自动力套管补贴加固技术及其在B125井的应用

随着油田开发时间的延长，油水井井下套管的损坏将越来越严重，套管故障井将越来越多，为了恢复套损井生产，将套管损坏所造成的损失降到最低，在配套波纹管补贴，水动力补贴，爆炸补贴等专门修套技术的基础上，通过认真调查研究，又配套了操作方便简单，适用套管损坏类型广的自动力套管补贴加固技术，使各种套管变形，套管断错（错开没有位移或位移量不大时）、套管破裂，误射孔井段封堵，已射开水层封堵等修井作业的难度进一步降低，从而进一步提高了修复井综合开发经济效益。     

Evolutionary algorithms and de novo peptide design

One of the goals of computational chemistry is the automated de novo design of bioactive molecules. Despite significant progress in computational approaches to ligand design and efficient evaluation of binding energy, novel procedures for ligand design are required. Evolutionary computation provides a new approach to this design issue. This paper presents an automated methodology for computer-aided peptide design based on evolutionary algorithms. It provides an automatic tool for peptide de novo design, based on protein surface patches defined by user. Regarding the restrictive constrains of this problem a special emphasis has been made on the design of the evolutionary algorithms implemented.     

大庆油田套损井打通道加固技术

介绍了大庆油田近几年在套损井打通道加固技术方面取得的技术进步，在磨铣打通道技术上主要对钻铣工具的结构进行了优化设计及合理及合金刀块的优选组合，提高了磨铣效率，缩短了施工周期；在爆炸打通道技术中设计了安全隔爆装置，提高了施工的安全性，使爆炸扩径技术得到完善；Φ106mm密封加固技术的研制成功，取代了Φ100mm密封加固技术，为套损井修复后的完井工艺提供有效的技术支持，提出了大庆油田目前在套损井打通道加固方面存在的难题，结合国外在套损井打通道加固方面技术的新发展，对现有技术的局限性进行了分析，提出了今后技术攻关的方向。     

基于MFQ的补丁优先算法的研究与实现

目前采用的视频流调度算法，没有充分利用补丁流满足服务率高而占用系统资源少的优势，系统效率较低．为了提高效率，提出了一种基于MFQ的补丁优先算法，并给出了该算法的系统流程。通过对实验结果的比较，该算法在用户请求撤销率、节目调度不公平性和用户等待时间方面有明显的优越性．     

A 3D contact smoothing method using Gregory patches

In this work, a method is developed for smoothing three‐dimensional contact surfaces. The method can be applied to both regular and irregular meshes. The algorithm employs Gregory patches to interpolate finite element nodes and provide tangent plane continuity between adjacent patches. The resulting surface interpolation is used to calculate gaps and contact forces, in a variationally consistent way, such that contact forces due to normal and frictional contact vary smoothly as slave nodes transition from one patch to the next. This eliminates the ‘chatter’ which typically occurs in a standard contact algorithm when a slave node is situated near a master facet edge. The elimination of this chatter provides a significant improvement in convergence behaviour, which is illustrated by a number of numerical examples. Furthermore, smoothed surfaces also provide a more accurate representation of the actual surface, such that resulting stresses and forces can be more accurately computed with coarse meshes in many problems. This fact is also demonstrated by the numerical examples. Published in 2002 by John Wiley & Sons, Ltd.     

Effect of reliability of grounding of the shaft of a turboset on the operation of devices for control and protection of exciting circuits

Disturbance of the grounding of the shaft of a turboset or its absence for technical reasons can result in failure, misoperation, limitation of the operating zone, errors or limitation of the sensitivity of devices for control and protection of exciting circuits from single-point leakage, and electroerosion of elements of the turboset structure. Measures for increasing the reliability of the grounding of the shaft are discussed. __________ Translated from élektricheskie Stantsii, No. 3, March 2006, pp. 61–66.     

PLC在环锭捻线机上的应用

介绍了如何使用PLC和数字变频调速技术 ,对传统环锭捻线机进行技术改造 ,使锭速、捻度和卷绕成形变换实现数字化柔性控制 ,扩大了工艺参数的变化范围 ,使整个捻线加工车间实现信息化管理成为可能。     

国产550MW水轮发电机用新材料和新工艺

介绍了二滩水电站 5 5 0MW机组发电机定转子绕组方面所采取的新结构、新工艺和新材料     

Buckling analysis for delaminated composites using plate bending elements based on higher‐order zig‐zag theory

A finite element based on the efficient higher‐order zig‐zag theory with multiple delaminations is developed. The bending part of the formulation is constructed from the concept of DKQ element. Unlike conventional elements, a developed element has its reference in the bottom surface which simplifies zig‐zag terms on formulation. Exact patch solutions are developed on elements which have the bottom reference system. The present element passes proper bending patch tests in the arbitrary mesh configurations in isotropic materials. Zig‐zag formulation is adopted to model laminated plates with multiple delaminations. To assess the accuracy and efficiency of the present element based on higher‐order zig‐zag theory with multiple delaminations, the linear buckling problem of laminated plates with multiple delaminations has been analysed. The results have been compared with three‐dimensional elasticity solutions. The present element works as an efficient tool for analysing the behaviour of the laminated composites with multiple delaminations. Copyright © 2002 John Wiley & Sons, Ltd.     

带阻尼绕组的水轮发电机空载灭磁仿真

对转子带阻尼绕组的空载水轮发电机误强励时的灭磁进行了仿真计算。针对用非线性或线性电阻灭磁，以及用近似的分析表达式来考虑发电机空载特性的饱和，建立了微分方程组的数学模型，并利用差分法的数值计算，对三峡水电厂700 MW水轮发电机灭磁的实例进行仿真，得出了灭磁过程中磁场电流、电压和d轴阻尼绕组电流的变化曲线,以及灭磁时间和灭磁电阻、磁场绕组、d轴阻尼绕组吸收的磁场能量，并且给出了灭磁过程中空载发电机端电压在d,q轴分量的变化曲线。重点评价了水轮发电机转子阻尼绕组在灭磁过程中的作用。