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71.
Mohammad Imran Malik M. Sultan Bhat Shahnaz Ahmad Najar 《Journal of the Geological Society of India》2016,87(6):716-726
The valley of Kashmir is blessed with abundant water resources. However, high population growth and concentration of population at favorable locations have resulted in increased demand for water. The problem is further aggravated in Lidder catchment where unplanned tourism development has resulted in deterioration of water quality. Multi-Criteria Evaluation (MCE) approach is adopted using IRS P6 LISS III satellite data 2010, geological map published by Geological Survey of India, toposheets prepared by Survey of India, 1961 and field observation. Seven thematic layers (slope, lineament density, drainage density, soil, geology, geomorphology and land use land cover) are generated in GIS environment and weighted according to their relative relevance to groundwater occurrence. Knowledge-based weights and ranks are normalized, and a weighted linear combination technique is adopted to determine the groundwater potential (GWP). The catchment is divided into five zones of very high, high, medium, low and very low GWP. The results show that 50.22% of the total catchment area, which is uninhabited, has very low GWP. However, the densely populated southern part of the catchment has moderate to very high GWP. The study demonstrates that MCE using remote sensing and GIS technology could be efficiently employed as a very useful tool for the assessment and management of groundwater resources especially in regions where data is poor. 相似文献
72.
Naveen Hakhoo Bindra Thusu Ghulam M. Bhat Jonathan Craig Juergen Thurow Mateen Hafiz 《Journal of the Geological Society of India》2016,88(3):267-272
The Proterozoic Sirban Limestone Formation (SLFm) exposed in a number of inliers in Jammu (India), NW Himalaya is a potential target for hydrocarbon and ore mineral exploration. The structural complexity not only makes correlation of the SLFm with coeval hydrocarbon producing Proterozoic formations in the neighbouring Salt Range in Pakistan and elsewhere in the world extremely difficult, but also limits the understanding of the genesis of sedimentary hosted mineral deposits. The base of the SLFm inliers is not exposed anywhere in the region and the age of this sequence has been suggested to range from Palaeoproterozoic to Neoproterozoic. 相似文献
73.
Mallick Javed Islam Abu Reza Md. Towfiqul Ghose Bonosri Islam H. M. Touhidul Rana Yousuf Hu Zhenghua Bhat Shakeel Ahmed Pal Subodh Chandra Ismail Zulhilmi Bin 《Theoretical and Applied Climatology》2022,147(1-2):307-324
Theoretical and Applied Climatology - The rise in the frequency and magnitude of extreme temperature phenomena across the globe has led to the recurrent incidence of global climate hazards, which... 相似文献
74.
Shiv Jyoti Pandey G. M. Bhat Shveta Puri Neha Raina Yudhbir Singh S. K. Pandita Mithila Verma B. K. Bansal Anup Sutar 《Journal of Seismology》2017,21(3):525-538
Two moderate earthquakes of Mw 5.7 on the first of May and Mw 5.2 on the second of August occurred in the Kishtwar region in the year 2013. Our broadband seismic observatories located in the region recorded these events and the aftershocks. We analyzed these data to understand the seismotectonics of this region. Most of the events were located between 33.03° to 33.29° N latitude and 75.40° to 76.07° E longitude. Focal depths of these shallow earthquakes range from 7 to 12 km and are confined between Panjal Thrust (PT) and Kishtwar Window (KW). Spectral analysis of these events reveals that stress drop, source radius, corner frequency, and moment magnitude varied between 3.3 and 70.1 bars, 0.121 and 3.55 km, 0.397 and 6.06 Hz, and Mw 2.2 and Mw 5.7, respectively. The low stress drop of small-magnitude earthquakes reveals the brittle nature of the upper crust which is coincident with the field observations. The variation of stress drop with magnitude shows positive correlation whereas no such relation was observed between stress drop and depth of focus. The b value calculated (0.83) for the area reveals high stress accumulation within the incompetent rock zones in the area. 相似文献
75.
M. Venkataramana K. Sengupta G. S. Bhat S. Ameenulla J. V. S. Raju 《Journal of Earth System Science》2000,109(2):239-247
This paper describes measurement of air-sea parameters and estimation of sensible and latent heat fluxes by the “Inertial-Dissipation”
technique over south Bay of Bengal. The data were collected on ORV Sagar Kanya during BOBMEX-Pilot cruise during the period
23rd October 1998 to 12th November 1998 over south Bay of Bengal. The fluxes are estimated using the data collected through
fast response sensors namely Gill anemometer, Sonic anemometer and IR Hygrometer. In this paper the analyses carried out for
two days, one relatively cloud free day on November 3rd and the other cloudy with rain on November 1st, are presented. Sea
surface and air temperatures are higher on November 3rd than on November 1st. Sensible heat flux for both the days does not
show any significant variation over the period of estimation, whereas latent heat flux is more for November 3rd than November
1st. An attempt is made to explain the variation of latent heat flux with a parameter called thermal stability on the vapor
transfer from the water surface, which depends on wind speed and air to sea surface temperature difference. 相似文献
76.
The design of aerospace structures necessitates the study of their behaviour in intense acoustic environments. This is more so in recent times due to an increase in power of the vehicles. The present paper deals with an investigation of the response of structures such as flat, stiffened plates to such environments. A peaked type of power spectral density of excitation is assumed, which is more realistic and representative of actual random acoustic excitations than the conventionally assumed white noise type excitations, either ideal or band-limited. The space correlation of the excitation field is assumed to be unity over the plate surface. Generalized harmonic analysis is used to obtain responses such as auto-correlation functions and mean square values of both accelerations and stresses. To obtain the response quantities of stiffened plates the approximate method of analysis suggested by Lin12 is used. 相似文献
77.
A. K. Tickoo R. Koul S. K. Kaul I. K. Kaul C. L. Bhat N. G. Bhatt M. K. Kothari H. C. Goyal N. K. Agarwal S. R. Kaul 《Experimental Astronomy》1999,9(2):81-101
A PC-based drive-control system has been developed for the altitude-azimuth mounted TACTIC -ray telescope to control the speed and direction of motion of its 2-axes. Details of various hardware components chosen for the telescope, including hybrid-stepper motor, 16-bit absolute encoder and CAMAC-based programmable stepper motor controller, are discussed in this paper. The telescope-control strategy, based on the position-loop with a proportional type control for the source-seek mode and the on/off type control for the tracking mode, is explained in detail. Some important performance features of the telescope, including its blind-spot size, drive-system backlash and encoder-error compensation, are also presented. The drive system has been extensively field-tested and has been operating satisfactorily during observation campaigns carried out since March 1997 with the TACTIC Imaging Element. A tracking accuracy of ±3 arc-minutes has been achieved. A test report of its performance, with regard to its tracking accuracy on the basis of successful detection of TeV -rays from the active galaxy Markarian 501 in April–May 1997, is also presented. 相似文献
78.
The measurement of surface energy balance over a land surface in an open area in Bangalore is reported. Measurements of all
variables needed to calculate the surface energy balance on time scales longer than a week are made. Components of radiative
fluxes are measured while sensible and latent heat fluxes are based on the bulk method using measurements made at two levels
on a micrometeorological tower of 10m height. The bulk flux formulation is verified by comparing its fluxes with direct fluxes
using sonic anemometer data sampled at 10Hz. Soil temperature is measured at 4 depths. Data have been continuously collected
for over 6 months covering pre-monsoon and monsoon periods during the year 2006. The study first addresses the issue of getting
the fluxes accurately. It is shown that water vapour measurements are the most crucial. A bias of 0.25% in relative humidity,
which is well above the normal accuracy assumed by the manufacturers but achievable in the field using a combination of laboratory
calibration and field intercomparisons, results in about 20W m−2 change in the latent heat flux on the seasonal time scale. When seen on the seasonal time scale, the net longwave radiation
is the largest energy loss term at the experimental site. The seasonal variation in the energy sink term is small compared
to that in the energy source term. 相似文献
79.
Vayujeet Gokhale R. C. Rannot A. K. Tickoo S. Bhattacharyya C. L. Bhat 《Experimental Astronomy》2001,12(3):195-209
Based on this exploratory investigation involving CORSIKA simulation code generated Cherenkov photons and a linearly polarized,
hypothetical photon beam, we make a case here for exploiting polarization properties of atmospheric Cherenkov events for providing
an independent method for locating air-shower cores by a TACTIC-like array of atmospheric Cherenkov telescopes. Preliminary
results based on simulations indicate that for a 3 TeV γ-ray having ∼30% degree of polarization for its associated Cherenkov
light at a core distance of ∼100 m, core location can be found with an error of ∼27 m.
Deceased
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
80.