Materials Literature
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Molecular biology and genomic sciences are revealing the early biological signatures for many diseases. In response, the Molecular Imaging community is rapidly developing contrast agents to visualize the nascent pathological changes and to concomitantly deliver treatment directly to the site of disease. The evaluation…
The thermodynamic functions free energy, enthalpy, and entropy of solution, were evaluated from the solubility data of acetanilide, acetaminophen, and phenacetin, determined at several temperatures in water, octanol, isopropyl myristate, and chloroform. These three organic solvents mutually saturated with water, and f…
An economic method is presented to grow undoped/doped tungsten oxide nanowires with high purity and erect orientation, simply by heating a tungsten filament in a vacuum chamber with some room air leakage. Tungsten oxide nanowires were studied using scanning electron microscopy (SEM), energy dispersion x-ray spectrosco…
We present magneto-optical studies of intra-center absorption band related to neutral Mn acceptor in GaN bulk crystals. The band is built of a zero-phonon line at $1.4166\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ followed by GaN phonon spectrum. Magneto-optical experiments performed in magnetic fields up to $22\phantom{\…
To study the transport properties of individual helical polyacetylene (PA) fibers, we developed a method to extract a single fiber from tightly entangled ropes of helical PA bulk film. After a few minutes of sonication of a piece of helical PA bulk film in an organic solution containing surfactant, a droplet of soluti…
利用黏土矿物X射线衍射峰(XRD)拟合与分解的方法, 结合透射电子显微镜(TEM)和X射线能谱(EDX)分析, 发现在洛川黑木沟剖面黄土-古土壤序列(S<SUB>0</SUB>-L<SUB>10</SUB>)的黏土矿物中存在两种不同类型的伊利石, 一种是结晶度差、衍射峰宽且钝的伊利石, 其在<2µm的黏土矿物中的最高含量为55%; 另一种为结晶度好、衍射峰窄且锐的伊利石, 这两种伊利石的含量在剖面上呈明显的互补变化关系. X射线能谱分析表明, 与结晶度好的伊利石相比, 结晶度差的伊利石较富含K<SUP>+</SUP>, Si<SUP>4+</SUP>, 贫Al<SUP>3+</SUP>.
The crystal structure of La 0.67 Ca 0.33 Mn 0.80 Cu 0.20 O 3 (LCMCO) compound was determined from laboratory X-ray powder diffraction data and refined by the Rietveld method. LCMCO is isostructural with La 0.67 Ca 0.33 MnO 3 (LCMO). The crystal data are: La 0.64 Ca 0.36 Mn 0.82 Cu 0.18 O 3.01 , M r =843.80, orthorhomb…
Research Article| December 01, 2004 Rb-Sr Isotopic and elemental studies of the origin of glauconite in the Permian northern Karoo Coal Fields, South Africa: Evidence for a thermal Mid-Jurassic influence J. M. Barton, Jr.; J. M. Barton, Jr. Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park…
Using two hexagonal samples of ice, polycrystalline and single-crystalline, the electrical treeing has been investigated under an applied impulse voltage. The crystallinity and temperature of the ice play an important role in the events of the treeing. In the single-crystalline ice, the tree in the samples at -25 /spl…
Abstract This article discusses the principles of physical metallurgy and metallography of depleted uranium. It describes the techniques involved in the preparation of thin foils for transmission electron microscopy and illustrates the resulting microstructure of uranium and uranium alloys, with the aid of black and w…
The influence of synthesised benzoyl hydrazine and some of its substituents on the inhibition of corrosion of carbon steel in 1M sulphuric acid solution were investigated using weight loss, gasometric measurements, potentiodynamic polarisation studies and impedance measurements. Corrosion kinetic parameters clearly re…
Abstract In this paper we show that ‘permeability’ of a heterogeneous structure with mass transport and thermodynamic properties varying across its thickness is a misleading concept leading to incorrect results and design decisions while two structural transmission rate equations are recommended for practical applicat…
A wet chemical process has prepared Al-substituted barium ferrite nanoparticles BaFe11AlO19. Structural and magnetic properties of BaFe11AlO19 powers were characterized with an X-ray diffractometer, a vibrating sample magnetometer, and a Mössbauer spectroscopy. The results of X-ray diffraction measurements showed that…
A new nondestructive characterization technique, based on a modified Maker fringe measurement, is reported that allows the complete determination of complex spatial distributions of the nonlinear χ(2)(z) coefficient in planar samples. Each sample under test was stacked together with a phase reference quartz plate to r…
After two previous reconsideration steps on cathodic charging and hydrogen stress cracking, then permeation measurements, a third step is presented on the SOHIC mechanism, and more generally any interaction between internal hydrogen and moving dislocations. This results in a unified mechanism for all forms of hydrogen…
The effect of pressure on the ferromagnetic phase transition has been studied in manganese doped III-V semiconductors by electrical conductance and Hall measurements. We found that the application of hydrostatic pressure shifts the transition temperature upwards both in (In,Mn)Sb and (Ga,Mn)As. The anomalous-Hall coef…
Aqueous gelcasting with a low toxicity monomer system has attracted increasing attention. The present study attempts to enhance the flexural strength of green bodies gelcast from a low toxicity hydroxyethyl methacrylate (HEMA) system by introducing an appropriate amount of the water soluble polymer polyvinylpyrrolidon…
A stroll through memory lane highlighting the author's contributions to phthalocyanines, including synthetic aspects especially of binuclear species, manganese oxygen breathing chemistry, mixed valence species, solution and surface electrochemistry, electrocatalysis, two-electron concerted processes, charge transfer s…
Abstract The compounds [Ti(OPr) 3 (isoeugenolate)] 2 and [Ti(OR) 3 (OCH 2 CH 2 NH 2 )] 2 (R = i Pr, Et), obtained by reaction of titanium alkoxides with isoeugenol (2-methoxy-4-propenylphenol) or 2- aminoethanol, are centrosymmetric dimers with a central Ti 2 (μ 2 -OR) 2 unit. The isoeugenolate and 2-aminoethanolate l…
Thermoelectricity in general is of strong scientific and technologicalinterest due to its application possibilities ranging from clean energy to photonsensing devices. Recent developments in theoretical studies on t hethermoelectric effects, as well as the newly discovered thermoelectric materialsprovide new opportuni…