Materials Literature
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Abstract Seah and Smith have reported a method of measuring the peak‐to‐background ratio below the silver LMM Auger peak as a function of the pass energy of a hemispherical electron spectrometer. They used this measurement to reveal the extent of a contribution to the observed spectrum due to secondary electrons gener…
Abstract 3-Acetamido-6-heptafluoropropylphenylboronic acid was synthesized by the perfluoroalkylation of 3-acetamidophenylboronic acid (pKa = 8.3) with bis(heptafluorobutyryl)peroxide. The perfluoroalkylated phenylboronic acid thus prepared was determined to have a low pKa as 6.6 by potentiometric titration. Lowered p…
Bi-containing crystals of YbAl 3 (BO 3 ) 4 and ErAl 3 (BO 3 ) 4 with the huntite structure doped with Si 4+ , Ge 4+ and transition metal cations Ti 4+ , V 5+ , Cr 3+ and Mn 4+ have been grown by spontaneous crystallization from fluxes based on Bi 2 O 3 -B 2 O 3 -Li 2 O. The Li + cation was used for charge compensation…
Abstract This paper analyses the terminal ballistic performance of segmented rod penetrators in semi‐infinite, spaced as well as reactive targets. The model scaled projectiles with a mass of about 10 g are launched by a light gas gun of caliber 30 mm at velocities up to 4 km/s. To keep the initial acceleration low eno…
Abstract Exploration of the reactions of the 9‐azahomocubane system led to derivatives of two small‐ring systems containing aza‐bridging atoms, 5‐azatetracyclo[4.2.0.0 3,8 .0 4,7 ]octane and 9‐azatetracyclo[4.3.0.0 2,5 .0 4,7 ]nonane. The structures were characterized by X‐ray diffraction analyses. There are no prior…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-liquid equilibria of six binary mixtures containing indoleChiaki Yokoyama, Takeo Ebina, and Shinji TakahashiCite this: J. Chem. Eng. Data 1993, 38, 4, 583–586Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 Octob…
Abstract During the last 10 years shaped charges with spherical liners have arosed great interest in research and development because their application in special munition results in an increase of performance. The present report presents measured characteristics of shaped charges with hemispherical liners. A short ex…
The thermodynamic and phase equilibrium data of the binary Mg-Cu system were assessed thermodynamically to yield two descriptions. In the first description, the liquid and the (Cu) phase were treated as substitutional solutions and the two intermetallic phases, Mg[sub 2]Cu and MgCu[sub 2], as stoichiometric phases. In…
Epitaxial films of layered GaSe with (0001) surfaces have been grown on GaAs(001) substrates in spite of the large difference in their crystal symmetry. In situ observation of reflection high-energy electron diffraction has revealed that a number of facets grow on the surface of GaAs(001) under Se irradiation. The exi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic origin of nonstoichiometry in early-transition-metal chalcogenidesJeremy K. Burdett and John F. MitchellCite this: Chem. Mater. 1993, 5, 10, 1465–1473Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October…
The thermodynamic cycle appropriate to an alkali metal thermal‐to‐electric converter (AMTEC) cell is discussed for both liquid‐ and vapor‐fed modes of operation, under the assumption that all processes can be performed reversibly. In the liquid‐fed mode, the reversible efficiency is greater than 89.6% of Carnot effici…
The thermodynamic properties of Fe-Nd alloys have been determined between 973 and 1073 K by emf measurements on galvanic cells using CaF[sub 2] as solid electrolyte. The activity of Nd in iron-rich solid solution alloys shows positive deviations from ideality. The Gibbs energies of the intermetallic compounds Fe[sub 1…
This report discusses fourteen tests which were conducted to investigate the perforation of thin unreinforced concrete slabs. The 4340-steel projectile used in the test series is 50.8 mm in diameter, 355.6 mm in length, has a mass of 2.34 kg. and an ogive nose with caliber radius head of 3. The slabs, contained within…
Abstract Reduction of aldehydes and ketones with 2-propanol proceeded efficiently over silica-supported zirconium catalyst, and the corresponding alcohols were obtained in high yields. In the reduction of aldehyde, the acetalization did not occur and the side reaction, the aldol condensation, was inhibited.
The preparation of liquid-crystalline 2,5-bis(4-alkyloxyphenyl) thiazolo [5,4-d] dithiazoles (ATT n ), in which the alkyl group is C n H2n + 1 (where n = 1 to 10, 12), has been described. Mesomorphic properties and phase transitions as determined by polarizing hot stage microscopy and differential scanning calorimetry…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract Weathering of spodumene in a lateritized pegmatite in Western Australia was studied by investigating in situ samples by electron-beam techniques. The spodumene had mostly altered to smectite. However, some non-crystalline material adjacent to smectite and intermixed with smectite was also observed. No crystal…
Abstract— Large‐area (12 × 100 cm) flexible displays were successfully fabricated using ferroelectric liquid‐crystalline polymers (FLCPs). The polymers were comb‐shaped and had side chains which consisted of a flexible spacer unit, a rigid core moiety, and an optically active end‐group. These displays are lightweight…
Amorphous Al 2 O 3 –ZrO 2 composite powders with 5–30 mol% ZrO 2 have been prepared by adding aqueous ammonia to the mixed solution of aqueous aluminum sulfate and zirconium alkoxide containing 2‐propanol. Simultaneous crystallization of γ‐Al 2 O 3 and t ‐ZrO 2 occurs at 870°–980°C. The γ‐Al 2 O 3 transforms to α‐Al 2…
Abstract The unwanted scattering of electrons in electron spectrometers leads to a loss of sensitivity, distortion of the spectral background and problems in calibrating spectrometer intensity/energy transmission functions. Here we develop three methods to analyse the extent of the contribution and how to reduce it to…