Materials Literature
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Over the last several years, the International Standards Organization (ISO) has developed standards which require pneumatic impact testing on valves, regulators, and other oxygen components used in Europe in medical, industrial, and commercial applications. The several standards involved all reference a test system de…
A prototype of integrated micropermeameter has been achieved, using the batch process on silicon wafers developed for the fabrication of magnetic heads for helical scan recorders. Measuring the inductance of the integrated solenoids as a function of the frequency gives information on the effective permeability of the…
A Mn-Zn ferrite with fine grain size and low core loss at 0.5 to 2 MHz was developed, and a conductor-embedded-type planar transformer was made using the developed ferrite. The Bm/spl middot/f value in the loss level of 400 kW m/sup -3/ of the developed ferrite at f=1 MHz is 2.2 times larger than that of the commercia…
The phosphorescence decays of β-cyclodextrin (β-CD) complexes of xanthione (XT) and 4H-1-benzopyran-4-thione (BPT) show that self-quenching and oxygen quenching are not important in such complexes, and that the existence of bimodal inclusion in solid complexes can be identified using the width of the distribution para…
The protective performance against molten metal has commonly been measured for the outer layers of garments. Heavy-weight wool melton offers the best overall protection against molten metal owing to its metal-shedding property coupled with high thermal insulation. Reflective aluminized materials, which also protect ag…
The dielectric properties of the NaX zeolite (Si/Al=1.3) have been measured after different thermal treatments in the temperature range 100–400°C. The frequency domain was varied from 10 to 106 Hz, the measuring temperature being in the range 80–150°C. Independent of the outgassing temperature (i.e. the number of wate…
3b, 19a-dihydroxyurs-12-ene-28oic acid, caffeic acid, and chlorgenic were isolated from the fruits and 3b, 19a-hydroxyurs-12-ene-28-oic acid, ferulic acid and p-coumaric acid from the roots of Kigelia pinnata. Key Words: Kigelia pinnata, Bignoniaceae, Triterpenoids, Phenolic acids Nig. J. Nat. Prod. And Med. Vol.1 199…
Results on the effect of Mn, Sn, and Cr additions on the magnetic properties of positive magnetostrictive Fe/sub 79/Si/sub 5/B/sub 16/ amorphous glass-covered magnetic wires are presented. Magnetic measurements performed on Fe/sub 75/Si/sub 5/B/sub 16/Mn/sub 4/, Fe/sub 77/Si/sub 5/B/sub 16/Sn/sub 2/, and Fe/sub 77/Si/…
By use of X‐ray texture analysis characteristic features of phase transformations in sheets, tubes and welding seams of the Zr–2.5%Nb alloy were studied. Main attention was given to inhomogeneity of phase transformation development, connected with inhomogeneous distribution of strain hardening in grains with different…
Article Degradation and Oxidation of Cellulose in Acidic Potassium Permanganate Solutions. Kinetics and Product Analyses was published on January 1, 1997 in the journal Holzforschung (volume 51, issue 6).
Abstract Growth of spherulitic crystals of iron tartrate by controlled diffusion in sodium metasilicate gels has been described. Infrared spectroscopic, thermogravimetric and elemental analysis have been conducted to characterize the crystals. The results are interpreted and explained.
Power capacitors are widely used for regulating voltage and improving the power factor of power systems, and the type in most frequent use today are capacitors made of oil-impregnated paper film, a growing number of which will soon have been in operation in the field for 20 years. This has prompted the authors to stud…
The molecular design principle and synthetic methods of thermally irreversible and fatigue resistant photochromic diarylethenes with heterocyclic rings, such as thiophene or benzothiophene rings, are described.
The assignments of FTIR and Raman spectra of poly (vinyl alcohol) (PVOH) and four ethylene vinyl alcohol (EVOH) copolymers 72, 59, 44, and 32mole% of ethylene group, has been performed by in-situ measurements and deconvolution analysis. By comparing with the spectra of high-density polyethylene, the bands in the regio…
Abstract In adiabatic vacuum and dynamic calorimeters the temperature dependence of the heat capacity C p 0 of tetrahydro‐1,3‐oxazin‐2‐one (THO) and poly(oxy‐1,3‐propanediyliminocarbonyl) (PTHO) was studied between 5 and 500 K. The melting temperature of the monomer and the polymer, the enthalpies of melting of THO an…
To integrate irreconcilable material properties into a single component, novel engineered materials termed ‘surface composites’ have been developed. In these engineered materials, the second phase is spatially distributed in the near surface region, whereas the phase composition is linearly graded as a function of dis…
Vector hysteresis models are generally regarded as helpful tools that can be utilized in simulating multi-dimensional field-media interactions. In this paper, simulation of vector hysteresis is proposed by using a superposition of isotropic Preisach-type models. This approach gives the opportunity to fully incorporate…
XLPE power cables were introduced in Norway by Alcatel Kabel Norge AS in 1968. The standard XLPE construction sold to the Norwegian electric utilities today is an axially and radially watertight power cable construction presented in 1991. The objective of this paper is to summarize test results that show the developme…
EXAFS is used to study changes in local structure which occur on doping at the B site in two related perovskite oxides, SrSn 1-x Sb x O 3 and BaPb 1-x Bi x O 3 . In the case of the stannate, data is taken at the Sr K, Sb K and Sn K edges. A combination of near-edge XAS and EXAFS measurements show that Sb dopes into th…
The cation exchange capacity (GEC) of soil is an important criteria for assessing soil fertility beside its use in soil classification. Seven methods, namely, (1) BaCl2 - triethanolamine of BaCl2 - TEA (PH 8.2), (2) NH40Ac (PH 7.0) - leaching, (3) NH40Ac (PH 7.0) - shaking, (4) compulsive exchange method of Gillman (1…