日照港煤码头堆场扩建工程规模及方案选定

介绍日照港煤码头堆场扩建工程规模和平面布置方案的选定,并对如何确定此类工程规模提出一些看法。     

FOLLICULO-STELLATE CELLS OFTHE RAT ANTERIOR PITUITARY RESPONDED TO ANGIOTENSIN Ⅱ BY INCREASING INTRACELLULAR CONCENTRATION

Objective The main purpose of this study was to investigate whether the folliculo-stellate cells (FSC) respond to angiotensin(Ang) Ⅱ by increasing intracellular free concentration ([]i) ,and where the o-rigin of mobilization is if that has occurred. Methods Pituitary cells in primary culture were prepared from male Wister rats(250g) by a conventional method and cultured in MEM supplemented with 4％ normal rat serum. Af-ter 2 days in culutre,cells were loaded with 1 μmol/L fura-PE3/AM for 1 h and subjected to a ment with Quanti Cell 700 system. Excitation wavelengths of 340 and 380 nm were selected by means of a computer-controlled filterwheel. Results The of FSC in the rat anterior pituitary was elevated by Ang Ⅱ. The eleva-tion of of FSC induced by 0. 1,1.0,10 and 100 nmol/L Ang Ⅱ was (56.33±6.18), (117.07± 36.07), (175.59 ± 40.01 ) and (216.02 ±11.52) nmol/L, respectively. The increase of of FSC induced by 100nmol/L Ang Ⅱ was not influenced by the medium without (0Ca),but significantly suppressed by thapsigargin (TG),an inhibitor of ATPase. The rate of responsive FSC to Ang Ⅱ (100 nmol/L) was 61.84％ which was obviously higher than that of pituitary endocrine cells (43.49％). Conclusion The present experiment demonstrates that the FSC in the rat anterior pituitary responds to Ang Ⅱ by increasing [which raises the possibility that Ang Ⅱ re-leased from either lactotrophs or gonadotrophs affects FSC through paracrine mechanism. The elevation of [induced by Ang Ⅱ presents a dosage-dependent relation, and is possibly because of the release of from an intra-cellular pool (s). Fashions of release are relative to the concentration of Ang Ⅱ. The results indicate that Ang Ⅱ functions as a paracrine factor among pituitary cells including FSC.     

考虑土工合成物抗滑作用的边坡稳定性分析方法

对底部铺设土工合成物的堤坝工程,本文认为土工合成物所承受的力是由堤体产生的内力;在此基础上给出了边坡稳定性的分析方法.计算表明,土工合成物的抗滑作用与滑动面所处地基的深度有关,浅层滑动时抗滑作用显著,深层滑动时抗滑作用较小.     

考虑桩土变形协调的复合地基变形计算模型的初步研究

本文针对当前求解刚性基础下复合地基沉降变形时较少考虑桩土间变形协调的情况,对若干试验结果进行了分析,并对复合地基的单桩侧摩阻力分布形状作了一定的假定,简化计算,然后联合荷载传递法,Mindlin解答和弹性力学解答得到了单桩模型中桩体和桩间土的变形计算模型。     

航空物流系统的监控及网络通信系统实现

以国内某机场货运站监控系统为平台,提出了航空货运物流监控系统中物流管理、监控通信系统总体设计构架及模块化设计方法.详细地论述了该物流系统计算机监控及网络通信的实现,并对航空物流仓库系统中采用的工业以太网和现场总线技术,进行了理论上的研究和实践中的应用.     

双VCT结合可变进气管对CA6GV发动机性能的影响

以采用双VCT和可变进气管的V6气道喷射发动机为研究对象,阐述了不同的VCT和可变进气管对发动机充气、燃烧、油耗和排放等性能的影响.结果表明,恰当的进排气VCT开度组合辅以不同的进气管容积腔状态可以有效改善发动机充气效率和降低排放:不同的进/排气门开启时刻、气门重叠角以及进气管容积腔大小对放热规目的影响不大:恰当地控制进/排气门开启时刻和气门重叠角,再结合点火提前角的优化有助于改善油耗.     

一种追尾碰撞主动防护头枕机构设计研究

根据基于安全间距的追尾防撞模型和挥鞭伤的生物力学机理,结合主动安全和被动安全的防护思想,研究了提前判断并启动主动头枕的控制策略,设计了电机控制及运动可逆的新型主动头枕机构,观测和记录了原理样机的工作状态和参数.与传统头枕相比,该主动头枕可降低追尾碰撞下乘员颈部伤害,同时弥补传统纯机械主动头枕响应滞后的不足.     

汽车车身缝隙的电磁屏蔽特性仿真研究

汽车车身缝隙是汽车电磁于扰的重要耦合途径.通过分析汽车车身缝隙的结构,提出车身缝隙的简化模型,进而建立其仿真计算模型;分别改变车身缝隙模型的相关结构参数,考察相应的电磁场屏蔽效能的变化.仿真结果表明,车身缝隙越长,屏蔽效能越低,电磁干扰越容易耦合进车内;车身缝隙越窄,电磁屏蔽效能越高;改变车身缝隙搭接部分的长度和拐角角度并不能保证提高其屏蔽效能,具体变化趋势与频率范围有关.     

行星齿轮机械式自动变速器换挡控制策略的研究

针对混合电动汽车高效传动和自动换挡的需要,提出了运用电机辅助调速实现带行星齿轮机构的机械式自动变速器换挡的控制策略.采用MATLAB/Simulink建立了换挡过程控制的模型,并进行了仿真.结果表明该控制策略能有效减小变速器换挡过程中输出转矩的波动,验证了所提出的变速方案及其控制策略的可行性.     

基于最小换乘模型的公交查询系统的设计与实现

设计并实现了含电子地图的公交查询系统,包括站点、线路和出行方案等3种查询方式.阐述了站站之间以"换乘次数最少为首要条件,站数最少为次要条件"的最优乘车路线算法:求出换乘矩阵,根据换乘矩阵计算得到经过站点的数目.实践表明系统具有较强的实用价值.