Materials Literature
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A series of single-face hindered porphyrins has been synthesized from 5,10,15,20-tetrakis-(o-aminophenyl)porphyrin having one ‘handle’ and two pivaloyl ‘pickets’ as substituents in order both to vary the cavity size and to hold the handle in a central position. They have been characterized from the analysis of the 1H…
Temperature-dependent angle-resolved photoemission spectra have been obtained from Cu(001) for normal-emission conditions corresponding to direct transitions originating from various points along the \ensuremath{\Gamma}--\ensuremath{\Delta}--X line. Photon energies were varied from 40 to 106 eV, and specimen temperatu…
This paper summarizes the results from over 300 fracture toughness tests on compact specimens taken from zirconium alloy pressure tubing, primarily Zircaloy-2 and cold-worked Zr-2.5Nb. Test conditions include temperatures from 20 to 300°C, varying hydrogen concentrations and hydride orientations, irradiation at severa…
Increased transformer winding losses are an important consideration in determining the overall impact of harmonic currents in a power system. Frequently, losses due to harmonic currents are assumed to vary with the square of frequency. The purpose of this paper is to compare winding loss calculations from a finite ele…
The electrode and the chemical reactions likely to occur on electrochlorination of sea water are reviewed. The levels of chlorine required to control fouling and the effects of pressure are also discussed. The reactions of chlorine with both common pollutants and chemical additions present in sea water are reviewed, a…
Five different cysteine-containing mutants of the lysozyme from bacteriophage T4 were used to explore the feasibility of using site-directed mutagenesis to generate isomorphous heavy-atom derivatives for protein crystallography. Cysteines 54 and 97, present in wild-type lysozyme, can be readily reacted with mercuric i…
Article Molecular Weight Distribution of Cellulose by On-Line Size Exclusion Chromatography — Low Angle Laser Light Scattering Part I: Basic Experiments and Treatment of Data was published on January 1, 1987 in the journal Holzforschung (volume 41, issue 2).
Abstract Triphenylenes containing six side‐chains O(CH 2 ) n CH 3 , n 3‐5, have been prepared and doped with iodine. The compounds show mesophases which have been characterised by differential‐scanning calorimetry and small‐angle X‐ray scattering. Samples doped with iodine show an electrical conductivity of 10 −4 ‐1…
The title compound, the first alkali metal tetrahydroborate complex to be structurally characterised, has been shown by an X-ray study to be dimeric in the crystal, with each µ2,η3-BH4 group bonding to two metal atoms through one µ2-hydrogen atom apiece and also through one µ3-hydrogen atom; MO calculations at the 6-3…
Electrochemical oxidation of symmetrical dimethylbithiophenes with free α-positions yields electroactive polymers with excellent cycling ability.
The oxidation of the (111) surface of crystalline UO2via U3O7 to U3O8 has been studied by X-ray photoelectron spectroscopy and X-ray diffraction. Oxidation was carried out at 463 and 573 K in 1 Torr† of oxygen. The formation of UO2+x and U4O9 was not observed under these conditions. Anisotropic growth of U3O8 revealed…
Abstract A film flotation technique has been developed for assessing the hydrophobicity/hydrophilicity of an assembly of particles which have a distribution of surface energies. With this method, particles are partitioned by placing them on the surface of a series of aqueous solutions of different surface tensions and…
X-Ray photoelectron spectroscopy, i.r. spectroscopy, and X-ray diffraction have been used to characterise the higher oxides α-, β-, γ-, and δ-UO3. While the i.r. and X-ray diffraction results may be used to characterise each oxide, the X-ray photoelectron spectra for the four phases are very similar. During reduction…
Abstract A new uniaxial compression test, developed for high strength ceramics, has successfully measured the strength of 94% alumina (Al2O3). Testing was done using a procedure developed specifically for obtaining strengths to 10 GPa on very difficult to machine ceramics. Strain gage analysis and fractographic observ…
Kinetic descriptions of the effect of clay minerals on the activity of enzymes are needed for a better understanding of the interaction of enzymes and clays in soil. We used a model clay-enzyme system to study the kinetics of inhibition f acid phosphatase and pyrophosphatase activities in homogenized corn roots by Na-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonocyclopentadienyl compounds of manganese(II). Synthesis, structure, magnetism, and NMR spectraFrank H. Koehler, Nikolaus. Hebendanz, Gerhard. Mueller, Ulf. Thewalt, Basil. Kanellakopulos, and Reinhard. KlenzeCite this: Organometallics 1987, 6, 1, 115–125Publication Date (…
Tetraphenyldithiapyranylidene iodide [DIPS${\ensuremath{\Phi}}_{4}$(${\mathrm{I}}_{3}$${)}_{0.76}$] is a one-dimensional (1D) conductor in which an organic matrix separates parallel channels filled with triiodide ${\mathrm{I}}_{3}$${\mathrm{}}^{\mathrm{\ensuremath{-}}}$ anions. At room temperature, the triiodide chain…
End-point results of a 4-yr followup survey and a randomized control trial of lentinan (LNT) on patients with advanced or recurrent stomach cancer have been investigated in order to evaluate the clinical efficacy of LNT in combination with chemotherapeutic agent tegafur (FT). Eligible (68) patients in control groups w…
The ferronemtaic state which was described theoretically by Brochard and de Gennes can be achieved by doping the liquid crystal with anisotropic ferromagnetic particles. The homeotropic liquid crystal film was successfully prepared for the ferronematic liquid crystal doped with low concentration chiral molecules. The…
Poisoning experiments using pyridine, piperidine, aqueous ammonia, phenol and 2-nitrophenol show that both acid and base sites are involved in the room-temperature photocatalytic dehydrogenation of alcohols (liquid propan-1-ol being chosen for the tests) over a Pt/TiO2 catalyst. The dominant role is played by the base…