Prove with elementary method that the curve described by an isochronous pendulum and the fastest falling curve are cycloids.
用初等方法证明等时摆的摆锤所描成的曲线和最速降落曲线都是旋轮线 ;证明在正交的均匀电场与均匀磁场中运动的带电粒子的轨迹也是旋轮线 ;讨论了重力场和正交均匀电磁场中质点的运动之间的类
The occurrences and catastrophes of migratory pests connected with the habitude of their sources, the patterns of migrations, the taking-off and landing mechanisms in most inseparable associations.
迁飞性害虫的发生和灾变与其虫源性质、迁飞规律、起飞降落机制等有着不可分割的联系，而起飞降落机制是这些因子中作用最大的一个，也是决定危害或灾变程度最关键的因素之一。
Large quantity of continuously groundwater pumping in an area forms regional groundwater depression cone,and overexploitation leads to a series of environmental and geological problems.
对地下水资源的长期大量集中开采形成了区域性地下水位降落漏斗,地下水的超采引发了一系列环境地质问题。
After the groundwater in the middle and deep aquifers are exploited for nearly 50 years,regional depression cones in groundwater levels have formed.
文章研究了湛江市50年来的地下水流场变化特征,得出以下结论:市区中、深层承压水经过近50年的集中开采,已形成了以人工开采区为中心的区域水位降落漏斗;浅层水一直未作为集中供水水源,未形成区域水位降落漏斗。
On the basic of predecesser s study,the authors expound the reationship among depression cone radius and piezometric propagationg velocity are caculated in a electrical water source head.
在前人研究的基础上，作者详尽地推导了上部入渗补给为常量情况下的降落漏斗半径和水压力传递速度与时间的关系式，并对某电厂水源地进行了计算。
The average content of Pentosan correlated negatively with thousand grain weight and Falling Number in 5 locations.
5个试点小麦籽粒戊聚糖的平均含量与千粒重、降落值均成负相关关系 (r =- 0 。
The falling numbers and the concentrations of α-amylase inhibitor of 31 spring wheat varieties were determined by falling number method and SDS - PAGE scanning method.
用降落值法和SDS-PAGE薄层扫描法分别测定31个春小麦品种的降落值和α-淀粉酶抑制蛋白的浓度。
Amylose content, swelling power,falling number, sedimentation value and agronomic indexes of 245 wheat germplasm samples were determined.
对 2 45份小麦种质材料的直链淀粉含量、膨胀势、降落值、沉淀值和农艺性状进行了测定 ,分析了淀粉性状与Zeleny沉淀值及农艺性状的关系。
Influence of the Parachute Elastic Behavior on the Canopy Payload;
降落伞弹性现象对伞衣载荷的影响
Analysis of dynamic simulation and fluid field of parachute in inflation stage;
降落伞主充气阶段的动态仿真及流场分析