Open Access Original Research Article

Fe Kα Lines of MCG-6-30-15: Emission from Thin-torus Particles around a Kerr Black Hole

J. Z. G. Ma

Physical Science International Journal, Page 1-11
DOI: 10.9734/PSIJ/2017/30833

We investigate the characteristics of monochromatic particles about a Kerr (rotating) black hole (BH) and their contributions to the observed soft X-ray flux of Fe Kα emission lines. We develop a thin-torus model to formulate the particles which are not restricted within the equatorial plane of the BH, but spherically symmetric and extends to both sides of the equatorial plane due to the gravitational frame-dragging effect. A data-fit modeling to the observed line profile of MCG-6-30-15 indicates that (1) The emission originates from the torus at 13.9 ± 0.05rg (rg is the gravitational radius of the BH) with a polar angle of ∼52.20, instead of from a thin disk in the equatorial plane. (2) In addition to the usually accepted two humps in the observed profile, the blue-shifted one at ∼6.4 keV is caused by prograde particles, and the strongly red-shifted one at ∼4.8 keV by retrograde particles, there exists the third one at ∼5.5 keV. (3) The central BH rotates rapidly with α = 0.96 ± 0.005 (α is the dimensionless specific angular momentum of the BH); (4) Relative to the axis of the BH spin, the inclination angle of observation is 28±0.50.

Open Access Original Research Article

Variability of Horizontal Magnetic Field Intensity from Some Stations within the Equatorial Electrojet Belt

I. A. Adimula, K. T. Gidado, S. A. Bello

Physical Science International Journal, Page 1-8
DOI: 10.9734/PSIJ/2017/25852

The variability of the horizontal component of magnetic field intensity from 7 stations within the Equatorial electrojet (EEJ) belt (±3° of the magnetic equator) has been investigated using year 2008 data measured from the Magnetic Data Acquisition System (MAGDAS) magnetometers. The monthly mean hourly values show variation in the pre-sunrise hours, within the range of 1nT to 21nT. However, dH during the day has a much higher variation than those observed during the pre-sunrise and dusk hours. The presence of Counter electrojet (CEJ) in the morning and evening hours were also observed. Also, equinoctial maximum was observed in most stations, and the horizontal magnetic field intensity over ANC located in the South American sector displays the highest amplitude, while ILR in the African sector appears to have the lowest amplitude.

 

Open Access Original Research Article

On the Gravitational Shielding Phenomenon

Timashev Serge

Physical Science International Journal, Page 1-6
DOI: 10.9734/PSIJ/2017/30140

It is shown that on the basis of previously developed phenomenological ideas about the nature of gravity as a consequence of “Casimir polarization” of electromagnetic component of the physical vacuum (“EM vacuum”) in the vicinity of any material objects, which suggests the existence of shielding of gravitational interactions, one can understand the phenomenon of change of the gravitational acceleration during the total solar eclipse (Allais effect).

 

Open Access Original Research Article

Natural Convective Mass Transfer MHD Flow of Chemically Reactive Micropolar Fluid Past a Vertical Porous Plate

Khan Enaet Hossain, S. M. Maruf Hassan, Syed Auntashire Rahman, Md. Mohidul Haque

Physical Science International Journal, Page 1-11
DOI: 10.9734/PSIJ/2017/27869

Magnetic field effects on a free convective mass transfer flow of chemically reactive micropolar fluid over a vertical porous plate are investigated in this work. Suitable similarity transformations are used to derive a set of nonlinear ordinary differential equations governing the flow. Analytical solution of the dimensionless problem is obtained using perturbation technique. The velocity, angular velocity and concentration profiles, which are controlled by a number of parameters, are presented graphically. Based on these graphs the conclusions are depicted, and the obtained results are tested for their accuracy.

 

Open Access Original Research Article

Finding on the Similarity between the Two Empirical Formulas: Temperature Dependence of Volumetric Expansion of Gas and Temperature Dependence of Resistivity of Conductor

C. G. Sim

Physical Science International Journal, Page 1-6
DOI: 10.9734/PSIJ/2017/30061

This paper finds and examines the similarity between the temperature dependence of volumetric expansion of gases and the temperature dependence of resistance of conductors. In the 1780s, Jacques Charles came to know that the volume of the gas was proportionally increasing as temperature increased. He also stated that the rate of volume expansion was not dependent on the kinds of gases. In the early 19th century, Georg Ohm discovered the electric resistance. It was known that the electric resistivity of conductors changed with temperature. At the room temperature, the measured temperature coefficients of resistance for silver, copper, aluminum and gold are 0.0038, 0.0039, 0.0039 and 0.0034 respectively. When the temperature coefficient, 1/273, in Charles’s law is expressed in a decimal, it indicates 0.0037. The finding of the similarity between the temperature dependence of volumetric expansion of gases and the temperature dependence of resistance of conductors is as follows: first, they have a linear relationship with respect to the temperature change; second, temperature coefficients are very close to each other; third, they are not dependent on the kinds of materials, lastly, the empirical formulas are also convertible each other mathematically. In this study, I here find that there is a similarity between the two empirical formulas. The temperature dependence of atomic vibration is suggested as the cause of the similarity. In addition, it is suggested that the volumetric expansion of gas could be related with the atomic vibration. This finding of similarity will be helpful for our understanding in the features of intrinsic behaviors of a gas molecular motion.

 

Open Access Original Research Article

The Doppler Detection Fault

Kapranov Boris, Sutorikhin Vladimir

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2017/30562

In the study of the interaction of ultrasound with metals discovered an unusual phenomenon. Microwave sensor indicates fluctuations of electric surface conductivity when exposed to elastic ultrasonic vibrations in metal objects. The defective area is characterized by a content of microdefects of the type "the mouth of the cracks". They are known as the field of "acoustic activity" the method of Acoustic Emission (AE). The high coefficient of phase modulation of the reflected field allows you to indicate the Doppler signal is useful for 6-30 dB over the noise from a distance of 70-180 mm. The phenomenon is called "of Gorbunov effect". It has been successfully used as remote non-destructive testing method is ultrasonic methods of flaw detection, acoustic emission. It has been successfully used as remote non-destructive testing method that replaces the ultrasonic methods of flaw detection, acoustic emission.