Materials Literature
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Conventional techniques and new techniques based on digitizing instruments for making high-frequency B-versus-H loop and core-loss measurements on magnetic cores are presented and compared. Potential sources of measurement errors and their magnitudes, limitations imposed by the instrumentation, and thermal considerati…
Abstract The increasing garbage mountain is more and more recognized as an ecological threat. Space for landfills is limited and additional incineration capacities require high capital investments and pose additional envrironmental problems. In the FRG from total annual 14 million t of household waste, 700,000 t are n…
The reducibility of magnesia-supported nickel catalysts and NiO–MgO physical mixture has been studied by the temperature-programmed reduction (TPR) technique in the temperature range 373–1273 K. The influences of calcination temperature (673–1273 K), treatment time (1–48 h) and Ni loading (2.8–18 wt %) on NiO reductio…
Autogenous saphenous vein, human umbilical vein, modified bovine collagen, Dacron, and PTFE have been used as small-diameter arterial grafts with moderate success. We tested autogenous small intestine submucosa as a small-diameter arterial graft in both a carotid and femoral artery (mean ID 4.3 mm) of 18 dogs (total o…
In the present paper we consider Hamilton-Jacobi equations of the form <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper H left-parenthesis x comma u comma nabla u right-parenthesis equals 0 comma x element-of normal upper Omega"> <mml:semantics> <mml:m…
Transformation behavior in Ti50Ni50−xCux (at%) alloys has been investigated by carrying out X-ray diffraction in the temperature range between 343 and 83 K, and the following was found. In the alloys with Cu-content less than 5 at%, B2→B19′ transformation takes place. In the 7.5 at%Cu alloy, both B2→B19′ and B2→B19→B1…
A number of substituted 1,8-naphthalimides and naphthalic anhydrides have been prepared and their absorption and fluorescence properties in absolute ethanol have been determined. In the absence of an alkylamino substituent in the naphthalene ring, the compounds are colourless and weakly fluorescent. In the presence of…
The role of silicon availability on cell-cycle progression in marine diatoms was examined using flow cytometric methods. Silicon deprivation halted the progression of cells through the cell cycle with cells arresting in G1. G2 and M in 6 of 7 species examined (5 centric and 1 pennate species). The exception, Phaeodact…
Abstract
Types of Piles and Pile Materials. Piling Equipment and Installation. Soil Parameters for Pile Analysis and Design. Analysis and Design of Pile Foundations for Vertical Static Loads. Analysis and Design of Pile Foundations Under Lateral Loads. Pile Foundations Under Dynamic Loads. Analysis and Design of Pile Foundatio…
The mechanism of the sensitive and stable large Barkhausen effects of as-cast amorphous magnetostrictive wires having three composition systems was investigated using measured values of stress-induced anisotropy constant saturation magnetostriction, residual internal stress, and MH hysteresis loop squareness M/sub r//…
The structural sensitivity of the water-gas shift (WGS) reaction (CO + H2O → H2+ CO2) over metallic copper is addressed here by comparing its kinetics over the atomically clean Cu(110) surface with prior results for Cu(111). The surfaces were prepared and characterized with UHV surface analysis (AES, LEED, XPS), then…
Incoming and rebounding particle velocities were measured to within several particle diameters of the impaction surface using laser Doppler velocimetry. Impacts occurred normal to the surface and ranged from 1 m/s, near the threshold for particle bounce, to 100 m/s, well into the plastic damage regime. Monodisperse am…
Different degrees of similarity between inorganic crystal structures are defined concisely and examples are presented that illustrate their practical application. A notation giving the coordination of atoms is presented together with some basic rules for developing crystal-chemical formulae and the Bauverband descript…
Grain growth in a high‐purity ZnO and for the same ZnO with Bi 2 O 3 additions from 0.5 to 4 wt% was studied for sintering from 900° to 1400°C in air. The results are discussed and compared with previous studies in terms of the phenomenological kinetic grain growth expression: G n — G n 0 = K 0 t exp(— Q/RT ). For the…
Infrared spectra of poly(D,L-alanine), poly(L-glutamic acid), poly(L-lysine), silk fibroin, and tropomyosin have been registered for various conformations of the polypeptide chain. Assuming additivity of the main- and side-chain absorption, spectral parameters of amide I and II absorption bands corresponding to alpha-…
The powder metallurgy of titanium alloys is reviewed for both the blended elemental (BE) and prealloyed (PA) approaches. The BE technique allows low cost processing with mechanical behaviour at ingot metallurgy levels except for fatigue performance; and this latter property can be raised significantly by use of low ch…
Electrochemical impedance spectroscopy (EIS) applies well to surfaces having a high electrical or electrochemical impedance. The method is, therefore, particularly suitable for the early detection of the degradation of highly resistive protective organic coatings on metals. Initial application of electrical methods fo…
Abstract The basic principles of electrochromism have been reported and discussed using the example of WO 3 , and some other important electrochromic materials have been described which have a number of interesting technical applications. Both compounds and materials used in ECDs were discussed and the principles of d…
In the last five years, there has been a significant influx of new data in the literature on all aspects of the volumetric properties of silicate liquids. Several studies report 1 bar density measurements on a variety of multicomponent silicate liquids (Lange and Carmichael, 1987, Johnson and Carmichael, 1987; Dingwel…