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Based on the foregoing analysis, the critical condition of realizing ductile/brittle transform is confirmed, and then, the model of ductile grinding of engineering ceramic is built.
以陶瓷材料压痕断裂力学、线性断裂力学和微观断裂物理学为理论基础,系统的分析和讨论了磨削加工过程中微裂纹的产生机理及其影响因素,建立了裂纹分布模型,并根据位错产生微裂纹机制,对磨削过程微裂纹的形成采用位错塞积模型来描述,从能量平衡的角度,讨论位错裂纹的稳定性与磨削应力的关系,确定了材料脆性去除和塑性去除转换的临界条件,最终建立以此为基础的工程陶瓷材料延性域去除模型。
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What is worse, such self-imposed reticence proves to be extremely detrimental to the artistic achievement of the novella, for, without in-depth delineation of female sexuality, the novella is at best a farce-like character sketch that verges on nothing more than a showcase for the failed, absurd escapade for university students to enact their aspiration to serve their country by committing ridiculous espionage conspiracy.
更糟的是,这种自我沉默是极其吗有害的中篇小说的艺术成就,因为没有深入的描述女性的性欲,中篇小说充其量是个farce-like人物素描,濒临一无所有超过一个展示的失败,荒谬的冒险为大学生制定吸尘为国家服务承诺荒谬的间谍同谋。
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The results show that the flow stress decreases with increasing deforming temperature and increases with increasing strain rate. The flow stress of the alloy during hot compression deformation can be described by constitutive equation in hyperbolic sine function with a hot deformation activation energy of 196.27 kJ/mol. Partial recystallization takes place in the alloys deformed at a high temperature or at a low strain rate, and large number of dislocations and subgrains are observed in the alloy. The elongated grains observed in the samples coarsen with increasing temperature and decreasing strain rate. Correspondingly, the subgrain size increases and the dislocation density decreases. The main soften mechanism of the alloy transforms from dynamic recovery to dynamic recrystallization.
结果表明:Al-Cu-Mg-Ag耐热铝合金在热压缩变形中的流变应力随着温度的升高而减小,随着应变速率的增大而增大;该合金的热压缩变形流变应力行为可用双曲正弦形式的本构方程来描述,其变形激活能为196.27kJ/mol;在变形温度较高或应变速率较低的合金中发生部分再结晶,并且在合金组织中存在大量的位错和亚晶;随着温度的升高和应变速率的降低,合金中拉长的晶粒发生粗化,亚晶尺寸增大,位错密度减小,合金的主要软化机制逐步由动态回复转变为动态再结晶。
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This paper takes time as the main line to describe the history of development of the state-owned railway and the joint venture railway in the Inner Mongolia, and divides the development process into three stages and draws maps for each stage. It also takes the longest joint venture railway-JiTong railway as the mail part and describes its preparation, construction, operation and performance of corporational process and also explores the problems of the entire process.
本文以时间为研究主线详细叙述了内蒙古自治区境内国有铁路和合资铁路发展的历程,并首次将内蒙古铁路发展过程分为三个阶段且每个阶段都通过铁路网图描述;以我国营业里程最长的集通铁路为研究主体,详细论述集通铁路筹备、建设、运营业绩以及集通铁路有限责任公司的企业化过程,将其运营历程分为两个阶段和一个至高点,并探讨整个过程中取得的成绩和存在的问题。
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More specifically, we describe our solution for securing credential migration that we're developing for productization.
更具体地说,我们描述我们的解决方案,为确保认证移民,我们正在发展为产品化。
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First, select four kinds of main risks source from bigly celebrate the main risk in region source, namely the flood, drought, sand-dust weather and petroleum pollution accident, etc. According to the different a request for to habitat, study this 19 kinds of landscapes ecosystem type of the Regional induce for 7 kinds of ecosystems system: Then the marsh of bulrush, lakes and reservoirs , salt alkali wasteland, prairie, island form wood, farmland, town. The difference is proceeded by characteristic according to each type ecosystem to the analysis of four kinds of main risks source, including the certain risk all rate, delimiting the space distribute, analyzing the risk strength to the receptor etc. At proceed the revelation the different from endanger to analyze the inside, this text borrows ecosystem index number that this index sign to reflect primarily habitat the ecosystem meaning of the type of habitat the different from position, with weak an index number to show the destructibility of the habitat, from but compute each ecosystem that is lost by ecosystem system an index number.
首先,从大庆地区主要的风险源中遴选出四种主要的风险源,即洪涝、干旱、沙尘天气和石油污染等;依据不同生物类群对生境的要求,将本研究区域的19种景观生态类型归纳为7种生态系统:即芦苇沼泽、湖泡库渠、盐碱荒地、草甸草原、岛状林、农田、城镇;对四种主要风险源的进行分析,包括确定风险概率,划定空间分布,对风险受体的作用强度分析等;在进行暴露和危害分析中,本文主要借生态指数这一指标来反映不同生境类型的生态意义和地位,以脆弱度指数来体现不同生境的易损性,从而计算出各受体生态系统的生态损失度指数;由于各主要风险物质对风险受体的作用强度是不同的,对形成区域性生态风险的作用大小也有差异,因此本文采用层次分析法对主要生态风险物质进行综合评价,并把判断矩阵排序权值的合理计算问题归为—非线性化问题,并提出用基于遗传算法(GA[5])的层次分析模型进行权重分析;进行风险表征,即综合前面两个阶段的信息,对环境中风险的性质和强度以及风险评价过程中不确定性问题进行分析与描述,并划分出五级生态风险区;最后,根据划分的五级生态风险区的特征,分别提出针对各生态风险区的生态风险管理对策。
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To facilitate the practical application, some simple rules are summarized to indicate the optimal selection rule among the ones known so far, under different circumstances. 4 Through clearly describing the uncertainties in stochastic simulation optimization and deterministic complex optimization, a unified formulation is proposed for the two types of optimization problems.
为方便工程应用,总结出一些简单规则,指出各种情形下的目前已知最优挑选规则。4通过明确刻画随机仿真优化与复杂确定性优化问题中的不确定因素,为两类问题提供统一描述。
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I hold that the popular "left" deviationist thinking lay a solid social foundation for the wide dissemination of Marxism and the establishment of Left-wing discourse system. With different thought such as reminiscence and rebellion behind it, the anti-urban tendency was defined successfully by Leftists as the token of Leftism.
我认为当时左倾作为一种普遍性的社会思潮为马克思主义的广泛传播和左翼话语体系的确立提供了广泛而丰厚的社会基础,反都市倾向虽然有怀旧和反叛等不同的思想背景,但是都被左翼成功地定义为左倾思想的表征,我将这一现象作为基本的思想背景进行了分析和描述。
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The features of this dissertation are lie in: a The concept of"Influence Distance"was presented to quantitatively express"corner effect", systematicly studied on the influence of all factors on"influence distance". It could provide reference to angle designing from the view of heat treatment; b Deeply studied on the influence of shape factor to carbon concentration field. It could provide reference to gear designing from the view of heat treatment; c New model was set up to describe the two-dimensional concentration field of carbide dispersion carburizing. The shortcomings of"effective diffusion constant method"and"equilibrium constant method"were overcome in this model.
本文的特色在于:①提出了用"尖角影响距离"定量描述"尖角效应"的方法,并系统研究了各种因素对"尖角影响距离"的影响规律,从热处理角度为工件尖角部位的设计提供依据;②首次深入研究了齿轮的各种形状因素对浓度场的影响,从热处理角度为齿轮设计提供依据;③建立了能够更有效地模拟过饱和渗碳浓度场的数学模型,该模型克服了"有效扩散系数法"及"平衡常数法"的不足,与"最小自由能法"可互为补充。
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The data analysis shows that: 1 different texture parameters have a clear scattered distribution, 2 the main direction of texture is the direction represented by the maximum parameter of Gauss-MRF parameters, and 3 for those samples basing the same main direction, the finer the texture is, the greater the corresponding parameter is, and the smaller the other parameters are; and the higher the order of Gauss-MRF is, the more clearly the texture is described.
数据分析表明,各不同纹理特征参数之间具有明显的分布性;Gauss-MRF参数值最大的参数所表示的纹理集聚为向为纹理的主方向;对于纹理主方向相同的样本,纹理越细致,其相应参数越大,而其他参数越小;Gauss-MRF阶数越高,纹理描述越细致:在2阶Gauss-MRF模型情况下,弦切纹理的B1参数大于径切纹理的B1;弦切纹理的B2、B3、B4分别小于径切纹理的B2、B3、B4。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.
这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力