The detached eclipsing binary system GX Geminorum     

F. Snchez‐Bajo  A. Garrigs‐Snchez  J.M. Gmez‐Forrellad  J. Nomen‐Torres  W. Kleikamp  P. Frank  W. Moschner  W. Quester  E. García‐Melendo 《Astronomische Nachrichten》2003,324(6):511-515

Results of the photometric analysis by means of the Wilson‐Devinney method, combined with an empirical massradius relation for LC IV stars support the hypothesis that GX Gem is a well detached evolved system of subgiant stars. The solution is consistent with the known spectroscopic parameters obtained by Popper (1996) and the photometric data of Lacy (2002a). (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   

Fold-Axis Parallel Extension along the Southern Ending of the Quito (Ecuadorian Andes) Fault System: Implications in River Network and Aquifer Geometry     

Peñafiel  L. A.  Reyes  P. S. B.  Alcalá  F. J.  Ramírez  M. R.  Cabero  A. 《Geotectonics》2020,54(2):256-265

Geotectonics - Extension parallel to fold axis represents a rarely documented tectonic process that occur in different tectonic settings such as large-scale orogenic belts, mountain ranges, and...  相似文献   

Fatty acids dynamics during embryonic development in genus Uca (Brachyura: Ocypodidae), from the mangroves of Inhaca Island,Mozambique     

Paulo Torres  Gil Penha-Lopes  Luís Narciso  Adriano Macia  José Paula 《Estuarine, Coastal and Shelf Science》2008

Variations in egg volume and fatty acid (FA) content through embryogenesis were evaluated in Uca species from Inhaca island, Mozambique. Egg volume increased 96.1%, 93.3%, 84.2%, 92.9%, 96.3%, respectively, in Uca annulipes, Uca inversa, Uca urvillei, Uca chlorophthalmus and Uca vocans (p < 0.05). Fatty acid content decreased through embryogenesis, showing its importance as fuel during embryonic development. Major fatty acids were 16:0, 18:0, 16:1n-7, 18:1n-9, 18:1n-7, 18:2n-6, 20:5n-3 and 20:4n-3. Unsaturated fatty acids (UFA) and saturated fatty acids (SFA) were used up at a similar rate for U. annulipes and U. inversa contrarily to the other three species. Within the UFA, MUFA were more consumed than PUFA for all species except U. chlorophthalmus. The high values detected for fatty acid trophic markers (essential C₁₈ and C₂₀ PUFAs) and odd-numbered fatty acid suggest that Uca species occupy medium trophic level, primarily omnivores and scavengers/detritivores consuming algae common in the intertidal habitats. The fatty acid consumption pattern during embryonic development was essentially similar between species with some variation as expected, as FA content varies within species mainly due to female feeding ecology, nutritional and physiological conditions, differential demands on resource allocation and geographic and seasonal variations in embryonic development.  相似文献   

三个印度洋区域天然气水合物的产状和地下水文学对比研究     

Miriam Kastner  Marta Torres  杨金玉  马明永 《海洋地质前沿》2008,24(11):35-36

2006年度印度洋天然气水合物规划（NG—HP）的目标是调查控制印度近海天然气水合物分布及其特征的地质因素,以便最终评价作为潜在能源的天然气水合物的开采可能性。海洋中聚集的天然气水合物的总量是巨大的,大约25000～10000亿t。  相似文献   

Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001          下载免费PDF全文

Carles E. Moyano‐Cambero  Josep M. Trigo‐Rodríguez  M. Isabel Benito  Jacinto Alonso‐Azcárate  Martin R. Lee  Narcís Mestres  Marina Martínez‐Jiménez  Francisco J. Martín‐Torres  Jordi Fraxedas 《Meteoritics & planetary science》2017,52(6):1030-1047

Martian meteorites can provide valuable information about past environmental conditions on Mars. Allan Hills 84001 formed more than 4 Gyr ago, and owing to its age and long exposure to the Martian environment, and this meteorite has features that may record early processes. These features include a highly fractured texture, gases trapped during one or more impact events or during formation of the rock, and spherical Fe‐Mg‐Ca carbonates. In this study, we have concentrated on providing new insights into the context of these carbonates using a range of techniques to explore whether they record multiple precipitation and shock events. The petrographic features and compositional properties of these carbonates indicate that at least two pulses of Mg‐ and Fe‐rich solutions saturated the rock. Those two generations of carbonates can be distinguished by a very sharp change in compositions, from being rich in Mg and poor in Fe and Mn, to being poor in Mg and rich in Fe and Mn. Between these two generations of carbonate is evidence for fracturing and local corrosion.  相似文献   

Ichthyoplankton spatial pattern in the inner shelf off Bahía Blanca Estuary, SW Atlantic Ocean     

Mnica Susana Hoffmeyer  Menndez María Clara  Biancalana Florencia  Nizovoy Alicia Mabel  Torres Eduardo Ramn 《Estuarine, Coastal and Shelf Science》2009,84(3):181-392

This study focuses on the composition, abundance and distribution of ichthyoplankton in the inner shelf area off Bahía Blanca Estuary on the SW Atlantic Ocean during late spring. Eggs and larvae of Brevoortia aurea, Engraulis anchoita, Parona signata, Sciaenidae spp. – such as Cynoscion guatucupa and Micropogonias furnieri –, and Odontesthes argentinensis were found. Species richness was low probably as a result of season and shallow depths. Ichthyoplankton abundance reached values close to 10 000 per 10 m⁻³ (eggs) and 4000 per 10 m⁻³ (larvae) and displayed a spatial distribution pattern with maximum abundance values restricted to a band parallel to the coast. Differences between egg and larval patterns, probably derived from a different displacement and hydrodynamic behavior, were observed. Egg and larvae distribution patterns were found related with spawning areas and to directly depend on salinity and mesozooplankton. The larvae distribution pattern, in particular, was found to inversely depend on particulate organic carbon. In addition, the geographic location of egg and larvae maxima strongly coincided with a saline front reported for this area in springtime, thus suggesting a direct relationship with it.  相似文献   

用孔隙水中氯离子浓度异常估算天然气水合物含量     

Marta E Torres  公衍芬 《海洋地质前沿》2007,23(12):34-38

水分子与烃类气体沉积物孔隙中结合形成水合物的过程中,只吸取孔隙中的淡水,而盐类物质不能进入水合物的晶体结构,在水合物形成过程中会引起局部孔隙水离子浓度的浓缩,增加周围沉积物孔隙水的盐度;而当水合物分解时,孔隙水就会被稀释,使得钻孔获得的水合物样品比不含水合物的样品具有更低的盐度.因为C1-是浅层海洋没积物孔隙水中一种丰富且保守的离子,C1-离子浓度变化通常被用来监测天然气水合物的形成和分解.……  相似文献   

On the time variability of γ‐ray sources: a numerical analysis of variability indices     

D.F. Torres  M.E. Pessah  G.E. Romero 《Astronomische Nachrichten》2001,322(4):223-227

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Correction to: Synoptic conditions and potential causes of the extreme heavy rainfall event of January 2009 over Mindanao Island,Philippines     

Olaguera  Lyndon Mark Payanay  Caballar  Michelle Español  De Mata  Joseph Cabacungan  Dagami  Loida Ann Torres  Matsumoto  Jun  Kubota  Hisayuki 《Natural Hazards》2022,110(3):2405-2406

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AsteroFLAG: First results from hare‐and‐hounds Exercise #1     

W.J. Chaplin  T. Appourchaux  T. Arentoft  J. Ballot  J. Christensen‐Dalsgaard  O.L. Creevey  Y. Elsworth  S.T. Fletcher  R.A. García  G. Houdek  S.J. Jimnez‐Reyes  H. Kjeldsen  R. New  C. Rgulo  D. Salabert  T. Sekii  S.G. Sousa  T. Toutain  the rest of the asteroFLAG group 《Astronomische Nachrichten》2008,329(5):549-557

We report on initial results from the first phase of Exercise #1 of the asteroFLAG hare and hounds. The asteroFLAG group is helping to prepare for the asteroseismology component of NASA's Kepler mission, and the first phase of Exercise #1 is concerned with testing extraction of estimates of the large and small frequency spacings of the low‐degree p modes from Kepler‐like artificial data. These seismic frequency spacings will provide key input for complementing the exoplanet search data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献