Papers

¹Department of Mechanical Engineerin, K.L.University Vaddaeswaram India

²Department of Computer Science and Engineering, Nova College of Engineering and Technology,Ibrahimpatnam India

The effect of various flow entities which influence the flow rate when the bounding surface is subjected to sinusoidal disturbances has been studied in detail in this paper. It is notice that, for a constant time as the angle of inclination of fluid bed is increased, the flow rate decreases. Also, as the pore size of the fluid bed is increased, the flow rate decreases. Further, it is noticed that, the frequency of excitation of the fluid bed is found to have a profound effect on the flow rate. As the frequency of excitation is increased, the flow rate decreases. This is due to the fact that the fluid particles are trapped inside the pores of the fluid bed. It is further noticed that, over a period of time, initially the flow rate increases and thereafter it decreases and finally seems to converge. 
 

¹Research Scholar Department of Civil Engineering AMU Aligarh India

²M.Tech Scholar Department of Civil Engineering AMU Aligarh India

³M.Tech Scholar, Singhania University Jhunjhunu Rajasthan India

Email:- er.nadim@gmail.com

A dynamic model of the activated sludge process was used to analyze and optimize the operation of an SBR treating slaughterhouse wastewater. The existing treatment cycle (duration of fill, aeration, and mix, decanting and wasting periods) was found to be inadequate for meeting effluent requirements under a number of different loading scenarios. Modeling analysis indicated that the aeration phase was too long and the settling phase too short. Simulation of a new SBR cycle operation, in which the superfluous time in the aeration phase was distributed to the settling phase and a new anoxic phase, confirmed that the unit could meet the stringent effluent requirements. Using an iterative approach, optimal cycle settings were determined for each of the loading and temperature scenarios investigated. 
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¹Department of Basic Science,S.R.M.S College of Engg. & Tech Bareilly UP India

²Department of Physics, IIET, Invertis University, Bareilly UP India

³Department of Physics, Bareilly College , Bareilly UP India

In this paper, we focus our attention and deal with positron impact excitation of n=2 state of Helium from its ground state with the point of view of angular correlation parameter (g) at 50eV. To calculate this parameter, distorted wave approximation theory with different choices of distorted potential has been used. The result for 1¹S-2¹S transition is compared with available theoretical and experimental data. We found that these obtained results are quite sensitive to choice of distortion potential used. 

¹Department of Physics, IET Invertis University, Bareilly UP India

²Department of basic Sciences S.R.M.S College of Engg. & Tech, Bareilly UP India

³Department of Physics, Bareilly College bareilly UP India

Email:- kamleshsharma80@gmail.com

We have computed excitation cross section (ECS) of inert gas atom (Krypton) by impact of positron and electron using close coupling approximation method. High quality Hartree-Fock Slater orbitals are used to model the target wave function. We have already computed the excitation results^1,2 for inert gas atoms (Ne, Ar, Kr, and Xe) by positron as well as electron impact, but in this paper, we are presenting for Krypton atom only. Full orthogonalization significantly improves agreement with experimental data for the noble gas series. We have compared ECS results with other available theoretical results as well as experimental data. Our present results are found in excellent agreement with other calculations. However some discrepancies suggested that more theoretical as well as experimental work is required in future to improve the data. 
 

Department of Physics, T.D.P.G College jaunpur India

Email:- snstdcjnp@gmail.com

 The present theory is applied to describe shock waves in a gravitational field due to a heavy nucleus at the origin including the effects of radiative flux and an idealized azimuthal magnetic field, when the total energy of the disturbance is of increasing order. Singh^35,36 have considered a self-similar class of spherical gas dynamic disturbances in a gravitational field using the concept of Generalized Roche model into an in homogeneous ideal gas. We have given the results of our study for two different models; constant total energy of explosion and varying total energy of explosion with and without magnetic field are shown through the figure.
 

 
Department of Mathematics, University of Allahabad Allahabad UP India

.An analysis is carried out to study Natural convection heat and mass transfer flow over an inclined plate in porous medium. The fluid is assumed to be viscous incompressible and chemically reactive. Numerical calculations are carried out for different values of dimensionless parameters and an analysis of the results obtained shows that the flow field is influenced appreciably by the Prandtl number, Schmidt number, chemical reaction parameter, permeability parameter and angle of inclination. The governing boundary layer equations and boundary conditions are simplified by using similarity transformations. The governing equations are solved numerically by using BVP4C method. Numerical results for velocity temperature and concentration are shown graphically. 

Department of Physics and Electronics, Dr. R.M.L Avaddh University Faizabad UP INdia

Email:-sachida_shukla@yahoo.co.in

 A modified MOSFET based circuit of 'Complementary-Symmetry Class-B Push-Pull Amplifier' is proposed. The proposed amplifier circuit produces improved power amplification efficiency (PAE) to 65.2% and reduced harmonic distortion to 1.10%. Variation of maximum voltage gain as a function of biasing resistances is also observed. 
 

^*1DESM, Regional Institute of Education (NCERT), Bhubaneswar India

²Department of Physics, Orissa Engineering College, Bhubaneswar India

Email:- skdash59@yahoo.com

The mechanism of dipolar interaction involving the nuclear extractant TBP with five long-chain primary alcohols namely 1-butanol, 1-pentanol,1-hexanol,1-heptanol and 1-octanol was investigated using measured value of the relative permittivity at 455kHz , refractive index at sodium D-line and density at temperature 303.16K. The dielectric parameters such as excess mutual correlation factor and excess free energy of mixing were evaluated for entire range of concentration of TBP in these systems using Winkelmann-Quitzsch equation and Davis-Douheret equation. Striking similarities in the trend of variation of Dg and g_ab-1, DF_WQ and DF_DD were observed in 1-hexanol, 1-heptanol,1-octanol systems whereas it was opposite in others may be due to the limitations of W-Q and D-D equations. 
 

Department of Physics, T.D.P.G. College, Jaunpur UP India

Email:-ant_tdc@yahoo.com

 This paper reports the measurement of dielectric (K), electrical Conductivity (s) and Seebeck coefficient (S) of terbium orthochromite in the temperature range of 350 to 1000K. TbCrO₃ is a large dielectric constant material with K values of 316 at 10²Hz and 100 at 10³ Hz at 350K. The logK vs T plot is not smooth but shows anamolies at 446K and 755K, the latter has been interpreted as a phase transition of the material. Above 1000K the value of dielectric constant starts decreasing with temperature which is a typical characteristic of ferroelectric materials. The log sT vs T^-1 as well as S vs T^-1 plots show four distinct linear regions in the temperature intervals of 384- 444K, 444-714K, 800-1000K and 1000-1100K. The S values are positive and constant in these temperature intervals but log sT vs T^-1 plot has slopes of 0.34 eV, 0.48 eV, 0.73 eV and 0.73 eV in the four temperature ranges. It has been concluded that intrinsic band conduction is not the mechanism of electrical conductivity but it occurs due to hopping of electrons from Cr³⁺ to Cr⁴⁺ centres. These Cr⁴⁺ centres are created due to native defects. The number of these centres as well as the resulting Seebeck coefficient have also been calculated. The latter has a good agreement with the experimentally observed values. 
 

¹Department of Physics, Fatima Mata National College, Kollam-1 Kerala India

²Department of Physics, TKM College of Arts and  College, Kollam-5 Kerala India

Email:- cyphyp@rediffmail.com

In the present work, the vibrational wavenumbers of the title compound are calculated theoretically at different levels of theory and compared with the experimental results.