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Enhancing the TRIP Effect by Pre-Ferrite in the Hot Rolled Fe-8Mn-4Ni-3Al-0.1C Steel

ISIJ International 2025年第4期65卷 571-575页

作者： Zhang, Linfeng Matsugi, Kazuhiro Xu, Zhefeng Choi, Yongbum Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima739-8527 Japan State Key Laboratory of Metastable Materials Science and Technology Yanshan University No. 438 Hebei Street Qin Huangdao066-000 China

As is well known, reconstruction of the initial microstructure before an inter-critical annealing (IA) can optimize the final microstructure as well as improve mechanical performance. In this study, the initial microstructure with "pre-ferrite + martensite" was designed via two-stage cooling in the rolling process. The final microstructure observation showed that bimodal size distributed austenite and double morphologies of austenite. Moreover, lath-shaped austenite existed in the martensitic matrix;blocky austenite occurred at the boundaries of pre-ferrite. According to the numerical simulations of the IA process, blocky austenite tended to be more stable with smaller size and higher Mn concentrations than lath-shaped austenite. The characteristics of austenite were similar at different IA temperatures, but the lower IA temperatures, the smaller size of austenite. An excellent combination of strength (1 308 MPa) and ductility (34%) was obtained at 928 K, which was ascribed to a positive TRIP effect induced by the austenite with a large stability gradient. © 2025 The Iron and Steel Institute of Japan.

关键词： Ductility

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Evaluating the A3RSRP Handover to Determine Optimal Performance in HetNet using Stochastic Petri Net 6

Evaluating the A3RSRP Handover to Determine Optimal Performa...

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6th International Conference on System Reliability and Safety engineering, SRSE 2024

作者： Zhu, Zhiyi Zheng, Junjun Takimoto, Eiji Finnerty, Patrick Ohta, Chikara Kobe University Graduate School of System Informatics Kobe Japan Hiroshima University Graduate School of Advanced Science and Engineering Hiroshima Japan Nara Women's University Information Technology Center Nara Japan

ISBN: (纸本)9798350356083

Handover is necessary for improving user equipment (UE) communication quality among different cells in mobile communication networks. However, the handover decision algorithm (HDA) parameters are often difficult to choose. The use of an inappropriate parameter, such as a handover margin (HOM), causes handover failure (HoF) or frequent handover (FHO), especially in heterogeneous networks (HetNet). Therefore, properly determining a handover parameter is crucial for avoiding the HoF and FHO, as well as improving network performance. In this paper, we propose a stochastic Petri Net (SPN) to model the behavior of a UE in a HetNet. We also evaluate and predict the impact on HoF and FHO by different values of HOM in the steady-state, where the FHO is considered as handover trigger probability (HoT). Finally, the HOM value for optimal handover performance is determined using the absolute difference between the HoF and HoT through numerical experiments. The optimal handover performance was obtained at a HOM value of 6.0 dB using the proposal SPN. © 2024 IEEE.

关键词： Mobile telecommunication systems

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Composition-dependent structural characteristics and mechanical properties of amorphous SiBCN ceramics by ab-initio calculations

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Journal of advanced Ceramics 2023年第5期12卷 984-1000页

作者： Yuchen Liu Yu Zhou Dechang Jia Zhihua Yang Wenjiu Duan Daxin Li Shuzhou Li Ralf Riedel Bin Liu Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institut für Materialwissenschaft Technische Universität DarmstadtDarmstadt D-64287Germany

The atomic structural features and the mechanical properties of amorphous silicoboron carbonitride ceramics with 13 different compositions in the Si–BN–C phase diagram are investigated employing ab-initio *** chemical bonds and local structures within the amorphous network relate to the elemental *** distribution of nine types of chemical bonds is composition-dependent,where the B–C,Si–N,Si–C,and B–N bonds hold a large proportion for all *** prefers to be tetrahedrally coordinated,while B and N prefer sp^(2)-like trigonal *** the case of C,the tetrahedral coordination is predominant at relatively low C contents,while the trigonal coordination is found to be the main feature with the increasing C *** local structural characteristics greatly influence the mechanical properties of SiBCN *** the studied amorphous ceramics,SiB_(2)C_(3)N_(2) and SiB_(3)C_(2)N_(3) with low Si contents and moderate C and/or BN contents have high elastic moduli,high tensile/shear strengths,and good debonding *** increment of Si,C,and BN contents on this basis results in the decrease of mechanical *** increasing Si content leads to the increment of Si-contained bonds that reduce the bond strength of SiBCN ceramics,while the latter two cases are attributed to the raise of sp^(2)-like trigonal configuration of C and *** discoveries are expected to guide the composition-tailored optimization of SiBCN ceramics.

关键词： ultra-high-temperature ceramics density functional theory(DFT) amorphous structure mechanical properties

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Nb-Nb Direct Bonding Pads for Superconducting Devices and Their Failure Mode 12

Nb-Nb Direct Bonding Pads for Superconducting Devices and Th...

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12th IEEE CPMT Symposium Japan, ICSJ 2023

作者： Kudo, Atsushi Fujino, Masahisa Nakagawa, Hiroshi Kikuchi, Katsuya Araga, Yuki Taino, Toru Graduate School of Science and Engineering Saitama University Saitama Japan Device Technology Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Japan

Direct bonding of Nb was performed for 3D integration of superconducting devices. Electrical properties and superconducting transition temperatures were measured to investigate the effect of fast atomic beam on the bo... 详细信息

ISBN: (纸本)9798350325157

关键词： Niobium alloys

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Matthew effect:General design strategy of ultra-fluorogenic nanoprobes with amplified dark–bright states in aggregates

Aggregate

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Aggregate 2024年第2期5卷 482-492页

作者： Shinsuke Segawa Xinwen Ou Tianruo Shen Tomohiro Ryu Yuki Ishii Herman H.Y.Sung Ian D.Williams Ryan T.K.Kwok Ken Onda Kiyoshi Miyata Xuewen He Xiaogang Liu Ben Zhong Tang Translational and Advanced Bioimaging Laboratory Department of Chemical and Biological EngineeringSchool of EngineeringThe Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced StudyThe Hong Kong University of Science and TechnologyKowloonHong KongChina Science Mathematics and Technology ClusterSingapore University of Technology and DesignSingaporeSingapore Department of Chemistry Graduate School of ScienceKyushu UniversityNishi-kuFukuokaJapan The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsuChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenGuangdongChina

Fluorescence imaging,a key technique in biological research,frequently utilizes fluorogenic probes for precise imaging in living *** is an effective emission quencher in fluorogenic probe designs,which can be selectively damaged upon bioorthogonal click reactions,leading to considerable emission *** significant efforts to increase the emission enhancement ratio(I_(AC)/I_(BC))of tetrazine-functionalized fluorogenic probes,the influence of molecular aggregation on the emission properties has been largely overlooked in these probe *** this study,we reveal that an ultrahigh I_(AC)/I_(BC)can be realized in the aggregate system when tetrazine is paired with aggregation-induced emission(AIE)*** amplifies its quenching efficiency upon aggregation and drastically reduce background *** click reactions damage tetrazine and trigger significant AIE,leading to considerably enhanced I_(AC)/I_(BC).We further showcase the capability of these ultra-fluorogenic systems in selective imaging of multiple organelles in living *** term this unique fluorogenicity of AIE luminogen-quencher complexes with amplified dark-bright states as“Matthew effect”in aggregate emission,potentially providing a universal approach to attain ultrahigh I_(AC)/I_(BC)in diverse fluorogenic systems.

关键词： aggregation-induced emission bioorthogonal chemistry click chemistry fluorescence imaging tetrazine

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Batch Sorption of PFOS onto Local Soils in Japan

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Zairyo/Journal of the Society of Materials science, Japan 2024年第1期73卷 64-69页

作者： Yoshimura, Hiro Okada, Takaomi Takai, Atsushi Kato, Tomohiro Yukioka, Satoru Tanaka, Shuhei Yasutaka, Tetsuo Katsumi, Takeshi Graduate School of Engineering Kyoto Univ. Sakyo-ku Kyoto615-8501 Japan Graduate School of Global Environmental Studies Kyoto Univ. Sakyo-ku Kyoto606-8501 Japan Institute for Geo-Resource and Environment Advanced Industrial Science and Technology Higashi Tsukuba305-8567 Japan

Perfluorooctane sulfonate (PFOS) contamination in groundwater and soil has become a global problem. Although evaluating the sorption performance of soils against PFOS is essential for considering the proper countermeasures, limited research has been conducted in Japan. This study investigated the sorption kinetics and isotherms using local Japanese soils. In addition, the relation between the sorbed amount of PFOS and the basic properties of local Japanese soils was evaluated. The results of sorption kinetics were well fitted to the pseudo-first-order or pseudo-second-order models, except for the case using silica sand at the initial PFOS concentration of 1 mg/L. Sorption equilibrium against PFOS was achieved after approximately 24 hours. The Langmuir model can well describe PFOS sorption isotherms for four soils. A positive correlation was obtained between sorbed amount and soil properties such as Organic Carbon (OC), fines content, and aluminium oxide (Al2O3) content. Results implied that the soil properties should be carefully examined when we discuss the sorption performance against PFOS. © 2024 The Society of Materials science, Japan.

关键词： Soils

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In situ decorating the surface and interlayer of montmorillonite with Co_(0.5)Ni_(0.5)Fe_(2)O_(4) nanoparticles: A sustainable, biocompatible colorimetric platform for H_(2)O_(2) and acetylcholine

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Nano Research 2022年第10期15卷 9319-9326页

作者： Xixi Zhu Hongyu Li Tao Wu Hui Zhao Kaili Wu Wenjing Xu Fengjuan Qin Wenxing Chen Jinlong Zheng Qingyun Liu College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China Beijing Advanced Innovation Center for Materials Genome Engineering Shunde Graduate SchoolSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Originated from nature and used for nature is a way of sustainable *** this work,montmorillonite(MMT),a natural two-dimensional(2D)layered mineral,the surface and interlayer of which were nano-decorated by chemical synthesis technique was applied in biological detection *** ferrite(Co_(0.5)Ni_(0.5)Fe_(2)O_(4))was anchored on the surface and intercalated in the interlayer of montmorillonite,which served as a competitive candidate of enzyme *** test toward HUVEC and Hela cells verified the good biocompatibility of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT,guaranteeing its safety in biological *** on the peroxidase-like activity of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT,a colorimetric sensing platform for H_(2)O_(2) was established by a facile mix-anddetect approach with the detection limit of 0.565μM(3σ/slope).It was implied that the peroxidase-like activity of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT was originated from generation of·OH and·O_(2)–produced from catalytic decomposition process of H_(2)O_(2).Coupled with cascaded catalytic reactions of ACh,a facile and efficient sensing platform for ACh with satisfactory anti-interference ability was ***,all these remarkable features highlighted the superiority of Co_(0.5)Ni_(0.5)Fe_(2)O_(4)-MMT,and endowed it with a powerful competitiveness in the fields of environmental assessing,biosensing,and disease monitoring.

关键词： montmorillonite colorimetric assays hydrogen peroxide peroxidase-like activity nanozymes

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Single-Mode-VCSEL With a Ring-Shaped Self-Aligned Recessed Metal Mode Filter

IEEE Electron Device Letters

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IEEE Electron Device Letters 2023年第8期44卷 1316-1319页

作者： Cheng, Hao-Tien Min, Szu-Yu Yang, Yun-Cheng Lin, Han-Yu Pan, Jian-Syun Wu, Chao-Hsin Graduate Institute of Electronics Engineering and the Center for Quantum Science and Engineering National Taiwan University Taipei106319 Taiwan Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei106319 Taiwan Graduate Institute of Electronics Engineering The Center for Quantum Science and Engineering The Graduate Institute of Photonics and Optoelectronics The Graduate School of Advanced Technology National Taiwan University Taipei106319 Taiwan

This letter presents a single-mode vertical-cavity surface-emitting laser (VCSEL) using a novel ring-shaped self-aligned recessed metal (SARM) mode filter on the emitting window as a means of transverse mode control. The SARM structure acts as a spatial filter to suppress the higher-order transverse modes through selective recessed-etching of the top mirror and the self-aligned deposition of the p-type contact metals for cavity tuning and blocking the higher-order modes. The SARM mode filter could be a potentially high-yield alternative technique for the mass production of single-mode VCSELs, demonstrating a single-mode emission with 1.55-mW power and a 30.7-dB side mode suppression ratio. © 1980-2012 IEEE.

关键词： Surface emitting lasers

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Slip system analysis of magnesium alloy AZ31B in warm compression by Visco-Plastic Self-Consistent simulation

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第2期74卷 73-82页

作者： Matsuoka, Yusuke Bian, Mingzhe Tsukada, Yuhki Koyama, Toshiyuki Chino, Yasumasa Department of Materials Design Innovation Engineering Graduate School of Engineering Nagoya University Furo-Cho Chikusa-Ku Aichi Nagoya-shi464-8603 Japan Department of Materials Design Innovation Engineering Graduate School of Engineering Nagoya University Aichi Nagoya-shi Japan Multi-Material Research Institute National Institute of Advanced Industrial Science and Technology（AIST） Aichi Nagoya-shi Japan

The active deformation mode (slip systems and twinning) of extruded AZ31B alloy (Mg-3Al-1Zn, mass%) during compression at RT, 100°C and 150°C was investigated by visco-plastic self-consistent (VPSC) simulation. Compression tests were first performed to obtain compression curve of AZ31B. The VPSC model was fitted to the compression curves to estimate the Voce hardening parameters which are required for the VPSC simulation. In the case of compression along the extrusion direction, work-hardening occurred rapidly with the transition of dominant deformation modes at all temperatures. In the case of compression to the other directions, basalslip was dominant throughout the deformation at all compression temperatures. In addition, prismaticslip and tensile twin were active in the early stage of deformation, and pyramidalslip became active in the later stage of deformation. Pyramidalslip became more active with increasing temperature from RT to 100°C, whereas basaland prismaticslips became more active with increasing temperature from 100°C to 150°C. These different trends in the change of the active slip system with increasing temperature can be attributed to the CRSS maximum of the pyramidalslip located around 100°C. © 2024 Japan Institute of Light Metals. All rights reserved.

关键词： Magnesium alloys

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HKDSME: Heterogeneous Knowledge Distillation for Semi-supervised Singing Melody Extraction Using Harmonic Supervision 24

HKDSME: Heterogeneous Knowledge Distillation for Semi-superv...

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32nd ACM International Conference on Multimedia, MM 2024

作者： Yu, Shuai He, Xiaoliang Chen, Ke Yu, Yi School of Computer Science and Technology Donghua University Shanghai China University of California San Diego San Diego United States Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Japan

ISBN: (纸本)9798400706868

Singing melody extraction is a key task in the field of music information retrieval (MIR). However, decades of research works have uncovered two difficult issues. First, binary classification on frequency-domain audio features (e.g., spectrogram) is regarded as the primary method, which ignores the potential associations of musical information at different frequency bins, as well as their varying significance for output decisions. Second, the existing semi-supervised singing melody extraction models ignore the accuracy of the generated pseudo labels by semi-supervised models, which largely limits the further improvements of the model. To solve the two issues, in this paper, we propose a heterogeneous knowledge distillation framework for semi-supervised singing melody extraction using harmonic supervision, termed as HKDSME. We begin by proposing a four-class classification paradigm for determining the results of singing melody extraction using harmonic supervision. This enables the model to capture more information regarding melodic relations in spectrograms. To improve the accuracy issue of pseudo labels, we then build a semi-supervised method by leveraging the extracted harmonics as a consistent regularization. Different from previous methods, it judges the availability of unlabeled data in terms of the inner positional relations of extracted harmonics. To further build a light-weight semi-supervised model, we propose a heterogeneous knowledge distillation (HKD) module, which enables the prior knowledge to transfer between heterogeneous models. We also propose a novel confidence guided loss, which incorporates with the proposed HKD module to reduce the wrong pseudo labels. We evaluate our proposed method using several well-known public available datasets, and the findings demonstrate the efficacy of our proposed method. © 2024 ACM.

关键词： harmonic supervision

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