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Effect of high silicon content in enhancing the creep properties of a PM near-α Ti–6Al–2Sn–4Zr–2Mo–0.5Y–0.5Si alloy

Journal of Materials Research and Technology 2025年 36卷 4864-4881页

作者： Xuemei Yu Fuyang Yu Bowen Zhang Xiaogang Wu Hongzhi Niu Deliang Zhang School of Material Science and Engineering Northeastern University Shenyang 110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang 110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry (Ministry of Education) Northeastern University Shenyang 110819 China

This study investigates the effect of high Si content on the creep properties and deformation mechanisms of a powder metallurgy (PM) near-α titanium alloy with a composition of Ti–6Al–2Sn–4Zr–2Mo–0.5Y–0.5Si (wt.%) fabricated using high-energy ball milling (HEBM) and thermomechanical powder consolidation (TMC). Under 600 °C/250 MPa, the alloy exhibits a 263 % increase in creep life, a 48 % reduction in steady-state creep rate, and 100 % improvement in creep fracture strain compared with the corresponding titanium alloy containing 0.1 wt% Si under the same fabrication and heat treatment conditions. The superior creep properties are attributed to the stabilized α/β and α/β t interfaces, the uniform dispersion of (Ti, Zr) 6 Si 3 nanoparticles, and the increased Si solubility in both α and β phases, all of which collectively hinder dislocation movement. Additionally, Si addition suppresses the formation of continuous α GB plates, while the presence of higher Si solubility and dispersed nanoscale silicides alleviates stress concentration, delays void and microcrack formation, and ultimately enhances creep fracture strain. These findings underscore the critical role of interface stability, nanoscale silicide dispersion, and enhancing Si solubility in optimizing high-temperature titanium alloys for extreme service environments.

关键词： Near-α titanium alloy Thermomechanical powder consolidation Effect of high silicon content Microstructure Creep property

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Safety Control of Switched Systems via Multiple Barrier Functions

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IEEE Transactions on Automatic Control 2025年

作者： Long, Lijun Huang, Chunxiao Sun, Zhendong Northeastern University College of Information Science and Engineering Shenyang110819 China Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University China

This paper is concerned with the problem of safety control for switched systems, where different safe sets are allowed for different subsystems and safety is not necessarily possessed for subsystems. A necessary and sufficient condition is presented for safety of switched systems by exploiting a multiple barrier functions (MBFs) method. To reveal the relationship about safety between subsystems and switched systems, an extended Nagumo's Theorem in the switched systems framework is derived. Also, several switched control design conditions are respectively provided to ensure safety of switched systems. Based on the union of MBFs and multiple Lyapunov functions (MLFs), a novel safety-critical control framework is established to simultaneously ensure safety and stability of switched systems. Also, an auxiliary cost function is introduced to transform the safety-critical optimal control (SCOC) problem of switched systems into the one of non-switched systems. Finally, three examples are illustrated to demonstrate the effectiveness of the proposed methods. © 1963-2012 IEEE.

关键词： Lyapunov functions

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Multi-Relational Geometric Regularization Framework for Multi-Modal Emotion Recognition in Conversation

Multi-Relational Geometric Regularization Framework for Mult...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Tao Zhang Zhenhua Tan Software College of Northeastern University Shenyang China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry (Northeastern University) China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Existing studies on multi-modal emotion recognition in conversation (MMERC) mainly focus on multi-modal fusion and context modeling for emotion representation, facing limitations in uncovering the intrinsic structure of emotion-related data. The existing geometric consistency regularization (GCR) technique aims to build meaningful latent feature structures in multiple modalities and has been validated for non-conversational data, therefore we further explore its application to the MMERC task, which involves conversational data. However, we find that the geometric consistency in conversational data varies among different speaker and conversation relations (intra-speaker, inter-speaker, and inter-conversation relations), probably due to differences in speaker expressions and conversation topics. This makes the direct application of GCR less effective. To address this issue, we propose a Multi-Relational Geometric Regularization Framework for MMERC (R 4 -MMERC). Our framework constructs geometric structures of conversational data and performs dynamically balanced consistency regularization based on multiple speaker and conversation relations (intra-speaker, interspeaker, and inter-conversation relations). We tested our framework by integrating it with three typical MMERC models on the IEMOCAP benchmark dataset. The results show significant performance improvements, demonstrating the effectiveness of our approach 1 .

关键词： Emotion recognition Computational modeling Oral communication Speech recognition Signal processing Benchmark testing Acoustics Proposals Speech processing Context modeling

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Construction of a Neural Network Potential for Fe-Cr-Ni Alloys and its Application in Uniaxial Tension Simulations

SSRN

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SSRN 2025年

作者： Wang, Kun Ren, Lin Liu, Zhongqiu Wang, Chun Zhang, Hao National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Ministry of Education China School of Metallurgy Northeastern University Shenyang110819 China

Fe-Cr-Ni alloys are widely used in industrial applications and serve as crucial high-temperature materials, for which accurate interatomic potential functions are essential for understanding their microstructure and properties. In this study, we developed a machine learning potential (Deep Potential, DP) with high precision for Fe-Cr-Ni alloys using the Deep Potential for Molecular Dynamics (DeePMD) framework combined with an extensive density functional theory (DFT) database. First, eight different crystal structures of the Fe-Cr-Ni system were systematically sampled through high-throughput first-principles calculations. We compared the accuracy of potentials trained on two distinct datasets using the DeepMD model. Subsequently, molecular dynamics simulations were employed to verify the performance of these potentials in predicting crystal structures, thermodynamic properties, and mechanical properties. The results demonstrate that the model trained with heating-process data exhibits superior accuracy in energy and force predictions, achieving root mean square errors (RMSE) of 3.27 meV/atom for atomic energy and 72.4 meV/Å for forces across the eight Fe-Cr-Ni systems. These predictions show excellent agreement with DFT-calculated energies. In large-scale molecular dynamics simulations, the DP demonstrates mechanical accuracy comparable to experimental values. Specifically, the elastic constant of Fe60Cr25Ni15 alloy calculated using the DP is 101.321 GPa, which is within a 1% error compared to the DFT-calculated value of 102.221 GPa. © 2025, The Authors. All rights reserved.

关键词： Crystal atomic structure

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The spectral Einstein functional for the Witten Deformation

arXiv

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arXiv 2025年

作者： Wu, Tong Wang, Yong Department of Mathematics Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Northeastern University Shenyang110819 China School of Mathematics and Statistics Northeast Normal University Changchun130024 China

In the paper, given two vector fields and the Witten deformation, we compute the spectral Einstein functional for the Witten deformation on even-dimensional spin manifolds without boundary. Copyright © 2025, The ... 详细信息

关键词： Statistical mechanics

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4D-CS: Exploiting Cluster Prior for 4D Spatio-Temporal LiDAR Semantic Segmentation

arXiv

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arXiv 2025年

作者： Zhong, Jiexi Li, Zhiheng Cui, Yubo Fang, Zheng The Faculty of Robot Science and Engineering Northeastern University Shenyang110819 China The National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Northeastern University Shenyang110819 China

Semantic segmentation of LiDAR points has significant value for autonomous driving and mobile robot systems. Most approaches explore spatio-temporal information of multi-scan to identify the semantic classes and motion states for each point. However, these methods often overlook the segmentation consistency in space and time, which may result in point clouds within the same object being predicted as different categories. To handle this issue, our core idea is to generate cluster labels across multiple frames that can reflect the complete spatial structure and temporal information of objects. These labels serve as explicit guidance for our dual-branch network, 4D-CS, which integrates point-based and cluster-based branches to enable more consistent segmentation. Specifically, in the point-based branch, we leverage historical knowledge to enrich the current feature through temporal fusion on multiple views. In the cluster-based branch, we propose a new strategy to produce cluster labels of foreground objects and apply them to gather point-wise information to derive cluster features. We then merge neighboring clusters across multiple scans to restore missing features due to occlusion. Finally, in the point-cluster fusion stage, we adaptively fuse the information from the two branches to optimize segmentation results. Extensive experiments confirm the effectiveness of the proposed method, and we achieve state-of-the-art results on the multi-scan semantic and moving object segmentation on SemanticKITTI and nuScenes datasets. The code will be available at https://***/NEU-REAL/***. Copyright © 2025, The Authors. All rights reserved.

关键词： Semantic Segmentation

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Model-independent H0 within FLRW: Joint constraints from GWTC-3 standard sirens and strong lensing time delays

arXiv

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arXiv 2025年

作者： Song, Ji-Yu Qi, Jing-Zhao Zhang, Jing-Fei Zhang, Xin Key Laboratory of Cosmology and Astrophysics Department of Physics College of Sciences Northeastern University Liaoning Province Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Northeastern University Shenyang110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China

The Hubble tension has emerged as a critical crisis in cosmology, with the cause remaining unclear. Determining the Hubble constant (H0) independently of cosmological models and distance ladders will help resolve this crisis. In this letter, we for the first time use 47 gravitational-wave (GW) standard sirens from the third Gravitational-Wave Transient Catalog to calibrate distances in the strong lensing system, RXJ1131-1231, and constrain H0 through the distance-sum rule, with minimal cosmological assumptions. We assume that light propagation over long distances is described by the Friedmann-Lemaitre-Robertson-Walker metric and that geometrical optics holds, but we do not need to assume the universe’s contents or the theory of gravity on cosmological scales. Fixing ΩK = 0, we obtain H0 = 73.22+5−5.9543 km s−1 Mpc−1 and H0 = 70.40+8−5.0360 km s−1 Mpc−1 by using the deflector galaxy’s mass model and kinematic measurements to break mass-sheet transform, respectively. When ΩK is not fixed, the central value of H0 increases further. We find that our results are still dominated by statistical errors, and at the same time, we notice the great potential of using GW dark sirens to provide calibration, owing to their higher redshifts. When using 42 binary black holes and RXJ1131-1231, we obtain a 8.46% H0 constraint precision, which is better than that from the bright siren GW170817 using the Hubble law by about 40%. In the future, as the redshift range of GW dark sirens increases, more and more SGLTDs can be included, and we can achieve high-precision, model-independent measurements of H0 without the need for GW bright sirens. Copyright © 2025, The Authors. All rights reserved.

关键词： Cosmology

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Exploring Source-Free X-ray Prohibited Item Detection with An Assistant-Teacher Network

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Jia, Wanying Jia, Tong Ma, Bowen Huang, Cunhe Tian, Yixin Wang, Hao Chen, Dongyue Northeastern University College of Information Science and Engineering Shenyang110819 China Northeastern University College of Information Science and Engineering Shenyang China Key Laboratory of Data Analysis and Optimization for Smart Industry Ministry of Education Northeastern University China

Security scanners are important for maintaining long-term social stability and safety. However, different security scanners exist endogenous domain shifts. Traditional unsupervised methods require access to the source domain for adaptation during training. But in practical deployment, data privacy restricts access to data between different security scanners. To exploring the this issue, Assistant-Teacher Network (ATN) is proposed to address the endogenous domain shift of X-ray prohibited item detection in the case of source-free domain adaption. In particular, to suppress the problem of false positives and loss of important information in the source-free domain adaption, we propose a common cognitive mechanism. To further prevent the model from optimizing towards the wrong direction under false positive labels, an external ATN loop is designed. In addition, an image de-stylization mechanism is proposed to alleviate the endogenous domain shift, allowing the network to learn the essential features of the X-ray image. By utilizing internal and external loops, ATN can adaptively apply to multiple security scanners in a source-free domain adaptation. The comprehensive experimental results on X-ray images and natural images indicate that our method is effective. Especially in X-ray prohibited item detection, our method has achieved state of the art results compared to recent methods. Our code will be available on https://***/JiaWanying/***. © 1963-2012 IEEE.

关键词： Self-supervised learning

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Robust inference of gravitational wave source parameters in the presence of noise transients using normalizing flows

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Physical Review D 2025年第2期111卷 024019-024019页

作者： Chun-Yu Xiong Tian-Yang Sun Jing-Fei Zhang Xin Zhang Liaoning Key Laboratory of Cosmology and Astrophysics College of Sciences Northeastern University Shenyang 110819 China MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang 110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang 110819 China

Gravitational wave (GW) detection is of paramount importance in fundamental physics and GW astronomy, yet it presents formidable challenges. One significant challenge is the removal of noise transient artifacts known as “glitches,” which greatly impact the search and identification of GWs. Recent research has achieved remarkable results in data denoising, often using effective modeling methods to remove glitches. However, for glitches from uncertain or unknown sources, current methods cannot completely eliminate them from the GW signal. In this work, we leverage the inherent robustness of machine learning to obtain reliable posterior parameter distributions directly from GW data contaminated by glitches. Our network model provides reasonable and rapid parameter inference even in the presence of glitches, without needing to remove them. We also investigate various factors affecting the rationality of parameter inference in our normalizing flow network, including glitch and GW parameters. The results demonstrate that the normalizing flow can reasonably infer the source parameters of GWs even with unknown contamination. We find that the nature of the glitch itself is the only factor that can affect the rationality of the inferred results. With improvements to our model, we anticipate accelerating the localization of electromagnetic counterparts and providing priors for more accurate deglitching, thereby speeding up subsequent data processing procedures.

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Rapid Detection 2-Butanone Gas Sensors based on Biphase In2O3 Nanocubes Modified with Ag NPs and SnO2 QDs at Low Working Temperature

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Guo, Yinghao Yuan, Zhenyu Guo, Zhongming Ran, Mengran Meng, Fanli Northeastern University College of Information Science and Engineering Shenyang110819 China Northeastern University College of Information Science and Engineering State Key Laboratory of Synthetical Automation for Process industries Shenyang110819 China Northeastern University Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Shenyang110819 China Hebei Key Laboratory of MicroNano Precision Optical Sensing and Measurement Technology Qinhuangdao066004 China

Increasing attention has been paid to environmental protection and human health. 2-Butanone is widely applied in industrial and pharmaceutical production causing small-area high-concentration harmful gas and large-area air pollution. The importance of quick and accurate detection is self-evident. In this work, the butanone-sensitive biphase In2O3 nanocubes co-decorated with SnO2 QDs and Ag NPs were prepared through a two-step hydrothermal strategy. Meanwhile, a fantastic detection speed and ultra-high selectivity at lower operating temperatures were experimentally determined. The test results show that the 1 mol% SnO2 QDs and 3 mol% Ag NPs co-decorated In2O3-based sensor have an ultra-fast response speed (4.6 s) and a better response value (119) at the low working temperature (160ºC) to 50 ppm 2-butanone gas. Compared to the previous work, it has significantly improved the cross-selectivity with acetone. With rh-In2O3 being highly defective crystal surfaces and abundant oxygen vacancies, the biphase homojunction plays a key role in decreasing working temperature, for electron flow between two crystalline phase interfaces. The electronic sensitization effect of the Ag element and the quantum effect of SnO2 quantum dots accelerate the detection speed. Moreover, the heterojunction between rh-In2O3 and SnO2 and the Schottky junction between Ag NPs and c-In2O3 largely improve the response capability. The significance of this study is not only to provide a sensor that can accurately detect butanone gas in industrial production and air pollution but also to provide new design ideas for preparing rapid detection semiconductor gas sensors at low working temperatures. The sensor performance in this study indicates that this sensor design scheme can enhance the accuracy and detection speed of butanone sensors used in exhaust gas detection. © 1963-2012 IEEE.

关键词： Air quality

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