Author: Mustafa Mohammad Al-Zyout, Published Year: 2010
Astrophysics, 53
Faculty: Science

Abstract: The properties of a sample of extragalactic OH maser sources over a wide spectral range are discussed. Based on a sample of 22 maser galaxies it is shown that OH, HCN, and x-ray emission are closely related. On the other hand, these emissions depend on the mass of the galactic nucleus. It is shown that the broadening of the OH emission line is caused by the rotation of the circumnuclear disk, dense regions of which serve as the sources of OH and HCN emission. X-ray heating can excite OH and HCN molecules.

Keywords: masers- galaxies: molecules- galaxies: x-ray emission

Author: Mustafa Mohammad Al-Zyout, Published Year: 2010
Faculty: Science

Abstract: The properties of a sample of extragalactic H2O maser sources over a wide spectral range are discussed. Based on a sample of 81 maser galaxies it is shown that mega- and kilomasers have completely different properties. In particular, for megamasers the strongest observed relationships are between the parameters of the H2O line and the mass of the galactic nucleus, while the parameters of the line are uncorrelated with the x-ray, infrared, and radio emission. A weak correlation between megamaser emission and the surface (column) density of hydrogen is observed. As for kilomasers, their H2O luminosity depends weakly on the x-ray emission, although in the case of soft x rays this dependence is significant. The H2O luminosity of kilomasers is moderately correlated with the infrared and radio continuum luminosities, but the line parameters are independent of the mass of the nucleus and the surface density of hydrogen.

Keywords: maser-galaxies: active galaxies: galaxies with active star formation

Research Title: البنية التصميمية ودورها في تطوير العملية التفاعلية لتطبيقات الهواتف الذكية (القطاع السياحي الأردني أنموذجاً)
Author: Mahmod Saeed Jrarwa, Published Year: 2019
Faculty: Arts

Abstract: هدفت الدراسة الى معرفة دور البنية التصميمية في تطوير العملية التفاعلية في تطبيقات الهواتف الذكية الخاصة بالقطاع السياحي الأردني، وذلك من خلال دراسة تحليلية للعناصر التصميمية وتحديد الأنماط التصميمية التفاعلية وأثرها على المستخدم، لتطوير اسلوب تصميمي يعتمد على أسس التصميم الجرافيكي الصحيح، كما وتأتي أهمية هذه الدراسة بكيفية طرح أسس مرجعية يعتمد عليها الأفراد والمؤسسات والشركات التصميمية المتخصصة للخروج بتطبيقات ذات مواصفات تصميمية عالية تنافس التطبيقات العالمية، فضلاً عن المؤسسات الأكاديمية ذات العلاقة بالتخصص. ولتحقيق اهداف الدراسة اعتمد الباحث المنهج الوصفي التحليلي لعمل دراسة تحليلية لثلاثة تطبيقات تم اختيارها لتمثيل عينة البحث المتمثلة في (تطبيقات الهواتف الذكية الخاصة بالقطاع السياحي الأردني)، بالإضافة إلى إستخدام المنهج التطبيقي لإيجاد حلول تصميمية عن طريق إعادة تصميم تطبيق (Visit Petra) وعمل نماذج أولية له بنائاً على الأسس التصميمية ووفق المنظومة التصميمية الخاصة بنظام التشغيل iOS)). ومن أبرز النتائج التي توصلت إليها هذه الدراسة أن بناء تطبيقات ذات جودة تصميمية عالية يعتمد على مدى تطبيق وإلتزام المصممين بالمنظومة التصميمية الخاصة بأنظمة التشغيل، كما أكدت الدراسة على الدور الذي تلعبة عناصر البناء التصميمية في تطوير العملية التفاعلية في تطبيقات الهواتف الذكية. وتوصلت الدراسة إلى عدة توصيات من أبرزها أنه يجب الإعتماد على الفكر التصميمي الحديث ومواكبة التطور السريع والمستمر في تصميم تطبيقات الهواتف الذكية للخروج بتطبيقات تتلائم ومتطلبات العصر في مجال القطاع السياحي الأردني، وقد أوصت الدراسة على الإهتمام بتقنيات الإظهار المستخدمة في تصميم تطبيقات الهواتف الذكية، وهذا ما توفره برامج التصميم الخاصة إذ انها تعتبر العنصر الأساسي في التصميم.

Keywords: تصميم، تفاعل، تطبيقات هواتف ذكية، تجربة مستخدم، واجهة مستخدم، أنماط تفاعل

Research Title: Kinetics of oxidation of aspirin by Ce(IV) in surfactant, polymer, and mixed surfactant-polymer media
Author: Mohammed Hassan Ali Saleh, Published Year: 2021
Colloid and Polymer Science , 299
Faculty: Science

Abstract: The catalytic effects of the two surfactants, sodium dodecyl sulfate (SDS) and dimethyldodecylammonium oxide (DDAO), and the two polymers polyethylene glycol (PEG) and polyvinylpyrrolidone (PVD), on the kinetics of oxidation of Aspirin by Ce(IV) were investigated. Mixed systems of the two surfactants and SDS-PEG/PVD were also examined as catalysts of the reaction. Both surfactants catalyzed the reaction, but the DDAO was found to work only above its critical micelle concentration (CMC), whereas below it a precipitate appeared and retarded the measurements. The catalytic profiles of both surfactants showed maxima, which enabled the application of Piszkiewicz’s model to calculate the cooperative index (n) and dissociation constants (kD) of premicellar substrate-surfactant aggregates. Besides, less values of dissociation constant and a higher value of n were found for DDAO compared to those of SDS. The results proved higher catalytic activity of DDAO because the SDS counter ions may impose some restriction on Ce(IV) diffusion toward the substrate solubilized within the micellar core. Both polymers, PEG and PVD, were found to catalyze the reaction, and their catalytic data was modeled using the Benesi-Hildebrand equation. Interestingly, the catalytic profiles of mixed SDS-DDAO and SDS-PEG/PVD reflected the detailed surfactant-surfactant and surfactant-polymer interactions reported in the literature. The reaction’s product was identified from UV–VIS spectra assisted by the calculations of reaction stoichiometry and 2,4-dnitrophenylhydrazone test. A mechanism of the reaction that coped with the experimental data was suggested.

Keywords: Micellar catalysis· Polymer catalysis· Mixed-surfactant system· Surfactant-polymer interaction

Research Title: Double Aging of Heat-Treated Aluminum Alloy of (7075) and (6061) to Increase the Hardness Number
Author: Ahmed Ismail Ateyat, Published Year: 2020
Springer Nature Switzerland AG 2020, 222
Faculty: Engineering and Technology

Abstract: The present study is an attempt to study the effect of double-aging process and its relevant parameters (like time, temperature and quenching media) on the mechanical properties of two types of aluminum alloys. AA7075 and AA6061 are selected in this study to examine their responses to the double-aging. Fabricated specimens are heat treated, and tested for hardness using micro-Vickers hardness test. They are then artificially aged at 150 °C for different aging periods. The specimens are then quenched in water and oil. Hardness test are then repeated to determine the optimum time and cooling rate that give the maximum (peak) hardness values. This procedure are repeated on other sets of specimens, but with double aging at 185 °C to find out which alloy has more significant response to double ageing. The outcomes of the study show that the 7075 aluminum alloy demonstrates better results than those obtained for the 6061 aluminum alloys. Increase in hardness from 135.66 HV to 150.61 HV is reported for the 7075 aluminum alloy.

Keywords: Heat treatment AA7075 and AA6061 Hardness Double-aging

Research Title: Safe navigation and target recognition for a mobile robot using neural networks
Author: Mohammed Mahdi Ali, Published Year: 2017
2017 14th International Multi-Conference on Systems, Signals & Devices (SSD), Morocco
Faculty: Engineering and Technology

Abstract: Recently, there is a large demand on using mobile robots in different life applications. Thus, it is of importance to ensure mobile robot safe navigation towards its destination. In this research Robotino® from Festo company is used to confirm safe navigation issue along with red color target recognition using its IR and camera sensors respectively. Real-time and simulation experimental results have been obtained in laboratories of faculty of engineering / Philadelphia university / Jordan. Results were taken to train two multi-layers perceptron neural networks. One of them is used to force Robotino® moving towards its target by controlling its linear velocity, while the other one is used to move Robotino® avoiding any possible static or dynamic obstacle in its route. Matlab workspace is used for system analysis and design

Keywords: Safe navigation, Robotino, Neural Networks

Research Title: Obstacles avoidance for omnidirectional mobile robot using line trajectory adaptation
Author: Mohammed Mahdi Ali, Published Year: 2016
13th International Multi-Conference on Systems, Signals & Devices (SSD), Germany
Faculty: Engineering and Technology

Abstract: This paper presents an algorithm which is designed based on the adaptation of Straight-Line Equation parameters in order to detect and avoid both static and dynamic obstacles. A real-time measurement is collected making use of the already built-in nine infrared sensors along with the added ultrasonic sensor to increase the obstacle recognition range. The related control actions coming from the executing of the control algorithm are used to force the mobile robot movement through its three drive units to reach destination safely. This has been achieved by updating the required distance and orientation angle. The experimental results showed the effectiveness of the proposed algorithm in the sense of avoiding obstacles without collision and reaching the goal with minimum position error

Keywords: Mobile Robot, Robotino®, Obstacle Avoidance, line trajectory adaptation

Research Title: Path tracking control of a mobile robot using fuzzy logic
Author: Mohammed Mahdi Ali, Published Year: 2016
13th International Multi-Conference on Systems, Signals & Devices (SSD), Germany
Faculty: Engineering and Technology

Abstract: Recently, the study and development of the mobile robot is considered as a very important issue for many researchers. This is because the wide range of mobile robot applications in real life. One of the most important mobile robot tasks is the control of its navigation in tracking its predefined path. This also need a good capability in avoiding any static or dynamic obstacles that the mobile robot faces in its route until reaching its destination. The difficulty in finding a good mathematical model for the mobile robot used in this research "Robotino® from Festo company" made the decision to use fuzzy logic to design a controller capable to introduce a safe Robotino® navigation. Fuzzy logic controller needs information about Robotino® features and behavior in order to build its rule base which are inspired from human experience in such application. These rules can be easily programmed to bring out an efficient controller. Sugeno algorithm is implemented which the experiments results validated its efficiency. Fuzzy logic controller with 153-fuzzy rule is used for controlling the Robotino® path tracking issue, while another fuzzy logic controller with 27-fuzzy rule is applied for the Robotino® obstacle avoidance feature. Matlab is used as a tool to implement the two proposed fuzzy controllers. Many real-time experiments have been conducted in the Faculty of Engineering research laboratory at Philadelphia University. Results reflect the good abilities of the proposed controllers.

Keywords: Mobile Robot, Robotino®, Path Tracking, Obstacle Avoidance, Fuzzy Logic Controller.

Research Title: A simulation study of multi-disciplinary position control methods of robot arm D.C motor
Author: Mohammed Mahdi Ali, Published Year: 2016
13th International Multi-Conference on Systems, Signals & Devices (SSD), Germany
Faculty: Engineering and Technology

Abstract: This paper presents a simulation study using different control strategies to control the position of robot arm DC motor. Fixed field DC motor mathematical model is applied using certain parameters settings. A state feedback pole placement, Fuzzy Logic, Multi-Layer Perceptron (MLP) Neural Network, and the conventional PID control theories have been applied successfully. Matlab Simulink work space is used in the simulation. Almost the same controlled output responses are obtained with a different transient responses speed.

Keywords: PID, MLP NN, multi-disciplinary position control

Research Title: Robotino obstacles avoidance capability using infrared sensors
Author: Mohammed Mahdi Ali, Published Year: 2015
2015 IEEE Jordan Conference on Applied Electrical Engineering and Computing Technologies (AEECT), Jordan
Faculty: Engineering and Technology

Abstract: Most of the recent mobile robot researchers focus on obstacle avoidance and path tracking in unknown environment. This paper presents a new algorithm using Straight-Line Equation adaptation mechanism that makes Robotino reaching its destination accurately, also to enable it to detect and to avoid static or dynamic obstacles using nine infrared sensors. A brief Robotino dynamic description is discussed to help in understanding the proposed control algorithm. A detailed algorithm design procedure is evaluated. The simulation results showed the effectiveness of the proposed algorithm in the sense of avoiding obstacles without collision through Robotino predefined path.

Keywords: Robotino, Obstacles avoidance, infrared sensors