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41.
地下圆形衬砌隧道对沿线地震动的影响(II):数值结果 总被引:5,自引:3,他引:5
利用地下圆形衬砌隧道对入射平面P波和SV波散射级数解答,定量分析了入射波长、入射角度、隧道直径、衬砌刚度等因素对沿线地表位移放大作用的影响。计算结果表明,当入射频率较低时,地下隧道的存在对地表位移幅值影响不大;而当入射频率较高时,地表位移幅值可以达到无隧道情况的4.5倍以上;衬砌情况下地表位移幅值可以高出非衬砌情况的87.8%。建议在地铁的规划设计中考虑地下隧道的建设对隧道沿线设计地震动的影响。 相似文献
42.
"2002.5.13"黔南暴雨天气过程分析 总被引:2,自引:0,他引:2
从环流形势特征、T213数值预报产品和雷达回波等方面对2002年5月13日黔南州暴雨天气过程进行了分析总结,得出暴雨天气的发生与高空槽、低涡切变系统的活动以及高、中、低层数值预报产品的有利配合密切相关。丰富的水汽输送、高层辐散和低层辐合的抽气机效应是暴雨产生的必要条件。 相似文献
43.
Contradictory results are reported for the behaviour of quaternary ammonium compounds (QACs) in sewage treatment plants (STPs). QACs may sorb onto activated sludge. Only little information is available with respect to effects of QACs against bacteria in STPs. Only 5 to 15 % of bacteria present in sewage sludge can be detected by means of culture dependent microbiological methods. The shift of the bacterial populations due to effects of test compounds have not been studied up to now with culture independent methods. The microbial populations shift was studied in situ using culture independent chemotaxonomy profiling ubiquinones and polyamines. Additionally, toxic effects of QACs against bacteria present in the test vessels of the Zahn‐Wellens test (OECD 302 B) were assessed with a toxicity control in the test. The ubiquinone profiles representing changes in Gram‐negative populations mainly showed that the activated sludge was affected only in test vessels containing benzalkonium chloride. According to chemotaxonomy Acinetobacter or/and some members of Pseudomonas spp. have been selected by benzalkonium chloride after some adaptation period (8 to 12 days). 相似文献
44.
Padinare V. Unnikrishna Jeffrey J. McDonnell Carol Kendall 《Journal of Hydrology》2002,260(1-4):38-57
Isotopic variations in melting snow are poorly understood. We made weekly measurements at the Central Sierra Snow Laboratory, California, of snow temperature, density, water equivalent and liquid water volume to examine how physical changes within the snowpack govern meltwater δ18O. Snowpack samples were extracted at 0.1 m intervals from ground level to the top of the snowpack profile between December 1991 and April 1992. Approximately 800 mm of precipitation fell during the study period with δ18O values between −21.35 and −4.25‰. Corresponding snowpack δ18O ranged from −22.25 to −6.25‰. The coefficient of variation of δ18O in snowpack levels decreased from −0.37 to −0.07 from winter to spring, indicating isotopic snowpack homogenization. Meltwater δ18O ranged from −15.30 to −8.05‰, with variations of up to 2.95‰ observed within a single snowmelt episode, highlighting the need for frequent sampling. Early snowmelt originated in the lower snowpack with higher δ18O through ground heat flux and rainfall. After the snowpack became isothermal, infiltrating snowmelt displaced the higher δ18O liquid in the lower snowpack through a piston flow process. Fractionation analysis using a two-component mixing model on the isothermal snowpack indicated that δ18O in the initial and final half of major snowmelt was 1.30‰ lower and 1.45‰ higher, respectively, than the value from simple mixing. Mean snowpack δ18O on individual profiling days showed a steady increase from −15.15 to −12.05‰ due to removal of lower δ18O snowmelt and addition of higher δ18O rainfall. Results suggest that direct sampling of snowmelt and snow cores should be undertaken to quantify tracer input compositions adequately. The snowmelt sequence also suggests that regimes of early lower δ18O and later higher δ18O melt may be modeled and used in catchment tracing studies. 相似文献
45.
46.
企业地震预警系统应用研究 总被引:8,自引:1,他引:8
在充分调研国外地震预警系统现状的基础上,进行了地震预警系统的研究,研制了相应的数据分析软件。采用数字化观测技术、GIS技术等高新技术,在中国石油天然气股份有限公司大连分公司建立了地震预警试验系统,并将该地震预警系统与地震应急系统相连,为今后开展类似工作积累了经验。 相似文献
47.
Soil sediment samples of 10 layers with a spacing of 10 cm each were collected in different floodplain zones adjacent to Huolin
River in the Xianghai Nature Reserve, and contents of total N, total P and organic matters were analyzed. The results showed
that contents of total N, total P and organic matters were generally decreasing with the increase of distance from sample
locations to the river channel, and contents of the three items were generally higher in the upper soil layer than that in
the lower soil layer. The content variations displayed how flooding functions influenced nutrient matter content variations
in floodplain soils since the flood inundation frequencies of the sample locations varied. The correlation analysis displayed
that there were remarkable relativities between total N, total P and organic matters within definite spatial distance from
the Huolin River channel. 相似文献
48.
49.
云南富源胜境关金矿开发生产初期,运用堆浸理论,根据矿山工业场地实际和矿石的物理化学性质,及矿石中的有害杂质(组织)的含量,多次试验、调整技术参数(堆浸场地物理性质、矿石粒度、矿堆高度、矿堆渗透性、氰化物浓度、浸出液碱性、浸出温度、喷淋强度、吸附流速或流量等),完善浸出工艺,缩短浸出周期,提高浸出率,取得了良好的经济效益。 相似文献
50.
陈培善 《地震学报(英文版)》2003,16(1):124-125
Illustration
All the data in this catalog are chosen from the (Preliminary Seismological Report of Chinese Seismic Stations(
“Its abbreviation is "Monthly Report"). The catalog includes the events of M≥4.7 in and near China and M≥6 all over the world. The "Monthly Report" is monthly compiled by the Ninth Section of Institute of Geophysics, CSB. 相似文献