Materials Literature
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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…
Participating factors in the uptake of liposomes by the liver were examined in a small-volume circulating perfusion system. The volume of the perfusate was 23 ml, which corresponds to the blood volume of the rat. It is considered that this system is suitable for examining the factors participating in the uptake in viv…
A review of the domains in KH2PO4 crystal is given. This includes a description of the domains and the cell orientations correlated to the texture, the existence of quasidislocations and their role at the domain tips, and a study of lateral displacements of the walls and domain freezing are studied.
The approach derived in Part 2 has been modified to increase the purity and yield of intermediates. The C12 starting materials have been doubled in chain length five times, and by using components of similar or different chain length in Wittig condensations ω-halogeno-acetals with 12n carbon atoms have been made up wi…
Abstract The chemical modification of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) by electrophilic sulfonylation and acylation of the aromatic structural units has been investigated. A maximum monosubstitution degree of 79.4 has been reached. Higher substitution levels were difficult to achieve because of both a decr…
SEM-Instrumentation: Introduction Principles of Operation Specimen/Electron Interactions Detectors Operating Conditions and Limitations Specimen Preparation: Specimen Characteristics Drying Techniques Coating Cryo-SEM SEM X-Ray Microanalysis-Instrumentation: Introduction X-Ray Production in the SEM Wavelength Dispersi…
Base hydrolysis of (η5-C5Me5)TiCl3 in toluene yields [(η5-C5Me5)Ti]4O6 which, according to X-ray structural analysis, has an adamantane-like cage structure with a tetrahedral TiIV4O6 core.
Abstract By addition of metal salts to a basic electrolyte as colouring components coloured ANOF layers can be produced. The colour shades of such layers are dependent on concentration and deposition parameters. Two application examples of coloured ANOF layers are demonstrated.
The He I photoelectron spectra of NbO and TaO have been recorded. In both cases four main bands were observed which can be attributed to ionization of the isolated metal monoxide molecule. Bands associated with other oxides or the metal were not observed.Assignment of the photoelectron spectra of NbO and TaO was made…
Article Statistical and true symmetry of ferrierite: possible absence of straight Τ—Ο—Τ bridging bonds was published on August 1, 1987 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 178, issue 1-4).
We report the first observation on the ‘Lehmann rotation’ of the director configuration of flat cholesteric drops subjected to a DC electric field. This allows us to determine both the sign and the magnitude of the electromechanical coupling coefficient νE of the chiral liquid crystal, which is ≃ −2 × 10−5 q in cgs un…