排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
López-Valverde Miguel A. Gerard Jean-Claude González-Galindo Francisco Vandaele Ann-Carine Thomas Ian Korablev Oleg Ignatiev Nikolai Fedorova Anna Montmessin Franck Määttänen Anni Guilbon Sabrina Lefevre Franck Patel Manish R. Jiménez-Monferrer Sergio García-Comas Maya Cardesin Alejandro Wilson Colin F. Clancy R. T. Kleinböhl Armin McCleese Daniel J. Kass David M. Schneider Nick M. Chaffin Michael S. López-Moreno José Juan Rodríguez Julio 《Space Science Reviews》2018,214(1):1-31
Space Science Reviews - Time measured by an ideal clock crucially depends on the gravitational potential and velocity of the clock according to general relativity. Technological advances in... 相似文献
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Jean-Claude Guillemin Yann TrolezAurélien Moncomble 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
Cyanobutadiyne has been synthesized starting from the mono or bistributylstannyl derivative of 1,3-butadiyne and p-toluenesulfonyl cyanide. The UV spectrum of HC5N and the 13C NMR spectrum of the deuterocyanobutadiyne DC5N have been recorded for the first time. Cyanobutadiyne has been detected in the photolysis of mixtures of gases observed on Titan. Its formation starting from cyanoacetylene and acetylene also occurs in the presence of huge amounts of dinitrogen, the major constituent of the Titan’s atmosphere. The application of these findings to the atmosphere of Titan is discussed. The chemistry and photochemistry of cyanobutadiyne have been investigated. A photoadduct has been observed in the photolysis of cyanoacetylene and ethanethiol and, a univocal synthesis of this compound was performed by a nucleophilic addition reaction. 相似文献
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Space Science Reviews - Measurements of the intensities of the O?vi 1032and 1037&;nbsp;Å spectral lines in the southern solar hemisphere, from 1.5 to 5&;nbsp;R s, were made with... 相似文献
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Pierre Delage Foivos Karakostas Amine Dhemaied Malik Belmokhtar Philippe Lognonné Matt Golombek Emmanuel De Laure Ken Hurst Jean-Claude Dupla Sharon Kedar Yu Jun Cui Bruce Banerdt 《Space Science Reviews》2017,211(1-4):191-213
In support of the InSight mission in which two instruments (the SEIS seismometer and the \(\mbox{HP}^{3}\) heat flow probe) will interact directly with the regolith on the surface of Mars, a series of mechanical tests were conducted on three different regolith simulants to better understand the observations of the physical and mechanical parameters that will be derived from InSight. The mechanical data obtained were also compared to data on terrestrial sands. The density of the regolith strongly influences its mechanical properties, as determined from the data on terrestrial sands. The elastoplastic compression volume changes were investigated through oedometer tests that also provided estimates of possible changes in density with depth. The results of direct shear tests provided values of friction angles that were compared with that of a terrestrial sand, and an extrapolation to lower density provided a friction angle compatible with that estimated from previous observations on the surface of Mars. The importance of the contracting/dilating shear volume changes of sands on the dynamic penetration of the mole was determined, with penetration facilitated by the \(\sim1.3~\mbox{Mg/m}^{3}\) density estimated at the landing site. Seismic velocities, measured by means of piezoelectric bender elements in triaxial specimens submitted to various isotropic confining stresses, show the importance of the confining stress, with lesser influence of density changes under compression. A power law relation of velocity as a function of confining stress with an exponent of 0.3 was identified from the tests, allowing an estimate of the surface seismic velocity of 150 m/s. The effect on the seismic velocity of a 10% proportion of rock in the regolith was also studied. These data will be compared with in situ data measured by InSight after landing. 相似文献
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Kleczek J. van Gent R. H. Rutten Robert J. de Munck J. C. Slottje C. Severne G. Pecker Jean-Claude Postma H. Grishchuk L. P. Niewenhuijzen H. Schuiling R. D. van Beek H. F. Reijnen G. C. M. Heidmann Jean Lemaire J. Bleeker Johan Icke V. Neéman Y. Feast M. W. de Graaff W. 《Space Science Reviews》1986,43(3-4):383-396
Space Science Reviews - 相似文献
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Jean-Claude Hénoux 《Space Science Reviews》1998,85(1-2):215-226
In this review, the main models of ion-neutral frationation leading to an enhancement of the low FIP to high FIP abundance
ratio in the corona or in the solar wind, are presented. Models based on diffusion parallel to the magnetic field are discussed;
they are highly dependent on the boundary conditions. The magnetic field, that naturally separates ions from neutrals moving
perpendicular to the field lines direction, when the ion-neutral frequency becomes lower than the ion gyrofrequency, is expected
to play an active role in the ion-neutral separation. It is then suggested that ion-neutral fractionation is linked to the
formation of the solar chromosphere, i.e. in magnetic flux-tubes at a temperature between 4000 and 6000 K.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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为降低成本和提高二维增强酚醛材料的力学性能,开发了一种新的工艺方法.该方法采用三维高强碳增强体和RTM酚醛树脂,具有减少加工步骤的特点,并使安全和环保方面的条件得以改善. 相似文献
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Miroslav Plavec R. Hoekstra C. De Jager Ji⋖´ Grygar J. Otterman H. M. van den Dool O. Namba C. J. Th. Gunsing Jean-Claude Pecker K. K. Kwee L. Perek D. Callebaut Jan Kuijpers W. de Graaff G. C. M. Reijnen B. Swanenburg N. Grevesse J. Kleczek P. P≙quet A. D. Fokker H. G. van Bueren D. Edgar Page R. J. van Duinen Franco Pacini 《Space Science Reviews》1978,21(4):469-483
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Jean-Claude Pecker 《Space Science Reviews》1963,1(4):729-748
Sommaire Les travaux expérimentaux stellaires dans le proche UV sont rappelés brièvement: ils ont conduit à la détection de nébulosités entourant les étoiles chaudes (vers 1300 Å) et à l'observation, pour ces mêmes étoiles chaudes, d'un affaiblissement important de la brillance pour < 2400 Å. Les différentes interprétations et discussions sont passées en revue. Une discussion plus complète est donnée dans le cas de l'hypothèe d'un nuage de particules circumstellaires, qui semble susceptible de fournir une interprétation aux deux types d'observation mentionnées.
Summary The stellar observational data obtained in the near UV are briefly described. They led to the detection of nebulosities around early type stars (circa 1300 Å) and to the observation, in the spectrum of these stars, of a strong reduction of the brightness at wave lengths shorter than 2400 Å. The several interpretations and discussions are reviewed. A somewhat more complete discussion is presented for the case of the circumstellar dust cloud hypothesis, which seems able to make understandable both types of observational data.相似文献