基于和分解有限变形力学理论的深部软岩巷道开挖大变形数值模拟分析

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Simulation is essential for embedded control systems with task jitter

Sampling or task jitter affects the performance of digital control systems but realistic simulation of this effect has not been possible to date. Our previous work has developed a novel method to simulate sampling jitter in MATLAB/Simulink simulation software where the jitter is generated randomly. What has been missing is a way to capture sampling jitter from a target platform and then feed this timing information into the simulation. This paper presents a low-cost and novel solution to these problems. The method uses an Arduino board to capture task jitter from two different hardware platforms with multiple stressing conditions. Then the recorded performance data is used to drive realistic simulations of a control system. Measurement shows that the task jitter data does not follow any specific random distribution such as Gaussian or Uniform. Furthermore, very occasional timing patterns, which may not be picked up while testing a real system, can result in extreme controller responses. This novel method allows comparisons of different platforms and reduces the effort required to choose the most appropriate platform for full implementation.

     

显微荧光光谱参数及其应用

显微荧光光谱技术具有微区原位测试优势,可弥补生物标志化合物方法难以进行微区测试的不足,已应用于原油物理性质、成熟度、烃源岩、油源对比和成藏期次划分等方面.但是,通常使用的λmax、Imax、Q650/500和Qf535等光谱参数尚无明确的地球化学意义,且受到生物降解、层析作用等影响,应用局限性较大.为了优化显微荧光光谱技术,改进其在石油地质研究中的应用效果,在分析显微荧光光谱参数的基础上明确了系统建立荧光光谱参数并揭示其地球化学意义的基本思路,指出了完善荧光光谱参数体系,在生物降解和层析作用下开展油气运移,通过综合测试分析解决荧光光谱法的多解性研究方向.     

基于SEBAL模型的浙江省区域蒸散发量估算研究

地表蒸散发(ET)是地气相互作用中水分平衡的重要部分.利用新一代对地观测数据MODIS,基于地表能量平衡的SEBAL模型,对浙江省2006年8月2日和11月4日的蒸散发进行了反演.结果表明,蒸散发具有明显的时空差异性,由于温度更高,夏季的日蒸散发量明显高于冬季,可达到10 mm/d以上.另外,在地表水含量丰富、风速较大处以及水体周围蒸散发量相对较高.     

Monitoring hacker activity with a Honeynet

The Honeynet Project was founded by 30 US based security professionals with the intention of researching the techniques, tools, tactics and motives of hackers and the ‘blackhat’ community in general. A Honeynet Project is an all volunteer, non‐profit organization committed to sharing and learning the motives, tools, and tactics of the hacking community. It is comprised of a number of information security professionals dedicated to honeynet research and information security. This paper outlines the technical configuration of a honeynet, presents some of the key attacks on the honeynet to date and provides recommendations for securing networked systems. Copyright © 2005 John Wiley & Sons, Ltd.     

Immunoaffinity method to identify aggregin, a putative ADP-receptor in human blood platelets

The ADP-receptor on the surface of human platelets and cells of megakaryocytic lineage has been classified as P2T purinergic receptor for which ADP is an agonist and ATP is an antagonist. Although it is one of the earliest identified of the important cellular receptors, it has neither been purified nor cloned. We have developed an immunoaffinity method for rapidly identifying the platelet ADP-receptor and this method can be extended to the purification of the receptor. A polyclonal antibody to glutamate dehydrogenase (GDH) covalently modified by 5'-p-fluorosulfonylbenzoyladenosine (FSBA) recognized neither FSBA nor glutamate dehydrogenase. Immunoblot of the gel obtained by sodium dodecyl sulfate-polyacrylamide gel electrophoresis of solubilized FSBA-labeled platelets showed the presence of a protein band at 100 kDa and this band was absent in the immunoblots of platelets that were preincubated with ADP and ATP or covalently modified by the chemically reactive ADP-affinity analogs, 2- and 8-(4-bromo-2,3-dioxobutylthio)adenosine-5'-diphosphate (2- and 8BDB-TADP) and 2-(3-bromo-2-oxopropylthio)adenosine-5'-diphosphate (2-BOP-TADP), prior to treatment with FSBA. FSBA as well as 2- and 8-BDB-TADP and 2-BOP-TADP have been previously shown to inhibit ADP-induced platelet responses by selectively and covalently modifying aggregin (100 kDa), an ADP-receptor in intact human blood platelets. The results show that polyclonal antibody to FSBA-labeled GDH is capable of recognizing FSBA-labeled aggregin on platelets and, thus, could be used to purify aggregin by immunoaffinity column chromatography. The immunoaffinity method was found to be far more sensitive than the radiochemical methods to identify aggregin previously developed in our laboratory. Since FSBA is also capable of reacting with enzymes that require ATP for their catalytic function, the polyclonal antibody may be used to identify and purify other P2-type purinergic receptors that require binding of ATP before eliciting cellular responses.     

主要腐殖型凝析气藏的成熟度特征

凝析气约占中国已发现天然气资源的1/3,腐殖型凝析气是其重要组成部分。前人基于模拟实验,对腐殖型凝析气的成熟度分布范围进行过研究,但其结果差异较大,需用实际资料进行验证。经统计分析国内外主要腐殖型凝析气藏的156个凝析气甲烷碳同位素、72个凝析油甲基菲比值和甲基菲指数数据,结合腐殖型有机质生烃演化模式,发现腐殖型凝析气成熟度主要为R_o=0.57%~1.36%,在R_o=0.49%~0.57%和R_o=1.36%~2.28%时也具有一定的生气潜力。处于这3个阶段的腐殖型烃源岩均可排出凝析气,经运移聚集,可形成常规凝析气藏,留在烃源岩内部的可形成页岩凝析气藏。其中,R_o=0.57%~1.36%的腐殖型凝析气藏是重要的勘探目标区。     

西峰油田延长组长8段储层流体作用期次分析

采用显微荧光技术以及包裹体显微测温技术,结合鄂尔多斯盆地西峰油田埋藏史及地热史演化过程模拟,确定了该区油气运移主要分两期,第一期发生于中、晚侏罗世,第二期发生于早白垩世末期,该期是鄂尔多斯盆地西峰地区中生代油气运聚的重要时刻。油气运聚的第一期和第二期分别对应于早成岩B期和晚成岩A期成岩阶段。由于该区盐水包裹体以石英裂缝中形成的为主,包裹体的保存条件相对较差,使得均一温度具有一定的多解性,因此制定了裂缝中流体包裹体测温数据应用的筛选原则,为类似情况流体包裹体的应用提供了参考。     

双膜法液体盐概述

介绍了液体盐在国内两碱行业的应用现状及发展趋势,将双膜法液体盐技术与其他盐水精制技术做了技术经济比较,突出了双膜法液体盐产品的优势,展现了双膜法液体盐在国内两碱行业的应用前景。     

Constrained sintering kinetics of 3YSZ films

3YSZ green layers approximately 10 μm thick were screen-printed onto 3YSZ substrates and their constrained sintering kinetics were measured at 1100-1350 °C using an optical dilatometer. The densification rates of the same powder in the form of pellets and free-standing films were also measured. The constrained densification rate was greatly retarded compared with the free densification rate at a given temperature and density. The retardation increased with increasing density and temperature and could not be properly accounted for by existing theories of constrained sintering. As a result the apparent activation energy is much lower for constrained sintering (135 ± 20 kJ mol⁻¹) than for free sintering (660 ± 30 kJ mol⁻¹). It is proposed that this is because the constrained microstructure exhibits larger and more widely separated pores at the higher temperatures.