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At present, although finite element methods is a kind of effective measures in analyzing metal plastically forming problems with friction, dynamic friction in the process of metal forming is substituted with static friction and constant frictional force as one of independent constraint conditions is transposed to equivalent node-load or FEM unit is divided into contact unit and inner unit in numerous studys and applications, so that it result in relative bad accuracy and awkward operation. These defects mostly attribute to the fact that FEM bases on the variational equality principles, however frictional constraint will actually result in variational inequality energy functional.
目前,应用于分析金属塑性成形的有限元法是一种有效的处理摩擦效应的定量计算方法,但是许多应用和研究是用常摩擦来代替金属塑性成形过程中的动态摩擦;把常摩擦力作为单独的约束条件移置到等效结点载荷上或把有限元单元划分成接触单元和内单元,这些将导致解的精度相对不高及实际操作不方便等一系列问题,产生这些不足的重要原因之一在于它的理论基础是变分等式原理。
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Undeniable, in the process of exploration, science and technology is in progress, in fulfilling daily life.
不可否认,在探索的过程中,科技在进步,并落实到了日常生活中。
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It is a trend that school-based training is attached in international in-service teacher education in the process of innovation in school.
在学校改革过程中,重视校本培训是国际上教师在职教育的共同趋势。
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By retrovirus vector the foreign mdr1 gene could be efficiently transferred into bone marrow mononuclear cells of mouse in vitro, and it was confirmed that mdr1 gene was expressing stably and effectively in cells; in short terms there is no significant influence on the bone marrow MNC by transfection of mdr1 gene,but in the long run(in our study we had surveyed 2 months),there is a decline in the expression of apoptosis factor Bax in the MNC which transfected by mdr1 gene,in favour of the recovery of the receptor mouse;on the other hand it also poses a blance problem between multiplication and apoptosis in the process of receptor hematopoiesis after transplanting HSC which was transfected with mdr1 gene.
通过逆转录病毒载体可在体外将外源性mdr1基因转入小鼠骨髓单个核细胞中,转染的mdr1基因能整合到骨髓单个核细胞基因组中并有功能性表达;mdr1基因转入小鼠骨髓单个核细胞在移植后短期内对受体造血细胞没有显著影响,但从长期看来(本研究观察2个月)转染了mdr1基因的造血干细胞的凋亡因子Bax表达降低,更有利于受体鼠造血的恢复;另一个方面它也同时提出一个问题,即mdr1基因转染造血干细胞在回输受体后造血过程的增殖凋亡平衡。
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After examining various aspects of the relations between Margaret and Henry and the nature of the process of her efforts, a conclusion is reached: both Henry and Margaret benefit form her heroic efforts, the latter more than the former. In the process of humanizing Henry, Margaret humanizes and improves herself: she has gradually grown and formed the mature inclusive humanist view, the view of wholeness, balance and harmony.
本文通过探讨玛格丽特对亨利的真爱和怜惜,诠释了她产生帮助亨利愿望的外在环境,分析了她为实现该愿望所做出的种种努力、让步和妥协,并就她努力的意义进行讨论,得出结论:其实,这种类似英雄主义行动的最大的受益者并非亨利,而恰恰是玛格丽特自身,因为正是在此过程中,玛格丽特逐渐抛弃了以往偏激而片面的世界观,通过教化亨利,实现了自我教化,成长为一名真正意义上的人文主义者。
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The exploratory study on the application of MSB reactor with fine particles of Ni based amorphous alloy as catalyst in the process of purification of caprolactam indicated that the hydrogenating efficiency of MSB reactor process was increased 3-5 times, the catalyst consumption was reduced by 50%, and the reactor volume could be reduced, as comp...
以细颗粒镍系非晶态合金为催化剂的磁稳定床反应器用于己内酰胺加氢精制的试验研究表明,与现有釜式工艺相比,加氢效率可提高 3~ 5倍,催化剂耗量降低 50 %,并且可缩小反应器体积。
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Result: Handling with the fresh Herba Andrographis according to current pharmacopeoia's technology, it showed that only dehyandrographolide can be detected. It indicated that the main factor that leads to chemical change is the heating process in the process of production.
结果:穿心莲片按现有的药典工艺生产,穿心莲内酯损失殆尽,只能检测到脱水穿心莲内酯,引致化学变化的主要因素是工艺过程中的加热。
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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。
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The plastic go down the hopper smoothly and is gripped by the thread of the screw. It is forced to go toward the direction of the gear end along with the rotation of the screw. A mechanical transferring process is formed. During the running of the plastic from the feed port to gear end, a high pressure is formed in the process of plastic curing due to the gradual decreasing of the thread depth and the resistance of filter gauze, splitter plate and gear end. The high pressure helps to press the raw material and improve its heat conductivity performance and the quick melting of the plastic, at the same time, the gradual increasing pressure can help the gas which is among material particles exhausted from the air holes.
在压力升高的同时,塑料一方面被外部加热,另一方面塑料本身在压缩、剪切、搅拌的运动过程中,由于内磨擦力也产生了大量的热,在外力和内力的联合作用下,塑料温度逐渐增高,其物理状态也经历了玻璃态--高弹态--粘流态的变化,一般地说来,在加料段中主要是玻璃态,在螺杆螺纹逐渐减少的中间部分压缩段中,物料主要处于高弹状态,同时也逐渐的熔融,而物料到压缩段后部和化段作用处于粘流态了,这时我们称塑料已完全塑化了,由螺杆推力作用将塑化的塑料定压定量的从机头中挤出。
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It studies the variations of deformation modulus, P wave velocity and acoustic emission in the process of rock fracture by cycle loading. Further, it is considered that the occurrence of earthquake outside Lijiang seismic area made the forced process changed, therefore, the Lijiang M7 earthquake came later, the impending precursory anomalies became unclear or complicated, and the magnitude decreased.
用循环加载研究岩石破裂孕育过程中变形模量、纵波速度和声发射的变化特征,进而探讨认为丽江地区外部地震的发生使受力过程发生了变化,从而使丽江7 级地震延迟发生,也使临近地震的前兆异常不明显或更复杂,并使丽江地震震级减小。
- 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。