Photodepression in As–S thin films
A small depression (about 80 Å) was observed when As–S thin films were exposed to a xenon 500-W lamp. The depression is considered to be a structural change in amorphous As–S.
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Optimization of alkyl modifications by Fibonacci search
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptimization of alkyl modifications by Fibonacci searchThomas M. BustardCite this: J. Med. Chem. 1974, 17, 7, 777–778Publication Date (Print):July 1, 1974Publication History Published online1 May 2002Published inissue 1 July 1974https://pubs.acs.org/doi/10.1021/jm00253a033ht…
Parent Material of Upper‐ and Middle‐Coastal‐Plain Soils in North Carolina
Abstract In the upper‐ and middle‐Coastal Plain of North Carolina, Paleudults are on the old landscapes; Hapludults, with low base status, are on the young valley side slopes. This distribution of soils suggests a parent‐material control of soil development. X‐ray and petrographic analyses of samples of the surficial…
Prediction of the viscosities of ""soda-lime"" silica glasses
Publis he d data a re used to deve lop fa c tors for predic ti ng the viscos it y-te mpe rature re la tion s hip from th e compos iti ons of "soda-lim e" t ype silicate glasses at s pec ifi c t e mpe ratures in th e range of 600 t o 1300 0c. Th e effec ts of Na2 0. K, O . CaO. MgO. AI, O" an d th eir int e rac tion s…
The glass transition temperature of monodispersed polystyrenes and their binary mixtures
GJas s transition mea s urem e nts on monodi spersed polystyre ne s of diffe re nt molec ular we ight a nd their binary mixtures res ult in th e following co nclu sions: (a) th e effect of molec ular we ight on th e gJa ss tran s iti ons of monodispe rsed sa mpl es sa tisfies th e F ox and Flory e quation writt e n as…
Effects of structure on properties of some new aromatic‐aliphatic polybenzimidazoles
Abstract Polybenzimidazoles were prepared in poly(phosphoric acid) from isophthalic, m ‐ and p ‐phenylene diacetic, succinic, adipic, suberic, and sebacic acids and 3,3′‐diaminobenzidine, 3,3′,4,4′‐tetraaminodiphenyl ether and 3,3′,4,4′‐tetraaminodiphenylmethane. The thermal, mechanical, and bonding properties were st…
PHOTOELECTRON SPECTRA OF TETRACYANOETHYLENE(TCNE) AND TETRACYANOQUINODIMETHANE(TCNQ)
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…
A Comparison of the Performance of Open-End and Ring Spun Yarns in Terry Toweling
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 structure of 6-(N,N-dimethylamino)pentafulvene and 2-formyl-6-(N,N-dimethylamino)pentafulvene. Bond length evidence for dipolar resonance forms
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=…
Growth of nickel sulfate in a laboratory‐scale fluidized‐bed crystallizer
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…
The crystal structure of pentapotassium enneakaidekaborate, 5K2O.19B2O3
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 °…
Scrap Tire Disposal
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…
A Model for the Crease Recovery of Fabrics
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…
A method of determining the distortion of coordination polyhedra
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…
KERATIN SYNTHESIS DURING DEVELOPMENT OF THE EMBRYONIC CHICK FEATHER
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…
Stereochemistry of low-spin cobalt porphyrins. VI. Molecular stereochemistry of (1,2-dimethylimidazole)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatocobalt(II)
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…
Studies of the π–π* Absorption Bands of p-Quinones and o-Benzoquinone
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…
Stereochemistry of cobalt porphyrins. III. Structure of 2,3,7,8,12,13,17,18-octaethylporphinato(1-methylimidazole)cobalt(II). Model for deoxycoboglobin
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
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…
X rays in Atomic and Nuclear Physics
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…