Development of electroadhesive devices for zero-g intra/extravehicular activities
Chemically activated electroadhesive pads on spacecraft surface, allowing astronauts to maneuver or work in zero gravity environments
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The crystallography of calf rennin (chymosin)
Abstract The growth of crystals of calf rennin (chymosin, † EC 3.4.4.3) and the control of nucleation to produce crystals of desired size, are described. Only one stable species, orthorhombic rennin I, has been found, but a metastable monoclinic species, rennin II, appeared on one occasion in a solution nearly saturat…
Deep Inelastic Scattering of Electrons on a Photon Target
One of the precesses which may be observed in ${e}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{-}}$ colliding-beam experiments is the deep inelastic electron-photon scattering. We examine the feasibility of such an experiment assuming an appropriate scaling limit.
Surface Vibrations of Silicon Detected by Low-Energy Electron Spectroscopy
The energy loss of 5-eV electrons reflected from clean and from oxidized (111) silicon surfaces has been investigated. A surface phonon with $\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{\approx}55$ meV, $k\ensuremath{\approx}0$ is found at the clean surface. After exposure to \ensuremath{\cong}${10}^{\ensuremath{…
Electrochemical preparation of polymers with multinodal molecular weight distributions
Abstract A direct electrochemical preparation of polybutadiene to a predetermined molecular weight distribution has been achieved. Butadiene is a good model compound, inasmuch as the rate of electrochemical initiation is high relative to the rate of propagation. Rate constants for the temperature interval of interest…
Method for Processing of Periodic Images at Reduced Levels of Electron Irradiation
Meaningful high resolution microscope of specimens that are sensitive to radiation damage is limited in resolution by considerations of statistics and contrast in the image. The product of contrast, C, and resolution, d, must satisfy the inequality where S/n is the minimum acceptable ratio of real contrast to statisti…
Mikroskopische Prüfung von Edelstählen auf nichtmetallische Einschlüsse mit Bild reihen
Kritische Betrachtung der verschiedenen in Anwendung stehenden Bildreihen zur Ermittlung des Gehaltes an mikroskopischen nichtmetallischen Einschlüssen in Stahl. Forderungen an eine allgemein anwendbare Bildreihentafel. Darstellung einer neuen Bildreihentafel und Beschreibung ihres systematischen Aufbaues nach Art, Fo…
Asymmetric oxidation of poly(vinyl sulfides) with percamphoric acid, aspergillus niger, and penicillium notatum
Abstract The asymmetric oxidation of poly(phenylvinyl sulfide) (poly‐Ph VS) and poly( t ‐butylvinyl sulfide) (poly‐ t ‐BuVS) was carried out with optically active percamphoric acid, and the optically active polysulfoxides were obtained. The values of the specific rotation for the oxidation products of poly‐PhVS and po…
Thermal analysis of polymers. VIII. Dilatometric and thermal optical behavior of sulfur
Abstract The use of combined modes of thermal analysis by differential thermal analysis (DTA), thermomechanical analysis, and thermal depolarization analysis (TDA) presents a more illustrative picture of the phase transitions and behavior of the allotropes of sulfur. Volumetric changes suggest the T g of polymeric sul…
Diamagnetic Anisotropies of Metal-Free, Nickel(II), and Zinc(II) Phthalocyanines
Diamagnetic susceptibilities and anisotropies of metal-free, nickel(II), and zinc(II) phthalocyanines are reported. Calculations based on Pauling's semiclassical model give very poor agreement with the experimental results. The results are interpreted following the procedure of Amos and Roberts from which it emerges t…
Raman spectral study of bisulfate-sulfate systems. III. Salt effects
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectral study of bisulfate-sulfate systems. III. Salt effectsD. E. Irish and H. ChenCite this: J. Phys. Chem. 1971, 75, 17, 2681–2684Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://pubs.acs.or…
Synthesis and thermal degradation of some ferrocene‐containing polyazines and poly‐schiff bases
Abstract A series of ferrocene‐containing polymeric azines and polymeric Schiff bases have been synthesized by means of acid‐catalyzed solution polycondensations. The molecular structures of the polymers synthesized have been determined, and information concerning their thermal behavior has been obtained. Comparative…
Orthophosphates. XIII. Thermal decomposition of secondary calcium orthophosphate (CaHPO4) and secondary calcium orthophosphate dihydrate (CaHPO4.2H2O)
Abstract The thermal decomposition of CaHPO 4 and CaHPO 4 .2H 2 O was studied by thermogravimetric analysis, X‐ray powder diffraction, and infra‐red spectroscopy. At 105°c, two moles of CaHPO 4 .2H 2 O combine and eliminate 1 mole of H 2 O. The remaining three moles of hydration water are eliminated at 165°c. Decompos…
Thermodynamische Untersuchung flüssiger Nickel-Kupfer-Legierungen
Measurement of the molar enthalpies of mixing of molten nickel-copper alloys by means of a high-temperature calorimeter at 1480 °C immediately during the mixing of the two liquid components. Check of the fusion equilibria of the system nickel-copper and indication of new values for the solidus line. Determination of t…
Influence of temperature on microstructure of anionic‐initiated polybutadiene
Abstract Application of the Arrhenius relationship for temperature and ratio of isomeric units in polybutadiene made in the presence of butyllithium initiator is consistent with the existence of three simultaneous competing reactions. Evidence in the literature is cited to support the possibility that the growing chai…
Linear Electrooptic Properties of ZnTe at 10.6 Microns
The low-frequency linear electrooptic coefficient r 41 T in semi-insulating ZnTe is measured at 10.6 µm at room temperature. The measured value is (3.9±0.2)×10 -12 m/V, which is only slightly smaller than that in the visible region. This result seems consistent with a lattice theory on the dispersion of r 41 T in crys…
Multilayer Textile Structures: Relationship Between the Properties of a Textile Composite and its Components
The relationship between the mechanical properties of textile composite structures and those of the constituting face and liner fabrics have been studied experimentally and theoretically. Three different face fabrics have been fused together with a number of fusible interlinings of different base cloth, adhesive type,…
NMR observations of drawn polymers. VII. Nylon 66 fibers
Abstract Wide‐line NMR spectra have been obtained on an oriented sample of drawn nylon 66 fibers at temperatures between −196°C and 200°C and at alignment angles between the fiber axis and the magnetic field of 0°, 45°, and 90°. At −196°C, 20°C, and 180°C, the complete angle dependence of the NMR spectrum has been mea…
Calculation of the Zero Wave Vector Lattice Frequencies of Alpha- and Beta-Oxygen
The optically active lattice frequencies of α- and β-O2 have been calculated in the rigid-molecule approximation using an atom–atom Lennard-Jones [6–12] potential, with and without the addition of an intermolecular quadrupole–quadrupole interaction. Both models predict frequencies reasonably close to those observed ex…
GeCd4S6, a new defect tetrahedral structure type
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeCd4S6, a new defect tetrahedral structure typeH. Steinfink and K. SusaCite this: Inorg. Chem. 1971, 10, 8, 1754–1756Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://pubs.acs.org/doi/10.1021/ic50102a…