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In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

Results showed that L-THP possessed negative inotropic and negative chronotropic action, lowed left ventricular pressure and it's infinitesimal calculus, decreased heart output in per min., shorten 〓 and 〓 of action potential of ventricular papillary muscle of guinea pig and even the plate-phase of action potential disappeared in larger dose group , but prolonged 〓. we studied transmembrane transportation of 〓 after administering L-THP , L-THP not only depressed uptake and increased release of Ca 2+ in normal myocardium, but also it showed stronger inhibition in cell injured by ISO, and fully eliminated the effect of ISO increasing uptake and decreasing release of 〓. By detecting the 〓 content of ventricular single myocyte using fluorescent probe Fluo-3/AM, results correspond to that done above, L-THP decreased 〓 content inside of cell significantly. Using whole-cell mode, we observed the effect of L-THP on Ica in ventricular single cell, it was found that L-THP decreased Ica, the effect increased with increasing it's dose, and had voltage, frequency-dependency. Dose highly corelated to effect, corelative constant is 0.87. When washing cell with normal tyre's solution, Ica could recover, which proved the blocked action of L-THP on calcium channel once again. Meanwhile, L-THP reduced production of MDA in heart injured by ISO in dose-dependent manner, improved content of GSH-Px, in case tissue or cell free from free radical damage.

结果显示，该药物具有负性肌力和负性频率作用，降低左室压及其微分，终使每分心输出量减少；缩短豚鼠心室乳头肌动作电位时程的〓和APD〓，大剂量使动作电位平台消失，〓延长；同位素示踪法研究证实L-THP抑制〓摄取，促进〓释放，降低细胞内的〓含量；单通道水平的研究证实，L-THP减少豚鼠心室肌单细胞内向钙电流，且具有剂量，电压，频率依赖性，其作用易于洗脱，药物剂量与Ica也具有高度相关性（相关系数r为-0.87）；L-THP还可抑制ISO损伤心肌组织所致的丙二醛含量增加，增加谷胱甘肽过氧化物酶的量，使组织细胞免受损伤。L-THP阻断L-型〓通道，抑制〓的摄取，促进〓的释放，降低细胞内〓含量L-THP作用的离子基础。

Furthermore, in the CTA rats, compared with water stimulability, FLI neurons of SON and DMV induced by sucrose stimulability had had much more expressions.6 When the same sucrose stimulability was given, FLI neurons expressions of SON, DMV and LH in the CTA rats were much lowwer than that in the control rats.Conclusions:1 CTA had an inhibitory effect on small intestine peristalsis, indicate taste preference has an effect on small intestine peristalsis, and inhibitory effect induced by CTA is corresponded with US, this effect may have relations with vagus efferent never and humoral regulation.2 In the electrophysiology experiment, discharges of vagus efferent never in the CTA rats are much more than that in the control rats, indicates taste and taste preference may regulate small intestine peristalsis via vagus nerve, and dicharge can continude 1 hour, indicate humoral regulation also exists in the regulation.

结论1建立味觉厌恶对小肠运动有抑制作用，提示味觉嗜好性对小肠运动有影响，而且味觉厌恶引起抑制作用是与条件刺激成对应关系的，味觉刺激引起的小肠蠕动的抑制作用可能与迷走神经传出神经及体液调节有关。2在电生理实验中，CTA大鼠迷走神经传出放电高于对照组的大鼠，提示味觉及味觉嗜好性可能是通过迷走神经对小肠运动进行调节的，放电至能持续60min，表明味觉及味觉对小肠运动的调节中还有体液调节的参与。

The results showed: for the toxicity of two kinds of pollutants, the Cd(superscript 2+) is more poisonous that the Pd(superscript 2+). For the sensitivity to the pollutants, the P. caudatum, C cathayensi and D. japonica increase evidently in turn. The statistical analyses indicated that the single and combined toxicity effects both increase with the exposed time extended, especially for the combined toxicity (P.05), showing a marked time-effect relation. As for the single effect, ii increase prominently with Pb(superscript 2+) and Cd(superscript 2+) concentrations (P.05); But in the case of binary effect, the results showed obviously a time-effect (P.01) as well as a concentraction-effect relations.

结果表明：在同等条件下，Cd(上标 2+)对三者的致毒效应都明显强于Pb(上标 2+)；3种动物中，草履虫最敏感，而圆田螺耐受能力最强；随单一毒物浓度的增大以及暴露时间的延长，两者的致毒效应都显著增大，表现出明显的浓度－效应和时间－效应关系；二者复合作用时，对3种动物的致毒效应主要表现为与二组分的浓度比例有关。

The pressor effect of adenosine was due to carotid body cheoreceptor activation. However, a slight increase of ABP induced by intracarotid bolus injection of adenosine following the section of carotid sinus nerves was observed in a few rats, which implied that the central effect might be involved in the pressor effect of adenosine. The delayed effect of adenosine may be attributed to the direct actions (including the negative chronotropic action, thenegative dromotropic action, the negative inotropic action and the vasodilator effect) of adenosine on the heart and blood vessels.

前一效应主要与颈动脉体化学感受器的激活有关，但在少数动物，颈动脉内注射腺苷的升压效应在切除窦神经后并未完全消除，表明腺苷有可能进入神经中枢而发挥作用；后一效应可能由腺苷直接作用于心脏和血管，通过其负性变力、变时、变传导和血管扩张等作用，导致心脏自律性降低，输出量减少和外周阻力下降。

In market aspect,MNEs have rigidity of market crowding out,can possess market rapidly and potentially,build the bulwark of market entering,while it also has absolute advantage of brands. At the same time,they also develop a pattern of value chain of vertical specialization,by which,Chinas enterprises may have a chance to get into MNEs global value chain and acquire market room. In industry aspect,while MNEs control the industry by stock property and the advantage of brands,they provide a chance of industrial transfer and industrial linkages. Chinas enterprises could strengthen industrial linkages and achieve industrial drive by technology innovation and agglomeration effect. In technology aspect,because of the nature of MNEs technology monopoly,Chinas enterprises must face the dilemma of technology dependence,technology unadaptability and technology trap. But MNEs may also transfer technology to Chinas enterprises by competition effect,demonstration effect and cooperation effect. Moreover,Chinas enterprises could make use of MNEs investment of "oligopolistic reaction"in China to accelerate technology transfer.

在市场层面，跨国公司对中国企业具有市场挤出的刚性，市场占有速度快、潜力大，构筑市场进入壁垒，具有绝对品牌优势，但也在中国形成垂直专业化分工的价值链模式，中国企业获得链入跨国公司全球价值链，获取自身市场空间的机会；在产业层面，跨国公司借助股权安排和品牌优势实施产业控制，但也提供了产业梯度转移和产业关联的契机，中国企业可以通过技术创新和聚集效应，增强产业关联，实现产业带动；在技术层面，跨国公司出于技术垄断本性，使中国企业面临技术依赖、技术非适应性甚至技术陷阱的困境，但也通过竞争效应、示范效应、合作效应对中国企业进行技术转移，中国企业还可以利用跨国公司在华&寡占反应&投资，加速技术转移。

Results AE from CM had vasodilating effect on the contracti on of mesentery blood capillary in guinea pigs and the contraction of rat thoracic aortic ring induced by l0μmol/L phenylephrine, even under the condition of pre-treating with glibenclamide (1μmol/L) or propranolol (3μmol/L). When the endothelium of the rat thoracic aortic ring was removed, AE from CM had not vasodilating effect hut constrictive effect. AE from CM could also increase the contents of NO, NOS and cNOS in the aortic tissue and had no obvious effect on the NO content in plasma and iNOS in aortic tissue of rats.

结果 桑白皮丙酮提取物有抑制去甲肾上腺素收缩豚鼠肠系膜微血管的作用，抑制苯肾上腺素(10μmol/L)收缩离体大鼠胸主动脉环的作用，预加优降糖或普蔡洛尔(3μmol／L)后仍然有松弛作用；大鼠胸主动脉环去内皮后药物无松弛作用，反而起收缩作用；显著升高血管的NO和NOS、cNOS含量，对大鼠血浆的NO和血管iNOS的含量影响不大。

The impact of circulation on industrialization is to promote and coordinate the lubricating effect,the ripple effect,the inductive effect;while the impact of industrialization on circulation is mainly seen in the pulling effect,the buttressing effect and the infiltrating effect.

流通对工业化的影响可概括为促进与协调润滑效应、波及效应、诱导效应；工业化对流通的影响主要有拉动效应、支持效应和渗透效应。

The first chapter of the paper mainly states the research of HPM source and HPM appliance based on the transit-time effect,the second chapter introduces a variety of HPM source in investgating course,capability,fabric,research condition,developing tendency aspects and so on,the third chapter descants HPM source based on the axial transit-time effect , the radial transit-time effect and the low diode impedance HPM source based on the axial transit-time effect,the forth chapter includes a conclusion of HPM source and HPM appliance based on the transit-time effect,and gives a assumption of the work in the future.

本文第一章主要简述了高功率微波源和基于渡越时间效应的器件的研究情况，第二章从研发过程、性能参数、结构特点、研究现状、发展趋势等方面系统介绍了各种高功率微波源。第三章则从各个方面详尽介绍了基于轴向渡越时间效应、基于径向渡越时间效应的器件以及低阻抗的轴向渡越时间振荡器，第四章则对高功率微波源和基于渡越时间效应的器件的发展做出了结论，并对以后的工作提出了构想。

The proportion of rents that firms get depends on their network capability. This reveals the essential relationships between network resource, network rents and network capability: First of all, network rents come from the network resources. Furthermore, network rent is the representative of the competitive advantage and the value of the network resource. Second, network resource is the foundation of the network capability, the function of network capability is activated in the process of using network resource by firm. It enables the network resource to be a potential value resource of the competitive advantage. At last, network capability activates the network rents in the network resource, and make sure that the firm get the additional benefit;(4) the network capability can be classified as: network visioning capability, network constructing capability, network operating capability and network constructing capability. Some factors, such as maturity of IT, openness of culture, management system involved, experience of participation in network, have a positive effect on the network capability of the firm;(5) the impact of network capability on innovation performance is realized through knowledge transfer between network partners, namely, knowledge transfer is the mediator; and (6) the type of innovation network, exporation network or exploitation network, has moderator effect on the relationship of network capability and knowledge transfer, and network capability and innovation performance as well. In the exploration network, network constructing capability has more effect on the performance of the knowledge transfer and innovation. In the exploitation network, network operating capability has more effect on the performance of the knowledge transfer and innovation.

通过对创新网络环境下网络资源、网络租金和网络能力的概念界定和内涵分析，本研究辨析了三者之间以及它们与竞争优势之间的本质关系：首先，网络资源是网络租金的来源，而网络租金是企业竞争优势的表征，也是网络资源的价值体现；其次，网络资源是网络能力的基础，而网络能力在运用网络资源的过程中发挥其作用，实现了网络资源成为竞争优势源泉的内在价值；最后，网络能力激活了蕴涵在网络资源中的网络租金，并确定企业获得这种额外收益的份额，网络租金正是网络能力发挥作用的成果；(4)企业网络能力可以分成网络规划能力、网络配置能力、网络运作能力和网络占位能力四种，本研究的实证结果表明企业的IT成熟度、文化开放度、网络管理体系和网络活动经验都能够正向影响企业的网络能力水平，因而企业可以通过改善上述各种因素的水平来实现提升企业网络能力的水平；(5)企业网络能力对企业创新绩效的促进作用更多地是通过正向影响知识转移实现的，即知识转移在其中起到了中介作用；(6)创新网络的类型，即探索型创新网络和利用型创新网络，分别在网络配置能力和网络运作能力与知识转移之间的关系中，以及在网络配置能力和网络运作能力与创新绩效之间的关系中起到调节作用，在探索性创新网络中，企业的网络配置能力对提升企业获得的知识转移绩效和创新绩效更为重要；而在利用性创新网络中，企业的网络运作能力对提升企业获得的知识转移绩效和创新绩效更为重要。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。