深水钻井船散料输送系统设计研究

本文以“大连开拓者”深水钻井船为例,介绍了深水钻井船散料输送系统技术研究,分析了深水钻井船散料输送系统的组成及特点,并对其设计方法进行简要阐述,为其他类似海工产品的设计和建造提供宝贵的经验。     

混合动力客车多功能整车控制系统开发

针对目前混合动力客车动力系统逐渐复杂的趋势,以减少总线节点数量和实现有效集成为目的,以Mototron为基础平台,开发出集成整车控制、离合器控制以及变速器控制于一体的多功能控制系统.经实车路试对该控制系统进行验证.     

天津市综合交通模型框架及关键技术探索

基于天津市2011年综合交通调查数据,天津市在现有交通模型基础上构建了新的综合交通模型,以满足新形势下城市与交通发展对交通定量分析的需要。新的综合交通模型仍然采用基于出行的四阶段交通模型,但通过对人口、就业岗位模型,出行产生模型,出行分布模型,方式划分模型,分配模型等模块中关键技术的探索,不仅使模型能够有效反映当前天津市“双城”结构下的居民出行特征,其框架具有较高的灵活性和良好的扩展性,同时还为下一步建立基于活动的模型奠定基础。实践表明,新的综合交通模型大幅提高了现有交通模型的精度和分析能力。     

变宽循环圆液力减速器设计与性能分析

就液力减速器轴向宽度对其制动性能的影响进行研究,提出一种变宽循环圆液力减速器设计方法,并基于三维集成仿真技术,实现了变宽循环圆液力减速器参数化自动建模与仿真计算.对不同扁平比的液力减速器内流道速度场、压力场和湍流动能耗散率分布进行了对比,并对不同扁平比下的制动转矩进行了分析.结果表明,液力减速器制动转矩随循环圆扁平比减小而降低.     

基于层次聚类分析的城乡公交线路诊断倡——以安宁市为例

合理设置城乡公交为城乡居民出行提供优质的公交服务,是打破城乡二元分割的重要手段之一。分析城乡居民出行特征和城乡公交服务特性,从公交乘客及公交企业2个角度,构建表征城乡公交线路物理、运营和公交客流特性的诊断指标体系。以安宁市15条城乡公交线路为例,对选取样本的8类指标数据进行主成分分析,经定量分析各成分贡献率后,确定出3个主成分(贡献率累计为92%)。将主成分作为城乡公交线路层次聚类分析的变量,作出线路的聚类关系图,构建判别函数定量诊断四类线路。结合实际验证了指标体系的合理性及诊断方法的有效性。提供了1种较准确高效的城乡公交线路诊断方法,并为城乡公交线路的优化与运营调整提供决策依据。      

AT供电系统接触网在线防冰电流的决策与控制

为了保障行车安全,消除接触网覆冰,针对电气化铁路AT(autotransformer)供电系统特殊的长回路和短回路结构,建立防冰系统投入后AT供电系统的电路模型.用该模型分析各AT段内防冰电流和负载电流的分布,得到保障全线防冰所需电流值;根据防冰电流与供电臂末端电压的关系,得出了牵引网压允许的防冰电流值;在此基础上,制定了以温度为目标的在线防冰电流决策流程.以某AT供电区段为例,结合实测负荷数据进行了仿真,结果表明:投入的防冰电流值至少为接触网临界防冰电流值的2倍,才能使接触线表面温度维持在0 ℃以上.      

赣江下游地区各类非点源污染源的影响研究

在国内外相关研究基础上,利用输出系数模型估算了2006-2009年赣江下游流域非点源污染负荷及各类非点源污染源的贡献率。结果表明,畜禽养殖、农业人口和耕地是赣江下游地区非点源污染负荷的主要来源,在TN贡献率方面畜禽养殖>耕地>农业人口,在TP贡献率方面畜禽养殖>农业人口>耕地。针对估算结果,分析了赣江下游地区畜禽养殖、农业人口和耕地形成非点源污染流失的原因,并据此提出建造化粪池等小型污水处理设施和人工湿地等相应的控制措施。     

珠三角港口改造引发的通航安全问题

以沙角B电厂煤码头水工结构加固改造工程为实例,对珠三角地区港口改造升级引发的水上通航安全问题进行探讨,提出了改造方案和水上安全生产对策,为港口码头改造升级服务.     

Comparative study on ghrelin level change and its related factors in hypertensive elders with psychological distress

Objective To investigate the change of plasma ghrelin level and explore the related factors of ghrelin alteration in elderly hypertensive patients with psychological distress. Methods A total of 300 elders, who were screened with Hamilton Anxiety Scale (HAMA), Hamilton Rating Scale for Depression (HAMD), and the Symptom Checklist-90 (SCL-90) for psychological stress and somato-psychological manifestations respectively, were divided into hypertension group (n=148) and non-hypertension group (n=152). Their blood samples were collected to measure the plasma level of ghrelin and total cortisol on the same day. Results The incidences of anxiety and depression were 27.7% and 11.7%, respectively, in all the enrolled elders. However, the rates of psychological distress, particularly anxiety, were significantly higher in the hypertensive elders than in the non-hypertensive ones (43.2% vs. 12.5%). Anxiety was positively related to the cortisol level but negatively related to the plasma ghrelin level, and the latter two were negatively correlated with each other. Conclusion Chronic increase of plasma cortisol induced by long-term anxiety can lead to the reduction of ghrelin level, which then adversely affects blood pressure in elders with psychological distress. Therefore, ghrelin might be a selective antihypertensive medicine for hypertensive elders with anxiety.     

Inhibitory action of docetaxel on the proliferation of HeLa and SiHa cells

Objective To study the inhibitory action of docetaxel (DOC) on the proliferation of HeLa and SiHa cells. Methods Cell morphological changes were observed with inverted phase contrast microscope. MTT was adopted to test and calculate the cell inhibition ratio. Flow cytometry was used to detect cell cycle. Results DOC had an obvious concentration-dependent inhibitory effect on the proliferation of both HeLa and SiHa cells. The inhibition ratio of DOC on SiHa was significantly higher than that on HeLa (P<0.05). DOC blocked HeLa at G2/M phase. Under the effect of DOC, the cell cycle of SiHa was not changed much. Conclusion DOC has an obvious inhibitory action on both HeLa and SiHa cells, which shows a promising prospect of DOC in clinical treatment of cervical cancer.