Glacier changes from 1975 to 2016 in the Aksu River Basin,Central Tianshan Mountains     

Zhang  Qifei  Chen  Yaning  Li  Zhi  Li  Yupeng  Xiang  Yanyun  Bian  Wei 《地理学报(英文版)》2019,29(6):984-1000

Journal of Geographical Sciences - In this study, we analyzed glacier changes in the Aksu River Basin during the period 1975–2016, based on Landsat MSS/TM/ETM+/OLI imagery analysis and the...  相似文献   

星系团的光学研究(Ⅰ):星系团表、大尺度分布、团的一般性质     

卞毓麟 《天文学进展》1995,(4)

星系团研究涉及面极广，此处仅简介光学研究的若干方面。全文分为两篇，本篇中介绍星系团表、星系团的大尺度分布、星系团的一般性质；第二篇中将介绍团星系的演化、环境与星系形态，并作简要的展望。  相似文献   

星系团的射电研究进展     

韩金林  卞毓麟 《天文学进展》1995,13(2):143-151

我们从四个方面综述星系闭的射电研究进展。首先介绍了星系闭中的分立射电源，特别是ｃＤ星系研究的一些最新进展和结果。继而介绍了星系闭中射电晕的分类、目前的观测结果和理论解释。星闭中的磁场主要由射电研究得出，在本文中对此也作了适当的介绍和讨论。最后还简介了在星系闭射观测中发现的ｒｅｌｉｃ射电源。  相似文献   

Earth Summit Mission 2022: Scientific Expedition and Research on Mt. Qomolangma Helps Reveal the Synergy between Westerly Winds and Monsoon and the Resulting Climatic and Environmental Effects     

Yaoming MA  Weiqiang MA  Huaguang DAI  Lei ZHANG  Fanglin SUN  Jinqiang ZHANG  Nan YAO  Jianan HE  Zhixuan BAI  Yuejian XUAN  Yunshuai ZHANG  Yuan YUAN  Chenyi YANG  Weijun SUN  Ping ZHAO  Minghu DING  Kongju ZHU  Jie HU  Bian Bazhuga  Bai Juepingcuo  Zhuo Ma  Ren Qingnima  Suo Langwangdui  Yang Zong  Haikun WEN 《大气科学进展》2023,40(2):187-193

“Earth summit mission 2022” is one of the landmark scientific research activities of the Second Tibetan Plateau Scientific Expedition and Research(STEP). This scientific expedition firstly used advanced technology and methods to detect vertical meteorological elements and produce forecasts for mountain climbing. The “Earth summit mission 2022”Qomolangma scientific expedition exceeded an altitude of over 8000 meters for the first time and carried out a comprehensive scientific investigation missi...  相似文献   

中国南方海相生烃成藏研究的若干新进展(一) 南方四套区域性海相烃源岩的分布   总被引：32，自引：1，他引：31  

梁狄刚  郭彤楼  陈建平  边立曾  赵喆 《海相油气地质》2008,13(2):1-16

通过对上、中、下扬子区121个地表及钻井剖面烃源岩的密集扫描取样和地化分析,系统研究了下寒武统、上奥陶统—下志留统、上二叠统、下二叠统四套区域性海相烃源岩的厚度及有机质丰度的纵横向分布,明确了海相烃源岩在纵向上以下寒武统和上二叠统为最好,横向上以上扬子区为最好,其次为下扬子区;确定了五个烃源岩发育区。明确了海相烃源岩以泥岩为主,碳酸盐岩烃源岩只出现在下二叠统栖霞组—茅口组,实测最大厚度为150m,从而表明中国南方不存在上千米厚的碳酸盐岩烃源岩。对四套海相烃源岩的厚度问题、层位问题、原始生烃潜量和碳酸盐岩烃源岩的鉴别问题等提出了认识。  相似文献   

Cycled efficient V-BLAST GNSS ambiguity decorrelation and search complexity estimation     

Wu  Zemin  Li  Houpu  Bian  Shaofeng 《GPS Solutions》2017,21(4):1829-1840

GPS Solutions - Decorrelation reduction and search techniques play important roles in solving integer ambiguities of global navigation satellite system (GNSS) positioning. This contribution focuses...  相似文献   

Effect of Urbanization on Land-Surface Temperature at an Urban Climate Station in North China   总被引：1，自引：0，他引：1  

Tao Bian  Guoyu Ren  Yanxia Yue 《Boundary-Layer Meteorology》2017,165(3):553-567

While the land-surface temperature (LST) observed at meteorological stations has significantly increased over the previous few decades, it is still unclear to what extent urbanization has affected these positive trends. Based on the LST data recorded at an urban station in Shijiazhuang in North China, and two rural meteorological stations, the effect of urbanization at the Shijiazhuang station for the period 1965–2012 is examined. We find, (1) a statistically-significant linear trend in annual mean urban–rural LST difference of \(0.27\,^{\circ }\hbox {C}\) \(\hbox {(10 year)}^{-1}\), with an urbanization contribution of 100% indicating that the increase in the annual mean LST at the urban station is entirely caused by urbanization. The urbanization effects in spring, summer and autumn on the trends of mean LST are also significant; (2) the urbanization effect is small for time series of the annual mean minimum LST, and statistically marginal for the trend in annual mean maximum LST [\(0.19\,^{\circ }\hbox {C}\,\hbox {(10 year)}^{-1}\)]; (3) the urbanization effect on the annual mean diurnal LST range (\(\Delta {LST}\)) at the urban station is a strongly significant trend of \(0.23\,^{\circ }\hbox {C (10\,year)}^{-1}\), with an urbanization contribution of 21%. The urbanization effects on trends in the spring and autumn mean \(\Delta {LST}\) are also larger and more significant than for the other seasons; (4) the urbanization effects on the long-term LST trends are remarkably different from those on the near-surface air temperature at the same urban station. Nonetheless, the significant warming of the urban boundary layer is expected to affect the urban environment and ecosystems. However, the problem of data representativeness at an urban station for the monitoring and investigation of large-scale climate change remains.  相似文献   

Influences of elevated heating effect by the Himalaya on the changes in Asian summer monsoon     

He  Bian 《Theoretical and Applied Climatology》2017,128(3-4):905-917

Theoretical and Applied Climatology - Based on a series of topographical and thermal sensitivity experiments, the physical processes on the changes of Asian summer monsoon caused by the Himalaya...  相似文献   

内蒙古大兴安岭林区极端气温事件变化特征   总被引：2，自引：1，他引：1  

张秋良  边玉明  代海燕  王冰  冯丽红  王美媛 《地理科学》2017,37(12):1909-1916

利用内蒙古大兴安岭林区11个气象站1971~2014年日平均气温数据,采用线性趋势、Morlet小波分析、克里金插值法对内蒙古大兴安岭林区极端气温的年变化进行分析。研究表明：极端高温天气和生物生长季天数在20世纪80年代中期以后呈显著增多趋势,极端低温天气呈显著减少趋势;在空间分布上,所有站点极端高温天气和生物生长季天数呈上升趋势,极端低温天气呈下降趋势,但空间差异明显。极端低温天气主要受27、18、11、7 a时间尺度周期影响。极端高温天气28 a左右周期振荡最为强烈,视为第一主周期,对极端高温天气影响最为显著,在2018年以后的大约8 a间（2019~2026年）极端高温天气可能会更加频繁。生物生长季受28 a时间尺度周期影响,且在2015~2022年生物生长季天数增长处于偏大期。  相似文献   

乌拉山金矿钾长石的标型性及其与金矿化关系   总被引：6，自引：0，他引：6  

边秋娟  张汉凯 《黄金地质》1997,3(3):8-15

在对乌拉山石英－钾长石脉型这一国内外尚不多见的新类型金矿床的野外观察和室内镜下研究的基础上，通过选择性地对其主要矿物钾长石进行电子探针分析，Ｘ射线粉晶衍射分析，红２外吸收光谱测定及可见光吸收光谱分析，系统详尽地了钾长石的产状，形态，化学成分，结构态及可见光吸收光谱特征，提取了作为找寻石英－钾长石脉型金矿床的重要矿物学标志，并进一步探讨了钾长石与金矿化的关系。  相似文献