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Aug 22, 2021
08/21
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Joe W (Joew1120)
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With one side you can draw intersecting lines to determine the center point of a cylinder; while the other side can be used for rough measurement of a cylinder's radius and fairly accurately measures radius' up to 64mm. A radius can be measured without needing to draw & measure a center line. This results in faster & easier measurements while still providing an accuracy within 1mm. First off, my thanks to the original Thingiverse designer Jean-Marie Astruc, for the nice clean design....
Topics: Radius, Measure, Bevel, Radius Measure, Hand Tools, Center, stl, thingiverse, Finder, Center Finder
Our principal objective is to develop an objective and automatic intensity estimator of Tropical Cyclones (TCs) based on satellite infrared (IR) imagery. The proposed methodology analyzes the TC s structure to estimate their intensity, which will be available every 30 minutes (or depending on image acquisition availability) for the Atlantic, Eastern North Pacific and Western North Pacific basins. We are investigating the underlying atmospheric dynamics by using mesoscale modeling and comparing...
Topics: DTIC Archive, ARIZONA UNIV TUCSON, *TROPICAL CYCLONES, AUGMENTATION, FORECASTING, INFRARED...
This report describes progress during the 8th quarter of this program and summarizes the current status of the research. Technical activities this period included investigation and application of a simple but clarifying wave-mapping methodology that provides guidance in making more-effective use of curved platform surfaces. This results in conformal designs that provide both higher gain and greater peak power handling. In particular, this design perspective steered us to a notable success...
Topics: DTIC Archive, SCIENTIFIC APPLICATIONS AND RESEARCH ASSOCIATES INC CYPRESS CA, *ANTENNAS, PEAK...
In earlier works we used spheres of various sizes as impedance probes in demonstrating a method of determining plasma potential, p, when the probe radius is much larger than the Debye length, D. The basis of the method in those works 1-4 relies on applying a small amplitude signal of fixed frequency to a probe in a plasma and measuring the complex reflection coefficient, , for varying probe bias, Vb. For a given frequency, Re(Zac) (the real part of the complex plasma impedance determined from )...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC, *PLASMAS(PHYSICS), ALGORITHMS, IMPEDANCE, PLASMA...
This paper reports on continued research toward establishing a consistent modeling framework for calculating nuclear explosions in earth materials. The model must be consistent with observed phenomena in the near-field by correctly 1) calculating the resulting explosive cavity radius for a given yield and depth of burial, 2) accounting for the correct energy deposition by partitioning it into internal (heat and plastic strain) and kinetic (e.g. radiated seismic) energy, 3) predicting the...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *SEISMOLOGY, COMPUTATIONS, EXPLOSIVES, HYDRODYNAMICS,...
A new analysis of lunar occultation observations from 1955 to 1974 utilizing Atomic Time gives a value for the empirical part of the secular acceleration of the Moon's mean longitude of (- 65 plus or minus 18)/cy(2). This differs from other determinations which utilized the Ephemeris Time scale, based on the apparent annual motion of the Sun about the Earth. These latter, which give ( - 38 plus or minus 4)/cy(2), measure only the tidal component of the Moon's longitude acceleration. The...
Topics: DTIC Archive, NAVAL OBSERVATORY WASHINGTON DC, *ACCELERATION, *OCCULTATION, DETERMINATION,...
A new polymorph of the title compound, C(36)H(30)OSi(2).2C(7)H(8), is reported which is triclinic (P1(-)) insteady of possessing the previously reported rhombohedral symmetry [Hoenle et al. (1990). Acta Cryst. C46, 1982-1984]. Each of the -SiPh(3) units are related by the inversion center. The Si-O-Si moiety is linear with the O atom sitting on an inversion center, and the O-Si-(toluene ring centroid) angle is 3.69 (15) deg. Each toluene molecule is 5.622 (2) Angstrom A from the Si atom and has...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV, *OXIDES, *TOLUENES, ATOMS, INVERSION,...
This document defines a geometric figure which is called an anti-cylinder, like the cylinder, it has a bottom circle gamma function and a topcircle gamma function' and all common normals of gamma function and gamma function' have the same length c. Figure 2 exhibits a model made by the author of 1 1/2 feet height. Unlike the two circles of a cylinder the circles gamma function and gamma function' are linked, like two consecutive elements in a chain. If made of anodized aluminum tubing and of...
Topics: DTIC Archive, Schoenberg,I J, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *CIRCLES,...
The objective of this research was to investigate the potential of rotor morphing to improve the performance of baseline helicopter configurations. The morphing parameters that have been considered in this report are variable rotor speed and variable rotor radius. Both of these parameters are considered in steady state only, so that transients that would be introduced during blade morphing are not considered. Additional morphing concepts including variable twist, chord, camber and tip shape...
Topics: DTIC Archive, MARYLAND UNIV COLLEGE PARK ALFRED GESSOW ROTORCRAFT CENTER, *HELICOPTER ROTORS,...
Topics: DTIC Archive, Lambert, David E, AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE,...
Prior research gives good estimates of the autofrettage plastic radius for a range of gun tube conditions and material strengths. A linear fit of a portion of these results gives an expression here for the plastic radius of a partially autofrettaged tube, with accurate results for tube outer radius to tube inner radius, b/a near 2.0 and degree of autofrettage near 50%, configurations of common use with autofrettaged gun tubes. These results are presented here and compared with finite element...
Topics: DTIC Archive, ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS,...
Reed-Muller codes are known to be some of the oldest, simplest and most elegant error correcting codes. Reed-Muller codes were invented in 1954 by D. E. Muller and I. S. Reed, and were an important extension of the Hamming and Golay codes because they gave more flexibility in the size of the codeword and the number of errors that could be correct. The covering radius of these codes, as well as the fast construction of covering codes, is the main subject of this thesis. The covering radius...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *CODING, ALGORITHMS, THESES, REED VALVES,...
In the theory of large random matrices, how to dominate the norm of a random matrix is a very important problem. This paper considers a different type of random matrices, namely -W to the k power, i.e. a power of a square random matrix with iid entries. The first result in this paper is the limit as n approaches infinity of the absolute value of (W/sq rt. n) to the k power is or = (1+k)(sigma to the k power) where n is the size of W and here sigma-sq. is the variance of the entries of W. We...
Topics: DTIC Archive, Bai,Z D, PITTSBURGH UNIV PA CENTER FOR MULTIVARIATE ANALYSIS, *MATRICES(MATHEMATICS),...
Early time-series photometry from NASA's Kepler spacecraft has revealed a planet transiting the star we term Kepler-4, at R.A. = 19h02m27.s68, declination = +50 deg 08 min 08 sec.7. The planet has an orbital period of 3.213 days and shows transits with a relative depth of 0.87 x 10(exp -3) and a duration of about 3.95 hr. Radial velocity (RV) measurements from the Keck High Resolution Echelle Spectrometer show a reflex Doppler signal of 9.3(+1.1 sub 1.9) m s-1, consistent with a...
Topics: DTIC Archive, NAVAL OBSERVATORY FLAGSTAFF AZ, *PLANETS, DENSITY, DEPTH, DOPPLER EFFECT, MASS,...
Let T and T' be two tori which are linked like the two consecutive elements of a chain. Moreover the author assumes that T and T' have central circles of equal radii. By central circle of a torus he means the locus of the center of the sphere of constant radius which envelopes the torus. It is shown that the linked tori can be so placed that they are tangent to each other along simple closed curve gamma which is not a circle. In this mutually tangent position there is no gap between the two...
Topics: DTIC Archive, Schoenberg,I J, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *Circles,...
We have already demonstrated the utility of inductive voltage adder accelerators for production of small-size electron beams. In our approach, the inductive voltage adder drives a magnetically immersed foilless diode to produce high-energy (10-20 MeV), high-brightness pencil electron beams. This concept was first demonstrated with the successful experiments which converted the linear induction accelerator RADLAC II into an IVA fitted with a small 1-cm radius cathode magnetically immersed...
Topics: DTIC Archive, SANDIA NATIONAL LABS ALBUQUERQUE NM, *ELECTRON BEAMS, CATHODES, HIGH ENERGY,...
The Kepler mission was designed to determine the frequency of Earth-sized planets in and near the habitable zone of Sun-like stars. The habitable zone is the region where planetary temperatures are suitable for water to exist on a planet's surface. During the first 6 weeks of observations, Kepler monitored 156,000 stars, and five new exoplanets with sizes between 0.37 and 1.6 Jupiter radii and orbital periods from 3.2 to 4.9 days were discovered. The density of the Neptune-sized Kepler-4b is...
Topics: DTIC Archive, NAVAL OBSERVATORY FLAGSTAFF AZ, *PLANETS, ALBEDO, DENSITY, MASS, ORBITS, PHOTOMETERS,...
This paper proposes a new technique for solving near neighbor problems in the plane. We illustrate our method on the following two problems: 1. k-Nearest neighbor; Given a set S of n points in the plane and a query of the form (q,k), with a q a query point and k a positive integer, report the k points of S closest to q. 2. Circular Range Search: Given a set S of n points in the plane and a query of the form (q,d), with q a query point and d a positive real number, report all the points of S...
Topics: DTIC Archive, Chazelle,B, ILLINOIS UNIV AT URBANA APPLIED COMPUTATION THEORY GROUP, *ALGORITHMS,...
Carbon nanotube antennas and antenna arrays are discussed as possible nanoantennas in the GHz frequency range. Due to their exceedingly small radius, carbon nanotubes present unique measurement and simulation challenges, unlike those encountered in ordinary antenna applications. In this paper, we present preliminary results for measurement and simulation of carbon nanotube based antennas.
Topics: DTIC Archive, WISCONSIN UNIV-MILWAUKEE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE,...
The theory and first nonlinear simulations of the Rayleigh Taylor instability in the large ion Larmor radius limit (i.e., rho sub i/L 1) are presented. It is shown that in the large Larmor radius limit, the Rayleigh-Taylor instability evolves much faster and in a dramatically different manner than in the small Larmor radius limit. Keywords: Rayleigh Taylor instability; Early time structure; Large Larmor radius limit.
Topics: DTIC Archive, Huba, J D, NAVAL RESEARCH LAB WASHINGTON DC, *PLASMAS(PHYSICS),...
Insight into the efficient filling of space in systems of binary spheres is explored using bipyramids consisting of 3-to-8 n tetrahedra sharing a common pair of spheres. Compact packings are sought in bipyramids consisting of larger hard spheres of unit radius and smaller hard spheres of radius between .001 and 1. Seventy-seven distinct compact bipyramids are found. The number of distinct compact bipyramids increases with the number n of constituent tetrahedra. No compact bipyramids are found...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING...
In 1898 J. Kuerschak observed that the area of a regular 12-gon is = 3r square. This is variously generalized in the plane and in space. (Author)
Topics: DTIC Archive, Schoenberg,I J, WISCONSIN UNIV MADISON MATHEMATICS RESEARCH CENTER, *GEOMETRY,...
This report discusses the use of infinity norms to solve the problem of finding the minimum covering radius for a set of points. The minimum covering radius can be used as a measure of the accuracy of a collection of shots or a description of spall fragments. The algorithm worked well for the data sets investigated, sometimes converging in three iterations; however, in some cases, there were hundreds of iterations. For specific metrics, it would be possible to use directional derivatives to...
Topics: DTIC Archive, Thompson, Andrew A, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *RADIUS(MEASURE),...
This report presents the analyses, results and recommendations of an investigation into the specification and determination of a platform's roll radius of gyration and its influence on the measured or predicted roll response of a maritime platform. The investigation and report seek to resolve known deficiencies in the specification and determination of roll radius of gyration and provide direct guidance and supporting information to the experimenter and analyst to support ship motion analysis....
Topics: DTIC Archive, DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION FISHERMANS BEND (AUSTRALIA) MARITIME DIV,...
A physics-based, deformable soil model was developed for use in the U.S. Army's Tank Automotive Research, Development Engineering Center's (TARDEC) real-time vehicle-motion simulator. The power dissipated from the tires of the U.S. Army's 8-wheeled Stryker vehicle are predicted while the vehicle traverses a Unified Soils Classification System (USCS) CL soil type. The results from the following components of the model are presented: the vertical soil deformation of a single soil element due to...
Topics: DTIC Archive, TENNESSEE UNIV KNOXVILLE, *ENERGY, *MILITARY VEHICLES, *SOIL MODELS, FINITE ELEMENT...
The authors review an emerging paradigm of tropical cyclone intensification in the context of the prototype intensification problem, which relates to the spinup of a preexisting vortex near tropical storm strength in a quiescent environment. In addition, the authors review briefly what is known about tropical cyclone intensification in the presence of vertical wind shear. The authors go on to examine two recent lines of research that seem to offer very different views to understanding the...
Topics: DTIC Archive, MUNICH UNIV (GERMANY F R) METEOROLOGISCHES INST, *TROPICAL CYCLONES, INTENSITY,...
A new method of array modeling which will be used to predict the performance of low frequency active sonar arrays is being investigated. In support of this effort, a network representation of a spherical shell piezoelectric transducer was developed. The transducer was modeled using the finite-element code MARTSAM, from which a nodal description of the transducer was obtained. A procedure was developed to reduce and transform the nodal description of the transducer into a spherical harmonic...
Topics: DTIC Archive, McLean, Kathleen A, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *FREQUENCY, NETWORKS,...
This Technical Memorandum describes the methods used to fair data on vortices shed from a body in curved flow. The methods used to calculate local circulation density, total circulation density, apparent centre of total circulation, local vortex centre and local vortex core radius are described and empirical equations to represent the results are given.
Topics: DTIC Archive, Ward, B, ADMIRALTY RESEARCH ESTABLISHMENT GOSPORT (UNITED KINGDOM), *DENSITY,...
A mechanical plug gage is used for measuring face-on impulse in air blast close to spherical Pentolite explosives detonated in air at different ambient pressures. The data are compared with previous results. The study indicates that at small distances (z1.5 (ft/[cu.rt.lb]) the change in normally reflected impulse with variation in ambient pressure is negligible; it further suggests that the measured impulse, within several charge radii, of the explosive is due to the flow of the explosion gases...
Topics: DTIC Archive, Dewey, J M, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *BLAST, *BLAST...
Reduction in stress concentration in plates angular notches, by modifying the continuity of the notch without changing the radius of curvature, is attempted on the example of a plate of infinite dimensions with a quasi-square hole. For a plate of extended along the Ox axis by uniformly distributed forces, the reduced contour conditions for the opening are mathematically derived, and the maximum stress along the contour is calculated. A reduction in maximum stress by 20% was obtained by...
Topics: DTIC Archive, Chernyavskiy, D L, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC,...
In this article we address two questions: Why do freely evolving vortices weaken on average, even when the viscosity is very small? Why, in the fluid s interior, away from vertical boundaries and under the influence of Earth s rotation and stable density stratification, do anticyclonic vortices become dominant over cyclonic ones when the Rossby number and deformation radius are finite? The context for answering these questions is a rotating, conservative, Shallow-water model with Asymmetric and...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY, *ANTICYCLONES,...
High current charged particle beams can be guided by reduced density channels. This tracking occurs when the distribution of plasma currents in the density channel causes a net attractive force to be exerted on the electron beam. A relativistic electron beam injected parallel to a spatially offset reduced density channel is pulled toward the channel. The force exerted on the beam is predicted to increase as the beam current increases and as the offset between the beam and the channel increases...
Topics: DTIC Archive, Murphy, D P, NAVAL RESEARCH LAB WASHINGTON DC, *DENSITY, PLASMAS(PHYSICS), TRACKING,...
In this note we derive and examine the modal properties of the Azimuthally Propagating, Truncated, Cylindrical, Coaxial Waveguide. This guide is defined by an inner and outer radii, and a width. We derive the governing equations for the electromagnetic fields of the TEz and TMz azimuthally propagating modes. First, the characteristic equations that define the propagation constants of each mode are derived; then, the electric and magnetic fields are explicitly expressed. With these results the...
Topics: DTIC Archive, Courtney, Clifton C, VOSS SCIENTIFIC LLC ALBUQUERQUE NM, *ELECTROMAGNETIC FIELDS,...
The interaction force between a rigidly displaced relativistic electron beam and a performed channel is analyzed. The displacement is not assumed to be small. It is found that two types of equilibria can exist, either on axis with respect to the channel or displaced from the channel by a prescribed amount. The location of the equilibrium depends on the ratio of beams radius to channel radius and the types of channels.
Topics: DTIC Archive, Hui, B, NAVAL RESEARCH LAB WASHINGTON DC, *COMPUTATIONS, *ELECTRON BEAMS, *NUMERICAL...
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 the TC maximum wind radius and the 35, -50, and 100-kt radii are...
Topics: DTIC Archive, Magnan, Scott G., NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *RADIUS(MEASURE), *TROPICAL...
Three derivations of the standard formula for the curvature K of a plane curve y(x) are reviewed. Curvature is equal to 1 / r , where r is the radius of curvature, and is thus needed to compute the centripetal acceleration of a particle traversing that path. As an example, the centripetal and tangential accelerations are calculated for a projectile on its parabolic trajectory.
Topics: DTIC Archive, NAVAL ACADEMY ANNAPOLIS MD DEPT OF PHYSICS, *ANGULAR ACCELERATION, *CURVATURE,...
The achievable gain in the radiation resistance and directivity of a low frequency underwater transducer due to the presence of an array of sympathetic resonators was analyzed. The resonators were all taken to be air bubbles, and both the resonators and transducer were taken to be compact (ka1) . The resonators were taken to be equally spaced around a circle of radius R, with the transducer located on the axis. The gain was calculated for various numbers of resonators as a function of ka...
Topics: DTIC Archive, Ellsworth, John M, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ARRAYS, RESONATORS,...
The United States destroyer force underwent significant design improvement during the Interwar Period. The roles and missions of the destroyers evolved from WW I to the end of WW II, based on design and tactics improvements, as well as the overall expansion of the number of destroyers and the improved capabilities of destroyers. This was especially true of the Fletcher class, introduced during the end of the interwar period. The Fletcher class became the largest single type and class of warship...
Topics: DTIC Archive, ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS, *DESTROYERS, *NAVAL...
This paper presents an SQP-based interior point technique for solving the general nonlinear programming problem using trust region globalization and the Coleman-Li scaling. The SQP subproblem is decomposed into a normal and a reduced tangential subproblem in the tradition of numerous works on equality constrained optimization, and strict feasibility is maintained with respect to the bounds. This is intended to be an extension of previous work by Coleman & Li and Vicente. Though no...
Topics: DTIC Archive, Das, Indraneel, INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING...
At times it becomes desirable to estimate the depths of rivers using aerial photography or other remotely sensed imagery. Due to water turbidity in many of the cases, optical techniques using water color or laser bathymetry are not feasible. This preliminary study investigates the potential use of meander geometry based on empirical equations as a possible method for the estimation of river depths for natural alluvial streams and rivers.
Topics: DTIC Archive, Mesick, Hillary C, NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV,...
The purpose of this report is to set forth a new set of cirrus cloud models for use with the MODTRAN4 atmospheric transmission model and to provide a wider range of cirrus models with which to investigate future remote sensing techniques that may have to observe through cirrus. The cirrus cloud models were derived by selecting mode particle sizes between and beyond the two existing cirrus cloud models in MODTRAN4: Standard (mode particle radius 64 micrometers) and subvisual (mode 4...
Topics: DTIC Archive, Mazuk, Steve, AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS, *ATMOSPHERE MODELS,...
Radius tailoring is an important step towards intense relativistic electron beam (IREB) conditioning. A well conditioned beam propagates relatively stably in a self pinched mode in high neutral pressure gas environments. Low pressure Ion Focus Regime (IFR) cells are simple but very versatile radius or emittance tailoring cells since they allow flexibility in the adjustment of all major conditioning parameters. In addition they provide an efficient beam transport medium as well as some weak...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV, *ELECTRON BEAMS, EFFICIENCY, GAS...
In the development of numerical atmospheric models, many simplifying assumptions are made. One of the simplifying assumptions is that the Earth can be represented as a sphere. This assumption greatly simplifies the complexity of the resulting equation set that needs to be solved and makes them more tractable. It also reduces the computational cost. The Synthetic Environmental Data Representation and Interface Specification (SEDRIS) Spatial Reference Model (SRM), ISO/IEC 18026, defines a...
Topics: DTIC Archive, Hembree, Louis A, NAVAL RESEARCH LAB MONTEREY CA MARINE METEOROLOGY DIV, *WEATHER,...
In this report a simple model of the bubble formed by detonating a limpet mine in contact with a plane surface is developed. The key features are the assumption of a hemispherical bubble and the account taken of the outflow of detonation products from the bubble through the hole caused by the detonation. The outflow of the gas is assumed to be one dimensional. The equations describing the time variation of the bubble radius are solved for various values of the physical parameters describing the...
Topics: DTIC Archive, Best, John P., DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA),...
Every three years the IAU Working Group on Cartographic Coordinates and Rotational Elements revises tables giving the directions of the poles of rotation and the prime meridians of the planets, satellites, minor planets, and comets. This report takes into account the IAU Working Group for Planetary System Nomenclature (WGPSN) and the IAU Committee on Small Body Nomenclature (CSBN) definition of dwarf planets, introduces improved values for the pole and rotation rate of Mercury, returns the...
Topics: DTIC Archive, NAVAL OBSERVATORY WASHINGTON DC, *ROTATION, *COORDINATES, *PLANETS, ARTIFICIAL...
The effect of signal and background shot noise, as well as device noise, on the performance of a direct-detection spatial tracking system is investigated for arbitrary detectors as a function of background radiation and detector radius is then analyzed and compared with some performance bounds. APD- and PIN-based tracking systems also are compared. The effects of non-focal-plane processing, focus error, and pupil walk on tracking performance are investigated. Experimental results of a 2.4-kHz...
Topics: DTIC Archive, Swanson, Eric A, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *BACKGROUND...
The use of centrifuges for human research has been reported for almost 200 years. Centrifuges have been used for research, medical treatment, and training of flight crew. These centrifuges have been designed and built in a variety of configurations with arms as short as 1.5 m and as long as 15 m. Acceleration on a centrifuge is usually measured in Gs which is the acceleration divided by the standard acceleration of gravity. The forces encountered in a centrifuge are the simple application of...
Topics: DTIC Archive, Meeker, Larry J, ARMSTRONG LAB BROOKS AFB TX, *INERTIA, FLIGHT CREWS, HUMANS,...
This paper reviews the present-day data on the spacial distribution of orbits and the motion of characteristic objects in the asteroid belt. The distribution of asteroids as a function of their stellar magnitudes, radii, and masses is also considered. Particular attention is devoted to the influence of the selection effects on the statistics and to explanation of the characteristics of the distribution in terms of the gravitational theory and collisional fragmentation of bodies. This paper...
Topics: DTIC Archive, Chebotarev,G A, NAVAL INTELLIGENCE SUPPORT CENTER WASHINGTON D C TRANSLATION DIV,...
Forty row charges were fired in the Albuquerque fan-delta alluvium to define row-charge crater dimensions in terms of charge burial depth and the spacing between charges in the row. Sixty single charges were detonated at various burial depths for comparison. The factors limiting equivalence between row-charge craters and continuous line-charge craters are defined in terms of length of the row charge and also in terms of both burial depth and spacing. When the most efficient charge spacing was...
Topics: DTIC Archive, Vortman, L J, SANDIA CORP ALBUQUERQUE NM, *NUCLEAR EXPLOSIONS, *CRATERING, *CRATERS,...
A set of criteria is proposed for the onset of structure caused by the unmagnetized ion Rayleigh-Taylor instability in magnetically confined plasma expansions. R sub C, the critical radius at which structure can begin to develop, is independent of the magnetic field. There is a critical value of laser energy that needs to be exceeded for structure to develop. These criteria are consistent with available experimental data from AMPTE and the DNA/NRL laser experiment. A series of laser experiments...
Topics: DTIC Archive, Huba,J D, NAVAL RESEARCH LAB WASHINGTON DC, *PLASMAS(PHYSICS), RADIUS(MEASURE),...
