Materials Literature
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Titanium alloys for medical implants were casted using 5∼20 mass%Zr, 10∼20%Sn, 4∼8%Nb, 2∼4%Ta and 0∼0.2%Pd as alloying elements instead of using harmful Al and V.The alloys were forged in their α and α+β regions followed by annealing at 973 K for 7.2 ks. The annealed microstructures of the alloys consisted mainly of t…
To measure grain orientation in SEM with high accuracy a new EBSP calibration software is developed. Grain orientation determination is simply based on marking three zone axes in the live EBSP. The EBSP‐technique has been applied to study misorientation between subgrains in high purity and commercially pure aluminium.…
The synthesis of novel liquid-crystalline heteroaromatic compounds incorporating the five membered thiophene and furan rings is described. The objective of the present work is to substitute the mesogenic units styrylthiophene, styrylfuran, phenylthiophene and phenylfuran for the aromatic structural units styrylbenzene…
At moderate temperatures, the elastic properties of natural MgAl2O4 spinel differ in several significant ways from properties of synthetic spinels. Below 1000 K, the ultrasonic resonant frequencies of an ordered natural spinel change significantly after heat treatment; at higher temperatures, both types of spinels hav…
Abstract Thermal recovery of radiation defects and microstructural change in UO2 fuels irradiated under LWR conditions (burnup: 25 and 44 GWd/t) have been studied after annealing at temperature range of 450-1,800°C by X-ray diffractometry and transmission electron microscopy (TEM). The lattice parameter of as-irradiat…
Recent work on the development of liposomal magnetic resonance (MR) contrast agents has yielded structures with higher overall relaxivity than that of other nanoparticles of similar diameter. Liposomes incorporating membrane-bound complexes of manganase ("memsomes") produce greater hepatic enhancement per micromole of…
Ammonia plasma generated by electrical discharge at low pressure was employed for the surface modification of PTFE and ePTFE. A new chemistry at the plasma treated surfaces is reported. X-ray photoelectron spectroscopy studies showed the incorporation of C-N, C-O, C = O etc functional groups on the plasma treated surf…
The hydrogen-treated (at 623 and 773 K) Pt/TiO2–SiO2 catalyst was characterized by using Pt L-edge X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), and electron paramagnetic resonance (EPR) spectroscopies to elucidate the role of the dispersed TiO2 in establishing the str…
Variable take-off angle and cold-stage ESCA measurements were utilized to analyze the surface composition of five polyurethane block copolymers. The polymers studied included a PTMO-polyurethane control, a carboxylated version of the control polyurethane, and three different peptide grafted (GRGESY, GRGDSY, and GRGDVY…
Previous work on fabric hand evaluation is reviewed. By using a multiple regression approach, four models, namely, a linear model, Webber-Fechner's law, Kawabata–Niwas's law and Stevens's law, for primary hand prediction have been compared. That results show that deviations from Stevens's law are much smaller than tho…
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…