Gayathri Pavani | Jntu College Of Engineering, Hyderabad (original) (raw)

Uploads

Papers by Gayathri Pavani

Credit card fraud and identity theft are deliberate threats addressed by consumers and industries... more Credit card fraud and identity theft are deliberate threats addressed by consumers and industries. It is the challenging issue that is being encountered to safeguard and protect financial data and personal information from criminal activity.Quantum-Secure Authentication is an innovative method that is helping in resolving this problem. It utilizes the unique quantum property of a light to create a secure question and answer exchange that cannot be spoofed. The article outlines the review of how one can restrict the unauthorized access utilizing the Quantum cryptography security model.

Materials Research Bulletin, 2012

ABSTRACT xTeO2 + (70 − x)B2O3 + 5TiO2 + 24R2O:1CuO (x = 10, 35 and 60; R = Li, Na and K) glass sy... more ABSTRACT xTeO2 + (70 − x)B2O3 + 5TiO2 + 24R2O:1CuO (x = 10, 35 and 60; R = Li, Na and K) glass system were studied by spectroscopic techniques such as ESR, optical absorption, Raman and IR. From ESR spectra, the spin Hamiltonian parameter values indicate that the ground state of Cu2+ is dx2−y2dx2−y2 and the site symmetry around the Cu2+ ion is tetragonally distorted octahedral coordination. Bonding parameters calculated from optical absorption and ESR data are found to change with alkali oxide and TeO2 content. Bonding parameters indicate a slight covalency for the in-plane σ bonding as compared to in-plane and out-of-plane π bonds. Both Raman and IR results show that glass network consists of TeO3, TeO4, BO3, BO4 and RiO4 group as basic structural groups. BO3–BO4− ring structure interconnected by TeO3− and TeO4− groups, where the BO4− groups are neighbors of the TeO3− groups. BO3 → BO4 transition is also observed, which correlates with the transition of TeO4 → TeO3 via TeO3+1.

Physica B: Condensed Matter, 2011

... [26] Dariush Souri, Middle-East Journal of Scientific Research 5 (1) (2010) 44. ... Rahim Sah... more ... [26] Dariush Souri, Middle-East Journal of Scientific Research 5 (1) (2010) 44. ... Rahim Sahar and Sulhadi Solid State Science and Technology, 15(1) (2007) 122-126 14 [31] ME Zayas, H.Arizpe, SJ Castillo, F. Medrano, GC Diaz, JM Rincon, M. Romero, FJ Espinoza Beltran. ...

Optical Materials, 2011

... P. Gayathri Pavani Corresponding Author Contact Information , E-mail The Corresponding Author... more ... P. Gayathri Pavani Corresponding Author Contact Information , E-mail The Corresponding Author , S. Suresh, V. Chandra Mouli. Glassy Material Research Laboratory, Department of Physics, Osmania University, Hyderabad 500 007, India. ...

Optical Materials, 2013

Raman and infrared spectroscopies have been employed to investigate the xLi 2 O-(40 À x)Bi 2 O 3-... more Raman and infrared spectroscopies have been employed to investigate the xLi 2 O-(40 À x)Bi 2 O 3-20CdO-40B 2 O 3 glasses in order to obtain information about the competitive role of Bi 2 O 3 and B 2 O 3 in the formation of glass network. IR and Raman spectra show that these glasses are made up of [BO 3 ], [BO 4 ] and [BiO 3 ] pyramidal and [BiO 6 ] octahedral units. The formation of CdO 4 in tetrahedral coordination was not observed. The optical absorption studies revealed that the cutoff wavelength decreases while optical band gap energy (E opt) increases. The average electronic polarizability of the oxide ion (a O 2À), optical basicity K(E opt), and Yamashita-Kurosawa's interaction parameter A(E opt) were also examined.

Journal of the Korean Physical Society, 2013

ABSTRACT Titanium boro tellurite glasses in the xB2O3−(90−x) TeO2 − 10TiO2 (where x = 0 to 50 mol... more ABSTRACT Titanium boro tellurite glasses in the xB2O3−(90−x) TeO2 − 10TiO2 (where x = 0 to 50 mol%) system were prepared by using the conventional melt-quenching technique. Glass transition temperatures were measured with differential scanning calorimetry (DSC) and found to be in the range of 300–370 °C. The Raman spectra showed a cleavage of the continuous TeO4 (tbp) network by breaking of the Te-O-Te linkages. The relative transition of TeO4− groups to TeO3− groups is accompanied by a change in the oxygen coordination of the boron from 3 to 4 (BO3− to BO4−). The impedance plots Z″(ω) versus Z′(ω) for all the glass samples were recorded and found to exhibit a single circle. The AC conductivity of all glass samples was studied in the frequency range from 100 Hz to 1 MHz and in the temperature range from room temperature (RT) to 375 °C. The AC conductivity decreased by about one order in magnitude with increasing B2O3 content. The conductivity was found to be on the order of 10−4.5 to 10−6 (Ωcm)−1 at 375 °C and 1 MHz for 10 mol% and 50 mol% B2O3 contents, respectively. The relaxation behavior in these glass samples is discussed based on the complex modulus and impedance data.

Journal of Alloys and Compounds, 2012

Physical, optical absorption, ESR and DSC studies on 50 B 2 O 3-(50 − x) CdO-xTeO 2 glasses conta... more Physical, optical absorption, ESR and DSC studies on 50 B 2 O 3-(50 − x) CdO-xTeO 2 glasses containing Cu 2+ spin probe have been carried out. Density measurement is carried out by Archimedes principle. Variation in glass transition temperature is discussed in terms of physical parameters. ESR results show that g > g ⊥ indicating that the Cu 2+ ions is in tetragonal distorted octahedral site and its ground state is d x 2 −y 2. There are considerable changes in g , g ⊥ and A values with increasing the concentration of CdO in BCT glass systems. The optical absorption spectra results show that the absorption peak of Cu 2+ is a function of composition. The observed optical absorption peak of Cu 2+ has been found to be minimum at 776 nm for x = 30 mol.% of CdO content. The variations in the physical, optical and bonding parameters clearly indicate the structural changes in the present glass system with varied CdO content.