Materials Literature
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A high-voltage electron microscope has been used to study displacement damage at 600°C in graphite. Small defect clusters were observed for incident electron energies above 150 keV, indicating a threshold energy of 34 ± 2eV for atomic displacement along the c-axis.
This paper reports measurements of the magnetostriction in both single-crystal SmCo5 and in the liquid-phase sintered (LPS) SmCo5 permanent magnet material at fields up to μoH=21 T. By using a strain-gauge technique the changes in length in different crystallographic directions were measured as a function of the field…
Abstract Regular copolyoxamides were prepared from diamine‐oxamides and aliphatic diacid chlorides by interfacial and solution polymerization. Interfacial polymerization is preferred with diamineoxamides where the diamine portion has two to six methylene groups and the diamine‐oxamides are readily soluble in water. Re…
Abstract Antiplasticization, defined as an increase in glassy modulus of polymers upon dilution with low molecular weight compounds, was studied for highly crosslinked epoxy resins. A series of oligomers with average molecular weight 500–4000 was incorporated with epoxy resins for elucidating the effect of their molec…
The first single crystals of As 2 O 5 have now been obtained by annealing amorphous As 2 O 5 under oxygen excess pressure and with careful exclusion of moisture. They were suitable for X‐ray structure analysis.
The optical spectra of (NEt/sub 4/)/sub 2/UI/sub 6/ and (NEt/sub 4/)/sub 2/UF/sub 6/ are presented and analyzed. With these data the electrostatic, spin-orbit, and crystalline field parameters have been obtained for the series of octahedral compounds UX/sub 6//sup 2 -/ (X = F, Cl, Br, I). The Slater parameter F/sup 2/…
Design details and measured performance are presented for a laboratory gas gun with a novel rectangular bore. Projectiles weighing 0.5 g have been accelerated to 300 m s -1 . This design eliminates axial rotation of the projectile which is possible in a cylindrical-bore gun, and provides important advantages in some i…
Abstract Verzug umfaßt Maß‐ und Formänderungen. Maßänderungen entstehen durch Wärmespannungen und Gefügeumwandlungen, insbesondere beim Härten und Anlassen. Wärmespannungen bewirken abmessungsabhängige, Gefügeumwandlungen abmessungsunabhängige Maßänderungen. Das Maßänderungsverhalten ist eine Systemeigenschaft. Anlaßv…
Abstract Normal incidence reflectance measurements with E ∥ c polarization are performed on polished surfaces of pyrolytic graphite for 15 meV < ħω < 500 meV and the dielectric function ϵ ∥ (ω) is derived from the data by Kramers‐Kronig analysis. The function ϵ ∥ (ω) is characterized by a background dielectric c…
Abstract The structure of isotactic poly(2‐vinylpyridine) has been determined from x‐ray fiber data utilizing rigid‐body least‐squares refinement techniques. The polymer exists as a threefold helix with three chains passing through a hexagonal unit cell having the dimensions a = b = 15.49 Å and c = 6.56 Å (fiber axis)…
Molybdenum Kα X-radiation, monochromated by an NaCl single crystal, was scattered in 1-propanol at -25°C. The angular distribution of the scattered X-ray intensity was determined and used for the calculation of the experimental pair function. On the basis of some models of the structure of liquid 1-propanol, the theor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe carbonyl scrambling processes in the isomeric pentacarbonylguaiazulenediiron and homologous ruthenium molecules; a novel mechanism for the internuclear processesF. Albert Cotton, Brian E. Hanson, John R. Kolb, Pascual Lahuerta, George G. Stanley, B. Ray Stults, and Alan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 Spin Relaxation Parameters of Semicrystalline Polymers. Linear PolyethyleneR. A. Komoroski, J. Maxfield, F. Sakaguchi, and L. MandelkernCite this: Macromolecules 1977, 10, 3, 550–556Publication Date (Print):May 1, 1977Publication History Published online1 May 2002P…
Abstract The thermal decomposition of poly(butene‐1 sulfone), poly(pentene‐1 sulfone), poly(hexene‐1 sulfone), poly(styrene sulfone), and polystyrene was investigated in helium at a heating rate of 20°C/min using an experimental system which consists of a programmable pyrolyzer, a thermal conductivity detector, a mass…
Reduction of tissues with sodium cyanoborohydride at pH7.4 gave results identical with those obtained by KBH4 treatment. On reduction with sodium cyanoborohydride at pH 4.4, however, a previously undetected basic compound was formed and was identified by mass spectrometry and chemical degradation techniques as dihydro…
The effects of dispersion and sieving on the determination of fiber content was studied using four peat materials selected for their range of properties. In addition, a method of particle-size analysis of peat materials and chemical characterization data of the particular-size fraction are presented. Controlling the s…
The synchrotron X-ray beam produced by the SPEAR storage ring at the Stanford Linear Accelerator Center has been used as a tuneable and intense source for single-crystal-protein diffraction experiments. A measurement of the absolute intensity of a focused, monochromatized X-ray beam gave a value of 3 × 109 photons s-1…
An outline is given of some of the steps which in the last ten years have led to an understanding of many of the properties of conduction and valence bands in non-crystalline materials. The concept of a mobility edge is described and some of the experimental evidence for its existence is presented. A discussion is giv…
Die Röntgen‐Strukturanalyse von B 2 S 3 scheiterte bisher an der schlechten Qualität des Kristallmaterials. Jetzt konnten Einkristalle erhalten werden, an denen sich die Struktur aufklären ließ. magnified image
Abstract A series of starch graft copolymers and one cellulose graft copolymer were prepared containing 40‐50 percent synthetic polymer. The monomers used (styrene, methyl methacrylate, methyl acrylate, and butyl acrylate) were chosen to give grafted synthetic polymers with varying glass transition temperatures (T g )…