Materials Literature
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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…
The zeroth-order cross-reflection coefficients of a surface-relief grating are shown to be equal from experimental evidence and numerical evidence by use of rigorous coupled-wave analysis simulations. This result is valid for any range of grating parameters as well as for anisotropic media that have the optic axis in…
The kinetics of polarization switching in ferroelectric crystals is studied using the concept of fractals. The switching process is found to be multifractal.
Abstract Ionomeric polyblends of the zinc salt of maleated EPDM rubber (Zn‐mEPDM) and the zinc salt of maleated polypropylene (Zn‐mPP) in the composition range from 90/10 to 60/40 wt% behave as ionic thermoplastic elastomers (ITPE), which show synergism in physical properties. The ionomeric polyblend shows higher phys…
A time-domain analysis of quasi-static magnetic fields around nonperfectly conductive shields is performed by a numerical procedure based on the nodal-based finite element method (FEM). Eliminating the shield region from the computational domain, a new boundary is generated where impedance network boundary conditions…
The peroxo‐oxalate complexation method is a method that can be used for the preparation of doped barium titanate. In this paper we focus on BaTi 0.91 Zr 0.09 O 3 , which can be used for discharge capacitors in lamp starters. The preparation method described here is based on the complexation and subsequent precipitatio…
Abstract An unprecedented layered (2-D) honeycomb supramolecular structure comprised of μ4-σ-dimerized 7,7,8,8-tetracyano-p-quinodimethane dianion bridging four S = 2 substituted Mn(III)porphyrins as demonstrated with meso-tetrakis(2,4,6-trimethylphenyl)porphyrinato has been structural characterized.
Optically isotropic cubic mesophases, which are commonly exhibited by lyotropic materials, have been observed in a few thermotropic liquid crystalline systems also. Although the first thermotropic cubic mesophase was reported about 40 years ago, its existence in diverse systems is only a recent finding. Moreover, the…