Materials Literature
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Abstract The paper proposes that the criterion of ‘eccentricity invariance’ should be considered when designing plate and shell elements. It shows that many such elements do not satisfy this criterion.
The relation between the stator current and the field current of a synchronous motor at a constant terminal voltage and with a constant shaft load is known to be a V curve. It is shown, by both experiment and calculations, that the stator current of a hysteresis motor also shows a V curve. The mechanism of the V curve…
ABSTRACT Arsenic acid is the principal chemical desiccant used to prepare cotton for harvesting by stripping on as many as 2 million acres annually in Texas and Oklahoma. Because the arsenic acid is applied when bolls are open, cottons from treated fields contain arsenic. The amounts present on cottons from desiccatio…
The hydrothermal stability of both Cr/polyimide and C75Cr2/polyimide interfaces has been studied using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and peel testing. It was found that RF sputter treatment of the polyimide surface prior to metal deposition leads to an enhancem…
A new Fourier expression of the Cahn-Hilliard’s flux equation is proposed, where the regular solution approximation is adopted as the chemical free energy of solid solution and the mobility of atoms is defined as a function of solute composition. The computer simulations of phase decomposition are successfully perform…
Abstract Die Verbindung Cs 2 Hg II Pd II Cl 6 läßt sich durch Festkörperreaktion phasenrein darstellen. Sie kristallisiert in der Raumgruppe I 4/m m m (No. 139) mit a = 7,432(4) Å, c = 10,874(7) Å, Z = 2. Die Kristallstruktur wurde mit röntgenographischen Methoden an Einkristallen ermittelt. Pd 2+ ist quadratisch‐plan…
A number of superconductors are found among binary and ternary boride compounds. The highest Tc’s are often found near a limiting composition for the compound’s stability. Ternary borides have been a fertile area for exploring the interaction between superconductivity and magnetism, and appear to be the area in which…
ポリエチレンテレフタレート (PET), ポリエチレン, シリコーンなどの疎水性高分子にアルゴンプラズマ処理した後, XPSスペクトル測定, 走査型電子顕微鏡 (SEM) 観察のほか接触角測定などにより, 表面性状の分析を行った. プラズマ処理の後, 空気と接触させると効果的に表面酸化が起こり, 親水性の極性基が導入されることがXPS測定によりわかった. しかし, 表面親水化されたPETフィルムは時間とともに再び疎水性表面に変化した. これは, 表面に導入された極性基がしだいにバルクへ移行するためと考えられる. 親化PET表面の疎水化速度は, 放置雰囲気や温度に影響され, 空気中放置の場合, 温度が高いほど大きくなり, 水中とか弱…
機械的エネルギーの有効利用と無機微粉体の表面改質の双方の見地から, メカノケミカル重合反応を利用した微粉体の表面改質法について検討した.メカノケミカル重合反応は, 窒素雰囲気下メタクリル酸メチル溶媒中で石英を粉砕することで行った.用いた粉砕機は振動ボールミルで, ミル容器およびボールは窒化ケイ素製である.実験は, 窒素雰囲気下で石英の濃度を変化させて行い, 石英の比表面積とポリマー転化率の経時変化を調査した.その結果, 重合反応は粉砕性と密接に関係し, ポリマー転化率は石英の生成全表面積におおよそ比例すること, わずかのポリマー量で石英表面は十分に疎水性に表面改質されることなどが明らかになった.本法は, 他の無機物固体についても適…
Two commercial PET yarns, one as-spun and the other highly crystalline and drawn, were annealed at l8°C under various conditions. Mechanical and thermal-response measurements were made under high transient-heating conditions by using a UMIST-built Universal Fibre Tester (UFT). Differential-scanning-calorimetry (DSC) m…
The structures of (K½Na½)TiOPO4 and (Rb½Na½)TiOPO4 have been determined from Rietveld analysis of powder diffraction data, the former from a joint analysis of time-of-flight neutron and X-ray data, the latter from constant wavelength neutron data: Pn21a, (K½Na½)TiOPO4a= 12.75613(7)Å, b= 10.60426(6)Å, c= 6.31869(4)Å; (…
Calcareous nannofossils from Man Aike Formation are described and illustrated from SEC-7 well, located near Cardiel Lake, Santa Cruz Province, Argentina. The nannoflora contains Neococcolithes dubius, Zigrhablithus bijugatus, Reticulofenestra umbilica, R. dictyoda, Braarudosphaera bigelowi, Transversopontis pulcher, T…
We systematize available thermodynamic information on transition metal diborides, with emphasis on the enthalpy of formation, the vibrational entropy and the melting temperature. When experimental information is lacking, e.g., for metastable compounds, we obtain estimates through interpolation and extrapolation proced…
Thermal conductivities of dense pure hematite, magnetite, wustite and iron have been measured by the laser flash method in the temperature range from room temperature to 1 553 K. The relatively high thermal conductivities of dense pure hematite, magnetite and wustite at low temperature were found and these values decr…
The addition of titanium to standard 625 grade enhances the age-hardening response, enabling yield strengths greater than 800 MPa to be obtained by simple, industrially compatible, heat treatments. The effect of such treatments on microstructure have been studied, together with their influence on the strength/toughnes…
Effects of neutron irradiation and iodine as a corrosive fission product on the fatigue behavior of Zircaloy-2 fuel cladding tubes were investigated using two different types of test specimens in order to evaluate the fatigue strength of BWR fuel subjected to such variable loading conditions as load following or autom…
A factorial-analysis technique is applied to study the effects of strand spacing, twist, and spindle speed on the hairiness of double-rove yarn. A wide range of twist levels and spindle speeds is covered by spinning yarns from two different types of fibres, namely, cotton and a polyester-fibre/cotton blend, in order t…
2014 La matrice de carbure de silicium des composites SiC/SiC a t examine d'un point de vue chimique et structural par spectroscopie de pertes d'nergie d'lectrons (EELS) et par microsco- pie lectronique haute rsolution (MEHR). La croissance colonnaire des cristaux de la matrice et leur distribution radiale par rapport…
The literature of the past two decades suggests that confusion persists concerning the role of director fluctuations in the theory of nematics. Are these fluctuations necessarily small? If so, the fluctuation spectrum must terminate at a wavevector q c which is of the order of 109 m−1, yet fluctuation modes with wavev…
The i. r. spectra of benzimidazol-2-thione have been measured from 4000 to 180 cm−1; polarized spectra of single crystals have been also obtained. The Raman spectra of polycrystalline samples and solutions have been recorded and the polarization of many lines has been determined. Most vibrations have been assigned on…