Papers

Department of Physics, Bareilly College Bareilly  UP India

Email:-aksnmr@gmail.com

 The experimental values of NMR spin lattice relaxation time (T₁) of 2-aminopyridine, 3-Aminopyridine, 4-Aminopyridine, 2-Chloropyridine and 3-Bromopyridine have been reported. These values of T₁ have been correlated with the calculated values of T₁ obtained using various equations for dielectric relaxation time (t). This comparative study concludes that the values of dielectric relaxation time and NMR spin lattice relaxation time obtained using Murty equation are in better agreement with the experimental values. Experimental values of the mutual viscosity (n) of 2-aminopyridine, 3-Aminopyridine and 4-Aminopyridine have been also reported. It has been concluded that the mutual viscosity is a better substitute for the resistance to the rotation of the individual solute molecule. 
 

¹Regional Institute of Education, Bhubanessware India

²College of Basic Sciences and Humanities, Bhubaneswar India

 Heat and mass transfer in the magnetohydrodynamic flow of a visco-elastic fluid over an oscillating porous plate in a rotating frame with dissipation has been studied. After solving the constitutive equations of motion, energy and concentration by the use of complex functions, results have been discussed with the help of graphs and tables. It is observed that the velocity of flow increases with the non-Newtonian parameter (R_c) whereas the transverse component of the velocity of flow decreases with R_c. Magnetic parameter decelerates the flow. 
 

Department of Physics, T.D. Post Graduate College Jaun-UP India

Email:-ant_tdc@yahoo.com

A heavy rare-earth zirconate R₂Zr₂O₇ compound (where R = Y & Gd) was prepared by solid state reaction at 1300K for 50h. The prepared compound has been characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG). The XRD Studies indicates the formation of single phase orthorhombic structure at room temperature. The electrical conductivity of R₂Zr₂O₇compound were measured in the temperature range 300-1125 K at an internal frequency of 1 kHz. The logs vs. 10³/T plot yield the different slopes separated by break temperature (T₁). The activation energy below and above this break temperature have been estimated as approximately 0.10eV and 3eV respectively. Hence the electrical conduction below T₁ is essentially extrinsic always associated with impurities, defects and interstitials and conduction above T₁ is essentially intrinsic due to the change in conduction mechanism. 
 

Faculty of Science, K.N. Govt P.G.College Gyanpur S.R.N Bhadohi India

 The electrical conductivity (s) and Seebeck coefficient (S) of rare-earth nickelates of the type RNiO₃ with R = La, Ce and Pr are reported in the temperature range 400-1200K. These nickelates are perosskite type compounds with orthorhombic unit cell. It has been concluded that they are essentially electronic conductors and both the s and S variations with temperature (T) show three regions with break temperatures T₁ and T₂. The majority charge carriers are holes throughout the study. The conduction mechanism has been explained on the basis of energy band diagram. Energy band gap and mobility of charge carriers have also been evaluated.

Department of Physics, Tilak Dhari Post Grduate College Jaunpur India

Email:-ant_tdc@yahoo.com

The polycrystalline rare-earth metal zirconates Re₂Zr₂O₇, where Re = Y and Gd have been synthesized by the solid state reaction technique. The synthesis process was monitored by differential thermal analysis (DTA), thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG). The compounds were characterized through powder XRD. XRD patterns show them to be single phase orthorhombic structure at room temperature. The dielectric constant (e´) and dielectric loss (e") of the compounds have been measured at 1kHz in the temperature range 300 to 1125K. The log e´ vs T and log e´´ vs T plots of Y₂Zr₂O₇ and Gd₂Zr₂O₇ show rapid increase of dielectric constant and dielectric loss above 700K and 680K respectively. 
 

Biophysics Unit,Department of Physics ,Nizam college (Autonomous) Osmania Universiity Hyderabad India

This paper is concerned with the identification of inorganic constituent of human nail and crystallanity of human nail mineral and protein. The presence of inorganic material in human finger nail, whether it is of male or female, is scanty. The crystallanity, size distribution and preferential orientation of crystallite are ruled out. 
 

*(Ex) Department of Physics,G.S. P.G College Samodhpur, Jaunpur UP India

**Krishna Institute of Engg & Technology Ghaziabad U.P India

 We presented that all the properties of the Bosonic cases are applicable to the Fermionic path integral. One may extend the derivation to multiple Fermi oscillators and to field theory. Renormalisation theory reads in the same way as for Bosonic path integral. Fermionic path integrals satisfy cutting relations. Insertion of x(t) and (t) in the path integral again gives the corresponding operator in the matrix element, and multiple insertions are time ordered.

*Department of Physics, Saifia PG College of Science and Education Bhopal India

**Department of Physics, Barkatullah University Bhopal India

In the present paper we have investigated the elastic constant and Pressure Derivatives of mixed Deuterium Halides and are evaluated by using three-body interaction potential model which can predict Third order elastic constant (TOEC), Fourth order elastic constant (FOEC) and Pressure Derivatives of Second order elastic constant (SOEC) and Third order elastic constant (TOEC).Theoretical results are in good agreement with experimental data. Most of the physical properties like high pressure phase transition, cohesive energy and other properties of some ionic and partially covalent crystals are also obtained.

¹Assistant Professor, Department of Mathematics, Sri Venkateswara College of Engineering & Technology, Thirupachur tamil Nadu India

²Associate Professor in Statistics, St Joseph's College Trichy Tamil Nadu India

³Professor of Statistics(rtd), Annamalai University Annamalai Nagar Tamil Nadu India

Email:- statmaths80@gmail.com

 In inventory control there are many models based on the concepts of reliability theory. The concept of stations in series has been used to find the optimal quantity of semi finished products between two machines in series. This problem can be extended to the case of three machines in series and in such a case the reserve S₁ is the quantity of semi finished product generated by M₁ and S₂ stands for the quantity of semi finished product by M₂. In this paper the optimal size of the reserves S₁ and S₂ are obtained under the assumption that the break down duration of the first machine M₂ is a random variable distributed as first order statistic, similarly it is also distributed as n^th order statistic. 
 

^1,2,4Department of Electronics, D.D.U, Gorakhpur University,Gorakhpur India

³Department of Electronics and Communication Engineering, Suysh Institute of Technology, Gorakhpur India

¹Email:-mmanishm@yahoo.com

One of the most difficult problems to overcome when implementing FFT algorithm in fixed point arithmetic is that of word size enlargement. Here in this paper a novel scheme is proposed to overcome this problem using SD butterfly processor. The proposed SD butterfly processor can handle a word size of 64 bit without any overflow or data loss and at the same time maintaining accuracy of data at the output.