装备保障能力薄弱环节确定方法

针对保障领域重保障能力评估而轻薄弱环节查找的现状,提出一种通过求解保障能力各指标薄弱度确定薄弱环节的方法。薄弱度由指标裕度空间和权重共同决定,采用主成分分析法求其权重,应用集对分析优化指标裕度空间。实例表明,利用该方法求出的薄弱环节改进方案与其他2种方法确定的方案相比是最优的,能提高保障资源配置合理性。     

基于集对分析的旱情综合评价模型研究

综合考虑气象干旱、水文干旱、农业干旱、社会经济干旱等情况,选取水库蓄水距平百分率、地下水埋深、土壤含水量、降水量距平百分率等作为旱情评价的指标,将旱情分为不旱、轻度干旱、中度干旱、严重干旱、特大干旱5个等级,建立了基于集对分析的旱情综合评价模型。从山东省42 a的实测资料中随机挑选7 a资料,对历史旱情进行了综合评价。结果表明:基于集对分析的旱情综合评价结果与模糊综合评价结果基本一致,且与实际情况相符,说明该方法在旱情评价方面具有合理性和可行性。     

Shadow detecting using particle swarm optimization and the Kolmogorov test

An algorithm combining both gray level information and geometric features is introduced to detect cast shadows in gray level images. A simply connected candidate shadow region and a corresponding region are segmented by setting gray level thresholds, and neighbor-matching regions are constructed with a mathematical morphological algorithm. A shadow-non-shadow region pair is obtained from the result of Kolmogorov test for statistical features of both candidate neighbor-matching regions. Shadow regions are obtained by selecting the region with relatively lower average gray level from the matched region pair. The particle swarm optimization (PSO) algorithm is used to facilitate the feature extraction during the matching process. Experimental results showed the effectiveness of the proposed algorithm for cast shadow detecting in a single gray level image.     

Some common fixed point theorems for generalized nonlinear contractive mappings

Sufficient conditions for the existence of a common fixed point for generalized nonlinear contractive mappings are derived. As applications, some results on the set of best approximation for this class of mappings are also obtained. The proved results generalize and extend various known results in the literature.     

DNA与2-磺酸蒽醌三重态相互作用生成阴、阳离子自由基对的直接检测

平面型光核酸酶激发态通过电子转移光氧化定域损伤ＤＮＡ的研究已成为当前的一个热门课题。但是,由于直接检测ＤＮＡ阳离子自由基遇到困难所以未能获得主要瞬态产物,阴、阳离子对的瞬态吸收光谱。中国科学院辐射化学开放实验室在１９７年成功获取了丙酮三重态电子转移光氧化ＤＮＡ和首次确证ＤＮＡ阳离子自由基的基础上,现用激光光解研究了２－磺酸钠蒽醌三重态对ＤＮＡ四种核革酸电子转移光氧化生成的阴、阳离子对。在与光氧化核     

可调谐半导体激光吸收光谱测温谱线选择

可调谐半导体激光吸收光谱(Tunable Diode Laser Absorption Spectroscopy,TDLAS)作为非接触光学测量手段,在燃烧诊断、推进系统研发中应用广泛,而吸收谱线对的选择是采用TDLAS技术进行燃气温度测量的基础和关键一步。在扫描波长-直接吸收法测量H_2O温度的实验中,首先系统地研究了谱线选择的基本原则和实现步骤,对选择原则中各指标的量化进行了重点分析;然后对中心频率在7000～7500 cm~(-1)范围内的水分子吸收谱线进行研究和筛选;最后结合数值模拟进行分析,选择了7022. 7091,7444. 3707 cm~(-1)和7185. 5962,7444. 3707cm~(-1)两对谱线,为TDLAS温度测量系统设计提供依据。     

碳化硅复合陶瓷耐磨性能研究

研究了常压烧结碳化硅复合陶瓷的耐磨性能及碳化硅复合陶瓷减摩性能、摩擦副优化配对等。研究结果表明,高速高压摩擦磨损试验中,碳化硅复合陶瓷与不同摩擦副材料配对,摩擦系数均小于0.2。     

一种改进的XP技术及其实践应用

极限编程(XP)是简单、快速、易用的软件开发方法中最为流行的。在简要介绍XP的概念、结对编程等基本理论之后,阐述了XP与结对编程的关系,并在此基础上,根据实际的开发环境,提出了一种改进型的结对编程方式,并将其应用于一个营业收费信息系统的开发过程中,详细描述了XP开发模式的实际执行过程及结果,通过实践改进加强了对XP的理论研究和实践理解。     

Study of steady-state photoluminescence of AgInSe2 crystals

The steady-state photoluminescence (PL) spectra of AgInSe₂ grown by the Hot-Press method have been examined. The broad peaks located at 1.19 eV and 1.16 eV are very likely to be the donor-acceptor-pair emissions. The energies of the donor levels participating in these emissions correspondingly are 25 eV and 50-52 meV, as found from the analyses of the activation energies of the PL intensity. The peaks observed in the obtained PL spectra in the band-edge region are attributed to free and bound excitons. The binding energy of the free exciton is estimated to be 29 meV.