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Thyristor-Based Resonant Current Controlled Switched Reluctance Generator for Distributed Generation
Emadi Ali,Patel Yogesh P.,Fahimi Babak The Korean Institute of Electrical Engineers 2007 Journal of Electrical Engineering & Technology Vol.2 No.1
This paper covers switched reluctance generator (SRG) and its comparison with induction and synchronous machines for distributed generation. The SRG is simple in design, robust in construction, and fault tolerant in operation; it can also withstand very high temperatures. However, the performance and cost of the SRG power electronics driver are highly affected by the topology and design of the converter. IGBT and MOSFET based converters are not suitable for very high power applications. This paper presents thyristor-based resonant converters which are superior candidates for very high power applications. Operations of the converters are analyzed and their characteristics and dynamics are determined in terms of the system parameters. The resonant converters are capable of handling high currents and voltages; these converters are highly efficient and reliable as well. Therefore, they are suitable for high power applications in the range of 1MW or larger for distributed generation.
Status Review of Power Electronic Converters for Fuel Cell Applications
Emadi, Ali,Williamson, Sheldon S. The Korean Institute of Power Electronics 2001 JOURNAL OF POWER ELECTRONICS Vol.1 No.2
Power electronics plays an important role in providing an interface between fuel cells and loads. Furthermore, power electronic converters ensure that the power is reliably and efficiently delivered to the load in the required DC or AC form. In this paper, major types of fuel cells are presented. Basic structures, operating principles, and different applications of fuel cells are described. In addition, current status and future trends in the areas of power electronics for fuel cells are described. In addition, current statue and future trends in the areas of power electronics for fuel cell applications are explained. A review of fuel cell power electronic system topologies and basic requirements are given as well.
Synthesis and characterization of ultrafine and mesoporous structure of cobalt ferrite
Hamid Emadi,Ali Nemati Kharat 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Ultrafine nanoparticles of cobalt ferrite (CoFe2O4) were synthesized under microwave irradiation inpolyol media and then were applied for the synthesis of mesoporous structures of cobalt ferrite. Theeffect of reaction parameters on products were investigated by X-ray diffraction (XRD), scanningelectron microscopy (SEM), transmittance electron microscopy (TEM), energy dispersive X-rayspectroscopy (EDS), Fourier transform infrared (FT-IR) spectra, vibrating sample magnetometer(VSM), and volumetric nitrogen adsorption. TEM and BET analysis showed presence of mesoporusstructures with pore sizes less than 10 nm in the final product.
Will You Buy It Now?: Predicting Passengers that Purchase Premium Promotions Using the PAX Model
Al Emadi, Noora,Thirumuruganathan, Saravanan,Robillos, Dianne Ramirez,Jansen, Bernard Jim Smart Tourism Research Center 2021 Journal of smart tourism Vol.1 No.1
Upselling is often a critical factor in revenue generation for businesses in the tourism and travel industry. Utilizing passenger data from a major international airline company, we develop the PAX (Passenger, Airline, eXternal) model to predict passengers that are most likely to accept an upgrade offer from economy to premium. Formulating the problem as an extremely unbalanced, cost-sensitive, supervised binary classification, we predict if a customer will take an upgrade offer. We use a feature vector created from the historical data of 3 million passenger records from 2017 to 2019, in which passengers received approximately 635,000 upgrade offers worth more than $422,000,000 U.S. dollars. The model has an F1-score of 0.75, outperforming the airline's current rule-based approach. Findings have several practical applications, including identifying promising customers for upselling and minimizing the number of indiscriminate emails sent to customers. Accurately identifying the few customers who will react positively to upgrade offers is of paramount importance given the airline 'industry's razor-thin margins. Research results have significant real-world impacts because there is the potential to improve targeted upselling to customers in the airline and related industries.
Maryam Emadi,Mohammad Zamani Nejad,Sima Ziaee,Amin Hadi 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.5
In this paper the buckling analysis of the nanoplate made of arbitrary bi-directional functionally graded (BDFG) materials with small scale effects are investigated. To study the small-scale effects on buckling load, the Eringen’s nonlocal theory is applied. Employing the principle of minimum potential energy, the governing equations are obtained. Generalize differential quadrature method (GDQM) is used to solve the governing equations for various boundary conditions to obtain the buckling load of BDFG nanoplates. These models can degenerate into the classical models if the material length scale parameter is taken to be zero. Comparison between the results of GDQ method and other papers for buckling analysis of a simply supported rectangular nano FGM plate reveals the accuracy of GDQ method. At the end some numerical results are presented to study the effects of material length scale parameter, plate thickness, aspect ratio, Poisson’s ratio boundary condition and side to thickness ratio on size dependent Frequency.
Status Review of Power Electronic Converters for Fuel Cell Applications
Ali Emadi,Sheldon S. Williamson 전력전자학회 2001 JOURNAL OF POWER ELECTRONICS Vol.1 No.2
Power electronics plays an important role in providing an interface between fuel cells and loads. Furthermore, power electronic converters ensure that the power is reliably and efficiently delivered to the load in the required DC or AC form. In this paper, major types of fuel cells are presented Basic structures, operating principles, and different applications of fuel cells are described In addition, current status and future trends in the areas of power electronics for fuel cell applications are explained. A review of fuel cell power electronic system topologies and basic requirements are given as well.
A.Emadi 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
In this paper, an approach to the design of negative impedance stabilizing controllers for PWM DC/DC converters that are used in DC switching power supplies with constant power loads is presented. The control approach is based on the feedback linearization technique. Because of the negative impedance destabilizing characteristics of constant power loads, classical linear control methods have stability limitations around the operating points. However, the proposed stabilizing technique improves large-signal stability and dynamic responses. The proposed controllers are simulated and their responses under different operations are studied. Stability of the control technique is also verified using the second theorem of Lyapunov.<br/>