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two component LDV SYSTEM WITH DUAL-DIFFERENTIAL ACOUSTO-OPTICAL FREQUENCY SHIFT AND ITS APPLICATIONS

Acta Mechanica Sinica 1986年第1期2卷 81-92页

作者： Shen Xiong Zhang Jingyi Wang Zongsen Yu Hesheng (Department of Engineering Mechanics,Tsinghua University) Department of Engineering Mechanics Tsinghua University Beijing China

This paper describes the main properties of the two component LDV systemdeveloped with the dual-differential frequency shift *** has the advantages ofmultiple functions,better *** high utilization of *** it offers as a completetechnique and method for measuring 2-D complex *** applying this system,2-D turbulentseparated flow measurements have been made in a duct with an asymmetrical suddenexpansion and in a wind tunnel flow over a 2-D *** Reynolds numbers were at 5900 and 4500respectively.

关键词： laser doppler velocimetry frequency shift two component

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Discussion of Present Isotopic Hydrograph Separation （IHS） Method

Discussion of Present Isotopic Hydrograph Separation （IHS）...

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2009 International Conference on Environmental Science and Information Application Technology

作者： Weimin Bao State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing P.R.China Tao Wang Haiying Hu Simin Qu State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing P.R.China

Runoff sources and dominant flow paths are still poorly understood in most ***,isotope hydrograph separation methods are widely used to improve our understanding about runoff *** hydrograph separation（IHS）is based on the mass balance equation of water flux and isotope tracer *** isotope analysis machine（for example,mass spectrum） available can only get theδ-value of the isotope *** analysis is presented for quantifying the error in two-and three-component tracer-based hydrograph *** analysis compared the error between ratio balance method and mass balance method in computing mixed fractions to determine which method is more *** the ratio balance method,the ratio of isotope tracer in used in concentration mass balance equation;comparatively,in the mass balance method,the concentration of isotope tracer is used in the same *** studies about two-and three-component tracer-based hydrograph separation are used to illustrate the application of the *** of the abundance of rare isotopes are so negligible,the difference between two methods is small in the isotopic hydrograph separation *** scientific research,it is not appropriate to substitute ratio for concentration in the isotope tracer concentration mass balance ***,we recommend the use of mass balance method in the application of isotope hydrograph separation research to improve the degree of accuracy.

关键词： isotope hydrograph separation(IHS) two component three component ratio balance method mass balance method

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