Materials Literature
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Abstract Graft copolymerization of methyl methacrylate (MMA) was carried out on both defatted and bleached jute fibers using ceric ammonium sulfate (CAS) as the initiator. In order to obtain the optimum condition for grafting, the effects of initiator concentrations, temperature, time of reaction, lignin content of ju…
Finite element (FE) numerical simulation was employed for studying the influence of geometrical factors on the rate of leveling of a triangular surface profile during anodic dissolution in ECM at constant interelectrode gap under conditions of primary current distribution. Theoretical results were verified experimenta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnion-induced fluorescence quenching of aromatic moleculesHaruo Shizuka, Makoto Nakamura, and Toshifumi MoritaCite this: J. Phys. Chem. 1980, 84, 9, 989–994Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://p…
The polarized absorption and fluorescence spectra of 0.01–5% Np3+ doped into single-crystal LaCl3 were measured at moderate and high resolution in the range to 50 000 cm−1 at 298, 77, and 4 K. The 150 crystal field components identified were fit by a parametrized model which has previously been shown to provide an exc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance studies of some ruthenium(III) complexesO. K. Medhi and U. AgarwalaCite this: Inorg. Chem. 1980, 19, 5, 1381–1384Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.org/doi/10.…
The abilities of plasma and serum to support the growth of vascular smooth muscle cells maintained on uncoated tissue culture dishes or dishes coated with an extracellular matrix (ECM) have been compared. Vascular smooth muscle cells maintained on plastic dishes and exposed to plasma proliferate poorly; when exposed t…
A free-energy expression (differing in its symmetry from that of McMillan) is proposed for describing charge-density-wave (CDW) states in transition-metal dichalcogenides having trigonal-prismatically coordinated layers (e.g., 2H-Ta${\mathrm{Se}}_{2}$). An analysis of the single CDW state is given. In disagreement wit…
The reacton of hydrogen with hydroxyl-free vitreous silica has been measured for temperatures between 500 and 850 °C, pressures between 0.132 and 5.78 atm, and sample thicknesses between 0.057 and 1.06 cm. The results can be explained by a simple model often used to explain tarnishing reactions. This model assumes tha…
The electrical properties of (MxV1–x)2O3 (M = A1, Cr, Fe, Ga, Rh, Ti) have been investigated. Only Al- and Cr-doped V2O3 exhibit electrical transitions close to room temperature. X-ray diffraction shows that no critical lattice parameter can be identified to correlate with the occurrence or absence of this transition.…
Abstract The band structure of Mg x Zn 1‐x Te alloys is studied using a double beam wavelength modulated system in first derivative mode. Modulated reflectivity measurements are made from 82 to 300 K within spectral range 2500 to 5400 Å. Structures corresponding to the E 0 , E 0 + Δ 0 , E 1 , E 1 + Δ 1 , e 1 and e 1 +…
The longitudinal magnetoresistance of high-purity aluminium single crystals has been measured by point-contact four-probe method at 4.2 K in the magnetic fields up to 4 T. Squeezing effect of a current is recognized in all specimens, and anisotropy of the squeezing effect, which is induced by magnetic breakdown, is ob…
A new photocathode detector for surface-EXAFS was used to study oxide formation on the surface of polycrystalline Cu plates. The EXAFS spectra taken from the surface of these plates were compared to EXAFS spectra from Cu2O and CuO powder standards. The data demonstrate that Cu2O forms on the surface of Cu during the e…
The visual variations in brightness of R CrA, S CrA, T CrA, and R Mon, all classified as T Tau-like irregular variable stars, have been investigated. Long-period variations with time scales of approximately 1000-1500 days and 8000-10,000 days were found in these stars. These long-period variations are unlikely to be d…
Abstract Mineralogical properties of soils along a 500‐km north‐south transect in the mountainous Asir region were investigated. The transect represented areas of wide variations in climate, parent material, and topography. Soils developed on stable landscapes at higher elevation (> 2,000 m) have well‐developed pro…
Abstract Polyethylenproben unterschiedlicher Kristallinität und Vernetzung wurden zur Freilegung übermolekularer Strukturen plasmachemisch geätzt. Die elektronemikroskopischen Aufnahmen der geätzten Polymeroberflächen zeigten, daß sich Unterschiede im Kristallinitätsgrad bis zu 3% im Ätzrelief widerspiegeln.
Nickel, in low concentration, has been implanted in carbon foil. Both the Ni 2p3/2 and the L3M45M45 Auger levels are shifted 0.9 eV relative to nickel foil, while the valence band level is shifted by 1.2 eV. The characteristic energy loss peak associated with the core and valence levels of bulk nickel is observed on t…
Abstract The most susceptible site for pit initiation was found by optical metallography and transmission electron microscopy to be the retained delta ferrite/austenite interface. Microanalysis results, which were obtained with scanning transmisssion electron microscopy, virtually disprove the chromium depletion theor…
Abstract The small‐angle x‐ray scattering (SAXS) from an Epon 812 and two Epon 828 (one amine‐cured and one anhydride‐cured) epoxy resins has been measured using a Bonse‐Hart system. The data cover the angular range (2θ) between 20 sec and 60 min. After correction for absorption, background and vertical beam divergenc…
A short review is provided of the models used by earlier researchers to explain or predict tear re sistance of woven fabrics. Many such models emphasize either differential yam extension in the region of the tear or differential yarn slippage across the apex of the tear. A limited number of experi ments with selected…
Abstract The roles of pH and ionic strength on the structure and stability of collagen fibrils have been investigated by means of x‐ray and neutron diffraction techniques. High‐angle x‐ray diffraction shows that a salt concentration of 0.5 M KCl is sufficient to reduce the osmotic swelling and related disordering in t…