The MRF-Sensitization of Gold-Bearing Rock Crystals

Dr. Pawan Kumar

Associate Prof., Department of  Physics, A.S. (P.G.) College, Sikandrabad, U.P., India.

A series of experimentation on geo-rock crystals such as gold containing minerals, peridotite. pyroxnite, proterozoic volcanic rocks, lava tubes & their contents etc. under the artificial feedback of signals and fields manifests a typical development of electrical as well as magneto-conductivity with big anisotropy. Which confirms the existence of multi-layered, auto-blanketed, nucleo-ionic condensation ‘n’ of the order of 10¹⁴ – 10¹⁶. The temporal development of the magneto-potential records shows the possibility of channelizing the earthquake energy in stimulating cold-fusion processes in MRF-Sensitized geo matters in the subduction zones of earth.

Keywords: temporal development, geo matters, magneto potential.

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Temperature Dependent Magnetization and Critical Current Density in Pr doped HTS YBa₂Cu₃O_x

Dr. Pawan Kumar

Associate Prof., Department of  Physics, A.S. (P.G.) College,Sikandrabad, U.P., India.

In present study we have studied the variation of magnetization versus applied field up to 4 T over a wide temperature range from 10 K to 70 K for Pr doped polycrystalline YBa₂Cu₃O_x. The critical current density has been calculated based on the magnetization measurements. Our titration measurements yielded an oxygen content of x=6.98 for the 400°C-annealed sample and x=6.62 for the 600°C-annealed sample. The electrical resistivity experiments showed transition temperature T_c. values of 91 K and 63 K for the samples annealed at 400°C and 600°C, respectively.

Keywords: Magnetization, Current density, Superconductivity.

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Characterization of copolymer nanocomposite of 3,4-dimethyl pyrrole and 4-methoxy-2-methyl aniline

Ajay Chauhan¹, Rajeev Rathore^2,* and Pradeep Kumar Yadav¹

¹Physics Department, Meerut College, Meerut, U.P., India.

²Chemistry Department, Meerut College, Meerut, U.P., India.

^*email: r.rathore_@hotmail.com

Nanocomposites copolymer of 3,4-dimethyl pyrrole (DMPy) and 4-methoxy-2-methyl aniline (MMA) is synthesized using chemical oxidative polymerization doped with HCl and Ammonium persulfate (APS) used as an oxidant. Nanocomposite obtained is characterized for structural configurations by UV-Vis and FTIR spectrophotometer, TGA, XRD. Four probe method is adopted for the measurement of electrical conductivity. Spectral study confirms the p-p* transition in nanocomposite copolymer. The formation of copolymer and its structure is confirmed by FTIR. The amorphous nature of polymer nanocomposite is established by the XRD. The electrical conductivity of sample was comparable to the intrinsic conductive polymers used. SEM micrographs are used to study the size and surface morphology of copolymer nanocomposite.

Key words:   Copolymer, nanocomposite, UV-VIS, XRD, SEM, FTIR.

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To Study the Variation of Second Order Elastic Coefficient (SOEC) with Pressure for Binary Semiconductor Belonging to II-VI and III-V Groups of Semiconductors

Dr. R.S. Indolia and Dr. Chandravir Singh

Department of Physics, Agra College, Agra, U.P. India.

E-mail – rsindolia2014@gmail.com, drcvsinghph@gmail.com

The variation of second order elastic coefficient (SOEC) of II-VI and III-V groups of semiconductors with pressure have been studied. On the basis of best fit data, the variation of SOEC with pressure can be well fitted by polynomial curve for C₁₁ and C₁₂ and linearly fitted for C_44. These results are in excellent agreement with the values reported by different researchers.

Key words: Second order elastic coefficient (SOEC), II-VI and III-V groups of binary semiconductors.

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Pressure Volume Calculations in FCC Metals using Two Body Potentials

V. Singh^{1 *} and B.K. Sharma²

^1* Physics Department, Agra College, Agra, U.P., India.

² Physics Department, Agra College, Agra, U.P., India.

 ^1* agravikram@rediffmail.com

² bks_phys@rediffmail.com

* Author for correspondence Tel +91 9456403205

Pressure volume (P-V) calculations of FCC metals (Copper, Silver, Gold, Aluminum and Nickel) have been carried out by taking simple two body Kuchhal and Das (K. D.) and Morse potential. In case of K. D. potential, the computed results of P-V calculations are fairly close with experimental results. At high relative volume, the computed results with Morse potential are closely match with experimental results but at low relative volume, calculated and experimental results are poor match. Our study shows that computed results with K. D. potential gives better results of P-V calculations for all FCC metals in comparison to computed results with Morse potential.

Keywords: Two body potential, FCC metals, Mechanical properties, Elastic constants.

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Resonant Frequency of a Circular Patch Antenna (CPA) with an air gap in S and X Band

Dr. Sandhya Mann

 Assistant Professor, Department of Physics, Agra College, Agra, U.P., India.

An important analytical model is presented for the calculation of resonant frequency of a CPA with an air gap at two operating frequencies 3 and 10 GHz in S and X band range. This approach has a great degree of freedom in a sense that it is applicable to all dimensions, small to large and all shapes. The CPA with an air gap was introduced by Lee and Dahele and has been investigated for circular patch geometry.

Keywords:  Microstrip antennas, Resonance frequency, Air gap.

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