Solapur, India
Solapur, India

Solapur University , located in Solapur city in Maharashtra state, is one of the newer academic institutions in India. Wikipedia.

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Bandgar B.P.,University of Solapur | Bandgar B.P.,Swami Ramanand Teerth Marathwada University | Gawande S.S.,Swami Ramanand Teerth Marathwada University
Bioorganic and Medicinal Chemistry | Year: 2010

A combinatorial library of β-chlorovinyl chalcones (4) were synthesized by Claisen-Schmidt condensation reaction. Catalytic reaction of substituted 3-chloro-3-phenyl-propenal (2) and 1-(2,4-dimethoxy-phenyl)-ethanone or 1-(4-methoxy-phenyl)-ethanone (3) in alkaline conditions furnished the target compound 5-chloro-1-(2,4-dimethoxy-phenyl)-5-phenyl-penta-2,4-dien-1-one (4). The synthesized compounds were screened for their biological activity viz. anticancer, anti-inflammatory and antimicrobial activities. Synthesized compounds 4g and 4h revealed promising anti-inflammatory activity (66-67% TNF-α and 95-97% IL-6 inhibitory activity at 10 μM). Cytotoxicity of the compounds checked using CCK-8 cell lines and found to be nontoxic to slightly toxic. Furthermore, the anticancer activity (30-40%) was shown by compounds 4d, 4e, 4h and 4b at 10 μM concentrations against ACHN followed by Calu 1, Panc1, HCT116 and H460 cell lines. Some of the compounds 4d, 4e, 4a, 4i and 4b revealed promising antimicrobial activity at MIC 50-100 μg/mL against selected pathogenic bacteria and fungi. © 2010.

Chougule M.A.,University of Solapur | Sen S.,Crystal Technology Section | Patil V.B.,University of Solapur
Journal of Applied Polymer Science | Year: 2012

Polypyrrole (PPy) nanocomposites reinforced with zinc oxide (ZnONPs) nanoparticles are fabricated by spin coating method. The polymer nanocomposite films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), UV-vis spectroscopy and two probe technique. The results were compared with PPy film. Powder XRD analysis demonstrates the crystalline structure of ZnO nanostructures, as well as their corresponding nanocomposites. The SEM images of the nanocomposites show uniform distribution of the ZnO NPs in the PPy matrix. The overall grain size was found to change in nanocomposite films. In the FTIR spectra, the characteristic peaks of pure PPy are observed to shift to higher wave number revels the different interfacial interactions between the ZnO NPs and the PPy matrix. In the UV-vis spectra, absorption peak of PPy shifts to lower wavelengths indicating poor conjugation. The electrical resistivity of PPy-ZnO nanocomposites is observed to depend strongly on the particle loadings and the morphology. © 2012 Wiley Periodicals, Inc.

Chougule M.A.,University of Solapur | Sen S.,Crystal Technology Section | Patil V.B.,University of Solapur
Ceramics International | Year: 2012

Nanocrystalline zinc oxide (ZnO) thin films were deposited onto glass substrates by a spin coating method. These films were characterized for their structural and morphological properties by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The ZnO films are oriented along (1 0 1) plane with the hexagonal crystal structure. These films were utilized in NO 2 sensors. The dependence of the NO 2 response on the operating temperature, NO 2 concentration was investigated. The ZnO film showed selectivity for NO 2 over H 2S compared to NH 3 (SNO 2/SH 2S=3.32 and SNO 2/SNH 3=5.32). The maximum gas response of 37.2% was achieved with 78% stability for ZnO films upon exposure of 100 ppm NO 2 at operating temperature 200 °C. © 2011 Elsevier Ltd and Techna Group S.r.l.

Pawar R.C.,Hanyang University | Lee J.-W.,Hanyang University | Patil V.B.,University of Solapur | Lee C.S.,Hanyang University
Sensors and Actuators, B: Chemical | Year: 2013

Novel cacti-like structure and nanoneedles of zinc oxide (ZnO) were grown onto glass substrate using chemical route at comparatively low temperature (90 °C), and employed for the application of gas sensor. The grown nanostructures were characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM) and Transmission Electron Microscope (TEM) and photoluminescence (PL) spectroscopy. FE-SEM and TEM images showed that vertically aligned ZnO nanoneedles were formed on substrate and secondary branches emanated from primary aligned nanoneedles. PL spectra showed distinctively different peaks for nanoneedles and cacti-like structure where the peak intensities for cacti structures are as high as the one compared for aligned nanoneedles. Also, the intense visible peak detected for cacti structure confirmed the presence of defects due to oxygen vacancy in the grown nanostructures. Further, gas sensing behaviors were studied for these two different nanostructures against nitrogen dioxide (NO2) gas, and their selectivities toward reducing gases such as hydrogen disulfide, ethanol and liquefied petroleum gas were compared. It was found that cacti-like structure exhibited high gas response at 200 ° C and is selective for NO2 gas as compared with that for nanoneedles. The improved gas response is due to high surface area of cacti structure and presence of oxygen vacancies. Moreover, the contact between two adjacent cacti branches creates barrier potential at junction, which controls its resistance of sensors resulting in high gas sensing. Therefore, novel cacti-like nanostructure demonstrated to be the best candidate as NO2 gas sensor at low cost and temperature. © 2012 Elsevier B.V. All rights reserved.

Bewoor A.K.,Vishwakarama Institute of Information Technology | Pawar M.S.,University of Solapur
International Journal of Six Sigma and Competitive Advantage | Year: 2010

Industries are continuously facing fierce competition and the challenge of meeting increasing demands for higher quality products at economic costs. The success of an organisation is directly related to how effective its implementation of continuous improvement (CI) is. For any industry, quality management system (QMS) and Six Sigma are important CI methodologies. Effective understanding of these methodologies and their relationship will provide an industry with a competitive advantage. Many industrial organisations today are using either QMS or Six Sigma or both as the core for their CI efforts. As such, the relationship between QMS and Six Sigma is worth further investigation. In this paper, QMS and Six Sigma are introduced followed by a thorough comparison. More particularly, this work analyses Six Sigma-DMAIC methodology steps w. r. to QMS [viz. ISO 9000:2000, TS 16949, QS 9000] requirements and identified macro/micro level critical links between them. Further, managerial and operational level frameworks for the integration of the Six Sigma-DMAIC steps as a part of company's existing QMS is proposed. Finally, this case study based research work concludes that, integrating 'QMS + Six Sigma' is an effective and novel approach which will provide an improved approach for CI. Copyright © 2010 Inderscience Enterprises Ltd.

Hegadi R.S.,University of Solapur
Advances in Intelligent Systems and Computing | Year: 2013

A simple multilayer feed forward neural network based classification of handwritten as well as printed Kannada numerals is presented in this paper. A feed forward neural network is an artificial neural network where connections between the units do not form a directed cycle. Here four sets of Kannada numerals from 0 to 9 are used for training the network and one set is tested using the proposed algorithm. The input scanned document image containing Kannada numerals is binarized and a negative transformation is applied followed by noise elimination. Edge detection is carried out and then dilation is applied using 3 x 3 structuring element. The holes present in this image are filled. Every image is then segmented out forming 50 segmented images each containing one numeral, which is then resized. A multilayer feed forward neural network is created and this network is trained with 40 neural images. Then testing has been performed over ten numeral images. The proposed algorithm could perfectly able to classify and recognize the printed numerals with different fonts and hand written numerals. © 2013 Springer.

Nalage S.R.,University of Solapur | Navale S.T.,University of Solapur | Patil V.B.,University of Solapur
Measurement: Journal of the International Measurement Confederation | Year: 2013

Polypyrrole (PPy)-nickel oxide (NiO) hybrid nanocomposite thin films have been prepared by spin coating method. The PPy-NiO hybrid nanocomposites were characterized for structural, morphological, optical and electrical analysis, and the results were compared with the pure PPy films. The structural and optoelectronic properties of PPy-NiO hybrid nanocomposites are quite different from those of pure PPy and NiO nanoparticles, which were attributed to the strong interaction between the PPy and NiO nanoparticles. The XRD pattern shows that broad peak of PPy becoming weaker on increasing the content of NiO nanoparticles in the PPy-NiO hybrid nanocomposites. Also the diffraction peaks of NiO nanoparticles in PPy-NiO (10-50 wt%) nanocomposites were found to shift to lower 2θ values. The morphological studies revealed that the transformation of granular morphology of PPy to the nanospheres and clusters in the PPy-NiO hybrid nanocomposites. FTIR spectra of PPy-NiO hybrid nanocomposites, revealed that the main absorption at 1204 cm-1 and 1559 cm-1 are affected by the presence of NiO nanoparticle in pure PPy and get shifted to 1216 cm-1 and 1570 cm-1 respectively indicates, insertion of NiO nanoparticles in the PPy-NiO hybrid nanocomposite. UV-vis absorption spectrum of PPy corresponding to λmax = 442 nm is blue shifted to λmax = 375 nm in the PPy-NiO hybrid nanocomposites, reveals strong interaction between PPy and NiO nanoparticles. The room temperature dc electrical conductivity is increased from 8.66 × 10-9 to 4.08 × 10-7 (Ω/cm)-1 as the content of NiO nanoparticles increased from 10 to 50 in wt% in the PPy-NiO hybrid nanocomposites. © 2013 Elsevier Ltd. All rights reserved.

Navale S.T.,University of Solapur | Khuspe G.D.,University of Solapur | Chougule M.A.,University of Solapur | Patil V.B.,University of Solapur
Organic Electronics: physics, materials, applications | Year: 2014

Polypyrrole (PPy), α-Fe2O3 and their hybrid nanocomposites have been successfully prepared using chemical polymerization, sol-gel and solid state synthesis method respectively. Films of PPy, α-Fe2O3 and PPy/α-Fe2O3 nanocomposites were deposited on glass substrates using spin coating technique and characterized using FTIR, XPS, FESEM, TEM techniques as well as their gas sensing performance were studied towards NO2 gas. FTIR and XPS study confirms the formation of PPy, α-Fe2O3 and PPy/α-Fe2O3 hybrid nanocomposites. FESEM studies revealed that, the films consists of porous granular type of morphology. TEM analysis revealed that the hybrid composite is in nano range. Impedance spectroscopy studies in presence of air and after exposure of NO2 gas were carried out on PPy, α-Fe2O3 and PPy/α-Fe2O3 hybrid nanocomposite films in the frequency range of 20 Hz-10 MHz. Impedance spectroscopy results demonstrate that, the impedance is mainly contributed by the potential barrier at grain boundaries of the films. With the help of impedance spectroscopy results, sensing mechanism between PPy, α-Fe2O3 and PPy/α-Fe2O3 hybrid nanocomposite films and NO 2 gas molecules was studied and explored. © 2014 Elsevier B.V. All rights reserved.

Chavan H.V.,University of Solapur | Bandgar B.P.,University of Solapur
ACS Sustainable Chemistry and Engineering | Year: 2013

A simple, efficient, and environmentally benign protocol for the synthesis of 3-carboxycoumarins and cinnamic acids via Knoevenagel condensation has been achieved using aqueous extract of Acacia concinna pods as a naturally occurring surfactant type catalyst. We found for the first time that the aqueous extract of Acacia concinna pods could effectively catalyze the condensation of Meldrum's acid with salicyaldehyde/aromatic aldehyde to yield 3-carboxycoumarins and cinnamic acids in excellent yields under mild conditions. The low cost, easy availability of the catalyst, and simple reaction conditions suggest the possible use of the present method for large scale preparations. © 2013 American Chemical Society.

Mane A.T.,University of Solapur | Navale S.T.,University of Solapur | Patil V.B.,University of Solapur
Organic Electronics: physics, materials, applications | Year: 2015

We demonstrate the chemiresistive NO2 gas sensor based on DBSA doped PPy-WO3 hybrid nanocomposites operating at room temperature. The sensor was fabricated on glass substrate using simple and cost effective drop casting method. The gas sensing performance of sensor was studied for various toxic/flammable analytes like NO2, C2H5OH, CH3OH, H2S and NH3. The sensor shows higher selectivity towards NO2 gas with 72% response at 100 ppm. Also the sensor can successfully detect low concentration of NO2 gas upto 5 ppm with reasonable response of 12%. Structural, morphological and compositional analyses evidenced the successful formation of DBSA doped PPy-WO3 hybrid nanocomposite with uniform dispersion of DBSA into PPy-WO3 hybrid nanocomposite and enhance the gas sensing behavior. We demonstrated that DBSA doped PPy-WO3 hybrid nanocomposite sensor films shows excellent reproducibility, high stability, moderate response and recovery time for NO2 gas in the concentration range of 5-100 ppm. A gas sensing mechanism based on the formation of random nano p-n junctions distributed over the surface of the sensor film has been proposed. In addition modulation of depletion width takes place in sensor on interaction with the target NO2 gas has been depicted on the basis of schematic energy band diagram. Impedance spectroscopy was employed to study bulk, grain boundary resistance and capacitance before and after exposure of NO2 gas. The structural and intermolecular interaction within the hybrid nanocomposites were explored by Raman and X-ray photoelectron spectroscopy (XPS), while field emission scanning electron microscopy (FESEM) was used to characterize surface morphology. The present method can be extended to fabricate other organic dopent-conducting polymer-metal oxide hybrid nanocomposite materials and could find better application in the gas sensing. © 2015 Elsevier B.V. All rights reserved.

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