Materials Literature
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Cover-plate materials are influencing the build-up distances and delay times of high explosive charges in contact to the barrier, loaded by shaped charge jets. Materials with strong bulging behavior give long build-up distances, as steel and ceramics, with subsonic perforation velocities in contrast to materials with…
Large linear electrooptics (the Pockels effect) of up to 17 pm/V for the wavelength 435 nm has been observed in ZnO films doped by fluorine and deposited on bare glass. In order to describe the phenomenon observed, a complex approach, including self-consistent band structure calculations together with the appropriate…
Article Electrochemical Methods for Corrosion Rate Determination Under Cathodic Polarisation Conditions - A Review Part II - AC Methods was published on April 1, 2002 in the journal Corrosion Reviews (volume 20, issue 3).
X-ray diffraction experiments have been carried out on b-eucryptite (LiAlSiO 4 ) at pressures up to 2.5 GPa and temperatures up to 1073 K in a large-volume apparatus. With room-temperature compression, we observed a phase transition to a new polymorph between 0.83 and 1.12 GPa. This transition is reversible in charact…
A brief overview is presented on the status of the synthesis of unsymmetric phthalocyanines and related compounds. The main aim of this paper is to describe the key problems and the interest in synthesizing new functionalized unsymmetric phthalocyanine systems. Some phthalocyanine homologues and analogues like subphth…
The development of theoretical models that describe the electronic structures of the porphyrins and phthalocyanines using ZINDO and DFT techniques is rapidly approaching the point where the major spectral bands over a wide energy range, for both symmetric and non–symmetric molecules can be fully accounted for. However…
Poly(vinyl alcohol)-graft-poly(ε-caprolactone) (PVA-g-PCL) was synthesized by ring-opening polymerization of ε-caprolactone with poly(vinyl alcohol) in the presence of tin(II) 2-ethylhexanoate as a catalyst in dimethyl sulfoxide. The relationship between the reaction conditions of the solution polymerization and the c…
A time-resolved infrared spectroscopic investigation was made into the thermal imidization behavior of poly(3,4′-oxydiphenylene pyromellitamic acid) precursor in a microscaled film. The CNH bend–stretch (amide-II band) was found to be the most useful tool for examining the imidization mechanism in the precursor film.…
A spent clay from the oil refining industry was recycled through an extraction process using organic solvents for removal of residual oil, followed by reactivation through heat treatment. The solvents used showed the following order in the efficiency of oil extraction: methylethylketone > acetone > petroleum ether ≅ h…
An ethylene-air laminar diffusion flame successfully provided silicon substrates of anodic aluminum oxide (AAO) template with vertically oriented well-aligned carbon nanotubes. Field emission scanning electron microscopy (SEM) showed that open-tipped carbon nanotubes consisting of tube elements with the same length an…
The phase field microelasticity theory is used to formulate a three-dimensional phase field model of proper cubic → tetragonal martensitic transformation in a polycrystalline material under an external load. The model is based on the exact solution of the elasticity problem for the material with an arbitrary phase pat…
The effect of grain size on void swelling has its origin in the intrinsic property of grain boundaries as neutral and unsaturable sinks for both vacancies and self-interstitial atoms. The phenomenon had already been investigated in the 1970s and it was demonstrated that the grain-size-dependent void swelling measured…
The efficiency of Pd-doped porous silicon (PS) as a catalytic material for hydrogen sensing is studied. Pd is deposited by an electroless process on the internal surface of porous silicon. The catalytic behavior of Pd-doped PS samples is estimated and the parameters that influence the kinetics of the chemical reaction…
Tischendorfite, ideally Pd8Hg3Se9, is a new mineral species from the Eskaborner Stollen (Eskeborn Adit) at Tilkerode, Harz Mountains, Germany. It occurs as aggregates in a carbonate matrix, together with the associated metallic minerals clausthalite, tiemannite, chrisstanleyite, stibiopalladinite and gold. It is opaqu…
Black Africans are characterized by an increased prevalence of essential hypertension (EH). Several studies have shown that extractives from many plants are useful for the management and/or control of high blood pressure (hypertension). The aim of this study was to evaluate the antihypertensive efficacy of leaf extrac…
This paper presents a theoretical analysis of the dynamics of motion of spherical metallic particles under non-uniform fields for direct-current gas-insulated switchgear (dc GIS) and for electrostatic separators/sizers (ESS). The particle equations of motion between a pair of diverging conducting plates are numericall…
Changes of crystal structures and microstructures of SiO 2 and graphite powder mixtures induced by high‐energy milling, the effect of these changes on the reactivity of reactants, and the mechanism of enhanced SiC formation have been studied using a variety of analytical instruments, including X‐ray diffractometry, sc…
An improvement was proposed for the pore-size analysis of active carbons based on low-temperature (77 K) nitrogen adsorption isotherms measured over a wide range of relative pressures (5 × 10 −7 –0.995). It was shown that the applicability of the Barrett, Joyner and Halenda (BJH) computational method based on the Kelv…
A bstract : Single‐walled carbon nanotubes (SWNTs) are ideal systems for investigating fundamental properties in one‐dimensional electronic systems and have the potential to revolutionize many aspects of nano/molecular electronics. Scanning tunneling microscopy (STM) has been used to characterize the atomic structure…
The dependence of flexural strength on crystalline phase content, residual porosity, and sintering temperature has been investigated for ceramic cores based on a mixture of fused silica and zircon. The rule of binary particle mixture, adopted for three particle sizes of fused silica, predicts a critical weight fractio…