Materials Literature
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Abstract Newly designed hydrogen-bonded liquid crystals having the simplest mesogenic structure have been obtained by self-assembly of 4-alkoxybenzoic acid and 4-alkylpyridine. The complexes show nematic phases near room temperature. The nematic phase is broadened by mixing of several complexes within a homologous ser…
A series of binary tellurite-phosphate glasses in the form [TeO2]0.81[P2O5]0.19 doped with different rare-earth oxides were prepared. The rare-earth oxides were: La2O3, CeO2, Pr2O3, Nd2O3, Sm2O3, and Yb2O3. The optical absorption coefficient and infrared spectra were measured in the ranges 200–900 nm and 200–1000 cm−1…
Abstract Hardfacing is a form of surfacing that is applied for the purpose of reducing wear, abrasion, impact, erosion, galling, or cavitation. This article describes the deposition of hardfacing alloys by oxyfuel welding, various arc welding methods, laser welding, and thermal spray processes. It discusses the catego…
An objective screening technique for fabric handle is presented. This method is based on the use of a simple device fitted to a tensile testing machine, and measures the force generated while passing a fabric specimen through a ring. The method proved capable of detecting differences in fabric handle between comparabl…
The consequences of the inherent high variability of life data are described, and some objective methods to aid in the design and analysis of aging experiments are reviewed. It is argued that before accelerated aging tests and proposed aging models can acquire credibility with high-voltage (HV) equipment designers, te…
Fine-particle rare-earth-metal zirconates, Ln2Zr2O7, where Ln = La, Ce, Pr, Nd, Sm, Gd and Dy having the pyrochlore structure have been prepared using a novel combustion process. The process employs aqueous solutions of the corresponding rare-earth-metal nitrate, zirconium nitrate and carbohydrazide/urea in the requir…
Surface models of monoclinic and tetragonal zirconia are presented. They are derived from the respective lattice structures of both modifications. In contrast to previous investigations structural deviations of both phases from the ideal CaF2 structure are taken into account. The existence of trigonally and tetrahedra…
The accelerated synthesis of regular dendritic poly (ether-urethane) macromolecules through growth of two generations in a single synthetic operation has been explored. This procedure requires the use of two AB2 monomers such as 3,5-diisocyanatobenzyl chloride and 3.5-dihydroxybenzyl alcohol that can react pairwise in…
Mathematical equations are derived for the transient electric field in insulation media with permittivity and resistivity during boundary excitation due to changing from one steady state to another, such as a polarity reversal voltage imposed on the insulation of HVDC apparatus. The equations are solved by the finite…
Cobalt(II) phthatocyaninetetrasulfonate [Co(pcts)]4– intercalated into a MgsAl2.5-layered double hydroxide (LDH) sxhibited greatly enhanced catalytic stability compared to the homogeneous catalyst for the autoxidation of 2,6-di-tert-butylphenol to the corresponding diphenoquine at 35 ± 2 °C; under homogeneous reaction…
Efforts to improve the wear properties of sintered high speed steels have made use of the simultaneous addition of hard ceramic particles (TiC or NbC) alongside particles which might act as a solid lubricant (MnS or CaF 2 ). Preliminary investigations carried out to study interactions between such particles and a sint…
The transition of Fe2+ to Fe3+ in Fricke solution after irradiation results in a change of NMR proton relaxation times in agarose gels which can be used for the dosimetry of ionizing radiation. The main advantage of this system is the possibility of observing dose distributions in 3 dimensions in a medium which is sup…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and degradation of commercial poly(vinyl chloride) obtained at different temperaturesMikael Rogestedt and Thomas HjertbergCite this: Macromolecules 1993, 26, 1, 60–64Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published ini…
Powder compacts of alkoxide‐derived fine silica powders were consolidated into a highly dense and uniform structure by ultra‐high‐pressure cold isostatic pressing of granules with controlled structure. The diameters of spherical and nearly monosized amorphous silica particles, prepared from metal alkoxide, were succes…
The pulse height distribution (PHD) functions of partial discharges (PDs) generated by AC voltage in air are investigated. The electrode systems used allow the investigation of single-source PDs and/or multiple-source discharges. Because voltage and the electrode configuration alter the PHD functions of even a single…
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Abstract Trichloroethylene, tetrachloroethylene, 1,1,1-trichloroethane, chloroform and carbon tetrachloride in dilute aqueous solutions were rapidly decomposed to chloride anions, hydrogen, carbon monoxide and carbon dioxide by ultrasonic irradiation.
Magnetic materials capable of producing strains greater than 10 -3 have received con siderable attention over the last few years. This is partly due to recent interest in fields such as de formable surfaces, active vibration control, and precision machining, where large forces and small displacements are required, and…
Four types of transparent electrically conductive filters commonly used for a variety of applications are (1) a free-standing conducting inductive mesh, (2) a substrate coated with a conducting inductive mesh, (3) a conducting substrate, and (4) a substrate coated with a continuous conducting coating. Each can be desi…
In order to search for a chitosan with low crystallinity, partially N-deacetylated chitins (PDC) and partially N-acetylated chitosans (PAC) with a low degree of N-acetylation (DAc) were examined by X-ray powder diffraction measurements. Three PDC samples, having less than 30% DAc and prepared by solid-state deacetylat…