检索结果-南通市图书馆

Introducing scalable 1-bit full adders for designing quantum-dot cellular automata arithmetic circuits

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2022年第8期23卷 1264-1276页

作者： Hamideh KHAJEHNASIR-JAHROMI Pooya TORKZADEH massoud dousti Department of Electrical and Computer Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran

Designing logic circuits using complementary metal-oxide-semiconductor(CMOS)technology at the nano scale has been faced with various challenges *** leakage currents,the short-effect channel,and high energy dissipation are some of the ***-dot cellular automata(QCA)represent an appropriate alternative for possible CMOS replacement in the future because it consumes an insignificant amount of energy compared to the standard *** key point of designing arithmetic circuits is based on the structure of a 1-bit full adder.A low-complexity full adder block is beneficial for developing various intricate *** paper represents scalable 1-bit QCA full adder structures based on cell *** proposed full adders encompass preference aspects of QCA design,such as a low number of cells used,low latency,and small area ***,the proposed structures have been expanded to larger circuits,including a 4-bit ripple carry adder(RCA),a 4-bit ripple borrow subtractor(RBS),an add/sub circuit,and a 2-bit array *** designs were simulated and verified using QCA Designer-E version *** tool can estimate the energy dissipation as well as evaluate the performance of the *** results showed that the proposed designs are efficient in complexity,area,latency,cost,and energy dissipation.

关键词： Quantum-dot cellular automata(QCA) Full adder Ripple carry adder(RCA) Add/sub circuit Multiplier

A creative concept for designing and simulating quaternary logic gates in quantum-dot cellular automata

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2021年第11期22卷 1541-1550页

作者： Alireza NAVIDI Reza SABBAGHI-NADOOSHAN massoud dousti Department of Electrical and Computer Engineering Science and Research BranchIslamic Azad UniversityTehran***Iran Department of Electrical Engineering Central Tehran BranchIslamic Azad UniversityTehran***Iran

New technologies such as quantum-dot cellular automata(QCA) have been showing some remarkable characteristics that standard complementary-metal-oxide semiconductor(CMOS) in deep sub-micron cannot afford. Modeling systems and designing multiple-valued logic gates with QCA have advantages that facilitate the design of complicated logic circuits. In this paper, we propose a novel creative concept for quaternary QCA(QQCA). The concept has been set in QCASim, the new simulator developed by our team exclusively for QCAs’ quaternary mode. Proposed basic quaternary logic gates such as MIN, MAX, and different types of inverters(SQI, PQI, NQI, and IQI) have been designed and verified by QCASim. This study will exemplify how fast and accurately QCASim works by its handy set of CAD tools. A 1×4 decoder is presented using our proposed main *** points such as the minimum delay, area, and complexity have been achieved in this work. QQCA main logic gates are compared with quaternary gates based on carbon nanotube field-effect transistor(CNFET). The results show that the proposed design is more efficient in terms of latency and energy consumption.

关键词： Quantum-dot cellular automata(QCA) Quaternary logic QCASim Quaternary QCA(QQCA) Quaternary decoder Quaternary gates

Biostratigraphy,Microfacies and Depositional Environment of the Sarvak Formation at the Pyun Anticline(Zagros Basin,Southwest of Iran)

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2021年第5期95卷 1647-1667页

作者： Mahtab dousti MOHAJER Massih AFGHAH Mohammadsadegh DEHGHANIAN Seyed Jamal SHEIKH ZAKARIAII Department of Geology Science and Research BranchIslamic Azad UniversityTehranIran Department of Geology Shiraz BranchIslamic Azad UniversityShirazIran Department of Geology Bandar Abbas BranchIslamic Azad UniversityBandar AbbasIran

The Sarvak Formation is a carbonate sequence of Late Albian–Early Turonian age in Zagros Basin in *** this investigation,the Sarvak Formation at the Pyun Anticline section(Izeh Zone)has been *** consists of 797 m thick limestone which overlies the Kazhdumi Formation conformably and underlies the Gurpi Formation unconformably at the Pyun Anticline.A very rich fossil association(85 genera and 132 species)characterizes the Pyun *** on the stratigraphic distribution of diagnosed foraminifera,five biozones are established:1,Muricohedbergella-Globigerinelloides *** zone(Late Albian);2,Praealveolina iberica-Chrysalidina gradata interval zone(Early Cenomanian);3,Chrysalidina gradata-Cisalveolina fraasi(fallax)and *** interval zone(Middle Cenomanian);4,***(fallax)and ***-Praetaberina bingistani assemblage zone(Late Cenomanian);5,Nezzazatinella picardi-MangashtiaDicyclina assemblage zone(Early Turonian).Based on the petrographic and sedimentological analyses,some 13 carbonate microfacies were *** investigated microfacies confirm a ramp-type *** microfacies,from distal to proximal environments,consist of:MF1:planktonic foraminifera wackestone-packstone;MF2:Oligostegina planktonic foraminifera wackestone to packstone;MF3:planktonic-benthic foraminifers sponge spicules wackestonepackstone;MF4:rudist floatstone;MF5:rudist rudstone;MF6:bioclast intraclast grainstone;MF7:peloid intraclast grainstone;MF8:benthic foraminifers rudist grainstone-packstone;MF9:peloid bioclast grainstone-packstone;MF10:bioclast(benthic foraminifers)wackestone-packstone;MF11:peloid bioclast packstone;MF12:dacycladacea benthic foraminifera packstone-wackestone;MF13:miliolids wackestone-packstone.

关键词： Sarvak Formation biostratigraphy microfacies Pyun Izeh Zone Zagros Basin

Wetting of MXenes and Beyond

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第8期15卷 141-153页

作者： massoud Malaki Rajender S.Varma Department of Mechanical Engineering Isfahan University of TechnologyDaneshgah e Sanati HwyKhomeyni ShahrIsfahan 84156‑83111Iran Regional Centre of Advanced Technologies and Materials Palacky University in OlomoucŠlechtitelů2778371 OlomoucCzech Republic

MXenes are a class of 2D nanomaterials with exceptional tailormade properties such as mechano-ceramic nature,rich chemistry,and hydrophilicity,to name a ***,one of the most challenging issues in any composite/hybrid system is the interfacial *** a superior integrity of a given composite system is a direct consequence of the proper *** wetting is a fundamental feature,dictating many physical and chemical attributes,most of the common nanomaterials possesses poor affinity due to hydrophobic nature,making them hard to be easily dispersed in a given *** to low contact angle,MXenes can offer themselves as an ideal candidate for manufacturing different nano-hybrid *** this review,it is aimed to particularly study the wettability of *** terms of the layout of the present study,MXenes are first briefly introduced,and then,the wettability phenomenon is discussed in *** reviewing the sporadic research efforts conducted to date,a particular attention is paid on the current challenges and research pitfalls to light up the future *** is strongly believed that taking the advantage of MXene’s rich hydrophilic surface may have a revolutionizing role in the fabrication of advanced materials with exceptional features.

关键词： MXene Wetting Hydrophilicity Composites 2D material

Structural characterization of AA 2024-MoSi_2 nanocomposite powders produced by mechanical milling

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第3期20卷 298-306页

作者： Mahmood Sameezadeh Hassan Farhangi massoud Emamy Center of Excellence for High Performance Materials School of Metallurgy and Materials College of Engineering University of Tehran

Nano-sized MoSi2 powder was produced successfully from commercially available MoSi2 by a mechanical milling process carried out for 100 h, and mechanical alloying was employed to synthesize AA 2024-MoSi2 nanocomposites, The effects of MoSi2 reinforcement and mechanical milling on the structure, morphology, and iron contamination of the produced materials were investigated using X-ray diffraction, scanning electron microscopy, and atomic absorption spectrometry. It is revealed that the morphology of the aluminum alloy changes continuously during milling from spherical to plate-like, irregular, and finally equiaxed. The presence of MoSi2 reinforcement accelerates the milling process and results in a smaller average particle size. The Williamson-Hall method determined that the crystallite size of the aluminum alloy in the composite powder is smaller than that of the unreinforced alloy at the same milling time and this size reaches 45 nm after 16 h milling time. The Fe contamination content is higher for the nanocomposite in comparison with the unreinforced alloy because of the wearing role of MoSi2 hard particles.

关键词： nanocomposites aluminum alloys mechanical milling microstructure

Investigation of secondary phases and tensile strength of nitrogen-containing Alloy 718 weldment

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1259-1268页

作者： Behrooz Nabavi massoud Goodarzi Abdul Khaliq Khan School of Metallurgy and Materials Engineering Iran University of Science and TechnologyTehran ***Iran Department of Mechanical Engineering Manitoba Institute for MaterialsUniversity of ManitobaWinnipeg R3T 2N2Canada

The influence of nitrogen content on the precipitation of secondary phases and the tensile strength of Alloy 718 during gas tungstenarc welding was investigated. Various types of precipitates were characterized using scanning electron microscopy and transmission electronmicroscopy. The results showed that in the fusion zone, the volume fraction of Nb-rich phases such as Laves, (Nb,Ti)C, and δ phases, as wellas Ti-rich phases such as (Ti,Nb)CN and (Ti,Nb)N, increased with increase in the nitrogen content due to the microsegregation of Nb and Tiwithin interdendritic areas. Nitrogen was also found to decrease the size of γ′′ particles within γ dendrites. For precipitates in the partiallymelted zone, constitutional liquation was observed for both (Nb,Ti)C and (Ti,Nb)N particles. Based on the results of tensile tests, the weld containing0.015wt% nitrogen exhibited the highest ultimate tensile strength (UTS), whereas more addition of nitrogen led to a decrease in both theUTS and yield strength due to the increased content of brittle Laves phases and decreased size of γ′′.

关键词： nitrogen secondary phases gas tungsten arc welding tensile strength Alloy 718

Authenticated Key Agreement Protocol

在线全文

学校读者我要写书评

暂无评论

China Communications 2010年第5期7卷 1-8页

作者： massoud Hadian Dehkordi Reza Alimoradi Department of Mathematical Sciences Iran University of Science and Technology Narmak Tehran Iran Research Center of Intelligent Signal Processing Tehran Iran

Key agreement and identification protocols are much applicable among current protocols in cryptography. These protocols are used for a secure communication through an insecure channel in a network like Internet. Challenge-response identification protocol is an important identification method. In this paper, by making some slight changes in the public-key-based challenge-response identification protocol, we have introduced a new scheme in which the users in addition to authenticating each other can also agree on multiple keys. Then, this protocol＇s security from both aspects regarding the identification and key agreement will be analyzed. At the end, we will prove our scheme has a high security and efficiency in comparison with some famous and similar protocols.

关键词： identification multiple key agreement pairing challenge-response strong security

Effects of Zr additions on structure and tensile properties of an Al-4.5Cu-0.3Mg-0.05Ti(wt.%) alloy

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

China Foundry 2022年第1期19卷 9-16页

作者： Hamed Kamali Erfan Kamali massoud Emamy School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Faculty of Materials Engineering Sahand University of TechnologyP.O.Box 51335-1996TabrizIran

The effects of different Zr additions(0.05wt.%-0.5wt.%)on the structure and tensile properties of an Al-4.5Cu-0.3Mg-0.05Ti(wt.%)alloy solidified under a high cooling rate(18℃·s^(-1)),in as-cast and T6 heat-treated conditions were *** as-cast structure of the alloy consists of equiaxed grains ofα-Al with an average size of 64μm which is unaffected by the Zr additions,indicating the ineffectiveness of Zr in the grain refinement of the *** electron microscopy,along with X-ray diffraction analysis revealed the presence of elongatedθ-Al2Cu at the grain boundaries;in addition,coarse Al3Zr particles exist in the intergranular regions of the 0.5wt.%Zr-containing *** the T6 heat treatment,the elongatedθparticles were fragmented;however,the coarse Al3Zr particles remained unchanged in the ***,the formation of fineβ’-Al3Zr andθ’’-Al3Cu/θ’-Al2Cu phases during T6 heat treatment was revealed by transmission electron *** results of the tensile tests showed that the Zr additions increase the strength of the alloy in both as-cast and T6 heat-treated conditions,but reduce its elongation,especially with 0.5wt.%Zr *** 0.3wt.%Zr-added alloy in the T6 heat-treated condition has the highest quality index value(249 MPa).Fractography of the fracture surfaces of the alloys revealed ductile fracture mode including dimples and cracked intermetallic phases in both conditions.

关键词： Al-Cu-Mg alloys casting T6 heat treatment structure precipitation hardening tensile properties fractography

A novel and efficient multiparty quantum secret sharing scheme using entangled states

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1828-1831页

作者： massoud Hadian Dehkordi ELHAM Fattahi School of Mathematics Iran University of Science and TechnologyTehran ***Iran

We proposed a novel and efficient multiparty quantum secret sharing scheme using entangled state which in that the number of parties can be arbitrary *** state which we used,has special properties that make our scheme simple and *** operations which are needed to recover secret message,are only exclusive-or addition and complement *** it is shown that this scheme is secure against *** this scheme provides the best quantum bit efficiency compared with some famous quantum secret sharing schemes.

关键词： quantum secret sharing entangled state multiparty quantum cryptography