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。
As part of an effort to understand the mechanisms of light-induced effects in a-Al2O3:C the phototransferred thermoluminescence (PTTL) peaks at ~260 K and at ~450 K have been monitored as a function of the time of illumination, the temperature to which the sample is heated between irradiation and illumination, the wav…
Abstract Single crystals of β‐Ga 2− x In x O 3 with x = 0 to 0.2 have been grown by the float zone technique using radiation heating. When x increases from 0 to 0.2, the interionic distance O‐Ga in the gallium octahedron and tetrahedron increase on the average by 1 to 1.5% and, as a consequence, the position of the st…
A new liquid crystalline photoconductor, 2-(4'-heptyloxyphenyl)-6-dodecylthiobenzothiazole exhibiting a smectic A (SmA) phase between 90° C and 100° C was synthesized and its photoconductive behavior was characterized by steady-state current-voltage measurements under ultraviolet illumination. A large photocurrent wit…
Abstract Crystallization Analysis Fractionation is a new technique for the analysis of composition distribution in semicrystalline polymers; more specifically for the analysis of branching distribution in Polyethylene and tacticity in Polypropylene type resins. CRYSTAF as well as TREF (Temperature Rising Elution Fract…
A determination of stacking fault energy (SFE) of the austenite phase of a duplex stainless steel, material no. 1.4462, has been carried out using transmission electron microscopy (TEM). Furthermore, cold rolling tests and microstructural analysis have been realized in order to allow a detailed discussion of the obtai…
Abstract The tripeptide glutathione (γ‐ L ‐Glu‐ L ‐Cys‐Gly, GSH) is thought to play an important role in the pharmacology of bismuth drugs, but to our knowledge no chemical studies of bismuth glutathione complexes have been reported. We report here studies of interactions of the antiulcer compound ranitidine bismuth c…
Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. A similar crystalline to highly disordered solid phase transition is reported in this study for two zeolites, scolecite and mesolite. Pressure-induced amorphization is demonstrated using in…
Removal of oxygen ions by thermogravimetric methods in $\mathrm{CaMn}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ ($0<~\ensuremath{\delta}<~0.34$) produces electron doping of the material and ${\mathrm{Mn}}^{4+}$ ions are reduced to a trivalent state. Electrical resistivity measurements in samples with con…
The crystalline structure of dried cotton fibers at varying development stages has been investigated using wide angle x-ray diffraction (WAXS) techniques. The cellulose I crystalline structure has been confirmed on dried SJ-2 Acala cotton fibers collected at varying developmental stages and at maturity. The cellulose…
The microstructures of lithiated graphite were studied using high‐resolution transmission electron microscopy (HRTEM) and x‐ray diffraction (XRD). HRTEM shows lattice images of the (001) layers of with layer spacing of 3.70 Å, consistent with XRD. The morphology and distribution of the and phases were investigated by…
The differential, total, and transport cross sections for electrons and positrons impinging on free atoms and solid targets have been calculated in the energy range of 100–5000 eV. As an application, the mean number of the wide angle collisions suffered by the particle before slowing down to rest and the backscatterin…
Abstract Prograde evolution of illite/smectite occurring in an unusually-thick (8000 m) sequence of Mesozoic-Cenozoic sediments in the Basque-Cantabrian Basin, Spain, has been studied using XRD and TEM/AEM. The sediments, which are only slightly tilted, cover the range from smectite to illite, and the most deeply buri…
Structural parameters and their thermal changes in natural magnetite, Fe 3 O 4 , have been studied using the single-crystal X-ray diffraction method in the temperature range 126–773 K. The cell dimensions, oxygen coordinate and atomic mean square displacements (m.s.d.'s) reversibly change as a function of temperature.…
When cells of two auxotrophic mutants of Sulfolobus acidocaldarius are mixed and incubated on solid medium, they form stable genetic recombinants which can be selected, enumerated, and characterized. Any of a variety of auxotrophic markers can recombine with each other, and the phenomenon has been observed at temperat…
Haloalkane dehalogenase converts halogenated alkanes to their corresponding alcohols. The active site is buried inside the protein and lined with hydrophobic residues. The reaction proceeds via a covalent substrate-enzyme complex. This paper describes a steady-state and pre-steady-state kinetic analysis of the convers…
A finite-element formulation which derives constitutive response from crystal plasticity theory is used to examine localized deformation in fcc polycrystals. The polycrystals are (simple) idealized three-dimensional arrangements of grains, and many elements per grain. Non-uniform deformations within individual grains…
ABSTRACT Three potential photosensitizers for photodynamic therapy: tetra‐ t ‐butyl phthalocyaninato Zn(II), tetrakis‐(1,1‐dimethyl‐2‐phthalimido)ethylphthalocyaninato Zn(II), and tetrakis‐(1,1‐dimethyl‐2‐amino)ethylphthalocyaninato Zn(II), have been studied in homogeneous organic media. Dimerization constants and mon…
Abstract Kaolin has been used as an alternative cheap raw material for the synthesis of zeolite 4A. Two steps are involved in the reaction: (1) dehydroxylation of kaolin at 550–900°C to form an activated X-ray amorphous material called metakaolin; (2) hydrothermal treatment of metakaolin with aqueous alkali to form th…
The polarization resistance of composite electrodes for solid oxide fuel cells was modeled by three‐dimensional random‐resistor networks. These were generated on a computer by identifying neighbors in cubic lattices randomly occupied by electrolyte particles (ionic conductors) or electrode particles (electronic conduc…
Components of the proteinaceous cement secreted by barnacles have yet to be studied because of their insolubility. We solubilized and characterized the proteins of secondary cement, which is produced when the barnacle is detached from the substratum, in Megabalanus rosa. The cement was fractionated, according to its s…