Influence of natural blocks on rock fragmentation by blasting     

G. R. Adhikari  R. N. Gupta 《Geotechnical and Geological Engineering》1989,7(4):333-340

  相似文献   

DISCUSSION OF "Computer Note on a Program to Analyze Aquifer Test Data and Check for Validity with the Jacob Method," by Malcolm S. Field     

V. S. Singh  C. P. Gupta 《Ground water》1994,32(1):145-145

  相似文献   

PHYSICAL GEOGRAPHY IN SOUTHEAST ASIA: PAST THEMES, CURRENT STATUS AND FUTURE TRENDS     

Avijit Gupta  M.A.  Ph.D.  P.P. Wong  M.A.  Ph.D. 《Singapore journal of tropical geography》1994,14(2):252-264

Our knowledge regarding the physical geography of Southeast Asia is incomplete to a surprising extent. This paper reviews the past research, describes the ongoing work, and attempts to identify the future trends. Coverage of such a large area, even for the last 25 years, requires study of publications in several languages and coping with literature which is not easily available. Therefore certain topics. which are prominent in current research and likely to remain so in the future were chosen and reviewed in detail. Such topics include studies related to active plate margin features; the Pleistocene in Southeast Asia; erosion and sedimentation rates; rainforest; river systems; karst in Southeast Asia; coastal geomorphology; and the urban environment. Environmental studies are rapidly gaining importance chiefly because of (a) the destruction of the natural vegetation and the associated loss of biodiversity and (b) the growing problems due to accelerated erosion and sedimentation This trend is likely to continue with accelerated destruction of forests, development of coastal areas, and urbanization of the landscape The direction of research in physical geography of Southeast Asia has been determined by a combination of individual research interest, governmental priorities, and international expectations  相似文献   

FORTY YEARS OF PHYSICAL GEOGRAPHY IN THE JOURNAL     

P.P. Wong  M.A.  Ph.D.  Avijit Gupta  M.A.  Ph.D. 《Singapore journal of tropical geography》1994,14(2):295-309

Up to June 1993, 207 articles on physical geography have been published in the Malayan Journal of Tropical Geography (MJTG) (1953–57), Journal of Tropical Geography (JTG) (1958–79) and the Singapore Journal of Tropical Geography (SJTG) (1980–93). These articles are examined initially in terms of their sub-fields (Biogeography, Climatology, Geomorphology, Hydrology, and Soils), area of focus (the tropics, Africa, America, East Asia, South Asia, Southeast Asia excluding Malaysia and Singapore, Malaysia, Singapore, and Southwest Pacific) and the area of origin of the authors. The more significant papers in the sub-fields are indicated. Various factors influencing the contributions to the Journal and some insights on the contributions of local staff (Singapore and Malaysia) are also given. The significance of the Journal as an avenue for local and foreign authors and for papers on physical geography in the tropics is briefly evaluated.  相似文献   

Marine regression along parts of the Indian Coast during the Quaternary — A study using satellite images     

AK Gupta 《Journal of the Indian Society of Remote Sensing》1989,17(4):45-53

Features of marine regression along the Indian Coast during the Quaternary have been studied using the Landsat Imagery for the possible causes and mechanisms of their formation. The occurrence of these features, specially cheniers, is very prominent along the Krishna — Godavari coast. Variations in the inland distances of the cheniers at different locations along the coast indicate differential regressions of the coast at different places. Progradation of the coast and local uplift are identified as the main factors for the same. The topography of the shelf before the regression has played an important role in the development of the regression surfaces of varying widths and the spatial arrangement of the regression features. Morphostructural factors have hindered the formation of deltas along the western coast and also the formation of regression features. Some of the gently sloping coasts without the regression features are the active zones of sediment erosion. The study points to the possibility that some of the coasts/deltas are tectonically active zones. The Krishna Godavari delta is undergoing uplift and the coasts/deltas of the Sundarbans, Mahanadi, Kerala and Saurasthtra are undergoing down-warping. This fact needs to be confirmed using data form deep drillings, geophysical tests and other sources. The confirmation of these phenomena will have a significant effect on the depth of sediment deposition, their maturity and finally on the formation, occurrence and migration of hydrocarbons.  相似文献   

Evolution of Regional Hydrogeologic Setup of a Hard Rock Aquifer Through R-C Analog Model     

C. P. Gupta  M. Thangarajan  V.V.S. Gurunadha Rao 《Ground water》1985,23(3):331-335

  相似文献   

Seismicity in the vicinity of the India-Burma border: Evidence for a sinking lithosphere     

Harsh K. Gupta  S. C. Bhatia 《Journal of Geodynamics》1986,5(3-4)

The vicinity of the India-Burma border region is among a few intracontinental regions in the world where intermediate-focus earthquakes occur. The recent installation of new seismic stations has improved the detection and location capabilities for earthquakes in this region. Three seismic stations belonging to this new array are located over the zone of intermediate-focus earthquakes. Analysis of recently acquired seismic data reveals a well-defined near-vertical zone of earthquake foci extending to 200 km beneath the Arakan-Yoma fold belt. On the basis of seismic, gravity and other geological data, it is suggested that this zone of earthquakes is associated with remnants of the already subducted, but not totally assimilated, Tethys oceanic lithosphere below the Burmese plate.  相似文献   

Discussion on a paper by W.-H. Wu and H. A. Smith     

V. K. Gupta  M. D. Trifunac 《地震工程与结构动力学》1995,24(11):1541-1542

  相似文献   

Acute Toxicity of Some Industrial Effluents in Relation to the Fish Size of Cyprinus carpio (HAM.) and Channa punctatus (BLOCH)     

S. Gupta 《洁净——土壤、空气、水》1987,15(2):185-192

The fish Cyprinus carpio (HAM.) and Channa punctatus (BL.) of the size ranging between 6.0 ± 1.2 cm and 28.0 ± 1.6 cm were exposed to different concentrations of industrial effluents from M/s Punjab Tannery Ltd. (Jalandhar), M/s Spinning Mill Ltd. (Hoshiarpur) and M/s Food Specialist Ltd. (Moga) for evaluating the influence of fish size on the acute toxicity of these effluents. Results indicate that the relative toxicity of the effluents decreased with the increase in fish size from 6.0 ± 1.2 cm to 20.6 ± 1.5 cm. However, for specimens of the size of 28.0 ± 1.6 cm and more, the toxicity of the effluents increased with an increase in fish size. On the basis of the relative toxicity to fish, effluent from Punjab Tannery was found highly toxic and from Food Specialist Industry, the least toxic.  相似文献   

Comparative Toxicity of Certain Non-Insecticidal Chemicals to Mesocyclops leuckarti,the Carrier Host of Dracunculosis     

S. Mehta  A. N. Gupta  R. C. Srivastava 《洁净——土壤、空气、水》1982,10(4):361-365

The relative toxicities of seven non insecticidal chemicals to Mesocyclops leuckarti were tested. The relative toxicity of each chemical is given as under: Chlorine water > Potassium permanganate > Cetavlon > Quicklime > Common alum > Savlon > Sodium bicarbonate.  相似文献