Materials Literature
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Abstract The photoelectron spectra of TCNE and TCNQ in the gaseous state were measured by stimulating with He I resonance line. The first ionization potential is determined to be 11.77 eV for TCNE and 9.61 eV for TCNQ. The interpretations of the observed photoelectron spectra are carried out with the aids of the photo…
The relative moisture uptake characteristics of ring and open-end yarns are investigated by a variety of methods. Wicking height and volume of moisture elevated differ as the yarn structure is altered. Open-end yarn wicks better and more evenly but only elevates about the same volume of water for a given yarn count as…
The structural consequences of dipolar resonance forms of the pentafulvenes have been studied for 6-(N,N-dimethylamino)pentafulvene (NMEFUL) and 2-formyl-6-(N,N-dimethylamino)pentafulvene (AMFORF). NMEFUL: P2x2121; a=5-872, b= 17-293, c=7.273 A; Z=4. AMFORF: P1; a=9.793, b= 11.971, c= 7.608 A, e= 91-90, fl= 110.03, y=…
Abstract Growth and dissolution rates of nickel sulfate α‐hexahydrate were measured as functions of the concentration driving force in a laboratory‐scale fluidized‐bed crystallizer for the temperature range 35° to 50°C and the crystal size range 0.5 to 4.0 mm. Dissolution rates at a given temperature and crystal size…
Potassium borate glasses of the tetraborate composition, K20.4B203, may be crystallized to give a compound of the composition K20.38B203 or 5K20.19B203. This phase is monoclinic, space group C2/c, with unit-cell dimensions at 22 °C: a = 17.888 _+ 0.002, b = 11.479 _+_ 0-001, c = 12-973 _+ 0-002 A, fl = 95.52 +_ 0.01 °…
Abstract Our overall objective in presenting this review is to call attention to the very complicated nature of the entire disposal problem. The whole field of scrap-tire disposal is full of alternatives, compromises, legislation, and conflicting reports on technological success. We will present a brief historical sec…
The type of recovery behavior to be expected from a previously presented model for fabric bending and creasing is examined. This model consists of a generalized linear viscoelastic element in parallel with a frictional element. The linear viscoelastic element is characterized by the bending relaxation rigidity B( t A…
The distortion of an observed coordination polyhedron can be evaluated from a comparison of this polyhedron with the least-squares best-fit polyhedron with optimum location, orientation, size parameters and prescribed symmetry. A set of atoms at positions, x(1) .... x(n), may be fitted to the set y(1) .... y(n) by rea…
The synthesis of keratin proteins during development of the embryonic chick feather was studied by quantitative gel electrophoresis of the reduced and carboxymethylated proteins. The results demonstrated a coordinated synthesis of the major keratin proteins, during and after the onset of keratin synthesis. The results…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin cobalt porphyrins. VI. Molecular stereochemistry of (1,2-dimethylimidazole)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatocobalt(II)Patrick N. Dwyer, Paul Madura, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1974, 96, 15, 4815–4819Publi…
Abstract The π–π* absorption spectra of p-benzoquinone, α-naphthoquinone, anthraquinone, and their derivatives, mainly in n-heptane up to the vacuum UV region, were obtained. On the other hand, MO calculations of the n-electronic systems of these p-quinones and o-benzoquinone were carried out by means of the P-P-P met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of cobalt porphyrins. III. Structure of 2,3,7,8,12,13,17,18-octaethylporphinato(1-methylimidazole)cobalt(II). Model for deoxycoboglobinRobert G. Little and James A. IbersCite this: J. Am. Chem. Soc. 1974, 96, 14, 4452–4463Publication Date (Print):July 1, 1974…
A model for fuel-coolant interactions is proposed. The interaction is divided into five stages: an initial perturbation which triggers the interaction and causes a vapour bubble to form at the fuel-coolant interface; bubble expansion and collapse with jetting; penetration of the fuel by the liquid jet; heat transfer f…
This book deals with the methods of X-ray production at a level which is accessible to advanced undergraduates and researchers who use X-rays. It also discusses the fundamentals of these physical properties from an experimental viewpoint which is not covered in more specialised texts. The book begins with a survey of…
Abstract The crystal and molecular structure of the complex of amylose with dimethyl sulfoxide has been studied by a combination of stereochemical analysis, potential energy, and X‐ray diffraction methods. The complex crystallizes in a pseudotetragonal unit cell with a = b = 19.17 Å and c (fiber axis) = 24.39 Å, with…
Abstract The 85-residue structure of Chromatium high potential iron protein (HiPIP) has been determined by x-ray diffraction methods at 2.0 A resolution, and is currently undergoing crystallographic refinement. The partially refined HiPIP structure reported here has an R factor of 0.24. Moreover, bond distances and an…
Abstract The cell factor that is involved in tumor-associated fibrinolysis has been partially purified from the supernatant fluid of transformed chicken embryo fibroblast cultures. It is an arginine-specific protease that acts as a plasminogen activator. The molecular weight is approximately 39,000, and the irreversib…
Five species of Azollopsis Hall, 1968, are described from strata of Campanian to Paleocene age. The spores were recovered from the Belly River and Edmonton Groups of central Alberta, Canada.The genus Azollopsis is emended to include forms with circinate glochidia. Two subgenera, Spiralopsis subg. nov. and Azollopsis s…
Messung des Dampfdrucks über flüssigem Calcium durch Siedepunktbestimmung bei verschiedenen Drücken im Temperaturbereich 900 bis 1375 °C. Angabe von Gleichungen für die Dampfdruckkurve unter Berücksichtigung der Temperaturabhängigkeit der Verdampfungswärme. Erörterung der Schrifttumsergebnisse von Dampfdruckmessungen…
Using a 40 cm curved crystal spectrograph of the transmission (Cauchois) type the chemical shifts in the X-ray K absorption edge of copper in a number of copper compounds has been measured. In all the compounds investigated the K absorption discontinuity is found to shift towards the high energy side relative to the p…