|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 水热条件下Y型沸石的转晶行为显示文摘系统研究了以KOH为结构导向剂,Y型沸石(HY和NaY)在水热条件下转晶为MER型沸石的行为.MER型沸石是硅铝比(Si/Al)在2~3之间且具有四种尺寸8元环孔道(3.1?×3.5?,2.7?×3.6?,3.4?×5.1?,3.3?×3.3?)的硅铝沸石分子筛,在小分子催化以及分离方面具有重要的潜在应用.传统水热法合成高结晶度MER型沸石需要7~10 d,将Y型沸石置于KOH的溶液中,经水热处理可在2 d内生成高结晶度的MER型沸石,而水热处理具有等价摩尔组成的无定形硅铝凝胶则得不到高结晶度MER型沸石的纯相.HY沸石可在100和150℃发生转晶,而Na Y则只能在150℃发生转晶.KOH/SiO_2比和H_2O/SiO_2比对Y型沸石的转晶行为有重大的影响,只有在最优KOH/SiO_2比和H_2O/SiO_2比条件下才能生成高结晶度的MER型沸石.该转晶合成法显著缩短了MER型沸石的合成周期,对缩短其它有重大工业应用价值的沸石分子筛的合成周期有重要的借鉴意义. | 胡成玉 闫文付 徐如人 | 2017 | 化学学报2017，75，7： | 6 |
| 2 | Thirty Meter Telescope Detailed Science Case:2015 Warren Skidmore on behalf of the TMT International Science Development Teams &TMT Science Advisory Committee显示文摘The TMT Detailed Science Case describes the transformational science that the Thirty Meter Telescope will enable.Planned to begin science operations in 2024,TMT will open up opportunities for revolutionary discoveries in essentially every field of astronomy,astrophysics and cosmology,seeing much fainter objects much more clearly than existing telescopes.Per this capability,TMT’s science agenda fills all of space and time,from nearby comets and asteroids,to exoplanets,to the most distant galaxies,and all the way back to the very first sources of light in the universe.More than 150 astronomers from within the TMT partnership and beyond offered input in compiling the new 2015 Detailed Science Case.The contributing astronomers represent the entire TMT partnership,including the California Institute of Technology(Caltech),the Indian Institute of Astrophysics(IIA),the National Astronomical Observatories of the Chinese Academy of Sciences(NAOC),the National Astronomical Observatory of Japan(NAOJ),the University of California,the Association of Canadian Universities for Research in Astronomy(ACURA)and US associate partner,the Association of Universities for Research in Astronomy(AURA). | Thirty Meter Telescope International Observatory | 2015 | Research in Astronomy and Astrophysics2015，15，12： | 2 |
| 3 | A sample of metal-poor galaxies identified from the LAMOST spectral survey显示文摘We present a sample of 48 metal-poor galaxies at z < 0.14 selected from 92 510 galaxies in the LAMOST survey. These galaxies are identified by their detection of the auroral emission line[OⅢ]λ4363 above the 3σ level, which allows a direct measurement of electron temperature and oxygen abundance. The emission line fluxes are corrected for internal dust extinction using the Balmer decrement method. With electron temperature derived from [OⅢ]λλ4959, 5007/[OⅢ]λ4363 and electron density from [SⅡ]λ6731/[SⅡ]λ6717, we obtain the oxygen abundances in our sample which range from 12 + log(O/H) = 7.63(0.09 Z_⊙) to 8.46(0.6 Z_⊙). We find an extremely metal-poor galaxy with 12 + log(O/H) = 7.63 ± 0.01. With multiband photometric data from FUV to NIR and Hαmeasurements, we also determine the stellar masses and star formation rates, based on the spectral energy distribution fitting and Hα luminosity, respectively. We find that our galaxies have low and intermediate stellar masses with 6.39 ≤ log(M/M_⊙) ≤ 9.27, and high star formation rates(SFRs) with-2.18 ≤ log(SFR/M_⊙yr^(-1)) ≤ 1.95. We also find that the metallicities of our galaxies are consistent with the local T_e-based mass–metallicity relation, while the scatter is about 0.28 dex. Additionally,assuming the coefficient of α = 0.66, we find most of our galaxies follow the local mass–metallicity–SFR relation, but a scatter of about 0.24 dex exists, suggesting the mass–metallicity relation is weakly dependent on SFR for those metal-poor galaxies. | Yu-Long Gao Jian-Hui Lian Xu Kong Ze-Sen Lin Ning Hu Hai-Yang Liu En-Ci Wang Zi-Huang Cao Yong-Hui Hou Yue-Fei Wang Yong Zhang | 2017 | Research in Astronomy and Astrophysics2017，17，5： | 0 |
| 4 | Structural,Morphological and Optical Properties of Well-Ordered CdO Nanostructures Synthesized by Easy-Economical Chemical Bath Deposition Technique显示文摘In this Study,Cadmium Oxide(CdO)nanostructures were synthesized by using Chemical Bath Deposition Technique.The synthesized process was carried out at room temperature.The structural and optical properties of nanostructures was characterized by XRD,SEM and UV-Vis techniques.As a result,the CdO nanostructures are oriented along(111)plane of cubic crystal structure.The morphology of CdO nanostructures showed interconnected prism-like and cauliflower-type cluster nanostructure.The UV results of this structures with high absorbtion coefficient are observed to be in accordance with the CdO nanoparticles. | Sibel Morkoc Karadeniz Tuba Kιlιnc Burcu Bozkurt Cιrak Tuba Irmak Sakaoglu Cagrι Cιrak Mehmet Ertugrul Ali Ercan Ekinci | 2016 | 光谱学与光谱分析2016，36，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员