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The fracture strength of two kinds of UO2 specimens possessing pores of different maximum sizes (60 and 140 μm) was measured in the range of room temperature − 1,300°C by means of diametral compression testing. The fracture strength thus obtained proved to be smaller than any of the values reported by previous authors…
Recent measurements of nematic-smectic A pressure-temperature phase boundaries obtained in bilayer forming smectic A liquid crystals are analyzed. A thermodynamic model which accounts for the elliptical shape of the phase boundaries and which facilitates determination of the various parameters determining the phase bo…
Liquid metal in a closed container made of dissimilar metal under a magnetic field is, in general, set into motion by thermoelectric effects if the interfacial temperature is nonuniform, a situation likely to occur in fusion reactor blankets owing to the high thermoelectric power of lithium. The paper sets out the gen…
Expressions are derived for the discharge inception voltage (Vi), at which discharges occur in entrained voids within the insulation of single-core cables. The influence of Vi on the shape, and location of a void has been determined for different air pressures inside the void.
The various aspects of the use of boron products in cellulose insulation are discussed.
Phosphate deposits of igneous origin contributed some 19 million metric tons to the total world marketable output of phosphate rock of nearly 116 million metric tons in 1977. Most of this was produced in the USSR from the Khibiny Complex, Kola Peninsula. There was production at the neighboring Kovdor Complex and, in n…
A series of experiments was done to determine how contamination flashover occurs under dc conditions. It was found that polarity influenced the flashover voltage, with flashover occurring more readily for negative polarity. Several reasons are advanced to explain this, including cathode spot phenomena, and electrochem…
Abstract Polarized Raman spectra of single crystals of NaH 2 PO 4 ·2H 2 O and NaD 2 PO 4 ·2D 2 O have been measured as a function of temperature in the wavenumber shift range 10–3600 cm −1 . Changes of phonon frequencies due to directional dispersion are found. All the observed bands have been assigned using group the…
Al-coated glasses of molar composition 20Na2O-10CaO-70SiO2 have been bombarded with a rastered beam of either 7- or 10-keV electrons. SIMS analysis of these glasses indicates a near-surface layer deficient in Na, bounded by a steep rise of the Na signal. The thickness of this layer increases with electron-bombardment…
Abstract Ag 2 BaGeS 4 was prepared for the first time and the crystal structure determined using X-ray methods, a - b = 682,g; c = 801, 7 pm, Space group I4̅2 m (No. 121) tetragonal. The atomic parameters and interatomic distances are reported and the structure is discussed.
The doping method in quantitative X-ray diffraction phase analysis is described. The method involves the addition to the investigated system of known amounts of the components, the weight fractions of which are to be simultaneously determined. The weight fraction of a component is related to the intensities diffracted…
The application of optical second harmonic generation (SHG) to the study of non-centro-symmetry in 71 α-amino acids, 22 dipeptides. 6 tripeptides. 16 proteins, and 5 viruses is reported. All α-amino acids except α-glycine, all peptidcs containing at least one enantiomeric α-amino acid residue, and all proteins and vir…
With a partial-wave interpolation method we calculate the electron bremsstrahlung energy spectra from neutral atoms with atomic number $Z=13 \mathrm{and} 92$ for incident electrons of kinetic energy ${T}_{1}=5 \mathrm{and} 10$ MeV. This is an attempt to bridge the gap between the results we have previously obtained fo…
Electrical conductivity of the sintered Nb 2 O 5 ‐ doped CeO 2 specimens was measured between 800° and 1329°C in the p O 2 range 10 −19 –1 atm. A polarization technique was used to determine the predominant electrical conduction mode in these specimens. Thermogravimetric analysis was done to measure the weight loss in…
Abstract Polymeric materials with novel properties for new technological applications are increasingly obtained by combining existing polymers, while the synthesis of new monomers has receded into the background. These polymer combinations or “alloys” (polyblends) are characterized by their chemical composition, the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelation between structure and magnetic exchange interactions in bis(hexafluoroacetylacetonato){N,N'-ethylenebis[2-hydroxypropiophenone iminato-N,O(2-)]copper(II)}M'(II), Cu((prp)2en)M'(hfa)2, where M' = Cu, Ni, and Mn. Crystal structures of the complexes(M((prp)2en)M'(hfa)2…
A semi-empirical model is developed to describe the structure of porous coal char. The pores are assumed to be cylindrical tubes of length lp and radius rp . The number of pores whose radius is between rp and rp + drp is denoted by a pore distribution function. A statistical theory and the available data suggest a rp…
The myofibroblast population was studied by electron microscopy in rat wounds healing by (1) contraction of granulation tissue, (2) by coverage with split-skin grafts, and (3) by coverage with full-thickness skin grafts. In all 3 types of wounds, myofibroblasts appeared early and reached a peak number at two weeks aft…
A mechanism of irradiation creep arising from the climb-enabled glide of dislocations due to stress-induced preferred absorption of radiation-produced point defects is proposed. This creep component is here termed preferred absorption glide, PAG. PAG-creep operates in addition to the previously studied components of c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral method for the preparation of substituted tetrathiafulvalenes and directing effects of substituentsDennis C. GreenCite this: J. Org. Chem. 1979, 44, 9, 1476–1479Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue 1 Ap…