Evolution of the South China Sea and monsoon history revealed in deep-sea records

As the third summary report of ODP Leg 184 to the South China Sea (SCS), this paper discusses the evolution of the East Asian monsoon and the SCS basin. A multi-proxy approach, involving geochemistry, micropale-ontology, pollen and other analyses, was adopted for reconstructing the evolutionary history of the East Asian monsoon, which was characterized by a series of paleo-climate events especially at 8, 3.2, 2.2 and 0.4 Ma. The new record indicates similar stages in the development of the East and South Asian monsoons, with an enhanced winter monsoon over East Asia being the major difference. The rich spectrums of monsoon variability from the southern SCS also reveal other characteristic features of the low latitude ocean. Evidence for the evolution of the SCS includes the hemipelagic Oligocene sediments, implying the existence of deep water environments during the early seafloor spreading stage of the SCS basin. The four major unconformities and some remarkabl ediagenetic features in upper Oligocene deposits indicate the strongest tectonic events in the region. From a careful comparison of lithologies and sedimentation rates, we conclude that the prominent differences in sedimentary environments between the southern and northern SCS were established only by ～3 Ma.     

西藏日喀则地区恰布林组物源分析

长期以来，沿西藏雅鲁藏布江南岸呈东西向展布的恰布林组砾岩，被认为是造山期后磨拉石的产物，而被置于第三纪。由于在屯穷紫色泥岩底部灰绿色粉砂质灰岩中发现腹足类化石Ｋａｔｏｓｉｒａｓｐ．，并结合其他地质证据，可以确定该组时代属于早中侏罗世。结合岩石学特征、典型砾岩中砾石的岩石地球化学和物源区分析表明，恰布林组砾岩的砾石有相当一部分来自蛇绿岩，其特征明显不同于现今的雅鲁藏布江蛇绿岩。因此认为雅鲁藏布江存在早中侏罗世之前的古蛇绿岩。     

古新世—始新世界线全球构造事件在沉积学中的反映

最新研究成果表明，古新世—始新世界线是全球构造事件的结果。这一事件在沉积学中表现为：岩性上从海绿石石英砂岩变化到粘土；粘土矿物组合从伊利石／蒙脱石为主到高岭石为主；大陆植物群的绝灭和迁移；钙质超微化石物种更新速度增长；底栖有孔虫绝灭和分异度降低；碳、氧同位素强烈负异常；大陆哺乳动物演化发生变化。     

敏感及抗性棉铃虫不同龄期幼虫神经细胞Na+通道电生理特性的比较研究

用膜片钳技术分析了棉铃虫三氟氯氰菊酯抗性品系(R)及其同源对照品系(S)不同龄期幼虫神经细胞电压门控Na^ 通道的电生理特性．结果表明，S幼虫神经细胞Na^ 通道的激活电压介于-50～-30mV，约70％细胞的Na^ 通道在-40mV左右激活．Na^ 通道电流(1Na)的峰值电压介于-30～0mV，约72％细胞的1Na在-20mV左右达峰值．R幼虫Na^ 通道的激活电压介于-50～-20mV，约60％细胞的Na^ 通道在-40mV左右激活，约30％的在-30～-20mV激活．2龄幼虫(R2)约76％细胞的1Na在-20mV左右达峰值．R3和R4均有60％以上细胞的INa在-10～OmV达峰值，即R3和R4多数细胞1Na的峰值电压向正电位方向移动．上述结果表明R幼虫神经细胞Na^ 通道功能发生了变异，同时也提示R幼虫在不同发育阶段其Na^ 通道的表达不同．     

Deep-water Earliest Oligocene Glacial Maximum （EOGM） in South Atlantic

The most prominent cooling event of the Earth surface during Cenozoic in the long-term transition from a non-glaciated planet, or “green-house world”, to a polar, glaciated planet, or “ice-house world”, is the Earliest Oligocene Glacial Maximum (EOGM) above the Eocene/Oligocene boundary at about 33.7 Ma. Planktonic and benthic foraminiferal oxygen and carbon isotopes, carbonate content, and coarse fraction, along with high-resolution color reflectance and magnetic susceptibility records during 35-30 Ma, from deep-water Sites 1262 and 1265, Ocean Drilling Program (ODP) Leg 208 in South Atlantic, reveal the global cooling event occurring in both surface and deep oceans. The results show that the earliest Oligocene δ^18O values during 33.5-33.1 Ma represent the magnitude of continental ice sheets on east Antarctica and indicate the large decrease in both surface and deep water temperatures of worldwideoceans. The δ^13C records show the large excursion during the period of EOGM event and indicate some types of shift in global carbon reservoir, probably demonstrating the sudden increase in organic carbon burial rates and the changes in the distribution and timing of production. At the same time, lithologic composition, carbonate content, color reflectance, and coarse fraction brought about significant changes close to the Eocene/Oligocene boundary, reflecting the abrupt deepening in the carbonate compensation depth (CCD). Changes in carbonate content were revealed from the color reflectance identify periodicities associated with eccentricity of the Earth‘s orbit (100 and 400 ka), further indicating orbitally forced global climate variations in the Early Oligocene.     

"经济人"对我国构建和谐社会的伦理思考

在“经济人”的市场经济条件下的当今中国，经济得到了迅猛的发展，人民获得了前所未有丰富的物质生活。但是在市场经济条件下“经济人”的工具理性也在侵蚀着伦理领域，对我国当前如何来构建和谐社会提出了重大的伦理挑战。本文试图通过对“经济人”与构建和谐社会之间的关系出发来进行探究，为解决在我国当前构建和谐社会进程中所遇到伦理问题提供一定的参考，从而为我国最终走向和谐社会奠定基础。     

多晶粉末X射线衍射法在物证司法鉴定中的应用研究

通过XRD衍射法对从交通事故案发现场中,采集的泥土A样品进行物相及成分分析,并与案发现场周边30km范围内的13个挖土工地采集的泥土样品比对,发现样品A的衍射峰及物相成分与其中5个工地所采集的泥土样品相符,肇事车辆疑属这5个工地。结果表明,多晶粉未XRD衍射法在交通事故物证司法鉴定中,具有分析时间短、见效快、成本低、科学性强的特点,为交通事故的侦破处理及打击交通违法犯罪提供更为有效、便捷、快速、科学的依据。     

Game-theoretic approach to power and admission control in hierarchical wireless sensor networks

Power efficiency and link reliability are of great importance in hierarchical wireless sensor networks (HWSNs),especially at the key level,which consists of sensor nodes located only one hop away from the sink node called OHS.The power and admission control problem in HWSNs is comsidered to improve its power efficiency and link reliability.This problem is modeled as a non-cooperative game in which the active OHSs are considered as players.By applying a double-pricing scheme in the definition of OHSs’ utility function,a Nash Equilibrium solution with network properties is derived.Besides,a distributed algorithm is also proposed to show the dynamic processes to achieve Nash Equilibrium.Finally,the simulation results demonstrate the effectiveness of the proposed algorithm.     

一种新的蠕虫检测和控制方法

在分析网络蠕虫连接请求和网络正常连接请求差异的基础上,提出一种新的蠕虫检测和控制方法.该方法针对网络蠕虫攻击特定端口以及攻击地址发散的特性,采用基于端口的多工作集区分网络蠕虫连接请求和网络正常连接请求,在蠕虫控制中使用多延迟队列处理可疑连接请求,避免了不同端口流量之间的相互影响;针对网络正常连接请求的暂时突发特征,利用令牌桶控制多延迟队列的输出,缩短了正常连接请求在延迟队列中的停留时间.测试表明,在主机感染了蠕虫后,新方法将误报率从85%降低到12%,对正常连接请求的平均延迟时间从95.4s降低到5.6s.     

Nd:YAG激光器横模选择的实验研究

本文用简单的方法测量了Nd:YAG棒的热焦距和小信号增益系数;提出了Nd:YAG连续激光器选择基横模的有效设计方法,并对这种选模技术作了实验研究,最后从理论和实验上证实,采用平—平腔加小孔尤阑选择基横模,必须根据热焦距和小信号增益系数正确设计谐振腔参数,否则加小孔光阑是徒劳无益的。