氯丁橡胶的溶液接枝反应研究

本文研究了引发剂过氧化苯甲酰的用量对ＣＲ接技ＭＭＡ－ＡＡ反应的单体转化率、接枝率及接枝胶的粘度、剥离强度等的影响，并用红外光谱和元素和元素分析对反应产物进行了表征．结果表明，体系中存在接枝、降解、交联三种反应，在不同的配方和工艺条件下，三种反应的反应程度不同．     

NDN-1型氮氧化物脱除催化剂的评价及应用

对NDN-1型氮氧化物脱除催化剂进行了实验室性能评价,并与进口催化剂A及国产催化剂B进行了比较,结果表明,NDN-1型催化剂的化学组成、结构、性能均优于进口催化剂A。介绍了该催化剂在南京帝斯曼东方化工有限公司工业应用的情况。     

Emotional speech feature normalization and recognition based on speaker-sensitive feature clustering

In this paper we propose a feature normalization method for speaker-independent speech emotion recognition. The performance of a speech emotion classifier largely depends on the training data, and a large number of unknown speakers may cause a great challenge. To address this problem, first, we extract and analyse 481 basic acoustic features. Second, we use principal component analysis and linear discriminant analysis jointly to construct the speaker-sensitive feature space. Third, we classify the emotional utterances into pseudo-speaker groups in the speaker-sensitive feature space by using fuzzy k-means clustering. Finally, we normalize the original basic acoustic features of each utterance based on its group information. To verify our normalization algorithm, we adopt a Gaussian mixture model based classifier for recognition test. The experimental results show that our normalization algorithm is effective on our locally collected database, as well as on the eNTERFACE’05 Audio-Visual Emotion Database. The emotional features achieved using our method are robust to the speaker change, and an improved recognition rate is observed.     

Interfacial Proton Supply/Filtration Regulates the Dynamics of Electrocatalytic Nitrogen Reduction Reaction: A Perspective

As a promising energy carrier, ammonia synthesis by electrocatalytic nitrogen reduction reaction (eNRR) is a promising green and low-carbon ammonia synthesis strategy that can replace the traditional Haber–Bosch process. However, the development of eNRR processes is mainly severely constrained by competitive hydrogen evolution reaction (HER), and the corresponding strategies to inhibit this adverse side reaction to obtain high eNRR selectivity are still limited. In addition, for this complex reaction involving gas–liquid–solid three-phase interface and proton/electron transfer, it is great significance to analyze and summarize the existing inhibition HER strategies from the viewpoint of dynamics. In view of this, this work reviews proton supply/filtration regulation strategy in catalytic system, allowing a systematic survey of the literature focusing on interface membrane regulation (inorganic membrane and organic membrane), electrolyte regulation (metal-mediated strategy and electrolyte ion regulation strategy) and system device design (electrode structure design and electrolytic cell device design). Constructive catalytic system design guidance is also suggested to inhibit hydrogen evolution and improve NH₃ selectivity, aiming for scalable and economically feasible applications.     

含氢储能的多源联合发电系统调度研究

风电和光伏发电具有间歇性和随机性,为了降低在多源联合发电系统中的弃风弃光率,采用含氢储能系统和火电机组配合来平滑风电和光电机组出力。文中以系统运行成本最小和弃电惩罚成本最小为目标,以系统功率平衡、火电机组出力和爬坡、热备用、风电和光电出力及储能系统储氢罐容量、电解槽和燃料电池功率等为约束条件构建了多源联合发电系统日前调度模型。通过YALMIP工具箱对模型进行编程,并调用CPLEX对编写的程序进行求解。对含有风电、光电、火电机组以及储能系统的多源联合发电系统进行算例分析,通过对比有无储能系统的弃风弃光量和系统总运行成本,证明了含氢储能系统可以有效降低系统的弃风弃光率,并提高系统的经济性。     

紧固件稳健性设计对动力总成悬置强度影响

在动力总成悬置的开发过程中,悬置支架分析计算满足设计要求,但台架和路试中却出现断裂的情况时有发生,紧固件是影响其计算精度的重要因素之一.通过有限元法研究紧固件安装顺序对发动机悬置仿真精度的影响;通过六西格玛方法研究紧固件的稳健性设计对发动机悬置仿真精度的影响;基于所得出的结论对悬置支架进行方案优化,并对优化后的结果进行仿真和试验验证,结果表明在发动机悬置的设计中夹紧力对仿真精度有重要影响.对采用六西格玛设计的最小紧固件加紧力进行仿真计算是一种最稳健的设计.     

我国煤矿通信现状及其发展

介绍了我国矿井通信的现状及已经得到广泛应用的产品 ,并就 2 0 1 0年矿井通信发展的 3个阶段及其研究工作进行阐述。     

聚烯烃弹性体对硅橡胶的共混改性

研究了硅橡胶／聚烯烃弹性体(POE)共混物的物理机械性能和相形态。结果表明，硅橡胶／POE共混物为两相结构，POE的加入能有效地提高硅橡胶的物理机械性能。     

多PowerPC 7400/7410处理器体系架构研究

PowerPC 7400/7410处理器是新一代的PowerPC G4处理器,带有高性能的AltiVec单元,其大小为128bits,该单元有利于处理高吞吐量的数据,因此可用来满足完成数字信号处理的要求,成为DSP的强有力替代品.该文通过对4个PowerPC处理器的3种并行体系架构分析和在雷达数字信号处理的性能比较下提出了改进参考模型,以供研究.