Papers

Journal of Ultra Scientist of Physical Sciences - A
Voulume: 34
Issue: 1
Article No. 1
The Motion of Strong Plane Shock Wave in Highly Viscous Medium
ARVIND KUMAR
Department of Physics, Daryao Singh Rathore Mem. Degree College, Budaun (U.P.) (India)
KAMLESH KUMAR
Department of Physics, Agra College Agra (U.P.)- 282002 (India)
Abstract :

Neglecting the effect of overtaking disturbances, the motion of strong plane shock wave in highly viscous medium has been investigated by Chester-Chisnell- Whitham method. The analytical expressions for shock strength decreases as shock advances for low viscous region of a medium to the high viscous region. The dependence of mach number on propagation distance, Pressure and Particle velocity as well as on adiabatic index has also been analyzed for the cases. The results obtained here are also compared Yadav et al. 2 for a freely propagating shock. The obtained expansions are computed and discussed through table

Keyword : : shock wave, CCW, method and viscosity
Paper Download Count : 158
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Article No. 2
Upconversion Luminescence Enhancement in Lanthanide Ions Doped Bismuth Tellurite Glasses
YOGESH K. JAYASWAL
Physics department, Madhyanchal professional university Bhopal M.P. (India)
GHIZAL F. ANSAR
Physics department, Madhyanchal professional university Bhopal M.P. (India)
, S. K. PATIDAR
Physics department, Madhyanchal professional university Bhopal M.P. (India)
, SUNIL JAT
Physics department, Govt. College Umarban, Dist. Dhar M.P. (India)
Abstract :

Lanthanide ions doped glasses are studied by researchers for upconversion luminescence. Rare earth doped bismuth tellurite glasses codoped with and without silver nanoparticle were synthesized by melt and quench procedure for the study of enhanced upconversion luminescence. Physical parameters as molar mass, molar volume, and density were evaluated. Amorphous nature of samples was verified by x-ray diffraction. DSC is carried for information of thermal properties. UV-Visible absorption and fluorescence spectra is obtained to get detail information of upconversion luminescence. Upconversion mechanism of rare earth erbium and ytterbium ions discussed. Three prominent upconversion luminescence is observed two in green region  and one is in red.

Keyword : Rare Earth Ions, upconversion, luminescence
Paper Download Count : 159
View Count : 213
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Article No. 3
Flow of Visco Elastic {Oldroyd (1958) Model} Liquid Through Porous Medium and the Annular Space Between two Right Circular Cylinders
Anil Tripathi
Department of Mathematics K.K.(P.G).College Etawah(U.P.)India
Abstract :

Present paper is concerned with the oscillatory motion of visco-elastic [Oldroyd  (1958) model] liquid through porous medium and the annular space between two right circular cylinders perpendicular to the flow of liquid when both the cylinders execute simple harmonic motion along the central axis of the cylinders. The amplitudes and frequencies have been taken different for both cylinders. The particular cases have also been discussed in detail. Thevelocity of visco-elastic liquid is effected by porous medium.

Keyword : porous medium, oscillatory, harmonically
Paper Download Count : 156
View Count : 221
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Article No. 4
Bianchi Type-I Inflationary Cosmological Models With Constant Deceleration Parameter For Perfect Fluid Distribution In General Relativity
Laxmi Lal Jat
Department of Mathematics & Statistics, UCOS, MLSU,Udaipur 313001,(India)
Atul Tyagi
Department of Mathematics & Statistics, UCOS, MLSU,Udaipur 313001,(India)
Barkha Rani Tripathi
Department of Mathematics,VidyaBhawanRural Institute,MLSU,Udaipur 313001, (India)
Abstract :

The models represent expanding and shearing universe and both models start with Big Bang initially and the expansion stops for large time. The spatial volume increases with time representing inflationary scenario. The shear is zero for large value of time representing isotropization of universe. The Hubble parameter determines the age of the universe. The expression for Hubble parameter matches with FRW model.

Keyword : Bianchi Type-I, Inflationary Universe, Perfect fluid, Cosmology
Paper Download Count : 171
View Count : 290
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