H i in very metal-poor galaxies: the SBS 0335–052 system     

B. Ekta  Simon A. Pustilnik  Jayaram N. Chengalur 《Monthly notices of the Royal Astronomical Society》2009,397(2):963-970

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Phase stability and kinetics of methane hydrate formation in presence of calcium and magnesium carbonate     

Ekta Chaturvedi  Krishan Patidar  Sukumar Laik 《Marine Georesources & Geotechnology》2019,37(1):57-66

The huge amount of methane hydrate deposits identified in deep marine sediments is considered as the new resource for future energy. Since carbonates are one of the major components of marine sediments, in the present study, an investigation has been made to study methane hydrate stability and kinetics in the presence of CaCO₃ and MgCO₃. Effect of the presence of carbonates on the solubility of methane in the system has also been examined as it directly affects the hydrate formation process. It has been observed that in presence of CaCO₃ and MgCO₃, the hydrate formation is inhibited. Comparative studies have also been done in the presence of artificial seawater to consider the effect of presence of different salts. Mole consumption of methane gas during hydrate formation in different carbonate samples was measured using real gas equation and found to be minimum in CaCO₃ in seawater sample due to the combined effect of the presence of CaCO₃ and different salts of seawater. An increase in nucleation and induction time was also observed demonstrating the inhibition of hydrate formation in the presence of these components. Further, the decrease in hydrate formation rate also confirmed the inhibition effect of CaCO₃ and MgCO₃ on hydrate formation.  相似文献   

Archaeological Exploration in Srirangapatna and Its Environ Through Remote Sensing Analysis     

Ekta Gupta  Sonia Das  M. B. Rajani 《Journal of the Indian Society of Remote Sensing》2017,45(6):1057-1063

This study involves exploration of archaeological structures in Srirangapatana and virtual reconstruction of Srirangapatana fort using geo-spatial techniques. Antiquity of this river island town goes back to ninth century AD which continued till British rule and hence has abundance of archaeological structures on it. Some of these structures are known and well-maintained while others are unprotected, unexcavated, hidden under thick vegetation or forgotten. To identify archaeological features such as buried/dilapidated/vegetation infested structures/features on ground, we used high resolution multispectral remote sensing data (0.5 and 5.6 m), Cartosat 1 stereo pairs (2.5 m), anaglyphs, historical documents, and analysed them on GIS platform. This study enabled us to: trace the concentric moats and fort-wall by using false colour composite image together with anaglyphs generated from Cartosat 1 stereo pair; explore hitherto unexplored and unexcavated archaeological features; identify unknown and abandoned temples/structures smothered with wild vegetation; locate exact location of currently non-existent site mentioned in historical records; identify the location of buried canal. This study also demonstrates how methodic use of various interpretation keys, image processing and analysis (such as NDVI, DEM, anaglyphs) can help in extracting archaeological features and direct archaeologists for further exploration.  相似文献   

H i studies of extremely metal-deficient galaxies – II. Giant Metrewave Radio Telescope observations of SBS 1129+576     

Ekta    Jayaram N. Chengalur  Simon A. Pustilnik 《Monthly notices of the Royal Astronomical Society》2006,372(2):853-861

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