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2.0
audio
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Topics: Radio Program, Cartography, Remote sensing, Photography, Computer data, Metals, Walls, Chemical...
21
21
Feb 6, 2019
02/19
by
DOTO Database & Jamiat Ulema e Hind
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Muslims House Burnt In Communal Attack Over Altercation In Palwal, Haryana.
Topics: doto, dotodatabse, jamiat, jamiat ulema e hind, quill foundation, tension, communal attack,...
From the bitsavers.org collection, a scanned-in computer-related document. xerox :: sdd :: memos 1977 :: 19771017 Volume File Map Implementation
Topics: file, volume, map, bytes, files, descriptors, fileld, disk, hash, draft, volume file, file map,...
Subsolidus lithospheric thinning by mantle plumes may be involved in the creation of swells, hotspots, and rifts. Among the major questions concerning this process are the timescale on which it occurs and the structure of the plumes. The lithosphere is known to have been substantially thinned in 10 Ma or less. Current studies are focused on the lithospheric thinning by time-dependent plumes hypothesized to have large temperature differences across them.
Topics: NASA Technical Reports Server (NTRS), CONVECTIVE HEAT TRANSFER, GEOLOGICAL FAULTS, LITHOSPHERE,...
Thermal and structural finite-element analyses were performed on the first high pressure fuel turbopump turbine blade of the space shuttle main engine (SSME). A two-dimensional (2-D) finite-element model of the blade and firtree disk attachment was analyzed using the general purpose MARC (finite-element) code. The loading history applied is a typical test stand engine cycle mission, which consists of a startup condition with two thermal spikes, a steady state and a shutdown transient. The blade...
Topics: NASA Technical Reports Server (NTRS), SPACE SHUTTLE MAIN ENGINE, FINITE ELEMENT METHOD, STRUCTURAL...
A primary concern of aircraft structure designers is the accurate simulation of the blade-out event and the subsequent windmilling of the engine. Reliable simulations of the blade-out event are required to insure structural integrity during flight as well as to guarantee successful blade-out certification testing. The system simulation includes the lost blade loadings and the interactions between the rotating turbomachinery and the remaining aircraft structural components. General-purpose...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ENGINES, AIRCRAFT STRUCTURES, DYNAMIC STRUCTURAL...
A lightweight energy-absorbing keel-beam concept was developed and retrofitted in a general aviation type aircraft to improve crashworthiness performance. The energy-absorbing beam consisted of a foam-filled cellular structure with glass fiber and hybrid glass/kevlar cell walls. Design, analysis, fabrication and testing of the keel beams prior to installation and subsequent full-scale crash testing of the aircraft are described. Factors such as material and fabrication constraints, damage...
Topics: NASA Technical Reports Server (NTRS), GENERAL AVIATION AIRCRAFT, COMPOSITE STRUCTURES, KEELS,...
This paper describes the development of a methodology for sizing Blended-Wing-Body (BWB) transports and how the capabilities of the Flight Optimization System (FLOPS) have been expanded using that methodology. In this approach, BWB transports are sized based on the number of passengers in each class that must fit inside the centerbody or pressurized vessel. Weight estimation equations for this centerbody structure were developed using Finite Element Analysis (FEA). This paper shows how the...
Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, AIRCRAFT DESIGN, FLIGHT OPTIMIZATION,...
A finite element model was developed to solve for the acoustic pressure field in a nonhomogeneous region. The derivations from the governing equations assumed that the material properties could vary with position resulting in a nonhomogeneous variable property two-dimensional wave equation. This eliminated the necessity of finding the boundary conditions between the different materials. For a two media region consisting of part air (in the duct) and part bulk absorber (in the wall), a model was...
Topics: NASA Technical Reports Server (NTRS), AEROACOUSTICS, EXPERIMENT DESIGN, FINITE ELEMENT METHOD,...
Electronic time-average holograms are convenient for comparing the measured vibration modes of fan blades with those calculated by finite-element models. At the NASA Lewis Research Center, neural networks recently were trained to perform what had been a simple visual comparison of the predictions of the design models with the measurements. Finite-element models were used to train neural networks to recognize damage and strain information encoded in subtle changes in the time-average patterns of...
Topics: NASA Technical Reports Server (NTRS), NEURAL NETS, COMPACTING, DESIGN ANALYSIS, TIME MEASUREMENT,...
GRCop-84 (Cu-8 at.% Cr-4 at.% Nb) was developed at the NASA Glenn Research Center for use in regeneratively cooled rocket engines. This alloy possesses an excellent combination of conductivity, thermal expansion, strength, creep resistance, ductility, and low-cycle fatigue (LCF) life. In comparison to the currently used alloy, NARloy-Z (Cu-3 wt % Ag-0.5 wt % Zr), GRCop-84's significantly better properties give it the potential for significant gains in engine performance and reliability. For...
Topics: NASA Technical Reports Server (NTRS), ALLOYS, MECHANICAL PROPERTIES, ROCKET ENGINES, THERMOPHYSICAL...
The design and analysis of the James Webb Space Telescope (JWST) Integrated Science Instrument Model (ISIM) structural requirements is presented.
Topics: NASA Technical Reports Server (NTRS), JAMES WEBB SPACE TELESCOPE, SYSTEMS INTEGRATION, MODELS,...
Topics: Radio Program, Global conflicts, Secular holidays, Sustainable development, March observances,...
Modifications and additions incorporated into the BOPACE 3-D program are described. Updates to the program input data formats, error messages, file usage, size limitations, and overlay schematic are included.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, FINITE ELEMENT METHOD, PLASTICS,...
An exact solution for the stress field within a rectangular slab of orthotropic material is found using a two dimensional Fourier series formulation. The material is required to be in plane stress, with general stress boundary conditions, and the principle axes of the material must be parallel to the sides of the rectangle. Two load cases similar to those encountered in materials testing are investigated using the solution. The solution method has potential uses in stress analysis of composite...
Topics: NASA Technical Reports Server (NTRS), ELASTIC PROPERTIES, ORTHOTROPIC PLATES, PLANE STRESS,...
From the bitsavers.org collection, a scanned-in computer-related document. ibm :: 1620 :: programs :: 9.4.015 Simultaneous Equation Solution and Matrix Inversion with Complex Values
Topics: matrix, program, format, mag, simultaneous, equation, inversion, commen, appendix, fortran,...
The results of an analytical and experimental investigation of 4-ply Kevlar-49-epoxy panels loaded by in-plane shear are presented. Approximately one-half of the panels are thin-core sandwich panels and the other panels are solid-laminate panels. Selected panels were impacted with an aluminum sphere at a velocity of either 150 or 220 ft/sec. The strength of panels impacted at 150 ft/sec was not reduced when compared to the strength of the undamaged panels, but the strength of panels impacted at...
Topics: NASA Technical Reports Server (NTRS), EPOXY MATRIX COMPOSITES, IMPACT TESTS, IMPACT LOADS, CYCLIC...
A mathematical model, termed the Slug Loss Model, has been developed for describing thermal capacitance (slug) calorimeter behavior when heat losses and other decaying processes are not negligible. This model results in the temperature time slope taking the mathematical form of exponential decay. When data is found to fit well to this model, it allows a heat flux value to be calculated that corrects for the losses and may be a better estimate of the cold wall fully catalytic heat flux, as is...
Topics: NASA Technical Reports Server (NTRS), CALORIMETERS, TEMPERATURE EFFECTS, MATHEMATICAL MODELS, HEAT...
The National Aeronautics and Space Administration (NASA) and Pratt & Whitney Rocketdyne are developing a liquid oxygen/liquid hydrogen rocket engine for future upper stage and trans-lunar applications. This engine, designated the J-2X, is a higher pressure, higher thrust variant of the Apollo-era J-2 engine. The contract for development was let to Pratt & Whitney Rocketdyne in 2006. Over the past several years, development of the gas generator for the J-2X engine has progressed through...
Topics: NASA Technical Reports Server (NTRS), HYDROGEN OXYGEN ENGINES, J-2 ENGINE, THRUST, DESIGN ANALYSIS,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), INTRACRANIAL PRESSURE, MICROGRAVITY, EYE (ANATOMY),...
A finite element program was constructed to model the mechanical response of a tire, treated as a deep anisotropic shell, to specified static loads. The program is based on a Sanders Budiansky type shell theory with the effects of transverse shear deformation and bending-extensional coupling included. A displacement formulation is used together with a total Lagrangian description of the deformation. Sixteen-node quadrilateral elements with bicubic shape functions are employed. The Noor basis...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT TIRES, ANISOTROPIC SHELLS, COMPUTER PROGRAMS,...
Quasi-static tests have been performed on triaxially braided carbon fiber composite materials with large unit cell sizes. The effects of different fibers and matrix materials on the failure mode were investigated. Simulations of the tests have been performed using the transient dynamic finite element code, LS-DYNA. However, the wide range of failure modes observed for the triaxial braided carbon fiber composites during tests could not be simulated using composite material models currently...
Topics: NASA Technical Reports Server (NTRS), FAILURE MODES, BRAIDED COMPOSITES, CARBON FIBERS, COMPOSITE...
The finite element method (FEM) is a numerical algorithm for solving second order differential equations. It has been successfully used to solve many problems in atomic and molecular physics, including bound state and scattering calculations. To illustrate the diversity of the method, we present here details of two applications. First, we calculate the non-adiabatic dipole polarizability of Hi by directly solving the first and second order equations of perturbation theory with FEM. In the...
Topics: NASA Technical Reports Server (NTRS), FINITE ELEMENT METHOD, DIFFERENTIAL EQUATIONS, ATOMIC...
The design and construction of a thruster that employs electrodeless plasma preionization and pulsed inductive acceleration is described. Preionization is achieved through an electron cyclotron resonance discharge that produces a weakly-ionized plasma at the face of a conical theta pinch-shaped inductive coil. The presence of the preionized plasma allows for current sheet formation at lower discharge voltages than those employed in other pulsed inductive accelerators that do not employ...
Topics: NASA Technical Reports Server (NTRS), PLASMA ACCELERATORS, MICROWAVES, MAGNETIC FIELDS, ELECTRON...
Topics: Radio Program, Deaths from myocardial infarction, Fictional criminals, Transition metals, Chemical...
No abstract available
Topics: NASA Technical Reports Server (NTRS), STRUCTURAL HEALTH MONITORING, CRAWLER TRACTORS, FIELD TESTS,...
23
23
Feb 8, 2016
02/16
by
Kenneth Udut
movies
eye 23
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#Live #population of #earth #births and #deaths. Cool-MYEbE2imHDI.mp4 Live population of earth births and deaths Cool MYEbE2imHDI mp4 Live population earth births deaths
Topics: undergo, people, hide, experience, element, concern, collection, collection, be, Live, population,...
0
0.0
Jan 16, 2021
01/21
by
togan yh (Tsarmanil)
data
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Réplique des pierres du film Le Cinquième Élément
Topics: thingiverse, pierre, The_5th_element, Other, stl
Topics: Radio Program, Business terms, Military intelligence, Military, Continents, Proving grounds,...
Topics: Radio Program, Radioactivity, County seats in Texas, Dairy products, Refrigerants, Nuclear physics,...
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,...
The turbulent flow over a NACA 4412 airfoil at angle of incidence corresponding to maximum lift (12 degree) has been computed via large-eddy simulation. Two different numerical approaches, one based on a conventional structured mesh and one with a more economical unstructured mesh, have been employed. Results from both simulations differ considerably from each other and from the available experimental data. Differences are found with respect to occurrence of transition near the suction peak and...
Topics: DTIC Archive, Moin, Parviz, STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING, *TURBULENT FLOW,...
A methodology was developed for the structural analysis of composite rotor blades.This coupled-beam analysis is relatively simple to use compared with alternative analysis techniques. The beam analysis was developed for thin-wall single-cell rotor structures and includes the effects of elastic coupling. This paper demonstrates the effectiveness of the new composite-beam analysis method through comparison of results of the coupled-beam analysis with those of an established baseline analysis...
Topics: DTIC Archive, Hodges, Robert V., NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY...
6
6.0
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eye 6
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Topics: Radio Program, Motherhood, Men, Fatherhood, Philosophical terminology, Women, Family, Marriage,...
Since last year, a number of expanded capabilities have been added to the modeler. The support the integration with thermal modeling, the program can now produce simplified thermal models with the same geometric parameters as the more detailed dynamic and even more refined stress models. The local mesh refinement and mesh improvement tools have been expanded and more user friendly. The goal is to provide a means of evaluating both monolithic and segmented mirrors to the same level of fidelity...
Topics: NASA Technical Reports Server (NTRS), SPACEBORNE TELESCOPES, MIRRORS, SEGMENTED MIRRORS, MOUNTING,...
A method is presented to represent the large-deformation kinematics of intraply matrix cracks and delaminations in continuum damage mechanics (CDM) constitutive material models. The method involves the additive decomposition of the deformation gradient tensor into 'crack' and 'bulk material' components. The response of the intact bulk material is represented by a reduced deformation gradient tensor, and the opening of an embedded cohesive interface is represented by a normalized cohesive...
Topics: NASA Technical Reports Server (NTRS), MATRIX MATERIALS, CRACKS, DAMAGE, CONTINUUM MECHANICS,...
Topics: Radio Program, Military, Meteorology, Divided regions, Republics, Family, Crime, Single-party...
Topics: Radio Program, Planetary science, NPR programs, Containers, Space telescopes, Telescopes, Planetary...
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6.0
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eye 6
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Topics: Radio Program, Western Europe, Commanders of the Order of the British Empire, English atheists,...
Single point incremental forming (SPIF) has a great contribution in industrial practice, because the desired parts such as the small-batch production and prototype products can be manufactured just by changing the punch tools and supports. The sheet is formed into desired part using punch tools by producing local plastic deformations at the contact locations based on designed tool paths. This research work is aimed to investigate the formability of SPIF process over the numerical simulations in...
Topics: Single Point Incremental Forming, Finite Element Model, Thinning Location, Base Plate Configuration...
4
4.0
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Topics: Radio Program, Metals, Infancy, Mexican-American culture, Chicano, Chemical element groups,...
7
7.0
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Topics: Radio Program, Rock and Roll Hall of Fame inductees, Deaths from myocardial infarction, American...
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10.0
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Topics: Radio Program, Magnetism, Electromagnetism, Concepts in physics, Magnetostatics, Space plasmas,...
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12
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Topics: Radio Program, Retailing, Machines, Civil disobedience, Nonviolence, BBC World Service, Political...
A method for the simultaneous measurement of both longitudinal and flexural wave intensities in beams is developed and measurements are then conducted on three specimens: a straight beam, a continuous T-beam, and a bolted T-beam. The work demonstrates that discontinuities in structures help to interchange large amounts of power between the two wave types. The straight beam serves to validate the measurement techniques. Successful comparisons are made to predicted power levels on a finite...
Topics: DTIC Archive, Szwerc, Richard P., NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SHIP...
While the vibration analysis of gear systems has been developed, a systematic approach to the reduction of gearbox vibration has been lacking. The technique of reducing vibration by shifting natural frequencies is proposed here for gearboxes and other thin-plate structures using the theories of finite elements, modal analysis, and optimization. A triangular shell element with 18 degrees of freedom is developed for structural and dynamic analysis. To optimize, the overall vibration energy is...
Topics: DTIC Archive, Inoue, Katsumi, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS...
Propagation of seismic waves in the nearfield where rock rheology is demonstrably nonlinear raises unique difficulties. Nonlinearity arises primarily in two forms at intermediate to large strains: (1) nonlinear elasticity, and (2) amplitude-dependent attenuation. The proper representation of nonlinear constitutive equations for rocks in the regime is a potentially important ingredient of quantitative source models. We have shown previously that nonlinear one-dimensional wave propagation can...
Topics: DTIC Archive, Minster, Jean-Bernard, SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA INST OF...
The damping behavior of Aluminum-Epoxy composites has been successfully predicted by using the finite element method. It was shown that the loss factor of a given composite depends on morphology and volume percent of component phases. For a given volume percent of Aluminum or Epoxy, the loss factor is found to increase with an increase in relative particle size. This was attributed to the ability of the high damping epoxy phase to damp/deform relatively freely when the particle size was...
Topics: DTIC Archive, Ankem, S., MARYLAND UNIV COLLEGE PARK, *COMPOSITE MATERIALS, *FINITE ELEMENT...
TRANSOM is a multi-block, multi-method Reynolds-Averaged Navier Stokes solver being developed at DREA to address problems associated with the flow around ships and submarines. It is multi-block because the flow is divided into several distinct regions. It is multi-method because a different solution method may be used on each of the flow regions. At present two different methods of solution can be chosen; a finite-volume solver based on the pseudo-compressibility method; and a finite element...
Topics: DTIC Archive, Hally, David, DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA),...
The eight node, first order hexahedron finite element in the NONSAP structural analysis program has been modified to simulate an ideal compressible fluid. This element, based on the displacement formulation, is then incorporated into the STAGS finite element program. The effectiveness of this fluid finite element is demonstrated by computing the transient response of two submerged fluid-coupled cylindrical elastic shells impinged upon by a transversely incident plane pressure pulse and...
Topics: DTIC Archive, Kiddy,Kenneth C, NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD, *COMPUTERIZED...
