Al Badawi - Academia.edu (original) (raw)
Papers by Al Badawi
The European Physical Journal Plus, 2020
We study the timelike geodesics and the greybody radiation of the Schwarzschild black hole surrou... more We study the timelike geodesics and the greybody radiation of the Schwarzschild black hole surrounded by quintessence field. Quintessence field is one of the highly plausible models for the dark energy. The effective potential along with the structure of the possible orbits for test particles in view of the various values of quintessence parameter are analyzed in detail. The exact solution of radial timelike geodesics for a test particle is obtained. Remarkably, it is shown that an increase in quintessence parameter decelerates the particles following the radial timelike geodesics so that the particles reach the singularity slower than the bare Schwarzschild case. The circular orbits of the test particles in case of non-radial geodesics are studied. We also discuss the Lyapunov exponent and the effective force acting on the particle in the presence of quintessence field. The effect of quintessence parameter on the greybody factor is also investigated. We consider the Miller–Good transformation method to compute the greybody factor and therefore to discuss how the Hawking radiation is affected from the quintessence field.
Sohag Medical Journal, 2018
Background and aim: Thrombocytopenia is a common complication of chronic liver diseases and is du... more Background and aim: Thrombocytopenia is a common complication of chronic liver diseases and is due to various causes.The effect of thrombocytopenia on liver damage and the exact mechanisms that lead to thrombocytopenia in chronic liver disease and cirrhosis are still unclear. As Platelets Derived Growth Factor ß (PDGF-ß) is released from platelets (PLTs) upon activation. We tried to identify PLTs and PDGFR-ß in the liver to shed some light on the pathophysiology of thrombocytopenia and liver fibrosis in chronic hepatic C patients. Patients and Methods: Analytical cross-sectional study was conducted on fifty patients with proven chronic hepatitis C. All patients were referred to Tropical Medicine and Gastroenterology Department, Sohag University Hospital. Patients were categorized into two groups. Group 1 includes patients with PLT count less than 150000/µL (thrombocytopenia). Group 2 includes patients with normal PLT count (150000-450000/µL). All patients were subjected to full history taking, complete clinical examination, complete blood count, liver function tests. Liver biopsy was obtained for histological staging and grading. Immunohistochemical study of PLTs and PDGFR-ß were done using monoclonal antibodies against PLT's surface marker CD41 and PDGFR-ß. Results: The included patients were 80 % males and 20 % females. Their mean age was 44.42± 11.17 years. The mean average weighted score (AWS) of Imunohisto-chemical expression of CD41was significantly higher in thrombocytopenic group compared to normal PLTs group (5.8±2.86 vs 3.43±3.03; P<0.001). There was a significant negative correlation between CD41 expression and peripheral PLT count (r=-0.4; P=0.007). PDGFR-ß expression was significantly stronger in thrombocytopenic patients than patients with normal PLT count (6.9±3.6 vs 5.27±3.92; P=0.001). It showed also a significant negative correlation with peripheral PLT count (r=-0.34, P=0.045). Both CD41 and PDGFR-ß expression were significantly elevated in patients with advanced stage of fibrosis than in those with earlier stages (7.26±5.23 vs 5.88±3.24; P=0.04 &9.2±2.7 vs 6.7±3.6; P<0.01 respectively). Conclusion: The accumulation of PLTs in the liver in patients with chronic hepatitis C may be involved in thrombocytopenia and liver fibrosis.
International Journal of Geometric Methods in Modern Physics, 2018
We study the Dirac and the chargeless Klein–Gordon–Fock equations in the geometry of Grumiller’s ... more We study the Dirac and the chargeless Klein–Gordon–Fock equations in the geometry of Grumiller’s spacetime that describes a model for gravity of a central object at large distances. The Dirac equation is separated into radial and angular equations by adopting the Newman–Penrose formalism. The angular part of the both wave equations are analytically solved. For the radial equations, we managed to reduce them to one dimensional Schrödinger-type wave equations with their corresponding effective potentials. Fermions’s potentials are numerically analyzed by serving their some characteristic plots. We also compute the quasinormal frequencies of the chargeless and massive scalar waves. With the aid of those quasinormal frequencies, Bekenstein’s area conjecture is tested for the Grumiller black hole. Thus, the effects of the Rindler acceleration on the waves of fermions and scalars are thoroughly analyzed.
International Journal of Modern Physics D, 2017
The geodesic equations are considered in a spacetime that represents a Schwarzschild metric coupl... more The geodesic equations are considered in a spacetime that represents a Schwarzschild metric coupled to a uniform external electromagnetic (em) field. Due to the em field horizon shrinks and geodesics are modified. By analyzing the behavior of the effective potentials for the massless and massive particle we study the radial and circular trajectories. Radial geodesics for both photons and particles are solved exactly. It is shown that a particle that falls toward the horizon in a finite proper time slows down so that the particle reaches the singularity slower than Schwarzschild case. Timelike and null circular geodesics are investigated. We have shown that, there are no stable circular orbits for photons, however stable and unstable second-kind orbits exist for the massive particle. An exact analytical solution for the innermost stable circular orbits (ISCO) has been obtained. It has been shown that the radius of the ISCO shrinks due to the presence of the em field.
Il Nuovo Cimento B
ABSTRACT
Journal of Animal and Plant Sciences
The objective of this study was to assess salivary and plasma cortisol levels and their correlati... more The objective of this study was to assess salivary and plasma cortisol levels and their correlation in Aardi goats subjected to transportation. Twenty-seven (27) healthy male goats were used in this experiment. The goats were transported for 240 km for 3 hrs, and 480 km for 6 hours, Blood and saliva samples were collected at 0.00 h (pre-transportation); at 30, 60, 120, 240 min and 24 hrs post transportation. Both distances resulted in statistically significantly (P < 0.0001) increase in cortisol plasma and salivary levels after the transportation. The correlation coefficient between saliva and plasma cortisol was 0.895. The current findings indicated that transportation is a stress challenge in Aardi goat, and salivary levels of cortisol reflect its concentration in plasma samples of Aardi goat.
IFMBE Proceedings, 2008
... Cestodes (Tapeworms), (1998) Author: Dr. Sudhir Kumar Sharma Institute: University of Medical... more ... Cestodes (Tapeworms), (1998) Author: Dr. Sudhir Kumar Sharma Institute: University of Medical Sciences and Technology Street: Khartoum City: Khartoum Country: Sudan Email: sudhir.732000@gmail.com Table 1. Taeina ...
arpapress.com
... ISPA 2003. [8]. Amos Omondi and Benlamin Premkumar, Residue Number Susyem Theory and Implemen... more ... ISPA 2003. [8]. Amos Omondi and Benlamin Premkumar, Residue Number Susyem Theory and Implementation, Imperial College Press, 2007, pp. 1-134. ... [10]. Mary Jane Irwin, Computer Arithmetic, ”www.cse.psu.edu/ mji”s, Spring, 2005, CSE 575. [11]. ...
General Relativity and Gravitation, 2006
Exact interpretation of the NUT parameter becomes possible when a static Schwarzchild mass is imm... more Exact interpretation of the NUT parameter becomes possible when a static Schwarzchild mass is immersed in a stationary, source free electromagnetic universe. We explain this on the basis of our solution (Halilsoy and Al-Badawi in Class Quantum Grav 12:3013, 1995), which represents the non-linear superposition of the Schwarzschild solution and the generalized Bertotti-Robinson solution.
Classical and Quantum Gravity, 1995
ABSTRACT
Canadian Journal of Physics, 2010
The problem of a charged Dirac particle crossing a gravitational electromagnetic wave of finite d... more The problem of a charged Dirac particle crossing a gravitational electromagnetic wave of finite duration in general relativity is considered in this paper. The set of equations representing the Dirac equation in the Newman–Penrose formalism is solved exactly. It is shown that the Dirac particle crossing such a wave emerges with amplified energy.
Canadian Journal of Physics, 2009
Exact solutions of a massive complex scalar field equation in the geometry of a Garfinkle–Horowit... more Exact solutions of a massive complex scalar field equation in the geometry of a Garfinkle–Horowitz–Strominger (stringy) black hole with magnetic charge is explored. The separated radial and angular parts of the wave equation are solved exactly in the nonextreme case. The angular part is shown to be an ordinary spin-weighted spheroidal harmonics with a spin-weight depending on the magnetic charge. The radial part is achieved to reduce a confluent Heun equation with a multiplier. Finally, based on the solutions, it is shown that the Hawking temperature of the magnetically charged stringy black hole has the same value as that of the Schwarzschild black hole.
American Journal of Applied Sciences, 2006
We have obtained the exact solution of the equations of motion of a test particle near a thick do... more We have obtained the exact solution of the equations of motion of a test particle near a thick domain walls for the case of Ricci tensor R ab = 0. From the solution it has been shown that the domain walls have repulsive gravitational fields.
Physics Letters B, 2010
ABSTRACT
The European Physical Journal Plus, 2020
We study the timelike geodesics and the greybody radiation of the Schwarzschild black hole surrou... more We study the timelike geodesics and the greybody radiation of the Schwarzschild black hole surrounded by quintessence field. Quintessence field is one of the highly plausible models for the dark energy. The effective potential along with the structure of the possible orbits for test particles in view of the various values of quintessence parameter are analyzed in detail. The exact solution of radial timelike geodesics for a test particle is obtained. Remarkably, it is shown that an increase in quintessence parameter decelerates the particles following the radial timelike geodesics so that the particles reach the singularity slower than the bare Schwarzschild case. The circular orbits of the test particles in case of non-radial geodesics are studied. We also discuss the Lyapunov exponent and the effective force acting on the particle in the presence of quintessence field. The effect of quintessence parameter on the greybody factor is also investigated. We consider the Miller–Good transformation method to compute the greybody factor and therefore to discuss how the Hawking radiation is affected from the quintessence field.
Sohag Medical Journal, 2018
Background and aim: Thrombocytopenia is a common complication of chronic liver diseases and is du... more Background and aim: Thrombocytopenia is a common complication of chronic liver diseases and is due to various causes.The effect of thrombocytopenia on liver damage and the exact mechanisms that lead to thrombocytopenia in chronic liver disease and cirrhosis are still unclear. As Platelets Derived Growth Factor ß (PDGF-ß) is released from platelets (PLTs) upon activation. We tried to identify PLTs and PDGFR-ß in the liver to shed some light on the pathophysiology of thrombocytopenia and liver fibrosis in chronic hepatic C patients. Patients and Methods: Analytical cross-sectional study was conducted on fifty patients with proven chronic hepatitis C. All patients were referred to Tropical Medicine and Gastroenterology Department, Sohag University Hospital. Patients were categorized into two groups. Group 1 includes patients with PLT count less than 150000/µL (thrombocytopenia). Group 2 includes patients with normal PLT count (150000-450000/µL). All patients were subjected to full history taking, complete clinical examination, complete blood count, liver function tests. Liver biopsy was obtained for histological staging and grading. Immunohistochemical study of PLTs and PDGFR-ß were done using monoclonal antibodies against PLT's surface marker CD41 and PDGFR-ß. Results: The included patients were 80 % males and 20 % females. Their mean age was 44.42± 11.17 years. The mean average weighted score (AWS) of Imunohisto-chemical expression of CD41was significantly higher in thrombocytopenic group compared to normal PLTs group (5.8±2.86 vs 3.43±3.03; P<0.001). There was a significant negative correlation between CD41 expression and peripheral PLT count (r=-0.4; P=0.007). PDGFR-ß expression was significantly stronger in thrombocytopenic patients than patients with normal PLT count (6.9±3.6 vs 5.27±3.92; P=0.001). It showed also a significant negative correlation with peripheral PLT count (r=-0.34, P=0.045). Both CD41 and PDGFR-ß expression were significantly elevated in patients with advanced stage of fibrosis than in those with earlier stages (7.26±5.23 vs 5.88±3.24; P=0.04 &9.2±2.7 vs 6.7±3.6; P<0.01 respectively). Conclusion: The accumulation of PLTs in the liver in patients with chronic hepatitis C may be involved in thrombocytopenia and liver fibrosis.
International Journal of Geometric Methods in Modern Physics, 2018
We study the Dirac and the chargeless Klein–Gordon–Fock equations in the geometry of Grumiller’s ... more We study the Dirac and the chargeless Klein–Gordon–Fock equations in the geometry of Grumiller’s spacetime that describes a model for gravity of a central object at large distances. The Dirac equation is separated into radial and angular equations by adopting the Newman–Penrose formalism. The angular part of the both wave equations are analytically solved. For the radial equations, we managed to reduce them to one dimensional Schrödinger-type wave equations with their corresponding effective potentials. Fermions’s potentials are numerically analyzed by serving their some characteristic plots. We also compute the quasinormal frequencies of the chargeless and massive scalar waves. With the aid of those quasinormal frequencies, Bekenstein’s area conjecture is tested for the Grumiller black hole. Thus, the effects of the Rindler acceleration on the waves of fermions and scalars are thoroughly analyzed.
International Journal of Modern Physics D, 2017
The geodesic equations are considered in a spacetime that represents a Schwarzschild metric coupl... more The geodesic equations are considered in a spacetime that represents a Schwarzschild metric coupled to a uniform external electromagnetic (em) field. Due to the em field horizon shrinks and geodesics are modified. By analyzing the behavior of the effective potentials for the massless and massive particle we study the radial and circular trajectories. Radial geodesics for both photons and particles are solved exactly. It is shown that a particle that falls toward the horizon in a finite proper time slows down so that the particle reaches the singularity slower than Schwarzschild case. Timelike and null circular geodesics are investigated. We have shown that, there are no stable circular orbits for photons, however stable and unstable second-kind orbits exist for the massive particle. An exact analytical solution for the innermost stable circular orbits (ISCO) has been obtained. It has been shown that the radius of the ISCO shrinks due to the presence of the em field.
Il Nuovo Cimento B
ABSTRACT
Journal of Animal and Plant Sciences
The objective of this study was to assess salivary and plasma cortisol levels and their correlati... more The objective of this study was to assess salivary and plasma cortisol levels and their correlation in Aardi goats subjected to transportation. Twenty-seven (27) healthy male goats were used in this experiment. The goats were transported for 240 km for 3 hrs, and 480 km for 6 hours, Blood and saliva samples were collected at 0.00 h (pre-transportation); at 30, 60, 120, 240 min and 24 hrs post transportation. Both distances resulted in statistically significantly (P < 0.0001) increase in cortisol plasma and salivary levels after the transportation. The correlation coefficient between saliva and plasma cortisol was 0.895. The current findings indicated that transportation is a stress challenge in Aardi goat, and salivary levels of cortisol reflect its concentration in plasma samples of Aardi goat.
IFMBE Proceedings, 2008
... Cestodes (Tapeworms), (1998) Author: Dr. Sudhir Kumar Sharma Institute: University of Medical... more ... Cestodes (Tapeworms), (1998) Author: Dr. Sudhir Kumar Sharma Institute: University of Medical Sciences and Technology Street: Khartoum City: Khartoum Country: Sudan Email: sudhir.732000@gmail.com Table 1. Taeina ...
arpapress.com
... ISPA 2003. [8]. Amos Omondi and Benlamin Premkumar, Residue Number Susyem Theory and Implemen... more ... ISPA 2003. [8]. Amos Omondi and Benlamin Premkumar, Residue Number Susyem Theory and Implementation, Imperial College Press, 2007, pp. 1-134. ... [10]. Mary Jane Irwin, Computer Arithmetic, ”www.cse.psu.edu/ mji”s, Spring, 2005, CSE 575. [11]. ...
General Relativity and Gravitation, 2006
Exact interpretation of the NUT parameter becomes possible when a static Schwarzchild mass is imm... more Exact interpretation of the NUT parameter becomes possible when a static Schwarzchild mass is immersed in a stationary, source free electromagnetic universe. We explain this on the basis of our solution (Halilsoy and Al-Badawi in Class Quantum Grav 12:3013, 1995), which represents the non-linear superposition of the Schwarzschild solution and the generalized Bertotti-Robinson solution.
Classical and Quantum Gravity, 1995
ABSTRACT
Canadian Journal of Physics, 2010
The problem of a charged Dirac particle crossing a gravitational electromagnetic wave of finite d... more The problem of a charged Dirac particle crossing a gravitational electromagnetic wave of finite duration in general relativity is considered in this paper. The set of equations representing the Dirac equation in the Newman–Penrose formalism is solved exactly. It is shown that the Dirac particle crossing such a wave emerges with amplified energy.
Canadian Journal of Physics, 2009
Exact solutions of a massive complex scalar field equation in the geometry of a Garfinkle–Horowit... more Exact solutions of a massive complex scalar field equation in the geometry of a Garfinkle–Horowitz–Strominger (stringy) black hole with magnetic charge is explored. The separated radial and angular parts of the wave equation are solved exactly in the nonextreme case. The angular part is shown to be an ordinary spin-weighted spheroidal harmonics with a spin-weight depending on the magnetic charge. The radial part is achieved to reduce a confluent Heun equation with a multiplier. Finally, based on the solutions, it is shown that the Hawking temperature of the magnetically charged stringy black hole has the same value as that of the Schwarzschild black hole.
American Journal of Applied Sciences, 2006
We have obtained the exact solution of the equations of motion of a test particle near a thick do... more We have obtained the exact solution of the equations of motion of a test particle near a thick domain walls for the case of Ricci tensor R ab = 0. From the solution it has been shown that the domain walls have repulsive gravitational fields.
Physics Letters B, 2010
ABSTRACT