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A complete line shape analysis of the dynamic NMR spectra of cyclo-octatetraene dissolved in nematic liquid crystalline solvents is presented. The analysis involves simulation of the dynamic NMR spectra in the presence of the bond shift reaction. This is performed using a newly developed group theoretical method. Comp…
Band-gap narrowing has been measured optically for semiconducting zinc-oxide films. All films were $n$ type with carrier densities of 5 \ifmmode\times\else\texttimes\fi{} ${10}^{17}$ - 2 \ifmmode\times\else\texttimes\fi{} ${10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. The narrowing appeared suddenly at $n\ensuremath{\…
Excitations of the oxygen $1s$ subshell in selected $3d$ transition-metal oxides have been studied by inelastic scattering of 75-keV electrons. Striking variations in the near-edge fine structure are reported and an interpretation is developed based on an empirical molecular orbital energy-level model. We compare our…
In natural ecosystems, microbial activity is often associated with the presence of a surface, particularly in low-nutrient environments. The chemostat allows the study of such low-nutrient environments together with the precise control of other growth parameters. By using this system, enrichment cultures with inocula…
Diffraction investigations on single crystals of the system Mn1-xCrxSb (0<or=x<or=1) are reported. The NiAs-type structure is maintained for the whole composition range. Single crystals were grown by the Bridgman-Stockbarger method. The site occupancies were characterised by combined X-ray and neutron diffraction inve…
Abstract Die Zähigkeit des Polyethylens bei Schlagbeanspruchung wird unter Anwendung bruchmechanischer Methoden analysiert. Die kritische Energiefreisetzungsrate G IC oder kritische spezifische Bruchenergie wird mittels Schlagbiegeversuchen an gekerbten Probekörpern in Abhängigkeit von strukturellen Parametern bestimm…
Direct spherical agglomeration of salicylic acid crystals during crystallization is described. The needle-like salicylic acid crystals simultaneously form and agglomerate in a mixture of three partially miscible liquids, such as water, ethanol, and chloroform, with agitation. The agglomerates can be made directly into…
Investigations on RF sputtered NiCr thin film resistors, fabricated using Cu as conductor metallization, were made. The contact resistance characteristics, resistor film characteristics and TCR of the resistors were measured. The effect of heat treatment on the resistor characteristics was studied. A suitable annealin…
This paper reports an experimental investigation of the breakdown phenomenon of three types of synthetic insulating materials namely polystrene, polyvinyl chloride and teflon. The investigations of breakdown phenomenon of these materials are conducted on square sheets, each of 0.5 mm thickness and 10 cm on side, immer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and magnetism of monomeric chlorobis(N-(2-phenylethyl)salicylideniminato)iron(III), Fe(SANE)2ClCharles J. Magurany and Charles E. StrouseCite this: Inorg. Chem. 1982, 21, 6, 2348–2350Publication Date (Print):June 1, 1982Publication History Published online1 May 200…
Abstract The process of determining the overlapping peaks in complex X‐ray photoelectron spectra of polymer surfaces is posed mathematically as an inverse problem whose solution can be reduced to a standard least‐squares procedure. Various models can be generated by assuming specific forms for the distribution of effe…
Abstract Vinyl chloride‐ethylene copolymers containing from 1.0 to 5.5 wt.% ethylene were synthesized and compounded with DOP plasticizer at levels of 0, 5, 10, 20, 30, and 40 parts per hundred parts of resin. Physical property tests indicated that, as an internal plasticizer, ethylene was 2 to 3 times more efficient…
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An investigation has been made of the feasibility of grading an electric field by means of electrically active particulate fillers in polymeric matrix materials. Concepts investigated included linear resistive, nonlinear resistive and capacitive grading. This paper describes the design, fabrication and electrical eval…
Abstract PVC is a notch‐sensitive polymer. The drop weight impact strength is also lost dramatically below 0°C. This requires special formulation considerations for critical applications. The general trend is to use polymeric impact modifiers, which are rubbery, graft polymers or blends of both hard and rubbery materi…
Abstract The paper presents the first experimental results of the equation of state and its derivatives such as isothermal compressibility, thermal expansion coefficient and thermal pressure coefficient for fluid sulphur which extend over the entire liquid‐vapour range, including the supercritical region up to 1200°C…
Abstract UF 6 , UF 5 and UF 4 have been studied by X‐ray photoelectron spectroscopy. U 4f 7/2 binding energies for these compounds were observed to be 384.9, 383.4 and 382.3 eV, respectively. The corresponding U 4f 5/2 energies were 395.7, 394.2 and 393.2 eV. Solid UF 6 was formed by condensation of a molecular beam o…
Abstract The red, diamagnetic complex [Mo(NO)(terpy)(CN)(HNO)] • 2H 2 O crystallizes in the triclinic space group P1̅(C 1 i -No2) with cell constants a = 867.1(3), b = 1008.4(4), c = 1095.6(3) pm, a = 73.64(3)°, β = 83.54(3)°, γ = 83.16(3)°, and Z = 2. The final R value of the single crystal X-ray analysis is 0.063 fo…
The temperature dependence of the generalized order parameter, namely the rotation angle of the Nb${\mathrm{O}}_{6}$ octahedron, at the antiferrodistortive transition in the perovskite crystal NaNb${\mathrm{O}}_{3}$, is derived through the high-resolution analysis of the second-order quadrupole shift of $^{23}\mathrm{…
Abstract The influence of the degree of polymerization (DP) of cellulose was evaluated in the preparation of micron‐sized cellulose IV II lamellar crystals in order to ascertain whether a regular chain‐folded morphology could develop during their growth. For this purpose, sharp fractions of cellulose acetate were coll…