搜索结果: 136-150 共查到“理学 techniques”相关记录194条 . 查询时间(0.062 秒)
The application of data mining techniques for the regionalisation of hydrological variables
regionalisation floods catchment characteristics data mining
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2009/3/17
Flood quantile estimation for ungauged catchment areas continues to be a routine problem faced by the practising Engineering Hydrologist, yet the hydrometric networks in many countries are reducing r...
Evaluation of artificial neural network techniques for flow forecasting in the River Yangtze, China
Artificial neural network multilayer perception
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2009/3/17
While engineers have been quantifying rainfall-runoff processes since the mid-19th century, it is only in the last decade that artificial neural network models have been applied to the same task. This...
The construction of confidence intervals for frequency analysis using resampling techniques: a supplementary note
Bootstrap Jack-knife frequency analysis maximum likelihood method maximum product of spacings method
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2009/3/11
In a recent contribution, Hall et al. (2004) examined the use of the Bootstrap resampling technique as a means of constructing confidence limits for the quantiles of the (two-parameter) Gumbel and the...
Ground-based intercomparison of two isoprene measurement techniques
Ground-based intercomparison isoprene measurement technique
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2009/3/10
An informal intercomparison of two isoprene (C5H8) measurement techniques was carried out during Fall of 1998 at a field site located approximately 3 km west of Boulder, Colorado, USA. A new chemical ...
Irregular Grid Finite-Difference Techniques：Simulations of Oscillations in Shallow Circular Basins
Irregular Grid Finite-Difference Techniques Oscillations Shallow Circular Basins
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2009/3/7
Finite-difference techniques for irregular computational grids are presented. Successful simulations of transient normal mode oscillations in shallow circular basins, where analytic solutions are know...
The construction of confidence intervals for frequency analysis using resampling techniques
Bootstrap Jack-knife frequency analysis maximum likelihood method maximum product of spacings method
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2009/3/5
Resampling techniques such as the Bootstrap and the Jack-knife are generic methods for the estimation of uncertainties in statistics. When applied in frequency analysis, resampling techniques can prov...
Radar rainfall image repair techniques
ground clutter data infilling Ordinary Kriging nearest neighbours Singular Value Decomposition border tracing computation time ground level rainfall estimation
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2009/3/5
There are various quality problems associated with radar rainfall data viewed in images that include ground clutter, beam blocking and anomalous propagation, to name a few.
Inverse modeling of CO2 sources and sinks using satellite data: a synthetic inter-comparison of measurement techniques and their performance as a function of space and time
CO2 sources synthetic inter-comparison function of space and time
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2009/2/24
Currently two polar orbiting satellite instruments measure CO2 concentrations in the Earth's atmosphere, while other missions are planned for the coming years. In the future such instruments might be...
A look at aerosol formation using data mining techniques
aerosol formation data mining techniques
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2009/2/19
Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it remain unclear. In this study data mining ...
Sensor Response Mismatches and Lag Correction Techniques for Temperature-Salinity Profilers
Sensor Response Temperature-Salinity Profilers Lag Correction Techniques
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2009/2/18
Salinity-temperature-depth profilers measure temperature. directly but infer salinity from measurements of temperature, pressure and conductivity. Errors may therefore be introduced into the salinity ...
Intercomparison of four different in-situ techniques for ambient formaldehyde measurements in urban air
four different in-situ techniques ambient formaldehyde measurements urban air
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2009/1/14
Results from an intercomparison of several currently used in-situ techniques for the measurement of atmospheric formaldehyde (CH2O) are presented. The measurements were carried out at Bresso, an urban...
Ambient formaldehyde measurements made at a remote marine boundary layer site during the NAMBLEX campaign – a comparison of data from chromatographic and modified Hantzsch techniques
Ambient formaldehyde measurements remote marine boundary layer NAMBLEX campaign chromatographic and modified Hantzsch techniques
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2009/1/12
Ambient formaldehyde concentrations are reported from the North Atlantic Marine Boundary Layer Experiment (NAMBLEX) campaign at Mace Head on the west coast of Eire during August 2002. The results from...
Edge detection techniques: Evaluations and comparisons
image processing edge detection Euclidean distance
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2010/9/13
Edge detection is one of the most commonly used operations in image analysis, and
there are probably more algorithms in the literature for enhancing and detecting edges
than any other single subject...
Transferability of European Flood Impact Estimation Techniques to the Yangtze River Catchment and Possible Adaptations
flood hazards flood impact estimation flood inundation estimation flood damage damage curves unit flood damage
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2008/12/2
an overview of European flood impact estimation techniques is given. The questions how to handle flood hazards and how to minimise losses due to floods are highlighted. It can be noted, that the estim...
SO2 emissions from Popocatépetl volcano: emission rates and plume imaging using optical remote sensing techniques
SO2 Popocatépetl volcano plume imaging
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2008/11/26
Sulfur dioxide emissions from the Popocatépetl volcano in central Mexico were measured during the MILAGRO field campaign in March 2006. A stationary scanning DOAS (Differential Optical Absorption Spec...