Studies of pulsations on sdBs: structural models and frequency calculations     

Raquel Oreiro  Ana Ulla  Fernando Pérez Hernández  James MacDonald  Ramón García  María Rosa Zapatero 《Astrophysics and Space Science》2004,291(3-4):411-418

We have calculated the structural models of sdB stars and their corresponding theoretical frequencies needed to carry out an asteroseismological analysis.  相似文献   

Probabilities for Solar Siblings     

Mauri Valtonen  A. T. Bajkova  V. V. Bobylev  A. Mylläri 《Celestial Mechanics and Dynamical Astronomy》2015,121(2):107-119

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Climatology of cyclones with southern origin in northern Europe during 1948–2010     

Kaupo Mändla  Jaak Jaagus  Mait Sepp 《Theoretical and Applied Climatology》2015,120(1-2):75-86

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Applying a capitals framework to measuring coping and adaptive capacity in integrated assessment models     

R. Tinch  J. Jäger  I. Omann  P. A. Harrison  Julia Wesely  Rob Dunford 《Climatic change》2015,128(3-4):323-337

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Assessing policy robustness of climate change adaptation measures across sectors and scenarios   总被引：1，自引：1，他引：0  

J. Jäger  M. D. A. Rounsevell  P. A. Harrison  I. Omann  R. Dunford  M. Kammerlander  G. Pataki 《Climatic change》2015,128(3-4):395-407

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The climate sensitive zone along an altitudinal gradient in central Himalayan rivers: a useful concept to monitor climate change impacts in mountain regions     

Ram Devi Tachamo Shah  Subodh Sharma  Peter Haase  Sonja C. Jähnig  Steffen U. Pauls 《Climatic change》2015,132(2):265-278

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Olivine‐rich exposures at Bellicia and Arruntia craters on (4) Vesta from Dawn FC     

Guneshwar Thangjam  Andreas Nathues  Kurt Mengel  Martin Hoffmann  Michael Schäfer  Vishnu Reddy  Edward A. Cloutis  Ulrich Christensen  Holger Sierks  Lucille Le Corre  Jean‐Baptiste Vincent  Christopher T. Russell 《Meteoritics & planetary science》2014,49(10):1831-1850

We present an analysis of olivine‐rich exposures at Bellicia and Arruntia craters using Dawn Framing Camera (FC) color data. Our results confirm the existence of olivine‐rich materials at these localities as described by Ammannito et al. ( 2013a ) using Visual Infrared Spectrometer (VIR) data. Analyzing laboratory spectra of various howardite–eucrite–diogenite meteorites, high‐Ca pyroxenes, olivines, and olivine‐orthopyroxene mixtures, we derive three FC spectral band parameters that are indicators of olivine‐rich materials. Combining the three band parameters allows us, for the first time, to reliably identify sites showing modal olivine contents >40%. The olivine‐rich exposures at Bellicia and Arruntia are mapped using higher spatial resolution FC data. The exposures are located on the slopes of outer/inner crater walls, on the floor of Arruntia, in the ejecta, as well as in nearby fresh small impact craters. The spatial extent of the exposures ranges from a few hundred meters to few kilometers. The olivine‐rich exposures are in accordance with both the magma ocean and the serial magmatism model (e.g., Righter and Drake 1997 ; Yamaguchi et al. 1997 ). However, it remains unsolved why the olivine‐rich materials are mainly concentrated in the northern hemisphere (approximately 36–42°N, 46–74°E) and are almost absent in the Rheasilvia basin.  相似文献   

Negotiating uncertainty: Framing attitudes,prioritizing issues,and finding consensus in the coral reef environment management “crisis”     

Bärbel G. Bischof 《Ocean & Coastal Management》2010,53(10):597-614

Environmental problems are becoming increasingly unwieldy, particularly those which are highly debated because of their political and financial consequences and have been termed as in “crisis”. In coral reef environments, these considerations spill into decisions on mitigation of reef decline and attendant questions of territorial and resource-access rights. Historical foundations of reef science show that early applications of reef inquiries centered on environmental connection and inevitably led to establishing not only the baseline of reef ecosystems, but also contributed to the evolution of conservation crisis in this environment. This work applies Q-methodology towards determining attitudes, prioritizing statements and finding consensus regarding management issues that are tied to the science of coral reef environments and their conservation “crisis”. This work delineates the social construction of attitudes, perceptions, and foundations of coral conservation science by examining the scientifically-grounded statements that constitute conservation debates. Study participants were comprised of the coral reef science and conservation professional network. The Q-sample (n = 43) was structured around some central debates over the dilemmas and strategies of reef management and decline-mitigation, both recent and long-running. Four attitudes or viewpoints were isolated in terms of their preferred management models, geographic perspectives and the role scientific findings play within these core beliefs. These can be generally described as Community and Locally-centered Humanists, Scientific Idealists, Skeptical and Utilitarian Pragmatists, and Politically-oriented Positivists. Evaluating agreement about central issues showed a high degree of consensus regarding the relative importance of community input in the role of successful reef management while the highest degree of contention was seen in scalar issues such as human-environment feedback systems that are inherent in solving environmental crises.  相似文献   

Water resources in mountain regions: a methodological approach to assess the water balance in a highland‐lowland‐system     

Rolf Weingartner  Daniel Viviroli  Bruno Schädler 《水文研究》2007,21(5):578-585

Mountains and highlands are typically areas that provide considerable quantities of water, the latter being an important resource for the lowlands. These run‐off quantities remain discernible in the superior‐scale river systems and significantly contribute to the global water resources. Therefore, mountain regions ought to be given specific consideration with regard to management endeavours. Although well known in principle, details of water resources originating from mountains remain under discussion. A new approach has been introduced, which depicts the water balance of Switzerland in a spatially distributed manner, based on catchments of about 150 km². The main feature of this approach is the areal precipitation, which is calculated using run‐off, evaporation and storage change of glaciers, instead of being derived from gauged precipitation values. This methodology was selected because measurement and regionalization of precipitation remain subject to large uncertainties in mountainous areas. Subsequently, the view is widened to the European Alps, which, as compared with the surrounding lowlands, contribute considerably higher annual discharge, especially in the summer months. Finally, the focus is put on the hydrological significance of mountains in general. In dry regions, mountains, in particular, are indispensable contributors to the water resources downstream. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

The Magnificent Seven in the dusty prairie     

B. Posselt  S. B. Popov  F. Haberl  J. Trümper  R. Turolla  R. Neuhäuser 《Astrophysics and Space Science》2007,308(1-4):171-179

The Magnificent Seven have all been discovered by their exceptional soft X-ray spectra and high ratios of X-ray to optical flux. They all are considered to be nearby sources. Searching for similar objects with larger distances, one expects larger interstellar absorption resulting in harder X-ray counterparts. Current interstellar absorption treatment depends on chosen abundances and scattering cross-sections of the elements as well as on the 3D distribution of the interstellar medium. After a discussion of these factors we use the comprehensive 3D measurements of the Local Bubble by Lallement et al. (2003, Astron. Astrophys. 411, 447) to construct two simple models of the 3D distribution of the hydrogen column density. We test these models by using a set of soft X-ray sources with known distances. Finally, we discuss possible applications for distance estimations and population synthesis studies.   相似文献