BP/THF引发体系引发降冰片烯与马来酸酐可见光自由基共聚合

研究了BP/THF引发体系引发降冰片烯(NB)与马来酸酐(MA)自由基光聚合性能.考察了单体和引发剂浓度、第三单体的加入和氛围对共聚合收率的影响.采用红外光谱(FTIR)、核磁共振谱(NMR)、元素分析和高效凝胶液相色谱(GPC)对聚合物进行了表征与分析.在单体比为1:1时,共聚物中NB和MA的含量分别为54.2%和47.8%.     

遗传神经网络-紫外分光光度法同时测定苯酚和邻苯二酚

研究吸收光谱重叠严重的苯酚和邻苯二酚的两组分体系,针对BP神经网络易陷入局部极小等缺陷,将遗传算法与BP神经网络相结合,用遗传算法优化神经网络的初始权值和阀值,由神经网络输出的误差构造适应度函数,建立遗传神经网络算法,用紫外分光光度法同时测定混合的苯酚和邻苯二酚,预测集样品的相对平均误差分别为0.818%和0.366%,对水样的加标回收率分别为104.7%和102.9%。     

Molecular Mechanisms of Parthanatos and Its Role in Diverse Diseases

Differential evolution of apoptosis, programmed necrosis, and autophagy, parthanatos is a form of cell death mediated by poly(ADP-ribose) polymerase 1 (PARP1), which is caused by DNA damage. PARP1 hyper-activation stimulates apoptosis-inducing factor (AIF) nucleus translocation, and accelerates nicotinamide adenine dinucleotide (NAD⁺) and adenosine triphosphate (ATP) depletion, leading to DNA fragmentation. The mechanisms of parthanatos mainly include DNA damage, PARP1 hyper-activation, PAR accumulation, NAD⁺ and ATP depletion, and AIF nucleus translocation. Now, it is reported that parthanatos widely exists in different diseases (tumors, retinal diseases, neurological diseases, diabetes, renal diseases, cardiovascular diseases, ischemia-reperfusion injury...). Excessive or defective parthanatos contributes to pathological cell damage; therefore, parthanatos is critical in the therapy and prevention of many diseases. In this work, the hallmarks and molecular mechanisms of parthanatos and its related disorders are summarized. The questions raised by the recent findings are also presented. Further understanding of parthanatos will provide a new treatment option for associated conditions.     

Recursive identification for Hammerstein–Wiener systems with dead-zone input nonlinearity

A new recursive algorithm is proposed for the identification of a special form of Hammerstein–Wiener system with dead-zone nonlinearity input block. The direct motivation of this work is to implement on-line control strategies on this kind of system to produce adaptive control algorithms. With the parameterization model of the Hammerstein–Wiener system, a special form of model estimation error is defined; and then its approximate formula is given for the following derivation. Based on these, a recursive identification algorithm is established that aims at minimizing the sum of the squared parameter estimation errors. The conditions of uniform convergence are obtained from the property analysis of the proposed algorithm and an adaptive setting method for a weighted factor in the algorithm is given, which enhances the convergence of the proposed algorithm. This algorithm can also be used for the identification of the Hammerstein systems with dead-zone nonlinearity input block. Three simulation examples show the validity of this algorithm.     

一种基于重心法的连锁经营企业区域物流配送中心选址模型

提出了配送中心吸引力指数的概念,建立了以吸引力指数最大为目标函数的选址理论模型.考虑了模型解决具体问题的实用性,引入交通区位和地价2个权重因素对不同候选地址的吸引力指数进行加权,实现连锁经营企业区域物流配送中心的选址优化.通过具体算例表明算法能够获得更切合实际的目标解,且搜索时间短、效率较高.     

高压线路加装避雷器可减少线路雷击跳闸率

减少线路雷击跳闸率已成为人们共同关注的课题。国内外运行经验表明，加装线路避雷器可有效降低线路雷击跳闸率。浙江电力部门针对雷击跳闸频繁的线路，在易击段加装了线路型避雷器，积累了新的线路防雷经验。     

数—模综合仿真接口算法分析

针对微电网的推广应用还面临着诸多技术难题的问题,将电力系统数字仿真与物理模拟各自的优点与不足结合起来,充分发挥各自优势便可形成数模综合仿真模型,该模型将在微电网技术研究中发挥重大的作用。数模综合仿真接口是数模综合仿真系统的核心部件,而接口算法的选取是数模综合仿真接口设计的基础。在总结现有算法的基础上重点分析了理想变压器模型的稳定性,提出加强稳定性的有效措施及不稳定情况的处理方案。最后,通过算例仿真验证了各措施的有效性。     

同源连杆机构构成特性和传动角的研究

从理论上揭示了原始机构及其同源机构在尺寸型上的内在联系,即它们的确生成了同一条轨迹.还提出,同源机构与原始机构的对应构件有相同的角速度;在通常使用情况下,同源四杆机构与原始四杆机构具有相同的传动角.     

非均匀介质透射波Goos-Hnchen位移的研究

基于不变嵌入理论,推导出电磁波入射到非均匀介质平板,反射系数和透射系数的耦合波方程;利用稳态相位方法,分析了透射波Goos-Hnchen(GH)位移的性质。通过数值计算,研究了入射角和介质厚度对透射率及GH位移的影响。结果显示,介质厚度一定时,透射率在特定角度具有极大值,对应的透射波发生负的GH位移,并且位移绝对值最大;入射角不变时,透射率和GH位移随厚度呈周期性变化,厚度增加,透射率呈下降趋势,但GH位移呈增大趋势。GH位移受入射角和介质厚度的影响很大,因此,可以通过调节厚度和入射角,获得合适的透射率和GH位移。