海底悬空管道弹性约束静态分析

由于海浪的冲刷,海底管道会出现悬空段,当悬空段较长时,管道在波浪及海流的作用下将会发生破坏。对海底悬空管道所受的环境载荷进行了计算,把海底土壤对管道的约束视为弹性约束,推导出了弹性约束时的系数矩阵,建立了相应的有限元分析模型,并开发了相应的计算机软件。该软件不仅可以计算立管与水平管连接处悬空管段的强度,还能计算静强度下的临界悬空长度。将弹性约束与刚性约束时的计算结果进行了对比,结果表明,当海底地层较硬时,弹性约束与固定端约束的计算值相差不大;当地层较软时,弹性约束时管道中的最大应力比固定端约束的要大,而临界悬空长度相差不多。     

CnP2＋（n=1～7）团簇结构与能量的密度泛函研究

使用分子图形软件设计出多种CnP2^ (n=1～7)的结构模型，并进行B3LYP密度泛函几何构型优化和振动频率计算、通过总能量的比较．最稳定的构型是具有D∞h对称性的线性结构．当n为奇数时团簇具有类似的聚炔结构性质，而n为偶数的团簇具有类似的累积二烯烃结构性质．电离能曲线具有明显地奇偶变化的规律，说明了n为奇数的团簇分子比n为偶数团簇稳定．这与激光质谱图的奇强偶弱的实验结果相符合．     

LD端面泵浦固体激光谐振腔的研究

为了对激光谐振腔体进行优化设计，采用ABCD光学传输矩阵理论．计算得到具有普适性的三镜折叠腔内高斯模式束腰的解析解．对一典型平-平热透镜腔进行计算分析，结果表明；在针对其进行优化设计的泵浦范围内．腔体稳定性很好．激光光斑半径基本不随泵浦功率变化而波动．实验中以808nm尾纤输出的激光二极管端面泵浦Nd：YAG晶体产生连续1064nm激光．激光输出结果与理论模型值能够较好地相符．     

对空警戒网有效探测范围的计算方法

给出了空警戒网对不同高度、不同反射面目标有效探测范围的计算方法,可应用于对空警戒网有效探测范围的评估.     

Dispatch Liquidity Theory in a Deregulated Environment

Power system security and reliability are more complex issues in a deregulated environment.Various criteria have been considered for power system reliability. In the day-ahead market, a successful trade schedule should be able to accept various disturbances with sufficient flexibility to be adjusted during the re-dispatch process. This paper describes the dispatch liquidity theory and some liquidity indices. The liquidity indices evaluate the effective operating reserves with the network constraints taken into consideration. A model is presented to calculate the liquidity index. An extended trade scheduling model with minimum liquidity index constraints is presented that considers the distribution requirements of the operating reserves. The liquidity indices could also be used to coordinate the security and reliability between multistage markets and for contingency selection. The algorithms were tested with real power system data. The results show that the dispatch liquidity theory is reasonable and the algorithms are effective.     

数值学报（2003年第12卷）

本书是由英国剑桥大学出版、发行的不定期专题论文集，每年出版一卷，登载数值分析、计算方法及其应用等方面的高水平创造性研究论文或综述报告，论文作者多为当代相关领域的国际性学术带头人。     

理论和实验DNA计算

本书是《自然计算系列》丛书之一。近10年来，DNA计算迅速地发展成为计算科学、生物学、工程和数学之间的新研究领域。此书全面地介绍DNA计算的整个领域、历史和发展，书中详细论述至今已有的所有理论模型和实验结果，也讨论了将来可能的发展。     

H4氢原子团簇结构与能量的计算

作者为了探索撤去高压后金属氢是否仍可能存在,将H4原子团簇正四面体空心结构的核外电子等效为类Be原子的1s态,选用两个变量波函数的变分公式,用Matlab数值分析,法计算出了它的最低能量值为-29.1275586e0(e0为e2/a0,e电子电量,a0为氢原子的第一玻尔半径),同MACQM的计算值比较,相对误差较小,研究结果说明,由作者提出的物理模型和计算方法是有效可靠的.     

Genetic Algorithms to the Nesting Problem in the Leather Manufacturing Industry

The nesting problem in the leather manufacturing is the problem of placing a set of irregularly shaped pieces (called stencils) on a set of irregularly shaped surfaces (called leathers sheets). This paper presents a novel and promising processing approach. After the profile of leather sheets and stencils is obtained with digitizer, the discretization makes the processing independent of the specific geometrical information. The constraints of profile are regarded thoroughly. A heuristic bottom-left placement strategy is employed to sequentially locate stencils on sheets. The optimal placement sequence and rotation are deterimined by genetic algorithms (GA). A natural concise encoding method is developed to satisfy all the possible requirements of the leather nesting problem. The experimental results show that the proposed algorithm can not only be applied to the normal two-dimensional nesting problem, but also especially suitable for the placement of multiple twodimensional irregular stencils on multiple two-dimensional irregular sheets.     

双流道叶轮内部三维定常湍流数值模拟

对某双吸离心泵的双流道叶轮内部的定常三维湍流进行了全流道数值模拟以研究其内部流动规律。计算基于Reynolds时均Navier-Stokes方程,采用了标准k-ε湍流模型,压力速度耦合使用SIMPLE算法。计算得到了叶轮进口和水平截面的速度矢量图、叶片压力面和吸力面以及叶轮盖板的压力分布等值线图,并对其进行了分析。结果表明全流道计算可以较好地模拟双流道叶轮的内部流动,尤其是叶轮进出口的流动,并可对泵的外特性做出预估。计算结果有助于深入了解双流道叶轮内部流动机理,指导叶轮的水力设计。