منابع مشابه
Distinguishing characteristics in underwater images of Northern and Eurasian watermilfoils
This paper describes a simple scheme for distinguishing between two very similar watermilfoils, Eurasian or Myriophyllum spicatum L. and Northern or Myriophyllum exalbescens. Leaf images were isolated from underwater images of the plants. Characteristic features consisting of the ratio of black to white pixels within the convex hull of an edge-mapped leaf, the eccentricity of the ellipse surrou...
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Hot weather is an important determinant of human mortality. In the United States, a major heat wave can cause literally thousands of excess deaths in a given summer. Yet, for purposes of public health, the term "heat wave" is not easily defined. "Hot" is a relative term, and periods of hot weather (heat waves) vary greatly in intensity and duration. Ambient temperatures may change rapidly, and ...
متن کاملHeat waves and health protection.
http://bmj.com/cgi/content/full/333/7563/314 Updated information and services can be found at: These include: References http://bmj.com/cgi/content/full/333/7563/314#otherarticles 2 online articles that cite this article can be accessed at: http://bmj.com/cgi/content/full/333/7563/314#BIBL This article cites 6 articles, 1 of which can be accessed free at: Rapid responses http://bmj.com/cgi/elet...
متن کاملNorthern Winter Stationary Waves: Theory and Modeling
A review is provided of stationary wave theory, the theory for the deviations from zonal symmetry of the climate. To help focus the discussion the authors concentrate exclusively on northern winter. Several theoretical issues, including the external Rossby wave dispersion relation and vertical structure, critical latitude absorption, the nonlinear response to orography, and the interaction of f...
متن کاملSynoptic Analysis of Early Heat Waves in Northwest of Iran
Early heat waves are extreme events that cause heavy losses in plant and animal life and cause many social and economic problems for communities. The purpose of this study was to identify synoptic patterns and statistical analysis of preterm heat waves in northwestern Iran. To do this, the maximum daily temperature data of March 14th was used for fourteen synoptic stations in the northwest of t...
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ژورنال
عنوان ژورنال: Journal of Climate
سال: 2014
ISSN: 0894-8755,1520-0442
DOI: 10.1175/jcli-d-13-00360.1