Volume 1 Issue 3

Authors: E. Sadeghi; F. Hosseini

Abstract: Correlation energy in 1s − 1s and 1s − 2s states of a two-electron spherical quantum dot with finite confining potential is calculated using the effective mass approximation, variational method and mean value theorem. The results show that the correlation energy is more significant for dots of smaller radii and larger barrier heights. The correlation energy decreases as the radius increases. The results are compared to other investigations.

Keywords: Quantum Dot; Correlation Energy; Mean Value Theorem

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Authors: A. Goswami; V. M. Datar; B. M. Jyrwa; T. N. Nathaniel; H. Naik; S. V. Suryanarayana; R. Acharya; Sylvia Badwar; Reetuparna Ghosh; B. S. Shivashankar

Abstract: Elemental analysis of sodium and aluminum in glass sample with reference to IAEA standard has been determine simultaneously by using neutron activation and off-line gamma ray spectrometric technique. The amount of sodium and aluminum was also calculated from the composition of the glass sample quoted by the supplier and compared with the experimental value in the present work. It was found that the experimental value for sodium is in good agreement with the theoretical values. However, in the case of aluminum, the experimental value is around seven times higher than the theoretical value. Reason for this discrepancy has been investigated.

Keywords: Neutron Activation Analysis; off-Line Gamma Ray Spectrometry; Glass Sample; Sodium and Aluminum Estimation

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Authors: Dianchen Lu; Baojian Hong

Abstract: In this paper, some new exact solutions for the vari able-coefficient generalized KdV-mKdV equation (VGKdV-mKdV) with nonlinear terms of any order are obtained by using the generalized Jacobi elliptic functions expansion method with computerized symbolic computation, some of these solutions are degenerated to soliton-like solutions and trigonometric function solutions in the limit cases, which shows that the applied method is more powerful and will be used in further works to establish more entirely new exact solutions for other kinds of nonlinear partial differential equations with nonlinear terms of any order arising in mathematical physics.

Keywords: Generalized Jacobi Elliptic Functions Expansion Method; Generalized Kdv–Mkdv Equation; Exact Solutions; Soliton-Like Solutions; Jacobi Elliptic Wave-Like Solutions

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Authors: M. Karnan; M. Murugan; V. Balachandran; M. K. Murali

Abstract: The FT-IR and FT-Raman spectra of 2-bromo-4-nitrotoluene (BNT) have been recorded in the region 4000-400 cm-1 and 3500-100 cm-1, respectively. The optimized molecular geometry, vibrational frequencies, Infrared intensities, Raman intensities and thermodynamic parameters in ground state were calculated using ab initio Hartree-Fock (HF) and density functional B3LYP methods (DFT) with 6-311++G(d,p) basis set. The observed FT-IR and FT-Raman vibrational frequencies are analysed and compared with theoretically predicted vibrational frequencies. The geometries and normal modes of vibration obtained from HF/6-311++G(d,p) and B3LYP/6-311++G(d,p) methods are reliable compared with the experimental data. The Mulliken charges, the natural bonding orbital (NBO) analysis and thermodynamic functions of the investigated molecule were computed using HF and DFT calculations. The calculated HOMO and LUMO energies show that charge transfer occurs within molecule. The influences of bromine and nitrogen atoms and methyl group on the geometry of benzene and its normal modes of vibrations have also been discussed.

Keywords: Vibrational Spectra; HF; DFT; HOMO-LUMO; NBO; 2-Bromo-4-Nitrotoluene

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Authors: K. Kannagi; E. Jasmine Vasantha Rani; R. Padmavathy; N. Radha

Abstract: Solute solvent interactions are conveniently studied with application of acoustic and spectroscopy techniques. Measurement of sound velocity is having an important role in the study of thermodynamic properties such as internal pressure, free volume of solution. Different liquid systems differ essentially in their relative degree of cohesion. In the present study L. Arginine derivative in non-aqueous solution is taken as the sample and the fundamental parameters namely density, viscosity and ultrasonic velocity are determined for different concentrations from very low temperature to higher temperature. Using these fundamental quantities acoustic and thermodynamic parameters are computed and analyzed. The results obtained from spectroscopic and acoustic study support the significance of the thermodynamic behavior of the sample.

Keywords: Acoustic Study; Thermodynamic Behavior; Solute Solvent Interactions

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Authors: Jayesh Wagh; Jean Berthier

Abstract: Micro flow-focusing devices (mFFDs) have been used extensively to produce emulsions and for the on-line encapsulation of biologic objects, such as bacteria and cells. More recently, new designs of this type of instrument have been imagined, for example to produce multi-layered capsules. In this work, we present a novel design of mFFD that comprises “moustaches”, i.e. escape microchannels, just upstream of the orifice. In the context of encapsulation, such a design authorizes the control of the number of biologic objects imprisoned in a single capsule, and avoids the emission of empty capsules. We have denoted this new type of FFD by the abbreviation EFFD, for “Escape FFD”. We first present the concept of the system, then we derive the pressure conditions for the proper functioning of the device, and finally we present an experimental realization.

Keywords: Flow-Focusing Device; Encapsulation; Meniscus Stability; Interface Breakup; Escape Channels

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