Materials Literature
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The chemical steps of the Si and SiC deposition from DCS/H2 and MTS/H2 respectively, are approached on the basis of a calculation of the homogeneous equilibria. SiCl2 appears to be a major intermediate species in both cases. Supersaturation is found to be very high particularly at low temperature. A calculation of the…
New phenomenology of the chiral nematic (N), smectic-A (A), ferroelectric smectic-C (C) point (NAC) is reported in a binary mixture of two chiral components. We find a tricritical point on the AC phase-transition line which is displaced from the NAC point, and an NA line which is first order. At the NAC point all thre…
Abstract The morphology of polyamide 12 and polyether block amide blends was investigated by electron microscopy and dynamic mechanical techniques. The blends are not miscible, and phase segregation is observed. In each phase, the lamellar structure of the pure components is observed. The stability of these micro phas…
Abstract The IR emission and the corresponding low energy excitation spectra of the wide band gap semimagnetic semiconductors Zn 1− x Mn x Te, Cd 1− x Mn x Te, Zn 1− x Mn x Se, Cd 1− x Mn x Se, Zn 1− x Mn x S, and Cd 1− x Mn x S are critically discussed in the light of the models proposed until now. The similar shape…
The pE194 replication origin was localized to a 265-base-pair interval by analyzing the ability of purified pE194 restriction fragments to direct replication of heterologous plasmids. Replication was dependent upon RepF protein supplied in trans. The origin region contained a GC-rich dyad symmetry which may serve as t…
A measuring procedure has been developed to determine the hysteresis loss as function of the magnetizing frequency. It was applied to single crystal frames of iron-silicon and tape wound cores of that alloy and metallic glasses. Actually the hysteresis loss energy is frequency dependent and to an extent that must not…
The magnetic characteristics of two representatives of martensitic and one of ferritic stainless steels, i.e. SUS 403, TAF, and SUS 405, were investigated in connection with development of high-temperature and nuclear resistive sensors. The test pieces were machined out from rod materials and heat-treated in an argon…
Sterilization of bioreactor media, to destroy viability of the indigenous microbial population, is normally accomplished by autoclaving, or heating with pressurized steam. However, simultaneous chemical changes in media can also be expected to result from the high temperatures. A kinetic procedure involving on-line co…
Oligomerization of mono- and oligosaccharide units can be an interesting methodology for synthesis of homooligosaccharides and oligosaccharides having repeating units, respectively. Recently, chitooligosaccharides, especially the hexamer, were shown to have an antitumor effect,2 suppress metastasis3 and protect agains…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron-transfer processes in the electrophilic cleavage of cobalt-carbon bonds of alkylcobalt(III) complexes with iodineKunio Ishikawa, Shunichi Fukuzumi, and Toshio TanakaCite this: Inorg. Chem. 1989, 28, 9, 1661–1665Publication Date (Print):May 1, 1989Publication History…
Hydrophilic sulfur sols prepared by reaction of aqueous sulfide and sulfite at low pH have been studied by chemical analysis, ion-pair chromatography, and reversed-phase HPLC. The approximate composition of the sol is x(NaHSO 4 /Na 2 SO 4 ) ·yS n · zNa 2 S m O 6 with n = 6-10 and m = 4-16. The elemental sulfur S n acc…
The sonolysis of argon-saturated aqueous solutions of sodium acetate, sodium propionate, amino acids, and sugars was investigated by ESR and spin trapping over a large range of concentrations. The spin trap 3,5-dibromo-2,6-dideutero-4-nitrosobenzene sulfonate was used to examine the possibility of detecting new radica…
Hydrogenated amorphous carbon layers (a-C:H) formed by plasma deposition on silicon and germanium substrates have been depth profiled by 5-keV Ar+ sputtering and analyzed with Auger and photoelectron spectroscopy, secondary ion and secondary neutral mass spectroscopy. Reference data have been established for quantitat…
TeO x films containing Ge, Sn or Pd were prepared for application in optical recording media by electron-beam coevaporation of Te, TeO 2 and additional elements. Since these films exhibited large differences in optical constants between the amorphous and crystalline states, they are thought to be potentially useful fo…
Application d'une methode basee sur celle de Galerkin pour la resolution de problemes de thermoelasticite couplee bi- et tri-dimensionnelle
New equations for the derivatives of molecular dipole moments and polarizabilities with respect to nuclear coordinates are derived in terms of nonlocal polarizability densities, linear and nonlinear. New equations are also derived for the electric field shielding tensors at nuclei of molecules in static external field…
Thermomagnetic heat engines that convert thermal energy into mechanical energy are described. These heat engines utilize the thermomagnetic effect which is a property of ferromagnetic materials whereby their magnetization changes with temperature. A computer model is developed from which the performance of the device…
We have investigated spirality in both dry and fully relaxed jersey fabrics produced from a series of relaxed spun yams. From this study, it is clear that spirality depends on feed density, machine cut, and loop shape, but the magnitude of spirality can be offset by the selection of yarn twist direction. In addition,…
The formation of inhomogeneous distributions of vacancy loops in irradiated materials is discussed in the framework of a dynamical model based on the rate theory of radiation damage. Dislocation structures are associated with dynamical instabilities due to the competition between defect motion and interactions. The de…
Abstract Surface excesses of the bivalent ions Ca 2+ , Mg 2+ , and SO 2‐ 4 were measured on a Brazilian Oxisol suspended in Ca(ClO 4 ) 2 ), Mg(ClO4) 2 , or Li 2 SO 4 solution. The surface excess of Ca 2+ increased proportionally with pH in the range 2.5 to 6.0 and was independent of ionic strength in the range 26 to 6…