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。
delta 5-3-Ketosteroid isomerase (EC 5.3.3.1) of Pseudomonas testosteroni promotes the highly efficient isomerization of delta 5-3-ketosteroids to delta 4-3-ketosteroids by means of a direct and stereospecific transfer of the 4 beta-proton to the 6 beta-position, via an enolic intermediate. An acidic residue responsibl…
A biologically inert photolabile precursor of carbamoylcholine has been synthesized; it is photolyzed to carbamoylcholine, a well-characterized acetylcholine analogue, with a half-time of 40 microseconds at pH 7.0 and a quantum yield of 0.8. The compound, N-(alpha-carboxy-2-nitrobenzyl)carbamoylcholine, was synthesize…
A LEED structure analysis is performed for the W(100) c(2*2) surface reconstruction. Models with pure vertical displacements of the surface atoms can be clearly ruled out while others with predominant lateral displacements in the (11) and (01) directions result in a very good agreement with the experimental curves. Ho…
The Raman and infrared absorption spectra, optical gaps, and electron spin densities of amorphous carbon films deposited from hydrocarbon plasmas have been systematically studied as a function of deposition conditions and Raman probe wavelength. Although all other probes are consistent with a monotonic increase in int…
Abstract A dynamic crack tip shielding model has been developed to describe the brittle-ductile transition (BDT) of precracked crystals in constant strain-rate tests. Dislocations are emitted from a discrete number of sources at or near the crack tip. At the BDT the dislocations are emitted and move sufficiently rapid…
Abstract N , N ′‐bis(3,3′‐itaconimidophenyl) sulfone has been synthesized by reacting itaconic anhydride with 3,3′‐diamino diphenyl sulfone. The bisitaconimides and the intermediates were characterized by chemical analysis, IR, NMR, TG, and GPC. The degree of polymerization (DP) of the prepolymers of the bisitaconimid…
Abstract The homopolymers, poly(3,3‐bisethoxymethyl oxetane) (polyBEMO), poly(3,3‐bisazidomethyl oxetane) (polyBAMO), and triblock copolymers based on these homopolymers and a statistical copolymer center block composed of BAMO and 3‐azidomethyl‐3‐methyl oxetane AMMO were synthesized and characterized by differential…
Their Electrical
Abstract Poly(ethylene oxide) (PEO) has been covalently immobilized on poly(ethylene terephthalate) (PET) films using a radio frequency glow discharge polymer deposition process, followed by chemical coupling. Amino or hydroxyl groups were introduced onto the surface of the PET by exposing the films to allylamine and…
The breakage of nylon membrane microcapsules is proposed as a new method to study and quantify shear effects in biological systems. A critique of this method shows that a narrower particle size distribution may be an important improvement in the breakage study as well as breakage control in many bioreactor and biotech…
Abstract The strength properties of composites made of untreated cellulose fibers and linear low density polyethylene were investigated as a function of processing parameters. Studies have shown that the strength properties of composites increase with processing time and temperature. The increase in strength is accomp…
The acoustic-phonon velocities of a single crystal of BaTi${\mathrm{O}}_{3}$ have been measured as a function of pressure up to 8 GPa, including the transition pressure ${p}_{c}=2.35$ GPa, by means of Brillouin scattering technique. Only one elastic eigenmode shows an anomalous decrease on approaching ${p}_{c}$ and th…
We present photoemission spectra from the $3p$ level of Cu(100) obtained in coincidence with the ${M}_{3}\mathrm{VV}$ Auger line. The $3p$ level is narrowed from its 2.2-eV core-lifetime-broadened width to 1.0 eV, representing the intrinsic width of the $^{1}G$ Auger final state. The core line changes its energy withi…
When a bead heap is submitted to low-frequency ($\frac{\ensuremath{\omega}}{2\ensuremath{\pi}}=10\ensuremath{-}1000$ Hz) vertical vibrations at a large enough amplitude $a$, its horizontal free surface becomes unstable and a stationary state is reached. This one is characterized firstly by a free surface which is incl…
The effect of industrial beating on tensile strength properties has been compared with laboratory beating and the differences observed have been explained in terms of fibre properties. Tensile strength development is less pronounced for industrial beating than for laboratory PFI-mill beating. Beating in the laboratory…
We invoke the term semiorganic to describe a new class of nonlinear optical compounds composed of part organic and part inorganic constituents. The recently reported crystal 1-arginine phosphate (LAP) is one such material where organic 1-arginine molecules form cations and crystallize with inorganic phosphate anions.…
In 1987, a serious radiological accident occurred in Goiania, Brazil. Four inhabitants died and about 250 persons were internally or externally contaminted with 137Cs released from a removed and then broken source vessel. In this report, outline of the accident and, activities on surveillance of contamination and work…
(1989). Application of one-sided welding to field girth joint of large scale penstock. Welding International: Vol. 3, No. 12, pp. 1046-1050.
The interaction between water and cellulose has been studied by deuterium NMR and water sorption isotherm measurements for a bleached kraft pulp and an unbleached liner board pulp beaten to various degrees. Measurements of 2H quadrupole splittings, spin lattice relaxation rates and half height line width shave been ca…
目的 : 被服の保温性能を決める上で, 被服材料と空気層との相互作用は重要な要素であるので, 多様な被服材料について, 空気中に水平に設置した熱板から被服材料および介在する空気層を通して大気への熱損失を測定し, 自然対流による熱輸送が支配的な極低風速のもとでの, 布および空気層からなる系の伝熱特性を調べた.成果 : 多様な材料のうち, とくに, サージ, モスリン, フラノ, レザーの典型的な4種類の材料については, 測定結果を布/大気, 空気層/布/大気の伝熱モデルと比較することによって, 各構成要素の熱輸送への寄与を分離し, 空気層, 布, 大気, 各々の熱通過率, および, 布のみで被覆した場合の布と熱板との接触抵抗にっいて…