Materials Literature
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A series of cell calculations for the Chernobyl reactor was performed using the SRAC code system to provide its fundamental neutronic characteristics for the accident analysis at JAERI. The calculations are based on a two-step cell modelling. The primary cell is supposed on a unit square graphite block of 25cm × 25cm…
Abstract A new method for preparing block copolyarylates via two‐step interfacial polycondensation is proposed. First, oligomers with acid chloride end groups were obtained from interfacial polycondensation with a mole ratio of bisphenol A to diacid chloride(s) less than I. In the second step, two reaction systems con…
Complexes of the type type ML2.2H2O of Co(II), Ni(II) and Cu(II) with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (LH) have been prepared and characterized on the basis of elemental analyses, magnetic susceptibility measurements, infrared and electronic spectral data. All the complexes are high-spin six-coordinated…
The resistivity of gold films with thicknesses between 18 and 52 nm is measured from 4.2 to 310 K. The effect of the deposition of thin (1.5 mm) gold layers on top of these films will be discussed. During the deposition and the subsequent resistivity measurements the samples are kept under high vacuum conditions insid…
Abstract According to field studies of the Pugu Hill kaolin deposit and mineralogical investigations (X-ray, SEM), two main types of Miocene sandstones are distinguished: (i) clayey-silty kaolinitic sandstones with stacks of idiomorphic pseudohexagonal kaolinite crystals; (ii) massive clayey-silty kaolinitic sandstone…
A similarity solution of the Leslie-Ericksen equations for nematic liquid crystals is obtained for converging and diverging flow. The director distribution for parameters characteristic of lyotropic liquid crystal polymer solutions shows a boundary layer resulting from interactions between wall- and flow-induced orien…
The variation in electrical properties and morphology of biaxially-oriented polypropylene (BO-PP) films with thermal aging is discussed, using two kinds of BO-PP films. It was found that the thermal aging behavior of those two types of films depends on their initial morphology. The thermal aging gives rise to an incre…
A transmission line equivalent circuit model for strip gratings is used to determine the performance of both conducting and resistive gratings. A polarization sensitive Salisbury screen is designed in which the space cloth is replaced by a resistive grating and the ground plane is replaced by a parallel conducting gra…
Spin reorientation Γ 4 ( F z , G x ) → Γ 2 ( F x , G z ) induced by a magnetic field parallel to the α-axis has been studied in disprosium orthoferrite at temperatures above the Morin point. A new first-order phase transition from the Γ 24 ( F x , F z , G x , G z ) state to the Γ 12 ( F x , G y , G z ) one has been fo…
Abstract The polymerization of propylene oxide (PO) was studied with an initiator prepared by the reaction of ( R )‐(−)‐3,3‐dimethyl‐1,2‐butanediol ( 1 ) with aluminium hydride. When mixed with zinc chloride in a 1:1 mole ratio, the initiator was found to be highly reactive and also stereoelective in the polymerizatio…
Effect of uniformity on the resistivity was investigated for SiC‐ZrB 2 ceramic composites. Dispersion of ZrB 2 particles was numerically characterized by image analysis. Spatial fluctuation of composition greatly affected the resistivity of composites. The effective medium theory was extended to treat composites with…
Light and electron microscope observations have been made of Opephora olsenii collected from brackish water sites mainly on the Swedish west coast, where it is one of the dominant species in the epipsammic microflora. O.olsenii differs from other taxa allocated to Opephora in having interlocking spines originating fro…
Abstract Aiming to prove that commercial, 50°CPVC consists of a dual population of chains, has led us to the investigation of the thermal stability of low conversion (0,1–2%) PVC. Bulk polymers prepared at very low conversion levels were shown to be different to high conversion material. The former are more syndiotact…
Galvanized substrate morphology, oxide layer chemistry, bond failure modes, failure loci, and bondline corrosion have been investigated for adhesive bonds to galvanized steel. Significant differences in surface morphology were observed between the relatively smooth surfaces of “hot-dipped” substrates and the considera…
The inception voltage Vi for 1 pC partial discharges has been measured for vacuum molded needle-plane samples of low density polyethylene. The principal parameters studied are needle radius R (3≦R≦100 μm), ambient gas (air, N2, Ar, SF6), and frequency of the applied ac Voltage (60 Hz, 1 kHz). Experimental results duri…
Photosensitive polyimides have been investigated as substitutes for a standard aqueous base-etchable polyimide. The application uses a ceramic base module on which two layers of metal circuits are separated by a polyimide dielectric. Using a photosensitive polyimide reduces the number of steps and shortens the process…
Abstract The temperature dependence of 35 Cl NQR frequencies of [(CH 3 ) 2 NH 2 ] 2 SnCl 6 was precisely determined between 78 and ca. 250 K. by means of an FT NQR spectrometer. The high‐frequency line of the two 35 Cl NQR signals having the intensity ratio of 2:1 already reported was observed to be split below 102 K.…
Several 13.2 kV, 21,000 HP synchronous motors failed as a result of interturn insulation breakdown. Investigation of motor failures indicated that the cause was related to high magnitude, steep fronted surge waves (References 1 and 2). Partial discharge (corona) related failures were discounted without any actual meas…
The pressure dependence of the Raman-active vibrational modes in ${\mathrm{TlReO}}_{4}$ has been investigated up to 16 GPa, using the diamond-anvil cell. The abrupt changes in the Raman spectra indicate that three pressure-induced phase transitions occur at 0.5, 1.9, and 9.7 GPa. The first two transitions are not acco…
Abstract An experimental study of agglomeration tendency and the compounding of calcium carbonates of varying particle size into polypropylene and polystyrene melts in an internal mixer and in a two roll mill is described. The tendency of particles to agglomerate was studied using the sedimentation volume method. Aggl…