Open Access Short Note

Cluster Mechanism of Formation of Biological Nanoobjects and Mesoobjects

E. E. Lin

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2016/26626

In this work, we consider a scheme of a direct synthesis of volumetric protein nanoparticles in a system previously consisted of amino acid molecules by using an asymptotic method of kinetics for forming objects having quantum features. A proposed model gives formally calculated sizes, which correspond to characteristic dimensions of protein nanoparticles (hemoglobin, elastin and lipoprotein). In addition, the model provides a mesoscopic range of sizes, which is in keeping with characteristic dimensions of non-dividing cells (erythrocytes and small lymphocytes) as well as of simplest organisms.

 

Open Access Original Research Article

A Statistical Approach to Estimate Wind Speed Distribution in Ibadan, Nigeria

K. O. Rauff, E. F. Nymphas

Physical Science International Journal, Page 1-14
DOI: 10.9734/PSIJ/2016/27050

In this paper, the wind energy potential in Ibadan is statistically analyzed using daily wind speed data for 10 years (1995-2004) obtained from the International Institute of Tropical Agriculture (IITA) and 1 year (2006) obtained from Nigeria Micro-scale Experimental (NIMEX) Ibadan, Nigeria. The statistical wind data set was analyzed using Weibull distributions in order to investigate the Weibull shape and scale parameters. The daily, monthly, seasonal, and yearly wind speed probability density distributions were modeled using Weibull Distribution Function. The measured annual mean wind speed was found to be 0.76 m/s and the total extractable wind power has been estimated as 0.33 kW at IITA while the annual mean wind speed ranged between 0.74 m/s, 1.02 m/s, 1.16 m/s and 1.34 m/s at (3 m, 6 m, 12 m and 15 m) respectively at NIMEX. The maximum extractable annual wind power density value of 0.90W / m2 for the whole year at IITA and 5.61W / m2 at the highest height of 15 m at NIMEX indicated that, Ibadan can be classified as a low wind energy region and it belongs to the wind power class 1, since the density is less than 100W / m2 . It is concluded that at both sites, the highest wind speed that prevailed in Ibadan is March and the location can be explored for wind power.

Open Access Original Research Article

Magnetic Properties of a Quasi-two-dimensional Heisenberg Antiferromagnet α -RbCrF4

Yoko Miura, Ryota Sueyoshi, Hirotaka Manaka

Physical Science International Journal, Page 1-8
DOI: 10.9734/PSIJ/2016/27184

We synthesized a quasi-two-dimensional Heisenberg antiferromagnet on a square lattice formed in α -RbCrF4 by improving the pretreatment method before primary sintering. From X-ray diffraction measurements, the crystal structure was found to consist of a TlAlF4-type structure, which shows a good two-dimensionality. But the splitting of the fundamental peak indicating a superstructure in the ab-plane appeared. Temperature dependence of magnetic susceptibility shows a broad peak, which indicates typical low-dimensional antiferromagnets, at Tmax ≈ 47K . Furthermore, a sharp peak which indicates an antiferromagnetic phase transition also appeared at TN = 29.3(2) K. Following several previous theoretical investigations, we estimated intra-layer (Jintra) and inter-layer (Jinter) exchange interactions to be JintraKB = -6.6(1) K  and Jinter / Jintra ≈ 0.05 , respectively. As a result, we found that α -RbCrF4 is a quasi-two-dimensional Heisenberg antiferromagnet.

Open Access Original Research Article

Study of the Thermal and Mechanical Performance of Laterite Blocks Mixed with Néré Pod for the Thermal Insulation of Buildings

Imbga B. Kossi, Kieno P. Florent, Sambou Vincent, Ouedraogo Emmanuel, Gouba Daniel, Toure P. Moussa

Physical Science International Journal, Page 1-10
DOI: 10.9734/PSIJ/2016/25610

This paper presents an experimental study on the characterization of local materials used in the construction of buildings. These materials are laterite blocks associated with rates ranging between 0% and 16% with a pace of 4% of Néré pod. We observed that the thermal conductivity decreases and as the Néré pod rate increases. But it gets stabilized at 14-16% with a corresponding value of 0.427W / (m.K). The compressive strength is observed for these same value rates of Néré pod. We found that the compressive strength of the various formulations decrease as the additive rate increases; it decreases by  when we add 4% of Néré pod and by 41.96% when adding 8% of Néré pod. We find that the compressive strength improves when the Néré pod dosing rate is higher than 8%. In this case it is reduced by 19.6%. This rate is 15.63% when we had 12% and 16% of Néré pod respectively. The ripening of the various formulations was also observed. particularly the LG8%; As a result the thermal conductivity and the compressive strength increase with the length of stay of the Néré pod in the laterite. However. the 9th day remains the maximum duration of ripening which improves the compressive strength of the LG8% formulation as it increases from at day 0 to in 1.874 MPa  the 9th day; this value is reduced by at the 12th day of ripening. The decrease in compressive strength in the 12th day is probably due to the decay of plant material i.e. the Néré pod.

Open Access Original Research Article

Simple Generalization of the Quantum Mechanical Virial Theorem for Nonrelativistic Systems with Rotational Symmetry

Domagoj Kuić

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2016/27935

In this paper we show that the generalization of the virial theorem can be achieved for nonrelativistic quantum mechanical systems under the conditions of rotational symmetry and the constancy of the trace of moment of inertia tensor. Under these conditions the matrix elements of the commutator of the generator of dilations G and the Hamiltonian H are equal to zero on the subspace of the Hilbert space generated by the simultaneous eigenvectors of the particular maximal set of commuting self-adjoint operators which contains H, J2, Jz, the trace of the moment of inertia tensor TrI and additional operators. The result obtained is relevant for an important class of N-particle nonrelativistic quantum mechanical systems.

 

Open Access Original Research Article

Series Expansion Method for Exploring Critical Behavior in Diluted Magnetic Semiconductors

Habte Dulla Berry

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2016/28109

In this study the author focuses on thermal and magnetic properties of diluted magnetic semiconductors at critical point. Such properties are discontinuous at some point in the critical region so that it is very important to study their critical behavior in these regions. In order to study these critical behaviors the author uses series expansion technique and quantum lattice model with help of computer program.