Base de dados : MEDLINE
Pesquisa : G01.060.075.730.600 [Categoria DeCS]
Referências encontradas : 199 [refinar]
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  1 / 199 MEDLINE  
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[PMID]:28332539
[Au] Autor:Reardon S; Tollefson J; Witze A; Ross E
[Ti] Título:US science agencies face deep cuts in Trump budget.
[So] Source:Nature;543(7646):471-472, 2017 03 16.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Orçamentos/legislação & jurisprudência
National Institutes of Health (U.S.)/economia
Ciência/economia
Ciência/legislação & jurisprudência
United States Environmental Protection Agency/economia
United States National Aeronautics and Space Administration/economia
[Mh] Termos MeSH secundário: Animais
Seres Humanos
Júpiter
Planetas Menores
National Institutes of Health (U.S.)/organização & administração
Ciência/tendências
Estados Unidos
[Pt] Tipo de publicação:NEWS
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170804
[Lr] Data última revisão:
170804
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170324
[St] Status:MEDLINE
[do] DOI:10.1038/nature.2017.21652


  2 / 199 MEDLINE  
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[PMID]:27558045
[Au] Autor:Witze A
[Ti] Título:Obama's science legacy: a space race stalls.
[So] Source:Nature;536(7617):386, 2016 08 25.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Governo Federal
Marte
Política
Voo Espacial/legislação & jurisprudência
Voo Espacial/tendências
United States National Aeronautics and Space Administration/legislação & jurisprudência
[Mh] Termos MeSH secundário: Astronautas/economia
Astronautas/tendências
Seres Humanos
Júpiter
Planetas Menores
Robótica/economia
Robótica/tendências
Voo Espacial/economia
Voo Espacial/instrumentação
Estados Unidos
United States National Aeronautics and Space Administration/economia
United States National Aeronautics and Space Administration/tendências
[Pt] Tipo de publicação:NEWS
[Em] Mês de entrada:1609
[Cu] Atualização por classe:161216
[Lr] Data última revisão:
161216
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160826
[St] Status:MEDLINE
[do] DOI:10.1038/536386a


  3 / 199 MEDLINE  
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[PMID]:27196839
[Au] Autor:Brusatte S; Luo ZX
[Ti] Título:Ascent of the Mammals.
[So] Source:Sci Am;314(6):28-35, 2016 Jun.
[Is] ISSN:0036-8733
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Evolução Biológica
Fósseis
Mamíferos
[Mh] Termos MeSH secundário: Animais
China
Dinossauros
Extinção Biológica
Planetas Menores
Erupções Vulcânicas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1608
[Cu] Atualização por classe:160520
[Lr] Data última revisão:
160520
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160520
[St] Status:MEDLINE
[do] DOI:10.1038/scientificamerican0616-28


  4 / 199 MEDLINE  
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[PMID]:26990270
[Au] Autor:Bosiek K; Hausmann M; Hildenbrand G
[Ad] Endereço:1 Department of Physics and Astronomy, Kirchhoff Institute for Physics, University of Heidelberg , Heidelberg, Germany .
[Ti] Título:Perspectives on Comets, Comet-like Asteroids, and Their Predisposition to Provide an Environment That Is Friendly to Life.
[So] Source:Astrobiology;16(4):311-23, 2016 Apr.
[Is] ISSN:1557-8070
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In recent years, studies have shown that there are many similarities between comets and asteroids. In some cases, it cannot even be determined to which of these groups an object belongs. This is especially true for objects found beyond the main asteroid belt. Because of the lack of comet fragments, more progress has been made concerning the chemical composition of asteroids. In particular, the SMASSII classification establishes a link between the reflecting spectra and chemical composition of asteroids and meteorites. To find clues for the chemical structure of comets, the parameters of all known asteroids of the SMASSII classification were compared to those of comet groups like the Encke-type comets, the Jupiter-family comets, and the Halley-type comets, as well as comet-like objects like the damocloids and the centaurs. Fifty-six SMASSII objects similar to comets were found and are categorized as comet-like asteroids in this work. Aside from the chemistry, it is assumed that the available energy on these celestial bodies plays an important role concerning habitability. For the determination of the available energy, the effective temperature was calculated. Additionally, the size of these objects was considered in order to evaluate the possibility of a liquid water core, which provides an environment that is more likely to support processes necessary to create the building blocks of life. Further study of such objects could be notable for the period of the Late Heavy Bombardment and could therefore provide important implications for our understanding of the inner workings of the prebiotic evolution within the Solar System since the beginning.
[Mh] Termos MeSH primário: Meteoroides
Planetas Menores
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160319
[St] Status:MEDLINE
[do] DOI:10.1089/ast.2015.1354


  5 / 199 MEDLINE  
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[PMID]:26941297
[Au] Autor:Hand E
[Ti] Título:PLANETARY SCIENCE. Scientists to drill into dinosaur-killing blast.
[So] Source:Science;351(6277):1015-6, 2016 Mar 04.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Dinossauros
Desastres
Explosões
Extinção Biológica
[Mh] Termos MeSH secundário: Animais
DNA/análise
Golfo do México
Microbiota/genética
Planetas Menores
[Pt] Tipo de publicação:NEWS
[Nm] Nome de substância:
9007-49-2 (DNA)
[Em] Mês de entrada:1603
[Cu] Atualização por classe:160304
[Lr] Data última revisão:
160304
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160305
[St] Status:MEDLINE
[do] DOI:10.1126/science.351.6277.1015


  6 / 199 MEDLINE  
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[PMID]:26215051
[Au] Autor:Reinhardt JC; Chen X; Liu W; Manchev P; Paté-Cornell ME
[Ad] Endereço:Department of Management Science and Engineering, Stanford University, Stanford, CA, 94305, USA.
[Ti] Título:Asteroid Risk Assessment: A Probabilistic Approach.
[So] Source:Risk Anal;36(2):244-61, 2016 Feb.
[Is] ISSN:1539-6924
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Following the 2013 Chelyabinsk event, the risks posed by asteroids attracted renewed interest, from both the scientific and policy-making communities. It reminded the world that impacts from near-Earth objects (NEOs), while rare, have the potential to cause great damage to cities and populations. Point estimates of the risk (such as mean numbers of casualties) have been proposed, but because of the low-probability, high-consequence nature of asteroid impacts, these averages provide limited actionable information. While more work is needed to further refine its input distributions (e.g., NEO diameters), the probabilistic model presented in this article allows a more complete evaluation of the risk of NEO impacts because the results are distributions that cover the range of potential casualties. This model is based on a modularized simulation that uses probabilistic inputs to estimate probabilistic risk metrics, including those of rare asteroid impacts. Illustrative results of this analysis are presented for a period of 100 years. As part of this demonstration, we assess the effectiveness of civil defense measures in mitigating the risk of human casualties. We find that they are likely to be beneficial but not a panacea. We also compute the probability-but not the consequences-of an impact with global effects ("cataclysm"). We conclude that there is a continued need for NEO observation, and for analyses of the feasibility and risk-reduction effectiveness of space missions designed to deflect or destroy asteroids that threaten the Earth.
[Mh] Termos MeSH primário: Planetas Menores
Probabilidade
Medição de Risco/métodos
[Mh] Termos MeSH secundário: Clima
Mudança Climática
Simulação por Computador
Desastres
Terra (Planeta)
Geografia
Seres Humanos
Meteoroides
Distribuição de Poisson
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150729
[St] Status:MEDLINE
[do] DOI:10.1111/risa.12453


  7 / 199 MEDLINE  
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[PMID]:26455002
[Au] Autor:Siuda-Bochenek M
[Ti] Título:[JAN JEDRZEJEWICZ AND EUROPEAN ASTRONOMY OF THE 2ND HALF OF THE 19TH CENTURY].
[Ti] Título:JAN JEDRZEJEWICZ I ASTRONOMIA EUROPEJSKA. 2. POLOWY XIX STULECIA..
[So] Source:Kwart Hist Nauki Tech;60(2):93-115, 2015.
[Is] ISSN:0023-589X
[Cp] País de publicação:Poland
[La] Idioma:pol
[Ab] Resumo:Jan Jedrzejewicz was an amateur astronomer who in the 2nd half of the 19th century created an observation centre, which considering the level of research was comparable to the European ones. Jedrzejewicz settled down in Plonsk in 1862 and worked as a doctor ever since but his greatest passion was astronomy, to which he dedicated all his free time. In 1875 Jedrzejewicz finished the construction of his observatory. He equipped it with basic astronomical and meteorological instruments, then began his observations and with time he became quite skilled in it. Jedrzejewicz focused mainly on binary stars but he also pointed his telescopes at the planets of the solar system, the comets, the Sun, as well as all the phenomena appearing in the sky at that time. Thanks to the variety of the objects observed and the number of observations he stood out from other observers in Poland and took a very good position in the mainstream of the 19th-century astronomy in Europe. Micrometer observations of binary stars made in Plonsk gained recognition in the West and were included in the catalogues of binary stars. Interest in Jedrzejewicz and his observatory was confirmed by numerous references in the English "Nature" magazine.
[Mh] Termos MeSH primário: Astronomia/história
[Mh] Termos MeSH secundário: Europa (Continente)
Meio Ambiente Extraterreno
História do Século XIX
Seres Humanos
Literatura Moderna/história
Planetas Menores
Planetas
Polônia
Sistema Solar
[Pt] Tipo de publicação:BIOGRAPHY; ENGLISH ABSTRACT; HISTORICAL ARTICLE; JOURNAL ARTICLE
[Ps] Nome de pessoa como assunto:Jedrzejewicz J
[Em] Mês de entrada:1511
[Cu] Atualização por classe:151012
[Lr] Data última revisão:
151012
[Sb] Subgrupo de revista:QIS
[Da] Data de entrada para processamento:151013
[St] Status:MEDLINE


  8 / 199 MEDLINE  
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[PMID]:26367382
[Au] Autor:Zhang P; Liu K; Zhao B; Li Y
[Ad] Endereço:Department of Control Science and Engineering, Jilin University, Changchun, Jilin, China.
[Ti] Título:A Computationally Inexpensive Optimal Guidance via Radial-Basis-Function Neural Network for Autonomous Soft Landing on Asteroids.
[So] Source:PLoS One;10(9):e0137792, 2015.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Optimal guidance is essential for the soft landing task. However, due to its high computational complexities, it is hardly applied to the autonomous guidance. In this paper, a computationally inexpensive optimal guidance algorithm based on the radial basis function neural network (RBFNN) is proposed. The optimization problem of the trajectory for soft landing on asteroids is formulated and transformed into a two-point boundary value problem (TPBVP). Combining the database of initial states with the relative initial co-states, an RBFNN is trained offline. The optimal trajectory of the soft landing is determined rapidly by applying the trained network in the online guidance. The Monte Carlo simulations of soft landing on the Eros433 are performed to demonstrate the effectiveness of the proposed guidance algorithm.
[Mh] Termos MeSH primário: Simulação por Computador
Planetas Menores
Modelos Teóricos
Redes Neurais (Computação)
Voo Espacial
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1605
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150915
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0137792


  9 / 199 MEDLINE  
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[PMID]:25964350
[Au] Autor:Tyrrell T; Merico A; Armstrong McKay DI
[Ad] Endereço:Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton SO14 3ZH, United Kingdom; tt@noc.soton.ac.uk.
[Ti] Título:Severity of ocean acidification following the end-Cretaceous asteroid impact.
[So] Source:Proc Natl Acad Sci U S A;112(21):6556-61, 2015 May 26.
[Is] ISSN:1091-6490
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Most paleo-episodes of ocean acidification (OA) were either too slow or too small to be instructive in predicting near-future impacts. The end-Cretaceous event (66 Mya) is intriguing in this regard, both because of its rapid onset and also because many pelagic calcifying species (including 100% of ammonites and more than 90% of calcareous nannoplankton and foraminifera) went extinct at this time. Here we evaluate whether extinction-level OA could feasibly have been produced by the asteroid impact. Carbon cycle box models were used to estimate OA consequences of (i) vaporization of up to 60 × 10(15) mol of sulfur from gypsum rocks at the point of impact; (ii) generation of up to 5 × 10(15) mol of NOx by the impact pressure wave and other sources; (iii) release of up to 6,500 Pg C as CO2 from vaporization of carbonate rocks, wildfires, and soil carbon decay; and (iv) ocean overturn bringing high-CO2 water to the surface. We find that the acidification produced by most processes is too weak to explain calcifier extinctions. Sulfuric acid additions could have made the surface ocean extremely undersaturated (Ωcalcite <0.5), but only if they reached the ocean very rapidly (over a few days) and if the quantity added was at the top end of literature estimates. We therefore conclude that severe ocean acidification might have been, but most likely was not, responsible for the great extinctions of planktonic calcifiers and ammonites at the end of the Cretaceous.
[Mh] Termos MeSH primário: Planetas Menores
Oceanos e Mares
Água do Mar/química
[Mh] Termos MeSH secundário: Aerossóis
Animais
Atmosfera
Carbonato de Cálcio/metabolismo
Ciclo do Carbono
Dióxido de Carbono
Extinção Biológica
Concentração de Íons de Hidrogênio
Modelos Biológicos
Modelos Químicos
Óxidos de Nitrogênio
Paleontologia
Ácidos Sulfúricos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Aerosols); 0 (Nitrogen Oxides); 0 (Sulfuric Acids); 142M471B3J (Carbon Dioxide); H0G9379FGK (Calcium Carbonate); O40UQP6WCF (sulfuric acid)
[Em] Mês de entrada:1508
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150513
[St] Status:MEDLINE
[do] DOI:10.1073/pnas.1418604112


  10 / 199 MEDLINE  
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[PMID]:25810185
[Au] Autor:Witze A
[Ti] Título:Bright spots hint at active ice on Ceres.
[So] Source:Nature;519(7544):401, 2015 Mar 26.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Meio Ambiente Extraterreno/química
Gelo/análise
Planetas
[Mh] Termos MeSH secundário: Planetas Menores
Voo Espacial
[Pt] Tipo de publicação:NEWS
[Nm] Nome de substância:
0 (Ice)
[Em] Mês de entrada:1506
[Cu] Atualização por classe:150326
[Lr] Data última revisão:
150326
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150327
[St] Status:MEDLINE
[do] DOI:10.1038/nature.2015.17139



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