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We investigate cosmological models with extended Chaplygin gas (ECG) as a candidate for dark energy and determine the equation of state parameters using observed data namely, observed Hubble data, baryon acoustic oscillation data and cosmic microwave background shift data. Cosmological models are investigated considering cosmic fluid which is an extension of Chaplygin gas, however, it reduces to modified...
The paper presents a drain current model for double gate metal oxide semiconductor field effect transistors (DG MOSFETs) based on a new velocity saturation model that accounts for short-channel velocity saturation effect independently in the front and the back gate controlled channels under asymmetric front and back gate bias and oxide thickness. To determine the front and the back-channel velocity...
In this paper, the classical problem of the motion of a particle in one dimension with an external time-dependent field is studied from the point of view of the dynamical system. The dynamical equations of motion of the particle are formulated. Equilibrium points of the non-oscillating systems are found and their local stability natures are analysed. Effect of oscillating potential barrier is analysed...
In the last few decades, researchers have proposed many control techniques to suppress unwanted vibrations in a structure. In this work, a novel and simple technique is proposed for the active vibration control. In this technique, an optimal tracking control is employed to suppress vibrations in a structure by simultaneously tracking zero references for modes of vibration. To illustrate the technique,...
In the present investigation, ion-acoustic double layers in an inhomogeneous plasma consisting of Maxwellian and non-thermal distributions of electrons are studied. We have derived a modified Korteweg–de Vries (mKdV) equation for ion-acoustic double layers propagating in a collisionless inhomogeneous plasma. It is observed that the non-thermal parameters affect the amplitude and width of the double...
This systematic study reports various electron impact cross-sections, rate constants and transport properties of $$\hbox {NH}_2$$ NH 2 radical in the low-energy limit. The collision study is based on R-matrix formalism and involves the use of various scattering models employing different active spaces. Both electron excited inelastic cross-sections and resonances are found influenced by...
In the commutative geometrical background, one finds the total charge (Q) and/or the total angular momentum (J) of a generalized black hole of mass M to be bounded by the condition $$Q^2+\left( J{/}M\right) ^2\le M^2$$ Q 2 + J / M 2 ≤ M 2 , whereas the inclusion of the concept of non-commutativity in geometry leads to a much more richer result. It predicts that the upper limit to...
We study theoretically the transverse spin associated with the eigenmodes of a thin metal film embedded in a dielectric. We show that the transverse spin has a direct dependence on the nature and strength of the coupling leading to two distinct branches for the long- and short-range modes. We show that the short-range mode exhibits larger extraordinary spin because of its more ‘structured’ nature...
A theoretical study of electronic and optical properties of metal-halide cubic perovskite, $$\hbox {CsPbI}_3$$ CsPbI 3 , is presented, using first-principles calculations with plane-wave pseudopotential method as implemented in the PWSCF code. In this approach, local density approximation (LDA) is used for exchange-correlation potential. A strong ionic bonding is observed between Cs and...
A new exact solution of embedding class I is presented for a relativistic anisotropic massive fluid sphere. The new exact solution satisfies Karmarkar condition, is well-behaved in all respects, and therefore is suitable for the modelling of superdense stars. Consequently, using this solution, we have studied in detail two compact stars, namely, XTE J1739-289 (strange star $$1.51M_{\odot }$$ ...
Emergent Universe (EU) model is investigated here using the recent observational data of the background tests. The background test data comprise observed Hubble data, baryon acoustic oscillation data, cosmic microwave background shift data and Union compilation(2.1) data. The flat EU model obtained by Mukherjee et al is permitted with a non-linear equation of state (in short, EoS) ( $$p=A\rho -B\rho...
The synthesis of cobalt-based magnetic nanostructures using DC arc discharge technique with varying arc current is reported here. The structural, morphological, compositional and magnetic properties of these nanostructures were studied as a function of applied arc current. Various techniques like X-ray diffraction, transmission electron microscopy, EDAX and vibrating sample magnetometry were used...
The nuclear quadrupole moments, Q, for the ground and first excited states in $$^{99}\hbox {Ru}$$ 99 Ru and ground state of $$^{101}\hbox {Ru}$$ 101 Ru have been determined by comparing the experimentally observed quadrupole interaction frequencies $$\nu _Q$$ ν Q with calculated electric field gradient (EFG) for a large number of Ru-based compounds. The ab-initio...
Many researchers introduce schemes for designing multistable systems by coupling two identical systems. In this paper, we introduce a generalized scheme for designing multistable systems by coupling two different dynamical systems. The basic idea of the scheme is to design partial synchronization of states between the coupled systems and finding some completely initial condition-dependent constants...
In this paper, the strain, band-edge, and energy levels of pyramidal $$\hbox {In}_x \hbox {Ga}_{1-x} \hbox {As}/\hbox {GaAs}$$ In x Ga 1 - x As / GaAs quantum dots are investigated by 1-band effective mass approach. It is shown that while temperature has no remarkable effect on the strain tensor, the band gap lowers and the radiation wavelength elongates by increasing temperature...
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