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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 | Year: 2011

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).


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 | Year: 2011

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).


Vattikuti S.V.P.,Yeungnam University | Byon C.,Yeungnam University | Chitturi V.,Malla Reddy Engineering College
Superlattices and Microstructures | Year: 2016

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.


Ranganayakulu K.,National Institute of Technology Warangal | Murthy N.Y.S.,Malla Reddy Engineering College
Journal of the Indian Chemical Society | Year: 2011

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.


Bose B.,Malla Reddy Engineering College | Sane S.S.,Veermata Jijabai Technological Institute
ICWET 2010 - International Conference and Workshop on Emerging Trends in Technology 2010, Conference Proceedings | Year: 2010

Advancements in communication technologies have given rise to Mobile Database Systems (MDS). MDS allows a mobile user to initiate transactions from anywhere and at any time and guarantees their consistency preserving execution. Transaction processing in MDS has been suggested by modifying the traditional two and three phase commit (2PC) to accommodate the limitations of a Mobile Host and wireless network like intermitted connectivity, limited power, limited memory etc. A timeout based approach "Transaction Commit on Timeout", TCOT, has been suggested which shows better performance compared to 2PC and 3PC. However, this scheme does not explicitly consider a distributed database system. We propose a scheme Distributed Transaction Commit on Timeout, DTCOT, to commit the transaction in a MDS environment with distributed database. This scheme uses a timeout to decide a commit or abort. DTCOT requires two coordinators: - one for coordinating the entire transaction execution and one, which acts as the interface to the distributed database (i.e. database coordinator). The database coordinator is required because data distribution must be transparent the end user (i.e. transaction coordinator). This is a one-phase protocol due to which the time and message complexity are much lower compared to the conventional 2 phases commit and 3 phase commit protocols. We will compare the performance with the modified 2PC and show that it performs better w.r.t. Message and time complexity. Copyright 2010 ACM.


Nagaraju M.,BioMax | Ramulla S.,Malla Reddy Engineering College | Murthy N.Y.S.,Malla Reddy Engineering College
Asian Journal of Chemistry | Year: 2011

Extraction of aloin from the plant Aloe barbadensis Miller has been accomplished by a sequence of steps. Preliminary investigations like TLC, UV-Vis assay, nitrogen content, moisture content, ash content were carried out. The results are tabulated and a comparison of the results obtained with soil grown plant and in vitro cultured plant were also presented.


Nagaraju M.,BioMax | Ramulla S.,Malla Reddy Engineering College | Murthy N.Y.S.,Malla Reddy Engineering College
Asian Journal of Chemistry | Year: 2011

Biogas is an alternate of fuel produced by the action of various groups of anaerobic bacteria on biomass, manure, sewage, municipal waste and green waste. It useful for cooking and for electricity production. Production of biogas and alcohol from the rind of Aloe barbadensis Miller is presented in this communication.


Rao B.S.,Malla Reddy Engineering College | Prasad S.D.V.,Malla Reddy Engineering College
Communications in Computer and Information Science | Year: 2011

In the present research work an attempt has been made to design and implement a tamper detection scheme that provides an additional procedure which detects tampering, given two signatures, whether one of them was generated by the forger. In this system, emails and files are signed digitally. The scheme automatically computes a hash based on the exact content of the email message, and then encrypts the value with the sender's private key. The recipient of the email will use their tamper evidence software to compute the same calculation. The matching of the calculation with the hash value is a proof that the message has not been altered. It ensures the data integrity, confidentiality and authentication. © 2011 Springer-Verlag.


Rao B.S.,Malla Reddy Engineering College | Rani M.R.,Malla Reddy Engineering College | Prasad S.D.V.,Malla Reddy Engineering College
AIP Conference Proceedings | Year: 2013

In this research work, we present a computer simulation study of effects of three-body interactions (TBI) on Schottky defect properties of some transition metal oxides (TMO). The calculations have been done in the framework of polarizable point ion (PPI) model and using the three-body interaction potential (TBP). The computed cohesive and schottky formation energy are in good agreement with the experimental data and emphasize the significance of TBI. © 2013 AIP Publishing LLC.


Tallapally S.,Malla Reddy Engineering College
Information Technology and Control | Year: 2012

In the field of cryptography, the three-party authenticated key exchange protocol is an important tool, especially in the secure communication areas. In this protocol, two clients share a human-memorable password with a trusted server whereby the two clients receive a secure session key. Most recently, Huang proposed a simple and efficient three party password-based key exchange protocol. She claimed that the proposed protocol is secure against various attacks. However, Yoon and Yoo proved an undetectable online password guessing attack on Huang's protocol. In the present paper, an unknown key share attack on Huang's three party PAKE protocol using undetectable online password guessing attack is demonstrated. Additionally, an alternative protocol that eliminates this attack is proposed. Moreover, the proposed protocol requires only four message transmission rounds.

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