Materials Literature
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The unique memory property of thermodynamic wire is only partially understood. It is believed to result from the wire's inherent capability to markedly alter its atomic bonding forces as a function of temperature. This shape recovery phenomenon may be the result of a transition in crystal structure that occurs by defo…
The morphotropic phase boundary (MPB) in PbZr x Ti1-x O3 (PZT) powders prepared by a novel semi-wet route is shown to be around x = 0.525. XRD evidence is presented for the first time to demonstrate the coexistence of the tetragonal (T) and rhombohedral (R) phases in such powders over a very narrow composition range o…
Examples of mesogenic 1,4,8,11,15,18,22,25-octaalkylphthalocyanines and their zinc analogues, series 1, have been deposited as spin-coated films onto glass slides. Thermally induced molecular reorganisations within the films have been investigated by optical spectroscopy. Temperatures of transitions observed in the fi…
Poly morphs are attracting a great deal of attention in present-day pharmaceutical literature. Most often the polymorphic forms are distinguished by way of solubility (or dissolution rates), DSC and X-ray diffraction. The writing to follow deals with a polymorphic pair which is virtually indistinguishable except by me…
The interaction between partial discharge (PD) phenomena occurring in insulating systems is investigated in this paper. In particular, the recognition of two PD phenomena simultaneously active is approached by means of a five-parameter additive Weibull distribution. Various shapes of the PD height distribution, obtain…
Article Planktonic Diatoms from the Gulf of California and Coasts off Baja California: Species of the Genus Thalassiosira was published on January 1, 1995 in the journal Botanica Marina (volume 38, issue 1-6).
The first optical resolution of a photochromic fulgide is performed for a thermally irreversible indolylfulgide to give a pair of enantiomers of helical chirality, and their optical properties and photochemical and thermal enantiotopomerization processes are investigated.
The effect of titanium dioxide and polydextrose on film adhesion to microcrystalline cellulose tablet surface and mechanical properties of aqueous-based hydroxypropyl methylcellulose free films were evaluated using a Lloyd LRX materials testing machine. The free films and the films applied to tablets were prepared by…
A series of Na2MoO4/SiO2 catalysts with various loadings of Na2MoO4 have been characterized using secondary ion mass spectrometry (SIMS), X-ray photoelectron spectroscopy (XPS), FTIR and X-ray diffraction (XRD). Their catalytic activity for methane oxidative coupling (MOC) has been tested. The results revealed some ty…
The behavior of large induction motors during transient as well as steady state running conditions is of significant interest to the power industry. A variety of analytical predictive tools are employed to aid the design and predict their operation under transient and steady state conditions. This paper presents a str…
Broadband dielectric spectroscopy in the frequency range from 10−4 to 109Hz was employed to study the molecular dynamics of various triphenylene and benzene derivatives in their isotropic and liquid crystalline phases. For all derivatives, two relaxation processes were detected in their columnar mesophases. The β-proc…
Molecular trees, also called dendrimers, arborols, cauliflowers, cascades or hyperbranched molecules, have been synthesized since their first observation in 1978 by divergent, convergent or combined methods, with various functions on the branches. The potential applications of these nanoscopic molecules are in the fie…
Silicon nitride sintered bodies composed of finegrained α-Si3N4 and β′-sialon were fabricated by the gas-pressing sintering method. The silicon nitride sintered body showed a very high strength of about 2.0 GPa at room temperature, shock resistance of about 20kJ·m-2 (Charpy impact value) and 3-point bending fatigue li…
The paper outlines a method for comparing the tightness of two woven fabrics. The tightness of a woven fabric is determined with reference to the nearest maximum-sett fabric to the given fabric. The purpose is not to categorise woven fabrics in terms of their tightness but to enable fabrics to be designed with referen…
This paper describes the parameters recommended for rational design of amphiphile-based drug carriers. The main advantage of a carrier is its ability to modify the pharmacokinetics and biodistribution of the drug, so that the drug level at the target is sufficient for therapeutic benefits. Three parameters are describ…
Chicken mitochondrial and Escherichia coli aspartate aminotransferases K258H, in which the active site lysine residue has been exchanged for a histidine residue, retain partial catalytic competence [Ziak et al. (1993) Eur. J. Biochem. 211, 475-484]. Mutant PLP and PMP holoenzymes and the complexes of the latter (E. co…
Novel nis(l,3-dithiole) donors ( 4) and ( 5) containing thiophene spacer units have been prepared.The cyclic voltammograms indicate that 4 and 5 are oxidized to mcation radicals and terracations, respectively, and on-site Coulombic repulsion in the dication state is reduced.An electroactive polymer was formed from 4c.…
Abstract A structural study was carried out on poly(α‐butyl β‐ L ‐aspartate), which is a stereoregular nylon‐3 derivative with an alkoxycarbonyl group attached to the β‐carbon of the main‐chain repeating unit. Two crystal forms, namely hexagonal and tetragonal, made of 13/4 and 4/1 helices, respectively, and bearing a…
Amorphous, mesoporous titania–silica aerogels with high Ti dispersion, synthesised using a sol–gel process followed by semicontinuous extraction with supercritical CO2, are shown to be excellent catalysts for the epoxidation of bulky cyclic olefins.
A considerable amount of work has been carried out on stress relaxation phenomenon in polymers, particularly, polymeric fibres. However, there is almost no published work available on a newly observed phenomenon, known as ‘Inverse Relaxation’. The theoretical work on stress relaxation carried out until now has been ba…