中老泰铁路建设对云南省及沿线国家空间联系格局的影响

中老泰铁路作为泛亚铁路东、中、西三线的中线,对中国与老挝、泰国的跨境合作以及助推“一带一路”倡议的“中国-中南半岛”经济走廊的建设起着重要作用。选取中国云南省和老挝、泰国作为研究区域,以非障区的区域开发为基础,并选取铁路沿线15个主要城市,基于城市流网络视角对比铁路建设前后区域可达性与城市流网络的变化,结果显示：铁路建成将提升障区可进入性与非障区可开发性,提高区域互联开发潜力,提升研究区内可达性。可达性呈现以铁路线路为轴向周围辐射递减的格局,但泰国西部及老挝东部自然障区可达性提升效果甚微;铁路将增强城市间联系强度,实现“树状-网状”的城市流网络形态高效重构,网络发育更加成熟稳固;铁路也使得网络结构扁平化、分散化,流网络重构过程中资源的分散与耗散并存,城市间联系效率下降。     

美国与欧洲新一代静止气象卫星上用的辐射计

1.引言自从1960年4月TIROS-1号卫星发射上天,开始装载光导摄象管摄象机和辐射计进行观测以来,世界上已经发射了许多气象卫星。利用气象卫星观测也和其他观测一样,以获得高精度的定量分析资料为目的。为此,这些年来对于气象卫星上装载的仪器,不仅改进了空间分辨率,采用多通道和高频     

Ruthenium-ion-catalyzed oxidation of asphaltenes and oil-source correlation of heavy oils from the Lunnan and Tahe oilfields in the Tarim Basin, NW China

The identification of marine source rocks in the Tarim Basin is debated vigorously. The intention of this paper is to investigate the asphahenes in heavy oils from the Lunnan and Tabe oilfields and Well TD2 with ruthenium-ions-catalyzed oxidation technique (RICO), in order to explore its role in oil-oil and oil-source correlations, The RICO products included n-alkanoic acids, α,ω-di-n-alkanoic acids, branched alkanoic acids, tricyclic terpanoic acids, hopanoic acids, gammacerane carboxylic acid , regular sterane carboxylic acids and 4-methylsterane carboxylic acids. The n-alkyl chains and biomarkers bounded on the asphaltenes were of unsusceptibility to biodegradation. The distribution and absolute concentrations of n-alkanoic acids in the RICO products of heavy oils from the Lunnan and Tabe oilfields are different from those of Well TD2. The biomarkers bounded on the asphahenes, especially steranes, have a distribution trend similar to that of the counterparts in saturates. The sterane carboxylic acids and 4-methylsterane carboxylic acids in the RICO products of heavy oils from the Lunnan and Tahe oilfields, dominated by C30 sterane and C31 4-methylsterane carboxylic acids, respectively, are significantly different from those of the heavy oils of Well TD2, whose dominating sterane and 4-methylsterane carboxylic acids are C28 sterane and C29 4-methylsterane acids, respectively. The RICO products of the asphaltenes further indicate that the Middle-Upper Ordovician may be the main source rocks for heavy oils from the Lunnan and Tabe oilfields.     

日本京都大学足立纪尚教授来我所讲学概况

根据中国科学院与日本学术振兴会的学术交流备忘录,日本京都大学足立纪尚教授于1986年3月6日至3月19日来华进行学术交流。3月10日至3月12日来我所参观访问并作了三次学术报告:第一讲,软岩的力学特性;第二讲,软岩的本构模型;第三讲,青函隧道灌浆形式的决定和砂土质山体浅埋隧道的特点。足立纪尚教授是日本京都大学工学部交通土木工程系路基工程研究室教授,曾获美国加     

“落雁”之美美人溢美汉宫 倾世之美丽人誉美塞中 娇艳之美佳人冠美王廷 美女王昭君谁人不抢而其出塞吹亮了一串地名美彩

王昭君是中国西汉时期的一位伟大的女性,为了国家安定民族团结,她深入大漠,与匈奴和亲,为汉朝的边关稳定做出了巨大贡献。她那如花似玉之貌令国人为之倾倒,她那无私无畏的奉献精神为国人所崇敬。昭君出塞沿途所经过的地方,一串串亮丽的地     

创新,让危岩治理有声有色——广西大化瑶族自治县创造性开展危岩治理侧记

北景乡那色村板江屯地势险要、危岩耸立,对居住在此的35户170人构成了严重威胁。上级补助资金下达后,当地干部群众投工投劳,对危岩进行加固治理,施工规模682立方米,有效消除了安全隐患。