Heat and Mass Transfer Enforcement of Vibrating Fluidized Bed

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On asymptotic stability of linear time-varying infinite-dimensional systems

It is shown that every asymptotically equistable linear time-varying infinite-dimensional discrete-time system x_k+1 = A_kx_k is uniformly asymptotically equistable, if A_k is a collectively compact sequence of bounded linear operators. Next, this result is used to prove that for a broad class of linear retarded functional differential equations, the notions of asymptotic equistability and uniform asymptotic equistability coincide.     

Determinations of the non-recrystallization temperature for X52 steel produced by compact slab process combined with direct hot rolling

Deformation comprises not only dimensional accuracy but also the control of the final microstructure and mechanical properties. Deformation below the non-recrystallization temperature (T _nr) is important to design the proper rolling schedule to avoid grain growth in the final stages of rolling. The determination ofT _nr for Nb-bearing carbon steel with a compact slab process mill log is carried out depending upon the Misaka concept calculation. A comparison among different formulas for predicting theT _nr was conducted using Misaka, Bratto, and Jonas equations. The Misaka equation depends on the chemical compositions and deformation parameters including dynamic and metadynamic recrystallization. The Bratto equation considers only the steel chemical composition. The Jonas equation depends only on the accumulated strain. The Bratto equation gives a large value ofT _nr, while the Misaka equations show a moderate and accurate value in relation to the Jonas results, which depend on torsion tests. The effect of strain accumulation on dynamic recrystallization is investigated to predict the final grain size of ferrite.     

无阀型气动凿岩机的多目标优化设计

本文对无阀型气动凿岩机进行多目标优化。建立了无阀型气动凿岩机构参数的多目标优化数学模型。采用统一目标法对实例进行了结构参数的优化计算。结果表明,优化计算是可行的。     

羊湖电站沉沙池溢流堰设计优化

羊湖抽水蓄能电站抽水时间多为拉萨电网有多余电量的丰水期，但丰水期正是雅鲁藏布江的丰沙期。为了减少泥沙对水轮机同轴的多级蓄能泵机组叶片等的磨损，因此在抽水系统中设计了沉沙池。本文对沉沙池溢流堰结构布置的设计优化，方便了施工，节约了投资，提高了经济效益，可为其它电站沉沙池结构布置设计的参考。     

新欢27块整体压裂优化设计

针对新欢27块低压、低渗的特点,研究了采油井、注水井同时压裂的区块整体压裂改造的可行性,建立了相关的油藏、裂缝数学模型,选取反九点注采井网单元,分别对注水井、采油井的裂缝参数进行了模拟优化计算,对影响区块整体开发效果的裂缝参数进行了分析,给出了最佳缝长、导流能力的数值范围.     

一种实用的功能陶瓷热压烧结装置

详细地介绍了热压成型工艺设备的结构，使用情况。该设备制作简单、实用。用它烧结的ＬＫＮＮ和ＫＴＮ材料致密均匀，电阻率较高，热释电系数较大，且介电损耗小。使用情况表明：该设备适用于致密陶瓷的烧结。     

High-Order Compact Schemes with Filters on Multi-block Domains

This paper presents the results of using high-order compact schemes with a high-order filter on multi-block domains. The Linearized Euler Equations (LEE) are solved on a uniform mesh for benchmark problems in one and two dimensions. Also a two dimensional mixing layer is solved by using Large-Eddy Simulation (LES). Three different boundary schemes are compared. The results compare well with the exact solutions and single-block domain results. The effect of the number of points of overlap among the subdomains is investigated. Having four points of overlap is chosen as a compromise between accuracy and efficiency.     

一种多参数钻井模型实时辩识方法

针对钻井生产过程随时间推移而逐渐变化的实际，提出了适于实时优化钻井的多参数钻井模型自适应跟踪算法。该方法不仅能对原来钻井模型进行实时修正辩识，而且利用计算机程序计算简便、控制精度较高。该方法是对两种递推算法的推广，特别适用于新探区建立钻井模型。文中有计算实例。