聚乙烯醇-壳聚糖水凝胶制备与溶胀行为的研究

研究了聚乙烯醇与壳聚糖质量比、溶剂醋酸溶液体积、交联剂戊二醛浓度等对聚乙烯醇-壳聚糖水凝胶溶胀性能的影响,正交实验的结果表明当聚乙烯醇与壳聚糖质量比为2、溶剂醋酸体积为100 mL、交联剂戊二醛的浓度为0.213 mol/L时凝胶溶胀度最大.凝胶溶胀度随着聚乙烯醇与壳聚糖质量比、交联剂戊二醛浓度的增大而减小,随着溶剂醋酸溶液体积增加而增大.     

近地小行星探测转移轨道方案设计与优化

探测小行星转移轨道的设计不同于传统的飞行器轨道设计,由于需要更多的能量,仅依靠冲量轨道转移难于实现,针对此问题,以近地小行星3288 Seleucus为例,采用了先将飞行器递推至以2 a为周期的日心大椭圆轨道的远日点,加深空机动使之再次与地球相遇,进行借力飞行的轨道转移技术,设计了其转移轨道.为了进一步减少此探测任务在轨道转移方面所需的总的能量,采用了变分与主矢量原理推导出了总的速度增量对自由变量的偏导数,把复杂的多维非线性轨道优化问题归结为一个多维参数优化问题,并利用梯度下降法,对所设计的探测3288 Seleucus小行星的转移轨道方案进行了优化.数学仿真结果表明:这种地球借力飞行的轨道转移技术可有效的降低完成任务所需的总能量,特别是发射时所需的能量.     

含水层失水与岩溶塌陷引起的采动损害分析

分析采矿活动对地表损坏的原因.得出了以含水层失水与岩溶塌陷为主、开采直接影响为辅的采动损害结论.研究结论为南方岩溶发育地区开采损害预计和责任认定提供了依据.     

空间RSSR机构的几何特征及图解—数值法

文章提出了一种能快速确定空间ＲＳＳＲ机构极限位置和曲柄存在条件的图解──数值法。     

Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2

The diversities of hydrogen sorption properties of Mg₂FeH₆-based complexes with and without TiO₂ were investigated. Mg₂FeH₆-based complexes with and without TiO₂ were synthesized respectively by reactive mechanical alloying, and hydrogen sorption properties of the complexes were examined by Sieverts-type apparatus. The results show that the sample without TiO₂ releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H₂ pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H₂ pressure. But for the sample with TiO₂ addition under the same condition, it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO₂ are determined to be 71.2 and 80.3 kJ/(mol·K), respectively. The improvement in hydrogen sorption rate and and reduction in activation energy can be attributed to the addition of TiO₂.     

硅钢片填充排样计算机辅助设计

本文结合作者研制的上海电机厂硅钢片套裁计算机排样系统，阐述钢套裁填排样问题与排样系统的设计原理，介绍系统的总体设计方案并给出一生产实例的排样结果。最后对应用本系统所能产生的经济效益加以说明。     

空间RSSR机构的几何特征及图解—数值法

文章提出了一种能快速确定空间ＲＳＳＲ机构极限位置和曲柄存在条件的图解－数值法。     

营养芝麻乳的研制

以芝麻、大豆为主要原料制备的植物蛋白营养乳，克服了纯芝麻乳水溶性差的难题以及纯豆奶风味较差的缺陷。制品口感细腻、颜色洁白有光泽，组织状态均匀一致，是一种含高蛋白的天然保健饮料。     

基于Elman网络的黄河源区枯期径流预报

采用反馈Elman网络,对黄河唐乃亥水文站及上游玛曲站近45年(1959～2003年)年降雨及径流流量进行分析,建立了基于反馈神经网络的黄河源区枯季径流预报模型.利用Matlab7 神经网络工具箱对黄河源区唐乃亥水文站枯季径流量进行了预报.结果表明所建立的ANN(7,7,15,7)模型预报结果精度高,容错能力强,是枯季径流预报的有效手段.     

Spacecraft formation control strategy on Sun-Earth Lissajous orbit

To carry out the deep space exploration tasks near Sun-Earth Libration point L2, the CRTBP dynamic model was built up and the numerical conditional quasi-periodic orbit (Lissajous orbit) was computed near L2. Then, a formation controller was designed with linear matrix inequality to overcome the difficulty of parameter tuning. To meet the demands of formation accuracy and present thruster’s capability, a threshold scheme was adopted for formation control. Finally, some numerical simulations and analysis were completed to demonstrate the feasibility of the proposed control strategy.