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The interpolate algorithms of three-order NURBS curve and double three-orders NURBS surface are presented. The expressions of partial derivative and normal curvature of NURBS surface are derived by the theory of differential geometry. The geometric characteristics of different curvature area of the free-form surfaces are analyzed in detail. All these work lays a theoretical foundation for constructing the cutter location calculating model of free-form surfaces NC machining. 2 On the basis of analyzing the methods of cutter path generation, the standard of evaluating the various methods of cutter path generation is presented. The method of generating cutter path with constant scallop height is presented for the first time.
本文以提高复杂曲面多坐标数控加工精度和加工效率为目的,在对国内外研究现状进行深入分析的基础上,对数控编程中各环节的关键技术问题进行了深入研究,主要内容包括以下几方面: 1 分析了复杂曲面各种造型方法的优缺点,给出了根据各种边界条件所确定自由曲面的NURBS表示方法以及三次NURBS曲线曲面反算算法;用微分几何理论推导了NURBS曲面的偏导矢及法曲率计算表达式;对曲面不同曲率特性区域的几何特征进行了深入分析,为建立复杂曲面的数控加工刀位计算模型奠定了理论基础。
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For regular topology surface, intermediate surface local texture mapping are used; for irregular topology surface, subdivision surface local texture mapping are used. So different topology surface using different texture mapping methods can solve the contradiction between texture effect and processing speed when they are dealt with by single method. The three judge conditions of texture distortion in the process of mapping onto the sphere surface are discussed and the exiting algorithms of mapping are analyzed, the new algorithms of mapping onto the sphere surface are presented. In order to enhance the realistic of graphics, a new function of wood texture is presented. OpenGL is also introduced in this papers and some realization examples of texture mapping based on OpenGL under the environment of VC++ and POV-RAY are presented in some chapters.
对于简单拓扑表面,利用改进的两步纹理映射,对于复杂拓扑表面利用新的面片分割算法,初步解决了颜色纹理中速度与走样之间的矛盾;通过对球面纹理时纹理不变形的三个判断条件的研究,分析了现在各种球面纹理映射算法,并在此基础上提出了一种基于等面积的半球面纹理映射算法,明显减少了球面纹理的纹理变形;针对现有的木纹纹理中,两种表示木纹的颜色差距表现出的颜色突变问题进行研究,提出对这两种颜色进行线性插值或二次插值,使生成的木纹纹理颜色更加连续,更加逼真;在VC++环境下,通过调用Open GL的图形库及在Pov-Ray软件环境下,实现了参数化纹理、球面纹理、凹凸纹理及木纹纹理等各种算法。
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The TLC of them were concordance.They presented the same color fluorescence in the corresponding position at the ultraviolet light(365nm). After the vanillic aldehyde sulphuric acid ethanol solution developed, violet color spots presented at the same place. Reference substance of Polysaccharide presented violet color ,but in the corresponding position the crude and the prepared didn't show the spots . It proves that the chemical constituents of Polygala Root may not have changed after stir-baked with honey.
生远志正丁醇部位色谱和蜜远志正丁醇部位色谱基本一致:紫外灯(365 nm)下二者在相应位置呈相同颜色荧光,香草醛硫酸乙醇溶液显色后二者在相应位置的几个斑点均呈紫罗兰色,且远志皂苷元对照品斑点呈紫罗兰色,而在与其相应位置生远志供试品和蜜远志供试品均未检视到相应斑点。
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The measurement system error model analysis is introduced into power system real time network state analysis as an important part for the first time, which can improve on the state estimation quality and provide the capability to monitor the operation of the measurement system; 2. The theory and algorithm of the on-line estimation and update of measurement noise variance based on the relation between the residual variance and noise variance. The statistic properties of the sample variance are discussed and the relation between the estimation precision and sample size under given confidence level is derived; 3. The theory and algorithm of detection and identification of measurement bias are presented, which is based on the relation between residual mean and noise mean. The statistic properties of sample mean are discussed and the relation between estimation precision and sample size is derived; 4. The Givens orthogonal transformation algorithm is selected to be the essential algorithm of state estimation, the fast orthogonal transformation algorithm with damp factor and the algorithm which can handle the zero injection measurements efficiently are presented; 5. The quantity analysis theory of bad data detectivity and identifibility are presented, which describes the relation between the elements in matrix W〓 and bad data amplitude and can provide the theory base for measurement system design and valuation.
一、首次将量测系统误差模型分析做为一个环节引入电力系统实时网络状态分析中,为EMS系统增加了实时监视系统运行、修正量测系统误差模型的新功能,进一步发挥了实时网络状态分析应用软件的潜力;二、首次提出了应用样本方差在线估计与修正量测系统误差方差的基本理论,讨论了样本方差的统计性质和概率分布,推导出了样本容量、估计精度和置信度之间的关系,给出了在线估计与修正量测系统误差方差的算法;三、首次提出了应用样本均值在线检测与辨识量测偏差的基本理论,讨论了样本均值的统计性质,推导了样本容量、估计精度和置信度之间的基本关系,给出了在线检测与辨识量测偏差的算法;四、在状态估计算法设计中,以Givens变换算法做为基本算法,提出了快速正交变换阻尼因子法和可以有效地处理零注入量测的混合法,并对实时应用中的一些问题进行了讨论;五、提出了不良数据可检测性与可辨识性的定量分析理论,揭示了描述量测系统配置、网络结构与参数的残差灵敏度矩阵中的元素与不良数据的幅值在可检测、可辨识能力上的定量关系,为量测系统配置设计与评价提供了理论基础;六、综合国内外最新研究成果,采用自适应自回归预测技术和稀疏矢量技术,构造了较完善的不良数据检测与辨识算法。
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The fundamental imaging features of osteosarcoma were showed bone destruction, periosteal reaction, neoplastic bone and soft-tissue mass. Among 49 cases examined by radiography, osteoblastic pattern sarcoma was found in 19 cases, osteolytic pattern sarcoma was found in 13 cases and mixed pattern sarcoma was found in 17 cases. The detection rates of bone destruction, periosteal reaction, soft-tissue mass, neoplastic bone and Codman triangle by radiography were respectively 61.2%, 95.9%, 71.4%, 73.5%and 27.7%. All 10 cases with CT scan were showed bone destruction, soft - tissue mass and neoplastic bone. The detection rates of periosteal reaction,憇ieve sign挶 and Codman triangle with CT scan were respectively 90%, 90% and 11%. The tiny neoplastic bone and"sieve sign"were showed sensitively by CT, but Codman triangle was showed by radiography superior to CT.32 cases with MRI scan presented the normal marrow was replaced by the tumor, which was showed low to intermediate signal intensity on T1-weighted images and promiscuity signal intensity on T2-weighted images. 7 cases presented hemorrhage and 24 cases presented necrosis.
骨肉瘤基本影像表现为骨质破坏、骨膜反应、瘤骨和软组织肿块。49例X线表现为成骨型19例,溶骨型13例,混合型17例;X线对骨质破坏、骨膜反应、软组织肿块、瘤骨和Codman三角的检出率分别为61.2%、95.9%、71.4%、73.5%和27.7%;10例CT表现均可见骨质破坏、软组织肿块及瘤骨,CT对骨膜反应、筛孔征和Codman三角的检出率为90%、90%和11%;CT对显示细小肿瘤骨和筛孔征最敏感,但对Codman三角的显示不如X线平片;32例MRI表现为骨髓腔内正常的骨髓高信号被肿瘤信号所取代,T1WI呈低~等信号,T2WI呈混杂信号,7例合并出血,24例中央坏死囊变,32例增强扫描均呈不均匀强化及瘤周可见水肿区。
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A mean age was 11.3 months (range from 2d to 13 years old). 31.87% of them presented symptoms in the infant period. Main symptoms were vomiting and upper abdomen pain. Midgut volvulus presented distention and tenderness. Intestinal gangrene presented haematemesis and melena.
诊断主要依据出生3~7天后量胆汁样呕吐,腹部立位平片及上消化道气钡造影、钡剂灌肠,B超、CT、MRI亦有意义。
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To simplify the comparison of symmetrical triangular fuzzy numbers, through the analysis to the satisfactory degree function of fuzzy numbers presented by Tanak, a simple and convenient formula for comparing two symmetrical triangular fuzzy numbers is presented, and the limitation of the formula presented by Liu Xinwang is proved.
为简化正规三角模糊数的比较。通过分析Tanaka提出的模糊数比较的满意度函数,得到了2个正规三角模糊数比较的简便公式;指出了刘新旺提出的模糊数比较公式的局限性。
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Synthetically considering these characteristics, the method of freeway management and control are presented according to four aspects: system objective orientation and concept design, system demand and requirement analysis, system data management and network structure, traffic control and accident detecting theory as well as its application. Function and structure of system are delimitated from the point view of integration. Construction and function demand of subsystem are analyzed and basic implement projects are presented. In this thesis, system data flow and management method and target which based on system network topology structure and equipment demand are described. Traffic modeling ideology and the process of making dynamic model as well as accident detecting program are presented with centralized and distributed traffic control theory in detail, then freeway ramp control theory which based on predictive model and its theoretic pattern are explored. Finally, based on the object oriented programming, program of accident detecting and checking on freeway is developed by using visual C++ as tool.
论文综合考虑高速公路交通管理系统的上述特征,分别从系统目标定位及概念设计、系统需求分析、系统数据管理及网络结构分析、交通控制与交通事件检测理论与应用四个层面,对高速公路交通管理与控制问题进行了系统阐述,界定了系统的功能及各功能的实现要求,并从系统集成角度划分了系统的结构;分析了各子系统的信息、功能、建设等方面的需求,给出了基本实施方案要求;对系统数据流程进行了描述和梳理,提出了数据管理的方法、目标及措施,分析、设计了系统网络拓扑结构及设备需求;阐述了交通模型的建模思想和动态交通模型的建立过程,对集中式和分散式全局交通控制理论进行了详细的分析,提出了基于预测的高速公路匝道控制理论,并对理论模式及相关的问题进行了研究,分析了高速公路事件检测系统,并采用面向对象的编程思想,以Visual C++为编写工具,开发了高速公路事件检测系统分析软件。
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The TLC of them were concordance.They presented the same color fluorescence in the corresponding position at the ultraviolet light(365nm). After the vanillic aldehyde sulphuric acid ethanol solution developed, violet color spots presented at the same place. Reference substance of Polysaccharide presented violet color ,but in the corresponding position the crude and the prepared didn't show the spots .
生远志正丁醇部位色谱和蜜远志正丁醇部位色谱基本一致:紫外灯(365 nm)下二者在相应位置呈相同颜色荧光,香草醛硫酸乙醇溶液显色后二者在相应位置的几个斑点均呈紫罗兰色,且远志皂苷元对照品斑点呈紫罗兰色,而在与其相应位置生远志供试品和蜜远志供试品均未检视到相应斑点。
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The dynamics model of missile sealifts system for navy ships connected parallely is established. The dynamics simulation analysis of system is studied. The dynamics characteristic of missile box on the condition of different sea states and place parameters of crane are analyzed. The theory and technology bases for the design of system of missile sealifts or navy ships connected parallely are presented. The controlled multibody system dynamics of the system of missile sealifts with wave compensation for navy ships connected parallely is presented. On the condition of stochastic momevement of depot ship and incept ship and under the action of sealifts and wave compensation, the dynamics of sealifts system is studied by using discrete time transfer matrix method of multibody system. The calculate method of electric machine impule is developed in the process of supplying missile and action of wave compensate. Based on the PLC control system, the control method, which control supply process by testing torque of guide strings is presented.
本文建立了舰艇并靠导弹补给动力学模,进行了舰艇并靠导弹补给及波浪补偿系统动力学仿真分析,获得了导弹箱在不同海况下和舰用起重机不同位置参数的运动规律,为舰艇并靠导弹补给系统设计提供了理论依据和技术基础;建立了舰艇并靠导弹补给及波浪补偿受控系统多体动力学,在补给舰和被补给舰随机运动下,在补给和波浪补偿系统作用下,应用多体系统离散时间传递矩阵法进行了补给系统动力学分析,得到了导弹补给过程中,波浪补偿时,导引电机和卷扬电机输入电机脉冲计算方法;建立了以PLC 控制系统为核心,用扭矩传感器测量导引带产生的扭矩来控制补给过程的控制方法;对系统振动问题进行了研究,提出了通过调整伺服电机参数减少系统振动的方法。
- 相关中文对照歌词
- Cuando Limpia El Humo
- I Can't Get Started
- Dear Ms. Leading
- I Can't Get Started
- Ear To Ear
- I Can't Get Started
- Just For Me
- Altered States
- Tye Dye The Night
- Laughing With
- 推荐网络例句
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Pradeep Indulkar, a senior official at the Maharashtra state Home Ministry say 101 human were killed and 287 injured.
马哈拉施特拉邦内政部高级官员Pradeep Indulkar称,有101人在冲突中丧生,287人受伤。
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Mark Frei, a senior vice president of West, says 80% of West's homeagents have some college education, compared with 30% of those whowork in office-based call centers.
Frei说,该公司80%在家办公的人员都拥有本科学位,而在公司电话中心工作的人中只有30%拥有本科学位。
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Based on the application of grey forecasting control theory on the hybrid d cable-stayed bridge, the paper puts forward construct control system of the hybrid cable-stay bridge by cantilever assemble construction.
将灰色系统理论和预测控制理论应用于混合梁斜拉桥,提出了悬臂拼装施工的混合梁斜拉桥施工控制体系。