threshold population

Based on the present production level of wheat, the wheat price and the level of cost for the aphid control in Hebei, the economic threshold for the aphid population would be 600 and 650 at early and middle milking stages respectively.

根据河北省当前小麦产量水平，商品价格及防治现状和费用计算，小麦长管蚜的经济阈值，在灌浆初斯为600头，中期为650头。

互联网摘选

It needs us to deal with the relationship of the WT and environment protection correctly, to define the threshold population of WT, to forecast environmental capacity of WT.

这就要求我们正确处理湿地旅游发展和环境保护的关系，确定湿地旅游的门槛人口，预测湿地旅游环境容量，在开发和保护并重的基础上，不对湿地环境构成危害。

互联网摘选

The results show that when the wave vector with parallel to the interface exceeds the damping constant and the field strength exceeds a certain threshold, the population of interfacial optical phonons grows with time.

研究结果表明：当平行于界面的波矢超过衰减常数，场强超过某一阈值时，界面光学声子数随时间指数增加。

互联网摘选

The cumulative action of effective temperatures above the developmental threshold ( 15 ℃) during the borer's overwintering period was a major factor affecting diapause termination in the borer. The total effecive temperatures for the borer population were about 267.5 day-degrees.

15℃以上的有效温度的累积作用是滞育解除的主导因子，其群体临界有效积温约为267.5日度。

互联网摘选

The threshold of diversity for locust population out breaks and their control in grassland ecosystems;

蝗虫种群暴发的多样性阈值与草原生态系统的调控；

互联网摘选

The rate equation formalism is used to develop the concepts of laser threshold, population inversion and modulation response.

比例方程式形式用来生成雷射临界点、能态数反转与调变反应的概念。

互联网摘选

While the population size exceed presetting threshold, the population size decrease to original state. Then, to solve discrete optimization problem, PSO algorithm is modified to discrete one.

当种群规模超过预先设置好的阈值时，将种群规模降为初始状态。（2）为求解聚类问题，将PSO算法修改为离散化PSO。

互联网摘选

First, this paper constructs a SIQS epidemic model that incorporates constant recruitment and a general population size dependent contact rate. A threshold parameter cis identified.

首先建立了一类具常恢复率，有效接触率依赖于总人数的SIQS传染病模型，并得到了阈值参数σ的表达式。

互联网摘选

A referential norm of blue/ yellow perimetry threshold for normal population

正常人群蓝、黄视野阈值的参考标准

互联网摘选

The concept on the economic threshold of pest population and it's mathematical model

害虫种群经济阈值的概念及其数字模型

互联网摘选