Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A detailed mathematical model is presented to investigate the chemical vapor infiltration (CVI) of fiber‐reinforced ceramic composites with a volume‐heating source. Volume heating may be achieved by using microwave power or radio frequency (RF) induction in the case of conductive substrates. The analysis includes a se…
Pure low-molecular-weight mesogenic compounds as well as mesogenic mixtures, able to form glass phases above room temperature, have been investigated by microscopy, calorimetry and X-ray scattering. Indications for two types of short-range order (SRO) in the glassy state have been found. Diffuse low-angle scattering m…
Abstract A new correction method for obtaining quantitative electron probe microanalysis results is described. It utilizes data provided by Monte Carlo simulations and tracer measurements to obtain a detailed picture of the way in which the x‐ray emission process is influenced by the relevant experimental parameters.…
The crystals PbTiO3:Mn have been obtained. The influence of Mn dopant on light absorption, electric conductivity, dielectric permittivity was observed. The defect centers of Mn24, Mn4+, Vo, Fe3+-Vo were determined with EPR test.
The capacitive network often used for the calculation of initial voltage distribution along a transformer winding can be in error for steep impulses. As such pulses are produced by partial discharges (PDs) the application of the concept could contribute to inaccuracies in methods developed for the location of PDs in w…
A method for the parameterisation of molybdenum disulphide is presented which reproduces the crystal structure accurately. The method involves calculating parameters such that there is no net force contribution from any individual term of the potential on any atom. Ideal bond lengths and bond angles are taken from the…
The lattice invariant shear in the β1→γ1′ martensitic transformation in a Cu–Al–Ni alloy is confirmed to be 〈111〉γ1′ Type II twinning by X-ray diffraction and two-surface analysis using single crystals. However, Type II twins have not been observed by electron microscopy in the past. To resolve this conflict, the twin…
A semi-empirical model describing the plane wave shielding effectiveness (SE) of metallized fabrics, both woven and non-woven, has been developed. The model incorporates the plane wave shielding theory of homogeneous metal foils, meshes, and thick perforated metal panels into a formulation for predicting the shielding…
3. A User's Guide to Principal Components. By J. E. Jackson. ISBN 0 471 62267 2. Wiley, New York, 1991. xviii + 570pp. £55.15.
In this paper, computer programs to evaluate kinetic analysis from non-isothermal thermogravimetric data are discussed. The flowcharts for all the programs are shown. These include those based on single-heating-rate and multi-heating-rate procedures. The single-heating-rate methods include the differential and integra…
A method has been developed for screening stator bars and coils using a particular type of partial discharge (PD) detector. The objective in making PD screening tests was to identify those bars or coils which are more likely to fail on voltage endurance in a relatively short time. The majority of the examples given pe…
The low-temperature single-crystal absorption spectrum, far-infrared spectrum and single-crystal structure determination of [Ni(tacn)2][ClO4]2·H2O (tacn = 1,4,7-triazacyclononane) are reported. The compound crystallizes in the monoclinic space group P21/a(Z= 2) with a= 9.614(3), b= 13.451(6), c= 9.648(4)Å and β= 120.1…
Laser-induced multiphoton and SF6-photosensitised decomposition of tetramethoxygermane has been used for chemical vapour deposition of reactive organooxogermanium polymers, which were characterised by IR, VIS, and UV spectra and ESCA and TEM techniques. The properties of the deposited layers differed depending on the…
In view of the limitations inherent to phenomenological approaches, the problem of the internal structure of defects in nematics is here afforded from a molecular viewpoint. By using an extension of the Maier-Saupe mean-field potential which accounts for distorted states of nematics, the general equation applicable in…
The nickel(II) complex of the pendent-arm macrocycle 1-(3-dimethylaminopropyl)-1,5,9-triazacyclododecane (L1) sequesters CO2 from air to yield, after addition of thiocyanate ion, [{(HL1)Ni(NCS)}2(CO3)]2+, the first example of a µ-carbonato dinickel(II) complex; the Ni atoms are antiferromagnetically coupled with the e…
Space charge distributions of PLZT 8/65/35 were measured by the laser intensity modulation method. The effect of space charge on the micro-macro domain transition is shown. Large differences in the depolarization temperature T/sub d/ measured on heating and cooling are due mainly to the effect of space charge.>
The combined influence of temperature and food concentration on Pteria sterna growth was determined, using 3 temperatures and 3 food concentrations. During 15 wk, the shell was measured weekly along the axis of maximum growth. The 2 higher growth rates (4.8 and 4.2 mm mo-') were obtained with the highest ration, at 30…
Abstract Low reaction rates and distinct transition phenomena from the solid to the melt state restrain solid state polymerisation (SSP) reactions of nylon salts for industrial application. To alleviate these problems, catalysts containing nylon salts are employed. In this study, hexamethylenediammonium adipate (HMA)…
A kinetic study has been made on the reduction of iron oxide in molten slag with graphite. The composition of the primary slag was changed so that SiO2 concentration varied between 0.33 and 0.50 mole fraction, and slag basicity between 1 and 2. The experimental temperature was 1300°C. The reaction rate is significantl…
Improving the quality of our environment has become a growing concern in this country and around the globe. Research efforts in this field have recently been accelerated by the passage of the 1990 Clean Air Act. This book reports on a symposium that is part of a continuing series on the surface science of catalysis. I…