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International Journal of Minerals,Metallurgy and Materials 2016年第7期23卷 799-809页

作者： Ali Alavi nia Ali Shirazi department of Mechanical Engineering Bu-Ali Sina University

Friction stir welding is a new and innovative welding method used to fuse materials. In this welding method, the heat generated by friction and plastic flow causes significant changes in the microstructure of the material, which leads to local changes in the mechanical properties of the weld. In this study, the effects of various welding parameters such as the rotational and traverse speeds of the tool on the microstructural and mechanical properties of copper plates were investigated; additionally, Charpy tests were performed on copper plates for the first time. Also, the effect of the number of welding passes on the aforementioned properties has not been investigated in previous studies. The results indicated that better welds with superior properties are produced when less heat is transferred to the workpiece during the welding process. It was also found that although the properties of the stir zone improved with an increasing number of weld passes, the properties of its weakest zone, the heat-affected zone, deteriorated.

关键词： copper friction stir welding mechanical properties microstructure

EMC Improvement for High Voltage Pulse Transformers by Pareto-optimal design of a Geometry Structure Based on Parasitic Analysis and EMI Propagation

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CSEE Journal of Power and Energy Systems 2021年第5期7卷 1051-1063页

作者： Mohamad Saleh Sanjari nia Pourya Shamsi Mehdi Ferdowsi Missouri University of Science and Technology USA.

High voltage pulse transformers have an essential role in pulsed power systems and power conversion *** the electromagnetic behavior of such devices leads to better efficiency and low-level electromagnetic interference(EMI)noise propagation in *** this paper,a high voltage pulsed power system is considered and analyzed to improve their electromagnetic compatibility(EMC).The new generation of pulsed power systems that use SiC and GaN fast switches in capacitor charger power electronic circuits,face far more EMI ***,in this paper,the EMI propagation paths in the pulsed power system are realized and *** EMI noise level of the system is obtained and compared to the IEC61800-3 *** improve the EMC,the parasitic parameters of the transformer,as the main path of EMI circulation,are optimized to block the EMI propagation in the pulsed power *** achieve this result,the parasitics are modeled and calculated with a novel and accurate energy distribution ***,by defining a cost function,the geometry structure of the transformer is optimized to lower the parasitics in the *** pareto-optimal techniques are investigated for the cost function *** models and results are verified by the 3d-finite element method(FEM)and experimental results for several given *** and experimental verifications of this model,make the model suitable for any desirable design in any pulsed power ***,the EMI noise level of the system after optimization is shown and compared to the IEC61800-3 standard.

关键词： EMC/EMI geometry structure pareto-optimal techniques parasitics pulsed power system transformer

Combining Knowledge-and data-driven Fuzzy Approach to Evaluate Shelf-Life of Various Seafood Products

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Food Quality and Safety 2021年第4期5卷 351-360页

作者： Marzieh Moosavi-Nasab Sara Khoshnoudi-nia department of Food Science and Technology School of AgricultureShiraz UniversityShirazIran and"Seafood Processing Research GroupSchool of AgricultureShiraz UniversityShirazIran

due to the complexity of the deterioration process of seafood products,relying on one indicator is not adequate to determine the quality of such ***,shelf-life was estimated based on various indicators complicating the decision-making *** Support Systems are considered as a good *** current study aims to establish a simple and novel fuzzy model based on a combination of knowledge-and data-driven approaches to define a fuzzy quality deterioration index(FQdI)in various seafood products(rainbow trout,threadfin bream,and white shrimp samples)during cold *** volatile basic nitrogen(TVB-N)and psychrotrophic microorganisms counts(PMCs)were determined based on traditional *** sensory analysis was performed by a data-driven fuzzy ***,the shelf-life of the rainbow trout fillet was estimated to be 8 d,based on all the freshness ***,the shelf-life of the Japanese threadfin bream fillet was 5-7 d according to the microbial and chemical parameters,*** time for shrimp samples was 6-8 d using sensory score and TVB-N *** results of data-driven fuzzy approach showed all of the quality properties were considered as the'Important'-'Very Important'(defuzzification score>75).The TVB-N and PMCs were the most and weakest freshness quality properties(defuzzified-values:84.64 and 78.75,respectively).Based on FQdI,the shelf-life of the rainbow trout,Japanese threadfin bream,and shrimp samples were estimated to be 8,5,and 7 d,*** method was able to successfully provide a comprehensive deterioration index for evaluating the seafood *** a total index can be considered as a comprehensive output(y variable)to predict seafood freshness by rapid and nondestructive method.

关键词： decision Support Systems shelf-life fuzzy quality deterioration index seafood

An insight into the mechanical behavior of binary granular soils

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Particuology 2015年第4期13卷 82-89页

作者： F.Vahidi-nia A.Lashkari S.M.Binesh department of Civil and Environmental Engineering Shiraz University of Technology

This paper investigates the participation of the fines fraction in the load-carrying structure of binary mixtures of granular soils. For this purpose, various fractions of two fine sands were added to two coarse sands with the same particle size distribution, but different particle shape characteristics. Based on the results of 144 direct shear tests, it was found that fines participation in the load-bearing structure increases with fines content. At the same fines content, the participation of the fines in the load-carrying structure of loose mixtures is greater than in samples that were initially compacted. In addition, it was observed that fines participation rises with the increase in the average size of the fines fraction.

关键词： Sand Particle size ratio Fines content Fines participation factor lntergranular void ratio

Seismic performance and comparison of three different I beam to box column joints

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Earthquake Engineering and Engineering Vibration 2014年第4期13卷 717-729页

作者： Z.Saneei nia A.Mazroi M.Ghassemieh H.Pezeshki School of Civil Engineering College of Engineering University of Tehran department of Civil Engineering Central Branch of Azad University Building and Housing Researching Center

despite the inherently advantages of the box column, finding the best option for the I beam to the box column connection is the main challenge in using the box column as a structural member for special moment frames. In this paper, the seismic performance of urtreinforced connection, weakened connection and strengthened connection was evaluated through a comprehensive experimental program. The seismic comparisons were fabricated by assessing the strength, ductility and energy dissipation in each configuration. Three full scale tests with several connections were carried out. All the specimens were subjected to cyclic loading and prior to failure by forming a plastic hinge in the beam, all the connections managed to reach an inelastic rotation of more than 6.0% rad. The experimental and analytical results showed that the seismic performance of the strengthened connection with flange and shear plates turned out to be the most effective in the beam to the box column connection. Moreover, the normalized stress distribution of the continuity plates revealed that the possibility of the weld fracture in unreinforced connection is more than other specimens.

关键词： box column special moment frame unreinforced connection weakened connection strengthened connection seismic comparison

Microstructure and phase formation of mullite-Pr6O11 composite prepared by spark plasma sintering

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Journal of Rare Earths 2023年第2期41卷 283-289页

作者： Ehsan Ghasali davoud Ghahremani Yasin Orooji Aida Faeghi-nia Asghar Kazem-zadeh Touradj Ebadzadeh College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua 321004China Ceramic dept. Materials and Energy Research CenterAlborzIran department of Engineering Maybod BranchIslamic Azad UniversityMaybodIran

The present work investigates the effect of high praseodymium oxide(Pr6O11)content on the microstructure and phase formation of mullite(3Al_(2)O_(3)·2SiO_(2))precursor by means of the spark plasma sintering process.30 wt%Pr6O11was added to a mullite precursor consisting of aluminum nitrate nonahydrate and tetraethyl orthosilicate through a high energy mixer mill in ethanol *** spark plasma sintering was performed at a te mperature of 1200℃under 23 Pa vacuum co nditions by applying initial and final pressure of 10 and 30 MPa,*** analysis confirms the existence of mullite,alumina,Pr6O11,Pr2O3and quartz as the only crystalline *** images reveal an interesting deposition of hexagonal-shaped Al_(2)O_(3)particles on polished surfaces and complex oxide phases of the fiber network adhering to alumina particles in the form of tails seen on the fracture ***,the bending strength of 213±21 MPa,Vickers hardness of 9.3±0.1 MPa and fracture toughness of6.21±0.12 MPa·m1/2are obtained for the prepared composite.

关键词： Mullite Pr6O11 Composite Spark plasma sintering Rare earths

Thermogravimetric Studies of deposited Potash Impregnated for Flame-Retardancy into a Cotton Fabric

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Chinese Journal of Chemistry 2007年第7期25卷 926-929页

作者： MOSTASHARI, S.M. nia, Y.K. BALE, S. department of Chemistry Faculty of Science the University of Gilan Rasht lran

The effect of potash as a nondurable finish on the flammability of 100% cotton fabric （plain 180 g/m^2） was investigated. The bone-drled weighed fabrics were dipped into suitable concentrations of potash, with a volume of 100 mL at 20-2℃. The impregnation was followed by means of squeeze rolls and drying at 110 ℃. The samples were then reweighed with analytical precision. After conditioning overnight by using our ＂vertical flame tester＂ the optimum add-on values to impart flame-retardancy to cotton fabric was determined and expressed by 0.80 g of potash per 100 g fabric to be an efficient addition. Thermogravimetric analysis of pure cotton, treated cotton with potash at its optimum efficiency for donation of flame-retardancy into cotton fabric was fulfilled and the thermograms were compared and commented. The effectiveness of this hydroxide was attributed to the heat dissipation by the remaining consumed material during the combustion. The results obtained are in favor of ＂dust or Wall Effect Theory＂.

关键词： condensed phase retardation dust or wall effect theory flame-retardancy gas theory potash thermogravimetry

A New Species of Theloderma Tschudi,1838(Amphibia:Rhacoporidae)from Central Java Allied to ***(Boulenger,1903)

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Asian Herpetological Research 2023年第1期14卷 1-23,I0001页

作者： nia KURniaWAN Luhur SEPTIAdI Ahmad Muammar KAdAFI Muhammad FATHONI Kartika PRABASARI Panupong THAMMACHOTI department of Biology Faculty of Mathematics and Natural SciencesUniversitas BrawijayaMalangEast Java 65145Indonesia Wildlife Conservation Society Indonesia ProgramBogorWest Java 16128Indonesia department of Biology Faculty of Mathematics and Natural SciencesUniversitas Palangka RayaCentral Kalimantan 73112Indonesia department of Biology Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand

Species diversity of the genus Theloderma has been extensively studied in recent decades,with the majority of newly described species hailing from the Indochina *** describe a new species of mediumsized Theloderma based on molecular and morphological evidence from lowland forest in the southern part of Central Java Province,Indonesia,that is highly similar to and considered cryptic within the *** group.A phylogenetic approach shows that this population is a distinct genetic lineage and can be distinguished from its congeners by the absence of vomerine teeth,moderate irregular blunt warts and studded with calcified asperities on the dorsal skin,a distinct color pattern,and a distinct denticle formula in the *** the range of the new species is known only from Central Java,it cannot be ruled out that it may extends into adjacent areas,such as other parts of Java and Sumatra.

关键词： frogs molecular phylogeny Nusa Kambangan Island taxonomy Theloderma pseudohorridum sp.nov.

Exfoliation and Engineering of 2d Materials Through Electrochemistry

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CCS Chemistry 2024年第10期6卷 2368-2391页

作者： Sheng Yang Panpan Zhang Ali Shaygan nia Xinliang Feng Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 201203 State Key Laboratory of Material Processing and die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074 Center for Advancing Electronics dresden(cfaed) Faculty of Chemistry and Food ChemistryTechnische Universität DresdenDresden 01069 Max Planck Institute for Microstructure Physics Halle(Saale)06120

Two-dimensional(2d)materials offer countless possibilities for next-generation(opto)electronic devices because of their diverse and tailorable physicochemical *** bridge the gap between fundamental science and practical applications,simple-to-use universal approaches are essential for the mass production of 2d materials with specific target *** intercalation/exfoliation stands out from many up-scalable synthetic strategies,thanks to its great time efficiency,mild working conditions,and simple *** the use for direct exfoliation of 2d materials,device-level controllable intercalation of guest species often results in rich phase diagrams with competing orders and ground states in 2d systems,giving rise to new exotic quantum ***,making use of electrochemistry in ion intercalation and host–guest interaction is crucial to expand the library,as well as the function of 2d ***,we present a focused review of the exciting advances of electrochemical exfoliation and engineering of 2d materials,including intercalation strategies,intercalation chemistry,exfoliation mechanisms,material properties,and potential *** outlook on the major challenges and perspectives is also presented at the end of the discussion.

关键词： intercalation exfoliation 2d materials electrochemistry

Catalytic combustion of volatile organic compounds using perovskite oxides catalysts—a review

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1649-1676页

作者： Shan Wang Ping Xiao Jie Yang Sónia ACCarabineiro Marek Wiśniewski Junjiang Zhu Xinying Liu Institute for the development of Energy for African Sustainability College of ScienceEngineering and TechnologyUniversity of South AfricaJohannesburg 1710South Africa Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430200China LAQV-REQUIMTE Department of ChemistryNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516 CaparicaPortugal Physicochemistry of Carbon Materials Research Group Faculty of ChemistryNicolaus Copernicus University in Toruń87-100 ToruńPoland Zhijiang College of Zhejiang University of Technology Shaoxing 312030China

With the rapid development of industry,volatile organic compounds(VOCs)are gaining attention as a class of pollutants that need to be eliminated due to their adverse effects on the environment and human *** combustion is the most popular technology used for the removal of VOCs as it can be adapted to different organic emissions under mild *** review first introduces the hazards of VOCs,their treatment technologies,and summarizes the treatment mechanism ***,the characteristics and catalytic performance of perovskite oxides as catalysts for VOC removal are expounded,with a special focus on lattice distortions and surface defects caused by metal doping and surface modifications,and on the treatment of different *** challenges and the prospects regarding the design of perovskite oxides catalysts for the catalytic combustion of VOCs are also *** review provides a reference base for improving the performance of perovskite catalysts to treat VOCs.

关键词： perovskite oxides volatile organic compounds catalytic combustion reaction mechanism