SURFACE ANALYSIS - Storming Media

Application of Surface Analysis Techniques to Pulsed Power Problems

23 MAR 1981

Authors: G. L. Jackson; TEXAS TECH UNIV LUBBOCK DEPT OF ELECTRICAL ENGINEERING

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

An assessment of some of the advantages and disadvantages of various surface analysis techniques applied to the analysis of both the insulators and conductors used in high voltage spark gaps is presented. Some of the analysis techniques introduced include Electron Spectroscopy for Chemical Analysis, Auger Electron Spectroscopy, X-ray Fluorescence, and Secondary Ion Mass Spectroscopy. The purpose of this review is to present some of these analysis techniques with emphasis placed ...

Acoustical Interferometry

MAR 1981

Authors: Weldon F. Swinson; ARMY MISSILE COMMAND REDSTONE ARSENAL AL GROUND EQUIPMENT AND MISSILE STRUCTURES DIRECTORATE

Real-time acoustical interferometry is one of the most promising techniques in experimental mechanics. Engineers need stress and strain information both on the surface of an object as well as the interior to locate critical points (points of highest stress) for structural evaluation of any design. Acoustic waves have the potential to give this information. They are nondestructive, do not alter the performance of what is being examined, and carry information ...

The Wear of Polymers by Transfer to Hard, Rough Surfaces.

27 FEB 1981

Authors: Norman S. Eiss Jr; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING

A surface topography characterization system consisting of a talysurf 4 profilometer, Zonic analog-to-digital converter and Fast Fourier Transform (FFT), and a Tetronix 4051 minicomputer was interfaced to an IBM 370 digital computer. Software for the computation of several surface parameters and for wear models have been written. Single traversal wear experiments were performed on a pin-on-disk machine at sliding velocities less than 1 cm/s. Experiments run at a constant bearing ...

A Surface Damage Investigation on Uniaxial Tensile Test Specimens Prepared by Common Cutting Methods

FEB 1981

41 pages

Authors: Thomas J. C. Chew; Dale A. Wells; AIR FORCE ROCKET PROPULSION LAB EDWARDS AFB CA

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An experimental investigation was conducted to evaluate propellant test specimen surface damage caused by three common cutting methods, each operated at three different speeds. The three methods were guillotine cutting, sawing and milling. For each set of cutting conditions (method and speed), six specimens were obtained. Three of these specimens were subjected to surface damage evaluation using a scanning electron microscope. The remaining three specimens were subjected to uniaxial tensile ...

Surface Enhancement of Silicon Carbide Filament for Metal Matrix Composites

JAN 1981

Authors: R. J. Suplinskas; H. DeBolt; AVCO SPECIALTY MATERIALS DIV LOWELL MA

The first year's efforts on this program were aimed at understanding the mechanisms of strengthening and degradation of SiC filament. Filaments were provided for analysis here in part by Avco IRAD and other related programs listed at the end of this report. The specific objectives were: (1) Devise a model for filament strengthening/degradation effects due to the presence of surface layer's or coatings on a brittle ceramic filament; (2) Determine ...

Rapid Ultrasonic Inspection of Artillery Projectiles.

NOV 1980

Authors: Robert E. Lee; Len T. Spragins; Frank Barr; Joseph H. Mulherin; ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

This report describes the development of an automated ultrasonic inspection system for nondestructive evaluation of M549 (RAP) artillery projectiles using electromagnetic acoustic transducers (EMATs). The technical effort culminated in the successful demonstration of the inspection system to an engineering team from ARRADCOM and the subsequent delivery of the unit to the ARRADCOM facility in Dover, New Jersey.

A Collection of Data from Test of Full-Scale Missiles to Define Plume Influence on Aerodynamics

SEP 1980

Authors: T. A. Martin; ARMY MISSILE COMMAND REDSTONE ARSENAL AL SYSTEMS SIMULATION AND DEVELOPMENT DIRECTORATE

Data obtained during a series of tests to determine plume influence on the aerodynamics of a typical high thrust missile are presented. Pressure measurements were obtained over the rear surface of the missile as the sled carried it through the Mach number range of 0.8 to 1.6 as the motor was fired. Portions of these data are influenced by flow disturbances emanated from the carrier sled, other portions are free ...

Theoretical Properties of Acoustical Speckle Interferometry

SEP 1980

Authors: W. F. Ranson; ARMY MISSILE COMMAND REDSTONE ARSENAL AL GROUND EQUIPMENT AND MISSILE STRUCTURES DIRECTORATE

Acoustical speckle interferometry is based locally on the elastodynamic response of solids subjected to ultrasonic waves. The presence of a subsurface layer or discontinuity generally produces a change in the wave propagating in a medium. Acoustical speckle interferometry utilizes the reflection, refraction, and mode conversion of incident elastic waves at the interface of two elastic media as a basic description of the transmission and reflection of elastic waves. Basic equations ...

A General Surface Representation Module Designed for Geodesy,

JUN 1980

167 pages

Authors: Hans Suenkel; OHIO STATE UNIV COLUMBUS DEPT OF GEODETIC SCIENCE

Technological developments during the last decade have provided geodesists with the capability of obtaining enormous amounts of data on and outside the surface of the earth. In order to understand the general behavior of the data, a graphical representation of the data is useful. This type of representation can be obtained by using GSPP, Geodetic Science Plotting Package, a set of FORTRAN IV subroutines. This report describes the various algorithms ...

Free Surface Properties of III-V Compound Semiconductor Surfaces.

JUN 1980

Authors: A. Kahn; PRINCETON UNIV NJ

Studies of free compound semiconductor surfaces as well as gas-solid and metal-solid interaction are summarized. An experimental and theoretical analysis of the GaAs(110) surface reconstruction was conducted and applied to three additional compounds: InSb, InP and ZnTe. Attempts were made to relate the type and the magnitude of the surface reconstruction of these materials to the covalent-ionic character of the bonding. Knowledge of the atomic reconstructions of these surfaces was ...

PROFILE: A General Code for Fitting Ion Beam Analysis Spectra.

APR 1980

Authors: A. Niiler; R. Birkmire; J. Gerrits; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

A general program for analyzing energy distributions of particles scattered in ion beam experiments has been developed. This program uses numerical integration methods to model elastic scattering and nuclear reaction spectra from known cross sections, energy loss data and assumed depth concentration profiles of surface constituents. Direct comparison of the predicted and experimental distributions yields detailed, quantitative information about these depth concentration profiles in a complicated surface. The program is ...

An Investigation of the Heat Transfer at the Liquid/Solid Interface of Rapidly Melting Ice.

25 MAR 1980

Authors: Joseph Edward Fredley; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

This paper describes an experimental and analytical investigation of a system capable of rapidly melting ice. The melting technique used involved forcing a cylindrical ice slug against a heated surface, letting the effluent fluid exit radially. An analytical model based on fundamental physical principles was developed and used to predict the behavior of the system. Liquid layer thickness, liquid bulk temperature, radial pressure distribution in the liquid layer, convective heat ...

Statistical Characterization of Rough Terrain,

FEB 1980

42 pages

Authors: John F. Lennon; Robert J. Papa; ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY

A technique is presented to statistically characterize rough terrain surfaces. The approach is described in terms of a specific example but in principle is quite general and can be adapted to fit any number of situations. The starting point is the use of observed surface height data to generate statistical parameters for probability density functions (PDF) that potentially characterize the data. This involves the use of parameter estimation techniques. The ...

System Data File (SDF) for the Intrasystem Analysis Program (IAP) Surface Geometry.

DEC 1979

Authors: RIchard Robertson; ATLANTIC RESEARCH CORP ALEXANDRIA VA

This report describes a general methodology for digitally storing the three-dimensional shape of geometric surfaces. This methodology has been developed for application with the Electromagnetic Compatibility/Intrasystem Analysis Program. Provisions are made for storage of the surface definition data on the System Data File. The file builder must be throughly familiar with the contents of this report before attempting to collect the geometric data.

Rapid Ultrasonic Inspection of Artillery Projectiles. Revision.

NOV 1979

Authors: Murray W. Mahoney ; Joseph H. Mulherin; ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Results of a 3-month study to evaluate metallurgical and acoustic properties of HF-1 steel are presented. The objectives were to determine the cause of and solution for reduced ultrasonic signal generation efficiencies evident during ultrasonic inspection of M549 (RAP) artillery projectiles with electromagnetic acoustic transducers(EMATs). It was shown that reduced generation efficiencies were the result of an in-process heat-treatment during fabrication and that the phenomenon was limited to the first ...

Sequins and Quills - Representations for Surface Topography.

MAY 1979

Authors: Berthold K. P. Horn; MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB

The shape of a continuous surface can be represented by a collection of surface normals. These normals are like a porcupine's quills. Equivalently, one can use the surface patches on which these normals rest. These in turn are like sequins sewn on a costume. These and other representations for information which can be obtained from images and used in the recognition and description of objects in a scene are briefly ...

Characterization of Surfaces in Wear Tests.

1979

Authors: N. S. Eiss Jr; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG

Raman Spectra of Possible Corrosion Products of Iron.

JUN 1978

Authors: Richard J. Thibeau; Chris W. Brown; Robert H. Heidersbach; RHODE ISLAND UNIV KINGSTON DEPT OF OCEAN ENGINEERING

Raman spectra of FeO, Fe3O4, alpha-Fe2O3, alpha-FeOOH, and gamma-FeOOH, the common products of iron oxidation, have been measured. The spectra of FeO and Fe3O4 appear to be identical. Armco iron oxidized in air at 250 C was examined by Raman spectroscopy after varying periods of exposure and the surface film was found to contain Fe3O4 and alpha-Fe2O3.

Interpolating Surfaces: High Order Convergence Rates and Their ASsociated Designs, with Application to X-Ray Image Reconstruction.

MAY 1978

Authors: Grace Wahba; WISCONSIN UNIV-MADISON DEPT OF STATISTICS

Consider the problem of interpolating a function on the unit square from values of the function given on a set (called the design) of N discrete points. Then some new results are obtained on better ways to distribute these N points so as to minimize the maximum interpolation error.

On Scattering from a Moving Rough Surface without a Kirchhoff or a Farfield Approximation,

18 APR 1978

Authors: William A. Kuperman; SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)

A Fundamental Approach to Adhesion: Synthesis, Surface Analysis, Thermodynamics and Mechanics

FEB 78

147 pages

Authors: Wen Chen; David W. Dwight; James P. Wightman; VIRGINIA POLYTECHNIC INST BLACKSBURG DEPT OF CHEMISTRY

This report is the fifth of a series of studies on new adhesives, adherends, and interfaces of importance to NASA. Our experimental program mainly employs modern surface analysis techniques to characterize the physical structures and chemical constituents of surfaces before and after bonding and fracture. Table I summarizes the principal areas of effort overall. Two publications submitted during the current grant period are included in the Appendix. (MM)

Photoemission Electron Microscopy: Another Powerful Tool for the Microscopist.

22 DEC 1977

Authors: A. Sosin; OFFICE OF NAVAL RESEARCH LONDON (ENGLAND)

Photoemission Electron Microscopy, largely unknown in the United States, is an actively employed technique in several European laboratories. This report described microscope design, image formation and contrast considerations, resolution and depth of information, and application. Photographs illustrate varying applications in metals, ceramics and semiconductors. (Author)

Initial Phase in the Development of an Automatic, Optical Scatter Inspection Station.

DEC 1977

Authors: Edward G. Kessler; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB

The goal of this program is to develop an automated, optical inspection station useful on a spectrum of munition related components. Laser scatter is composed of speckle whose exact distribution cannot be predicted. However, its envelope can be used to typify the surface profile. Thus, the ability to detect surface features is a function of the ability to resolve this envelope which, in turn is a function of the number ...

Initial Phase in the Development of an Automatic, Optical Scatter Inspection Station.

DEC 1977

Authors: Edward G. Kessler; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB

Oscillatory Transport Coefficients in InAs Surface Layers.

15 AUG 1977

Authors: H. A. Washburn; J. R. Sites; COLORADO STATE UNIV FORT COLLINS DEPT OF PHYSICS

The resistivity and Hall coefficient of gated n-InAs epilayers have been measured at low temperatures utilizing differential techniques and a magnetic field swept from zero to six tesla. When the InAs surface is in accumulation, three distinct series of oscillations, periodic in inverse magnetic field, are observed. The temperature and magnetic field dependence of the oscillation amplitudes suggests an effective mass of .04 m sub e and a Dingle temperature ...

Molecular-Beam Epitaxy (MBE) of In(1-x)Ga(x)As and GaSb(1-y)As(y)

18 JUL 1977

Authors: Chin-An Chang; R. Ludeke; L. L. Chang; L. Esaki; IBM THOMAS J WATSON RESEARCH CENTER YORKTOWN HEIGHTS NY

Ceramic Piezoelectric Transducers.

JUL 1977

Authors: L. E. Cross; J. V. Biggers; R. E. Newnham; PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Underpinning the whole effort to prepare new combinations of materials in closely interconnected microstructures is the basic work on ceramic processing. This work can contribute to a better understanding, and thus to better reproducibility of conventional PZT bodies, but its major thrust must be to provide the foundation of electroceramic competence necessary for processing the more sophisticated diphasic systems which are the major hope for significant advance. Significant progress has ...

Diffusion Rate Data and Mass Transport Phenomena for Copper Systems,

JUL 1977

Authors: Daniel B. Butrymowicz; John R. Manning; Michael E. Read; NATIONAL STANDARD REFERENCE DATA SYSTEM

No fully comprehensive treatise on diffusion in copper and copper alloys exists. It is the purpose of this book to serve as the first volume in a two volume reference work on all significant mass transport data in copper and its alloys. It is hoped that the two monographs will be of value and interest to the producers, fabricators, and consumers of copper and its alloys as well as engineers, ...

Evaluation of Sulfosalts

JUN 1977

Authors: Thelma J. Isaacs; R. W. Weinert; J. Murphy; WESTINGHOUSE RESEARCH AND DEVELOPMENT CENTER PITTSBURGH PA

Our studies of phase equilibria in the system T1-V-S show it to be complex. Multiple arrests and supercooling presented problems in determining the maximum melting composition of T13VS4. We have narrowed the area, however, and are now using directional solidification to approach the best composition for reproducible growth. We have completed two parts of our studies on crystal growth parameters, rates of growth, and gradient. During the course of these ...

Viking Software Data.

MAY 1977

278 pages

Authors: Nelson H. Prentiss Jr; MARTIN MARIETTA AEROSPACE DENVER COLO DENVER DIV

This report describes the approach used by Martin Marietta Corporation to develop the Flight, Test and Mission Operations Software Systems that were used to support scientific investigations on the surface of Mars by two Viking Landers in 1976. OVerviews of each of the three software systems are included, together with descriptions of a number of techniques used to develop them. The report stresses problems encountered and their solutions and indicates ...

Photocathode Study to Reduce Noise.

MAY 1977

Authors: W. T. Peria; MINNESOTA UNIV MINNEAPOLIS PHYSICAL ELECTRONICS LAB

Energy loss spectroscopy was used in a study of the Ge(100)- Cs-O system. A characteristic loss at 3 eV was identified and is ascribed to a transition between surface bands. The results are interpreted in terms of a model which requires different overlayer structures (depending upon composition) and a work function minimum at 1 monolayer of Cs and 1/2 monolayer of oxygen. More than 15 years after its discovery, Na2KSb(Cs) ...

The Effect of Frequency, Temperature and Materials Structure on Fatigue Crack Propagation in Polymers

182 pages

Authors: Michael D. Skibo; LEHIGH UNIV BETHLEHEM PA

The effect of cyclic frequency, temperature and internal structure on the fatigue crack propagation (FCP) response of polymers of varied structure and properties was evaluated comprehensively. Crack propagation data in poly(methyl methacrylate) (PMMA), poly(vinyl chloride) (PVC), polystyrene (PS), polycarbonate (PC), and polysulfone (PSF) were obtained as a function of frequency. These results determined over a maximum frequency range of 0.1 to 100 Hz show frequency sensitivity to be a function ...

A Comparison of Various Non-Destructive Inspection Processes Using Hot Isostatically Pressed Powder Turbine Parts.

DEC 1976

173 pages

Authors: Donald E. Nulk; GENERAL ELECTRIC CO LYNN MASS AIRCRAFT ENGINE GROUP

Four emerging NDE (non destructive evaluation) processes were explored using aircraft turbine rotating hardware or simulated samples as test specimens. The material was a high strength nickel-base alloy, Rene' 95, which was made by hot isostatically pressing powder. The bases of comparison were conventional FPI (fluorescent penetrant inspection) and conventional ultrasonic testing. Neutron radiography and radiographic tomography appear to have insufficient capabilities for NDE of this type of turbine hardware. ...

Solid-Vacuum Interfaces.

07 OCT 1976

Authors: t. a. kitchens; OFFICE OF NAVAL RESEARCH LONDON (ENGLAND)

This report briefly recounts the highlights of the Fourth International Symposium on Surface Physics held at the Eindhoven University of Technology on 23-25 June 1976. The emphasis of the meeting was on Solid-Vacuum interfaces. Six invited papers were given, most of which were discussions of recent advances in understanding the analytical techniques used in surface science. (Author)

Surface Crack Growth in Fiber Composites

SEP 76

Authors: J. Im; J. F. Mandell; S. S. Wang; F. J. Mcgarry; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND ENGINEERIN G

The results of an experimental study of damage extension and failure in glass and graphite/epoxy laminates containing partially through-thickness surface cracks are presented. The laminates studied are divided between those containing four plies, 90/0/0/90, l5/-l5/-l5/l5, and 45/-45/-45/45, and those containing 12-16 plies of the general configurations 0/90, + or - 45, and 0/+ or - 60. Most of the results are for surface cracks of various lengths and several depths. ...

Graphite and Ablative Material Response to CO2-Laser, Carbon-Arc, and Xenon-Arc Radiation

SEP 76

38 pages

Authors: william d. brewer; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

This study investigated the behavior of graphite and several charring ablators in a variety of high-radiative heat-flux environments. A commercial- grade graphite and nine state-of-the-art charring ablators were subjected to various radiative environments produced by a CO2 laser and a carbon arc. Graphite was also tested in xenon-arc radiation. Heat-flux levels ranged from 10 to 47 Mw/m2. Tests were conducted in air, nitrogen, helium, and a CO2-N2 mixture which simulated ...

Computer Graphics and Image Processing.

AUG 1976

Authors: Herbert Freeman; NEW YORK UNIV N Y DIV OF APPLIED SCIENCE

This report describes the research performed under the contract during the period 1 June 1969-31 December 1975. The research had as its objective the development of effective computer techniques for analyzing and manipulating line-drawing data with a digital computer. The specific research activities carried out under the contract are summarized in terms of abstracts of technical reports and journal articles.

Surface Ray Methods for Mutual Coupling in Conformal Arrays on Cylindrical and Conical Surfaces.

JUL 1976

Authors: Z. W. Chang; L. B. Felsen; A. Hessel; POLYTECHNIC INST OF NEW YORK FARMINGDALE DEPT OF ELECTRICAL ENGINEERING AND ELECTROPHYSICS

This report describes a stage of development of Surface Ray Methods for mutual coupling in conformal arrays of aperture elements on conducting cylindrical surfaces with a subsequent generalization to conical surfaces. Asymptotic techniques are used to develop expressions for the dyadic Green's function for a circumferential and axial magnetic current sources. These expressions are to lowest order in 1/ka and two orders in 1/kD, where ka is the cylinder circumference ...

European Scientific Notes. Volume 30, Number 5,

31 MAY 1976

Authors: R. H. Nunn; victoria s. hewitson; OFFICE OF NAVAL RESEARCH LONDON (ENGLAND)

Partial Contents: The Presentation of Information to Pilots; Applied and Comparative Psychology at the Univ of Stirling; Burn Infection -- The Birmingham Vaccine Tests; Pattern Recognition -- Fact or Fiction; The UK Gas Turbine Industry; Industrial Robot Symposium; The Personal Name Puzzle; Britain's Miniconference on Laser Damage; CO2 Laser Development at SERL; The Rosenhain Centenary Conference on Physical Metallurgy. Surface Layer Analysis by Means of Ion Beams; Atmospheric Sounding the ...

Solid State Research, 1975:4.

15 MAY 1976

Authors: Alan L. McWhorter; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

This report covers in detail the solid state research work of the Solid State Division at Lincoln Laboratory. The topics covered are Solid State Device Research, Quantum Electronics, Materials Research, Microelectronics, and Surface-Wave Technology. Funding is primarily rpovided by the Air Force, with additional support provided by the Army (BMDATC), ARPA (MSO, IPTO), NSF, and ERDA.

Scanning Electron Microscopy of Fracture Surfaces of Carbon Composite Materials

MAR 76

34 pages

Authors: W. G. Hart; NATIONAL AEROSPACE LAB AMSTERDAM (NETHERLANDS)

A microscopic study has been performed on carbon composite fracture surfaces, using the Scanning Electron Microscope (SEM). It appears that the SEM is a useful tool to examine the fracture surface characteristics of composite materials failing under different loading conditions. (MM)

Paramagnetic Defects in the Surface Region of Processed Silicon,

1976

Authors: Philip J. Caplan; ARMY ELECTRONICS TECHNOLOGY AND DEVICES LAB FORT MONMOUTH N J

Underwater Marine Coatings: A Detailed Examination of Elastomeric Antifouling Materials after Marine Immersion

MAY 1974

Authors: A. De Forest; R. W. Pettis; A. T. Phillip; DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)

Elastomeric antifouling materials based on tributyltin compounds (tributyltin fluoride, tributyltin acetate or bis(tributyltin oxide)) dispersed in natural, polychloroprene or butadiene-acrylonitrile rubber have been examined after marine immersion for periods extending up to two years. Results have been obtained for changes in mechanical properties, release rates of organotin toxics, biological fouling on the surfaces and micrographic structure of the surface. An attempt has been made to relate the performance of these ...

Impact Resistance of Current Design Composite Fan Blades Tested Under Short-Haul Operating Conditions

JUL 73

67 pages

Authors: C. A. Steinhagen; C. T. Salemme; GENERAL ELECTRIC CO EVENDALE OH AIRCRAFT ENGINE GROUP

Boron/epoxy and graphite/epoxy composite blades were impacted in a rotating whirligig facility with conditions closely simulating those which might be experienced by a STOL engine impacted with various foreign objects. The tip speed of the rotating blades was 800 feet per second. The blades were impacted with simulated birds, real birds, ice balls, and gravel. Strain gages, accelerometers, high speed movies, TTUCS (Through Transmission Ultrasonic C- Scan) measurements and sonic ...

Long-Range Ice Outlook Antarctic (1966-67)

NOV 66

18 pages

Authors: Jimmie D. Johnson; Gabriel J. Potocsky; NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS

An outlook of expected sea ice conditions in the Ross Sea and McMurdo Sound regions of Antarctica is presented for the period mid-November 1966 through mid January 1967. Oceanographic and climatic data for these areas were analyzed in terms of sea ice growth during the past austral winter. These analyses, combined with observed ice conditions for the period 3 through 8 October 1966 and a comprehensive study of historical ice ...

Supersonic Cascade Studies. Part 1. Passage Studies

DEC 61

104 pages

Authors: Andrew A. Fejer; George L. Heath; TOLEDO UNIV RESEARCH FOUNDATION OH

An experimental study was made of supersonic flow through various convergent and convergent-divergant passage configurations. The details of the flows were examined by means of total and static pressure surveys and Schlieren photographs and the effects of some changes in passage geometry on the characteristics of the passages were observed. Based on the tests, some design criteria were determined for supersonic passages capable of operating at high static pressure ratios. ...

Evaluation of Arctic Ice-Free Land Sites Kronprins Christian Land and Peary Land, North Greenland, 1960

JUN 61

65 pages

Authors: William E. Davies; Daniel B. Krinsley; AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA

This is a report of terrain investigations conducted in North Greenland, in June and July 1960, for the purpose of locating potential airfield sites. Eight sites were studied; all require a small amount of grading to make a 5000-ft (1500-m) runway. In addition the Broenlund Fjord airfield, site of a test landing on a natural surface in 1957, was re-examined and the the east half of the runway was found ...

Ultrasonic Flaw-Plotting Equipment. A New Development for Ordnance Corps Testing,

08 JUN 1954

Authors: C. H. Hastings; R. W. Buchanan; WATERTOWN ARSENAL MA

Development of Remote, Electronic, X-Ray Image Pickup System.

17 FEB 1953

Authors: DUMONT (ALLEN B) LABS INC PASSAIC NJ

A Comparison of the Experimental Subsonic Pressure Distributions about Several Bodies of Revolution with Pressure Distributions Computed by Means of the Linearized Theory

32 pages

Authors: Clarence W. Matthews; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

An analysis is made of the effects of compressibility on the pressure coefficients about several bodies of revolution by comparing experimentally determined pressure coefficients with corresponding pressure coefficients calculated by the use of the linearized equations of compressible flow. The results show that the theoretical methods predict the subsonic pressure- coefficient changes over the central part of the body but do not predict the pressure-coefficient changes near the nose. Extrapolation ...