IMF BY dependence of the extent of substorm westward electrojet     

T. Arun  Ajay Dhar  K. Emperumal  B. M. Pathan 《Journal of Earth System Science》2005,114(2):177-184

In this paper the duskward extension of the westward auroral electrojet is investigated for substorm intervals on the basis of magnetograms recorded at the Indian Antarctic station, Maitri. The database comprises three years from 1998–2000. Based on an initial study of the magnetograms, an arbitrary local time of 2030 MLT is fixed to define the early manifestation of the substorm westward electrojet. Using this criterion 12 substorms are identified and the possible causes examined. Many of these events are observed to be associated with a moderate to intense ring current. The hourly average of the GSM B_Y-component of the interplanetary magnetic field (IMF) for the hour preceding the substorm onset at Maitri is negative for most of the events. It is suggested that the azimuthal shift of the auroral electrojets in the southern hemisphere resulting from a negative B_Y-component of the IMF influences the extent of the substorm westward electrojet. This finding implies that the IMF may have a role in controlling the longitudinal extent of substorm occurrence.  相似文献   

Delineation of hydraulic connectivity across a dolerite dyke through hydrogeological, geophysical and tracer studies—a case study     

S. Sankaran  R. Rangarajan  R. L. Dhar 《Environmental Geology》2005,48(4-5):411-419

A linear WNW–ESE trending dolerite dyke, having a width of 30–40 m and length of 3–4 km, exists in the catchment area of Himayatsagar reservoir in Ranga Reddy district of Andhra Pradesh state, India. A company has planned to set up an oil-based industrial unit a few kilometers away in the upstream side of the dyke. Hydrogeological, geophysical and tracer studies were carried out for establishing hydraulic connectivity across the dyke, which would in turn reflect on the possibility of contamination of the groundwater regime in the downstream side of the dyke due to discharge of effluents from the industry. The result of multiparameter investigations carried out in the area reveal that hydraulic connectivity exists across the dyke body.  相似文献   

A new approach to the determination of methane content of coal seams     

Bangsi Dhar Banerjee 《Geotechnical and Geological Engineering》1987,5(4):369-376

Summary An approach to the determination of methane content of coal seams is proposed. The method utilizes the transformed Airey's empirical equation on desorption of methane from coals. The methane content values estimated by this method correspond well with actual values from laboratory experiments. In the case of Indian coals, the applicability of the relationship for the calculation of the gas lost from coal lumps during long periods of time loss appears to be limited due to poor agreement with the experimental values.  相似文献   

Effects of disturbance intensities on vegetation patterns in oak forests of Kumaun, west Himalaya   总被引：1，自引：1，他引：0  

Ranbeer S.RAWAL  Sanjay GAIROLA  Uppeandra DHAR 《山地科学学报》2012,9(2):157-165

In order to realize the significance of oak forests for ecology and economy of the Himalayan region,the present study attempts to objectively characterize disturbance intensities and their impacts on compositional features of identified Oak forests, i.e.Banj-oak(Quercus leucotrichophora A.Camus), Tilonj-oak(Q.floribunda Lindley)and Kharsu-oak(Q. semecarpifolia J.E.Smith)in west Himalaya. Amongst studied forests,Q.leucotrichophora and Q. semecarpifolia forests exhibited high sensitivity towards disturbance intensities.In both forests, increasing level of disturbance significantly lowered tree density,dominance and natural recruitment (seedling and sapling density).Q.floribunda forests, however,appeared relatively more resilient to anthropogenic disturbances.Amongst studied oak forests,Q.semecarpifolia forests with overall poor natural regeneration are in a most critically endangered demographic state.However,a slightly improved regeneration(i.e.,seedling density)in moderately disturbed plots is indicative that such plots may be utilized most suitably for in situ revival of these forests.Effect of disturbance intensities on tree population is an important subject for forest ecology and management and the present study highlights a need for adopting different management strategies across disturbance intensities in diverse oak forests of west Himalaya.  相似文献   

Homotopy Perturbation Method‐Based Analytical Solution for Tide‐Induced Groundwater Fluctuations          下载免费PDF全文

Selva Balaji Munusamy  Anirban Dhar 《Ground water》2016,54(3):440-447

The groundwater variations in unconfined aquifers are governed by the nonlinear Boussinesq's equation. Analytical solution for groundwater fluctuations in coastal aquifers under tidal forcing can be solved using perturbation methods. However, the perturbation parameters should be properly selected and predefined for traditional perturbation methods. In this study, a new dimensional, higher‐order analytical solution for groundwater fluctuations is proposed by using the homotopy perturbation method with a virtual perturbation parameter. Parameter‐expansion method is used to remove the secular terms generated during the solution process. The solution does not require any predefined perturbation parameter and valid for higher values of amplitude parameter A/D, where A is the amplitude of the tide and D is the aquifer thickness.  相似文献   

Co-metabolic decolorization of a textile reactive dye by <Emphasis Type="Italic">Aspergillus fumigatus</Emphasis>     

Md. Ekramul Karim  K. Dhar  Md. Towhid Hossain 《International Journal of Environmental Science and Technology》2017,14(1):177-186

In the present study, a widely used reactive dye, Color Index (C.I.) Reactive Blue 268 was utilized for mycoremediation by Aspergillus fumigatus isolated from textile effluent. Complete decolorization of the test dye (0.1 g L^?1) was recorded within 6 days of static incubation at 27 °C in Czapek Dox broth (CDB). However, the isolate was unable to utilize the dye as a sole source of energy in Czapek Dox agar and CDB in absence of sucrose and obligate requirement of a labile carbon source, i.e., sucrose needed for induction of decolorization. Biosorption seems to play the pivotal role in decolorization as evident by coloring of the fungal biomass as that of dye color. The optimal conditions for the highest decolorization were found at 30 °C and pH 6.0 with 6-day-old inoculums supplemented with sucrose (10 g L^?1) and ammonium chloride (2 g L^?1) as a carbon and nitrogen source, respectively. The response of the isolate to increasing dye concentrations was found to be growth inhibitory. Surprisingly, about 65 % of dye decolorization was recorded with heat-inactivated biomass powder within 6 days of static incubation supporting the fact of fungal biosorption. Results of this study have established the candidature of the isolate for biotechnological removal of dyes from disreputable dying effluents.  相似文献   

Future Scenarios of Environmental Vulnerability Mapping Using Grey Analytic Hierarchy Process     

Sahoo  Satiprasad  Dhar  Anirban  Debsarkar  Anupam  Kar  Amlanjyoti 《Natural Resources Research》2019,28(4):1461-1483

Any sustainable resource utilization plan requires evaluation of the present and future environmental impact. The present research focuses on future scenario generation of environmental vulnerability zones based on grey analytic hierarchy process (grey-AHP). Grey-AHP combines the advantages of grey clustering method and the classical analytic hierarchy process (AHP). Environmental vulnerability index (EVI) considers twenty-five natural, environmental and anthropogenic parameters, e.g. soil, geology, aspect, elevation, slope, rainfall, maximum and minimum temperature, normalized difference vegetation index, drainage density, groundwater recharge, groundwater level, groundwater potential, water yield, evapotranspiration, land use/land cover, soil moisture, sediment yield, water stress, water quality, storage capacity, land suitability, population density, road density and normalized difference built-up index. Nine futuristic parameters were used for EVI calculation from the Dynamic Conversion of Land-Use and its Effects, Model for Interdisciplinary Research on Climate 5 and Soil and Water Assessment Tool. The resulting maps were classified into three classes: “high”, “moderate” and “low”. The result shows that the upstream portion of the river basin comes under the high vulnerability zone for the years 2010 and 2030, 2050. The effectiveness of zonation approach was between “better” and “common” classes. Sensitivity analysis was performed for EVI. Field-based soil moisture point data were utilized for validation purpose. The resulting maps provide a guideline for planning of detailed hydrogeological studies.

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Investigations related to scientific deep drilling to study reservoir-triggered earthquakes at Koyna,India   总被引：1，自引：0，他引：1  

Harsh Gupta  N. Purnachandra Rao  Sukanta Roy  Kusumita Arora  V. M. Tiwari  Prasanta K. Patro  H. V. S. Satyanarayana  D. Shashidhar  K. Mallika  Vyasulu V. Akkiraju  Deepjyoti Goswami  Digant Vyas  G. Ravi  K. N. S. S. S. Srinivas  M. Srihari  S. Mishra  C. P. Dubey  D. Ch. V. Raju  Ujjal Borah  K. Chinna Reddy  Narendra Babu  Sunil Rohilla  Upasana Dhar  Mrinal Sen  Y. J. Bhaskar Rao  B. K. Bansal  Shailesh Nayak 《International Journal of Earth Sciences》2015,104(6):1511-1522

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Deep resistivity sounding studies for probing deep fresh aquifers in the coastal area of Orissa, India     

S. B. Singh  B. Veeraiah  R. L. Dhar  B. A. Prakash  M. Tulasi Rani 《Hydrogeology Journal》2011,19(2):355-366

Exploration and exploitation of groundwater in sedimentary areas are reasonably simple. However, the problem of salinity in coastal areas makes the job very difficult, especially when the freshwater aquifers are not extensive and are entrapped between saline aquifers. States along the eastern coast of India, particularly Orissa with respect to the Mahanadi basin, have acute problems with groundwater salinity. It has been possible to locate horizons of fresh groundwater entrapped between deep saline aquifers in the southwestern part of Mahanadi delta, with the help of deep resistivity soundings along the Delang-Puri profile. This finding has been validated through boreholes and checked with electrical logs of this region. Three freshwater aquifers have been detected: one at shallow depth between 20 and 60?m, the second in the depth range of 90??60?m, and the third in the fractured/weathered basement. The second freshwater aquifer has the most potential; it has a thickness range of 20??0?m and it could be exploited to overcome problematic salinity issues. In general, the depth to basement is variable and it increases seaward.  相似文献   

SIFT-FANN: An efficient framework for spatio-spectral fusion of satellite images     

Kunal Kumar Rai  Aparna Rai  Kanishka Dhar  J. Senthilnath  S. N. Omkar  Ramesh K.N 《Journal of the Indian Society of Remote Sensing》2017,45(1):55-65

Image fusion techniques are widely used for remote sensing data. A special application is for using low resolution multi-spectral image with high resolution panchromatic image to obtain an image having both spectral and spatial information. Alignment of images to be fused is a step prior to image fusion. This is achieved by registering the images. This paper proposes the methods involving Fast Approximate Nearest Neighbor (FANN) for automatic registration of satellite image (reference image) prior to fusion of low spatial resolution multi-spectral QuickBird satellite image (sensed image) with high spatial resolution panchromatic QuickBird satellite image. In the registration steps, Scale Invariant Feature Transform (SIFT) is used to extract key points from both images. The keypoints are then matched using the automatic tuning algorithm, namely, FANN. This algorithm automatically selects the most appropriate indexing algorithm for the dataset. The indexed features are then matched using approximate nearest neighbor. Further, Random Sample Consensus (RanSAC) is used for further filtering to obtain only the inliers and co-register the images. The images are then fused using Intensity Hue Saturation (IHS) transform based technique to obtain a high spatial resolution multi-spectral image. The results show that the quality of fused images obtained using this algorithm is computationally efficient.  相似文献