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。
Elucidation of a complex defect configuration arising from the interaction between eight first-order twin boundaries in a diamond thin film prepared by chemical vapour deposition on a silicon substrate is reported. The defect has been identified by ultrahigh-resolution electron microscopy at 0.12nm resolution. It is s…
The chemical investigation of the hexane extract of the stem bark of Gordonia ceylanica afforded 3beta-acetoxy-11alpha(2',3'-epoxyferulyloxy)-olean-13(18)-ene as a new natural product and alpha-spinasterol for the first time from Gordonia.
Single Crystals of the Cerium(IV) Oxotellurate(IV) CeTe2O6 Orange-red, coffin-shaped single crystals of CeTe2O6 (monoclinic, P21/n; a = 703.71(5), b = 1106.32(8), c = 735.24(5) pm, β = 108.066(6)°; Z = 4) were obtained by the reaction of admixtures of cerium dioxide and tellurium dioxide (CeO2, TeO2; molar ratio 1 : 2…
Wet oxidation (WO) in subcritical conditions is a new alternative to usual routes for sewage sludge treatment that complies with environmental standards. This paper presents tests carried out using a batch reactor and continuous pilot and industrial units, treating municipal sewage sludge. The main products after oxid…
The oxidation behaviour of low alloyed steels, Fe‐0.6%Mn and Fe‐1.5%Mn, under different annealing conditions was studied. Due to the crucial importance of the surface state of the sample, the experiments were performed in an in‐situ device to avoid any contact with air after the annealings. The annealing experiments w…
Development of the next generation space telescope, to supplement the Hubble Space Telescope, has heightened the need for cryogenic actuators. High performance electromechanical materials are needed for use from 10 to 77 K. The use of piezoelectric materials to satisfy this need involves major property trade‐offs; con…
Phenomenological modeling on the thermomechanical behavior of shape memory alloy (SMA) plates with two-way shape memory effect (TWSME) is presented in this paper. Two important characteristics of SMA materials as sensors or actuators; the thermal responses and the transformation accompanied deformation; are described…
It has been pointed out by the present authors that it is essential to understand such mass transfer steps as diffusion of tritium in the grain of a breeder material, absorption of water vapor into bulk of the grain, adsorption of water on surface of the grain, and exchange capacity of tritium to be trapped to surface…
The conformational properties of the oxalamide group and crystal structure of several polyoxalamides have been investigated by computational methods. First, a detailed quantum mechanical study of the conformational preferences of N,N'-dimethyloxalamide is reported. Results, which were obtained at the MP2/6-31G(d) leve…
The crystal structure of the manganite Nd0.5Sr0.5MnO3 is studied at temperature T=300 and 77.3 K by means of an x-ray diffractometer. It is shown that the transition from the ferromagnetic metallic state to the antiferromagnetic insulating charge-ordered state is accompanied by a lowering of the symmetry of the struct…
An efficient method for the preparation of optically active ethyl β-aminobutyrate from the biopolymer, poly-( R)-(-)-3-hydroxybutyrate (PHB) obtained from bacterial cells has been established using chemical transformations: simple recovery of PHB from bacterial cells followed by acidic alcoholysis, tosylation, nucleop…
New type of Cu-AI-Nb -base alloys containing nickel, cobalt and chromium with high martensitic transformation temperatures have been developed. In this paper the mechanical properties, shape memory characteristics, the temperatures of reversible martensitic transformation and thermal stability of these alloys are pres…
The atomic configurations at macrotwin interfaces between microtwinned martensite plates in Ni 65 AI, 5 material are investigated using high resolution transmission electron microscopy (HRTEM). The observed structures are interpreted in view of possible formation mechanisms of these interfaces. A distinction is made b…
During the past few years, biomineralized manganese has been shown to cause ennoblement of various stainless steels to open circuit potentials of 300–400 mV/SCE. We have demonstrated that ennoblement, caused by biologically deposited manganese minerals, along with a relatively low stainless steel pitting potential, ca…
The title compounds were prepared by arc-melting cold-pressed pellets of the elemental components. They crystallize with a tetragonal structure already reported for CeCr 2 Si 2 C. It was refined from single-crystal X-ray data of PrCr 2 S 2 C: P4/mmm, a - 402.2( 1) pm, c = 535.2(1) pm, Z = 1, R = 0.012 for 252 structur…
Preferred crystallographic orientation, or texture, occurs almost universally, both in natural and man-made systems. Many components and devices in electronic and magnetic systems are fabricated from materials that have crystallographic texture. With the rapidly increasing use of thin film technology, where sharp axis…
Results of investigation of carbon films deposited with the use of gas-phase chemical reactions in the plasma of a dc discharge are presented. Films obtained at different parameters of the deposition process varied widely in their structure and phase composition, from polycrystalline diamond to graphite-like material.…
Several forms of the equation describing the radial motion of a spherical bubble in a compressible linear viscoelastic liquid are derived. The relative merits of these equations are discussed by using a three-parameter linear Oldroyd model to describe the non-Newtonian properties of the liquid.
The utilization of maltose by Clostridium acetobutylicum ATCC 824 was investigated. Glucose was used preferentially to maltose, when both substrates were present in the medium. Maltose phosphoenolpyruvate (PEP)-dependent phosphotransferase system (PTS) activity was detected in extracts prepared from cultures grown on…
A commercial oligosiloxane having two γ-hydroxypropyl endgroups and a number-average molecular weight (M̄n) around 1 000 Da was condensed with Bu2Sn(OMe)2 yielding tin-containing macrocycles but no polymers. These macrocycles reacted with γ-thiobutyrolactone by insertion of one thiolactone per Sn—O bond. When ε-caprol…