Kota, India

University of Kota

Kota, India

The University of Kota is a public university in Kota, Rajasthan, India. It was established with the ascent of the Governor of Rajasthan, and recognized by the UGC in 2003 under the state act. It offers both undergraduate and postgraduate courses. Her Excellency Smt. Margaret Alva, The Governor of Rajasthan, is the chancellor and Prof Madhu Sudan Sharma is the vice Chancellor of the university. At present, the University of Kota has 175 affiliated colleges and autonomous departments across the six districts of the Rajasthan state, Kota,Jhalawar, Bundi, Baran, Karauli and Sawai Madhopur are under the territorial jurisdiction of the University. The University has six faculties Arts, Science, Social science, Commerce and Management, Law and Education. Wikipedia.

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Heda N.L.,University of Kota
Computational Materials Science | Year: 2013

We present Compton profiles and Mulliken population (MP) data on charge re-organization of tungsten trioxide using pseudopotential approach within linear combination of atomic orbitals (LCAOs). Different exchange and correlation potentials to density functional theory (DFT) as embodied in the LCAO calculations have been validated using the first ever Compton profile measurement employing 20 Ci 137Cs source. The MP data have shown transfer of electrons from W sites which are found to be unevenly distributed among the non-equivalent six O atoms. The computed Compton profiles are found to be in reasonable agreement with the experimental data. Going beyond the LCAO calculations, energy bands, density of states (DOSs) and band gap are also reported using full potential augmented plane wave (FP-LAPW) method with DFT scheme. The FP-LAPW based partial and total DOS have also been discussed in terms of the MP data. © 2013 Elsevier B.V. All rights reserved.

Heda N.L.,University of Kota
Radiation Physics and Chemistry | Year: 2015

We present the first ever Compton profile measurement of WO2 using a 20 Ci 137Cs γ-ray source. The experimental data have been used to test different approximations of density functional theory in linear combination of atomic orbitals (LCAO) scheme. It is found that theoretical Compton profile deduced using generalized gradient approximation (GGA) gives a better agreement than local density approximation and second order GGA. The computed energy bands, density of states and Mulliken[U+05F3]s populations (MP) data confirm a metal-like behavior of WO2. The electronic properties calculated using LCAO approach are also compared with those obtained using full potential linearized augmented plane wave method. The nature of bonding in WO2 is also compared with isoelectronic WX2 (X=S, Se) compounds in terms of equal-valence-electron-density profiles and MP data, which suggest an increase in ionic character in the order WSe2→WS2→WO2. © 2014 Elsevier Ltd.

Bhati P.S.,Rajasthan Technical University Kota | Gupta R.,University of Kota
International Journal of Electrical Power and Energy Systems | Year: 2013

A robust fuzzy logic power system stabilizer (FLPSS) based on evolution and learning is proposed in this paper. A hybrid algorithm that combines learning and evolution is developed whereby each one complements other's strength. Parameters of FLPSS are encoded in chromosome (individual) of genetic algorithm (GA) population. Population of FLPSS in GA learns to stabilize electromechanical oscillations in power system at an operating point, as the best fitness becomes large steady value during successive generations. Operating region of FLPSS is enlarged by learning more operating points over the operating domain. Best FLPSS drawn from last generation is saved as designed FLPSS. Effectiveness of the proposed method is validated on a single machine infinite bus (SMIB) power system. Promising optimal stabilizing performance with designed FLPSS for considered power system is obtained at wide range of operating points. © 2013 Elsevier Ltd. All rights reserved.

Jain D.,University of Kota | Mishra M.,Dharmsinh Desai University | Rani A.,University of Kota
Fuel Processing Technology | Year: 2012

A series of solid base catalysts were synthesized by functionalization of different weight fractions (5, 10, and 15 wt.%) of 3-aminopropyltrimethoxysilane (APTMS) on thermally activated F- type fly ash (SiO 2 and Al 2O 3 > 70%). Catalyst characterization was undertaken using different analytical techniques such as FTIR, XRD, SEM-EDX, TEM, N 2 - adsorption desorption, BET surface area analysis, TGA and AAS. The results showed that appropriate amount (10 wt.%) of aminopropyl groups results in excellent catalytic performance tested for condensation of ethyl cyanoacetate and cyclohexanone at 120 °C to produce Ethyl (cyclohexylidene) cyanoacetate (92% yield), an important intermediate of gabapentin (Neurontin), widely used in the treatment of epilepsy to relieve neuropathic pain, under solvent free conditions and in low cost route. The catalyst NH 2FA-10 was reusable up to three reaction cycles. The work reports an innovative use of solid waste fly ash as an effective solid base catalyst. © 2011 Elsevier B.V. All rights reserved.

Khatri C.,University of Kota | Mishra M.K.,Dharmsinh Desai University | Rani A.,University of Kota
Fuel Processing Technology | Year: 2010

Synthesis of highly active nano-crystalline, thermally stabilized solid acid catalyst has been reported by loading different weight fractions of sulfated zirconia on chemically activated fly ash through two step sol-gel technique. The catalysts were characterized using powder XRD, FT-IR, N 2-adsorption desorption study, CHNS elemental analysis, SEM-EDAX and their acidity were measured by pyridine adsorbed FTIR. Liquid phase benzylation of benzene and toluene with benzyl chloride was studied as test reaction for catalytic activity of SZF catalysts. A very high conversion of benzene (87%) and toluene (93%) were observed, which is attributed to significant amount of acid site on the catalyst surface. The FTIR study of the pyridine adsorbed samples reflects the presence of Brønsted as well as Lewis acid sites. The catalyst with 12 wt.% zirconia (SZF-12) was regenerated and reused up to four reaction cycles with equal efficiency as in the first run. © 2010 Elsevier Ltd. All rights reserved.

Jakhar S.,Center for Renewable Energy and Environment Development | Misra R.,Government Engineering College | Bansal V.,University of Kota | Soni M.S.,BITS Pilani
Energy and Buildings | Year: 2015

In the present research thermal performance of earth air tunnel heat exchanger (EATHE) coupled with a solar air heating duct has been experimentally evaluated for arid climate of Ajmer city of northwestern India, during winter season. An attempt has been made to enhance the heating capacity of EATHE system by coupling it with a solar air heating duct at the exit end. Results show that the air which comes out of coupled EATHE system is relatively hotter than the air supplied by the stand alone EATHE system. It was found that the heating capacity of EATHE system got increased by 1217.625-1280.753 kWh when it was coupled with solar air heating duct with a substantial increase in room temperature by 1.1-3.5 °C. The COP of the system also increased up to 4.57 when assisted with solar air heating duct. Therefore, the heating capacity of EATHE can be significantly increased by coupling it with solar air heating duct. © 2014 Elsevier B.V.

Jain D.,University of Kota | Khatri C.,University of Kota | Rani A.,University of Kota
Fuel | Year: 2011

A new type of solid base catalyst was synthesized by chemical and thermal activation of fly ash, collected from Thermal Super Power Station situated in Kota, Rajasthan, India. The chemical activation was carried out by 50 wt.% NaOH followed by thermal activation at 450 °C. The modified physiochemical property of solid base fly ash (SBFA) was determined by X-ray diffraction, FT-IR spectroscopy, Scanning Electron Microscopy, N2 adsorption-desorption studies and Flame Atomic Absorption Spectrophotometry. The results reveal that the catalyst is nano-crystalline in nature with crystallite size 11 nm and particle size in the range 840 nm to 6.95 μm. The surface basicity and therefore, catalytic activity in SBFA was originated by increased hydroxyl content as compared to fly ash, suggesting that the catalyst possess higher surface active sites. The basicity of the catalyst was measured by liquid phase, solvent free, single step condensation of benzaldehyde with cyclohexanone giving higher conversion (>70%) and selectivity (>80%) of desired product α,α′-dibenzylidenecyclohexanone. This excellent conversion shows that the catalyst has sufficient basic sites both on the surface and in the bulk, responsible for the catalytic activity. Furthermore, this catalyst may replace conventional environmentally hazardous homogeneous liquid bases making an ecofriendly; solvent free, solid base catalyzed process. The application of fly ash to synthesize a solid base catalyst finds a noble way to utilize this abundant waste material. © 2011 Elsevier Ltd. All rights reserved.

Jain D.,University of Kota | Khatri C.,University of Kota | Rani A.,University of Kota
Fuel Processing Technology | Year: 2010

A new type of solid base catalyst has been prepared by loading of CaO on thermally activated fly ash, with the aim of being used as heterogeneous catalyst for fine chemical production. The prepared fly ash supported calcium oxide catalyst (FAC) was characterized by FT-IR spectroscopy, X-ray diffraction analysis, Scanning Electron Microscopy and atomic absorption spectroscopy. The catalytic activity of FAC was evaluated by Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate as model test reaction under optimized conditions. The catalyst gave very high conversion (87%) of benzaldehyde to desired product ethyl (E)-a-cyanocinnamate with high purity. The catalyst was completely recyclable without significant loss in activity up to three reaction cycles, which confers its stability during reaction unlike commercial catalysts. Moreover this catalyst shows a promising future in providing environmentally clean process for the industrial sector. © 2010 Elsevier B.V. All rights reserved.

Bhardwaj N.,University of Kota
Oriental Journal of Chemistry | Year: 2013

The present study comprises determination of stability constant and the thermodynamics of interaction of transition metal ion Mn(II) with antibiotics Ciprofloxacin. The formation of 1:1 and 1:2 metal ligand complexes are found to be formed in 50 %( v/v) methanol - water system. The stability constant values for metal-ligand system compared at three temperetures, it is found that value of stability constant decreases with increasing temperature. This is in agreement with the conclusion of Pitzer1.

Khatri C.,University of Kota | Jain D.,University of Kota | Rani A.,University of Kota
Fuel | Year: 2010

An efficient solid Lewis acid, has been synthesized by loading cerium triflate (7 wt%) on the acid activated fly ash with high silica content (81%). The physico-chemical properties of synthesized fly ash-supported cerium triflate catalyst (CFT) were monitored by XRD, FT-IR spectroscopy, FT-IR spectroscopy of the ammonia adsorbed catalyst, SEM-EDAX, TEM, Flame Atomic Absorption Spectrophotometer and TG-DTA study. The increased concentration of silica surface hydroxyl groups on activated fly ash have a major influence on the loading of cerium triflate. The catalytic activity of the catalyst CFT was tested in the acylation of veratrole using acetic anhydride as the acylating agent. The proposed model structure of CFT shows that the triflate species withdraws the electron density from the surface cerium making it electron deficit and generate Lewis acidity on the surface of fly ash as confirmed by NH3 adsorbed FT-IR spectrum. The activity data indicate that this heterogeneous catalyst is very active, corresponding to high conversion (88%) of veratrole to 3,4-dimethoxyacetophenone. The catalyst could be easily recovered and reused giving similar conversion up to three reaction cycles indicating its stability under experimental conditions. Thus fly ash-supported cerium triflate is a novel and efficient catalyst and is a promising way of bulk utilization of waste fly ash by developing cost effective catalyst system for industrially important Friedel-Crafts acylation reactions. © 2010 Elsevier Ltd. All rights reserved.

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