1,360,213 research outputs found
The effect of hydrate content on seismic attenuation: A case study for Mallik 2L-38 well data, Mackenzie delta, Canada
No full textObservations of velocities in sediments containing gashydrates show that the strength of sediments increases with hydrate saturation. Hence it is expected that the attenuation of these sediments will decrease with increasing hydrate saturation. However, sonic log measurements in the Mallik 2L-38 well and cross hole tomography measurements in the Mallik field have shown that attenuation increases with hydrate saturation. We studied a range of mechanisms by which increasing hydrate saturation could cause increased attenuation. We found that a difference in permeability between the host sediment and the newly formed hydrate can produce the observed effect. We modelled attenuation in terms of Biot and squirt flow mechanisms in composite media. We have used our model to predict observed attenuations in the Mallik 2L-38 well, Mackenzie Delta, Canada
Vishnuu Mallik
No full textVishnuu Mallik is a 2nd year Ph. D. student in Aerospace Engineering, specializing in Orbital Mechanics and Estimation. He works under the supervision of Dr. Moriba Jah and his research is focused on characterizing Resident Space Objects (RSOs) using non-resolved electro-optical data. He holds an M.S. in Aerospace Engineering Sciences with a certificate in Astrodynamics and Satellite Navigation from the University of Colorado, Boulder, where he worked under the advisement of late Dr. George H. Born. He obtained his Bachelors in Aerospace Engineering and Mechanics from the University of Minnesota, Twin Cities.https://commons.erau.edu/stm-images/1126/thumbnail.jp
Sanjoy Kumar Mallik
No full textSanjoy Kumar Mallik holds a PhD in Art History from the M.S. University of Baroda. He is currently Principal, Kala-Bhavana, Visva-Bharti, Santiniketan where he is Professor in the Department of History of Art. He has taught a semester at the School of Arts & Aesthetics, Jawaharlal Nehru University, New Delhi. His publications include Chittaprosad (DAG, New Delhi, 2011), Gopal Ghosh (NGMA & Akar Prakar with MAPIN, 2013) and Jamini Roy (Rajya Charukala Parshad, Govt. of West Bengal, 2014). He h..
Assimilation-Fractional-Crystallization simulation using pMELTS
No full textFiles generated during pMELTS AFC simulation of three partial melt compositions generated in experiments reported in "A petrologic study on the effect of mantle overturn: Implications for evolution of the lunar interior" by Mallik, Ejaz, Shcheka and Garapi
Review of ground temperatures in the Mallik field area: a constraint to the methane hydrate stability
No full textAnalysis of data from 32 industrial exploration wells in the Mallik field and surrounding area in the Mackenzie Delta-Beaufort Sea region allowed construction of temperature-depth profiles using regional heat-flow values, temperature at the base of ice-bearing
permafrost, and models of thermal conductivity with depth. An analysis of the stability conditions for methane hydrate showed that it is stable in the Mallik field area and that the depth to the base of the methane hydrate stability zone can be as deep as 1500 ± 100 m in areas of thick
permafrost. The depth to the base of the methane hydrate stability zone, calculated in this study using reconstructed temperature-depth profiles, was found in a majority of the wells to be 50-150 m deeper than that previously determined using linear temperature profiles and a constant thermal
conductivity with depth.</jats:p
The principle of operation of the avalanche transistor-based Marx bank circuit: A new perspective.
No full textThe principle of operation of the transistor-based Marx bank circuit has been examined. It was experimentally observed that stage-wise increase of reverse voltage does not occur. This cannot be explained by the principle of operation understood so far. A new explanation, consistent with the experimental observations and associating current-mode second breakdown of transistors, is proposed. A few experimental observations made by earlier workers have also been justified in light of the new current-controlled mechanism
The theory of operation of transistorized Marx bank circuits.
No full textA theory of operation of transistorized Marx bank circuits has been formulated. It has been shown quantitatively that the current-mode second breakdown of transistors is the basic phenomenon involved. The analysis reveals that physical parameters, like the length of and the doping density in the epitaxial collector, the forward dc amplification factor, and the avalanche multiplication gain of the transistors, play important roles in the mechanism. The theory has been applied to explain a number of experimentally observed characteristics of the circuit
Nonuniform doping of the collector in avalanche transistors to improve the performance of Marx bank circuits.
No full textIt is shown that the avalanche multiplication factor of transistors, which plays a key role in the functioning of the Marx bank circuit, can be considerably enhanced when the collector has a Gaussian doping profile, compared to uniform doping. The limiting of the maximum field in the collector, and the base push out are the events involved in the occurrence of the current mode second breakdown of avalanche transistors in the Marx circuit. Calculations show that the limiting of the maximum field, followed by the base push out, is the sequence conducive to the enhancement of the avalanche gain. Preliminary experimental assessment of the doping profiles of the same model of transistors from two different manufacturers supports the proposed idea
Swarnanychus bandipurensis Mallik & Kumar 1998
No full text32. <i>Swarnanychus bandipurensis</i> Mallik & Kumar, 1998 <p> <i>Swarnanychus bandipurensis</i> Mallik & Kumar, 1998.</p> <p> <b>Type host</b> – <i>Grewia hirsuta</i>.</p> <p> <b>Type locality</b> – India.</p> <p> <b>Distribution</b> – Karnataka and Tamil Nadu.</p> <p> <b>Host</b> – <i>Grewia hirsuta.</i></p>Published as part of <i>Chalil, Suada Poolayulla, Kunnathattil, Maneesha, Kaimal, Sangeetha G. & Punathil, Thejass, 2024, A checklist of spider mites (Acari: Tetranychidae) of India, pp. 29-75 in Persian Journal of Acarology 13 (1)</i> on page 41, DOI: 10.22073/pja.v13i1.78022, <a href="http://zenodo.org/record/10943449">http://zenodo.org/record/10943449</a>
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