threshold population的例句大全

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。

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A threshold effect exists in single population dynamic system.

单种群动力系统存在种群大小的阈值效应；

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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。

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The correlation between bone density and fracture and the threshold limit value of bone mineral density to screen population at high risk of fracture

骨矿含量与骨折相关性及其骨折危险阈值研究

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The threshold limit value of SOS to screen the population at more than 20% risk of fracture in men and women was 3950m/ s.

如果以骨折危险性高于20%为骨折高危人群，则男女性骨质疏松性骨折阈值为3950m／s。

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The threshold limit value ( TLV) of bone mineral density to screen the population at more than 20% risk of fracture in men was 0. 58g/ cm2, and the TLV in women was 0. 54g/ cm2.

以骨折危险性高于20%为骨折高危人群，则男性骨折危险阈值为0.58g／cm2，女性骨折危险阈值为0.54g／cm2。

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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。

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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

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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

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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。

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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。

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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。

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The simulated results indicate that there is a threshold of migration ratio in the migration of different genotypes influencing the resistance evolution of pest population.

模拟结果表明，迁入比例对害虫种群抗性演化的影响存在一定的阈值。

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The calculated threshold temperature is found to be in good agreement with the experimental laser-starting temperature, which indicates the resonance radiation trapping is a significant factor in establishing the population inversion of the resonance to metastable transition lasers.

发现计算得到的阈值温度与实验报道的开始产生激光的工作温度一致，表明共振辐射俘获效应是这类激光形成粒子数反转的一个重要机制。

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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；

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it also showed that the ecologic management system could keep the bph population completely below the economical threshold.

所组建的生态措施组合可将褐稻虱种群数量降至经济阈值以下，完全可达到持续控制褐稻虱种群的目的。

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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。

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Using the latest parameter's data of Yb-Er co-doped Al2O3 films, the results show that Yb3+ co-doping can increase photoluminescence intensity and population inversion and lower the threshold power.

利用Yb-Er共掺Al2O3薄膜的相关数据进行模拟计算，结果显示Yb的掺杂可提高Er3+的荧光强度和反转粒子数，并使实现粒子数反转的阈值泵浦强度最大可降低一个数量级。

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Economic threshold for this pest insect was estimated by measuring the increasement rate of population density.

并提出用害虫种群潜在密度确定卷叶螟经济阈值的方法。

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