全文获取类型
收费全文 | 133篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
测绘学 | 11篇 |
大气科学 | 8篇 |
地球物理 | 16篇 |
地质学 | 78篇 |
天文学 | 22篇 |
综合类 | 2篇 |
自然地理 | 1篇 |
出版年
2022年 | 6篇 |
2021年 | 1篇 |
2020年 | 6篇 |
2019年 | 2篇 |
2018年 | 13篇 |
2017年 | 11篇 |
2016年 | 11篇 |
2015年 | 8篇 |
2014年 | 9篇 |
2013年 | 5篇 |
2012年 | 11篇 |
2011年 | 4篇 |
2010年 | 7篇 |
2009年 | 7篇 |
2008年 | 11篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
排序方式: 共有138条查询结果,搜索用时 78 毫秒
131.
For the delineation of water-bearing fractures in hard rock areas, a new hydro-chemical technique has been developed which
is based on electrical conductivity (EC) logs. The EC logs were carried out in experimental shallow bore wells (≈50 m) in
three different parts of India. A sharp variation in EC was observed near water-bearing fractures in hard rock areas. To access
applications of this technique, different locations in India were selected and experimental bore wells (≈50 m) were drilled.
These were:
Observations on EC logs were made at short intervals of 1.0 m from the water table (narrow spacing wherever required) until
reaching the bottom of the wells. EC showed remarkable changes in value, which was attributed to the presence of water-bearing
fractures in the hard rock areas. The results of this study are in good agreement with geophysical and geological findings.
In addition to identifying the water-bearing fractures, the EC logs also provide various other hydrological and hydrochemical
information, i.e., water table, total depth of the bore well, total dissolved solids (TDS), behavior of water–rock interaction,
water quality, information about the chemistry of aquifers, etc. 相似文献
(1) | Maheswaram (30 km South of Hyderabad): nine shallow bore wells in a watershed of 60 km2 in granitic aquifers, |
(2) | Wailpally (60 km East of Hyderabad): four shallow bore wells in a watershed of 50 km2 in granitic terrain. |
(3) | Sadras (60 km SSW of Chennai): four shallow bore wells in a watershed 12 km2 in a charnokite aquifers. |
132.
The gravitational field of a global monopole in the context of Einstein–Cartan theory is investigated. A comparison is made
with the corresponding results predicted by general relativity.
PACS Nos: 98.80cq; 04.20 jb; 04.50 相似文献
133.
The quantitative separation of As(III) from a water sample containing As(III) and As(V) in the presence of Fe and Mn in an ion exchange resin (AG1 X8) column for the speciation of arsenic is described. Individual and combined effects of Fe and Mn on the separation of As(III) from the solution have been studied separately. In absence of Fe and Mn, the ratio between the As(T) concentration in the eluent and the As(III) concentration in the original sample has been found to be 0.9717 under optimum process conditions. The presence of Fe(II) in the water sample increased the As(T) concentration in the eluent whereas Mn(II) decreased it. Combined effects of Fe and Mn on the percentage increment in the eluent arsenic concentration have been expressed by additive and interactive models. The interactive model has been developed by a statistical software with a 95 % confidence level. In most of the cases the error on the determination of the As(III) concentration had a minimum when using the interactive model. 相似文献
134.
In order to assess the groundwater potentiality and augmentation of water supply schemes, estimation of the safe yield, well loss, formation loss, horse power of pump, depth of pump installation and duration of the pumping are essential. These parameters are estimated either by means of in-situ test or laboratory test. But the applicability of result from the laboratory test has limitations while in-situ tests give real representation of individual well of aquifer. The most common in-situ test is pumping test performed on well, which involves measurement of the fall and rise of water level with respect to time. The changes in water level (drawdown/recovery) and its quality are caused due to pumping of water from the well. Such study was carried out in Salur Mandal, Vizainagaram, Andhra Pradesh, India. 相似文献
135.
136.
137.
Siddique Tariq Mondal M. E. A. Pradhan S. P. Salman M. Sohel M. 《Natural Hazards》2020,104(1):413-435
Natural Hazards - The roadway networks serve as arteries for the ongoing socio-economic activities within the Himalayan region. The perilous conditions of geologically active and fragile terrain... 相似文献
138.
Chakrabortty Rabin Pal Subodh Chandra Sahana Mehebub Mondal Ayan Dou Jie Pham Binh Thai Yunus Ali P. 《Natural Hazards》2020,104(2):1259-1294
Natural Hazards - Land degradation is very severe in the subtropical monsoon-dominated region due to the uncertainty of rainfall in the long term, and most of the rainfall occurs with high... 相似文献