Materials Literature
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The anodic electropolymerisation of long-chain 3-substituted pyrroles and thiophenes gives highly conducting polymeric materials, some of which are soluble in common organic solvents in the conducting state.
The switching process of a surface stabilized ferroelectric liquid crystal cell is considered on the basis of disclination dynamics for various cell thicknesses. In this report we first summarize the surface stabilized ferroelectric liquid crystal states and their boundaries, and then examine the switching characteris…
A series of thermotropic poly(1,4-phenylene-2,5-di-n-alkoxy terephthalate)s with the length of the n-alkoxy side chains being varied between n = 2 and n = 18 carbon atoms has been examined by optical microscopy, x-ray diffraction and DSC. All members of this series have a rigid backbone with attached flexible side cha…
摘要 用x 射线粉晶衍射方法(XRD ) 研究了不同温度下脱水的蒙脱石样品, 发现经一定程度的脱水蒙脱石(00l )特征衍射会消失, 在一定条件下又可再现.讨论了其结晶学意义及可能的相变过程. Abstract Montmorillonite samples treated at different temperatures had been studied by XRD. The (00l) reflections of some samples disappeared, and reappeared under some conditions. The crystallographic significance and the…
Abstract A difference between surface and bulk morphologies of extruded low density polyethylene (LDPE) has been observed through measurement of the contact angle of glycerol on both exterior and interior surfaces of the extrudate. The sessile drop contact angle on the exterior surface of LDPE rods prepared in a Brabe…
Corrosion resistance is an important characteristic of many types of metallic and inorganic coating systems. Corrosion resistance of coatings usually involves appearance maintenance as well as protection from structural damage. Corrosion tests have been an important approach for evaluating the type and extent of damag…
The dense wustite plates containing Al2O3 or Al2O3-CaO have been reduced isothermally in H2 gas in the temperature range from 670 to 930°C. In the case that 0.5%Al2O3 are added, all of the added Al2O3 are dissolved in FeO phase. This dissolved Al2O3 promotes the formation of dense iron covering the FeO surface and slo…
Solidification crack susceptibility in weld metal of SUS329J2L steel of which ferrite content was varied in the range of about 0 to 100% was evaluated by Trans-Varestraint cracking test. The susceptibility was partly confirmed by self-restraint cracking test. Microsegregation of such detrimental impurities as P and S…
A fast algorithm for the ray tracing of an ensemble of interacting charged particles in drift space has been developed for a fast Monte Carlo simulation program. It is based on a decomposition of the full interaction into a sum of two particle effects, which are estimated by means of analytical results. It is demonstr…
SummaryThe alkaline etching of aluminium extrusions has a strong influence on their appearance after anodizing. Both the etching conditions and the metal play a role in the development of the etched finish. Work has been carried out to show how the metal composition and structure influence the etching process, with pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear isocyanide complexes of iridium(I). Synthesis, structure, and hydrogen reactivity of [Ir2(.mu.-CNR)(CNR)4(PMe2CH2PMe2)2][PF6]2 (R = 2,6-Me2C6H3, tert-C4H9)Jianxin Wu, Mark K. Reinking, Phillip E. Fanwick, and Clifford P. KubiakCite this: Inorg. Chem. 1987, 26, 2, 2…
The crevice corrosion resistance of Inconel alloy 625 has been investigated as a function of its niobium content. A technique used primarily for mathematical modelling of crevice corrosion in chloride media has been used to compare the probable resistances to this type of corrosion. It has been shown that the level of…
Abstract The kinetics of the chlorination of acetic acid (HAc) to monochloroacetic acid (MCA) and the physical solubility of chlorine in HAc and its mixtures with MCA were investigated in a laboratory scale semibatch reactor. The temperature dependence of the Henry's constant was determined from solubility data obtain…
Author: Schuh, Harald et al.; Genre: Book; Finally published : 1987; Keywords: Zugl.: Bonn, Univ., Diss., 1986; Title: Die Radiointerferometrie auf langen Basen zur Bestimmung von Punktverschiebungen und Erdrotationsparametern
Cracking behavior has been investigated through successive observations on the surfaces of five steels, an alpha brass, an age-hardened Al-alloy and a pure titanium, with particular emphasis on the relation between the crack initiation process and the notch sensitivity in fatigue.Two types of crack initiation process…
The characterization of CO–Rh species which are formed on Rh-Y zeolite during exposure to CO has been carried out using the techniques of temperature-programmed description (t.p.d.) and infared spectroscopy (i.r.). The formation of three kinds of CO–Rh species was observed. The first is characterized by a t.p.d. peak…
ABSTRACT The velocities of freely falling water drops released from various heights in still air were measured using two different techniques at an elevation of 1570 m (5150 ft) above sea level. An electrostatic technique was used to measure the time for an electrically charged water drop to pass through two metal rin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExpansion of the molybdenum coordination sphere in dinuclear tetrasulfur-bridged complexes with the Cp2Mo2S4 coreL. L. Wright, R. C. Haltiwanger, J. Noordik, and M. Rakowski DuBoisCite this: J. Am. Chem. Soc. 1987, 109, 1, 282–283Publication Date (Print):January 1, 1987Publi…
The principles that control the reactions occurring during the formation of metallic diffusion coatings for the protection of iron and steel are reviewed. Thermodynamic principles are used to examine the reaction mechanisms of coating formation, and are related to the composition and structure of the coatings formed.…
Abstract The influence of water and oxygen concentration on stress corrosion cracking of steels in liquid ammonia. Vapor phase cracking in water‐inhibited ammonia storage spheres is also discussed.