Materials Literature
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Data have been collected from a standard silicon sample with Cu Kβ radiation selected by means of a pyrolytic graphite monochromator mounted in the scattered beam. The peak shapes can be described reasonably well by Lorentz-type functions, but not by a Gaussian function. These results have been applied to the profile…
We show that evaporated tungsten trioxide amorphous layers commonly used in electrochromic displays actually have the composition WO2.7Hy (0.2<y<0.5). We emphasize that coloration of virgin transparent films can be obtained without injection of any external ion into the layer, and further that around a c…
Abstract Heat precipitation fibril formation in collagen solutions depends upon the prior thermal history of the solution. Collagen solutions were heat precipitated to various extents at 30°C, cooled, and then brought to a second precipitation. Kinetic analysis of the secondary precipitation demonstrated that only the…
The more-than-linear increase of elastic modulus with draw ratio, the gradual disappearance of meridional SAXS maximum, the drastic drop of elastic modulus after annealing and its recovery upon standing at room temperature if the sample was annealed with fixed ends so that it did not shrink, and the shape stability of…
Exchange interaction in ring chains of N transition ions with n unpaired electrons per ion is investigated. The study is focused on the case where N becomes very great, i.e. on the case of one-dimensional magnetic compounds. The main results are the following: (i) An orbital justification to the use of the phenomenolo…
Abstract X-Ray crystal structure analyses of [(C4H9)4N]2[Ni(mnt)2] (I) and [(C2H5)4N][Ni(mnt)2] (II) {mnt: 1,2-dicyanovinylene-1,2-dithiolato C4N2S22−} have been carried out from the viewpoint of one-dimensional system. Crystals of (I) belong to triclinic system: a=12.360(6), b=11.138(12), c=9.833(9) Å, α=118.43(9), β…
The magnetoelastic properties of the ferromagnetic cubic compounds of heavy rare earths with zinc ($R\mathrm{Zn}$) are investigated. Lattice distortions occuring below the ordering point are particularly strong when tetragonal: For instance, DyZn exhibits at low temperature a spontaneous tetragonal strain expressed as…
Calculated probabilities of bend formation in 47 amino acid sequences of N-acetyl-N'-methylamide dipeptides, determined from a statistical mechanical analysis using empirical conformational energies, were compared with the observed fraction of bends formed in the same 47 dipeptide sequences in the x-ray structures of…
Abstract In the subambient thermal volatilization analysis (TVA) technique, degradation products initially at −196°C are allowed to warm up to ambient temperature in a controlled manner under vacuum conditions, and volatilization from the sample tube to a trap at −196°C is monitored by means of a Pirani gauge. The tec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA nucleophilic acetaldehyde equivalent. Preparation and synthetic applications of cis-2-ethoxyvinyllithiumRobert H. Wollenberg, Kim F. Albizati, and Rohan PeriesCite this: J. Am. Chem. Soc. 1977, 99, 22, 7365–7367Publication Date (Print):October 1, 1977Publication History Pu…
Escherichia coli cells prepared for transformation by treatment with cold 0.1 M CaCl2 remained viable and competent after storage at -82 degrees C in 15% glycerol; thawed-cell samples yielded up to 10(6) transformants per microgram of plasmid deoxyribonucleic acid.
Switching and oscillation were found in SnO2-VOx-PdO ceramics. This switching does not appear above 60°C. However, under 40°C, it comprises two switching actions and depends upon the ambient temperature. The oscillation is irregular and the amplitude is as great as 30−40 V at room temperature.
The dielectric behavior of triglycine sulphate has been investigated near the phase-transition temperature for varying thicknesses of the crystal. Measurements have been carried out at a frequency of 1 kHz. The results indicate that the dielectric constant of triglycine sulphate does not go to infinity at the transiti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and studies of trimethylamine adducts with tin(II) halidesC. C. Hsu and R. A. GeanangelCite this: Inorg. Chem. 1977, 16, 10, 2529–2534Publication Date (Print):October 1, 1977Publication History Published online1 May 2002Published inissue 1 October 1977https://pubs.…
An octahedral multi-anvil apparatus has been developed for the study of X-ray diffraction under high pressure. High pressures up to 150 kbar can be generated in the centre of split cones when they move together as external load is applied upon the outer surfaces. The X-ray beam is focused to the specimen through a hor…
A polymethyl methacrylate insulator rod in vacuum is stressed by high-voltage pulses having 3-ns rise times, with the result that 40-mm-long incomplete discharges occur at the end of the rod. Time-resolved measurements of electron emission from different areas on the insulator surface indicate that a discharge propaga…
The photoelectron spectra of PbCl 2 , PbBr 2 and SnCl 2 , which have the lead chloride-type crystal structure, have been measured with X-rays and extreme ultraviolet rays in order to investigate the electronic structures of their valence bands. The photoelectron spectra of TlCl and Pbl 2 have also been measured for co…
The dielectric properties of polydimethylsiloxane fluids have been investigated under dc and ac fields as a function of field, frequency, temperature, and water content. The results of the ac studies have shown that the dielectric constant and dielectric loss of the fluid exhibit several transitions as a function of t…
A scaling theory is proposed for solids under hydrostatic pressures which do not undergo structural phase transitions or symmetry distortions or for which distortions may be neglected. The theory is tested with two adjustable parameters by computing the linear frequency shifts (dν/dP) for the optical transitions 4A2(F…
A development of a conic fitting procedure is described which enables the X-ray source point in Kossel diffraction to be determined solely by analysis of shadows cast on the recording film and so dispenses, in subsequent analysis of the pattern, with the need to have prior knowledge of the crystal structure of the spe…