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retrieve parameter
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  相似匹配句对
     estimation of its parameter;
     评定运动模糊的参数;
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     n—Parameter CAPM
     n个参数的资本性资产定价模型
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     Retrieve Knowledge on the Internet
     网际网上的知识获取
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     With SVD method,the data space and parameter space were classed and the effective information wasextracted to retrieve temperatureprofiles.
     将SVD方法应用于卫星资料的温度反演问题中可以将资料空间和参数空间分型,从中提取有效信息来反演大气温度廓线。
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     Retrieve People's Standpoint
     回归人民立场
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Currently the function of operational locust monitoring system mainly focus on after hazards monitoring and assessment, and to find the way effectively to perform early warning and prediction has more practical meaning. Based on two years of 2001 and 2002 continuous field sampling and statistics for 7 phases observation of locusts eggs hatching, nymph growth, adults sample statistics and calculation, spectral measurements as well as synchronously remote sensing data processing,we raise the view point of three...

Currently the function of operational locust monitoring system mainly focus on after hazards monitoring and assessment, and to find the way effectively to perform early warning and prediction has more practical meaning. Based on two years of 2001 and 2002 continuous field sampling and statistics for 7 phases observation of locusts eggs hatching, nymph growth, adults sample statistics and calculation, spectral measurements as well as synchronously remote sensing data processing,we raise the view point of three stage monitor the locust hazards with Remote Sensing. They are:(1) during the egg hitching phase remote sensing can retrieve parameters of land surface temperature ( LST ) and soil moisture;(2) during nymph growth phase locust increases appetite greatly and remote sensing can calculate vegetation index, leaf area index, vegetation cover and analysis changes; (3) during adult phase the locust move and assembly towards ponds and water ditches as well as less than 75% vegetation cover areas and remote sensing combination with field data can monitor and predict potential areas for adult locusts to assembly. In this way the priority of remote sensing technology is elaborated effectively and to provide technique support for the locust monitor system. The idea and techniques employed in the study can also be used as a reference for other plant diseases and insect pests.

当前 ,国际遥感蝗灾监测的技术路线一般是爆发蝗灾后受损面积、程度的监测与评价 ,研究灾害的有效预警与预测方法 ,对防灾减灾更具有现实意义。通过连续 2 0 0 1、2 0 0 2年连续实地对渤海湾夏蝗孵化期、生长期和成虫期等 7个阶段的野外观测 ,对蝗虫生境物理和生物依赖条件样方统计、光谱测试和遥感机理实验 ,提出了“飞蝗生育周期遥感三段监测”的论点 ,根据这个论点将遥感监测设计为 3个阶段 :(1 )孵化期水热条件遥感反演 ;(2 )生长期食量猛增遥感监测芦苇叶面积指数和植被盖度变化 ;(3)成虫期寻找新食源对芦苇盖度 (温度 )和地表水条件 ,进而对聚集条件和迁移方向的分析指导灭蝗。有效发挥了遥感连续动态观测的技术特点 ,为建立环渤海湾东亚飞蝗遥感监测体系提供了基本技术路线 ,介绍的思路与方法也可以对森林病虫害等大规模突发病虫灾害起到借鉴作用

If the frequency difference between two closely spaced components is less than two fast Fourier transform(FFT) resolutions, it is impossible to retrieve parameters precisely by applying ratio-rectifying algorithm directly. As for the double frequency model(DFM), a complex constraint is deduced out between the two frequencies of DFM and the discrete spectrums of three lines nearby the spectrum peaks, which canonically takes on a determinant equal to 0. The iteration based on Newton method is present, and...

If the frequency difference between two closely spaced components is less than two fast Fourier transform(FFT) resolutions, it is impossible to retrieve parameters precisely by applying ratio-rectifying algorithm directly. As for the double frequency model(DFM), a complex constraint is deduced out between the two frequencies of DFM and the discrete spectrums of three lines nearby the spectrum peaks, which canonically takes on a determinant equal to 0. The iteration based on Newton method is present, and some details are discussed. It is shown that this method needs very strict initial values. By setting allowable zone(AZ), this requirement can be related by randomly resetting initial values in AZ after the iteration values move beyond AZ. Except for a few singular points, as long as the initial values are appropriate, the two frequencies can converge to the accured values after about 10 iteration rounds. After two frequencies are estimated accurately, the other parameters, amplitudes and phases can be obtained from another set of linear equations.

对频率间隔小于 2个 FFT分辨率的两个成分 ,直接使用比值校正法精度较差。就双频率模型 (DFM)而言 ,利用谱峰附近三点的频谱可建立一个非线性复约束的 DFM方程 ,它表现为一个复行列式等于零。给出了牛顿法求解该约束的具体格式 ,讨论了迭代的相关细节。研究结果表明 :这种方法对初值要求比较苛刻 ;通过设置容许区间和随机重置初值等措施 ,可减弱对初值的要求 ;除了一些奇异点外 ,若初值选择合适 ,经过大约 10次迭代 ,两个频率可收敛到准确值 ;当两个频率计算准确之后 ,幅值和相位可由另外一组线性关系解出

Regional land surface evapotranspiration research based on 3S technology has become a main(research) direction for there large space,dynamic and easy mapping features.A review is discussed about its theoretical foundation,measurements,models,parameters,and temporal-spatial scaling,and also focuses on some existing problems,such as regional land surface evapotranspiration modeling,its parameters accuracy and the temporal-spatial scale transformation.It is concluded building models based on the physical...

Regional land surface evapotranspiration research based on 3S technology has become a main(research) direction for there large space,dynamic and easy mapping features.A review is discussed about its theoretical foundation,measurements,models,parameters,and temporal-spatial scaling,and also focuses on some existing problems,such as regional land surface evapotranspiration modeling,its parameters accuracy and the temporal-spatial scale transformation.It is concluded building models based on the physical background and the simulation of energy and material exchange in SPAC and using the RS technology to establish key(parameters) would be a trend.On the other hand,combining with 3S technologies and multiple data sources((remote) sensing and DEM data) will reduce non-remote sensing parameters,improve the accuracy of the(retrieved) parameters and temporal-spatial scaling.Further more,it would work on the land surface heterogeneous effect in the field of regional evapotranspiration.

从蒸散测量方法,区域蒸散研究理论基础,模型方法及参数获取,GIS、GPS时空扩展等多个方面对区域蒸散研究进行分析,探讨目前存在的蒸散计算模型、遥感反演模型参数精度及时间空间尺度转换等若干问题。指出以良好的物理基础为背景、以模拟SPAC中能量、物质交换过程并利用遥感技术确定地表关键参数来建立的区域蒸散数值模型是今后的发展趋势。方法上与3S技术紧密结合、多源数据(不同分辨率、不同时序卫星资料及数字高程模型等)结合可以减少模型中的非遥感参数,提高参数的反演精度和时空尺度转换精度,也将对区域蒸散的空间不均匀性问题解决带来希望。

 
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