Equations for the migration dynamics of a homogeneous population on both the stochastic and the deterministic level are set up. The transition probability is constructed using utility functions depending on population densities and trendparameters
. The trendparameters uniquely determine and are determined by the dynamics. A multiple of final stationary states can be reached and migratory phase transitions can appear for transition probabilities being nonlinear in population densities. Numerical
Climatic trends of different intensity heavy precipitation events concentration in China
China ; Climatic trend ; Climatic variability ; Flood ; Forecast ; Heavy rain ; Monsoon ; Precipitation ; Statistics
their statistical characteristics, mainly including spatial and temporal distributions, variations and climatic trends of the 2 parameters of the durative heavy precipitation events in China.This method can be applied in flood assessment and climate change fields.
This study presents and discusses the most prominent parameters of the present climate at the Mittivakkat Glacier catchment and focuses on the spatiotemporal variations and trends of these parameters for the period 1994-2006, comparing the coastal
area and the upper glacier area. Based on the period of detailed observations and supported by synoptic meteorological data from Tasiilaq, the AA. hindcast the variations and trends in air temperature, relative humidity, wind speed, and precipitation
Recent levels and trends in hydrochemical and pollution parameters in the Gulf of Bothnia
Etude des teneurs moyennes et des évolutions dans le temps des concentrations des principaux paramètres hydrochimiques et des pollutions, dans la baie et la mer de Botnie. Sauf le plomb, les métaux lourds (Zn, Cd, Cu, As, Hg) sont présents à des
The long-term trend toward increased dispersion in the distributions of city sizes
L'A. propose deux modèles complémentaires pour mettre en relation les valeurs observées du paramètre de la loi de Pareto appliquée à une distribution rang-taille des villes, et des caractéristiques de la base économique de ces villes (production
Active layer ; Arctic Region ; Climate ; Climatic data ; Climatic trend ; Greenland ; Meteorology ; Snow cover ; Soil temperature ; Temperature
This paper summarises meteorological parameters during 2002, including snow cover, ground temperatures and active layer development, and air temperatures at the station during 1991-2002 are compare to large scale trends during the last century.
The AA. present the results of a quantitative study of possible trends on the various fan surfaces with respect to grain-size distributions, clast sphericity, roundness and orientation, and examine the dependence of these parameters on size
and lithology of clasts. The purpose of this evaluation was to determine if such information could differentiate and characterize the various fan surfaces and other subenvironments. Of the examined parameters, clast orientation is the best predictor of relative
monitored and to the environment in which the station is functioning. Examples of climate data measured during 1994 are presented, and general trends in the fluctuation of the selected parameters are annotated.
In October 1990 a new automatic meteorological station was established at the Arctic station, Qeqertarsuaq. It is the purpose of this note to draw the attention to the existence of this meteorological station, the character of climate parameter
The application of geostatistics in grain size trend analysis : a case study of eastern Beibu Gulf
China ; Coastal dynamics ; Coastal environment ; Geostatistics ; Grain size distribution ; Pacific Ocean ; Sediment transport ; Sedimentology ; South China Sea ; Trend surface
After applying geostatistical analysis to the mean size, sorting and skewness for the sediment samples collected from the eastern Beibu Gulf, the AA. compared the semivariograms of these 3 parameters by using different interpolation distance
. The results indicated that the range for sorting coefficient was physically meaningful. The trend vectors calculated from grain size trend analysis model were consistent with the annual ocean circulation patterns and sediment transport rates according
to previous studies. Therefore the range derived from the semivariogram of mean size can be used as the characteristic distance in the grain size trend analysis, which may remove the bias caused by the traditional way of basing on experiences or testing
On the relationships between regional and national unemployment trends
indiquent que cela influence les distributions d'échantillons des paramètres de l'équation de régression et l'A. propose que l'interprétation de ces paramètres utilise des distributions d'échantillons empiriques pertinentes. La simulation utilise 5systèmes
Etude de la distribution spatio-temporelle des paramètres climatiques dans le territoire de l'Ethiopie : premiers résultats
Climate ; Climatic data ; Climatic trend ; Desertification ; Ethiopia ; Mountain ; Precipitation ; Spatial distribution ; Statistics ; Temperature
a.s.l. These data were statiscally analysed in order to provide a reliable base for the characterisations of climate in this part of the world and to investigation on the occurence of climatic trends with respect to desertification process that is widely
The A. distinguishes between implied dynamics (change is analysed through an examination of the parameter space of a static model) and absolute dynamics (time is explicitly included in the specification). This review charts the development of both
these approaches and concludes with a discussion of current trends and tendencies.
Chutes de neige et manteau nival sont étroitement corrélés à la température, à la pression atmosphérique et à l'abondance des précipitations, le poids relatif de chacun de ces paramètres étant modulé par l'altitude. Depuis le début des années 1950
Compared to the unemployment trends in advanced west European countries and in post-communist countries, the Czech Republic's indexes appear to be a typical. The decrease in industrial production, the end of the privatisation process
and the pressure of European parameters on economy which had for a long time been organised in an extensive way, were not accompanied by a significant increase in the number of job applicants. The proportion of employment in individual sectors of the national
the successful identification of trends in the forthcoming post-industrial society (the society of opportunities) and about ensuring the Czech Republic's entry to the third civilisation wave. (L'A.).
Hurricane track variability and secular potential intensity trends
Des différents paramètres caractérisant l'activité cyclonique sur l'Atlantique Nord tropical (intensité, fréquence, lieu d'origine, durée, trajectoire des ouragans…), seul le premier est directement lié à la variabilité du climat, via notamment la
Meteorological trends (1991-2004) at Arctic Station, Central West Greenland (69°15'N) in a 130 years perspective
paramètres incluent les observations quotidiennes de manteau nival, de la glace de mer, des températures de l'air et du sol, du régime des vents, de la pression, des précipitations et du rayonnement solaire.
The simulation of space-dependent data in geology in Future trends in geomathematics.
Simulation des concentrations en éléments chimiques majeurs des intrusions ignées des montagnes Lakeview permettant de fixer des valeurs possibles de paramètres géologiques qui sont continus sur l'espace et corrélés différemment les uns aux autres
There is evidence that, between hydrological years 1931/2 and 1990/1, rainfall changed in the Algarve. There was an annual rainfall increase (+9%) and a (7%) increase in rainfall during the rainy period (October to February). Both trends were
statistically confirmed by parametric and nonparamertric procedures. Rainfall erosivity and land degradation are related to rainfall regime. The Algarve's rainfall erosivity increase (+17%) was more pronounced than annual and seasonal rainfall changes.