Materials Literature
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The aim of this paper is to compare visco-plastic behavior of lead and a lead alloy over a wide range of temperature and strain rate. Compression test data have been obtained on stress variation with strain. Quasi-static compression tests were carried out on a MTS facility, while dynamic test results were obtained usi…
Abstract Stable protected 3‐triisopropylsilylethynylpyrrole, 4b , was prepared in the yield 73% by first observed selective deprotection of double protected 1‐triisopropylsilyl‐3‐triisopropylsilylethynylpyrrole, 3b , which was obtained in the yield 44%. This deprotection in preference proceeds at the pyrrole nitrogen…
Composite materials are used in applications that require protection against high velocity impacts by fragment simulating projectiles. In this work, the ballistic performance of two commercially available materials against a fragment simulating projectile (FSP) is studied. The materials used were an aramid fiber with…
The Varying Temperature Irradiation Experiment in the High Flux Isotope Reactor (HFIR) was carried out in the framework of the Japan-USA fusion cooperation program (JUPITER). The objective of the experiment is to investigate the performance of fusion structural materials subject to temperature variation during operati…
Mixed lead chloride oxalate, Pb 2 Cl 2 (C 2 O 4 ), has been obtained in a polycrystalline form in the course of a study on precursors of nanocrystalline PZT-type oxides. Its crystal structure has been solved ab initio from powder diffraction data collected using a monochromatic radiation from a conventional X-ray sour…
Approaches to the spatial harmonic characterization of the field due to a symmetrically shielded permanent bar magnet are presented. At first, exact spherical harmonic coefficients are obtained for a given unshielded magnet and comparisons are made with the coefficients of unshielded numerical models. In the calibrati…
An experiment analyzing the kinetics of dissolution of a solid with cylindrical geometry in water is presented. The dissolution process is followed by measuring the solid mass and its size parameters (thickness and diameter) as a function of time. It is verified that the dissolution rate follows the Nernst model. Data…
The N-doped TiOx films, coated on glass substrates, were prepared by DC reactive magnetron sputtering using Ti metal target in a mixture of Ar, O2 and N2. The dependence of the films composition on ratio of N2 partial pressure to total pressure was investigated using X-ray photoelectron spectroscopy (XPS). The XPS res…
L Kolesnikova, W Slenczka, H-R Brodt, H-D Klenk, S Becker; Electron microscopy in diagnostics of SARS case, Microscopy and Microanalysis, Volume 9, Issue S
Abstract We describe the syntheses of Boc‐protected amino acids bearing the chromophores pyromellitic diimide, naphthalene diimide, and pyrene in their side chains, as well as nucleo amino acids with the artificial purines 7‐carbaguanine, 7‐carbaadenine, isoadenine, and 7‐carbaisoadenine covalently linked to the alany…
We studied a new method of preparing a Nd-Fe-B-bonded magnets by compacting and rolling or stamping, and applications to small dc motors were examined. Consequently, we developed new preparation processes of Nd-Fe-B-bonded magnets using materials other than Nd-Fe-B melt-spun powder. It was found that applications of t…
Abstract Three kinds of steels were studied using electrically connected hanging specimen in the corrosion simulation device and offshore long scale hanging specimen. The experimental results obtained by the two methods show that the device can better reflect the offshore corrosion environment. A Ni‐Cu‐P steel specime…
Vladislav Krzyzanek, Rudolf Reichelt; MONCA: A New MATLAB Package for Monte Carlo Simulation of Electron Scattering in Thin Specimens in the Energy Range 1
Uniform attachment of enzymes to solid surfaces is essential in the development of bio and optical sensor devices. Immobilization by adsorption according to hydrophilic or hydrophobic nature is dependent on the charges and defects of the support surfaces. Sol-gel SiO2 densified glass surfaces, frequently used as suppo…
Abstract The effects of ZrO 2 addition with various particle sizes (1, 3, and 56 μm) and various amounts (0, 1, 3, 5, 7, 9 wt. %) on structure, oxygen permeation, and stability of SrCo 0.4 Fe 0.6 O 3−δ (SCF) were investigated. XRD and EDX analysis revealed that the dissolution of Zr cation into the B site of SCF phase…
Poly(-hydroxybutyrate), PHB is a bacterial polyester known for its excellent bone compatibility, however, the material lacks blood and tissue compatibility. Poly(ethylene glycol), PEG,-modulated fermentation of Alcaligenes latus and Azotobacter vinelandii UWD was employed to yield copolymers consisting of PHB and PEG…
The coercivity mechanism of highly textured highly coercive Nd-Fe-B films has been investigated in relation to their microstructures. With increasing deposition temperature, the microstructure of the films changes from a rounded to rectangular grain shape with no significant change in the grain size. At the same time,…
A new aromatic diamine monomer, N,N′-bis(4-aminophenyl)-N,N′-diphenyl-4,4′-biphenyldiamine, was first synthesized in two steps by the condensation of N,N′-diphenyl-4,4′-biphenyldiamine with 4-fluoronitrobenzene, followed by reduction. New triphenylamine-containing aromatic polyimides having inherent viscosities of 0.6…
TiO2-doped 30CaO–30Al2O3–40B2O3 glasses have been prepared by the melt quenching method over a wide range of composition (TiO2 = 5, 10, 15, and 20 mol%). The longitudinal velocity and attenuation of ultrasonic waves were measured in these glasses at room temperature using the pulse-echo technique. The acoustic impedan…
The SrFe/sub 12/O/sub 19/ powders prepared by a sol-gel method were annealed at temperatures ranging from 400/spl deg/C to 900/spl deg/C for 3 h and 6 h in air. Magnetic and structural properties of the powders were characterized with a vibrating sample magnetometer (VSM), X-ray diffractometer (XRD), scanning electron…