Materials Literature
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The crystal structure of adenylate kinase from maize ligated with an inhibitor has been determined by molecular replacement and refined to 3.5-A resolution. The enzyme keeps the ATP/ADP/AMP equilibrium in the cell. In the C4 plant maize, it has the special task to recycle the AMP produced in large amounts in primary C…
Various oxide-promoted Ni catalysts supported on activated carbon were prepared, and the effect of promoters on the surface structure and properties of Ni catalysts was studied. Physical adsorption (N 2 adsorption), thermogravimetric analysis (TGA), temperature-programmed desorption (TPD), X-ray diffraction (XRD), and…
A method for sample work-up and enrichment using Supported Liquid Membrane (SLM) and liquid chromatographic determination of triazine herbicides in natural waters was investigated. A porous PTFE membrane was impregnated with a water immiscible organic solvent, forming a barrier between two aqueous phases. With a flowi…
The U.S. cotton classification system has been undergoing significant changes, moving from human classing to the use of precise instruments. Along with this trend, the current research is an effort to develop a new computer vision system to measure detailed trash and color attributes of raw cotton. The system primaril…
Abstract Electrical resistivity and morphology of high impact polystyrene (HIPS)/styrene‐isoprene‐styrene copolymer (SIS)/carbon black (CB) blends were studied. Conductive CB particles locale preferentially within the HIPS phase of the HIPS/SIS blends. The blends studied remain conductive as long as HIPS maintains a c…
An aluminosilicate glass of composition 61SiO 2 6Al 2 O 3 10MgO6ZnO·12Li 2 O·5TiO 2 (mol%) has been prepared by a melting process and investigated as far as crystallization is concerned. Glass‐ceramic is easily obtained because glass shows a high tendency to crystallize starting from 700°C. The crystalline phases evol…
Dynamic Mechanical Analysis (DMA-7, PERKIN ELMER) is a very useful device for determining the thermal expansion and the low-frequency elastic compliances of crystals. The complex compliances can be measured in a frequency range from 10mHz to 50Hz and for temperatures between 6 and 1300K. A great advantage is that also…
Abstract The adsorption of the cationic dye acridine orange (AO) by Na-saponite and the colloidal properties of the aqueous suspension were investigated by visible spectroscopy and XRD. The organic cation is adsorbed by the mechanism of cation exchange. When small amounts of the dye are adsorbed, the system contains s…
The structure of chalcogenide glasses x Sb 2 S 3 ·(1 − x )As 2 S 3 with 0 ≤ x ≤ 0.75 was studied by infrared reflectance spectroscopy. The absorption coefficient spectra, calculated from reflectance by Kramers−Kronig analysis, were deconvoluted in the high-frequency region from 250 to 450 cm -1, and the frequency and…
We report electrical measurements in different Pb[(Mg1/3Nb2/3)0.9Ti0.1]O3 ceramics exhibiting a spontaneous relaxor to ferroelectric transition. Both the relaxor behavior and the phase transition are found to depend strongly on the lead vacancies content. An explanation based on an increase of the ordered domains and…
All articles of this category A variety of N -heteroaromatic compounds were converted into their corresponding N -oxides with good yields and with high chemoselectivity in the presence of hydrogen peroxide as oxygen donor and a catalytic amount of Mn-porphyrin. The scope and limitation of this method are discussed. he…
The shear orientation of a nematic side-group liquid crystalline polymer (SG-LCP) with side-on fixed mesogenic units was investigated by means of rheo-birefringence and rheo-small angle light scattering. Rheological properties of the polymer depend on molecular weight. Macroscopically aligned samples were obtained in…
We succeed in preparing anisotropic magnetic powders with high performance based on the NdFe10.5Mo1.5Nx nitrides. The properties of these materials are favorable for permanent magnet application. The domain structures of the NdFe10.5Mo1.5 and NdFe10.5Mo1.5Nx were studied by using magnetic force microscopy. Upon nitrog…
Relatively recent failures in seawater systems of highly alloyed (i.e., pitting resistance equivalent [PREN] > 40) stainless steels (SS) have highlighted the issue of corrosion testing and safe-use limits. Three aspects of testing and selection of SS for seawater application were reviewed: relevancy of the elec…
The local phenomenology associated with membrane fouling has been investigated experimentally at laboratory scale for the crossflow microfiltration (CMF) of beer. Two downstream membrane processes were involved: clarification and sterilisation of beer. Fouling mechanisms were interpreted and compared for two types of…
Single crystals of ${\mathrm{LaCl}}_{3}{:1%\mathrm{}\mathrm{Er}}^{3+}$ were grown by the Bridgman technique. ${\mathrm{Er}}^{3+}$ substitutes for ${\mathrm{La}}^{3+}$ and has a site symmetry of ${C}_{3h}$ in ${\mathrm{LaCl}}_{3}.$ Seventy-three energy levels of ${\mathrm{Er}}^{3+}$ were determined up to $45000{\mathrm…
Abstract A conductive plastic was compounded in a twin screw extruder by incorporating conductive carbon fiber (CF) into an acrylonitrile‐butadience‐styrene (ABS) copolymer. The effects of various processing parameters prior to injection molding were investigated; then, the electromagnetic interference shielding effec…
Dodacanethiol-capped silver “quantum dot” particles (Q-particles) have been synthesized using a novel biphasic microemulsion (Winsor II type) of diethyl ether/AOT/water. FT-IR investigations and elemental analyses support the encapsulation of silver particles by dodecanethiol while the transmission electron micrograph…
The mechanical behavior of MoSi 2 reinforced–Si 3 N 4 matrix composites was investigated as a function of MoSi 2 phase content, MoSi 2 phase size, and amount of MgO densification aid for the Si 3 N 4 phase. Coarse‐phase MoSi 2 ‐Si 3 N 4 composites exhibited higher room‐temperature fracture toughness than fine‐phase co…
Abstract Hydrogen-forms of <2 µm fractions of six bentonites of various Fe contents were prepared by H + →OH - →H + ion exchange using resins. Potentiometric titration curves revealed that the number of strong acid sites varied and accounted for 60-95% of the total acidity in the freshly prepared H-forms. The numbe…