Materials Literature
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The changes in mechanical properties of several polymers induced by high energy protons (10, 30 and 45 MeV protons) were studied and compared with those induced by 2 MeV electrons and Co-60 gamma rays. Changes in elongation at break showed the same trends for 10 MeV proton and electron irradiations in the case of both…
Chain transfer to monomer during the free-radical polymerization of vinyl chloride is shown to occur, in part, by a mechanism that begins with the abstraction of methylene hydrogen from the polymer by a propagating macroradical The resultant radical then donates a chlorine atom to the monomer to form an allylic struct…
A copper(I)-templated synthesis furnishes rotaxanes, in which porphyrin subunits serve as bridges and bulky stoppers and the threaded rings contain chelating phenanthroline groups. A [5]rotaxane is shown schematically on the right, ○ = CuI, thick lines = phenanthroline units, ⋄ = porphyrins.
Either a metal atom or the phthalocyanine ligand is the site of the first oxidation of the heteronuclear triple-decker complexes of type 1, depending on whether they contain an oxidizable CeIII ion or not. Now the first X-ray structure of such a heteronuclear triple-decker complex (1, M Ce, M′ Gd, p oep) has als…
Eine richtige Doppelbindung zwischen den beiden Imidazol‐2‐yliden‐Hälften kennzeichnet das bei Raumtemperatur stabile Tetraazafulvalen 1 , dessen Dissoziation zu 1 ′ nicht nachzuweisen ist, obwohl die Bindungsstärke auf nur wenige kcal mol −1 geschätzt wird. Diese stimmt gut mit theoretischen Vorhersagen überein, die…
Molecular electronics—the storage and processing of data on individual molecules—may be one path toward increased storage density and speed. In his Perspective, Verdaguer discusses work reported by Sato et al. ( p. 704 ) in this issue on light-induced changes in the magnetic properties of various preparations of Pruss…
The melting curve for MgO was obtained using molecular dynamics and a non-empirical, many-body potential. We also studied premelting effects by computing the dynamical structure factor in the crystal on approach to melting. The melting curve simulations were performed with periodic boundary conditions with cells up to…
Photoinduced magnetization was observed in a Prussian blue analog, K0.2Co1.4- [Fe(CN)6]·6.9H2O. An increase in the critical temperature from 16 to 19 kelvin was observed as a result of red light illumination. Moreover, the magnetization in the ferrimagnetic region below 16 kelvin was substantially increased aft…
Changes in free energy, enthalpy, and entropy were determined for sorption (desorption and adsorption) of water in wood. Findings were that changes are different for desorption and adsorption, have a strong dependence on moisture content, and have a weak dependence on temperature. Suggestive explanations are given for…
Radical copolymerization of styrene and maleic anhydride have been carried out in N, N-dimethylformamide at 60°C using 2,2′-azobisisobutyronitrile as initiator. The copolymer compositions were determined using an aqueous conductometric direct titration method. Monomer reactivity ratios were calculated by Fineman-Ross,…
In an effort to understand interparticle charge transfer processes, the authors study the effect of TiO{sub 2} particles in the vicinity of CdS particles on the emission from the latter. Quantum-size CdS particles were capped with the bifunctional bridging molecules mercaptocarboxylic acids (HS-(CH{sub 2}){sub n}-CO{s…
The mandated switch from CFC-11 (trichlorofluoromethane) to HCFC-141b (1,1-dichloro-1-fluoroethane) as a blowing agent for polyisocyanurate insulation foams has required producers of these foams to make numerous formulation changes. The changes have been warranted due to the differing physical properties of HCFC-141b…
The crystallographic databases are powerful and cost-effective tools for solving materials identification problems, both individually and in combination. Examples of the conventional and unconventional use of the databases in solving practical problems involving organic, coordination, and inorganic compounds are provi…
In this paper, an equivalent network model for transformer analysis including hysteretic effects is presented. The nonlinear electromagnetic problem is reduced to the analysis of an equivalent network by integrating Ohm's law inside every elementary volume into which the solid bodies of the examined system are subdivi…
RATIONALE AND OBJECTIVES: The authors investigate the frequency of sister chromatid exchange (SCE) after the addition of gadolinium (Gd)-DTPA to venous blood samples. METHODS: Venous blood was obtained from nonsmokers. Samples were incubated with Gd-DTPA alone or in combination with mitomycin C, cytarabine, and dimeth…
The structural modifications and orientational ordering of nematic (SCB) droplets with the bipolar director-field configuration, embedded in a uniaxially stretched polyvinyl alcohol (PVA) matrix, are studied using polarized optical microscopy. It has been found that the unidirectional ordering of droplets with stretch…
Grain boundary diffusion of Cr in [10]/[112] symmetrical bcc bicrystals of Nb has been investigated in the temperature range from 950 to 1197°C with tilt angles, θ, from 2 to 21°. For 0·17°, the activation energy is independent of θ, with an average value of 181-2kJ mol−1, which is about half of the activation energy…
A void‐free SiO 2 interlayer dielectric film formation technology has been developed. This technology utilizes tetraethylorthosilicate [TEOS, Si ( OC 2 H 5 ) 4 ]/ozone ( O 3 ) atmospheric pressure chemical vapor deposition (APCVD) SiO 2 film gap‐filling, and the TEOS‐based dual frequency plasma enhanced vapor depositi…
Abstract Relaxation of pulsed photocurrents under optical bias is studied in amorphous films of ternary glassy alloys As 2 Se 3 :Sn x ( x = 0 to 3.5 at%) and (1− y )(As 2 S 3 ): y (Sb 2 S 3 ) ( y = 0 to 0.55) by the time‐of‐flight technique. In the frame of a multiple‐trapping model it is shown that by adding tin and…
In order to conduct valid epidemiological studies of nuclear power plant workers, good information on the workers' radiation dose histories is essential. Dose records held by a major dosimetry service company and on the Nuclear Regulatory Commission's Radiation Exposure Information and Recording System have been compa…