共查询到20条相似文献，搜索用时 31 毫秒
1.
Current knowledge on groundwater microbial pathogens and their control 总被引：12，自引：2，他引：10
Received, January 1999/Revised, July 1999, August 1999/Accepted, October 1999 相似文献
2.
E. L. Madsen 《Hydrogeology Journal》2000,8(1):112-125
Received, March 1999/Revised, May 1999/Accepted, June 1999 相似文献
3.
Microbial populations in contaminant plumes 总被引：4，自引：1，他引：3
Received, May 1999/Revised, October 1999/Accepted, October 1999 相似文献
4.
M. Friberg A. Larionov G. A. Petrov D. G. Gee 《International Journal of Earth Sciences》2000,89(1):21-39
Received: 7 May 1999 / Accepted: 2 November 1999 相似文献
5.
Received: 23 March 1999 / Accepted: 25 August 1999 相似文献
6.
Received: 24 May 1999 · Accepted: 19 July 1999 相似文献
7.
Received: 3 May 1999 · Accepted: 13 July 1999 相似文献
8.
Received: 19 April 1999 · Accepted: 19 July 1999 相似文献
9.
Received: 10 May 1999 / Accepted: 16 October 1999 相似文献
10.
R. Scherreiks 《International Journal of Earth Sciences》2000,89(1):90-107
Received: 25 June 1999 / Accepted: 30 November 1999 相似文献
11.
Received: 15 June 1999 · Accepted: 30 August 1999 相似文献
12.
Francis H. Chapelle 《Hydrogeology Journal》2000,8(1):41-46
2 (methanogenesis). In aquifers contaminated by anthropogenic contaminants, an excess of available organic carbon often exists,
and microbial metabolism is limited by the availability of electron acceptors. In addition to changes in groundwater chemistry,
the solid matrix of the aquifer is affected by microbial processes. The production of carbon dioxide and organic acids can
lead to increased mineral solubility, which can lead to the development of secondary porosity and permeability. Conversely,
microbial production of carbonate, ferrous iron, and sulfide can result in the precipitation of secondary calcite or pyrite
cements that reduce primary porosity and permeability in groundwater systems.
Received, January 1999/Revised, July 1999, August 1999/Accepted, October 1999 相似文献
13.
Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface 总被引：5，自引：0，他引：5
Geobacter become dominant members of the microbial community when Fe(III)-reducing conditions develop as the result of organic contamination,
or when Fe(III) reduction is artificially stimulated. These results suggest that further understanding of the ecophysiology
of Geobacter species would aid in better prediction of the natural attenuation of organic contaminants under anaerobic conditions and in
the design of strategies for the bioremediation of subsurface metal contamination.
Received, May 1999/Revised, October 1999/Accepted, October 1999 相似文献
14.
简要评述了１９９９年的世界矿业形势。１９９９年,世界经济在渡过了漫漫长夜之后见到了一线光明。但１９９９年的世界矿业仍然有喜亦有优：镍、钢、锌、铝、锡、铂族金属矿业得到了恢复和发展,金刚石再现辉煌,而金、铅矿业仍然低迷。矿产勘查工作继续处于不景气状态,而且每况愈下,许多地质学家靠失业救济金度日。虽然如此,矿产勘查界仍有不少重大发现。 相似文献
15.
During the field cruises of the Indian Ocean Experiment (INDOEX) extensive measurements on the atmospheric chemical and aerosol composition are undertaken to study the long-range transport of air pollution from south and southeast Asia towards the Indian Ocean during the dry monsoon season in 1998 and 1999. The present paper discusses the temporal and spatial variations in aerosols and aerosol forcing during the winter monsoon season (January-March) for INDOEX first field phase (FFP) in 1998 and INDOEX intensive field phase (IFP) in 1999. An interactive chemistry/aerosol model (LMDZ.3.3) is used to investigate the variation in the spatial distribution of tropospheric sulphate aerosols during 1998 and 1999. The model results depict major enhancement in the sulphate aerosol concentrations, radiative forcing (RF) and optical depth over the Indian subcontinent and adjoining marine areas between INDOEX-FFP and IFP. A significant increase in transport of sulphate aerosols from the continents to the Indian Ocean region has also been simulated during the winter monsoon in 1999. The mean RF over INDOEX-FFP in 1998 is found to be ?1.2 Wm–2 while it increased to ?1.85 Wm–2 during INDOEX-IFP in 1999. Model results reveal a mean sulphate aerosol optical depth (AOD) of 0.08 and 0.14 over Indian subcontinent during 1998 and 1999, respectively. The model results suggest that elevated AOD downwind of source regions in India can significantly affect the regional air quality and adjoining marine environments. 相似文献
16.
S. R. Kalsi 《Journal of Earth System Science》2003,112(2):239-253
We document the flow features, which are associated with the important synoptic systems that affected the Bay of Bengal (BoB)
and its neighbourhood and controlled the convective activity there during BOBMEX. The monsoon during July and August, 1999
was subdued. It was slightly more active in the initial phase of BOBMEX that commenced on 15th July 1999 and continued up
to first week of August 1999 but weakened during the second half of August. The convection was accordingly affected, reducing
the rainfall over India. There were several active and weak spells of convection over the Bay of Bengal that manifested in
five low pressure systems, of which two became depressions. 相似文献
17.
Effects of horizontal strain in estimating specific storage and compaction in confined and leaky aquifer systems 总被引：6，自引：1，他引：5
T. J. Burbey 《Hydrogeology Journal》1999,7(6):521-532
Mathematical and numerical distinctions are made between developments of governing equations involving groundwater flow and
granular displacement where (1) only vertical strain and no change in total normal load are assumed, and (2) such limitations
are eliminated. The former is referred to here as the Jacob-Terzaghi method; the latter is referred to as the Biot method.
Numerical comparisons of drawdown, compaction, and strain are made for hypothetical confined and leaky aquifer systems for
one- and three-dimensional strain problems. Simulation results indicate that incorporation of horizontal strain results in
reduced drawdowns. Vertical compaction for a specified stress distribution is greatly reduced when horizontal strain is invoked.
The distribution of strain components indicates that approximately two-thirds of the total volume strain originates from horizontal
compaction in pumped aquifers. Incorporation of horizontal strain also affects the distribution of flux through the overlying
confining layer as a function of distance from the pumping well and may ultimately affect the interpretation of aquifer-test
data.
Received, January 1999 / Revised, May 1999, August 1999 / Accepted, August 1999 相似文献
18.
Review of paleoseismological and active fault studies in Taiwan in the light of the Chichi earthquake of September 21, 1999 总被引：1，自引：0，他引：1
This paper reviews the research on active and earthquake faults in Taiwan conducted prior and after the 1999 Chichi earthquake. The Chichi earthquake plays as a turning point of the relevant studies, since the 1999 coseismic surface rupture exactly follows preexisting fault scarps, created in turn by previous seismic events along the Chelungpu Fault. This fact indicates that the precise mapping on the other active faults is fundamental to predict the location of surface rupture caused by large future earthquakes. Since 1999, many trenching studies have been carried out along the Chichi earthquake fault. A few of them demonstrates that the penultimate event is as young as probably only 200–430 years old; however, some others show a rather old age of several hundreds years or even older for the last faulting event before 1999. More trenching studies are necessary for such a long fault in order to understand the possible segmentation features and the correlation of the paleoseismic events identified along the entire fault length. In addition, we further discuss the offshore faulting associated with seismic event along the eastern coast of Taiwan, where the multiple Holocene terraces are well known. 相似文献
19.
20.
Geological causes and geomorphological precursors of the Tsaoling landslide triggered by the 1999 Chi-Chi earthquake, Taiwan 总被引：5，自引：0，他引：5
Masahiro Chigira Wen-Neng Wang Takahiko Furuya Toshitaka Kamai 《Engineering Geology》2003,68(3-4):259-273
The Tsaoling landslide, one of the largest landslide areas in Taiwan, has been affected by catastrophic events triggered by rain or earthquakes six times since 1862. These landslides, including that caused by the 1999 earthquake, have essentially not been reactivated old slides, but were sequential new ones that developed upslope, retrogressively. The landslide area is underlain by Pliocene sandstone and shale to form a dip slope with a bedding plane, dipping uniformly at 14°. The slip surface of the 1999 landslide was smooth and planar, parallel to the bedding plane with a slightly stepped profile; it formed within thinly alternated beds of fine sandstone and shale with ripple lamination or in a shale bed. The shale is weathered by slaking and probably by sulfuric acid, which is inferred to be one of the major causes of the intermittent retrogressive development of the landslides. The weathering was likely accelerated by the removal of overlying beds during earlier landslides in 1941 and 1942. The top margin of the 1999 landslide, in plan view, coincided with a V-shaped scarplet, which can be clearly recognized on aerial photographs taken before the landslide. This geomorphological feature indicates that this landslide had already moved slightly before its 1999 occurrence, providing precursory evidences. 相似文献