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。
Electrical aging of polyethylene was inhibited effectively by blending a kind of voltage stabilizer into it. Samples of polyethylene with and without the voltage stabilizer were electrically aged for various time, and then space charge distribution of these samples was measured under dc stress and being short circuite…
On-line partial discharge (PD) testing has been used for decades to help maintenance personnel detect stator winding insulation problems in motors and generators. Specifically, the test can often find loose, delaminated, overheated, and contaminated windings, well before these problems lead to failure. As a result, on…
La cinetique de la delignification et de la degradation de la cellulose pendant la cuisson kraft, kraft-AQ, polysulfure (PS), et kraft-polysulfure-AQ (PSAQ) de l'epinette noire a ete etudiee en termes d'indice Kappa et de viscosite de la pâte comme fonction du temps de cuisson et de la temperature. Les essais ont ete…
The properties of carbon black filled rubber compounds are greatly influenced by the extent of filler microdispersion. Dispersion takes place during mixing where carbon black pellets are broken up under shear forces into individual aggregates/ agglomerates and distributed throughout the polymer matrix. After the mixin…
A niche in the textile industry provides high strength, high modulus textile fabrics to the construction industry as a potential replacement for more traditional building materials such as wood, concrete, masonry, and steel. The mechanical properties of fabrics made of aramid, carbon and glass fibers lend themselves t…
The rate of copper dissolution in presence of phosphoric acid tert-butanol electropolishing mixtures was studied by measuring the limiting current which represents the rate of electropolishing. The rate of dissolution decreases by increasing phosphoric acid concentration, electrode height and the mole fraction of alco…
The present work is focused on the effects produced by hydrostatic pressure on Cu 2+ (<100 ppm) doped (C 2 H 5 NH 3 ) 2 CdCl 4 single crystal. The energy E u ( ~ ) of the e u ( ~ ) M b 1 g (∼ x 2 m y 2 ) charge-transfer transition of (C 2 H 5 NH 3 ) 2 CdCl 4 : Cu 2+ undergoes a red shift of 1400 cm m 1 on passing from…
Following the incident (through-wall crack and crazing zones) of May 1998 on the principal mixing zone of the residual heat removal system at CIVAUX nuclear plant, EDF has initiated a R&D programme to understand the incident and assess the risks of damage on other nuclear plant mixing zones. The programme includes…
This paper deals with the photoemission activity of radiation defects in crystalline and vitreous silica. Spectral and kinetic parameters and the concentration of defects in the surface layer and the bulk of the material were determined. Some features of the distribution of radiation-induced defects along the depth of…
We present the results of simulations using both atomistic and density functional theory (DFT) approaches that illustrate the uses of these techniques for investigating the structure and electronic structure of defects at the surfaces of oxides. Atomistic simulation studies of the low index surfaces of spinel (MgAl 2…
The fatigue behaviour of two duplex stainless steels (DSS) alloyed with different nitrogen contents (0.24 and 0.4 wt%) has been studied in air and in a NaCl-containing water solution. Both of the alloys exhibit a cyclic softening preceded by a cyclic hardening at high strain amplitude as reported in the literature for…
Abstract New troponoid liquid crystals with a N,N′-bis(tropon-2-yl)piperazine core were prepared. N,N′-Bis(tropon-2-yl)piperazine derivatives (1) had a smectic C phase with lower thermal stabilities than the corresponding benzenoid derivatives (2), which had a smectic B phase. A single crystal of 1d had distinct layer…
Austempered ductile iron (ADI) has lower density and higher damping capacity compared to steel. To evaluate the applicability of ADI to electric car driving gears, rolling contact fatigue (RCF) tests were carried out using two rollers of shot peened ADI for lower rotating velocity roller mated with case hardened alloy…
An asymptotic solution is found by the method of inner and outer approximations for the singularly perturbed equations governing the deformation of twines and fibres that are under tension where the angles at the boundaries are fixed. This solutions is shown to be accurate to O(∊2 ) where ∊2 = EI/l 2 f, EI is the bend…
Currently there are no models to predict the thickness or the bondline thickness (BLT) of particle laden polymeric thermal interface materials (TIM) for parameters such as particle volume fraction and pressure. TIMs are used to reduce the thermal resistance. Typically this is achieved by increasing the thermal conduct…
Abstract New polyurethane materials were obtained after chemical modification of a commercial thermoplastic polyurethane (TPU) using diisocyanates and diols or diamines. The reaction can be easily processed by the well‐known calendering technique often used by the rubber industry. It leads to a remarkable improvement…
This report details studies conducted by Transportation Technology Center, Inc. (TTCI), a subsidiary of the Association of American Railroads (AAR), to determine the causes and behavior of shattered rim defects in wheels. Shattered rim defects are the result of large fatigue cracks that propagate roughly parallel to t…
Este trabalho avaliou as potencialidades de emprego do resíduo caulinítico das indústrias de beneficiamento do caulim como matériaprima na produção de uma metacaulinita altamente reativa. As características mineralógicas do resíduo e da metacaulinita foram analisadas pela difratometria de raios X e pela análise térmic…
The seminal investigation of the explosive fragmentation of steel cylindrical shells by N. F. Mott in the early 1940’s led to an elegant statistics‐based theory of dynamic fragmentation (Mott, 1947). Experiments in which rapidly expanded metal rings undergo dynamic fragmentation provide ideal data for testing the frag…
Contributors. Acknowledgments. Preface. Glossary. Compound Characterization. Thermodynamics. Kinetics. Equilibrium Constants. Partition Coefficient. Solubility. Aqueous Solubility of Weak Acids and Bases. Solution Stability. Instrumentation. Equilibria: Experimental Procedures and Examples. Partitioning: Experimental…