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First the math theory of machining simulation is studied, and the set structure of NC machining simulation system whose components, including time, input, output and so on, are defined. Hereby we set up the hierarchy structure, the logical structure, the static model and the dynamic model of simulation system. The construction method of sweep entity of cutter and rotation parts is researched, and their differential geometry invariants are calculated. NC code is unscrambled, and the recursion division arithmetic of time segment is put forward, which is the driven data of the movement or rotation parts. The CLDATA should be interference-free. To examine if there is interference between cutter flank and the work piece, an arithmetic that discussed the existence of intersecting curve between them is put forward. To examine if there is interference between two turrets, an arithmetic that discussed the existence of intersection set between two polygons is put forward.
首先研究加工过程仿真的数学基础,然后定义数控加工仿真系统的集合结构及时间集、输入集、输出集等概念,建立加工仿真的层次结构和逻辑结构,阐述双刀车削仿真系统的静态模型和动态模型建立方法,分析刀具扫描体和旋转部件扫描体的建立方法及其微分几何性质;研究NC代码解读技术和双刀加工时间段递归子分划技术,为驱动各仿真单元作数据准备;通过讨论后刀面和工件表面交线的存在性判断刀具后刀面与工件间是否干涉,通过求多边形的交集判断刀架与刀架是否干涉。
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This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.
本文法对耕地等别划分的原则、内容及方法作了较详细的阐述,介绍了多系数综合修正法的耕地等别计算方法及其具体应用和AHP的确权方法;分析了耕地等别划分工作与地理信息系统技术相结合的必要性,简要介绍了地理信息系统软件ARC/INFO及其他相关软件的功能特点,制定了地理信息系统支持下耕地等别划分的技术路线,通过对河北省蠡县蠡吾镇的实证研究,重点阐述了ARC/INFO及相关数据库软件与耕地等别划分结合的有效机制及GIS应用的一些新思想、新方法:提山了对土壤图和土地利用现状图等基础图形数据库进行特征编码的思想和具体的编码方案,阐述了基于与图形库相链接的特征编码表,单因素图提取、成果图的输出的具体实现方法;提出了GIS环境下耕地单元划分的原则和方法,即在保留土壤因素图斑界线、行政界线和重要地物等的原则下,将土壤单因素图和土地利用现状图进行拓扑叠加,对叠加图中的矢量线进行适当的删除;阐述了在计算机环境下,耕地分等参数计算模型建立的方法,并用FOXPRO6.0语言程序实现了参数计算的自动化;阐述了根据图形库特征编码表和建立绘图符号查找表,按不同图层叠加绘制成果图的方法,该过程用命令程序实现耕地等别图的输出。
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Five novel torsion-mirror optical actuators including double-beam thickness differential structure with single torsional axis, double flexible folded-beam structure with single torsional axis, double-beam vertical torsion comb structure with single torsion axis, four-beam differential compound-micromirror structure with double torsional axis and the combined structure of the four basis forms above, are brought forward. All of these devices could be fabricated by the same silicon micromachining process we have developed. The deformation compensation design with local enhancement for the thin torsional beam which is the key structure of these devices is also put forward to improve the reliability. The three-dimension solid model and two-dimension reduced order model of the torsion-mirror optical actuator are established and then the numerical simulations for evaluating the device characteristics of the statics, dynamics, electrostatic field, mechanical and electrostatic coupling, fluid and solid coupling are carried out to optimize the structure design. Furthermore, three optical fibre clamping structures which could be integrated monolithicly are designed and analyzed to improve the optical coupling capability. 4. Three flexible process flows combined with bulk silicon micromachining and surface silicon micromachining are brought forward to fabricate these novel single-crystal silicon or polysilicon torsion-mirror optical actuators by using the same lithography masks for both SOI wafer and regular silicon wafer. A series of important process experiments are carried out to optimize the process parameters and the process flows. Some novel and typical process phenomena which occurred during the microfabrication are analyzed and then the corresponding solutions are put forward. 5. A MEMS dynamic testing system which exploit blur image synthetic technique, stroboscopic image matching technique, stroboscopic mirau microscopic interferometry technique and microscopic laser dopper vibrometer technique is set up to measure three-dimension and six-freedom micro motions of any MEMS devices with nanometer resolution.
在对硅微机械扭转镜光致动器的光机电特性系统地理论研究的基础上提出了硅微机械扭转镜光致动器的结构设计准则。3、提出了单轴双梁厚度差分结构、单轴双柔性折叠梁结构、单轴双梁垂直扭转梳齿结构、双轴四梁差动复合微镜结构以及以上四种基本结构组合后的衍生结构等五种工艺加工技术兼容的新型的硅微机械扭转镜光致动器,对器件关键结构薄厚度、高耐疲劳扭转梁进行了局部加强的变形补偿设计,建立了器件的三维实体模型以及两维降阶模型,对提出的新结构硅微机械扭转镜光致动器进行了系统的静力学、动力学、静电场、力电耦合和流体固体耦合的建模仿真与优化设计,同时设计并分析了三种可实现单芯片集成的弹性光纤定位夹紧结构。4、提出了组合体硅微加工技术与表面硅微加工技术、兼容同一套光刻版图、可分别基于SOI 晶片和普通Si 晶片、适应于制造提出的各种新结构单晶硅和多晶硅硅微机械扭转镜光致动器的三套柔性加工工艺流程,开展了一系列重要工艺步骤的单项工艺试验,对工艺流程与工艺参数进行了优化,针对加工过程中出现的具有普遍意义的典型工艺问题进行了讨论和分析,并提出了解决方法。5、创新性地将模糊图像合成技术、频闪图像匹配技术、频闪Mirau 显微干涉技术与显微激光多普勒测振技术有机结合,建立起了一套周期运动测量与瞬态运动测量相结合、单点运动测量与全视场运动测量相结合、满足不同MEMS 器件各种动态测试要求的集成的MEMS 三维六自由度微运动精密测量系统。
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In the test model, a new type joint connection of one-way hinge is put forward for achieving pure-hinge connection; In the shape forming test, because of the little post-tensioning forces, a new type loading method of twisting nut for drawing wire is put forward in stead of jack tensioning for solving the questions, such as super-tensioning and the nonuniform rate of loading; In the loadtest, a new type vertical loading system of multiple-point fixed pulley is put forward for solving the questions, such as more loading points and larger vertical force at one loading point.
试验模型中,为了实现纯铰接连接,提出了一种新型的单向铰节点连接形式;成形试验中,由于后张拉力较小,提出了一种新型拧螺母抽钢丝的加载方法,很好的解决了千斤顶易超张拉和加载速率不均匀等问题;承载力试验中,为了解决加载点较多、单点加载较大的问题,提出了一种新型多点定滑轮竖向加载系统。
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In the test model, a new type joint connection of one-way hinge is put forward for achieving pure-hinge connection; In the shape forming test, because of the little post-tensioning forces, a new type loading method of twisting nut for drawing wire is put forward in stead of jack tensioning for solving the questions, such as super-tensioning and the nonuniform rate of loading; In the load test, a new type vertical loading system of multiple-point fixed pulley is put forward for solving the questions, such as more loading points and larger vertical force at one loading point.
试验模型中,为了实现纯铰接连接,提出了一种新型的单向铰节点连接形式;成形试验中,由于后张拉力较小,提出了一种新型拧螺母抽钢丝的加载方法,很好的解决了千斤顶易超张拉和加载速率不均匀等问题;承载力试验中,为了解决加载点较多、单点加载较大的问题,提出了一种新型多点定滑轮竖向加载系统。
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In order to overcome the technological difficulties encountered in the course of insulation fault diagnosis on the base of dissolved gases analysis, several kinds of mathematic models and actualized methods are brought forward to improve the reliability and veracity of fault diagnosis of transformers. The research works are shown mainly as followings:1 A modified fuzzy multi-criteria method is brought forward for insulation fault diagnosis of transformer. Furthermore, a new method for insulation fault diagnosis is proposed on the base of fuzzy multi-criteria together with rule reasoning. With fuzzy diagnosis in the method, fault reasons are filtrated and then the reasons in low probability are prohibited, Moreover, the left reasons are testified by using rule reasoning and then final concludes are drawn in much less misjudge probability and better results.2 On the base of geometry characteristics of C- partition to sample set of DGA data of transformer, a method is put forward to compute effective radius of neighbor field of a sample, number of clusters and values of initial centers. Moreover, the fuzzy C- means cluster model with adaptive weight is brought forward in the first time and then the fault classifier is designed for insulation fault diagnosis of transformer.3 According to the weakness of the degree of gray of gray incidence, a new formula to compute DGI is put forward and then incidence order criterion is ascertained. Moreover, a new DGI model for fault diagnosis is proposed according to the further analysis to relationship between fault reason and content of oil dissolved gases of transformer.
为解决在应用油中溶解气体分析方法(Dissolved Gases Analysis,简称DGA)诊断变压器内部绝缘故障时所遇到的主要技术难题,论文提出了用于提高变压器故障诊断准确性和可靠性的数学模型及实现方法,主要研究工作如下:1)提出了一种改进的变压器绝缘故障诊断模糊综合评判方法;进一步提出了将模糊综合诊断与规则推理相结合进行绝缘故障诊断的方法,该方法采用模糊推理对故障原因进行"过滤",滤掉可能性极小的原因,然后进一步利用规则推理验证剩下的可能原因,得出最终结论,大大减少了误判比率,获得了较好的效果。2)根据以变压器DGA数据为特征量的样本空间的c-划分几何特性出发,提出了一种求取样本有效邻域半径和聚类数及聚类中心初值的方法,在此基础上,首次提出了一种自适应加权的变压器绝缘故障诊断的模糊c-均值聚类模型,并设计出故障分类器。3)针对常用灰色关联度的不足,提出了一新的灰色关联度计算公式及确定关联序的准则;并在此基础上,通过深入分析变压器发生绝缘故障时的原因与油中溶解特征气体含量的关系,建立了一种新的故障诊断灰色关联模型;通过实例分析证明,该方法能有效地诊断出变压器绝缘故障及故障部位,大大提高了诊断的准确性。
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The information integrated pattern based on PDM/PLM in the course ofmanufacture is put forward. Under the constraints of building CAPP platform, thearchitecture of CAPP platform is established. The models of decision making andfunction for process planning are given. Then the development means of CAPP basedSmarTeam are extracted.3. The structure of modular product life cycle is established. Toward the divisionand planning of the General Modules oriented product family, theCAD/CAPP integrated model of flexible module based on feature and CAD/CAPPmapping model based on process planning match board are set up. The keytechnologies of Solidworks/SmarTeam/CAPP integration are studies.4. From the point of view of process match board and step match board, theprocess of creating to process planning match board is studied. As an example, themachining process planning of up beam of hydraulic press machines is used tointroduce the establishment of process planning match board by means of inferencebased on expert knowledge. The organize model about the process planning matchboard oriented product family is brought forward.5. The multi-decision methods of CAPP system based on analytic hierarchy aregiven.. On the basis of uniform data model, the sub-machining process planning ofpart is auto-created by means of analytic hierarchy, The step decision methods basedon AHP is put forward.6. For the design/manufacture information in the course of product life cycle, thetree structure based on Object-Oriented and static model based UML are founded. Themethod of establishing design/manufacture information management system isbrought forward. The commercial PLM software—SmarTeam is regarded asdevelopment platform, on basis of which, the design/manufacture informationmanagement system is built, and the multi-view mapping technique ofdesign/manufacture information model is studies.7. A computer-aided CAPP platform based on PDM/PLM is founded, and itsstructure, function, work flow is illustrated. Some example of the system areintroduced.
阐述课题提出的目的和意义,明确了本文研究的主要内容。2、提出基于PDM/PLM的制造过程信息化集成模式;在平台式CAPP系统的设计约束模型基础上,构建了平台式CAPP系统的体系结构;并给出工艺决策模型和功能模型;最后提出基于SmarTeam的CAPP开发模式和实现策略。3、建立模块化产品生命周期模型的组织结构;针对面向产品族的广义模块的划分和规划方法,建立基于特征的柔性模块CAD/CAPP集成模型及基于工艺模板的CAD/CAPP映射模型;研究Solidworks/SmarTeam/CAPP集成的关键技术。4、从工序模板和工步模板的角度研究了工艺模板的创建过程;以液压机上梁模块机加工为例,采用基于专家知识的推理技术实现了工艺模板的创成;提出了面向产品族的工艺模板分层结构树的组织模式。5、提出基于分层规划的多模式工艺决策流程;在统一数据模型的基础上,从特征层和零件层分层规划,实现了零件加工子工艺的自动创成;提出基于AHP的工步排序决策方法。6、针对产品生命周期中的设计/制造信息,建立了面向对象的类树结构和基于UML的静态结构模型;提出基于PDM/PLM软件的设计/制造信息管理系统的构建方法;以商品化PLM软件SmarTeam作为开发平台,开发了基于SmarTeam的设计/制造信息管理原型系统;研究设计/制造信息模型多视图映射机制。7、开发了基于PDM/PLM的平台式CAPP原型系统,构建了系统的功能模型,并对系统的主要功能进行说明,给出系统的运行实例。
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In order to avoid the ill infection, the thesis put forward the countermeasures: changing the government's function, improving the mechanism of evaluation about Levy upon ground and housebreaking, the property exchange should exchange the original address'property. The problem of farmer who loses ground is a serious factor that produces inharmonic society. In order to avoid the ill infection, the thesis put forward the countermeasures: the farmer should be guaranteed by the lowest life guarantees, establishment and perfect the system of farmer's endowment insurance and medicare, establishment and perfect the education and the training mechanisms of farmers who have no ground. The problem of housing that the people who have no money or a little money is the other factor that produces inharmonic society. The thesis put forward the principle of the countermeasures: one is there is house for the people who no money or have a little money for house to live; one is that the countermeasures dont affect the marketization of the housing reform. According to the principle,the thesis put forward the approach:improving on the economical-housing policy,extending low-cost house policy,the rental allowance should mainly for money.
针对西部地区房地产业发展中影响西部地区和谐发展的两大主要因素—征地拆迁和公共住房保障问题进行了专题分析,提出了解决拆迁问题的对策是转变政府职能、改进拆迁评估机制并遵循产权调换应该以原址调换的原则;为解决失地农民长期生活保障,本文提出了把失地农民纳入最低生活保障制度的保障范围,建立和完善失地农民养老、医疗保障制度,建立和完善失地农民的教育和培训机制等主张;针对西部地区公共住房问题,本文提出了使西部地区广大中低收入群众居者有其屋、不影响西部地区房地产改革市场化方向发展原则为解决对策,并提出了在这个原则下的具体解决途径:改进经济适用房政策,扩大廉租房供应对象,廉租房补贴形式以货币补贴为主,让受补贴对象自由选择现有市场存量房或新建廉租住房房源。
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The main viewpoints and model of developing countries MNEs include FDI development cycle put forward by Dunning, the theory of small scale technology put forward by Wells, the theory of localised technological change put forward by Lall, the theory of technological accumulation and industrial upgrade put forward by Tolentino, the model of dynamic comparative advantagr impelling put forward by Aggarwal and Agmon, the model of dynamic competition tactic in technological accumulation put forward by Xian guo-ming and Yang rui.
相对于发达国家工业化早期,发展中国家企业技术能力积累和企业家能力提高具有两方面的有利之处:一是使这种积累和提高由自发过程变为主动过程;二是可以通过政府政策支持对国外相关技术、知识和技能的引进,以及创造更多经济机会和对企业家职能的部分替代或支持,加快企业上述能力积累和提高的过程。
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The content of each part follow as: In the first chapter, as start point and base of the paper, this part focuses on the basic study ofdefinition characteristic of NO, and the existing base of NO-E-Commerceenvironment; In the second one, this part studies the theory base of NO comprehensively applying the theories of core competence competent strategy and transaction cost; Chapter three studies the NO from the coordination of NO, and gives the structure clarification and characteristic of NO firstly, at the same time, put forward the concept of Virtual Enterprise Cluster; Based on such conclusion, studies the model of NO from life cyc organization level process and value chain, and operational mode; In Chapter four, a theoretical explanation was addressed on the above structure by modeling NO with game theory and graphic theory; In the fifth chapter, on the bases of analysis of NO operational risks, coordination mechanism of NO was studied by individually modeling the NO without core and NO with core, and then put forward the solution for coordination mechanism of NO; As an important component of coordination mechanism of NO, Chapter six explored some basic concept of trust and importantly put forward the way of how to build trust in NO, especially investigated the supporting function of valid reputation mechanism of NO for the trust building, importantly an operational method on building reputation mechanism and evaluation method in NO were given; The last chapter applied theconclusion of the paper to investigate the famous trade Web-SUNBU.
全文共分为七章,主要内容如下:第一章作为全文的理论出发点和基础,围绕网络组织的定义、特征以及网络组织生存基础--电子商务环境等方面对网络组织的基本概念进行了阐述;第二章综合运用核心能力、竞争战略和交易费用理论对网络组织产生的理论基础进行阐述;第三章首先从组织协调的角度对网络组织进行了研究,给出了网络组织的结构,分类和特征,同时并给出了虚拟企业群簇;然后在此基础上分别研究了网络组织的生命周期模型、层次模型、过程模型、价值链模型,以及运行模式;第四章综合运用博弈论、图论的相关知识,通过构建网络组织的模型,对上一章所研究的网络组织结构的形成机理给出了一种理论解释;第五章在分析网络组织运行风险的基础上,分别建立无盟主网络组织的博弈论模型和有盟主网络组织的博弈论模型,详细研究了网络组织的协调机制,然后给出了网络组织协调机制的解决方案;第六章作为网络组织协调机制的重要组成部分,本章在讨论了网络组织中建立信任机制的必要性的基础上,研究了网络组织信任关系的类型,提出了在网络组织中如何建立信任机制。
- 推荐网络例句
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The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.
采用不同浓度K2CrO4(0,0.4,0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗,测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。
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By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.
通过分析数学形态学在图像中的理论基础,研究二值图像的形态分析算法,探讨最小结构元素的两种基本形态:膨胀和腐蚀;分析了数学形态学复杂算法的基本原理,把数学形态学的部分并行处理理念引入到家实际应用中。
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Have a good policy environment, real estate, secondary and tertiary markets can develop more rapidly and improved.
有一个良好的政策环境,房地产,二级和三级市场的发展更加迅速改善。