نتایج جستجو برای: spatial and temporal variation

تعداد نتایج: 16930333  

A. Ahmadian A. Boroomand M.A. Oghabian

Introduction: The accuracy of analyzing Functional MRI (fMRI) data is usually decreases in the presence of noise and artifact sources. A common solution in for analyzing fMRI data having high noise is to use suitable preprocessing methods with the aim of data denoising. Some effects of preprocessing methods on the parametric methods such as general linear model (GLM) have previously been evalua...

2000
Suzanne N. Levine William M. Lewis

Spatial and temporal variability of nitrogen fixation in Lake Valencia, Venezuela, were quantified on the basis of duplicate water samples collected from a depth of 0.5 m at 16 sites on 10 dates. The concentration of heterocysts in samples was determined and the samples were incubated with acetylene in situ. Two-way ANOVA was used to separate the variance associated with site (fixed spatial pat...

Journal: :Epidemiology and infection 2010
E Gabriel D J Wilson A J H Leatherbarrow J Cheesbrough S Gee E Bolton A Fox P Fearnhead C A Hart P J Diggle

A total of 969 isolates of Campylobacter jejuni originating in the Preston, Lancashire postcode district over a 3-year period were characterized using multi-locus sequence typing. Recently developed statistical methods and a genetic model were used to investigate temporal, spatial, spatio-temporal and genetic variation in human C. jejuni infections. The analysis of the data showed statistically...

علیرضا بهرامپور, , محمدحسین زندی, ,

  Several theoretical models for description of the injection locking lasers are presented by previous investigators. Nearly in all of these theories, the temporal and spatial variations of gain of the active medium is neglected. In these theories there levant difference equation of the boundary condition of the input mirror is approximated by an ordinary differential equation and solved. In th...

Journal: :journal of agricultural science and technology 2014
m. r. nematollahi y. fathipour a. a. talebi j. karimzadeh m. zalucki

to estimate population density of the cabbage aphid, brevicoryne brassicae (l.), a stratified random sampling was conducted in two unsprayed canola fields in isfahan (central iran) during 2011-2012. population density was determined for apterous, and alates, as well as the total population, at two plant growth phases (pgp1: from plant emergence to the end of rosette, and pgp2: from the beginnin...

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