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。
On the basis of the new concept of elemental strain, used to describe a possible aging process occurring in polymeric materials, the expression for the life model, already proposed in a previous paper, must be modified, taking into account the possibility that the local strain is an elemental property of the polymer m…
This article documents the formation of a block copolymer of poly(lactic-co-glycolic acid) and polylysine via a simple coupling technique using dicyclohexyl carbodiimide (DCC). The resulting polymer has been characterized via UV-Vis spectroscopy, GPC, (1)H NMR, and elemental analysis, is soluble in a wide variety of s…
SUMMARYGeneral aspects of electropolishing of stainless steel have been reviewed. Some suitable bath parameters have been enumerated. The possible mechanisms for electropolishing of stainless steel have been briefly outlined. Various factors that affect the polishing of stainless steel have been cited. The processes o…
BACKGROUND AND PURPOSE: Intraoperative MR imaging is increasingly being used to control the extent of surgical resection; however, surgical manipulation itself causes intracranial contrast enhancement, which is a source of error. Our purpose was to investigate the potential of monocrystalline iron oxide nanoparticles…
The new standard IEC 60270/FDIS[2000] for partial discharge(PD) measurement has been published in September 2000, which builds up an integral quality assurance system for PD measurement based on the IEC 60060-2[1994]. It takes traceability of quantity as its core in order to ensure accuracy of measuring results, compa…
The limitations of currently used heart valve devices are well known. For prosthetic valves they include infection risk and thrombembolic complications; biologic devices have limited durability. Particularly for pediatric cardiac patients the problem of a lack of growth potential remains a serious issue. The multidisc…
Novel hybrid organic–inorganic catalysts constituted by iron(III) or manganese(III) 5,10,15,20-tetrakis(pentafluorophenyl) porphyrin entrapped in an alumina amorphous matrix have been prepared. The hybrid materials were obtained by a non-hydrolytic sol–gel route, through the condensation of aluminium chloride with dii…
Oxidation of gold nanoparticles protected by thiolated β-cyclodextrin molecules, leads to formation of water-soluble polycyclodextrin nanocapsules held together by S–S bonds.
Acoustic techniques are accepted generally for diagnostics of gas-insulated systems (GIS). This paper addresses the problem of risk assessment of moving particles. The main part of the paper gives a general understanding of internal particle movement and excitation of external acoustic signals, leading to signature an…
We studied the physicochemical, piezoelectric and dielectric properties of collagen–chitosan films, with regard to the development of new biomaterials which have potential applications in the coating of cardiovascular prostheses, support for cellular growth and in systems for controlled drug delivery. The piezoelectri…
The high proton conductivities of doped barium and strontium cerates has led to their consideration as electrolytes in fuel cells operating at intermediate temperatures (600-800°C). The electrochemical properties of Pr-doped barium gadolinium cerate [ Ba ( Ce 0.8 − y Pr y Gd 0.2 ) O 2.9 ] have been investigated as par…
Abstract—We have constructed mimetic finite difference methods for both the TE and TM modes for 2-D Maxwell’s curl equations and equations of magnetic diffusion with discontinuous coefficients on nonorthogonal, nonsmooth grids. The discrete operators were derived using the discrete vector and tensor analysis to satisf…
All articles of this category Catalytic enantioselective Baeyer-Villiger oxidations of 3-substituted cyclobutanones with cumene hydroperoxide as oxidant have successfully been performed in the presence of chiral magnesium catalysts. The combination of enantiopure BINOL and a variety of Mg reagents is able to promote t…
Copper corrosion rate and corrosion products originating from acetic acid vapors have been studied using gravimetric, scanning electron microscopy, X-ray photoelectron spectroscopy, and argon-ion sputtering techniques. Copper specimens were exposed to the action of 10, 100, and 300 ppm acetic acid vapors generated in…
Compositionally homogeneous indium tin oxide (ITO) ceramics with low porosity were obtained successfully by sintering hydrothermally prepared powders. The fabrication technique began with the preparation of microcrystalline, homogeneously tin‐doped (5 wt%) indium oxyhydroxide powder, under hydrothermal conditions. Low…
A new rate law for the growth of anodic passive films on metal surfaces is derived from the point defect model (PDM). The model recognizes both the growth of the barrier oxide layer into the metal via the generation of oxygen vacancies at the metal/film interface and the dissolution of the barrier layer at the film/so…
In this research, the carbides of as-cast AISI M7 high-speed steel, in which different amounts of V and W were replaced by equivalent Ti and Nb, were investigated using light and electron microscope. EDX and WDX analysers were used in order to recognize the type and formulae of carbides. The volume fractions of each t…
The influence of the polymerization time and rate as well as the solution's ionic strength on the morphology, conductivity, and molecular structure of the polypyrrole (PPy) microtubule [synthesized by the template-free method in the presence of β-naphthalene sulfonic acid (β-NSA) as the dopant] were investigated. It w…
An esterase hydrolyzing phthalate esters has been purified from Micrococcus sp. YGJ1. The enzyme, a monomeric protein (Mr = 56 kDa) with a pI of 4.0, hydrolyzes various aliphatic and aromatic carboxylesters. The medium chain (C3-C4) esters are the most preferred substrates. The enzyme is inhibited by HgCl2 and p-chlor…
Characteristic dark domains are observed around the tips of electrodes in in-plane switching-mode liquid crystal displays. In these domains, the liquid crystal molecules rotate in the reverse direction because of the radially distorted electric field. We found that these domains extend toward the central area when a h…