基于文献计量学的刨花润楠研究现状和发展趋势

本研究通过文献计量学总结了刨花润楠(Machilus pauhoi)的科技论文数量、发表时间、主要研究内容、发表期刊的分布特点以及从事刨花润楠研究的科研机构等,揭示刨花润楠的研究现状和发展趋势,为刨花润楠多层次、深层次研究提供方向性参考。     

A FeNiMnC alloy with strain glass transition

Recent experimental and theoretical investigations suggested that doping sufficient point defects into a normal ferroelastic/martensitic alloy systems could lead to a frozen disordered state of local lattice strains(nanomartensite domains), thereby suppressing the long-range strain-ordering martensitic transition. In this study, we attempt to explore the possibility of developing novel ferrous Elinvar alloys by replacing nickel with carbon and manganese as dopant species. A nominal Fe_(89)Ni_5Mn_(4.6)C_(1.4) alloy was prepared by argon arc melting, and XRD, DSC, DMA and TEM techniques were employed to characterize the strain glass transition signatures, such as invariance in average structure, frequency dispersion in dynamic mechanical properties(storage modulus and internal friction) and the formation of nanosized strain domains. It is indicated that doping of Ni, Mn and C suppresses γ→α long-range strain-ordering martensitic transformation in Fe_(89)Ni_5Mn_(4.6)C_(1.4) alloy, generating randomly distributed nanosized domains by strain glass transition.     

傣文信息技术研究进展

本文介绍了20世纪90年代以来傣文(含德宏傣文和西双版纳傣文)信息处理技术的发展,涉及傣文编码字符集、傣文字型、傣文键盘布局等基础标准的制订和傣文电子出版系统、傣文网站、傣文移动客户端、傣文识别系统、傣文分词系统、傣文语料库、傣文电子词典、傣文机器翻译等应用系统的开发。     

Multi-Objective Cooperative Salvo Attack Against Group Target

This paper proposes a solution for the problem of cooperative salvo attack of multiple cruise missiles against targets in a group. Synchronization of the arrival time of missiles to hit their common target, minimizing the time consumption of attack and maximizing the expected damage to group targets are taken into consideration simultaneously. These operational objectives result in a hierarchical mixed-variable optimization problem which includes two types of subproblems, namely the multi-objective missile-target assignment(MOMTA) problem at the upper level and the time-optimal coordinated path planning(TOCPP) problems at the lower level. In order to solve the challenging problem, a recently proposed coordinated path planning method is employed to solve the TOCPP problems to achieve the soonest salvo attack against each target. With the aim of finding a more competent solver for MOMTA, three state-of-the-art multi-objective optimization methods(MOMs),namely NSGA-II, MOEA/D and DMOEA-εC, are adopted. Finally, a typical example is used to demonstrate the advantage of the proposed method. A simple rule-based method is also employed for comparison. Comparative results show that DMOEA-εC is the best choice among the three MOMs for solving the MOMTA problem. The combination of DMOEA-εC for MOMTA and the coordinated path planning method for TOCPP can generate obviously better salvo attack schemes than the rule-based method.     

Synthesizing and editing dynamic flames with color temperature

Generating computer animated flames is a difficult and computationally expensive problem. Dynamic textures provide an effective means for extrapolating and synthesizing dynamic flames, but aggravates color distortion due to the high correlation of RGB components. A novel method for dynamic flame texture synthesis using color temperature is proposed in this paper. Firstly, the colortemperature mapping is calculated by using the Planck’s law and two-color pyrometric technique to avoid color distortion. Secondly, a novel dynamic texture model is presented to transform the RGB space into temperature space. Finally,the dynamic flames editing is presented to support physical temperature adjustment. Experimental results illustrate that our approach is effective to synthesize visually plausible dynamic flames without color distortions and to edit dynamic flames with intuitive physical interpretation.     

高速列车等效通过时间预测

建立了300～380 km·h~(-1)运行高速列车等效通过时间预测模型,并编制了计算程序.基于高速列车车外噪声试验和声源分析,在理想偶极子声源声传递关系基础上考虑指向性修正、多声源模型和时间延迟效应,结合京沪铁路噪声测试数据优化预测模型,预测结果与实测值在不同速度和不同距离下都有很好的一致性.高速列车等效通过时间系数随速度的增大逐渐增加,在近点与远点位置呈现不同的变化规律,以往认为等效通过时间在近点位置等于l/v的结论在高速下已不成立.     

渗流作用下柱状节理岩体强度特性试验

为研究白鹤滩水电站柱状节理玄武岩在高渗透压力作用下的强度特性,采用与水电站现场岩体物理力学性质相近的人工材料,制作具有相同节理构造的柱状节理岩体模型试样,开展了不同渗透压力的渗流应力耦合三轴力学试验,分析了渗透压力对柱状节理岩体的破坏模式、强度和渗流量的影响。试验结果表明:渗流作用下柱状节理岩体的破坏模式为沿着节理倾角的滑移破坏;渗流作用下的柱状节理岩体具有较低的强度,三轴压缩峰值强度与渗透压力呈负相关关系;应力应变曲线可分为4个阶段,渗流量随应力应变曲线呈现出阶段性特征,渗透压力对岩体强度和渗流量影响较明显。     

第27届男篮亚锦赛中国队与对手攻防能力对比分析

采用文献资料法、录像观察法、数理统计法、RSR 综合分析法等方法,对第27届亚洲男子篮球锦标赛的15支参赛球队的整体攻防实力进行 RSR 综合评价,对中国队与9支赛队及其中3强队（击败中国队的伊朗队、韩国队、中华台北队）的攻防能力进行比较分析。结果表明：伊朗队、韩国队、中国队攻防隶属 A 级水平球队;菲律宾队、中华台北队、卡塔尔队、约旦队属 B 级球队;哈萨克斯坦队、巴林队、日本队属于 C 级球队;印度队、沙特队、泰国队属 D级球队;中国香港队和马来西亚队攻防实力最弱,属 E 级球队;中国队攻防较为平衡,但攻略强于防。除罚球命中率外,中国队其它进攻指标均高于9支赛队,且两分球命中率与赛队存在显著性差异;中国队的投篮命中率低于3强队,且总投篮命中率、3分球命中率与3强队存在显著性差异;抢断、盖帽均低于对手,但犯规高于3强队。因此,中国队应提高高速度、强力量对抗中进攻的质量,注重外线队员远投训练,强化拼抢篮板球的意识和技术。     

双柔性杆机器人力／位置控制的动力学建模

在研究“刚－柔”双连杆受限柔性机器人模型的基础上,通过理论推导建立了力／位置控制问题中的一类平面双柔性杆受限柔性机器人臂的动力学模型,该模型同一般刚性机器人的动力学模型相似,且模型简明、准确。这样有可能利用一般刚性机器人的理论研究结果来研究复杂的平面双柔性杆柔性机器人臂问题。为进一步研究受限柔性机器人力／位置控制问题提供了理论依据。     

Construction and characterization of a bacterial artificial chromosome library of rice 5460F

Thermo-sensitive genie male sterile (TGMS) rice has a number of desirable characteristics for hybrid rice production. Many studies have demonstrated that the sterility of TGMS rice is controlled by a single recessive gene. It has been mapped for the first time on chromosome 8 and namedtms 1. Several AFLP markers which tightly linked to thetms 1 gene have been identified recently. In order to develop a detailed physical map of thetms1 gene-encompassing region and finally clone thetms1 gene, a bacterial artificial chromosome (BAC) library of rice 5460F (the fertile mutant line of TGMS rice 5460S) using a modified vector pECBAC1 has been constructed. The constructed 5460F BAC library consists of 16 896 clones with an average insert size of 119 kb, which represents about 4.7 times rice haploid genome equivalents. Neither chloroplast nor mitochondrial DNA was detected from the library. The library was screened with three single copy sequence amplified fragment length polymorphism (AFLP) markers which tightly linked totms1 gene as probes and eight positive clones were identified.