改进的基于二阶互信息的配准技术

着重分析讨论了灰度级别、邻域信息对基于二阶互信息的配准技术的影响,通过实验分析得到在PV插值基础上最佳的灰度级别、邻域信息,从而改进了基于二阶互信息的配准技术,并借助分析噪声对配准的影响来解释相关结论。     

单模光纤相移三维轮廓测量术基于对功率谱进行位相调制的联合变换相关器

提出了一种新的计算机图像处理光栅投影三维轮廓测量系统,该系统用一分二单模光纤耦合器产生正弦光强分布的投影光栅场;将光纤一臂绕在压电陶瓷(PZT)环引入相移。将该系统用于实际测量得到了满意的效果。该系统具有结构简单、体积小、重量轻、光栅条纹清晰并且光强正弦分布等优点,有很高的实用价值。讨论了通过位相调制对多灰度图像进行功率谱相减的原理,并提出了利用此原理实现多灰度多目标光学联合变换相关的新的实验方法。其中需对功率谱进行两次记录并进行相减。在第二次的记录过程中,利用位相板使参考图像产生半波位相延迟。将相减后的功率谱进行傅里叶逆变换,能够使相关峰得到明显增强,而且大大抑制了多目标间的相关及背景噪声间的相关。此方法特别适用于具有多灰度背景噪声的多灰度的多目标识别,而且方法简单,易于实现。     

混凝土受不同浓度水平硫酸盐侵蚀劣化机理试验研究

本文通过微观和宏观观测综合揭示了干湿循环作用下混凝土受不同浓度水平硫酸盐侵蚀的劣化规律,微观观测包括用热分析方法进行侵蚀产物分析和用改进硫酸钡重量法（化学滴定法）测量由表及里不同深度处硫酸根含量,宏观观测主要包括抗压强度、劈裂抗拉强度等基本力学性能。干湿循环作用下,湿状态下混凝土受到钙矾石、石膏等膨胀性侵蚀产物的作用,干状态下又叠加Na2SO4.10H2O结晶压力的损伤。当侵蚀溶液浓度比较高时,湿状态下硫酸根更容易扩散进入混凝土内部,干状态下生成的Na2SO4.10H2O晶体数量多,导致混凝土受侵层厚度比较大,表现为宏观上的强度劣化程度就严重。研究成果可为进行干湿循环作用下混凝土硫酸盐侵蚀的评估和预防提供依据。     

燕麦麸对糖尿病小鼠血糖、血脂及脏器官功能的影响研究

研究燕麦麸对链尿佐菌素糖尿病小鼠的降糖作用,以小鼠普通饲料作为基础饲料,添加不同含量的燕麦麸制作成配方饲料喂养链尿佐菌素糖尿病小鼠,通过观测其主要指标血糖,及次要指标体重、血清中甘油三酯、总胆固醇、高密度脂蛋白、低密度脂蛋白等,获得相关数据。研究结果表明:不同浓度燕麦麸能显著(p0.01)降低患病小鼠血糖水平,缓解患病鼠尿多,体重下降的病状,同时燕麦麸还能有效抑制因糖尿病导致的高血脂等糖尿病并发症,增强患病小鼠脏器胰脏器官功能。     

受盐层影响的前陆褶皱-冲断带构造特征——以库车秋立塔克构造带为例

褶皱-冲断带和盐相关构造均十分发育的秋立塔克地区构造极其复杂,该地区新生界内部存在两套起滑脱层作用的膏盐层.受滑脱层位置变化影响,垂向上和平面上的构造变形特征均具有很大差别.地震剖面识别出的构造样式主要有盐焊接、断层滑脱褶皱、断层传播褶皱、断层转折褶皱、三角带及其混生构造样式和基底卷入型断层相关褶皱等.秋立塔克地区盐相关构造形成的主要动力是挤压应力,其形成过程主要经历了楔状地层、滑脱背斜、滑脱断层和对冲断裂形成4个阶段.     

油液污染度分析在船用舵桨装置状态监测中的应用

应用污染度检测仪对2条港口作业拖船的舵浆装置润滑油进行了污染度检测,通过对所测污染度数据的分析并辅以油液光谱分析和铁谱分析,对船用舵桨装置运动副的磨损状态及发展趋势进行了评价和预测。指出油液污染度分析不仅可对机械设备的磨损状态进行监测、评价和趋势预报,而且简单方便可行,是设备状态监测与故障诊断的一种重要技术手段。     

Goal orientations and performance: Differential relationships across levels of analysis and as a function of task demands.

Goal orientation and self-regulation theories were integrated to develop a multilevel framework aimed at addressing controversies regarding the magnitude and direction of goal orientation effects on performance. In Study 1, goal orientations were measured repeatedly whilst individuals performed an air traffic control task. In Study 2, goal orientations and exam performance were measured across 3 time points while undergraduates completed a course. Mastery-approach orientation was positively related to performance at the intraindividual level, but not at the interindividual level, and its effect was not moderated by task demands. Performance-approach positively predicted performance at the interindividual level, and at the intraindividual level, the direction of its effect switched as a function of task demands. Performance-avoid negatively predicted performance at the interindividual level but did not emerge as an intraindividual predictor. Mastery-avoid did not relate to performance at either level of analysis. This consistent pattern across 2 studies suggests that levels of analysis and task demands can determine the magnitude and direction of goal orientation effects on performance and highlights avenues for theory development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

无人作战飞机系统的辅助决策等级实验研究

无人作战飞机的辅助决策系统包括两部分：任务规划与控制站为操作者呈现清晰明确的任务界面和操作提示;机载智能体的变权限任务管理策略为操作者和无人机动态分配任务和功能,这些辅助都基于人与自动化的交互关系,分为召唤、建议和否决多个辅助决策等级。为了定量评测各级辅助决策方式的效用和辅助不可靠的负面影响,设计开发了等级实验。通过比较操作者手动和三种辅助操作方式的反应时间和正确率,得到了三种辅助决策等级的效用基本相等,辅助可靠性超过35%时就可以采用等实验结论,结论可以用来指导无人作战飞机辅助决策系统的设计。     

Luminescence properties of Sn2P2Se6 crystals

A large family of Sn_2yPb_2(1−y)P₂S_6xSe_6(1−x) semiconductor-ferroelectric crystals were obtained by the Bridgman technique. The photoluminescence properties of the Sn_2yPb_2(1−y)P₂S_6xSe_6(1−x) family crystals strongly depend on their chemical composition, excitation energy and temperature. The influence of the Pb → Sn and S → Se isovalent substitutions on the luminescence properties of a crystal with the Sn₂P₂Se₆ basic composition was investigated. A broad emission band observed in the Sn₂P₂Se₆ crystal with a maximum roughly at 600 nm (at T = 8.6 K) was assigned to a band-to-band electron-hole recombination, whereas broad emission bands, peaked near 785 nm (at T = 8.6 K) and 1025 nm (at T = 44 K) were assigned to an electron-hole recombination from defect levels localised within the bandgap. Possible types of recombination defect centres and specific mechanisms of luminescence in the Sn₂P₂Se₆ semiconductor-ferroelectric crystals were considered and discussed on the basis of the obtained results and the referenced data.     

短波HgCdTe光电二极管中缺陷能级对器件性能的影响

利用变频导纳谱研究了Ｈｇ１－ｘＣｄｘＴｅ（ｘ＝０．６）ｎ＾＋－ｏｎ－ｐ结中的深能级缺陷,得到其缺陷能级位置在价带上０．１５ｅＶ,同时给出了其俘获截面和缺陷密度,初步认为是Ｈｇ空位或与其相关的复合缺陷。根据深能级的有关参数,估算了器件的少子寿命和器件优值参数Ｒ０Ａ。