四苯基卟啉锌-单壁碳纳米管复合薄膜的制备与光电特性研究

使用喷涂法制备了四苯基卟啉锌(ZnTPP)薄膜及ZnTPP-单壁碳纳米管复合薄膜。采用金相显微镜、扫描电子显微镜、台阶仪、四探针测试仪、紫外-可见光分光光度计、傅里叶红外光谱仪对薄膜的形貌、电学及光学性能等进行了系统的测量,研究了ZnTPP薄膜及ZnTPP-碳纳米管复合薄膜的太赫兹响应特性。结果表明,ZnTPP的太赫兹指纹谱峰为44,57,77,88,95和102 cm-1,与文献[3]报道的棕树叶中叶绿素的指纹谱峰基本一致。重要的是,通过与碳纳米管相复合的方法,不仅使ZnTPP有机薄膜的均匀性及致密性得到了改善,还使后者的导电性及在紫外到太赫兹波段的光吸收性能获得明显增强。此外,还发现了复合薄膜在47及66 cm-1处出现新的太赫兹吸收峰,证明了碳纳米管和ZnTPP之间存在的相互作用。这种作用使复合薄膜的综合性能得到提高。结果表明,通过加入碳纳米管,能够对ZnTPP的薄膜质量以及电学和光学性能等进行有效的改善,使之具有综合优良的物理性能、具备光电器件的应用前景。研究成果对促进有机物的太赫兹光谱研究以及寻找新型太赫兹有机敏感材料等具有重要意义。     

基于AMESim的制动钳动态所需液量检测仿真研究

制动钳所需液量检测是制动钳性能检测中十分重要的一部分,目前关于制动钳动态所需液量检测研究缺乏理论和仿真依据,无法结合实际检测实现制动钳故障诊断,针对这一问题,在研究主缸位移差值法动态所需液量检测系统数学模型的基础上搭建AMEsim仿真模型,对主缸活塞速度和钳体结构因素进行仿真分析,并通过实验验证模型的正确性。结果表明：主缸活塞速度对动态所需液量检测影响较小;回位弹簧刚度、制动间隙和摩擦块、橡胶密封圈硬度对动态所需液量曲线有不同程度的影响,可以根据曲线特征实现制动钳故障诊断。     

Cu、N空位对Cu_3N的电子结构、电学和光学性能影响的第一性原理研究

本文采用基于密度泛函理论的第一性原理计算方法,研究了立方相Cu_3N晶体中含Cu、N空位体系的稳定性、电学、光学性能.研究结果表明含Cu空位和N空位体系的结构比较稳定,Cu空位和N空位降低了体系的导电性,但增加了体系的透射率;含Cu空位和N空位体系的禁带宽度均大于Cu_3N体系,说明实验中制备的Cu_3N有时表现为绝缘体的可能原因为体系中存在Cu空位或N空位.     

从实验原理出发 攻破2 0 1 6年高考 全国卷 Ⅰ 物理电学实验题

20 1 6年高考全国卷 Ⅰ 物理电学实验题实验情境较新颖, 考生需要根据已有知识和题目条件正确理解 实验原理, 才能对该题迎刃而解. 从详细解读该题的实验原理出发, 阐述如何攻破该题并提出相应的教学建议     

一种高精度电容性微小变化量液压变送器

为测定流体压强的微小变化,提出一种基于平行板电容器原理的微小液压变送器设计方案,直接将压强变化量转换成频率信号变化量。该方案将平行板电容器作为传感器与温度传感器一并封装于管体内,同时电容器作为信号变送器的一部分实现电容-频率转换,变送器管体设有透明观察窗口用以直接感知液位的变化。实验结果表明,可实现静态压强和动态压强的高精度测量,测量精度达0.26Pa/Hz,具有装置简单、易操作、重复性好等特点。     

Study of the Lie symmetries of a relativistic variable mass system

The differential equations of motion of a relativistic variable mass system are given.By using the invariance of the differential equations under the infinitesimal transformations of groups,the determining equations and the restriction equations of the Lie symmetries of a relativistic variable mass system are built,and the structure equation and the conserved quantity of the Lie symmetries are obtained.Then the inverse problem of the Lie symmetries is studied.The corresponding Lie symmetries are found according to a known conserved quantity.An example is given to illustrate the application of the result.     

Existence and linear stability of planar waves in the Oregonator model

In this paper,various waves in the Oregonator model are investigated in detail.The existence of planar waves(in particular,spiral waves)is rigorously proven and their linear stability is analysed.In addition,some non-planar waves in the model are also presented.     

The Geometric Construction of WZW Effective Action in Noncommutative Manifold

By constructing close-one-cochain density Ω^12n in the gauge group space we get the Wess-Zumino-Witten (WZW) effective Lagrangian on high-dimensional noncommutative space.Especially consistent anomalies derived from this WZW effective action in noncommutative four-dimensional space coincide with those obtained by L.Bonora etc.(het-th/0002210).     

规范场静态解的稳定性

对有规范条件或约束的非线性理论,研究了其驻点的Hessian形式.指出了规范场的经典解的稳定性由包含拉格朗日乘子贡献的有效拉氏量的二阶变分决定.     

中子注量率波动修正因子及其应用

在中子核反应研究中,尤其是在利用活化法进行中子核反应截面测量研究时,需要准确测量样品辐照的中子注量。监督反应标准截面法简便可行,在一些核反应截面测量研究中经常用来定量样品辐照的中子注量。在利用监督片核反应剩余核的放射性活度计算平均中子注量率时,中子注量率波动修正因子是一个很重要的参数。对中子注量率波动修正因子进行了详细阐述,通过理论推导给出了中子注量率波动修正因子的定义,从实际应用出发讨论了中子注量率波动修正因子的使用条件和监督反应的选择原则。Incident neutron flux has to be measured accurately in the neutron reaction study especially in the neutron reaction cross-section measurement with activation method. Average neutron flux in the irradiated sample is usually determined by the monitor reaction with reference cross-section values. However, the average incident neutron flux, based on the radioactivity of the residual nuclei produced in the monitor reaction, is dependent upon the neutron flux fluctuation. In the procedure of the average neutron flux calculation, the correction factor for the neutron flux fluctuation plays a key role. In this paper, definition of the neutron flux fluctuation correction factor is inferred heoretically. The selection principles of the monitor reaction and the utilization of the correction factor have been discussed.