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Kavita Kumari,Akshay Kumar,MinJi Shin,Huh Seok Hwan,Bon Heun Koo 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The bimetallic nanoparticles as soft magnetic materials possess functional applications due to the low hysteresis losses, large saturation magnetization and high ferromagnetic character. Interestingly, these properties can be optimized in a number of ways. In this paper, the Fe30Co70 nanoparticles were prepared by reducing the precursors using sodium borohydride. The reaction time plays an important part in upgrading the properties of the material. The nanoparticles, prepared with the reaction times: 40min and 10min, were characterized using x-ray diffraction (XRD), low voltage field emission scanning electron microscopy (LV FESEM) and dc-magnetization. The effect of the reaction time was noticeably observed on the structural, morphological and magnetic properties of the nanoparticles. The XRD patterns confirm the formation of single-phase Fe30Co70 nanoparticles with crystallite size in nm range. The low crystallite size was observed for the low reaction time as determined using Scherrer’s formula. The LV FESEM micrographs revealed the spherical shape morphology of the nanoparticles for 10 min reaction time. The nanoparticles were found to form chain-like structures with a reaction time of 40 min. The enhanced ferromagnetic character was observed with the high saturation magnetization at low reaction time. The enhanced reaction time has been found to hamper the magnetic properties of Fe30Co70 magnetic nanoparticles. Thus, the exquisite properties of Fe30Co70 nanoparticles were observed at a reaction time of 10 min, however, they were suppressed as the reaction time was increased to 40 mins.
Effect of Zn and Mg doping on structural, dielectric and magnetic properties of tetragonal CuFe2O4
Kavita Verma,Ashwini Kumar,Dinesh Varshney 한국물리학회 2013 Current Applied Physics Vol.13 No.3
The Cu1=xAxFe2O4 (A = Zn, Mg; x = 0.0, 0.5) ferrites were successfully synthesized by chemical coprecipitation method. X-ray diffraction and Raman spectroscopy reveals that all the ferrite samples are in single-phase with tetragonal structure for CFO and cubic spinel structure for CZFO and CMFO samples. SEM micrograph shows the variation of grain size with Zn and Mg doping in parent CFO sample. Frequency dependent dielectric response confirms the dielectric polarization and electrical conduction mechanism in the present series with a maximum value of dielectric constant and loss tangent for CZFO sample. The anomaly w493 K in temperature dependent dielectric constant and dielectric loss is assigned to tetragonal to cubic phase transition in CFO sample. The magnetic measurement explored that the saturation value (Ms) is maximum for CZFO as compared to CFO and CMFO ferrites samples.
Effect of heat source and gravity on a fractional order fiber reinforced thermoelastic medium
Kavita Jain,Kapil Kumar Kalkal,Sunita Deswal 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.68 No.2
In this article, the theory of fractional order two temperature generalized thermoelasticity is employed to study the wave propagation in a fiber reinforced anisotropic thermoelastic half space in the presence of moving internal heat source. The whole space is assumed to be under the influence of gravity. The surface of the half-space is subjected to an inclined load. Laplace and Fourier transform techniques are employed to solve the problem. Expressions for different field variables in the physical domain are derived by the application of numerical inversion technique. Physical fields are presented graphically to study the effects of gravity and heat source. Effects of time, reinforcement, fractional parameter and inclination of load have also been reported. Results of some earlier workers have been deduced from the present analysis. 2010MSC: 74A15, 80A20.
A Novel Design of Bidirectional WDM-PON by using Mode Locked Laser and RSOA
Kavita Awade,Rajkumar Biradar 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.4
This paper presents Long Reach Wavelength Division Multiplexing Passive Optical Network (WDM-PON) system capable of delivering downstream 40 Gbit/s data and upstream 40 Gbit/s data on a single wavelength. The optical source for downstream data and upstream data is mode locked laser at central office and reflective semiconductor optical amplifier (RSOA) at each optical network unit. We use four RSOAs at each optical network unit for the 40-Gb/s upstream transmission. The operating wavelengths of these RSOAs are separated by the free-spectral range of the optical demultiplexer at the central office and remote node (RN) for demultiplexing the WDM channels. We extend the maximum reach of this WDM PON to be 117 km by using Erbium-doped fiber amplifiers at the RN. Bit error rate, were measured to demonstrate the proposed scheme. In this paper Long reach and large data service aspects of a WDM-PON is presented. The results show that the error-free transmission can be achieved for all WDM channels with sufficient power margins.
Adsorptive removal of fluoride from water samples using Azospirillum biofertilizer and lignite
Kavita Kulkarni,Gajanan M. Bhogale,Rujuta Nalawade 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.1
The present study involves a comparison of Azospirillum biofertilizer and lignite for removal of fluoride from aqueous solution. Batch experiments were performed to remove fluoride by the use of Azospirillum biofertilizer and lignite. Fluoride adsorption capacity was found by varying different parameters such as adsorbent dose, pH, initial concentration, temperature and contact time. The adsorption capacity for fluoride by using Azospirillum biofertilizer was 0.456mg/g and for lignite 0.16mg/g. Pseudo-second-order kinetic model best fit the experimental data. Field water samples were tested for fluoride removal by Azospirillum biofertilizer and lignite. The fluoride concentration was reduced to the permissible limit.
Feeding Longer Frames for Efficient Video Denoising Model
Kavita Arjun Bhosale,Sang-Hyo Park 한국정보과학회 2022 Journal of Computing Science and Engineering Vol.16 No.4
Recently, deep video denoising networks have shown substantially higher denoising performance with considerably lower computing times. However, due to the various characteristics of video motion, such models may not be able to denoise long-term frames. In this paper, we propose a method that takes longer input frames and feeds them to the existing architecture. In particular, the proposed method can effectively extract temporal information from frames that are dependent on each other over a long period of time. To demonstrate the performance of the proposed method, we implemented our method on the state-of-the-art video denoising model. Through the extensive experiments, the proposed method showed better performance in terms of quality metrics than the existing one, even with a higher noise level, resulting in considerably lower computing times.
Bioremediation of imidacloprid using Azospirillium biofertilizer and Rhizobium biofertilizer
Kavita Kulkarni,Aishwarya Chawan,Anand Kulkarni,Sandip Gharat 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10
Imidacloprid is a pesticide used for agricultural purposes. Residue of pesticide in water and soil will affect the water and soil quality. Seepage out of imidacloprid to the ecological system could affect aquatic life as well as human. The toxic pollutants would affect the quality of agriculture run off, in turn contaminating water bodies acting as sink for these runoffs. Hence, there is need for reparation of these pollutants. Azospirillium biofertilizer and Rhizobium biofertilizer were used as adsorbent for the removal of imidacloprid. These biofertilizers have capability to reduce the harmful component as well as be useful for plant growth. Azospirillium bacteria and Rhizobium bacteria are competent for the removal of organic pollutant from wastewater. These biofertilizers maintain biological activity without any adverse effect. The adsorptive removal of imidacloprid by using Azospirillium biofertilizer and Rhizobium biofertilizer was investigated at different conditions using batch experimentation. Optimization of parameters, such as dosage, time, temperature, pH, and agitation speed, was carried out. Equilibrium adsorption was illustrated by Langmuir and Freundlich isotherms. The kinetic data was best described by intraparticle diffusion and pseudo-second-order model. Reusability study showed good removal efficiency of imidacloprid after fourth use also. The investigations show that these materials have potential to be an excellent alternative for removal of pesticides while supporting plant growth.