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RISS 인기검색어
- 검색키워드
- 저자 : Jitendra Agrawal (검색결과 4 건)
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Jitendra Pal Singh,R.C. Srivastava,H.M. Agrawal,Prem Chand,Ravi Kumar 한국물리학회 2011 Current Applied Physics Vol.11 No.3
The present investigation aims to study the swift heavy ion irradiation induced effects in zinc ferrite nanoparticles through X-ray diffractometry, transmission electron microscopy and electron paramagnetic resonance spectroscopy. A series of zinc ferrite nanoparticles having different crystallite sizes ranging from 12 to 62 nm have been synthesized by using the nitrates of cations and the citric acid as the host. These samples were irradiated by 100 MeV oxygen beam with two fluences 1 × 10^13 and 5 × 10^13 ions/cm^2. The XRD patterns show the deterioration of crystalline phase after irradiation. The average crystallite size decreases after irradiation. EPR analyses of the pristine and irradiated samples show that the changes depend on the average crystallite size of the pristine samples. Further, the pristine sample having a crystallite size of 62 nm passes through dominant changes after irradiation. It was observed that the number of magnetic centres decreases in the irradiated samples.
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Antibacterial Properties of Silver Doped TiO2 Nanoparticles Synthesized via Sol-Gel Technique
Jitendra Bahadur,Shraddha Agrawal,Vinay Panwar,Azra Parveen,Kaushik Pal 한국고분자학회 2016 Macromolecular Research Vol.24 No.6
In this work, antibacterial, micro-structural, and fluorescence properties of silver (Ag) doped TiO2 nanoparticles were studied to analyze the effect of silver for effective improvement in antibacterial properties of TiO2. Antibacterial properties of pure TiO2 and Ag-TiO2 was studied using Escherichia coli, Pseudomonas aeruginosa as Gram Negative and Bacillus subtilis, Staphylococcus aureus as Gram positive bacteria, as a model for Agar disc diffusion assay method. The concept of inhibition zone diameter was applied to observe the antibacterial activity of TiO2 and Ag-TiO2. It was observed that the antibacterial activity of TiO2 improves with doping of Ag. Fluorescence spectra confirm the red shift in band edge emission at excitation wavelength of 360 nm which shows effective fluorescence properties of these nanoparticles. Microstructures of these nanoparticles have studied with the help of transmission electron microscopy (TEM) and atomic force microscopy (AFM).
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Consequences of electronic excitations in CoFe1.90Dy0.10O4
Hemaunt Kumar,Jitendra Pal Singh,R.C. Srivastava,P. Negi,H.M. Agrawal,Kandasami Asokan,원성옥,채근화 한국물리학회 2015 Current Applied Physics Vol.15 No.12
Present work reports the irradiation induced effects in Dy3þ doped cobalt ferrite nanoparticles in the regime of dominant electronic excitation processes induced by 100 MeV O7þ ion irradiation. Irradiation leads to the deterioration of crystalline phase as envisaged by X-ray diffraction. Crystallite size decreases with the increase of irradiation fluence. Disappearance of certain bands in Raman spectra at higher fluence of irradiation confirms the crystalline disorder induced by electronic excitations. Fourier transform infrared spectra show onset of cation migration from tetrahedral site to octahedral site and vice versa. X-ray absorption fine structure measurements depict the preservation of valence state of metal ions after irradiation. These measurements further infer bond breaking process in irradiated materials. Magnetic measurements carried out on these materials indicate slight increase of saturation magnetization at room temperature followed by the decrease of coercive field. Obtained results are discussed on the basis of appropriate mechanism.
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Data Protection in Clouds using Two Stage Encryption
Pallav Sharma,Varsha Sharma,Sanjeev Sharma,Jitendra Agrawal 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4
Cloud Computing has been an emergent technology that has opened the space for virtualization, as it provides many computational services and storage services over the Internet with the help of a browser. Cloud computing’s core comprises of services like platform, infrastructure and software as a service. The unpredicted boom in cloud computing is driven by its simple economic benefit. It helps in reducing capital expenses and minimizes operating expenses. This move however, has increased a major concern about the protection of data, as against the traditional system the data is now stored online and is far easily exposed than we realize. This raises a major security issue for data protection. Many techniques for protection of data have been proposed so far. However, the best available option till date is to encrypt user data before storing it over the cloud environment and decrypting it again before handing the data back to the cloud user. In this paper, we introduce a more efficient and stronger encryption process that allows a cloud service provider to protect user data more efficiently.
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