Materials Literature
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Abstract The uptake of water by nylon 6,6 [42DB Adipure (trade name of Dupont Canada Inc.)] at 100°C has been monitored by a combination of one‐dimensional proton NMR spectroscopy, relaxation time ( T 1 and T 2 ) measurements and proton microscopic NMR imaging techniques. The relaxation times of the water absorbed int…
The microstructure of the shells of scallops Patinopecten yessoensis and oysters Crassostrea gigas that were infested with four species of boring polychaetes, namely Polydora variegate, P. websteri, P. convexa, and P. concharum, was studied. Scanning electron microscopy revealed many characteristic concentric-like hol…
Effective insulation of the electrically conducting channel walls leads to a tolerable magnetohydrodynamic (MHD) pressure drop of liquid metal flows in self-cooled fusion reactor blankets. Such insulation prevents closed current circuits over conducting walls and reduces the total current, which determines the pressur…
細孔径を均一に制御した多孔質ガラス膜を用いる膜乳化法において, 単分散O/Wエマルションの生成に及ぼす界面活性剤の影響を検討し, 得られた結果はつぎの通りである.連続水相に適当量の活性剤が欠かせないが, 従来の方法で用いられるよりも遥かに少ない活性剤で単分散乳化が行えた.添加する活性剤は臨界透過圧力を減少させ, 単分散エマルションが安定して得られる圧力域を広げる効果を有する.しかしながら, 界面活性剤分子の極性基が多孔質ガラス膜の表面の電荷と異なる符号の電荷を有するときは, 活性剤の膜への吸着が起こり, 膜が見掛け上, 疎水化した.このため, 得られるエマルションは著しく多分散化した.
The main results obtained from studying recovery of irradiation embrittlement of reactor vessel steels are presented. Investigations were carried out using WWER-440 vessel materials (base metal, weld metal). The irradiation temperature was 270°C, which corresponded to the operation temperature of the vessel wall. The…
The reaction of the 1,1-diisityl-3,3,3-triisopropyldisilaphosphene 1(isityl = 2,4,6-triisopropylphenyl) and the analogous disilaarsene 2 with 1,6-diisocyanohexane results in the formation of the unusual tricyclic macroheterocycles 5 and 6; the molecular structures of 5 and 6 have been established by X-ray crystallogra…
The structure elucidation of three related pregnane glycosides, sarcovimiside A, B, and C from Sarcostemma viminale, is based on a detailed study of their highfield 1H and 13C NMR spectra. The results show that all the sugars are (1 → 4)-linked and both (β-D- and α-L-cymarose residues are present in each glycoside cha…
A non-mesogen, consisting of two stilbazole moieties as proton accepting end groups linked by a triethylene glycol unit, was synthesized. Monotropic smectic B phases were observed for mixtures with nonanoic acid up to tetradecanoic acid as proton donors. Enantiotropic nematic and, in some cases, monotropic smectic A p…
Three strategies for incorporation of [Fe(CN)6]3–/4– into polyaniline (PANI)-coated electrodes have been investigated: A, ion-exchange of [Fe(CN)6]3–/4– into pre-formed PANI-Cl- or PANI-SO4-coated electrodes; B, electropolymerisation of aniline from acidified K4[Fe(CN)6] or K3[Fe(CN)6]; and C, electropolymerisation of…
Synopsis The steady states of the Cahn–Hilliard equation are studied as a function of interval length, L , and average mass, m . We count the number of nontrivial monotone increasing steady state solutions and demonstrate that if m lies within the spinodal region then for a.e. there is an even number of such solutions…
We propose a simple model for the chevron structure observed in recent experiments by cooling a smectic A liquid crystal. We discuss the influence of the cell thickness and of the anchoring conditions on the temperature dependence of the layer tilt angle, and the formation of this structure in the vicinity of a smecti…
The structures of many binary solid-state chalcogenides (chalcogen = S, Se, Te) are known along with the structures of the related ternaries formed by addition of an alkali metal. Similarly, the structures of many ternary solid-state chalcogenides are known along with the structures of the related quaternaries formed…
"Electron theory in alloy design." International Materials Reviews, 38(3), pp. 154–155
Sol-gel entrapped Rh–, Pt–and Co-ammonium ion pairs formed by polymerization of (MeO)4Si in the presence of the appropriate metal halides and quaternary ammonium salts, are highly stable, efficient and recyclable hydrogen transfer catalysts.
[Bi(C6H6)Cl3, obtained from a benzene solution of BiCl3, has been shown by X-ray crystallography to be a layer polymer with very weak bismuth–benzene π-bonding.
X-ray analysis of Sn2P2(S1 − xSex)6 single crystals with 0 < x < 1 is performed in the temperature interval 70 to 400 K in which there exist the incommensurate modulated structures. Crystallographic characteristics of the modulation wave are obtained: the direction of a wave vector q at an angle 9° with respect to the…
The problems commonly encountered in the numerical analysis of reinforced structures are often related to biaxial stress states in the structure. In this study this problem is solved with the formulation of a composite plasticity model which describes both cracking and crushing of concrete within the framework of plas…
The adsorption of cationic potato starch on microcrystalline cellulose was investigated taking into account that starch is a mixture of amylose and amylopectin. The separate adsorption of both components could be calculated by determining starch concentrations twice using two methods having a different sensitivity for…
The general expression for angularly integrated electron-energy-loss functions for anisotropic materials is derived for arbitrary specimen orientations with respect to the incident angle of a fast electron. For uniaxial (tetragonal, trigonal and hexagonal) and biaxial (orthorhombic) crystal systems, the angularly inte…
The luminescence excitation and emission spectra of europium(III) and terbium(III) complexes of ethylenediamine (en) in dimethyl sulfoxide have been studied. The 7F0→5D0 spectra of EuIII and the values of the luminescence decay constant confirmed that trivalent lanthanides from 1 : 1, 1 : 2 and 1 : 3 inner-sphere comp…