印尼Binton岛水晶凤螺生物学与生态学的周年研究

１９９４年２月至１９９５年１月在印尼Ｒｉａｕ省Ｂｉｎｔａｎ岛进行了关于凤螺的生物学与生态学的研究。研究表明，凤螺群最密集期是８月份，集中地是低潮区；最稀少是在２月份，高潮区。凤螺属于食草类动物，主要进食是藻类、海草、浮游生物和岩屑。截自观察期结束时的统计，生长率为１．４４ｍｍ／月，存活率为１６％。凤螺体形大小约１２ｍｍ～８２ｍｍ，最大凤螺达到或大于３４ｍｍ，分布在中潮区或高潮区。相反的，各种大小的凤螺可在低潮区发现，雄性与雌性的比率为１：２，雄性体形通常大于雌性。再者，由于凤螺暴露在海岛的近海处和紧挨赤道线的水域，其所需的环境参数的主要特点是相对稳定的温度和海水盐度以及丰富的雨量。     

Simulation of Control and Guidance System for the Spinning Missile

Ｓｉｍｕｌａｔｉｏｎ　ｏｆ　Ｃｏｎｔｒｏｌ　ａｎｄ　Ｇｕｉｄａｎｃｅ　Ｓｙｓｔｅｍ　ｆｏｒ　ｔｈｅ　Ｓｐｉｎｎｉｎｇ　ＭｉｓｓｉｌｅＭｅｎｇＤａｉｋｕｉ（ＣｈｉｎａＣｈａｎｇｆｅｎｇＳｙｓｔｅｍＥｎｇｉｎｅｅｒｉｎｇＣｏｒｐｏｒａｔｉｏｎ，Ｐ．Ｏ．Ｂ...     

CuHg(SCN)_4的晶体结构

本文研究了 ＣｕＨｇ（ＳＣＮ）４的晶体结构。晶胞参数为：ａ＝９．０３,ｂ＝７．６８,ｃ＝１５．１５Ａ;晶体的空间群为Ｄ１４２ｈ－Ｐｂｃｎ。 结构是通过Ｐａｔｔｅｒｓｏｎ函数投影和电子密度投影来测定的;碳原子和氮原子的坐标则通过相差合成和三维电子密度加以修正。研究结果得出：晶体结构是三维骨架型的;Ｃｕ原子由 ４个 Ｎ原子和 ２个Ｓ原子组成扭曲八面体配位; Ｈｇ原子的邻近 ６个Ｓ原子形成了“不正常” 的构型;两类金属原子彼此通过硫睛根联系起来。     

一种新型的瓷-铝复合太阳能板

研发了一种新型高效的瓷-铝复合太阳能板,由铝合金基体板、导流汇集管和纳米结构吸热涂层等组成。铝合金基体板为循环管与曲翅板集成化一体结构,采用6063耐蚀铝合金通过型材挤出机一次挤制成型;循环管和导流汇集管内壁涂覆厌水涂层,防止管道吸附水垢,增强耐蚀性能;将黑瓷粉、消光剂和树脂结合剂等原料粉末合成纳米黑瓷复合粉料,通过静电喷涂和高温固化工艺制成纳米结构吸热涂层,阳光吸收率高达0.96。实验结果表明,纳米结构吸热涂层热稳定性好,阳光长期照射下不会导致吸热涂层剥落;集成化结构的瓷-铝复合太阳能板导热性能优良,导热效率高达0.98;瓷-铝复合太阳能集热器的热效率约为43.6%,高于传统的太阳能集热器,制造成本比传统太阳能集热器平均低约14%。瓷-铝复合太阳能集热器在成本、寿命和效率方面更具优势,可用于建造大面积太阳能集热系统,能够满足当前太阳能产业发展的需要,具有良好的经济和社会效益,推广应用前景广阔。     

Flooding attack and defence in Ad hoc networks

1 .INTRODUCTIONMobile Ad hoc Network is an autonomous system ofmobile nodes connected by wirelesslinks .It has sever-al salient characteristics ,such as Dynamic topologies ,Bandwidth-constrained,variable capacity links , Ener-gy-constrained operation,Li mited physical security[1].Due tothesefeatures ,mobile ad hoc networks are par-ticularly vulnerable to denial of service attackslaunchedthrough compromised node.In this paper , we present a new attack,theAd hoc Flooding Attack, which re…     

A Mathematical Model of Real-Time Simulation and the Convergence Analysis on Real-Time Runge-Kutta Algorithms

In this paper, a mathematical model of real-time simulation is given, and the problem of convergence on real-time Runge-Kutta algorithms is analysed. At last a theorem on the relation between the order of compensation and the convergent order of real-time algorithm is proved.     

ANALYSIS OF INCOMPLETE STOCK MARKET WITH JUMP-DIFFUSION UNCERTAINTY

This paper studies incomplete stock market that includes discontinuous price processes. The discontinuity is modeled by very general point processes admitting only stochastic intensities. Prices are driven by jump-diffusion uncertainty and have random but predictable jumps. The space of risk-neutral measures that are associated with the market is identified and related to fictitious completions. The construction of replicating portfolios is discussed, and convex duality methods are used to prove existence of optimal consumption and investment policies for a problem of utility maximization.     

A New RCS Statistical Model of Radar Target

In this paper, the drawbacks of conventional target fluctuation models used in radar target modeling are set out. It is usually difficult to statistically model a real target because there are very few parameters which can be used to approximate the probability density function (PDF) of a real target's radar cross section (RCS) in conventional target models. A new method of statistical modeling is suggested, according to which the first nth central moment of real target's RCS, combined with the Legendre orthogonal polynomials, is used to reconstruct the PDF of the target's RCS. The relationship between the coefficients of the Legendre polynomials and the central moments of RCS are deduced mathematically. Through a practical computing example, the error-of-fit is shown as a function of the orders of Legendre coefficients. By comparing the errors-of-fit caused by both the new model and the conventional models, it is concluded that the new nonparametric method for statistical modeling of radar targets is s     

Project Systems Engineering for Developing Space Robots

Space robots possess unique distinguishing features unlike general robots on earth, due to the particular environments in space. The developing of various practical space robots promoting the improvement of space science and technology is a complex man-machine-environment engineering problem. This paper analyses from the systems engineering viewpoint the space robot system in the scope of the architecture of robotics discipline, space environment characteristics, man-machine-environment system of space robots, the general methodology of project systems engineering and the process of space robot systems engineering.     

毛主席语录

<正>我们一定要努力把党内党外、国内国外的一切积极的因素,直接的、间接的积极因素,全部调动起来,把我国建设成为一个强大的社会主义国家。有句古语,“纲举目张”。拿起纲,目才能张,纲就是主题。社会主义和资本主义的矛盾,并且逐步解决这个矛