We discuss the variational assimilation principle,and prove the characteristics of the adjoint equation.
本文概述了变分同化伴随方程理论研究的重要性,讨论了变分同化原理、证明了预报模式方程的伴随方程解的特性;提出了建立伴随方程的分解技术,通过二维浅水波方程的伴随方程的建立,研究了建立伴随方程的数学方法。
By effectively utilizing the error characteristics of background field and observation vector, one-dimensional variational assimilation retrieval technique (1D-VAR) can overcome this difficulty, and furthermore, may improve the quality of retrieval atmosphere profile.
合理利用背景场和观测量的误差特性,变分同化反演技术可以克服这个困难,并改进反演剖面的质量。
Considering various factors related to the predictability, we numerically compare the harmonized multi-time difference scheme (HMTDS) with the variational assimilation.
在一个简化气候模式的混沌态上,针对影响实际预报准确度的多种因素,将协调多时次差分格式与提为时间演变的变分同化进行了全面的比较。
The regularization method of inverse problem is used in combination with the variational data assimilation method to adjust the model initial/boundary conditions and parameters so that the analyzed model can agree with the observation.
针对修正的风海流Ekman模型,采用变分同化技术结合反问题的正则化技巧,对模式的初始条件、边界条件和模式参数进行最优调整,使模式解与观测场能较好地符合。
The generalized variational data assimilation for non-differential dynamical systems is studied.
讨论了不可微预报系统中的广义变分同化方法· 对于不可微预报系统,由于不可微性,系统不存在切线性系统,而切线性系统的不存在,使得无法用通常的途径导出伴随系统· 引进不可微系统的弱形式后,可以不考虑切线性系统,而直接导出伴随系统· 主要就3种形式的问题展开了讨论,第1种为低维系统,第2种情形为高维系统整体观测资料,第3种情形为高维系统局部观测资料· 可以称此方法为结合反问题思想的广义变分同化方法·
Background error covariance is very important to assure exclusive result, to govern the amount of smoothing of the observed information and to decide relationships between different variables in variational data assimilation.
在变分同化方法中，背景误差协方差矩阵对保证变分问题解的唯一性及分析的平滑性，反映不同变量之间的关系有着非常重要的作用。
The model can be used to predict the mass loss and composition change of the melt.
利用该模型计算得到了1373K时Cu-Zn熔体挥发过程中熔体成分及挥发速率的变化,同时得到了熔体质量损失与保温时间的关系,与采用热重法得到的Cu-Zn熔体失重曲线进行了比较,两者变化规律一致,说明所建立的模型可以用来预测组元挥发损失量及带来的成分变化。
With laser beam welding,the effects of component changes in the seam on the microstructure transformation and on the mechanical character is researched,and the reasons of porosity formation (or cavity)in TC4alloy weld were studied.
采用激光焊接TC4钛合金,研究了焊缝成分变化对组织转变和焊缝机械性能的影响,分析了焊缝中气孔(或空洞)形成的原因。
It is proved that various degree of micro component changes occur during the liquor storage depending on the degree of alcohol and the period of storage.
为适应成品白酒在一定的贮存(包括货架期)期内,理化指标继续符合国家标准和产品风格的稳定,应采取:更新勾调理念、根据企业运行情况确定贮存时间、按微量成分变化结果设计产品的微量成分。
Four-dimensional Variational Assimilation Experimentation of Bogus Data for a Typhoon Case
台风Bogus资料的四维变分同化试验
Theoretical Research on Some Problems of Variational Data Assimilation Method, Variational Optimization Analysis and Hydrodynamical Stability
变分同化、变分最优分析及流体动力稳定性中若干问题的研究
The Application of 4D-VAR Assimilation Technique to Typhoon Analysis
四维变分同化方法在台风风场分析中的应用
Study and Implementation of Parallel Variational Data Assimilation;
气象资料变分同化的研究与并行计算实现
The Parallel Computing of Adjoint Models of Variational Data Assimilation in Numerical Weather Forecasting;
数值气象预报变分同化的伴随模式并行计算
Variational Assimilation of ATOVS Data and Its Application for Numerical Prediction of Heavy Rainfall;
ATOVS资料的变分同化及在暴雨预报中的应用研究
A Study on the Application of Genetic Algorithms to Variational Data Assimilation for Meteorology;
遗传算法在气象资料变分同化中的应用研究
The Study of Component-based Four-dimensional Variational Data Assimilation System and Its Framework Implementation;
基于组件的四维变分同化系统研究与框架实现
Accompanying the biochemical, metabolic, and visceral changes are a series of endocrine alterations.
在生化、代谢以及内脏发生变化的同时，还有一系列的内分泌变化。
Effect on changes of flavor constituents in flue-cured tobacco leaves under different aging conditions
不同陈化条件对烤烟烟叶香气成分变化的影响
Seasonal Changes of Chemical Compositions in Different Organs of Tilia mandschurica
糠椴不同器官若干化学成分的季节性变化
Effects of Different Water Stress on Antioxidative Index in Rice Hybrid B You 827
水稻苗期不同水分胁迫下抗氧化指标的变化
Changes in Major Chemical Components of Flue-cured Tobacco During Different Field Growth Stages
烤烟田间不同生育期主要化学成分的变化
Chemical Components in Culms of Different Variation Types of Phyllostachys nigra
紫竹不同变异类型的竹材化学成分分析
Comparative Analysis on Meat Components of Jiudingshan Chicken (Gus gallus) of Different Month Ages and Different Sex
九顶山鸡不同月龄肉质成分及变化趋势分析
The distribution of the fatty acids in milk fat varies considerably with the seasons, mainly as a function of changes in diet.
乳脂肪中脂肪酸的分布随季节变化有所不同,主要与膳食变化有关。
The Comparative Study on Ultrastructure and γ-tubulin of the Vegetative Cell and Resting Cyst of Euplotes Encysticus;
包囊游仆虫不同时期超微结构变化及γ—微管蛋白分布变化
The Study on Dynamic Change and Prediction of Soil Water Content under Different Sand-fixing Modes on Shifting Dune;
不同固沙模式土壤水分动态变化及预测研究