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Search Results: 1 - 10 of 49867 matches for " 田亮 "
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目标市场确定及策略赢得描述的物元模型

系统工程理论与实践 , 1999,
Abstract: 利用关联函数,提出了在竞争条件下目标市场的确定方法.并借助于可拓关系对目标市场策略的赢得进行了描述,讨论了策略赢得可拓的实现手段,及策略赢得的可拓域
烟道排气分析计的多功能化:岛津NOA—308Dx式NOx—O2测定装置
,江涛
红外 , 1998,
Abstract:
Research on the framework of component -based MES for printing and dyeing
基于构件的印染行业MES整体架构研究

梅红,
计算机系统应用 , 2007,
Abstract: 通过对印染行业制造特点以及相关软件技术的分析,建立了印染行业制造执行系统体系结构逻辑模型,整体上采用J2EE的技术路线,设计了基于EJB构件的构件化支撑平台.提出了整个印染行业快速实施MES非常行之有效的模式,探讨了与此模式相关的构件表征与检索.
汽轮发电机质量监督关键技术分析与应用
赵勇,
热力发电 , 2009,
Abstract: 汽轮发电机制造质量监督对机组的安全运行起着至关重要的作用。结合事故案例分析,介绍了汽轮发电机制造质量监督中容易被忽略的产品设计改进、制造阶段清洁度的控制、质量检验过程、产品包装过程、关键部件的采购等关键质量控制环节,并对更有效地发挥制造质量监督的作用提出了相应的措施和建议。
刘学勤论治肝硬化腹水经验

中国中医药信息杂志 , 2015, DOI: 10.3969/j.issn.1005-5304.2015.11.037
Abstract:
一种结合辅助估距锚点的WSN改进型DV Hop算法
Improved DV Hop algorithm in WSN combined with auxiliary anchor distance estimator

李彦,
- , 2016,
Abstract: 针对传统的无线传感器网络定位算法(DV Hop算法)在进行距离估算时定位精度较差的问题,文中提出一种基于估距方式分类的无线传感器网络定位算法。该算法将最优辅助估距锚点引入,并且未知节点估算距离时,首先根据要估算的距离搜寻最优辅助估距锚点,再根据估距所属的类型来实施估距计算,以此改善距离估算的精度。为将定位精度进一步提高,所提算法在三边定位法中结合“非线性 跳数”加权因子,以此得到未知节点最终估计坐标的期望。实验结果表明,该算法在一定程度上提高通信开销,算法的定位精度能够明显改善。
Aimed at the poor positioning accuracy problem of traditional localization algorithm (DV Hop algorithm)in wireless sensor network(WSN) for performing distance estimation,this paper proposes a localization algorithm in the WSN based on the estimation of distance.Firstly,the algorithm introduces the best auxiliary estimate distance anchor,when the unknown nodes estimate the distance,searching the best auxiliary estimate distance anchor based on the estimated distance.Then the estimated distance is calculated according to types belonged from the estimated distances,thus improving the accuracy of the distance estimation.To further improve the positioning accuracy,the paper introduces the “nonlinear hop count” weighting factor is introduced into the three edge positioning method,obtaining the final estimate of the unknown node.Simulation results show that the accuracy of the algorithm is improved with the increase of the communication overhead
粘弹性力学在高温铸造合金单向拉伸试验中的应用
Application of Viscoelasticity Mechanics into Uniaxial Tensile Test of High Temperature Cast Alloy
 [PDF]

, 朱大林, 秦红玲
International Journal of Mechanics Research (IJM) , 2013, DOI: 10.12677/IJM.2013.21002
Abstract:

给出了Kelvin链的应力–应变微分型本构关系。全面考虑初始条件,推导了Burgers四参量流体、Kelvin- Maxwell六参量模型在阶跃函数单向应力作用下的总应变通解。Burgers四参量流体、Kelvin-Maxwell六参量模型都可以近似地描述金属材料蠕变曲线的前两个阶段,但都不能反映第三个阶段。铸造Mar-M200合金蠕变曲线的计算表明,两种理论预测与实验测量的结果的一致性较好,特别是Kelvin-Maxwell六参量模型的最大相对误差仅为5.4765779%。

The stress-strain differential constitutive relation was given for Kelvin chain. On basis of all the initial conditions taken into account, the general solutions of total strain were derived for Burgers fluid with 4 parameters and Kelvin-Maxwell model with 6 ones under the step function uniaxial stress. Both Burgers fluid with 4 parameters and Kelvin-Maxwell model with 6 ones could approximately describe the former two stages of creep curve but not reflect the third stage. Numerical calculation for cast Mar-M200 alloy creep curve shows that two theories predictions are in good agreement with test measurement results, especially the maximum relative error of Kelvin-Maxwell model with 6 parameters is only 5.4765779%.

机械结合面接触模型的研究进展及存在的问题
Advances and Existing Issues in Contact Model of Mechanical Joint Surface
 [PDF]

, 朱大林, 秦红玲
Mechanical Engineering and Technology (MET) , 2013, DOI: 10.12677/MET.2013.21001
Abstract:
介绍了机械结合面的基本概念。一台机床90%以上的阻尼来自机械结合面。影响机械结合面特性的因素众多,且多为非线性性质。对机械结合面的几种常用接触模型如统计模型、分形模型、有限元模型、试验模型进行了比较全面的回顾和评述,详细地论述了相应模型的优点、存在的问题和应用范围。最后指出了还没有妥善地解决好机械结合面一系列最基本的问题。
The basic concept about mechanical joint surface was introduced. More than 90% of damping in a machine tool comes from mechanical joint surface. There are many factors that affect the characteristics of mechanical joint sur-face, most of which are nonlinear. Some contact models in common use, for example statistical model, fractal model, finite element model and experimental model were relatively generally reviewed. Their advantage, existing issue and application range were discussed in detail. At last, some most basic problems unsatisfactorily solved were pointed out.
基于状态观测器的软测量动态补偿方法
Dynamic Compensation Method for Soft Sensing Based on State Observer
 [PDF]

武现聪, , 杜文霞
Modeling and Simulation (MOS) , 2016, DOI: 10.12677/MOS.2016.53012
Abstract: 荧光显微图像复原有着很多重要的应用,例如,天文成像,电子显微镜成像,单光子发射计算机断层成像术和正电子发射断针对采用机理分析方法得到的煤发热量存在响应速度迟缓、变负荷时动态误差大的问题,提出一种基于状态观测器的动态补偿方法。依据单元机组负荷–压力模型,由汽包压力和汽轮机一级压力构造锅炉总热量信号,采用一高阶惯性环节描述锅炉给煤量与总热量信号之间的动态关系。针对此高阶惯性环节设计状态观测器,得到具有较小惯性的中间状态信号,利用此信号除以给煤量得到煤发热量信号。实验结果表明:动态补偿后的煤发热量具有抗扰动性好、响应速度快的优点。
The coal calorific value calculated by using the method of mechanism analysis has slow response speed and big dynamic error under variable load conditions. In order to solve this problem, a dy-namic compensation method based on state observer is proposed. Based on the load-pressure model of unit, the total heat input into the boiler is constructed by the drum pressure and the tur-bine primary pressure. The dynamic relationship between the boiler fuel flow and the total heat is described by a high order inertia link. By designing a state observer for the high order inertia link, the intermediate state signal with smaller inertia is obtained, which is divided by the fuel flow to gain the signal of the coal calorific value. The signal of coal calorific value has small dynamic error under variable load conditions, Experiments show that: the signal of coal calorific value has better behaviors on disturbance restraint and dynamic response.
MapInfo矢量数据到S57标准数据的映射研究与实现
少华,
大连海事大学学报 , 2015, DOI: 10.16411/j.cnki.issn1006-7736.2015.03.010
Abstract: 为提高内河助航能力,提出一种由MapInfo矢量数据到S57标准数据映射的开发内河电子航道图的新方法.在重点研究MapInfo通用交换格式矢量数据结构和S57标准矢量数据拓扑结构的基础上,建立详细的矢量数据结构模型;分析总结二者之间的差异性和映射关系,运用Helmert7参数转换法完成坐标系映射,采用累加去重的方法建立矢量数据拓扑结构,使用人工匹配方式设计对象及其属性的XML映射数据库,并构建矢量数据映射模型;最后,设计基于Linux平台的软件流程,在QT环境下实现该映射技术.映射后的电子航道图已成功加载到船载ECS系统上和上海埃威公司B类AIS终端设备上.试验结果表明了该映射方法的可行性和通用性及其实用价值,并为S100标准航道图的研究奠定了基础.
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