Papers

1Department of Physics, Jatani College, Jatani Khurda India

2Department of Physics, Nayagarh Autonomous College, Nayagarh India

³Plot No 193, Jayadeva Vihar, Bhubaneswar India

Email:-dr.sadasivabiswal@ymail.com

 Effects of heat and mass transfer on MHD free convection, flow of a visco-elastico (Walters' ) fluid past an exponentially accelerated vertical porous plate have been studied. The problem is formulated with the development of the constitutive equations of continuity, momentum, energy and concentration. Solving the equations by Laplace transform technique, expressions for velocity, temperature and concentration are obtained. With the numerical values of the fluid parameters, computation is preformed and necessary graphs and tables are drawn to unveil the characteristics of velocity field, temperature field and concentration. Then expressions for shear stresses, rate of heat transfer and concentration gradient are obtained. It is observed that the velocity of flow increases with the distance from the plate for an externally cooled plate (G>0) and a reverse effect is marked for an externally heated plate (G<0). The temperature and concentration decreases with the increase of Prandtl number (P) and Schmidt number (S_c) respectively. 
 

Microwave Tubes Division,Central Electronics Engineering Research Institute (CSIR) Pilani Rajasthan India

Email:-ghoshsk@rediffmail.com

Travelling wave tubes (TWTs) are power amplifier for communication satellite. The electron gun plays a significant role in determining the life and reliability of a TWT. For long life and reliable TWT, a cathode needs to be operated at lower temperature, and, hence, proper heat shielding from cathode is important. To avoid heat drainage from cathode, cathode is shielded with tantalum heat shields. A three dimensional thermal and structural analysis of electron gun is being carried out using finite element analysis (FEA) code COSMOS. The thickness and material property of cathode heat shield is a critical parameter and are presented here. Moreover, expansion of cathode, beam focus electrode (BFE) and anode in both axial and radial directions are also studied due to temperature distribution. Also a frequency analysis of electron gun assembly has also been carried out.

Department of Physics,G.S.P.G College Samodhpur UP India

 We have presented the singularity that may possibly form during the collapse, at the centre. We have discussed the nature of singularities in Husain solution. We have presented that under certain conditions of mass function, strong curvature naked singularities exist in spherically symmetric Husain solution. Even though in non-spherical cases, there are many examples of naked singularities. We have also presented that non-spherical Husain solution also admits a naked singularity in special case, but in general it proceeds to form a black hole.

*Head (LU&USD), Remote Sensing Application Centre, MP Council of Science & Technology, Vigyan Bhawan, Nehru Nagar, Bhopal India

**Project Associate (LU& USD), Remote Sensing Application Centre, MP Council of Science & Technology, Vigyan Bhawan, Nehru Nagar, Bhopal India

 Bhimbetka known for its rock painting, rock shelters & caves were the earliest traces of human life in India were found. The shelters & paintings created by the pre-historic man are as early as 9000 year old. The Bhimbetka is the oldest site in the world where petroglyphs were found. The area has full of natural resources, rich in forest & fauna and all of this makes this area as real site of tourism and adventure. The study area is in Obaidullhaganj Tehsil of Raisen District, M.P., India covering an area of 300 sq.km., is 47 kms from Bhopal on Jabalpur Highway NH-12. The area is surrounded by north fringe of Vindhyans Mountains and covered with huge rocks. Recent discoveries of over 700 hundred rock shelters have brought Bhimbetka on world map. Bhimbetka inscribes as world heritage site by UNESCO in 2004. The site is broadly divided into Core and Buffer area were 243 rock paintings and rock shelters belongs to Bhimbetka group in core area and 178 in Lakha Juar group. The rock shelters, paintings and caves have to be protected and these pre-historic site need to be conserve ecological and environmentally. Remote Sensing and GIS can be effectively used for Archeological applications for preparation of Management Plan for heritage sites. The study has been carried out in collaboration with Archeological Survey of India (ASI), Bhopal Circle with an objective to promote tourism in Bhimbetka area. An attempt has been made using high resolution satellite data (IRS 1D + PAN merged) in conjunction with ground information to map the natural and physical setting of Bhimbetka site to suggest meaningful plan for promotion of tourism and management of natural resources and also to conserve the area ecologically. The recommendation suggested can also be applied for other archeological sites of Madhya Pradesh.

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

The infrared spectrum and Raman spectrum of cyclopropa-necarboxylic acid were recorded and analysed. Geometry and harmonic vibrational frequencies were calculated theoretically using Gaussian03 set of quantum chemistry codes. Calculations were performed at the Hartree-Fock and DFT level of theory using the standard 6-31G* basis. The calculated wavenumbers(B3LYP) agree well with the observed wavenumbers. The data obtained from vibrational wavenumber calculations are used to assign vibrational bands found in the IR and Raman spectra of the studied molecule. Calculated infrared intensities, Raman activities and first hyperpolarizability are reported. The calculated first hyperpolarizability is high and the title compound may be an attractive object for further studies on non linear optics. 
 

Department of Physics R.H.S.P.G Singramau, Jaunpur UP India

We have presented another property of black holes that may be obtained in classical general relativity: the transition between black holes and black strings when a transverse circle is made large or small. We have suggested a simple microscopic picture of this transition.

Microwave Tubes Division,Central Electronics Engineering Research Institute (CSIR) Pilani Rajasthan India

This work presents the thermal and structural analysis of collector for multi beam klystron (MBK) using convective heat transfer method for cooling of collector. The structural deformation and developed stresses along both the axial and radial directions, due to temperature distribution, has been simulated. The results has also been compared with different softwares, like, COSMOS and OPERA. 
 

¹M.E. Student (Structural Engg.) Civil Engineering Department Jabalpur Engineering College Jabalpur India

²Associate Professor Civil Engineering Department Jabalpur Engineering College Jabalpur India

Email:-Vij_vij@hotmail.com

The recently developed pushover analysis procedure has led a new dimension to performance-based design in structural engineering practices. Modeling for such analysis requires the determination of the nonlinear properties of each component in the structure, quantified by strength and deformation capacities, which depend on the modeling assumptions. With the increase in the magnitude of monotonic loading, weak links and failure modes in the multi-storey frames are usually formed. The force distribution and storey displacements are evaluated using static pushover analysis based on the assumption that the response is controlled by fundamental mode and no mode shift takes place. In view of the intensive construction, we required a completely up-to-date, versatile method of a seismic analysis and design of structures are essential. The major focus of study is to bring out the superiority of pushover analysis method over the conventional analysis method recommended by the code. The results obtained from the various studies show that the response spectrum method underestimates the response of the model in comparison with pushover analysis. It is also seen that model participation of higher modes contributes to better results of the response distribution along the height of the building. Also pushover curves are plotted to illustrate the displacement as a function of base shear. 
 

¹Department of Mathematics, National Institute of Technology Patna Bihar India

^2,3Department of Mathematics, Govt. S.M.S Model Science College, Gwalior India

 This paper concerns the slow viscous flow through a swarm of porous spherical particles enclosing a solid core. The Brinkman equation inside and the Stokes equation outside the porous spherical shell in their stream function formulations are used. As boundary conditions, continuity of velocity, continuity of normal stress and stress-jump condition at the porous and fluid interface, the continuity of velocity components on the solid spherical core are employed. On the hypothetical surface, uniform velocity and Kuwabara boundary conditions are used. The drag force experienced by each porous spherical shell in a cell is evaluated. As a particular case, the drag force experienced by a porous sphere in a cell with jump is also investigated. The earlier results reported for the drag force by Deo and Datta¹⁴ for the drag force experienced by a porous sphere in a cell without jump, Kuwabara⁴ for a solid sphere in a cell and Qin and Kaloni⁶ for a porous sphere in an unbounded medium have been then deduced. Representative results are presented in graphical form and discussed. 
 

¹M.E. Student (Structural Engg.) Civil Engineering Department Jabalpur Engineering College Jabalpur India

²Associate Professor Civil Engineering Department Jabalpur Engineering College Jabalpur India

A common type of construction in reinforced concrete (RC) buildings involves filling the vertical spaces created by the adjoining RC beams and columns with unreinforced masonry walls. The walls usually referred to as infill walls, in most instances are built as partitions or as cladding after the frame is constructed. The infill masonry is usually about 230-250mm thick and is mostly composed of burnt clay bricks, burnt clay tiles or hollow concrete blocks, in cement mortar. In such structures, the infill's often control the global response and performance, especially when acted upon by lateral loads. Experience from past earthquakes shows that strong infill's, although non engineered, often provide most of the lateral resistance and prevent collapse of relatively flexible and weak reinforced concrete frames, that are necessarily designed for the seismic forces. 

Role of infill's in altering the behaviour of moment resisting frames and their participation in transfer of loads has been established by decades of research. The surveys of buildings damaged in earthquakes further reinforce this understanding. The positive aspects of the presence of infills are higher strength and higher stiffness of the infilled frames. Nevertheless, it may not be appropriate to neglect their presence and declare the resulting design as conservative. Observed infill induced damage in the buildings in the past earthquakes exposes the shortcomings of the current bare -frame approach. The non-uniform distribution of infill walls along the plan and elevation of the buildings is on of the main reasons for the damage to such structures. 

Two opposing approaches exist in the design practice. According to the first, infills induce a significant source of uncertainty in
the seismic response, negate the efforts of the designer to control the seismic response and performance of the structure, and overall have more negative effects than positive. Accordingly infills are rendered non structural through proper isolations from surrounding structural members. But on the contrary, the other encourages the infills to be made integral with the frame and their strength and stiffness to be included in the design of the building. Because of economical considerations and uncertainty in the peak seismic demand on structure, including every element that contributes to earthquake resistance in both necessary and beneficial. 

The present study shows that infill's reduce the drift capacity and structural damage, and significantly increase the strength and stiffness of the structure. The column, beams and infill walls in the lower stories are more vulnerable to damage than those on the upper stories. The role of plinth beam is found to be significant when the contribution of infills is taken in to account in the building design. The structural ductility is reduced but the over strength is increased with the presence of infill's.