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ON THE STABILITY OF A FUNCTIONALLY GRADED RECTANGULAR MICRO-PLATE SUBJECTED TO HYDROSTATIC AND NONLINEAR ELECTROSTATIC PRESSURES

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Acta Mechanica Solida Sinica 2013年第2期26卷 205-220页

作者： adel Nabian Ghader Rezazadeh Morteza Almassi ali-Mohammad Borgheei Department of Agricultural Machinery Engineering Science and Research BranchIslamic Azad UniversityTehranIran Department of Mechanical Engineering Urmia UniversityUrmiaIran

This article studies the stability of a functionally graded clamped-clamped micro- plate subjected to hydrostatic and electrostatic pressures. Equilibrium positions of the micro-plate are determined and shown in the state control space. To study the stability of the equilibrium positions, the motion trajectories are given for different initial conditions in the phase plane. Effects of the electrostatic and hydrostatic pressure changes on the deflection and stability of the micro-plate for some sample value of k are studied and values of the applied voltage and hydrostatic pressure leading system to unstable conditions by undergoing a saddle node and homoclinic bifurcations are determined.

关键词： MEMS FGM stability micro-plate electrostatic hydrostatic pressure

Forest structure and woody plant species composition after a wildfire in beech forests in the north of Iran

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Journal of Forestry Research 2013年第2期24卷 255-262页

作者： Mohammad Naghi adel Hassan Pourbabaei ali Omidi Daniel C Dey Facultad de Department of Forestry Natural Resources Faculty University of Guilan Department of Forestry Natural Resources Office USDA Forest Service Northern Research Station 202 Natural Resources Building

Beech （Fagus orientalis Lipsky） forest covers about 565,000 ha of land in Guilan province, north of Iran and forms a major carbon pool. It is an important economic, soil protection and recreation resource. We studied long-term effects of fire on the structure and composition 37 years after fire occurrence in these forests. To do this research, we selected 85 ha burned and 85 ha unburned beech forests）. The results indicated that the fire had not changed the overall uneven-aged structure, but it changed forest composition from pure stands to mixed stands that now include species such as Carpinus betulus, Acer cappadocicum and Alnus subcordata. The density of trees and regeneration was significantly increased, while the density of shrubs significantly decreased. The main reasons for increased tree regeneration were attributed to （1） reduction of litter depth, and （2） increase in available light from opening of the canopy and reduction in shrub competition. It is apparent that the forest is on a path to return to its natural state before the fire after 37 years.

关键词： fire structure composition regeneration beech forest Guilan Province

Robust correlation to predict dew point pressure of gas condensate reservoirs

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Petroleum 2017年第3期3卷 340-347页

作者： Mohammad ali Ahmadi adel Elsharkawy Department of Petroleum Engineering Ahwaz Faculty of Petroleum EngineeringPetroleum University of TechnologyAhwazIran Department of Petroleum Engineering College of Engineering&PetroleumKuwait UniversityKuwait

When the bottom-hole flowing pressure in a gas condensate reservoir drops below the dew point pressure,liquid starts to build up around the well bore resulting in gas productivity *** this reason it is important to be able to accurately either measure or estimate the dew point *** condensate formed in the reservoir will not flow until its saturation reaches the critical saturation and in many cases it might not be entirely *** order to maximize gas production and condensate recovery,the reservoir pressure must be maintained close to the dew point *** attempts have been made to predict the dew point pressure in case the gas sample becomes unavailable or measured value is ***,most of these attempts have minor success rates and are based on limited *** this paper we present a robust,cheap,and easy model for predicting the dew point pressure for gas condensate *** new model is an intelligent based model called“Gene Expression Programming”that is carried out to generate a precise and accurate correlation to estimate the dew point pressure in condensate gas *** new model has been trained and tested using a large data bank collected for the *** of the suggested correlation has been compared to published *** validity of this model has also been compared to experimental data and other published correlations.

关键词： Dew point pressure Gene Expression Programming Condensate gas Modeling

A Solvation Model for Performance Enhancement of Dye-Sensitized Solar Cells

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1569-1579页

作者： adel Daoud ali Cheknane Jean Michel Nunzi Afak Meftah Laboratoire des Matériaux Semi-Conducteurs et Métalliques(LMSM) Universitéde BiskraBiskraAlgeria Laboratoire des Semi-Conducteurs et Matériaux Fonctionnels(LSMF) UniversitéAmar Telidji de LaghouatLaghouatAlgérie Department of Chemistry Queen’s UniversityKingstonCanada Department of Engineering Physics and Astronomy Queen’s UniversityKingstonCanada

A solubility model for Merocyanine-540 dye together with the interface’s electron transfer kinetics of MC-540/TiO2 has been investigated(Merocyanine 540-based dye has been used effectively in dye-sensitized solar cells).The highest absorption peaks were recorded at 489 nm and 493 nm in Water and Ethanol solvent,*** vacuum phase which yielded 495 nm(associated with a modest electron injection-free energy value(Ginj)of−2.34 eV for both Water and Ethanol solvents).The time-dependent density functional theory(TD-DFT)method approach has been applied in this ***,the electronic structure and simulated UV-Vis spectra of the dye in different solvents have been determined,and the alignment with the solar spectrum has been discussed to a certain *** energy level diagrams and electron density of the primary molecular orbitals are shown,and the major issues that have an impact on our new interface’s performance are *** is concluded that the proposed Solvation Model(SM)can improve the performance of Dye-Sensitized Solar Cells.

关键词： Mc-540-based dye DFT method electron injection n-DSSCs

A numerical study of anti-vortex film-cooling holes designs in a 1-1/2 turbine stage using LES

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Propulsion and Power Research 2019年第4期8卷 275-299页

作者： Nabeel Al-Zurfi ali Turan adel Nasser Ahmed Alhusseny Department of Mechanical Engineering Faculty of EngineeringUniversity of KufaNajafIraq Visiting Researcher Department of MechanicalAerospace and Civil EngineeringSchool of EngineeringFaculty of Science and EngineeringThe University of ManchesterManchesterM139PLUK Department of Mechanical Aerospace and Civil EngineeringSchool of EngineeringFaculty of Science and EngineeringThe University of ManchesterManchesterM139PLUK

The primary focus of the present study is to investigate the impact of anti-vortex holes design on the film-cooling performance in a film-cooled rotor blade model using the large eddy simulation method(LES).One row of the film holes was positioned on the pressure surface of the rotor *** row had three cylindrical holes(the main hole in the present study)with a diameter(D)of 4 mm and a tangential injection angle of 28 *** main hole supplemented with the addition of two symmetrical side holes(anti-vortex holes),which branch out from the same main *** positions for the anti-vortex side holes were considered;namely:upstream to the outlet of the main hole;in line with the main hole;and downstream of the main *** Reynolds number was fixed at Re Z 1.92105 and the speed of the rotor blade was taken to be 1800 *** blowing ratio varied from 1.0 to 5.0 and the density ratio of coolant to mainstream was *** to the base hole,the film cooling performance of the all anti-vortex cases showed obvious improvement at all blowing *** middle stream side holes and downstream side holes each demonstrated good film cooling performance at all blowing ratios,while the upstream side holes perform well only at a lower blowing *** presence of side holes can restrain the CRVP(counter rotating vortex pairs)intensity of the main hole and reduce the coolant lift-off,improving the film coverage and film cooling *** downstream side holes can perform better in reducing the CRVP intensity.

关键词： Rotor blade Large eddy simulation Film-cooling effectiveness Turbulence Rotation Anti-vortex hole

Machine Learning Applied to Problem-Solving in Medical Applications

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Computers, Materials & Continua 2021年第11期69卷 2277-2294页

作者： Mahmoud Ragab ali Algarni adel A.Bahaddad Romany F.Mansour Department of Information Technology Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Centre for Artificial Intelligence in Precision Medicine King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Statistics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Mathematics Faculty of ScienceNew Valley UniversityEl-Kharga72511Egypt

Physical health plays an important role in overall well-being of the human *** is the most observed dimension of health among others such as social,intellectual,emotional,spiritual and environmental *** to exponential increase in the development of wireless communication techniques,Internet of Things(IoT)has effectively penetrated different aspects of human *** is one of the dynamic domains with ever-growing demands which can be met by IoT *** can be leveraged through several health service offerings such as remote health and monitoring services,aided living,personalized treatment,and so *** this scenario,Deep Learning(DL)models are employed in proficient disease *** current research work presents a new IoT-based physical health monitoring and management method using optimal Stacked Sparse Denoising Autoencoder(SSDA)technique i.e.,*** proposed model utilizes a set of IoT devices to collect the data from *** class problem poses serious challenges during disease diagnosis ***,the OSSDA model includes Synthetic Minority Over-Sampling Technique(SMOTE)to generate artificial minority class instances to balance the class ***,the hyperparameter settings of the OSSDA model exhibit heavy influence upon the classification performance of SSDA *** number of hidden layers,sparsity,and noise count are determined by Sailfish Optimizer(SFO).In order to validate the effectiveness and performance of the proposed OSSDA technique,a set of experiments was conducted on diabetes and heart disease *** simulation results portrayed a proficient diagnostic outcome from OSSDA technique over other *** proposed method achieved the highest accuracy values i.e.,0.9604 and 0.9548 on the applied heart disease and diabetes datasets respectively.

关键词： IoT patient monitoring physical health deep learning parameter tuning

An Analogue of the Z4-Goethals Code in Non-Primitive Length

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Journal of Systems Science & Complexity 2017年第4期30卷 950-966页

作者： ALAHMADI adel ALHAZMI Husain ali Shakir HELLESETH Tor HIJAZI Rola LI Chunlei SOLE Patrick Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia Department of Mathematics Faculty of ScienceRabigh CampusKing Abdulaziz UniversityRabighSaudi Arabia Department of Informatics University of BergenBergenNorway CNRS/LAGA University Paris 893 526 Saint-DenisFrance

This paper constructs a cyclic Z_4-code with a parity-check matrix similar to that of Goethals code but in length 2~m+ 1, for all m ≥ 4. This code is a subcode of the lifted Zetterberg code for m even. Its minimum Lee weight is shown to be at least 10, in general, and exactly 12 in lengths 33, 65. The authors give an algebraic decoding algorithm which corrects five errors in these lengths for m = 5, 6 and four errors for m > 6.

关键词： Cyclic codes Goethals code Z4-codes.

Comparison and Analysis of Heat Transfer and Inflow Rate for Supercritical Carbon Dioxide Based on Different Tubes

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Frontiers in Heat and Mass Transfer 2023年第1期21卷 443-465页

作者： Huda adel Hassan ali Ameer Abed Jaddoa Jafaar Mohamme Daif Electromechanical Engineering Department University of TechnologyBaghdadIraq

This paper is ***,the effect of non-linear thermophysical property variation was presented using supercritical carbon dioxide(SCO_(2))around the thermodynamic pivotal *** second part exhibits an experimental examination of the heat transfer(HT)behaviour of SCO_(2) in a helical tube with a hydraulic diameter of 2 mm at different mass fluxes(MF),heat fluxes(HF),and pressures(P).The experiments were carried out based on various pressures,mass fluxes,and heat fluxes for both ***_(2) was cooled in a 2 mm diameter serpentine tube made of copper *** experimental results showed that HT degradation could happen under the circumstances of a change in HF and MF and have significant effects on fluid inflow and HT ***,buoyancy plays an essential and influential role in the HT *** increasing the pressure value,the HT parameters decrease when the pressure reaches 8 MPa,and the flotation value is more significant,which means a decrease in the HT ***,under the system circumstances,the HT value decreases with the increase in heat flux and pressure and increases with the increment in MF.

关键词： SC-CO_(2) mini channels MF HT

A model for selecting green suppliers through interval-valued intuitionistic fuzzy multi criteria decision making models

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Journal of Management Analytics 2022年第1期9卷 60-85页

作者： Seyedeh Saeedeh Mohammadi adel Azar ali Rajabzadeh Ghatari Moslem alimohammadlou Faculty of Management and Economics Tarbiat Modares UniversityTehranIran Management Department Shiraz UniversityEram Campus of Shiraz UniversityShirazIran

This study sought to construct a model for selecting green *** study was conducted in three phases:in phase 1,the literature was reviewed based on the meta-synthesis method and experts’opinions were analyzed to create a model composed of 11 dimensions and 40 criteria for selecting green *** phase 2,intuitionistic fuzzy best-worst method was used to weight the dimensions and *** most important dimension was“green image”and the most important criteria were the“environmental protection system”and a good“public image.”In phase 3,four suppliers in the field of medical equipment were assessed and *** study proposed a framework for selecting green supplier selection(GSC)and could prove to be more comprehensive than the existing models as it drew on the meta-synthesis *** innovation of the study was its reliance on the intuitionistic fuzzy set theory to overcome ambiguities in selecting suppliers.

关键词： green supplier best-worst method MULTIMOORA intuitionistic fuzzy