中值
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This paper presents an IFMC CAD model that consits of a geometry model and a material model, in which the geometry space acts as a base space and the material space acts as a bundle space. In this CAD model, the geometry model is based on the non-manifold model. In addition, a half-face data sturucture, which is derived from the half-edge data structure with the non-manifold feature of IFMC taken into account, is adopted to represent the geometry and topology information of the component.For the material model of IFMC, this paper focuses on the FGM component representation firstly and present a simplex-subdivision based CAD data exchange format, in which the material information is represented as a (n-1) simplex and material .distributing feature is represented by the interpolation on the simplex-subdivision. Based on those, a part-building orientation optimization algorithm and an adaptive slicing algorithm for FGM component are presented in the paper.For the IFMC material model, the IFMC material information representation is divided into a meso-scale and a macro-scale representation. In the meso-scale, a concept named parameterized periodic functional meso-structure is presented as a unique form to represent the FGM (the homogeneous materials are regarded as a special FGM), the composite and the functional meso-structure material. The model of PMS is a three-tuple that contains the space stateinformatation, the material parameter and the material meso-scale distribution feature. The macro-scale material information representation is similar to the FGM components by interpolation of the control parameter of the periodical functional meso-structure based on the simplex-subdivision.Through an example of manufacturing-oriented IFMC CAD data processing, it is proved that the IFMC CAD model and the material information representation and process method proposed in this paper can provide a reliable data support for IFMC digital concurrent design and manufacturing.
本文将理想材料零件CAD模型建立在以几何空间为底空间、以材料空间为丛空间的结构上,使用非流形几何模型作为理想材料零件几何拓扑模型的基础,并在半边数据结构基础上,针对理想材料零件的非流形特征局限内部边界上的特点,给出了一个半面数据结构来表述零件的几何拓扑信息;对于理想材料零件的材料模型,本文先从功能梯度材料零件的信息表述与CAD数据交换和处理入手,将材料信息表述为(n-1)维单纯形,然后通过对三维几何区域的单纯剖分,以插值的方式表述零件材料分布特征;在此基础上,根据功能梯度材料零件分层制造中对CAD数据处理的要求,给出了综合考虑零件几何特征与材料特征的生长方向优化算法和自适应切片算法;而对于文中所定义的理想材料零件,本文将其材料信息表述分解到细观和宏观两个尺度进行,首先给出了细观尺度上参数化的周期性功能细结构概念,以此来统一表述功能梯度材料(单质材料作为特殊的功能梯度材料看待)、复合材料和功能细结构材料;把周期性功能细结构模型化为一个包含空间状态信息、材料构成参数和材料细观分布特征参数的三元组,以表达零件的细观材料特征;对于零件宏观的材料变化特征,则同样在几何区域单纯剖分的基础上,通过对细观尺度上周期性功能细结构控制参数的插值来完成;通过理想材料零件CAD数据处理的算例,验证了本文中理想材料零件CAD模型及材料信息表述与处理方法完全可以为理想材料零件的数字化制造提供可靠的数据支持。
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The means and their standard deviation of carboxyhemoglobin contents in the blood from finger and ear were calculated in 5 groups divided according to the earboxyhemoglobin contents in finger blood.
结果与分祈根据62名受检者指血与耳血中COHb%的测定值绘制成散点图,散点从左下方向右_L方分布,表明指血与耳血中CoHb%测值之间存在着正相关,其回归方程为Y=0 。0418+0.9542xr=0.9675
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Active oxygen is found to be involved in apoptotic progress affected by exogenous SOD and measurement of SOD in cell sap. Arsenic compounds cause a decrease of SOD in cell. It is exactly the decrease that make plenty of active oxygen gather in mitochondria, and starts the apoptotic progress. The analysis of SOD values shows that active oxygen has an effect on apoptosis.
通过加入外源性SOD和对胞液SOD的测量,发现胂化物引起细胞凋亡的过程,有活性氧的参与,并且胂化物还导致细胞内SOD值的减少,正是由于这种降低,才导致了细胞内特别是线粒体中活性氧大量聚集,启动了细胞凋亡过程,通过对SOD值的分析,证明了活性氧在细胞凋亡中的作用。
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It has a long history to study on the problem of best restricted range approximationin a space of real-valued continuous functions on a closed interval, while the corresponding problem in a space of complex-valued continuous functions on a compact metric space was just introduced in recent years.
三。实值连续函数空间中最佳限制值域逼近问题的研究有较长历史,而复值连续函数空间中相应问题的研究却是近几年来的事情。
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After the biomechanical finite element analysis for the three-dimensional reconstruction model, we find the structure of the deformed nose showes the following characteristics: 1, Nasal septum, nasal columella, lateral feet of nasal alar, lateral nasal dorsum are stress concentrated regions, that is the key mechanical positions of deformed nose; 2, Under the static state, nasal deformation has a very small value of stress distribution, under displacement load status, the deformed nasal has a large value of the stress distribution; 3, Ipsilateral nasal columella are the the key mechanical parts of deformed nasal rectify. And lateral nasal alar is also the most stress concentrated areas.
对于重建后的单侧唇裂鼻畸形鼻部模型进行有限元生物力学研究,发现畸形鼻的力学结构呈现以下特点:1、鼻中隔、鼻小柱、鼻翼外侧脚、鼻背外侧是单侧唇裂鼻畸形应力分布的集中部位,也就是畸形鼻部的力学关键部位;2、在静态状态下,畸形鼻部拥有的应力分布值很小,在位移载荷状态下,形变后的畸形鼻部拥有的较大的应力分布值;3、单侧唇裂鼻畸形整复中,鼻小柱患侧部是畸形整复的力学关键部位,其次就是患侧鼻翼部。
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Because Horn-clause logic theory is of significance in both respects of theory and application, We especially studied lattice-valued Horn-clause logic with truth-value in lattice implication algebra, and the soundness and completeness theorem have been proved.
经典逻辑中,Horn子句逻辑理论具有广泛的应用,因而,本文中特别建立了基于格蕴涵代数的格值-类Horn子句逻辑,并证明了可靠性和完备性定理,这为建立一类基于格值逻辑这种非经典逻辑的人工智能语言将产生重要的作用。
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Longitudinal and correlated data are commonly modeled with generalized linear mixed models which contain both fixed and random effects. The source of the random effect may come from the genetic heredity, familial aggregation, or environmental heterogeneity. The inference of its variance component is usually difficult due to the dimension of its covariance matrix and the complexity of the likelihood function.
在生物医学统计中常接触到具有相关性的资料,这些相关性可能是基因、环境、重复测量或是时间所造成的;在这一类型的研究中,我们通常不只对治疗的效用有兴趣,观测值的变异以及观测值之间的相关性亦可能是我们所关注的量,这些变异或相关形式都可以被称为变异数成份。
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Python knows a number of compound data types, used to group together other values. The most versatile is the list , which can be written as a list of comma-separated values between square brackets.
Python 了解几种复合数据类型,用于分组其它值,最有用的是* list*,可以写做中括号中的一列用逗号分隔的值。
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Molecular conformation calculations were made for two possible conformers(eclipsed and staggered with respect to the methyl group)of the compound Calculated results show that:the stable conformer of pyruvic acid is the eclipsed one;The BLYP/6-31G* and scaled HF/6-31G* frequencies correspond well with each other and with available experimental assignment of the normal vibrational modes.
结果表明:在丙酮酸分子的两种构象中,重叠式比较稳定*B3LYP计算得到的构型参数与实验结果比较一致;在振动频率的计算中,BLYP未标度力场所计算的非CH3伸缩振动基频预测值和实验值的平均绝对偏差为10.4cm-1;而HF标度力场的平均绝对偏差为17.9cm-1。
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According to Lemaitre's damage evolution law and the assumption of this paper that the cyclic loading maximum tensile stress has the most contribution to the cyclic damage and assume that the stress is the maximum stress .The material parameters S which are expressed in exponential form and generalize the variation in the process of cyclic loading is exponential experience equation which provide the expectation of cyclic damage of 63Sn/37Pb material and lead it into the calculation of damaged incremental form and assume that damage keeps constant during the same cycle. The results match the experimental data. It proves that the Endochronic plasticity theorem adopt the calculation of damage environment.
根据Lemaitre损伤演化律及本文假设循环负载下拉应力在最大值附近对循环损伤的贡献最大,文中应力对各循环之损伤而言假设应力为最大拉应力,将材料参数S以指数型式表示,归纳出疲劳损伤在循环负载过程中的变化为指数型经验式,提供63Sn/37Pb材料在循环负载作用时损伤情况的预测,并引入含损伤增量式内涵时间之计算中,假设同一循环的损伤为定值,其计算结果与实验数据吻合,说明内涵时间塑性理论亦适用於损伤环境下的计算。
- 推荐网络例句
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Do you know, i need you to come back
你知道吗,我需要你回来
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Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.
1〕 杨银书,王祥生,李德昌。安徽省首次发现嗜群血蜱。
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Chapter Three: Type classification of DE structure in Sino-Tibetan languages.
第三章汉藏语&的&字结构的类型划分。