查询词典 frame rate
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This project studies the scale-dependent deformation behavior of the metal matrix composite, the void nucleation and void growth mechanisms at the micron/submicron scale. The main results are:(1) In prophase, growth and coalescence of the void embedded in the graded matrix are analyzed in detailed;(2) Based on the infinite solid model containing a micro-void, coupling effects of the void shape and the void size on the void growth are studied carefully, the results show that it seems to exist a critical equivalent void radius, which is associated with the material length. When radius of a microvoid is close to or smaller than the critical void radius, the micro-void growth rate is essentially eliminated;(3) The coupling effects of the particle shape and size on the mesoscopic stress fields within the particle and matrix are also investigated by introducing the conception of inclusion/matrix interfacial energy. The results show that the stress concentration factors within the particle and on the matrix/particle interface are also strongly size-dependent,so the void nucleation mechanism is size-dependent.(4) By employing a specific orthogonal curve coordinate frame and a 'kernel function' conception, a 'unified method'solving the spheriodal and spherical void problems is suggested; by this unified method, size-dependent plastic potentials of the porous materials containing the spheriodal or spherical voids are obtained, which extend the traditional Gurson model for the spherical void and GLD model for the spheriodal voids to the micron scale.(5) Based on the RVE model containing the spheriodal or spherical particles, the influences of the particle shape and size on the size-dependent mechanical behavior of metal matrix composite are studied.
中文摘要:本项目对金属基复合材料在微细观尺度下的尺度相关变形行为、孔洞形核及长大的机理和模型进行了研究,取得了如下主要结果:1)在前期研究中,探讨了基体的梯度分布对孔洞长大和聚合的影响;2)基于含孔洞的无限大体模型,探讨了孔洞形状和孔洞尺寸对其长大的耦合作用,结果表明:可能存在一个与材料特征长度相关的临界孔洞尺寸,当椭球孔洞的等效半径小于临界孔洞半径时,孔洞的长大受到明显抑制;3)通过引入基体/夹杂界面能的概念,分析了夹杂尺寸、夹杂形状对材料细观应力场的耦合影响,结果表明:颗粒内部和界面上的应力集中因子强烈地依赖于夹杂的尺寸和形状,因此,孔洞的形核机理是尺寸相关的;4)采用一种特殊的正交曲线坐标系和引入"核函数"的概念,"统一"地得到了含椭球和球形孔洞的材料的尺寸相关塑性势,它将传统的Gurson球形孔洞模型和GLD椭球孔洞模型推广到微尺度范围;5)基于含椭球和球形夹杂的体胞模型,初步研究了夹杂形状、夹杂尺寸对金属基复合材料尺寸相关力学行为的影响。
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On the other hand, it is exemplified in the present paper that the principle of material frame – indifference with the admissible equivalent dynamic processes of a body by Truesdell and Noll (1965) [14] is more convenient than the form-invariance of constitutive functionals by Svendsen and Bertram (1999) [13] and Liu (2004)[4], especially for the rate-form constitutive equations.
通过例子说明了Truesdell和Noll 用等价动力过程,关于物质标架无关性原理的陈述,比Svendsen 和Bertram及Liu的本构关系在参考标架变换下的形式不变性更合理且方便,尤其是对微分方程形式的本构关系更是如此。
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In the proposed frame of theory, probability density function or distribution function are also involved, but their standing are secondary. Probability density function is treated only as a probabilistic features of the failure rate function.
在本文倡导的理论体系中,也要涉及概率密度函数或分布函数,但他们仅被视为失效率函数的概率特征,讨论的路线是失效率函数的模式如何决定寿命分布的概率性质。
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One buffer points to the present video frame, which is sent to the display at a certain refresh rate.
一个缓冲器区指向目前的视频帧,该帧被以一定的刷新速率送到显示器上。
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The absorbing rate remained unchanged in some time. It was confirmed that the reclaimed water can be used for the effective purification of tenter frame exha...
用循环水对染整定型机废气喷淋洗涤,在一定时间内有较高的净化效率,并且可以降低水的消耗量,同时有效减少二次污染的产生。
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Taking Changling County, Zhenlai County and Da'an City of Jilin Province as researchareas, based on remote sensing data, graphics operation and spatial analysis are carried out indifferent points of views, including temporal, spatial, scale and landscapeetc; all aspects analysis of this dissertation are abstractively expressed by digital graphics andseries of curves which are not stick to one pattern to discussing multi-dimension andcomplicated attributes of the salinized process. Linking up temporal-spatial characteristicswith landscape indices while combining mathematics model and Geo-informatic TUPUmodel, this dissertation puts forward the fundamental frame: temporal-spatial evolvementpattern, spatial extension process analysis and landscape characteristics analysis of salinizedland. Temporal-spatial evolvement pattern analysis extracts the essential quantity features andtransformation modes of salinized land, and also analyzes patches spatial geometricalparameters scale feature; spatial extending process analysis discusses the change rate andecological modes; landscape feature analysis utilizes landscape graphics indices to describesalinized land microcosmic graphics features and changes.
信息图谱模型为土地盐碱化研究提供了一种谱系化、定量化与定位化相结合的研究方法,本文选取吉林省西部盐碱化典型区域长岭县、镇赉县、大安市作为研究区,以遥感影像为基础数据,在GIS技术支持下,从时空变化、尺度效应、景观特征等多个角度对盐碱化土地进行图形运算、空间分析,通过不拘一格的数字化图形、曲线系列抽象表达出不同维度上的特征与规律,探讨土地盐碱化过程的多维性与复杂性,将盐碱化土地时空特征与景观特征衔接、数学模型与图谱模型结合,以盐碱化土地时空演变基本模式、空间扩展过程和景观特征分析为框架构建盐碱化土地信息图谱模型研究体系,发挥图谱模型数据挖掘、知识发现的特长,将宏观动态变化与微观特征相联系,进一步挖掘土地盐碱化过程与人类活动影响的关系,为探索研究区盐碱化土地成因、过程,预测其未来发展变化趋势及其对环境影响提供相关科学依据。
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Compared to the traditional reciprocating pumps, it is more compacter in frame, smaller in size, lighter in weight and lower in flow capacity pulsation rate, and so on.
除具有传统往复泵的基本优点之外,还具有结构更加紧凑、体积更小、重量更轻、效率更高、脉动更小等优点。
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The influence of adhesive flow rate of high-speed automatic folder gluer on the adhesive layer thickness was studied. The influence of colloid adhesive viscosity, pressure, and diameter and position of Gel pores was simulated and tested using Navier-Stokes equation as the frame and CFD problem solving technique.
针对高速糊盒机喷胶流量对胶层厚度的影响,以Navier-Stokes方程为框架,运用计算机流体动力学求解技术,对胶体粘度、压力、胶孔直径大小和位置相互之间的影响进行模拟和实验,找出规律。
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The regurgitant volume was calculated by temporally integrating the instantaneous flow volume rate of each frame during systole.
建立了基于经食道旋转扫描二维和经胸实时三维超声多普勒血流图像获取方法和图像插值、配准算法获得体数据,经多维重建描述二尖瓣反流速度的空间分布,立体观察返流的时相、方向、反流束长度、面积、体积、空间传播和严重程度等;通过重建反流后的速度场,从血流动力学角度分析了二尖瓣反流的性质,计算偏心反流束的湍流强度,利用反流束角度和湍流强度对计算结果进行修正;基于实时三维彩色多普勒成像技术,利用控制体原理对二尖瓣反流束在反流瓣口横断面的速度分布进行空间与时间积分获得二尖瓣偏心性反流的每搏反流量。
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Due to traverse motion unstable problem of riderless bicycle,simulating dynamics characteristic on human riding bicycle,and adequately using parallel mechanism s merits such as compact frame,great rigidity,rapid response rate and great loading capability,a traverse adjustment method of riderless bicycle based on 2-RHR redundantly actuated parallel mechanism was presented.
针对自行车机器人运动的侧向不稳定性,模仿人骑自行车的动力学特征,充分利用并联机构的结构紧凑、刚度大、响应速度快、承载能力强的特点,提出了一种基于2-RHR型冗余驱动并联机构进行自行车机器人侧向稳定调节的方法,系统地阐述了并联机构侧向调节方式的可行性和优越性。
- 推荐网络例句
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For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether
年美国个人破产法的一个改动使得破产登记急速下降,而后引起了信用卡大规模的亏损。
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Eph. 4:23 And that you be renewed in the spirit of your mind
弗四23 而在你们心思的灵里得以更新
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Lao Qiu is the Chairman of China Qiuyang Translation Group and the head master of the Confucius School. He has committed himself to the research and promotion of the classics of China.
老秋先生为中国秋阳翻译集团的董事长和孔子商学院的院长,致力于国学的研究和推广。