Materials Literature
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The combustion of 0.32-cm-diameter pure iron rods in gaseous oxygen under normal and reduced gravity conditions has been investigated to determine whether the upward Regression Rate of the Melting Interface (RRMI) and other burning characteristics are affected by the type of igniter material (wire) used. The experimen…
Combined Scale Removal and Scale Inhibition Treatments P.S. Smith; P.S. Smith BP Amoco Search for other works by this author on: This Site Google Scholar C.C. Clement, Jr.; C.C. Clement, Jr. BP Amoco Search for other works by this author on: This Site Google Scholar A. Mendoza Rojas A. Mendoza Rojas Ecopetrol - Instit…
In the present article we review several postembedding cytochemical techniques using the colloidal gold marker. Owing to the high atomic number of gold, the colloidal gold particles are electron dense. They are spherical in shape and can be prepared in sizes from 1 to 25 nm, which renders this marker among the best fo…
A coalescence mechanism for the coarsening behavior of polymer blends during a quiescent annealing process is proposed, in which the effect of different particle sizes is taken into consideration. All existing forces, such as thermal agitation, van der Waals attraction, interfacial tension, and viscous resistance, con…
自然界で微生物によりH2OとCO2に完全に分解されるポリ-β-ヒドロキシ酪酸 (PHB) とポリカプロラクトン (PCL) をベースにして, 生分解性プラスチックスの開発を試みた. ダンベル型試験片およびシートの機械的性質の検討で, PHBの欠点である伸び率および衝撃強度, またPCLの欠点である弾性率はPHBにPCLを40～60% 混合することにより改善された. さらに, PHB, PCLおよびPHB/PCLの混合物について押出ブロー成形を行ったところ, PCLおよびPHB/PCLの混合物で成形ボトル (500L容) を得ることができた. これらの成形ボトルの酸素透過率は, PHBの混合割合が増加するに従い低下し, PHB/PC…
This research assesed the technical feasibility of the production of mineral boards, through the utilization of Eucalyptus dunnii particles, and evaluated th...
Electrochemical proton reduction was catalysed by zinc phthalocyanine ( ZnPc ) incorporated in a Nafion or poly(4-vinylpyridine-co-styrene) (P(VP-St)) film coated on a graphite electrode. The turnover number (TN) of the complex to catalyse H 2 evolution was 10 4 h -1 . The TN of Nafion[ ZnPc ] was about two times high…
Blends of polyurethane and EVA elastomers prepared by two different techniques, in different blend ratios, have been studied. Blend properties largely depended on the blend ratio and also blending techniques. Preheating technique offered better properties. IR spectral analysis revealed that on heating interchain cross…
Effects of the excimer laser irradiation on regenerated cellulose fibers were investigated. The surface structure change was remarkable only when the ArF laser was applied. Small pores and fibrils were observed on the fiber surface at the high fluence irradiation. In some cases, several cracks were observed inside the…
We report the studies on the frequency dependence of the complex permittivity, and on the electromagnetic interference (EMI) shielding of conductive blends. The blends were obtained from conjugated oligomers of (p-phenylene-1,3,5-hexatrienylene) end-capped by Schiff base units and dispersed in an insulating matrix of…
We have calculated the phase diagram of a fluid, the molecules of which are composed of a string of partially overlapping oblate soft ellipsoid interaction sites, by molecular dynamics simulation. The molecules are elongated in one direction and flattened in the perpendicular direction so that they become biaxial. We…
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…