نتایج جستجو برای: Spatial cross-correlation

تعداد نتایج: 1174253  

2000
Fabio Canova Gianni de Nicol

This paper examines sources of cyclical movements in output, in ation and the term structure of interest rates. It employs a novel identi cation approach which uses the sign of the cross correlation function in response to shocks to catalog orthogonal disturbances. We nd that demand shocks are the dominant source output, in ation and term structure uctuations in six of the G-7 countries. Within...

The quality properties of andesite (Unit Volume Weight, Uniaxial Compression Strength, Los500, etc.) are required to determine the exploitable blocks and their sequence of extraction. However, the number of samples that can be taken and analyzed is restricted, and thus the quality properties should be estimated at unknown locations. Cokriging has been traditionally used in the estimation of spa...

2015
Yanguang Chen Boris Podobnik

Spatial correlation modeling comprises both spatial autocorrelation and spatial cross-correlation processes. The spatial autocorrelation theory has been well-developed. It is necessary to advance the method of spatial cross-correlation analysis to supplement the autocorrelation analysis. This paper presents a set of models and analytical procedures for spatial cross-correlation analysis. By ana...

2008
H. Vömel

Balloon-borne water vapour measurements during January and February 2004, which were obtained as part of the LAUTLOS campaign at Sodankylä, Finland, 67 N, were used to analyse the water vapour distribution in the wintertime Arctic lowermost stratosphere. A 2.5 km thick layer (or 30 K in the potential temperature scale) above the tropopause is characterized by a significant water vapour variabil...

2008
Ho Seong Hwang Stephen Serjeant Myung Gyoon Lee Kang Hwan Lee Glenn White

We present a result of cross-correlating the Infrared Astronomical Satellite Faint Source Catalogue (IRAS FSC) with the spectroscopic catalogues of galaxies in the Fourth Data Release of Sloan Digital Sky Survey (SDSS), the Final Data Release of 2dF Galaxy Redshift Survey (2dFGRS) and the Second Data Release of 6dF Galaxy Survey (6dFGS). We have identified 324 ultraluminous infrared galaxies (U...

2000
Jounghun Lee Ue-Li Pen

We present a theoretical study of galaxy spin correlation statistics, with detailed technical derivations. We also find an expression for the spin-density cross-correlation, and apply that to Tully catalog. The observational results appear qualitatively consistent with the theoretical predictions, yet the error bars are still large. However, we expect that currently ongoing large surveys such a...

2000
E. M. Douglas R. M. Vogel C. N. Kroll

Trends in ̄ood and low ̄ows in the US were evaluated using a regional average Kendall's S trend test at two spatial scales and over two timeframes. Field signi®cance was assessed using a bootstrap methodology to account for the observed regional cross-correlation of stream ̄ows. Using a 5% signi®cance level, we found no evidence of trends in ̄ood ̄ows but did ®nd evidence of upward trends in low...

2011
Ian Paul Holman Monica Rivas-Casado John P. Bloomfield Jason J. Gurdak

The first comprehensive use of wavelet methods to identify non-stationary time-frequency relations between North Atlantic ocean-atmosphere teleconnection patterns and groundwater levels is described. Long-term hydrogeological time series from three boreholes within different aquifers across the UK are analysed to identify statistically significant wavelet coherence between the North Atlantic Os...

2001
Juri Poutanen

I review the temporal/spectral data of accreting black hole sources paying most attention to the properties of the temporal variability such as photon energy dependent autoand cross-correlation functions, average shot profiles and hardness ratios, and the Fourier frequency dependent time/phase lags. These statistics characterize spectral changes at short time scales that are otherwise impossibl...

2008
A. Vigouroux

The detection of variations in solar irradiance by satellitebased experiments during the last 17 years stimulated modelling e orts to help to identify their causes and to provide estimates for irradiance data when no satellite observations exist. Because of the lack of quantitative physical models of solar irradiance, the current empirical models have been developed with linear regression analy...

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