全文获取类型
收费全文 | 279篇 |
免费 | 7篇 |
国内免费 | 4篇 |
专业分类
测绘学 | 9篇 |
大气科学 | 12篇 |
地球物理 | 43篇 |
地质学 | 136篇 |
海洋学 | 7篇 |
天文学 | 71篇 |
综合类 | 1篇 |
自然地理 | 11篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 6篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 13篇 |
2016年 | 15篇 |
2015年 | 9篇 |
2014年 | 17篇 |
2013年 | 19篇 |
2012年 | 14篇 |
2011年 | 14篇 |
2010年 | 8篇 |
2009年 | 11篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 9篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 5篇 |
1970年 | 3篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1964年 | 2篇 |
1963年 | 2篇 |
1962年 | 2篇 |
1929年 | 1篇 |
排序方式: 共有290条查询结果,搜索用时 17 毫秒
221.
Niranjan D. Chatterjee 《Contributions to Mineralogy and Petrology》1974,43(1):25-28
Indexed powder X-ray data are given for synthetic 2 M-paragonite (Table 1); this set of data will supersede those published earlier (Chatterjee 1970). From refined cell dimensions of three synthetically prepared 2 M-paragonite, the molar volume is calculated as 3.1545±0.0012 cal/bar-gfw. Review of literature suggests that this is presently the best value for the molar volume of paragonite. 相似文献
222.
Prasanta K. Misra 《Boundary-Layer Meteorology》1977,11(1):117-120
The steady-state, homogeneous and barotropic equations of motion within the planetary boundary layer are solved with the assumption that the coefficient of eddy viscosity varies as K(Z) = K
O(1–Z/h)
p
, where h is the height of the bounday layer and p is a parameter which depends on atmospheric stability. The solutions compare favourably with observed velocity profiles based on the Wangara data. 相似文献
223.
A number of hot springs occur in the Parbati Valley in Himachal Pradesh in India. Temperatures range from 21 to 96°C, the boiling point of water at that altitude. Geological conditions, temperature variations and chemical composition of spring water in the Parbati Valley hydrogeological unit indicate that the deep thermal fluids are of meteoric origin. The maximum temperature acquired by water during its circulation is estimated to come close to 200°C. In order to assess the possibility of extracting geothermal energy, a seismic survey was arranged to locate the hypocentres of microearthquakes associated with the thermal source. A total of eight microearthquake units was set up at an interstation spacing of about 10 km and two months recording were obtained. During this period an average of 2–3 events per day was recorded with S—P interval less than 5 seconds. The data have been analysed with the help of Hypo 71, a Fortran IV computer program designed to determine the hypocentral parameters of earthquakes from seismic data. The results indicate faulting but there is no apparent spatial relationship to surface manifestations of geothermal energy. 相似文献
224.
225.
Petra Bruckmann-Benke Niranjan D. Chatterjee Anatoliy M. Aksyuk 《Contributions to Mineralogy and Petrology》1988,98(1):91-96
Three Al-Cr exchange isotherms between Zn(Al, Cr)2O4 spinel and (Al, Cr)2O3 corundum crystalline solutions have been studied experimentally at 900°, 1100°, and 1300° C, at a total pressure of 25 kbar. Employing data on the equation of state of corundum (Chatterjee et al. 1982), the experimental results were evaluated thermodynamically. It was found that the thermodynamic mixing properties of Zn(Al, Cr)2O4 spinels are best described in terms of a symmetric Margules equation. The T- and P- dependence of the Margules Parameter, W G Sp , and of ΔG* of the exchange reaction, 1/2 ZnAl2O4 + 1/2 Cr2O3 = 1/2 ZnCr2O4+1/2 A12O3, are found to be ΔG *=1493?2.869·T+0.0081·P and W G Sp (J/mol)=23456+0.0386·P, with T given in K and P in bar. 相似文献
226.
Assessment of groundwater resources in India is guided by National Water Policy (1987, 2002) which states that groundwater resources can be exploited only up to its recharge limit. The methodology for groundwater resources assessment in India is broadly based on Ground Water Resources Estimation Methodology, 1997 and it involves assessment of annual replenishable groundwater resources (recharge), annual groundwater draft (utilization) and the percentage of utilization with respect to recharge (stage of development). The assessment units (blocks/watersheds) are categorized based on stage of groundwater development (utilization) and the long term water level trend. The present methodology though useful in identification and prioritization of areas for groundwater management, falls short of addressing several critical issues like spatial and temporal variation of groundwater availability within the aquifer, accessibility of groundwater resources and quality of groundwater. This paper introduces a new categorisation scheme considering the above issues. The proposed scheme takes into account four criteria, viz. (i) stage of exploitation, (ii) extractability factor, (iii) temporal availability factor and (iv) quality factor. In comparison to the existing method used for categorisation, the proposed approach is more inclusive. The methodology is also equally suitable for both alluvial and hard rock terrain since it takes into consideration the variable characteristics of different types of aquifers and convergence of quantitative and qualitative assessment. The categorisation proposed here involves GIS based integration of different parameters/ themes. This allows better representation of spatial variability. The proposed methodology is demonstrated in this paper taking a case study from a hard rock terrain in central India. 相似文献
227.
Kripamoy Sarkar Ashok Kumar Singh Anurag Niyogi Prasanta Kumar Behera A. K. Verma T. N. Singh 《Journal of the Geological Society of India》2016,88(3):387-393
The present paper demonstrates the assessment of slope stability analysis between Rampur to Jhakri road section along National Highway (NH-22), Himachal Pradesh, India. The different types of slope failures have affected most part of slopes which causes considerable loss of life and property, inconveniences such as disruption of traffic along highways. The poorly designed rock slopes for road widening or construction purposes may weaken the stability of the slopes. A detail field investigation has been carried out to collect the representative rock samples for determination of physico-mechanical properties of rock and joint data for kinematic analysis. The rocks exposed in the area are highly jointed quartzite and quartz-mica schist of Rampur-Larji Group of Palaeoproterozoic age. The continuous slope mass rating (CSMR) technique has been applied for the assessment of slope stability analysis at five vulnerable locations and the results shows slopes are partially stable to unstable. Kinematic analysis mainly shows wedge type of failure along with few toppling and planar failures. The existing slope required immediate treatment to prevent the failure for its long term stability. 相似文献
228.
Integrated geophysical and geological studies for mineral prospecting in Betul-Chhindwara belt (BCB), Central India 总被引:1,自引:0,他引:1
Dewashish Kumar D. V. Subba Rao K. Sridhar M. Satyanarayanan Prasanta K. Patro 《Journal of the Geological Society of India》2016,87(4):383-396
Integrated study combining high resolution electrical resistivity tomography and time domain induced polarization was carried out in Betul-Chhindwara belt Madhya Pradesh, Central India in order to evaluate and delineate the polymetallic sulphide mineralization, its nature, type of deposit and depth. On interpretation of the models results clear cut anomalies revealed showing chargeability ~2 to 54 mV/V up to a maximum depth of 131m. This range of chargeability signify signature of metallic conductor. Nevertheless the basement rock is clearly mapped, showing substantial resistivity contrast. In addition detailed analysis of the integrated results from geology, geochemistry and Scanning Electron Microscope–Energy Dispersive X-ray Spectroscopy resulted from in situ rock samples shows good correlation with resistivity and IP results. This integrated study confirms the presence of conducting sulphide mineral ore body and the results and findings need test drilling at the geophysical anomalous site(s) to confirm the depth persistence and evaluate the metallic conductor. 相似文献
229.
S. N. Chatterjee 《Pure and Applied Geophysics》1971,90(1):53-60
Summary Propagation and the dispersion equation of love waves for a few generalised models of heterogeneous crust over a heterogeneous mantle have been investigated. Dispersion equations obtained by a few earlier authors have been shown to be the special cases of the above results. 相似文献
230.
D. Chatterjee 《Pure and Applied Geophysics》1970,78(1):37-41
Summary The paper deals with the investigation of disturbances in an infinite non-homogeneous isotropic elastic medium produced by a source operating on the inner surface of a cylindrical hole. 相似文献