Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlantes de Nouvelle-Caledonie, 115. Alcaloïdes Monoterpéniques de Coelospermum billardieriJ. L. Lopez, J. Pusset, and A. San FelicianoCite this: J. Nat. Prod. 1988, 51, 5, 829–835Publication Date (Print):September 1, 1988Publication History Published online1 July 2004Publish…
Abstract Raman spectra of single crystals of the layered compounds SbI 3 and AsI 3 at 15K are reported. Polarization measurements allow the eight principal peaks to be classified according to symmetry species. Results of a group theoretical analysis based on both molecular and ionic descriptions of the crystal structu…
Pharmacologically useful contrast media (CM) must be highly water-soluble to form stable supersaturated solutions. Iohexol and ioxilan both contain centers of potential isomerism stemming from the D,L hydroxyalkyls, the carbamoyl substituents, the alkylated anilide nitrogen and the acetylated anilide. The D,L isomers…
A photodetector that is selective to the polarization, the frequency, and the angle of incident light is presented. Surface plasma modes excited at the surface of a semiconductor–metal–insulator structure provide selective coupling of light into the semiconductor with increased quantum efficiency. Two types of surface…
We report data on tritium permeation at 323 K and 373 K through annealed and single crystal copper for comparison with our earlier data on unannealed copper,1 and show that tritium transport along grain boundaries or other lattice defects controls the overall rate at 323 K in unannealed material. Measurements on unann…
Novel tripyrrane macrocycles have been prepared by the Schiff base condensation of 2,5-bis-(3-ethyl-5-formyl-4-methyl-pyrrol-2-ylmethyl)-3,4-diethylpyrrole and simple diamines. The structurally characterized macrocycle 1 forms 1:1 complexes with both Rh(I) and Zn(II) cations in which the metal is coordinated only to t…
The electro-optical effect of a magnetically biased ferronematic liquid-crystal film is investigated by using birefringence measurements. When a magnetic field is applied, the threshold voltage of the Freedericksz transition no longer exists. The dependence of the birefringence on the magnetic field strength in the lo…
The authors have synthesised molybdenum/copper multilayered films by the alternate deposition of molybdenum and copper metals in an ultra-high vacuum (10 -7 Pa). Sapphire (11.0) and Si(100) were used as the substrates and the substrate temperatures were 40, 80 and 200 degrees C. The films have been characterised by X-…
The novel polymer system made up to the host-guest mixture of poly ( ε -caprolactone) and p-nitroaniline, spontaneously exhibits a large second harmonic generation (SHG) intensity 115 times as large as that of urea, or 3.3 times that of MNA. In addition, this material possesses good mechanical strength and long-term s…
The recently reported memory effects in the ferroelectric commensurate phase of [N(${\mathrm{CH}}_{3}$${)}_{4}$${]}_{2}$${\mathrm{CoCl}}_{4}$ is investigated by means of dielectric susceptibility measurements in other ${A}_{2}$${\mathrm{BX}}_{4}$ compounds. While the effect could also be detected in [N(${\mathrm{CH}}_…
In CaO–Al2O3- and CaF2–CaO–Al2O3-slags the soluted water vapour was quantitatively determined with Fourier-Transform-lnfrared-(FT-IR-)spectroscopy. The slags were equilibrated at 1500 and 1600 °C with definite H2O- and H2O/HF-partial pressures, respectively. The liquid slags were quenched in liquid D2O. They solidifie…
An order parameter describing incommensurate-phase domain-wall (discommensuration) distortions is used to characterize the incommensurate-to-incommensurate phase transition in NbTe4.Received 22 April 1988DOI:https://doi.org/10.1103/PhysRevB.38.4836©1988 American Physical Society
Abstract Chlorination of high density; polyethylene results in polymers which consist of unmodified methylene units and chlorinated methylene co‐units. The effect of the concentration and distribution of chlorinated units on the solid state structure has been examined by thermal, wide angle X‐ray diffraction and dynam…
The stage of growth at which three plant species, a grass, a legume and a cereal, absorbed initially non-exchangeable potassium (Kn) from two soils, a red podzolic and a krasnozem, was examined by sequential harvesting in a glasshouse experiment. Large amounts of Kn were removed from the red podzolic soil, which conta…
A method has been devised for studying the spontaneous polarization, dynamics of polarization reversal, and the molecular reorientation processes that occur in the bulk and surfaces of ferroelectric liquid crystals. These studies have been carried out by analyzing the current response to triangular- and square-wave fo…
Ontario Hydro has developed a computer program called FLOSHEET for simulation of hydrogen isotope and fusion fuel processing systems. The development of the program was initiated to provide support for the commissioning and operation of the Darlington Tritium Removal Facility (DTRF) at Ontario Hydro’s Nuclear Generati…
A.c. and d.c. conductivities of amorphous films of Ge—Sb–Se have been investigated for different Sb: Se ratios, keeping the Ge content constant at 20 at. %. The a.c. conductivity [sgrave](ω, T) in the frequency range 0•5-10•0 kHz is found to obey the law [sgrave](ω, T) = Aω3. The exponent s is found to decrease with i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemisorption on the microsurface of metal clusters: activation barriers and chemical reactions for carbon monoxide, nitrogen, oxygen, and methane on aluminum clusterMartin F. Jarrold and J. Eric. BowerCite this: J. Am. Chem. Soc. 1988, 110, 20, 6706–6716Publication Date (Pr…
The erosion wear and posterosion strength properties of Al 2 O 3 containing 10 vol% ZrO 2 were determined as a function of the kinetic energy of the impacting sharp particles. Samples were prepared with three different surface treatments to obtain different amounts of tetragonal zirconia on the surface. With all three…
Abstract Hydroxy‐interlayered vermiculite (HIV) from a Quartzipsamment, a Haplaquod, and a Paleudult from Florida was studied to determine levels of nonexchangeable K associated with this mineral. Mineralogy was characterized by x‐ray diffractometry (XRD) and thermal analysis. A scanning electron microscope equipped w…