HL-1装置边缘区的电探针测量

用一个可移动的静电双探针获得了HL-1装置边缘区电子温度T_e,电子密度n_e的时空分布。实验测得孔栏边缘处T_e和n_e。分别约为12eV和3×10~(11)cm~(-3),n_e沿小半径方向的径向梯度约4.7X 10~(11)cm~(-3);在等离子体边缘区,n_e,T_e的e倍衰减特性长度分别约为20mm和27mm,在删削区内,λ_n,λ_T急剧减小。粒子的横向扩散系数与玻姆系数同量级。     

Construction of inclusions with vanishing generalized polarization tensors by imperfect interfaces

We investigate the problem of planar conductivity inclusion with imperfect interface conditions. We assume that the inclusion is simply connected. The presence of the inclusion causes a perturbation in the incident background field. This perturbation admits a multipole expansion of which coefficients we call as the generalized polarization tensors (GPTs), extending the previous terminology for inclusions with perfect interfaces. We derive explicit matrix expressions for the GPTs in terms of the incident field, material parameters, and geometry of the inclusion. As an application, we construct GPT-vanishing structures of general shape that result in negligible perturbations for all uniform incident fields. The structure consists of a simply connected core with an imperfect interface. We provide numerical examples of GPT-vanishing structures obtained by our proposed scheme.     

磁过滤器电流对非晶碳薄膜摩擦学特性影响的研究

研究了过滤阴极真空电弧技术中,不同的磁过滤器电流下(5—13 A),制备的四面体非晶碳(ta-C)薄膜对摩擦学特性的影响.通过对薄膜厚度,薄膜结构以及薄膜表面粗糙度随磁过滤电流的变化结果进行了测试,结果表明,随着磁过滤器电流的增大,薄膜的sp³键含量逐渐减少,表面粗糙度从0.13增大到0.38.磁过滤器电流在5 A时,薄膜的摩擦系数最小约为0.08,当电流增大到7 A时,摩擦系数显著增大,磁过滤器电流从7 A增大到13 A时,薄膜的摩擦系数再次减小约为0.1. 关键词： 四面体非晶碳 过滤阴极真空电弧 磁过滤器电流 摩擦系数     

关于一个核含参数且-2齐次的Hilbert型不等式

通过估算权系数,建立一个核含2-参数且-2齐次的Hilbert型不等式及其等价式,并考虑了逆向不等式的情形．     

光学材料热光系数的精确测量——“热光系数仪”

本文介绍用于光学材料系数精确测量的“热光系数仪”。该仪器采用两种干涉仪组合、微机控制和数据采集处理等设计方案,实现了高精度测量。低温区热膨胀系数α、折射率温度系数β热光系数W的测量精度可达±3×10~(-7)°C~(-1)。     

调和映射在线性非平衡热力学中的应用

本文将一类线性非平衡热力学系统归结为调和映射问题.文中将昂塞格系数从常数推广成状态变量的函数,并应用调和映射讨论了系统的定态及其稳定性问题,给出了判定系统定态稳定性的判据.最后讨论了这些结果与原有的最小熵产生定理间的关系.     

Performance optimization analysis of a thermoelectric refrigerator with two resonances

Based on electron transport theory,the performance of k x and k r filtered thermoelectric refrigerators with two resonances are studied in this paper.The performance characteristic curves between the cooling rate and the coefficient of performance are plotted by numerical calculation.It is shown that the maximum cooling rate of the thermoelectric refrigerator with two resonances increases but the maximum coefficient of performance decreases compared with those with one resonance.No matter which resonance mechanism is used(k x or k r filtered),the cooling rate and the performance coefficient of the k r filtered refrigerator are much better than those of the k x filtered one.     

腔内倾斜扰动对正支共焦腔本征模式的影响

针对激光器出光过程中腔内像差扰动带来的光束质量下降问题,分析了正支共焦腔腔内不同位置倾斜扰动对本征模式的影响,采用数值迭代法计算了理想状态及腔内不同位置倾斜扰动状态下的本征模式、相位Zernike像差拟合系数.结果表明：对大小给定的扰动,相位相对敏感性从凸面镜到凹面镜逐渐增加,且腔模倾斜像差增大的同时还将导致离焦、像散等高阶像差的增大,因此作腔内补偿时,应使补偿平面尽可能靠近凹面镜.     

双涂层光纤应变传感器的理论与实验研究

对带有聚合物涂敷层和缓冲层的光纤应变传感器的力学特性进行了研究,建立了双涂层光纤与基体材料相互作用的线弹性理论模型.理论研究表明：在小半径近似条件下,双涂层光纤的力学传递特性决定于涂覆层和缓冲层的弹性模量的相对值;当缓冲层的弹性模量远大于涂覆层时,其作用可忽略.实验中,将光纤传感器埋入基体材料内部,利用白光干涉应变测量方法,对平均应变传递系数进行了实验研究.实验结果与理论仿真具有较好的一致性.     

Photoassociation spectra of ultracold ~(85)Rb_2 molecule in 0_u~+ long range state near the 5S_(1/2)+ 5P_(1/2) asymptote

We investigate the high resolution photoassociation spectra of ~(85)Rb_2 molecules in 0~+_u long range state below the(5S_(1/2)+ 5P_(1/2)) asymptote. The ~(85)Rb atomic samples are trapped in a dark magneto–optical trap(MOT) and prepared in the dark state. With the help of trap loss technique, we obtain considerable photoassociation spectroscopy with rovibrational resolution, some of which have never been observed before. The observed spectrum is fitted by a rigid rotation model, and the rotational constants of ultracold ~(85)Rb_2 molecule in long range 0~+_u are obtained for different vibrational states. By applying the Le Roy–Bernstein method, we assign the vibrational quantum numbers and derive C_3 coefficient, which is used to obtain the potential energy curve.