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Effect of Mg and semi solid processing on microstructure and impression creep properties of A356 alloy

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Transactions of Nonferrous Metals Society of China 2013年第9期23卷 2518-2523页

作者： b.AMIR ESGANDARI b.nami M.SHAHMIRI A.AbEDI School of Metallurgy and Materials Engineering Iran University of Science and Technology Department of Mechanical Engineering Shahid Rajaee Teacher Training University

The effects of Mg and semi solid processing on the creep properties ofA356 A1 alloy were investigated. The results show that the dislocation climb controlled creep is the dominant creep mechanism and it is not affected by the semi solid processing and further addition of Mg. Mg improves the alloy creep properties probably by forming large Chinese script Mg2Si compounds at the interdendritic regions. The semi solid processed specimens exhibit better creep properties in comparison with the as cast ones. It is attributed to the reduction in the stacking fault energy resulting from the significant dissolution of Mg in the a（A1） phase.

关键词： A356 alloy microstructure semi solid processing impression creep dislocation climb controlled creep

Effect of Ca addition on microstructure and impression creep behavior of cast AZ61 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2019年第10期29卷 2056-2065页

作者： b.nami S.M.MIRESMAEILI F.JAMSHIDI I.KHOUbROU Department of Materials Engineering and New Technologies Shahid Rajaee Teacher Training University

Microstructure and creep properties of AZ61 alloy containing 1 and 3 wt.% Ca were investigated. The creep properties were examined using impression method under different stresses between 200 and 500 MPa at the temperature ranging from 423 to 491 K. The microstructure of AZ61 alloy contains α(Mg) matrix and Mg17 Al12 intermetallic phases. It is shown that adding Ca to AZ61 alloy reduces the amount of Mg17 Al12 phase via forming(Mg,Al)2 Ca phase;furthermore, increasing the Ca content to 3 wt.% leads to the formation of(Mg,Al)2 Ca phase, as well as the elimination of the Mg17 Al12 phase. Creep properties of AZ61 alloy are improved with the Ca addition. The improvement in creep properties is attributed to the reduction in the amount of Mg17 Al12 phase and the formation of(Mg,Al)2 Ca phase with high thermal stability. According to the obtained creep data, it is concluded that the pipe diffusion-climb controlled dislocation creep is the dominant creep mechanism and Ca addition has no influence on this mechanism. The effect of pre-deformation on the creep properties of AZ61+3%Ca alloy reveals that the creep resistance of the alloy depends on the continuity of(Mg,Al)2 Ca phase. It is decreased by reducing the phase continuity.

关键词： impression creep magnesium alloy Ca addition dislocation creep phase continuity

Microstructure and Impression Creep Properties of Ca-Containing AS31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2016年第12期29卷 1089-1097页

作者： Mohammad badri Seyyed Mehdi Miresmaeili bahram nami Shahid Rajaee Teacher Training University Lavizan TehranIran

The effect of Ca addition on the microstructure and impression creep properties of AS31 magnesium alloy was investigated in the current study. The results showed that the microstructure of AS31 alloy is composed of α（Mg） phase, massive Mg17Al12 and some Chinese script Mg2Si compounds. Addition of 2 wt% Ca to AS31 alloy resulted in complete elimination of MglTAl12 phase and formation of Al2Ca compound. Ca improved the alloy＇s creep properties especially at higher temperature. Improvement in the creep properties was attributed to the elimination of soft Mg17Al12 and formation of thermally stable Al2Ca compound. According to the obtained stress exponent and creep activation energy, pipe diffusion climb-controlled creep was estimated as the dominant creep mechanism and Ca had no influence on the dominant mechanism.

关键词： Magnesium-aluminum-silicon alloy Calcium Microstructure Creep Mechanism

Neuroinflammation revisited through the microglial lens

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Neural Regeneration Research 2025年第7期20卷 1989-1990页

作者： Renato Socodato João b.Relvas Institute of Research and Innovation in Health(i3S)and Institute for Molecular and Cell biology(IbMC) University of PortoPortoPortugal Department of biomedicine Faculty of Medicine of the University of Porto(FMUP)PortoPortugal

Neuroimmunology is emerging as a pivotal field,shedding light on the intricate dialogues between the central nervous system(CNS)and the immune *** exploration is particularly significant in understanding microglia,the CNS’s innate immune cells,beyond the conventional conflation of“neuroinflammation”and“microglial activation.”This conflation has clouded the true complexity of these processes,potentially stalling scientific progress and the development of new *** challenge the long-standing perspectives that have oversimplified these interactions,advocating for a deeper exploration of the dynamic relationship between neuroinflammation and microglial *** dissecting specific molecular pathways,we aim to illuminate their elaborate roles in neuroinflammatory responses,especially in the context of Alzheimer’s disease(AD).Here,neuroinflammation is not merely a passive observer or a direct antagonist but a complex agent in the disease’s *** article calls for a significant paradigm shift towards an integrative,multi-omics approach to *** such a comprehensive framework is crucial for advancing our understanding of neuroinflammatory conditions and paving the way for targeted therapeutic strategies for brain diseases.

关键词： inflammation simplified activation

Performance of fluoride and boron compounds against drywood and subterranean termites and decay and mold fungi

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Journal of Forestry Research 2020年第4期31卷 1425-1434页

作者： S.nami Kartal Evren Terzi Tsuyoshi Yoshimura Faculty of Forestry Istanbul University-Cerrahpas¸a34473 BahcekoyIstanbulTurkey RISH Kyoto UniversityUjiKyoto 611-1100Japan

Sodium fluoride(NaF)and disodium octaborate tetrahydrate(DOT)are well-known fungicides for preventing and remediating decay in wood and wood structures,due to their excellent diffusion properties in *** efficacy of both compounds against drywood termites is,however,inadequately studied;there is a lack of information on the development of proper protection and control methods against drywood termites using these diffusible *** this study,the threshold values of fluoride and boron against drywood and subterranean termites and decay and mold fungi were assessed in laboratory *** Cryptomeria japonica ***(sugi)sapwood specimens with four different concentrations of NaF and DOT applied by either dipping or vacuum processes were subjected to attack by drywood termites,Incisitermes minor(Hagen)for 6 *** specimens were also tested against subterranean termites,Coptotermes formosanus Shiraki for 3 *** decay and mold resistance tests were then performed to determine the efficacy of the compounds against fungal *** showed 80%or greater drywood termite mortality in wood specimens treated with NaF at a retention level of1.7 kg m-3 or *** DOT treated groups,higher retention levels(greater than 6.8 kg m-3)were needed to reach up to 80%or more termite *** general,weight losses in NaF-treated specimens were slightly lower than those in DOT-treated *** levels of around1.2 kg m-3 for NaF and 1.6 kg m-3 for DOT were high enough to reach the JIS K 1571 threshold requirement of weight loss less than 3%in subterranean termite resistance *** higher termite mortality values were seen in the DOT than NaF treatments at respective retention *** decay resistance tests,no weight losses were seen at a NaF retention level of 2.3 kg m-3;however,a retention level of nearly 4 kg m-3 for DOT was needed for complete protection against both test *** most cases,lower weight losses were obtained i

关键词： NaF DOT Remedial treatments Termites Fungi

Efficient Synthesis of 2-Arylamino-2-imidazolines and 2-Aminobenzimidazoles with Aminoiminomethanesulfonic Acid Derivatives

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Chinese Journal of Chemistry 2011年第5期29卷 1055-1058页

作者： Mohanazadeh Farajollah nami Navabe Hosseini Samine Sadat Institute of Industrial Chemistry Iranian Research Organization for Science and Technology Tehran Iran Department of Chemistry Azad Islamic University Babol lran

A highly efficient synthesis of 2-arylamino-2-irnidazolines and 2-aminobenzimidazoles from aminoiminomethanesulfonic acid derivatives is described. The method is simple and practical, generating imidazoline and benzim... 详细信息

关键词： 2-arylamino-2-imidazoline 2-aminobenzimidazole synthesis cyclization heterocycle aminoimi nomethanesulfonic acid ureas

Movement of boron from ulexite and colemanite minerals in sapwood and heartwood of Cryptomeria japonica

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Journal of Forestry Research 2020年第6期31卷 2597-2603页

作者： Saip nami Kartal Evren Terzi Aysel Kanturk Figen Tsuyoshi Yoshimura Department of Forest biology and Wood Protection Technology Faculty of Forestry Istanbul University-Cerrahpaşa34473 BahcekoyIstanbulTurkey Department of Chemical Engineering Faculty of Chemistry-MetallurgicalYıldız Technical UniversityDavutpasa Esenler34210 IstanbulTurkey Laboratory of Innovative Humano-Habitability Research Institute for Sustainable Humanosphere(RISH)Kyoto UniversityUjiKyoto 611-0011Japan

This study evaluated boron diff usion from raw boron minerals ulexite and colemanite with low water solubility in comparison to disodium octaborate tetrahydrate(DOT).Tests were conducted using sugi(Cryptomeria japonica(L.)***)sapwood and heartwood blocks conditioned to 30,60,and 90%target moisture *** blocks were fi lled with the boron compounds through treatment holes and diff usion was observed at three assay zones across the blocks after 7,30,60 or 90-day incubation period at room *** comparison,ethylene glycol was also introduced into the holes to elevate boron diff *** expected,diff usion increased with increased moisture content and levels were higher at the 60%and 90%moisture levels compared to the 30%*** some exceptions,boron levels did not follow consistent gradients with distance away from the treatment *** of ethylene glycol helped increase boron levels,even in heartwood *** levels were higher from the ulexite source than from colemanite;however,DOT treatments resulted in the highest boron diff usion rates as a result of greater water solubility compared to both raw boron *** results suggest that ulexite together with ethylene glycol may be useful in both sapwood and heartwood materials when kept at high moisture levels for extended periods.

关键词： boron Remedial Ulexite Colemanite DOT Distribution Sapwood Heartwood

biological performance,water absorption,and swelling of wood treated with nano-particles combined with the application of Paraloid b72~

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Journal of Forestry Research 2017年第2期28卷 381-394页

作者： Damla Muhcu Evren Terzi S.nami Kartal Tsuyoshi Yoshimura Department of Forest biology and Wood Protection Technology Faculty of ForestryIstanbul University Laboratory of Innovative Humano-habitability Research Institute for Sustainable Humanosphere (RISH)Kyoto University

We evaluated fungal decay and mold resistance,leaching, and water absorption of nano-compounds and Paraloid b72-（Pb72） in treated wood specimens to develop new methods of consolidation by combining nanoparticles and consolidants. Scots pine wood specimens were treated with dispersions of nano-Cu O, nano-Zn O,nano-b2O3, nano-Ti O2, and nano-Ce O2. Pb72 treatments of nano-particle-treated wood specimens were then carried out by either vacuum or immersion for 24 h. Previously,decayed wood specimens were also consolidated with the nano-compounds and Pb72. Pb72 treatments reduced element release from treated wood specimens. Nearly all nano-compounds ？ Pb72 treatments increased the biological performance of treated wood specimens against decay fungi tested. Pb72-only treated wood specimens had the highest weight losses in decay tests. No improvements were obtained in mold resistance tests when the nanocompounds and Pb72 were combined. In nano-compoundonly treatments, unleached specimens showed slightly lower water absorption values compared to untreated control specimens. Incorporation of Pb72 into nano-compound-treated wood specimens resulted in considerably lower water absorption and volumetric swell. In previously decayed specimens treated with the nano-compounds and Pb72 solution, water absorption after 2-h immersion declined compared to control specimens.

关键词： leaching declined untreated retention fungi versicolor fungal fungus leached decay

Eth2Vec:Learning contract-wide code representations for vulnerability detection on Ethereum smart contracts

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blockchain(Research and Applications) 2022年第4期3卷 109-122页

作者： nami Ashizawa Naoto Yanai Jason Paul Cruz Shingo Okamura School of Information Science and Technology Osaka UniversityOsaka 565-0871Japan Osaka University Osaka 565-0871Japan National Institute of Technology Nara CollegeNara 639-1080Japan

Ethereum smart contracts are computer programs that are deployed and executed on the Ethereum blockchain to enforce agreements among untrusting *** the most prominent platform that supports smart contracts,Ethereum has been targeted by many attacks and plagued by security ***,many smart contract vulnerabilities have been discovered in the past *** detect and prevent such vulnerabilities,different security analysis tools,including static and dynamic analysis tools,have been created,but their performance decreases drastically when codes to be analyzed are constantly being *** this paper,we propose Eth2Vec,a machine-learning-based static analysis tool that detects smart contract ***2Vec maintains its robustness against code rewrites;i.e.,it can detect vulnerabilities even in rewritten *** machine-learning-based static analysis tools require features,which analysts create manually,as *** contrast,Eth2Vec uses a neural network for language processing to automatically learn the features of vulnerable *** doing so,Eth2Vec can detect vulnerabilities in smart contracts by comparing the similarities between the codes of a target contract and those of the learned *** performed experiments with existing open databases,such as Etherscan,and Eth2Vec was able to outperform a recent model based on support vector machine in terms of well-known metrics,i.e.,precision,recall,and F1-score.

关键词： Ethereum Smart contracts blockchain Neural networks Static analysis Code similarity Vulnerability detection