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29th Opto-Electronics and Communications Conference, OECC 2024

作者： Saito, Hiroyuki Nakahira, Yoshihiro Kashima, Masayuki Sarashina, Masahiro Technology Division Oki Electric Industry Co. Ltd Research & Development Center Photonics R&d Department Saitama Warabi-shi Japan

Both increasing network capacity and low power consumption are required for 6G mobile networks. We propose a dynamic area integration method at the user side to reduce the power consumption. Using proposed method, 28.... 详细信息

ISBN: (纸本)9798350308396

关键词： Low power electronics

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Improved surface hydrophobicity of self-assembled transport layers enables perovskite/silicon tandem solar cells with efficiency approaching 31%

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Journal of Energy Chemistry 2025年第5期104卷 749-755页

作者： Jing Yang Jin Wang Biao Shi Yixin dong dongxue Liu Shenhzhi Xu Qian Huang Xiaona du Fu Zhang Miao Yang Yongcai He Bo He Xiaoning ru Shengzhong Liu Xixiang Xu Pengyang Wang Ying Zhao Xiaodan Zhang Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterState Key Laboratory of Photovoltaic Materials and CellsNankai UniversityTianjin 300350China Three Gorges Corporation Science and Technology Research InstituteBeijing 101199China Tianjin Key Laboratory of Efficient Utilization of Solar Energy Tianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Tianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina LONGi Central R&D Institute LONGi Green Energy Technology Co.Ltd.Xi’an 710018ShaanxiChina

[4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid(Me-4PACz)self-assembled monolayer(SAM)as the hole transport materials have been demonstrated remarkable potential in perovskite solar cells(PSCs).However,the hydrophobicity of Me-4PACz presents a critical challenge for the fabrication of high-quality perovskite films due to its poor ***,a doped Al_(2)O_(3)with Me-4PACz to modify the Me-4PACz surface was *** one hand,this approach improved the wettability of the Me-4PACz film,enhancing the coverage,uniformity,and buried interface properties of the perovskite *** the other hand,compared to Al_(2)O_(3)modification alone,doping Al_(2)O_(3)with Me-4PACz allowed direct contact between the perovskite and Me-4PACz,resulting in better buried interface *** a result,we achieved an efficiency of 22.71%for single-junction wide-bandgap perovskite solar cells(1.68 eV).Additionally,the efficiency of perovskite/silicon tandem solar cells was improved from 28.68%to 30.92%,with a significant reduction in ***,the tandem cells demonstrated no degradation after 4200 s of operation at the maximum power point.

关键词： Me-4PACz Tandem solar cell Perovskite/silicon Hydrophic

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Effect of Ni content on the weldability of middle-chromium hyperpure ferritic stainless steels 00Cr21Ti

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Baosteel Technical research 2024年第2期18卷 19-26页

作者： ZHANG Xinbao WANG Zhibin SUN Mingshan YAN Zhifeng WANG Wenxian R&D Center for Stainless Steel Research InstituteChina Baowu Steel Group CorporationTaiyuan 030003China School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Excellent weldability substantially contributes to the intrinsic quality of steels,while appropriate chemical composition plays a primary role in the essential weldability of *** poor weldability of ferritic stainless steels could be improved through modification with minor alloy elements while minimally increasing the ***,studying the effect of minor alloy elements on the weldability of steels is of considerable *** this study,several steels of middle-chromium hyperpure ferritic stainless 00Cr21Ti with different Ni content(0.3%,0.5%,0.8%,and 1.0%)were developed,and their weldabilities of butt joint samples welded using the metal inert gas welding process,including the influence of welded joints on the microstructure,tensile performance,corrosion resistance,and fatigue property,were *** show that the steels with w(Ni)≥0.8%exhibit excellent mechanical properties compared with those with low-Ni content steels,further,their impact toughness at normal atmospheric temperature meets the industrial application standard and the fatigue property is similar to that of 304 austenitic stainless ***,results show that the corrosion resistance of all the samples is almost at the same *** results acquired in this study are supposed to be useful for the optimization of the chemical composition of stainless steels aiming to improve weldability.

关键词： 00Cr21Ti ferritic stainless steel SUS443 welded joint mechanical properties fatigue property Ni content

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Fabrication of a Hydrophobic Hierarchical Surface on Shale Using Modified Nano-SiO_(2)for Strengthening the Wellbore Wall in drilling Engineering

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Engineering 2022年第4期8卷 101-110页

作者： Xianbin Huang Jinsheng Sun He Li ren Wang Kaihe Lv Haichao Li Key Laboratory of Unconventional Oil and Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao 266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China CNPC Engineering Technology R&D Co. Ltd.Beijing 102206China

Wellbore stability is essential for safe and efficient drilling during oil and gas exploration and *** paper introduces a hydrophobic nano-silica(HNS)for use in strengthening the wellbore wall when using a water-based drilling fluid(WBF).The wellbore-strengthening performance was studied using the linear swelling test,hot-rolling recovery test,and compressive strength *** mechanism of strengthening the wellbore wall was studied by means of experiments on the zeta potential,particle size,contact angle,and surface tension,and with the use of a scanning electron microscope(SEM).The surface free energy changes of the shale before and after HNS treatment were also calculated using the contact angle *** experimental results showed that HNS exhibited a good performance in inhibiting shale swelling and *** with the use of water,the use of HNS resulted in a 20%smaller linear swelling height of the bentonite pellets and an 11.53 times higher recovery of water-sensitive shale—a performance that exceeds those of the commonly used shale inhibitors KCl and *** importantly,the addition of HNS was effective in preventing a decrease in shale *** to the mechanism study,the good wellbore-strengthening performance of HNS can be attributed to three ***,the positively charged HNS balances parts of the negative charges of clay by means of electrostatic adsorption,thus inhibiting osmotic ***,HNS fabricates a lotus-leaf-like surface with a micro-nano hierarchical structure on shale after adsorption,which significantly increases the water contact angle of the shale surface and considerably reduces the surface free energy,thereby inhibiting surface ***,the decrease in capillary action and the effective plugging of the shale pores reduce the invasion of water and promote wellbore *** approach described herein may provide an avenue for inhibiting both the surface hydration and the os

关键词： Hydrophobic Nanoparticle Shale inhibitor drilling fluid Wellbore stability

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Annealing textures of low stacking fault energy (SFE) FCC materials: Traversing binary to high entropy alloys (HEAs)

Journal of Alloys and Metallurgical Systems

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Journal of Alloys and Metallurgical Systems 2024年 8卷

作者： Bhattacharjee, P.P. Teja, N. Sai Paul, S. Ojha, P.K. Saha, r. Department of Materials Science and Metallurgical Engineering Indian Institute of Technology Hyderabad Kandi Telangana Sangareddy502284 India R&D Division TATA Steel Jharkhand Jamshedpur831001 India

Although the origin of brass-type deformation texture in low SFE alloys has been extensively investigated, the annealing textures of such materials have received less attention, mostly limited to brass and different austenitic steels. On the other hand, the annealing textures of low SFE HEAs have been investigated more intensively recently;however, a comprehensive insight into annealing texture formation from HEAs down to binary systems is missing. To bridge the gap, the annealing texture of FCC single-phase Cu-11.6 at%Al alloy with SFE ∼10 mJm−2 comparable to HEAs was first investigated as a model binary system and compared with selected low SFE binary, medium entropy (MEAs), and HEAs to understand the similarities and characteristic differences. The cold-rolled alloy showed massive nanostructure and a typical brass-type texture featured by a strong B ({110}) component expected for a low SFE alloy. Annealing resulted in ultrafine recrystallized microstructure but extensive grain growth at higher temperatures, like other binary alloys but unlike HEAs. The annealing texture showed the retention of deformation components, weak α-fiber (Nd//) components and a high random fraction. These features were very similar to HEAs/MEAs and attributed to the absence of oriented nucleation (ON) or oriented growth (OG) mechanisms. However, striking differences such as strong Br ({236}) and d ({113}) components in the brass alloy, selective growth of the G ({110}) and G/B ({110}) in binary Ni-60wt%Co alloy, and strong retention of the {110} component in the annealing texture of (FCC+B2) dual-phase AlCrFe2Ni2 HEA were remarkable. These outcomes indicated underlying microstructural effects on annealing texture formation in low SFE binary to HEAs/MEAs and should motivate further research. © 2024 The Authors

关键词： Cobalt alloys

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Improving robustness of GNN-based Anomaly detection by Graph Adversarial Training 30

Improving Robustness of GNN-based Anomaly Detection by Graph...

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Joint 30th International Conference on Computational Linguistics and 14th International Conference on Language resources and Evaluation, LrEC-COLING 2024

作者： Zheng, Xiangping Wu, Bo Zhang, Alex X. Li, Wei College of Computer Science and Technology Harbin Engineering University China R&D and External Relations Department Xiangjiang Laboratory China Modeling and Emulation in E-Government National Engineering Laboratory China Harvest Fund Management Co. Ltd. China Qingdao Innovation and Development Base of Harbin Engineering University China

ISBN: (纸本)9782493814104

Graph neural networks (GNNs) play a fundamental role in anomaly detection, excelling at the identification of node anomalies by aggregating information from neighboring nodes. Nonetheless, they exhibit vulnerability to attacks, with even minor alterations in the graph structure or node attributes resulting in substantial performance degradation. To address this critical challenge, we introduce an innovative mechanism for graph adversarial training, meticulously designed to bolster GNN-based anomaly detection systems against potential poisoning attacks. This novel approach follows a two-step framework. (1) In the initial phase, we employ a Multiple-Objective Generative Adversarial Attack (MO-GAA), which focuses on generating feature modifications and inducing structural disruptions within the graph. Its primary objective is to mimic the adversarial behavior of potential attackers on the anomaly detection graph, with the explicit intention of confounding the anomaly detector. (2) In the subsequent stage, we introduce Purification-Based Adversarial Attack defense (PB-AAd), a method specifically designed to rectify any contamination and restore the integrity of the graph. The central aim of PB-AAd is to counteract the destructive actions carried out by potential attackers. Our empirical findings, derived from extensive experiments conducted on four real-world anomaly detection datasets, serve to demonstrate how MO-GAA systematically disrupts the graph, compromising the effectiveness of GNN-based detectors, while PB-AAd effectively mitigates these adversarial actions, thereby enhancing the overall robustness of GNN-based anomaly detectors. © 2024 ELrA Language resource Association: CC BY-NC 4.0.

关键词： Anomaly detection

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Hypergraph-Based Session Modeling: A Multi-Collaborative Self-Supervised Approach for Enhanced recommender Systems 30

Hypergraph-Based Session Modeling: A Multi-Collaborative Sel...

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Joint 30th International Conference on Computational Linguistics and 14th International Conference on Language resources and Evaluation, LrEC-COLING 2024

ISBN: (纸本)9782493814104

Session-based recommendation (SBr) is a challenging task that involves predicting a user's next item click based on their recent session history. Presently, many state-of-the-art methodologies employ graph neural networks to model item transitions. Notwithstanding their impressive performance, graph-based models encounter significant challenges when confronted with intricate session dependencies and data sparsity in real-world scenarios, ultimately constraining their capacity to enhance recommendation accuracy. In recognition of these challenges, we introduce an innovative methodology known as'Mssen,' which stands for Multi-collaborative self-supervised learning in hypergraph neural networks. Mssen is meticulously crafted to adeptly discern user intent. Our approach initiates by representing session-based data as a hypergraph, adeptly capturing intricate, high-order relationships. Subsequently, we employ self-supervised learning on item-session hypergraphs to mitigate the challenges of data sparsity, all without necessitating manual fine-tuning, extensive search, or domain-specific expertise in augmentation selection. Comprehensive experimental analyses conducted across multiple datasets consistently underscore the superior performance of our approach when compared to existing methodologies. © 2024 ELrA Language resource Association: CC BY-NC 4.0.

关键词： Graph neural networks

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Enhancing So2 resistance in Vanadium Catalysts with Tungsten disulfide for Nh3-Scr

SSRN

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SSrN 2024年

作者： Kim, donghyeok Lee, Myeung-Jin Choi, Yejin Kim, Jongkyoung Jeong, Bora Ye, Bora Cho, Seungho Kim, Hong-dae Green Materials & Processes R&D Group Korea Institute of Industrial Technology Ulsan44413 Korea Republic of Department of Materials Science and Engineering Ulsan National Institute of Science and Technology Ulsan44419 Korea Republic of

NOx emissions are a major environmental issue, and NH3-SCr is a key method for their control. V-based catalysts perform well at high temperatures;however, SO2-poisoning remains a critical issue for NH3-SCr catalysts under low-temperature conditions. In this study, we develop an effective strategy of loading a stable sulfide two-dimensional (2d) material, WS2, to enhance the SO2 resistance of existing commercial V/Ti catalysts. In-situ drIFTS analysis and spent SO2-poisoning catalyst analyses are conducted to clarify the enhanced SO2 resistance mechanism. These findings demonstrate that the superior SO2 resistance can be attributed to the suppression of SO2 by WS2. Therefore, WS2 loading inhibits the SO2 adsorption and protects the NH3 species adsorption, thereby enhancing the SO2 resistance and low-temperature activity. This research can be utilized without changing the catalyst synthesis process, allowing it to be applied to current commercial catalysts, thereby underscoring its remarkable potential for industrial applications. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

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Synergy of heterogeneous Co/Ni dual atoms enabling selective C-O bond scission of lignin coupling with in-situ N-functionalization

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Journal of Energy Chemistry 2024年第5期92卷 16-25页

作者： Baoyu Wang Jinshu Huang Hongguo Wu Ximing Yan Yuhe Liao Hu Li National Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide&Agricultural BioengineeringMinistry of EducationState-Local Joint Laboratory for Comprehensive Utilization of BiomassCollege of Pharmacy&Center for R&D of Fine ChemicalsGuizhou UniversityGuiyang 550025GuizhouChina Guangxi Key Laboratory of Green Chemical Materials and Safety Technology Beibu Gulf UniversityQinzhou 535011GuangxiChina Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640GuangdongChina

Selective cleavage of Csp^(2)-OCH_(3)bond in lignin without breaking other types of C-O bonds followed by N-functionalization is fascinating for on-purpose valorization of ***,a Co/Ni-based dual-atom catalyst CoNidA@NC prepared by in-situ evaporation and acid-etching of metal species from tailor-made metal–organic frameworks was efficient for reductive upgrading of various lignin-derived phenols to cyclohexanols(88.5%–99.9%yields),which had ca.4 times higher reaction rate than the single-atom catalyst and was superior to state-of-the-art heterogeneous *** synergistic catalysis of Co/Ni dual atoms facilitated both hydrogen dissociation and hydrogenolysis steps,and could optimize adsorption configuration of lignin-derived methoxylated phenols to further favor the Csp^(2)-OCH_(3)cleavage,as elaborated by theoretical ***,the CoNi_(dA)@NC catalyst was highly recyclable,and exhibited excellent demethoxylation performance(77.1%yield)in real lignin monomer *** in-situ cascade conversion processes assisted by dual-atom catalysis,various high-value N-containing chemicals,including caprolactams and cyclohexylamines,could be produced from lignin.

关键词： Biomass conversion Heterogeneous catalysis Lignin dual-atom catalyst Selective C-ocleavage

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Measurement and analysis of acoustic characteristics of panel type sensor arrays in an open water tank 24

Measurement and analysis of acoustic characteristics of pane...

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24th International Congress on Acoustics, ICA 2022

作者： Kim, Kyungseop Pyo, Seonghun Kwon, Byung-Jin Chang, Woosuk Lee, Jeong-Min Agency for Defense Development Maritime Technology Research Institute Korea Republic of LIG Nex1 Co. Ltd. Maritime R&D Lab. Korea Republic of

A new method is presented for acoustic measurement of a panel type sensor module in open water tank. The method utilizes the data from the hydrophones, which have in-plane three different positions, of the sensor module. It provides an estimation of the edge-diffracted pressure field as well as the sensor receiving field (incident/reflected pressure) for the finite-sized module. The method is applied on the synthetic and experimental data to confirm the validity. diffraction effects on the measurement of the acoustic characteristics are examined, and distribution characteristics of scattering sound field around panels according to sample size and composition of the panel materials are also analyzed. © ICA *** rights reserved

关键词： Acoustic measurement diffraction Panel

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