检索结果-南通市图书馆

Effects of Wind Turbines Equipped with Doubly-fed Induction Generators on Distance Protection

在线全文

学校读者我要写书评

暂无评论

电力系统自动化 2012年第8期36卷 128-131页

作者： Hossein Kazemi KAREGAR maryam KHODDAM Faculty of Electrical &Computer Engineering Shahid Beheshti University

Nowadays wind energy is the fastest growing renewable energy resource in the *** problems of integrating wind farms are caused by changes of wind speed during a ***,the behaviors of wind turbines equipped with doubly-fed induction generators differ fundamentally from synchronous ***,more considerations are needed to analyze the performances of the distance protection *** protection of a wind farm with distance relay is *** changing the conditions of the wind farm,the characteristics of the distance relay are studied.

关键词：距离保护双馈异步发电机风力发电机组配备可再生能源资源双馈感应发电机距离继电器同步发电机

Gradient microstructure and enhanced mechanical performance of magnesium alloy by severe impact loading

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第1期36卷 45-49页

作者： maryam Jamalian David P.Field School of Mechanical and Materials Engineering.Washington State University PullmanUSA

Subjecting a workpiece to a surface treatment with severe impact loading is a novel severe plastic deformation procedure to fabricate gradient microstructures through the thickness and longitudinal *** performance is a function of twin density and the newly-formed grain size gradients.{1012}tensile twins created from processing without excessive grain refinement lead to strength enhancement with retained *** of residual strain by a single impact results in a significant reduction in time and cost of the *** paper investigates the effect of applying severe impact loading on mechanical and microstructural properties of magnesium for various impact velocities.

关键词： Surface modification Twinning Magnesium alloys Mechanical properties Severe impact loading(SIL)

Improvement in the protective performance and adhesion of polypyrrole coating on AZ31 Mg alloys

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2015年第5期25卷 478-485页

作者： maryam Hatami Mohsen Saremi Reza Naderi School of Metallurgy and Materials Engineering Faculty of Engineering University of Tehran

The electrochemical synthesis of polypyrrole(Ppy) coating on AZ31 magnesium alloy was successfully achieved in a solution containing sodium salicylate and monomer of pyrrole through cyclic voltammetry *** effect of potential range,passivation pretreatment and number of cycles of polymerization on the quality and protective performance of the coatings was evaluated using surface analysis and electrochemical *** taking the advantage of charge transfer resistance,current density,corrosion potential,optical microscopy images and SEM micrographs,the optimum condition of synthesis of a Ppy coating with the best adhesion and corrosion protection was *** optimal PPy coating synthesized over AZ31 increases the polarization resistance and decreases the corrosion current more than one order of magnitude and shift the corrosion potential about 200 mV toward nobler *** SEM studies showed that Ppy coating have cauliflower morphology of Ppy grains with a diameter ranging from 20 nm to 60 nm.

关键词： PolyPyrrole AZ31 Mg Cyclic voltammetry Electropolymerization Corrosion protection

The role of geometrical features in the architecturalstructural interaction:Some case studies of the Iranian ancient architecture

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2019年第3期13卷 716-724页

作者： maryam ZANDIYEHVAKILI Isa HOJAT Mehdi MAHMUDI Faculty of Architecture and Urban Development Art University of IsfahanIsfahanIran Faculty of Architecture College of Fine ArtsUniversity of TehranTehranIran

This research aims to enhance the interaction between a structure and its architectural *** a qualitative approach,the present work discovers some successfully used geometrical features of the Iranian ancient architecture in terms of the architectural-structural *** define four qualitative criteria for this assessment,i.e.,construction-ability,cost effectiveness,participation of the structure in fulfillment of the visual,and functional-semantic needs of the architectural *** this purpose,two case studies including the Jame Mosque of Isfahan and the Soltaniyeh building are *** outcomes of this research help designers to not only design efficient structures by adapting non-load bearing elements with the general form of the structure,but also meet concepts such as the unity or perfectionism in the structure.

关键词： architectural-structural interaction geometrical features structure architectural form Iranian ancient architecture

Numerical investigation of flow pattern and components of three-dimensional velocity around a submerged T-shaped spur dike in a 90° bend

维普期刊数据库评论

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 Central South University 2016年第11期23卷 2984-2998页

作者： Mohammad Vaghefi Yaser Safarpoor maryam Akbari Department of Civil Engineering Persian Gulf University

Spur dike is one of the river training structures. This work presented a numerical simulation of flow field and three-dimensional velocity around a T-shaped spur dike located in bend using SSIIM model. The main objective of this work is to investigate the three-dimensional velocities and streamlines at transverse and longitudinal sections and plan views around the T-shaped spur dike in different submergence ratios(0, 5%, 15%, 25% and 50%). It is concluded that by increasing the submergence ratio from 5% to 50%, the maximum of scour is reduced; the maximum of longitudinal velocity increases by 7.7% and occurs at the water surface in spur dike axis. Near the bed, the maximum of vertical velocity occurs at the end of spur wing. By analyzing the streamlines at transverse sections, the followings were deduced for different submergence ratios: different dimensions and different positions of vortices around the spur dike.

关键词： T-shaped spur dike flow pattern submergence ratio SSIIM model

The Release Behavior,Biocompatibility and Physical Properties of Aid-loaded Strontium Doped Calcium Phosphate Cement

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第6期17卷 1209-1223页

作者： maryam Mohammadi Sayed Mahmood Rabiee Saeed Hesaraki Department of Materials Engineering Babol Noshirvani University of TechmologyBabol 71167-47148Iran Nanotechnologv and Advanced Materials Materials and Energy Research CenterKaraj ***AlborzIran

The effect of concurrent attendance of two inhibitors of bone degradation,namely Alendronate(Aid)sodium trihydrate and Strontium(Sr),on Calcium Phosphate Cement(CPC)characteristics was *** this aim,5 wt%Strontium and 21 mM Alendronate sodium trihydrate were used in calcium phosphate cement and setting time,ion and drug release were ***264.7 and G cell were cultured on cement samples and Tartrate-Resistant Acid Phosphatase(TRAP),Alkaline phosphatase(ALP)activity and MTT assay were *** results of structural analysis indicated that 21 mM Aid did not let the cement ***,colloidal silica was added to the cement formula and successfully decreased the setting *** vitro tests showed Sr-loaded sample had a greater inhibitory effect on biocompatibility of G cells than Aid-loaded and Sr-Ald-loaded *** addition,the findings about osteoblast MTT and ALP activity indicated that Sr was more effective in osteogenic activity of G *** simultaneous presence of Aid and Sr in Calcium Phosphate Cement(CPC)was not as effective in its biocompatibility as the presence of Sr alone.

关键词： calcium phosphate cements drug release alendronate sodium trihydrate strontium RAW264.7 cell G cell

Advanced development in upstream of petroleum industry using nanotechnology

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第6期28卷 1483-1491页

作者： Sedigheh Sadegh Hassani maryam Daraee Zahra Sobat Catalysis research Division Research Institute of Petroleum Industry(RIPI)West Entrance Blvd.Olympic VillageP.O.Box 14857-33111TehranIran Nanotechnology Research Center Research Institute of Petroleum Industry(RIPI)West Entrance Blvd.Olympic VillageP.O.Box 14857-33111TehranIran

Nowadays,energy supply is one of the most important issues due to limitation of oil,gas and coal *** of rapid population,civilization and energy consumption growth,the improved technologies to make optimal use of the sources,solving related problems and finding new energy sources are *** than 10 years ago,nanotechnology as one of the most important technologies has also been applied to progress in the oil and gas industry(upstream,midstream and downstream).The experience of these years has shown that application of nanotechnology in the oil industry improves the exploration of crude oil and natural gas(underground or deep water),drilling and bringing the crude oil or raw natural gas to the surface,as well as transportation,storage,processing and purifying *** with high specific surface area,pore volume and small size show unique physical and chemical properties,which could be applied in several *** this regard,many researchers have been focused on various nanoparticles for upstream industries and studied their potential in oil exploration,drilling,production and enhanced oil recovery(EOR).Also,in downstream and midstream which involve refining of crude oil,processing and purifying of raw natural gas,transportation and storage of crude or refined petroleum products,the nanomaterials have been used to improve the quality of oil and make it appropriate for the *** sulfur gasoline,enhancing the octane number and coating the transportation system are among the goals that have been achieved successfully using *** this work,various types of nanoparticles such as metallic,metal oxide,hybrid nanoparticles,carbon nanomaterials,nano-composites and their applications in oil upstream industry are ***,their usage in different types of oil upstream processes is discussed.

关键词： Nanotechnology Oil exploration Oil drilling Nanoparticles Enhanced oil recovery

Incorporation of 3-dimensional lycopodium with hydrophobic nature and interconnected nano-channels into polyvinylidene fluoride membranes for desalination applications by vacuum membrane distillation

在线全文

学校读者我要写书评

暂无评论

化学科学与工程前沿:英文版 2023年第9期17卷 1162-1182页

作者： Saeed Seraj Toraj Mohammadi maryam Ahmadzadeh Tofighy Center of Excellence for Membrane Research and Technology Department of ChemicalPetroleum and Gas EngineeringIran University of Science and Technology(IUST)Tehran***Iran

In the present research,for the first time,lycopodium as a novel nanofiller was incorporated into a polyvinylidene fluoride matrix to fabricate lycopodium/polyvinylidene fluoride flat-sheet membrane for desalination applications by vacuum membrane distillation *** prepared lycopodium/polyvinylidene fluoride membranes and lycopodium were characterized by field emission scanning electron microscopy,X-ray diffraction,Fourier transform infrared,energy dispersive X-ray,and mapping *** contact angle and liquid entry pressure measurements were also *** surface methodology was applied to optimize membrane structure and *** optimized lycopodium/polyvinylidene fluoride membrane exhibits superior performance compared to the neat polyvinylidene fluoride membrane in terms of flux,salt rejection,water contact angle,and *** vacuum membrane distillation experiments,using a 15000 ppm NaCl solution as a feed at 70℃,the neat polyvinylidene fluoride membrane,optimum membrane,and agglomerated membrane(with high lycopodium loading)demonstrated 3.80,25.20,and 14.83 LMH flux and 63.30%,99.99%,99.96%salt rejection,*** improvement in flux and salt rejection of the optimized membrane was related to the presence of lycopodium with hydrophobic nature and interconnected nano-channels in membrane *** was found that lycopodium,as the most hydrophobic material,effectively influences the membrane performance and structure for membrane distillation applications.

关键词： lycopodium hoprobhobicity vucuum embrane distillation desalination

Size dependent free vibration analysis of functionally graded piezoelectric micro/nano shell based on modified couple stress theory with considering thickness stretching effect

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第1期17卷 119-134页

作者： maryam Lori Dehsaraji Mohammad Arefi Abbas Loghman Department of Solid Mechanics Faculty of Mechanical EngineeringUniversity of KashanKashanIran

Higher-order shear and normal deformation theory is used in this paper to account thickness stretching effect for free vibration analysis of the cylindrical micro/nano shell subjected to an applied voltage and uniform temperature *** dependency is included in governing equations based on the modified couple stress ***’s principle is used to derive governing equations of the cylindrical micro/nano *** procedure is developed using Navier technique for simply-supported boundary *** numerical results are presented to investigate the effect of significant parameters such as some dimensionless geometric parameters,material properties,applied voltages and temperature rising on the free vibration responses.

关键词： Thickness stretching effect Shear and normal deformation theory Vibration analysis Length scale parameter Modified couple stress theory