VSR and NVR College

Tenali, India

VSR and NVR College

Tenali, India

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Madhavi D.,Jawaharlal Nehru Technological University Kakinada | Poornachandra Rao N.V.,VSR and NVR College
International Journal of Applied Engineering Research | Year: 2015

Present day wireless communication systems are in the Ultra Wide Band ranging 3.1-10.6 GHz. Two major advantages of this band is low power operation and wide band width that made this band very popular in recent times for short distance communication. It is necessary to investigate the response of the common materials used such as, bricks, walls, glass and so on for the propagation of these signals due to passage of these signals through these materials. This paper presents a method for the estimation of the dielectric constant, path loss and attenuation for the propagation of the UWB signals and presented the measured values from 3 to 4 GHz. © Research India Publications.


Govardhana Rao S.,St Marys Group Of Institutions Guntur | Madhu Mohan T.,Vasireddy Venkatadri Institute of Technology | Vijaya Krishna T.,Vasireddy Venkatadri Institute of Technology | Narendra K.,Rashtreeya Vidyalaya College of Engineering | Subba Rao B.,VSR and NVR College
Journal of Molecular Liquids | Year: 2015

Speed of sound (u), density (ρ) and refractive index (nD) values are measured for the binary mixture of 1-butyl-3-methylimidazolium tetrafluoroborate and N-methyl-2-pyrrolidinone over the entire range of mole fraction at temperatures from 298.15 to 323.15 K. Using the basic experimental data, isentropic compressibility (κs), intermolecular free length (Lf), molar volume (Vm), molar refraction (Rm) and excess isentropic compressibility (κsE), excess intermolecular free length (LfE), and excess molar volume (VmE) values are calculated. The calculated properties are discussed in terms of molecular interactions between the present investigated binary mixtures. The excess values are fitted to Redlich-Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. Further, the molecular interactions in the binary mixture system are analysed using the experimental FT-IR spectrum recorded at room temperature. © 2015 Elsevier B.V. All rights reserved.


Srinivasu J.V.,Sri Vishnu Engineering College for Women | Narendra K.,Rashtreeya Vidyalaya College of Engineering | Srinivasa Krishna T.,Rayalaseema University | Subba Rao B.,VSR and NVR College
Journal of Molecular Liquids | Year: 2016

Densities, ρ and speeds of sound, u of {1,4-butanediol (1,4BD) + methylpyridine isomers (α-, or β-picoline)} binary mixtures have been measured over the entire composition range at a temperature of (303.15, 308.15, 313.15 and 318.15) K, and at atmospheric pressure (0.1 MPa). The measured densities and speeds of sound data have been utilized to determine excess molar volumes, Vm E, excess isentropic compressibilities, κs E, excess molar isentropic compressibilities, κs, m E, excess speed of sound, uE and excess isobaric coefficient of thermal expansion αp Eof the investigated mixtures. Excess parameters were correlated by the Redlich-Kister polynomials. Excess partial molar volumes (Vm,1 EandVm,2 E) and their limiting values at infinite dilution (Vm,1 0E andVm,2 0E) have been calculated from the experimental density measurements and were analytically obtained using Redlich-Kister and Legendre polynomials. The deviation in Vm E were investigated by employing Prigogine-Flory-Patterson theory. © 2016 Elsevier B.V. All rights reserved.


Sunkara G.R.,St Marys Group Of Institutions Guntur | Tadavarthi M.M.,Vasireddy Venkatadri Institute of Technology | Tadekoru V.K.,Vasireddy Venkatadri Institute of Technology | Tadikonda S.K.,Nalanda Institute of Technology | Bezawada S.R.,VSR and NVR College
Journal of Chemical and Engineering Data | Year: 2015

Density , refractive index (nD), and speed of sound (u) values are measured for the binary mixture of 1-butyl-3-methylimidazolium tetrafluoroborate (1) and N-vinyl-2-pyrrolidinone (2) over the entire range of mole fractions at temperatures from T = (298.15 to 323.15) K under atmospheric pressure. Using the basic experimental data, various acoustic and thermodynamic parameters are calculated and are discussed in terms of molecular interactions between the present investigated binary system. The excess values are fitted to the Redlich-Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. Further, the molecular interactions in the binary mixture system are analyzed using the experimental FT-IR spectrum recorded at room temperature. © 2015 American Chemical Society.


Govardhana Rao S.,St Marys Group Of Institutions Guntur | Madhu Mohan T.,Vasireddy Venkatadri Institute of Technology | Vijaya Krishna T.,Vasireddy Venkatadri Institute of Technology | Subba Rao B.,VSR and NVR College
Journal of Chemical Thermodynamics | Year: 2016

Density (ρ), refractive index (nD) and speed of sound (u) values are measured for the binary mixture of 1-butyl-3-methylimidazolium tetrafluoroborate and 2-pyrrolidone over the entire range of mole fraction at temperatures from (298.15 to 323.15) K under atmospheric pressure. Using the basic experimental data, molar volume (Vm), isentropic compressibility (ks), intermolecular free length (Lf), molar refraction (Rm), excess molar volume (VmE), excess isentropic compressibility (κsE) and excess intermolecular free length (LfE) values are calculated. The calculated properties are discussed in terms of molecular interactions between the present investigated system. The excess values are fitted to Redlich-Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. Further, the molecular interactions in the binary mixture system are analysed using the experimental FT-IR spectrum recorded at room temperature. © 2015 Elsevier Ltd.


Suresh K.,P.A. College | Murthy K.V.R.,M. S. University of Baroda | Atchyutha Rao C.,P.A. College | Poornachandra Rao N.V.,VSR and NVR College | Subba Rao B.,VSR and NVR College
Journal of Luminescence | Year: 2013

The present paper reports the synthesis and Photoluminescence (PL) studies of the Eu and Gd rare earth ions, co-doped in Sr 2CeO 4 phosphor at different concentrations within the range from 0.1 to 2 mol% using inorganic materials like Strontium Carbonate (SrCO 3), Cerium Oxide (CeO 2), Europium Oxide (Eu 2O 3) and Gadolinium Oxides (Gd 2O 3). The samples were prepared by the conventional solid-state reaction method, which is the most suitable for large-scale production. The received phosphor samples were characterized using XRD, SEM, PL, TL, FTIR and CIE techniques. Undoped Sr 2CeO 4 exhibits good photoluminescence emission due to the charge transfer (CT) mechanism. The PL emission mainly concentrates around 467 nm, when excited with 254, 260, 280 and 350 nm wavelengths. The Sr 2CeO 4 phosphor, when co-doped with Eu and Gd, the PL emission was observed from 350 to 650 nm range, sharp peaks around 467, 478, 491, 500, 511, 538, 557, 569, 587, 601 and 617 nm with high intensity. From the XRD data, using the Scherers formula the calculated average crystallite size of undoped Sr 2CeO 4 is around 28 nm and co-doped with Eu, Gd is around 31 nm. Thermoluminescence (TL) studies were carried on all the phosphors under study. The present phosphor can act as single host for white light emission in compact fluorescent (CFL) and fluorescent lamps. © 2011 Elsevier B.V.


Neellma P.,Acharya Nagarjuna University | Cyril L.,Acharya Nagarjuna University | Kumar A.,VSR and NVR College | Rao N.G.,Acharya Nagarjuna University
Pollution Research | Year: 2011

Freshwater fish Cyprinus carpio were exposed to sub-lethal concentrations of synthetic pyrethroid, cypermethrin (25% EC) for 5,10 and 15 days. Biochemical parameters such as carbohydrate, protein and lipid content in gill, muscle and liver were studied. All biochemical parameters were found to decrease as a function of sublethal concentrations of pesticide cypermethrin was evidenced. Dose as well as exposure period depended statistically significant (P<0.05). Reduction in biochemical contents in gill, muscle and liver of Cyprinus carpio are advocated as bioindicators of water borne pesticide stress. Copyright © EM International.


Sreemannarayana C.,TJPS College | Gangadhara Rao A.,VSR and NVR College | Sarala Y.,KL UniversityAP
International Journal of Applied Engineering Research | Year: 2015

In this paper, the termssemiprimary ideal, semiprimary ternary semigroup and natural ordering in ternary semigroups are introduced.It is proved that in a ternary semigroup T,1) every left primary ideal is a semiprimary ideal, 2) every lateral primary ideal is a semiprimary ideal, 3) every right primary ideal is a semiprimary ideal. It is proved that if A is a semiprime ideal of a ternary semigroup T, then the following are equivalent 1) A is a prime ideal, 2) A is a primary ideal, 3) A is a left primary ideal, 4) A is a lateral primary ideal, 5) A is a right primary ideal and 6) A is a semiprimary ideal. Finally it is proved that a ternary semi group T is semiprimary if and only if prime ideals of T form a chain under set inclusion.If T is a semiprimary duo ternary semigroup, then globally idempotent principal ideals form a chain under set inclusion. It is proved that, if E is the set of all idempotent elements of ternary semigroup T. Then the natural ordering is a partial ordered relation, In a semiprimaryduo ternary semigroupt, the idempotents in T forms a chain under natural ordering. Further it is proved that, the principal ideals of ternary semigroup T form a chian iff ideals in T form a chain. It is proved that, If T is a regular duo ternary semigroup with identity, then i) every principal ideal of T generated by an idempotent, ii) principal ideals of T form a chain if and only if idempotents of T form a chain under natural ordering. Furter it is proved that, in a semisimple ternary semigroupthe following are equivalent1. Every ideal in T is a prime ideal.2. T is a primary ternary semigroup. 3. T is a left primary ternary semigroup.4. T is a lateral primary ternary semigroup. 5. T is a right primary ternary semigroup.6. T is a semiprimary ternary semigroup. 7. Prime ideals of T form a chain. Further it is proved that, In a semisimple duo ternary semigroup T with identity, then the following are equivalent.1. Every ideal in T is a prime ideal.2. T is a primary ternary semigroup.3. T is a left primary ternary semigroup.4. T is a lateral primary ternary semigroup.5. T is a right primary ternary semigroup.6. T is a semiprimary ternary semigroup.7. Prime ideals of T form a chain8. Ideals of T form a chain.9. Principle ideals of T form a chain.10. Idempotents of T forms a chain under natural ordering. Further it is proved that, Every ideal of a ternary semigroupT is prime if and only if T is semisimple primary ternary semigroup. It is also proved that, in a ternary semigroup T, the following are equivalent.1. Every ideal in T is a prime ideal. 2. T is a semisimple and ideals of T form a chain.3. T is a semisimple and prime ideals of T form a chain. Finally it is proved that, in a semisimpleduo ternary semigroup T, the following are equivalent.1. Every ideal in T is a prime ideal.2. T is a regular primary ternary semigroup.3. T is a regular semiprimary ternary semigroup.4. T is a regular ternary semigroup and idempotents of T form a chain under natural ordering. © Research India Publications.


Semigroups Bindu P.,Koneru Lakshmaiah College of Engineering | Sarala Y.,Koneru Lakshmaiah College of Engineering | Madhusudan Rao D.,Vsr And Nvr College | Gangadhara Rao A.,Vsr And Nvr College
International Journal of Applied Engineering Research | Year: 2015

This Paper deals with direct product of ternarysemigroups. The general properties and characteristics of complete rightideal of a ternarysemigroup. In this paper we have mainly proved that R be a complete rightideal of a ternarysemigroup T = ∏ iϵI Ti. Then Pi(R) is a complete rightideal of Ti and ∏iϵIPi(R) is a complete rightideal of Ti. © Research India Publications.


Lalitha G.,Kl Universityap | Sarala Y.,Kl Universityap | Madhusudhana Rao D.,VSR and NVR College | Bindu P.,Kl Universityap
International Journal of Applied Engineering Research | Year: 2015

The class of ternarysemigroups under the title includes the finitely generated commutative ternarysemigroups and noetherian commutative ternarysemigroups. We develop here some properties of noetherian ternarysemigroups related to primeideal structure. © Research India Publications.

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