四川巴縣新開市和尚坡洞穴地層之發現及其意義

關於嘉陵江下游新生代地史,最近有一顯著之進步,卽重慶西之背斜層東翼,沿成渝公路之新開市附近和尚坡地方,有合骨化石洞穴層之發見。由此發見,使吾人對此區地史與地文之演變,得一古生物根據,從此而可修正以前若干解說,並可     

路南新生代地質

雲南各地,間山盆地甚多,路南即爲其一。路南盆地中主要地層爲紅色岩系。此等紅色岩系,以前地質學者,多視爲二疊紀上部(戴普拉)(安寧系朱庭祜)。二十六年卞美年於赴邱北途中,在路南城北約五里之山坡,獲得雷(?)及古豬與龜鳘類化石若干,首次證明路南有第三紀初期地層之存在。因時局關係,此項地層與化石之研究,均未能即時問世。邇來地質調查     

新採集之脊椎動物化石簡報

一年以來,關於新生代骨化石之採集與研究,續有進展。除賈蘭坡在四川,技工王存義在河北邢台西所獲標本爲前所採集,新經研究者外;關於第三紀初期者,李悅言在河南盧氏,卞美年在雲南曲靖及魯南,均獲有確切無疑之始新統或漸新統     

新生代地質研究与經濟地質

在地質研究中,新生代地質,向來是最易被人忽略的一部分,早年的地质報告中,提到第三纪第四纪地層,每以数十字成十餘字了之,最普遍的無非是紅色岩系或第三紀初期砂岩,三趾馬紅土或黄土等而已。一般的地质调查,多注意新生代以前地層,故此等现象,本無足怪。     

Spatiotemporal variations of cultivated land use efficiency in the Yangtze River Economic Belt based on carbon emission constraints

In this study,the carbon emissions(CEs)from cultivated land(CL)were included as an undesirable output in the utilization efficiency of such land.A slack-based model was used to calculate the CL use efficiency(CLUE)for 11 provinces and cities in the Yangtze River Economic Belt(YREB)from 2007 to 2016,and then a kernel density estimation map was drawn to analyze the spatiotemporal variations of CLUE.The Tobit model was also employed to analyze the factors affecting the CLUE.The results show the following.1)In the YREB,the CEs from CL showed a rising and then a slowly decreasing trend.In this paper,we calculate CEs by carbon emission factors and major carbon sources,and the CEs from CL in the YREB totaled 25.2354 million tons in 2007.By 2014,the value had increased gradually to 28.4400 million tons,and by 2016 it had declined to 27.8922 million tons,suggesting that the carbon-emission reduction measures of the government had an impact.2)The CLUE of various provinces and cities in the YREB showed an upward trend in the time dimension,while for the spatial dimension,the kernel density was high in the east and low in the west,and the areas with high kernel density were mainly located in the Yangtze River Delta.3)The per capita gross domestic product,the primary industrial output,and the number of agricultural technicians per 10,000 people had positive effects on the CLUE.The CL area per capita and the electrical power per hectare for agricultural machinery had significant negative impacts on CLUE.In addition,every 1%increase in the number of agricultural technicians increased the CLUE by 0.057%.     

国际气候变化研究趋势

以全球变暖为显著特征的气候变化现象引起了政府、公众和科学界的广泛关注。近年来,一系列极端气候事件更使气候变化成为一个全球性的重大议题。2009年哥本哈根会议中的争论表明,气候变化已经超出一般的环境或气候领域,是涉及到新的     

北京市平原区地下水水质概况

随着首都城市规模的不断扩大 ,经济的快速发展 ,城市人口的不断增长 ,导致地下水资源匮乏和地下水环境污染。为此 ,地下水环境资源优劣将直接影响首都的发展、市民的生活及社会的安定     

������-����-�������ؿǽṹ������7.1������

??????????-????-???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????壻?????????????????μ?????????????????壬?????????????????????????????????′??????????壻????????????????????????????     

既有砌体结构基于性能的抗震加固研究

对结构1和结构2分别进行人工波、天津波和迁安波作用下的多遇烈度、设防烈度和罕遇烈度时程分析,对不满足性能目标要求者进行抗震加固分析。加固结果表明：①加固后最大位移角所在楼层位置出现下移现象;②上层加固效果比下层加固效果明显;③结构有无圈梁和构造柱对抗震性能的影响较大,圈梁和构造柱的截面尺寸变化对抗震性能的影响较小;④加固效果随地震波不同而不同,采用相同的加固方案加固效果不同;⑤必须根据具体的鉴定结果选用合理的加固方案,否则适得其反。     

靈活吊錘

在处理夹鑽和埋鑽事故时,为能迅速地安設好吊錘,我队張維輝同志設計了一种可以开合的灵活吊錘,可以用到各种規格的鑽机上,特别是适用于100公尺以下的小鑽机。