BITS Pilani Hyderabad campus
BITS Pilani Hyderabad campus
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.
Nune M.M.R.,BITS Pilani Hyderabad Campus |
Chaganti P.K.,BITS Pilani Hyderabad Campus
Materials Today: Proceedings | Year: 2017
Turbine blade materials are super alloys and they are under go high temperature during machining process between tool and work piece it causes failure of cutting tool and effect the work piece surface roughness. The cutting fluids are used for reducing the effect of temperature in the cutting zone in this context the present paper investigates the turning of turbine blade material AISI 410 with Tungsten carbide tool under the dry, wet and menthol mixed with water cutting conditions. In the dry lubrication the air passes in the cutting zone at room temperature 25°C. In the wet lubrication only waterflows on cutting zone with different temperature say 10°C, 15°C and 25°C. In the third condition small quantity of crystalline menthol powder added to water and used as a cutting fluid. The cutting fluid pressure, velocity maintained constant in all three cutting conditions. A comparison between dry, wet and minimum quantity of menthol is investigated. Finally the results shown that menthol mixed with water act as a better coolant and it concluded that sustainability of machining process has been increased by replacing conventional cutting fluids with developed eco-friendly cutting fluids. © 2017 Elsevier Ltd.
Datta S.P.,BITS Pilani Hyderabad Campus |
Das P.K.,Indian Institute of Technology Kharagpur
International Journal of Refrigeration | Year: 2017
In an automotive air conditioning system (AACS), the evaporator blower and the condenser fan are powered by a DC power supply containing a storage battery. The unique mutual interaction between the battery and the AACS, when the battery is isolated from the external power supply, has been investigated experimentally. As the prime movers draw power, the charge level of the battery falls and in turn the speed of the prime movers drops continuously. This deteriorates the performance of the condenser and the evaporator. Besides, a Matlab/Simulink based model has been developed to study the characteristics of the said electromechanical system during the charging and discharging cycles of the battery. Steady state performance of the system has also been studied at different battery voltage to supplement the dynamic data. The study reveals the typical deterioration of the cooling capacity and the COP of the system during the gradual derating of the supply voltage. © 2017 Elsevier Ltd and IIR
Uttaravalli A.N.,BITS Pilani Hyderabad Campus |
Dinda S.,BITS Pilani Hyderabad Campus
Materials Today Communications | Year: 2017
Hydroxyl−functionalized ketonic resin was prepared from cyclohexanone and cyclopentanone by self−polymerization technique. A detailed study on thermal stability and decomposition kinetics of the in−house developed resins were performed using thermogravimetric analysis (TGA), and the results were compared with commercial resins. The developed ketonic resins were thermally stable up to the temperature of around 200 °C and the stability was comparable with the studied phenol–formaldehyde and alkyd resins. The apparent activation energy was in the range from 30 to 41 kJ mol−1. For cyclohexanone resins, the rate constant (k) value was in between 1.07 × 10−2 and 15.7 × 10−2 s−1 at the peak temperature. The values of entropy (ΔS*) and free energy (ΔG*) change of activation were found to be in the range from −133 to −145 J mol−1 K−1 and 103–125 kJ mol−1 respectively. The study shows that the apparent activation energy of the resins increased with the increase of resin average molecular weight. © 2017 Elsevier Ltd
Naidu Uttaravalli A.,BITS Pilani Hyderabad Campus |
Dinda S.,BITS Pilani Hyderabad Campus
Materials Today: Proceedings | Year: 2016
In the present work, polymerization reactions of cyclohexanone were carried out in a high-pressure reactor. The effect of reaction parameters such as reaction time, temperature, and catalyst loading on hydroxyl value, iodine value, solubility, and average molecular weight of products was investigated. In the study, reaction time was varied from 10-17 hrs, reaction temperature was varied from 130-150°C, catalyst concentration was varied from 20-40%. The result shows that the degree of polymerization and hydroxyl value of the products increases with the increase of reaction time, temperature and catalyst loading. As the degree of polymerization increases, the decrement in product solubility in a given solvent was observed. FTIR, GPC and TGA analysis was done for the developed products. Based on the present study, it is concluded that the in-house developed resin from cyclohexanone can be used for coating applications. © 2016 Elsevier Ltd. All rights reserved.
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.
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.