EM技术在我国水环境保护中的应用研究进展   总被引：4，自引：0，他引：4  

杨怀金  谭显东  叶芝祥 《成都信息工程学院学报》2006,21(3):445-448

对EM技术在我国水环境保护中的应用情况进行了综述,重点介绍了EM技术应用于废水处理领域的研究进展,同时还展望了将来的应用及研究前景.  相似文献   

Possible chemical structures and biological precursors of different vitrinites in coal measure in Northwest China     

Dayong Liu  Ping'an Peng   《International Journal of Coal Geology》2008,75(4):204-212

Chemical structure of Jurassic vitrinites isolated from the coals in basins in NW China have been checked using solid state ¹³C NMR and flash pyrolysis-GC/MS. Study shows some Jurassic collodetrinites are rich in aliphatic products in pyrolysates, consisting with the high amount of methylene carbon in ¹³C NMR spectra. In contrast, pyrolysates of Jurassic collotelinites are rich in phenols and alkylbenzenes. Also one Pennsylvanian and one Permian vitrinite selected from the Ordos basin, NW China have been checked for comparison. The proportion of aliphatics is low in pyrolysates, and aliphatic carbon peak in ¹³C NMR spectrum of Permian vitrinite is mostly composed of gas-prone carbons compared with collodetrinites in those Jurassic basins. But both pyrolysis and ¹³C NMR data shows the Pennsylvanian vitrinite is not only gas-prone but also oil-prone. Relatively high proportion of long chain aliphatic structure of some Jurassic vitrinite in Junggar, Turpan-Hami basins may be due to the contribution of liptodetrinites, which may be included during the formation of vitrinites. And it seems that suberinite is the most possible precursor of long chain aliphatics in the structure of Jurassic collodetrinite.  相似文献   

GMOs and their contexts: A comparison of potential and actual performance of GM crops in a local agricultural setting     

A. Wendy Russell 《Geoforum》2008,39(1):213-222

In this paper, I argue that genetically modified organisms (GMOs) have inherent potential to contribute to socially and environmentally sustainable agriculture by virtue of their ‘biological embeddedness’. Their actual ‘performance’ and how this contributes to sustainability depends on the ‘mutual shaping’ of technology and context. While much attention has been given to the design context of GMOs, this paper considers the influence of the application context and of users. A case study investigating the use of insect-resistant and herbicide-tolerant GM cotton in the cotton-growing region of New South Wales in Australia is presented. The study was based on focus groups with farmers and other stakeholders in a cotton-growing community. It demonstrated a range of direct and indirect effects of GM cotton use, both positive and negative for sustainability, and the ways in which these effects were influenced by the local social context. The influences of the biotechnology industry context, in limiting the contributions that gene technologies can make to sustainability, were also considered, and remedies suggested. I argue that the polarity of the GM debate is hindering progress on these issues, and that a more balanced approach to our analysis of GMOs is necessary in order to fully understand, and to influence, their role in the future of rural spaces.  相似文献   

Contribution of the SISCam Web-based GIS to the seismotectonic study of Campania (Southern Apennines): an example of application to the Sannio-area     

Rosa Nappi  Giuliana Alessio  Giovanni Bronzino  Carlo Terranova  Giuseppe Vilardo 《Natural Hazards》2008,45(1):73-85

In this article the implementation and potential of the Seismotectonic Information System of the Campania Region (SISCam) are described, in particular an application of this Web-based GIS system to the seismotectonic analysis of the Sannio area (Southern Apennines) is performed. WEB-GIS technologies greatly contribute to both the environmental monitoring and the disaster management of areas affected by high natural risks. Specifically the SISCam system has been developed with the aim of providing easy access and fast diffusion, through Internet technology, of the most significant geological, geophysical, and territorial data relative to the Campania Region. The Sannio area has been selected as our application example because it is among the most active seismic regions in Italy. This portion of the Southern Apennines which was hit by the June 5, 1688 strong earthquake (M _W = 6.7, CPTI 1999) and by some low- and moderate-energy seismic sequences (1990–1992, 1997), is characterized by a complex inherited tectonic setting and low-tectonic deformation rates that hide the seismogenic sources position. Since this case study turned out to be complicated, the use of the SIScam WEB-GIS has become indispensable because it allowed us to visualize, integrate and analyze all the data available, in order to obtain an accurate and direct picture of the seismotectonic setting of the area. Moreover, a different approach of data analysis was necessary, due to the lack of up-to-date neotectonic and structural data; therefore, the operation of this GIS system enabled us to process and generate some original informative layers, through image analysis, such as new structural lineaments represented on a map of the potential active faults of the area, which has been the final result of our application, as a contribution to new knowledge about the local seismic risk parameters.  相似文献   

水平定向钻进非开挖铺管技术市场分析     

袁明昕 《探矿工程》2008,35(10):49-51

重点分析了近几年我国水平定向钻进铺管钻机和施工市场的发展趋势,结合国外的水平定向钻进市场发展分析,总结了我国水平定向钻进技术与市场的发展态势。  相似文献   

基于Mindlin理论Winkler地基参数的Kalman滤波识别     

张剑  叶见曙  唐修生 《岩土力学》2008,29(2):425-430

提出了Winkler地基参数的Kalman滤波识别方法。引入Mindlin理论后,推导了Winkler地基上板的控制微分方程。利用Fourier变换,推求了Winkler地基上简支板的Fourier闭式解。推导了Winkler地基参数的Kalman滤波方程,研究了Winkler地基参数的Kalman滤波识别的具体计算步骤。研究表明,运用Kalman滤波理论进行Winkler地基参数的识别,能有效地估计Winkler地基参数;Winkler地基参数的滤波收敛速度和精度受地基参数初始值选取和位移实测资料的影响,且Kalman滤波理论也可用于其他地基模型地基参数的识别。  相似文献   

从汶川地震看遥感技术在突发自然灾害中的应用     

许亚平 《贵州地质》2008,25(4)

现代遥感技术具有获取信息范围大、速度快,适应性强和信息量大等特点。"5.12"汶川地震后,交通堵塞、通信中断,遥感技术成为信息获取和灾害监测的重要手段。本文以遥感图像特征和遥感解译在汶川地震中的应用为例,阐述了遥感技术在突发自然灾害中的应用。  相似文献   

嵌入式Linux技术在海洋自动观测系统中的应用研究     

刘志勇 《海洋技术学报》2003,22(1):72-76

随着Linux技术逐步走向成熟，嵌入式Linux技术在海洋自动观测系统中的应用将全面提高海洋观测系统整体性能，降低系统开发成本，进一步推进我国海洋自动观测系统产权自主化的建设。文章就如何研制适用于海洋自动观测系统的嵌入式Linux系统进行了论述。  相似文献   

French marine technology policy : Industrializing ocean depths     

Daniel Spagni  Luke Georghiou  Michael Gibbons 《Marine Policy》1985,9(4):280-291

This paper outlines the structure of the institutions involved in scientific and technological development in France. It points to new trends in French marine policy, and gives details of the country's offshore petroleum technology and nodule mining.  相似文献   

关于我国金枪鱼围网渔业发展问题的几点探讨   总被引：7，自引：1，他引：7  

齐建军  王明彦 《海洋湖沼通报》2001,(3):58-62

本文通过对联合国粮农组织公布的1989－1998年金枪鱼渔获量的分析，清晰了我国发展金枪鱼围网渔业的趋势，并着重对于围网生产密切相关的渔场选择、捕捞技术进行了几点探讨，还对开发科研工作谈了个人看法。  相似文献