Mahadev Uplane | Pune University (original) (raw)

Papers by Mahadev Uplane

$Research paper thumbnail of Effect of Indium Doping on the Properties of Sprayed Cd_{0.8} Zn_{0.2}S Films$

Turkish Journal of Physics, 1996

ABSTRACT Indium doped mixed sulphide films were prepared by the spray pyrolysis technique on glas... more ABSTRACT Indium doped mixed sulphide films were prepared by the spray pyrolysis technique on glass substrates by spraying aqueous solutions of Cadmium chloride, Zinc Chloride, Indium Trichloride and Thiourea. The Indium doping concentration was varied from 0.025% to 2.00% by weight. It is found that the film thickness increases with increase in doping concentration. The electrical and optical properties of the films such as dark conductivity thermoelectric power and optical absorption were studied. The films prepared with 1% by weight doping concentration show high thermoelectric power and dark conductivity.

International Journal of Microwave and Optical Technology

ABSTRACT

Solar Cells, 1983

Alloyed Cdl_~Zn~S films were prepared on glass and conducting glass (15 ~2/[:]) substrates using ... more Alloyed Cdl_~Zn~S films were prepared on glass and conducting glass (15 ~2/[:]) substrates using the spray pyrolysis technique at various substrate temperatures. The photoelectrochemical cells Cdl_~Zn~S]NaOH-Na2S-S[C were formed, and their electrical and optical properties were studied. An attempt was made to explain the effect of substrate temperature on the performance of the photoelectrochemical cells.

Reduction in the number of component is a live problem in the domain of power electronics, as it ... more Reduction in the number of component is a live problem in the domain of power electronics, as it is directly leads to reliability implication. Further reduction in active switches in the inverter topology is also beneficial for the cost factor point of view. In view of this, the present paper reports a novel inverter topology based on only four active switches as against the six switches topology widely reported in the literature. The said design is verified using PSIM software. The result shows good resemblance between our proposed four switches topology and conventional six switches topology.

2010 International Conference on Recent Trends in Information, Telecommunication and Computing, 2010

ABSTRACT This paper presents the development of an on-line version of a new auto-tuning algorithm... more ABSTRACT This paper presents the development of an on-line version of a new auto-tuning algorithm for proportional-integral - derivative (PID) controllers based on the successive approximation method. The new auto tuner causes only minor perturbation on the normal operation of the process, needs little a prior information, and is robust to noise. The performance and design for automatic selection of the PID constants are also discussed. The accuracy and performance of this new auto-tuning method have been substantiated by extensive lab works.

Materials Chemistry and Physics, 2000

Cadmium telluride thin films have been prepared by galvanostatic electrodeposition method using e... more Cadmium telluride thin films have been prepared by galvanostatic electrodeposition method using ethylene glycol bath onto different substrates at deposition temperature of 80 • C. The films were characterized by X-ray diffraction, optical absorption, scanning electron microscopy and photoelectrochemical techniques. The effect of CdTe film annealing in nitrogen atmosphere on structural, optical and morphological was studied. X-ray diffraction study showed that films are polycrystalline with hexagonal phase. Optical absorption study revealed that CdTe is a direct band gap material with band gap of 1.52 eV. Scanning electron microscopy study revealed that the films are homogeneous without cracks or holes. No significant changes in crystal structure, optical bandgap and crystallinity were observed after annealing. From photoelectrochemical studies, it exhibited n-type conductivity.

Materials Chemistry and Physics, 1998

Thin films of CdS have been electrodeposited from an acidic bath using CdSO4, Na2S203 and EDTA at... more Thin films of CdS have been electrodeposited from an acidic bath using CdSO4, Na2S203 and EDTA at pH 5 to 6 on to the stainless steel and fluorine-tin oxide (FTO) coated glass substrates. The structural, optical and photoelectrochemical properties of these films have been studied. An X-ray diffraction study revealed that CdS films deposited at 70°C are polycrystalline with a single hexagonal phase. The optical absorption studies showed that the bandgap of CdS is 2.42 eV. In order to increase the conductivity, the as-deposited films were annealed in a nitrogen atmosphere. CdS films deposited on to stainless steel substrates showed better I~c and Vow, as compared to FrO coated glass substrates.

Journal of Electrical & Electronic Systems, 2021

International Journal of Software Innovation, 2022

Image scene categorization is the dominant research area, where the localization of the objects a... more Image scene categorization is the dominant research area, where the localization of the objects along with the background is performed. At the current scenario, existing classifiers fail to provide the accuracy for the classification. Therefore, a novel approach for image scene categorization is performed using the hybrid features and the Hybrid technique named Mayfly Moth Flame (MAMF) optimization algorithm dependent Deep Convolutional Neural Network (MAMF-based Deep CNN) classifier, which positively impacts on the classification accuracy. This algorithm tunes the classifier towards acquiring the optimal classification performance from the classifier and is developed through interbreeding the characteristic features of the vermins and the caddisflies. The significance of the hybrid features for the classification is implemented and analyzed using the MAMF-based deep CNN classifier. The experimental analysis reveals that the proposed Hybrid features with MAMF-based Deep CNN classifi...

Smart Intelligent Computing and Applications, 2018

Catholic Mass. 4 Of the four that Kingsbury mentions, he writes: Despite their commonality of gen... more Catholic Mass. 4 Of the four that Kingsbury mentions, he writes: Despite their commonality of genre, each of the four is vastly different from the other three. Although all four are easily at home in the service of worship, his Mass (2000) and Missa Brevis (2008) [sic] 5 are equally suitable for a concert setting. The remaining two, St Anne's Mass and The Galloway Mass, are unique in that they are intended solely to be service music. 6

This paper presents a low-cost design of flyback converter in high-voltage and low-power applicat... more This paper presents a low-cost design of flyback converter in high-voltage and low-power application. The flyback converter is designed with the E–I Ferrite core MTC transformers with high permeability and high saturation point. The control circuit is designed around the integrated chip of UC3844 fixed frequency current mode controller incorporated with error amplifier, current sensing comparator, and a high totem pole output driver. External biasing is not required for the control circuit as it is directly biased from the high-voltage line and high-frequency transformer. Isolation is provided by transformer and optocoupler for input–output and power control circuit, respectively. Voltage and current are sensed through the resister divider circuit and shunt resistor, respectively. Control characteristics and performance of the flyback converter are simulated using PSIM software, and 20 W flyback converter hardwire circuit is built to validate the analytical results under variable lo...

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS), 2015

Cadmium zinc oxide (CdXZn1-XO) thin films were deposited at low substrate temperature using advan... more Cadmium zinc oxide (CdXZn1-XO) thin films were deposited at low substrate temperature using advanced spray pyrolysis technique. Aqueous solution of cadmium acetate and zinc acetate were used as initial ingredients. The films were prepared by keeping optimized preparative parameters constant. Influence of variation of zinc in the `CdXZn1-XO' system on the structural, electrical and gas sensing properties of the films has been investigated. X-ray diffraction studies indicate polycrystalline nature of the films. Field emission scanning electron micrograph measurements reveal that the grain size decreases with increase in zinc content. It is found that films are sensitive to H2S gas and maximum response is observed at the operating temperature of 300°C.

Simple and cost-effective spray-CVD technique was used to synthesize highly sensitive Zinc oxide ... more Simple and cost-effective spray-CVD technique was used to synthesize highly sensitive Zinc oxide (ZnO) thin films using zinc acetate precursor. The films were deposited on the glass substrates kept at three different temperatures (below 250o C). X-ray diffraction (XRD) analysis revealed polycrystalline nature with wurzite structure. The sensitivity to the LPG gas was studied by varying operating temperature and gas concentration. Maximum sensitivity of 19% was achieved at 10 ppm LPG at 325ºC. The response and recovery times were low at higher operating temperature.

Sensors and Actuators B Chemical

International Journal of ChemTech Research

Abstract : Hydrogen sulfide (H 2 S) is a corrosive, malodorous toxic and flammable gas. It is nor... more Abstract : Hydrogen sulfide (H 2 S) is a corrosive, malodorous toxic and flammable gas. It is normally generated from mines, sewage, gasoline, petroleum fields, natural gas production etc. It is tremendously dangerous to both environment and human beings. Therefore monitoring and controlling of H2S is very vital for the safety of human being and atmosphere. In nanotechnology era more attention is given to develop nanostructures metal- oxide semiconductors for various applications in day to day life. In that more importance is given to shape and morphology of particle. However it is not easy to control morphology as compared to particle size. Which required development of novel synthesis method or process to achieve the same and used for gas sensing. Practically it should be simple and cost effective method. On these considerations chemical methods are more suitable than physical process. Zinc oxide (ZnO) is a very fascinating material due to its versatile application generated by va...

$Research paper thumbnail of Super wideband fractal antenna for wireless communication$

2012 IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012

The self-similar fractal antenna has been shown to perturb the multi-frequency resonance into cou... more The self-similar fractal antenna has been shown to perturb the multi-frequency resonance into coupled resonance due to CPW feed. The fractal antenna found to be ultra-wideband and super-wideband in planar and monopole configuration respectively. The frequency independent nature of fractal antenna is useful in broad/wideband antenna design. This fractal antenna found promising the world of modern wireless communication systems based on open wireless platform using software defined radio.