南极洲泥盆系概况及其与中国泥盆系之比较          下载免费PDF全文

廖卫华 《极地研究》1995,7(2):35-40

南极洲的泥盆系主要分布于横贯南极山脉的麦克默多和俄亥俄岭－埃尔斯沃思山等两个沉积盆地中。前一个盆地的泥盆系代表从海岸泻湖－河流三角洲到近岸冲积平原的层序；后一个盆地的彭萨科拉山的泥盆系较厚，从非海相冲积扇－冲积平原－浅海相，最后又恢复到非海相沉积环境，但在俄亥俄岭却沉积了厚度不大的浅海相地层，含Ｍａｌｖｉｎｏｋａｆｒｉｃ生物地理大区的海相双壳类、腹足类、三叶虫、竹节石和鱼类等化石。除了上述两个沉积盆地外，在罗斯海两边却出露了火山岩，说明该地当时处于俯冲带附近的火山弧中。中国华南的曲靖型和西北的祁连山型泥盆系也属于滨海相和非海相沉积，它们与南极洲的泥盆系可资比较，但两者的生物地理区系并不相同  相似文献   

Risk management of BTEX contamination in ground water--an integrated fuzzy approach     

Qin XS  Huang GH  Li YP 《Ground water》2008,46(5):755-767

An integrated fuzzy simulation-assessment method (FSAM) was developed for assessing environmental risks from petroleum hydrocarbon contamination in ground water. In the FSAM, techniques of fuzzy simulation and fuzzy risk assessment were coupled into a general framework to reflect a variety of system uncertainties. A petroleum-contaminated site located in western Canada was selected as a study case for demonstrating applicability of the proposed method. The risk assessment results demonstrated that system uncertainties would significantly impact expressions of risk-level outputs. A relatively deterministic expression of the risks would have clearer representations of the study problem but may miss valuable uncertain information; conversely, an assessment under vaguer system conditions would help reveal potential consequences of adverse effects but would suffer from a higher degree of fuzziness in presenting the modeling outputs. Based on the risk assessment results, a decision analysis procedure was used to calculate a general risk index (GRI) to help identify proper responsive actions. The proposed method was useful for evaluating risks within a system containing multiple factors with complicated uncertainties and interactions and providing support for identifying proper site management strategies.  相似文献   

郑州冬季黑碳气溶胶浓度变化特征及其与风速风向的关系     

秦亚兰  郑丹  周顺武  等. 《气象与环境科学》2021,44(1):13-20

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Joint observation of long period tremor signals with broadband seismometer,tiltmeter and gravimeter     

张雁滨  蒋骏  廖盈春  李胜乐  钟铁涛 《地震学报(英文版)》2008,21(6):629-635

We report here the observation result of joint observation of long period tremor signals with broadband seismome-ter,tiltmeter and gravimeter at the HUST(Huazhong University of Science and Technology)station.The observed data were compared and analyzed.Since 2005,the several tens of abnormal tremor signals which are weak,com-plex and duration of 2 to 3 days have been synchronously recorded by the different instruments.The tremor signals have the periodic domain in the range of 3 to 5 minutes,20 to 30 minutes and even more than 1 hour.The observa-tion shows such tremors are a physical existence.The analysis indicates that a part of the tremors caused by the typhoon from the western Pacific Ocean.These tremors have a close relationship with wind velocity of typhoon and distance between the typhoon center and the station.Except these,the cause of others is still unclear.  相似文献   

基于VBA开发的电磁波观测资料管理软件     

廖华康  陈淑贞 《地震地磁观测与研究》2008,29(1):109-114

本地震前兆电磁波观测数据处理软件（DCB软件）是一个基于Excel数据平台,用VBA编写的管理软件。本软件具有数据自动录入、数据库管理、绘图和打印等功能。以Excel作为数据处理平台的DCB软件具有以下优点：操作简单、数据直观、制作图表方便、便于数据管理、分析统计、传递交流,等等。VBA程序则具有容易学习、理解,方便修改等优点。  相似文献   

珠江三角洲地区重磁资料解释的深部断裂系统   总被引：1，自引：0，他引：1  

任镇寰  廖桂金  胡云中  项颖 《国际地震动态》2008,(11)

采用中国地质大学(武汉)完成的海洋863项目"海洋深部地壳探测技术"专题"重磁地震综合反演的方法技术及软件系统"中的软件(包括10多种方法技术),对珠江三角洲地区重磁资料进行数据处理,有效成图重力71幅,航磁88幅,共129幅.  相似文献   

潮汐测量中异常“震颤”信号的综合观测试验与挖掘   总被引：4，自引：0，他引：4  

蒋骏  张雁滨  廖盈春  李胜乐  钟铁涛 《国际地震动态》2008,(11)

潮汐测量包含倾斜、应变和重力固体潮等,与地震观测具有共同的物理本质,观测量都与地壳运动有直接力学关系.两者的观测信号在频率域相互重叠、自然衔接,覆盖了从地震波至固体潮频段的所有地动信息.  相似文献   

Natural gas geochemistry and its origins in Kuqa depression     

QuanYou Liu  ShengFei Qin  Jian Li  WenHui Liu  DianWei Zhang  QingHua Zhou  AnPing Hu 《中国科学D辑(英文版)》2008,51(1):174-182

According to gas compositional and carbon isotopic measurement of 114 gas samples from the Kuqa depression, accumulation of the natural gases in the depression is dominated by hydrocarbon gases, with high gas dryness (C₁/C_1–4) at the middle and northern parts of the depression and low one towards east and west sides and southern part. The carbon isotopes of methane and its homologues are relatively enriched in ¹³C, and the distributive range of δ ¹³C₁, δ ¹³C₂ and δ ¹³C₃ is ?32‰–?36‰, ?22‰–?24‰ and ?20‰–?22‰, respectively. In general, the carbon isotopes of gaseous alkanes become less negative with the increase of carbon numbers. The δ ¹³ \(C_{CO_2 } \) value is less than ?10‰ in the Kuqa depression, indicating its organogenic origin. The distributive range of ³He/⁴He ratio is within n × 10^?8 and a decrease in ³He/⁴He ratio from north to south in the depression is observed. Based on the geochemical parameters of natural gas above, natural gas in the Kuqa depression is of characteristics of coal-type gas origin. The possible reasons for the partial reversal of stable carbon isotopes of gaseous alkanes involve the mixing of gases from one common source rock with different thermal maturity or from two separated source rock intervals of similar kerogen type, multistages accumulation of natural gas under high-temperature and over-pressure conditions, and sufficiency and diffusion of natural gas.  相似文献   

Production of Levulinic Acid from Bagasse and Paddy Straw by Liquefaction in the Presence of Hydrochloride Acid     

Lifeng Yan  Naikun Yang  Hao Pang  Bing Liao 《洁净——土壤、空气、水》2008,36(2):158-163

A method of levulinic acid production from bagasse and paddy straw is presented. Biomass waste was mixed with hydrochloride acid and water, and then liquefied at about 200°C in a pressurized reactor. Both the mass of the biomass and the amount of hydrochloride acid were kept as constants, and the effects of temperature, reaction time, and acid concentration on the levulinic acid yield were studied. It was found that the yield of levulinic acid was maximum when the reaction temperature was carried out for 45 min at 220°C using 4.45% concentration of hydrochloride acid, and the maximum yields of levulinic acid were 22.8 and 23.7% for bagasse and paddy straw, respectively. The products were analyzed using NMR, HPLC, and GC/MS.  相似文献   

隧道信息化施工岩溶裂隙水超前地质预报   总被引：7，自引：0，他引：7  

薛翊国  李术才  张庆松  李树忱  苏茂鑫  刘斌  刘钦 《岩土力学》2008,29(12):3360-3364

隧道突水是岩溶地区隧道信息化施工过程中经常遇到的一类地质灾害,给施工安全带来了重大危害和经济损失,因此,对隧道掌子面前方的岩溶裂隙水进行准确及时的超前预报,是岩溶地区隧道动态设计与信息化施工中亟待解决的重要问题,具有重要的理论意义和重大的工程实用价值。总结了隧道信息化施工中岩溶裂隙水超前预报方法,重点介绍了在水文地质分析的基础上,综合运用TSP预报系统和红外探水法两种方法对某特长公路隧道岩溶裂隙水进行了工程实例探测,收到了良好的预报效果,对类似工程具有一定的指导意义。  相似文献