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Abstract: A method was put forward for the detection of the fatigue cracks at the thread roots of a drill pipe by using ultrasonic wave.The specific detection probes were designed.Simulated cracks were detected.The results show that the probes can effecti
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文摘:钻杆螺纹根部疲劳裂纹是钻杆钻井服役中产生的常见缺陷类型，是钻杆螺纹发生断裂的重要根源.本文介绍了钻杆螺纹疲劳裂纹超声检测原理，设计了专用超声检测探头和检测装置，给出了检测试验结果，证明了钻杆螺纹疲劳裂纹超声检测的可行性和实用性. |
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Abstract: A methodology to reduce the input fuzzy sets with the hyperplane of generalized state error is discussed in this paper based on sliding mode control (SMC) theory,a method of varying nonlinear fuzzy sets range using some parameter is proposed ,an
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文摘:根据滑动模态原理，将模糊控制系统的输入量简化为广义跟踪误差的一个超平面，并基于三角形的非线性划分语言变量的隶属度，分析了模糊控制系统的某些性质，表明在系统稳定性、稳态误差等指标方面，模糊控制器优于一般的PID控制器. |
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Abstract: A microcomputer controller for condenser discharge seamwelder is introduced in this paper.The controlling principle,hardware structure,software flowchart and some specialities of controller are also discussed.
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文摘:介绍了电容贮能缝焊单片机控制器。介绍了控制原理、硬件结构、软件流程等设计思想及控制器的特点，这项研究对微型件尤其是精密件的焊接很有意义，已成功应用于细丝件、超薄件等的焊接。 |
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Abstract: A multifunctional composite sensing device is presented and the basic characteristic of its built-in texture is related.
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文摘:叙述多功能敏感器件内在结构的基本特性。 |
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Abstract: A mutual model reference adaptive method for the rotor speed and stator resistance identification is proposed in this paper to implement a speed sensorless direct torque control of induction motors.
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文摘:本文介绍了一种可互换模型参考自适应方法实现对电机转速和定子电阻的辨识，并将其应用于异步机的无速度传感器直接转矩控制中。 |
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Abstract: A nearshore subaqueous fan sandbody is an important oil-gas reservoir sandbody in the terrigerous oil basins of China.
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文摘:近岸水下扇储集砂体是中国陆相含油气盆地碎屑岩储集体的重要组成部分。 |
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Abstract: A neutron radiography system in reactor horizontal hole of Tsinghua University was introduced, and its capability of neutron radiography was evaluated by theory and experiment, the non-destructive testing for rocket fuse is successful.
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文摘:介绍了清华大学核研院反应堆水平孔道上的一个中子照相系统,通过理论分析和实验测定评价了它的中子照相能力,并对火箭导爆索进行了成功的检验。 |
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Abstract: A new algorithm W-ECOP is presented to effect incremental changes on a standard cell layout automatically.This algorithm deals with cell inserting and cell moving based on rows instead of on cells as most placement algorithms usually do.An integ
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文摘:提出了一种新的增量式布局方法W-ECOP来满足快速调整布局方案的要求.与以前的以单元为中心的算法不同,算法基于单元行划分来进行单元的插入和位置调整,在此过程中使对原布局方案的影响最小,并且尽可能优化线长.一组从美国工业界的测试例子表明,该算法运行速度快,调整后的布局效果好. |
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Abstract: A new approach,gate-capacitance-shift (GCS) approach,is described for compact modeling.This approach is piecewise for various physical effects and comprises the gate-bias-dependent nature of corrections in the nanoscale regime.Additionally,an ap
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文摘:提出了一种新的建立集约模型的方法,即栅电容修正法.此方法考虑了新型效应对栅电压的依赖关系,且可以对各种效应相对独立地建模并分别嵌入模型中.另外,利用该方法和密度梯度模型建立了一个多晶区内量子效应的集约模型.该模型与数值模拟结果吻合.模型结果和模拟结果均表明,多晶区内的量子效应不可忽略,且它对器件特性的影响与多晶耗尽效应相反. |
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Abstract: A new clock-driven ECO placement algorithm is presented for standard-cell layout design based on the table-lookup delay model.It considers useful clock skew information in the placement stage.It also modifies the positions of cells locally to ma
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文摘:提出了一种新的时钟性能驱动的增量式布局算法,它针对目前工业界较为流行的标准单元布局,应用查找表模型来计算延迟.由于在布局阶段较早地考虑到时钟信息,可以通过调整单元位置,更有利于后续的有用偏差时钟布线和偏差优化问题.来自于工业界的测试用例结果表明,该算法可以有效地改善合理偏差范围的分布,而对电路的其它性能影响很小. |
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Abstract: A new data structure that one link-list was composed of polygon-surface table,edge table and vertex table was proposed to describe the geometry information and topology information of control polyhedron M in the rese arch of modeling with closed
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文摘:介绍了在闭曲面造型研究中，为描述控制多面体M的几何信息和拓扑信息而设计使用的一种单链三表的数据结构.与其他适用与描述控制多面体的数据结构相比，该结构在结合了邻接多重表方法后的特点是:关系描述清楚，节省存储空间，方便查找和交互修改形体.在介绍单链中三表(面表、边表、顶点表)所含的几何信息细节、以及单链的三表之间的表示面、边、顶点拓扑关系的指针的邻接多重连接方式之后，本文给出了以C语言数组方式简明描述的数据结构实例. |
