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Control strategy of hybrid fuel cell/battery distributed generation system for grid-connected operation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 488-496页

作者： Masoud Aliakbar GOLKAR Amin hajizadeh Department of Electrical Engineering K.N.Toosi University of TechnologyTehran Iran

This paper presents a control strategy of a hybrid fuel cell/battery distributed generation (HDG) system in distribution systems. The overall structure of the HDG system is given, dynamic models for the solid oxide fuel cell (SOFC) power plant, battery bank and its power electronic interfacing are briefly described, and controller design methodologies for the power conditioning units and fuel cell to control the power flow from the hybrid power plant to the utility grid are presented. To distribute the power between the fuel cell power plant and the battery energy storage, a neuro-fuzzy controller has been developed. Also, for controlling the active and reactive power independently in distribution systems, the current control strategy based on two fuzzy logic controllers has been presented. A Matlab/Simulink simulation model is developed for the HDG system by combining the individual component models and their controllers. Simulation results show the overall system performance including load-following and power management of the HDG system.

关键词： Battery Fuel cell Hybrid distributed generation Intelligent control Power control

Influence of welding speed on microstructure formation in friction-stir-welded 304 austenitic stainless steels

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1517-1524页

作者： Mohsen hajizadeh Sajjad Emami Tohid Saeid Faculty of Mechanical Engineering Sahand University of TechnologyTabrizIran Faculty of Materials Engineering Sahand University of TechnologyTabrizIran

The influence of welding speed on the joint microstructures of an austenitic stainless steel(ASS)produced by friction stir welding(FSW)was *** FSW process was conducted using a rotational speed of 400 r/min and welding speeds of 50 and 150 mm/*** study was carried out using electron backscattered diffraction(EBSD)technique in different regions of the resultant stir zones(SZs).The results show that the texture of the advancing side(AS)was mainly composed of C{001}〈110〉and cube{001}〈100〉texture components along with partial B/B{112}〈110〉*** from the AS toward the center and the retreating side(RS),the cube texture component disappeared and the A;/A*{111}(112)component developed and predominated the other *** welding speed greatly affected and decreased the intensity of the textures in the resultant ***,higher welding speed(lower heat input)resulted in lower frequency of cube texture in the AS.

关键词： friction stir welding stainless steels welding speed dynamic recovery shear texture continuous dynamic recrystallization

Dietary supplementation in patients with alcoholic liver disease: a review on current evidence

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Hepatobiliary & Pancreatic Diseases International 2016年第4期15卷 348-360页

作者： Zeinab Ghorbani Masoomeh hajizadeh Azita Hekmatdoost Department of Clinical Nutrition and Dietetics Faculty of Nutrition and Food TechnologyNational Nutrition and Food TechnologyResearch Institute Shahid Beheshti University of Medical Sciences

BACKGROUND：Alcoholic liver disease（ALD）is one of the main causes of liver disease *** the pathogenesis of ALD has not yet been well elucidated,the oxidative metabolites of ethanol such as acetaldehyde and reactive oxygen species play a pivotal role in the clinical and pathological spectrum of the *** review summarizes the existing evidences on dietary supplements considered to have antioxidant,and/or anti-inflammatory properties,and their role in the management of ALD and the proposed *** SOURCES：The present study reviewed all studies published in Pub Med,Science Direct and Scopus,from 1959 to2015,indicating the role of different dietary supplementation in attenuation of many pathophysiological processes involved in development and progression of ***-texts of citations were used except for those that were published in languages other than ***：Significant progress has been made to understand the key events and molecular players for the onset and progression of ALD from both experimental and clinical studies;however,there is no successful treatment currently *** present review discussed the role of a variety of dietary supplements（*** A,carotenoids,vitamins B3,C and E,in addition to antioxidants and anti-inflammatory agents）in treating *** has been shown that supplementation with some carotenoids,vitamin B3,vitamin C,silymarin,curcumin,probiotics,zinc,S-adenosylmethionine and garlic may havepotential beneficial effects in animal models of ALD;however,the number of clinical studies is very *** addition,supplementation should be accompanied with alcohol ***：Since oxidative stress and inflammation are involved in the pathogenesis of ALD,dietary supplements that can modulate these pathologies could be useful in the treatment of *** addition to alcohol cessation,these supplements have shown beneficial effects on animal models of *** trials are needed to validate t

关键词： alcoholic liver disease fatty liver dietary supplements antioxidants nutrition diet

Bayesian adjustment for over-estimation and under-estimation of gastric cancer incidence across Iranian provinces

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World Journal of Gastrointestinal Oncology 2017年第2期9卷 87-93页

作者： Nastaran hajizadeh Mohamad Amin Pourhoseingholi Ahmad Reza Baghestani Alireza Abadi Mohammad Reza Zali Department of Biostatistics Shahid Beheshti University of Medical Sciences Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Sciences Gastroenterology and Liver Diseases Research Center Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Sciences

AIM To correct the misclassification in registered gastric cancer incidence across Iranian provinces in cancer registry data. METHODS Gastric cancer data is extracted from Iranian annual of national cancer registration report 2008. A Bayesian method with beta prior is implemented to estimate the rate of misclassification in registering patient'spermanent residence in neighboring province. Each time two neighboring provinces with lower and higher than 100% expected coverage of cancer cases are selected to be entered in the model. The expected coverage of cancerous patient is reported by medical university of each province. It is assumed that some cancer cases from a province with a lower than 100% expected coverage are registered in their neighboring province with more than 100% expected coverage. RESULTS The condition was true for 21 provinces from a total of 30 provinces of Iran. It was estimated that 43% of gastric cancer cases of North and South Khorasan provinces in north-east of Iran was registered in Razavi Khorasan as the neighboring facilitate province; also 72% misclassification was estimated between Sistan and balochestan province and Razavi Khorasan. The misclassification rate was estimated to be 36% between West Azerbaijan province and East Azerbaijan province, 21% between Ardebil province and East Azerbaijan, 63% between Hormozgan province and Fars province, 8% between Chaharmahal and bakhtyari province and Isfahan province, 8% between Kogiloye and boyerahmad province and Isfahan, 43% Golestan province and Mazandaran province, 54% between Bushehr province and Khozestan province, 26% between Ilam province and Khuzestan province, 32% between Qazvin province and Tehran province(capital of Iran), 43% between Markazi province and Tehran, and 37% between Qom province and Tehran. CONCLUSION Policy makers should consider the regional misclassification in the time of programming for cancer control, prevention and resource allocation.

关键词： Cancer incidence registry Misclassification Bayesian correction Gastric cancer Iran

Novel approaches for the prediction of density of glycol solutions

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Journal of Natural Gas Chemistry 2008年第3期17卷 298-302页

作者： A.Bahadori Y.hajizadeh H.B.Vuthaluru M.O.Tade S.Mokhatab Department of Chemical Engineering Curtin University of Technology Institute of Petroleum Engineering Heriot-Watt University Process Technology Department Tehran Raymand Consulting Engineers

Two new approaches for the accurate prediction of densities of the commonly used glycol solutions in the gasprocessing industry are presented in the article. The first approach is based on developing a simple-to-use polynomial correlation for an appropriate prediction of density of glycol solutions as a function of temperature and weight percent of glycols in water, where the obtained results show very good agreement with the reported experimental data. The second approach, however, is based on the artificial neural networks （ANN） methodology, wherein the results demonstrate the ability of the introduced method to predict reasonably accurate densities of glycols under operating conditions. Comparisons of the two novel approaches indicated that the simple-to-use correlation appears to be superior owing to its simplicity and clear numerical background, wherein the relevant coefficients can be retuned if new and more accurate data are available in the future. The average deviation of the new proposed polynomial correlation results from reported data is 0.64 kg/m^3 whereas the average deviation of artificial neural networks （ANN） methodology from reported data is 1.1 kg/m^3.

关键词： glycols density polynomial correlation artificial neural networks gas processing

Improving the Sound Absorption Properties of Flexible Polyurethane (PU) Foam using Nanofibers and Nanoparticles

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Sound & Vibration 2019年第5期53卷 207-222页

作者： Roohalah hajizadeh Ali Khavanin Mohammad Barmar Ahmad Jonidi Jafari Somayeh Farhang Dehghan Department of Occupational Health Engineering Faculty of Medical SciencesTarbiat Modares UniversityTehranIran Department of Polyurethane Iran Polymer and Petrochemical InstituteTehranIran Research Center for Environmental Health Technology Department of Environmental Health EngineeringIran University of Medical SciencesTehranIran Department of Occupational Health and Safety at Work Workplace Health Promotion Research CenterSchool of Public Health and SafetyShahid Beheshti University of Medical SciencesTehranIran

Polyurethane foam as the most well-known absorbent materials has a suitable absorption coefficient only within a limited frequency *** aim of this study was to improve the sound absorption coefficient of flexible polyurethane(PU)foam within the range of various frequencies using clay nanoparticles,polyacrylonitrile nanofibers,and polyvinylidene fluoride *** response surface method was used to determine the effect of addition of nanofibers of PAN and PVDF,addition of clay nanoparticles,absorbent thickness,and air gap on the sound absorption coefficient of flexible polyurethane foam(PU)across different frequency *** absorption coefficient of the samples was measured using Impedance Tubes *** clay at low thicknesses as well as polyacrylonitrile nanofibers and polyvinyl fluoride nanofibers at higher thicknesses had a greater positive effect on absorption *** mean sound absorption coefficient in the composite with the highest absorption coefficient at middle and high frequencies was 0.798 and 0.75,*** comparison with pure polyurethane foam with the same thickness and air gap,these values were 2.22 times at the middle frequencies and 1.47 times at high frequencies,*** porosity rose with increasing nano clay,but decreased with increasing polyacrylonitrile nanofibers and polyvinyl fluoride *** results indicated that the absorption coefficient was elevated with increasing the thickness and air *** study suggests that the use of a combination of nanoparticles and nanofibers can enhance the acoustic properties of flexible polyurethane foam.

关键词： Sound absorption coefficient flexible polyurethane foam nano clay polyacrylonitrile nanofibers polyvinyl fluoride nanofibers

Bayesian adjustment of gastric cancer mortality rate in the presence of misclassification

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World Journal of Gastrointestinal Oncology 2017年第4期9卷 160-165页

作者： Nastaran hajizadeh Mohamad Amin Pourhoseingholi Ahmad Reza Baghestani Alireza Abadi Mohammad Reza Zali Department of Biostatistics Shahid Beheshti University of Medical Sciences Basic and Molecular Epide-miology of Gastrointestinal Disorders Research Center Research Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical Sciences Gastroenterology and Liver Diseases Research Center Research Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical Sciences

To correct for misclassification error in registering causes of death in Iran death registry using Bayesian method. METHODSNational death statistic from 2006 to 2010 for gastric cancer which reported annually by the Ministry of Health and Medical Education included in this study. To correct the rate of gastric cancer mortality with reassigning the deaths due to gastric cancer that registered as cancer without detail, a Bayesian method was implemented with Poisson count regression and beta prior for misclassified parameter, assuming 20% misclassification in registering causes of death in Iran. RESULTSRegistered mortality due to gastric cancer from 2006 to 2010 was considered in this study. According to the Bayesian re-estimate, about 3%-7% of deaths due to gastric cancer have registered as cancer without mentioning details. It makes an undercount of gastric cancer mortality in Iranian population. The number and age standardized rate of gastric cancer death is estimated to be 5805 (10.17 per 100000 populations), 5862 (10.51 per 100000 populations), 5731 (10.23 per 100000 populations), 5946 (10.44 per 100000 populations), and 6002 (10.35 per 100000 populations), respectively for years 2006 to 2010. CONCLUSIONThere is an undercount in gastric cancer mortality in Iranian registered data that researchers and authorities should notice that in sequential estimations and policy making.

关键词： Misclassification Bayesian method Cause of death Gastric cancer Iran

Effect of crocin carotenoid on BDNF and CREB gene expression in brain ventral tegmental area of morphine treated rats

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Asian Pacific Journal of Tropical Biomedicine 2018年第8期8卷 387-393页

作者： Marzieh Rezai Mehdi Mahmoodi Ayat Kaeidi Mojgan Noroozi Karimabad Alireza Khoshdel Mohammad Reza.hajizadeh Department of Clinical Biochemistry Faculty of Medicine Rafsanjan University of Medical Sciences Department of Clinical Biochemistry Afzalipoor Faculty of Medicine Kerman University of Medical Sciences Molecular Medicine Research Center Research Institute of Basic Medical Sciences Rafsanjan University of Medical Sciences Physiology-Pharmacology Research Center Research Institute of Basic Medical Sciences Rafsanjan University of Medical Sciences Department of Physiology and Pharmacology School of Medicine Rafsanjan University of Medical Sciences Department of Clinical Biochemistry Faculty of Medicine and Pistachio Safety Research Center Rafsanjan University of Medical Sciences

Objective: To investigate the effect of crocin carotenoid on BNDF and CREB gene expression in the brain ventral tegmental area(VTA) and the serum level of BDNF in morphine-treated rats compared to control. Methods: In this study, 40 male Wistar rats(200-250 g) were used in 5 experimental groups: 1) non morphine treat rats(control); 2) non morphine-treated rats with 25 mg/kg crocin carotenoid(i.p., for 21 d); 3) morphine treated rats(10 mg/kg twice a day, s.c., 21 d); 4 and 5) morphine-treated rats with 12.5 and 25 mg/kg crocin carotenoid, respectively. By the end of research, BDNF and CREB expression was determined by real-time-PCR method. ELISA analysis was also applied for assessing the serum BDNF level. Results: The data indicated that morphine treatment could cause a significant decrease in BDNF and CREB gene expression(P<0.01 and P<0.001, respectively) in brain VTA as well as serum level of BDNF(P<0.01) in comparison to control group. Treatment with 25 mg/kg crocin carotenoid caused a significant enhancement in BDNF and CREF gene expression(P<0.01 and P<0.05, respectively) and serum level of BDNF(P<0.01) in morphine-treated rats in comparison to morphine-treated group. Conclusions: Regarding to obtained results, crocin carotenoid can inhibit unfavorable effects of morphine on the neural system to some extent through enhancing BDNF and CREB gene expression in brain VTA and serum level of BDNF.

关键词： Morphine BDNF CREB Crocin Ventral tegmental area Rat

A machine learning enabled hybrid optimization framework for efficient coarse-graining of a model polymer

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npj Computational Materials 2022年第1期8卷 2128-2138页

作者： Zakiya Shireen Hansani Weeratunge Adrian Menzel Andrew W.Phillips Ronald G.Larson Kate Smith-Miles Elnaz hajizadeh Department of Mechanical Engineering Faculty of Engineering and Information TechnologyThe University of MelbourneMelbourneAustralia Platforms Division Defence Science and Technology GroupMelbourneAustralia Department of Chemical Engineering University of MichiganAnn ArborMIUSA School of Mathematics and Statistics The University of MelbourneMelbourneAustralia

This work presents a framework governing the development of an efficient,accurate,and transferable coarse-grained(CG)model of a polyether *** framework combines bottom-up and top-down approaches of coarse-grained model parameters by integrating machine learning(ML)with optimization *** the bottom-up approach,bonded interactions of the CG model are optimized using deep neural networks(DNN),where atomistic bonded distributions are *** the top-down approach,optimization of nonbonded parameters is accomplished by reproducing the temperature-dependent experimental *** demonstrate that developed framework addresses the thermodynamic consistency and transferability issues associated with the classical coarse-graining *** efficiency and transferability of the CG model is demonstrated through accurate predictions of chain statistics,the limiting behavior of the glass transition temperature,diffusion,and stress relaxation,where none were included in the parametrization *** accuracy of the predicted properties are evaluated in context of molecular theories and available experimental data.

关键词： optimization grain integrating