Holocene environmental change according to lake core in Fildes Peninsula of King George Island,Antarctica     

李小梅  袁宝印  赵俊琳 《极地研究(英文版)》2002,13(2)

Lake core sampled from Xihu in Fildes Peninsula of King Gorge Island, Antarctica could reveal the environmental change of the district. The lake core( GA7) , 9.28 meters long , was sectioned at an interval of 2 cm. Through measuring the organic carbon, magnetic susceptibility, granularity and organic carbon isotope of GA7, by use of 14C age it was estimated that there were four periods of high temperature in Fildes Peninsula; 4800-4400 aB. P. , 3600-3350 aB. P. ,2100 - 1800 aB. P. and 900 aB. P. - present. Meanwhile, results showed that there was a strikingly positive correlation between the content of organic carbon and that of organic carbon isotope (δC01213 ) which could be the substitute indicators of environmental temperature.  相似文献   

新生代构造运动对黄土高原地貌分异与黄河形成的控制作用   总被引：1，自引：0，他引：1  

袁宝印  汤国安  周力平  郝青振  李发源  陆中臣 《第四纪研究》2012,32(5)

黄土高原面积广大,不同区域的新生代构造演化有很大差别,根据新生代构造运动特征与沉积过程的差异,将黄土高原划分为鄂尔多斯稳定地块、陇西地区和汾渭新生代裂谷3个新生代构造运动分区.新生代构造运动控制黄土高原新生代沉积与侵蚀过程,从而产生明显地貌分异,并可划为3个一级地貌分区:1)鄂尔多斯黄土地貌区.第四纪黄土覆盖在新近纪红土梁、峁及红土盆地等古地形之上,后被侵蚀,形成复杂多变的黄土地貌景观;2)陇西黄土地貌区.主体为新近纪红土地貌,上覆少许第四纪黄土,实际为红土地貌区;3)汾渭裂谷黄土地貌区.裂谷盆地的地貌主体为河流两侧的阶地和台地,其上堆积第四纪黄土,形成不同时期的黄土台塬.鄂尔多斯周边新生代裂谷的出现控制了黄河的发育.新近纪末银呼裂谷与汾渭裂谷进入快速发展期,吕梁山相应隆起;鄂尔多斯地块西北部也轻微抬升,使古黄河初步形成并流经晋陕峡谷一带,进入三门湖并东流入海.第四纪时期早期,黄河曾长期处于河湖并存期,中更新世末,黄河溯源侵蚀使湖泊消失,并呈现目前的黄河地貌景观.  相似文献   

Trajectory Analysis and Design for A Jupiter Exploration Mission   总被引：1，自引：0，他引：1  

Chen Yang  Baoyin He-xiLi Jun-feng 《Chinese Astronomy and Astrophysics》2013

The trajectory design for a Jupiter exploration mission is investigated in this paper. The differences between the Jupiter exploration trajectory and the Mars or Venus exploration trajectory are mainly concerned about. Firstly, the selection of the Jupiter-centered orbit is analyzed based on the Galileo Jupiter mission. As for the Earth-Jupiter transfer orbit, the fuel consumption of the direct transfer is too large. So the energy-saving technologies such as the planetary gravity assist should be used for the trajectory to the Jupiter. The different sequences of planetary gravity assists are examined by applying the Particle Swarm Optimization (PSO). According to the searched result, the Venus-Earth-Earth sequence (VEEGA) is the most effective one for the Jupiter mission. During the Jupiter mission, the spacecraft will pass though the main asteroid belt between the orbits of Mars and Jupiter, and may encounter multiple asteroids. Therefore the Jupiter mission is able to combine with the main-belt asteroid flyby mission. The design method of the intermediate asteroid flyby trajectory is also considered. At last, an entire trajectory for the Jupiter mission launched in 2023 is presented.  相似文献   

The research on the remote sensing''s information tree model of the Nansha coral islets and reef''s spatial structure     

Liu Baoyin  Wang Yanfeng  Hao Qingxiang 《海洋学报(英文版)》1996,15(3):331-344

Ｔｈｅｒｅｓｅａｒｃｈｏｎｔｈｅｒｅｍｏｔｅｓｅｎｓｉｎｇ＇ｓｉｎｆｏｒｍａｔｉｏｎｔｒｅｅｍｏｄｅｌｏｆｔｈｅＮａｎｓｈａｃｏｒａｌｉｓｌｅｔｓａｎｄｒｅｅｆ＇ｓｓｐａｔｉａｌｓｔｒｕｃｔｕｒｅ￥ＬｉｕＢａｏｙｉｎ；ＷａｎｇＹａｎｆｅｎｇａｎｄＨａ...  相似文献   

A topological pattern research on recent evolution of sand spit at the Huanghe River mouth by using remote sensing informations     

Liu Baoyin  Wang Yanfeng  Gao Junguo 《海洋学报(英文版)》2000,19(2):45-55

  相似文献   

Capturing near earth objects     

He-Xi Baoyin  Yang Chen  Jun-Feng Li 《中国天文和天体物理学报》2010,10(6)

Recendy,Near Earth Objects (NEOs) have been attracting great attention,and thousands of NEOs have been found to date.This paper examines the NEOs'orbital dynamics using the framework of an accurate solar system model and a SunEarth-NEO three-body system when the NEOs are close to Earth to search for NEOs with low-energy orbits.It is possible for such an NEO to be temporarily captured by Earth; its orbit would thereby be changed and it would become an Earth-orbiting object after a small increase in its velocity.From the point of view of the Sun-Earth-NEO restricted three-body system,it is possible for an NEO whose Jacobian constant is slightly lower than C1 but higher than C3 to be temporarily captured by Earth.When such an NEO approaches Earth,it is possible to change its orbital energy to nearly the zero velocity surface of the three-body system at point L1 and make the NEO become a small satellite of the Earth.Some such NEOs were found; the best example only required a 410 m s-1 increase in velocity.  相似文献   

渤海与东海云雾屏障及其对遥感海洋信息有效性的研究     

刘宝银 《地球信息科学学报》1999,1(2):63-67

本文阐述了渤海与东海云雾屏障作用,使海区能见度降低,即使是中小尺度的海洋信息,历经多年的NOAA卫星监测,均已表明了无论空间分辨率或时间分辨率,能够较完整的获取这一遥感“天窗”信息则概率很低.笔者,结合渤海与东海的云雾和区域海洋特征,NOAA卫星信息的多波段、多时相特点,建立了信息需求分析模型,并示出渤海和东海海洋遥感“天窗”信息的概率排队.  相似文献   

萨拉乌苏组的沉积环境及地层划分问题   总被引：44，自引：0，他引：44       下载免费PDF全文

袁宝印 《地质科学》1978,13(3):220-234

鄂尔多斯高原东南部,萨拉乌苏河两岸广泛出露巨厚的第四纪河湖相沉积,自其中发现丰富的哺乳动物化石以来,便成为华北晚更新世标准地层之一,命名为萨拉乌苏组。但以前多偏重于化石和石器的研究,并将这套巨厚的河湖相沉积笼统地划为晚更新世。这种情况已远远不能满足当前生产和科研发展的要求,迫切需要从沉积物特征、沉积环境、古气候等不同角度对该地层做进一步的详细划分。作者曾有机会参加萨拉乌苏河流域第四纪地质调查及古脊椎动物化石的发掘工作。  相似文献   

人类生存与环境演变   总被引：8，自引：1，他引：7       下载免费PDF全文

刘嘉麒  吕厚远  袁宝印  靳桂云 《第四纪研究》1998,18(1):80-85

人类进化与环境演变几乎同步发生,人类与环境的相互关系大体经历了萌发、原始、冲击和协调四个时期。人类起源和生存与全球环境演变密切相关,他在环境剧变中产生,在适应环境变化中成长。当他向自然环境过分索取时,就要造成环境恶化;而恶化的环境又会给人类带来各种各样的灾难,促使人类迁移,引起民族战争和社会动荡,摧毁人类文明。人类只有协调好与环境的相互关系才能得以生存和发展。  相似文献   

五大连池药用矿泥的主要特点及其药用价值     

赵惠敏  刘嘉麒 《岩石学报》1997,13(2):266-272

五大连池药用矿泥２００目筛上样品主要由玄武质火山碎屑、石英、辉石以及其它少量晶屑组成，２００目筛下样品由伊利石、绿泥石、高岭石和石英、少量长石等多种粘土矿物组成。该矿泥应属于与本区多期火山喷发物源有关的表生泥质沉积。由于这种沉积矿泥有特殊成因，从而具有药用价值  相似文献