Materials Literature
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Alumina films which were anodized in a sulfuric acid solution were studied optically and chemically to verify the presence of unoxidized aluminum in the films. We extracted metallic aluminum from anodic alumina films by using bromine methanol and detected unoxidized aluminum successfully. The volume ratio of unoxidize…
Fixation of the ammonium ion (NH4 +) by clay minerals is an alternate way of building the nitrogen (N) pool in soil to optimize N crop recovery and minimize losses. Clay minerals (illite, montmorillonite, and vermiculite) and an illitic Portnoeuf soil were used to compare NH4 + fixation abilities. Total N determinatio…
The super duplex stainless steel SAF 2507, with a typical composition of ~25%Cr, 3·8%Mo, ~7%Ni, and 0·27%N, has been isothermally heat treated in the temperature range 700–1030°C for times between 1 min and 72 h. The influence of heat treatment on impact toughness and pitting corrosion resistance has been investigated…
The superplastic deformation behavior of fine‐grained, yttria‐stabilized tetragonal zirconia under conditions of biaxial gas‐pressure deformation is described. Sheet specimens were deformed into hemispherical caps at temperatures ranging from 1450° to 1600°C and at imposed gas pressures ranging from 345 to 2760 kPa. F…
XPS spectra were recorded for a poly crystalline CdS sample. For comparison, a surface exposed to air for 1 h (Accession #00115) and a surface prepared by cleaving in situ (Accession #00114) were examined. The record includes Cd 4d, S 2p, Cd 3d, Cd MNN, and valence band spectra.
(Co,Fe) 3 O 4 films were synthesized by the sol–gel method through metalorganic compounds. The (Co,Fe) 3 O 4 films (Co:Fe = 2:1) showed the characteristic behavior of the spinodal decomposition by heat treatments within the miscibility gap. The coercive force of the spinodally decomposed films increased from 0.9 kOe f…
A theoretical expression for the sensitivity of a detection coil for a vibrating sample magnetometer (VSM) is derived. This expression is used to design a detection coil system for a biaxial VSM for measuring the magnetization components in the direction of the applied field (x direction) and perpendicular to the appl…
Deposition of Y2O3 films on Si is of interest due to its use as a heteroepitaxial dielectric material to obtain Si-on-insulator or as an epitaxial buffer layer for the growth of YBa2Cu3Ox, high temperature superconductors on Si. In this investigation, Y2O3 films have been deposited in the downstream location in an ele…
, Peter Landrock, Carl Pomerance, Average Case Error Estimates for the Strong Probable Prime Test, Mathematics of Computation, Vol. 61, No. 203, Special Issue Dedicated to Derrick Henry Lehmer (Jul., 1993), pp. 177-194
No abstract available.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of the two ternary systems water + lithium bromide + lithium iodide and water + lithium chloride + lithium nitrate at various temperaturesShigeki Iyoki, Shozo Iwasaki, Yutaka Kuriyama, and Tadashi UemuraCite this: J. Chem. Eng. Data 1993, 38, 3, 396–398Publicati…
We propose a microscopic expression for a displacement field in a crystal and derive nondissipative equations of motion for the slow hydrodynamic and broken-symmetry modes, including the vacancy-diffusion mode. Comparing these equations with the macroscopic ideal equations of elasticity we obtain exact expressions for…
Abstract Blends of isotactic polypropylene with amorphous and slightly crystalline ethylene‐propylene‐diene terpolymer (EPDM), prepared by solution blending, have been investigated by optical microscopy and differential scanning calorimetry. Nucleation and crystallization kinetic parameters, such as nucleation rates,…
Abstract New photochemically labile phosphate protecting group was developed. These phosphate esters have high molar extinction coefficient (ε340 = 34500 dm3 mol−1 cm−1) and rapidly release parent phosphates upon irradiation ( >300 nm) with high quantum efficiency for disappearance (φdis = 0.22 at 340 nm).
Ultrasonic cleaning is an established method for removing micron-size particles or larger from hard substrates. This paper presents the effect of the ultrasonic frequency and time functions on submicron particle removal effectiveness. The effect of the particle size, concentration and the cleaning liquid temperature i…
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.
Detailed microscopy of two crept aluminas, one with (AD99) and one without (Lucalox) a grain boundary glassy phase, has been performed to determine the pertinent damage mechanisms during creep. Evidence is presented for a nucleation‐controlled cavitation process where creep cavities nucleate primarily on two‐grain fac…
The SMART® Wrist-Hand Orthosis (WHO) is a new method of providing grasping function for quadriplegic patients. The use of shape memory alloy (SMA) actuators in rehabilitation technology (SMART) allows for a new type of actuator in addition to traditional actuators such as Bowden cables, pneumatic cylinders, electric m…
The failure of warp yarns on a loom is often caused by repeated cyclical elongation at small stresses well below the breaking point applied under static load. The phenom enon, commonly known as fatigue, is caused by the gradually diminishing resistance of the material, attributable to cumulative damage. Generally, the…
The equiaxed solidification of eutectic alloys is modelled by a probablistic method. The volume of the specimen is divided into a regular network of cubic cells and the temperature is assumed to be uniform. The temperature of the specimen is calculated in a time-stepping scheme from a simple heat balance and a knowled…