检索结果-内蒙古大学图书馆

SSrN 2023年

作者： Im, Hyeon-Tae Kim, Woo Jin Kim, Nam-Seok Kim, dae Ha Park, Chang-Soo Park, Kwangsuk Kim, Young do Park, Hyung-Ki Functional Materials and Components R&D Group Korea Institute of Industrial Technology Gangneung25440 Korea Republic of Division of Materials Science and Engineering Hanyang University Seoul04763 Korea Republic of Department of Materials Science and Engineering Hongik University Seoul121-791 Korea Republic of Industrial Materials Processing R&D Department Korea Institute of Industrial Technology Incheon21999 Korea Republic of KONASOL R&D Center KONASOL Dangjin31806 Korea Republic of

Oxide dispersion strengthened (OdS) alloys exhibit excellent mechanical properties due to fine oxide dispersion, but they have great limitations due to utilizing powder fabrication via mechanical alloying. Therefore, this study examined the alloy composition and process that can fabricate OdS titanium (Ti) powder in situ through a gas atomization method. The composition and content of the oxide, which can dissolve in molten Ti during melting and precipitate inside powders during cooling in the gas atomization, were derived through thermodynamic calculations. The OdS Ti alloy composition of Ti + 1 wt% yttria (Y2O3) was derived, and the alloy was prepared as a powder through an electrode induction melting gas atomization (EIGA) method. First, rod-shaped ingots were prepared through vacuum arc remelting (VAr), and Y2O3 was coarsely precipitated along the grain boundaries due to the slow cooling rate. Then, the OdS Ti powder was fabricated by EIGA using the rod ingot and spherical powders could be continuously fabricated. The cross-section microstructure of the powder was observed, and the Y2O3 particles with several tens of nm were uniformly distributed inside the powder. These thermodynamic calculations and experiments confirmed that OdS Ti powder could be fabricated in situ using the gas atomization method. © 2023, The Authors. All rights reserved.

关键词： Powders

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Study on the Application of Typhoon Experience Parameter Analysis in Taiwan’s Offshore Wind Farms

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Water (Switzerland) 2023年第14期15卷 2575页

作者： Fang, Hui-Ming Hsu, Hao-Teng Wang, Hsing-Yu Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung20224 Taiwan Ship and Ocean Industries R&D Center Taipei251401 Taiwan Department of Shipping Technology National Kaohsiung University of Science and Technology Kaohsiung805301 Taiwan

due to the rapid development of computers, researchers have made efforts since the 1990s to develop typhoon forecasting models and stochastic typhoon simulation models to assess typhoon disasters and risks. Typhoon forecasting models are primarily used to predict and track the movement of typhoons and provide warning information to the general public before landfall. Stochastic typhoon simulation models can assess extreme wind speeds and compensate for the limitations of current observations and simulation data length. Taiwan experiences approximately three to four typhoons yearly, of varying intensities and paths. Whether the marine meteorological data includes events of strong typhoon centers passing through will affect the results of frequency analysis. The development of offshore wind power in Taiwan is closely related to the unique marine meteorological conditions throughout the lifecycle stages, including wind farm site selection, feasibility studies, planning and design, construction and installation, operation and maintenance, and decommissioning. This study references relevant research and analyzes sixty-three scenarios using nine types of maximum storm wind speed radii and seven Holland-B parameters. The data from Japan Meteorological Agency Best Track data (JMA BTd) is utilized, explicitly selecting 20 typhoon events after 2000 for wind speed simulation using a typhoon wind speed model. After validating the typhoon wind speeds with observation data from the Central Weather Bureau (CWB) in Hsinchu and the Longdong buoy, the technique of Monte Carlo simulation is utilized to generate synthetic typhoons randomly. The average of the relative absolute errors for the simulated maximum wind speeds is calculated, and through comprehensive evaluation, optimal parameter combinations ((Formula presented.), (Formula presented.)) are obtained. © 2023 by the authors.

关键词： Stochastic systems

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discussion on a new paradigm of endogenous security towards 6G networks

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Frontiers of Information technology & Electronic engineering 2022年第10期23卷 1421-1450页

作者： Xinsheng JI Jiangxing WU Liang JIN Kaizhi HUANG Yajun CHEN Xiaoli SUN Wei YOU Shumin HUO Jing YANG Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China National Digital Switching System Engineering&Technological R&D Center Zhengzhou 450002China Purple Mountain Laboratories:Networking Communications and SecurityNanjing 211111China

The sixth-generation mobile communication(6G)networks will face more complex endogenous security problems,and it is urgent to propose new universal security theories and establish new practice norms to deal with theªunknown unknownºsecurity threats in *** paper first expounds the new paradigm of cyberspace endogenous security and introduces the vision of 6G cyberspace ***,it analyzes the security problems faced by the 6G core network,wireless access network,and emerging associated technologies in detail,as well as the corresponding security technology development status and the integrated development of endogenous security and traditional ***,this paper describes the relevant security theories and technical concepts under the guidance of the new paradigm of endogenous security.

关键词： 6G security New paradigm of endogenous security Core network Wireless access network

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The Effect of V Content on the Phase Formation Behavior in VC Based Tool Steel Fabricated Through Powder Metallurgy

SSRN

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SSrN 2023年

作者： Park, Sung-Min Kim, dae Ha Jun, Tea-Sung Kim, Nam-Seok Park, Chang-Soo Park, Kwangsuk Kim, dong Hoe Park, Hyung-Ki Im, Hyeon-Tae Functional Materials and Components R&D Group Korea Institute of Industrial Technology Gangneung25440 Korea Republic of Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of R&D Center KONASOL Daedeok-Gu Daejeon34302 Korea Republic of Department of Mechanical Engineering Incheon National University Incheon22012 Korea Republic of Industrial Materials Processing R&D Department Korea Institute of Industrial Technology Incheon21999 Korea Republic of

This study investigated changes in the hardness and phase formation behavior following the vanadium (V) content in vanadium carbide (VC)-based tool steel. The V contents in VC-based tool steels were set to 9.0 and 11.5 wt%, and other compositions were the same. The two samples were prepared as powders through vacuum induction inert melting gas atomization and then as bulk samples through hot isostatic pressing. For the heat treatment, the bulk samples were annealed at 1070 °C and then quenched. The hardness of the samples with the V content of 9.0 and 11.5 wt% was 50.7 and 17.3 HrC, respectively, and the 11.5 wt%V sample had a lower hardness value. The phases in the two samples were analyzed to determine the reason for the difference in hardness. From the analyses, the α`-martensite phase was formed in the matrix of the 9.0 wt%V sample, whereas the matrix of the 11.5 wt%V sample was the α-ferrite phase. Thermodynamic calculations and high-temperature phase analysis were performed to examine the changes in the phase formation. In the 9.0 wt%V sample, the γ-austenite phase was formed at high temperature and transformed to the α`-martensite phase during cooling in the heat treatment process. Meanwhile, the 11.5 wt%V sample had no austenite phase at high temperatures, so martensitic transformation did not occur. These analyses confirmed that it is crucial to control the phase formation behavior by controlling the contents of V and C with an appropriate ratio in securing a high hardness in VC-based tool steel. © 2023, The Authors. All rights reserved.

关键词： Tool steel

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Techno-Economic Impact of Incineration-Based Waste to Energy Generation technology in Bangladesh: A Short review and a Case Study

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SSrN 2025年

作者： Hossain, Mohammad Masrur Shahriar, Tanvir Inan, Md. Navid Habib, M. Ahsan Hasanuzzaman, M. Hossain, Mohammad Mehran Department of Mechanical and Production Engineering Islamic University of Technology Board Bazar Gazipur1704 Bangladesh UM Power Energy Dedicated Advanced Center University of Malaya Level 4 Wisma R&D Jalan Pantai Baru Kuala Lumpur59990 Malaysia Department of Chemical Engineering Bangladesh University of Engineering and Technology Dhaka1000 Bangladesh

This study evaluates the feasibility of a municipal solid waste incineration-based power generation system in dhaka, Bangladesh, addressing critical issues of waste management and energy deficits driven by rapid urbanization. A 10 MW waste-to-energy facility operating at 22.5% efficiency was analyzed using key economic metrics, including Net Present Value (NPV), Payback Period, Internal rate of return (Irr), Modified Internal rate of return (MIrr), Levelized Cost of Energy (LCOE), and Levelized Cost of Waste (LCOW). The analysis reveals an NPV of $4.99 million, an Irr exceeding 10%, and a payback period of 11.06 years, indicating economic viability. Additionally, the plant is projected to reduce annual CO2 emissions by 0.045 million tons, contributing to environmental sustainability. The findings demonstrate that waste-to-energy technology offers a viable solution for mitigating urban waste challenges while enhancing energy security, providing a sustainable pathway for dhaka’s development and a model for similar urban context. © 2025, The Authors. All rights reserved.

关键词： Municipal solid waste

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Experimental Study on humidity sensitivity of New dC ionization 13

Experimental Study on humidity sensitivity of New DC ionizat...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： ronggang, Wang Liuliang, He Xiaoe, Wu Suzhou TA&A Ultra Clean Technology Co. Ltd. R&D Center Suzhou China Beijing University of Civil Engineering and Architecture College of Science Beijing China Baoji University of Arts and Sciences School of Computer Science Baoji China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

The offset voltage and decay time performance parameters of ionizer are greatly affected by the humidity in the working environment. In this paper, the design principle of double dC ionizer with feedback regulation system is introduced, and the humidity sensitivity is studied by experiment. By setting different humidity, the offset voltage and decay time performance parameters of this ionizer are tested. The results show that the offset voltage at each point can be controlled within ±3V in the humidity range (20%~70%). Under the conditions of ultra-low humidity (8%~15%) and ultra-high humidity (80%~90%), the performance of this dC ionizer can meet the electrostatic control requirements of electrostatic protection area. When the ambient humidity exceeds 80%, the performance is greatly affected. © 2022 IEEE.

关键词： Ionization

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Synergistic N-doping and Heterointerface engineering in W2C/W Nanoarrays Enable pH-Universal Hydrogen Evolution Catalysis

ACS Applied Engineering Materials

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ACS Applied engineering Materials 2023年第2期1卷 861-867页

作者： Wei Liu Zhuang Zhang Marshet Getaye Sendeku Jiage Yu Tianshui Li Zhaolei Wang Wenqin Gao Hai Liu Yinghao Guo Qihao Sha Yun Kuang Xiaoming Sun State Key Laboratory of Chemical Resource Engineering College of Chemistry Beijing University of Chemical Technology Beijing 100029 China Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in Shenzhen Shenzhen 518057 P. R. China

The electrocatalytic hydrogen evolution reaction (HEr) by nonprecious metal-based cathodes provides a cost-effective way to store renewable energy as hydrogen fuel. However, pH variation on the cat...

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Encapsulation technology of epoxy resin for high temperature operating power modules

Encapsulation technology of epoxy resin for high temperature...

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2021 International Exhibition and Conference for Power Electronics, Intelligent Motion, renewable Energy and Energy Management, PCIM Europe 2021

作者： Kaji, Yusuke Yamada, Koji Harada, Hiroyuki rokubuichi, Hodaka Hanawa, Yutaro Fujino, Junji Takao, Haruo Power Device Works Mitsubishi Electric Corporation Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Japan Component Production Engineering Center Mitsubishi Electric Corporation Japan

ISBN: (纸本)9783800755158

The encapsulation of power modules has functions, such as to protect semiconductors and wiring materials from thermal shock, physical attack, and foreign objects from outside, to ensure insulation. recently power modules are required to be higher current density and operating temperature, therefore encapsulation technologies which materials and process are also required to improve. In this paper, the latest development results of encapsulation technology for higher temperature operating and current density are reported. © VdE VErLAG GMBH · Berlin · Offenbach.

关键词： Epoxy resins

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A crosslinked waterborne poly(vinyl acetate) for greenhouse gas fixation with improved elastomeric properties, shape-memory ability, and recyclability

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Journal of Environmental Chemical engineering 2023年第6期11卷

作者： Chen, Yen-Chuan Huang, Ying-Chi Huang, Yi-Hua Lin, Ying-Feng Huang, Ho-Ching Jeng, ru-Jong Cheng, Yu-Wei Wu, Chien-Hsin Chanda chemical corp. Taipei10345 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei106319 Taiwan Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei106319 Taiwan Biochemical Technology R&D Center Ming Chi University of Technology New Taipei City243303 Taiwan

The development of raw materials from methane and carbon dioxide holds significant potential to cut greenhouse gas (GHG) emissions and reduce the global carbon footprint. As an important monomer, vinyl acetate (VAc) can be produced by the consumption of acetic acid, which will potentially contribute to the reduction of GHGs emission. However, polymers based on VAc are usually prepared from emulsion polymerization in water which brings about the challenges of using modification processes to improve their properties. Here, a newly developed crosslink was able to establish covalently adaptable networks directly in water, enabling the formation of a poly(vinyl acetate) (PVAc) composite. As a result, PVAc emulsions using a monomer of 100% VAc could be transformed from a soft and weak adhesive polymer into an elastomeric polymer composite network with an elongation (775%) at break and flexibility. With the enhanced rubbery modulus, the polymer possesses characteristics for shape-memory material applications with 93% shape fixity and 99% shape recovery after repeated deformation and shape fixity for three times. The recyclability of the PVAc thermosets was demonstrated after granulating and remolding three times, representing an opportunity for designing a greenhouse gas fixing material. © 2023 Elsevier Ltd

关键词： Carbon dioxide

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different doping of biomass-derived carbon dots effect on the degradation efficiency of methylene blue 3

Different doping of biomass-derived carbon dots effect on th...

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3rd International Conference on Optoelectronic Science and Materials, ICOSM 2021

作者： Han, Yu Peng, Yuan Zhang, Hongyan Beijing Key Laboratory of Clothing Materials R&D and Assessment Beijing Engineering Research Center of Textile Nanofiber Beijing Institute of Fashion Technology Beijing100029 China

ISBN: (数字)9781510649323

ISBN: (纸本)9781510649316

Carbon dots (Cds) not only inherit the advantages of good biocompatibility and abundant raw material sources, but also exhibit excellent optical properties. Cds possess important research significance and application prospects in materials science, biomedicine, and catalytic degradation. In this paper, Cds were prepared from dandelions mixed with boric acid, urea, and norfloxacin respectively. We investigated the effect on the degradation efficiency of methylene blue (MB) using boron, nitrogen, and fluorine for co-doping Cds under solar light. results show that nitrogen-doped Cds can improve photocatalytic degradation rate up to 55% which is higher than no doped Cds. That also is the best among boron-doped, fluorine-doped, and co-doping Cds with the two or three elements co-doping. © 2021 SPIE.

关键词： Boric acid

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