Materials Literature
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Hydrogenases play crucial roles in the hydrogen metabolism by catalyzing the production and decomposition of H2. The membrane-bound [NiFe]-hydrogenase is a representative member of O2-tolerant hydrogenases, but the mechanism of which is poorly understood. Recently, we and other groups have reported the crystal structu…
摘要： 通过恒温拉伸机对固溶处理与冷轧加工后的SAF2906双相不锈钢进行恒温拉伸试验，分析其在不同条件下超塑性伸长率的变化。利用扫描电镜与透射电镜对其进行内部组织观察，了解其两相比例的变化情况。试验结果表明，SAF2906双相不锈钢中铁素体相(δ相)与奥氏体相(γ相)的两相体积比随固溶温度的变化而改变，随着固溶温度的升高铁素体比例不断上升，其中当铁素体与奥氏体的两相体积比接近1∶1的情况下，SAF2906双相不锈钢展现出良好的超塑性性能；在机械加工方面可以通过提高冷轧压下量的方法提高SAF2906双相不锈钢的超塑伸长率，试验中试样的伸长率随着冷轧变形量的提高而明显增大，当固溶温度为1 100 ℃，冷轧压下量为85%时，变形温度为…
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Fe- or Fe and Ti-substituted Li2MnO3 positive electrode material (FM or FMT sample) with monoclinic Li2MnO3 type structure (C2/m) was synthesized using coprecipitation-hydrothermal-calcination. Both materials exhibited high specific capacity greater than 200 mAh/g against a Li metal negative electrode at moderate curr…
In these days, many repair examples of the concrete structure have been reported and the durability of concrete structure is taken up as an important issue. Outdoor exposure test is the most practical way to evaluate the durability of surface coating material on the concrete structure but it requires long time to comp…
This study aimed to develop a new method of increasing water content in the cutaneous stratum corneum under a dry skin condition. For this purpose, the experiments were performed using 10 healthy women (age: 20 ± 5 years, height: 158 ± 4 cm, weight: 50 ± 6 kg) in winter to ensure the dry condition. The subjects immers…
The purpose of research is to examine the possibility of lanthanum titanium oxide coating with sputtering. The evaporation material lanthanum titanium oxide showed that it could be used as optical thin films with sputtering equipment by optimizing coating condition.
In this study, we propose a new application of the technique for plasma nitriding of steel. The polarity of the applied voltage to a plasma gun was found to significantly affect the plasma formation. When the positive voltage was applied, a relatively large chamber was filled with the nitrogen plasma. The length of in…
本研究では，表面構造や界面科学的表面特性，分子運動に立脚する動的特性および生体分子との相互作用を高感度に分析するさまざまな解析手法を通して，バイオマテリアル表面を高度に制御することを目標としている．表面特性を定量的かつ総合的に解釈するためのモデル表面として，種々の化学構造からなるポリマーブラシ表面を，表面開始型原子移動ラジカル重合法により構築した．モノマーユニットの化学構造により種々の界面科学的な表面特性を制御した．タンパク質吸着挙動解析により，タンパク質吸着量が，タンパク質とマテリアル表面との直接的な相互作用力に起因することを見いだした．表面特異的な水和構造を定量的に解析する方法論を確立し，マテリアル表面のタンパク質吸着抑制効果…
An abnormal jump of emission current was observed in a single wall carbon nanotube(SWCNT) rope field emitter,in which two soda-lime glass flakes were set on both sides of SWCNT rope.It gave rise of an apparent enhancement of the emission current after the jump.All these peculiar characteristics of field emission were…
The thermal and mechanical properties of poly(L-lactic acid)/talc composites with different content of talc has been investigated. Non-isothermal crystallization shows that talc can serve as a nucleating agent for the crystallization and increase the overall crystallization rate of poly(L-lactic acid). The scanning el…
The optical nonlinearity of Triangular Silver Nanoprism solutions and composites with tuneable absorption wavelength is analyzed using z-scan with 130 fs pulses. A dependence of the nonlinear optical properties on the absorption intensity is observed.
This paper proposes a topology optimization procedure for magnetostrictive actuator problems. It is useful for the efficient geometrical design of actuator shapes because their shapes have been empirically designed and are not necessarily optimum. In the proposed topology optimization procedure, a level set field over…
摘要： 为了使汽车前纵梁在正面碰撞过程中吸收更多的能量，进而达到提高汽车被动安全性能的目的，将折纸工程中的反转螺旋型薄壁结构引入汽车前纵梁的结构设计，利用数值模拟与优化设计相结合的方法，研究和开发一种新型高效吸能结构。为此，根据反转螺旋型薄壁结构的不同形状参数建立相应的有限元模型，利用非线性有限元软件LS-DYNA软件进行碰撞仿真，并以反转螺旋型薄壁结构的截面形状参数、旋角及分段数作为设计变量，以吸能量的最大化为目标函数，利用响应曲面法进行优化计算。得到的最优结构在碰撞过程中，压溃皱纹依次出现在反转螺旋型薄壁结构的折痕处，有效地避免了细长薄壁结构的失稳倒伏现象，是一种吸能效率较高的变形模式。同时，吸能过程平稳，在整个碰撞过程中都保…
樹脂原料の混練挙動の簡単な統計力学的取扱いを試みる．この取扱いにおいて混練工程で過渡的に生じる原料粒子の多様な構造に起因する「構造多様性エントロピー」(「多様性エントロピー」)の概念を導入した．多様性エントロピーは，原料の混練工程において生じる粒子集団の異なる様相(状態)の数から計算した．多様性エントロピーは，各々要素粒子からなる線状体および塊状物について計算した．混練エントロピーは混合エントロピーと多様性エントロピーの和に等しいと仮定して，多成分系の混練自由エネルギーを導いた．混練転移領域の中間点が，混練コンパウンドの硬化熱の測定値から求めた多様性エントロピーの最大値と時間的に一致することを検証した．
To explore the effect of carbon black on the mechanical behavior of rubber material,9 kinds of rubbers filled with different volume fraction of carbon black are studied by quasi-static uniaxial tensile test,and the material constants of Mooney rubber are fitted through the least squares methods,then three-dimensional…
2011年4月通过灌河口邻近海域的现场调查及营养加富培养实验,研究了春季灌河口邻近海域浮游植物生态分布特征以及硝酸盐、磷酸盐对浮游植物生长的限制作用,结果表明:共发现浮游植物68种,其中硅藻61种,优势度最高的为中肋骨条藻(Skeletonema costatum, Y=0.53),各个站位浮游植物的丰度介于0.84×106-2.25×106个/L,均值为1.54×106个/L,种类范围为29-39种,均值为35种,叶绿素a浓度呈现近岸高外海低的特征,在2.66-6.67μg/L变化,均值为3.89μg/L,多样性指数介于2.60-3.79,均值为3.20,海域环境基本适宜浮游植物的生长;调查海域磷酸盐浓度的范围为0.35-0.9…
We report on three kinds of fiber lasers (Yb-, Er- and Tm:Ho-doped) mode-locked by the same graphene saturable absorber sample. The central wavelengths of the mode-locked fiber lasers are 1035, 1564 and 1098 nm, respectively.
采用注射成形工艺制备了Cu-Fe—C坯料，通过溶剂脱脂和热脱脂、烧结制备出Cu—Fe—C摩擦材料。研究了Cu—Fe-C摩擦材料的力学性能及摩擦磨损性能，重点分析了Fe含量对Cu-Fe—C摩擦材料性能的影响。实验结果表明：材料中铜颗粒之间存在的孔隙及石墨为主要的裂纹源和扩展途径，使材料发生脆性断裂；高硬度、耐磨的Fe颗粒分布于铜基体中，可以提高材料的硬度、强度；当Fe含量达到89／6时，材料的硬度为58HV，抗拉强度为148MPa；当摩擦速度为100～400r／min时，Fe颗粒的加入提高了材料磨损量、摩擦系数，降低了材料的磨损性能；高速摩擦条件下，Fe的加入促进摩擦表面氧化膜的形成，提高了材料的耐磨性能。
Изучаются процессы переноса в плоском слое вязкой несжимаемой жидкости со свободными границами в условиях действия дополнительных касательных напряжений, вызываемых внешней средой. Моделирование течения жидкости проводится на основе точных решений уравнений Навье-Стокса с последующим применением численных алгоритмов д…