Materials Literature
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The near-band-edge optical properties of a series of 15 crystals including the two binary compounds GaSe and GaTe have been investigated in great detail at 300, 77, and 1.6\ifmmode^\circ\else\textdegree\fi{}K. The absorption spectra at 77 and 1.6\ifmmode^\circ\else\textdegree\fi{} K show well-resolved excitonic struct…
Abstract The influence of shearing history on the viscoelastic properties of low‐density polyethylene (LDPE) is investigated. Swelling of extrudates from a melt indexer is measured for monitoring the variation in viscoelasticity. Continuous shearing of molten LDPE reduces the swelling ratio. The reduction is not due t…
Abstract A low molecular weight poly(ester urea), poly(L‐phenylalanine/ethylene glycol/1,6‐diisocyanatohexane), and a model diester diurea, dimethyldiphenylalaninehexamethylenediruea, were synthesized and found to be hydrolyzed by α‐chymotrypsin solutions at pH 7.8. After ten‐day exposure to 0.1 mg/ml enzyme solution…
Spectral, kinetic, and relative quantum intensity measurements are reported for a series of ${\mathrm{Y}}_{3}$${\mathrm{Al}}_{5}$${\mathrm{O}}_{12}$ (YAlG) crystals, both nominally undoped and activated by ${\mathrm{Ce}}^{3+}$ and ${\mathrm{Tb}}^{3+}$. The undoped crystal shows a complex emission band in the near uv w…
A new electromagnetic transducer configuration is described for generating horizontally polarized shear (SH) waves in ferromagnetic materials. The transducer consists of a meander coil and static bias magnetic field parallel to the coil elements. This configuration generates no ultrasonic waves in a nonmagnetic metal…
Single-crystal samples of $\ensuremath{\alpha}$-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ have been studied that were colored during growth. The samples initially contained a single absorption band at 6.1 eV with a half-width of 0.68 eV. The sample had to be heated to a over 1400\ifmmode^\circ\else\textdegree\fi{}C to rem…
Abstract The adsorption abilities of chitin and its congeners with two series of degrees of deacetylation prepared by two different deacetylation procedures were compared. Among the polysaccharides obtained by the heterogeneous method, those with higher amino group content had higher adsorption ability. Plots of colle…
Measurements are presented of the optical properties of the radical cation TT${\mathrm{F}}^{+}$ (tetrathiafulvalenium) in a variety of different conditions: as TT${\mathrm{F}}^{+}$ monomers in solution, as ${(\mathrm{T}\mathrm{T}{\mathrm{F}}^{+})}_{2}$ dimers in solution, in the monovalence (TTF)${\mathrm{Br}}_{1.0}$…
The fine structure in the angle-resolved secondary electron emission (SEE) spectra can be interpreted fully in terms of the electronic structure of the semi-infinite crystal. A large number of elements of structure can be related to the bulk band structure. In addition, extra features are unambiguously interpreted in…
Abstract The polymerization of 1‐vinylindole ( 1a ) induced by free radical and cationic initiators is studied and the structure of the resulting polymers is elucidated by 13 C NMR spectroscopy. Also 2‐methyl‐1‐vinylindole ( 1b ), 3‐methyl‐1‐vinylindole ( 1c ), and 2,3‐dimethyl‐1‐vinylindole ( 1d ) are polymerized in…
Abstract A method is presented for inverting the Fredholm integral equations of the first kind that arise in many experimental determinations of molecular weight distributions of high polymers. The well known problems of instability and nonuniqueness are minimized by constraining the distribution to be the smoothest n…
Ordered phases in Pd‐rich Pd‐Mn system were investigated by means of selected area electron diffraction and X‐ray powder diffraction methods. The stability range of the periodic one‐dimensional antiphase structure Pd3Mn on the equilibrium phase diagram and the composition and temperature dependence of antiphase domain…
FCC結晶粒よりなる多結晶板モデルを用いて,増分的結晶弾塑性有限要素法により,各種比例負荷下の応力-ひずみ曲線,等ひずみ曲線,後続降伏曲線,繰り返し負荷下のヒステリシスループの形成,идьюшннの遅れ現象,ひずみ経路急変直後の応力-ひずみ曲線の異常挙動(一時低下),およびメカニカルラチェット現象といった複雑多様な(巨視)塑性挙動をシミュレートし,本モデルの実際的意義を確認した.
石英ガラス, 5Na2O・95GeO2ガラス, Ca(PO3)2ガラス, ソーダ石灰ガラス及びパイレックスガラスの光弾性定数 (以下Bと略す) を測定した. 石英ガラスのBがソーダ石灰ガラスのBの1.33倍であることはWeyl説では説明できない. 石英ガラスでは主としてSiO44面体の6員環からなり, 環内には透き間がある. この構造への, 圧縮において共有する角頂の結合角が変化する変形によって透き間を埋める変形が起こり, これが8を正で大きくしているとして, Bへの寄与に対する新しい機構を提案した. GeO2, 5Na2O・95GeO2ガラスも同様である. ホウ酸塩ガラス, ホウケイ酸ガラスではtetraborate群及びdib…
The impulsive pressure pulses arising from copper wire explosions are measured using Hopkinson pressure bar technique under various charging voltages up to 63 kV, charging energies up to 2.6 kJ, natural frequencies of the discharge circuit from 10 kHz to 50 kHz and various wire dimensions, and impulses which are defin…
The influence of temperature and chloride content on the behavior of localized corrosion such as crevice corrosion and on the occurrence of stress corrosion cracking have been investigated by long term immersion of the spot-welded specimens of ferritic and austenitic stainless steels in 100-21, 000ppm Cl- solutions at…
Adsorption behaviors of Ni (II), CO (II) and Mn (II) on silk fibroin fiber and also on the same fibers but chemically modified with acetic anhydride-pyfidine mixture or dehydrated methanol were investigated, and the results were compared. The following findings are reported: (i) No adsorption of Ni (II), Co (II) and M…
Thin films of ZnS prepared by coevaporation of ZnS and MnF 2 have been studied by XPS. It is found that the binding energies of Mn 3p and F 1s electrons, as well as the intensity ratio of the Mn 3p peak to the F 1s peak, depend on the concentration of Mn, and can be divided into three groups. A tentative model that pe…
The kinetics of aqueous polymerization of acrylamide with the Cu2+/metabisulfite redox system has been studied in an atmosphere of nitrogen at 35 ± 0.2°C. The rate of polymerization has been found to be second power on monomer concentration, zero and 0.5 power with respect to catalyst, and 0.5 power with respect to ac…
The kinetics of anodic iron dissolution in deaerated and oxygenated distilled water has been studied using a galvanostatic method. In oxygenated water an indirect method was also used. This indirect method is based on determination of the anodic partial potential-current curve from the dependence of the open circuit p…