Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
An investigation of the stress-strain response as a function of strain rate, spall strength, and dynamic fracture behavior of pure W, W-26Re, W-Ni-Fe and W-Ni-Fe-Co has been performed. Spall strength measurements, obtained in symmetric-impact tests, showed an increase in spall strength from 0.4 GPa for pure tungsten t…
In this paper we report the luminescence studies of octahedrally coordinated Cr3+ ions in a natural sample of kyanite (Al2O3:SiO2). The chromium ion can substitute for any one of the four nearly octahedral Al sites with the average metal-ligand distance of about 1.91 Å. Using absorption, excitation and emission spectr…
A compact electron polarimeter which operates at low scattering energies (100 eV) has been built and characterized. The polarimeter uses spin-dependent diffraction from a W(001) single crystal to measure the electron spin polarization of an incident electron beam. The design obtains reliable operation by attention to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal analysis and Raman spectroscopic measurements on the scandium iodide-cesium iodide systemM. M. Metallinou, L. Nalbandian, G. N. Papatheodorou, W. Voigt, and H. H. EmonsCite this: Inorg. Chem. 1991, 30, 22, 4260–4264Publication Date (Print):October 1, 1991Publication…
Morton K. Schwartz, Ph.D.; Lactic Dehydrogenase: An Old Enzyme Reborn as a Cancer Marker?, American Journal of Clinical Pathology, Volume 96, Issue 4, 1 October
The crystalline character of Saudi Arabian cotton fibers was studied using a wide angle x-ray diffraction technique. The purified cotton fibers were examined in their native state and after treatment with urea or caustic soda (NaOH). Cellulosic phases in Saudi Arabian cotton were identified by measuring and indexing t…
We have used the Incomplete Factorial Approach (Carter, C. W., and Carter, C. W., Jr. (1979) J. Biol. Chem. 254, 12219-12223) in conjunction with the program Cristal (Roussel, A., Serre, L., Frey M., and Fontecilla-Camps, J. (1990) J. Crystal Growth 106, 405-409) to crystallize six different proteins. We were able to…
Abstract A convenient method for the synthesis of 11‐[(4‐cyano‐4′‐ trans ‐α‐cyanostilbene) oxy]‐ undecanyl vinyl ether ( 6 ) which is the first member of a new class of mesogenic monomers is described. The polymerization of 6 initiated with CF 3 SO 3 H/S (CH 3 ) 2 in methylene chloride at 0°C proceeds through a living…
Abstract Hydrogen migration has been followed through the thermally‐grown oxide on a Zr–2.5% Nb alloy. A secondary ion mass spectrometer, calibrated for deuterium, was used to measure the concentration as a function of depth into the film. Thin film oxide specimens, grown in steam to ∼1 μm thickness, were heated to 35…
<div class="htmlview paragraph">Pressure-loss characteristics of a variety of single- and double-substrate metal-foil and ceramic-substrate converters with tapered and truncated inlet and outlet headers were measured in room-air flow, hot-gas flow, and engine-exhaust tests. Test data in the three different media…
The title compounds have been prepared by the reactions of a potassium diselenide solution in DMF with excess selenium in the presence of tetraethyl and tetrapropyl ammonium chloride, respectively. They were characterized by X-ray crystal structure determinations. (NEt 4 + ) 2 [Se 5 2- ·1 /2 Se 6 · Se 7 ]: Space group…
In this paper a broad phenomenological study of the hydrogen embrittlement of high strength pearlitic steels is presented. The experimental study includes fracture tests under aggressive environment on cracked and notched samples, with different electrochemical conditions and loading rates. SEM. fractography shows a n…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiastereoselective synthesis of phycocyanobilin-cysteine adductsJohn E. Bishop, Jon O. Nagy, John F. O'Connell, and Henry RapoportCite this: J. Am. Chem. Soc. 1991, 113, 21, 8024–8035Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Publis…
Abstract Poly(arylene ether imidazole)s were prepared by the aromatic nucleophilic displacement reaction of a bisphenol imidazole with activated aromatic dihalides. The polymers had glass transition temperatures ranging from 230 to 318°C and number‐average molecular weights as high as 82,000 g/mol. Thermogravimetric a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInhibition of calcium fluoride crystal growth by polyelectrolytesZahid AmjadCite this: Langmuir 1991, 7, 10, 2405–2408Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991https://pubs.acs.org/doi/10.1021/la0005…
The magnetization curling mode for an infinite cylinder with a uniaxial magnetocrystalline anisotropy is considered. The angular dependence of the nucleation field HN and the coercive force Hc are estimated as a function of the radius, the magnetocrystalline anisotropy, and the inclination of the axis to the applied f…
Deletion of the structural gene for phosphoglucose isomerase (pgi) of Escherichia coli dramatically alters the path of glucose catabolism by diverting carbon into the hexose monophosphate shunt. The effect of this genetic alteration on the conversion of glucose to tryptophan by strains optimized for the biosynthesis o…
Abstract Auger electron spectroscopy (AES) and factor analysis (FA) were applied to study the chemical structure of oxidized brass layers and rubber‐to‐brass interface of tyre cords. The optimum requirements of sample preparation, instrument performance, data acquisition and analysis were determined to ensure accurate…
Aqueous colloidal suspensions in the two systems of CVD‐processed ultrafine mullite powder (<0.1 μm), ‐Si 3 N 4 whisker and ‐mullite whisker, were prepared near the isoelectric point of mullite (pH 7.0) to prevent cracking during drying of wet green compacts consolidated by filtration. The freeze‐dried porous green…
Abstract Transmission electron microscopy (TEM), including selected area electron diffraction (SAED), has been used to identify polytypes in illite, phengite and muscovite from samples representing a wide range of diagenesis and low-temperature metamorphism. Samples include Gulf Coast sediments, sediments from the Sal…