Materials Literature
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Quantitative analyses by crossed immunoelectrophoresis were carried out on 31 eyes of 26 cataract patients, age 4-80 years, to detect age changes in the human aqueous humor especially in the following aqueous humor proteins: prealbumin, albumin, alpha 1-acid glycoprotein and transferrin. There was a significant correl…
Abstract The mechanical anisotropy of oriented PVDF sheet is examined using a variety of experimental techniques. The mechanical behavior is similar to that observed previously for low‐density polyethylene and nylon and consistent with a parallel lamellar crystalline structure. The s 31 compliance is reduced in magnit…
AM1 calculations are reported which demonstrate that the classical hydrogen migration in porphyrin occurs via a two-step mechanism, not a synchronous-concerted mechanism as has been previously supposed; the implications of this mechanism on tautomerization dynamics are discussed.
Phase transformations and the resultant microstructures of partially-stabilized zirconia (PSZ) are briefly reviewed with a special interest in the nature of phase transformations. The martensitic tetragonal-to-monoclinic transformation, which plays a principal role in toughening of PSZ, accompanies lattice defects suc…
Recent ideas on the mechanisms controlling the initial stages of plastic flow at cracks in intrinsically brittle materials, at the ductile-brittle transition, are reviewed. New experiments on precracked specimens of Si are reported, which confirm earlier work that the ductile-brittle transition is controlled by disloc…
The driving-force-generating principle of an actuator made of shape memory alloy (SMA) is based on the thermal elastic martensitic transformation, a kind of elastic phenomenon. As a result, conventional SMA actuators which use a circular pulley have tended to exhibit undesirable characteristics such as the maximum gen…
Some aspects of the testing of polymer blends by Dynamic Mechanical Thermal Analysis (DMTA) are reported. Compatibility of the blend components, which has a major influence on physical properties, can be well characterised. Data are presented for various types of blends, both compatible and incompatible. Plasticisatio…
The “linearizing method” is a method used to predict the stress/strain relation of fabrics under biaxial extension in the warp and weft directions. The stress/strain relation is firstly linearized by using a transformed strain such as ei = ∊i n where ei is the transformed strain (i =1, 2), ∊i the strain, and n a const…
Hydrogenolysis of chloroethene (vinyl chloride, VC) has been investigated in a tubular-flow reactor at atmospheric pressure between 872–1085 K. Ethene, ethyne, and HCl are major initial products of reaction. Hydrogen-atom addition to the substituted end of VC yields C2H4 after loss of a chlorine atom from the radical…
The present paper is a brief overview of aspects of the damaging effects of radiation on nuclear plant components manufactured from organic polymers. The paper briefly mentions some general nuclear plant applications of polymers, describes how the properties of polymers are affected by radiation, outlines some of the…
Минимальный хаос, стохастическая паутина и структуры с симметрией типа "квазикристалл", Заславский Г.М., Сагдеев Р.З., Усиков Д.А., Черников А.А.
The thermal decomposition of pyrite has been studied by combining thermogravimetric (t.g.) and microscopic techniques. Predictor–corrector methods, coupled with screen graphics, were used to solve the differential equations representing kinetic models of t.g. data. Kinetic conclusions from t.g. data are in good agreem…
Numerical simulation of a wide range of physical phenomena typically involves enormous amounts of computation and, for scores of practical problems, these simulations cannot be carried out even on today's fastest supercomputers. The economic and scientific importance of many of these problems is driving the explosive…
Expressions are presented for the calculation of the magnetic field components due to toroidal current-carrying conductors of rectangular cross section, with angular length equal to 2 pi radians and constant current density. The expressions contain complete elliptic integrals of orders I and II. The elliptic integral…
The pentanuclear cluster [Au3Cu2(C2Ph)6]– was obtained from the reaction between [{Au(C2Ph)}n] and a mixture of [Au(C2Ph)2]– and [{Cu(C2Ph)}n]. Its structure is described. The same cluster has been synthesized in a stepwise manner starting with [Au(C2Ph)2]– through the binuclear complex [Au2(C2Ph)3]– and the trinuclea…
The transmittance spectra of twisted states of surface stabilized ferroelectric liquid crystal cells were measured under a polarizing optical microscope. It was found that the two twisted states give different spectra, as expected by an apparent color difference. There were two cases; in one case the two spectra inter…
On etudie la microstructure, les proprietes mecaniques et les performances comme outils de coupe de composites Al 2 O 3 −TiC presses a chaud isostatiquement et uniaxialement
Abstract Synthese und Eigenschaften von Metall(II)‐ und/oder Metall(III)‐bis Chelaten des 1,3‐Dithiol‐2‐on‐4,5‐dithiolats (dmid) vom Typ A n [M(dmid) 2 ] (A = Bu 4 N + , Ph 4 As + ; M = Zn, Cd, Hg, Cu, Ni, Pd, Au, Fe; n = 1, 2) werden beschrieben. Anhand der IR‐, 13 C‐NMR‐, EPR‐Spektren und Cyclovoltammogramme dieser…
Abstract Graft polymerization of acrylamide onto rice starch was investigated under different conditions using potassium persulphate, benzoyl peroxide or potassium permanganate as initiator. This has led to establishment of the most appropriate grafting conditions for each of these initiators. Under these conditions g…
Over the past few years, a number of techniques have evolved for detecting discharges in the insulation systems of electrical machines by measuring the discharge currents flowing at the machine terminals. The propagation of these currents through the winding, from the discharge site to the terminals, is influenced by…