Materials Literature
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TiN bulk and surface energy and hydrogen atom adsorption at three different sites have been studied using density functional theory (DFT) with local and non-local exchange–correlation functionals. Calculations of surface energies confirm the experimental findings that the (100) surface has the lowest and the (111) sur…
Photochromic chiral compounds having two diarylethene units were synthesized in an attempt to use them as dopants for photoresponsive liquid crystals. Stable photoswitching of the photochromic dopants induced large pitch changes of chiral nematic liquid crystals composed of K-15 and a small amount of the chiral dopant…
The first part of this paper describes a combination of physical metallurgical techniques and hydrogen (H 2 ) solubilities employed to help in the characterisation of defects in palladium and its alloys. Cold working or hydride formation and decomposition introduce large dislocation densities into palladium and pallad…
Thermal response and oxidation behavior of commercial metal‐silicon‐infiltrated carbon/carbon composites (MICMAT TM ; Si‐CC) were evaluated in a high‐enthalpy convective environment using an arc jet facility (an arc wind tunnel). Composite specimens were put into a supersonic plasma air stream having a gas enthalpy of…
The nep number in yarn depends on both the nep number in the raw material and changes in the number and size of neps in the spinning process. Therefore, the two problems need to be analyzed separately. The first problem consists of testing the value changes of some cotton parameters on different processing stages, whi…
Poly(ethylene terephthalate) (PET) and poly(ethylene-2,6-naphthalate) PEN oligomers were obtained by degrading high molecular weight PET and PEN. Crystalline PET/PEN blends of varying compositions were prepared by melt blending and then crystallizing at 175°C. Simultaneous solid-state polymerization (SSP) and exchange…
The half-leaky guided-mode technique is used to explore the director profile through a thin, twisted, homogeneously aligned nematic liquid-crystal cell (Merck-E7). Twisted alignment is realized by rubbed polyimide layers on both inner walls of the cell. By monitoring first a particular angle of incidence range of the…
This work reports survey and core level x-ray photoemission spectra obtained from the surface of a barium carbonate powder. The high purity (99.997%) barium carbonate specimen was commercially obtained from Alfa/AESARS. The XPS spectra were acquired with a Kratos Axis 165 instrument using monochromatic Al Kα radiation…
In this research, the electrokinetic behavior and stability of nanosized SiC particles suspended in various electroplating solutions were studied. Analyses were performed using electrophoretic mobility photometry and streaming current (SC) techniques. The electrolytes included NiCl 2 , Ni(SO 3 NH 2 ) 2 , and Na 3 Co(N…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Abstract Many applications now use different materials that are fabricated into structures to obtain the desired combination of properties or to suit particular needs. Ceramics and glasses often are combined with metallic materials for applications in the field of electronics, for insulation and chemical resistance an…
A novel plasma beam source for the deposition of DLC films is described. Wide ranges of ion energy (130-250 eV) and C/sub 2/H/sub 2//N/sub 2/ flow conditions have been used to investigate the effect of N doping an the structure and properties of DLC films. The resulting films are characterized by their chemical compos…
Two series of alicyclic polyimides composed of cis- and trans-dicyclohexyl-3,3′,4,4′-tetracarboxylic dianhydrides (DCDAs) and aromatic diamines were prepared. All cis-polymers could be readily prepared both in a one-step method and a two-step method. However, a two-step method is preferably applied in the preparation…
Highly ordered nanoporous Co membranes were fabricated by a two-step replication from the honeycomb structure of porous anodic alumina. These metal membranes are confirmed to have two substructures: first, the Co membrane consists of very fine quantum-sized particles with diameters of about 2–5 nm; second, the very fi…
This work reports survey and core level x-ray photoemission spectra obtained from the surface of a barium sulfate powder. The high purity (99.998%) barium sulfate specimen was commercially obtained from Alfa/AESARS. The XPS spectra were acquired with a Kratos Axis 165 instrument using monochromatic Al Kα radiation. Th…
Nach Guinier-Simon-Untersuchungen ist Kaliumtrifluormethylsulfonat dimorph, mittels DSC wird eine Umwandlungstemperatur von –33 °C und eine Umwandlungsenthalpie von 0.93 ± 0.03 kJ/mol ermittelt. Im Beugungsexperiment erstreckt sich die Phasenumwandlung in die Tieftemperaturmodifikation über einen Temperaturbereich von…
For the insulation diagnosis of gas-insulated switchgear (GIS), it is necessary to detect partial discharge (PD) under noisy conditions and to specify the direction of electromagnetic wave radiation due to PD. We propose the "phase gate control method" for discriminating the electromagnetic waves caused by PD in SF6 g…
A simple thermomechanical model is applied to evaluate the influence of the nonuniformity of ZnO varistor disks used in surge arresters on their energy-handling capability. Puncture is the dominating failure mode for slightly nonuniform disks, but cracking becomes more likely as the degree of nonuniformities increases…
Young’s modulus and Poisson’s ratio of SiC ceramics at temperatures >1400°C were obtained using a laser ultrasonics method that included a Fabry‐Pérot interferometer (LUFP). At temperatures <1000°C, Young’s modulus and Poisson’s ratio measured using the LUFP method agreed well with those measured using standard…
Amounts of trace elements with large activation cross section in concrete materials were measured to offer the basic data for developing of low activation concrete. From the measurements, the quantities of the activated radioactivities in biological shielding concrete were measured and evaluated for the clearance leve…