Thapar University

About: Thapar University is a education organization based out in Patiāla, Punjab, India. It is known for research contribution in the topics: Cloud computing & Fuzzy logic. The organization has 2944 authors who have published 8558 publications receiving 130392 citations.

Transition metal doped TiO2 mediated photocatalytic degradation of anti-inflammatory drug under solar irradiations

Abstract: Bismuth (Bi) and Nickel (Ni) Doped Titanium Dioxide (TiO2) nanoparticles were synthesized by sol–gel method and the prepared nanoparticles were characterized by X-Ray Diffraction, Scanning Electron Microscope, UV–vis reflectance spectroscopy and Brunauer–Emmett–Teller (BET) analysis. The concentration of dopant in synthesized catalysts was varied from 0.25 to 1.0 wt%. Maximum BET surface area of 47.8 and 45.7 m2/g was observed with 0.25 wt% Bi–TiO2 and 0.5 wt% Ni–TiO2, respectively. EDX analysis has established the presence of 0.21% Bi ions and 0.36% Ni ions in 0.25 wt% Bi doped TiO2 and 0.5 wt% Ni doped TiO2, respectively. Band gap of Bi–TiO2 (0.25 wt%) and Ni–TiO2 (0.5 wt%) was obtained to be 2.99 eV, which is found to be minimum among the various synthesized catalysts. The photocatalytic activity of synthesized catalysts were tested and compared with Degussa TiO2 for degradation of Ibuprofen (IBP) as a model compound. Bi–TiO2 nanoparticles revealed higher photocatalytic activity when compared to Ni–TiO2 or Degussa TiO2 under solar irradiation, which may be attributed to increase in specific surface area, and decrease in the crystallite size. Maximum of 89% degradation was achieved with 0.25% Bi–TiO2 photocatalyst under 6 h of illuminations with a solar light, whereas, 78% degradation has been achieved under similar experimental condition with Ni doped TiO2. The kinetics of the degradation of IBP has been explained in terms of the Langmuir–Hinshelwood model and was found to follow first order kinetics with k value of 0.0064 and 0.0046 min−1 with Bi and Ni doped TiO2, respectively.

A secure authentication scheme with anonymity for session initiation protocol using elliptic curve cryptography

Abstract: As a signaling protocol for controlling communication on the internet, establishing, maintaining, and terminating the sessions, the Session Initiation Protocol (SIP) is widely used in the world of multimedia communication. To ensure communication security, many authentication schemes for the SIP have been proposed. However, those schemes cannot ensure user privacy since they cannot provide user anonymity. To overcome weaknesses in those authentication schemes with anonymity for SIP, we propose an authentication scheme with anonymity using elliptic curve cryptograph. By a sophisticated analysis of the security of the proposed protocol, we show that the proposed scheme not only overcomes weaknesses in previous schemes but also is very efficient. Therefore, it is suitable for applications with higher security requirements.