Materials Literature
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容器入り飲用水170検体の微量元素22種の濃度をICP質量分析法を用いて分析を行った. 試験溶液は, 調査対象元素に対する分子イオンの影響が小さい硝酸溶液とした. 添加回収実験の結果, いずれの元素も94%以上の回収率が得られ, CV値は0.2～3.9%と良好な結果が得られた. 温泉水使用のものではLi, B, Al, As及びMo, 海水使用のものではB, 鉱泉水使用のものではLi, Mn, Rb, Sr及びBaの濃度が全検体の平均濃度より高かった. 鉱水使用のものでは, 輸入品の平均濃度が高い傾向が見られた. 特に, Rb, Sr, Ba及びUでは有意差が認められた. 湧水使用のものでは, Li及びMnでは輸入品の平均濃度が高…
AM1 calculations are performed to study the molecular structures and the linear and non-linear polarizabilities of the donor–acceptor quinoid-type molecules under the influence of an external electric field defined by point charges (Sparkles). We investigate and compare the relationships between the molecular structur…
The Li3Fe2(AsO4)3 − x(PO4)x (x = 0, 1, 1.5, 2) solid solution was prepared by the ceramic method. Li3Fe2(AsO4)3 crystallizes in the monoclinic P1121/n space group with the cell parameters, a = 8.608(1), b = 12.215(1), c = 8.929(1) Å and γ = 90.76(1)°. The structure consists of a three-dimensional framework of vertex-s…
An FTIR study reveals the complex zwitterion (R2C−–Py+–H) in a polymeric chain of poly(4-vinylpyridine), which results from self-protonation of the latter in a pyridine solution. Presumably this complex ion, together with the observed strongly hydrogen-bonded network, is responsible for the formation of a gel with uni…
The vacancy model of the melting process is used as a starting point for deriving an expression for the pressure dependence of the melting temperature of alkali halides. The results obtained for the initial slope of the melting curve are compared with experimental data for 15 alkali halides and in most cases the agree…
This paper presents a mechanical model in which dynamic equilibriums of forces and moments are considered. This model is able to quantitatively describe twist distribution in the frictional contact zone inside a rotor in terms of yam, machine, and operational parameters. Four cases of the application of this model are…
In situ high temperature EPR measurements of the growth of the signal of substitutional Cr(III) ions have been used to study the diffusion of Cr in the rutile form of titanium dioxide. Two preparations, characteristic of the two main processes employed for the production of titanium dioxide, have been studied. The fir…
The results of equilibrium stress–strain and swelling experiments are reported for styrene–butadiene copolymers of varying crosslink density and varying butadiene microstructure. The orientation of polymer chains is investigated under uniaxial elongation by birefringence and infrared dichroism spectroscopies which pro…
The quantitative assessment of the displacive degree of a structural phase transition is discussed both from a microscopical and an empirical viewpoint. Using Monte Carlo results for the Φ4model as a qualitative guide, the relation between both perspectives is shown. Based on the general trends observed, an empirical…
Rüdenberg's well-known letter of 1951 contains two implications which still have not been employed so far in numerical computations: (1) Whenever all types of attraction and repulsion integrals are subject to the Rüdenberg approximations in its simplest form partially known already from Mulliken, the attractive, the C…
Pressure-shear plate impact experiments have been used to study the kinetics of martensitic phase transformations in polycrystalline NiTi—a shape-memory alloy. From symmetric impact experiments the limiting shear stress at which the transformation occurs is found to be 46 MPa. From experiments in which a thin NiTi foi…
We present our compilation of electron-impact cross sections for use in modeling the ionospheres/thermospheres of the Earth and planets. The sixteen species included are N2, O2, O, CO2, CO, NO, Ar, C, N, H, H2, He, CH4, C2H2, C2H4, and C2H6. The processes include electron-impact vibrational excitation, electronic exci…
Eliminating the Need for Scale Inhibition Treatments for Elf Exploration Angola's Girassol Field Van Khoi Vu; Van Khoi Vu Elf Exploration Angola Search for other works by this author on: This Site Google Scholar Christian Hurtevent; Christian Hurtevent Elf Exploration Production Search for other works by this author o…
RB (Rice-Bran) ceramics are new porous carbon materials made from rice bran, which is one of the main industrial wastes of Japan. The rice bran is at first mixed with phenol resin, and then, after forming, carbonized in nitrogen or vacuum atmosphere at higher than 900°C. The purpose of this study is to measure some me…
(opens in new window) Buy Article (opens in new window) Permissions and Reprints (opens in new window) All articles of this category (opens in new window) The synthesis of 2,3,5-trialkylpyrroles can be easily achieved by conjugate addition of nitroalkanes to 2-alken-1,4-dione (prepared by oxidative cleavage of 2,5-dia…
Combinations of failure mechanisms are frequently encountered in the life prediction of composite materials. A life prediction methodology is developed and applied to one such failure mechanism combination. This method uses experimental data and analytical tools to predict the long-term behavior of a composite under s…
Toughening mechanisms in polycrystalline ceramics were discussed based on Griffith's energy equilibrium. These mechanisms were classified into three groups: (1) The frontal process-zone toughening mechanism, which is related to the intrinsic fracture energy of a material, and creates a damaged zone ahead of the crack…
Recently, irradiation assisted stress corrosion cracking (IASCC) of austenitic stainless steels for core internal components materials become a subject of discussion in light water reactors (LWRs). IASCC has not been found in Pressurized Water Reactors (PWRs). However, the authors have investigated on the possibility…
By using the two-liquid geometric method and the three-liquid acid-base method, we are the first to determine the surface tensions of ladderlike polyepoxysiloxanes by the measurement of contact angles on thin films. Three kinds of ladderlike polymers have been synthesized: AC (which has the alkyl group and the epoxy…
During the studies on fouling diatoms in Zuary estuary the overlying surface diatoms were also studied for comparison. In all 66 spp. of planktonic diatoms have been recorded, belonging to 29 genera. Out of these, 36 species (16 genera) were Pennales and 30 (13 genera) Centrales. The common diatoms observed were Chaet…