Materials Literature
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The expansion behavior of bubbles in silica glass concerning Czochralski silicon crystal growth has been investigated. It is found that most of the bubbles expand considerably under an Ar atmosphere of 20 Torr and 1500°C. The bubble expansion can be classified into three groups. The first group shows huge expansion wh…
A study has been carried out of the effect of a brief anneal at 450–550 °C on the conductivity of porous silicon coated with a metallic film. Porous silicon, formed on p -and n -type substrates, had porosities of 16–40% and 5–10%, respectively. It has been shown that for anneals at 500 and 550 °C porous silicon on p -…
The fabrication of transmission filters with single or multiple flattened passbands based on chirped Moiré gratings is reported. The gratings are fabricated by the dual-exposure of a single chirped phase mask in conjunction with an amplitude mask. The filters have a ripple < 0.5 dB in the passband, exhibit an isola…
The structures of orthorhombic lysozyme grown at basic pH and its low-humidity variant have been solved and refined at 1.9 and 2.0 A resolution, respectively. A comparison of the native structure with those of crystals grown at acidic pH does not show any systematic pH-dependent difference in the molecular geometry. T…
Chemical and biological extraction and electroultrafiltration (EUF) desorption of potassium (K) from four size‐fractions of indigenous glauconitic sandstone were studied to assess its K‐supplying potential. Potassium extracted by chemical extractants showed an increase in K release with decrease in size of the particl…
This study has characterized the influence of thermal barrier coatings (TBCs) applied to combustion chamber surfaces on the emissions from an indirect injection (IDI) diesel engine. The TBCs were applied to the piston crown, the cylinder head (fire deck) and the valves of a single cylinder Yanmar TS-180 IDI diesel uti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolydifluoroacetylene, Polychlorofluoroacetylene, and PolydichloroacetyleneGeorge L. Gould, Veena Eswara, Roxana M. Trifu, and David G. CastnerView Author Information Department of Chemistry, 845 West Taylor Street University of Illinois, Chicago, Illinois 60607-7061 D…
XPS spectra of graphite-filled poly(vinylidene fluoride) (PVdF) are presented. The specimen consists of 17 wt % PVdF and 83 wt % graphite. A freshly cut surface was examined using monochromated Al Kα x-rays. Spectra include a survey scan, C 1s and F 1s regions, and the F KLL Auger transitions.
Abstract New porous coordination polymer, {(H2dpds)2[V10O26(OH)2]·10H2O}n (H2dpds = bis(4-pyridinium) disulfide), was synthesized and structurally characterized. X-ray analysis demonstrates that the decavanadate anions are doubly bridged by H2dpds ligands to provide a one-dimensional structure. This network affords ch…
The ligand [3-(diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] (dpps) can be prepared by reacting [3-chloropropyl]-hepta[propyl]-[octasilsesquioxane] (cs) with KP(Ph)2. The transition-metal complexes [Rh(CO)(dpps)2Cl], [Rh(COD)(dpps)Cl] and [Pt(dpps)2Cl2] are synthesized as models of functionalized sili…
This work investigated the weldability and mechanical properties of weldments made with Inconel filler metals I-52 and I-82 in the welding of Inconel alloy 690. Gas tungsten arc welding was used with different multipass sequences. The microstructures of the fusion and heat affected zones were examined and weldment pro…
Abstract Single crystals of the new compound Li 2 Co 3 (SeO 3 ) 4 have been synthesized under low-hydrothermal conditions. The structure was determined by direct methods from single crystal X-ray diffraction data (monoclinic, space group P 2 1 / c , a = 8.095(2) Å, b = 9.236(3) Å, c = 7.781(2) Å, β = 115.76(1)°, V = 5…
Nernst coefficient measurements of ${\mathrm{La}}_{0.88}{\mathrm{MnO}}_{3}$ (${T}_{c}\ensuremath{\sim}265$ K) are reported as a function of temperature (100--320 K) in moderate applied magnetic fields $(0.38<H<1.8$ T). For $T>{T}_{c},$ our data can be accounted for by the transport behavior of small polarons.…
The surface insulation resistance (SIR) test has traditionally been performed by taking measurements at certain points during a seven‐day test under well established environmental conditions. The work reported here explores the influence of test temperature and humidity when using a typical resin flux, a weak organic…
X-ray crystal structure analyses of the 4-(4-halobenzylideneamino)TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidyl-1-oxyl) radicals 4-(4-fluorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, 4-(4-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, 4-(4-bromobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-o…
An inclusion complex of plumbagin with β-cyclodextrin was prepared with a view to increasing the aqueous solubility and stability of the drug. The drug complex and the free drug were entrapped in niosomes using a lipid layer hydration method with cholesterol, Span 60 and dicetyl phosphate. The niosomal entrapment effi…
The quasi-living cationic copolymerization of 3,3-bis(chloromethyl)oxetane (BCMO) and ε-caprolactone (ε-CL), using boron trifluoride etherate as catalyst and 1,4-butanediol as coinitiator, was investigated in methylene chloride at 0°C. The resulting hydroxyl-ended copolymers exhibit a narrow molecular weight polydispe…
A new compound in the Lys-HIO(3)-H(2)O system (where Lys = lysine), lysine-iodic acid (1/3), C(6)H(14)N(2)O(2).3HIO(3), has been discovered. Its crystals display nonlinear optical properties. They were investigated by X-ray analysis, IR spectroscopy and NQR methods. The parameters of the unit cell are a = 8.360 (2), b…
The barrier performance and properties (resistivity, crystalline phase and surface microroughness) of tantalum nitride films, as well as the relationship between grain size and diffusivity of copper films, are reported. The resistivity and R a roughness of Ta2N film formed by reactive sputtering using argon and nitrog…
Within the four-particle cluster approximation for the proton ordering model, we study effects of external pressures which do not lower the crystals symmetry on deuterated ferroelectrics and antiferroelectrics of ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4} $ family. The theory provides a satisfactory description of the availa…