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Copper Precipitation Behavior and Mechanical Properties of Cu‑Bearing Ferritic Stainless Steel with Diferent Cr Addition

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Acta Metallurgica Sinica(English Letters) 2025年第3期38卷 383-395页

作者： Yifan Li Shengyao Ma Xinrui Zhang Tong Xi Chunguang Yang Hanyu Zhao Ke Yang Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The microstructure evolution and mechanical properties of Cu-bearing ferritic stainless steel with diferent Cr addition(Cr=12,15 and 17 wt%)were *** phase transformation behavior under diferent cooling rate,Cu-rich precipitation behavior and its infuence on the mechanical properties under diferent aging treatment are systematically characterized using dilatometry,diferential scanning calorimeter(DSC)and transmission electron microscopy(TEM).The results indicated that the increase in Cr content narrowed the austenite phase region at high temperatures,afecting its microstructure under diferent cooling *** 12Cr-1.5Cu steel exhibited a fully austenitic phase region at high temperature and occurred apparent martensitic transformation after air *** rate signifcantly infuenced the phase transition of the steels,and subsequently afected its mechanical *** three investigated steels showed higher strength and lower plasticity in air cooling condition compared to furnace cooling condition,due to the presence of *** aging treatment,high number densities of Cu-rich precipitates were formed in steel matrix and the size of Cu-rich precipitates increased obviously with increasing aging temperature,while the tendency for number density was *** and dispersed Cu-rich precipitates formed during low-temperature aging enhanced strength of the steels,while larger Cu-rich phases developed during high-temperature aging endowed greater ductility to the ***,the Cr content had no signifcant efect on the precipitation behavior of Cu-rich *** comprehensive results and analyses could provide a solid foundation for broader applications of Cu-bearing ferritic stainless steels.

关键词： Cu-bearing stainless steel Mechanical property Cu-rich precipitate Microstructure

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Algorithms for online fault tolerance server consolidation

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Digital Communications and Networks 2025年第2期11卷 514-523页

作者： Boyu Li Bin Wu Meng Shen Hao Peng Weisheng Li Hong Zhang Jie Gan Zhihong Tian Guangquan Xu College of Intelligence and Computing Tianjin University School of Cyberspace Science and Technology Beijing Institute of Technology School of Computer Science and Technology Zhejiang Normal University School of Computer Science and Technology Chongqing University of Posts and Telecommunications School of Astronautics Beihang University School of Computer Science University of Sydney Cyberspace Institute of Advanced Technology Guangzhou University

We study a novel replication mechanism to ensure service continuity against multiple simultaneous server failures. In this mechanism, each item represents a computing task and is replicated into ξ + 1 servers for some integer ξ ≥ 1, with workloads specified by the amount of required resources. If one or more servers fail, the affected workloads can be redirected to other servers that host replicas associated with the same item, such that the service is not interrupted by the failure of up to ξ servers. This requires that any feasible assignment algorithm must reserve some capacity in each server to accommodate the workload redirected from potential failed servers without overloading, and determining the optimal method for reserving capacity becomes a key issue. Unlike existing algorithms that assume that no two servers share replicas of more than one item, we first formulate capacity reservation for a general arbitrary scenario. Due to the combinatorial nature of this problem, finding the optimal solution is difficult. To this end, we propose a Generalized and Simple Calculating Reserved Capacity(GSCRC) algorithm, with a time complexity only related to the number of items packed in the server. In conjunction with GSCRC, we propose a robust replica packing algorithm with capacity optimization(RobustPack), which aims to minimize the number of servers hosting replicas and tolerate multiple server failures. Through theoretical analysis and experimental evaluations, we show that the RobustPack algorithm can achieve better performance.

关键词： Cloud computing Server consolidation Replica Fault tolerance

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Effect of compact strip processing on segregation behavior and mechanical properties of Q&P steel

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Journal of Iron and Steel Research International 2025年第3期32卷 733-742页

作者： Ming-yue Yang Sheng-wei Wang Shui-ze Wang Yu-he Huang Xin-ping Mao Institute for Carbon Neutrality University of Science and Technology BeijingBeijing100083China Institute for Steel Sustainable Technology Liaoning Academy of MaterialsShenyang110000LiaoningChina Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China

The microstructure and mechanical properties of the compact strip production(CSP)processed quenching and partitioning(Q&P)steels were investigated through experimental methods to address the challenge of designing high-performance Q&P *** with the conventional process(CP)produced samples,with slightly reduced strength,the total elongation of the CSP produced samples was increased by nearly 7%.Microstructural analysis revealed that variations in austenite stability were not the primary cause for the differences in mechanical properties between the CSP and the *** CSP processed Q&P steel exhibited milder center segregation behavior in contrast to the CP processed Q&P ***,in the CSP processed Q&P steel,a higher proportion of austenite and a lower proportion of martensite were observed at the center position,delaying the crack initiation in the central region and contributing to the enhanced *** investigation into the CSP process reveals its effect on alleviation of segregation and enhancement of mechanical properties of the Q&P steel.

关键词： Compact strip production Conventional process Segregation Martensite transformation Quenching and partitioning steel Retained austenite

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Multifunctional Nacre‑Like Nanocomposite Papers for Electromagnetic Interference Shielding via Heterocyclic Aramid/MXene Template‑Assisted In‑Situ Polypyrrole Assembly

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Nano-Micro Letters 2025年第3期17卷 37-54页

作者： Jinhua Xiong Xu Zhao Zonglin Liu He Chen Qian Yan Huanxin Lian Yunxiang Chen Qingyu Peng Xiaodong He National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080People’s Republic of China

Robust, ultra-flexible, and multifunctional MXene-basedelectromagnetic interference (EMI) shielding nanocomposite filmsexhibit enormous potential for applications in artificial intelligence,wireless telecommunication, and portable/wearable electronic *** this work, a nacre-inspired multifunctional heterocyclic aramid(HA)/MXene@polypyrrole (PPy) (HMP) nanocomposite paper withlarge-scale, high strength, super toughness, and excellent tolerance tocomplex conditions is fabricated through the strategy of HA/MXenehydrogel template-assisted in-situ assembly of PPy. Benefiting from the"brick-and-mortar" layered structure and the strong hydrogen-bondinginteractions among MXene, HA, and PPy, the paper exhibits remarkable mechanical performances, including high tensile strength (309.7 MPa),outstanding toughness (57.6 MJ m−3), exceptional foldability, and structural stability against ultrasonication. By using the template effect ofHA/MXene to guide the assembly of conductive polymers, the synthesized paper obtains excellent electronic conductivity. More importantly,the highly continuous conductive path enables the nanocomposite paper to achieve a splendid EMI shielding effectiveness (EMI SE) of 54.1 dBat an ultra-thin thickness (25.4 μm) and a high specific EMI SE of 17,204.7 dB cm2g−1. In addition, the papers also have excellent applicationsin electromagnetic protection, electro-/photothermal de-icing, thermal therapy, and fire safety. These findings broaden the ideas for developinghigh-performance and multifunctional MXene-based films with enormous application potential in EMI shielding and thermal management.

关键词： MXene Remarkable mechanical properties Heterocyclic aramid Electromagnetic interference shielding Polypyrrole Multifunctionality

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Characteristics of PVD SiCN for Application in Hybrid Cu Bonding

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Journal of Semiconductor technology and science 2025年第1期25卷 102-108页

作者： Choi, Junyoung Jang, Suin Lee, Dongmyeong Kang, Sukkyung Kim, Sanha Kim, Sarah Eunkyung Department of Semiconductor Engineering Seoul National University of Science and Technology Korea Republic of Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Korea Republic of

To enhance the density and performance of semiconductor devices, 3D packaging with hybrid Cu bonding is emerging as a critical technology. One of the dielectrics used in hybrid Cu bonding is SiCN, typically deposited using PECVD (plasma-enhanced chemical vapor deposition). In this study, we investigated SiCN deposited at room temperature using PVD (physical vapor deposition). The SiCN, with a thickness of 150 nm, exhibited a surface roughness of 0.3-0.4 nm after the CMP (chemical mechanical polishing) process and a contact angle of about 10 degrees and dielectric constant of 3.9, indicating its potential as a dielectric for hybrid Cu bonding. And, PVD SiCN-SiCN bonding was performed at 260◦C, resulting in a uniform and void-free interface. © 2025, institute of Electronics Engineers of Korea. All rights reserved.

关键词： Chemical mechanical polishing

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Boosting bidirectional sulfur conversion enabled by introducing boron-doped atoms and phosphorus vacancies in Ni_(2)P for lithium-sulfur batteries

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Journal of Energy Chemistry 2025年第1期100卷 760-769页

作者： Lin Peng Yu Bai Hang Li Meixiu Qu Zhenhua Wang Kening Sun Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Lithium-sulfur (Li-S) batteries have gained great attention due to the high theoretical energy density and low cost,yet their further commercialization has been obstructed by the notorious shuttle effect and sluggish redox ***,we supply a strategy to optimize the electron structure of Ni_(2)P by concurrently introducing B-doped atoms and P vacancies in Ni_(2)P (Vp-B-Ni_(2)P),thereby enhancing the bidirectional sulfur *** study indicates that the simultaneous introduction of B-doped atoms and P vacancies in Ni_(2)P causes the redistribution of electron around Ni atoms,bringing about the upward shift of d-band center of Ni atoms and effective d-p orbital hybridization between Ni atoms and sulfur species,thus strengthening the chemical anchoring for lithium polysulfides (LiPSs) as well as expediting the bidirectional conversion kinetics of sulfur ***,theoretical calculations reveal that the incorporation of B-doped atoms and P vacancies in Ni_(2)P selectively promotes Li2S dissolution and nucleation ***,the Li-S batteries with Vp-B-Ni_(2)P-separators present outstanding rate ability of 777 m A h g^(-1)at 5 C and high areal capacity of 8.03 mA h cm^(-2)under E/S of 5μL mg^(-1)and sulfur loading of 7.20 mg cm^(-2).This work elucidates that introducing heteroatom and vacancy in metal phosphide collaboratively regulates the electron structure to accelerate bidirectional sulfur conversion.

关键词： B-doped atoms P vacancies Nickel phosphide Bidirectional sulfur conversion Lithium-sulfur batteries

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Experimental study on egress capacity of key facilities in pressurized oxygen-supplement compartments

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Chinese Physics B 2025年第1期34卷 536-546页

作者： Kai-Qiang Wang Xue-Hua Song Wei-Jun Liu Kang Wen Zhi-Gang Shi Jun Zhang Bin Yao Wei-Guo Song China Construction Institute of Advanced Technology Wuhan 450000China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China Business School University of Shanghai for Science and TechnologyShanghai 200093China School of Intelligent Emergency Management University of Shanghai for Science and TechnologyShanghai 200093China

Pressurized buildings have emerged as a novel architectural solution to alleviate altitude illness in high-altitude *** conventional buildings,evacuation from this kind of building has to experience a depressurization time,which results in air expansion and heat absorption,creating a dense fog and impairing sight within the *** experiments were performed in a pressurized oxygen-supplement compartment to investigate the pedestrian motion *** on the questionnaires,participants reported varying degrees of symptoms such as ear blockage,reduced environmental noise,and dizziness,which had a measurable impact on their *** focus on the evacuation parameters through three basic building components:staircases,pressure transition cabins,and escape *** the visibility in the compartment decreases from high to low,the movement patterns of pedestrian shift from triangular to single-file with a significant decline in evacuation *** is found that there is a linear relationship between evacuation time and the number of evacuees through escape *** pressure transition cabin is a crucial evacuation route in emergencies,and evacuation time is recommended as the key metric for assessing its *** findings offer valuable insights for emergency evacuation strategies in pressurized buildings.

关键词： altitude visibility architectural

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Cutting Force and State Identification in High-Speed Milling:a Semi-Analytical Multi-Dimensional Approach

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Chinese Journal of Mechanical Engineering 2025年第1期38卷 140-160页

作者： Yu Zhang Xianyin Duan Kunpeng Zhu School of Machinery and Automation Wuhan University of Science and TechnologyWuhan 430081China Lab of Precision Manufacturing Institute of Advanced Manufacturing TechnologyHefei Institutes of Physical ScienceChinese Academy of SciencesChangzhou 213164China

High-speed milling(HSM)is advantageous for machining high-quality complex-structure surface components with various *** and estimating cutting force signals for characterizing HSM is of high ***,considering the tool runout and size effects,many proposed models focus on the material and mechanical *** study presents a novel approach for predicting micromilling cutting forces using a semianalytical multidimensional model that integrates experimental empirical data and a mechanical theoretical force model.A novel analytical optimization approach is provided to identify the cutting forces,classify the cutting states,and determine the tool runout using an adaptive algorithm that simplifies modeling and *** instantaneous un-deformed chip thickness(IUCT)is determined from the trochoidal trajectories of each tool flute and optimized using the bisection ***,the computational efficiency is improved,and the errors are *** tool runout parameters are identified from the processed displacement signals and determined from the preprocessed vibration signals using an adaptive signal processing *** is reliable and stable for determining tool runout and is an effective foundation for the force *** approach is verified using HSM ***,the determination coefficients are stable above *** is convenient and efficient for achieving the key intermediate parameters(IUCT and tool runout),which can be generalized to various machining conditions and operations.

关键词： Cutting force Tool runout Bisection method Discrete Fourier transform Generalization Table 1 The recursive algorithm of the least-squares solution of the coefficient matrix Kx

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In-Situ Pt-Decorated, Direct Growth of Mixed Phase 2H/1T–MoSe2 on Carbon Paper for Enhanced Hydrogen Evolution Reaction

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Energy & Environmental Materials 2025年第2期8卷 187-195页

作者： Jong-Hwan Park Sun-Woo Kim So Young Lee Yuri Jung Jae-Chul Ro Seong-Ju Park Hyoung-Juhn Kim Dong Han Seo Su-Jeong Suh School of Advanced Materials Science and Engineering Sungkyunkwan University Daegu Mechatronics & Materials Institute Energy Materials & Devices Department of Energy Engineering Korea Institute of Energy Technology KENTECH

Metal dichalcogenide-based 2D materials,gained considerable attention recently as a hydrogen evolution reaction（HER） *** this work,we synthesized MoSe2-based electrocatalyst via hydrothermal route with varying phase contents（1T/2H） and respective HER performances were evaluated under the acidic media（0.5 M H2SO4）,where best HER performance was obtained from the sample consisting of mixed 1T/2H phases,which was directly grown on a carbon paper(167 mV at10 mA cm-2) Furthermore,HER performance of electrocatalyst was further improved by in-situ electrodeposition of Pt nanoparticles（0.15 wt%） on the MoSe2 surface,which lead to significant enhancement in the HER performances(133 mV at 10 mA cm-2).Finally,we conducted density functional theory calculations to reveal the origin of such enhanced performances when the mixed 1T/2H phases were present,where phase boundary region（1T/2H heterojunction） act as a low energy pathway for H2adsorption and desorption via electron accumulation ***,presence of the Pt nanoparticles tunes the electronic states of the MoSe2based catalyst,resulting in the enhanced HER activity at heterointerface of 1T/2H MoSe2 while facilitating the hydrogen adsorption and desorption process providing a low energy pathway for *** results provide new insight on atomic level understanding of the MoSe2based catalyst for HER application.

关键词： 2D materials electrocatalysis HER mixed phase MoSe2

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Enhancing micro-scale SiO_(x)anode durability:Electro-mechanical strengthening of binder networks via anchoring carbon nanotubes with carboxymethyl cellulose

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Journal of Energy Chemistry 2025年第2期101卷 23-33,I0002页

作者： Chaeyeon Ha Jin Kyo Koo Jun Myoung Sheem Young-Jun Kim SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Nano Science and Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea Advanced Center for Convergence Energy Storage System Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Kore

With the increasing prevalence of lithium-ion batteries(LIBs)applications,the demand for high-capacity next-generation materials has also ***_(x)is currently considered a promising anode material due to its exceptionally high capacity for ***,the significant volumetric changes of SiO_(x)during cycling and its initial Coulombic efficiency(ICE)complicate its use,whether alone or in combination with graphite *** this study,a three-dimensional conductive binder network with high electronic conductivity and robust elasticity for graphite/SiO_(x)blended anodes was proposed by chemically anchoring carbon nanotubes and carboxymethyl cellulose binders using tannic acid as a chemical *** addition,a dehydrogenation-based prelithiation strategy employing lithium hydride was utilized to enhance the ICE of SiO_(x).The combination of these two strategies increased the CE of SiO_(x)from 74%to87%and effectively mitigated its volume expansion in the graphite/SiO_(x)blended electrode,resulting in an efficient electron-conductive binder *** led to a remarkable capacity retention of 94%after30 cycles,even under challenging conditions,with a high capacity of 550 mA h g^(-1)and a current density of 4 mA cm^(-2).Furthermore,to validate the feasibility of utilizing prelithiated SiO_(x)anode materials and the conductive binder network in LIBs,a full cell incorporating these materials and a single-crystalline Ni-rich cathode was *** cell demonstrated a~27.3%increase in discharge capacity of the first cycle(~185.7 mA h g^(-1))and exhibited a cycling stability of 300 ***,this study reports a simple,feasible,and insightful method for designing high-performance LIB electrodes.

关键词： Lithium-ionbatteries Siox anode Blended anode Carbon nanotubes Carboxymethyl cellulose Conductive binder network

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