Materials Literature
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Research into plugging and related processes, such as punching and blanking, is briefly reviewed and discussed with emphasis on understanding thephysical aspects of the process and its mechanical description. Based on progress in the study of thermoplastic shear instability, a mechanical model isproposed which concent…
Photochromic polymers containing p-phenylazoacrylanilide were synthesized and the photo-induced hydrophobicity change on the surface of the polymer film was studied by measuring water wettability. The wettability increased with UV irradiation and returned to the original value with visible light irradiation. This phot…
Abstract The usual method of studying thermal degradation mechanisms of polymers in vacuo is to use electron ionization pyrolysis mass spectrometry. This can lead to mass spectral fragmentation from the 70 eV electrons used. Low energy electrons (10–15 eV) produce a low abundance of positive ions. However, if a molecu…
A theoretical analysis of the order parameter and temperature dependence of the complete set of five independent viscosities of incompressible nematic liquid crystals is presented. It is an extension of a previous theory by the authors on the thermal dependence of the twist viscosity in nematics (Port. Phys. 9 (1975)…
Exposure of MgAl2O4 crystals to 137Cs γ rays produces a broad absorption complex centered near 3 eV and at the same time destroys absorption at 4.8 and 6.4 eV which is attributed to charge transfer transitions on octahedral Fe3+ impurity ions. Thermal and optical bleaching of the 3-eV absorption complex in crystals wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplicability of the Solomon-Bloembergen equation to the study of paramagnetic transition metal-water complexes. An ab initio SCF-MO studyLars Nordenskiold, Aatto Laaksonen, and Jozef KowalewskiCite this: J. Am. Chem. Soc. 1982, 104, 2, 379–382Publication Date (Print):Januar…
This book contains the papers and discussions from the symposium, "PARTICU LATE CARBON: Atmospheric Life Cycle," held at the General Motors Research Laboratories on October 13-14, 1980. This symposium
We have measured cross sections for the production of isotopes of Bk through No in bombardments of $^{248}\mathrm{Cm}$ with $^{16}\mathrm{O}$, $^{18}\mathrm{O}$, $^{20}\mathrm{Ne}$, and $^{22}\mathrm{Ne}$ ions at energies near the Coulomb barrier. In general, the peak of the mass-yield curve for each element is about…
A detailed study of the reductive dissolution of NiFe2O4 by V(pic)–3 is reported. The kinetics of the reaction follow a cubic rate law and exhibit a first-order dependence on [VII], indicating that the rate-determining step involves attack by V(pic)–3 on FeIII ions at the oxide surface. Dependences on [H+] and [free p…
The electrochemical oxidation of NiL2+ (where L = meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) in aqueous solutions in the presence of sulfate, phosphate, chloride, and phthalate yields NiIIILX2. The stability constants for the axial coordination of the anions X are estimated from the observed red…
The annealing out of quenched-in vacancies has been studied, by transmission electron microscopy, in an ordered B2 type Fe-42 at.% Al single crystal. Slices of 〈111〉 and 〈001〉 orientation were quenched from 1000deg;C and annealed at 400deg;C for various times. In situ annealing has also been performed in a high-voltag…
EPR and electrical conductivity measurements under controlled thermal cycles demonstrate that a phase transition is occurring at about 22 K in (TMTSF)2ClO4. Slow cooling (12 K/h) yields a stable ground state exhibiting Pauli paramagnetism above and superconductivity below 1.2 K. In contrast, fast cooling (30 K/min.) y…
Ion implantation can be used to introduce network damage and to alter the chemical composition in glasses. Structural changes can be inferred from IR measurements near 1000 cm−1 and by optical absorption near 2150 Å. Implantation-induced damage decreases the implanted volume in fused silica with consequent changes in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical control of the internal Michael reaction. A new construction of trans-hydrindan systemsGilbert Stork, Christopher S. Shiner, and Jeffrey D. WinklerCite this: J. Am. Chem. Soc. 1982, 104, 1, 310–312Publication Date (Print):January 1, 1982Publication History Pub…
This paper seeks to update previous reviews of the effects of ionizing radiation on amorphous insulators. The electronic and atomic structures of radiation-induced defect centers (trapped electrons or holes) are discussed primarily in terms of data deriving from the technique of electron spin resonance. Emphasis is pl…
High pressure luminescence studies have been made on several tris rare earth betadiketonates. From this information the pathway for intramolecular energy transfer between ligand and rare earth ion localized levels is clearly established. The emission from europium dibenzoylmethide (EuDBM) and europium thenoyl-triflnor…
A mutant of Saccharomyces cerevisiae that was selected for resistance to carbon catabolite repression also had reduced hexokinase activity. Hexokinase isoenzymes were purified from mutant and wild type cells. The specific glucokinase and hexokinase isozyme PI were present at normal levels in mutant and wild type, but…
The dielectric function e(q, ω) for liquid water is determined from an insulator model with parameters fixed by available optical data. Ionization of the oxygen K shell is described by generalized oscillator strengths. This model dielectric function is used to calculate the stopping power of liquid water for electrons…
The collagen arrangement of different cartilages of several mammals was studied by the Picrosirius-polarization method applied to tissue sections whose proteoglycans had been previously removed by enzymatic digestion. This procedure not only increases collagen birefringency but it also enhances the optimal resolution,…
Abstract The interaction of NO 2 with a Pt(111) surface was studied by molecular beam and thermal desorption techniques. At 300 K NO 2 adsorbs dissociatively into NO ad + O ad with an initial sticking coefficient s o = 0.97. s o decreases slightly with increasing surface temperature; the variation of the sticking coef…