Force Fields for Modeling of Ionic Liquids. A force field was developed for the systems 1-Ethyl-1-methylphospholinium Tricyanomethanide and 1-Ethyl-3-methylimidazolium Butanesulfonate using a combination of theoretical calculations and experimental data. The force field parameters simulation results are presented in this final report. In addition, experimental data on related ionic liquid systems is presented and discussed.
Topics: DTIC Archive, Martin,Marcus G, Useful Bias Incorporated Edgewood United States, computational...
A practical camouflage system whose colors and color patterns can be continuously, controllably and reversibly varied on command would be of great tactical importance to mobile army units. In the study described a number of possible approaches were researched, an extensive literature search was carried out, and some laboratory investigations performed. From considerations of each of these approaches, the state-of-the-art in materials technology, and of the requirements of the program, a liquid...
Topics: DTIC Archive, Gilligan, J E, IIT RESEARCH INST CHICAGO IL, *CAMOUFLAGE, *LIQUID CRYSTALS, *COLORS,...
Sharp quantum phase transitions typically require a large system with many particles. Here we show that for a frustrated fully-connected Ising spin network represented by trapped atomic ions, the competition between different spin orders leads to rich phase transitions whose sharpness scales exponentially with the number of spins. This unusual finite-size scaling behavior opens up the possibility of observing sharp quantum phase transitions in a system of just a few trapped ion spins.
Topics: DTIC Archive, Lin,G -D, University of Michigan Ann Arbor United States, PHASE TRANSFORMATIONS,...
Research on 'Grain Boundary Energetics in Non-Oxide Ceramics' has been conducted at CWRU since 1975 and has concentrated on two specific areas--the beta to alpha transformation in polycrystalline SiC, and the nature of grain boundary phases in hot-pressed Si3N4 containing various densification aids. The beta to alpha transformation in polycrystalline SiC is unusual in that it appears to occur in two stages. The first involves the growth of composite plates consisting of alpha-SiC plates...
Topics: DTIC Archive, Heuer,A H, CASE WESTERN RESERVE UNIV CLEVELAND OHIO DEPT OF METALLURGY AND MATERIALS...
A five year program focusing on investigation of attosecond electron dynamics in solid state materials is completed. Two experimental apparatuses for attosecond time-resolved extreme ultraviolet (XUV) studies were constructed. Highlights of results are: a 450 attosecond electronic response time in the conduction band of silicon was experimentally measured by observing steps in the L2,3-edge spectrum of silicon, synchronized with the excitation laser electric field. Independent electron and hole...
Topics: DTIC Archive, CALIFORNIA UNIV REGENTS BERKELEY, *CHARGE CARRIERS, *ELECTRON TRANSPORT, *EXCITATION,...
This study describes the synthesis and molecular mobility of both partially deuterated and fully protonated ethyl polyhedral oligomeric silsesquioxane (POSS) crystals. Phase transitions were identified with differential scanning calorimetry at 258 K and 253 K for partially deuterated and fully protonated ethyl POSS, respectively. A change in entropy of 20. 8 K was observed for both transitions. The crystallographic phase transitions were identified as a high temperature rhombohedral unit cell...
Topics: DTIC Archive, Poliskie, G M, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND...
The acquired computing cluster is used in the development of novel techniques for computational fluid dynamics and continuum mechanics, with a focus on large Eulerian or Lagrangian discretizations. Applications that receive particular emphasis include the following: (1) simulation of discontinuous flows resulting from the interaction of several immiscible or chemically reacting phases; (2) adaptive discretizations of large fluid volumes that can resolve turbulent flows and the effects of highly...
Topics: DTIC Archive, Fedkiw, Ronald, STANFORD UNIV CA DEPT OF COMPUTER SCIENCE, *ALGORITHMS, *COMPUTERIZED...
The structural and chemical properties of the bi-molecular, hydrogen-bonded, nitrogen-rich energetic material triaminoguanidinium 1-methyl-5-nitriminotetrazolate C3H12N12O2 (TAG-MNT) have been investigated at room pressure and under high pressure isothermal compression using powder x-ray diffraction and Raman and infrared spectroscopy. A stiffening of the equation of state and concomitant structural relaxation between 6 and 14 GPa are found to correlate with Raman mode disappearances, frequency...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD SURVIVABILITY-LETHALITY ANALYSIS DIR/...
We have achieved all the goals stated in our grant proposal in collaboration with Dr. C.C. Wu of the University of California at Los Angeles. Specifically, these include: The understanding of the complexity induced nonlinear spatiotemporal structures and the coexisting propagating modes. The development of plasma resonances and coherent structures in space plasmas. The study of fluctuation-induced nonlinear instabilities and their role in the reconfiguration of magnetic topologies in the...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC FIELD CONFIGURATIONS, NONLINEARITY, PLASMA...
The spectra of an ester and a saturated hydrocarbon polymer were obtained at pressures ranging from ambient to 2 GN/sq m (20 kilobar) and at temperatures between ambient and 180 C in absorption and between 150 C and 210 C in emission. To simulate contact conditions the fluids were contained in the tiny sample volume of a diamond cell, i.e., the hole in a metal spacer separating two diamonds pressed against each other in a nut crackerlike arrangement. Pressures could be deduced from bandshifts...
Topics: NASA Technical Reports Server (NTRS), ELASTOHYDRODYNAMICS, INFRARED SPECTROSCOPY, LIQUIDS,...
The following types of experiments for a proposed Space Station Microgravity Particle Research Facility are described: (1) growth of liquid water drop populations; (2) coalescence; (3) drop breakup; (4) breakup of freezing drops; (5) ice nucleation for large aerosols or bacteria; (6) scavenging of gases, for example, SO2 oxidation; (7) phoretic forces, i.e., thermophoresis versus diffusiophoresis; (8) Rayleigh bursting of drops; (9) charge separation due to collisions of rimed and unrimed ice;...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, CHARGED PARTICLES, COALESCING, DROPS (LIQUIDS),...
A potentially powerful technique for separating different biological cell types is based on the partitioning of these cells between the immiscible aqueous phases formed by solution of certain polymers in water. This process is gravity-limited because cells sediment rather than associate with the phase most favored on the basis of cell-phase interactions. In the present contract we have been involved in the synthesis of new polymers both to aid in understanding the partitioning process and to...
Topics: NASA Technical Reports Server (NTRS), CELLS (BIOLOGY), CHEMICAL REACTIONS, DESIGN ANALYSIS,...
This three-year project supported the construction, calibration, and deployment of a new instrument to measure the OH and HO2 radicals on the NASA ER-2 aircraft. The instrument has met and exceeded all of its design goals. The instrumentation represents a true quantum leap in performance over that achieved in previous HO(x) instruments built in our group. Sensitivity for OH was enhanced by over two orders of magnitude as the weight fell from approximately 1500 to less than 200 Kg. Reliability...
Topics: NASA Technical Reports Server (NTRS), AIR SAMPLING, ATMOSPHERIC CHEMISTRY, EFFLUENTS, HIGH...
In this Letter we report Ising model simulations of the growth of alloys which predict quite different behavior near and far from equilibrium. Our simulations reproduce the phenomenon which has been termed 'solute trapping,' where concentrations of solute, which are far in excess of the equilibrium concentrations, are observed in the crystal after rapid crystallization. This phenomenon plays an important role in many processes which involve first order phase changes which take place under...
Topics: NASA Technical Reports Server (NTRS), ISING MODEL, MONTE CARLO METHOD, CRYSTALLIZATION, CRYSTAL...
A model for the phase change behavior of graphite when exposed to a high external radiation heat flux has been developed in order to examine solid-gas nonequilibrium effects. The usual Knudsen-Langmuir type model is extended to one which allows both pressure and temperature discontinuities at the ablating surface. Calculated results indicate a relatively constant effective heat of ablation. However, major uncertainties are shown to remain regarding individual carbon species concentrations and...
Topics: DTIC Archive, Baker,R L, AEROSPACE CORP EL SEGUNDO CA VEHICLE ENGINEERING DIV, *RADIATION,...
Complex networks have been shown to exhibit universal properties, with one of the most consistent patterns being the scale-free degree distribution, but are there regularities obeyed by the r-hop neighborhood in real networks? We answer this question by identifying another power-law pattern that describes the relationship between the fractions of node pairs C(r) within r hops and the hop count r. This scale-free distribution is pervasive and describes a large variety of networks, ranging from...
Topics: DTIC Archive, Papalexakis,Evangelos, CARNEGIE-MELLON UNIV PITTSBURGH PA PITTSBURGH United States,...
The deformation of wet snow is explained in terms of the thermodynamics of the three phases of water. When deformation by particle rearrangement is fully developed, deformation can occur most rapidly by melting at the particle contacts. The rate of deformation is highly sensitive to the liquid water content, ionic impurity content, particle contact area, and stress level. A model of the hydrostatic deformation of wet snow is constructed, and examples of the deformation of wet snow are given for...
Topics: DTIC Archive, Colbeck,Samuel C, COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H,...
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May 22, 2011
05/11
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Katnik, Gregory N.; Bowen, Barry C.; Davis, J. Bradle
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A debris/ice/thermal protection system assessment and integrated photographic analysis was conducted for Shuttle mission STS-70. Debris inspections of the flight elements and launch pad were performed before and after launch. Icing conditions on the External Tank were assessed by the use of computer programs and infrared scanner data during cryogenic loading of the vehicle, followed by on-pad visual inspection. High speed photography of the launch was analyzed to identify ice/debris sources and...
Topics: COPPER OXIDES, SUPERCONDUCTIVITY, YBCO SUPERCONDUCTORS, EXTRACTION, JOSEPHSON JUNCTIONS, PHASE...
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Jul 11, 2010
07/10
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NON
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A binary coded input signal is converted to a binary coded decimal signal having N decades by employing N four bit shift registers. The bits of the input signal are sequentially supplied, in order, to the least significant position of the register for the units decade, with the most significant bit of the input signal being applied to the units register first. Each of the registers includes a right shift-parallel load mode control input terminal. In response to the sum of the values stored in...
Topics: APOLLO SOYUZ TEST PROJECT, PHASE TRANSFORMATIONS, SOLIDIFICATION, SPACE COMMERCIALIZATION,...
The glass transition pressure, Pg, for a polyurethane elastomer (Solithane 113, 50/50 resin-catalyst ratio, manufactured by Thiokol Chemical Co.) is located at 2.5 Kbar at room temperature and the glass transition temperature, Tg, is at -20C. Mechanical behavior of the elastomer, namely the tensile and the compressive stress-strain behavior, in the glassy state as well as in the rubbery state has been determined. The Young's modulus increases from approx. 10 to the 7th power dynes/sq cm in the...
Topics: DTIC Archive, Questad,D L, RUTGERS - THE STATE UNIV PISCATAWAY NJ HIGH PRESSURE MATERIALS RESEARCH...
Numerical analyses based on the finite element method for the prediction of temperatures, thermal strains, and residual stresses due to welding and of the fracture characteristics of weldments are detailed. The obtained results are compared with experimentally obtained data from butt welding 1 in thick HY-130 steel plates using the gas metal arc process. Experimental results on the effects various welding parameters have on the welding distortion of Nickel-Aluminum bronze thin weldments are...
Topics: DTIC Archive, Papazoglou,Vassilios J, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN...
An evaluation of five liquid-fueled pulse detonation engine combustor geometries and flow field conditions was performed over a wide range of equivalence ratios. Particle sizing and spray characterization of commercially available atomizers was conducted to determine the optimum conditions that produced acceptable mass flow and particle size distribution for use in the combustor. The chosen atomizer was installed in the combustor geometries and then analyzed over a range of combustor conditions...
Topics: DTIC Archive, Forster, David L., NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMBUSTORS, *RAMJET...
A hyridopolysilazane-derived ceramic fiber reinforced monoclinic celsian phase barium aluminum silicate glass-ceramic matrix composite material is prepared by ball-milling an aqueous slurry of BAS glass powder and fine monoclinic celsian seeds. The fibers improve the mechanical strength and fracture toughness and with the matrix provide superior dielectric properties.
Topics: NASA Technical Reports Server (NTRS), ALUMINUM SILICATES, BARIUM COMPOUNDS, CERAMIC FIBERS, CERAMIC...
For a large variety of superconducting materials both experimental and theoretical lattice dynamical studies have been performed to date. The assignment of the observed infrared- and Raman-active phonon modes to the particular lattice eigenmodes is generally accepted. We will concentrate here upon the analysis of the changes of the infrared-phonon parameters (frequency and linewidth) upon entering the superconducting state which, as will be shown, may provide information on the magnitude of the...
Topics: NASA Technical Reports Server (NTRS), HIGH TEMPERATURE SUPERCONDUCTORS, INFRARED SPECTRA, PHONONS,...
These tests were part of a large program to evaluate the effects of aerodynamic heating on the Space Shuttle Orbiter. The MA-29 test was a blockage study conducted to determine the maximum allowable model size for OH-90. The OH-90 test was specifically designed to study boundary layer transition on the lower surface of the orbiter wing. Gaps and steps in the wing insulation material were simulated to determine the effect of such irregularities on the state of the boundary layer. The final test...
Topics: DTIC Archive, Stallings, D W, ARO INC ARNOLD AFS TN, *AERODYNAMIC HEATING, *HEAT TRANSFER, *SPACE...
The following report provides a brief outline and description of the steps taken in formulating a simple mathematical model for the analysis of heat transfer in a pure substance undergoing a change in phase (solid to liquid or vice-versa). The problem is approached from the differential point of view and eventually the governing equations are solved by a finite difference technique. The results show fairly conclusively that the present method of analysis is capable of predicting the behavior of...
Topics: DTIC Archive, Nansteel,Mark W, PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB, *HEAT...
Picosecond heating and cooling experiments on silicon surfaces are reported. The surfaces are probed by a picosecond pulse, following the heating pulse, as a function of wave length, time delay and energy fluence. Picosecond laser-induced transformations of modulated metal films extend the glass formation range. New glassy alloys have been formed. Originator-supplied keywords include: Laser-Materials interactions, Picosecond pulses, Phase transitions, and Ultrafast heating and cooling.
Topics: DTIC Archive, Bloembergen,N, HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES, *SURFACE ANALYSIS,...
The effect of heat treatment on precipitation and growth of coherent nanometer-sized Al3(Sc,Zr) particles and the effect of these particles on tensile properties of a direct chill (DC) cast Al-Zn-Mg-Cu-Sc-Zr alloy were studied. The size distribution, average size, number density and volume fraction of the Al3(Sc,Zr) particles were determined as a function of the solution treatment temperature and time. The average particle diameter increased from 6.0 nm to 27.3 nm, the volume fraction increased...
Topics: DTIC Archive, Senkov, O N, UES INC DAYTON OH, *PARTICLES, *PRECIPITATION, *HEAT TREATMENT,...
Optical differential thermal analysis (ODTA) can operate in the 490-3600 C range, using infrared pyrometers for the temperature detection of both the Black-Body and the sample. Hence, the method is called optical. Infrared detection of any phase transition is a result of two cooperative effects: Delta H and the emissivity change. Such cooperation leads to a high sensitivity thereby permitting ODTA measurements at temperature rates as low as 0.1 C/min. Hence, phase transitions can be studied at...
Topics: DTIC Archive, Caslavsky, Jaroslav L, ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB,...
This paper describes a theory for parabolic differential equations for immersed curves on surfaces, which generalizes the curve shortening or flow by mean curvature problem, as well as several models in the theory of phase transitions in two dimensions. The author describes a class of equations for which the initial value problem is well posed for rough initial data, for which one define generalized solutions, i.e. solutions which are smooth, except at a discrete set of times. The methods which...
Topics: DTIC Archive, Angenent, Sigurd, WISCONSIN UNIV-MADISON CENTER FOR MATHEMATICAL SCIENCES, *SURFACES,...
The purpose of this work was to help develop a research roadmap and small proof of concept for addressing key problems and gaps from the perspective of using text analysis methods as a primary tool for detecting when a group is undergoing a phase change. Self-organizing Map (SOM) techniques were used to analyze text data obtained from the world-wide web. Statistical studies indicate that it may be possible to predict phase changes, as well as detect whether or not an example of writing can be...
Topics: DTIC Archive, SANDIA NATIONAL LABS ALBUQUERQUE NM, *TRANSFORMATIONS(MATHEMATICS), *TEXT PROCESSING,...
This report summarizes research on phase transformations induced by the application of high pressure in Ti, Ti-Mo and Ti-V alloys. The relationship of microstructure, studied by TEM and quantitative X-ray diffraction analysis with mechanical properties and superconductive properties was found. The effect of alloying and pressurizing on phase stability correlates with changes in basic physical properties of phases. (Author)
Topics: DTIC Archive, Rabinkin,A, TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF MATERIALS ENGINEERING,...
This report summarizes research on phase transformations induced by the application of high pressure in Ti, Ti-Mo and Ti-V alloys. The relationship of microstructure, studied by TEM and quantitative X-ray diffraction analysis with mechanical properties and superconductive properties was found. The effect of alloying and pressurizing on phase stability correlates with changes in basic physical properties of phases. (Author)
Topics: DTIC Archive, Rabinkin,A, TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF MATERIALS ENGINEERING,...
Commonly, hypotheses introduced by Cauchy or Born are used to relate macroscopic deformation to atomic motions, in molecular theories of elasticity. Our purpose is to discuss the applicability of these to crystal-crystal phase transformations and the ambiguities which are involved in estimating the deformation from observations of lattice vectors. (Author)
Topics: DTIC Archive, Ericksen,J L, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *Applied...
The scientific objective is to study the relation between the morphology and the growth kinetics of domains during phase separation. We know from previous experiments performed near the critical point of pure fluids and binary liquids that there are two simple growth laws at late times. The 'fast' growth appears when the volumes of the phases are nearly equal and the droplet pattern is interconnected. In this case the size of the droplets grows linearly in time. The 'slow' growth appears when...
Topics: NASA Technical Reports Server (NTRS), CRITICAL POINT, SUPERCRITICAL FLUIDS, BINARY FLUIDS, PHASE...
The scientific objective of this research is to increase the fundamental knowledge base for liquid- phase processing of technologically important oxide materials. The experimental objective is to define conditions and hardware requirements for microgravity flight experiments to test and expand the experimental hypotheses that: 1. Liquid phase transitions can occur in undercooled melts by a diffusionless process. 2. Onset of the liquid phase transition is accompanied by a large change in the...
Topics: NASA Technical Reports Server (NTRS), MICROGRAVITY, LIQUID PHASES, ALUMINUM OXIDES, YTTRIUM OXIDES,...
The NASA Marshall Space Flight Center Microgravity Science Program is dedicated to promoting our understanding of materials processing by conducting relevant experiments in the microgravity environment and supporting related modeling efforts with the intent of improving ground-based practices. Currently funded investigations include research on dopant distribution and defect formation in semiconductors, microstructural development and transitions in dendritic casting alloys, coarsening...
Topics: NASA Technical Reports Server (NTRS), MICROGRAVITY, SEMICONDUCTORS (MATERIALS), MATERIALS SCIENCE,...
Condensation of nitrogen flow in an expanding nozzle flow is analyzed using one-dimensional gas dynamic equations and the equations for nucleation and droplet growth. Effects of variations in the Tolman constant and the mass accommodation factor are discussed as well as the effect of foreign nuclei. Comparisons are made with experimental data obtained from a small, contoured nozzle.
Topics: NASA Technical Reports Server (NTRS), CONDENSING, NITROGEN, NOZZLE FLOW, GAS ANALYSIS, GAS...
Progress in the development of low-cost solar arrays is reported. Topics covered include: (1) development of a simplified feed system for the Na used in the Na-SiF4 reactor; (2) production of high purity silicon through the reduction of sodium fluosilicate with sodium metal; (3) the leaching process for recovering silicon from the reaction products of the SiF4-Na reaction; and (4) silicon separation by the melting of the reaction product.
Topics: NASA Technical Reports Server (NTRS), ELECTROCHEMISTRY, PHASE TRANSFORMATIONS, SILICON, SOLAR...
The temperature of the interface and/or a superficial layer of a substrate during ion plating was investigated using a metallic glass of the composition Fe67Co18B14Si1 as the substrate and as the temperature sensor. Transmission electron microscopy and diffraction studies determined the microstructure of the ion-plated gold film and the substrate. Results indicate that crystallization occurs not only in the film, but also in the substrate. The grain size of crystals formed during ion plating...
Topics: NASA Technical Reports Server (NTRS), ION PLATING, METALLIC GLASSES, SUBSTRATES, SURFACE...
Silicon carbide has strong potential for heat engine hardware and other high-temperature applications because of its low density, good strength, high oxidation resistance, and good high-temperature creep resistance. Hot isostatic pressing (HIP) was used for producing alpha and beta silicon carbide (SiC) bodies with near-theoretical density, ultrafine grain size, and high strength at processing temperatures of 1900 to 2000 C. The HIPed materials exhibited ultrafine grain size. Furthermore, no...
Topics: NASA Technical Reports Server (NTRS), FRACTURE STRENGTH, HOT ISOSTATIC PRESSING, MICROSTRUCTURE,...
An energy harvesting device for harvesting energy from a moving structure includes a housing allowing transmission of magnetic fields therethrough. A piezoelectric material capable of a phase transition and a magnetostrictive material capable of a structural change when subjected to a magnetic field are mechanically coupled to each other in the housing. An adjustable pre-stress means is positioned between the housing and the combination of the piezoelectric and magnetostrictive materials....
Topics: DTIC Archive, NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI, *ELECTROMECHANICAL DEVICES, *ENERGY...
Experimental and theoretical studies have been carried out relevant to the structural, lattice electronic, magnetic and superconducting properties of synthetic metals prepared by intercalating graphite. New synthesis methods have been developed for preparing magnetic transition metal chloride and potassium-hydrogen graphite interaction compounds. The use of ion implantation to enhance intercalation has been explored and promising results have been obtained. Structural studies using high...
Topics: DTIC Archive, Dresselhaus,M S, MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR MATERIALS SCIENCE...
An 11at.%Cr-lat%Mo commercial steel which contain C, Si, Mn, Nb and V as minor elements was investigated by atom-probe (AP) and transmission electron microscopy (TEM). This steel has an excellent heat resisting property at 600 - 650 C but undergoes the ductile - brittle transition in this temperature range. The following results were obtained: 1) After solution treatment the FIM image was homogenous on an atomic scale. 2) After tempering at 650 C for 1 hr a precipitate was detected. AP analysis...
Topics: DTIC Archive, Igata,N, PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND...
Recent years have seen exciting new developments in mathematics and computer science, which have opened up new domains of application for computational mathematics. These come with new challenges, for which new approaches and tools must be and are being developed. Machine learning and compressive sensing are two typical examples; they draw not only from traditional linear algebra based numerical analysis or approximation theory, but also from information theory, graph theory, the geometry of...
Topics: DTIC Archive, Singer,Amit, Princeton University Princeton United States, INFORMATION THEORY,...
Crystals of the ethyl substituted octa-silsesquioxane (C2H5SiO1.5)8 (ethyl POSS) undergo two phase transitions within the temperature range from 300K to 100K. At room temperature, crystalline ethyl POSS exhibits a plastic phase (phase I). When the temperature drops below about 255K, the molecular motion in the crystal slows to a rigid limit. This transition from phase I to phase II lowers the symmetry from rhombohedral to triclinic, corresponding to the change from one sixth of a molecule per...
Topics: DTIC Archive, Mueller, Peter, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY, *PHASE...
This Phase I SBIR project has investigated a lightweight packaging design for phase change materials (PCMs) used in thermal management. To control expansion stress, conventional PCM heat sinks have strong encapsulation that weighs more than the PCM they contain. The objective of this work is to develop PCM heat sinks configured as thin sandwich plates, in which the mass of the encapsulation is a small fraction of the PCM mass. The design is based on a lightweight carbon fiber core that has...
Topics: DTIC Archive, Knowles, Timothy R., ENERGY SCIENCE LABS INC SAN DIEGO CA, *FIBER REINFORCED...
This conference was held from 29 July to 2 August, 1991, at the Holderness School in Plymouth, New Hampshire. The topics discussed included: how to achieve super-responses in ceramic materials by engineering of structural instabilities, spin-glass models of relaxor ferroelectrics, engineering of super-tough ceramics in zirconias, smart materials and structures, engineering and modelling of ferroelectrics for high strain actuators, small particle size effects in ferroelectrics, ferroelectric...
Topics: DTIC Archive, Cruickshank, Alexander A, GORDON RESEARCH CONFERENCES INC KINGSTON RI, *OPTICAL...
Main topics include (1) Gigantic magnetoresistance in magnetic multilayers, (2) Properties of ultra-thin magnetic films, (3) Infra-red properties of magnetic materials and doped semiconductors, (4) Phase transitions and the tailoring of magnetic properties in magnetic multilayers.
Topics: DTIC Archive, Camley, R E, COLORADO UNIV AT COLORADO SPRINGS, *MAGNETIC PROPERTIES, STRUCTURES,...
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May 23, 2011
05/11
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Lanford, Pamela J.; Popper, Arthur N
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Using transmission electron microscopy, we have identified a new type of afferent terminal structure in the crista ampullaris of the goldfish Carassius auratus. In addition to the bouton-type afferent terminals previously described in the ear of this species, the crista also contained enlarged afferent terminals that enveloped a portion of the basolateral hair cell membrane. The hair cell membrane was evaginated and protruded into the afferent terminal in a glove-and-finger configuration. The...
Topics: ISING MODEL, PHASE TRANSFORMATIONS, SOLUTES, TRAPPING, DIFFUSION COEFFICIENT, TWO DIMENSIONAL...
