Large third-order nonlinear optical properties of C70 fullerene in the infrared regime

The nonlinear third-order optical susceptibility of C₇₀ in a toluene solution is measured for the first time by the method of degenerate four-wave mixing using 10 ns laser pulses at 1.06 m. The third-order susceptibility X _in ⁽³⁾ is 5.6×10^–12 esu for a C₇₀ toluene solution at a concentration of 0.476 g/l. The correspondent magnitude of the hyperpolarizability ₁₁₁₁ of the C₇₀ molecule is 1.2×10^–30 esu which is in a good agreement with the prediction given by the model of a free electron in a spherical box.     

Efficient evaluation of the [Z] matrix with method of moment in grounding analysis by using adaptive spatial sampling approach

The design of grounding system often relies on the performance simulations. The evaluation of the current distribution of grounding system for many frequencies by using the method of moments (MoM) may take a long time since the impedance matrix must be recomputed at each new frequency. A multiobject adaptive spatial sampling approach is presented to construct the fitted model of the electric field intensity generated by a horizontal electric dipole. The [Z] matrix spatial interpolation technology with MoM is described to reduce the computational time needed for the transient characteristics analysis of a horizontal grounding system. The accuracy and computational time of the [Z] matrix interpolation method are compared with those of the direct MoM. The numerical examples show that the [Z] matrix spatial interpolation method can reduce the computation requirement effectively.     

基于DSP技术的RFID读写器设计

文中介绍了RFID系统及RFID读写器,论述了基于DSP技术的RFID读写器设计方法.在描述RFID系统组成的基础上,给出了读写器的软硬件设计流程.重点阐述了RFID读写器的防冲突设计.该读写器已应用于门禁系统中,实际应用结果表明其性能良好.     

Domain Adaptation with Data Uncertainty Measure Based on Evidence Theory

Domain adaptation aims to learn a classifier for a target domain task by using related labeled data from the source domain. Because source domain data and target domain task may be mismatched, there is an uncertainty of source domain data with respect to the target domain task. Ignoring the uncertainty may lead to models with unreliable and suboptimal classification results for the target domain task. However, most previous works focus on reducing the gap in data distribution between the source and target domains. They do not consider the uncertainty of source domain data about the target domain task and cannot apply the uncertainty to learn an adaptive classifier. Aimed at this problem, we revisit the domain adaptation from source domain data uncertainty based on evidence theory and thereby devise an adaptive classifier with the uncertainty measure. Based on evidence theory, we first design an evidence net to estimate the uncertainty of source domain data about the target domain task. Second, we design a general loss function with the uncertainty measure for the adaptive classifier and extend the loss function to support vector machine. Finally, numerical experiments on simulation datasets and real-world applications are given to comprehensively demonstrate the effectiveness of the adaptive classifier with the uncertainty measure.     

正常人周围神经冷冻复型超微结构观察

本研究利用冷冻复型电镜技术对５例正常人周围神经进行了观察：（１）有髓神经纤维髓鞘以同心圆形式包裹轴索，后者位于中央呈圆柱样。（２）雪旺细胞核膜劈裂面不论ＰＦ面还是ＥＦ面膜蛋白颗粒（ＩＭＰ）均较丰富，核孔数量较多，说明该细胞代谢功能较旺盛；另外其胞膜表面ＩＭＰ呈簇状分布，推断在正常情况下该区域物质代谢较活跃或雪旺细胞具有分泌功能；再者，髓鞘板层与一般生物膜不同，其劈裂面不论是ＰＦ面还是ＥＦ面均罕见ＩＭＰ，推测此为神经冲动呈跳跃式传导和绝缘性传导的物质基础。（３）轴索内亚细胞结构可见微丝、微管，二者除具有支架作用外，还参与轴浆物质运转等许多重要的神经生理活动。（４）沿神经纤维纵向劈裂面可见相邻雪旺细胞膜内陷相贴，形成轴索外系膜。     

光动力法制备抗小鼠H22肝癌的肿瘤疫苗

研究了光动力疗法(PDT)制备的抗小鼠H22肝癌肿瘤疫苗的抗瘤效应.将昆明鼠60只,随机分为2组,每组30只.实验组取6~12周龄的昆明鼠背部皮下接种光动力疗法产生的疫苗,每3天注射一次,每次注射50μL(相当于3×105个细胞),连续两周.隔一周于第22天注射H22肿瘤细胞悬液0.1 mL(1×106个细胞);对照组:每周每次注射50μL生理盐水,连续两周.隔一周于第22天注射H22肿瘤细胞悬液0.1 mL(1×106个细胞).比较两组的抑瘤率、生存率以及两组之间免疫学的相关指标.结果表明,实验组小鼠具有显著的抑瘤效果,抑瘤率、生存率较对照组有显著提高.实验组肿瘤抑瘤率最高可达60%且长期有效,100天生存率达56%.说明光动力疗法产生的抗小鼠H22肝癌疫苗可以有效地抑制肿瘤生长,提高荷瘤小鼠的生存率,具有明显的抗瘤效应.该方法可能成为一种辅助性治疗肿瘤的手段而应用于临床.     

a—Si：H TFT电流—电压特性研究

本文发展了一种研究ａ－Ｓｉ：Ｈ ＴＦＴ电流－电压特性的新方法。基于局域态电荷密度解析统一模型，提出并深入分析了沟道区有效温度参数的概念，并由此推导出了ａ－Ｓｉ：Ｈ ＴＦＴ电流－电压特性的解析表达式。其理论值与实验值符合很好。该模型可用于ａ－Ｓｉ：Ｈ ＴＦＴ静态特性分析及其电路优化。     

体硅热膜传感器单片集成工艺的研究

针对MEMS热膜式传感器的发展趋势和在实用化过程中存在的问题,提出了一种新型的单片电路和体硅MEMS热膜式传感器实现集成制造的嵌入式CMOS工艺技术,解决了MEMS制造工艺和CMOS集成电路工艺之间存在的兼容性问题。通过这种嵌入式CMOS工艺技术,可以实现具备最小体积、最低成本的MEMS器件。通过这种嵌入式热膜式传感器和CMOS处理电路的单片集成制造工艺,实现了一款热膜式传感器和IC放大电路的集成部件,并完成了相关基本电性能测试和传感器功能的演示验证,证明了设计的工艺路线的可行性。