Materials Literature
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When bonds are removed one by one and at random from a finite-size resistor network, the conductance (or resistance) does not change continuously, but rather a sequence of conductance (resistance) jumps for various sizes occurs. The larger jumps arise from those bonds which carry a relatively large current just before…
The epipelic diatoms from various water bodies from the south-western part of the Hornsund fiord area are presented. Altogether, 157 taxa (127 species together with their variants and forms) have been identified. The flora consists almost entirely of diatoms from the order Pennales which is represented predominantly B…
Films were produced by pulsed laser evaporation of various solid polymer targets in vacuum. Smooth films and relatively low deposition power thresholds (<107 W/cm2 peak) were observed for strongly absorbed ultraviolet wavelengths. Poorly absorbed wavelengths gave powdery deposits. For many polymers the evaporat…
Heavy metal fluoride glass materials are attractive for optical applications in the near ultraviolet through infrared wavelength regions. However, many compositions are relatively soft and hygroscopic, and possess low softening temperature (250°C-300°C). We have applied ion assisted deposition (IAD) techniques to depo…
Extremely large spontaneous polarization (>10/sup -7/ C/cm/sup 2/) and permittivity (>10000) are observed in appropriately designed ferroelectric liquid crystals. The permittivity and its temperature dependence are found to be influenced strongly by the electric field and a wall effect. These results are discussed in…
This paper reports a new method of measuring the work function of meterials. The method is based on accurate measuring of energy distribution of secondary electrons and contact potential difference of meterials. We call it the method of secondary electron emission-contact potential difference (SEE-CPD method). The wor…
In order to investigate microscopically the effects of crystallinity and temperature on the fatigue crack growth behavior of polypropylene, the microfractographs were discussed based on the fatigue crack growth curves (a-N curves).The results obtained were as follows:(1) Two kinds of damage zone occurred at the crack…
A method of utilizing an adjustable-frequency controller (AFC) with a line bypass, to provide the energy saving potential of an AFC coupled with the inherent reliability of a simple magnetic starter, is presented. The proposed system allows the transfer of the motor between the AFC and the power line, even after a con…
Describes soil characteristics, uses, management, and productivity of vertisols in Ghana and discusses the potential for improved management using draught oxen. Includes recommendations.
The main object of this study is to examine the sintering behavior of pure materials in low pressure plasmas. Here, Mo, Al2O3, and Si3N4 were chosen as examples of metallic, ionic, and covalent materials. The compacts were heated in a radio frequency inductively coupled plasma under low pressure, N2, H2, Ar, and H2+Ar…
Rapidly Quenched aluminum-titanium alloys provide excellent characteristics as electrodes for electrolytic capacitors, since anodic oxide films formed on them have large dielectric constants and high breakdown voltages. Structure of the oxide films was analyzed by the use of TEM, EDX and X-ray diffraction techniques.…
Amorphous silicon nitride powder (particle size: 0.04μm) obtained by the vapor phase reaction of Si(CH3)4-NH3 system was compacted into pellet and heat-treated in N2 to investigate the crystallization behavior. The amorphous powder crystallized to 100% α-Si3N4 by the heat treatment for 1h at 1550°C. The equiaxed cryst…
The thermal decomposition of europium (III) acetate tetrahydrate has been studied by thermal analysis, X-ray diffraction, IR, gas chromatography and chemical analysis. The dehydration of tetrahydrate begins at 70°C and two unknown hydrates are produced in the process of the dehydration, which occurs in three steps. Tw…
The transpiration method was used to study the evaporation of Sb 2 O 3 from a glass melt with the composition 70SiO 2 ·15K 2 O·15CaO·MgO (in wt%) at 1200° to 1300°C. The glass contained about 0.9 wt% Sb 2 O 3 . Assuming the monomer Sb 2 O 3 is the species of evaporation, the saturation vapor pressures could be calcula…
Jet stretch during the formation of threads in the wet spinning process is characterized by means of a force-elongation diagram. Criteria to assess the spinning stability can be deduced from such a diagram with the help of the reserve of force and reserve of elongation by linking the breakage behaviour of the thread b…
The effect on corrosion of composition and microstructure in a series of Fe-Cr-10% Ni alloys with increasing chromium content has been investigated in reducing acids. In the range of 25 to 35% chromium there is a wide variation in the relative amounts of ferrite and austenite. In reducing acids (H2SO4 and HCl) there i…
Pitting behavior of SUS 304 stainless steel at elevated temperatures has been studied in NaCl solution over the temperature range of 25-50°C. Pitting potentials (EP) and repassivation potentials (ER) were determined by the stepwise cyclic polarization technique under a deaerated condition. With increasing temperature,…
Article Semi-empirical Correlations between Group Number, Atomization Enthalpy and Glass Transition Temperature* was published on January 1, 1988 in the journal Zeitschrift für Physikalische Chemie (volume 156, issue 1).
A method for calculating the magnetizing and coupling fields, anisotropy field, and demagnetizing factors in various thin-film anisotropic structures is presented. Single-stripe and multistripe structures are investigated. A generalized method for calculating the magnetization in thin-film structures with arbitrary sh…
Silicon nitride and sialon ceramics are receiving a great deal of attention as potential high temperature structural materials for engines and other demanding applications. The sintering behaviour and high temperature preformance of these ceramics is strongly influenced by the sintering additives, impurities and powde…