Open Access Original Research Article

Information’s Relativistic Convey with Matter Wave’s Non-Dispersive Propagation

Wang Xinye

Physical Science International Journal, Page 1-4
DOI: 10.9734/psij/2020/v24i1130221

The Wave-Particle Duality is a basic property of microscopic particles. As a basic concept of quantum mechanics, the wave-particle duality theory from elementary particles to big molecules had been verified by lots of experiments. Different from electromagnetic wave, the matter wave’s propagation is not only fast but also adjustable. According to the special relativity theory, the group velocity with which the overall envelope shape of the wave, namely the related particle’s propagation and information convey speed is changeable with its energy and related wavelength, among which only the energy exceeds over the minimum value, the propagation can be starting and the velocity is not allowed to surpass the maximum value i.e. the light speed in vacuum. Take electron as an example, if the free electron beam gains energy higher than around 8.187×10ˉᴵ⁴J and the related wavelength is shorter than around 5.316×10ˉ³nm, the matter wave with information can start to propagate.  

Open Access Original Research Article

Numerical Study of the Performance of a Double-Insulated Barbecue Oven: Implication for Energy Savings and Thermal Comfort

Serge Wendsida Igo, Gaël Lassina Sawadogo, Drissa Ouedraogo, Abdoulaye Compaoré, David Namoano, Joseph Dieudonné Bathiébo

Physical Science International Journal, Page 5-18
DOI: 10.9734/psij/2020/v24i1130222

This work is devoted to a numerical study of the performance of a double insulated barbecue oven using terracotta bricks and plywood. The numerical methodology is based on the nodal method and the heat transfer equations have been established by performing an energy balance on each node. The equations obtained were then discretized using an implicit finite difference scheme and solved by the Gauss algorithm. The numerical results validated by the experiment show that this double insulation considerably reduces the energy losses through the walls of the oven. However, the addition of plywood does not significantly change the energy savings compared to simple terracotta insulation but does drop the external wall temperatures. Thus, for 4 cm of thickness of terracotta bricks and 1 cm of plywood, the energy savings (compared to the non-insulated oven) are of the order of 70% and the temperature of the outer walls of the oven does not exceed not 60°C, which ensures better thermal comfort for users.

Open Access Original Research Article

The Study of the Ground State Properties of Heavy Famion System Using an Extended Kondo-Anderson Model in One Dimension

Okunzuwa I. Samuel, C. Okaro Augustine

Physical Science International Journal, Page 43-51
DOI: 10.9734/psij/2020/v24i1130226

The Kondo interaction coupling, Heisenberg exchange coupling, and Coulomb interactions within d-sites, were introduced in a one dimensional Periodic Anderson Model Hamiltonian (PAMH) to further investigate the effects of interaction parameters on the ground state energy of systems with heavy fermions (HF) behavior. Periodic Anderson model PAM being one of the most successful model for studying the heavy fermions System (HFS) was used in an extended version (mixed Kondo-Anderson representation) on a system of three-electrons interacting on three-sites cluster. Exact Diagonalization technique (EDT) normally used to solve conventional PAM calculation was considered in this work for a very small cluster. Hamiltonian used to describe this model contains the usual term describing the kinetic energy of the system, on-site coulomb repulsion and a hopping integral. The Hamiltonian is acted on the different Hilbert states of the lattice system and results of the interactions were obtained in terms of hopping integral, coulomb repulsions, exchange couplings and the hybridization term. Graphs of ground state energy Eo plotted agains tthese interaction parameters were presented in a clear format. As these parameters were varied numerically through a finite range of values, the individual effects of these parameters on the system’s ground state energy were observed and discussed. Hence, the results obtained from this work shows theoretically how the tuning of the Columbic interaction within the conduction band  provides information that sheds light on the underlying physics of the heavy fermions systems models. Results obtained from this work further demonstrate the reliability of the model Hamiltonians that we have harnessed and the importance of considering electron-lattice interactions as well as interactions that account for magnetic impurities for the proper description of heavy fermions material.

Open Access Original Research Article

Design of Vertical Axis Wind Turbine Darrieus Type (H- Darrieus Rotor) of 0.20 KW from the Software Topsolid

Hagninou E. V. Donnou, Drissa Boro, Donald Abode, Brunel Capo-Chichi, Aristide B. Akpo

Physical Science International Journal, Page 52-70
DOI: 10.9734/psij/2020/v24i1130227

The design of a vertical axis wind turbine (Darrieus type) adapted to the site of
Cotonou in the coastal region of Benin was investigated. The statistical study of winds based on the Weibull distribution was carried out on hourly wind data measured at 10 m above the ground by the Agency for the Safety of Air Navigation in Africa and Madagascar (ASECNA) over the period from January 1981 to December 2014. The geometrical and functional parameters of the wind turbine were determined from different models and aerodynamic approaches. The digital design and assembly of the wind turbine components were carried out using the TOPSOLID software. The designed wind turbine has a power of 200W. It is equipped with a synchronous generator with permanent magnets and has three wooden blades with NACA 0015 profile. The optimal coefficient of lift and drag were estimated respectively at 0.7832 and 0.01578. The blades are characterized by an optimum angle of attack estimated at 6.25° with a maximum fineness of 49.63. Their length is 4 m and the maximum thickness is estimated at 0.03 m with a chord of 0.20 m. The volume and mass are respectively equal to 0.024 m3 and 36 kg. The aerodynamic stall occurs at an attack angle of 14.25°. The aerodynamic force exerted on these blades is estimated to be 240 N. The aerodynamic stresses exerted on the rotor are estimated at 15 864 504 Pa and the solidity at 0.27. The efficiency of the wind turbine is 0.323. From TOPSOLID, the geometrical shape of each component of the wind turbine is represented in three dimensions. The assembly allowed to visualizing the wind turbine after export via its graphical interface. The quantity of annual energy produced by the wind turbine was estimated at 0.85 MWh. This study is the first to be carried out in the study area and could reduce the technological dependence of vertical axis wind turbines and their import for low cost energy production.

Open Access Review Article

P-T-X and P-T-h Diagrams of the Working Pair H20/LiBr at Thermodynamic Equilibrium and Charts that Permit to Determine its Thermodynamic Properties

Yves Christian Nonguierma, Amadou Konfe, Dieudonné Joseph Bathiebo

Physical Science International Journal, Page 19-42
DOI: 10.9734/psij/2020/v24i1130223

The thermodynamic properties at equilibrium, in this case, enthalpy, pressure, temperature, mass fraction, of working pairs are very important for researchers and in the design of absorption refrigeration systems. Although some authors have carried out their research in this direction by setting up empirical formulas, there are unfortunately no charts or easy-to-use diagrams making it possible to have these properties for the couple H20/LiBr. The aim of this present study is to make a small contribution by making charts and diagrams available to all, making it possible to quickly and easily obtain the properties of lithium bromide at thermodynamic equilibrium.