which leaky surface waves are excited along the interface. Rayleigh angle phenomena are described, as well as the backward shift resulting from a periodicity superimposed on the interface. Utilization...
Topics: DTIC Archive, Breazeale,M A, TENNESSEE UNIV KNOXVILLE ULTRASONICS LAB, *INTERFACES, *ACOUSTIC...
The atlas, consisting of two volumes and a separately bound appendix, summarizes available acoustic and environmental data in the Caribbean Sea, Gulf of Mexico and in their Atlantic Ocean approaches between 10 degrees N and 30 degrees N and west of approximately 56 degrees W. This volume includes data on geomagnetic background, subbottom structures, wind, waves, rainfall, and currents.
Topics: DTIC Archive, NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS, *UNDERWATER SOUND, *MEXICO GULF,...
Efforts to characterize the response of complex structural systems to the intense transient loads generated by bomb blast can involve significant computational effort. Additionally, the practitioner must have a substantial amount of experience to interpret the results of these analyses. Unfortunately, when facilities are subject to terrorist attacks, sufficient time is often not available for detailed analysis. Southwest Research Institute (SwRI), under contract to the US Army Corps of...
Topics: DTIC Archive, CORPS OF ENGINEERS OMAHA NE, *DAMAGE ASSESSMENT, *BUILDINGS, *VULNERABILITY, *BLAST...
Defense Technical Information Archive
by Defense Technical Information Center
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This young investigator award from the Air Force Office of Scientific Research to Daniel Forger played a pivotal role in his career. Many discoveries were made and are described in over 10 published papers or manuscripts in preparation. Some research highlights include: 1) discovering that timekeeping in mammals is more complex than originally thought, 2) discovering on how to optimally stimulate neuronal (and in particular the circadian) systems and 3) mathematical methods for studying...
Topics: DTIC Archive, MICHIGAN UNIV ANN ARBOR DEPT OF MATHEMATICS, *BIOLOGICAL RHYTHMS, *MAMMALS,...
Defense Technical Information Archive
by Defense Technical Information Center
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The two important qualities of a cipher is security and speed. Frequently, to satisfy the security of a Boolean function primitive, speed may be traded-off. In this paper we present a general construction that addresses both qualities. The idea of our construction is to manipulate a cryptographically strong base function and one of its affine equivalent functions, using concatenation and negation. We achieve security from the inherent qualities of the base function, which are preserved (or...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF APPLIED MATHEMATICS, *BOOLEAN ALGEBRA,...
Defense Technical Information Archive
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The first phase of this process was the comparison of statistical parameters from analyses carried out by degree of latitude, cognizant of the summer collection period of the 1996 cruise. The second phase was a closer examination of instrument differences and how these might influence current selection criteria in statistical analysis. The final phase has been the consolidation of further data from 1976 and 1991 to permit the comparison of the 1996 dataset with earlier data from similar data...
Topics: DTIC Archive, Wadhams, Peter, SCOTT POLAR RESEARCH INST CAMBRIDGE (UNITED KINGDOM), *SUBMARINES,...
NAVPERS Collection
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This book is part of a nine-volume set. The chapters in this fourth book about Transmitter Circuit Applications are: 24. Oscillators...1 25. Radio frequency power amplifiers...21 26. Amplitude modulation...5 27. Transmission lines...75 28. Antenna and wave propagation...95
Topics: NAVPERS, oscillator, power amplifier, amplitude modulation, antenna
Defense Technical Information Archive
by Defense Technical Information Center
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Two wave gages were operated at Lidington Harbor, Michigan, from May 1983 to December 1983. The objective of the study was to determine the relationship of wave action in the harbor with wave action occurring in Lake Michigan. One gage was located in Lake Michigan just outside the harbor; the other was located in the interior channel near ferry terminal number 1. Concurrent wind data were obtained at the Ludington Harbor Coast Guard Station. Interpretation of the results and conclusions are...
Topics: DTIC Archive, Horsham,G M, COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS, *WATER WAVES,...
Defense Technical Information Archive
by Defense Technical Information Center
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The corner vortex originating in the hull-sail intersection region is an important component of the submarine flow field. The vortex may play a major role in overall drag, wake development and propeller performance, and may be a major acoustic source. The flow itself is complex, being three-dimensional, viscous and turbulent. Earlier work computed the flow field around the hull and the sail. The present report focuses on the portion of the flow in the hull-sail corner downstream of the sail...
Topics: DTIC Archive, Levy, Ralph, SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT, *SUBMARINE SAILS,...
This preliminary edition is a documented historical summary of the underwater sound range prediction techniques utilized by the U. S. Navy through February 1944. It is the initial part of a complete summary analysis of all underwater sound range prediction techniques utilized by the U.S. Navy to the present. For the period covered by the report, the significant developments in underwater sound range prediction are summarized, the sources responsible for the development are identified and the...
Topics: DTIC Archive, Stuart,J D, TRACOR INC AUSTIN TEX, *PREDICTIONS, *RANGE FINDING, *SONAR,...
Hydrogen sulfide produced by sulfate-reducing bacteria is a well recognized toxic hazard in storage tanks on HMA Ships, however, it also has the potential to be an explosive hazard. Hydrogen sulfide can cause explosions when its concentration exceeds 4% in air. A number of storage tanks on HMA Ships theoretically have the potential to produce enough hydrogen sulfide to exceed this figure. This report assesses the likelihood of this occurring in ballast and sewage holding tanks. Sewage tanks...
Topics: DTIC Archive, Fletcher, Lyn E., DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA),...
Books to Borrow
by Royal, William R; Burgess, Robert Forrest, joint author
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Includes index
Topics: Royal, William R, Underwater archaeology, Spear fishing, Shark attacks
Dissertation advisor(s): Shreeve, R.P
Topic: Aeronautics,Cascades (Fluid dynamics),Laser Doppler velocimeter,Fluid dynamics,Stalling...
Arxiv.org
by Wojciech Tomczyk; Grzegorz Pająk; Lech Longa
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How change in molecular structure can affect relative stability and structural properties of the twist-bend nematic phase (N$_\text{TB}$)? Here we extend the mean-field model [C. Greco et al., Soft Matter, 2014, 10, 9318] for bent-shaped achiral molecules, to study the influence of arm molecular biaxiality and the value of molecule's bend angle on relative stability of N$_\text{TB}$. In particular we show that by controlling biaxiality of molecule's arms up to four ordered phases can become...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1606.00633
Arxiv.org
by Siu-Wing Cheng; Man-Kit Lau
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Surface reconstruction from an unorganized point cloud is an important problem due to its widespread applications. White noise, possibly clustered outliers, and noisy perturbation may be generated when a point cloud is sampled from a surface. Most existing methods handle limited amount of noise. We develop a method to denoise a point cloud so that the users can run their surface reconstruction codes or perform other analyses afterwards. Our experiments demonstrate that our method is...
Topics: Computing Research Repository, Graphics
Source: http://arxiv.org/abs/1704.04038
Close-in air blast from the Sedan event was considerably greater than expected on the basis of previous measurements of blast from nuclear events in basalt and from HE events in both basalt and alluvium. In Spite of overranging of the pressure gages, the measurements permit derivation of a lower limit of peak overpressure and an upper limit on the amount of blast Suppression resulting from charge burial. Comparison of Sedan blast suppression with that of previous buried HE and nuclear shots...
Topics: DTIC Archive, Vortman, L J, SANDIA CORP ALBUQUERQUE NM, *NUCLEAR EXPLOSIONS, *MEASUREMENT, *BLAST,...
Defense Technical Information Archive
by Defense Technical Information Center
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Ordered Binary Decision Diagrams OBDDs represent Boolean functions as directed acyclic graphs. They form a canonical representation, making testing of functional properties such as satisfiability and equivalence straightforward. In most application, their size remains manageable. A number of operations on Boolean functions can be implemented as graph algorithms on OBDD data structures. Using OBDDs a wide variety of problems can be solved through symbolic analysis. First, the possible variations...
Topics: DTIC Archive, Bryant, Randal E, CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE,...