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。
We have prepared ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3+\ensuremath{\delta}}$ single crystals for not only oxygen-deficient $(\ensuremath{\delta}<0)$ but also oxygen-excess $(\ensuremath{\delta}>0)$ regions. Although resistivity $\ensuremath{\rho}(T)$ is less sensitive to $\ensuremat…
Three cyano-bridged aqua(N,N-dimethylacetamide)(cyanoiron)lanthanide complexes were synthesized by the reaction of K3Fe(CN)6, Ln(NO3)3⋅6 H2O (Ln=Sm, Gd, Ho), and N,N-dimethylacetamide (DMA). The obtained complexes 1 – 3 exhibit different coordination geometries and crystal structures. The polymeric {[Sm(DMA)2(H2O)4Fe(…
Abstract Equilibrium sorption and uptake kinetics of n ‐butane and n ‐pentane in uniform, biaxially oriented, semicrystalline polyethylene terephthalate films were examined at 35 °C and for pressures ranging from 0 to approximately 76 cmHg. Sorption isotherms were well described by the dual‐mode sorption model. Sorpti…
Abstract The effects of interchange reactions on the solid‐state structure and mechanical properties of a 70/30 poly(ethylene terephthalate) (PET)/bisphenol A polycarbonate (PC) blend were studied. Increasing reaction levels were obtained by means of lower screw speeds in the extruder. The progressive production of co…
We measured the pressure dependence of the room-temperature infrared absorption spectrum of the pseudocubic ${\mathrm{La}}_{0.75}{\mathrm{Ca}}_{0.25}{\mathrm{MnO}}_{3}$ manganite. On increasing pressure up to 10 Gpa we observe the increase of a broad band associated with polaronic absorption, which partially screens t…
Low-temperature growth of AlxGa1-xAs by the solution-liquid-solid mechanism affords nanowhiskers having two specific overall compositions: x = 0.1 and 0.8. Intermediate compositions (0.1 < x < 0.8) are inaccessible by the method employed. Examination of the nanowhiskers by transmission electron microscopy, photolumine…
Abstract A number of N ‐substituted poly(aspartic acid)s was prepared under mild conditions using the silylation–alkylation technique. Their physical properties were studied. Free swelling capacity (FSC) tests were performed for polymers obtained by crosslinking the parent poly(aspartic acid) as well as its defunction…
Abstract Migration behaviors of antiozonants in carbon black‐filled rubber vulcanizates with different rubber compositions of natural rubber (NR), styrene–butadiene rubber (SBR), and butadiene rubber (BR) were studied at constant temperatures of 40–100°C and outdoors. Three single rubber‐based vulcanizates, three bibl…
We have studied the influence of the magnetic structure of the spacer layer on the interlayer exchange coupling and on the correlation between the coupling and magnetoresistance in MnGa-based trilayers with antiferromagnetic $({\mathrm{Mn}}_{2}\mathrm{As}),$ ferrimagnetic $({\mathrm{Mn}}_{2}\mathrm{Sb}),$ and semicond…
The effect of γ-irradiation on some physical properties of rare earth ferrite of the general formula Li 0.5 + z Co z Yb x Fe 2.5-2 z - x O 4 , ( z = 0.1, x = 0.00, 0.025, 0.050,...,0.200) was discussed. The temperature dependence of the polarization and resistance was studied in the range (300 K⩽ T ⩽700 K) at differen…
Abstract Factors—including time, temperature, morphology, and thickness of sample, the extent of silane grafting, and water concentration—that affect the rate and degree of water crosslinking reactions of the silane‐grafted LDPE are investigated. The gel content of the water‐crosslinked sample increases with increasin…
The effect of nonionic surfactants on the disproportion kinetics of copper sulfide nanoparticles (aqueous sols) from the golden brown, copper-rich phase (Q-Cu 2 S) to the green covellite phase (Q-CuS) has been presented. The transformation follows a first-order rate law. There is a substantial decrease in the rate of…
The three-dimensional structure of the lytic transglycosylase from bacteriophage lambda, also known as bacteriophage lambda lysozyme, complexed to the hexasaccharide inhibitor, hexa-N-acetylchitohexaose, has been determined by X-ray crystallography at 2.6 A resolution. The unit cell contains two molecules of the lytic…
Abstract The effect of blend ratio of natural rubber/epoxidized natural rubber (SMR L/ENR 25) and natural rubber/styrene‐butadiene rubber (SMR L/SBR) blends on scorch time ( t 2 ), cure time ( t 90 ), resilience, hardness, and fatigue properties were studied in the presence of carbon black and silica. An accelerated s…
Electrical treeing in an epoxy resin under an ac voltage for a point-to-plane gap configuration has been investigated using a phase-resolved partial discharge measurement system and shadow survey and light emission registration techniques. A self-consistent model based on the concepts of energy and electric field has…
Studies of the influences of temperature, hydrostatic pressure, dc biasing field, and frequency on the dielectric constant $({\ensuremath{\varepsilon}}^{\ensuremath{'}})$ and loss $(\mathrm{tan}\ensuremath{\delta})$ of single crystal ${[\mathrm{P}\mathrm{b}(\mathrm{Z}\mathrm{n}}_{1/3}{\mathrm{Nb}}_{2/3}{)\mathrm{O}}_{…
The first page of this article is displayed as the abstract.
Abstract A study of the dynamic complex and steady shear viscosity of isotactic polypropylene (iPP), ethylene–propylene diene terpolymer rubber (EPDM) and three different blends of both polymers are presented over a range of temperatures and frequencies. Moreover, the processability of these materials is studied throu…
Density functional supercell calculations were carried out by a mixed-basis pseudopotential method for the Σ3 (111) [1 0] symmetrical tilt grain boundary in strontium titanate, SrTiO 3 , as a prototype planar defect in an electro-ceramic material. A low grain boundary energy of 0.52 J m -2 was obtained. Minor structur…
Abstract Enzyme‐catalyzed transesterification of several cellulose solids in organic media have been investigated. Several protease enzymes were made soluble in organic media through ion‐paired enzyme–surfactant complexes. Subtilisin Carsberg was found to be catalytically active in the transesterification of cellulose…