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。
Adenylate kinases have an M(r) around 23,000 which classifies them among the smallest phosphoryl group transferring enzymes. In order to prevent phosphoryl transfer to water, i.e. hydrolysis, these enzymes undergo induced-fit motions on substrate binding and assemble/disassemble their catalytic centres during each rea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn investigation of the effects of ultrasound on degradable polyanhydride matricesAntony D'Emanuele, Joseph Kost, Jennifer L. Hill, and Robert LangerCite this: Macromolecules 1992, 25, 2, 511–515Publication Date (Print):January 1, 1992Publication History Published online1 Ma…
Martensitic (shear displacive) phase transformations of the tetragonal to monoclinic and the reverse transformations in Y2O3 doped tetragonal ZrO2 ceramics, which are thought to be included in the displacive phase transformations, were found to propagate isothermally, while in contrast, in CeO2 doped ZrO2 a burst-like…
We deal with the packing of distributions of particles, or polydisperse systems. We will cover the various study from the early 1900's to the present. The papers contributing to the principles of packing will be discussed
The control of three modifications and crystal shape of calcium carbonate which precipitated by outgassing dissolved CO2 in calcium hydrogencarbonate solution was studied. The starting saturated solution (10.3×10-3mol CaCO3⋅dm-3) of calcium hydrogencarbonate was prepared by passing a stream of CO2 through the suspensi…
Abstract 2‐Perfluoro(alkyl)ethyl vinyl ethers, F(CF 2 ) n CH 2 CH 2 OCHCH 2 , ( n = 6 or 8), were synthesized and polymerized by means of cationic initiators (HI/ZnI 2 and CF 3 SO 3 H/(CH 3 ) 2 S). The perfluorohexyl‐substituted poly(vinyl ether) is completely amorphous. The polymer with perfluorooctyl segments shows…
Abstract The use of living linking reactions of poly(styryl)lithium with 1,3‐bis(1‐phenylvinyl)benzene followed by crossover reactions with styrene or butadiene monomers has been used to prepare four‐armed heteroarm, star‐branched polymers. Bimodal molecular weight distributions have been observed for crossover reacti…
A description is given of an x-ray emission spectrometer with high spatial (4 μm) and energy resolution (0.3-1.2 eV) and of its application to the study of electronic structure of transition metal mono- and disilicides, carbon coatings, vanadium boride and silicon/silicon nitride systems. A comparison is made with oth…
Abstract The reactions of monomaleamic acid derived from an aromatic diamine with furfural afforded a novel class of furfurylidene‐substituted maleamic acids 2a–2d . The latter were cyclodehydrated to yield maleimides 3a–3d which are AB‐monomers for a Diels–Alder polymerization. In addition, N ‐furfurylmaleamic acid (…
X-Ray crystal analysis has revealed that two sulfur atoms of a bis(ethylenedithio)tetrathiafulvalene radical cation, BEDT-TTF+, are coordinated to copper(I) atoms in a –Cu–Br–Cu–(µ-Br)2–Cu– chain, in which each copper atom has a distorted tetrahedral coordination with a sulfur atom and three bromine atoms.
The reactor pressure vessel of a pressurized water reactor can be embrittled by neutron irradiation from the core It has been recognized for many years that copper plays a significant role in the embrittlement process and more recently that copper precipitates pin dislocations In developing fundamental understanding a…
The porous silica gels were prepared from tetramethoxysilane (TMOS)-polyethyleneglycol (PEG)-H2O-methanol solution by the sol-gel process. Microstructure of gel was affected by the composition of starting solutions. The pore diameter of porous gels ranged from 0.1μm to 10μm. The pore diameter increased with increasing…
The crystal structure of the cubic perovskite Sr2FeTiO5.81 has been refined in space group Pmm using neutron powder diffraction data collected at 2 K. There is no evidence for long-range magnetic order. Mössbauer and magnetic susceptibility data show a phase transition in the vicinity of 20 K which has been interprete…
To improve the adhesion between poly(p-phenylene terephthalamide), PPTA, fiber and silicone rubber, the surface modification of PPTA was investigated. Combining plasma treatment and coupling agent treatment with the silicone adhesive was found to be effective in improving adhesion. The combination process made the pul…
Intrazeolite AuI carbonyls (νCO= 2188 cm–1) and nitrosyls (νNO= 1820 cm–1) are formed by the reductive carbonylation of monolayer-dispersed AuCl3 in NaY cages, which exhibit catalytic activity for NO reduction with CO at 300–373 K.
Starburst precursor molecules based on π-electron systems, tri(biphenyl-4-yl)amine and tri(p-terphenyl-4-yl)amine, are found to constitute a new class of amorphous molecular materials with relatively high glass-transition temperatures of 76 and 132 °C, respectively.
The activity of a series of supported Pt catalysts for the hydrogenation of benzene has been evaluated at 80 °C and 1 atm total pressure. Three sets of catalysts with a wide range of percent metal exposed were investigated: Pt/Al2O3, Pt/Al2O3-Cl and Pt/SiO2, with the Cl series obtained by exposure of Pt/Al2O3 to HCl o…
The compound [Cu2(bipy)2(OH)2(CF3SO3)2](bipy = 2,2′-bipyridine) has been synthesised and its crystal structure determined by X-ray crystallographic methods. Crystals are triclinic with a= 8.165(2), b= 14.265(2), c= 18.748(5)Å, α= 93.10(1), β= 100.58(2), γ= 99.17(1)°, space group P, and Z= 3. Least-squares refinement o…
Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular ar…
To clarify the difference in the three-dimensional structure of collagen fibrillar networks of several muscles, a cell-maceration/scanning electron microscope (SEM) method was applied for tiger puffer, sardine, carp, and rabbit muscles in parallel to evaluate muscle firmness. Tiger puffer and rabbit muscles, whose tex…