木卫六是木星最大的一颗不规则天然卫星,为了获得它的高精度观测位置,天体测量归算过程中各方面都需要考虑,其中特别重要的是参考星表的选择。应用最新公布的星表Gaia Data Release 1(Gaia DR1),同时采用UCAC4星表进行比较,对2015年云...木卫六是木星最大的一颗不规则天然卫星,为了获得它的高精度观测位置,天体测量归算过程中各方面都需要考虑,其中特别重要的是参考星表的选择。应用最新公布的星表Gaia Data Release 1(Gaia DR1),同时采用UCAC4星表进行比较,对2015年云南天文台获得的185个木卫六的观测资料进行处理和归算,结果显示,采用Gaia DR1星表的木卫六的位置测量精度在赤经和赤纬两个方向都约为0.02″,比采用UCAC4的结果有显著提升。展开更多
Machine learning has increasingly gained more popularity with its incredibly powerful ability to make predictions or calculate suggestions for large amounts of data. We apply machine learning clas-sification to 85 613...Machine learning has increasingly gained more popularity with its incredibly powerful ability to make predictions or calculate suggestions for large amounts of data. We apply machine learning clas-sification to 85 613 922 objects in the Gala Data Release 2, based on a combination of Pan-STARRS I and AI1WISE data. The classification results are cross-matched with the Simbad database, and the to-tal accuracy is 91.9%. Our sample is dominated by stars, ~98%, and galaxies make up 2%. For the objects with negative parallaxes, about 2.5% are galaxies and QSOs, while about 99.9% are stars if the relative parallax uncertainties are smaller than 0.2. Our result implies that using the threshold of 0 〈 σπ/π 〈 0.2 could yield a very clean stellar sample.展开更多
On March 31,a Chinese high-end women’s clothing brand Heaven Gaia was showcased in the Golden Hall of the Beijing Hotel. The 2019 autumn and winter series were released under the theme of'startling dream'. Th...On March 31,a Chinese high-end women’s clothing brand Heaven Gaia was showcased in the Golden Hall of the Beijing Hotel. The 2019 autumn and winter series were released under the theme of'startling dream'. The whole release consisted of four sections,'Dancing Warblers and Butterflies in Spring','Buzzing Dragonflies in Summer','Golden Dreams of Autumn'and'Proud Plum Trees and Pines in Winter'. More than fifty sets of designs perfectly belended traditional culture elements with modern fashion, which inspired the audience and awakened their internal pride for the national culture.展开更多
Latour combines“the anthropocene”and“the Gaia Hypothesis”and comes up with his Gaia Theory:On the one hand,Latour believes that humans will be an important force in regulating the earth system;on the other hand,La...Latour combines“the anthropocene”and“the Gaia Hypothesis”and comes up with his Gaia Theory:On the one hand,Latour believes that humans will be an important force in regulating the earth system;on the other hand,Latour puts forward his own“relational ethics”,arguing that all laws or rules that Gaia follows should be realized through the interaction of actors,and“the parliament of things”can unify the domain of necessity and the domain of freedom and turn the opposition between fact and value into the difference between“taking into account”and“arranging in rank order”.His position of“relational ethics”alleviates the opposition between social construction orientation and naturalism orientation in ecological ethics.The mechanisms and principles proposed by“the parliament of things”are of great value in ecological ethics,but they are faced with problems,such as the effectiveness of representatives and whether the parliament can achieve substantial outcomes.The idea of“community of shared future for mankind”,as a Chinese plan for ecological governance,can provide new ideas for solving the above problems of“the parliament of things”.展开更多
基金supported by the National Program on Key Research and Development Project (Grant No.2016YFA0400804)the National Natural Science Foundation of China (Grant Nos.11603038,11333004,11425313 and 11403056)
文摘Machine learning has increasingly gained more popularity with its incredibly powerful ability to make predictions or calculate suggestions for large amounts of data. We apply machine learning clas-sification to 85 613 922 objects in the Gala Data Release 2, based on a combination of Pan-STARRS I and AI1WISE data. The classification results are cross-matched with the Simbad database, and the to-tal accuracy is 91.9%. Our sample is dominated by stars, ~98%, and galaxies make up 2%. For the objects with negative parallaxes, about 2.5% are galaxies and QSOs, while about 99.9% are stars if the relative parallax uncertainties are smaller than 0.2. Our result implies that using the threshold of 0 〈 σπ/π 〈 0.2 could yield a very clean stellar sample.
文摘On March 31,a Chinese high-end women’s clothing brand Heaven Gaia was showcased in the Golden Hall of the Beijing Hotel. The 2019 autumn and winter series were released under the theme of'startling dream'. The whole release consisted of four sections,'Dancing Warblers and Butterflies in Spring','Buzzing Dragonflies in Summer','Golden Dreams of Autumn'and'Proud Plum Trees and Pines in Winter'. More than fifty sets of designs perfectly belended traditional culture elements with modern fashion, which inspired the audience and awakened their internal pride for the national culture.
文摘Latour combines“the anthropocene”and“the Gaia Hypothesis”and comes up with his Gaia Theory:On the one hand,Latour believes that humans will be an important force in regulating the earth system;on the other hand,Latour puts forward his own“relational ethics”,arguing that all laws or rules that Gaia follows should be realized through the interaction of actors,and“the parliament of things”can unify the domain of necessity and the domain of freedom and turn the opposition between fact and value into the difference between“taking into account”and“arranging in rank order”.His position of“relational ethics”alleviates the opposition between social construction orientation and naturalism orientation in ecological ethics.The mechanisms and principles proposed by“the parliament of things”are of great value in ecological ethics,but they are faced with problems,such as the effectiveness of representatives and whether the parliament can achieve substantial outcomes.The idea of“community of shared future for mankind”,as a Chinese plan for ecological governance,can provide new ideas for solving the above problems of“the parliament of things”.
