基于Sesam的柔性连接浮式栈桥波浪动力特性分析

为了保证浮式栈桥能够在波浪中正常使用,基于三维势流软件Sesam对系泊浮式栈桥的运动响应与缆绳张力进行非线性时域耦合数值预报。分析了桥节间有无缆绳连接、浪向角等因素对浮式栈桥运动响应的影响。计算结果表明,浮式栈桥的运动响应与缆绳张力受缆绳连接与浪向的影响很大。在有义波高为1.25m谱峰周期为6s时,有缆绳连接的桥节间相对纵荡最大幅值是无缆绳连接时的0.54倍;当浪向为90°时,浮式栈桥横荡方向与垂荡方向运动幅值范围最大;当浪向为105°时,桥节间相对纵荡运动幅值最大。综上所述,桥节间有缆绳连接可以大幅度减少其相对运动幅值,在布置浮式栈桥时,建议选取浪向角为150°~180°。     

Reconstructing the food structure of ancient coastal inhabitants from Beiqian village: Stable isotopic analysis of fossil human bone

The Beiqian site located in Jimo city,Qingdao,a few kilometers from the modern coastline was excavated in 2007,2009 and 2011.A large number of human bones from the early Dawenkou period were unearthed.Through C and N stable isotopic analysis,the food structure of the "Beiqian" ancestors was reconstructed and the influence of terrestrial and marine resources on their lifestyle was discussed.Based on the δ13C and δ15N stable isotopic values of human bone collagen,the analytical results obtained through a ternary mixed model reveal that the food sources of the Beiqian ancestors included about 44.1% marine species(probably shellfish and fish),34.1% C4 plants(possibly millet),and 21.8% land animals.These results indicate that they lived mainly from fishing and farming,supplemented by hunting or poultry raising.Compared with other sites in the same period,the stable isotope results show that 5000-6000 years ago,the lifestyles of ancestors in the Yangtze River basin,Yellow River basin,Northern coastal area and inland area were very different.The ancestors from the Yangtze River basin focused on rice farming and fishing,whereas the ancestors in the Yellow River basin farmed millet and raised animals.Those in coastal areas relied mostly on farming and marine fishing.     

加强资源共享与管理提高通信调度效率

文章首先从目前企业通信调度工作的现状出发,剖析了工作中存在的一系列问题以及背后的实质性原因,然后从适应企业和用户需求的角度出发,经过多方面的比较,提出了解决方案,即通过在现有电子运维系统中增添资源管理模块的方式,使通信调度工作成为提升企业竞争能力和服务水平、提高用户满意度和忠诚度的有力武器.最后展望了未来理想的资源管理与通信调度模式.     

FENG Guo-dong, et al

Aim To investigate a new method for synthesis of an Immobilized-Metal Affinity Chromatography(IMAC) adsorbent with superparamagnetism(Fe3O4/SiO2-GPTMS-Asp-Co).Method The magnetic microspheres were synthesized in situ modification and the transmission electron microscope,field emission scanning electron microscopy,X-ray diffractometer,energy spectrometer and vibrating sample magnetometer were used to characterize the appearance,particle size distribution,phase composition,chemical constituents and magnetic properties of silica magnetic microspheres(MMS).Results The silica MMS prepared by reverse microemulsions exhibit a superior core-shell structure.The size distribution of the microspheres varies from between 100 nm to 200 nm and the main phase of microspheres is amorphous SiO2 and spinel Fe3O4.The microspheres retain superparamagnetism and can be used as biomaterials.Conclusion The result indicates that the IMAC adsorbent we prepared has outstanding advantages in the separation of the natural products proteins from the crude bacterial lysate,such as simple operation,high selectivity and capacity.     

Neural network-based H∞ filtering for nonlinear systems with time-delays

A novel H∞ design methodology for a neural network-based nonlinear filtering scheme is addressed. Firstly, neural networks are employed to approximate the nonlinearities. Next, the nonlinear dynamic system is represented by the mode-dependent linear difference inclusion （LDI）. Finally, based on the LDI model, a neural network-based nonlinear filter （NNBNF） is developed to minimize the upper bound of H∞ gain index of the estimation error under some linear matrix inequality （LMI） constraints. Compared with the existing nonlinear filters, NNBNF is time-invariant and numerically tractable. The validity and applicability of the proposed approach are successfully demonstrated in an illustrative example.     

网络虚拟社会中非常规安全问题与社会计算方法

网络虚拟社会中的非常规安全问题已成为威胁国家安全和社会稳定的重大问题。本文论述了近年来网络虚拟社会环境的变迁,以及由此引发的网络虚拟社会中的非常规安全问题,讨论了中国政府对网络虚拟社会的认识与态度的转变。最后,回顾了2004年以来王飞跃研究团队对数字网络化社会所带来的国家与社会安全内涵改变的思考及其科学应对方法的研究历程,认为基于ACP的社会计算方法是研究网络虚拟社会中非常规安全问题的一种有效途径,未来发展与应用前景广阔。     

浅析数据加密在无线网络中的应用

随着无线技术的发展,以其安装的便利性,高带宽等方面的优势,迅速占有了大量的市场份额,并走进了千家万户。无线网络不仅成为企事业单位的必备,而且也成为家庭网络的首选。如何确保无线网络的安全,这一问题已成为当前科学研究的重点。现在已有许多确保网络安全的方法,文章着重从数据加密这一角度来探讨如何确保无线网络的安全。     

Genome-wide association study identifies loci influencing concentrations of liver enzymes in plasma

Concentrations of liver enzymes in plasma are widely used as indicators of liver disease. We carried out a genome-wide association study in 61,089 individuals, identifying 42 loci associated with concentrations of liver enzymes in plasma, of which 32 are new associations (P = 10(-8) to P = 10(-190)). We used functional genomic approaches including metabonomic profiling and gene expression analyses to identify probable candidate genes at these regions. We identified 69 candidate genes, including genes involved in biliary transport (ATP8B1 and ABCB11), glucose, carbohydrate and lipid metabolism (FADS1, FADS2, GCKR, JMJD1C, HNF1A, MLXIPL, PNPLA3, PPP1R3B, SLC2A2 and TRIB1), glycoprotein biosynthesis and cell surface glycobiology (ABO, ASGR1, FUT2, GPLD1 and ST3GAL4), inflammation and immunity (CD276, CDH6, GCKR, HNF1A, HPR, ITGA1, RORA and STAT4) and glutathione metabolism (GSTT1, GSTT2 and GGT), as well as several genes of uncertain or unknown function (including ABHD12, EFHD1, EFNA1, EPHA2, MICAL3 and ZNF827). Our results provide new insight into genetic mechanisms and pathways influencing markers of liver function.     

济贫问题的随机分配模型

对美国Columbia大学Herbert Robbins教授提出的济贫问题进行了研究,该问题要求计算每个人获得的钱数的方差．先将此问题转换为非齐次马尔可夫链模型,推导出一步转移概率矩阵,依此证明了当钱数趋于无穷大时,方差趋于零;给出了计算K=3和N=4时问题的精确解;最后给出了N,K为更大数值的Monte—Carlo模拟解,并检验了模拟解和精确解的一致性．     

基于主体的可再生能源电力消纳交易仿真研究

我国为解决"三弃"问题,提出了可再生能源电力消纳保障机制。为激励可再生能源电力消纳,采用多主体仿真方法,分析了市场主体交易行为和交互关系,剖析了影响可再生能源电力消纳的关键交互因素,针对多种影响因素变动,对可再生能源电力消纳情况和积极消纳者数量的演化进行了仿真实验。结果显示:绿证被认购能直接促进本年可再生能源电力消纳;想要加快可再生能源电力消纳需综合考虑超额消纳量价格、绿证价格和消纳量补充交易频率,使我国可再生能源健康发展。