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ADJUSTABLE ACCURACY BEHAVIORAL MODELS FOR SYSTEM-LEVEL ANALOG SIMULATION
Hamad,Hatem,Huss,Sorin A. 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
Methods for generating macromodels for analog functional blocks, as reported in literature, are of limited use in general circuit simulation due to either accuracy or efficiency problems. In this paper we propose a new approach to model the behavior of nonlinear analog functional blocks which produces application specific simulation models of adjustable accuracy. Experimental results are presented for an operational amplifier and art active RC-filter operating in large signal, nonlinear domain. The outlined methodology results in an increase of the simulation speed by at least one order of magnitude and opens an opportunity of system-level simulation of complex analog modules.
Hamad, Imen Haj,Chouchaine, Amine,Bouzaouache, Hajer International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.5
The greenhouse is a complex system. It is subject to multiple input disturbances that are highly dependent on meteorological conditions, which are generally nonlinear and have a great influence on the agricultural production. The objective of this paper is to study the fuzzy logic technique as one of the most efficient technologies to control the greenhouse. The fuzzy logic controller (FLC) was developed to activate the actuator based on a ventilator was installed in an experimental greenhouse to obtain a desired temperature of the microclimate despite the externals disturbances.
Hamad, Luay Badr,Khalaf, Basima Salman,Faleh, Nadhim M. Techno-Press 2019 Advances in materials research Vol.8 No.3
This paper researches static and dynamic bending behaviors of a crystalline nano-size shell having pores and grains in the framework of strain gradient elasticity. Thus, the nanoshell is made of a multi-phase porous material for which all material properties on dependent on the size of grains. Also, in order to take into account small size effects much accurately, the surface energies related to grains and pores have been considered. In order to take into account all aforementioned factors, a micro-mechanical procedure has been applied for describing material properties of the nanoshell. A numerical trend is implemented to solve the governing equations and derive static and dynamic deflections. It will be proved that the static and dynamic deflections of the crystalline nanoshell rely on pore size, grain size, pore percentage, load location and strain gradient coefficient.
Hamad, Sofian,Al Sawy, Yaser Mohammad Mohammad International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.12
The study aimed to realize one of the basic requirements for designing and building the integrated automated system for scientific research at Northern Border University, which includes the establishment of an automated interconnected system to manage all academic and financial operations of scientific research. From receiving the budget of the funded research courses, then the regular financial regulation of all the research team's rewards, the cost of publishing, translation and equipment, then receiving the research plans and linking them financially, preparing the total and detailed financial value for all stages, then financial disbursement operations, financial closure of research when published, and preparing financial reports The research team used the analytical approach to build the main and subsidiary requirements for designing the financial system, and the study concluded that all the elements required for the stages of financial management for scientific research at Northern Border University can be met based on sufficient by sequencing these processes and how they are sequenced as e It is designed in the research study.
Hamad, K.,Chung, B.K.,Ko, Y.G. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.615 No.suppl1
The paper reported the microstructure evolution and mechanical properties of the severely deformed Mg-3%Al-1%Zn alloy sample via isothermal differential speed rolling (DSR) at 453K. The present samples were subjected to DSR operations with the height reduction of 30% at the roll speed ratio of 1:3 for the lower and upper rolls, and these results were compared to those deformed by equal speed rolling (ESR). After two-pass of the DSR, most of the grains were refined markedly to ~3.3μm with a globular shape whose grain size was lower than that via ESR. In addition, Vickers microhardness values of the samples via DSR were higher than those via ESR. The results of tension tests revealed that yield and ultimate tensile strengths of the severely deformed samples via DSR were measured to be ~198 and ~228MPa, respectively. It is worth noting that, with increasing numbers of operations, the tensile ductility of the sample deformed by the DSR was restored whilst the elongation of the sample deformed by the ESR was monotonously deteriorated although both of the cases exhibited lower elongation compared to the as-homogenized. Such phenomenon underlying the restoration of the tensile ductility was discussed by taking the role of the conjugated macro-shear deformation into account.
Tunable electronic and optical properties of GaS/GaSe van der Waals heterostructure
Hamad Rahman Jappor,Majeed Ali Habeeb 한국물리학회 2018 Current Applied Physics Vol.18 No.6
We have used first-principles calculations to investigate the electronic and optical properties of GaS/GaSe van der Waals heterostructures formed by stacking two-dimensional GaSe and GaSe monolayers. Our findings confirm that the GaS/GaSe heterostructures transform from an indirect to a direct band gap material for the two stackings considered in this study. In addition, we found that the direct band gaps are 1.780 eV and 1.736 eV for AA and AB stacking, respectively. It is observed that the behavior of the optical properties of AA stacking is similar to AB stacking with some differences in details and both heterostructures located in UV range. The refractive index values are 2.21 (AA pattern) and 2.18 (AB pattern) at zero photon energy limit and increase to 2.937 for AA and 2.18 AB patterns and both located in the visible region. More importantly, the GaS/GaSe heterostructures have a variety of extraordinary electronic and optical properties. Accordingly, these heterostructures can be useful for the solar cell, nanoelectronics, and optoelectronic applications.