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Fathy, I.,Amory-Mazaudier, C.,Fathy, A.,Mahrous, A. M.,Yumoto, K.,Ghamry, E. American Geophysical Union 2014 JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS Vol.119 No.5
In this paper we study the planetary magnetic disturbance during the magnetic storm occurring on 5 April 2010 associated with high-speed solar wind stream due to a coronal hole following a coronal mass ejection. We separate the magnetic disturbance associated to the ionospheric disturbance dynamo (Ddyn) from the magnetic disturbance associated to the prompt penetration of magnetospheric electric field (DP2). This event exhibits different responses of ionospheric disturbance dynamo in the different longitude sectors (European-African, Asian, and American). The strongest effect is observed in the European-African sector. The Ddyn disturbance reduces the amplitude of the daytime H component at low latitudes during four consecutive days in agreement with the Blanc and Richmond's model of ionospheric disturbance dynamo. The amplitude of Ddyn decreased with time during the 4days. We discuss its diverse worldwide effects. The observed signature of magnetic disturbance process in specific longitude sector is strongly dependent on which Earth's side faces the magnetic storms (i.e., there is a different response depending on which longitude sector is at noon when the SSC hits). Finally, we determined an average period of 22h for Ddyn using wavelet analysis.
Suggested Integrative Approach for Hand Abscess with Cupping Therapy: a case study
Hussein Emad Ahmed Fathy,Negm Shahira Hassan Ibrahim,Shaikh Tabish Ishaq,Saleh Ahmed Helmy,Hussein Emad Ahmed Fathy 대한약침학회 2023 Journal of pharmacopuncture Vol.26 No.1
A forty-three-year-old male patient was diagnosed with an acute abscess in the dorsum of the right hand. On the 5th day of conventional pharmacological therapy the patient was still suffering, and was referred to the Outpatient department (OPD) to evacuate and drain the abscess and treat the edema around the area with Hijama (wet cupping therapy, WCT). The hand abscess was successfully cured within a week using an integrative approach of wet cupping therapy together with conventional drug therapy.
A Novel Quasi-Resonant Snubber-Assisted ZCS-PWM DC-DC Converter with High Frequency Link
Fathy, Khairy,Kwon, Soon-Kurl The Korean Institute of Power Electronics 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.2
In this paper, a novel type of auxiliary switched capacitor assisted edge resonant soft switching PWM resonant DC-DC converter with two simple auxiliary commutation lossless inductor snubbers is presented. The operation principle of this converter is described using the switching mode equivalent circuits. This newly developed multi resonant DC-DC converter can regulate its DC output AC power under a principle of constant frequency edge-resonant soft switching commutation by an asymmetrical PWM duty cycle control scheme. The high frequency power regulation and actual power characteristics of the proposed soft switching PWM resonant DC-DC converter are evaluated and discussed. The operating performances of the newly proposed soft switching inverter are represented based on simulation results from an applications point of view.
Fathi hafssa,왕준휘,송학준 한국호텔외식관광경영학회 2018 호텔경영학연구 Vol.27 No.2
Community-based tourism allows for better contact with the local community and for tourist to experience new sensations while enabling the economic and social development of the geographic area. In this paper, a survey in Chefchaoun in Morocco was conducted two times to assess the opinion and perception of visitors and local community investors towards tourism. Current study revealed some problems faced by visitors(e.g., unreasonable accommodation prices, hard selling, overcrowding, poor quality services, unsuitable food prices, inadequate public facilities and entertainment places, and unconfident guide) and some problems recognized by the local community investors(e.g., lack of government interest, poor infrastructure, lack of public facilities and entertainment places, tax, and lack of tourism training centers). According to the results of factor analysis, there are two main factors suggested as strategies to reduce the community problems in Chefchaoun, namely Hardware strategy, and Software strategy. In this part six implications were carried out in present study. The results of present research would be useful to introduce proper strategies and suggestions to meet the needs and requirements of both the visitors and local community investors.
Fathy, Khairy,Morimoto, Keiki,Suh, Ki-Young,Kwon, Soon-Kurl,Nakaoka, Mutsuo The Korean Institute of Electrical Engineers 2007 Journal of Electrical Engineering & Technology Vol.2 No.1
This paper presents a new circuit topology of active edge resonant snubbers assisted half-bridge soft switching PWM inverter type DC-DC high power converter for DC bus feeding power plants. The proposed DC-DC power converter is composed of a typical voltage source-fed half-bridge high frequency PWM inverter with a high frequency planar transformer link in addition to input DC busline side power semiconductor switching devices for PWM control scheme and parallel capacitive lossless snubbers. The operating principle of the new DC-DC converter treated here is described by using switching mode equivalent circuits, together with its unique features. All the active power switches in the half-bridge arms and input DC buslines can achieve ZCS turn-on and ZVS turn-off commutation transitions. The total turn-off switching losses of the power switches can be significantly reduced. As a result, a high switching frequency IGBTs can be actually selected in the frequency range of 60 kHz under the principle of soft switching. The performance evaluations of the experimental setup are illustrated practically. The effectiveness of this new converter topology is proved for such low voltage and large current DC-DC power supplies as DC bus feeding from a practical point of view.
Fathi Masoud,S. M. Sapuan,Mohd Khairol Anuar Mohd Ariffin,Y. Nukman,Emin Bayraktar 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
This study aims to evaluate the influence of the input parameters on the resulted cutting quality and dimensionalstability in cutting different thicknesses of sugar palm fiber reinforced unsaturated polyester (SPF-UPE) cut utilizing abrasivewater jet (AWJ) and lease beam (LBM) machining techniques. In this research, broad ranges of input parameter values wereapplied and then evaluated their impact on cutting quality and dimensional stability by means of examination with the nakedeye and microscopic testing to determine the defects resulting in both cutting process, and then determining the ranges ofinput parameters that give the best results which can be used as start points in subsequent studies related to evaluating ofsurface quality, and kerf taper angle, etc. In this study, specific ranges of input parameters were obtained through whichsuccessful cutting process can be achieved that give good cutting quality with stable specimen dimensions. Also, through thisstudy, the ranges of input parameters that result in unsuccessful cutting processes were determined, whether those ranges thatproduce defects represented in the various types of damages at the cutting zone or uncompleted cuts due to the application ofunsuitable parameter values. From the study, it can be concluded that the desired results from both cutting processes can beachieved by applying the appropriate ranges of the input parameters.
Reinforced Connection for Upgrading Strength and Efficiency of Single Angle Tension Members
Fathy Abdelmoniem Abdelfattah,Ali Abdel Hakam Ali abdo 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2
Single angle tension members are commonly connected by bolting through one leg. Stress concentration and shear lag effects promote the angle failure at the connection region. This angle failure reduces the angle ultimate tensile strength and efficiency of the material. This study proposes a reinforced connection to upgrade the single angle tension strength of the member and its material efficiency. A lug angle was nested into the angle member and bolted to the gusset plate and the angle by the lead bolt in the connection. At some distance, the outstanding legs of the angle and lug angle were bolted. A total of 17 specimens were fabricated and tested until failure. Finite element analysis was performed to model the behavior of the tested specimens and to study the different parameters that may affect the connection's capacity. The proposed reinforced connection increased the tensile strength of the angle and the angle material efficiency by up to 35%. An empirical formula was proposed, and design recommendations are presented.
Fathi Etaher Elbakoush,Qudrat Ullah Khan,Mati Ullah,Arif Ullah,Afaq Ullah Khan,Javed Khan,Asra Iftikhar 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
The carbonization performance of the iron-containing carbon film resulting from polyimide was examined, Polyimide/Fe composite films were prepared from Iron (III) 2,4-pentanedionate (Fe(acac)) and poly(amic acid) (PAA) based on ODA and PMDA via a solution process in DMAC, followed by carbonization the polyimide film at a temperature range of 600–1600 °C. The organized polyimide/Fe combined fi lms were characterized using a scanning electron microscope (SEM), and thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Raman. The formation of Fe particles and the synthesis of polyimide (PMDA/ODA) in the polyimide matrix is confirmed by FTIR results. Meantime, in the polyimide matrix, Fe particles were well spread which were showed by the SEM images. Kinetic parameters and thermal stability of the degradation methods for the organized polyimide/Fe combined films were examined in N 2 environment by TGA. The results have shown that the values of the calculated activation energies and thermal stability increased of the (Fe (acac)) the activation energy and loading also different with the weight-loss rate for all compositions.