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Volume 9, No. 1, 2016, 1437 H

 English Articles

 

 

About the Cosmological Constant, Acceleration Field, Pressure Field and Energy

Based on the condition of relativistic energy uniqueness, the calibration of the cosmological constant was performed. This allowed to obtain the corresponding equation for the metric and to determine the generalized momentum, the relativistic energy, momentum and mass of the system, as well as the expressions for the kinetic and potential energies. The scalar curvature at an arbitrary point of the system equaled zero, if the matter is absent at this point; the presence of a gravitational or electromagnetic field is enough for the space-time curvature. Four-potentials of the acceleration field and pressure field, as well as tensor invariants determining the energy density of these fields, were introduced into the Lagrangian in order to describe the system’s motion more precisely. ...

 

Sergey G. Fedosin

JJP, 2016, 9(1) , 1-30

Fine Particle Number Concentrations in Amman and Zarqa during Spring 2014

We measured the fine particle number concentrations at four sites in Amman and one site in Zarqa during March 6 – May 28, 2014. These were urban except for one, which was a sub-urban site. The highest number concentrations (24-hour median as high as 5.2×104 cm-3) were observed at Hai Masoum; an urban site in Zarqa influenced by traffic and industrial activities. In Amman, the highest number concentrations were observed at the urban residential sites (Umm Summaq and Al-Hashmi Al-Shamali, 24-hour median as high as 4.6×104 cm-3), whereas the lowest was at the sub-urban site (Shafa Badran, 24-hour median as high as 2.3×104 cm-3). The daily pattern of the fine particle number concentrations was characterized by three peaks during the daytime.  ...

 

T. Hussein,             

M. Halayaka,

R. Abu Al-Ruz,

H. Abdullah,

B. Mølgaard and

T. Petäjä

JJP, 2016, 9(1) , 31-46

Influence of Current Density on Morphology of Electrochemically Formed Porous Silicon

Porous silicon samples were prepared by electrochemical anodic etching of p–type silicon wafer in hydrofluoric (HF) acid-based solution. The electrochemical process allowed precise control of porous silicon properties, such as average pore diameter, average pore depth and porosity. The effect of current density on physical properties of porous silicon was investigated by Scanning Electron Microscopy (SEM), I-V characteristics and Fourier Transform Infrared (FTIR) spectroscopy. The average pore diameter and average pore depth were found to increase with the increase in current density. ...

 

Ammar M. Al-Husseini

JJP, 2016, 9(1) , 47-54

Radionuclides Measurements in Some Rock Samples Collected from the Environment of Hebron Governorate -Palestine

Using high-resolution γ- ray spectroscopy, the activity concentrations of some radioactive isotopes such as 238U, 232Th and 40K in different rock samples, collected from 31 quarries in Hebron Governorate, Palestine were measured. For this purpose, 62 rock samples were gathered from different quarries of the region under investigation. The measured activities of 238U, 232Th and 40K were found to range from 21.3 to 100.5, 1.3 to 11.6 and 13 to 583 Bqkg-1, with average values of 47.6, 4.2 and 100 Bqkg-1, respectively.   ...

 

K. M. Thabayneh,

L. A. Mashal,

K. M. Awawdeh and
M. M. Abu-Samreh
 

 

JJP, 2016, 9(1) , 55-64

The Study of Zero-Spin Isotopes with the Modified Manning-Rosen Potential by Relativistic Cluster Models

In this paper, we studied the zero-spin isotopes with N=Z and A=4n in relativistic cluster models as a system which can be considered to be composed of α-particles. For interaction between the clusters, we use modified Manning-Rosen potentials and solve the relativistic Klein-Gordon (KG) equation using the Nikiforov-Uvarov (NU) method to calculate the energy spectrum. We found the ground state energy and the first excited energy. Finally, the calculated results are compared with the experimental data for light nuclei, such as 8Be, 12C and 16O. The results show that the modified Manning-Rosen (MR) potential is adaptable for cluster interactions.

 

Mohammad Reza Shojaei

JJP, 2016, 9(1), 65-70