Materials Literature
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P, V, T equations of state were theoretically constructed for the orthorhombic (o-PE) and triclinic modifications of polyethylene (t-PE). Helmholtz free energies A at arbitrary temperatures were calculated for the lattices with various unit cell dimensions. Contribution of the zero-point energy (for T=0 K) as well as…
Abstract Es gelang, vierwertiges Neodym durch Einbau in Wirtsgitter mit Perowskitstruktur zu stabilisieren. Als Wirtsgitter wurden BaCeO 3 , BaPrO 3 , BaThO 3 und BaZrO 3 eingesetzt. Die Präparation erfolgte durch Glühen der entsprechenden Oxide an Luft bei 1 250–1400°C. Röntgenographische und analytische Charakterisi…
By simple steric considerations, we intend to show that the herringbone packing, which is characteristic of the ordered smectic phases, is governed by geometrical factors, contrary to the usually admitted theories which are based on dipolar interactions.
Modern stainless steel melting and refining techniques now make it possible to consider nitrogen as an economic and controllable alloying addition to 18Cr-8Ni austenitic stainless steels. Studies show that nitrogen additions of up to about 0.16 percent to 18Cr-8Ni steels can result in some improved properties. Nitroge…
Abstract Pyrophosphate, oxalate, and HCl‐acetylacetone extractions for Al, Fe, and Si were made on five soils with fragipans (Aeric Fragiaqualfs and an Aquic Fragiudalf) and two soils without fragipans (Aeric Ochraqualfs) from Ohio to evaluate the role of amorphous components in effecting bonding between soil particle…
Photolysis of bisperoxo-molybdenum(VI) porphyrins with a tungsten lamp produces the related cis-dioxomolybdenum(VI) complex.
The vapor pressure of lithium monoxide(Li2O)has been obtained by high temperature mass spectrometry. The partial pressures of Li, O2 and Li2O gaseous molecules have been determined experimentally and several thermodynamic data for the reaction (1)Li2O(s)=2Li(g)+1/2O2 and for the reaction(2)Li2O(s)=Li2O(g)have been cal…
Principal paramagnetic susceptibilities of single crystals of [ML2X2](M = Ni or Co; L = triphenylphosphine; X = Cl or Br) have been measured by the Faraday method throughout the temperature range 20–300 K. The magnetic properties, together with literature spectral data from single crystals and powders, have been inter…
A new type of ligand system is reported which, by means of a rigid support structure, focuses the twenty-four electrons of six attached oxygens on an enforced cavity; the system complexes Li+ and Na+, but rejects other alkali or alkaline earth ions, solvents, and parts of its own support structure.
The formation of the cellulose IV polymorph is generally associated with the production of high-performance rayons. The present paper reviews the structure and properties of cellulose IV, starting from the history of its origin, natural occurrence, and formation during various technological processes of rayon manufact…
This paper deals with an examination of fatigue micromechanisms present in polymers of various chemistry and microstructure. At low stress-intensity (ΔΚ) levels in several amorphous homopolymers, poly (methymethacrylate) (PMMA), polycarbonate (PC), poly (vinyl chloride) (PVC), polystyrene (PS), and polysulfone (PSF),…
Article Theoretical Study of the Trapping and Mobility of Hydrogen Near Vacancies, Dislocations, and Cracks in Nickel* was published on January 1, 1979 in the journal Zeitschrift für Physikalische Chemie (volume 116, issue 116).
The phase diagram of p-cyano-p'-pentylbiphenyl (CPB) and p-pentylbenzoic acid (5BA) shows a maximum value of the nematic-isotropic transition temperature at ∼equimolar concentrations of CPB and the dimer of 5BA (D5BA). Two eutectic points occur at concentrations of D5BA of 8 and 65 mole %, respectively, and an induced…
Abstract Es wurden die Laser‐Raman‐Spektren von ZnTiO 3 und CdTiO 3 aufgenommen und an Hand einer Faktorgruppenanalyse sowie im Vergleich mit den früher untersuchten IR‐Spektren, diskutiert. Die Ergebnisse erlauben eine weitere Einsicht in das schwingungsspektroskopische Verhalten von Doppeloxiden mit Ilmenit‐Struktur.
Interstitial ions, both alkalis and hydrogen, have been shown to play a crucial role in the radiation response of high-quality commercially-available quartz. Electron spin resonance (ESR), infrared absorption (IR), and acoustic loss (Q-1) measurements have been made on various samples, swept and unswept, cut from Sawy…
Cis-polyacetylene films have been synthetized and doped with iodine and antimony penta fluoride, using usual chemical techniques. Doping, leads, after saturation, to conductivity values of about 120 and 25 (Ω cm) -1 at room temperature, respectively for I2 and SbF 5 dopants. The E.S.R. of cis- and trans-, non-doped an…
Les principales configurations des défauts curvilignes des phases smectiques C sont décrites en se référant à deux classifications : celle basée sur le processus de Volterra et celle définie par les classes d'équivalence du premier groupe d'homotopie de la variété des états internes du milieu ordonné. On compare ces d…
The biocompatibility and biodegradability of periodate oxidized cellulose is assessed in vivo. Morophological and histopathological studies over a period of six months indicate that oxidized cellulose degrades slowly without producing excessive tissue reaction. Preliminary investigations on the kinetics of degradation…
The scattering of a two-dimensional Gaussian beam wave by a perfectly conducting or dielectric cylinder centered off both the beam axis and the beam waist is treated by the Fourier-series-expansion method. The incident-beam fields are expanded in a Fourier series with respect to the polar angle in a cylindrical coordi…
A series of hydrogen bonded complexes of pentachlorophenol with various N bases, covering a wide range of ΔpKa values, was investigated using 35Cl n.q.r. The average frequencies of 35Cl n.q.r. of these complexes were compared with those of pentachlorophenol, tetrabutylammonium pentachlorophenolate and tetrabutylammoni…