查询词典 periodic

The permanence of a class of periodic predator-prey system where the prey disperses in patchy environment was studied.

研究了一类周期捕食与被捕食系统的持久性，其中食饵在斑块环境中扩散。

Therefore, periodic cleaning and disinfecting ventilating systems and hygienic surveillance should he strengthened to prevent emporiums and supermarkets from pollution of fungus.

提示有关单位应加强对大型商场和超市空调通风系统的定期清洗和消毒处理以及卫生学监测，防止真菌污染危害。

The history is very important and the diagnosis may often be made on to alone. Periodic epigastria pain occurs after meals, discomfort from a gastric ulcer being noted half to one hour after food whilst the stomach is still full, gradually passing off as the organ empties, or relieved by vomiting.

对于消化性溃疡患者，病史也很重要，而且往往仅依据病史，即可作出诊断，胃溃疡患者常在饭后出现上腹周期性疼痛，这是因为当食物仍在胃里时，由于胃溃疡而产生不适感觉，不适感随胃排空而慢慢消失或因呕吐而减轻。

That is, we can use a combination of biological (periodic releasing naturalenemies) and chemical tactics that eradicates the pestto extinction, and show the efficiency of IPM strategy.

也就是通过引入周期脉冲捕杀一定比例的害虫或喷洒杀虫剂杀死一定的害虫和周期投放一个常数天敌来控制害虫。

American officials keep saying that they are keen to build a more "mature" and "strategic" relationship with China, one better able to withstand the inevitable periodic fallings-out.

美国官员表示，他们期盼和中国建立更加&成熟&、更具&战略意义&的关系，这一关系最好能经受住往后必定会出现的时不时的争执。

After reform up to now 20 come for years, the economic fluctuation of our country is the periodic and fluctuant configuration that a kind of demand finalizes the design definitely, the supply decision before be different from reform completely already.

改革后至今20多年来，我国的经济波动是一种需求决定型的周期波动形态，已完全不同于改革前的供给决定型。

And the formulized expressions of the linear complexity of the periodic sequences obtained are given.

所谓稳定性是指在有限传输差错时，序列的周期与线性复杂度均不发生退化，否则将该周期序列作为密钥流序列是极不安全的[1]。因此，序列的

Periodic impounding and draining of the water reservoir would be implemented after the projects were in service.

在水库工程运营后，将按计划进行周期蓄、排水。

This method allows for a more accurate processing of boundary condition on the semiconductor layer in XLPE cable of stator winding than the standard finite element, so that the interlaminated issue of boundary condition on interface can be avoided. A general algorithm is applied to deal with both the Dirichlet and the periodic boundary condition in 2D or 3D magnetic field problem.

提出了用有限元法计算磁场问题时周期性边界条件和第一类边界条件的统一处理方法，利用该方法在不改变代数方程组阶数、保持系数矩阵性质不变和带宽基本不变的条件下，使两种强加边界条件能同时处理，简化了程序编制，并与寻址方法相结合，提高了计算速度。

I've been experiencing periodic lapses in concentration.

我正经历间歇性的集中力降低。

By policy, the police impolitely sliced the politician's p olitics books.

根据政策，警察无礼地将政治家的政治书籍切成薄片。

An overview was made on study and application of storage and fresh-keeping technique of Ginkgo seed, as well as effect of chemical, physical and biological treatment on seed.

就银杏种核贮藏保鲜技术的研究和利用进行了综合评述，介绍了银杏采后化学、物理、生物等方面的种核贮藏保鲜技术，并详细说明了冷激、热激、辐射及臭氧处理对银杏种核的保鲜作用，同时对其它相关的主要新兴贮藏保鲜技术在银杏上的应用进行了分析和展望。