Responses of Teretrius nigrescens Toward the Dust and Frass of Its Prey, Prostephanus truncatus

Teretrius nigrescens is considered to be a specialized predator of Prostephanus truncatus, a serious pest of stored maize and dried cassava roots. Using a bait-bag behavioral bioassay, this investigation found T nigrescens to be strongly arrested by dust and frass produced by P. truncatus on maize, whereas responses to maize flour were weak. Attempts to increase the arrestiveness of flour by altering its physical properties (coarseness or particle size range) were unsuccessful. The arrestive property of dust/frass did not degrade with long-term storage nor did it volatilize or degrade with oven baking up to 150 degrees C. However, extraction with methanol and reapplication was successful in transferring the arrestive property from the dust/frass onto maize flour. The prey dust/frass also induced more oviposition than did maize flour, as judged by production of F1 offspring. The results provide strong evidence for the existence of a high boiling point compound(s) in P. truncatus dust/frass that acts as a contact kairomone for T nigrescens. This, or another compound(s) also seems to act as an oviposition stimulant for female T. nigrescens.     

基于力控监控组态软件的动车段安全联锁系统

<正>1概述随着高速列车和城市轻轨线路的飞速发展,车辆段的检修工作日益复杂、繁忙。为防止工伤事件或设备严重损失,基于铁路行业联锁控制的概念的安全联锁系统应运而生。通常情况下,安全联锁系统由保证平台登顶作业人员人身安全的门禁子系统、车辆出入库信号和警     

一种基于虚拟化技术的异构网格互操作机制研究与实现

针对目前网格系统在实现机制、技术支持上异构性大,缺乏互操作,提出一种基于虚拟化技术的异构网格互操作机制(Virtualization-based Grid Interoperation,VIGI).VIGI通过构建虚拟管理层和插件模块,实现异构网格互操作,同时保证各网格平台的独立性.GOS、CGSP是中国国家网格(CNGrid)和中国教育科研网格(ChinaGrid)两大异构网格支撑中间件.基于VIGI,实现了CNGrid和ChinaGrid互操作.实验验证虚拟化技术在异构网格互操作中的可行性和有效性.     

基于稀疏度自适应的视觉图像三维清晰重构

针对当前方法重构视觉图像时,存在峰值信噪比低、重构时间长和图像分辨率低的问题,提出基于稀疏度自适应的视觉图像三维清晰重构方法,利用图像光度信息和几何信息划分图像,按照纹理类别和边缘类别对图像进行分类,在图像组类别和噪声水平的基础上训练自适应字典,根据字典获得图像非局部相似先验和稀疏表示,结合建立变分模型对图像进行去噪处理.对去噪后的图像进行奇异值分解字典训练,利用稀疏度自适应正则化正交匹配算法对分解后的图像重建,完成视觉图像的三维清晰重构.仿真结果表明,所提方法的峰值信噪比高、重构时间短、图像分辨率高.     

S型MEMS平面微弹簧的制备和表征研究

微弹簧是一种重要的微电子机械系统(MEMS)器件，它可以为微传感器和微执行器提供弹性驱动力。我们采用UVLIGA技术制备出S型镍平面微弹簧，并使用ANSYS对微弹簧的力学性能进行了模拟。为测试微弹簧的力学性能，研制了1台微弹簧力学性能测试装备。测试结果表明，微弹簧可以满足设计需要。另外，通过比较得出：ANSYS对微弹簧力学性能的模拟结果是较为准确的，可以作为进一步优化微弹簧设计的基础，以满足MEMS的需要。     

汽车覆盖件模具结构的模板化设计

引进模板化、积木式设计思想，在UG平台的基础上开发了覆盖件模具结构设计cAD系统的模板库，并建立了包含标准件和标准结构的素材库，实现了模具结构的模板化设计。通过对某车型机罩外板拉延模结构设计的实际应用，证明模板化技术可简化设计过程．提高设计效率，加强模具设计的标准化程度。     

Histamine in the brain of insects: a review

Histamine is the neurotransmitter of photoreceptors in insects and other arthropods. As a photoreceptor transmitter, histamine acts on ligand-gated chloride channels. Another type of histamine receptor has been indicated in the insect central nervous system by binding pharmacology. This receptor is similar to the mammalian H1 receptors, which are G-protein coupled and thus utilize a second messenger system. The distribution of histamine-immunoreactive (HAIR) neurons has been studied in a few insect species: cockroaches, locust, crickets, honey bee, blowflies, and in Drosophila. In addition to its presence in photoreceptor cells, histamine is distributed in a rather small number of neurons in the insect brain. Many of these neurons have extensive bilateral arborizations that innervate several distinct neuropil regions, notably in the protocerebrum. Some patterns of histamine distribution are seen in all the species. On the other hand, the number and morphology of neurons differ between the studied species, and several major neuropils (central body, antennal lobes, mushroom bodies) are supplied by HAIR neurons in some species, but not in others. Thus it appears that there are some species-specific functions of histamine and on others that are preserved between species. Some of the histaminergic neurons may constitute wide field inhibitory systems with functions distinct from those of neurons containing gamma-amino butyric acid (GABA). Novel data are presented for Drosophila and the cockroach Leucophaea maderae and a comparison is made with published data on other insects.     

基于ANSYS的运行环境下风力机气动载荷分析与研究

在运行环境下叶片所承受的气动载荷是在空气的气动压力与自身旋转产生的附加力的合作用。在不同的环境条件下,风力机叶片上的空气动力负载将会出现较大的差异。基于ANSYS分析软件,模拟运行环境下叶片上各叶素位置所承受的气动压力,分析叶片在正常运行、切出风速和极端风速的情况下载荷的压力分布,求解叶片材料的载荷应力极限,优化叶片结构及制造材料,降低叶片的生产成本,提高风力机叶片运行的可靠性。     

基于ANSYS的风力机叶片疲劳可靠性设计

风力机叶片在风力机运行过程中起着至关重要的作用,而风力机叶片的疲劳破坏是其主要的失效形式。因此,在风力机叶片设计中,要保证叶片有足够的疲劳强度以确保其工作寿命。通过对风力机叶片的静力学分析,确定最大应力点的位置,即整个叶片上最危险的位置,并结合ANSYS后处理模块中的疲劳分析功能,分析并计算了风力机叶片的疲劳可靠性。     

直齿锥齿轮一刀加工法

直齿锥齿轮可在锥齿轮刨齿机（如Y236型）上采用展成法加工，其切齿过程为工件与产形齿轮啮合的过程。但在中小企业往往没有刨齿机，当加工的锥齿轮精度要求又很低时，通常采用成形盘铣刀进行加工，在加工过程中需铣三刀才能完成，效率很低，又极易出现齿形不对称中心的弊端。为此，本文提出加工变位系数为零的锥齿轮只需一次走刀即可铣成的方法。这种加工方法是采用减小切削角贝，加深大、小端齿深，即改变齿根高和根锥角的方法，使大、小端分度回上齿厚能大致符合要求。用成形盘铣刀一次把直齿锥齿轮加工成形，尽管加工后的齿轮精度不高…