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Oct 6, 2015
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Menon, Sarath Kumar.;Fox, Alan G.
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Cover title
Topic: PHASE STUDIES.,TITANIUM ALUMINIDE.,BINARY ALLOYS.
Cover title
Topics: PHASE STUDIES., TITANIUM ALUMINIDE., BINARY ALLOYS.
Topics: DTIC Archive, Nordio, Amina, PICATINNY ARSENAL DOVER NJ, *LIQUIDS, *SOLIDIFICATION, *ORDNANCE,...
Topics: DTIC Archive, DECIUS, J.C., OREGON STATE UNIV CORVALLIS, *MOLECULAR SPECTROSCOPY, MICROPHONES,...
Current research in the marcy-body problem, field theory, and particle physics is discussed.
Topics: DTIC Archive, BRUSSELS UNIV (BELGIUM), *N BODY PROBLEM, FIELD THEORY, PHASE STUDIES, QUANTUM...
Topics: DTIC Archive, LYUBOV, B. YA., COLUMBIA UNIV NEW YORK, *THERMOPHYSICAL PROPERTIES, CRYSTALLIZATION,...
Consideration is given to multi- or single-phase chemical equilibrium problems, showing that, under certain circumstances, a problem involving a very large number of different chemical species may be replaced by one involving relatively few species. The new problem will then be much more amenable to numerical solution than the original problem.
Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *CHEMICAL EQUILIBRIUM, MATHEMATICAL ANALYSIS, VECTOR...
Research on materials and electro-optic response measurements of certain cholestericnematic mixtures was performed in an effort to develop an optical storage display. Mixture of selected compounds from the series, p- alkoxybenzylidene-p'-aminophenyl acylates, were prepared and one ternary mixture (NH-1) which exhibited nematic behavior from 25 to 105C was found. A group of optically active benzylidene aniline derivatives having alkoxy and acyloxy groups with asymmetric carbon atoms was...
Topics: DTIC Archive, Castellano, Joseph A, RCA LABS PRINCETON NJ, *PHASE STUDIES, *IMINES,...
With the long-working-distance phase-contrast condensers now available, it is possible to use plastic T-30 tissue culture flasks in phase- contrast time-lapse cinephotomicrographic studies. Data and photographs obtained with such a system are presented, and the advantages of using plastic flasks are discussed.
Topics: DTIC Archive, Schneider, Louis E, FORT DETRICK FREDERICK MD, *TISSUE CULTURE CELLS,...
This report deals with accurate determinations of basic properties of phases in systems of transition metals and non-metals. These studies are mainly confined to the borides, silicides and phosphides of transition metals from Groups VI, VII and VIII. Comprehensive and detailed reviews of the binary transition metal borides, silicides and phosphides have been given in Technical Notes No. 13 and 34. The present report is therefore confined to general aspects only, which are presented in two main...
Topics: DTIC Archive, Hagg, Gunnar, UPPSALA UNIV (SWEDEN), *PHASE TRANSFORMATIONS, *PHOSPHIDES, *BORIDES,...
Determinations are given for diagrams of p - x - mixtures of helium- nitrogen under pressure of 5 to 150 atm and at temperatures of 64, 78, 90 and 108K and diagrams of T-x at 4 and 20 atm. Calculations are given for i- xdiagrams for pressures of 4 and 20 atm on the basis of T-x-diagrams. The purpose of the study was to solve the problem of obtaining pure helium from natural gases with the least possible losses of helium.
Topics: DTIC Archive, REDSTONE SCIENTIFIC INFORMATION CENTER REDSTONE ARSENAL AL, *NITROGEN, *HELIUM, PHASE...
Bulk Sm Co/ Fe nanocomposite magnets were fabricated by high energy ball milling and subsequent quick hot-pressing. Three different parameters were investigated which are soft phase content, type, and distribution. The effect of Fe soft phase content on the magnetic properties of the final bulk samples was examined. Increasing the Fe content significantly increased the saturation magnetization but at the cost of reduced coercivity. The optimum Fe addition for the highest maximum energy product...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AEROSPACE SYSTEMS DIR, *MAGNETIC...
A review is given of elementary thermodynamic theory of phase equilibrium and phase transitions. The topics covered include phase transitions of the 1st and 2nd order, properties of the critical point, and the Clausius Clapeyron equation.
Topics: DTIC Archive, Ciobanu, Eleonora, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *THERMODYNAMICS,...
To compensate for sparse coverage of the AI events by the SRO/ASRO and SDCS networks, the depth determination program has been modified to process seismic array data. This will substantially increase the proportion of AI events that can be processed. A total of 28 events were examined during this quarter; 14 of these could not be processed due to inadequate data. Of the remaining 14 events, depth estimates were obtained on 6 of them, 4 were found to be outside the 10-80 km depth range examined,...
Topics: DTIC Archive, Page, Edward, ENSCO INC SPRINGFIELD VA, *SEISMIC DETECTION, ALGORITHMS, DEPTH,...
Oriented eutectic microstructures have been produced in the system Al2O3/ZrO2 using a Bridgman-type crystal-growing furnace. Ingots consisted of elongated columnar grains or colonies. Inside the colonies a rod-type eutectic microstructure consisting of rods of ZrO2 surrounded by an Al2O3 matrix was observed. The eutectic point was re-established at 63 mo1% Al2O3/37.0 mo1% ZrO2 and 1870C. Al203 is the first phase to nucleate when eutectic growth occurs.
Topics: DTIC Archive, Schmid, Frederick, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA,...
Topics: DTIC Archive, ROEDDER, EDWIN, UTAH UNIV SALT LAKE CITY, *ALUMINUM COMPOUNDS, POTASSIUM COMPOUNDS,...
The research project concluded has had the aim of studying the miscibility and phase transition behavior of polymer blends and, in particular, those blends containing block copolymers, by utilizing the techniques of light scattering and small angle x ray scattering.
Topics: DTIC Archive, Roe, R J, CINCINNATI UNIV OH, *BLOCK COPOLYMERS, *POLYMERS, *PHASE TRANSFORMATIONS,...
A simple technique has been developed to measure the transparency of materials at any specific wavelength (ultraviolet to near infrared) versus temperature. The procedure involves heating a sample between calcium fluoride plates in a brass holder placed in a Cary-14 spectrophotometer. Changes in transmittance at a fixed wavelength are recorded continuously as the temperature is allowed to change slowly. As an illustration of the procedure, the transmission properties of the nematic liquid...
Topics: DTIC Archive, Novak, Thaddeus J, EDGEWOOD ARSENAL ABERDEEN PROVING GROUND MD, *ABSORPTION,...
A composite model for plastic deformation of semi-crystalline polymers is used to simulate deformation textures evolution in these two-phase materials. Three types of textures are simulated: crystallographic texture, morphological texture, and molecular alignment within the amorphous domains. Predictions of these textures in deformed high density polyethylene (HDPE) are shown for a uniaxial tension test.
Topics: DTIC Archive, Ahzi, S, MASSACHUSETTS INST OF TECH CAMBRIDGE, *SYMPOSIA, MORPHOLOGY, POLYETHYLENE,...
The thermodynamic fundamentals relating phase equilibria in binary and ternary systems to the thermodynamic properties of the phases are reviewed and discussed. Considered in detail are partition equilibria in ternary systems and the role of the three-phase equilibrium in the determination of the relative stabilities of stable as well as hypothetical phases. Sample calculations carried out on selected ternary metal-carbon and a metal silicate system demonstrate the application of the equations...
Topics: DTIC Archive, Rudy, Erwin, AEROJET-GENERAL CORP SACRAMENTO CA MATERIALS RESEARCH LAB,...
The Cowley theory is used to estimate the effect of nonstoichiometry on long-range order in beta-CuZn alloys.
Topics: DTIC Archive, Walker, Christopher B, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA,...
This report is the result of investigations of phase equilibria in the binary systems, zirconium-carbon, tantalum-carbon, and boron-carbon. A completed phase diagram which encompasses experimental results and considerations heretofore unreported in the literature, is presented for the zirconium-carbon system. A tentative phase diagram for the tantalum-carbon system is included, which, in general, resembles the version released by Ellinger in 1943. Preliminary results for the boron-carbon...
Topics: DTIC Archive, Sara, R V, UNION CARBIDE CORP PARMA OH, *CARBIDES, *PHASE STUDIES, MICROSTRUCTURE,...
We present in this report the phase of a wave front as described by the Zernike polynomials and the corresponding intensities in the focal plane. (Author)
Topics: DTIC Archive, Herrmann,Jan, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *FOCUSING,...
All planned program development work on the Seismic Data Analysis Center (SDAC) version of the source depth determination program has been completed. In addition, the program has been modified to process seismograms from the Area of Interest (AI) data set. One event, AI Event No. 1 (7/26/77), was run as a test, and a depth estimate of 21 km was obtained.
Topics: DTIC Archive, Page, Edward A, ENSCO INC SPRINGFIELD VA, *SEISMIC DETECTION, ALGORITHMS, DEPTH,...
Studies of a copolyester of 20% hydroxybenzoic acid, 40% isophthalic acid and 40% hydroquinone, a mesomorphic polymer, were carried out under pressure. The phase behavior was characterized by the x-ray diffraction, thermal analysis and high pressure DTA techniques. It was found that pressure induced a new crystal habit in the solid and a new mesophase in this polymer. All thermal transitions have been summarized in a proposed phase diagram. The finding of pressure induced mesomorphism confirms...
Topics: DTIC Archive, Hsiao,B S, CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE, *PHASE STUDIES,...
A new series of nematic liquid crystals based on p-alkylcarbonato-p'- alkoxyphenyl benzoates was prepared. Binary and ternary mixtures of selected derivatives taken from this series exhibited nematic behavior at or near room temperature. These materials were found to exhibit a highly efficient scattering system with a gated ac signal at 120 V. A study of the orientation pattern of domain formation and the generation of disclination loops was undertaken in an effort to further elucidate the...
Topics: DTIC Archive, Castellano, Joseph A, RCA LABS PRINCETON NJ, *CRYSTALS, *DISPLAY SYSTEMS,...
Topics: DTIC Archive, KESSLER, HAROLD D., ROSTOKER, WILLIAM, VAN THYNE, ROBERT J., IIT RESEARCH INST...
A study is made of the attenuation of acoustic waves by a suspension of fluid droplets in a fluid medium. Special attention is given to the case of small droplets for which the effect of the surface tension is not negligible. The droplets are allowed to execute large translational motion and to undergo a small deformation from a spherical shape. It is shown that the result of Epstein and Carhart on the attenuation of sound waves in a gas with the suspension of liquid droplets is applicable even...
Topics: DTIC Archive, BROWN UNIV PROVIDENCE RI, *AEROSOLS, *BUBBLES, *SOUND, HEAT TRANSFER, PHASE STUDIES,...
The following problem which is of possible biological, chemical and physical interest is investigated. A particle existing at time t sub 1 = 0 is assumed to have probabilities q sub n or =0, of being transformed into n similar particles at some random time t 0. Assume that a start is made with a single particle at t = 0. Under the hypothesis that any particle has a life- length probability distribution independent of its time of birth and of the number of other particles existing at this time,...
Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *STOCHASTIC PROCESSES, *TRANSFORMATIONS, INTEGRAL...
A homologous series of S-cholesteryl alkanethioates was prepared by reaction of 3beta-mercaptocholest-5-ene with the imidazolides of alkanoic acids. The mesomorphic properties of 20 members, S-cholesteryl thioformate through eicosanethioate were determined. All alkanethioates are monotropic cholesteric except the cholesteryl thioformate. Cholesteryl thioheptanoate and all higher homologues in this series also exhibit a monotropic smectic mesophase. A comparison with the corresponding...
Topics: DTIC Archive, Elser, Wolfgang, ARMY NIGHT VISION LAB FORT BELVOIR VA, *CHOLESTERYL ESTERS, *PHASE...
Phase diagrams of the systems CH2BrCl-CO2, CBr2F-CO2, and CBr2F-CO2 were constructed and found to exhibit single eutecties at the low CO2 content side of the diagrams. The apparatus used to prepare mixtures of known oomposition is described, as well as tbe method of cooling which permits visual identification of the freezing points at very low temperature.
Topics: DTIC Archive, VANDERKOOI, WILLIAM N., DEVRIES, T., AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB...
The theoretical problems involved in nucleation are being re-examined further. Theoretical computation of cluster energy using a simple molecular- pair model is being explored. The problem is to predict the thermodynamic equilibrium concentration of such clusters. This equilibrium concentration of a certain-sized cluster is related to the free energy of the cluster. The free energy of the cluster in turn involves its translation and rotation energies and also the vibration energy of the...
Topics: DTIC Archive, THIOKOL CHEMICAL CORP DENVILLE NJ REACTION MOTORS DIV, *CONDENSATION, *VAPORS,...
In many array radars the composite beam is di rected by quantized phase shifters. Regular sequence of quantization errors enhances side lobes and pointing errors. It is recommended to break up the regularity by small, known nonlinear and preferably quasi-random initial phase devia tions in the array elements. This reduces the lobes and pointing errors for a given number of quantization steps, especially in high gain, multi-element arrays.
Topics: DTIC Archive, Albersheim, W J, MITRE CORP BEDFORD MA, *RADAR ANTENNAS, *ANTENNA LOBES, PHASE...
Topics: DTIC Archive, HORNE, G. T., CARNEGIE INST OF TECH PITTSBURGH PA METALS RESEARCH LAB, *DIFFUSION,...
Polysiloxanes and copolysiloxanes containing the trans 5-(n-undecanyl)-2-(4-cyanophenyl)-1,3-dioxane side group as mesogen were synthesized. Their phase behavior was studied by differential scanning calorimetry and optical polarization microscopy. Homopolymers containing the mesogen and a copolymer containing 33% of the mesogen showed smectic mesomorphism. The copolymers containing the mesogen showed two well defined Tg and thus present strong evidence for a phase separated morphology.
Topics: DTIC Archive, Hsu,Chain S, CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE,...
Topics: DTIC Archive, Savitskiy, YE M, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *CERIUM ALLOYS,...
Large crystals of LaAlO3 were successfully grown from a straight PbF2 flux. However, soak temperatures above 1400C are required for solution of LaF3 formed by the reaction of La2O3 and PbF2. These high temperatures result in premature failure of the furnace and platinum container. PbF2 was, therefore, abondoned and a search was initiated to modify the PbF2 flux, or to find a more suitable solvent. Among the solvents investigated were PbO-PbF2, BaO and Bi2O3, all with small additions of B2O3....
Topics: DTIC Archive, LITTON SYSTEMS INC MORRIS PLAINS NJ AIRTRON DIV, *CRYSTAL GROWTH, ALUMINATES, CERAMIC...
The beta phase of high purity samples of tetramethylsilane (TMS), (CH3)4Si, was investigated between 77K and its melting point (174K) employing static and rotating frame proton spin-lattice relaxation measurements. Activation energies and inverse frequency factors for both motions are derived and discussed. It is suggested that the presence of exponential proton magnitization decays in solids containing methyl groups may sometimes serve as an indication for the presence of reorientations of the...
Topics: DTIC Archive, Albert, Shmuel, ILLINOIS UNIV AT URBANA WILLIAM A NOYES LAB, *NUCLEAR MAGNETIC...
Topics: DTIC Archive, EDWARDS, RUSSELL K., ILLINOIS INST OF TECH CHICAGO, *THERMODYNAMICS, *COPPER, *GOLD,...
The crystal structure of Ta2VC2 was determined from X-ray powder photographs. The phase is stable from room temperature to above 2600C. The homogeneity range of 1650C varies between the limits (Ta1.80 to 2.04, V1.20 to 0.96)C1.74 to 1.80; the phase is thus substantially deficient in carbon.
Topics: DTIC Archive, Rudy, Erwin, AEROJET-GENERAL CORP SACRAMENTO CA MATERIALS RESEARCH LAB, *CARBIDES,...
A combined experimental and theoretical investigation of the radiation-induced impulse and stress generation characteristics of aluminum has been carried out for cases where a significant portion of the blowoff material was in the liquid-vapor state. Intense pulsed electron beams were used as a source of rapid (50 nsec) high-energy-density loading to produce mixed-phase effects in aluminum. Impulse measurements were obtained with a ballistic pendulum for peak doses of up to 3800 cal/gm....
Topics: DTIC Archive, PHYSICS INTERNATIONAL CO SAN LEANDRO CA, *ALUMINUM, *EQUATIONS OF STATE,...
The influence of molecular construction of LC dendrimers on their phase behavior and properties have been studied. First to five generations of carbosilane LC dendrimers with 8, 16, 32, 64 and 128 terminal mesogenic groups (cyanobiphenyl, methoxyphenyl benzoate, ethyl lactate derivatives, etc.) have been synthesized. Investigation of thermal behavior and structure of LC dendrimers reveals smectic mesophases over a wide temperature region. LC dendrimers with terminal ethyl-L-lactate-containing...
Topics: DTIC Archive, Shibaev, V P, MOSCOW STATE UNIV (USSR) DEPT OF CHEMISTRY, *LIQUID CRYSTALS,...
Viewgraphs of presentation on refractory metal and silicide multiphase systems for high-temperature structural applications.
Topics: DTIC Archive, Mendiratta, M G, UES INC DAYTON OH, *MECHANICAL PROPERTIES, *REFRACTORY METALS,...
Isenthalpic solidification of a pure supercooled liquid is shown to result in either a two-phase solid/liquid mixture in invariant equilibrium or a single-phase, totally solid material in univariant equilibrium, depending on the level of supercooling prior to solidification. The critical supercooling above which univariant equilibrium is obtained is large for metals (hundreds of centigrade degrees) but much smaller for certain molecular substances. Experiments on white phosphorus (alpha P4)...
Topics: DTIC Archive, Glicksman, M E, NAVAL RESEARCH LAB WASHINGTON DC, *PHASE STUDIES, CRYSTAL DEFECTS,...
Topics: DTIC Archive, WARF, JAMES C., UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES, *RARE EARTH COMPOUNDS,...
The behavior of vapors in bearings should be quite different from that of gases. Thermodynamic processes are treated simply in gas-lubricated bearings, but they are likely to both be more complex and more important in vapor-lubricated bearings. Under most practical operating conditions, condensation can be expected to occur in vapor-lubricated bearings. Consequently, the vapor-lubricated bearing problem is one of two-phase flow. An analytical study of two-phase flow in thrust bearings is being...
Topics: DTIC Archive, ORCUTT, F K, MECHANICAL TECHNOLOGY INC LATHAM NY, *GAS BEARINGS, *PHASE STUDIES,...
Implementation of the seismic source depth analysis package at SDAC has been completed. This version includes Calcomp plot output of seismograms, cepstrums, and depth plots, and allows the analyst to easily reprocess an event using different combinations of input data and analysis parameters. Three new processing features have been developed: phase editing, an improved significance level algorithm, and computation of a depth threshold based on data bandwidth. Phase editing permits...
Topics: DTIC Archive, Page, Edward, ENSCO INC SPRINGFIELD VA, *SEISMIC DETECTION, CEPSTRUM TECHNIQUE,...
This report details the results of a special session on regional phase blockage which was held during the Seismological Society of America's 91st Annual Meeting in St. Louis, Missouri on April 2, 1996. The session consisted of seven orally presented papers by members of the seismic monitoring research community and a follow-up meeting that was intended to be a discussion session about the scientific problem of phase blockage. The report contains the abstracts from the talks, background on...
Topics: DTIC Archive, Reiter, Delaine T., PHILLIPS LAB HANSCOM AFB MA, *MONITORING, *SEISMIC WAVES,...
Topics: DTIC Archive, AMUNDSON, NEAL R., STUSIAK, MICHAEL, MINNESOTA UNIV MINNEAPOLIS INST OF TECH,...
The measurements were made on solid He4 in the region of the gamma (body-centered cubic) phase discovered by Vignos and Fairbank. Points were taken at constant temperature for six temperatures between 1.45K and 1.73K. The results for pressures near the melting and transition curves are shown. The lower density gamma phase is clearly seen as the first step in the curve. The measured volume changes for melting and for the solid transition are listed. The volume changes for melting agree with...
Topics: DTIC Archive, YALE UNIV NEW HAVEN CT, *CRYOGENICS, *HELIUM, *SOLIDIFIED GASES, TEST METHODS, PHASE...
