ON THE CURVATURE FUNCTIONS OF TUBE-LIKE SURFACES IN THE GALILEAN SPACE

Abdel-Aziz, Hossam Eldeen S.,Sorour, Adel H. Korean Mathematical Society 2021 대한수학회논문집 Vol.36 No.3

In the Galilean space G₃, we study a special kind of tube surfaces, called tube-like surfaces. They are defined by sweeping a space curve along another central space curve. In this setting, we investigate some equations in terms of Gaussian and mean curvatures, showing some relevant theorems. Our theoretical results are illustrated with some plotted examples.

SMARANDACHE CURVES OF SOME SPECIAL CURVES IN THE GALILEAN 3-SPACE

ABDEL-AZIZ, H.S.,KHALIFA SAAD, M. The Honam Mathematical Society 2015 호남수학학술지 Vol.37 No.2

In the present paper, we consider a position vector of an arbitrary curve in the three-dimensional Galilean space $G_3$. Furthermore, we give some conditions on the curvatures of this arbitrary curve to study special curves and their Smarandache curves. Finally, in the light of this study, some related examples of these curves are provided and plotted.

Numerical analysis of the attitude stability of a charged spacecraft in the Pitch-Roll-Yaw directions

Abdel-Aziz, Yehia A.,Shoaib, Muhammad The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1

In this paper, the effect of Lorentz force on the stability of attitude orientation of a charged spacecraft moving in an elliptic orbit in the geomagnetic field is considered. Euler equations are used to derive the equations of attitude motion of a charged spacecraft. The equilibrium positions and its stability are investigated separately in the pitch, roll and yaw directions. In each direction, we use the Lorentz force to identify an attitude stabilization parameter. The analytical methods confirm that we can use the Lorentz force as a stabilization method. The charge-to-mass ratio is the main key of control, in addition to the components of the radius vector of the charged center of the spacecraft, relative to the center of mass of the spacecraft. The numerical results determine stable and unstable equilibrium positions. Therefore, in order to generate optimum charge, which may stabilize the attitude motion of a spacecraft, the amount of charge on the surface of spacecraft will need to be monitored for passive control.

Hall-Current Effects on MHD Flow of a Power-Law Fluid over a Rotating Disk

Abdel-Aziz . M. Salem 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.1I

The steady laminar flow of a power-law fluid in the presence of an axial uniform magnetic field is studied in the vicinity of a constantly rotating infinite disk. The Hall current effect is taken into consideration. The incompressible fluid driven by the rotating disk obeys the inelastic Ostwald-de Waele power-law model. The transformed governing equations in the present study were solved numerically by using the Runge-Kutta and Shooting method. Some of the results obtained for a special case of the problem are compared to the results published in a previous work and are found to be in excellent agreement. The effects of the magnetic field M, the Hall current m, and the power-law index n on the velocity profiles, the radial, the tangential skin frictions, and the axial inflow are presented graphically. One valuable important observation is that the effect of the power-law index n is to reduce the effect of both the magnetic field and the Hall current in the boundary-layer’s flow field.

Clinical Significance of Serum p53 and Epidermal Growth Factor Receptor in Patients with Acute Leukemia

Abdel-Aziz, Mohamed Mohamed Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.7

Background: Pretreatment serum p53 and epidermal growth factor receptor (EGFR) were assessed using enzyme-linked immunosorbent assay (ELISA) in patients with acute leukemia to analysis their roles in characterization of different subtypes of the disease. Materials and Methods: Serum samples from thirty two patients with acute myeloid leukemia (AML) and fourteen patients with acute lymphoid leukemia (ALL) were analysed, along with 24 from healthy individuals used as a control group. Results: The results demonstrated a significant increase of serum p53 and EGFR in patients with AML (p<0.0001) compared to the control group. Also, the results showed a significant increase of both markers in patients with ALL (p<0.05, p<0.0001 respectively). Sensitivities and specificities for these variables were 52% and 100% for p53, and 73.9%, 95.8% for EGFR. Serum p53 and EGFR could successfully differentiate between M4 and other AML subtypes, while these variables failed to discriminate among ALL subtypes. A positive significant correlation was noted between p53 and EGFR. Negative significant correlations were observed between these variables and both of hemoglobin (Hg) content and RBC count. Conclusions: Mutant p53 and EGFR are helpful serological markers for diagnosis of patients with AML or ALL and can aid in characterization of disease. Moreover, these markers may reflect carcinogenesis mechanisms.

Earthquake source characterization, moment tensor solutions, and stress field of small–moderate earthquakes occurred in the northern Red Sea Triple Junction

Abdel-aziz Khairy Abdel-aal,Yuji Yagi 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.2

We estimated moment tensor and centroid depth of eight small/moderate local earthquakes occurred between 2011 and 2013 in the northern Red Sea Triple Junction using a moment tensor inversion of near-source waveform data recorded by very broadband stations of the Egyptian National Seismic Network (ENSN). We also estimated the focal mechanism using the P-wave polarity data set and then compared it with the moment tensor inversion results. The moment tensor solutions are consistent with the focal mechanism obtained from the P-wave polarity data. We also estimated the stress field in the study area using the Multiple Inverse Method (MIM). Our results indicate that the axis of the minimum principal stress is a nearly horizontal NE-SW direction, while the axis of the maximum principal stress is nearly vertical. The direction of the minimum principal stress is consistent with the opening direction of the northern Red Sea zone, where the southern part of Gulf of Suez is currently under an extensional stress field with a NE-SW trending horizontal extension. These results are compatible with the kinematics of the Red Sea-Gulf of Suez rift.

New Synthesis of Chromonopyrroloimidazolinones and Arylidene Thioxoimidazolinones -Study of their antimicrobial activities-

Abdel Aziz, Mahfouz A.,Riad, Bahia Y.,Shalaby, A.M. The Pharmaceutical Society of Korea 1989 Archives of Pharmacal Research Vol.12 No.1

6-Formyl-5-methoxy-2-methyl chromone derivatives condensed with 2-thiox-4-imidazolinone derivatives to form the corresponding '10-methoxy-7-methyl-3-thioxo-chromone[6,7-b]pyrrolo[1,2-a-]-imidazolin-1-one derivatives (IIIa-f) or the 5-arvlidene-2-thioxo-4-imidazolinone derivatives(IVa-f). The activity of the NH in the imidazol moiety of (IIIa) was confirmed by formation of the Mannich bases (Va, b). Moreover, alkylation of (IIIa) was undertaken to give the alkylmercapto derivatives (VIa, b). The antimicrobial activities of compounds IIIb-e, IVa, IVe were studied.

A Self-Consistent Semi-Analytical Model for AlGaAs/InGaAs PMHEMTs

Abdel Aziz, M.,El-Banna, M.,El-Sayed, M. The Institute of Electronics and Information Engin 2002 Journal of semiconductor technology and science Vol.2 No.1

A semi-analytical model based on exact numerical analysis of the 2DEG channel in pseudo-morphic HEMT (PMHEMT) is presented. The exactness of the model stems from solving both Schrodinger's wave equation and Poisson's equation simultaneously and self-consistently. The analytical modeling of the device terminal characteristics in relation to the charge control model has allowed a best fit with the geometrical and structural parameters of the device. The numerically obtained data for the charge control of the channel are best fitted to analytical expressions which render the problem analytical. The obtained good agreement between experimental and modeled current/voltage characteristics and small signal parameters has confirmed the validity of the model over a wide range of biasing voltages. The model has been used to compare both the performance and characteristics of a PMHEMT with a competetive HEMT. The comparison between the two devices has been made in terms of 2DEG density, transfer characteristics, transconductance, gate capacitance and unity current gain cut-off frequency. The results show that PMHEMT outperforms the conventional HEMT in all considered parameters.

Aggressive Treatment of Performance Status 1 and 2 HCC Patients Significantly Improves Survival - an Egyptian Retrospective Cohort Study of 524 Cases

Aziz, Ashraf Omar Abdel,Omran, Dalia,Nabeel, Mohamed Mahmoud,Elbaz, Tamer Mahmoud,Abdelmaksoud, Ahmed Hosni,Attar, Inas El,Shousha, Hend Ibrahim Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5

Background: In the Barcelona Clinic Liver Cancer (BCLC) system, only sorafenib is suggested for HCC patients having performance status (PS) 1 or 2 even if they have treatable lesions. In the current study, we aimed to explore the outcome of using aggressive treatment for HCC patients with PS 1 and 2. Materials and Methods: Five hundred and twenty four patients with HCC were enrolled in this study and divided into 2 groups: 404 PS 1 and 120 PS 2. Of the included 524 patients, 136 recceived non-aggressive supportive treatment and sorafenib, while 388 patients were offered aggressive treatment in the form of surgical resection, transplantation, percutaneous ablation, trans-arterial chemoembolization and/or chemoperfusion. All the patients were followed up for a period of 2 years to determine their survival. Results: Most HCC patients were CHILD A and B grades (89.4% versus 85.0%, for PS1 and PS2, respectively). Patients with PS1 were significantly younger. Out of the enrolled 524 patients, 388 were offered aggressive treatment, 253 (65.2%) having their lesions fully ablated, 94 (24.2%) undergoing partial ablation and 41 patients with no ablation (10.6%). The median survival of the patients with PS 1 who were offered aggressive treatment was 20 months versus 9 months only for those who were offered supportive treatment and sorafenib (p<0.001). Regarding HCC patients with PS 2, the median survivals were similarly 19.7 months versus 8.7 months only (p<0.001). Conclusions: Aggressive treatment of HCC patients with PS 1 and 2 significantly improves their survival. Revising the BCLC guidelines regarding such patients is recommended.

Taxonomic implications of multivariate analyses of Egyptian Ononis L. (Fabaceae) based on morphological traits

Abdel Aziz A. Fayed,Azza M. H. El-Hadidy,Ahmed M. Faried,Asmaa O. Olwey 한국식물분류학회 2019 식물 분류학회지 Vol.49 No.1

Numerical taxonomy is employed to determine the phenetic proximity of the Egyptian taxa belong- ing to the genus Ononis L. A classical clustering analysis and a principal component analysis (PCA) were used to separate 57 macro- and micromorphological characters in order to circumscribe 11 taxa of Ononis. A clus- tering analysis using the unweighted pair-group method with the arithmetic means (UPGMA) method gives the highest co-phenetic correlation. Results from clustering and PCA revealed the segregation of five groups. Our results are in line, to some certain degree, with the traditional sub-sectional concept, as can be seen in the group- ing of the representative members of the subsections Diffusae and Mittisimae together and the representative members of the subsections Viscosae and Natrix. The phenetic uniqueness of Ononis variegata and O. reclinata subsp. mollis was formally established. However, our findings contradict the classic sectional concept; this opin- ion was suggested earlier in previous phylogenetic circumscriptions of the genus. The most useful characters that provide taxonomic clarity were discussed.