Star formation in starburst galaxies from near-IR spectroscopy and evolutionary population synthesis     

A. Lançon  B. Rocca-Volmerange 《Astrophysics and Space Science》1994,217(1-2):271-272

We show that the combined study of the near-IR Stellar Energy Distribution (SED) and emission lines in IR luminous starburst galaxies, using evolutionary population synthesis, gives constraints both on the star formation (SF) parameters and on the relative spatial distribution of the components (burst stars, evolved stars, H II regions, dust). We also note that the He I λ 2.06/Br _γ ratio, used to constrain the stellar upper mass limit, is sensitive to a variety of other factors that should be accounted for.  相似文献   

Cosmological Models with Variable G and Λ     

Can Battal Kılınç 《Astrophysics and Space Science》2004,289(1-2):103-109

Einstein's equations with variable gravitational and cosmological constants are considered in the presence of a perfect fluid for the anizotropic Bianchi I universe in a way which conserving the energy-momentum tensor. Two solutions are found, one of which the cosmological term varies inversely with power law of time. The other of which cosmological term is constant.  相似文献   

A rational method for determining the swelling pressure of expansive soils: Paired swell test (PS-test)     

Selçuk  Levent 《Acta Geotechnica》2022,17(8):3161-3180

Acta Geotechnica - Experimental investigations on the expansion behavior of clayey soils are of great importance to correctly understand the response of the soil–foundation. In this context,...  相似文献   

Properties and Comparison of Some Kriging Sub-model Aggregation Methods     

Bachoc  François  Durrande  Nicolas  Rullière  Didier  Chevalier  Clément 《Mathematical Geosciences》2022,54(5):941-977

Mathematical Geosciences - Kriging is a widely employed technique across computer experiments, machine learning and geostatistics. An important challenge for kriging is its high costs when dealing...  相似文献   

Accelerated weathering of hydrophobized sands     

Lin  Hongjie  Lourenço  Sérgio D. N. 《Acta Geotechnica》2022,17(2):377-390

Acta Geotechnica - Hydrophobized sands have been suggested as materials for hydraulic barriers in infrastructure. When placed at the interface ground–atmosphere, environmental factors such as...  相似文献   

A uranium bioremediation reactive transport benchmark     

Steven B. Yabusaki  Sevinç S. Şengör  Yilin Fang 《Computational Geosciences》2015,19(3):551-567

  相似文献   

Can shallow open-loop hydrothermal well-doublets help remediate seawater intrusion?     

François De Keuleneer  Philippe Renard 《Hydrogeology Journal》2015,23(4):619-629

  相似文献   

Multiple advances of Alpine glaciers into the Jura Mountains in the Northwestern Switzerland     

Angela Graf  Naki Akçar  Susan Ivy-Ochs  Stefan Strasky  Peter W. Kubik  Marcus Christl  Martin Burkhard  Rainer Wieler  Christian Schlüchter 《Swiss Journal of Geoscience》2015,108(2-3):225-238

  相似文献   

Influence d'un changement climatique dû à une hausse de gaz à effet de serre sur l'agriculture au quebec     

Bhawan Singh  Mustapha El Maayar  Pierre André  Jean‐Pierre Thouez  Christopher Bryant  Denis Provençal 《大气与海洋》2013,51(2):379-399

Abstract

This study, using a climate change scenario generated by the Canadian Climate Centre (CCC) general circulation model (GCM) examines the impacts of such a climate change on agriculture in southern Quebec. Using a crop model from the Food and Agriculture Organization (FAO), yield responses of a variety of cereals, legumes, oleaginous and special crops to climate change are analysed and discussed.

Results show that under the 2 × CO₂ climate scenario the growing season would be longer and accumulation of corn heat units and growing degree days would be more important than under actual climate (1961–1990). One of the more important results of this study is that, on the one hand yield of C₃ cereals would be lower and that of C₄ cereals higher in most agricultural regions. On the other hand, the direct fertilisation effect of increased CO₂ is not considered. It must be cautioned however that we can not generalise results obtained for one legume crop to all legumes.  相似文献   

Modeling monthly mean air temperature for Brazil   总被引：1，自引：1，他引：0  

Clayton Alcarde Alvares  José Luiz Stape  Paulo Cesar Sentelhas  José Leonardo de Moraes Gonçalves 《Theoretical and Applied Climatology》2013,113(3-4):407-427

Air temperature is one of the main weather variables influencing agriculture around the world. Its availability, however, is a concern, mainly in Brazil where the weather stations are more concentrated on the coastal regions of the country. Therefore, the present study had as an objective to develop models for estimating monthly and annual mean air temperature for the Brazilian territory using multiple regression and geographic information system techniques. Temperature data from 2,400 stations distributed across the Brazilian territory were used, 1,800 to develop the equations and 600 for validating them, as well as their geographical coordinates and altitude as independent variables for the models. A total of 39 models were developed, relating the dependent variables maximum, mean, and minimum air temperatures (monthly and annual) to the independent variables latitude, longitude, altitude, and their combinations. All regression models were statistically significant (α?≤?0.01). The monthly and annual temperature models presented determination coefficients between 0.54 and 0.96. We obtained an overall spatial correlation higher than 0.9 between the models proposed and the 16 major models already published for some Brazilian regions, considering a total of 3.67?×?10⁸?pixels evaluated. Our national temperature models are recommended to predict air temperature in all Brazilian territories.  相似文献