玻碳电极表面复合配位银电结晶机理研究

以具有实际应用价值的复合配位体系无氰镀银电解液为研究对象, 运用循环伏安和电位阶跃等实验方法, 结合 Scharifker-Hill 经典理论模型分析, 成功获得了Ag在玻碳电极（GCE）表面电沉积的成核机理及成核动力学参数, 并分析了温度对成核方式及成核动力学参数的影响. 结果表明, 该体系下Ag在GCE表面的电沉积是由扩散控制的不可逆过程, 遵循三维瞬时成核生长机理. 随着阶跃电位从-750 mV 负移至-825 mV, 峰值还原电流Im逐渐增大, 达到峰值还原电流所需时间tm逐渐缩短; 扩散系数D变化不大, 基本稳定在（7.61±0.34）×10^-5 cm²·s^-1; 成核密度数N₀则从3.26 ×10⁵ cm^-2提高至10.2×10⁵ cm^-2. 银沉积初期的形貌观察, 验证了其三维瞬时成核生长机理. 提高温度可以显著改善电解液中具备活性的银配位离子的扩散能力, 缩短成核时间, 提升成核密度数N0.     

The robustness of sparse network under limited attack capacity

The paper studies the robustness of the network in terms of the network structure. We define a strongly dominated relation between nodes and then we use the relation to merge the network. Based on that, we design a dominated clustering algorithm aiming at finding the critical nodes in the network. Furthermore, this merging process is lossless which means the original structure of the network is kept. In order to realize the visulization of the network, we also apply the lossy consolidation to the network based on detection of the community structures. Simulation results show that compared with six existed centrality algorithms, our algorithm performs better when the attack capacity is limited. The simulations also illustrate our algorithm does better in assortative scale-free networks.     

块石形状对土石混合体力学行为影响的颗粒流模拟

考虑块石形状为球体、正方体和长方体三种情况,通过正方体与球体相比较来探究块石棱角度不同对土石混合体力学特性的影响,通过长方体与正方体相比较来探究块石球度不同对土石混合体力学特性的影响。首先,提出特定形状块石三维离散元精细建模的方法;接着建立含石量为30%和80%的块石形状分别为球体、正方体和长方体的土石混合体三维颗粒流数值模型;然后,对土石混合体大三轴试验进行颗粒流模拟,获得了不同含石量及不同块石形状的土石混合体试样的宏观力学特征;最后,详细分析了块石形状对土石混合体力学行为影响的细观机理。结果表明,块石形状会影响土石混合体的力学行为,其影响的程度与含石量密切相关;配位数、块石颗粒平均旋转量和摩擦功的演化规律能够很好地从细观水平上反映块石形状的作用机理。     

Performance of a double sided silicon strip detector as a transmission detector for heavy ions

The performance of a double sided silicon strip detector （DSSSD）, which is used for the position and energy detection of heavy ions, is reported. The analysis shows that although the incomplete charge collection （ICC） and charge sharing （CS） effects of the DSSSD give rise to a loss of energy resolution, the position information is recorded without ambiguity. Representations of ICC/CS events in the energy spectra are shown and their origins are confirmed by correlation analysis of the spectra from both the junction side and ohmic side of the DSSSD.     

Three-dimensional size and orientation of the precipitates in AZ91 magnesium alloys measured by TEM techniques

Knowledge of the microscopic structure, including three-dimensional (3-D) size and orientation of the precipitates, is essential to fully understand the mechanical properties of the magnesium alloys and designing the alloys with better performance. Analytical TEM with high spatial resolution offers the simultaneous measurements of 3-D size, structure, orientation, composition of the precipitates from one typical sample along an established crystallographic axis. Besides popular Burgers orientation relationship (OR), other ORs such as Pitsch--Schrader OR, Crawley OR, Potter OR and a new OR with the form of [0001]_α 1.0° from [311]_γ and (11\bar 20)_α 2.0° from (03\bar 3)_γ between the magnesium matrix and the precipitate γ -Mg₁₇Al₁₂ are identified by TEM imaging and diffraction techniques. As a case study, the thicknesses of the individual precipitates with Burgers OR are further measured to be 100--200~nm through both electron energy-loss spectroscopy and x-ray energy dispersive spectroscopy combining differential x-ray absorption and extrapolation, which are in agreement with the overall 3-D size statistic distribution results obtained through analysing various samples along various directions. Furthermore, the fabricated wedge-shape structure provides a platform on which to study the dependence of the interfacial strain on the variation of the thickness.     

Investigation of Random Response of Rotational Shell When Considering Geometric Nonlinear Behaviour

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｅｎｇｉｎｅｅｒｉｎｇ,ｔｈｅｎｏｎｌｉｎｅａｒｉｔｙｏｆｓｈｅｌｌｓｔｒｕｃｔｕｒｅｉｓｓｏｍｅｔｉｍｅｓｏｂｖｉｏｕｓ.Ｉｔｉｓｖｅｒｙｄｉｆｆｉｃｕｌｔｔｏｓｏｌｖｅｔｈｅｐｒｏｂｌｅｍｏｆｔｈｅｎｏｎｌｉｎｅａｒｒａｎｄｏｍｖｉｂｒａｔｉｏｎ .Ｉｎｔｈｉｓｐａｐｅｒ,ｗｅｔｒｙｔｏｓｏｌｖｅｉｔｉｎｔｈｅｆｒｅｑｕｅｎｃｙｄｏｍａｉｎｂｙａｎｉｍｐｒｏｖｅｄｓｔａｔｉｓｔｉｃｌｉｎｅａｒｉｚａｔｉｏｎｍｅｔｈｏｄ .Ｗｅｃｏｎｓｉｄｅｒｏｎｌｙｔｈｅｇｅｏｍｅｔｒ…     

掺杂TiO2的La2/3Ba1/3MnO3电输运与磁电阻特性

通过固相反应法制备了(1-x)La2/3Ba1/3MnO3 xTiO2(x=0％～5％)多晶陶瓷样品，实验发现，随着TiO2掺杂量的增加，电阻率明显增大，金属绝缘相转变温度Tp值下降．通过室温(300K)和低温(78K)下不同磁场的磁电阻计算表明，适量的TiO2掺杂会明显提高材料的磁电阻性能；在1T磁场下，TiO2掺杂量为1％的样品室温磁电阻达到12％，这是未掺杂La2/3Ba1/3MnO3相同条件下的3倍，为磁电阻传感器研究提供了实验依据。     

考虑旋转壳几何非线性时的随机响应研究

提出了一种统计线性化迭代法（IMSL）。利用这种方法,在形成非线性几何关系等效线性项的基础上,建立了非线性振动方程的等效刚度矩阵。通过求解方程,分析了几何非线性对旋转壳随机响应的影响。     

高密度互连印制电路板孔金属化研究和进展

孔金属化互连是印制电路板（PCB）高密度集成的核心制程之一,化学镀铜和电子电镀铜是实现孔金属化的关键技术。本文介绍HDI-PCB的概念和制作流程;综述化学镀铜和电子电镀铜孔金属化互连的研究和进展,包括溶液组成和操作条件的影响,添加剂及其相互作用机理,以及盲孔填充和通孔孔壁加厚机制;展望高密度互连印制电路板电子电镀基础研究及新技术发展方向。