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。
Abstract The diffusion and permeation coefficients for He, H 2 , D 2 , O 2 , and N 2 in a variety of elastomers were measured by simple manometric methods. The elastomers studied were butyl rubber; Hypalon® 40 and 45; Viton® E60 and GF; Hydrin® 100 and filled Hydrin® 100; Kraton® G, FG, and KG VTEOS; EPDM; epoxidized…
The gene encoding component E, the large subunit, of adenosylcobalamin (coenzyme B12)-dependent glutamate mutase from Clostridium tetanomorphum has been cloned and sequenced. The mutE gene encodes a protein of 485 amino acid residues, with M(r) 53,708. The mutE gene is situated some 1,400 bp downstream of the mutS gen…
Be-doped cubic boron nitride (c-BN) powders, prepared at 5 GPa and 1700 °C by using Li3BN2 as a catalyst, were sintered at 7.7 GPa and 2100 °C without the addition of any sintering aids. The polycrystals so obtained were p-type semiconductors as determined by the electric and thermoelectric methods. Nonlinear current-…
We report x-ray diffraction measurements of the effects of electric fields on charge-density-wave (CDW) structure in ${\mathrm{NbSe}}_{3}$. For fields exceeding the CDW depinning field ${\mathit{E}}_{\mathit{T}}$, the (0 1+Q 0) CDW superlattice peak shifts along ${\mathit{b}}^{\mathrm{*}}$. The shift increases rapidly…
Abstract Shrinkage, retractive stress, and infrared dichroism of the drawn low‐density polyethylene (LDPE) as‐drawn and irradiated by 60 Co‐ray have been measured under different annealing conditions. The shrinkage and the disorientation of the irradiated sample was undergone more rapidly than that of unirradiated one…
Abstract The surface compositions and characteristics of perfluorodecanoic acid (PFDA)‐grafted polyurethane (PU) were investigated to understand its enhanced blood compatibility. The grafting of PFDA was identified by attenuated total reflectance–Fourier transform infrared (ATR–FTIR). The results from angular‐dependen…
Abstract Isothermal and constant heating rate thermogravimetric analysis (TGA) experiments have been performed for examining decomposition of polymers and composites. In practice, low heating rates are necessary to obtain good resolution under nonisothermal conditions thus increasing the time required for experiments.…
The use of high-temperature nuclear magnetic resonance (NMR) spectroscopy provides a means of investigating the structure of refractory aluminate liquids at temperatures up to 2500 K. Time-averaged structural information indicates that the average aluminum coordination for magnesium aluminate (MgAl(2)O(4)) liquid is s…
Textures of calcite crystals from a variety of mineralized tissues belonging to organisms from four phyla were examined with high-resolution synchrotron x-ray radiation. Significant differences in coherence length and angular spread were observed between taxonomic groups. Crystals from polycrystalline skeletal ensembl…
Article Crystal structure of hexasodium heptaselenodisilicate, Na6Si2Se7 was published on February 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 203, issue 2).
This paper reports the formation of a new series of Ho3+ -doped fluorophosphate optical glasses in the chemical formulae: 50 (NaPO3)6 + 18 BaF2 + 10 ZnF2 + 20 RF + 2 HoF3 where RF = LiF, NaF, KF, (LiF-NaF), (NaF-KF) and (KF-LiF). The physical properties, absorption and photoluminescene spectra have been measured to un…
Abstract A total of about 37 000 diffracted intensities has been measured at 20 K for a spherical single crystal of citrinin. Using a multipole formalism to interpret the X-ray data, maps of the charge density and of its Laplacian, as well as for the electrostatic potential have been derived. A value of 7(2) D has bee…
Aluminum nitride powder was synthesized from aluminum polynuclear complexes. Basic aluminum chloride (BAC) provided the aluminum polynuclear complexes. The effect of the milling treatment for the precursor made from basic aluminum chloride and glucose on the particle size was investigated. BAC and glucose were dissolv…
A continuous mixed-suspension mixed-product removal lpar;CMSMPR) crystallizer was used to study the crystallization kinetics and product purity of glutamic acid crystal in pure solution and impure solution with L-phenylanaline as the impurity. Under the assumption that the crystal growth rate was a function of crystal…
The polar regions in polycrystalline Ba(Ti1-x Snx)O3 in the temperature range 600K - Tp, where Tp is the temperature of para-ferroelectric phase transition, are independent of the content of Sn-substitution. A decrease of volume of polar regions at the increase of x leads to the rapid decrease of relative volume of fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, synthesis, and properties of chemical vapor deposited diamond on inorganic oxide catalysts: experimentation and simulationKhushrav E. Nariman, Jan J. Lerou, Kenneth B. Bischoff, and Henry C. FoleyCite this: Ind. Eng. Chem. Res. 1993, 32, 2, 263–273Publication Date (P…
Using infrared spectroscopy it has been shown that the mechanical load increases the rate of thermo-and γ-radiation of polyvinyl alcohol (PVA) and photooxidative degradation. The inclusion of reactive dye in the polymer inhibits these processes.
Article Crystal structure of calcium magnesium nickel tetrahydride, CaMgNiH4 was published on February 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 207, issue 2).
Abstract Bis(4,4′‐benzoyl chloride) dimethylsilane (SiCO) and 2,2‐bis(4,4′‐benzoyl chloride) propane (CCO) were synthesized and polymerized with butanediol, resorcinol, or hydroquinone. The polymers of SiCO–hydroquinone (SiCO–Hyd) and SiCO–resorcinol (SiCO–Res) possess glass transition temperatures 25°C lower than the…
Thin film ferroelectrics are technologically important materials. Doped or undoped lead zirconate titanate (PZT) and lead titanate (PT) films are of special interest since they have numerous applications in electro-optic, piezoelectric and non-volatile memory devices. In this brief overview, PZT films deposited by rf-…