如何在基础无机化学实验课中培养本科生的科研思维——以实验“[Co(NH3)6]Cl3的制备”的改革为例

针对基础无机化学实验教学中学生理论联系实际能力不足、对实验课不够重视以及实验课教学效果难以达到预期等问题,本文以[Co(NH_3)_6]Cl_3的制备为教学案例,通过预设问题促进学生积极思考,达到深刻理解实验内容的目的。通过新旧教学法的对比,提出在无机化学实验教学中,以"问题设置法"进行本科生科学思维培养的改革方案。     

Multispectral Plasmon of Anisotropic Core-shell Gold Nanorods@SiO2: Dual-band Absorption Enhancement with Coupling Dye Molecules

Direct evidence of effects of surface plasmon resonance(SPR) of gold nanorods(GNRs) on dual-band light absorption enhancement with coupling dye molecules was reported by introducing gold nanorod@SiO₂(GNR@SiO₂) core-shell nanoparticles into a photoelectric conversion system. GNR with asymmetric shape had unusual anisotropic SPR[transversal surface plasmon resonance(TSPR) and longitudinal surface plasmon resonance(LSPR)]. The excellent SPR of GNR made it a promising candidate as enhancing light absorption material to increase power conversion efficiency(PCE). The PCE was improved nearly 17.2% upon incorporating GNRs, mostly due to the increase in J_sc, while V_oc and FF were unchanged. The improvement was mostly contributed by the SPR of the GNRs with coupling of N719. And there was also a complementary to N719 in visible light range. Therefore, SPR is an effective tool in improving the photocurrent and consequently enhancement of PCE. The TSPR and LSPR effects of GNRs on light harvesting were reflected in the increased monochromatic incident photon-to-electron conversion efficiency(IPCE). We also utilized finite-difference time-domain(FDTD) to investigate the light coupling of GNRs with TiO₂. Compare to the base anode, the IPCE of optimized electrode showed significant improvement and peaks broadening at 500-600 nm and 610-710 nm. We got an increase in overall conversion efficiency from 6.4% to 7.5%.     

舰载火控雷达动态抗干扰策略规划研究

舰载火控雷达作为信息系统与武器交联的关键一环,亟需提升自身的抗干扰能力,以保证雷达在复杂电磁环境下的作战效能.针对这一问题,本文提出一种基于多判决网络的抗干扰策略优化方法,能够根据环境信号电磁频谱分布,合理分配雷达资源,快速作出响应决策.通过外场试验,验证了所提方法的有效性.     

二邻巯基苯酚-苯甲酰肼合钼(Ⅳ)酸双三乙基亚铵三元固态配合物的合成及谱学特性

以(Bu₄N)₄Mo₈O₂₆为原料,以邻巯基苯酚和苯甲酰肼为配体,在甲醇中合成了未见报道的单核三元配合物二邻巯基苯酚-苯甲酰肼合钼(Ⅳ)酸双三乙基亚铵.通过元素分析、红外光谱、¹H NMR谱、电子光谱、差热-热重分析对化合物的性质进行了表征,发现它是无端基氧钼配合物,并提出了其可能结构.     

A Study on the Finite Difference Approach of the Surface Laplacian

The surface Laplacian of bioelectrical activity was first applied to the Electroencephalogram (EEG) by Hjorth[1]. In the field of ECG, the body surface Laplacian mapping was also developed to provide better spatial resolution than the body surface potential distribution[2]. There are generally two kinds of estimation of surface Laplacian: local methods and global methods. The former calculate the difference of potentials recorded from neighboring electrodes[1]. The latter are based on the…     

逆层析彩虹全息光路参数与色差分析

本文应用横向面积分割和非相干多次曝光相结合的方法在一幅合成彩虹全息图上记录 10～ 6 0片CT平面断层图象 ,并提出了各层再现像亮度均匀、颜色相近的光路设计方法。本文还对白光再现像的色差进行了讨论。     

不变区域提取算法及其在两视图粗校正中的应用

在宽基线成像过程中,两视图的成像角度、光照条件都发生较大的变化,使得立体匹配的难度加大。提出了一种基于不变区域提取算法,通过灰度指数变换,定义的目标函数不仅提取了定位准确的极值点,形成稳定的不变区域,而且突显了每个方向上灰度的变化。将其应用于两视图RTS变化参数估算中,正确率分别达到:旋转91.65%,水平位移84.85%,垂直位移80%,比例84.29%。根据估算值对右图像进行校正,校正后的右图像明显地提高了与左图像的相似度。     

基于Petri网的工作流过程建模

工作流是对一组有关联的工作任务间的依赖关系进行的形式化描述。通过对目前流行的一些工作流产品的分析,针对现有工作流模型表达能力差,缺乏严格的形式化数学定义以及没有科学分析手段的缺点,引入有色Petri网的相关理论,建立一个工作流逻辑网以实现工作流的过程建模,该模型有严格的理论基础,并可以利用成熟的Petri网分析方法对业务流程进行分析,同时还具有一定的灵活性和可扩展性。     

ASON技术特点及其在下一代光网络中的角色探讨

回顾了ASON技术特点及其进展情况，述了ASON技术在下一代光网络中担任的角色；智能网络中的地位和应用方式。讨论了ASON的关键技术和优势；然后，详细阐最后，比较系统地描述了ASON技术在下一代光