Onboard Digital Receiver Architecture and Design of the Phase Radio-Navigation System for Aircraft Blind Landing
Journal Article

This work describes the architecture and design of an onboard digital receiver of the phase radio-navigation system for aircraft blind landing proposed in [1]. The proposed onboard digital receiver is a special case of a multi-channel narrowband digital receiver concept. The purpose of this receiver is to receive eight different RF frequencies (in four pairs) range from 960 MHz to 963.003749941 MHz, carry on them the required analogue and digital signal processing techniques to evaluate their phase shifts and then the difference phase shifts between each pair of them. The phase measurements lead to determination of the location of the aircraft with respect to the touch point on the runway with accuracy in millimetres.

S Sasi, NA Shashoa, SK Yakhlef, (03-2015), IJSRSET: IJSRSET, 1 (3), 18-21

New Radio Navigation System for Aircraft Blind Landing
Journal Article

A new radio navigation system for aircraft blind landing is proposed. This system is based on measuring the phase shifts of signals received from four ground transmitters (antennas), placed on corners of the runway strip. The received signals phase shifts provide distance measurements accuracy in millimetres. The reception of these signals is made on the onboard antenna located on the aircraft. Three ground antennas out of the four will be sufficient for determining the location of the aircraft. As a result of the analysis, the coordinates of the onboard antenna, the coordinates of the centre of mass of the aircraft, and axis coordinate of the aircraft determined with respect to the runway coordinate system.

S Sasi, NA Shashoa, (03-2015), International Journal on Recent and Innovation Trends in Computing and Communication: International Journal on Recent and Innovation Trends in Computing and Communication, 3 (2), 626-628

Problem Solutions of Phase Ambiguity and Initial Phase Shifts of the Phase Radio Navigation System for Aircraft Blind Landing
Journal Article

This work is a continuation of a design of a phase radio navigation system for aircraft blind landing in case of nonequipped runways proposed in [1], where, the proposed system is based on measuring the phase shifts of signals received from four ground transmitters (antennas), placed on corners of the runway strip, which provide distance measurements accuracy in millimeters. However, there are two important points that need serious consideration. First, the phase measurement is going to give the total phase () ϕ ρ−

 

0, while the actual phase shift of interest is ‘ϕ’, 0 ρ is the transmitter initial phase. The second problem is that, the measured phase angle () ϕ ρ− 0 between the transmitted and the received signal can only be measured in the interval from 0 to π 2 radians, this problem is called phase ambiguity. The answer of these problems lies in the use of more than one frequency (signal). Two sinusoidal signals with different frequencies (1f and 2f) but the same initial phase can be used. Taking the difference of the measured phases, the initial phase 0 ρ can vanish. To get around phase ambiguity would be to make sure that the actual phase difference 12 ϕ∆ does not exceed π 2, this technique called equivalent or synthetic wavelength.

S Sasi, NA Shashoa, (03-2015), IJISET: IJISET, 2 (3), 10-20

Carbon-13 substituent chemical shifts in N-1-p-substituted phenyl-5-methyl-4-carboxy uracils
Journal Article

The 13C NMR chemical shifts of seven N-1-p-substituted phenyl-5-methyl-4-carboxy uracils have been measured in deuterated dimethyl sulfoxide (DMSO-d6). The correlation analysis for the substituent-induced chemical shifts (SCS) with inductive (σI), and various resonance (σR) parameters were carried out through SSP (single substituent parameter), DSP (dual substituent parameter), and DSP-NLR (dual substituent parameter non-linear resonance) methods, as well as through multiple regression analysis. The presented calculation relative to the polar and resonance effects accounts satisfactorily for substituent effects at uracil carbon atoms. Negative ρ values were found for several correlations (reverse substituent effect).

Fathi H. Assaleh, Aleksandar D. Marinković, Bratislav Ž. Jovanović, Janos Csanádi, (05-2007), Journal of Molecular Structure: Elsevier, 833 (1), 53-57

Investigation of the reactivity of 4-pyrimidinecarboxylic, 6-hydroxy-4-pyrimidinecarboxylic and 5-hydroxyorotic acids with diazodiphenylmethane in various alcohols
Journal Article

Rate constants for the reaction of diazodiphenylmethane (DDM) with 4-pyrimidinecarboxylic, 6-hydroxy-4-pyrimidinecarboxylic and 5-hydroxyorotic acids were determined in twelve protic solvents at 30 °C using the well known UV-spectrophotometric method. The second order rate contants for the examined acids were correlated using the appropriate solvent parameters by the equation log k = log k0 + af(e) + bs * + cngH were f(e) is the Kirkwood function of relative permittivity [(e-l)/(2e + 1 )], s * is the Taft polar constant for the alkyl group R in the alcohol ROH, and nyH is themumber of hydrogen atoms in the (-position in the alcohol. The results obtained for the investigated acids were compared with the corresponding results for benzoic, 2- and 3-hydroxybenzoic acids and the influence of the structure of the investigated acids on the reactivity in hydroxylic solvents is discussed. It was also possible to evaluate and distinguish the specific and non-specific solvent effects and their influence on the reaction rate.

Fathi H. Assaleh, Aleksandar D. Marinković, Saša Ž. Drmanić, Bratislav Ž. Jovanović, (08-2007), Journal of Serbian Chemical Society: Serbian Chemical Society, 73 (3), 205-214

Effect of substituents on the 13C chemical shifts of the azomethine carbon atom of N-(substituted phenylmethylene)-3- and -4-aminobenzoic acids
Journal Article

13C chemical shifts of the azomethine carbon atom for N-(substituted phenylmethylene)-3- and -4-aminobenzoic acids having a wide range of substituent effects, were determined in deuterated DMSO solution. Good Hammett correlations of the 13C NMR chemical shifts of azomethine carbons with electrophilic substituent constants  for electron-donor substituents for both series of acids indicate an important resonance interaction of the substituents on the benzylidene ring with the azomethine carbon atom. On the other hand, good correlations of the 13C NMR chemical shifts of azomethine carbon atom of both series of acids with inductive substituent constants for electron-acceptor substituents in benzylidene ring indicates that the chemical shifts are influenced only by inductive effect of the substituents. The demand for electrons by the azomethine carbon atom in both investigated series have been compared, discussing the mode of transmission of substituent effects, both inductive and resonance, in relation to the geometry of investigated imines.

B. Ž. Jovanović, A. D. Marinković, F. H. Assaleh, (06-2006), Journal of Molecular Structure: Elsevier, 744 (747), 411-316

Kinetics of the reaction of 5-substituted orotic acids with diazodiphenylmethan
Journal Article

Rate konstants for the reaction of eight 5-substituted orotic acids with diazodiphenylmethane (DDM) in dimethylformamide (DMF) were determined at 30 ºC by the known spectrophotometricmethod. The determined rate constants were correlated with the equations: logk2 = ασ1+βσR+h logk2 = ασ1+βσR+ψν+h to detect the presence and investigate the influence of both electrical and steric substituent effects. The obtained results show that the electrical effect (the localized – field and delocalized – resonance) is predominant and that the steric effect, althought present, is releatively small in this reaction.

Batislav Ž. Jovanović, Fathi H. Assaleh, Aleksandar D. Marinković, (08-2004), Journal of Serbian Chemical Society: Serbian Chemical Society, 69 (11), 949-953

دور الأنشطة المدرسية في تنمية المبادئ التربوية لدى طلاب التعليم المتوسط
مقال في مجلة علمية

تؤدي الأنشطة المدرسية إلى تحقيق العديد من الوظائف الأخلاقية والتربوية ، حيث أنها جزءاً مكملاً للمناهج الدراسية ، ويعول عليها كثيراً في تنميتها لجوانب شخصيات الطلاب بطريقة أكثر واقعية وتلقائية حيث ينخرطون للعمل فيها بعيداً عن الروتين والشكلية ويمارس من خلالها الطلبة العديد من القيم مثل : التعاون وحب الآخرين والأمانة وحب العمل وبذلك تحقق المدرسة الاستقرار النفسي والاجتماعي للطلاب 

هاجر أحمد ميلاد الشريف، (12-2019)، مجلة الأكاديمية للعلوم الانسانية والاجتماعية: الأكاديمية الليبية، 17 (1)، 60-76

دور الأستاذ الجامعي في تعزيز القيم الاخلاقية لدى الطلبة " دراسة تحليلية "
مقال في مجلة علمية

تلعب الجامعة دوراً مهماً في عملية تعزيز القيم لدى الطلاب ، ودورها لايقل أهمية عن دور الأسرة حيث تمتاز عن غيرها في عملية التنمية الأخلاقية ، وهي تتحمل دوراً مهماً في تأهيل هولاء الشباب لتلك القيادة في مسيرة التقدم والحضارة سواء كان هذا الدور يتمثل في الجوانب الأكاديمية والعملية ، أم كان يتعلق بالقيم والأخلاق التي تدفعهم للعمل ضمن إطر وأدلة تعينهم في مسيرتهم نحو التطوير ، كما ينبغي أن تقوم جامعاتنا بدورها ويجب أن يعي الأساتذة فيها القيم التي يؤكد عليها المجتمع وتحتاجها التنمية في ظل ثوابت التربية الاسلامية.

هاجر أحمد ميلاد الشريف، (03-2020)، المجلة العلمية المحكمة لكليات التربية: جامعة الزاوية، 17 (2)، 174-188

تصور مقترح لدور الخدمة الاجتماعية في تأصيل الهوية الثقافية لطلاب المرحلة الثانوية "دراسة تحليلية"
مقال في مؤتمر علمي

الملخص : أدت التغيرات الثقافية إلى اختلال في كثير من القيم والمفاهيم الاجتماعية فبعد أن كان الشباب يكتسب قيمه من الأسرة والمدرسة أصبح يكتسبها من قنوات متعددة خاصة مع التطور التكنولوجي وتعدد وسائل الاتصال ، لذلك تعتبر المؤسسات التعليمية ركيزة أساسية في دعم الشخصية والمحافظة على الهوية الثقافية وتأهيلها في نفوس الطلاب .  

هاجر أحمد ميلاد الشريف، (07-2018)، مجلة كلية الآداب جامعة الزاوية: جامعة الزاوية، 121-154