Vivekanand College

Kolhāpur, India

Vivekanand College

Kolhāpur, India
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Patil C.E.,Bharati Vidyapeeths MBSK Kanya Mahavidyalay | Jadhav P.R.,Shivaji University | Tarwal N.L.,Shivaji University | Deshmukh H.P.,Bharati Vidyapeeths y M College | And 2 more authors.
Materials Chemistry and Physics | Year: 2011

Mixed V 2O 5-MoO 3 thin films were deposited onto the glass and fluorine doped tin oxide (FTO) coated glass substrates, at 400 °C by pulsed spray pyrolysis technique (PSPT). Equimolar vanadium chloride (VCl 3) and ammonium molybdate aqueous solutions were mixed together in volume proportions (5-15% molybdenum) and used as a precursor solution for the deposition of mixed V 2O 5-MoO 3 thin films. The structural, morphological, optical and electrochromic properties of the films deposited at different Mo concentrations were studied. With increase in the percentage of Mo the peaks belonging to tetragonal phase of V 2O 5 eventually disappear and the (1 0 1) orthorhombic V 2O 5 phase is observed. Scanning electron microscopy (SEM) shows micro thread like reticulated morphology. The optical band gap energy varied over 2.91-2.85 eV. All the films exhibited cathodic electrochromism in lithium containing electrolyte (0.5 M LiClO 4 + propylene carbonate (PC)). The highest coloration efficiency (CE) for the V 2O 5 film with 15% MoO 3 mixing was found 35.27 cm 2 C -1. © 2010 Elsevier B.V. All rights reserved.

Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Science Research Laboratory | Patange S.M.,Materials Science Research Laboratory | Mane M.L.,SGRG Shinde Mahavidyalaya | And 2 more authors.
Applied Physics Letters | Year: 2012

Dy 3+ substituted Ni-Cu-Zn (Ni 0.4Cu 0.4Zn 0.2Dy xFe 2-xO 4) ferrite nanoparticles were obtained at 600 °C by synthesizing sol-gel auto-combustion method, and they exhibit a particle size of 12-21 nm. X-ray diffraction patterns confirm the presence of secondary phase of DyFeO 3+ and Fe 2O 3 for the Dy 3 substituted samples. Ni-Cu-Zn ferries doped with Dy 3 possess better grain structure and growth than that of pure Ni-Cu-Zn ferrite. The saturation magnetization increases remarkably up to 81 emu/g with increasing the Dy 3+ ions. The increased saturation magnetization related to increased exchange interactions between Fe-Fe ions and also with increased particle size. Blocking temperature was found to decrease with increasing Dy 3+ substitution. An enhancement in initial permeability and Curie temperature was observed with Dy 3+ substitution. © 2012 American Institute of Physics.

Shirsath S.E.,Vivekanand College | Shirsath S.E.,Dr. Babasaheb Ambedkar Marathwada University | Kadam R.H.,Materials Science Research Laboratory | Gaikwad A.S.,Vivekanand College | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2011

Sintering temperature and particle size dependent structural and magnetic properties of lithium ferrite (Li0.5Fe2.5O4) were synthesized and sintered at four different temperatures ranging from 875 to 1475 K in the step of 200 K. The sample sintered at 875 K was also treated for four different sintering times ranging from 4 to 16 h. Samples sintered at 1475 K have the cubic spinel structure with a small amount of α-Fe 2O3 (hematite) and γ-Fe2O3 (maghemite). The samples sintered at≤1275 K do not show hematite and maghemite phases and the crystals form the single phase spinel structure with the cation ordering on octahedral sites. Particle size of lithium ferrite is in the range of 1345 nm, and is depend on the sintering temperature and sintering time. The saturation magnetization increased from 45 to 76 emu/g and coercivity decreases from 151 to 139 Oe with an increase in particle size. Magnetization temperature curve recorded in ZFC and FC modes in an external magnetic field of 100 Oe. Typical blocking effects are observed below about 244 K. The dielectric constant increases with an increase in sintering temperature and particle size. © 2011 Elsevier B.V. All rights reserved.

Mane D.R.,Belbhim College | Birajdar D.D.,Belbhim College | Patil S.,Belbhim College | Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Science Research Laboratory
Journal of Sol-Gel Science and Technology | Year: 2011

Cu0.7- x Co x Zn0.3Fe2O 4 (0 ≤ x ≤ 0.5) nanoparticles are prepared by sol-gel auto combustion method, using copper nitrate, zinc nitrate, ferric nitrate, cobalt nitrate, and citric acid as the starting materials. The process takes only a few minutes to obtain as-received Co-substituted Cu-Zn ferrite powders. X-ray diffraction (XRD), vibrational sample magnetometer and thermo gravimetric analysis are utilized in order to study the effect of variation in the Co substitution and its impact on particle size, lattice constant, density, cation distribution and magnetic properties like magnetization, coercivity, remanent magnetization, ferritization temperature and associated water content. Lattice parameter found to increase with increasing Co content, whereas X-ray density, bulk density, particle size showed decreasing trend with the Co content. Cation distribution indicates that the Co and Cu ion show preference towards octahedral [B] site, Zn occupy tetrahedral (A) site whereas Fe occupy both tetrahedral (A) and octahedral [B] site. Redistribution of cations takes place for x > 0.3. Saturation magnetization (Ms) increases from 52.99 to 79.62 emu/g (x ≤ 0.3), for x > 0.3 Ms decreases with increase in Co content x. However, coercivity, magnetocrystalline anisotropy and remanent magnetization increases with the Co2+ substitution. © 2010 Springer Science+Business Media, LLC.

Adhyapak M.S.,Vivekanand College | Kachole M.S.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Thrombosis and Thrombolysis | Year: 2015

Throughout the world, herbal medicines are consumed by most of the patients without considering their adverse effects. Many herbal medicines/plant extracts have been reported to interact with the natural blood clotting system. In continuation to this effort, thirty medicinal plant extracts were allowed to interact with citrated human blood and the clotting time was measured after re-calcification in vitro using Lee and White method. The aq. leaf ext. of Syzygium cumini and Camellia sinensis significantly prolonged the clotting time. In response to the prothrombin time and activated partial thromboplastin time tests, the ext. of C. sinensis showed normal APTT and marginally prolonged the PT to 16.7 s (control—15.2 s) while S. cumini showed normal PT but significantly prolonged the APTT to 66.9 s (control—20.7 s). This suggests that, C. sinensis acts on the extrinsic pathway while S. cumini on the intrinsic pathway. There are some common herbal formulations that are frequently used by the patients which contain above plant materials, like, Syzygium cumin in anti-diabetic formulations, while the ext. of C. sinensis is consumed frequently as beverage in many part of the world. Hence, patients having known bleeding tendency or haemophilia disease should take into account the interaction potential of these plants with the natural blood clotting system while taking herbal formulations containing above plants; specially, the patients suffering from intrinsic pathway factor deficiency should keep a limit on the consumption of S. cumini while extrinsic pathway factor deficiency patients should limit C. sinensis. Also, the medical practitioners should consider the patient’s food consumption history before doing any major surgical procedures. © 2015 Springer Science+Business Media New York

Raghavender A.T.,Seoul National University | Shirsath S.E.,Vivekanand College | Vijaya Kumar K.,Jawaharlal Nehru Technological University
Journal of Alloys and Compounds | Year: 2011

Nanocrystalline ferrites of compositions Ni0.5+1.5xCu 0.3Zn0.2Fe2-xO4 (0 ≤ x ≤ 0.5) have been synthesized by using oxalate based precursor method at very low temperature. The Ni-Cu-Zn ferrite powder particles were obtained at 450 °C and they exhibit a crystallite size of 16-24 nm. The lattice constants were found nearly equal in all these samples due to minute difference in the ionic radius between Ni2+ and Fe3+ ions. The thermal analysis has showed the ferrite phase formation at very low temperature 377 °C. The two main spectroscopic bands corresponding to lattice vibrations were observed in the wavelength range from 300 to 1000 cm-1. The IR bands at 570 cm-1 (v1) and 390 cm-1 (v2) were assigned to tetrahedral (A) and octahedral [B] groups. The spectroscopic bands shift with the increase of doping concentration. The magnetization was found to decrease with increasing doping concentration. The dielectric constant (ε′) and dielectric loss tangent (tan δ) decreased with increase of frequency. The dielectric constant and dielectric loss obtained for the nanocrystalline ferrite samples appeared to be lower than that of the ferrites prepared by other synthesis techniques. © 2011 Elsevier B.V.

Patil D.S.,Shivaji University | Shaikh J.S.,Shivaji University | Dalavi D.S.,Shivaji University | Karanjkar M.M.,Vivekanand College | And 3 more authors.
Journal of the Electrochemical Society | Year: 2011

Undoped and Mn doped Polyaniline (PANI) thin films were deposited on stainless steel substrates by sonochemical method. Films deposition was done using dip coating technique. To study the Mn doping effect on the specific capacitance of PANI, concentration of Mn was varied from 0.4 to 1.6 wt %. The Fourier Transform-IR (FT-IR) and Raman spectroscopy techniques have been used for the phase identification and determination of the Mn in the PANI films. Surface morphology was examined by using Field Emission Scanning Electron Microscopy (FESEM) which showed nanofiber aggregate structure of undoped PANI and porous and well distributed nanofibers for the doped PANI. The supercapacitive behavior of the electrodes was tested in three electrode system with 1.0 M H2SO4 electrolyte by using cyclic voltammetry. The specific capacitance value increases from 285 to 474 F g-1 as the Mn concentration was increased. This work demonstrates a simple strategy of improving specific capacitance of the polymer and hence may be adopted easily for other dopants also. Thus the work will open a new avenue for designing low cost high performance devices for better supercapcitors. © 2011 The Electrochemical Society.

Tarwal N.L.,Shivaji University | Devan R.S.,National Dong Hwa University | Ma Y.R.,National Dong Hwa University | Patil R.S.,New College | And 2 more authors.
Electrochimica Acta | Year: 2012

The Au-ZnO nanocomposites were deposited onto the glass and tin doped indium oxide (ITO) coated glass substrates by a simple and cost effective spray pyrolysis technique (SPT) at 450 °C. The effect of Au concentration on the properties of ZnO thin films was investigated. The structural evolution of Au-ZnO nanocomposite films with Au doping concentrations is reflected in the X-ray diffraction patterns. The FESEM images reveal uniform and compact distribution of spherical grains/clusters of size ∼60-80 nm. A clear indication of localized surface plasmon resonance (LSPR) is observed in optical studies. The band gap energy decreases with Au content. The overall photoelectrochemical (PEC) performance of the samples was investigated and discussed. Moreover, the Au-ZnO samples are more photoactive as compare to the pure ZnO sample and the sample ZnOAu 15 shows the highest photocurrent. The photocurrent increases up to 279 μA cm -2 and 379 μA cm -2 in visible light and in UV illumination, respectively. An improvement in the PEC output parameters is observed because of the increased absorption as well as the energy transfer mechanism from the noble metal (Au) to ZnO. © 2012 Elsevier Ltd.

Karanjkar M.M.,Vivekanand College | Tarwal N.L.,Shivaji University | Tarwal N.L.,Gwangju Institute of Science and Technology | Vaigankar A.S.,Shivaji University | Patil P.S.,Shivaji University
Ceramics International | Year: 2013

A series of polycrystalline Ni-Cd ferrites were prepared by the ceramic method. The ferrite system exhibits cubic crystal structure. The lattice parameter dependence on Cd content obeys Vegard's law. Mössbauer spectroscopic studies of these ferrites were carried out by measuring average hyperfine field (Hn), quadruple splitting (Qs) and isomer shift (Is). These data are supported by the study of saturation magnetization, which suggests that Neel's two sublattice model governs the behavior of these ferrites up to about x=0.2 and after that triangular spin prevails. Moreover, the electrical properties were studied in the frequency range between 10 kHz and 15 MHz. For different compositions, the dielectric constant shows normal behavior with respect to frequency while loss tangent shows an anomalous behavior. © 2012 Elsevier Ltd and Techna Group S.r.l.

Khanale P.B.,Dsm College | Ambilwade R.P.,Vivekanand College
Journal of Artificial Intelligence | Year: 2011

Fuzzy sets have been applied in medical field where uncertainty plays a major role. Medicine, often on the borderline between science and art, is an excellent example where vagueness, hesitation, linguistic uncertainty, measurement imprecision, natural diversity and subjectivity are prominently present in medical diagnosis. Medical diagnosis is a problem complicated by many and manifold factors and its solution involve all of a human's abilities including intuition and the subconscious. Fuzzy logic is used in diagnosis of pulmonary embolism, cortical malformations, rheumatic and pancreatic diseases, hepatitides and diabetes. Fuzzy inference system is a linguistic frame work by which human thinking process can be modeled. In this study we are presenting a fuzzy inference system that will diagnose the thyroid disease specially a major disorder known as Hypothyroidism. It is the most common thyroid disorder today. Because of uncertain symptoms, it is very difficult to diagnose the disease. Particularly in rural part of India, the correct diagnosis of the disease for female patients takes place at a very later stage and hence the patient suffers physically and economically. An accuracy of 88% is achieved in diagnosis of hypothyroidism. Such system is helpful for patients and doctors to identify disease at early stage. © 2011 Asian Network for Scientific Information.

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