历史查询   





 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 
The onedimensional heating problem of multilayer bodies and its exact mathematical solution, which is derived here for a doublelayer body, is of great importance in many technical fields.


An iterational algorithm for solving the selfheating problem is suggested based on the thermoviscoelastic model and the equations describing the piezoelectric effect.


Observations show that the solar coronal heating problem is highly complex with many different facts.


In the approach adopted here, we have adapted the energy considerations used in the surface heating problem to describe the competition between the stabilizing effect of fresh water and the vertical mixing brought about by tidal and wind stirring.


Furthermore, part of the coronal heating problem appears to have been solved with recent observational support for the Converging Flux Model in which heating is produced by coronal reconnection driven by footpoint motions.

 更多 


 The workerpeasantsoldier students have undertaken the task of making a new prototype product of an electric spindle of high power rating. In the stages of design, fabrication and test, the viewpoints of dialectical materialism are firmly insisted on. Lots of contradictions in connection with the task are analyzed and so there comes the conclusion that the temperature rise is the principal contradiction. In order to limit the temperature rises and thermal strains resulted therefrom, suitable measures are... The workerpeasantsoldier students have undertaken the task of making a new prototype product of an electric spindle of high power rating. In the stages of design, fabrication and test, the viewpoints of dialectical materialism are firmly insisted on. Lots of contradictions in connection with the task are analyzed and so there comes the conclusion that the temperature rise is the principal contradiction. In order to limit the temperature rises and thermal strains resulted therefrom, suitable measures are taken to suppress the overheating due to preloading and poor lubrication of the bearings and the electrical losses etc. and significant results are then obtained. The method of forced cooling by fluid convection along a helical path in the jacket of the electric motor is adopted in order to facilitate the heat dissipation. Based on the results of analyses and experiments, the new prototype product of electric spindle has been successfully made. The temperature rises and thermal strains are all within normal limits when the spindle runs continuously at high speed. Other characteristic features are also found satisfactory.  本文叙述工农兵学员在大功率电主轴的设计、试制和试验中，坚持辩证唯物主义的观点，分 析了试制电主轴的各种矛盾，找出了主要矛盾──温升。针对温升和由它引起的热变形，在主轴 轴承的预紧、润滑和电机损耗等发热问题上采取了一系列措施，取得了明显的效果。同时在外壳 采用了流体沿筒壁螺旋线受迫对流式的冷却，以加强散热。 根据以上分析和试验而试制成功的电主轴在高速运转时，温升和热变形都比较正常，其它各 项性能指标也都比较理想。  In this paper, the heating problem in brakes of cranes is studied and the weakness of method now being used to check heating of brakes is presented, meantime, a new method calculating the temperature directly is given out to deal with the heating problem. Then, we analyse the temperature condition in brakes, and present that the experimental study js necessary; It is also included to analyze how the braking delay time affects the braking energy and the temperature cdndition. Finally, taking the φ500 brake as... In this paper, the heating problem in brakes of cranes is studied and the weakness of method now being used to check heating of brakes is presented, meantime, a new method calculating the temperature directly is given out to deal with the heating problem. Then, we analyse the temperature condition in brakes, and present that the experimental study js necessary; It is also included to analyze how the braking delay time affects the braking energy and the temperature cdndition. Finally, taking the φ500 brake as example, the method how to realize the temperature condition simulation on an inertia rig and select properly the test parameters is showed.  本文对起重机用制动器的发热问题作了研究和探讨,指出了目前采用的发热验算方法之不足,提出了直接求解制动器的温度来处理其发热问题.接着分析了制动器的温度工况,指出实验研究的必要性.此外,分析了制动滞后时间对制动能量和温度工况的影响.最后以(?)500制动器为例,说明了在惯性试验台上实现制动器温度工况模拟和正确选取试验参数的方法.  The design of electrode structure for cigarettepaper perforator,its material and the selection of working parameters concerned to discharge have beendescribed in the article.An equivalent capacitive impedance of Z■100kΩ isused as the actual load in doing experiment. For discharge of pin to pin electrode,the qualified cigarettepaper with70100 coresta can be got at paper speed of 100150m/min.Electrode heatloss should be improved further.  本文介绍了用于卷烟纸打孔机的电极结构设计,材料及放电参数的选择。采用等效阻抗Z=100k(?)的电容性负载,针对针的放电形式在车速,为100—150m/min条件下,可以打出透气度为100—70Coresta的合格卷烟纸。但电极的发热问题还需作进一步改进。   << 更多相关文摘 
相关查询  


