共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
5.
表面波的非接触式产生与接收 总被引:1,自引:0,他引:1
给出一种表面波非接触式产生与接收新方法。理论上分析了利用脉冲激光照射试件表面产生表面波的机理;给出了共焦Fabry-Perot干涉仪超声探测系统及其工作原理;利用红宝石脉冲激光器产生表面波,共焦Fabry-Perot干涉仪超声探测系统接收表面波,实现了表面波的非接触式产生与记录,同时,将该技术成功地用于表面微小开口缺陷的非接触检测。结果表明,该方法对于表面缺陷的检测是行之有效的。 相似文献
6.
The mechanism of the sense of smell has long been a subject for theory and speculation. More recently, the notion of odorant recognition by stereospecific protein receptors has gained wide acceptance, but the receptor molecules remained elusive. The recognition molecules are believed to be quite diverse, which would partly explain the unusual difficulties encountered in their isolation by conventional ligand-binding techniques. An alternative approach would be to probe the receptors through transductory components that may be common to all receptor types. Here we report the identification of one such transductory molecular component. This is an odorant-sensitive adenylate cyclase, present in very large concentrations in isolated dendritic membranes of olfactory sensory neurones. Odorant activation of the enzyme is ligand and tissue specific, and occurs only in the presence of GTP, suggesting the involvement of receptor(s) coupled to a guanine nucleotide binding protein (G-protein). The olfactory G-protein is independently identified by labelling with bacterial toxins, and found to be similar to stimulatory G-proteins in other systems. Our results suggest a role for cyclic nucleotides in olfactory transduction, and point to a molecular analogy between olfaction and visual, hormone and neurotransmitter reception. Most importantly, the present findings reveal new ways to identify and isolate olfactory receptor proteins. 相似文献
7.
Enzyme systems. Better reception for urokinase 总被引:1,自引:0,他引:1
W F Mangel 《Nature》1990,344(6266):488-489
8.
9.
Olfaction. Good reception in fruitfly antennae 总被引:1,自引:0,他引:1
10.
11.
给出了一种利用TD-SCDMA智能天线实现分集接收的方法,与空分多址方式相比,可使设备性价比上升。还导出了一种计算CDMA系统容量的新方法,可用于证明TD-SCDMA基站分集接收设备也能达到空分多址接收设备的性能要求。 相似文献
12.
考虑到渤海水域脆弱的环境以及天津港的可持续发展,对天津港废物接收设施现状进行了科学系统地分析,指出其存在的缺点和不足,提出提高现有接收设施效率的意见和建议. 相似文献
13.
针对LTE系统的下行非连续接收(DRX)机制,提出了一种基于业务时延要求的动态非连续接收周期配置算法.首先网络侧按照正常的非连续接收机制对终端侧进行节能配置,然后利用实时的时延大小对非连续接收周期进行动态控制.数值分析表明,业务时延与网络负载有密切的关系,用户DRX周期配置需要与网络当前负载相结合;仿真结果表明,基于时延的动态周期调整机制,能够即时的适应网络状况以及自身需求的变化,与固定非连续接收周期相比,在用户满意度以及节能性上都有更好的表现. 相似文献
14.
孔子与苏格拉底是东西方所尊崇的智慧象征和人格典范,他们不仅是语言大师,同时也是修辞大师。二者在相同时代不同语境里所传递的话语信息均为精湛的修辞表达,但其终极修辞接受结果却大相径庭。从接受修辞学的学科视域着眼,其原因在于这两种修辞活动在接受渠道、接受者、接受语境、接受效果这四方面存在诸多异同点。 相似文献
15.
基于国际公约和相关规定要求,将压载水岸上接收设施与船上处理设备的应用特点进行比较,探讨压载水岸上接收处理的可行性. 相似文献
16.
17.
18.
19.
20.
毫米波为5G通信提供了更大的带宽,但其路径损耗和穿透损耗较大的缺点需要使用波束赋形技术来克服.传统的非连续接收(discontinues reception,DRX)机制由于在用于波束赋形系统中时会导致频繁的波束失准,从而影响通信质量,已不能满足系统要求.针对这一问题,提出了一种长睡眠周期可调整的有向DRX(adjus... 相似文献