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The infrared spectra (200–4000 cm −1 ) of 2-thiopyrrole-1,2-dicarboximide (TPH) in solid and solution forms have been measured as a function of temperature, and a direct correlation has been obtained between the two phases and the type and extent of hydrogen bonding. It is suggested that TPH exists as cyclic dimer in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA model for the surface tension of molten alkali halidesKunimitsu Yajima, Hirotake Moriyama, and Jun OishiCite this: J. Phys. Chem. 1984, 88, 19, 4390–4394Publication Date (Print):September 1, 1984Publication History Published online1 May 2002Published inissue 1 September 19…
Tribological properties of five glass‐ceramics are reported. The materials were tested unlubricated against themselves. Testing was performed using a simulated inertial sample dynamometer. Sliding speeds were between 0.5 and 1.8 m /S with an applied load of 225 N. Average friction coefficients were in the range 0.07 t…
Abstract An iterative procedure for evaluation of the Mark–Houwink constants, using the GPC universal calibration principle and the extended [η]– M relationship, is described. The procedure is recommended for newly prepared polymers of unknown average molecular weights. An example is given for bisphenol C‐2 polycarbon…
Eddy current losses under large flux excitation in Mn-Zn ferrite cores and both polycrystalline and amorphous metallic cape cores of thickness 4μm to 28μm are measured in the frequency range up to 1MHz. Beyond 100kHz, the complex behaviors of magnetization in metallic cores as seen in the lower frequency range disappe…
We have devised a residue-residue potential function for low resolution protein conformational calculations. The interactions between residues near in sequence maintain correct secondary structure, while the long-range terms in the potential govern the larger packing features and overall globularity. The short-range t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman scattering for redox-active adsorbents: pentaammineosmium(III)/(II) and pentaammineruthenium(II) containing nitrogen heterocycle ligandsStuart Farquharson, Kendall L. Guyer, Peter A. Lay, Roy H. Magnuson, and Michael J. WeaverCite this: J. Am. Chem. So…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew developments in heterocyclic silyl enol ether chemistry: synthesis and Lewis acid-mediated reactions with carbon electrophiles of 2,5-bis(trimethylsiloxy)thiopene and 1-methyl-2,5-bis(trimethylsiloxy)pyrroleLuisa Lozzi, Alfredo Ricci, and Maurizio TaddeiCite this: J. Org…
The solution of the electrode and pole piece reconstruction problem is given. The axial potential or flux density distribution is sought in the form of a simple curve with a continuous second derivative. The reconstruction procedure then is extremely simple and quite accurate. As an example the electrode system for an…
Etude de la formulation, de la fabrication et des performances d'adhesifs phenol-resorcinol-formaldehyde pour lamelles colles
Abstract The morphology, genesis, and classification of three soils, each located on different physiographic positions, were investigated in southern Iran. These soils were: pedon 1, Beyza series on the Piedmont Alluvial Plain; pedon 2, Takht‐E‐Jamshid (Persepolis) series on the Upland Alluvial Plain; and pedon 3, Koo…
Apart from the high tenacity and modulus of elasticity, aramid based on paraphenylene terephthalamide also has very favorable temperature properties. These include high temperature resistance, nonflammability, and absence of heat shrinkage. Another advantage lies in its high chemical resistance. Compared with asbestos…
Dislocation motion in single crystals of the II-VI compounds (MS, (dSe, Zn() (wurtzite structure) and CdTe (zineblende structure) has been observed in silu by transmission electron microscopy at room temperature. Several common features are found. (1) The microscopic motion of dislocations is generally steady and cont…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordinative interactions in chelated complexes of silicon. 13. Experimental determination of the electron deformation density of a pentacoordinated silicon complexG. Klebe, J. W. Bats, and H. FuessCite this: J. Am. Chem. Soc. 1984, 106, 18, 5202–5208Publication Date (Print)…
Measurements are reported on the magnetostatic and dielectric resonances of samples of barium hexaferrite single crystals in the millimeter wavelength range. The behavior of these resonances versus frequency and temperature leads to the conclusion that the contribution of the intrinsic loss to the FMR linewidth is abo…
In 6.5wt% silicon-iron ribbons prepared by a rapid quenching roll method, grains of 10μm in diameter were observed to grow from surfaces to the inner part of ribbons. When the annealing temperature was about 700°C, the primary recrystallization was observed near the middle of the ribbon thickness, and at the annealing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,3-Adamantane-3,13-porphyrin-6,6-cyclophane: crystal structure of the free base and steric effects on ligation of the iron(II) complexT. G. Traylor, N. Koga, L. A. Deardurff, Paul N. Swepston, and James A. IbersCite this: J. Am. Chem. Soc. 1984, 106, 18, 5132–5143Publicatio…
Acoustic-phonon dispersion relations of black phosphorus in its orthorhombic $A11$ phase have been measured along three principal directions mainly at 1 bar and 15.4 kbar. An anomalous softening has been observed on the LA[100] branch whose vibrational patterns (eigenvectors) have been analyzed based on a force-consta…
This paper discuses the stress corrosion cracking observed when slow strain rate tests were run on AISI 304 stainless steel specimens in oxygenated 288 C water. Transgranular, intergranular, and granulated stress corrosion cracks were observed. The type of cracking observed was a function of the degree to which the sp…
A c-axis alexandrite laser rod was longitudinally pumped in the 450–560 nm region with argon ion and dye lasers. In addition to the sharp R lines and broadband phonon-assisted transitions typical of mirror site Cr3+ ions in alexandrite, room temperature fluorescence spectra displayed characteristics in the 690–730 nm…