高频MnZn功率铁氧体烧结工艺研究

按照氧化物陶瓷工艺对高频MnZn功率铁氧体烧结工艺条件进行了研究。烧结温度越高，晶粒越大，晶界越薄，电阻率越低，磁芯损耗越大，起始磁导率和烧结密度分别在1240℃和1230℃达到最大值。延长保温时间，可以使晶粒充分生长，晶界变薄，电阻率减小，损耗增大。保温3h后，起始磁导率和烧结密度均可达到最大值。氧分压越低，材料起始磁导率越高，电阻率越小，损耗越大，但氧分压低于5％后烧结密度不再继续增加。     

Restricted overlapping balancing domain decomposition methods and restricted coarse problems for the Helmholtz problem

Overlapping balancing domain decomposition methods and their combination with restricted additive Schwarz methods are proposed for the Helmholtz equation. These new methods also extend previous work on non-overlapping balancing domain decomposition methods toward simplifying their coarse problems and local solvers. They also extend restricted Schwarz methods, originally designed to overlapping domain decomposition and Dirichlet local solvers, to the case of non-overlapping domain decomposition and/or Neumann and Sommerfeld local solvers. Finally, we introduce coarse spaces based on partitions of unity and planes waves, and show how oblique projection coarse problems can be designed from restricted additive Schwarz methods. Numerical tests are presented.     

压裂预处理技术的现场实施与评价

通常，压裂目的层的储层特征、物性及生产史差异较大，为保证压裂施工成功并取得较好的压裂效果，进行油层预处理十分必要。介绍了酸预处理、前置液氮预处理、柴油十互溶剂混合液预处理3种技术，阐述了各种预处理方法的目的及适应性，介绍了各种预处理技术在现场取得的效果，提出了各种预处理技术的适用条件及常用做法。     

Stokes问题一个矩形非协调元逼近

提出了一个新的矩形非协调混合元格式,把它应用于Stokes问题的数值逼近,得到了最优的误差估计.     

某地铁站中央空调空调水系统节能技术改造方案

本文针对某地铁站中央空调水系统工程分析了目前系统中水泵的能耗起因，并提出了改造水泵降低能耗的具体方法，与改造前系统水泵能耗相比降低了56％。     

大庆长垣以东古隆起天然气成藏条件的差异性

由长垣以东地区深层天然气分布特征，指出安达—肇州和朝阳沟—肇东古隆起是天然气运移指向和聚集的有利场所。造成安达—肇州古隆起上天然气显示好于朝阳沟—肇东古隆起上天然气显示，前者已获得了大量工业气流，而后者仅见少量气流或显示。但由于天然气在供气条件、储集条件、盖层条件、圈闭条件和运移条件上的差异，造成安达—肇州古隆起本身天然气显示也存在差异，昌德构造、卫星—升平构造和汪家屯构造天然气显示好于模范屯—肇州西构造天然气显示。     

Study on a Distributed Wavelength Routing Algorithm in WDM Optical Transport Networks

A new design scheme for a distributed algorithm for routing and wavelength assignment (RWA) is developed in this paper, and the communication rules between the nodes to exchange signaling packets are discussed. The Adaptive-Alternate-Routing-Least-Load (AARLL) algorithm is implemented in the distributed scheme for the first time. Under dynamic traffic circumstances, the influence of the race condition, which does not exist in centralized scheme, on the network performance is analyzed and the analyzed results show that the race condition has a major impact on network performance only under light traffic load, while under medium and heavy traffic load the impact is very small. To analyze the performance loss caused by adopting the distributed algorithm for RWA, the capacity loss factor (CLF) is introduced and the calculated results show that CLF does not exceed 6% under medium traffic load.     

FD—TD在分析FSS中的应用

本文讨论了用FD TD分析FSS的有关问题,提出了一种适合于在任意入射角情况下分析FSS的有效吸收边界条件,分别以单层、双层FSS为例进行了计算.数值结果和矢量模式法、谱域法的结果非常一致.     

CH_4、CO_2与O_2制合成气的研究 Ⅱ工艺条件的影响

在固定床反应器中考察了１２％Ｎｉ－５％ＲＥ－２％Ｃｕ－２％Ｌｉ／Ａｌ２Ｏ３（ｍａｓｓ）催化剂在ＣＨ４、ＣＯ２与Ｏ２催化氧化重整制合成气反应中催化剂粒径、工艺操作条件（空速与温度）及原料气配比对反应的影响，确定了较佳的操作条件：催化剂粒径２０～４０目，反应最佳温度为８００℃，ＳＶ＝４×１０４ｍｌ／（ｇ·ｈ）。同时看到在不同的原料气配比的条件下该催化剂的活性亦很稳定，不仅达到了反应平衡，且产物Ｖ（ＣＯ）／Ｖ（Ｈ２）比有很强的调变性。     

有耗介质中电磁波传播的时域有限差分法

在推导有耗介质中Maxwell方程差分格式的基础上,详细讨论了时域有限差分法（FDTD）中主要参数的取值原则。对总场边界条件进行了改进,使入射波的泄漏很小,且不用对总场区的4个角点单独处理。讨论了简便的PML条件,避免了Berenger完全匹配层中场分裂过程。采用文中所介绍的方法,对地下有耗介质的理论模型进行了FDTD正演模拟,模拟结果可以反映地下有耗介质的有用信息,验证了该模拟技术的正确性和可靠性。