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Optical Third-Order Nonlinearity of Triangular Silver Nanoprisms

Astrid Wachauer、Jing Jing Wang、John M. Kelly 等 4 位作者2013-01-01Nonlinear Optics

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.

Gold and Silver Nanoparticles Synthesis and ApplicationsNonlinear Optical Materials StudiesLaser-Ablation Synthesis of Nanoparticles

Topology Optimization of Magnetostrictive Actuator Problems Based on the Ideas of Level Set Method and Phase Field Method

Masahiro Mishina、Takanori KATOH2013-01-01TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

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…

Topology Optimization in EngineeringMagnetic Properties and ApplicationsAdvanced Mathematical Modeling in Engineering

Optimum Design on the Crash Energy Absorbing Ability of Reverse Spiral Cylindrical Thin-walled Structure

Lingli ZHOU2013-01-01Journal of Mechanical Engineering

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…

Cellular and Composite StructuresHigh-Velocity Impact and Material BehaviorStructural Response to Dynamic Loads

Statistical Mechanical Treatment of Diverse Structures of Particles that Appear during the Kneading of Resin Materials

Kyosuke Miki2013-01-01KOBUNSHI RONBUNSHU

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.

Engineering Technology and MethodologiesMaterial Properties and ApplicationsPolymer Science and Applications

Study on Macroscopic and Microscopic Mechanical Behavior of Carbon Black Filled Rubber Composite

Li Qin2013-01-01OpenAlex

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…

Polymer Nanocomposites and PropertiesNatural Fiber Reinforced CompositesElasticity and Material Modeling

Ecological distribution and nutrient limitation of phytoplankton in adjacent sea of Guanhe Estuary in spring

方涛 FANG Tao、贺心然 HE Xinran、冯志华 FENG Zhihua 等 4 位作者2013-01-01Acta Ecologica Sinica

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…

Microbial Community Ecology and PhysiologyDiatoms and Algae ResearchEnvironmental Science and Water Management

Graphene film for broadband mode-locked fiber lasers

Bo Fu、Yi Hua、Xiaosheng Xiao 等 4 位作者2013-01-01Asia Communications and Photonics Conference 2013

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.

Diamond and Carbon-based Materials ResearchLaser-Matter Interactions and ApplicationsAdvanced Fiber Laser Technologies

注射成形Cu-Fe—C摩擦材料的性能

乔斌、周海霞、李化强 等 6 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni

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。

Powder Metallurgy Techniques and MaterialsMetallurgical and Alloy ProcessesMetallurgy and Material Science

Numerical Modeling of Heat Transfer in a Free Liquid Layer Under Action of Thermocapillary Forces and Additional Tangential Stresses

А. Ф. Воеводин、Olga N. Goncharova、О. А. Кондратенко2013-01-01Izvestiya of Altai State University

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…

Solidification and crystal growth phenomenaCoal Combustion and Slurry ProcessingAquatic and Environmental Studies

High Energy-Resolution Electron Energy-Loss Spectroscopy Study of the Dielectric Property of Hexagonal Diamond Nanoparticles

Yohei Sato、Masami Terauchi、Wataru Inami 等 4 位作者2013-01-01Nihon Kessho Gakkaishi

Electronic structure of hexagonal diamond(h-DIA)was investigated by using high energyresolution electron energy-loss spectroscopy(EELS)based on transmission electron microscopy. The dielectric function of h-DIA was derived by Kramers-Kronig analysis of the EELS spectrum. Core electron excitation spectrum of h-DIA reve…

Diamond and Carbon-based Materials ResearchElectronic and Structural Properties of OxidesAdvanced Materials Characterization Techniques

Ag / ZnS 核壳结构纳米棒的制备及其光催化性能分析

方力宇、Hua Zhang、董海亮 等 5 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni

在制备的Ag纳米线的基础上,用水热法合成了Ag/ZnS核壳结构纳米棒。使用x射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、X射线能谱仪(EDS)、高分辨透射电子显微镜(HRTEM)、紫外一可见双光束分光光度计(UV.vis)、光致发光扫描仪(PL)等检测设备对样品的成分、形貌、微结构及光学性能进行了表征。结果显示,制备的Ag/ZnS复合材料为ZnS纳米颗粒包覆Ag纳米线的核壳结构,其紫外吸收峰位于350nm处,相对于ZnS纳米颗粒变宽并发生红移,PL发射峰位于462nm处,相对于ZnS纳米颗粒发生了蓝移,强度明显降低。光催化结果显示,Ag/ZnS核壳结构纳米棒的光催化性能优于ZnS纳米颗粒,分析了光催化反应机理。

Surface Modification and SuperhydrophobicitySupramolecular Self-Assembly in MaterialsSolar-Powered Water Purification Methods

Study of Chemical Structure and Removal of Positive-Tone Novolak Resist Having Various Prebake Temperature using Wet Ozone

Yukihiro Angata、Yousuke Goto、Seiji Takahashi 等 8 位作者2013-01-01KAGAKU KOGAKU RONBUNSHU

プリベーク(PB)温度の異なるノボラック系ポジ型レジスト(ノボラック樹脂+溶解抑制剤(PAC))の湿潤オゾンによる除去特性について,FT-IRおよびマイクロサンプリング質量分析法(μ-MS)による化学構造の変化,熱重量測定(Thermo Gravimetry Analyzer; TGA)による残存溶媒量の変化など種々の構造解析を行い評価した.PB温度を100–200˚Cまで変化させたレジスト膜は,湿潤オゾンによってすべて除去された.ただし,PB温度100–140˚Cではレジスト除去速度は変化せず,PB温度160˚C以上ではPB温度が高くなるほどレジスト除去速度が低下した.FT-IRスペクトルより,ノボラック系ポジ型レジストは160…

Advancements in Photolithography TechniquesSynthesis and properties of polymersPolymer Nanocomposite Synthesis and Irradiation

Behavior and its Effect of the Guest Atom in Clathrates Clarified by an Electrostatic Potential Analysis in the Crystal

Katsumi Tanigaki、Akihiko Fujiwara、Kunihisa Sugimoto 等 5 位作者2013-01-01Nihon Kessho Gakkaishi

A successful example of visualization of quantitative structure-property relationship, relation between the anomalous distribution/dynamics of the guest atom “rattling” and the reduction of thermal conductivity in type-I clathrates, is introduced. We found that the area governed by the weakly bounded guest atom in the…

Ferroelectric and Piezoelectric MaterialsAdvanced Thermoelectric Materials and DevicesSolid-state spectroscopy and crystallography

Effect of dangling bonds on the doped GaAs nanowires

Jiangong Cui、Xia Zhang、Xin Yan 等 7 位作者2013-01-01Asia Communications and Photonics Conference 2013

We have investigated the effect of surface dangling bonds on the doped GaAs nanowires by the first-principle density functional calculation. Our results show that the surface dangling bonds prefer to deactivate the p-type dopants.

ZnO doping and propertiesAdvancements in Semiconductor Devices and Circuit DesignNanowire Synthesis and Applications

Utilization of Synchrotron Radiation Powder X-ray Diffraction in Materials Science

Eiji Nishibori、Sachiko Maki2013-01-01Nihon Kessho Gakkaishi

Structural studies using multiple powder profiles were described with two examples. An algorithm for determining the element-selective charge density is developed using multi-wavelength anomalous synchrotron X-ray powder diffraction data. The method is employed in order to resolve the disordered structure of Yttrium i…

Fullerene Chemistry and ApplicationsBoron and Carbon Nanomaterials ResearchPolymer Nanocomposite Synthesis and Irradiation

Numeric Study of Quasi-Random Roughened Surface on Light Extraction of GaN LED

Yi-Zhu Lin、Duan-Yang Liu、Yinghua Du 等 5 位作者2013-01-01Asia Communications and Photonics Conference 2013

In this work, a roughened surface increasing the light output of LED was highlighted in numeric simulation. The roughening pattern was generated by imposing definite number of random distortions on the surface of LED.

Surface Modification and SuperhydrophobicityOptical Coatings and GratingsSurface Roughness and Optical Measurements

Ti-doped sapphire crystals grown by Kyroupolos technique and characterization

Nicolas Barthalay、H. Legal、G. Chériaux 等 4 位作者2013-01-01Advanced Solid-State Lasers Congress

High quality, large dimension TiSa crystals are required for achieving Petawatt femtosecond lasers. We will show recent results of TiSa crystals grown at RSA-Le Rubis by Kyropoulos technique achieving 10 cm diameter and high Figure-Of-Merit.

Glass properties and applicationsLaser Material Processing TechniquesSolid State Laser Technologies

A New Inverse Problem of Thickness Design for Bi-Layer Textile Material

向杰 李2013-01-01Advances in Applied Mathematics

本文基于低温环境下平行圆柱孔结构的纺织材料热湿传递稳态模型,研究了一类双层纺织材料厚度设计反问题。首先给出了一个双层纺织材料热湿传递稳态模型,并采用有限差分方法求解该问题。然后,根据服装热湿舒适性指标,将纺织材料内层厚度看成一个未知量,提出了一类双层纺织材料厚度设计反问题,将该反问题归结为一个最大概率最小模问题,采用罚函数法将该约束优化问题转换为无约束的优化问题,并采用粒子群算法求解。数值结果说明了双层纺织材料厚度设计反问题提法的合理性,以及粒子群算法的有效性和鲁棒性。 This paper studies a new inverse problem of estimating bi-layer textile fabrics t…

Thermoregulation and physiological responsesTextile materials and evaluationsColor Science and Applications

Phase field modelling of grain growth with particle pinning and solute drag

Sina Shahandeh2013-01-01cIRcle (University of British Columbia)

Second phase particles and solute atoms have been used as an important constituent in the design of materials and processes due to their ability to restrain the motion of grain boundaries. The drag effect occurs on a scale comparable to the particle diameter and interface thickness. However, to simulate grain growth w…

Aluminum Alloy Microstructure PropertiesSolidification and crystal growth phenomenaMetallurgy and Material Forming

Technologies for Obtaining Radio-pure Materials; Methods of Low Radioactivity Detection

K. Pelczar2013-01-01Acta Physica Polonica B Proceedings Supplement

This paper discusses selected problems arising from the presence of radioactive background sources in experiments searching for extremely rare processes. Physical properties of ^{42}K ions, present in argon as a progeny of ^{42}Ar, were investigated. A model of ^{42}K ions behavior in liquiefied argon is presented. Al…

Chemical Synthesis and CharacterizationGraphite, nuclear technology, radiation studiesNuclear and radioactivity studies