Materials Literature
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The first example of a wholly aromatic rod-like macrocyclic mesogen has been synthesized by a two step polycondensation of catechol (C) with of 4,4′-biphenyldicarboxylic acid (B). Pure crystalline [2+2] cyclo-dimer was isolated from the polymerization mixture in 25% yield by a single silica gel column chromatogram and…
On the Raman scattering data for mixed crystals Sn 2 P 2 (Se x S 1 m x ) 6 additional bands with intensity maximum lying at the center, or at the sulphide and selenide ends of the concentration interval are related to the internal vibrations of various anion impurity configurations. Intensity of additional bands is pr…
The textile industry lacks an objective approach for determining the level of comfort and amount of free movement in narrow skirts. My research focused on developing a model for predicting the level of comfort and movement of narrow skirts sewn according to the fabric mechanical property of the Fabric Assurance by Sim…
Base hydrolysis kinetics of chloropentaaminecobalt(III) complexes of a range of acyclic and cyclic pentaamine ligands, incorporating the rigid -NH-CH 2 -C(CH 3 )(NH 2 )-CH 2 -NH- motif, which must coordinate facially in octahedral complexes, are analysed in terms of ground state structural influences on hydrolysis rat…
A demand to increase current density of ULSI interconnections with shrinkage of feature sizes inevitably brings about temperature rise due to Joule heating. We studied how temperature distribution changes with an increase in the current density and further investigated its effect on electromigration-induced failures.…
The structural and optical features of Porous Silicon(PS) were investigated; the porous silicon was prepared by electrochemical etching of silicon wafers in HF solution. The morphologies and Photoluminescence(PL) features of the PS were investigated in terms of etching time, current density and aging conditions. The a…
The operating environments of rolling bearings are remarkably varied. With the use of bearings in various corrosive environments increasing, interest in stainless steel is growing. AISI 440C has been widely used in applications where corrosion resistance is of primary concern. However, its performance has not always b…
The modifying effect of rare earth (RE) oxide on inclusions in hardfacing metals of medium-high carbon steel was investigated by means of thermodynamics. The t hermodynamic analysis for inclusion formation shows that RE oxide can be redu ced to RE element by carbon, then the RE element can react with oxygen and sulfu…
采用射频等离子体增强的热丝化学气相沉积(RFHFCVD)技术在石英玻璃衬底上制备了表面光滑、晶粒致密均匀的纳米金刚石薄膜.用扫描电子显微镜(SEM)和台阶仪观测薄膜的表面形貌和粗糙度,x射线衍射(XRD)和Raman光谱表征膜层的结构,并用紫外可见近红外光谱仪测量其光透过率.实验结果表明,衬底温度、反应气压及射频功率对金刚石膜的结晶习性、表面粗糙度及光透过率均有很大程度的影响,其最佳值分别为700℃,2×133Pa和200W.在该最佳参量下经1h的生长即获得连续、平滑的纳米金刚石膜,其平均晶粒尺寸为约25
Crosslinked polyethylene(XLPE) has been widely adopted as insulating material for high voltage power cables up to 500kV. Further improvement of electrical and thermal properties on insulating material is required in order to increase cable operation efficiency. Therefore, the development of novel insulating material p…
Tension tension cyclic fatigue tests were conducted at room temperature and at 1300℃ in 10 4 Pa vacuum under the condition with a sinusoidal loading frequency of 60 Hz and stress ratio of 0 1 for a three dimensional woven C fiber SiC matrix composite (3D C/SiC) prepared by chemical vapor infiltration (CVI) The results…
The body surface ultrastructures Henosepilachna vigintioctomaculata and H.vigintioctopunctata were observed. The depth of pits on the elytra and site of the chaetae in the pits had difference between two species.
The paper analyzes surface structure of scale of cashmere and wool.It adopts a series of methods such as cyclostyle substitution,thinning,short line filtration,boundary searching,figure tracking,broken dot analysis,inflexion analysis,broken dot linking and so on.It brings forward some relate index such as inner and ou…
新規セルロース誘導体であるカーボネート化セルロースの合成を検討した. トリアセチルセルロース (CTA) を原料として, ジフェニルカーボネート (DPC) をカーボネート試薬兼反応溶媒とするエステル交換反応によるフェニルカーボネート基の導入を行ったところ, その置換度は2付近にとどまった. そこで高置換度カーボネート化誘導体を得る目的で, 未修飾セルロースを原料として, ジメチルアセトアミドー塩化リチウム均一溶媒系においてセルロースヒドロキシル基へのフェニルカーボネート基の導入を検討した. その結果, 初めにカーボネート試薬としてDPCを用いた場合, 反応溶液はゲル化し, 生成物は各種有機溶媒に不溶となった. 次にカーボネート試…
Na1-x Li x NbO3 (0 x 0.006) and Na1—x K x NbO3 (0 x 0.10) solid solution crystals have been grown from the flux. Dielectric, X-ray and optical studies of the crystals revealed the presence of new phase transitions in the temperature range from—50C to 200C. The results obtained imply the necessity of substantial correc…
A systematic spectroscopic study of single ZnWO 4 :Fe crystals with different iron concentrations has been performed under excitation by ultraviolet light, by synchrotron radiation or under photostimulation by near-infrared light. The luminescence of Fe 3+ -related centres has been studied. It is shown that iron centr…
In the first part of this paper [Wild and von Collani, Economic Quality Control 17: 113-122, 2002] the Bruceton method and the underlying model assumptions for assessing the sensitivity of explosives were critically examined resulting in the recommendation not to use the Bruceton method. The second part describes an a…
Magnesium housings, which are lightweight, strong, and have high heat radiation characteristics, are in widespread use for portable personal computers and similar devices. Another characteristic of magnesium alloy is that it is a metal that can be melted for recycling. There are two ways of recycling magnesium alloy h…
The requirements for future ferroelectric non-volatile memories (FRAM) include lower operating voltages, higher densities and tighter design rules. In order to achieve these requirements the key component of the FRAM device, viz., the PbZr x Ti 1 m x O 3 (PZT) thin film capacitor must be scaled dimensionally to obtain…
Epoxidation of olefins was successfully achieved using molecular oxygen in the presence of an aldehyde and a catalytic amount of CuCl2 at room temperature. Hexanal was found to be a particularly good reducing agent for the CuCl2-catalyzed epoxidation. A good correlation was observed between the reactivity and the calc…