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铁路列车由于经常进行解体和编组,部署有线网络难度大,维护困难。基于Mesh技术的无线网络部署方便,具有较高的可靠性和灵活性,工程量小,投资少。介绍先进的Mesh网络多跳技术、自适应无线路由技术及多射频混合复用技术等,提出为列车部署稳定可靠的无缝无线网络的思路和具体方案。 相似文献
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以C8051F单片机作为中央处理器,采集电参数计量模块和TAX2型机车安全综合监测装置的信息,生成并存储电量消耗记录;通过USB盘转储数据到地面进行处理和分析。系统整体设计具有模块化、准确可靠的特点,对电力机车节能降耗措施提供合理的依据。 相似文献
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文章着重介绍了HVAC风道保温工艺,分析了业主提出安装方式的优缺点,同时,确定了平台既适用又方便的施工方案。 相似文献
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通过汽车修理网点的优化设计,定出骨干企业,以便使这些的人才,物力,财力和国家,私营业主的投资得到最充分的利用,使修车费用和车辆送修往返运输费用的总数最小。 相似文献
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汽车要能操纵自如,必须具有优越的加速性和减速性,从安全的观点出发,尤应具有良好的制动性能.为了满足这一需要,现代汽车都装备有各种行车制动装置,有的汽车除传统的制动装置外,还装有感载比例阀、电子防抱死制动装置(ABS)等,使汽车的制动装置越来越现代化,其制动性能也越来越好. 相似文献
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Objective To investigate the properties of proliferation and differentiation of neonatal rat retinal progenitor cells (RPCs) in vitro. Methods RPCs were isolated from neonatal SD rats neural retina and cultured in DMEM/F12 + N2 with EGF and bFGF (suspension medium ) or 10 % FBS without EGF and bFGF ( differentiation medium). The cells grew as suspended spheres or adherent monolayers, depending on different culture conditions. The neural stem cells or retinal progenitors, neurons, astrocytes, retinal ganglion cells, rod photoreceptors and the proliferating cells were evaluated with immunofluorescence analysis by Nestin or Pax6, Map2, GFAP, Thy-1, Rhodopsin and BrdU antibodies respectively. Results RPCs could propagate and differentiate in suspension or differentiation medium and express the markers of Nestin (92.86%) or Pax6 (86.75%), Map2 (38.54%), GFAP (20.93%), Thy-1 (27. 66%) and Rhodopsin(13. 33%)in suspension medium; however, Nestin (60.27%), Pax6 (52%), Map2 (34.94%), GFAP (38.17%), Thy-1 (30.84%) and Rhodopsin (34.67%) in differentiation medium. 96.4 % of the population in the neurospheres was BrdU-positive cells. The cells could spontaneously adherent forming some subspheres and retinal specific cell types. Conclusion Neonatal rat RPCs possess the high degree of proliferation and can differentiate into neurons, astrocytes, retinal ganglion cells and rod photoreceptors in vitro. There are different proportions for RPCs to differentiate into specific cell types. 相似文献