反舰导弹多目标识别技术探讨

应用模糊分类判决原理 ,探讨了反舰导弹末制导雷达同时捕获多个目标时如何优先选择主要目标进行攻击的问题 .进行了多目标分类判别以及主要目标识别的理论分析 ,并建立了相应的数学模型 .其方法可为反舰导弹末段对主要目标和装订目标的识别方案设计提供参考     

Micromorphology analysis of TiO2 thin films by atomic force microscopy images: The influence of postannealing

This work describes an analysis of titanium dioxide (TiO₂) thin films prepared on silicon substrates by direct current (DC) planar magnetron sputtering system in O₂/Ar atmosphere in correlation with three‐dimensional (3D) surface characterization using atomic force microscopy (AFM). The samples were grown at temperatures 200, 300, and 400°C on silicon substrate using the same deposition time (30 min) and were distributed into four groups: Group I (as‐deposited samples), Group II (samples annealed at 200°C), Group III (samples annealed at 300°C), and Group IV (samples annealed at 400°C). AFM images with a size of 0.95 μm × 0.95 μm were recorded with a scanning resolution of 256 × 256 pixels. Stereometric analysis was carried out on the basis of AFM data, and the surface topography was described according to ISO 25178‐2:2012 and American Society of Mechanical Engineers (ASME) B46.1‐2009 standards. The maximum and minimum root mean square roughnesses were observed in surfaces of Group II (Sq = 7.96 ± 0.1 nm) and Group IV (Sq = 3.87 ± 0.1 nm), respectively.     

基于量子行为的微粒群优化算法的数据聚类

在PSO聚类算法的基础上,提出了基于量子行为的微粒群优化算法(QPSO)的数据聚类.QPSO算法不仅参数个数少、随机性强,并且能覆盖所有解空间,保证算法的全局收敛.PSO与QPSO算法的不同在于聚类中心的进化上,实验中用到四个数据集比较的结果,证明了QPSO优于PSO聚类方法.在聚类过程中使用了一种新的度量代替Euclidean标准,实验证明了新的度量方法比Euclidean标准更具有健壮性,聚类的结果更精确.     

天然气组分及其碳同位素扩散分馏作用模拟实验研究

为了探讨扩散引起的天然气组分及其碳同位素的分馏效应与岩石物性之间的关系,建立了相应的扩散分馏作用地质模式。通过自行设计的天然气成藏物理模拟仪,选择了不同物性的岩芯及其组合进行了天然气组分及其碳同位素扩散分馏作用模拟实验。实验研究结果表明:岩石的孔隙度和渗透率越低,扩散运移引起的分馏效应越明显;乙烷以上的重烃碳同位素几乎不发生分馏作用,但其组分组成仍存在一定程度的分馏现象。利用天然气组分及其碳同位素的上述变化规律,可以追踪天然气的运移路径,也可用于气源对比研究。     

北京市农业节水与作物种植结构调整

从农业供水资源对作物种植结构的影响、作物种植结构对农业用水量和农业水资源供需平衡的影响,以及作物种植结构对农业节水灌溉方式的要求和对灌溉效益的影响等几方面研究探讨了农业节水与作物种植结构这种既相互制约,又相互促进的关系,并就北京市作物种植结构调整和今后农业节水灌溉工程建设提出几点建议.     

小麦粉破损淀粉含量对面团发酵性能的影响

以中、高筋小麦粉为研究对象,分析破损淀粉含量对面团流变发酵特性和馒头品质的影响。结果表明,随着破损淀粉含量增加,面团流变发酵性能、馒头比容、亮度及感官评分均先上升后降低;中、高筋小麦粉破损淀粉含量分别为25.11,25.60时,面团发酵高度、总产气量和持气率最大;制作的馒头比容、亮度大,感官评分最高,外形挺立、表面光滑、内部结构均匀细密、口感好。因此,中、高筋小麦粉破损淀粉含量分别为21.65~25.11,23.56~25.60时,馒头品质较好。     

The effects of tumbling and sodium tripolyphosphate on the proteins of döner

This study was designed to investigate the influence of tumbling and sodium tripolyphosphate (STPP) with marination on the protein structure of raw and cooked döner, a traditional Middle East product consumed widely in many areas of the world. Proximate composition (%moisture, %protein, %fat, %ash, and pH value), salt soluble protein (SSP) and total α-amino grup amount were determined. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) was used to investigate alterations in the sarcoplasmic and myofibrillar proteins. Utilization of STPP increased the moisture content and ash contents, and pH value of raw döner (p < 0.05). Only tumbling and STPP had a significant two-way interaction for moisture content, SSP and total α-amino group amounts of cooked döner (p < 0.05). None of the treatments significantly affected the fraction of sarcoplasmic and myofibrillar proteins. In addition, cooking caused proteolysis of these proteins.     

阳离子型絮凝剂片段在高岭石表面的吸附机理研究[1]

采用密度泛函理论(DFT)研究了3种不同结构的阳离子聚丙烯酰胺片段（EA,EMA,EAA）在高岭石表面的吸附机理。通过Mulliken布局分析、电子密度差以及吸附原子态密度对吸附体系的成键性质和相互作用类型进行了分析。结果表明,三种阳离子聚丙烯酰胺片段在高岭石（00-1）Si-O端面吸附能均要大于其在高岭石（001）Al-O端面的吸附能,主要吸附在高岭石（00-1）Si-O端面,三种阳离子聚丙烯酰胺片段在高岭石表面的能大小顺序为EA＞EAA＞EMA,经过Mulliken电荷和态密度分析,三种阳离子聚丙烯酰胺片段在高岭石（00-1）Si-O端面吸附主要为氢键。     

某铅锌矿井下采空区稳定性分析及处理措施研究

以某铅锌矿井下采空区为研究背景,建立了采空区与围岩的三维模型,通过理论分析与数值模拟方法,分析了采空区周边围岩的变形与应力分布情况,得到了采空区周边围岩的竖向位移与应力集中分布特征及塑性损伤特征,并提出了相应的空区处理措施,为矿山未来采空区稳定性评估与处理提供了参考。