二烧改造工程环保设备设计及特点

围绕二烧工程改造,介绍了该工程的环保设计原则,针对烧结生产中各工序的环境污染治理采取了一系列的措施,极大地改善了厂区环境,同时为类似的大型烧结机的环境保护和粉尘治理提供了有益的经验.     

Finding Optimal Ordering of Sparse Matrices for Column-Oriented Parallel Cholesky Factorization

In this paper, we consider the problem of finding fill-preserving sparse matrix orderings for parallel factorization. That is, given a large sparse symmetric and positive definite matrix A that has been ordered by some fill-reducing ordering, we want to determine a reordering that is appropriate in terms of preserving the sparsity and minimizing the cost to perform the Cholesky factorization in parallel. Past researches on this problem all are based on the elimination tree model, in which each node represents the task for factoring a column, and thus, can be seen as a coarse-grained task dependence model. To exploit more parallelism, Joseph Liu proposed a medium-grained task model, called the column task graph, and showed that it is amenable to the shared-memory supercomputers. Based on the column task graph, we devise a greedy reordering algorithm, and show that our algorithm can find the optimal ordering among the class of all fill-preserving orderings of the given sparse matrix A.     

Boosting Search with Variable Elimination in Constraint Optimization and Constraint Satisfaction Problems

There are two main solving schemas for constraint satisfaction and optimization problems: i) search, whose basic step is branching over the values of a variables, and ii) dynamic programming, whose basic step is variable elimination. Variable elimination is time and space exponential in a graph parameter called induced width, which renders the approach infeasible for many problem classes. However, by restricting variable elimination so that only low arity constraints are processed and recorded, it can be effectively combined with search, because the elimination of variables may reduce drastically the search tree size.In this paper we introduce BE-BB(k), a hybrid general algorithm that combines search and variable elimination. The parameter k controls the tradeoff between the two strategies. The algorithm is space exponential in k. Regarding time, we show that its complexity is bounded by k and a structural parameter from the constraint graph. We provide experimental evidence that the hybrid algorithm can outperform state-of-the-art algorithms in constraint satisfaction, Max-CSP and Weighted CSP. Especially in optimization tasks, the advantage of our approach over plain search can be overwhelming.     

关于消雷器的研究

本文叙述了自１９７７年首次提出消雷器研究课题以来的消雷器研究历程，对消雷器进行了试验室试验、现场实测和理论分析，以及参与国防科工委２７基地（西昌发射基地）的防雷方案的讨论，根据２７基地等现场对雷电参数和避雷针、半导体消雷器为时三年的对比试验，并参照国外有关文献〔１０〕，最后得出结论：无论是国外消雷器还是国内消雷器均不能“消雷”，半导体消雷器只是避雷针的一种而已。     

岩石声发射 Kaiser 效应测定地应力研究及工程应用

介绍了用声发射Ｋａｉｓｅｒ效应测定岩体地应力的原理、方法和测试技术以及数据处理。结合小浪底工程进行了ＡＥ法地应力测量，其结果与应力解除法比较一致。     

一种消除强谐波干扰的有效方法

谐波干扰是一种常见的干扰。本文提出了一种消除强谐波干扰的方法，它实现简单、速度快，尤其适用于对速度和实现有限制的场合。仿真结果证明了该方法消除谐波干扰和进行谐波恢复的有效性。     

大功率混合型APF用于大型冶炼厂谐波治理

为消除电力系统谐波及其巨大危害,根据大型冶炼厂谐波治理的特点,提出了一种新颖的拓扑结构-大功率混合型有源滤波器,它将串联谐振注入型有源滤波器与无源滤波器并联混合,由电容静态补偿无功功率,由有源和无源部分共同抑制谐波。实践证明该装置具有较好的滤波效果和一定的无功补偿能力。     

基于相移变压器的双桥整流器

为了消除电源电流中的特定谐波,首先采用相移变压器的双桥12脉冲整流器拓朴结构,用相移变压器相互抵消原理消除其线电流iA中的5、7、17和19次等谐波,同时采用选择谐波消除调制(SHE-PWM)法消除iA中所包含的11、13次谐波。SHE-PWM非线性方程组中各种情况下全部开关角度用数值计算法解出。用MATLAB软件和DSP320LF2407硬件平台仿真和实验研究该整流器的结果表明,这种整流器的调制电流iA<23次的谐波全部消除,线电压所有谐波失真仅1.49%,符合国际上对电能质量谐波失真的最严格的要求。     

奥里油在火力发电厂的应用及环保处理

委内瑞拉富藏奥里油约469亿t，中国政府与委内瑞拉政府签订了合作生产并每年向中国供应650万t奥里油的合作协议。鉴于此，介绍了奥里油的特性及其在火力发电厂的应用情况，分析了燃烧奥里油发电带来的特有的环保问题和处理方法。     

新的基于相分量的变压器模型及其在统一广义双侧消去法中的应用

提出了一种新的基于相分量的变压器模型，并通过对基本模型的拓展，将该模型成功地应用于统一广义双侧消去法中，克服了统一广义双侧消去法不能包含变压器的信息，不能直接对具有不同电压等级的复杂电力系统网络进行求解的缺陷，拓宽了统一广义双侧消去法的应用领域。该模型没有对变压器进行任何形式的等效，而是通过一导纳矩阵对变压器进行描述。该导纳矩阵包含了变压器各绕组的联结方式、变压器的电气参数及变压器中性点的接地方式等信息。实际算例表明，该模型计算精度高，且该模型所需的输入参数少，输入灵活，便于实际工程应用。