| Comparison of F-15E and F-16 Dynamic Targeting Persistence in a Fuel-Limited Environment |
14 DEC 2007 |
107 pages |
| Authors:
Brian M. Farrar; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS
|
 | The United States Air Force (USAF) has developed the ability to strike newly detected targets within minutes by pre-positioning aircraft near potential targets. This "dynamic targeting" process provides responsiveness and flexibility, but it also has limitations. In order to strike a newly emerged target, an appropriately armed aircraft must be available to provide the desired effects. Such availability requires loitering, and limited fuel access could severely restrict loiter time near ... |
|
| Automation and Preclinical Evaluation of a Dedicated Emission Mammotomography System for Fully 3-D Molecular Breast Imaging |
OCT 2007 |
24 pages |
| Authors:
Spencer J. Cutler; DUKE UNIV DURHAM NC
|
| The overall objective of this proposal is to fully automate and optimize the performance of a 3-D dedicated emission mammotomography system for enhanced semi-automated clinical testing. A retrospective study of 103 clinical MRI uncompressed breast scans was conducted to create surface renderings of the uncompressed breasts and analyze how to adapt existing acquisition orbits for varying breast shapes. Laser ribbon ranging sensors and associated hardware to fully automate the radius ... |
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| Cost and Performance Report for Natural Pressure-Driven Passive Bioventing |
OCT 2004 |
43 pages |
| Authors:
Sherrie Larson; Ron Hoeppel; NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
|
| This document provides information needed for comparing passive bioventing to conventional bioventing on the basis of performance, installation and operating costs, and implementation issues. The primary demonstration objective was to identify a site where passive bioventing would be successful. The secondary objective was to measure the rate of airflow and radius of oxygen influence as the result of operating a pilot-scale passive bioventing system that consisted of one vent well ... |
|
| A Study of a Skirtless Hovercraft Design |
MAY 2004 |
70 pages |
| Authors:
Edward A. Kelleher; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Initial study into three possible skirtless hovercraft designs. The designs utilize Coanda nozzles and a Coanda wing surface to generate lift and create a pressure cushion below the craft. The pressure cushion is to be maintained by an air curtain created by flow spill from the Coanda wing surface. Three proposed skirtless hovercraft designs were analyzed via computational fluid dynamics to ascertain their lift generation capabilities. The three designs were ... |
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| The Peculiarities of Spatial Orientation of Person in Conditions of G-Influences |
FEB 2003 |
|
| Authors:
Boukhtiarov I. Valentinovich; Vorobjov O. Alexandria; Khomenko M. Nikolayevich; AEROSPACE MEDICINE AND MILITARY ERGONOMICS CENTER MOSCOW (RUSSIA) TECHNOLOGYAND PHYSIOLOGY DEPT
|
 | Six test subjects were subjected to lateral (+Gy) and longitudinal-lateral (+Gz/+Gy) accelerations in a centrifuge with a rotation radius of 6.55 m. During rotation, test subjects were instructed to indicate the position of subjective visual vertical. Results of this study demonstrated that during exposure to +Gy and +Gz/+Gy accelerations, the direction of the indicated subjective vertical approached the direction of the resultant acceleration vector when the lateral component increased. This ... |
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| Effects of Counterface Roughness and Conformity on the Tribological Performance of Crosslinked and Non-crosslinked Medical-Grade Ultra-High Molecular Weight Polyethylene |
APR 2002 |
|
| Authors:
A. D. Chawan; A. M. Chakravartula; J. Zhou; L. A. Pruitt; M. Reis; CALIFORNIA UNIV BERKELEY DEPT OF MECHANICAL ENGINEERING
|
| The tribological behavior of crosslinked ultra-high molecular weight polyethylene (UHMWPE) was compared to that of non-crosslinked UHMWPE used as control sample. A reciprocating pin-on-disk tribometer was used to determine the effects of countersurface roughness and conformity on wear mechanisms occurring during the initial stage of sliding. Pin samples of two different radii of curvature were slid against medical-grade Co-Cr alloy disks with surface roughness ranging from 0.005 to 0.04 micrometers ... |
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| An Improved Streamline Curvature Approach for Off-Design Analysis of Transonic Compression Systems |
09 APR 2001 |
189 pages |
| Authors:
Keith M. Boyer; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| A streamline curvature (SLC) throughflow numerical model was assessed and modified to better approximate the flow fields of highly transonic fans typical of military fighter applications. Specifically, improvements in total pressure loss modeling were implemented to ensure accurate and reliable off- design performance prediction. The assessment was made relative to the modeling of key transonic flow field phenomena, and provided the basis for improvements, central to which was the incorporation ... |
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| Calculating Tropical Cyclone Critical Wind Radii and Storm Size Using NSCAT Winds |
MAR 1998 |
69 pages |
| Authors:
Scott G. Magnan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Subjective and objective analyses of satellite scatterometer near- surface winds are utilized to estimate tropical cyclone (TC) critical wind radii and size over a region of the western North Pacific. An outer wind profile assuming a linear slope dependent on the TC latitude is used to determine the radial extent of cyclonic winds beyond a set radius. Inside the set radius, a partial conservation of angular momentum is assumed into ... |
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| The Outer Radius Tangential Winds of Tropical Cyclones |
10 JUL 97 |
116 pages |
| Authors:
Stephen B. Cocks; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Knowledge of the strength and horizontal extent of damaging winds from the center of a tropical cyclone is crucial for coastline preparations, forecasting coastal flooding and shipping interests. This study attempts to improve our understanding, estimation and prediction of the outer wind profiles of typhoons. The mean radii of 30 knot (R30), 50 knot (R50) and 65 knot (R65) winds are calculated using aircraft reconnaissance, satellite and synoptic data for ... |
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| Development of Pore Structure Models for Water and Contaminant Transport |
13 OCT 94 |
13 pages |
| Authors:
Girard A. Simons; SIMONS RESEARCH ASSOCIATES LYNNFIELD MA
|
| The "pore tree" model of pore structure (Simons and Finson, 1979; Simons, 1982) was developed for catalysts and sorbents to allow diffusion within a porous media in the absence of convection through the media. Under current ARO sponsorship, the pore tree model is being extended to describe the permeable pore structure which characterizes the subsurface flow of water in soil, the dispersion of contaminants and the in-situ remediation of contaminated ... |
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| CO2 Lidar Technique for Observing Characteristicrop Drop Size in Water Clouds |
JAN 93 |
|
| Authors:
Wynn L. Eberhard; NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION BOULDER CO WAVE PROPAGATION LAB
|
| An analytical evaluation demonstrates that a calibrated 10.6-um- wavelength lidar can measure the mean radius and the effective radius of the drop size distribution in a water cloud. The radius parameter observed is a weighted average over the penetration depth of the pulse, with weighting factor decreasing with optical depth. In this method, the lidar signal is integrated and boundary conditions on optical depth are applied to obtain the average ... |
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| Wide Bandwidth Barrel Stave Projector. |
28 OCT 1991 |
|
| Authors:
Robert J. Obara; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An underwater acoustical projector has its barrel staves located radially outward of a piezoelectric ceramic driver. The barrel staves are in an hour glass arrangement. The cross-sectional arrangement of the barrel staves is circular at both the top and bottom of the hour glass forming elliptical cross-sections of varying eccentricity between said top and bottom of said staves. The cross-section of greatest eccentricity is located midway between the top and ... |
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| Demonstration of the Measurement of Light Scattering at an Angle of Zero Degrees from a Single Particle |
23 OCT 91 |
22 pages |
| Authors:
Edward S. Fry; TEXAS A AND M UNIV COLLEGE STATION DEPT OF PHYSICS
|
| Measurements of light scattering by a glass fiber at an angle of 0 deg were successfully made at a wavelength of 0.5145 micrometers. Data were obtained as a function of fiber radii from 1 micrometer to 35 micrometers and are in excellent agreement with theory. This new measurement technique is based on the fanning of coherent light beam in a photorefractive BaTiO3 crystal. The use of fanning is a variant ... |
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| The Instability of Instability |
MAY 91 |
57 pages |
| Authors:
Craig A. Tovey; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH
|
| Democratic simple majority voting is perhaps the most widely used method of group decision making in our time. Current theory, based on instability theorems, predicts that a group employing this method will almost always fail to reach a stable conclusion. There is one case that the classical instability theorems do not treat: an even number of voters in 2 dimensions. We resolve this remaining case, proving that instability occurs with ... |
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| Computational Fluid Dynamics Method for Low Reynolds Number Flow in a Precessing/Spinning, Liquid Filled Cylinder with Rounded Endcaps |
DEC 89 |
36 pages |
| Authors:
Michael J. Nusca; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The flight stability of liquid-filled, spin-stabilized projectiles has been considered for a wide variety of conditions. The three-dimensional, steady, laminar, Navier-Stokes equations are solved using an implicit finite- difference scheme based on successive-over-relaxation. These numerical simulations are used to predict the behavior of incompressible liquids undergoing steady spin and steady precession at a fixed precession angle. The liquid is contained in a fully-filled cylinder with flat or rounded endcaps. These ... |
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| Geostrophic Pumping, Inflows and Upwelling in Barrier Reefs |
JUL 89 |
|
| Authors:
Doron Nof; Jason H. Middleton; NEW SOUTH WALES UNIV KENSINGTON (AUSTRALIA)
|
| Flow between shallow and deep oceans via gaps in separating barrier reefs is examined using a simplified two-layer analytical model. Flow resulting from a sea-level difference between ocean and lagoon imposes a pressure gradient along the gap which forces a flow into the lagoon. The coral reefs, which extend all the way to the surface, are represented by two portions of an infinitely long wall. A group of passages, whose ... |
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| Analytical and Experimental Investigation of Miniature Heat Pipes. Phase 2 |
24 JUN 89 |
|
| Authors:
G. P. Peterson; B. R. Babin; TEXAS A AND M UNIV COLLEGE STATION DEPT OF MECHANICAL ENGINEERING
|
| A combined experimental and analytical investigation was conducted in order to identify and better understand the phenomena which govern the performance limitations and operating characteristics of micro heat pipes - heat pipes so small that the mean curvature of the vapor-liquid interface is comparable in magnitude to the reciprocal of the hydraulic radius of the flow channel. The analytical portion of the investigation began by developing a steady-state model in ... |
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| Measurements of Bubble Properties Using a Multi-Frequency Sound Field |
JUN 89 |
|
| Authors:
Robert A. Perron; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| An apparatus was designed, constructed, and tested to measure properties of single bubbles in a fluid by use of a multi-frequency sound field. The theoretical background on the dual frequency method for obtaining bubble properties such as resonance frequency, rectified diffusion thresholds and rates, rise-time sizing, and damping coefficients are discussed. Specifications and design of the device are presented. Sizes of single air bubbles in water determined from dual frequency ... |
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| Problems Encountered in the Stokes' Numerical Integration of Terrestrial Gravity Anomalies |
18 JAN 89 |
|
| Authors:
Gary R. Weigel; DEFENSE MAPPING AGENCY WASHINGTON DC
|
| Various sets of gravimetric geoid undulations were completed at 600 globally distributed Doppler station sites using geopotential coefficients and different cap sizes of terrestrial gravity data. The means and standard deviations of the residuals between these gravimetric undulations and corresponding Doppler-derived geometric undulations were then computed for each set and compared. The gravimetric undulations were determined using either the OSU 81 or WGS 84 set of geopotential coefficients, each complete ... |
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| Numerical Simulation for the Permeation of Barrier Materials by Neat Liquid Droplets |
OCT 88 |
|
| Authors:
Anastasios P. Angelopoulos; Nathan S. Schneider; Jerry H. Meldon; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| A computer simulation for the permeation of neat, non-spreading liquid droplets through barrier materials has been developed. Included in this report is the mathematical formulation of the problem, the numerical method of solution (with copy of computer program appended), and the theoretical results on the effects of barrier thickness, agent solubility, evaporation from the droplet and the upstream surface of the barrier, the invariant contact angle, and the symmetry radius ... |
|
| The JUGFAE (Jug-Contained Fuel-Air Explosive) Concept |
APR 88 |
51 pages |
| Authors:
John D. Sullivan; Charles N. Kingery; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Uncontested minefields, ones without covering enemy fire, are cleared cautiously but still cause casualties. The Jug-Contained Fuel-Air-Explosive (JUGFAE) concept does not send men into the minefield, but lets them proceed methodically from the minefield boundary. Safety and thoroughness are inherent in the setup process. The concept prescribes crane emplaced rows of plastic jugs containing detonable fuel. When fueled jugs are in place, a single large fuel- air explosion is triggered. ... |
|
| Experimental Determination of the Coefficients of the Hydraulic Resistance of Apertures in the Rotary Disks |
22 JAN 88 |
|
| Authors:
I. T. Shvets; Ye. P. Dyban; G. F. Selyavin; M. V. Stradomskiy; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
|
| Conclusion/derivations. 1. Rotation of disk exerts a substantial influence on condition of course of air through apertures. In the large ratios of the velocity of the rotation of the mean flow rate in the opening/aperture (order u/c=2.5) the value of the coefficient of flow rate for the openings/ apertures with the sharp entering edges decreases approximately 6 times. 2. With sufficient high u/c (more than 4) effect of form of ... |
|
| On Hotelling's Formula for the Volume of Tubes and Naiman's Inequality |
DEC 87 |
|
| Authors:
Iain Johnstone; David Siegmund; STANFORD UNIV CA DEPT OF STATISTICS
|
| Motivation by the question of testing for a nonlinear parameter in a regression model with independent, homoscedastic normal residuals, Hotelling (1939) was led to consider the geometric problem of computing the volume of a tube of given radius around a curve in s to the n-1 power the unit sphere in ir to the nth power. The answer involves only the arc length of the curve and not its curvature, ... |
|
| Renormalization of an Inverse Scattering Theory for Gaussian Dielectric Profiles |
10 JUN 86 |
|
| Authors:
A. K. Jordan; H. D. Ladouceur; NAVAL RESEARCH LAB WASHINGTON DC
|
| An inversion method is developed for reconstructing the average permittivity profiles of inhomogeneous dielectric slabs from reflection coefficient data. Renormalized solutions are obtained for an inverse scattering problem that are equivalent to the second order regular perturbation approximations. Solutions with increased radii of convergence are obtained. Numerical examples are demonstrated for simulated scattering data from average dielectric profiles that are Gaussian functions. Keywords: Inverse scattering; Renormalization; Dielectric layers; Gaussian distributions. ... |
|
| Creeping Ray Analysis of Resonance for Prolate Spheroid |
JUN 86 |
|
| Authors:
A. Q. Howard Jr.; R. M. Jones; J. I. Simon; ARIZONA UNIV TUCSON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A ray orbit resonance condition is postulated and shown to reproduce asymptotically the resonant frequencies of a prolate spheroid. The method uses local creeping rays associated with a smooth convex impedance surface. As expected, the method deteriorates for high aspect ratio spheroids where the tip radii of curvatures are electrically small. This work is an alternative approach to Howard's earlier geometric treatment and gives the relation to creeping ray analysis. ... |
|
| Rapid Electron Beam Accelerator (REBA-TRON). |
05 MAR 1986 |
|
| Authors:
Christos A. Kapetanakos; Phillip A. Sprangle; Demonsthenes Dialetis; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The invention comprises a particle accelerator with a toroidal vacuum chamber, an injector for injecting a charged paticle beam into the chamber and an exit port to extract the accelerated particle beam. A toroidal magnetic field to confine the beam in the chamber is generated by a set of coils with their axis along the minor axis of the chamber and by two twisted wires that carry current in the ... |
|
| Measurements of Acoustic Backscatter of the Deep Sea Floor Using a Deeply Towed Vehicle |
DEC 85 |
|
| Authors:
Marco Weydert; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
|
| In 1983 in area of Copper-Nickel rich manganese nodules at 14 deg 40 min N, 126 deg 25 min W (site 'E ) was intensively studied with the Deep-Tow of the Scripps Institution of Oceanography, and 16 box cores were collected. Deep- Tow studies of the Thirtymile-Bank off the California Coast and the deep sea at the foot of the Patton Escarpment followed. The nodule coverage at site 'E varies ... |
|
| Active Detection of Tunnels by Induced Seismic Spectra |
SEP 84 |
|
| Authors:
R. F. Ballard Jr.; T. B. Kean Ii; R. D. Lewis; G. E. Smith Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| A series of crosshole tests were conducted at the Colorado School of Mines Test Facility located near Idaho Springs, Colo. The primary objective of the study was to determine the modifications imposed on a seismic signal originating from a repeatable source caused by presence of a tunnel. The seismic source was a modified air gun, designed for generation of midfrequency range P- waves. In this study, 50- to 500 Hz ... |
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| Resonator Insensitive to Paraxial Accelerations. |
19 APR 1984 |
|
| Authors:
M. Nakazawa; A. Ballato; DEPARTMENT OF THE ARMY WASHINGTON DC
|
| This document describes a ring-supported quartz crystal resonator having a circular peripheral which is configured in the form of a domed arch wherein the top and bottom surfaces thereof are, respectively, convex and concave. In one embodiment the radius of curvature of the convex and concave top and bottom surfaces are substantially equal so that an arch of substantially uniform thickness is provided. In a second embodiment, the convex and ... |
|
| Spectral Power Density Extrema for Microwave Emission from a Relativistic Reflex Triode |
FEB 1984 |
|
| Authors:
M. J. Smith; HARRY DIAMOND LABS ADELPHI MD
|
| Spectral power density extrema are investigated for variable frequency and fixed beam radius, for variable beam radius and fixed frequency, and for both variable frequency and beam radius in the one-dimensional sheet model of the relativistic reflex triode. Approximate and exact formulations are given. A simple example is presented wherein the power spectrum exhibits gross features of the real situation. The extrema are seen to be closely related to the ... |
|
| Channel Widths in Bends and Straight Reaches between Bends for Push Towing. Hydraulic Model Investigation |
OCT 1982 |
|
| Authors:
Louis J. Shows; John J. Franco; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
|
| This investigation was concerned with the development of parameters that could be used as a guide in the layout and design of shallow-draft waterways, particularly bends and straight reaches between bends. Results are based largely on model studies using different linear scales and some limited prototype tests. In negotiating a bend or making a turn, tows occupy a greater channel width than in straight reaches. The width of channel required ... |
|
| Multiplicativity Factors for C-Numerical Radii |
SEP 1982 |
|
| Authors:
Moshe Goldberg; E. G. Straus; CALIFORNIA UNIV SANTA BARBARA INST FOR THE INTERDISCIPLINARY APPLICATIONS OF ALGEBRA AND COMBINATORICS
|
| For two n-square matrices A,C, the C-numerical radius of A is the nonnegative quantity r sub c(A) = max(/tr(CU*AU)/ : U unitary). This generalizes the classical numerical radius r(A). It is known that r sub C constitutes a norm on the algebra of n-square matrices if and only if C is nonscalar and tr C does not = 0. For all such C we obtain multiplicativity factors for r sub ... |
|
| Service Simulation Tests to Determine the Fatigue Life of OD Notched Thick-Wall Cylinders |
APR 1982 |
|
| Authors:
J. A. Kapp; J. H. Underwood; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
|
| Simulation specimens were used to model the fatigue behavior of an OD notched internally pressurized cylinders of alloy steel. Results from continuum mechanics and finite element analyses are described for use in selection of simulation test conditions. The effects of notch depth and residual stress on fatigue life are determined from the simulation tests. (Author) |
|
| The DNA Nuclear Blast Standard (1 KT) |
30 JAN 1981 |
167 pages |
| Authors:
Charles E. Needham; Joseph E. Crepeau; SYSTEMS SCIENCE AND SOFTWARE INC ALBUQUERQUE NM
|
| A set of subroutines has been developed which provide complete definition of the blast environment resulting from the free air detonation of a one kiloton device in a sea-level atmosphere. The subroutines provide the pressure, density, and velocity as function of space and time (from 1 ms to several minutes). The analytic fits are compared with results of hydrodynamic calculations and with experimental data. Blast parameters are as a function ... |
|
| Two-Dimensional Thermal Oxidation of Silicon. 1. Experiments |
79 |
|
| Authors:
D. B. Kao; J. P. McVittie; W. D. Nix; K. C. Saraswat; STANFORD UNIV CA INTEGRATED CIRCUITS LAB
|
| This paper introduces a unique experimental approach in which extensive data were obtained concerning the oxidation of cylindrical silicon structures of controlled radii of curvature. It is quantitatively demonstrated that the oxidation of curved silicon surfaces is retarded at low temperatures and sharp curvatures, and that the retardation is more severe on concave than convex structures. These observations will be interpreted using a physical model based on stress effects on ... |
|
| Point Source Explosion in a Solid |
NOV 1959 |
113 pages |
| Authors:
T. A. Zaker; ARMOUR RESEARCH FOUNDATION CHICAGO IL
|
| This report presents an approximate theory of the growth of a point source explosion in an infinite solid or liquid medium in the range of shock pressure below that required to induce a physical change of phase of the material, and above pressures at which the wave propagation can be considered acoustic. The analysis is based on the characterization of the shock state locus for the material by a general ... |
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| CONVESITY OF FUNCTIONALS BY TRANSPLANTATION |
19 OCT 1953 |
|
| Authors:
G. POLYA; M. SCHIFFER; STANFORD UNIV CALIF APPLIED MATHEMATICS AND STATISTICS LABS
|
| The dependence of various functionals on their domain of definition is discussed. The functionals are defined by certain extremum problems. The methods of transplanting extremum functions and of variation are applied to the problem of utilizing the knowledge of the functional for a few special domains to obtain knowledge about the same functional in the general case. Functionals such as torsional rigidity, virtual mass, outer conformal radius, and electrostatic capacity ... |
|
| CRATERING EFFECTS IN SAND AND LOESS SOIL, SURFACE WAVES AND AIR-BLAST MEASUREMENTS FOR SCALED WATER DEPTHS OF 60 AND 100 FT |
JUL 1953 |
|
| Authors:
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
|
| Plots of apparent crater depth vs charge weight showed that under water charge position has a moderate effect on crater depth for a sand bottom, particularly for the 100-ft scaled water depth. Charges below the bottom produced crater widths averaging 1.15 the width of comparable craters of charges positioned at the bottom for both 60- and 100-ft depths. Significant crater lips were formed in eac scaled water depth for charges ... |
|
| A STUDY OF THE SCATTERING OF SOUND WAVES IN FLUIDS. PART I. SCATTERING OF A PLANE WAVE BY A SPHERICAL BUBBLE |
10 JUN 1953 |
|
| Authors:
F.C. KARAL; MAGNOLIA PETROLEUM CO DALLAS TEX
|
| An analysis was made of the scattering of a plane wave by a spherical bubble immersed in a homogeneous, perfect fluid of infinite extent. An expression was obtained for sthe average sound intensity of the scattered wave in close proximity to the bubble. The case of long wave lengths or small bubble radii was given special consideration. Numerical results are presented in polar-diagram form for several values of R/a and ... |
|
| A MATHEMATICAL MODEL OF ZONALLY UNIFORM ATMOSPHERIC CIRCULATION |
JUN 1953 |
|
| Authors:
N.P. FOFONOFF; BROWN UNIV PROVIDENCE R I
|
| A model of a simplified atmosphere is described which permits the analytical study of heat-exchange processes. The equations of mass and momentum conservation were the basis for the model. The atmosphere was assumed to be an almost incompressible fluid covering a smooth earth to a very small mean depth in comparison with the earth's mean radius. The steady-state motion of the atmosphere was assumed to be driven by a known ... |
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| UNDERWATER EXPLOSION BUBBLES. II. THE EFFECT OF GRAVITY AND THE CHANGE OF SHAPE |
JUN 1953 |
|
| Authors:
Ignace I. Kolodner; Joseph B. Keller; KANSAS STATE UNIV MANHATTAN
|
| A systematic method is presented for determining the shape and rise of an underwater explosion bubble. The water is assumed to be incompressible and unbounded, and the pressure is assumed to be uniform throughout the bubble at all times. The bubble is assumed to be initially spherical. The velocity of the fluid is assumed to be derivable from a potential function satisfying Laplace's equation so that the pressure in the ... |
|
| A TENTATIVE THEORY OF METALLIC WHISKER GROWTH |
JUN 1953 |
|
| Authors:
J.D. ESHELBY; ILLINOIS UNIV CHICAGO COLL OF DENTISTRY
|
| The surface-tension forces on a small hump of a metallic surface are considered in a theory of metallic whisker growth. Approximate calculations relate the whisker radius to a Frank-Read source at the surface of the metal. The rate of growth of a tin whisker at room temperature is calculated to be from 1 mm to 1 cm per year for K Beta n - 100 to 1000. K is a ... |
|
| MODE CONTROL AND OPERATING VOLTAGES OF INTERDIGITAL MAGNETRONS |
05 MAY 1953 |
|
| Authors:
AMARJIT SINGH; HARVARD UNIV CAMBRIDGE MA CRUFT LAB
|
| Studies were made controlling the frequencies of all the modes up to the second order, and investigations were made to study the electronic operation of first- and second-order modes. Experiments with operating tubes show that under given conditons, the first- and second- order modes can operate at more than 1 voltage. The different voltages can be attributed to the excitation of different Fourier components of the field configuration. Variation of ... |
|
| OPERATIONAL SUITABILITY TEST OF THE F-86F AIRPLANE |
04 MAY 1953 |
|
| Authors:
ARMY BIOLOGICAL LABS FREDERICK MD
|
| The North American F-86F is a single-place jet fighter powered by a J47-GE-27 axial-flow turbojet engine rated at 6090 lb of thrust. The aircraft has swept-back wings and empennage, hydraulic irreversible controls, an artificial control stick feel system. fuselage speed brakes, and an AN/ARC-27 (UHF) radio set. Four under-wing pylons provide fighter-bomber capabilities which are available for various combinations of fuel tanks, bombs, and napalm. The radius of action is ... |
|
| THE EFFECT OF THE SURFACE ON THE MAGNETIC PROPERTIES OF AN ELECTRON GAS |
10 MAR 1953 |
|
| Authors:
HARVEY BROOKS; F.S. HAM; HARVARD UNIV CAMBRIDGE MA CRUFT LAB
|
| A determination of the magnetic susceptibility of a system of e lectrons confined in a box is presented which considers the dependence of susceptibility on the form of the wall potential. An improved argument is given for a cylindrical box in which the balancing of diamagnetic and paramagnetic states is clarified, and which determines (by means of the WKB approximation) the nature of the boundary states. A more detailed derivation ... |
|
| PULSATIONS AND GROWTH OF GAS-FILLED BUBBLES IN SOUND FIELDS |
08 AUG 1952 |
46 pages |
| Authors:
Murray D. Rosenberg; HARVARD UNIV CAMBRIDGE MA ACOUSTICS RESEARCH LAB
|
| The pulsations of a gas-filled bubble in a sound field are discussed with particular attention to the effect of the viscosity of the external liquid, the irreversible conduction of heat by the gas within the bubble, and the scattering of energy by the bubble. The expressions for the gas pressure within the bubble and the time rate of change of bubble radius are used to determine the rate at which ... |
|
| Separation of a Gas Mixture Flowing Through a Long Tube at Low Pressure |
14 DEC 48 |
13 pages |
| Authors:
R. D. Present; A. J. deBethune; TECHNICAL INFORMATION SERVICE (AEC) OAK RIDGE TN
|
| The separation of a binary gas mixture by diffusion through a capillary of radius r depends on the fact that the molecules have different masses m sub i and mean speeds v sub i. When the inlet pressure is so low that the mean free path lambda is much greater than r, the flow is diffusive and the separation factor (at zero outlet pressure) has its maximum value (m sub ... |
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