University of Rajasthan

About: University of Rajasthan is a education organization based out in Jaipur, India. It is known for research contribution in the topics: Chemical shift & Derivative (chemistry). The organization has 15058 authors who have published 15733 publications receiving 117400 citations. The organization is also known as: Rajasthan University.

MHD Flow with Slip Effects and Temperature-dependent Heat Source in a Viscous Incompressible Fluid Confined between a Long Vertical Wavy Wall and a Parallel Flat Wall

Abstract: This study examines the problem of an MHD free convection flow in the presence of a temperaturedependent heat source in a viscous incompressible fluid between a long vertical wavy wall and a parallel flat wall with constant heatflux and slip flow boundary condition. A uniform magnetic field is assumed to be applied perpendicular to the walls. It is assumed that the flow consists of two parts; amean part and aperturbedpart. Expressions for the zeroth-order and first-order velocity, temperature, skin friction, and Nusselt number at the wal lr ;ire obtained. The effects of different parameters entering into the problem, viz., free convection parameter, magnetic parameter, and heat source parameter on the zeroth-order and first-order velocity fields, temperature field, skin friction, and Nusselt number at the walls are shown graphically and discussed numerically,

Particle identification in ALICE: a Bayesian approach

Abstract: We present a Bayesian approach to particle identification (PID) within the ALICE experiment. The aim is to more effectively combine the particle identification capabilities of its various detectors. After a brief explanation of the adopted methodology and formalism, the performance of the Bayesian PID approach for charged pions, kaons and protons in the central barrel of ALICE is studied. PID is performed via measurements of specific energy loss (dE/dx) and time of flight. PID efficiencies and misidentification probabilities are extracted and compared with Monte Carlo simulations using high-purity samples of identified particles in the decay channels K-S(0) -> pi(-)pi(+), phi -> K-K+, and A -> p pi(-) in p-Pb collisions at root sNN = 5.02 TeV. In order to thoroughly assess the validity of the Bayesian approach, this methodology was used to obtain corrected p(T) spectra of pions, kaons, protons, and D-0 mesons in pp collisions at root s = 7TeV. In all cases, the results using Bayesian PID were found to be consistent with previous measurements performed by ALICE using a standard PID approach. For the measurement of D-0 -> K-pi(+), it was found that a Bayesian PID approach gave a higher signal-to-background ratio and a similar or larger statistical significance when compared with standard PID selections, despite a reduced identification efficiency. Finally, we present an exploratory study of the measurement of A(c)(+) -> pK(-)pi(+) in pp collisions at root s = 7TeV, using the Bayesian approach for the identification of its decay products.

Cobalt doped ZnS nanoparticles as a recyclable catalyst for solvent-free synthesis of heterocyclic privileged medicinal scaffolds under infrared irradiation

Abstract: This paper reports preparation and characterization of cobalt doped ZnS NPs and their catalytic application in the synthesis of heterocyclic privileged medicinal scaffolds involving pyrazolones (with excellent regioselectivity) and 1,3-oxathiolan-5-one frameworks under infrared irradiation. Nanoparticles have been prepared at room temperature by a wet chemical method. The heterogeneous catalysts were fully characterized by XRD, TEM, EDAX, ICP-AES and UV/Vis. Under infrared radiation (IR), the catalytic activity of Co doped ZnS NPs was about 40-fold higher under IR as compared to the conventional method. Nanocatalyst plays a dual role of catalyst as well as susceptor, and enhances the overall capacity to absorb IR in the reaction mixture. Doping by Co promotes the activity and selectivity of ZnS NPs as indicated by their high TOF value, providing the products with good to excellent yields. The surface acidity of NPs was measured by FTIR spectra of chemisorbed pyridine. The present method does not involve any hazardous organic solvent or catalyst. The introduction of nanocatalyst in an IR system offers promising features for the reaction response such as the shorter reaction time, simple work-up procedure, and purification of products by non-chromatographic methods. The catalyst was reused up to four runs without an appreciable loss of catalytic activity.