Materials Literature
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NiO_x electrochromic films with small grain size(22 nm) have been prepared by using a liquid-nitrogen-cooled apparatus with a magnetron sputtering installation being equipped.When identical deposition parameters have been employed,relying on liquid nitrogen cooling substrates,the grain sizes of films can be controlled…
La_(0.7)Sr_(0.3)MnO_3(LSMO) target has been prepared by a Sol-gel method and the film of LSMO with the thickness of 187 nm has been deposited on a(012)-oriented LaAIO_3 substrate using the pulsed laser deposition technique.The transport and photoinduced properties of the LSMO film at different annealing conditions hav…
Ceria-based precursors doped with calcium, calcium-samarium and calcium-gadolinium were prepared by an improved homogeneous precipitation method using ammonium oxalate as precipitant, high purity reagents Ce(NO3)3·6H2O, Ca(NO3)2·4H2O, Sm2O3 and Gd2O3 were used as raw materi- als, urea was used as pH adjuster of the mi…
The Transient Analysis Task Committee has been formed to create a manual of practice for the application of hydraulic transient modeling in the design of transmission pipelines. At present, there is no stand alone manual of practice in the civil engineering profession that advises the Owner and Engineer on the basics…
Instructions pour fabriquer une flute a partir d’une branche de tremble ou d’un arbre similaire, coupee au printemps, lorsqu’elle contient de la seve.
以草酸铵为沉淀剂，以尿素为pH调节剂，以Ce（NO3）3-6H2O、Ca（NO3）2-4H2O、Sm2O3和Gd2O3为起始原料，采用改进的均相沉淀法合成前驱物，将其在700℃焙烧4．5h，分别制备出Ca掺杂及Ca-Sin和Ca—Gd复合掺杂的CeO2基纳米粉体．用X射线衍射（XRD）、扫描电子显微镜（SEM）和BET法等技术对焙烧粉体的物相、形貌、晶粒尺寸及比表面积进行了分析表征．结果表明，当混合金属离子的总浓度为0．5mol／L、沉淀剂浓度为0．05mol／L、起始水解pH值为1时，可制备出具有立方萤石型晶体结构及良好结晶性、粒度分布在34—39nm之间的球形纳米粉体．采用乙醇分散和洗涤掺杂前驱体沉淀，能有效地减轻焙烧粉体的团…
Abstract The sections in this article are Introduction Magnetic Noble Metal Alloy Nanoparticles Magnetic Early Transition Metal Alloy Nanoparticles Summary and Future Perspectives
The 12 papers in this special issue focus on surface interactions, plasma chemistry, and particle behavior near the surface.
Electronic-behavior modeling of three-dimensional (3D) p + -π -p + and n + -ν-n + semiconducting diffusible devices with highly accurate resistances for the design of analog resistors, which are compatible with the CMOS (complementary-metal-oxide-semiconductor) technologies, is performed in three dimensions with the f…
We introduce a family of materials which are homogeneous and which posses a negative index of refraction at optical frequencies. The desirable negative effect is not based on the chirality of the molecules, but rather on two other ideas (A.-G. Kussow and A. Akyurtlu, Phys. Rev. B, 78, 205202 (2008)): Firstly, there ar…
Nanogratings with chiral geometry are found to produce artificial optical activity (i.e., the ability of rotating the light polarization), though the composing materials are not optical active. This paper presents a thorough review of our recent study, from theory to experiment, on the optical activity in two types of…
An inorganic silsesquioxane and organic 4-vinyl biphenyl chromophore based dendrimer was synthesized and the steric hindrance of the dendrons was used as a trigger to control the photophysical properties in the near-UV and blue spectral ranges. Consistent photoluminescence quantum yields and time resolved fluorescence…
用液态金属冷却技术(LMC)和传统的定向凝固技术(HRS)制备了名义成分为Ni-33Al-31Cr-2.9Mo-0.1Hf-0.05Ho (%,原子分数)的定向合金,研究了制备工艺对其组织的影响.结果表明,合金由初生NiAl枝晶、NiAl/Cr(Mo)共晶胞和少量Hf固溶体组成.与HRS工艺相比,LMC工艺能提高固液前沿温度梯度和冷却速度.较高的固液前沿温度梯度扩大了NiAl/Cr(Mo)共晶共生区成分范围,减少初生NiAl枝晶的体积分数.而较高的冷却速度抑制固溶元素扩散,细化定向合金的组织,增加合金中固溶元素总量.另外,LMC工艺能避免HRS工艺中产生的生长缺陷,包括斑点、NiAl一次枝晶的偏转和NiAl一次枝晶的不连续.
Abstract The sections in this article are Introduction Magnetic Nanoparticle Synthesis Nanoparticle Functionalization Surface Adsorption Ligand Exchange Silanes and Siloxanes Monolayer Reactions Encapsulation Encapsulation: Silica (SiO2) Encapsulation: Metallic and Semiconductor Shells Encapsulation: Polymeric and Car…
对锰含量为18．8％的TRIP／TWIP钢进行单轴拉伸实验，研究了这种钢的应变硬化行为．结果表明：这种高锰TRIP／TWIP钢的真应力应变曲线不完全遵循Hollomon的线性关系，在不同变形阶段强化机制不同．在塑性变形的开始阶段TRIP效应比较明显，且应变硬化指数n是恒定的；而真应变在0．14—0．35之间时二阶导数d^2σ／de^2〉0，应变硬化指数n随着应变量的增加而增加，其微观机制是形成大量的形变孪晶，并有孪晶和位错的交互作用，TWIP效应在该阶段占主导作用．真应变大于0．35后有少量TRIP效应，此时两相均发生变形．
Die vorliegende Arbeit beschäftigt sich mit der experimentellen Untersuchung von fokalkonischen Domänen in smektischen Flüssigkristallfilmen auf festen Substraten. Fokalkonische Domänen sind komplexe Strukturen in smektischen Phasen, die eine wichtige Rolle in der zukünftigen Entwicklung von neuartigen weichen selbsto…
Abstract The sections in this article are Introduction Physico‐Chemical Properties of Magnetic Nanoparticles Surface Coating for Improved Biocompatibility and Bioavailability MRI for In Vivo Diagnostics Principles of MRI SPIOs as MRI Contrast Agents Specific Targeting of Tumors for Imaging MRI for the Monitoring of Tr…
用溶胶-凝胶（Sol—gel）法制备La0.7Sr0.3MnO3（LSMO）靶材，用脉冲激光沉积（PLD）法在LaAlO3（O12）基片上沉积出厚度约为187nm的LSMO薄膜，研究了真空退火对薄膜的输运和光诱导特性的影响．结果表明，薄膜的相变温度随着退火时间的增加而降低，薄膜的电阻率升高．在低温金属相光照使电阻率降低，在高温绝缘相光照则使电阻率升高．随着退火时间的增加，光电导（△p）先增大而后减小，在真空条件下退火40min的薄膜光电导（△p）达到最大值为0．013Ωcm．根据双交换作用解释了薄膜光电导的变化规律．
Abstract : The goal of this program was to identify applications for which the unique properties of the nitrogen-vacancy (NV) diamond magnetometer gives a significant advantage. Most of the effort concentrated on improving the sensitivity of a single NV to the level where it could be used to detect a single nuclear sp…
Anomalous origin of the left coronary artery from the pulmonary artery (Bland-White Garland Syndrome) is extremely rare. With surgical reestablishment of two-coronary system on diagnosis yields excellent results with progressive nearly total myocardial recovery. A 30-year-old woman was admitted to hospital due to shor…