ORIGINAL_ARTICLE
AN INVESTIGATION OF 6HE+12C ELASTIC SCATTERING USING MICROSCOPIC CLUSTER MODEL
In the frame work of the cluster folding model, for the first time, the 6He+12C real folded potentials are derived using newforms of the nuclear matter density of 6He nucleus based on α+2n or di-triton configurations. The angular distributions ofthe elastic scattering differential cross section at energies 38.3,41.6 and 82.3 MeV/nucleon are reexamined using the generatedpotentials. Comparisons between the extracted and measured angular distributions of the differential cross sections arepresented. Satisfactory reproduction of the data is extracted by using the square Woods-Saxon (WS2) form instead of the usualWS shape without need to renormalize the derived potentials. The resulted reaction cross sections are also investigated andcompared with the optical limit Glauber model predictions.
https://absb.journals.ekb.eg/article_22602_a2a72e3bd5bbb418686bbe4b306892d6.pdf
2014-06-01
1
8
10.21608/absb.2014.22602
optical model
Elastic scattering
Halo nuclei
folding model, Glauber model
Awad
Ibraheem
1
Physics Department, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt
LEAD_AUTHOR
ORIGINAL_ARTICLE
TESTING EXPONENTIALITY AGAINST EXPONENTIAL BETTER THAN USED IN LAPLACE TRANSFORM ORDER BASED ON GOODNESS OF FIT APPROACH
In this paper, test statistic for testing exponentiality versus exponential better than used in Laplace transform order basedon goodness of fit approach is discussed. Pitman’s asymptotic efficiencies of our test are calculated and compared with othertests. The percentiles of this test are tabulated. The powers of the test are estimated for famously used distributions in agingproblems. In case of censored data our test is applied and the percentiles are calculated and tabulated. Finally, examples indifferent fields are used as practical applications for the proposed test.
https://absb.journals.ekb.eg/article_22636_061270e3c59edd5f1841ed87da6eefd8.pdf
2014-06-01
1
6
10.21608/absb.2014.22636
Goodness of fit
censored data
Monte Carlo simulation
EBUL
Mahmoud
M. A. W.
1
Departments of Mathematics, Faculty of Science, Al-Azhar University, Nasr City
LEAD_AUTHOR
Abdul Alim
N. A.
2
Basic Science, Faculty of Engineering, The British University in Egypt, Elshrouk City, Cairo, Egypt.
AUTHOR
Mansour
M. M. M.
3
Faculty of Engineering, The British University in Egypt, Elshrouk City, Cairo, Egypt.
AUTHOR
ORIGINAL_ARTICLE
THERMAL-PROCESSING OF CARBON DUST AROUND A COOL STAR
Thermal-processed carbonaceous materials could emulate the evolution of the carbonaceous dust which settles inregions around a cool star in a proto-planetary nebula (PPN). Spectroscopically, this evolution has been shown through thevariation in the strength of the aliphatic (-C-H stretching mode at the 3.42 μm) band relative to those of the aromatic (=C-Hmode at the 3.3 μm) band. Experimentally, the laser ablation technique was used to produce the Hydrogenated AmorphousCarbon (HAC) samples as analogs of comic carbon dust. The IR-laboratory data of these samples shows that the strength ofthese two bands varies reversely to each other as HAC transforms from the aliphatic to aromatic structure with heating. Thetemperature, required to cause this transformation within HAC, depends on its hydrogen content. Hence, the trend of this variationis also in relevance to the hydrogen content within HAC. This trend shows the variation from the aliphatic to aromaticstructure in dust grains in regions within the PPN IRAS 22272+5435. In which, it is expected that dust grains may be heatedin the past in the warm region near the star.
https://absb.journals.ekb.eg/article_22659_eaac2dafb3900000de6d7da548971320.pdf
2014-06-01
1
6
10.21608/absb.2014.22659
Comic carbon dust
IR spectroscopy
Planetary nebulae
Gadallah
K. A. K.
1
Department of Astronomy & Meteorology, Faculty of Science, Al-Azhar University, Nasr City
LEAD_AUTHOR
ORIGINAL_ARTICLE
STUDYING STABILITY OF THE LIBERATION POINTS OFBINARY ASTEROIDES
In this study, the locations of the equilibrium points of both triangular and collinear of restricted three-body problem andtheir stabilities are studied.This study was applied on ten binary asteroids. A code was constructed by MATHEMATICA languageto obtain liberation points and their stabilities.On the other hand, the contour of zero velocity curves was displayed for two stable and unstable binaries.
https://absb.journals.ekb.eg/article_22661_1e945b621a9a72bab8f2a39a87483dfa.pdf
2014-06-01
7
14
10.21608/absb.2014.22661
binary asteroids
liberation points
stability
Ismail
M.N
1
1Astronomy and Metrology Department Faculty of Science, Al-Azhar University, Egypt
LEAD_AUTHOR
Bakry
A.
2
Astronomy and Metrology Department Faculty of Science, Al-Azhar University, Egypt.
AUTHOR
Khalil
Kh.I.
3
Solar and Space Research Department, NationalResearch Institute of Astronomy and Geophysics (NRIAG)
AUTHOR
Hafez
A.
4
Solar and Space Research Department, NationalResearch Institute of Astronomy and Geophysics (NRIAG)
AUTHOR
ORIGINAL_ARTICLE
PREDICTION OF THE ORBITAL MOTION OF AN ARTIFICIAL SATELLITE FROM RADAR MEASUREMENTS
This paper presents the good prediction of motion an artificial satellite using radar data under perturbation forces, theperturbed J4 Earth’s gravity and the atmospheric drag with the best atmospheric density model which depends on both Sunmagnetic field and solar activity.To propagate the orbit, we have to determine the initial conditions by using at least three different values of range and theircorresponding values of azimuth and elevation angles for radar data. The differential equations of satellite motion are solvedusing Runge-Kutta method of the fourth order with application on the radar data of EGYPTSAT-1.
https://absb.journals.ekb.eg/article_22666_e71d7d5cd079d3d61579144f137ab4c0.pdf
2014-06-01
15
20
10.21608/absb.2014.22666
PREDICTION OF THE ORBITAL MOTION
A. Awad
Mervat
1
Faculty of Science - Cairo University
LEAD_AUTHOR
Mahmoud
M.K.
2
Faculty of Science - Cairo University
AUTHOR
Habib
T.M.A.
3
National authority for Remote Sensing &space sciences, Egypt
AUTHOR
Mohamed
A.H.
4
National authority for Remote Sensing &space sciences, Egypt
AUTHOR
ORIGINAL_ARTICLE
APPROXIMATE SOLUTION TO THE PROBLEM OF TORSION OF AN IN NITE ELASTIC ROD OF NORMAL CROSS-SECTION IN THE FORM OF A NEPHROID BY A BOUNDARY INTEGRAL METHOD
The torsion of a long elastic bar possessing a normal cross-section bounded by a nephroid is considered by means of anexpansion in polar harmonics, in conjunction with boundary collocation method and the boundary representation of harmonicfunctions.Three types of nephroids are investigated and comparison is carried out between all three cases in what concerns the e¢ciency of the used method.The results are illustrated in three-dimensional plots of the unknown functions of practical interest.
https://absb.journals.ekb.eg/article_22672_3dae1f5ceca095e47d4b6890c17f3b5c.pdf
2014-06-01
7
16
10.21608/absb.2014.22672
Theory of elasticity
plane elasticity
torsion of prismatic rods
boundary integral method
numerical solution
collocation method
Sheshtawy
S.M.
1
Departments of Mathematics, Faculty of Science, Al-Azhar University
LEAD_AUTHOR
Ghaleb
A. F.
2
Departments of Mathematics, Faculty of Science, Cairo University
AUTHOR