Materials Literature
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SrO‐doped CeO 2 electrolyte has been evaluated in single‐cell configuration under solid‐oxide fuel cell operating conditions. Because of oxygen loss from the crystal lattice, the material experiences a macroscopic expansion of several percent at 1000°C. On extended cell operation, strontium precipitates‐out at/near th…
This work reports survey and core level x-ray photoemission spectra obtained from the surface of a barium nitrate powder. The high purity (99.999%) barium nitrate specimen was commercially obtained from Alfa/AESARS. The XPS spectra were measured with a Kratos Axis 165 instrument using monochromatic Al Kα radiation. Th…
Symmetry analysis is carried out for the ordered phases of cubic monoxide TiO y with relative oxygen contents y <1 and y >1. It is established that a partially ordered orthorhombic phase (space group Immm )—a derivative of the orthorhombic M 3 X 2 □ superstructure (at y <1.0) or the inverse superstructure M 2 ■X 3 (at…
We present the results of an investigation of the magnetic properties of A/sub 2/FeReOe (A=Ca, Sr, Ba). We have studied the magnetization, high-temperature susceptibility and the ferromagnetic resonance response. The Ba and Sr systems are conducting while the Ca material is an insulator. The ordering temperature of th…
Cure characteristics and mechanical properties of short nylon fiber reinforced natural rubber composites have been studied. Minimum torque, (maximum-minimum) torque and cure rate increased with fiber concentration. Scorch time and cure time decreased by the addition of fibers. Properties such as tensile strength, tear…
Abstract Micrograin superplasticity refers to the ability of fine‐grained materials ( d <10µm, where d is the grain size) to exhibit extensive neck‐free elongations during deformation at elevated temperatures ( T >0.5 T m , where T m is the melting point). Consideration of recent experimental data regarding the…
XPS spectra of lithium manganese oxide (LiMn2O4) are presented. The spectra were collected using monochomated Al Kα x-rays. Spectra include survey scan, the Li 1s region, the Mn 2p, 3p, and 3s regions, the O 1s region, and the Mn LMM Auger transitions.
The role of the excitation of guided waves propagating in a corrugated dielectric waveguide is discussed in view of the resonance anomalies in reflectivity. Narrow-wavelength filtering properties that are due to these sharp anomalies have been a topic of interest for some time, but a proper understanding of device per…
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…