Synthesis and Structural Characterization of Gd（Ⅱ） Coordination Polymer [Gd2（μ-phth）3（b-pd）（H2O）5]n

1 INTRODUCTION The polymeric metal complexes with extended structures are of great interest because of their useful chemical or physical properties[1]. Due to the noti- ceable fact that the aromatic polycarboxylate can provide versatile coordination mode and the non- coplanar structure of carboxylate groups and benze- ne rings, a lot of efforts in this field have been parti- cularly directed to the preparation of aromatic poly- carboxylate (such as phthalate, terephthalate and isophthalat…     

Direct transition of potential of water droplets to electric energy using aligned single-walled carbon nanotubes

In this paper, we report that an electromotive force (EMF) can be induced in a rope of aligned single-walled carbon nanotubes (SWNTs) when water droplets fall on this rope. The magnitude of this EMF depends sensitively on the slant angle of the SWNTs. Most interestingly, both the magnitude and the direction of the induced EFM can be modulated by applying a current to the SWNTs. The concepts of electrical slip and no-slip are proposed and can be quantitatively described by ``electrical slip resistance'. This kind of generator does not need any magnet, rotor, {etc} and shows quite a different operating mechanism and design compared with a conventional large scale hydroelectric power generator.     

用有限元模拟的方法研究大面积自支撑金刚石膜沉积过程中的热应力

建立了没有过渡层和有过渡层的有限元模型,对大面积自支撑金刚石膜沉积过程中的热应力进行了研究.分别计算了在常用金属材料钼、钨、镍作衬底和用镀有钛过渡层的钼作衬底的情况下,膜/衬底间的热应力分布情况.模拟与实验的结果表明,在大面积自支撑金刚石膜沉积过程中,采用镀有钛过渡层的钼作衬底有利于热应力的释放,从而可能制备出高质量的大面积无裂纹金刚石膜.     

用镀有钛过渡层的钼衬底制备无裂纹自支撑金刚石膜

为了解决金刚石膜脱膜开裂的问题,尝试了一种复合衬底,即镀有钛过渡层的钼衬底.利用直流等离子体喷射法在复合衬底上制备了不同厚度无裂纹的自支撑金刚石膜.用扫描电镜(SEM)、拉曼谱和X射线衍射表征金刚石膜的特征,并检测了其断裂强度.结果表明,用复合衬底制备的金刚石膜在950℃具有最小半高宽,在实验温度下所获得的金刚石自支撑膜的断裂强度均超过了500MPa.     

Observation of Weak Anti-Localization and Electron-Electron Interaction on Few-Layer 1T′-MoTe_2 Thin Films

Electronic transports of few-layer 1T'-MoTe_2 films are measured at temperatures down to 0.26 K. The lowtemperature conductivity exhibits logarithmic temperature dependence and negative magneto response. The negative magnetoconductivity can be well fitted by the two-dimensional weak anti-localization theory taking a single channel of electrons into account, with the parameters α≈-0.5 and l_φ∝ T~(-0 5). The logarithmic temperature dependence has a positive slope κ≈0.75, indicating the dominance of electron-electron interaction over the weak anti-localization effect, with an apparently negative Coulomb screening factor F that demands future work for clarification.     

过渡族元素对非晶态Nd15Fe79B6合金磁性的影响

本文讨论了用熔态急冷法制备的非晶态Nd₁₅Fe₇₉B₆合金中,掺杂Nb,V,Cr,Mn,Co,Ni和Cu等元素后,对磁矩、居里温度及晶化温度的影响。还用穆斯堡尔谱估计了掺杂后样品内场的变化,并作了合理的解释。 关键词：     

电磁搅拌对半固态A356-Y铝合金凝固组织的影响

在A356铝合金中添加少量Y作为合金的细化剂,同时结合自制变频控制的电磁搅拌设备对合金进行短时弱电磁搅拌。分析了电磁频率对A356-Y合金初生α相形貌和尺寸的影响;并利用背散射电子像,探讨了不同电磁频率对半固态A356-Y合金铸锭径向上稀土元素分布的影响。研究表明:液态A356-Y合金经620℃低过热度浇铸,并在频率为30 Hz的条件下搅拌15 s,于590℃保温5 min后,其初生α相的形貌和尺寸达到最佳,其中心部区域晶粒平均等积圆直径为64.95μm,平均形状因子为0.80;边缘区域晶粒的平均等积圆直径为58.97μm,平均形状因子达到0.83。铸锭径向上的区域不均匀性和稀土元素呈靠近模壁含量越高的分布规律,与电流频率、化合物密度、受力等因素相关。     

二维材料双电层场晶体管的研究

近年来, 二维材料特别是二维过渡金属硫属化合物材料作为一个新兴研究领域引起了人们极大的兴趣, 它们也被认为是基于石墨烯电子器件的补充材料. 过渡金属硫属化合物之所以能引起人们强烈的兴趣, 在于它们奇特的性质以及其在催化, 能量存贮, 电子, 光电等领域的广泛应用. 自2007年开始, 双电层离子液体晶体管技术被广泛的应用于有机和无机材料包括过渡金属硫属化合物材料以修饰或者调控这类材料的电性质. 基于这种双电层晶体管技术, 材料的迁移率, 操作电压等被进一步改善, 绝缘-金属相变, 超导甚至是铁磁性质也被实现. 本工作将综述双电层离子液体晶体管技术对二维材料的调控性能和简要展望其今后的发展方向.     

The co-phasing detection method for sparse optical synthetic aperture systems

Co-phasing between different sub-apertures is important for sparse optical synthetic aperture telescope systems to achieve high-resolution imaging.For co-phasing detection in such a system,a new aspect of the system’s far-field interferometry is analysed and used to construct a novel method to detect piston errors.An optical setup is built to demonstrate the efficacy of this method.Experimental results show that the relative differences between measurements by this method and the criterion are less than 4%,and their residual detecting errors are about 0.01 λ for different piston errors,which makes the use of co-phasing detection within such a system promising.     

GJB151B CS115的电路仿真分析（二）——标准应用分析

为解决GJB151B CS115电缆束注入脉冲传导敏感度测试项目中的试验设计、效果预估等问题,在介绍不同类型受试线缆感性脉冲电流注入电路模型的基础上,仿真分析了试验设置中的各项因素（线缆设置、末端负载等）对注入到受试设备端口耦合电流/电压的影响,得到了CS115试验设置中存在的一些规律性特征,给出了应用电路仿真开展CS115试验设置分析和优化的方法。