A STUDY ON USE OF FACEBOOK BY PG STUDENTS OF SELECTED DEPARTMENTS IN SRI RAMAKRISNA COLLEGE OF ARTS AND SCIENCE, COIMBATORE

The study on use of face book by students is a paper that represents a evaluation of more than one hundred studies on the social networking website face book. The paper focuses on face book use, which is currently the most researched theme the main studies for each group are presented, with an emphasis on the most influential ones in the field. The focus of this fictional examination is on the commonalities and difference that start from the results. As a result, one could notice that face book is mainly used to keep in touch with other people, but not in a conventional way as uses tend to spy on other users profiles this phenomenon leads to a growing exhibitionism, which is in turn related to individuals personality teats .use of face book is also influenced by peers and experience with the website

A STUDY ON USE OF FACEBOOK BY PG STUDENTS OF SELECTED DEPARTMENTS IN SRI RAMAKRISNA COLLEGE OF ARTS AND SCIENCE, COIMBATORE

The study on use of face book by students is a paper that represents a evaluation of more than one hundred studies on the social networking website face book. The paper focuses on face book use, which is currently the most researched theme the main studies for each group are presented, with an emphasis on the most influential ones in the field. The focus of this fictional examination is on the commonalities and difference that start from the results. As a result, one could notice that face book is mainly used to keep in touch with other people, but not in a conventional way as uses tend to spy on other users profiles this phenomenon leads to a growing exhibitionism, which is in turn related to individuals personality teats .use of face book is also influenced by peers and experience with the website

Augmented photocatalytic and electrochemical activities of Ag tailored LaCoO3 perovskite semiconductor

Inorganic perovskite materials have drawn significant interest in photocatalytic application owing to their excellent photo absorbing nature. In this regard, we have synthesized pristine and silver (Ag) modified lanthanum cobaltite (LaCoO3) perovskite by hydrothermal method and characterized by multitechnique approaches. The structural, absorption and emission studies reveal that addition of Ag influences the crystallite size, absorption co-efficient and electron hole recombination rate of LaCoO3. Morphological analysis shows that tetragonal morphology of the pure LaCoO3 is changed to square shape morphology on addition of Ag, which reveals the dispersion of Ag into LaCoO3. Electrochemical analysis demonstrates the possible electrochemical activity of the materials and confirms that Ag provides higher charge transfer kinetics and stability to LaCoO3. In addition, Ag-LaCoO3 degrades methylene blue (MB) in higher rate (99% in 10 min) compared to LaCoO3 (75% in 10 min). Mechanism behinds the photocatalytic activity has been discussed. Hence, the present investigation explores Ag modified LaCoO3 as a newpotential candidate for the application in photocatalytic activity under sunlight irradiation. (C) 2018 Elsevier B.V. All rights reserved

Optical characterization of YAl3(BO3)(4):Dy3+-Tm3+ phosphors under near UV excitation

Dy3+ and Tm3+ co-doped YAl3(BO3)(4) (YAB) phosphors were prepared by solid-state reaction method at 1200 degrees C/3 h. The average crystallite size was determined as 52.09 nm from the X-ray diffraction measurements. Upon 352 and 359 nm near ultra violet excitation, the YAB:Dy3+-Tm3+ phosphors exhibit Dy3+:F-4(9/2) --> H-6(J) = (J = 15/2, 13/2, 11/2) and Tm3+:D-1(2) --> F-3(4) transitions with different luminescence intensity. The photoluminescence emission and decay measurements revealed the energy transfer from Dy3+ to Tm3+ ions under 359 nm excitation only. The energy transfer between Dy3+ and Tm3+ takes place in Dy3+-Tm3+ clusters through exchange interaction mechanism. The Commission International de I'Eclairage chromaticity coordinates of YAB:Tm3+ phosphor (lambda(ex) = 359 nm) were found very close to the European Broadcasting Union and National Television Standard Committee illuminants. The emission color of the studied phosphors could be tuned from blue-to-white as a function of excitation wavelength. The YAB:Dy3+-Tm3+ phosphors can be used as potential candidates in display technology. (C) 2013 Elsevier B.V. All rights reserved

Influence of pH in La-doped SnO2 nanoparticles towards sensor applications

The present investigation has been carried out to optimize the pH level of lanthanum (La)-doped tin dioxide (SnO2) nanoparticles towards the potential application in gas sensor. The La-doped SnO2 nanoparticles were synthesized by sol-gel method in different pH values varying from acidic to base nature. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet (UV), photoluminescence (PL), and scanning electron microscopy (SEM) techniques. The XRD, UV, and PL analyses show the pH influences on the crystallite size of La-doped SnO2 nanoparticles. The SEM images show the formation of porous structure at pH 11. Also, the electrical conductivity of 1 mol% La-doped SnO2 at pH 3 and pH 11 were measured by impedance analyzer. In addition, we have fabricated and demonstrated device performance of synthesized La-doped SnO2 nanoparticles for gas-sensing application. Real-time current response and long-time response to the gas sensing were also studied for the fabricated device

Reinforced photocatalytic reduction of SnO2 nanoparticle by La incorporation for efficient photodegradation under visible light irradiation

In this era of technology, evolving and understanding the physicochemical properties of a novel photocatalytic material to degrade organic species in polluted water is most needed all over the globe due to environmental production. This study reports the influence of lanthanum (La) in physicochemical properties of tin (II) dioxide (SnO2) nanoparticles and its application towards methylene blue (MB) degradation under sunlight. The SnO2, 2mol% La incorporated SnO2 and 4mol% La incorporated SnO2 (4mol% La) nanoparticles were synthesized by simple co-precipitation method and characterized. X-ray diffraction patterns indicate higher angle shifts and peak broadening with respect to increase in La concentration. High-resolution transmission electron microscopic images (HR-TEM) reveal that SnO2 particle size decreases with respect to increase in La concentration. Morphological analysis shows that addition of La changes SnO2 morphology from agglomeration to segregated porous nature. Energy dispersive spectrum confirms the presence of parent and dopant elements in La incorporated SnO2 nanoparticles. UV-Visible spectrum indicates the increase in the band gap of La incorporated SnO2 due to the quantum size effect. The surface disorder, reduction in particle size and phonon confinement are identified from the Raman spectral analysis. Moreover, electrochemical analysis demonstrates the possible electrochemical activity of the materials as well as confirms that La provides higher charge transfer kinetics and stability to SnO2 nanoparticle. In addition, the calculated CBM potential confirms that La increases the redox potential of SnO2 nanoparticle, which is an ample condition to reduce O-2 as O-2(-). The fast MB degradation kinetics achieved by 4mol% La-SnO2 nanoparticle, which degrades 99% of MB within 60min under sunlight irradiation and exhibits more than 90% photodegradation efficiency up to ten recycle. A through study of possible photocatalytic mechanism for the photocatalytic degradation is discussed