6000系铝合金晶间腐蚀研究进展

介绍了与晶界直接相关的铝合金腐蚀类型,概述了合金元素和稀土元素对6000系铝合金晶间腐蚀的影响,重点介绍了热处理条件对6000系铝合金晶间腐蚀敏感性的影响．大量实验显示,热处理影响腐蚀模式,且晶间腐蚀向点蚀的转变与固溶处理温度、冷却速度,以及随后的人工时效温度和时效时间等诸多因素有关,发现经适当条件热处理的6000系铝合金可免受局部腐蚀影响．展望了铝合金晶间腐蚀研究的发展方向．     

社会网络对会计政策选择作用机理研究

会计政策选择研究是实证会计研究的核心.会计政策选择如同公司的其他决策一样,也是在社会网络情境下做出的.在中国上市公司现有制度背景下,依据社会网络理论,从企业连接强度和位置、网络弱连接、结构空洞、网络制度环境、企业网络结构的约束行为以及企业网络锁入效应等方面研究了社会网络对会计政策选择行为的作用机理.从社会网络新视角研究了企业会计政策选择过程,扩展了会计政策选择研究的理论视野.     

响应面法酶解剩余活性污泥中微生物蛋白质研究

从剩余活性污泥中提取及分解蛋白质是有效减少污泥二次污染的重要途径．以剩余活性污泥为原料,采用酶解法分解蛋白质,分析了体系ｐＨ值、酶解时间、酶解温度、酶用量、液固比对蛋白质分解率的影响,并应用响应面分析法优化蛋白质分解条件．结果表明:以蛋白质分解率为响应值,经实验后最终确定最优条件为:pH为7.0,液固比4.0:1.0,酶解时间为4.0h,酶解温度为58.0℃,酶用量（E:S）为3.0%,分解率达53.29%,接近响应面模型所预测的分解率．     

Implementation of an efficient segregated algorithm-IDEAL on 3D collocated grid system

The segregated algorithm-IDEAL (inner doubly-iterative efficient algorithm for linked-equations) is an efficient and stable algorithm. In this algorithm, there exist inner doubly-iterative processes for pressure equation, which almost completely overcome two approximations in SIMPLE algorithm. Thus the coupling between velocity and pressure is fully guaranteed, greatly enhancing the convergence rate and stability of iteration process. In this paper, implementation of the IDEAL algorithm on a 3D collocated grid system is conducted. The interface velocity is calculated by the modified momentum interpolation method (MMIM), by which the converged result is independent of the under-relaxation factor. Finally, five three-dimensional incompressible fluid flow and heat transfer problems are provided to compare the convergence rate and robustness between the IDEAL and three other most widely-used algorithms (SIMPLER, SIMPLEC and PISO). By the comparison it can be concluded that the IDEAL algorithm is more robust and efficient than the three other algorithms. Supported by the Key Project of National Natural Science Foundation of China (Grant No. 50636050), Fundamental Projects of Research and Development in China (973) (Grant Nos. 2006CB601203 and 2007CB206902)     

带有通讯能量约束的网络控制系统的H∞控制

文章研究带有通讯能量约束的网络控制系统的H∞控制问题．传感器使用不同能量级传输信息导致不同的丢包率．考虑传感器通讯能量约束,将网络控制系统建立为随机闭环系统,利用Lyapunov函数方法,以LMIs的形式给出保证闭环系统随机均方渐近稳定的充分条件和H∞控制器设计方法．     

紫茎泽兰化学防除效果研究

选取目前云南市场上常见的几种除草剂对紫茎泽兰进行防除．结果表明：各除草剂及其组合对紫茎泽兰的防治效果显著．草甘膦的灭杀效果最好,其对紫茎泽兰繁殖器官和植株茎秆影响显著;克无踪的防治效果最快,但不彻底．实际防治中草甘膦和克无踪配合使用效果最好．     

血络复欣颗粒对急性血瘀模型大鼠血液流变学的影响

目的研究血络复欣颗粒对大鼠血液流变学的影响。方法大鼠两次皮下注射盐酸肾上腺素,在此期问利 用冰水进行浸泡刺激,造成大鼠急性血瘀模型。腹主动脉采血,检测并观察药物对全血粘度、血浆粘度、红细胞压 积、红细胞电泳时间的影响。结果血络复欣颗粒明显降低血瘀模型大鼠全血粘度、血浆粘度、红细胞压积、红细 胞电泳时问。结论血络复欣颗粒具有改善血液流变状态的作用。     

逆变器带非线性负载时的输出电压控制技术

分析了逆变器带非线性负载时波形畸变的原因和影响 ,将波形畸变分成瞬态畸变和稳态畸变 ,并针对不同畸变给出了几种不同的控制方式 ,即根据非线性负载投入瞬间的冲击电流大小 ,采用自适应调节输出电压幅值的限流方法 ,以改善瞬态畸变程度 ;采用瞬时值波形反馈、无差拍控制技术来补偿稳态畸变波形 .给出了实验结果 ,研究结果对改善逆变器输出波形具有指导意义 .     

Research and applications of biochip technologies

Biochip as a new research field has enjoyed its rapid development in the past 10 years. Using microfabrication technology, thousands or hundred thousands of biological molecules can be assembled on a centimeter square microchip. Those chip-based devices can be used to analyze mutations, antigens, cells, etc. Compared with the traditional analytical instruments, chip-based micro total analytical systems have many advantages, such as reduced size, lower consumption of both reagents and energy, contamination-free, etc. Biochip technology is believed to revolutionize the future research in life sciences, disease diagnosis, drug discovery, forensic sciences and outer space exploitation in the coming century.     

Application of FLUPD-DD-PCR to the study of mRNA expression of glioma cells cultured under the condition of serum starvation

Fluorescently labeled universal primer directed differential display polymerase chain reaction technique (FLUPD-DD-PCR), an improved DD-PCR, is reported for the study of mRNA expression of glioma cells cultured with the serum starvation. The fluorescently labeled universal primer (FLUP) facilitates analysis of PCR products on an auto-sequencer. Compared with the traditional DD-PCR, FLUPD-DD-PCR has advantages of separation of target bands and measurement of mRNA expression quantitatively by adopting Cy5-labeled universal primer. And then the silver staining method has been used to recover the bands for use as template in re-pcr. In this study, 4 differential ESTs, of which 3 are novel ESTs, have been obtained. This work indicates some special novel genes, which can be induced to express under serum absent condition, are involved in coping with serum starvation stress on glioma cells growth.