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Nitrogen Configuration Effects on Charge Carrier dynamics in CsPbBr3/Carbon dots S-Scheme Heterojunction for Photocatalytic CO2 reduction

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Journal of Physical Chemistry Letters 2024年第21期15卷 5728-5737页

作者： Tsai, Kai-An Chang, Yao-Jen Li, Yu-Chieh Zheng, Meng-Wei Chang, Jui-Cheng Liu, Shou-Heng Tseng, Shih-Wen Li, Yan Pu, Ying-Chih Department of Materials Science National University of Tainan Tainan70005 Taiwan Department of Environmental Engineering National Cheng Kung University Tainan70101 Taiwan Department of Chemical Engineering and R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan320314 Taiwan Core Facility Center of National Cheng Kung University Tainan70101 Taiwan School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China

Nitrogen-doped carbon dots (NCds) featuring primary pyrrolic N and pyridinic N dominated configurations were prepared using hydrothermal (H-NCds) and microwave (M-NCds) methods, respectively. These H-NCds and M-NCds were subsequently applied to decorate CsPbBr3 nanocrystals (CPB NCs) individually, using a ligand-assisted reprecipitation process. Both CPB/M-NCds and CPB/H-NCds nanoheterostructures (NHSs) exhibited S-scheme charge transfer behavior, which enhanced their performance in photocatalytic CO2 reduction and selectivity of CO2-to-CH4 conversion, compared to pristine CPB NCs. The presence of pyrrolic N configuration at the heterojunction of CPB/H-NCds facilitated efficient S-scheme charge transfer, leading to a remarkable 43-fold increase in photoactivity. In contrast, CPB/M-NCds showed only a modest 3-fold enhancement in photoactivity, which was attributed to electron trapping by pyridinic N at the heterojunction. The study offers crucial insights into charge carrier dynamics within perovskite/carbon NHSs at the molecular level to advance the understanding of solar fuel generation. © 2024 American Chemical Society.

关键词： Heterojunctions

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Homogenization on solution treatment and its effects on the precipitation-hardening of selective laser melted 17-4PH stainless steel

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Journal of materials Science & technology 2023年第35期166卷 47-57页

作者： Sohee An du-rim Eo Il Sohn Kyunsuk Choi Department of Materials Science and Engineering Yonsei UniversitySeoul03722Republic of Korea Advanced Joining&Additive Manufacturing R&D Department Korea Institute of Industrial Technology(KITECH)529 Seohaean-roSiheung 15014Republic of Korea Department of Industry-University Convergence Hanbat National UniversityYuseongDaejeon34158Republic of Korea

17-4 precipitation-hardened(PH)stainless steel(SS)exhibits high strength and good corrosion resistance via Cu-precipitation *** conventional wrought 17-4PH SS,Cu segregation andε-Cu pre-cipitates are observed in additively manufactured(AM)17-4PH SS owing to the repeated rapid cooling after heating,which characterizes the AM *** this study,solution treatment was conducted under various temperatures(1,000,1,050,1,100,and 1,200℃)and durations(1,2,4,and 8 h)to minimize the negative effects of Cu segregation andε-Cu precipitates on precipitation *** mechanical prop-erties and microstructures of each condition for the Cu precipitation behavior were *** theε-Cu precipitates did not disappear after solution treatment,the average diameter of theε-Cu precipi-tates tended to decrease with increasing solution treatment temperature and ***,solution treatment at a temperature of 1,200℃ for 8 h was the best,resulting in improved strength compared to the conventional solution treatment at 1,050℃.Solution treatment on at least 1,100℃ is effective in AM.

关键词： Selective laser melting Cu segregation Solution treatment 17-4 Precipitation-hardened stainless steel Additive manufacturing

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density functional theory study on the role of ternary alloying elements in TiFe-based hydrogen storage alloys

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Journal of materials Science & technology 2021年第33期92卷 148-158页

作者： Won-Seok Ko Ki Beom Park Hyung-Ki Park School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea Functional Materials and Components R&D Group Korea Institute of Industrial TechnologyGangneung 25440Republic of Korea

The role of additional ternary alloying elements on the performance of stationary TiFe-based hydrogen storage alloys was investigated based on first-principles density functional theory *** a basic step for examinations,the site preference of each alloying element in the stoichiometric and nonstoichiometric B2TiFe compounds was clarified considering possible antisite *** on the revealed site preference,the effect of various possible ternary elements on the hydrogen storage was examined by focusing on the formation enthalpies of TiFeH and TiFeH_(2) hydrides,which were closely related to the change in the location of plateaus in the pressure-composition-temperature *** physical properties such as the volume expansion due to hydride formation were also examined to provide additional criteria for selecting optimum alloying conditions in future alloying design *** alloying elements that maximize the grain boundary embrittlement due to the solute segregation were proposed for the enhanced initial activation of TiFe-based hydrogen storage alloys.

关键词： Hydrogen storage alloy Titanium-iron density functional theory calculation Metallic hydride

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EMI Noise Analysis Using Frequency domain Simulation Considering dynamic Semiconductor Characteristics in Flyback Converter Circuits

EMI Noise Analysis Using Frequency Domain Simulation Conside...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Taiki Kai Tatsuki Kashihara Koji Kobayashi R&D Center Electronic Technology Development Unit Sanden Corporation Isesaki-City Japan

ISBN: (数字)9784885523472

ISBN: (纸本)9798350349498

We propose a hybrid analysis method that uses a general SPICE simulator to perform high-speed and high-precision conduction noise analysis of flyback converter circuits. Time domain analysis, generally used for conducted noise analyses, is disadvantaged by its long analysis time. Frequency domain analysis, which requires a shorter analysis time, is also used for conducted noise analyses, but it struggles to reproduce the operating characteristics of semiconductors. The hybrid analysis method enables frequency domain analysis that considers semiconductor operating characteristics by using the results of a time domain analysis as a noise source. The results of our proposed hybrid analysis method matched the results of a time domain analysis across the entire analyzed bandwidth, from $1-100 \mathrm{MHz}$. The analysis time was about $1/10$ of that of the time domain analysis.

关键词： Buck converters Frequency-domain analysis Noise Circuits Layout Electromagnetic interference Electromagnetic compatibility

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Predicting Seal Longevity: Advanced Simulations for Plasma and rotary Applications in Semiconductor Processes : EO: Equipment Optimization

Predicting Seal Longevity: Advanced Simulations for Plasma a...

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IEEE/SEMI Conference and Workshop on Advanced Semiconductor Manufacturing

作者： Jean Paillard Thomas dunn Feyzan durn Alan Astbury Murat Gulcur Simulation Methods Dev. R&D Trelleborg Sealing Solutions Stuttgart Germany Materials Development R&D Trelleborg Sealing Solutions UK Simulation Methods Dev. R&D Trelleborg Sealing Solutions Ft. Wayne IN USA Global Technical Director R&D Trelleborg Sealing Solutions UK

ISBN: (数字)9798331531850

ISBN: (纸本)9798331531867

In many semiconductor manufacturing processes, ensuring vacuum integrity is critical to achieving optimal tool performance. Elastomers, particularly perfluoroelastomers (FFKMs), are widely employed in both static and dynamic sealing applications within high-end semiconductor equipment due to their resilience in harsh operating conditions such as chemical plasma. However, designing and optimizing each component of semiconductor equipment can be time-intensive, particularly when determining effective preventive maintenance (PM) cycles. The present contribution describes a finite element method to predict seal lifetime in two separate systems where material loss is a primary failure mode; abrasive wear of a rotary seal in a vacuum pump, and a static FFKM seal in a plasma etching application.

关键词： Vacuum systems Seals Elastomers Semiconductor device manufacture Predictive models Etching Plasmas Semiconductor process modeling rubber resilience

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Iron loss calculation model considering stress influence in amorphous alloy core 18

Iron loss calculation model considering stress influence in ...

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18th IEEE Conference on Industrial Electronics and Applications, ICIEA 2023

作者： Zhao, Pengfei Qiu, Shuheng Yang, Xinyu Wang, Haifeng Huo, Lishan Zhao, Zhixiao Zhang, Chi University of Science and Technology of China School of Rare Earths Ganzhou China Chinese Academy of Sciences Ningbo Institute of Materials Technology and Engineering Ningbo China Ningbo Zhongke B Plus New Materials Technology Co. Ltd. R&d Department Ningbo China

ISBN: (纸本)9798350312201

The loss of amorphous motors is lower than that of traditional silicon steel motors, which has broad prospects. However, the interference fit stress of the core and casing can degrade the amorphous properties. This situation reduces the calculation accuracy of the traditional iron loss calculation model. In this paper, the coefficient of the iron loss model under stress is corrected, and an iron loss model considering the influence of interference force is proposed. The iron loss-stress mapping model is obtained by designing the experiment of aluminum ring and core shaft hole matching. The model has acceptable accuracy in the stress range from 0 MPa to 31.927 MPa, and the average calculation error is 8.6% by comparing the calculated value of the model with the measured value. © 2023 IEEE.

关键词： Amorphous alloys

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Accelerating deep Neural Networks with a Low-Cost Lossless Compression

Accelerating Deep Neural Networks with a Low-Cost Lossless C...

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2025 International Conference on Electronics, Information, and Communication, ICEIC 2025

作者： Kim, Seongwook Byeon, Gwangeun Lee, Seungeui Bae, Youngseok Hong, Seokin Sungkyunkwan University Department of Electrical and Computer Engineering Suwon Korea Republic of Advanced R&D Center Hanwha Systems Co. Ltd. Korea Republic of Agency for Defense Development Emerging Science and Technology Directorate Korea Republic of

ISBN: (纸本)9798331510756

Since deep learning inference involves a significant amount of computations, there have been a lot of efforts to accelerate the inference process by eliminating ineffectual compu-tations. As a solution to this problem, several sparsity-aware deep learning accelerators have been proposed. These accelerators perform the inference on compressed data (filters and feature maps) and dynamically remove the ineffectual multiplications with zero operands. For efficiently handling the compressed data on the accelerators, a simple and effective compression scheme, which encodes the whole data with its nonzero values and their positions, is necessary. However, prior approaches have several shortcomings, such as low compression efficiency and high complexity in compression and decompression hardware. This paper proposes a low-cost compression scheme that can be applied to sparsity-aware deep-learning accelerators. The compression scheme synergistically combines two low-cost compression schemes: Zero-Value Compression (ZVC) and Base-delta-Immediate Compression (BdI). Our experimental evaluation shows that the proposed compression scheme achieves an average compression ratio of 2.26, resulting in 2.33x performance improvement, © 2025 IEEE.

关键词： data handling

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Preparation of Temperature-Sensitive Hollow Fiber Membrane and Its detection as a Cell Carrier 29th

Preparation of Temperature-Sensitive Hollow Fiber Membrane a...

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29th International Conference on Computational and Experimental Engineering and Sciences, ICCES 2023

作者： Wang, Hao Sun, Yiyi Wang, Jingwen Yuan, Yuhuang Cheng, Yuen Yee Li, Xiangqin Song, Kedong State Key Laboratory of Fine Chemicals Dalian R&D Center for Stem Cell and Tissue Engineering Dalian University of Technology Dalian116024 China Faculty of Science Institute for Biomedical Materials and Devices University of Technology Sydney SydneyNSW2007 Australia

ISBN: (纸本)9783031449468

NIPAAm has been widely used in cell culture and non-destructive desorption in recent years because it can change its surface configuration by changing temperature. In this study, NIPAAm was grafted onto the surface of the HFMs with cerium ammonium nitrate (CAN) as the initiator to prepare the thermosensitive HFMs. This material was used as a cell carrier for temperature sensitivity and biocompatibility assays to achieve non-destructive harvesting of cells from the surface of the HFMs. The morphology showed that poly (n-isopropylacrylamide) (PNIPAAm) was successfully grafted onto the HFMs. The results of water contact angle at different temperatures showed that the prepared samples have good temperature sensitivity. At 37 °C, PC12 cells adhered to and diffused well on the surface of PNIPAAm-g-HFMs. After cooling to 20 °C, the cells fell off the surface of the membrane in sheet form and retain more extracellular matrix proteins. PNIPAAm-g-HFMs in this study have good biocompatibility and can be better used as cell carriers in cell culture in vitro. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Cells

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reversible sulfur dioxide capture by amino acids containing a single amino group at low sulfur dioxide concentrations

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Environmental Science and Pollution research 2023年第18期30卷 52013-52025页

作者： Kim, Kwanghwi Lim, Hyunji Park, Hyun Sic Kang, Jo Hong Park, Jinwon Song, Hojun Green Materials & Processes R&D Group Korea Institute of Industrial Technology 55 Jongga-Ro Jung-Gu Ulsan44413 Korea Republic of Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-Ro Seodaemun-Gu Seoul03722 Korea Republic of

SO2, an air pollutant, is harmful to human health and causes air pollution;therefore, numerous studies have focused on the development of SO2 control technologies. Although limestone- and ammonia-based absorbents have been widely used in wet desulfurization, they are difficult to regenerate and do not enable the recycling of SO2, which is a useful resource. recently, amino acids have attracted attention as reversible SO2 absorbents because they are eco-friendly and have excellent reactivity with SO2, as well as high regeneration performance. Glycine, L-alanine, β-alanine, 4-aminobutyric acid, 5-aminovaleric acid, and 6-aminohexanoic acid were analyzed to investigate the relationship between SO2 absorption and the amino acid molecular structure using the simulated actual flue gas (200 ppmv SO2 + 13% CO2 in N2 balance). The SO2 absorption of amino acids (with the molecular structure of glycine and alkyl chains of various lengths) improved as the alkyl chain length increased, possibly owing to a decrease in the inductive effect in the molecular structure of the amino acid. Furthermore, 13C-nuclear magnetic resonance spectroscopy was conducted to analyze the SO2 absorption reaction mechanism (including the possible generation of irreversible species), and experiments involving a number of consecutive absorption–desorption cycles were used to confirm the reusability of the amino acids. The tested amino acids exhibited higher cyclic capacities compared to those of deep eutectic solvents and ionic liquids reported in the literature, thereby exhibiting excellent potential as SO2 absorbents. Thus, this study can guide the future design and development of eco-friendly SO2 absorbents. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Sulfur dioxide

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In-situ observation of microcrack initiation and damage nucleation modes on the HAZ of laser-welded dP1180 joint

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Journal of materials Science & technology 2023年第17期148卷 138-149页

作者： Junliang Xue Wei Guo Jin Yang Mingsheng Xia Guang Zhao Caiwang Tan Zhandong Wan Jiaxuan Chi Hongqiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China School of Materials Engineering Shanghai University of Engineering ScienceShanghai201620China R&D Center TANGSTEEL CompanyHBIS GroupTangshan063016China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai264209China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China School of Materials Science and Engineering Beihang UniversityBeijing100191China

In-situ SEM can intuitively observe the changes in microstructure and microcrack initiation during the deformation process of the *** this paper,the microstructural evolution,mechanical properties,and damage nucleation modes of dP1180 laser welded joints were systematically discussed by the trans-mission electron microscope(TEM),focused ion beam(FIB),and in-situ tensile *** precipitation of carbides and disappearance of dislocations tangles deteriorated the mechanical properties of tempered martensite in the sub-critical heat affected zone(SCHAZ),which caused its microhardness slightly de-creased(∼27 HV)and also called the softened *** joints fractured in the SCHAZ during the tensile and Erichsen cupping tests and microcracks initiated from the tempered martensite,while the microc-rack initiation of base material(BM)occurred at the ferrite/martensite *** dominant damage nucleation mode of the joint was tempered martensite cracking,and that of BM was ferrite/martensite interface decohesion during tests.

关键词： In-situ tensile test dP steel Laser welded damage nucleation modes

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