Coulomb forces impacts on nanomaterial transportation within porous tank with lid walls

Journal of Thermal Analysis and Calorimetry - Electrical sensor has been considered in the current attempt. Combination of buoyancy, electric and radiative forces has been included in the governing...     

Hybrid nanoparticle swirl flow due to presence of turbulator within a tube

Journal of Thermal Analysis and Calorimetry - The goal of the current attempt is to offer a new effective turbulator for increasing performance of a thermal system. Incorporating hybrid nanopowders...     

Dielectric investigation of the effect of ferric chloride on viscose fibres

Measurements of the dielectric constant and the dielectric loss, at frequencies of 0.05-10 kHz over a temperature range of 10–60 °C, were carried out on viscose fibres, viscose with iron adsorbed and with iron removed. The results obtained show that: (i) a relaxation process is observed in the low-frequency region only in the case of the viscose-iron complex, and (ii) the variation of the dielectric constant with temperature showed a transition at about 30 °C with the untreated fibres, and the transition disappeared when the fibres were treated with ferric chloride. These results, together with changes in hydrogen bonding obtained from infrared spectra for these samples are discussed. Oxidation and adsorption of ferric ions can modify the dielectric properties of viscose fibres.     

Crystallization and melting behavior of poly(ethylene oxide)/poly(n-butyl methacrylate) blends

The phase diagram, crystallization and melting behavior of poly(ethylene oxide) (PEO)/poly(n-butyl methacrylate) (PnBMA) blends have been investigated using differential scanning calorimetry and optical microscopy. The results show that the blends are miscible up to 85 °C and show an lower critical solution temperature-type demixing at a higher temperature. The isothermal crystallization studies of the blends indicate a reduction in the overall rate of crystallization. Analysis of isothermal crystallization data by means of Avrami equation leads to average values of the Avrami index of 2.5 for pure PEO and 3.0 for the different blend compositions. The melting behavior of the blends reveals double endotherms, which is ascribed to both secondary crystallization and recrystallization. The melting point depression study yielded χ₁₂=0, indicating a relatively low interaction strength.     

Simulation of convective MHD flow with inclusion of hybrid powders

Journal of Thermal Analysis and Calorimetry - In the present research, outputs of numerical modeling of hybrid nanomaterial flow structure and thermal behavior were investigated and in-house code...     

Split-width dual model

A crossing-symmetric amplitude with asymptotic Regge behaviour and second-sheet resonances with different widths for parents and each daughter is proposed. With a suitable choice of a function, ghosts and tachyons can be eliminated.     

Lambert function and a new non-extensive form of entropy

We propose a new way of defining entropy of a system, whichgives a general form that is non-extensive like Tsallis entropy,but is linearly dependent on component entropies, like Renyientropy, which is extensive. This entropy has a conceptuallynovel but simple origin and is mathematically easy to defineby a very simple expression involving a derivative. It leadsto a probability distribution function involving the Lambertfunction resulting from optimizing the entropy, which has hithertonever appeared in this context, and is somewhat more complexthan the Shannon or Boltzmann form, but is nevertheless mathematicallyquite tractable. We have compared it numerically with the Tsallisand Shannon entropies. We have also considered constraints onthe energy spectra imposed by the properties of the Lambertfunction, which are absent in the Shannon form. It may turnout to be a more appropriate candidate in a physical situationwhere the probability distribution does not suit any of thepreviously defined forms, especially when the probability densityfunction sought is expected to be stiffer than that resultingfrom maximizing the other entropies. We consider the problemof defining free energy and other thermodynamic functions whenthe entropy is given as a general function of the probabilitydistribution, including that for non-extensive forms. We thenfind that the free energy, which is central to the determinationof all other quantities of interest in a thermodynamic context,can be obtained uniquely, at least numerically, even when itis the root of a transcendental equation. In particular, weexamine the cases of the Tsallis form and the new form proposedby us. We compare the free energy, the internal energy and thespecific heat of a simple system of two energy states for eachof these forms and find significant departures for some quantities,while some others are less sensitive to the parametrization.     

The swallow-tail catastrophe and ferromagnetic hysteresis

We show that reduction of the transcendental equilibrium equation for a ferromagnetic prolate ellipsoid to a polynomial form categorizes the associated hysteresis phenomenon as part of the swallow-tail catastrophe-a topological model proposed by Thom to describe biological morphogenesis. We find, however, that only a small section of the whole surface is accessible for physical values of the parameters and that most non-trivial perturbations destroy the structural stability of the swallow tail.Department of Physics, University of Dacca, Dacca, Bangladesh     

Analytical investigation of nanoparticle migration in a duct considering thermal radiation

Journal of Thermal Analysis and Calorimetry - Buongiorno model is applied to investigate nanofluid migration through a permeable duct in the presence of external forces. Influences of radiation and...     

Ferrofluid non-Darcy heat transfer involving second law analysis: an application of CVFEM

Journal of Thermal Analysis and Calorimetry - The non-Darcy heat transportation of the ferrofluid together with the entropy generation has been studied in a permeable zone under the role of...