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SSrN 2023年

作者： Kwon, Yong Min Kim, Chang-Su Kim, Kookhan Kim, Yang-Su Kim, Sung-Su Kim, Jongmin Chemical Materials R&D Department Korea Automotive Technology Institute Cheonan Chungnam31214 Korea Republic of

To overcome the energy density limitations of current layered cathode materials, high-nickel cathode materials with a bimodal distribution composed of ~15um sized secondary particles and micron-sized single crystals were synthesized from a single-sized high-nickel precursor by incorporating the grain-growth promoting/inhibiting additive. Synthesized cathode material effectively reduced the pores within the electrode and showed an excellent electrode density of >3.9 g/cm3, exceeding ~80% of the theoretical density. In addition, due to efficient contact between large secondary particles and small single crystals, bimodal particles with additives showed higher electrical conductivity compared to additive-free monomodal secondary particles, and a capacity of ~220 mAh/g was achieved even at a high loading level of ~30 mg/cm2 and 96% active-material fraction. Based on remarkable electrode density and high capacity, it was possible to realize a volumetric energy density of more than 700 wh/L, which, to the best of our knowledge, is the highest result among electrode energy density made with the layered cathode material. Moreover, through the synergistic effect of morphology control by selective additives and surface coating, the synthesized bimodal cathode simultaneously exhibited excellent capacity as well as improved cycle-life performance compared to a bare cathode without additives. The enhanced electrochemical performance is attributed to increased connectivity between individual cathode particles, decreased bulk/surface resistance, and reduced intergranular cracks after cycling through structure design by additives, which was confirmed through various electrochemical analyses and electrode observations. © 2023, The Authors. All rights reserved.

关键词： Single crystals

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Highly Active and Stable Bimetallic Ordered Catalysts for Oxygen reduction reaction Improvement in Polymer Exchange Membrane Fuel Cells

SSRN

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SSrN 2023年

作者： Kim, Sun-I Lim, Su-Yeong Son, Mingyu Kim, Taehyo Green Materials and Processes R&D Group Korea Institute of Industrial Technology Ulsan44413 Korea Republic of

demand for replacing the Pt catalyst in proton exchange membrane fuel cells (PEMFCs) has increased because Pt metal is rare and high cost. The most reasonable way is synthesizing Pt-base alloy using transition metals such as Co, Ni, Fe, and Mo. The Pt-based alloy catalysts exhibit excellent catalytic activity by creating a synergistic effect through the interaction between Pt and the transition metals. Here we present the best PtNi alloy composition and maximize the performance of the oxygen reduction reaction (Orr) activity in fuel cells by annealing the alloy under a hydrogen atmosphere. The Pt7Ni3/C catalyst indicated a higher Orr activity than other compositions due to different structural changes, and the annealing catalysts at 700°C under an H2 atmosphere improved the electrochemical activity and stability. The heat treatment increased the conductivity by reducing oxygen bonding as well as changing the structure into an ordered face-centered tetragonal (FCT) structure with good activity. The result of these studies provides a new way to develop high-performance and low-cost catalyst materials for fuel cells. © 2023, The Authors. All rights reserved.

关键词： Heat treatment

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Synthesis and Performance of an Associative Anti-shear drag reducer Based on Hydrogen Bond Association of dodecyl Methacrylate

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China Petroleum Processing & Petrochemical technology 2023年第1期25卷 23-33页

作者： Lu Yong Li Chenhao Li Hao Chen Yue Xu dan Wang Yiran Meng Yeqiao Zhang Xiaolai School of Chemistry and Chemical Engineering Shandong UniversityJinan 250061China PipeChina Eastern China Crude Oil Storage and Transportation Co. Ltd.Science and Technology R&D CenterXuzhou 221008China Shandong Dongyue Polymer Material Co. Ltd.Zibo 256401China State Key Lab of Fluorinated Functional Membrane Materials Zibo 256401China

Using K2S2O8-Na2SO3 as the redox initiation system,a hydrogen-bond-association-based dodecyl methacrylate system associative anti-shear drag reducer was synthesised by standard emulsion *** reaction process was simple and gentle as well as safe and *** design was carried out using molecular dynamics simulation *** results of infrared spectroscopy,thermogravimetric analysis,differential scanning calorimetry,gel chromatography,and laser light scattering showed that the reaction polymerisation was relatively complete,the product was uniform,the molecular weight distribution was controllable,and the synthesised polymer had good *** donor lauryl methacrylate-styrene-methacrylic acid(LMA-St-MAA)and acceptor lauryl methacrylate-styrene-dimethylaminoethyl methacrylate(LMA-St-dMA)polymers had an associative intermolecular interaction force,which increased the molecular cluster size of the associative system *** complex had good shear resistance,and the test results of the tube pump shear test showed that the synthesised associative oil-soluble polymer drag reduction system exhibited better drag reduction rate performance than poly-α-olefins over repeated *** research results provide a reference plan for minimising the number of station-to-station inputs,thereby ensuring the stability of oil pipelines and reducing transportation costs.

关键词： drag reducer associative effect drag reduction rate shear resistance

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Hox-determined appendage regeneration restores cockroach courtship rituals

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Science China(Life Sciences) 2025年第3期68卷 874-876页

作者： Xingmei Mai Mingtao Liao Fangming Zhao Ethan Yihao Li Fangzheng Liu renaguli Aisa Sichen Wu Nan Chen Sheng Li Chonghua ren Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Guangzhou Key Laboratory of Insect Development Regulation and Application ResearchInstitute of Insect Science and TechnologySchool of Life SciencesSouth China Normal UniversityGuangzhou 510631China Guangmeiyuan R&D Center Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied TechnologySouth China Normal UniversityMeizhou 514779China High School Affiliated to South China Normal University Guangzhou 510631China Xinyang Aviation Vocational College Xinyang 464006China

dear Editor,The German cockroach,Blattella germanica(Insecta,Blattodea),is one of the most synanthropic cosmopolitan pests affecting public health,which is often described as“little mighty”because of its extreme vitality and *** characterization in cockroaches is primarily due to two crucial biological traits,strong regenerative capacity and excellent fecundity(ren et al.,2023),but nothing is known about the underlying relationship between these two traits in terms of physiology and *** have evolved diverse appendages(***,labial palp,maxillary palp,leg,wing,and cercus)that are used for locomotion,feeding,communication,and other vital functions(Chen et al.,2022;Li et al.,2024).As a crucial adaptive strategy,appendage regeneration enables animals to restore injured body parts and their associated functions(Tanaka,2016),significantly enhancing survival ability and ecological adaptation(Zhong et al.,2023).Moreover,cockroaches exhibit extremely prominent capacity of leg regeneration in the insect kingdom(Li et al.,2018;ren et al.,2024;Zhang et al.,2024).

关键词： traits antenna regeneration

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Improving Customer Experience Using a Hybrid decision Tree and Support Vector Machine Approach 1

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7th International Conference on Intelligent Computing and Optimization, ICO 2023

作者： ravisankar, A. Kumaraperumal, S. Karthikeyan, M. Chohan, Jasgurpreet Singh Kalita, Kanak Department of Management Studies Erode Sengunthar Engineering College Erode India CVV Institute of Science and Technology Chinmaya Vishwa Vidyapeeth Onakoor Kerala Emakulam India Department of Business Administration Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Avadi 600062 India Department of Mechanical Engineering University Centre for Research & Development Chandigarh University Mohali140413 India Department of Mechanical Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Avadi600062 India Jadara University Research Center Jadara University Irbid Jordan

ISBN: (数字)9783031508875

ISBN: (纸本)9783031508868

In the competitive telecommunications sector, enhancing customer experience (CE) is crucial for business success. The Net Promoter Score (NPS) is a key indicator of customer loyalty and satisfaction. To boost CE, operators monitor Quality of Experience (QoE) metrics, such as call drop rates, successful installation rates, and data transmission speeds, to identify and address service shortcomings. However, analyzing the primary drivers of NPS remains challenging. This study introduces a hybrid approach combining decision trees (dT) and support vector machines (SVM) to advance CE in telecommunications. This method utilizes SVM for predictive modeling of CE and dT to determine the significant factors affecting it. Customer satisfaction data from a telecommunications provider validates the proposed hybrid model's effectiveness. results demonstrate the model's ability to accurately predict CE and identify essential influencing factors, offering practical implications for companies aiming to enhance customer satisfaction and overall CE. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Sales

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Observation of Femtosecond Laser-induced Columnar Structures above the Surface Level of Al

Observation of Femtosecond Laser-induced Columnar Structures...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Tae Hoon Park Hyo Soo Lee Hai Joong Lee Jee Seong Kim Won Pyo Hong Taek Yong Hwang Industrial Materials Processing R&D Department Korea Institute of Industrial Technology Incheon South Korea Department of Materials Science and Engineering Inha University Incheon South Korea R&D Department DAEHAN OK STEEL Gwangju South Korea Molding and Metal Forming R&D Department Korea Institute of Industrial Technology Bucheon South Korea

Through femtosecond laser irradiation, we observed the formation of columnar structures above the surface level of Al and showed the control of their morphological profiles with the laser fluence and the number of irr... 详细信息

ISBN: (纸本)9781957171258

关键词： Confocal laser scanning microscopy Femtosecond lasers Laser beams Laser irradiation Laser materials processing Scanning electron microscopy

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High-voltage converter with 2 kV SiC MOSFETs for electric fast charging stations

High-voltage converter with 2 kV SiC MOSFETs for electric fa...

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2024 Energy Conversion Congress and Expo Europe, ECCE Europe 2024

作者： derix, david Blaum, Christian Kruschel, Wolfram Heer, daniel Hensel, Andreas Pfeiffer, Jonas Mier, Ainhoa Puyadena Mena Carrillo, Juan Thoma, Jurgen drexler, Christoph Schmidhuber, Michael Friedrichs, Peter Power Electronics and Grid Integration Fraunhofer Institute for Solar Energy Systems Freiburg Germany Advance R&d Sumida Components & Modules GmbH Germany Power Module Development Infineon Technologies Ag Warstein Germany Technical Marketing Infineon Technologies Ag Warstein Germany Business Excellence Infineon Technologies Ag Munich Germany Technology Development Infineon Technologies Ag Erlangen Germany

ISBN: (纸本)9798350364446

In this project, the power electronic system technology for future high-performance charging systems along highways or large inner-city electric charging stations with several MVA system sizes with reduced material demand is presented. The concept is based on a dC bus with 1.5 kV and corresponding high efficient power electronics to connect the vehicles to the dC grid. This approach leads to a cost-efficient system. Key components are an electrically isolated dC converter based on 2 kV SiC power modules and an inductive transformer with switching frequencies up to 50 kHz and an output power of 175 kW. © 2024 IEEE.

关键词： Fast charging (Batteries)

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Novel high-gain InGaN/GaN visible-light photodetectors using polarization self-depletion and quasi-superlattices-induced photoconductive gain

Novel high-gain InGaN/GaN visible-light photodetectors using...

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2024 International Conference on Optoelectronic Information and Functional materials, OIFM 2024

作者： Xu, Haoming Lv, Zesheng Jiang, Hao School of Electronics and Information Technology Sun Yat-sen University Guangdong Guangzhou510006 China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University Guangdong Guangzhou510006 China Guangdong Engineering technology R&D Center of Compound Semiconductors and Devices Sun Yat-sen University Guangdong Guangzhou510006 China

ISBN: (纸本)9781510680517

We proposed and fabricated an InGaN/GaN visible-light heterojunction photodetector with ultrahigh gain based on polarization self-depletion and quasi-superlattices (QSLs) induced photoconductive gain. In the detector, the polarization induced electric field is used to deplete the InGaN/GaN QSL absorber, serving as an internal photogate. On the other hand, the QSLs with the specific quantum barrier width can localize the photogenerated holes, thereby generating additional photoconductive gain. Benefitted from these two effects, the peak optical gain and responsivity of the photodetector reach 5.8×104 and 1.9×104 A/W respectively, under 5 V bias and 402 nm illumination. Meanwhile, the photodetectors indicate excellent weak-light detection capability, as well as a remarkable wavelength selectivity with 402 nm/500 nm rejection ratio surpassing 1×104 © 2024 SPIE.

关键词： Photons

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development of high contrast EUV photoresist for narrow pitch C/H patterning 41

Development of high contrast EUV photoresist for narrow pitc...

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Advances in Patterning materials and Processes XLI 2024

作者： Moon, Yonghoon do, Sungan Kim, Hana Kwon, Seungchul Park, Hoyoon Kang, Cheol Lee, Jae-Jun Ahn, Chanjae Androsov, dmitry Kim, Minsang Hong, Suk-Koo Material Development Team Semiconductor R&d Center Samsung Electronics Samsungjeonjaro 1-1 Gyeonggi-do Hwaseong-si Korea Republic of Material Research Center Samsung Advanced Institute of Technology Samsung Electronics Samsung-ro 130 Yeongtong-gu Gyeonggi-do Suwon-si Korea Republic of

ISBN: (纸本)9781510672208

The organic non-chemically amplified resist (non-CAr) materials have been developed for fine pitch contact hole patterning process to remove the acid blur of conventional chemically amplified resist (CAr) system, but non-CAr materials usually show lower contrast and sensitivity compared to conventional CAr materials, so additional improvements are needed for practical application. In this study, we developed new platforms of EUV PTd resist materials to overcome these limitations and enable fine pitch C/H patterning. The main target of our study is to reduce acid blur and to maintain chemical contrast compared to conventional CAr system by 1) finding better EUV-active structures, or 2) simultaneously generating polarity switching and molecular weight (M.W.) change, or 3) maximizing the M.W. change through the depolymerization. Those new resist materials have confirmed showing equivalent or higher contrast compared to conventional CAr, and also having good resolution in EUV C/H patterning evaluation. © COPYrIGHT SPIE. downloading of the abstract is permitted for personal use only.

关键词： Photoresists

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Surface Ligand Evolution:Sulfur-directed Covalent Bonding of PPh_(3) on Pd_(4)S with Improved Semi-hydrogenation of Terminal Alkynes

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Precision Chemistry 2024年第5期2卷 200-207页

作者： Wentong Jing Shiguang Mo Weijie Zhang Wenting Zhou Kunlong Liu Jie Wei ruixuan Qin Nanfeng Zheng New Cornerstone Science Laboratory State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy Materialsand National&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China China Resources Cement Technology R&D(Guangxi)Co Ltd. Nanning 530008China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China

Surface modification of metallic nanocatalysts with organic ligands has emerged as an effective strategy to enhance catalytic selectivity,although offten at the expense of catalytic *** this study,we demonstrate a compelling approach by surface modifying Pd2S nanocrystals with PPhz ligands,resulting in a catalyst with excellent catalytic activity and durable selectivity for the semi-hydrogenation of terminal *** and theoretical investigations reveal that the presence of S sites on the Pd surface directs PPh_(3) ligands to preferentially form covalent bonds with S,creating distinctive surface S=PPh_(3) *** configuration induces a partial positive charge on Pd,facilitating hydrogen transfer and thus promoting catalytic ***,the covalent bond between the ligand and catalyst surface forms a robust network,ensuring ligand stability and increasing the hydrogenation energy barrier of ***,the Pd_(4)S@PPhz catalyst exhibits an improved catalytic selectivity with durability in terminal alkyne *** study introduces an effective strategy for designing selective hydrogenation catalysts with an enhanced performance.

关键词： Pd nanocatalysts surface modification selective hydrogenation catalytic stability alkyne semi-hydrogenation

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