Materials Literature
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Several ductile Iron samples with various kinds of matrix were subjected to fracture toughness testing in a condition that specimens were in contact with water at the time of testing.A considerable reduction in fracture toughness caused by contact with water was found in the case of the samples with an austempered mat…
Abstract Three steps in complex chemorheological studies are necessary for complete rheological characterization of filled rubbers during cross-linking reaction. They include: (i) kinetic studies of cross-linking reaction, (ii) rheological studies of green rubber compounds, and (iii) correlation between the rheologica…
Anisotropic strain gradient elasticity theory is applied to the solution of a mode III crack in a functionally graded material (FGM). The theory includes both volumetric and surface energy terms, and a particular form of the moduli variation. The crack boundary value problem is solved by means of Fourier transform and…
symmetry are calculated by restricted (RHF) and unrestricted (UHF) Hartree-Fock theory; Møller-Plesset perturbation theory (MPn); coupled-cluster theory with singles, doubles, and a perturbational treatment for connected triples [CCSD(T)]; Brueckner doubles with a perturbational treatment for connected triples [BD(T)]…
Abstract Backscattered electron spectroscopy offers detailed information for multilayer and subsurface‐layer materials with distinct Z contrast: It can be used for the validation of Monte Carlo calculations, to obtain depth selective electron microtomographic images, and to determine the thickness of ultra thin films…
Topical courses devoted to specific techniques or subjects, such as x-ray techniques or clay mineralogy, are often difficult to fit into an undergraduate geology curriculum. These courses, if designed appropriately, can introduce students to research techniques and can provide them with a way to apply the principles t…
Carbon atoms condense to many useful nanostructures under suitable environmental conditions in presence of some specific catalysts. Fullerene molecules and carbon nanotubes are zero and one dimensional shells made out of monatomic layer thin graphene sheet. Due to curvature involved in otherwise graphite lattices, mix…
A Preisach based magnetization model is presented to work specifically on highly magnetostrictive materials. The model accounts for the additional anisotropy introduced when a prestress is used to activate the high strain, by using a bimodal structure. The necessity of strain feedback to deal with the magneto-mechanic…
It is shown that the small-angle scattering of X-rays or neutrons by dislocations within a deformed metal, which are partially ordered into wall-like structures, is characterized by several factors. Principally these are associated with: (i) a single dislocation or dipole; (ii) the dislocation configuration in the pla…
The standard Gibbs energies of formation of IrO 2 , CaIrO 3 , Ca 2 IrO 4 and Ca 4 IrO 6 have been measured in the temperature range 940–1350 K using solid‐state cells with ( Y 2 O 3 ) ZrO 2 as the electrolyte and pure oxygen gas at a pressure of 0.1 MPa as the reference electrode. For the design of appropriate working…
With the rapid development of high-frequency magnetic components, it is important to know the distributions of the electrical and magnetic fields in the ferrimagnetic cores. In this paper, an improved model for analyzing the distributions of electrical and magnetic fields in a toroidal core is given. It supplies the b…
The influence of confined geometry on the smectic A-smectic C* phase transition in the ferroelectric liquid crystal CE8 has been analysed. Using an electro-optic response technique, the temperature dependence of elementary excitations in thin, homogeneously aligned, wedgetype cells of thickness from 0.25 to 4mum has b…
Antimony sulphoiodide (SbSI) is a semiconducting ferroelectric crystal. The SbSI possesses attractive properties, such as high pizoelectric constant, very high dielectric permittivity, and high electro-optic coefficient, but it is very difficult to grow a single crystal with bigger size. Currently, a method for synthe…
We used reflection ellipsometry and infrared absorption spectroscopy to investigate the effect of soaking rubbed polyimide films in solvents. This enabled us to clarify the influence of washing on polyimide films after rubbing, in the fabrication process of liquid crystal display devices. It was found that soaking in…
The new members of the series of 2,5-disubstituted DCNQIs, 1d (Cl/OMe), 1e (Br/OMe), 1j (Cl/I), 1k (Br/I), 1l (I/I), form conducting charge-transfer complexes with TTF (tetrathiofulvalene) which are comparable to known DCNQI/TTFs. From these DCNQIs highly conducting radical-anion salts [2-X, 5-Y-DCNQI]2M (M = Li, Na,…
An experimental approach has been used to measure the threshold stress intensity factor ( K th ) for subcritical crack growth in brittle materials using indentation cracks. The data show that K th values existed in soda‐lime‐silica and soda‐alumina‐silica glasses that were tested in a neutral aqueous environment. For…
The in-plane permeability or transmissivity of a geotextile becomes an important property when it is used in applications involving cohesive soils (clays). Because cohesive soils are relatively impermeable, the geotextile is mainly responsible for drain ing the water from the soil structure, thus releasing the pore wa…
Sodium silicate and sodium borate were tested as flame retardants on two types of paper sheet (100% rice straw pulp paper with a high silica content while the other consisted of 100% wood pulp paper). After addition of inorganic flame retardant salts (sodium silicate and sodium borate) on to the two samples of paper,…
We study the elasticity behaviour at the sol-gel transition with a percolation dynamic model via computer simulations on a square lattice. From the fluctuations in the center-of-mass motion of the percolating cluster we determine the critical behaviour of the macroscopic elastic constant of the gel phase, growing abov…
This paper is the result of an interdisciplinary research project at the Institute of Textile and Clothing Technology and the Institute of Solid Mechanics. The aim of this project is to describe and simulate the deformation behavior of flexural fabrics ( espe cially woven fabrics). For the simulation model, the shell…