检索结果-南通市图书馆

Simulation of cooling channel rheocasting process of A356 aluminum alloy using three-phase volume averaging model

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊:英文版 2005年第2期15卷 389-394页

作者： T.Wang b.Pustal M.Abondano T.Grimmig a.bührig-polaczek M.Wu A.Ludwig Foundry Institute Aachen University of TechnologyAachenD-52072Germany Department of Metallurgy University of LeobenLeobenA-8700Austria Research Center of Foundry Engineering Dalian University of TechnologyDalian 116024China

The cooling channel process is a rehocasting method by which the prematerial with globular microstructure can be produced to fit the thixocasting process.A three-phase model based on volume averaging approach is proposed to simulate the cooling channel process of A356 Aluminum *** three phases are liquid,solid and air respectively and treated as separated and interacting continua,sharing a single pressure *** mass,momentum,enthalpy transport equations for each phase are *** developed model can predict the evolution of liquid,solid and air fraction as well as the distribution of grain density and grain *** effect of pouring temperature on the grain density,grain size and solid fraction is analyzed in detail.

关键词： A356 alloy modeling cooling channel three-phase semi-solid

Thixocasting combination spanners using stainless steel X39CrMo17

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2010年第S3期20卷 998-1004页

作者： M.büNCK E.SUbASIC a.bührig-polaczek K.JIANG S.MüNSTERMANN J.M.SCHNEIDER K.FICKERT H.J.GüNTHER Foundry Institute at RWTH Aachen University AachenGermany Materials Chemistry at RWTH Aachen University AachenGermany HAZET-Hermann Zerver GmbH & Co.KG RemscheidGermany PlaTeG GmbH SiegenGermany

Forging is state-of-the-art for producing hand tools on an industrial *** to high demands on the stiffness and the fracture toughness,high-strength forging steels were used to provide cavity-free components with high mechanical load ***,forging is a cost-effective mass production process but,in spite of all its advantages,it has its limitations,*** the freedom of ***,because of the extreme thermal loading(particularly with regard to permanent moulds) and the frequently unavoidable casting defects,hand tools are not *** means of thixocasting steel,technical difficulties can be reduced and new options are provided which allow the manufacturing of components with much higher complexity than that using *** near-net shape production,manufacturing steps and costs can be ***,steels,which are difficult to forge but nonetheless have high potential for specific applications(such as high strength or corrosion resistant steels),can also be *** cooperation with industrial partners,X39CrMo17 stainless steel combination spanners with 17 mm width across flats were *** dies were designed and optimized by simulation,the hot forming X38CrMoV5 tool steel as well as the molybdenum alloy TZM were selected as the tool *** dies were treated by a plasma nitriding process and subsequently coated with crystalline Al2O3 protective coatings by plasma-enhanced chemical vapor deposition(PECVD).During the experiments,combination spanners were successfully cast in the semi-solid *** parts were heat-treated to enhance the toughness of components,which was subsequently measured by a standardized torque ***,a hypothetical approach of a possible,industrial batch process was carried out using the simulation software MAGMAsoft.

关键词： thixocasting X39CrMo17 steel casting semi-solid MAGMAsoft simulation

Iron regulatory protein 1: the deadly switch of ferroptosis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第3期19卷 477-478页

作者： Daniel a.bórquez Pamela J.Urrutia Center for biomedical Research Faculty of MedicineUniversidad Diego PortalesSantiagoChile Institute of Nutrition&Food Technology(INTA) Universidad de ChileSantiagoChile Geroscience Center for brain Health and Metabolism SantiagoChile

Ferroptosis,an iron-dependent cell death:Ferroptosis is a type of regulated necrosis,characterized by redox-active iron accumulation and increased free radical production derived by Fenton chemistry,that triggers oxidation of polyunsaturated fatty acids in phospholipids,loss of cellular membranes integrity,and leakage of intracellular contents.

关键词： integrity switch Iron

在线全文

学校读者我要写书评

暂无评论

镍基高温合金铸件界面的雀斑缺陷形成研究

镍基高温合金铸件界面的雀斑缺陷形成研究

Trust-based Intelligent Scheme for Mitigating black Hole Attacks in IoT

第十三届中国高温合金年会

作者：洪建平马德新王俊孙宝德 a.bührig-polaczek 上海交通大学金属基复合材料国家重点实验室 Foundry Institute RWTH University Aachen

本研究利用工业级birdgman真空定向凝固炉对CMSX-4和CM247 LC两种镍基高温合金内部多界面结构试样进行了定向凝固实验。结果表明,雀斑缺陷不仅在铸件外表面出现,同时也在铸件内部合金与陶瓷材料界面附近产生。分析认为糊状区内界面附近...

本研究利用工业级birdgman真空定向凝固炉对CMSX-4和CM247 LC两种镍基高温合金内部多界面结构试样进行了定向凝固实验。结果表明,雀斑缺陷不仅在铸件外表面出现,同时也在铸件内部合金与陶瓷材料界面附近产生。分析认为糊状区内界面附近的热熔质对流受到的阻力小于它在枝晶间区域的阻力,熔体在界面附近的流动性优于其在枝晶间区域。所以,铸件中界面的存在会增加高温合金铸件产生雀斑缺陷的风险。该实验结果为镍基高温合金单晶空心叶片内部可能产生雀斑缺陷提供了实验依据。

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Ha.bin Institute of Technology(New Series) 2024年第3期31卷 39-50页

作者： Feroz Khan a.b Weslin D Dilli babu M Mohammed Muzaffar Hussain Department of Computer Science Syed Hameedha Arts and Science CollegeKilakarai 623806Tamil NaduIndia Department of Information Technology Mohamed Sathak AJ College of EngineeringSiruseriChennai 603103India Department of Information Technology Panimalar Engineering CollegeChennai 600123India Department of Information Technology C.Abdul Hakeem College of Engineering and TechnologyMelvisharam 632509India

Internet of Things(IoT)networks are characterized by a multitude of wireless,interconnected devices that can dynamically join or exit the network without centralized administration or fixed infrastructure for *** multipath routing in IoT networks can improve data transmission reliability and load balancing by establishing multiple paths between source and destination nodes,these networks are susceptible to security threats due to their wireless *** security solutions developed for conventional networks are often ill-suited to the unique challenges posed by IoT *** response to these challenges,this paper proposes the integration of the Ad hoc On-demand Multipath Distance Vector(AOMDV)routing protocol with a trust model to enhance network *** findings from this research demonstrate the successful fusion of AOMDV with a trust model,resulting in tangible improvements in network *** assessment of trustworthiness bolsters both security and routing capabilities in IoT *** trust model plays a crucial role in mitigating black hole attacks in IoT networks by evaluating the trustworthiness of nodes and helping in the identification and avoidance of malicious nodes that may act as black *** results validate the efficacy of the proposed trust-based routing mechanism in achieving its *** plays a pivotal role in decision-making and in the creation of secure distribution *** assessing the trustworthiness of nodes,both network security and routing efficiency can be *** effectiveness of the proposed trust-based routing mechanism is scrutinized through simulations,offering insights into its potential advantages in terms of improved network security and routing performance in the context of the IoT.

关键词： Mobile ad-hoc network(MANET) routing Ad hoc On-demand Multipath Distance Vector(AOMDV) trust model security

black hole shadows in Einstein-bel-Robinson gravity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第5期48卷 272-283页

作者： b.Hamil b.C.Lütfüoğlu Laboratoire de Physique Mathématique et Subatomique Facultédes Sciences ExactesUniversitéConstantine 1ConstantineAlgeria Department of Physics University of Hradec KrálovéRokitanského 6250003 Hradec KrálovéCzechia

Gravity models given by higher-order scalar curvature corrections are believed to bear important consequences. Einstein-bel-Robinson (EbR) gravity with quartic curvature modification motivated Sajadi et al. to explore static spherically symmetric black hole solutions using perturbative methods. In this study, inspired by their work, we investigate AdS black hole shadows in EbR gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same problem in the presence of plasma, because the black holes are thought to be surrounded by a medium that changes the geodesic of photons.

关键词： black hole shadows Einstein-bel-Robinson gravity plasma

Water Vapor Information from Satellite and Its Applications

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2024年第1期41卷 188-189页

作者： b.J.SOHN School of Earth and Environmental Sciences Seoul National UniversitySeoul 08826Korea

Water vapor is a critical component of the hydrological cycle because it plays a vital role in transporting water from one part of the cycle to *** vapor evaporated from surfaces such as oceans,lakes,and rivers conden... 详细信息

关键词： motion oceans lakes

Soils in extraterrestrial space: Need for studies under microgravity

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第1期34卷 13-14页

作者： M.b.KIRKHAM Department of Agronomy Kansas State UniversityManhattan KS 66506USA

With the increased interest of plants in space, gravity cannot be ignored when studying soil-plant-water relations. Therefore, it is important to understand the water relations of soils under zero gravity in space or under reduced gravity on the Moon or Mars. This paper outlines the problems of moving water in soils under zero gravity or microgravity, as well as growing plants in these soils. It is suggested that microgravity experiments could be done on Earth using both soils and plants. Results from such experiments could be used to grow plants when mankind establishes bases on the Moon and Mars.

关键词： soils soil bases

CompactChain:an efficient stateless chain for UTXO-model blockchain

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第2期18卷 167-179页

作者： b Swaroopa REDDY T Uday Kiran REDDY Department of Electrical Engineering Indian Institute of Technology HyderabadHyderabadTelangana 502285India

In this work,we propose a stateless blockchain called CompactChain,which compacts the entire state of the UTXO(Unspent Transaction Output)based blockchain systems into two RSA *** first accumulator is called Transaction Output(TXO)commitment which represents the TXO *** second one is called Spent Transaction Output(STXO)commitment which represents the STXO *** this work,we discuss three algorithms:(i)To update the TXO and STXO commitments by the *** miner also provides the proofs for the correctness of the updated commitments;(ii)To prove the transaction’s validity by providing a membership witness in TXO commitment and non-membership witness against STXO commitment for a coin being spent by a user;(iii)To update the witness for the coin that is not yet spent;The experimental results evaluate the performance of the CompactChain in terms of time taken by a miner to update the commitments and time taken by a validator to verify the commitments and validate the *** compare the performance of CompactChain with the existing state-of-the-art works on stateless *** shows a reduction in commitments update complexity and transaction witness size which inturn reduces the mempool size and propagation latency without compromising the system throughput(Transactions per second(TPS)).

关键词： stateless blockchain RSA Accumulator STXO commitment TXO commitment UTXO Non-interactive Proof of Exponentiation(NI-PoE) Transactions per second(TPS)