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Ranganayakulu K.,National Institute of Technology Warangal | Murthy N.Y.S.,Malla Reddy Engineering College
Journal of the Indian Chemical Society

The angular dependence of the C-H/C-D bond for a stabilization of the developing carbonium ion in the transition state of the solvolysis reaction of cycloalkyl halides has been investigated. This has been achieved by studying the rate of solvolysis of eight cyclic β-deuterated 1-alkyl-1-chloro cycloalkanes. Reaction rates for the solvolysis of both β-C-H and of the corresponding β-C-D compounds have been determined and the difference in the rate ratio i.e. k H/k D was attributed to the differential hyperconjugative effects exerted by β-hydrogens in different ring systems. By varying the ring size from C 5 to C 12 the dihedral angle of C-H bond in relation to the vacant "p" orbital on the trigonal carbon, (carbonium ion transition state) changes leading to changes in hyperconjugative stabilization of the intermediate carbonium ion with a consequent change in the rate of solvolysis. β-Deuterium isotope effects thus obtained for different cyclic systems were related with the actual bond angles between β-C-H bonds and the developing carbonium ions. Using the Allinger's force field calculations the best geometry for both the carbonium ions and the starting halo hydrocarbons were calculated. Source

Vattikuti S.V.P.,Yeungnam University | Byon C.,Yeungnam University | Chitturi V.,Malla Reddy Engineering College
Superlattices and Microstructures

Hexagonal WS2 platelets have been synthesized via simple hydrothermal synthesis method. The hexagonal WS2 is formed by the oriented attachment (OA)-self-assembly (SA). The thickness of the WS2 platelets was between ∼20 and 100 nm. The specific surface area of these platelets is 94.63 m2 g-1. The hexagonal WS2 platelets exhibited excellent photocatalytic activity compared to irregular WS2 platelets for the degradation of rhodamine B (RhB) under visible light irradiation. This work paves the method for designing hexagonal shaped WS2 platelets with great potential for a wide spectrum of applications in photocatalysis. Moreover, this synthetic procedure may open up an opportunity to tailor the morphologies of the other nanomaterials especially transition metal sulfides. © 2016 Elsevier Ltd. All rights reserved. Source

Ravindra Reddy B.,JNTUH College of Engineering | Phani Kumar N.,Malla Reddy Engineering College | Pattabhiramacharyulu N.C.,National Institute of Technology Warangal
ARPN Journal of Engineering and Applied Sciences

The present paper concerns with a model of two mutually interacting species with limited resources for first species and unlimited resources for second species. The model is characterized by a coupled system of first order non-linear ordinary differential equations. In this case, we have identified two equilibrium points and described their stability criteria. Solutions for the linearized perturbed equations are also found and explained their significance. Under the limited and unlimited resources for first and second species respectively, if the death rate is greater than the birth rate for both the species, it is found that there are two equilibrium points. The stability criteria for these equilibrium points are derived and further the solutions of the linearized perturbed equations are found and illustrated. © 2006-2011 Asian Research Publishing Network (ARPN). Source

Kumar N.P.,Malla Reddy Engineering College | Reddy B.R.,JNTUH College of Engineering | Ramacharyulu N.C.P.,National Institute of Technology Warangal
ARPN Journal of Engineering and Applied Sciences

In this paper a mathematical model of commensalism between two species (S 1 and S 2) with limited resources is investigated. The commensal species (S 1), in spite of the limitation of its natural resources flourishes drawing strength from the host species (S 2). This model is characterized by a pair of first order non-linear coupled differential equations. All the four equilibrium points of the model are identified and the criteria for the stability are discussed. The non-linear coupled system-equations are solved numerically by employing fourth order Runge-Kutta method and the results are presented. Further, some threshold results are stated. © 2006-2011 Asian Research Publishing Network (ARPN). Source

Basha R.H.,Kumamoto University | Aedla R.,Malla Reddy Engineering College | Torii S.,Kumamoto University
International Journal of Earth Sciences and Engineering

Geospatial technology can ensure optimum biomass resource sites for efficient renewable power generation. This software can help users to organise the geographic data and facilitate the selection of necessary data for a specific application. It has a feature to add layers of information to a basemap of real world locations hence creating a thematic map with geographical information system. This enables proper biomass characterization and determination of chemical composition of samples before and after pre-treatment. In this study a geospatial model was prepared which can map the various biomass resources based on its availability and location. The results obtained were recorded and stored in a database management system, which can be retrieved by other simulation software. © 2015 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved. Source

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