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Search Results: 1 - 10 of 481812 matches for " Z. A. Mejalli "
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Case Report-Huge Lipoma in the Right Groin  [PDF]
Abdulla Mohammed Megally, M. A. Al-Katta, Z. A. Mejalli, Hadi Mohammed Mujlli
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105714
Lipoma is the most common soft tissue tumor, considered the universal tumor in the body. The differential diagnosis of a lipoma in the groin will include groin hernias, safina varex, lymphadenopathy, hydrocele and sarcoma. Due to the similarity of clinical symptoms and signs, the differentiation between inguinal, femoral hernias and groin lipoma is difficult. To avoid the high risk of intraoperative complications, correct diagnosis is an indication. We are report-ing a case with huge lipoma arisen from the right groin mainly from right la-bium major of a 19-year-old single girl grown in a relatively short period to reach dimensions of a football and weighing 7200 grams. Painless, peduncu-lated tumor arose from labium major to the level of the knee, asymptomatic except unsightly huge mass, which treated successfully by surgical excision without complications and proved benign with no malignant changes detected.
Study of the Different Factors That Influence Jet Pump Performance  [PDF]
A. A. Saker, H. Z. Hassan
Open Journal of Fluid Dynamics (OJFD) , 2013, DOI: 10.4236/ojfd.2013.32006

The objective of this work is to study experimentally the characteristics of jet pump. Suction head, driving air pressure and the percentage of the distance between throat section and nozzle are recorded. The effect of each parameter on the pump performance is investigated, in order to have a better understanding about the behavior of such pump under various conditions. A simple geometry jet pump was designed, developed and tested. The experiments show that we should be careful in increasing the suction head, and stability must be considered between the suction head and the driving air mass flow rate. While the effect of increasing Pa will stop at certain maximum of the ratio of the mass flow rate of water to air (M), that is any increase in Pa will meet no change in M. While increasing S/Dth will leads to decrease in the percentage of M because the optimum S/Dth = 0.5 so that at this value we will have the best performance and any other values for S/Dth the percentage M will decreases, but this effect is not so clear and it could be neglected. The pump performance is not so sensitive with the change of S/Dth after S/Dth = 0.5. Also this information will help improving and extending the use of the jet pump in many practical applications.

Sliding Mode Control with Auto-Tuning Law for Maglev System  [PDF]
L.L. Zhang, Z.Z. Zhang, Z.Q. Long, A.M. Hao
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.22015
Abstract: This paper presents a control strategy for maglev system based on the sliding mode controller with auto-tuning law. The designed adaptive controller will replace the conventional sliding mode control (SMC) to eliminate the chattering resulting from the SMC. The stability of maglev system is ensured based on the Lyapunov theory. Simulation results verify the effectiveness of the proposed method. In addition, the advantages of the proposed controller are indicated in comparison with a traditional sliding mode controller.
Core-Polarization and Relativistic Effects in Electron Affinity Calculations for Atoms: A Complex Angular Momentum Investigation
Z. Felfli,A. Z. Msezane
Physics , 2015,
Abstract: Core-polarization interactions are investigated in low-energy electron elastic scattering from the atoms In,Sn,Eu,Au and At through the calculation of their electron affinities. The complex angular momentum method wherein is embedded the vital electron-electron correlations is used. The core-polarization effects are studied through the well investigated rational function approximation of the Thomas-Fermi potential,which can be analytically continued into the complex plane. The EAs are extracted from the large resonance peaks in the calculated low-energy electron atom scattering total cross sections and compared with those from measurements and sophisticated theoretical methods. It is concluded that when the electron-electron correlation effects and core polarization interactions are accounted for adequately the importance of relativity on the calculation of the electron affinities of atoms can be assessed. For At, relativistic effects are estimated to contribute a maximum of about 3.6 percent to its (non-relativistic) calculated electron affinity.
Reconnection of Vortex Bundles Lines with Sinusoidally  [PDF]
Sultan Z. Alamri, Abeer A. Alenezi
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.46130
Abstract: Using the vortex filament model with the full Biot-Savart law, we show that non-straight bundles of quantized vortex lines in HeII are structurally robust and can reconnect with each other maintaining their identity. We discuss vortex stretching in superfluid turbulence in many cases. We show that, during the bundle reconnection process, Kelvin waves of large amplitude are generated, in agreement with previous work and with the finding that helicity is produced by nearly singular vortex interactions in classical Euler flows. The reconnection events lead to changes in velocities, radius, number of points and total length. The existence of reconnections was confirmed by other authors using the model of nonlinear Schr?dinger equation (NLSE). Our results are agreed with the finding of other authors and extension to our numerical experiments.
Robust Speech Recognition System Using Conventional and Hybrid Features of MFCC, LPCC, PLP, RASTA-PLP and Hidden Markov Model Classifier in Noisy Conditions  [PDF]
Veton Z. K?puska, Hussien A. Elharati
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.36001
Abstract: In recent years, the accuracy of speech recognition (SR) has been one of the most active areas of research. Despite that SR systems are working reasonably well in quiet conditions, they still suffer severe performance degradation in noisy conditions or distorted channels. It is necessary to search for more robust feature extraction methods to gain better performance in adverse conditions. This paper investigates the performance of conventional and new hybrid speech feature extraction algorithms of Mel Frequency Cepstrum Coefficient (MFCC), Linear Prediction Coding Coefficient (LPCC), perceptual linear production (PLP), and RASTA-PLP in noisy conditions through using multivariate Hidden Markov Model (HMM) classifier. The behavior of the proposal system is evaluated using TIDIGIT human voice dataset corpora, recorded from 208 different adult speakers in both training and testing process. The theoretical basis for speech processing and classifier procedures were presented, and the recognition results were obtained based on word recognition rate.
VREG: A Virtual Reality Educational Game with Arabic Content Using Android Smart Phone  [PDF]
Saadeh Z. Sweidan, Khalid A. Darabkh
Journal of Software Engineering and Applications (JSEA) , 2018, DOI: 10.4236/jsea.2018.1110030
Abstract: In the last few decades, technology found its way from being a wild sci-fi dream, only seen in movies, to being an important element of all aspects of life. The technological industry bloomed quite rapidly where the technological solutions have made any process you can think of easier, faster and more efficient. Educational methodologies started off simple, having a teacher using simply his/her words and some writing along with it. With technology entering the field of education, teaching methods were enhanced and the quality of its outcomes was improved. However, sadly in Arab countries that was not the story. In other words, the use of new education technologies is still limited to basic and simple tasks. In fact, to add to the agony, most of the programs used are poorly implemented and rarely applied. Interestingly, as many studies confirm and from the simple observation of kids playing, it is found that most children are very attracted to new technologies and their applications. Those interests not only changed what a normal childhood would look like, but also introduced a multi-billion industry of electronic games. Virtual Reality (VR) games were introduced a few years back starting a gaming revolution, allowing gamers to enter the world of their dreams. Similar to most technologies, VR started to become more affordable with time. Multiple companies have competed to give us amazing VR products such as Samsung Gear. In this manuscript, we present a Virtual Reality Educational Game (VREG), which is an interactive 3D game with Arabic content that targets the students between age 4 and 8 and can be played on a smart phone. VREG includes multiple games that cover the different concepts of Arabic and English languages alongside math, aiming to help the student to learn through playing. In order to make sure that our game reaches wanted education standards, we put it to the test in two private schools; the feedback was very positive from both teachers and students where the majority of users enjoyed their experiments in VR games.
Evaluation of the Crustal Features of the Gulf of Aqaba Deduced from Geophysical Data  [PDF]
A. Z. Hamouda, S. El-Gharabawy
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.74003
Abstract: The Gulf of Aqaba is considered as an interesting rift system. Therefore, it is important to understand the crustal features and thickness variation along the Gulf; to be able to evaluate the effect of tectonic activities in shaping the Gulf. The obtained data were used to estimate the reliable empirical relations between the Bouguer anomalies (ΔgB) and crustal thickness (Hc) in the Gulf of Aqaba. This equation was used to calculate the depth reliefs to the Moho boundary. The output map of the Moho relief and the corresponding crustal thickness were constructed for the Gulf of Aqaba. The depth from sea level down to the Moho discontinuity in the Gulf of Aqaba varies between about 37 km in the northern deep and abruptly changes to about 28 km at the southern area, Tiran Strait. Below the central part of the gulf, a Moho depth of about 34 km is obtained. The Red Sea crust is thinner than that of the Dead Sea rift; indicating the presence of a mantel upwelling that is related to the spreading of the sea floor. The asymmetry of crustal thickness between the eastern and western borders of the Gulf of Aqaba could be attributed to simultaneous strike-slip motion. The relative displacement between the two borders is observed clearly through the sea floor and Moho discontinuity. The displacement is nearly equivalent to 0.18° (i.e. about 20.4 km) and is assumed to be achieved in about 4.08 to 3.4 million years, according to the estimated rate of the transform motion along the Gulf of Aqaba (Dead Sea transform) that is about 0.5 to 0.6 cm/y.
Treatment of Pulp and Paper Mill Wastewater with Various Molecular Weight of PolyDADMAC Induced Flocculation with Polyacrylamide in the Hybrid System  [PDF]
M. A. A. Razali, Z. Ahmad, A. Ariffin
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.24060
Abstract: Flocculation studies between dual polymers on pulp and paper mill wastewater are reported in this paper. The effects of different molecular weights of polyDADMAC and different dosages of Polyacrylamide (PAM) were studied. The molecular weights of polyDADMAC used were 8.8×104, 10.5×104 and 15.7×104 g/mol. The flocculation performance was analyzed in jar tests with PolyDADMAC and Polyacrylamide dosages ranging from 0.4-2.0 mg/L﹣1 and 0.4-8.0 mg/L﹣1 respectively. A higher molecular weight and a 6.0 mg/L﹣1 dosagepolyDADMAC gave the highest level of flocculation based on turbidity and TSS removal. In addition, increasing the molecular weight of PolyDADMAC increased ζ potential values approaching zero. This indicated that polyDADMAC acts as a destabilizer. Based on TSS, the addition of PAM will improve the size of microflocs created by polyDADMAC. It demonstrates that PAM acts as a bridger between microflocs.
Impact of Methyl Jasmonate on Antioxidant Activity and Some Biochemical Aspects of Maize Plant Grown under Water Stress Condition  [PDF]
Z. A. Abdelgawad, A. A. Khalafaallah, M. M. Abdallah
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.512117
Abstract: A pot-culture study was undertaken to investigate the possible role of Methyl jasmonate (MeJA)-treatment on the earlier vegetative growth stage and different chemical constituents of maize cultivar (Giza-2) plants subjected to water stress. The grains were divided into two groups: first group was pre-soaked in water, and the second one was pre-soaked in 50 μM MeJA for 8 h. The plants were subjected to different levels of water field capacity (WFC) 65%, 55% and 45%. The results showed that pre-soaking maize grains with MeJA led to increases in plant growth criteria evident in terms of plant height, fresh and dry weight of plant. The pigment levels concomitantly with total carbohydrates, total soluble sugar, polysaccharides, as well as free amino acids, proline and total protein content were markedly increased. Moreover, the application of the investigated MeJA significantly improved growth hormone in terms of IAA. In contrast ABA level was markedly declined in maize plant. The activities of oxidative CAT, POX and SOD were also increased with MeJA. In addition, the N, P and K content was increased significantly in shoot. As a conclusion, soaking maize grains with MeJA could alleviate the harmful effects of water stress.
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