检索结果-南通市图书馆

Resilence Control of DC Microgrid Integrated with Multi-Nanogrids Considering Connected-Islanded States

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第2期10卷 786-796页

作者： Hossien Faraji Reza hemmati Pierluigi Siano Department of Electrical Engineering Amirkabir University of TechnologyTehranIran Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Department of Management&Innovation Systems University of Salernoand also with the Department of Electrical and Electronic Engineering ScienceUniversity of JohannesburgJohannesburg 2006South Africa

In this paper, a DC microgrid (DCMG) integrated with a set of nano-grids (NG) is studied. DCMG exchanges predetermined active and reactive power with the upstream network. DCMG and NGs are coordinately controlled and managed in such a way the exchanged P-Q power with external grid are kept on scheduled level following all events and operating conditions. The proposed control system, in addition to the ability of mutual support between DCMG and NGs, makes NGs support each other in critical situations. On the other hand, in all operating conditions, DCMG not only feeds three-phase loads with time-varying active and reactive power on the grid side but also injects constant active power into the grid. During events, NGs support each other, NGs support DCMG, and DCMG supports NGs. Such control strategies are realized by the proposed control method to increase resilience of the system. For these purposes, all resources and loads in DCMG and NGs are equipped with individual controllers. Then, a central control unit analyzes, monitors, and regularizes performance of individual controllers in DCMG and NGs. Nonlinear simulations show the proposed model can effectively control DCMG and NGs under normal and critical conditions.

关键词： Control system DC microgrid nanogrid resilience

Preventing pediatric cardiothoracic trauma:Role of policy and legislation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Cardiology 2018年第7期10卷 49-51页

作者： Konstantinos S Mylonas pouya hemmati Diamantis I Tsilimigras Pavlos Texakalidis Konstantinos P Economopoulos Pediatric Cardiology Working Group Society of Junior DoctorsAthens 15123Greece Department of Surgery Mayo ClinicRochesterMN 55902United States School of Medicine National and Kapodistrian University of AthensAthens 11527Greece Pavlos Texakalidis Konstantinos P EconomopoulosSurgery Working GroupSociety of Junior DoctorsAthens 15123Greece School of Medicine Faculty of Health SciencesAristotle University of ThessalonikiThessaloniki 54621Greece Department of Surgery Duke University Medical CenterDurhamNC 27710United States

Data from the last 50 years suggest that pediatric pa-tients typically suffer cardiothoracic injuries following blunt traumatic force(70%) in the setting of either motor vehicle crashes(53.5%) or vehicle-pedestrian accidents(18.2%). Penetrating trauma accounts for 30% of pediatric cardiothoracic injuries, half of which are gunshot wounds. Graduated driver licensing progr-ams, gun-control legislation, off-road vehicle regulation, initiatives such as "Prevent the Bleed", as well as prof-essional society recommendations are key in preventing pediatric cardiothoracic injuries.

关键词： Pediatric trauma Blunt cardiac trauma Penetrating cardiac trauma Injury Children Policy Legislation

Surveying organic matter， thermal maturity level， and paleo-environmental conditions by considering biomarker and stable carbon isotopic analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Meysam hemmati Yaser Ahmadi Behzad Vaferi Ali Hosin Alibak David A.Wood DWA Energy Limited School of Geology College of Science University of Tehran Petroleum Engineering Department Faculty of Engineering Soran University Department of Chemical Engineering Shiraz Branch Islamic Azad University Chemical and Petroleum Engineering Department Ilam University

Biomarker and stable carbon isotope analyses are presented for the Garau formation of the Cretaceous age， an important source rock in western Iran， to reveal its potential as an oil-prone source rock. The C28/C29sterane ratio value range (0.72 to 0.83) of bitumen samples from the formation suggests that they were likely formed during phytoplankton blooms. Sterane， hopane， and isoprenoid/n-alkane ratios indicate that the formation’s organic matter predominantly consists of algae， and bacteria， accompanied by some reworked material derived from higher plants. Due to the predominance of anoxic conditions and the actions of sulfate-reducing bacteria， the bitumen present is enriched with sulfur compounds. The percentages of saturates， aromatics， and nitrogen-sulfur-oxygen (NSO) fractions in the bitumen samples classify them as naphthenic oils. Isotope analysis reveals that biodegradation and water-washing have reduced the concentrations of some volatile saturates and low molecular weight aromatics in the bitumen samples. These actions have resulted in distinctive δ13C values for the formation’s kerogen and bitumen fractions. The formation’s organic matter has been subjected to high-temperature thermal regimes and has entered the oil-generation window at the sampled localities， with vitrinite reflectance (%RC) varying between 0.7% and 0.75%.

关键词：

Assessing renewable-energy potential and feasibility in Tehran’s buildings

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Clean Energy 2022年第6期6卷 944-958页

作者： Mehrab hemmati Farahani Marjan Namazzadeh Azin hemmati Farahani Faculty of Engineering Islamic Azad UniversityArak BranchIran Faculty of Geography and Urban planning University of Yadgar Emam Shahr Rey Islamic Azad University TehranIran Faculty of Engineering University of Eyvanekey Iran

This article examines the results of using renewable energy to reduce the energy consumption of buildings *** particular,it looks at the results in a country such as Iran,which has a high potential for using solar energy.A comparison of the energy consumption of selected case samples based on the type of ownership of private,government and municipal buildings in 22 districts of Tehran has been *** data for energy consumption and Strengths,Weaknesses,Opportunities,Threats analysis includes open and usable spaces for installing renewable-energy systems in 10%of public buildings,4%of private facilities and 10%of municipal *** results of this study show that the average energy consumption of buildings in Tehran is almost four times the global *** has~300 days of sunlight for installing solar panels in any place where solar energy is in direct contact with the ***,it allows the building to use the energy absorbed by the discussions in all *** 2050,this country could play a decisive role in producing renewable *** addition,solar energy may reduce fossil-fuel consumption and production costs.

关键词： renewable energy 22 districts of Tehran environmental SWOT analysis building energy consumption

6G-Enabled Internet of Things:Vision,Techniques,and Open Issues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第12期133卷 509-556页

作者： Mehdi Hosseinzadeh Atefeh hemmati Amir Masoud Rahmani Pattern Recognition and Machine Learning Lab Gachon UniversitySeongnam13120Korea Department of Computer Engineering Science and Research BranchIslamic Azad UniversityTehran***Iran Future Technology Research Center National Yunlin University of Science and TechnologyYunlin64002Taiwan

There are changes in the development of wireless technology systems every decade.6G(sixth generation)wireless networks improve on previous generations by increasing dependability,accelerating networks,increasing available bandwidth,decreasing latency,and increasing data transmission speed to standardize communication *** purpose of this article is to comprehend the current directions in 6G studies and their relationship to the Internet of Things(IoT).Also,this paper discusses the impacts of 6G on IoT,critical requirements and trends for 6G-enabled IoT,new service classes of 6G and IoT technologies,and current 6G-enabled IoT studies selected by the systematic literature review(SLR)method published from 2018 to *** addition,we present a technical taxonomy for the classification of 6G-enabled IoT,which includes self-organization systems,energy efficiency,channel assessment,and ***,according to the articles reviewed,we consider the evaluation factors in this domain,including data transmission,delay,energy consumption,and ***,we focus on open issues and future research challenges in 6G-enabled *** mention important future challenges and directions,we can point to migration,data storage,data resource,data security,data sharing,data offloading,availability,scalability,portability,user experience,reliability,authentication,and authorization.

关键词： Internet of Things 6G wireless network machine learning artificial intelligence

Stochastic Linear Programming for Optimal Planning of Battery Storage Systems Under Unbalanced-uncertain Conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 971-980页

作者： Reza hemmati Hasan Mehrjerdi Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Qatar University DohaQatar

Battery energy storage system(BESS)has already been studied to deal with uncertain parameters of the electrical systems such as loads and renewable ***,the BESS have not been properly studied under unbalanced operation of power *** paper aims to study the modelling and operation of BESS under unbalanced-uncertain conditions in the power *** proposed model manages the BESS to optimize energy cost,deal with load uncertainties,and settle the unbalanced loading at the same *** three-phase unbalanced-uncertain loads are modelled and the BESSs are utilized to produce separate charging/discharging pattern on each phase to remove the unbalanced *** IEEE 69-bus grid is considered as case *** load uncertainty is developed by Gaussian probability function and the stochastic programming is adopted to tackle the *** model is formulated as mixed-integer linear programming and solved by GAMS/*** results demonstrate that the model is able to deal with the unbalanced-uncertain conditions at the same *** model also minimizes the operation cost and satisfies all security constraints of power grid.

关键词： Battery energy storage system(BESS) singlephase storage planning unbalanced loading uncertainty

Mass transfer investigation and operational sensitivity analysis of aminebased industrial CO_2 capture plant

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第3期27卷 534-543页

作者： Abbas hemmati Hamed Rashidi Chemical Engineering Department Faculty of Energy Kermanshah University of Technology

In this article, the industrial process of CO_2 capture using monoethanolamine as an aqueous solvent was probed carefully from the mass transfer viewpoint. The simulation of this process was done using Rate-Base model, based on two-film theory. The results were validated against real plant data. Compared to the operational unit, the error of calculating absorption percentage and CO_2 loading was estimated around 2%. The liquid temperature profiles calculated by the model agree well with the real temperature along the absorption tower, emphasizing the accuracy of this model. Operational sensitivity analysis of absorption tower was also done with the aim of determining sensitive parameters for the optimized design of absorption tower and optimized operational conditions. Hence,the sensitivity analysis was done for the flow rate of gas, the flow rate of solvent, flue gas temperature, inlet solvent temperature, CO_2 concentration in the flue gas, loading of inlet solvent, and MEA concentration in the solvent. CO_2 absorption percentage, the profile of loading, liquid temperature profile and finally profile of CO_2 mole fraction in gas phase along the absorption tower were studied. To elaborate mass transfer phenomena, enhancement factor, interfacial area, molar flux and liquid hold up were probed. The results show that regarding the CO_2 absorption, the most important parameter was the gas flow rate. Comparing liquid temperature profiles showed that the most important parameter affecting the temperature of the rich solvent was MEA concentration.

关键词： Carbon dioxide Monoethanolamine Rate-base model Enhancement factor Sensitivity analysis

Bearing Capacity Assessment of Collapsible Soils Improved by Deep Soil Mixing Using Finite Element Method

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Geology 2016年第9期6卷 1055-1068页

作者： pouya Kavandi Alireza Firoozfar Mohammad Amin hemmati Young Researchers and Elite Club Zanjan Branch Islamic Azad University Zanjan Iran University of Zanjan Zanjan Iran Department of Civil Engineering Zanjan Branch Islamic Azad University Zanjan Iran

Problematic soils usually cause considerable problems to engineering projects. As an example, soil structure collapse caused by moisture increment or rising underground water level results in huge settlements. This type of problematic soil, named collapsible soil, can cause dramatic problems and should be amended where exists. Today, the use of different techniques for soil reinforcement and soil improvement is widely used to treat soil properties. One of these methods is Deep Soil Mixing (DSM) method. This method becomes more important in the cases of studying and examining collapsible soils. In this research, the settlement of amended collapsible soils, applying deep soil mixing method, is examined. The experiments show that soil amendment using this method, well prevents the settlement of collapsible soils giving rise to bearing capacity.

关键词： Collapsible Soil Settlement Deep Soil Mixing Finite Element Method

A novel hybrid cybersecurity scheme against false data injection attacks in automated power systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2023年第3期8卷 1-15页

作者： Shahbaz Hussain S.M.Suhail Hussain Marziyeh hemmati Atif Iqbal Rashid Alammari Stefano Zanero Enrico Ragaini Giambattista Gruosso Department of Electrical Engineering Qatar UniversityDohaQatar Dipartimento di Elettronica Informazione e BioingegneriaPolitecnico di MilanoMilanItaly Department of Electrical Engineering King Fahd University of Petroleum and Minerals(KFUPM)DhahranSaudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and Minerals(KFUPM)DhahranSaudi Arabia

The conventional power systems are evolving as smart *** recent times cyberattacks on smart grids have been *** different attacks,False Data Injection(FDI)is considered as an emerging threat that has significant *** exploiting the vulnerabilities of IEC 61850 Generic Object-Oriented Substation Events(GOOSE)and Sam-pled Values(SV)attackers can launch different FDI *** this paper,a real-time set up capable of simulating FDI on GOOSE and SV protocols is developed to evaluate the impact of such attacks on power *** 62351 stipulates cybersecurity guidelines for GOOSE and SV,but only at communication or Information Technology(IT)*** there is a need to develop a holistic security both at IT and Operation Technology(OT)*** this regard,a novel sequence content resolver-based hybrid security scheme suitable to tackle FDI attacks on GOOSE and SV is ***,the computational performance of the proposed hybrid security scheme is presented to demonstrate its applicability to the time critical GOOSE and SV protocols.

关键词： Cyberattacks False data injection Real time digital simulation IEC 61850 Communication protocols Control authority Countermeasures