Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

Vermiremediation of Urban and Agricultural Biomass Residues for Nutrient Recovery and Vermifertilizer Production

Abstract: Recovering the nutrients from organic solid residues is an ever demanding approach in terms of eco-friendly management. In this study, the efficiency of the earthworms, Perionyx ceylanensis and Perionyx excavatus in recycling and recovering plant nutrients from urban and agricultural biomass residues was investigated. Vermicomposting of four different types of organic biomass resources in combination with cowdung (1:1) for 50 days was conducted using the earthworms, P. ceylanensis, and P. excavatus. Physico-chemical, microbiological and maturity characteristics of the final product were analyzed. Results showed a decrease in pH, organic matter content (OMC), total organic carbon (TOC), cellulose, lignin, carbon to nitrogen (C/N) and carbon to phosphorus (C/P) ratios, and an increase in total Kjeldahl nitrogen (TKN), phosphorus (TP), potassium (TP), calcium and sodium in vermicomposts over composts (prepared without earthworms). TKN increase in vermicomposts over composts was insignificant between P. ceylanensis and P. excavatus, while it was significant for TP, TK, and total microbial population (P < 0.05). The reduction of TOC, OMC, C/N, and C/P ratios were significantly higher in vermicomposts recovered from P. ceylanensis than P. excavatus. The results clearly indicated that physico-chemical and microbiological changes are dependent on the nature of organic resources and earthworm species used. The seed germination tests with black gram and sorghum showed that the vermicomposts were mature and non-phytotoxic. P. ceylanensis is equally efficient in recovering nutrients from organic biomass residues to that of a widely used, P. excavatus. Therefore, both P. ceylanensis and P. excavatus are efficiently used for recovering nutrients from urban and agricultural biomass residues and for vermifertilizer production.

Certain Investigation on Visible Light Communication with OFDM Modulated White LED Using Optisystem Simulation

Abstract: Visible light communication (VLC) has drawn more attention in recent years. It is due to the reason that the existing light sources for lighting application in home, office and streets have huge amount of bandwidth and they can deliver data communication at higher bit rates. Orthogonal frequency division multiplexing (OFDM) modulation has also significant impact on communication sector now-a-days due to its healthiness to the signal distortion and support for higher data rate. In this paper we have studied the VLC system using Optisystem simulation tool for an already practically measured free space channel. White LED is used as source for our VLC system and it is driven by OFDM modulated signal. The arrangement of this system is analysed for various bit rates and link ranges. The proposed system can support 10 Gbps data rate up to 2 m link range. We have also studied the OFDM subcarrier impact on system performance and link range. The performance of designed system is compared based on its BER and constellation diagram.

Catalytic activity of Derris trifoliata stabilized gold and silver nanoparticles in the reduction of isomers of nitrophenol and azo violet

Abstract: Biosynthesized noble metal nanoparticles have different potential applications in the field of environment and biological science. Herein, we report the mechanism on the formation of gold and silver nanoparticles using the seed extract of Derris trifoliata (DT), a mangrove associate plant using LC-MS/MS and FTIR techniques. Influence of various parameters like concentration of the extract, duration of exposure to sunlight and pH in the synthesis were studied and optimized. Compared to the previous reports, silver nanoparticles synthesized by the present method exhibited high catalytic activity in the sodium borohydride (NaBH4) mediated reduction of position isomers of nitrophenol with an exceptional activity parameter 1744 s−1g − 1 for 4-nitrophenol. From the results, it could be concluded that the catalytic property of a nanoparticle depends on the structure of substrate to be reduced. Furthermore, catalytic reduction of a coloured pollutant, azo violet was also studied using the green synthesized gold and silver nanoparticles.

A pseudopotential approach to the superconducting state parameters of (Ni 33 Zr 67 ) 1−x M x (M=Ti, V, Co, Cu) ternary metallic glasses

Abstract: Superconductivity in ternary metallic glasses has been investigated using the model pseudopotential approach, which has been found quite successful in explaining superconductivity in metals, binary alloys and binary glasses. It is observed that this simple methodology successfully explains superconducting behaviour of ternary glasses without requiring the solution of Dirac equation for a many body problem or estimation of various interactions as required in ab-initio pseudopotential theory. In the present work superconducting state parameters of fourteen metallic glasses of (Ni-Zr)-M system (M=Ti, V, Co, Cu) have been determined in the BCS-Eliashberg-McMillan framework. It is observed that addition of V, Co, and Cu as the third element (M) to a binary metallic glass (Ni33 Zr67) causes the parameters λ,T c, α, andN 0 V to decrease, and Coulomb pseudopotential (μ*) to increase with concentration of M, showing that the presence of third element (M) causes suppression of superconducting behaviour of the alloy. The decrease inT c with increasing concentration of third element (M) may be attributed to the modifications in density of states at the Fermi levelN(E F), and probable changes in the band structure of the alloy due to addition of the third element (M). Slight difference is noticed when Ti is added to the Ni33 Zr67 alloy. In this caseT c rises initially and then decreases with concentration of M, showing a peak at aboutx=0.05. This indicates that on addition of Ti, 3d states grow near the Fermi level and hence contribute substantially toN(E F), favouring superconducting behaviour in this case. The present results forT c show an excellent agreement with the experimental data. QuadraticT c equations have been proposed, which provide successfully theT c values of ternary metallic glasses under consideration.