Materials Literature
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摘要： 针对在广义刚度场中研究结合部对机床动态特性的影响以及动力学参数优化设计的需要，提出一种基于机床广义动态信息模型的结合部动刚度参与因子的概念和辨识计算方法。采用响应面方法(Response surface methodology, RSM)建立描述广义刚度场中机床轴端动刚度与结合部动力学参数关系的广义动态信息模型；以结合部动刚度单位变化值为广义动态信息模型的输入量，计算轴端动刚度变化值作为结合部动刚度参与因子的辨识依据。以精密卧式加工中心为对象，将该方法应用于立柱-主轴系统的导轨、滚珠丝杠结合部动刚度参与因子辨识和试验验证。结果表明，该方法可以有效地识别出对机床动态特性影响较大的关键结合部，从而为结合部动力学参数的定量优化设…
For the phase and microstructure selection during directional solidification of peritectic alloys,the solute distribution ahead of the solid-liquid interface plays a fundamental role.To study the solute distribution under convection condition,the convection factor(Δ) was introduced into the boundary layer model and Bo…
TiO2 nanocrystals of the anatase, rutile, and brookite polymorphs have all been selectively synthesized via oxidation of titanium trichloride under proper conditions. The results showed that phase selection is largely controlled by reaction kinetics, and is influenced by solution pH and solute concentration. Morpholog…
This study examined the mechanical properties of aligned multi-walled carbon nanotube (CNT)/epoxy composites processed using a hot-melt prepreg method. Vertically aligned ultra-long CNT arrays (forest) were synthesized using chemical vapor deposition with high growth rate, and were converted to horizontally aligned CN…
高圧ホモジナイザーで微粒化したpoly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS)分散液を用いてアルミ固体電解コンデンサを作製し，等価直列抵抗(ESR)と静電容量(Cap)について詳細に検討した．高圧ホモジナイザーの圧力を154 MPaまで上昇させるとコロイド平均粒子径は625 nmから5 nmに低下し，120 HzにおけるCapは9 µF/cm2から63 µF/cm2に増加した．一方，エチレングリコール(EG)の添加により，電気伝導度は0.02 S/cmから163 S/cm まで向上し，コンデンサのESRが顕著に低下した．さらに，分散液の微粒化…
We have prepared double perovskite La2CoMnO6 (LCMO) polycrystalline nanoparticles with different particle sizes (from 28 to 285 nm) by sol-gel method. Reitveld refinement of obtained XRD data illustrates crystal structural changes from pseudo tetragonal to ordered monoclinic phase with the increase of particle size. T…
Using one known series, we can structure several new series of reciprocals of binominal coefficients by splitting items. These denominators of series contains different the multiplication of one to five odd factors and binominal coefficients. And some identities of series of numbers values of reciprocals of binominal…
一般的にプリント配線板の絶縁材と導体間の密着強度が発現するメカニズムは，銅箔のマット面形状，または樹脂表面の粗化によって形成される凹凸を利用した投錨効果，およびファンデルワース力，水素結合で得ている。しかしながら，凹凸の存在により，高精細パターンの形成を阻害し，表皮効果の影響による高周波の伝送ロスが拡大する弊害も多い。これらの課題を解決する方法として，樹脂と金属間などの異種材料間を化学結合により接合する分子接合技術を，ポリイミドフィルム上への直接メタラズに応用し，高性能，安価でイノベーティブな新規両面FPCを開発，製品化を実現した。新規FPCのピール強度は，初期で15 N/cm，150°C168 h，および260°C5 minの熱…
Generally, low backlash mechanisms are required for robot joints to perform tasks accurately. In this paper, we propose a new concept of a low backlash reducer using precessing crown gears. We call it the crown reducer. The features of this reducer are low backlash, high reduction ratio and ease of downsizing which we…
This paper describes a simple method using Fenton reagent for treating the wastewater from the preparation of polyaniline. The method employs the absorption of UV-visible spectroscopy as a quantitative indicator of the byproducts. Some factors e.g., reactive time, temperature, pH and the concentration of FeSO4·7H2O an…
The surface smoothness, S and Ag content of electrodeposited copper were investigated to clarify the influence of chloride ions on electrorefining using hydrochloric acid and SbCl3. The surface smoothness of electrodeposited copper was improved with increasing amounts of hydrochloric acid and SbCl3 as well as lower S…
本研究は，りん酸塩処理した溶融亜鉛めっき接合面の高力ボルト摩擦接合継手における適切なボルト軸力導入方法およびすべり耐力を明確にすることを目的とした研究である．本研究では，ボルト径およびボルト長をパラメータとした試験体を作成し，ナット回転法を用い，その回転角を変化させてボルト締付けを行った．そして，ボルト導入軸力を調べ，さらに，リラクセーションも考慮して適切なボルト軸力が導入されるナット回転角を提案した．提案したナット回転角を用いてすべり試験体を作成し，すべり耐力試験を実施した．これらの結果から，提案したナット回転角の妥当性を検証した．
The aim of this work is to analyze some new experimental data of pyrolysis of thick woody biomass particles with the help of a general and comprehensive mathematical model. This multiphase and multiscale problem involves strong interactions between chemical kinetics, both in the solid and in the gas phase, and heat/ma…
Tin doped Indium oxide films were prepared by the acrylamide Sol gel dip coating method. The films were post heat treated in air at different temperatures in the range 350 -450C. The films exhibited cubic structure. The films showed 85 % transmission and exhibited a resistivity of 1.0 x 10 -4 0hm cm. Dye sensitized so…
Tissue losses that may occur in certain burn wounds may heal spontaneously without requiring any surgical intervention. However, this spontaneous healing is usually observed in smaller and superficial burn wounds, whereas surgical intervention may be indispensable in the tissue damages that occur in deeper and larger-…
逆相モードの溶媒グラジエント高速液体クロマトグラフィーを用いて，共重合組成の異なるスチレン─メタクリル酸メチル共重合体の溶出挙動を解析した．スチレン含有量が12～91 mol％ のランダム共重合体，及びブロック共重合体，さらにホモポリマーであるポリスチレン（PS）とポリメタクリル酸メチル（PMMA）について，移動相の組成を貧溶媒であるアセトニトリル100％ から良溶媒であるテトラヒドロフラン100％ に直線的に変化させると，PMMA，ついでスチレン含有量の低い共重合体から順次溶出し，最後にPSが溶出した．また，ランダム共重合体とブロック共重合体では溶出挙動が異なり，同じスチレン含有量のブロック共重合体はランダム共重合体よりも遅れて…
Presented work shows the results of DSC measurement for six Sn based solders. The alloys Sn96Ag4, Sn99Cu1, Sn97Cu3, Sn96.5Ag3Cu0.5, Sn95.5Ag3.8Cu0.7 and Sn63Pb37 were studied in the temperature range from room temperature up to 400 C. The transformation temperatures for melting as well as for solidification were influ…
It has been nearly 27 years since the discovery of the first high temperature (high-Tc) superconductor on LaBaCuO by Benorz & Muller in 1986 [1], in which the mechanism of how high-Tc superconductor happening remain unsolved up until now. La2CuO4 are a parent compound for La2−xSrxCuO4 superconductor, where show antife…
锂空气电池是介于燃料电池和锂电池之间的一种新一代高性能绿色二次电池, 其理论比能量高达11140 Wh/kg (Li), 是锂离子电池的6~9倍, 同时具有输出电压稳定、环境友好等优点, 应用前景广阔. 电解液是电池中重要的组成部分, 在决定电池的电化学性能方面起着至关重要的作用. 综述了锂空气电池中有机电解液、离子液体和固态电解质等三种非水基电解质的研究进展, 系统阐述了各电解液不同化学性质(电化学稳定性、离子导电率、极性)、物理性质(如介电常数、黏度、氧气溶解度、吸湿性)和物理化学性质(对阴极材料的浸润能力等)对锂空气电池放电比容量、大电流放电能力和循环性能的影响, 并对其未来的发展方向进行了展望.
The principle of critical energy (PCE) and the concept of specific energy participation introduced by this principle, a dimensionless power dependent variable, allows the superposition of effects via algebraic summation, in the case of loads of the same nature but of different types, as well as in the case of loads of…