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Sreedhar I.,BITS Pilani Hyderabad Campus | Nahar T.,BITS Pilani Hyderabad Campus | Venugopal A.,Indian Institute of Chemical Technology
Renewable and Sustainable Energy Reviews | Year: 2017

Global warming and associated climate change has resulted in serious efforts towards reducing greenhouse gas emissions, primarily carbon dioxide through carbon capture. There are various technical options in pre- and post-combustion modes available viz., adsorption, absorption, membrane separation, chemical looping combustion with and without oxygen uncoupling and cryogenic separations. Among all these, absorption technology which could be deployed as a post-combustion option to be integrated with power plant, has been commercialized with amines as solvents long back. But there is a long way to go to improve this process in terms of economic viability due to large regeneration costs involved and to make it more environmental friendly with minimum toxic and corrosion problems due to solvents. In this review, absorption based carbon capture has been reviewed comprehensively and critically in terms of various aspects like solvents and their synthesis protocols, performance analysis of different solvent systems, contactors, kinetics and thermodynamics, modeling and simulation studies etc. Every section has been discussed in terms of the trends and developments observed including the contemporary status besides citing future challenges and prospects to improve the technology. © 2017 Elsevier Ltd


Raju B.K.S.P.K.,BITS Pilani Hyderabad Campus | Geethakumari G.,BITS Pilani Hyderabad Campus
Proceeding - IEEE International Conference on Computing, Communication and Automation, ICCCA 2016 | Year: 2016

Cloud computing facilitates the consumption of virtually infinite resources with reduced cost and less maintenance overheads. But the implicit elasticity property of cloud can be misused by adversaries to perform some attacks-either using the cloud or to the cloud itself. An astute intruder will follow certain anti-forensic measures to delete the traces of an attack. In that situation, the evidence identification and collection from the cloud becomes difficult which in turn reduces the efficiency of the entire forensic investigation. To handle this, we propose a model called improved Cloud Forensic Readiness (iCFR). We discuss iCFR in detail along with its practical implications when applied to the cloud environment. © 2016 IEEE.


Thakur G.,BITS PILANI Hyderabad Campus
2016 IEEE 7th Annual Ubiquitous Computing, Electronics and Mobile Communication Conference, UEMCON 2016 | Year: 2016

Long Term Evolution (LTE) Networks are being planned to be upgraded to LTE Advanced along with increasing availability of Release 10 User Equipment (UEs) and Spectrum Availability for Carrier Aggregation. LTE Advanced brings a major step increase in Down Link and Uplink Throughputs and related spectral efficiencies. This paper explains the evolution of Frequency Division Duplex (FDD) throughputs for different Channel Bandwidths. The maximum theoretical physical layer throughputs and expected actual application layer throughputs after removing the necessary overheads by different broadcast, signaling, synchronization & random access channels have been explained with an impact analysis thereof. Throughput gains for upcoming LTE Advanced deployments have been computed for Frame Structure Type 1 (FDD) for Channel Bandwidth of 1.4 MHz, 3MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz along with Carrier Aggregation of 2 & 5 Component Carriers. Impact of increasing Signaling Channels, retransmissions & code rate on throughputs has been explained so that the computations can be extended to any deployment scenario. © 2016 IEEE.


Sirisha A.,Computer Science | Kumari G.G.,BITS Pilani Hyderabad Campus
Proceedings of the 2nd International Conference on Trendz in Information Sciences and Computing, TISC-2010 | Year: 2010

As cloud is an emerging paradigm of computing, it throws open various challenges and issues. The major issue hindering the growth of popularity of usage of cloud computing is Cloud security. There are numerous cloud security issues, of which this paper addresses the problem of insecure APIs. APIs act as the interface between cloud provider and the customer and the security of cloud computing depends largely on the security of these APIs. Hence a strong API access control mechanism is required. This paper proposes a two stage access control mechanism implemented at the API level using the Role Based Access Control Model (RBAC). ©2010 IEEE.


Dinda S.,BITS Pilani Hyderabad Campus | Dinda S.,Reliance Industries Ltd
Separation and Purification Technology | Year: 2013

The adsorption of carbon dioxide (CO2) from simulated flue gas using newly developed solid adsorbents has been studied in the present work. Adsorptive capture of CO2 from flue gas streams is a promising technology for greenhouse gas mitigation. The success of CO2 capture using solid sorbents is greatly dependent on the development of a low cost, regenerable sorbent with high CO2 adsorption capacity. Solid sorbent is expected to offer the benefits over the liquid amines used in the typical absorption process, with the added advantages that solids do not give corrosion problems like liquid amines. In the present study, alkali-impregnated meso-porous solid sorbents have been developed and their performances for CO2 capture from simulated flue gas were evaluated by using a fixed bed reactor. The effect of various process parameters like temperature, CO 2 concentration and loading of active component has been studied. The adsorbent with 20 wt% Na2CO3 loading have shown the best CO2 adsorption capacity among the studied adsorbents and the adsorption capacity lies in the range of 0.35-0.39 mmol/g of adsorbent at a temperature of about 55 °C and atmospheric pressure. © 2013 Elsevier B.V. All rights reserved.


Ravi P.R.,BITS Pilani Hyderabad Campus | Aditya N.,BITS Pilani Hyderabad Campus | Kathuria H.,BITS Pilani Hyderabad Campus | Malekar S.,BITS Pilani Hyderabad Campus | Vats R.,BITS Pilani Hyderabad Campus
European Journal of Pharmaceutics and Biopharmaceutics | Year: 2014

Raloxifene HCl (RLX) shows low oral bioavailability (<2%) in humans due to poor aqueous solubility and extensive (>90%) metabolism in gut. Lipid nanoparticles (SLN) with glyceryl tribehenate were designed to enhance drug's oral bioavailability. Box-Bhenken design was used to optimize manufacturing conditions. Optimized SLN had particle size of 167 ± 3 nm and high encapsulation efficiency (>92%). Oral bioavailability of RLX from SLN was improved by 3.24 folds compared to free RLX in female Wistar rats. Both clathrin and caveolae mediated endocytosis pathways were involved in the uptake of SLN. Lymphatic transport inhibitor, cycloheximide significantly reduced oral bioavailability of SLN. © 2013 Elsevier B.V. All rights reserved.


Kotkunde N.,BITS Pilani Hyderabad Campus | Gupta A.K.,BITS Pilani Hyderabad Campus
Materials Today: Proceedings | Year: 2015

Forming limit diagram (FLD) is aplotofthelimitingprincipalsurfacestrainsthatcanbesustainedby sheet metalspriortotheonsetoflocalized necking. It isusefulforcharacterizingtheformabilityofsheet metal and assessingtheformingseverityofvarious sheet metal processes. In this work, experimental FLD has been determined for Ti-6Al-4V alloy at 400°C using Nakajima test. Nakajima test has been conducted using spherical punch with specimens of different widths as per ASTM: E2218 - 02standard. In order to validate the experimental FLD results, theoretical forming limit diagram has been determined using MarciniakKuczynski (M-K) model. The accuracy of theoretical FLD is largely dependent on the selection yield criteria and hardening models. Here in M-K analysis, CazacuBarlat yield criterion with Hollomon power law (HPL) and Johnson-Cook (JC) hardening model has been considered. The material properties required for determination of yield criteria and hardening models have been calculated using uniaxial tensile tests. The predicted theoretical FLD results have been compared with experimental FLD. The influences of yield criteria and hardening models on the M-K theory parameters and the prediction itself have been investigated in the process. Based on the results; it can be observed that the theoretical FLD using CazacuBarlat with both hardening models has a better agreement with experimental FLD. © 2015 Elsevier Ltd.


Paturi U.M.R.,BITS Pilani Hyderabad Campus | Narala S.K.R.,BITS Pilani Hyderabad Campus
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | Year: 2015

Conventional metal cutting processes involve massive consumption of energy where the specific cutting energy is usually high. A major division of this energy is converted into heat, which creates detrimental effects on cutting tool wear, surface quality of machined workmaterial and dimensional accuracy. Although cutting fluids are effective to coerce this energy transfer, the growing challenge to deal with the environmental and health aspects stood by coolant machining is imposing manufacturers to limit the usage of cutting fluids in current metal cutting practice. This research work introduces a new cutting tool, namely, electrostatic micro-solid lubricant-coated carbide tool with molybdenum disulfide as a solid lubricant. To exploit efficacies of newly developed electrostatic micro-solid lubricant-coated cutting tools in comparison with the uncoated cutting tools in machining processes, cutting forces, tool wear, chip formation and surface finish of machined workmaterial have been practically investigated. The results revealed that electrostatic micro-solid lubricant-coated tools performed much better as compared with that of machining with uncoated tools, and the adeptness of the electrostatic micro-solid lubricant-coated tools can make a potential alternative with additional benefits of being able to accomplish sustainable machining. © IMechE 2014.


Haque A.,BITS Pilani Hyderabad Campus
European Journal of Physics | Year: 2014

We derive the Lorentz self-force for a charged particle in arbitrary non-relativistic motion by averaging the retarded fields. The derivation is simple and at the same time pedagogically accessible. We obtain the radiation reaction for a charged particle moving in a circle. We pin down the underlying concept of mass renormalization. © 2014 IOP Publishing Ltd.


Sreedhar I.,BITS Pilani Hyderabad Campus | Singh M.,BITS Pilani Hyderabad Campus | Raghavan K.V.,Indian Institute of Chemical Technology
Catalysis Science and Technology | Year: 2013

The nitration of toluene is an ubiquitous reaction whose mono nitro products find applications in pharmaceuticals, perfumes, explosives and plastics. The conventional process of treating toluene with mixed acids leads to an undesirable product distribution besides being energy intensive and environmentally unfriendly. Hence the worldwide research on alternative greener technologies has intensified. This paper provides a comprehensive review on the sulfuric acid free nitration of toluene covering alternative options on nitrating agents, catalysts, their properties, compatible solvents, reaction media, process kinetics, mechanisms and reaction engineering studies. New opportunity areas for future research are identified. © 2013 The Royal Society of Chemistry.

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