904 research outputs found
Book Review: Mukul Sharma, Caste and Nature: Dalits and Environmental Politics
No full textSharma V. Book Review: Mukul Sharma, Caste and Nature: Dalits and Environmental Politics. Jadavpur University journal of sociology. 2020;11(11):219-224
Caste and Nature
No full textRarely do Indian environmental discourses examine nature through the lens of caste. Whereas nature is considered as universal and inherent, caste is understood as a constructed historical and social entity. Mukul Sharma shows how caste and nature are intimately connected. He compares Dalit meanings of environment to ideas and practices of neo-Brahmanism and certain mainstreams of environmental thought. Showing how Dalit experiences of environment are ridden with metaphors of pollution, impurity, and dirt, the author is able to bring forth new dimensions on both environment and Dalits, without valourizing the latter’s standpoint. Rather than looking for a coherent understanding of their ecology, the book explores the diverse and rich intellectual resources of Dalits, such as movements, songs, myths, memories, and metaphors around nature. These reveal their quest to define themselves in caste-ridden nature and building a form of environmentalism free from the burdens of caste. The Dalits also pose a critical challenge to Indian environmentalism, which has, until now, marginalized such linkages between caste and nature.</p
Three-phase carbon fiber amine functionalized carbon nanotubes epoxy composite: Processing, characterisation, and multiscale modeling
No full textThe present paper discusses the key issues of carbon nanotube (CNT) dispersion and effect of functionalisation on the mechanical properties of multiscale carbon epoxy composites. In this study, CNTs were added in epoxy matrix and further reinforced with carbon fibres. Predetermined amounts of optimally amine functionalised CNTs were dispersed in epoxy matrix, and unidirectional carbon fiber laminates were produced. The effect of the presence of CNTs (1.0 wt%) in the resin was reflected by pronounced increase in Young's modulus, inter-laminar shear strength, and flexural modulus by 51.46%, 39.62%, and 38.04%, respectively. However, 1.5 wt% CNT loading in epoxy resin decreased the overall properties of the three-phase composites. A combination of Halpin-Tsai equations and micromechanics modeling approach was also used to evaluate the mechanical properties of multiscale composites and the differences between the predicted and experimental values are reported. These multiscale composites are likely to be used for potential missile and aerospace structural applications. © 2014 Kamal Sharma and Mukul Shukla
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Dielectric Properties of Fluid Saturated Rocks
No full textThe objective of this dissertation is to study the effect of wettability, clay content, water saturation and salinity on the electrical properties of hydrocarbon bearing rocks. The frequency range of interest is 10 Hz to 10 MHz. Measurements were made for the impedance of both fully and partially saturated rocks using the four-electrode method and for fully saturated rocks using the two-electrode method. These measurements include both clean and shaly sand samples. For fully saturated rocks, the dielectric constant is found to increase with the clay volume fraction, the cation exchange capacity and the electrochemical potential of the rock samples. It is found to decrease with increasing salinity, frequency, permeability, and porosity. Neither stress, nor wettability appear to significantly influence the dielectric constant of fully brine saturated Berea cores. Empirical correlations between the dielectric constant, frequency, permeability, cation exchange capacity, and porosity are presented for tight gas sands used in this study. These correlations provide a means of estimating important petrophysical parameters such as the permeability and the clay content from a non-destructive complex impedance sweep of tight gas sands fully saturated with brine. A lower critical frequency is found to characterize the geometry of the pore space. For partially saturated rocks, the dielectric constant appears to depend linearly on water saturation above 0.1 MHz and to have a power law dependence on water saturation below 0.1 MHz. This frequency appears to be the limit below which the resistivity index was invariant to frequency and at which all experimental runs displayed a peak in the reactivity index. Wettability effects were pronounced below 10 KHz. The effects observed experimentally are explained on the basis of the Generalized Maxwell-Wagner Theory. It is shown that the model presented by Lima and Sharma agrees quantitatively with the measured effects of porosity, clay content, saturation, grain size, and frequency. The Lima-Sharma theory for modeling the complex impedance of partially saturated shaly sands has been inverted. This inversion allows a log analyst to use low ( < lKHz) and high (> lMHz) complex impedance data from well logs to calculate reservoir petrophysical parameters such as water saturations in the virgin formation and in the flushed zone, porosity, clay volume fraction, clay surface charge density, and grain size.Petroleum and Geosystems Engineerin
Various Approaches for Dynamic Load Balancing for Multiprocessor Interconnection Network
No full textMultiprocessor interconnection network have become powerful parallel computing system for real time applications. Now a days the many researchers doing research on the dynamic load scheduling in multiprocessor system. Load balancing is the method of dividing the total load among the processors of the distributed system to progress tasks response time as well as resource utilization whereas ignoring a condition where few processors are overloaded or underloaded or moderately loaded. However, in dynamic load balancing algorithm presumes no priori information about behaviour of tasks or the global state of the system. There are numerous issues while designing an efficient dynamic load balancing algorithm that involves utilization of system, amount of information transferred among processors, selection of tasks for migration, load evaluation, comparison of load levels and many more. This paper enlightens the performance analysis on dynamic load balancing strategy DLBS algorithm, used for hypercube network in multiprocessor system. Dynamic load scheduling DLB algorithm are required to efficiently solve this problems on multiprocessor systems.In this paper our focus on study and evaluation of various dynamic load balancing strategies such as SID, RID,DEM ,GM HBM etc Mukul Varshney | Dr. Anand Sharma | Abhakiran Rajpoot "Various Approaches for Dynamic Load Balancing for Multiprocessor Interconnection Network" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-4 , June 2017, URL: https://www.ijtsrd.com/papers/ijtsrd2208.pd
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Numerical simulation of ph-sensitive polymer injection as a conformance control method
No full textPolymers such as polyacrylic acid hydrogel are microgel solutions that exhibit large viscosity changes as their pH increases above a critical value. The Huh-Choi-Sharma rheological model developed previously for pH-sensitive polymer was successfully implemented in the commercial GEM-GHG reservoir simulator and tested. With the simulator’s ability to model geochemical reactions and to predict fluid pH, the polymer viscosity model allowed estimation of polymer solution viscosity based on the pH, ionic strength, shear rate and polymer concentration of an aqueous solution. Simulations of linear and radial geometry floods were carried out to test the effectiveness of using high-viscosity fluids and pH-sensitive polymers as an in-depth conformance control method in oil reservoirs.Petroleum and Geosystems Engineerin
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Alternate-slug fracturing using foam
No full textThe success of a hydraulic fracturing job depends primarily on the proper distribution of proppant inside the fracture. Fracture length and conductivity are the two prime characteristics that determine the productivity of fractured wells (Liu & Sharma, 2005). Slick-water fracturing involves the use of large volumes of water for fracturing shales and mudstones (Palisch, et al., 2010). The low viscosity of water increases the settling velocity of proppant, resulting in an ineffective lateral placement of the proppant. It also affects the vertical coverage of the proppant across the pay zone(s), rendering the fracturing process inefficient (Gadde, et al., 2004). To improve proppant placement, a new technique was proposed by Malhotra et al. (2014), that involves pumping slugs of high viscosity and low viscosity fluids alternately, with most of the proppant being carried by the low viscosity fluid. Alternate injection of high viscosity and low viscosity slugs creates a mobility contrast between the fluids and leads to the formation of viscous fingers. The viscous fingers provide a pathway for proppant transport. The higher velocity of the viscous fingers compared to the injection velocity of the fluid leads to deeper placement of proppant. In addition, viscous sweeps, due to the high viscosity slugs, push any proppant bank formed near the wellbore deeper into the fracture, thus creating longer fractures (Malhotra, et al., 2014). In this study, we conducted an experimental investigation to obtain a fundamental understanding of the viscous fingering phenomena when water and foam are used as the low and high viscosity fluids, over a wide range of viscosity ratios. We have derived a relationship between finger-tip velocity and viscosity ratio of the fluids. This relationship will help in designing Alternate-slug fracturing treatments for the foam-water system.Petroleum and Geosystems Engineerin
Comparative effect of <i style="">Ocimum sanctum, Commiphora mukul</i>, folic acid and ramipril on lipid peroxidation in experimentally-induced hyperlipidemia
No full text299-305Treatment with C. mukul and O. sanctum, showed a significant decrease in cholesterol and triglyceride levels respectively. O. sanctum also significantly increased serum HDL-cholesterol compared to control. Serum MDA levels were significantly reduced in all the treated groups compared to control suggesting that each of the drugs under study were effective in their free radical scavenging action. Erythrocyte SOD activity was increased in all the treatment groups with C. mukul showing the maximum effect followed by O. sanctum, folic acid and ramipril. The erythrocyte CAT activity was significantly increased in all the drug treated groups with maximum increase seen in O. sanctum and ramipril treated groups, whereas lesser effects were observed with C. mukul and folic acid groups. Thus, the indigenous drugs, C. mukul and O. sanctum had beneficial effect on hypercholesterolemic rabbit model, both in terms of lipid profile as well as antioxidant potential. Ocimum sanctum was found to be the most promising of all the drugs. Moreover, it could be hypothesized that these plant products along with folic acid and ramipril can be explored for synergistic effect for treatment for hypercholesterolemic conditions.</b
sj-docx-1-eso-10.1177_23969873221139410 – Supplemental material for Prolonged cardiac monitoring for stroke prevention: A systematic review and meta-analysis of randomized-controlled clinical trials
No full textSupplemental material, sj-docx-1-eso-10.1177_23969873221139410 for Prolonged cardiac monitoring for stroke prevention: A systematic review and meta-analysis of randomized-controlled clinical trials by Georgios Tsivgoulis, Lina Palaiodimou, Sokratis Triantafyllou, Martin Köhrmann, Polychronis Dilaveris, Konstantinos Tsioufis, Gkikas Magiorkinis, Christos Krogias, Peter D Schellinger, Valeria Caso, Maurizio Paciaroni, Mukul Sharma, Robin Lemmens, David J Gladstone, Tommaso Sanna, Rolf Wachter, Gerasimos Filippatos and Aristeidis H Katsanos in European Stroke Journal</p
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Characterizing Natural Fractures and Their Interactions with Hydraulically Induced Fractures
No full textNatural fractures are preexisting micro-cracks and fissures that can have a critical impact on hydraulic fracture treatments in shales. Most shale formations contain natural fractures, but the characteristics of these natural fractures can vary significantly. For example, the natural fractures in the Barnett Shale are mostly narrow, long, and sealed with calcite cement. The natural fractures in the Wolfcamp Shale are much more heterogeneous as a whole, but tend to be clustered in similar groupings based on the lithology of certain areas of the formation. The creation and development of natural fractures prior to any hydraulic fracturing treatments is primarily a function of mineralogy, total organic carbon, and in-situ stresses. During hydraulic fracturing treatments, certain characteristics, such as the relative angle between the natural and hydraulic fractures, the length of the natural fractures, the differential stress of the formation rock, and certain completion design variables, will determine how the natural and induced fractures interact and create a fracture network. The creation of a natural fracture network can have a positive effect on the ultimate hydrocarbon recovery in some cases. Natural fractures provide accumulation space and travel pathways for hydrocarbons, which is critical in low porosity and low permeability shales. However, natural fractures can result in higher rates of fluid leakoff, which will result in less efficient hydraulic fracture treatments overall. Also, natural fractures can provide an undesirable connection to water accumulations, which can negatively impact the economics of a well because of the disposal costs associated with water production. This thesis seeks to characterize natural fractures and also to describe the author's work on a hydraulic fracture simulation software that takes the impact of natural fractures into account.Petroleum and Geosystems Engineerin
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