高速铁路的发展对民航的冲击及反思

在分析我国铁路高速化发展趋势及特点的基础上,研究了高铁发展对民航运输业、航空公司及航空消费群体3个方面的冲击与影响,并进一步探讨了民航的应对策略,从而给我国高铁的健康发展以有益的启示.     

高速铁路列控车载设备的发展

通过对车载设备概况的分析,主要介绍车载设备的发展、组成以及主要功能。     

基于累积前景理论的机场群旅客出行决策行为分析

基于累积前景理论研究了机场群旅客出行决策行为.针对不同出行需求的旅客,综合计划延误时间、票价、出行在途时间“可靠性”和“不可靠性”动态设置出行决策参考点,并考虑航班容量限制因素,构建了旅客出行选择模型,并将实证调查数据分别与累积前景理论和期望效用理论仿真结果进行对比验证.研究表明：前景理论模型能够有效地描述机场群航空旅客的出行路径决策过程,旅客选择行为随着出行目的不同而不同;与期望效用理论模型比较,该模型对描述航空旅客决策行为具有更好的适应性.因此,机场应根据自身市场定位并结合旅客有限理性特点优化航班频率、票价和航线网络结构.     

MCFC GENERATING SYSTEM BY MEANS OF COAL IN CHINA

IntroductionTo generate electricity from the fuel cell is bymeans of utilizing the electrochemistry reaction ofthe combustible gas ( H2 ,CH4etc.) in the fuel cellstack. The coal in solid state can't be directlyused. All the combined cycle generating systemcomposed of the coal as fuel and the fuel cell de-mands to realize the gasification of coal. This pa-per studied the possibility of utilization and devel-opment of the combined cycle generating systemthatis composed of the coal and the molt…     

离子镀奥氏体Fe-Mn基合金表面改性层耐蚀性研究

在奥氏体Fe-Mn基合金表面离子镀1Cr18Ni9Ti不锈钢薄膜,改性后的Fe-Mn基合金在1 mol/L Na2SO4溶液中的耐均匀腐蚀性能和在1%NaCl溶液中的抗点蚀能力均明显优于未改性Fe-Mn基合金,甚至略优于1Cr18Ni9Ti不锈钢.Fe-Mn基合金表面改性后的耐蚀性,主要取决于改性层的结构、成分和缺陷.     

PROTECTIVE EFFECTS OF CALCIUM ANTAGONIST ON VASCULARSYSTEM AGAINST TOXICITY INDUCED BY MERCURIC CHLORIDE

Asametalelementinnature ,mercuryhastox iceffects .Recentresearchhasshownthatmercuryandmercurycompounds ,iftakenexcessively ,canproducebadeffectsofdifferentdegreesonthebody ,suchastheinfluenceontheanabolismofneurotransmittersaswellasitscombinationwiththereceptor ,andevensignalingamongthenervecells.Studiesonthecardiovasculareffectofmercuryarelimited .Someresearchesdemonstratedthatmercuryaffectheartrateandatrioventricularconduction ,leadingtothedecreaseinheartrateandthelength eningofPR interval …     

浅谈公路工程监理

经过参与公司工程监理的实践,通过归纳总结,简要介绍一下关于工程监理方面的一些认识见解以及在监理工作过程中怎样展开具体的工作.     

肺组织灌注前后双向电泳的比较

目的寻找更加有效的双向电泳方法以展示肺组织蛋白。方法取6只Wistar大鼠随机分为对照组和灌注组,用丙酮/三氯醋酸法提取肺组织蛋白并进行双向电泳分离,将2-D胶银染后用ImageScanner扫描仪扫描,采用ImageMaster 2-D Elite 3.10软件进行图象分析。结果对照组2-D胶的蛋白点计数为1 095±5,灌注组蛋白点计数为1 569±10。在分子质量30-70 ku范围内,灌注组的蛋白点计数显著高于对照组(P<0.01),在其他分子质量范围内二者蛋白点计数无显著性差异。在pH值5-8、9-10范围内,灌注组的蛋白点计数显著高于对照组(P<0.01),在其他pH值范围内二者蛋白点计数无显著性差异。结论生理盐水灌注法可显著减少肺组织中的血液蛋白成分,使得肺组织蛋白可以更好的在2-D胶上展示。     

大黄素和黄芪多糖对大鼠实验性肝癌的抑制作用

目的研究大黄素与黄芪多糖对大鼠实验性肝癌的抑制作用并探讨其机制。方法采用二乙基亚硝胺(dieth-ylnitrosamine,DEN)诱发大鼠肝癌模型。50只清洁级雄性SD大鼠随机分为5组:正常对照组、肝癌模型组(DEN诱癌)、大黄素组(诱癌同时给大黄素)、黄芪多糖组(诱癌同时给黄芪多糖)、大黄素和黄芪多糖联合给药组(诱癌同时联合用大黄素和黄芪多糖干预),每组10只。联合灌胃14周。实验第18周处死所有大鼠,检测血清ALT、ALP、γ-GT和AFU,并行肝脏病理检查,用SABC法检测谷胱甘肽-S-转移酶(GST-P)、转化生长因子β1(TGF-β1)的表达情况。结果造模各组大鼠的ALT、ALP、-γGT、AFU均明显升高(P<0.05),两种药物干预可以减轻肝脏损害(P<0.05)。病理检查证实各实验组大鼠均诱发出肝癌。两种药物均能减少GST-P和TGF-β1的表达(P<0.05),但联合应用未显示明显的协同作用。结论大黄素、黄芪多糖干预治疗可以减轻肝损害,降低肝癌标志物GST-P的表达。抑癌作用可能与这两种药物抑制了肝癌组织TGF-β1的表达有关。     

Research on Nonlinear Dynamic Simulation and Fatigue Reliability Life Prediction for Synthesis Transmission System of Self-Propelled Gun

Aiming to the puzzle that the inner load of nonlinear synthesis transmission system is difficult to obtain, a new kind of virtual prototype establishment and simulation method is put forward. The influence on nonlinear vibration with flexible rotor, bearing backlash is analyzed based on a virtual prototype. To validate the virtual prototype of nonlinear gear transmission system, the corresponding test platform is established. The consistency between simulation results and test results proves that the simulation results of the virtual prototype can be used to calculate the fatigue reliability life of key components. A new kind of fatigue reliability life prediction method of gear system considering multi-random parameter distribution is put forward based on the fatiguestatistic theory. Considering the periodicity of gear meshing, linear interpolation method is adopted to obtain the stress-time course of random load spectrum based on the gear’s complicated torque provided by virtual prototype. The gear’s P-S_a-S_m-N curved cluster can be simulated based on material’s P-S-N curve. The simulation process considers the parameter distributions of stress concentration coefficients, dimension coefficients and surface quality treatment coefficients, and settles the puzzle that traditional test methods cannot acquire the gear’s fatigue life of all reliability levels. This method can provide the distribution function and the interval of fatigue reliability life of gear’s danger region, and has a guide meaning for the gear maintenance periods determination and reliability evaluation.