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SSRN 2024年

作者： Rosiak, Mariusz Department of Machine Technology and Materials Science Faculty of Mechanical Engineering Opole University of Technology Mikolajczyka str. 5 Opole45-271 Poland

The study presents the results of research on porous compacts subjected to complex loading conditions. The sintered samples were produced under standard powder metallurgy (PM) operating conditions. Plastic deformation of the compacts was carried out under compressive conditions with simultaneous oscillatory torsion. The time-variable parameters during compaction included the torsion angle, torsion angle amplitude, and frequency. The influence of the deformation process conditions on the consolidation of compacts and the evolution of porosity was analysed. Research was conducted to assess changes in density, porosity, and geometry for various deformation variants. Conditions for the most effective densification of porous compacts under free compression with simultaneous oscillatory torsion were identified. © 2024, The Authors. All rights reserved.

关键词： Porosity

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Coherent and Semicoherent α/β Interfaces in Titanium: structure, thermodynamics, migration

arXiv

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arXiv 2023年

作者： Wang, Siqi Wen, Tongqi Han, Jian Srolovitz, David J. Department of Materials Science and Engineering City University of Hong Kong Hong Kong Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong

The α/β interface is central to the microstructure and mechanical properties of titanium alloys. We investigate the structure, thermodynamics and migration of the coherent and semicoherent Ti α/β interfaces as a function of temperature and misfit strain via molecular dynamics (MD) simulations, thermodynamic integration and an accurate, DFT-trained Deep Potential. The structure of an equilibrium semicoherent interface consists of an array of steps, an array of misfit dislocations, and coherent terraces. Analysis determines the dislocation and step (disconnection) array structure and habit plane. The MD simulations show the detailed interface morphology dictated by intersecting disconnection arrays. The steps are shown to facilitate α/β interface migration, while the misfit dislocations lead to interface drag;the drag mechanism is different depending on the direction of interface migration. These results are used to predict the nature of α phase nucleation on cooling through the α-β phase transition. Copyright © 2023, The Authors. All rights reserved.

关键词： Thermodynamics

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Powder Bed Fusion of Soft-Magnetic Iron-Silicon-Based Alloys: Advantages and Challenges

SSRN

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SSRN 2023年

作者： Andreiev, Anatolii Hoyer, Kay-Peter Hengsbach, Florian Haase, Michael Schaper, Mirko Department of Mechanical Engineering Germany Materials Science Paderborn University Warburger Str. 100 Paderborn33098 Germany

Powder bed fusion of metal with laser beam (PBF-LB) of application-ready parts of soft-magnetic iron-silicon alloys with a high silicon content is both a promising as well as challenging task. Although a higher silicon content significantly improves the soft-magnetic behaviour of iron-silicon alloys, it also promotes brittleness and thus, makes these alloys barely suitable for the production of qualitative parts with a height of more than a few millimetres. Therefore, the current study aims to analyse the influence of increasing silicon content on the soft-magnetic and mechanical behaviour of additively processed iron-silicon alloys. In addition, the potential of a build-chamber preheating system implemented in a standard PBF-LB machine is investigated in terms of manufacturing defect- and crack-free large-scale samples and components of brittle iron-silicon alloys. For this purpose, four alloys with varying silicon content between 2.4 wt.-% and 10.0 wt.-% are processed into samples with different dimensions. Subsequently, the additively manufactured samples are heat-treated in different ways and the resulting influence of both, the Si-content and the heat treatment on the microstructure as well as the soft-magnetic and mechanical properties are analysed. As it is shown, almost completely defect- and crack-free parts can be manufactured for all investigated alloys using adapted processing parameters independent of the sample dimensions. Pure iron alloyed with 6.7 wt.-% of Si exhibits the best permeability of all investigated alloys, which can be further improved up to 1.5 times by applying a suitable heat treatment. Thus, the obtained results build a basis for powder bed fusion of metal with laser beam of application-adapted parts with outstanding soft-magnetic properties, which can be barely manufactured using conventional forming technologies. © 2023, The Authors. All rights reserved.

关键词： Laser beams

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Circular Economy in Healthcare Sector: Cloud-based HST with GT to Minimize Healthcare-associated Infections

Circular Economy in Healthcare Sector: Cloud-based HST with ...

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IEEE International Conference on Industrial engineering and engineering Management

作者： Kartika Nur Alfina R.M. Chandima Ratnayake School of Business and Management Institut Teknologi Bandung (ITB) Bandung Indonesia Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Stavanger Norway

ISBN: (数字)9798350386097

ISBN: (纸本)9798350386103

Healthcare-associated infections (HAIs) pose a significant challenge to the quality of care, leading to patient complications, extended hospital stays, and high consumable costs. Cloudbased technologies have become essential for overcoming barriers to circularity in healthcare, offering transformative opportunities for healthcare systems. Measuring the impact of linear consumption is crucial for circularity, however the healthcare industry lacks focus on measuring the impact of HAIs, particularly related to hand hygiene. Integrating cloud-based hand sanitizer and group technology offers potential to prevent the spread of HAIs and minimize linear consumption, aligning with Circular Economy Goals (CEGs). This study examines the potential of integrating cloud-based HST with group technology (GT) to minimize the impact of HAIs caused by poor hand hygiene. Using the Opitz Code classification system, a coding system is created to measure the impact of poor hand hygiene, serving as a control and improvement tool aligned with CEGs. This article presents an illustrative case to demonstrate the HST coding classification to facilitate predictive analysis for HAIs prevention and control. These findings contribute to reducing HAIs by improving hand hygiene performance in healthcare facilities. Furthermore, by aligning technological advances with CEGs, this study offers a proactive strategy to mitigate environmental degradation by reducing carbon dioxide $\left(\mathrm{CO}_{2}\right)$ emissions and strengthening the resilience of healthcare systems.

关键词： Hands Industries Group technology Codes Prevention and mitigation Medical services Encoding Predictive analytics Testing Resilience

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Enhancing mechanical properties of surface hardness and abrasion resistance of Fe-Mn-Al alloy by using atmospheric pressure plasma jet nitriding

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Surface and Coatings Technology 2024年 484卷

作者： Mosisa, Fikiru Tafase Chen, Hua-Wei Kuo, Yu-Lin Guo, Jhao-Yu Mas'ud, Sifa'ul Hsu, Weu-Mau Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan Department of Chemical and Materials Engineering National Ilan University Yilan260 Taiwan Advanced Manufacturing Research Center National Taiwan University of Science and Technology Taipei106335 Taiwan Department of Mechanical and Electro-Mechanical Engineering Tamkang University New Taipei City251301 Taiwan CSBC Power Technology Co. Ltd Zhongzheng Dist. Keelung City202009 Taiwan

This study investigates the use of a N2/H2 mixture gas and an atmospheric pressure plasma jet (APPJ) for nitriding Fe-Mn-Al alloy. Pure metals, iron, manganese, and aluminum, were used as the reference metallic substrates. Various characterization techniques, including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Vickers hardness test, and optical emission spectroscopy (OES), were employed to analyze the material properties and plasma species. XRD analysis revealed the formation of nitride compounds on metals after the nitriding process. The plasma-nitrided Fe-Mn-Al alloy showed the mixture phases of Fe4N and Al, while plasma-nitrided pure metals possessed their specific metal nitrides. After nitriding process, the surface hardness increased to approximately 596 ± 6 HV0.025 for the Fe-Mn-Al alloy, 1307 ± 9 HV0.025 for manganese, 467 ± 4 HV0.025 for aluminum, 646 ± 5 HV0.025 for iron, and, compared to the pristine values of around 346 ± 4 HV0.025, 972 ± 6 HV0.025, 145 ± 3 HV0.025, and 125 ± 3 HV0.025, respectively. After the nitriding process, the Fe-Mn-Al alloy exhibited notable enhancements in both its resistance to abrasion and its capacity to endure impact loads, as indicated by the conducted tests. The OES test results identified NH radicals generated by the atmospheric pressure plasma jet beam as the active chemicals responsible for the success of the nitriding process. Overall, this study provides valuable insights into the strengthening of metal surfaces through nitriding using an N2/H2 mixture gas and APPJ. The results demonstrate significant improvements in surface hardness and surface free energy for iron, manganese, aluminum, and Fe-Mn-Al alloy, highlighting the effectiveness of NH radicals in the nitriding process. © 2024 Elsevier B.V.

关键词： Manganese alloys

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An Assessment of Patent Scoring Using Natural Language programming

An Assessment of Patent Scoring Using Natural Language Progr...

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2022 Portland International Conference on Management of engineering and Technology, PICMET 2022

作者： Khongamnuaisak, Lertchai Pentrakoon, Duanghathai Sinthupinyo, Sukree Suanpong, Kwanrat Chulalongkorn University Technopreneurship and Innovation Management Program Graduate School Bangkok Thailand Chulalongkorn University Faculty of Science Department of Materials Science Bangkok Thailand Faculty of Engineering Chulalongkorn University Department of Computer Engineering Bangkok Thailand Chulalongkorn Business School Commerce Department Bangkok Thailand

ISBN: (数字)9781890843410

ISBN: (纸本)9781890843410

Patent has been an increasingly important role in the world because it is not only significant to protect the invention of the company's business but also to generate revenue from the commercialization. WIPO (2018) reports that the repository has many patents so, to assess patent, it consumes time and requires various expertise. Generally, several models have been developed to address this matter, which to assess using a questionnaire tool for portfolios by human. Perhaps, there is not precise because it is assessed base on personal bias or previous experience of expertise. So that, occurs bias any limitation exists that our research will address by artificial intelligence. Thus, this research applies a Natural Language programming to assess for commercial of the patent. Then, the obtained data is used to assigned factors and calculate the model for assessing the commercialization of patent. This finding should deliver an alternative effective patent assessment, which is tool addresses, some current deficiency patent assessment for commercialization. © 2022 PICMET.

关键词： Patents and inventions

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Desorption Behavior and Thermogravimetric Analysis of Bio-Hardeners

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Journal of Renewable materials 2022年第8期10卷 2015-2027页

作者： Benoit Ndiwe Antonio Pizzi Hubert Chapuis Noel Konai Lionel Karga Pierre Girods Raidandi Danwe Department of Mechanical Engineering Higher Technical Teacher Training College Douala(ENSET)University of DoualaDoualaCameroon Laboratory of Forest Resources and Wood Valorization(Larefob) ENSET of DoualaDoualaCameroon Department of Engineering Science West UniversityTrollhättanSweden LERMAB-ENSTIB University of LorraineEpinal88051France Laboratoire D’Etudes et de Recherche sur le Matériau Bois LERMAB Facultédes Sciences et TechnologiesUniversitéde LorraineNancyFrance Laboratory of Materials Mechanics Structures and Integrated ManufacturingNational Advanced School of EngineeringYaoundé1 UniversityYaoundéCameroon Department of Mechanical Petroleum and Gas Engineering Faculty of Mines and Petroleum IndustriesUniversity of MarouaKaéléCameroon Laboratory of Mechanic Materials and BuildingSahel Institute of Maroua UniversityMarouaCameroon

In this work,the thermal degradation and drying of bio-hardeners are *** bio-hardeners based on exudates of Senegalia senegal,Vachellia nilotica,Vachellia seyal,and Acacia siebteriana were analyzed by FTIR and thermogravimetric analysis,and a desorption study was also *** analysis by infrared spectroscopy indicates the existence of oligomers of different types all giving 5-hydroxy-2-hydroxymethylfuran and 2,5-dihydroxymethylfuran which are then the real hardening *** pyrolysis of these extracts reveals three main regions of mass loss,a first region is located between 25℃and 110℃reflecting the loss of water from the adhesive and the formation of some traces of volatile organic compounds such as CO_(2)and CO,a second zone characterized by the release of CO,CO_(2)and CH4 gases with peaks between 110°and 798.8℃.At the end of the analysis,about 22%of the initial mass remains undecomposed,this mass corresponds to the rigid segments of the bio-hardener which are not completely decomposed.

关键词： Exudates pyrolysis FTIR bio-hardener desorption

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Thermal fatigue crack growth behavior of ZCuAlFeMn alloy strengthened by laser shock processing

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 1023-1030页

作者： Guang-lei LIU Yu-hao CAO Kun YANG Wei GUO Xiao-xuan SUN Ling ZHAO Nai-chao SI Jian-zhong ZHOU School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Mechanical Engineering Jiangsu UniversityZhenjiang 2120013China

The effect of laser shock processing(LSP) on the hardness, surface morphology, residual stress, and thermal fatigue properties of a ZCuAl10Fe3Mn2 alloy was investigated to improve the thermal fatigue performance and decrease the surface crack of high-temperature components. The microstructure and crack morphology were analyzed by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS). The results showed that laser shock could significantly improve the thermal fatigue performance of the alloy at a pulse energy of 4 J. Under the effect of thermal stress and alternating stress, microstructure around the specimen notch was oxidized and became porous, leading to the formation of multiple micro-cracks. The micro-cracks in the vertical direction became the main cracks, which mainly expanded with the conjoining of contiguous voids at the crack tip front. Micro-cracks in other directions grew along the grain boundaries and led to material shedding.

关键词： copper alloy laser shock strengthening surface morphology thermal fatigue properties crack initiation crack propagation

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Constructive and Destructive Effects of Mediatization of Historical Memory 4

Constructive and Destructive Effects of Mediatization of His...

引用

4th International Conference on Technology Enhanced Learning in Higher Education, TELE 2024

作者： Butin, Anton Vladimirovich Kuzenkov, Sergei Evgenievich Tegaeva, Anna Ibragimovna Tselykovskiy, Alexey Andreevich Research Institute Ipetsk State Technical University Lipetsk Russia Institute of Mechanical Engineering and Transport Lipetsk State Technical University Lipetsk Russia Lipetsk State Technical University Department of Philosophy and Social Communication Lipetsk Russia Lipetsk State Technical University Department of Physical Materials Science Lipetsk Russia

ISBN: (纸本)9798350353532

The study analyzes the process of transformation of historical memory under the influence of digitalization. To reveal the specifics of the phenomenon of historical memory in the digital society, the concept of midi-memory is used to describe the mechanisms of storage and translation of collective representations of the past in the conditions of digitalization. The process of digitalization gradually erases the boundary between cultural and communicative memory. In addition, the number of subjects involved in the construction of representations of the past is significantly increasing. As a result, the mechanism of constructing images of the past is changing. These processes lead to the need to analyze the destructive and constructive effects of the mediatization of collective memory. © 2024 IEEE.

关键词： collective memory digitalization historical memory media media memory mediatization

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Sn-O dual-doped Li-argyrodite electrolytes with enhanced electrochemical performance

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Journal of Energy Chemistry 2021年第8期30卷 530-537,I0011页

作者： Ting Chen Dewu Zeng Long Zhang Meng Yang Dawei Song Xinlin Yan Chuang Yu Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of Technology300384 TianjinChina Institute of Solid State Physics Vienna University of TechnologyWiedner Hauptstr.8-101040 ViennaAustria Department of Mechanical and Materials Engineering University of Western Ontario1151 Richmond StN6A 3K7 LondonCanada

As a type of candidate for all-solid-state Li batteries,argyrodite solid electrolytes possess high ionic conductivity,but poor compatibility against Li ***,we report novel Li_(6) PS_(5) I-based argyrodite sulfides with Sn-O dual doping,which is a powerful solution to comprehensively improve the performance of a *** combination of O and Sn-aliovalent doping not only enables an improved ionic conductivity but more importantly realizes an intensively enhanced interfacial compatibility between argyrodite and Li metal and Li dendrite suppression *** assembled battery with Sn-O dual-doped electrolyte and Li anode demonstrates high capacity and decent cycling *** doping is thus believed to be an effective way to develop high performance sulfide solid electrolytes.

关键词： Lithium dendrite suppression Interface Dual doping Argyrodite solid electrolyte All-solid-state lithium-metal battery

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