Materials Literature
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A series of Fe–13Cr–15Mn alloys with different nickel levels of 0–15% have been examined by transmission electron microscopy and X-ray microanalysis following irradiation to 17–25 dpa at 693–823 K. All specimens were found to have developed typical features of radiation damage at high temperature; voids, dislocations…
The phenomena in the sintering process of Y2O3-added mullite ceramics and the crystallization behavior of liquid phase in sintered bodies were studied using differential thermal analysis, X-ray powder diffractometry, scanning and transmission electron microscopies. The mullite powder compacts containing 2-10wt% Y2O3 w…
An attempt has been made to develop the manganese-based and workable damping alloys containing 20 at% copper, together with 2 or 5 at% additive elements, such as nickel, iron, cobalt, vanadium, chromium, zirconium, titanium, aluminum, zinc and tin.Nickel was the most effective element for increasing damping capacity o…
The coordination state of Ge ions in PbO-GeO2 glasses was examined using EXAFS. It was found that a part of Ge ions changed from 4-fold to 6-fold coordination state on addition of PbO, which had been expected from the property-composition relations. The fraction of 6-fold coordinated Ge ions, N6, increased with increa…
キチン・キトサンについてProskyらの方法(Prosky法)での食物繊維としての定量性を検討することを目的に,キチンおよび脱アセチル化度の異なるキトサンを粗繊維法,NDF法, Prosky法でそれぞれ定量した.キチンは粗繊維法で定量すると88.9%であったが,キトサンはほとんど定量されなかった.キチン・キトサンのNDF値は94.9～103.2%0であった.また, Prosky法で総食物繊維(TDF)値を定量したところ,キチン・キトサン共に60%程度の値であった.そこで,酵素処理残渣中の粗蛋白値をケルダール法で楚量する際,残溢中のキチン。キトサン由来の窒素量を残渣中の総窒素量より差し引く補正を行った結果.キチンのTDF値は90.6…
The exposed specimens in a marine atmosphere for 10 years were examined to know the pitting behavior of stainless steels. The linear relation was observed between the logarithm of the maximum pit depth and the logarithm of the exposure year, and the slope of the line was around 0.6. The pitting resistance of stainless…
Abstract The paper discusses several feasibility prediction criteria with particular emphasis on light atom molecules. For several examples of refined absolute structures, feasibility predictions are calculated and compared with a posteriori calculated values of the Bijvoet ratio. An extension of the Pathasarathy tabl…
A systematic study was carried out to evaluate the effects of processing on the microstructure of a Nb-1wt.%Zr-0.1wt.%C alloy sheet. The samples were fabricated by cold rolling different sheet bars that were single-, double- or triple-extruded at 1900 K. Heat treatment consisted of one- or two-step annealing of differ…
A variety of steel powders for bearing applications, such as high-speed tool steel, M50 and 440C steels, etc., prepared through vacuum induction melting (VIM) and inert gas atomizer were canned and consolidated by hot extrusion to bars for specimens used in this experiment. The carbide sizes of the extruded materials…
The electron density in synthetic calcite, CaCO3, has been determined using diffraction data for a naturally faced single crystal measured with X-ray Mo Ka (A = 0.71073/~) radiation. Extinction corrections that minimize differences between equivalent reflection intensities are closely approximated by the values which…
Fluorapopbyllite, KCa 4 Si 8 O 20 F.nH 2 O, n(H 2 O) = 8, was dehydrated at 473 K to an average of n(H 2 O) = 4. Rietveld analysis of neutron powder diffraction data from the partially dehydrated sample showed no evidence of a crystalline hemi-dehydrated form of fluorapophyllite. The dehydration process is described a…
希土類元素(La,Ce,Pr,Nd)のプロピオン酸塩一水和物の熱分解過程を熱重量測定(TG),示差熱分析(DTA)および示差走査熱量計(DSC)などによって研究した。出発物質および熱分解によって生成した化合物の組成を赤外吸収スペクトロスコピー(IR)と粉末X線回折計で同定し,さらに元素分析,化学分析およびICP発光分光分析により定量的に求めた。無水和物から酸化物への熱分解過程中に発生する気体をガスクロマトグラフィーで分析した。一水和物の脱水反応は一段階で連続的に進行し, 脱水過程中には中間水和物の生成は認められなかった。無水和物は融解現象を示し,その融解熱はつぎのような値が得られた。La:18.82kJ・mol-1,Ce:9.23…
2種のヒドロキシアパタイト(HAP)試料(A),(B)を種々の濃度の塩化ナトリウム(NaCl),酢酸ナトリウム(NaAc),あるいは硫酸ナトリウム(Na2SO4)水溶液に懸濁させ(添加濃度2g/dl),溶解平衡に達したのち溶出したリン酸イオン濃度[Pi]とカルシウムイオン濃度[Ca2+]および母液のpHを調べた。[Pi]増大におよぼす添加電解質の作用の強さの序列はNa2SO4>NaAc>NaClとなり,[Ca2+]増大におよぼす添加電解質の序列は逆にNaCl>NaAc>Na2SO4となった。また懸濁液のpH増大におよぼす電解質の序列は[Pi]の場合と同じであった。これらは2種の試料に共通してみられたのでHAPの特性であると結論した…
Styrene and its derivatives form coloured charge transfer complexes with tetranitromethane as the acceptor. These complexes are stable in acetonitrile under neutral conditions in the dark for several days. Photochemistry of these complexes was found to be highly dependent on the structure and substituent effects on th…
Abstract The temperature dependence of the thermal expansion, the dielectric constant, the pyroelectric current and the remanent polarization in polycrystalline samples of Ba(Ti 1‐ x Sn x )O 3 was measured. The influence of the external electric field and Sn‐substitution on the character of all phase transitions was i…
Polysiloxane films were prepared by plasma polymerization and dip coating. Upon these films PEG was grafted by conventional methods, and ethylene oxide by plasma activation. Before and after grafting the films were analyzed by contact angle and ESCA measurements as well as by FTIR-ATR-spectroscopy and TOF-SIMS. Furthe…
Recently, Chen et al. have suggested that the Eu3+ ion luminescence from f-f transitions could be used as an alternative to x-ray diffraction in the determination of crystal structure. From the results of the room-temperature luminescence data for three different host crystals only, the authors claim that this method…
Seventeen esters, derived from 4-n-alkoxy-3-fluorophenols and 4-(5-n-alkyl-2-thienyl)benzoic acids, have been prepared and their liquid crystal transition temperatures determined by thermal optical microscopy. On cooling the isotropic liquid, the SA-SC-SA sequence of phases reported for the octyloxy-octyl and octyloxy…
The characterization of the surface properties of ZrC films grown by thermally evaporating ZrC onto room temperature W(100)and W(110) and then annealing, are reported. These films as deposited have no long range order as determined by low energy electron diffraction, but heating to above 1800 K produces well-ordered l…
Spatial dispersion effects in chiral liquid crystals are reviewed. New spatial dispersion phenomena are observed in the vicinity of the Bragg reflection wavelength–an anomaly of the refractive index and an optical anisotropy of the cubic blue phases. These effects can be explained by taking into account the spatial di…