Materials Literature
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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…
2-methyl benzoazole and 2-mercapto benzoazole derivatives were investigated as corrosion inhibitors for Type 304 (UNS S30400) stainless steel in 2 M sulfuric acid (H2SO4) solution using weight loss, gasometry, and alternating current (AC) impedance techniques. Effect of immersion time and temperature were studied. The…
We have studied the relative rates of oxidative corrosion of U–Nb alloys containing 2–8 wt. % Nb, using x-ray photoelectron spectroscopy and depth profiling by sputtered neutrals mass spectroscopy. The alloys have been characterized after exposure to dry and humidified air (up to 50% relative humidity) at temperatures…
We characterize the local Li structure in the low-temperature phase of LixC60 with 6⩽x⩽15 using single and multiple-quantum Li7 nuclear magnetic resonance spectroscopy. We find clear evidence for Li cluster intercalated structures in all compositions. The inferred cluster sizes are significantly smaller than those sug…
XPS spectra are reported for a well-ordered Ni2P (0001) surface. These are the first reported photoemission spectra for this transition metal phosphide in single crystal form. Ion bombardment and annealing produces an ordered surface.
Abstract Rietveld refinement and the final model for pure κ -alumina are presented. The starting model was obtained through total energy calculations based on first principles. The resulting geometry parameters are within intervals of expected values for octahedral and tetrahedral coordina-tions. This result thus serv…
Abstract Measurements of the contact angle for water, glycerol, formamide, ethylene glycol, and diiodomethane on polymethyl methacrylate covered by adsorptive bovine serum albumin (BSA) films were made. Adsorption was performed from solutions in the concentration range 0–100 g/L. From the obtained contact angles the L…
Abstract In‐depth imaging of subsurface structures in scanning electron microscopy (SEM) is usually obtained by detecting backscattered electrons (BSE). For a layer‐by‐layer imaging in BSE microtomography, it is preferable to use an energy filtering of BSE. A simple approach is used to estimate the contrast by using b…