A rock mass classification model for caving roofs     

A. K. Ghose  D. Dutta 《Geotechnical and Geological Engineering》1987,5(3):257-271

Summary Evaluation of the caving behaviour of longwall roof rocks has thus far been based on a pot-pourri of classification systems, which ignore basic caving criteria. The paper outlines a new classification model of roof strata namely cavability using fuzzy set methodology and linguistic variables to assign ratings for individual roof beds. A microcomputer program has been developed to evaluate the decision ratings for cavability and the model applied to ten longwall case-histories from Indian coalfields. The classification model has excellent potential for being used as a standard tool for the evaluation of caving behaviour of longwall roof rocks.  相似文献   

Unsteady curvilineal flow of an incompressible simple fluid between two rotating concentric spheres     

Jagannath Dutta  T. K. Chaudhury 《Pure and Applied Geophysics》1973,102(1):161-166

Summary Unsteady curvilineal flow of an incompressible simple fluid (based on Noll's theory) representing the flow between two rotating concentric spheres is considered. The outer sphere is assumed to undergo forced harmonic oscillations about a vertical axis through its centre, while the inner sphere is constrained by a torsionwire. It is found that exact solution in terms of Bessels functions exists under certain conditions on the shear stress function and the normal stress functions.  相似文献   

Propagation of Love Waves in a certain type of heterogeneous layer     

Subhas Dutta 《Pure and Applied Geophysics》1971,87(1):124-127

Summary Propagation of Love Waves in a layer in which the velocity first decreases with depth, reaches a miniumm at a certain depth and then increases as the depth further increases in studied in this paper.  相似文献   

Desertification in western Rajasthan (India): an assessment using remote sensing derived rain-use efficiency and residual trend methods     

Kundu  Arnab  Patel  N. R.  Saha  S. K.  Dutta  Dipanwita 《Natural Hazards》2017,86(1):297-313

Natural Hazards - Owing to its impact on global ecosystem, climate change and related effects is being perceived as a serious issue worldwide especially in the arid and semi-arid regions. Climatic...  相似文献   

Co-composting of cow dung,municipal solid waste,roadside pond sediment and tannery sludge: role of human hair     

T. Karak  F. R. Kutu  R. K. Paul  K. Bora  D. K. Das  P. Khare  K. Das  A. K. Dutta  R. K. Boruah 《International Journal of Environmental Science and Technology》2017,14(3):577-594

In general, farmers from developing countries often use several feeding mixtures based on materials available in their vicinity resulting in a final poor-quality compost product. Human hair as a composting feed could impact on the nutrient status in prepared compost. In this study, the effect of different amount of human hair to tannery sludge, roadside pond sediment, municipal solid waste and cow dung was investigated during 70-day composting cycle. Human hair addition increased N, P and K from 1.36 to 22.85, 53.06 to 189.80 and 4.13 to 39.26%, respectively, over control. Total metal and arsenic contaminations were significantly higher than in control but lower than the Indian permissible limit. Highest amount of human hair in composting feed indicated that the germination index for tea seed (Camellia sinensis L.) was less than 80% reflecting the possible remaining phytotoxic substances. Redundancy analysis revealed that there was a significance influence of the physico-chemical variables on bacterial community.  相似文献   

Effect of saturation on dynamic properties of compacted clay in a resonant column test     

Troyee Tanu Dutta  Maheshbabu Jallu 《Geomechanics and Geoengineering》2017,12(3):181-190

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