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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. Source

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. Source

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. Source

Akula M.,BITS Pilani Hyderabad campus | El-Khoury P.Z.,Pacific Northwest National Laboratory | Nag A.,BITS Pilani Hyderabad campus | Bhattacharya A.,BITS Pilani Hyderabad campus
RSC Advances | Year: 2014

A novel fluorescent Zn2+ sensor, 4-(pyridin-2-yl)-3H-pyrrolo[2, 3-c]quinoline (PPQ), has been designed, synthesized and characterized by various spectroscopic and analytical techniques. PPQ exhibits superior detection of Zn2+ in the presence of various cations tested, including Cd 2+ and Hg2+, via shifting its emission maxima and fluorescence intensity enhancement. An emission wavelength at 500 nm, ensures probable non-interference from cellular components while performing biological applications. © the Partner Organisations 2014. Source

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. Source

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