复合材料Terfenol-D/PMNT的磁电和逆磁电响应

给出了Terfenol-D/PMN-PT/Terfenol-D(TD/PMNT/TD)和PMNT/TD/PMNT两种层状复合材料的磁电和逆磁电响应的测试方法和测试结果. 这两种复合结构的优化直流偏置磁场大小均为350 Oe(1 Oe=79.58 A/m). 在1 kHz频率下, 这两种复合材料的最大磁电电压系数分别为384 mV/Oe和158 mV/Oe, 最大逆磁电系数分别为118 mG/V和162 mG/V (1 G = 10^-4 T). 另外研究了这两种复合材料在谐振频率下的磁电响应. 通过对两种复合结构的比较得知, 磁致/压电/磁致复合结构具有好的磁电响应; 而压电/磁致/压电复合结构具有好的逆磁电响应. 这一结果有助于优化设计高性能压电/磁致复合磁电材料.     

指针式仪表自动识别装置的设计

针对指针式仪表人眼读数效率低,不能转化成数字信号输入计算机,提出一种基于Hough变换的指针式仪表自动判读方法.该方法运用图像减影技术,通过调节图像分辨率实现指针的检出,再利用Hough变换做峰值检测、线检测和链接,通过转换偏转角度的基线位置,确定出仪表指针的读数.实验表明,该方法能快速有效地完成指针式仪表的自动判读,且最大不确定度明显优于人眼的识别,具有较高的精度.     

SLAC1 is required for plant guard cell S-type anion channel function in stomatal signalling

Stomatal pores, formed by two surrounding guard cells in the epidermis of plant leaves, allow influx of atmospheric carbon dioxide in exchange for transpirational water loss. Stomata also restrict the entry of ozone--an important air pollutant that has an increasingly negative impact on crop yields, and thus global carbon fixation and climate change. The aperture of stomatal pores is regulated by the transport of osmotically active ions and metabolites across guard cell membranes. Despite the vital role of guard cells in controlling plant water loss, ozone sensitivity and CO2 supply, the genes encoding some of the main regulators of stomatal movements remain unknown. It has been proposed that guard cell anion channels function as important regulators of stomatal closure and are essential in mediating stomatal responses to physiological and stress stimuli. However, the genes encoding membrane proteins that mediate guard cell anion efflux have not yet been identified. Here we report the mapping and characterization of an ozone-sensitive Arabidopsis thaliana mutant, slac1. We show that SLAC1 (SLOW ANION CHANNEL-ASSOCIATED 1) is preferentially expressed in guard cells and encodes a distant homologue of fungal and bacterial dicarboxylate/malic acid transport proteins. The plasma membrane protein SLAC1 is essential for stomatal closure in response to CO2, abscisic acid, ozone, light/dark transitions, humidity change, calcium ions, hydrogen peroxide and nitric oxide. Mutations in SLAC1 impair slow (S-type) anion channel currents that are activated by cytosolic Ca2+ and abscisic acid, but do not affect rapid (R-type) anion channel currents or Ca2+ channel function. A low homology of SLAC1 to bacterial and fungal organic acid transport proteins, and the permeability of S-type anion channels to malate suggest a vital role for SLAC1 in the function of S-type anion channels.     

监测奶牛无线传感器网络的连通支配集构造

基于一个对奶牛行为特征监测的自组织无线传感器网络,构造骨干网以解决节点多跳通信问题,并采用图的连通支配集来实现。提出了一个基于极大独立集的最小连通支配集的分布式构造算法,并证明了该算法的正确性。采用计算机程序仿真的实验结果表明,此算法简单有效、适应于节点移动和网络拓扑变化的环境、且构造的连通支配集占节点的比例为30%左右,有效减少冗余的转发节点,可节省宝贵的网络资源。     

Edaphic factors determining variation of two ecotypes of Leymus chinensis in North China

Leymus chinensis(Trin.) Tzvel .is a type ofperennial ,rhizome grass with biological andecologicalproperties of resisting drought , poor-nutrient andsalt-alkaline stress .L. chiensiscan adapt to manycomplicated habitats due toits highecological plastici-ty.L. chinensisis always distributed as scatteredpatches with either grey-green or yellow-greenleaves. Steppe dominated by this species is widelydistributed at the eastern end of the Eurasian steppezone. Its main locations in China are the Son…     

集成Intserv Diffserv 和MPLS改善IP QoS

讨论了 Intserv,Diffserv和 MPLS集成模型的功能及服务类型之间的映射。在边缘网络使用 RSVP,在核心网络使用 CR- LDP作信令协议进行资源预留或建立交换路径 ,对核心网络中的标记边缘路由器 LER和标记交换路由器 LSR的结构和功能进行了设计和说明     

马来眼子菜抑制藻类增长及其抑制系数的计算

不同处理的马来眼子菜种植术培养藻类所得的结果证明抑藻物质及其效应的存在，并且各处理的藻类最大数量与马来眼子菜生物量及其种植时间有显著的负的幂函数关系．按照Ｌｏｔｋａ－Ｖｏｌｔｅｒｒａ模型求得水草对藻类的抑制系数ａ．去根水草与留根水草的试验有相似的结果．     

服从FGM Copula的实值重尾随机游动的局部Max-Sum等价

该文考虑了服从FGM copula的实值重尾随机游动.在边缘分布满足一定条件下,利用局部重尾分布理论和FGM copula的有关性质研究了部分和的尾分布局部渐近性质,进而将在该相依结构下重尾随机游动的局部Max-Sum等价成立的范围由正实数推广到全体实数情形.该结果在风险理论中具有一定的应用价值.     

Both thermal and nociceptive afferents influence the unit activity of the neurons in the corpus striatum

Summary Both thermal and nociceptive stimulation in the periphery were shown to influence the neuronal activity recorded in the striatal area. Both the thermal and nociceptive sensitivity of the striatal neurons were closely related.The authors are grateful to the Alexander von Humboldt-Stiftung (Bad Godesberg, Bonn, Federal Republic of Germany) for donations of the necessary equipment for the present study. The research reported here was supported by grants from the National Science Council (Taipei, Taiwan, Republic of China)