Materials Literature
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Wide-angle X-ray scattering studies of carbon nanotubes produced by catalytic decompositiou of acetylene on a supported Co catalyst are reported. The X-ray intensities were recorded up to maximum scattering vector K m a x = 2 4 A a n d t h e n F o u r i e r t r a n s f o r m e d t o r e a l s p a c e . Y i e l d i n g…
Crystallization is one of the most critical unit operations in the pharmaceutical industry. Pharmaceutical companies invest solid form of the drug substance. Rapid development of a candidate depends on the ability to produce desired drug substance with consistent properties as early as possible. This paper discusses t…
对青海省都兰县香日德南部东昆仑山区一带侵入于元古界苦海岩群的变形变质闪长岩体同时进行了锆石U-Pb和角闪石<sup>40</sup>Ar-<sup>39</sup>Ar年代学研究. 单颗粒锆石U-Pb年龄为(446.5 ± 9.1) Ma; 角闪石Ar坪年龄为(488.0 ± 1.2) Ma, 等时线年龄为(488.9 ± 5.6) Ma, K-Ar年龄为(462.8 ± 8.8) Ma. 角闪石的K-Ar年龄和良好的<sup>40</sup>Ar-<sup>39</sup>Ar坪年龄及等时线年龄显著高于锆石的U-Pb年龄, 可能为含过剩Ar的结果, 不代表岩石的变形变质年代. 锆石的U-Pb年龄可代表岩体的侵入年代, 表明从格尔…
The existence of "lateral birefringence," i.e., the difference between the refractive index for light polarized parallel to the fiber radius and light polarized perpendicular to the radius in the cross-sectional plane, combined with the existence of electron diffraction contrast "bands" in longitudinal fiber sections…
The studies of superlattices in ferroelectric crystals have made a rapid progress since 1980s. A superlattice is composed of modulated domains on the micron scale, controllable with modern techniques. It reveals a number of novel physical properties of optical and acoustic character. In this paper, we review recent ad…
Abstract An instrumental method is described that enables real-time measurement of in-plane anisotropic liquid absorption in nonwoven fabrics. The system uses variations in electrical capacitance to monitor changes in the liquid absorbed by a fabric as a function of time. In the computer-integrated system, multiple ca…
We describe our method based on pulse radiolysis with optical detection developed for the examination of the kinetics and mechanism of the first steps of high-energy radiation initiated polymerization. The absorption spectra of the intermediates were obtained in cyclohexane solution of hexanediol diacrylate (HDDA) of…
An electron tracing code in spherical coordinates was used to treat irregular, nonspherical boundaries in the “Herzog regions” at the exit and entrance planes of hemispherical energy analyzers. Some of the classical designs, i.e., the sudden cutoff “ideal field” approximation, real apertures in the 180° plane, the Her…
Depth of field (DoF) in scanning electron microscopes is evaluated at high magnifications where the image resolution is limited by the probe size. The calculation of DoF is made in terms of the information passing capacity of an optical system or entropy of the image estimated along the optical axis near focus. Electr…
The structure of DLH (C123S) with PMS bound was solved to 2.5 A resolution (R factor = 15.1%). PMSF in 2-propanol was delivered directly to crystals in drops and unexpectedly caused the crystals to dissolve. New crystals displaying a different morphology emerged within 2 h in situ, a phenomenon that appears to be desc…
A study on the newly developed couplant li quid and gel suitable for ultrasonic NDT inspecti on is reported . Results of the meas urements of various physical parameters like viscosity , density, ult rasonic velocity, etc. which have direct influence on acoustic coupling, are reported . With the help of the measured u…
In a finite element code using magnetic vector potential as unknown, the fixed point method needs the relationship which gives the magnetic field H from the magnetic flux density B. In this paper, we present two methods to obtain the magnetic behaviour H(B) of a ferromagnetic material. The first uses centred cycles to…
As a new azide-free gas generant, the thermal behavior of the Sr complex nitrate of carbohydrazide was investigated in the mixed system with various oxidizing agents (KClO4, KBrO3, Sr(NO3)2, KNO3). For the differential thermal analysis, the initial temperature of the reaction of mixtures with KBrO3 was lower than that…
ABSTRACT Aqueous solutions of sodium hydroxide were used to debran whole sorghum and millet grains. The alkali solution was effective in dissolving the pericarp, leaving the kernel free of pericarp. Various combinations of concentration of sodium hydroxide (3, 6, and 10%, w/w) and soaking duration (5, 8, and 10 min) w…
DSC, X-ray, broad-line proton NMR, and microscopy studies on several series of N,N' -dialkanoylbenzene-1,2-diamines are presented. The melting point and associated enthalpy are not much affected by methylation of the aromatic nucleus. While the dimethyl compounds carrying heptanoyl-to-hexadecanoyl groups generate meta…
The effect of sulfur accelerators during the curing process in natural rubber (NR) was investigated. The samples were prepared by adding the same fraction of various types of accelerators in the compound and all samples were cured at the same temperature but for two different times. Determination of the molecular mass…
Homeotropic nematic layers of MBBA, oriented by self-assembled layers (on glass substrates) of dilauroyl phosphatidyl choline (DLPC), cetyl trimethyl-amonium bromide (CTAB) and silane orienting agent (ODS-E), were studied by phase-sensitive flexoelectric spectroscopy method. DLPC solutions in chloroform provided multi…
Abstract The determination of the optimum lime content of fly ash is very important to enhance its use. Recently, methods have been established to obtain the optimum lime content of fly ashes. Strength obtained at different ages becomes important for different applications. The effect of the curing period on the optim…
The design, construction, and use of a furnace from which time-resolved x-ray diffraction data may be measured from reacting mixtures of solids or of solids and liquids is described. The furnace is a vertical tube design, constructed from commercially available components, and can operate at temperatures of up to 1000…
Recent research into superplasticity has developed substantially, to the extent that there are now important directions for future investigations, one of which is high strain rate superplasticity (i.e., superplastic behaviour at strain rates over 10-2 s-1) in metallic materials. Superplasticity at extremely high strai…