CdSe量子点的制备与荧光特性研究

主要讨论了CdSe量子点的制备及荧光特性。CdSe量子点由化学方法制备，通过选择不同的反应时间得到不同尺度的量子点样品。用荧光方法研究了量子点样品在石英衬底和有机溶剂中的荧光特性。实验表明，这些量子点都有良好的荧光特性。还用无限深球方势阱模型分析了量子点样品的电子态，并根据荧光参数估算了量子点的尺度．各样品荧光峰具有一致的半峰宽，表明CdSe量子点的成核过程在反应开始时同时完成。     

预应力锚固技术在龙滩水电站高边坡工程中的应用

龙滩水电站进水口高边坡最大坡高达420m，为保证高边坡的稳定，采用预应力锚索技术。预应力锚索的加固作用非常明显，不仅为边坡的稳定提供了经济、有效的手段，而且为按期截流创造了条件。     

基于RBF网络和IMM的机动目标跟踪方法

文中提出了一种应用RBF神经网络对标准IMM算法中的卡尔曼滤波结果进行校正的方法。网络输人为预测误差、卡尔曼增益以及测量值与估计值之差．网络输出反映了由于目标机动所带来的滤波误差．将网络输出结果和直接由卡尔曼滤波求解得到的结果相加．可以得到更为准确的滤波值。同时．在网络的学习算法中．在网络权值矩阵的修正公式中增加了反映滤波残差的调整项．若卡尔曼滤波的残差较大，网络调整权值的幅度也相应增大。仿真结果表明．在目标发生机动转弯处．校正后的IMM算法的跟踪误差要明显小于标准IMM算法的跟踪误差．跟踪精度较高。     

级进模两步法冲裁模设计要点

从寻求发挥多工步冲裁优越性的角度出发,通过试验测试,证明了以第1工步为半冲裁、第2工步为推料的两步法冲裁,能消除自动化冲压加工中的废料上行和废料堵塞,降低冲裁工艺噪声。提出了实现两步法冲裁级进模的结构,包括两工位两工步及三工位两工步级进冲裁模的4种具体结构,并给出了其设计要点。     

Key technologies of layout design of recycling plants of waste refrigerators

The present situations of waste refrigerators recycling and disposing were analyzed. Three key technologies of layout design of recycling plants of waste refrigerators were presented as follows: 1) establishment of recycling process of waste refrigerators; 2) the general plane layout of recycling plants; 3) the detailed layout of workshops of recycling plants. The focus of the three key technologies is to tackle the problem of the detailed layout of workshops of the recycling plants. By adopting Petri net, the model of logistics system of workshops was established and then optimized, and finally the detailed layout chart of recycling plants was gained. By adopting E-factory, the recycling plants were simulated. The results show that the method mentioned is effective. Foundation item: Project(50375044) supported by the National Natural Science Foundation of China     

小溶江水利枢纽导流隧洞设计

分析了小溶江水利枢纽导流隧洞工程的工程地质和设计洪水资料,论述了设计中根据隧洞运行条件,进行水力计算、结构计算及衬砌计算和进水塔稳定分析,从而选定经济合理的设计方案.     

基于瞬态熔融理论的新型螺杆研究

通过对挤出机固体输送段物料融解过程的分析，提出了通过在螺槽中垫高固体床，将熔化的熔融物挤进螺槽内侧的熔池中，而在螺槽内侧的熔池保持高度不变，从而使物料和熔融物相对分离，以提高熔化速率以及减少熔融物降解的新型螺杆模型。     

MICROWAVE-ASSISTED EXTRACTION OF CAPSAICINOIDS FROM CAPSICUM FRUIT

The applicability of microwave irradiation to assist the extraction of capsaicinoids from capsicum fruit was investigated. The procedure involved irradiation of 2 g samples in a closed-vessel followed by gas chromatography of capsaicinoid derivatives. The optimum conditions for extraction were determined to be acetone at 30% power for 7 min irrespective of ground or whole tissue.
The yield of the compounds extracted was significantly greater (P < 0.05) using microwave-assisted extraction (MAE) compared to traditional reflux and shaken flask methods. A single extraction step was efficient in recovering approximately 95% of the total capsaicinoid fraction in 15 min compared with 2 h for the reflux and 24 h for the shaken flask methods. Due to the considerable savings in time and energy as well as reliability, this technique is suitable for fast extraction of capsaicinoids from large samples.     

千佛岩水电站泄洪建筑物水力学试验研究

工程中泄水建筑物与电站厂房之间容易出现跌水、侧收缩等问题,严重地影响了泄水建筑物的泄流量和电站的安全运行。结合具体工程,通过多种体型方案的比较,提出了在闸墩前加设圆墩头导墙的优化方案,为同类工程的设计、修建起到了一定的参考作用。     

遗传算法在双向反射分布函数模型参数优化中的应用

对以大理石为代表的材料进行了双向反射分布函数测量实验，得出了样品的半球反射率，并研究了其随入射、反射天顶角等参数变化的规律。采用遗传算法建立了金刚砂和大理石材料的双向反射分布函数的参数模型，对模型进行参数反演时，通过遗传算法进行优化。拟合后的实验数据曲线表明，利用遗传算法得到的结果具有较好的一致性。