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Iff σ/G takes the classical power form A (σ/G)″, n is shown to increase from 4.7 to 8.8 with σ/G, and is more properly replaced with a hyperbolic sine law.


In this paper, a discontinuous statefeedback law is proposed for the stabilization of nonholonomic systems in power form.


The shortrange overlap potential is considered in the BornLandé inverse power form.


The shortrange overlap potential is considered in the BornLandé inverse power form.


The shortrange overlap potential is considered in the BornLandé inverse power form.

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 Spinning power in the ring frame is dealt with in three respects: 1. A general concept of spinning power in ring frame is discussed. Power consumption is claimed to be composed of seven parts such as that caused by traveller friction and that caused by air resistance in ballooning, with the former accounting for the greatest proportion. 2. A method for measuring instantaneous spinning power is devised. The measuring results reveal some important laws concerning spinning power, namely... Spinning power in the ring frame is dealt with in three respects: 1. A general concept of spinning power in ring frame is discussed. Power consumption is claimed to be composed of seven parts such as that caused by traveller friction and that caused by air resistance in ballooning, with the former accounting for the greatest proportion. 2. A method for measuring instantaneous spinning power is devised. The measuring results reveal some important laws concerning spinning power, namely (A) During one lift of the ring plate, the spinning power consumption is larger at the shoulder than at the nose; (B) The varying winding diameter and balloon height lead to a power distribution during one doffing cycle, with the maximum at the completion of cop bottom build motion and the minimum at the nose of the doffing position, and (C) The spinning power forms an exponential function, varying 2.12.6, to the balloon height. 3. The ways are found to reduce spinning power consumption, as by modifying ring and traveller, chaging the form of thread guide movement or reducing the mean height of the balloon.  本文包含了下面三部分的内容: 1.对环锭细纱机纺纱动力的基本概念进行了讨论。纺纱动力是由七部分的动力消耗所组成,其中钢丝圈的摩擦功率占有最大的比重。 2.提出了瞬时纺纱功率的测试方法,并利用该法在高速、纺中支纱的情况下,对纺纱动力进行了测定,得到了一些重要的结论:①在钢领板升降动程中,大直径纺纱功率大于小直径纺纱功率;②在一落纱中,纺纱功率的大小具有一定的分布。最大功率发生在成形结束大直径时,而最小功率发生在大纱小直径时;③在实际纺纱中,纺纱功率是气圈高度的指数函数,其指数的变化范围为:2.1—2.6。此外,对锭速与纺纱功率的关系,钢丝圈重量与纺纱功率的关系也作了测定与讨论。 3.讨论了减少纺纱动力消耗的途径:①通过设计新型钢领钢丝圈来减小一落纱的平均张力;②通过改变导纱钩的升降型式来降低一落纱的平均气圈高度。  Based upon an analysis of the relationship between patrameters of the weight function of the negative power form and the capability of locating blunders, it is found necessery to handle separately the choice of the basic variable of the weight function and the test value for statistical tests. The result of investigation shows that the socalled "enlarged residual" should be used as the basic variable of the weight function for the first two iterations, and it is better to choose the residual itself for... Based upon an analysis of the relationship between patrameters of the weight function of the negative power form and the capability of locating blunders, it is found necessery to handle separately the choice of the basic variable of the weight function and the test value for statistical tests. The result of investigation shows that the socalled "enlarged residual" should be used as the basic variable of the weight function for the first two iterations, and it is better to choose the residual itself for the following. The "Standardized residual" is used as the statistical test value, while the power value of the weight function is taken from  2.5 to  4.0.  本文研究了幂函数型权函数的参数与定位粗差能力的关系。提出了权函数基本变量的幂取值范围为2.5～4.0;计算权的基本变量对于第1,2次迭代用“放大余差”,以后则用余差;对余差进行统计判断的统计量采用“标准化余差”。  The hydraulic conductivity both in unsaturated and saturated soil after freezingthawing cycles has been determined in laboratory. Results show that the hydraulic conductivity of unsaturated soils is in relation to saturation degree (or water content) and soilwater potential in the power form. It decreases quickly with decreasing water content and increases with increasing dry density. The hydraulic conductivity decreases with increasing fineness content while the water content and the dry density are... The hydraulic conductivity both in unsaturated and saturated soil after freezingthawing cycles has been determined in laboratory. Results show that the hydraulic conductivity of unsaturated soils is in relation to saturation degree (or water content) and soilwater potential in the power form. It decreases quickly with decreasing water content and increases with increasing dry density. The hydraulic conductivity decreases with increasing fineness content while the water content and the dry density are the same. The hydraulic conductivity of saturated soil after thawing is greater than that before freezing and its increment is greater in finegrained soil than in coarsegrained soils after one freezing and thawing cycle and is also greater in the soil with greater dry density. After several freezing and thawing cycles, the hydraulic conductivity is slightly increased, compared with that experienced one freezing and thawing cycle.  通过室内试验,得出非饱和土壤的导湿系数是其含水量与土水势的指数函数,且随含水量的降低而快速降低。并对影响导湿系数的干容重、土类、含水量等因素进行了分析与讨论。饱和土冻结融化后,其导湿系数均大于冻前,经历数次冻融后,导湿系数每次都略有变化,但基本趋于一常数。   << 更多相关文摘 
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