Materials Literature
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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…
The Korea Atomic Energy Research Institute (KAERI) and some foreign laboratories have carried out six examinations of pulled tubes from Korean nuclear power plants, since the first commercial operation of Kori Unit 1 in 1978. A total of 15 tubes were extracted that exhibited different types of failures such as pitting…
Summary In this paper, we extend to three fluid phases a prior finite-element study of hydraulic conductance of two-phase creeping flow in angular capillaries. Previously, we obtained analytic expressions for the hydraulic conductance of water in corner filaments. Here, we present the results of a large numerical stud…
We have studied the pinning of magnetic domain walls on a simplified model of the cell structure of Sm(Co,Fe,Cu,Zr)/sub z/ precipitation hardened magnets. The pinning field strongly depends on the thickness of the intercellular phase if it is smaller than the domain wall width. Its maximum value has been verified with…
The basic mechanisms of crystallisation in polymers and copolymers are reviewed and compared with those of other classes of materials. It is shown that, with one possible exception, polymers generally crystallise by secondary nucleation, like other covalent materials. In the case of polymers, however, the behaviour is…
Abstract Because of very different heating rates in hot‐tool and vibration welding, and the higher weld pressures used in vibration welding inducing more squeeze flow, the weld zones in these two processes see very different flows and cooling rates, resulting in different morphologies. The weld morphologies of bisphen…
The dominant components of the χ(2)(-ω; ω, 0) nonlinear quadratic susceptibility tensor of a poled polymer-based nonlinear organic thin film are measured independently with a Fabry–Pérot interferometric technique. Electro-optic dispersion is obtained from visible wavelengths up to 1.550 μm leading to a wavelength-inde…
The magnetic domain structure and properties of sintered Sm(Co/sub bal/Cu/sub 0.07/Fe/sub 0.22/Zr/sub 0.04/)/sub 7.4/ have been investigated, at different aging stages and applied fields. A low coercivity (0.2-2 kOe) developed during isothermal aging at 800/spl deg/C for 16 h, while a maximum coercivity of 31 kOe was…