Until now, many biologists have assumed either that the Y chromosome was headed for eventual extinction, or that its evolutionary downslide was largely over and it has sunk into stagnation. 到如今,许多生物学家认为Y染色体最终不是走向灭绝,就是连退化也停止最终陷入沉寂。
In the past, the general level of English in Singapore was obviously superior to all in Asia, however in the recent years the situation has shown a downslide degradation influenced by the regionalisation tendency. 新加坡的英文水平在亚洲是有目共睹的,但近年来地方化的影响,其水平有逐渐下降的迹象。
The motor critical speed for sliding particles and the vibrating effect parameters such as original phase, stable phase, downslide displacement and upward slide displacement in each cycle, average feed speed for sliding particles in varying motor speed conditions are calculated by programming in this paper. 编程计算了能使颗粒滑动的电机临界转速和不同电机转速状况下颗粒滑动的原始相位、稳定相位、每周期内的下滑位移、上滑位移、平均推进速度等振动效果参数。
The downslide force can be increased with the seepage force in slope mass as the seepage, which has a bad effect on the stability of slope. 渗流作用下坡体内渗透力产生的同时也会导致下滑力增加,对边坡稳定性造成负面影响。
Physical model tests on influence of pipe drainage system on slope residual downslide thrust 管网渗流系统对边坡剩余下滑推力影响的物理模拟研究
The test results verify that groundwater pipe drainage system in pebbly-clay slope can markedly improve the soil permeability, drawdown the groundwater level, therefore decrease the slope residual downslide thrust and increase the slope stability. 试验结果表明,管网渗流系统可提高坡体的渗透性,降低地下水位,从而使边坡剩余下滑推力明显减小,从而提高边坡的稳定性。
First, the classification of the highway slopes, the mechanism of the downslide, the principles and measures to remediate the highway slopes have been analyzed. 本文首先阐述了公路高陡边坡的分类、发生机理、治理原则和措施。
The paper briefly introduced cutting downslide velocity calculation, computing method and theoretical basis for lagged time, and value picking method for cutting equivalent diameter. 简介了岩屑下滑速度的计算及滞后时间计算方法以及理论依据,简介了岩屑等效直径的取值方法。
Mechanical model of single-support downslide and multi-support downslide as well as the problem of the tipping resulted from the downslide of the support are studied. 对大采高支架单架下滑、多架下滑力学模型,以及由于支架下滑而发生支架倾倒的问题进行了研究。
Objective To study the relationships of the structure and function of the heart and the downslide of carbohydrate-resisting. 目的了解糖耐量低减与心脏结构及功能的关系。
The downslide force before the anti-slide pile and that behind the anti-slide pile under the critical condition and the maximal load-sharing ratio between the pile and the soil are obtained by the carry-over factor method. 利用传递系数法计算出临界状态下抗滑桩前后土体的滑坡推力,进而计算出最大桩-土荷载分担比;
Through examples, the paper analyzed and demonstrated that by making use of cutting equivalent diameter calculating downslide velocity, the accurate correction can be taken to cutting lagged time. 通过实例,分析论证了可以用岩屑等效直径计算下滑速度,对岩屑迟到时间进行精确校正。