Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation of 11-Hydroxyated Kauranic Acids From Adenostemma laveniaPing C. Cheng, Charles D. Hufford, and Norman J. DoorenbosCite this: J. Nat. Prod. 1979, 42, 2, 183–186Publication Date (Print):March 1, 1979Publication History Published online1 July 2004Published inissue 1…
Abstract Single phase interpenetrating polystyrene networks were synthesized using a room temperature photopolymerization method. Divinylbenzene was used for crosslinking both networks in most cases; a few IPNs were prepared using acrylic acid anhydride to provide labile crosslinkages in the primary network. The IPNs…
A cotton broadcloth and a polyester/cotton broadcloth were successfully treated in the laboratory using a angle pad bath to impart fire resistance and durable press properties. A two catalyst system was used with rol 76, an oligomeric vinyl phosphonate, and either trimethylol acetylene diureine or dimethylol 4,5-dihyd…
Abstract The photoelectrochemical behaviour of several reagents at the SrTiO 3 anode has been investigated. Current‐doubling was found with several reducing agents. By competitive reaction experiments, hole capture was detected with some other reagents. Quantitative data on relative hole reactivities were obtained for…
Abstract A population balance approach is used to model solid phase reactions in terms of nuclei of the product phase dispersed in the reactant matrix. A conversion‐time relationship is obtained by the solution of a set of moment equations derived from the population balance. Some previously known solutions for both h…
The adsorbate site location for CO on Cu(110) has been investigated with electron energy loss vibrational spectroscopy. With low coverage at 80 K vibrational energies of 85 and 258 meV are observed. At high coverages and/or near the thermal desorption temperature of 170 K, only a single peak at 260 meV is observed. A…
Abstract Three particle size ranges of calcitic and dolomitic limestones were applied at 4.5, 9, and 13.5 metric tons/ha. Evaluations were designed to determine the most efficient treatment for neutralizing soil acidity, and increasing crop production in Katy fine sandy loam (pH 5.2) and Boy loamy fine sand (pH 5.4).…
The effects of high-temperature annealing on cold-worked microduplex austenite/ferrite stainless steels have been studied by following the hardness variations with time and investigating the resulting microstructural changes using transmission electron microscopy. It has been found that the resulting microstructures a…
Abstract Single crystals of Cu 2 SrGeS 4 and Cu 2 BaGeS 4 were prepared by using molten bromides as solvents. The compounds crystallize isotypically to their homologous thiostannates(IV) [1, 2]. (Cu 2 SrGeS 4 : Space group P3 2 , a = 614, 3 , b = 614, 3 and c = 1528, 2 pm; Cu 2 BaGeS 4 : Space group P3 1 , a = 621, 5…
Optical spectra in the 1.5 to 3.2 eV range are studied in the layered compound WSe 2 by wavelength and temperature-modulated reflectivity, as well as by modulated photovoltaic effect from 4.1 to 300 K. The selection rules for optical transitions in WSe 2 are deduced, and the spectra are interpreted with the help of th…
An easy axis distribution and a crystal texture in a warm extruded anisotropic Mn-Al-C magnet were determined by X-ray diffraction analyses. Resulting values in (001) pole density are treated by introducing a normalization condition in order to determine the quantitative values. The distribution is expressed only as a…
Abstract The Critical Oxygen Index test has been used as a measure of the flammability of a wide range of substances, including plastics, textiles and liquids, since its introduction in 1966. The index, however, is only appropriate to the configuration and conditions used in the test, and extrapolation in order to pre…
The magnetization in Li0.5−z/2ZnzFe2.5−z/2O4 with z=0.0, 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7 has been measured at 30 K and at applied magnetic fields of up to 100 kOe. The magnetization for samples with z?0.2 saturated at less than 10 kOe. The magnetization for samples with z?0.3 did not saturate. Rather, for applied fie…
A wet-processing technology which uses air instead of water as the primary diluent has been developed. The process consists of mechanically foaming a suitably formulated finish or dye formulation and then applying the foam to textile fabrics. Collapse of the foam distributes the finish on the substrate. The fabric is…
The chemical and physical compositions of C‐S‐H formed in paste hydration of C 3 S cured at 4°, 25°, and 65°C and of C 2 S and a C 3 S/C 2 S blend cured at 25°C were studied using quantitative X‐ray diffraction analysis (QXDA), extraction, and thermal effluent gas analysis (TEGA) to determine the free CH content. The…
Amorphous ribbons of LiNbO 3 , PbTiO 3 , and (PbTiO 3 ) 0.9 (B 2 O 3 ) 0.1 were obtained by a roller quenching technique. These ribbons were examined by electron diffraction as well as by X-ray diffraction experiments, and were proved to be in the amorphous state. Their dielectric constant increased rapidly with incre…
Abstract Gravimetric sorption rate measurements have been carried out for (CO 2 , H 2 ), and ten C 1 ‐C 6 organic vapors at low concentrations (≤ 0.2%) in PVC films and uniform‐particle powders at 30°C. The dominant transport process in all cases appears to be Fickian diffusion. A distinguishable contribution of relax…
Experimental sintering studies On undoped and cao‐doped Mgo powder compacts in Static air and flowing Water Vapor atmospheres were conducted at 1230° to 1600°C. Corresponding microstructural changes of specimens during sintering were examined by scanning electron microscopy. Kinetic and microstructural data were analy…
Abstract K 2 Sb 4 S 7 · H 2 O crystallizes in the triclinic system with a = 1171.4(5) pm, b = 952.0(5) pm, c = 715.6(5) pm and α = 99.36(5)°, β = 86.80(5)°, γ= 103.48(5)°. One half of the Sb atoms has three sulfur neighbours forming with the free electron pair a ψ-ShS 3 tetrahedron, while the other half is coordinated…
For safety and convenience, ultrasonic corona sensors are mounted on the outer surface of power transformer tanks, and consequently, can only receive ultrasound from internal electrical discharges after attenuation through the oil and tank wall. In order to reduce this attenuation and maximize the detected signal, it…