工程机械和建材机械的盛大展会

德国慕尼黑国际博览集团是享誉全球的国际化大型博览公司,是世界上最重要的十大展览公司之一。自2002年始与上海新国际博览中心共同组织了两年一届的中国国际工程机械、建材机械、工程车辆及设备博览会(BAUMA CHINA)。2004年该博览会吸引了来自27个国家的738个参展商,展会场地达10万平方米,观众来自100个国家约5万多人(国外观众占21%)。鉴于中国使用工程机械、建材机械较多的交通运输业、建筑业、能源建设、水利水电建设等行业都保持了很高的发展速度,中国工程机械市场将是一个持续和不断成长的市场。2006年11月21—24日将在上海新国际…     

盐湖沉积储层孔隙结构特征及演化模式--以马王庙油田为例

盐湖沉积条件下的沉积环境及储集层特征等具有与淡水沉积不同的特征,通过对江汉盐湖盆地马王庙地区储层孔隙结构特征的研究,揭示了孔隙结构的宏观及微观特征.该区新沟咀组下段砂岩储层孔隙类型以粒间溶孔为主,喉道主要为片状、弯片状及点状喉道.Ⅱ、Ⅲ油组的物性比Ⅰ油组好,平面上孔隙分布具分区性.孔喉配置主要为大孔中喉,次为大孔粗喉及中孔中喉.孔隙结构受沉积环境及成岩作用的影响.以马36井Ⅱ油组砂岩为例,建立了孔隙演化定量模式.     

Study on a Distributed Wavelength Routing Algorithm in WDM Optical Transport Networks

A new design scheme for a distributed algorithm for routing and wavelength assignment (RWA) is developed in this paper, and the communication rules between the nodes to exchange signaling packets are discussed. The Adaptive-Alternate-Routing-Least-Load (AARLL) algorithm is implemented in the distributed scheme for the first time. Under dynamic traffic circumstances, the influence of the race condition, which does not exist in centralized scheme, on the network performance is analyzed and the analyzed results show that the race condition has a major impact on network performance only under light traffic load, while under medium and heavy traffic load the impact is very small. To analyze the performance loss caused by adopting the distributed algorithm for RWA, the capacity loss factor (CLF) is introduced and the calculated results show that CLF does not exceed 6% under medium traffic load.     

FR139317, a specific ETA-receptor antagonist, inhibits cerebral activation by intraventricular endothelin-1 in conscious rats

A comprehensive series of time-related behavioral, physiological and cerebral metabolic studies was conducted using conscious Sprague-Dawley rats to discern the anti-endothelin (ET) properties of the specific ETA receptor antagonist, FR139317. Endothelin-1 (9 pmol given by injection into one lateral ventricle, i.c.v.) produced convulsions, acute arterial hypertension, arterial hyperglycemia, and hyperventilation. Brain structures close to the i.c.v. site of injection, such as the caudate nucleus, lateral septal nucleus, corpus callosum and hippocampal CA3 medial lamellae, as well as 14 other individual structures, displayed moderate-to-intense levels of metabolic activation after endothelin. Data were assessed quantitatively by means of the autoradiographic [14C]deoxyglucose technique combined with image analysis. Neural circuits in the efferent projection paths of the stimulated forebrain structures, such as the midbrain oculomotor complex, amygdaloid nuclei, substantia nigra pars reticulata and caudal subicular subregions of the hippocampal formation, were stimulated focally by endothelin. Specific medullary nuclei and cerebellar cortical subregions displayed high rates of glucose metabolism following endothelin injection at the time of maximum behavioral and physiological stimulation. I.c.v. treatment with > or = 14 nmol FR139317 before endothelin significantly inhibited the effects produced by the peptide. At the highest dose of FR139317 (28 nmol), there was only mild behavioral stimulation following endothelin injection, and hypermetabolic responses in the brain were abolished except in two specific areas of the cerebellar cortex (approx 40% increases in metabolic activity in the copula pyramis and paramedian lobule). The results indicate that the cerebral stimulatory effects of i.c.v. endothelin are mediated by the A type of endothelin receptor. By itself, i.c.v. FR139317 had no effects on the parameters assessed. Further evaluation of FR139317 is warranted as a possible therapeutic agent for neuropathologies suspected of deriving from central neural or vascular stimulation by endothelin, such as aneurysmal vasospasm, ischemia, excitotoxicity, and peptide-mediated epilepsies.     

SiC粒子增强铸造Al基复合材料的研制

本文用真空烘烤封罐法对 SiC 粒子进行预处理,在固液两相区内搅拌添加,制造了铸造 Al 基复合材料。测试表明,该复合材料具有铸造性能好,力学性能高的优点,适用于采用压铸、石膏型精密铸造、金属型铸造等工艺方法成型的活塞、连杆等要求苛刻的零件。     

可靠性研究在油气田勘探中的应用——地震层速度资料用于含油气层厚度定量解释的可信度分析

本文引入可信度这一基本概念及其有关知识.对用于含油气层厚度定量解释的地震层速度资料的可信度进行了分析研究,对汤原凹陷地震层速度资料用于解释1000米埋深下100米厚的地震层内25米厚的欠压实泥岩层、正常压实的泥岩层、含气砂层和含油砂层的最大可信度.分别为76.1、61.0、43.4和25.4;解释500米埋深下对应厚度的上述各地层的可信度分别为75.4、67.9、56.8和29.3.     

论黄河三角洲流路演变及河口治理的指导原则

通过分析黄河三角洲流路演变中溯源堆积及溯源冲刷对典河下游河道影响的范围，幅度和作用历时，提出在黄河泥沙从根本上减少之前，河口治理的指导原则应是在有利于工农业发展和有利于防洪防凌前提下，有计划地安排河口流路。     

气固流化床中非线性特性的多尺度分析

Deterministic chaos theory offers useful quantitative tools to characterize the non-linear dynamic behavior of a fluidized bed and the developed complexity theory presents a new approach to evaluate finite sequences. In this paper,the non-linear,hydrodynamic behavior of the pressure flutuation signals in a reactor was discussed by chaos parameters and complexity measures.Coherent results were achieved by our multi-scale analysis,which further exposed the behavior in a gas-solid two-phase system.     

里石门水电站泄漏电流及直流耐压试验分析与改进

分析在水电站进行泄漏电流试验及直流耐压试验中产生各种问题的原因，并提出了解决和改进的方法。图1幅，表3个。     

奇异值分解对非定常约束多体系统的动力学分析

通过对约束方程的雅可比矩阵进行奇异值分解，定义组合坐标，从拉格朗日第一类方程出发，建立了非定常约束多体系统的纯微分方程，给出了动力学数值分析的过程，最后举了一个算例。