Materials Literature
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AlNとAl2O3の混合粉末をホットプレスして得た27R及び21 R-pseudo-polytype及びスピネル型のoxynitrideの熱伝導率を測定し, それぞれ0.015, 0.013, 0.026cal/cm・s・K (300K) であった.アルミナを各種温度で還元・窒化した酸素含有量の異なるAlN粉末を用い, 酸素含有量並びにホットプレス条件の熱伝導性に及ぼす効果について検討した. 熱伝導性は不純物酸素量の増加によって著しく劣化するとともに, 焼結温度によっても影響される. AlN微粉末の表面は一般に非晶質の酸化物で覆われているが, 1200℃以上で非晶質層からコランダムが析出する. コランダムは1650℃以上ではAlN…
A series of extracted fractions from sophora subprostrata was screened by determining anti-ulcer effects in pylorus ligated and stressed rats. Fr. [C-2] had the most potent anti-ulcer effects of all fractions extracted. Sophoradin and sophoranone which were isolated from Fr. [C-2] were also found to have inhibitory ef…
Abstract Although ring‐opening polymerization involving ionic intermediates and Ziegler catalysts are quite extensively used in polymer chemistry, free radical ring‐opening polymerization is extremely rare. We have been able to show that unsaturated spiro ortho carbonates will undergo double ring‐opening polymerizatio…
Abstract The influence of two nucleating agents on the crystallization parameters of 6‐Polyamide was investigated by differential scanning calorimetry and some substantial differences for the crystallization rate of the examined polymers were determined. The induction times t i , the semicrystallization times t 1/2 ,…
Precipitated Mg(OH) 2 particles 0.05 to 1 μm in diam. and of various shapes were calcined in air for 1/2 h at 704°, 816°, 954°, 1093°, or 1232°C. At 704°C, BET surface areas, initially 11 to 32 m 2 /g, increased 1.4‐ to 7.6‐fold, and TEM observations showed pseudomorphs. Depending on the parent crystal size and shape,…
High-resolution 125Te and 77Se Fourier transform n.m.r. spectroscopy has been used to characterize the previously known Te64+, Te42+, Se42+, and Te2Se42+ cations for the first time and several new mixed species in the +1/2 (Te3Se2+, cis- and trans-Te2Se22+, and TeSe32+) and +1/3 (Te3Se32+) oxidation states; the 125Te–…
The formation of surface radicals by adsorption of oxygen on CaO, MgO, γ-Al2O3 and ZnO has been studied by e.s.r. spectroscopy.The oxides, after activation by heating under vacuum, were exposed to oxygen at 298 K. In these conditions (O–2)s and (O–3)s radicals, at concentrations of about 5.5 × 1015 and 1.5 × 1015 spin…
Subsolidus phase relations in the system Na 2 O‐Bi 2 O 3 ‐TiO 2 at 1000°C were investigated by solid‐state reaction techniques and X‐ray diffraction methods. Five ternary compounds were observed in the system: Na 0.5 Bi 4.5 Ti 4 O 15 ; Na 0.5 Bi 0.5 TiO 3 ; a cubic pyrochlore solid solution composed of xNa 2 O.25Bi 2…
During localized (crevice and pitting) corrosion, a local cell is established between an anode within a crevice or pit and a cathode on the surrounding passive surface. Data are presented to show that concentrated acidic chloride solutions, simulating corrosion product hydrolysis within a crevice or pit, produce poten…
Three series of non-polar acrylic copolymers based on 2-ethyl hexyl acrylate and four series of polar copolymers based on ethyl acrylate were synthesised. Their adhesion performance was assessed by measurement of the force required to detach a probe (tack strength), that required to peel a strip (peel strength) and th…
The title compounds have been prepared and characterised by chemical analysis and X-ray diffraction. By magmetic-susceptibility and magnetisation measurements they are shown to order ferromagnetically at Tc= 58 ± 2 and 55 ± 2 K respectively. Up to ca. 0.7 Tc the magnetisation M(T) obeys the equation 1 –[M(T)/M(0)]=CTγ…
Abstract Es wird gezeigt, daß die mechanische Beanspruchung der Stärke in Form einer plastischen Stärkekornverformung in optimaler Weise deren physikalische und chemische Eigenschaften verändert. Die zur Verformung notwendigen Energiebeträge sind zwar klein, können aber mit den z. Z. bekannten Werkzeugen nicht gezielt…
Polymer coatings were produced on graphite fiber electrodes by electroinitiated polymerization in an electrolytic cell containing monomer. The adhesion of the coated graphite fibers to an epoxy matrix has been measured by single fiber pull-out tests. The measured values of the pull-out force, and scanning electron mic…
The powder mixtures in the AlN-Al2O3 system were hot-pressed under 200kg/cm2 at 1600-2100°C for one hour. The effect of Al2O3 addition on the densification rate was remarkable especially in the AlN rich composition range. Several crystalline phases were observed in the hot-pressed specimens. Oxynitride of spinel type…
Mineralogical properties of two dioctahedral mica minerals with ammonium ions, collected from Ohgidani pottery stone deposit, Ehime Prefecture, are presented in comparison with those of a dioctahedral potassium mica mineral.The two minerals with ammonium are characterized chemically by containing about 2 weight per ce…
The effect of bumetanide upon the endocochlear potential (EP) was examined in 46 guinea pigs. The EP was reduced with dosages of 5 mg/kg or more. The maximum depression of the EP (reduction to -30 to -40 mV) was obtained at a dosage of 30 mg/kg. The recovery of the potential was incomplete at any dosage within three h…
A green species has been generated both by oxidation of gaseous xenon with a dioxygenyl salt and by reduction in antimony pentafluoride solution of the XeF+ cation, e.g. with water or a suitable metal; the Raman, u.v.-visible and e.s.r. spectra of the product are all consistent with the identity Xe2+, representing the…
The stress-induced products formed by cold-rolling in Ti-11∼20%Mo and Ti-16%V binary alloys have been examined by means of optical microscopy, X-ray diffraction and transmission electron microscopy.Plate-like products in a Ti-11%Mo alloy with a meta-stable β phase were {332} twins and a small amount of orthorhombic ma…
From u.v. absorption and fluorescence measurements it is suggested that N-(dialkylaminomethyl)phthalimides fluoresce(weakly) from the second excited singlet state (π,π*), and that the lowest energy singlet state (n, π*) is non-fluorescent. Phosphorescence occurs from the lowest triplet state at 77 K, and in ethanol so…
A new method for analyzing $\ensuremath{\alpha}$-nucleus optical potentials is presented. It consists of adding to the conventional Woods-Saxon real potential an extra potential given by a Fourier-Bessel series. The coefficients of the series are determined by least-squares fit to experimental cross sections for elast…