地下水中气体变化与地震的关系     

田春兰  王彩云 《山西地震》1996,(4):41-43

对山西大同—阳高６．１级地震、甘肃天祝６．２级地震前山西夏县热水井和宁夏固原北海孔、硝口Ⅰ泉的气体观测资料进行了处理，识别出其中的异常。分析表明，地下水气体异常变化与地震有一定的相关性  相似文献   

Determination of the 13C/12C Isotope Ratio of Organic Compounds for the Biological Degradation of Tetrachloroethene (PCE) and Trichloroethene (TCE)     

S. Ertl  F. Seibel  L. Eichinger  F. H. Frimmel  A. Kettrup 《洁净——土壤、空气、水》1996,24(1):16-21

With the method used here, it was possible to determine the isotope content of both the initial compounds and their metabolites formed due to microbial degradation. The chemical analysis showed that the dominating degradation metabolite for both PCE and TCE degradation was cis-1,2-dichloroethene (cis-1,2-DCE). Apart from this, the formation of TCE, trans-1,2-DCE, 1,1-DCE, chloroethene (VC), ethene and ethane was observed. The isotope analysis showed no measurable fractionation of stable carbon isotopes, for the microbial degradation of PCE and TCE to cis-1,2-DCE. There was a small effect for trans-1,2-DCE and a stronger one for VC as metabolite of TCE.  相似文献   

X辐射取样技术的研究和应用     

侯胜利  葛良全 《现代地质》1996,10(2):279-284

论述了Ｘ辐射取样技术的物理基础，对Ｘ辐射取样中存在的３个关键性技术问题：不平度效应、不均匀效应和基体效应，进行了系统的分析和研究，提出了解决问题的方法技术，展示了Ｘ辐射取样技术在金、锡、铜矿种的普查、勘探和矿山开采各阶段的应用效果。  相似文献   

核地球物理学X辐射取样技术研究和应用     

章晔  程业勋  葛良全  候胜利  陈友红 《物探与化探》1996,20(1):23-27

本文论述了X辐射取样技术的物理基础。对X辐射取样中存在的三个关键性技术问题：不平度效应、不均匀效应和基体效应,进行了系统地分析与研究,提出了解决问题的方法技术,并成功地应用于金、锡和铜矿种的普查、勘探和矿山开采各阶段,能满足生产部门的要求。  相似文献   

线阵CCD采集系统的非线性度测量     

刘明华  余模智  何平安  黄巧林 《武汉大学学报(信息科学版)》1996,(4)

基于对光辐射的响应电压的测试，提出一种对线阵ＣＣＤ采集系统光电变换非线性度测试的实验方法，并给出装置及测试结果。实验表明，该方法准确可靠，快速方便，自动化程度较高  相似文献   

Calculation of Ice Crystal Diffraction     

Liu Chunlei  Yao Keya 《大气科学进展》1996,13(3):340-348

The diffraction angular distributions are calculated for different ice crystals (e.g,solid and hollow hexagonal columns,solid plates and single hexagonal bullet) randomly oriented in space,based on the theory of Cai and Liou.Results of solid column and plate are compared with those from formulas of Wendling et al and Liou.The resull comparison shows that all three procedures discussed in this paper have good agreement.After considering the coin putation time and comparison results,it is suggested that the formula of Wendling et al.can be used to calculate the solid column diffraction,and the formula of Liou can be used to calculate the plate diffraction.The comparison also shows that the diffraction results of solid columu,hollow column and single bullet ice particles randomly oriented in space are very close.  相似文献   

Observations Of The Turbulence Structure Within Two Stratocumulus-Topped, Marine Boundary Layers     

Pierre Durand  Thomas Bourcy 《Boundary-Layer Meteorology》2001,99(1):105-125

Two situations observed during the second Aerosol Characterization Experiment (ACE-2) are analysed from aircraft measurements in the broken stratocumulus (Sc)-topped marine boundary layer. The first one (26 June 1997), characterized by a non-polluted, oceanic air mass, presents a decoupling between the Sc layer (1400–1520 m) and the turbulent mixed layer, this latter extending from the surface up to 580 m. In contrast, the second case (9 July 1997), during which continental air had been advected over the experimental area, presents a well-coupled layer extending from the surface up to the top of the Sc layer(910 m). This coupling, uncommon in this area in the middle of the day, isrelated to the relative shallowness of the boundary layer. For both situations,it is shown that the turbulent fluxes can be computed with reasonably goodaccuracy (better than 10 %), taking into account both the random and thesystematic errors involved in the eddy-correlation technique. Estimationof random error is based on the computation of the integral scale of thecovariance, and systematic error is estimated from the parameterizationof Mann and Lenschow. The fluxes show that the buoyancy, as a sourceof turbulence, is due to latent heat flux rather than sensible heat flux,with values comparable to previous experiments in the Azores-Canariesbasin. In addition, we propose a method to analyse, for coupled situations,the relationship between the fractional cloudiness and the organization ofthe turbulent field below the clouds. This method is based on a conditionalsampling technique. It is shown that this organization cannot be deducedfrom the analysis of the velocity signal, which is dominated by turbulence.However, when the signals are conditionally sampled according to thepresence or absence of clouds, a weak cloud-related organization can beshown, and the cloud-related transports quantified; the values found areof the order of 10 % of the total transfers, i.e. the same order of magnitude asthe errors on the total flux computation. The method developed is thereforepromising, provided that the uncertainties can be reduced by analyzing a highamount of data.  相似文献   

海底取样器工作机理分析及选用原则——海底取样技术专题之二          下载免费PDF全文

鄢泰宁  昌志军  补家武 《探矿工程》2001,(3):19-22

分析了海底取样过程的“桩效应”问题，阐述了振动取样器贯入沉积物的原理，归纳了取样器的选用原则，并就完海底取样技术提出了建议。  相似文献   

Natural Gas Hydrate Stability in the East Coast Offshore-Canada   总被引：1，自引：0，他引：1  

J. A. Majorowicz  K. G. Osadetz 《Natural Resources Research》2003,12(2):93-104

The methane hydrate stability zone beneath the Canadian East Coast oceanic margin has developed to a depth of more than 600 meters beneath the deep water column in the area of the deep shelf and the slope. This zone is continuous spreading from the Labrador continental shelf in the north to the slope of the Nova Scotia shelf in the south. Gas hydrates within the methane hydrate stability zone are detected only in one situation, however, they are numerous in the deeper zone in which type II gas hydrates are present through the whole area at water depths as low as 100-200 m. Well-log indications of gas hydrate situated deeper than the base of the methane hydrate stability zone may be an indication of wetter, compositionally more complicated hydrates that probably are not of bacterial only origin. This could indicate a deep thermogenic source of gas in hydrates. The presence of hydrates in the upper 1000 m of sediments also can be considered as an indicator of deeper hydrocarbon sources.  相似文献   

西南海海槽地震资料处理及其似海底反射层特征   总被引：6，自引：2，他引：6       下载免费PDF全文

宋海斌  松林修  仓本真一 《地球物理学报》2001,44(6):799-804

对西南海海槽的NT2-2地震测线进行了重新处理,突出了天然气水合物似海底反射层(BSR)的特征.比较了近炮检距剖面、叠加剖面、偏移剖面、瞬时振幅剖面与瞬时相位剖面上BSR的显示特征.指出了BSR在炮道集与共中心点道集上的分布.虽然在近炮检距剖面上能分辨部分BSR,但通过叠加与偏移可以得到BSR较清晰的图像.BSR的高振幅特征在瞬时振幅剖面上最为明显,而在瞬时相位剖面上容易勾画BSR的横向展布.  相似文献