FACILITATING REGIONAL SUSTAINABLE DEVELOPMENT THROUGH INTEGRATED MULTI-OBJECTIVE UTILIZATION, MANAGEMENT OF WATER RESOURCES IN THE LANCANG-MEKONG RIVER BASIN     

He Daming Centre for Environmental Evolution  Sustainable Development  Yunnan Institute of Geography  Kunming  China Hsiang te Kung Memphis University  TN  USA 《地理学报(英文版)》1997,(4)

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On the DB gap of white dwarf evolution:effects of hydrogen mass fraction and convective overshooting     

Jie Su  Yan Li National Astronomical Observatories/Yunnan Observatory  Chinese Academy of Sciences  Kunming  China  Graduate University of Chinese Academy of Sciences  Beijing 《中国天文和天体物理学报》2010,10(3)

We investigate the spectral evolution of white dwarfs by considering the effects of hydrogen mass in the atmosphere and convective overshooting above the convection zone.Our numerical results show that white dwarfs with MH～10-16M⊙ show the DA spectral type between 46000■Teff■26000K and the DO or DB spectral type may appear on either side of this temperature range.White dwarfs with10-15M⊙ appear as DA stars until they cool to Teff～31000K;from then on they will evolve into DB white dwarfs as a result of conve...  相似文献   

Magnetic activity of the spotted dwarf AP149 in the α Persei open cluster     

Sze-Leung Cheung  Ho-Keung Hui  Chi-Tai Kwok  Kam-Cheung Leung 《中国天文和天体物理学报》2010,10(3)

The simultaneous photometric and spectroscopic observations of the spotted G dwarf AP149 in the young open cluster α Persei are analyzed here.We reconstruct the observed light curves with a two-starspot model by means of a light curve modeling technique,and find that the active regions shift oppositely along longitude on a time scale of one day.Combining with the observational data obtained by other groups,we discuss the evolution of spotted regions in the photosphere,and find that its starspots evolve not ...  相似文献   

WD+RG systems as the progenitors of type Ia supernovae     

Bo Wang  Zhan-Wen Han National Astronomical Observatories/Yunnan Observatory  Chinese Academy of Sciences  Kunming  China  Graduate University of Chinese Academy of Sciences  Beijing 《中国天文和天体物理学报》2010,10(3)

Type Ia supernovae(SNe Ia)play an important role in the study of cosmic evolution,especially in cosmology.There are several progenitor models for SNe Ia proposed in the past years.By considering the effect of accretion disk instability on the evolution of white dwarf(WD)binaries,we performed detailed binary evolution calculations for the WD+red-giant(RG)channel of SNe Ia,in which a carbon-oxygen WD accretes material from a RG star to increase its mass to the Chandrasekhar mass limit.According to these calcu...  相似文献   

Characteristics of infrared point sources associated with OH masers     

Jarken Esimbek 《中国天文和天体物理学报》2010,10(2)

We collect 3249 OH maser sources from the literature published up to April 2007, and compile a new catalog of OH masers. We look for the exciting sources of these masers and their infrared properties from IRAS and MSX data, and make a statistical study. MSX sources associated with stellar 1612 MHz OH masers are located mainly above the blackbody line; this is caused by the dust absorption of stellar envelopes, especially in the MSX A band. The mid-IR sources associated with stellar OH masers are concentrate...  相似文献   

多层湍流大气相位屏的数值模拟   总被引：1，自引：0，他引：1  

付玉  金振宇 《天文研究与技术》2010,7(1)

高分辨图像重建技术可以有效消除湍流大气的影响,重建目标的接近望远镜衍射极限的图像。但是当目标的视场角比较大时,大气—望远镜综合系统不再是线性空不变的,给图像重建带来新的困难,它是大气性质中的一个重要特性,对大气相位屏的模拟应该满足这一特性。提出了一种可以模拟等晕区效应的多层大气相位屏的数值模拟方法,这种方法可以应用于等晕区对高分辨统计重建方法的影响的研究中。利用该数值模拟方法模拟了5″和8″的双星的斑点图,用斑点干涉术对模拟的双星进行了重建,并与实测的双星的斑点干涉术重建结果进行了比较。比较结果表明该数值模拟方法所产生的等晕区效应与实际的等晕区效应相似。  相似文献   

大气对532nm激光影响在漫反射激光测距中的应用     

翟东升  伏红林  熊耀恒 《天文研究与技术》2010,7(1)

激光光束在大气中的传输是与大气特征有关的,如大气湍流、大气散射与吸收,而且激光测距的回波除了与距离有关外,其回波数及精度也与大气特征相关。漫反射激光测距的目标是低轨空间碎片,在一定反射截面的条件下,应用一定功率的激光进行地面靶板漫反射测距试验,以确定多少功率的激光器可实现空间碎片的漫反射测距,这时地面靶的距离选取应该具有代表性,它代表了在一定斜程下穿过整个大气层的效应。通过对大气湍流和大气衰减对激光传输的影响进行分析,理论上计算出在低轨目标为400km时,漫反射激光测距试验地面靶的水平距离该取多远时才能代表在一定斜程下穿过400km大气层的效应,从而为漫反射激光测距试验地面靶距离的选取提供参考依据。  相似文献   

中国低纬地区地磁场Z分量日变特征     

张永忠  康国发 《地震地磁观测与研究》1995,16(2):19-23

根据我国低纬地区的台站资料，分析了地磁场Ｚ分量的静日变化特征，得到的主要结果是：（１）日变幅随季节和太阳黑子数的变化而变化；（２）低点出现时间大约在地方时１２时左右，并随季节有所变化；（３）最大值出现时间大约在地方时６时左右，在赤道电射流影响区其受季节的影响较大。  相似文献   

Devonian to Triassic Successions of the Changning-Menglian Belt, Western Yunnan, China     

JIN Xiaochi  WANG Yizhao  XIE GuanglianInstitute of Geology  Chinese Academy of Geological Sciences  Baiwanzhuang Ro  Beijing  Geological Survey of Yunnan  Yujiang Ro  Yuxi  Yunnan 《《地质学报》英文版》2003,77(4):440-456

Phanerozoic strata are distributed in several north-south trending zones in the central part of the Changning-Menglian Belt. Four types of Devonian to Triassic stratigraphic successions can be identified: (1) elastics with limestone lenses in the mid-section, changing up-section into alternations of fine elastics and cherts; (2) elastics with chert intercalations and limestone lenses, and topped by Permian basic volcanics; (3) elastics-basic volcanics-carbonates-clastics; and (4) limestones, dolomitic limestones-dark gray thin-bedded limestones, argillaceous limestones, mudstones and siliceous mudstones. Devonian to Triassic cherts occur in different horizons and different zones from east to west. These cherts are usually transitional to their neighboring elastics. There is no continuous Devonian to Middle Triassic chert sequence in the central zone of the Changning-Menglian Belt as Liu et al. (1991,1993) reported. Volcanics and the overlying carbonates described by some workers as "seamount" sequences  相似文献   

信息化时代地震观测技术的产业化问题     

周挚  山秀明  任勇  李倩  王征  郭天乐 《国际地震动态》2004,(6):8-14

国家间的竞争集中表现为前瞻性技术领域的竞争，占领技术制高点成为各国国家发展的基本取向。本文结合地震观测现状和现代信息网络技术、自动化控制技术的进展，概述了地震观测技术产业化发展的社会需求和科学需求，从国家科技发展战略层次上初步探讨了地震观测技术产业化发展的重要性和必然性。  相似文献