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Search Results: 1 - 10 of 312349 matches for " P. K. Panda "
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Fabrication of Simple and Ring-Type Piezo Actuators and Their Characterization
B. Sahoo,P. K. Panda
Smart Materials Research , 2012, DOI: 10.1155/2012/821847
Abstract: A piezo multilayered stack of height 10?mm is fabricated using 80?μm thick PZT tapes prepared by tape-casting technique. About 120 layers of thin tapes are dried, screen-printed with Pt-electrode paste, stacked, laminated, and then isopressed to obtain a green multilayered stack. Cofiring of the stack is carried out at C for 1?h with very slow heating rate ( per 1?h). The sintered stack is poled at 2?kV per mm in hot ( C) silicone oil bath for 45 minutes, and free displacement and block force were characterized. The actuator generates free displacement of 10?μm (0.1% strain) and block force of 1427?N at 175?V. In a similar way, a ring-shaped multilayered PZT stack was fabricated; the displacement was measured to be 8?μm. The ring-type actuator is mainly used for fluid flow control in space vehicles. 1. Introduction Piezo actuators/sensors are mainly used for smart applications because of their (i) fast response time, (ii) high frequency response, (iii) precession control, (iv) capablity of generating high block force, and so forth [1]. The sensors and actuators with appropriate control unit together form a smart system. Piezo sensors and actuators are used for various applications such as vibration control of aerospace structures, development of smart aeroplane wings, propellant flow control in space vehicles, and fuel flow control in automobile engines. Lead zirconate titanate (PZT) is a well-known piezo material that produces electric charges on application of mechanical stress (as sensor) or undergoes dimensional change when subjected to an electric field (as actuator) [2–6]. For these properties PZT is frequently used for fabrication of multilayered actuators. Ring-type actuator is a special type of actuators exclusively used for flow control purpose. Weight/size reduction of a space instrument or subsystem of a space craft is necessary to save enormous launching cost as well as to increase the mission duration. The reduction in thrust levels for miniaturized spacecraft requires very fine propellant flow rates. Solenoid valves used for flow control are very heavy. Piezo-material-based microactuators could be best suitable for these applications due to their precision flow control [7] effected by the gradual application of voltage and also due to their low weight. Therefore, in this study, an effort has been made to fabricate PZT multilayered stack and a ring-type actuator by tape casting technique and block force and displacement were characterized. 2. Experimental Procedure 2.1. Fabrication of Simple Multilayered (ML) Stack PZT stacks were
Field theoretic study of light hypernuclei
P. K. Panda,R. Sahu
Physics , 1997,
Abstract: A nonperturbative field theoretic calculation has been made for the $s$-shell hypernuclei. Here we dress the $\Lambda$- and $\Sigma$- hypernuclei with off-mass shell pion pairs. The analysis replaces the scalar isoscalar potential by quantum coherent states. The binding energies of $^{4+n\Lambda}$He $(n=0,1,2)$ agree quite well with the RMF result of Greiner. The experimental binding energies of $^4$He and $^3$He are reasonably well reproduced in our calculation. A satisfactory description of the relevant experimental $\Lambda$- and $\Sigma$- separation energies has been obtained.
Cobalancing numbers and cobalancers
G. K. Panda,P. K. Ray
International Journal of Mathematics and Mathematical Sciences , 2005, DOI: 10.1155/ijmms.2005.1189
Abstract: Cobalancing numbers and cobalancers are defined and introduced. Many properties of cobalancing numbers are explored. A link between the Pythagorean triplets and the cobalancing numbers is also established.
Supplementation of Vitamin E and C Reduces Oxidative Stress in Broiler Breeder Hens during Summer  [PDF]
B. P. Jena, N. Panda, R. C. Patra, P. K. Mishra, N. C. Behura, B. Panigrahi
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.48A004
Abstract: The present experiment was carried out to evaluate the effects of vitamin E and C supplementation on the antioxidant status of broiler breeder hens during summer. Two hundred seventy broiler breeder birds (coloured) were divided into nine groups with three replicates having 10 birds in each, and were supplemented two levels of antioxidant vitamins E (250 mg or 500 mg/kg) or C (200 mg or 400 mg/kg) alone or in combinations for a period of 8 weeks. All the vitamin supplemented groups showed significantly lowered malondialdehyde (MDA) level, higher activities of superoxide dismutase (SOD), catalase (CAT) enzymes and higher Ferric Reducing Antioxidant Power (FRAP) activities in erythrocytes than control. However, supplementation with combination of vitamins proved to be better than individual supplementation. It could be concluded that the combination of vitamins C and E at lower level (@ 200 mg/kg and 250 mg/kg, respectively) had higher erythrocytic antioxidant status in coloured broiler breeder hens as compared to individual vitamin supplementation during hot and humid stress.
Nuclear Structure corrections for Parity Non-conservation in Atomic Ba$^+$ and Ra$^+$
P. K. Panda,B. P. Das
Physics , 2005,
Abstract: We calculate the binding energy, charge radii in $^{126}$Ba--$^{140}$Ba and $^{214}$Ra--$^{228}$Ra using the relativistic mean field theory which includes scalar and vector mesons. We then evaluate the nuclear structure corrections to the weak charges for a series of isotopes of these atoms using different parameters and estimate their uncertainty in the framework of this model. Our results will have important implication for the ongoing and planned parity non-conservation experiments and atomic structure calculations on Ba$^+$ and Ra$^+$.
STUDY OF ANTIULCER ACTIVITY OF ROOTS OF ALANGIUM SALVIFOLIUM LINN. IN PYLORUS LIGATED RATS
Mohanty P.K.,Panda S.K.,Mishra S.K.,Panda P.K.
International Research Journal of Pharmacy , 2011,
Abstract: Different extracts of Alangium salvifolium Linn. roots were tested for its antiulcer activity in aspirin induced and pylorus ligated rats model. The effect was assessed by parameters like Total acidity(TA),Free acidity(FA),Peptic activity(PA), Ulcer Index(UI) .The antiucler activity of all extracts were compared to the standard drug ranitidine. The study showed that all extracts were showing reductions TA, PA, FA and UI among which the extract of petroleum ether showed significant reduction upon those parameters. Alangium salvifolium Linn (400mg/kg) (PE extracts) shows complete inhibition ulceration and results are at par with (5mg/kg) of ranitidine.
Quantum Vacuum in Hot Nuclear Matter - A Nonperturbative Treatment
Amruta Mishra,P. K. Panda,W. Greiner
Physics , 2001, DOI: 10.1088/0954-3899/27/7/314
Abstract: We derive the equation of state for hot nuclear matter using Walecka model in a nonperturbative formalism. We include here the vacuum polarisation effects arising from the nucleon and scalar mesons through a realignment of the vacuum. A ground state structure with baryon-antibaryon condensates yields the results obtained through the relativistic Hartree approximation (RHA) of summing baryonic tadpole diagrams. Generalization of such a state to include the quantum effects for the scalar meson fields through the $\sigma$-meson condensates amounts to summing over a class of multiloop diagrams. The techniques of thermofield dynamics (TFD) method are used for the finite temperature and finite density calculations. The in-medium nucleon and sigma meson masses are also calculated in a self consistent manner. We examine the liquid-gas phase transition at low temperatures ($\approx$ 20 MeV), as well as apply the formalism to high temperatures to examine for a possible chiral symmetry restoration phase transition.
Self-consistent quantum effects in the quark meson coupling model
P. K. Panda,F. L. Braghin
Physics , 2001, DOI: 10.1103/PhysRevC.66.055207
Abstract: We derive the equation of state of nuclear matter including vacuum polarization effects arising from the nucleons and the sigma mesons in the quark-meson coupling model which incorporates explicitly quark degrees of freedom with quark coupled to the scalar and vector mesons. This leads to a softer equation of state for nuclear matter giving a lower value of incompressibility than would be reached without quantum effects. The {\it in-medium} nucleon and sigma meson masses are also calculated in a self-consistent manner.
Rotating compact star with superconducting quark matter
P. K. Panda,H. S. Nataraj
Physics , 2006, DOI: 10.1103/PhysRevC.73.025807
Abstract: A compact star with superconducting quark core, the hadron crust and the mixed phase between the two is considered. The quark meson coupling model for hadron matter and the color flavor locked quark model for quark matter is used in order to construct the equation of state for the compact star. The effect of pairing of quarks in the color flavor locked phase and the mixed phase on the mass, radius, and period of the rotating star is studied.
Vacuum polarization effects in hyperon rich dense matter -- a nonperturbative treatment
Amruta Mishra,P. K. Panda,W. Greiner
Physics , 2000, DOI: 10.1088/0954-3899/28/1/305
Abstract: We derive the equation of state (EOS) for electrically charge neutral dense matter using Quantum Hadrodynamics (QHD) model. This is carried out in a nonperturbative manner including quantum corrections for baryons through a realignment of vacuum with baryon-antibaryon condensates. This yields the results of relativistic Hartree approximation of summing over baryonic tadpole diagrams. The quantum corrections from the scalar meson is also taken into account in a similar way. This leads to a softening of the equation of state for the hyperonic matter. The formalism also allows us to do a self consistent calculation of the in-medium sigma meson mass. The effects of such quantum corrections on the composition of charge neutral dense matter is considered. The effect of the resulting EOS on the structure of the neutron stars is also studied.
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