Materials Literature
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The crystal structures of the high pressure Ga(II) and Ga(III) forms of gallium were studied by single-crystal x-ray diffraction using a diamond anvil device. Ga(II) has a body-centered-cubic structure with a=5.951±0.005 Å and 12 atoms in the centered cell; Ga(III) has a body-centered-tetragonal cell with a=2.813±0.00…
The localization and synthesis of alphafoetoprotein (AFP) during mouse embryogenesis were studied by immunoperoxidase and by immunoprecipitation after radioactive labelling, using an antiserum prepared against AFP. AFP is first detectable in embryos on the 7th day of gestation (7th day embryos). In 7th and 8th day emb…
Abstract Reinforcement mechanisms of fiber‐glass reinforced plastics (FRP) under wet conditions are reviewed with emphasis on molecular structures of glass/matrix interfaces. Included are studies on glass surface, the glass/coupling agent interface, silane coupling agents on glass surfaces as well as in solution, the…
Abstract TlGaSe 2 kristallisiert monoklin mit a = 10,772(3) Å; b = 10,771(5) Å; c = 15,636(8) Å; β = 100,6(3)°; Z = 16; Raumgruppe Cc. Nach der Verfeinerung mit 1366 unabhängigen Reflexen ergab sich ein R‐Wert von R = 0,082 (MoKα‐Strahlung). Die Verbindung bildet ein Schichtengitter mit zwei Anionenschichten parallel…
Using the R-line fluorescence of trace Cr3+ in sintered Al2O3 as an example, a method of analysis is outlined for determining the residual microstress and macrostress in a polycrystalline aggregate. It uses the shift and broadening, induced by residual stress, of a line due to a transition in an atomic system dissolve…
A chemical-bond approach reveals the possibility of several unusual bonding configurations that have relatively low energy in materials with lone-pair valence electrons. Valence-alternation pairs (V.A.P.) are the lowest energy charged defects. The interconversion between positive and negative centres is described in d…
Using muffin-tin orbitals and the atomic-sphere approximation, we have studied the band structures of Chevrel-phase molybdenum chalcogenides, ${M}_{m}{\mathrm{Mo}}_{6}{X}_{8\ensuremath{-}x}$. Generally, these compounds exist for a broad variety of elements, $M=\mathrm{Pb},\mathrm{Sn},\mathrm{Ag},\mathrm{Cu}$ and $X=\m…
The no-reflow phenomenon was studied following reconstitution of blood flow by microvascular anastomosis in an ischemic and denervated free epigastric flap in the rabbit. Microscopic, histological, angiographic, and hematological studies demonstrated the progressive nature of this obstruction to the peripheral blood f…
ABSTRACT The interference reflexion microscope may be used to examine the pattern of cell-substratum separation of cultured cells. Earlier studies on chick fibroblasts using this technique identified 3 types of separation: (1) focal contacts, representing approx. 10—14 nm separation and which are sites of cell-substra…
Abstract The equilibrium melting temperature, volume, and enthalpy and entropy changes on melting of poly(ethylene terephthalate) have been analyzed and heats of fusion have been newly measured with an automated scanning calorimeter to yield the following data: 553°K, 16.9 cm 3 /mole, 2.69 kJ/mole, and 48.6 J/deg/mole…
Abstract Besides mechanical blending and copolymerization there is a third possible way in which two polymers can be combined. Each polymer forms its own network, while both networks interpenetrate each other. There are no covalent bonds between the polymers. Such interpenetrating networks have been synthesized sequen…
The Voigt function provides a rapid and easily applied method for interpreting the breadths of diffraction profiles in terms of specimen defects and for studying absorption or emission spectra. In the past, approximate methods have usually involved the assumption that the constituent profiles are either Cauchy (Lorent…
Abstract Einkristalle der Titelverbindung mit x=14‐16 werden erhalten durch langsame Wasserdampfdiffusion in Lösungen von Fe3+ und Fe(CN)64‐ in konz. HCl.
Abstract The lamellar structure of certain polyethylene spherulites grown very slowly at low supercoolings (regime I crystallization) has been exposed by using new techniques. A highly regular texture is found whose main element is ridged sheets of alternating {201} facets, ca. 1 pm wide, growing outwards with b as sp…
Abstract Die während des thermischen Abbaus von PVC‐Pulver gebildeten Polyene reagieren leicht sochon bei etwa 100°C mit Sauerstoff. Die Anfangsgeschwindigkeit der Salzsäureabsplatung unter Sauerstoff ist bei den polyenhaltigen Proben wesentlich höher als beim ursprünglichen PVC. Die Geschwindigkeit der Salzsäureabspa…
The existence of a pressure-induced tricritical point in potassium dihydrogen phosphate was investigated by direct measurements of the spontaneous shear angle as a function of temperature using $\ensuremath{\gamma}$-ray diffractometry at pressures up to 2.15 kbar. High-resolution neutron diffractometry was applied to…
Measurements are reported on the AC and DC conductivity of evaporated films and single crystals of MoO 3 . In both cases a frequency-dependent conductivity is observed at low temperatures, and it is established that this is a true bulk property. A model is developed which shows that long-range potential wells surround…
The magnetic ordering of the anomalous antiferromagnet CeSb, which has a NaCl crystal structure, was determined in zero applied magnetic field by means of neutron diffraction investigations of single crystals and powder. Below the Neel temperature T N of (16.1+or-0.1)K, there exist six partially disordered magnetic ph…
Abstract The maximum of the d.c. conductivity of single crystals of the title compound ((TTT) 2 ‐I 3 ), grown by cosublimation, is shown to be at about 35K. The ratio of the b ‐axis (needle axis) conductivity at the temperature of its maximum (T m ≅ 35 K) and its value at T = 300 K (normalized conductivity σ (T m )/σ…
The deformation model considering a close interrelation and role of different processes has been proposed from systematic study of the superplastic flow in magnesium alloy. It is assumed that the superplastic flow of the alloy is caused by the cooperative operation of grain-boundary sliding (GBS) and some grain deform…