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Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep

Progress in Natural science:Materials International 2018年第5期28卷 618-625页

作者： Shunke Zhang Sugui Tian Xiaoxia Lv Huichen Yu Ning Tian Zehui Jiao Guoqi Zhao Deyuan Li Guizhou University of Engineering Science Shenyang University of Technology AECC Key Laboratory of Science and Technology on Materials Testing and Evaluation National Key Laboratory of Science and Technology on Advanced High Temperature Structure Materials AECC Beijing Institute of Aeronautical Materials

By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were *** results showed that the microstructure of the alloy consisted of lamellarγ/α2phase,and the boundaries consisted ofγphase located in between lamellarγ/α2phases with different *** the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α2phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive *** deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α*** the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α2phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α2interfaces perpendicular to the stress ***,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C.

关键词： TiAl-Nb alloy Creep Dislocation network Deformation mechanism Fracture mechanism

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The Timing and Polarization of PSR J0002+6216

arXiv

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arXiv 2025年

作者： Wei, Yu Wang, Na Yuan, Jianping Yao, Jumei Ge, Mingyu Dang, Shijun Zhao, De Kou, Feifei Liu, Peng Bai, Juntao School of Physical Science and Technology Xinjiang University Xinjiang Urumqi830046 China Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1-Street Xinjiang Urumqi830011 China Key Laboratory of radio Astronomy Chinese Academy of Sciences Xinjiang Urumqi830011 China Xinjiang Key Laboratory of radio Astrophysics 150 Science1-Street Xinjiang Urumqi830011 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China School of Physics and Electronic Science Guizhou Normal University Guiyang550001 China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal University Guiyang550001 China Department of Astronomy Xiamen University Fujian Xiamen361005 China

The combined timing analysis of data from the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) and the Fermi Large Area Telescope (Fermi-LAT) confirmed that PSR J0002+6216 is not a hyper-velocity (exceeding 1000 km s−1) pulsar. From this analysis, we determined the total proper motion of PSR J0002+6216 to be µtot = 39.05 ± 15.79 mas yr−1, which is consistent with Very Long Baseline Interferometry (VLBI) measurements to within 0.24σ. Moreover, two glitches were detected for the first time, which occurred on MJD 58850(17) and MJD 60421(6), respectively. The second glitch exhibited an exponential recovery process, with Q = 0.0090(3) and τd = 45(3) days. Additionally, with FAST high-sensitivity observations, we measured the interstellar rotation measure (RM) and the three-dimensional (3D) orientation of the spin axis for the first time, and updated the dispersion measure (DM) of PSR J0002+6216. Currently, no variations in RM or DM have been detected. By combining the measured RM with the observed position angle of the spin axis, we determined that the intrinsic position angle of the pulsar’s spin axis is ψ0(intrinsic) = 89◦. 9 ± 4◦. 6. When we compared this with the proper motion position angle obtained from VLBI, we found a misalignment of approximately 23◦ between the spin and velocity angles of PSR J0002+6216. At present, pulsars with 2D spin-velocity angle measurements are unable to fully test the Janka et al. (2022) model. However, with more high-precision observational data in the future, we will be able to further test models related to pulsar birth. Copyright © 2025, The Authors. All rights reserved.

关键词： Interferometry

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Upgrading VFAs bioproduction from waste activated sludge via co-fermentation with soy sauce residue

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Frontiers of Environmental science & Engineering 2019年第1期13卷 53-62页

作者： Yanqing Duan Aijuan Zhou Kaili Wen Zhihong Liu Wenzong Liu Aijie Wang Xiuping Yue College of Environ mental Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Shanxi Engineer Research Institute of Sludge Disposition and Resources Taiyuan University of Technology Taiyuan 030024 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology (SKLUWRE HIT) Harbin 150091 China

Conditioning of extra carbon sources has been widely reported to facilitate fermentation of waste activated sludge (WAS). Soy sauce residue (SSR) was a relatively untapped carbon source for sludge conditioning. This batch study aimed to evaluate the possible implementation of SSR for volatile fatty acids (VFAs) production from WAS. To upgrade the bioavailability of feedstock, three typical pretreatment methods were conducted, i.e., ammonium hydroxide (AH), sulfuric acids (SA) and thermal assisted alkaline (TA). AH pretreated test (AH-PT) outperformed due to a relatively strong structure decomposition of cellulosic materials as revealed by infrared spectroscopic analysis and crystal index. As a result, performed a high hydrolysis rate of 4449 mg COD/d, 1.12-1.23-fold higher than that in TA and SA pretreated tests (TA-PT and SA-PT), and 7.8-fold higher than that in the Control test. Meanwhile, a volatile fatty acids (VFAs) contribution of 401.2 mg COD/g SSR L and a maximum acidification rate of 3.59 d was recorded, with a high sum proportion of mall molecular acetic and propionic 82.2%, 11%-70% increase over the other three tests. Besides, speciation process characterized with functional genus differentiation was identified by microbial diversity and distribution investigation and canonical correspondence analysis (CCA). Finally, a potential market value of 0.49-0.65 Billion €/year was preliminary estimated, showing promise of resource recovery from both WAS and SSR instead of extensive disposal.

关键词： Waste activated sludge (WAS) Soy sauce residue (SSR) Sludge conditioning Volatile fatty acids (VFAs) Microbial diversity

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Virtual external stimulation promotes the transformation of the brain state from early mild cognitive impairment to health

Brain-X

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Brain-X 2023年第4期1卷

作者： Wang, Weiping Wang, Weiwei Zhao, Haiyan Wang, Zhen Luo, Xiong Ouyang, Jipeng School of Computer and Communication Engineering University of Science and Technology Beijing Beijing China Shunde Innovation School University of Science and Technology Beijing Guangdong Shunde China Beijing Key Laboratory of Knowledge Engineering for Materials Science Beijing China Department of Neurology Peking University Third Hospital Beijing China The Center for Optical Imagery Analysis and Learning and School of Mechanical Engineering Northwestern Polytechnical University Shaanxi Xi'an China Department of Neurology Shunde Hospital Southern Medical University Guangdong Shunde China

Neurostimulation has emerged as a potential remedy for early mild cognitive impairment (EMCI). However, further exploration is needed on how external stimulation of brain regions promotes the transition of the brain state from EMCI to health and the selection of target locations. In this study, a functional magnetic resonance imaging dataset was used to evaluate the brain states of healthy individuals and patients with EMCI to explore the probabilistic metastable substate space, identifying abnormal manifestations of EMCI. Stimulation targets were then identified and stimulated to achieve complete controllability of the effective connection network for EMCI. A whole-brain model successfully fitted the brain state of the patients with EMCI based on diffusion tensor imaging data. Based on this whole-brain model, stimulation of the hippocampus, medial frontal gyrus, suboccipital gyrus, and fusiform gyrus can promote the transformation of the brain state from EMCI to health. The findings reveal the underlying brain mechanisms of cognitive decline in patients with EMCI and the stimulation targets of the neural mechanisms of EMCI restoration, which could help in designing more effective therapeutic interventions for EMCI. © 2023 The Authors. Brain-X published by John Wiley & Sons Australia, Ltd on behalf of Ainuohui Medical technology.

关键词： brain state transition computational modeling early mild cognitive impairment exact controllability functional dynamics

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Stacked convolutional sparse auto-encoders for representation learning

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ACM Transactions on Knowledge Discovery from Data 2021年第2期15卷 31-31页

作者： Zhu, Yi Li, Lei Wu, Xindong School of Information Engineering Yangzhou University China School of Computer Science and Information Engineering Hefei University of Technology China Key Laboratory of Knowledge Engineering with Big Data Hefei University of Technology Ministry of Education Hefei China Mininglamp Academy of Sciences Minininglamp Beijing 100084 China

Deep learning seeks to achieve excellent performance for representation learning in image datasets. However, supervised deep learning models such as convolutional neural networks require a large number of labeled image data, which is intractable in applications, while unsupervised deep learning models like stacked denoising auto-encoder cannot employ label information. Meanwhile, the redundancy of image data incurs performance degradation on representation learning for aforementioned models. To address these problems, we propose a semi-supervised deep learning framework called stacked convolutional sparse auto-encoder, which can learn robust and sparse representations from image data with fewer labeled data records. More specifically, the framework is constructed by stacking layers. In each layer, higher layer feature representations are generated by features of lower layers in a convolutional way with kernels learned by a sparse auto-encoder. Meanwhile, to solve the data redundance problem, the algorithm of Reconstruction Independent Component analysis is designed to train on patches for sphering the input data. The label information is encoded using a Softmax Regression model for semi-supervised learning. With this framework, higher level representations are learned by layers mapping from image data. It can boost the performance of the base subsequent classifiers such as support vector machines. Extensive experiments demonstrate the superior classification performance of our framework compared to several state-of-the-art representation learning methods. © 2021 ACM.

关键词： Representation learning Sparse auto-encoder

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Global solution to sensor network localization: A non-convex potential game approach and its distributed implementation

arXiv

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arXiv 2024年

作者： Xu, Gehui Chen, Guanpu Hong, Yiguang Fidan, Baris Parisini, Thomas Johansson, Karl H. Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Beijing100190 China The Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Sweden Digital Futures StockholmSE-10044 Sweden Department of Control Science and Engineering Tongji University Shanghai201804 China Shanghai Research Institute for Intelligent Autonomous Systems Shanghai201210 China The Department of Mechanical and Mechatronics Engineering University of Waterloo WaterlooONN2L 3G1 Canada The Department of Electrical and Electronic Engineering Imperial College London LondonSW7 2AZ United Kingdom The Department of Engineering and Architecture University of Trieste Trieste34127 Italy

Consider a sensor network consisting of both anchor and non-anchor nodes. We address the following sensor network localization (SNL) problem: given the physical locations of anchor nodes and relative measurements among all nodes, determine the locations of all non-anchor nodes. The solution to the SNL problem is challenging due to its inherent non-convexity. In this paper, the problem takes on the form of a multi-player nonconvex potential game in which canonical duality theory is used to define a complementary dual potential function. After showing the Nash equilibrium (NE) correspondent to the SNL solution, we provide a necessary and sufficient condition for a stationary point to coincide with the NE. An algorithm is proposed_ to reach the NE and shown to have convergence rate O(1/√k). With the aim of reducing the information exchange within a network, a distributed algorithm for NE seeking is implemented and its global convergence analysis is provided. Extensive simulations show the validity and effectiveness of the proposed approach to solve the SNL problem. Copyright © 2024, The Authors. All rights reserved.

关键词： Game theory

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Comprehensive analysis and design method of ground heat exchangers under the influence of groundwater seepage

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Renewable Energy 2025年 254卷

作者： Zhang, Xueping Han, Zongwei Bi, Weiqiang Li, Xiuming Shen, Chunming Hebei Province Low-Carbon and Clean Building Heating Technology Innovation Center School of Civil Engineering and Mechanics Yanshan University Qinhuangdao China SEP Key Laboratory of Eco-Industry School of Metallurgy Northeastern University Shenyang China Liaoning Engineering Research Center of Process Industry Energy Saving and Low-carbon Technologies Shenyang China Beijing Academy of Science and Technology Beijing China

Traditional semi-empirical methods are difficult to accurately determine the length of ground heat exchangers (GHEs) in ground source heat pump system, particularly under seepage conditions, which predominantly employ equivalent thermal conduction to approximate the convective heat transfer. This work develops a dynamic model integrating building loads, heat pump units, and pipe groups to simulate annual system operation considering the coupled effects between heat conduction and groundwater advection, and innovatively introduces data-driven modeling to propose an intelligent design method. The optimal length of GHEs under underground parameters is first explored, the sensitivity analysis results indicate that soil thermal conductivity has greatest impact, followed by seepage velocity and then aquifer height. The load characteristic parameters are followed discussed, finding that unlike accumulation parameters and standard deviation, the influence of intensity parameters enhances with increase of seepage strength. When the maximum cooling load increased by 51.26 %, the length increased by 25.93 % and 42.86 % at seepage velocities of 0.05 m/d and 0.50 m/d, respectively. Finally, a database is established by extracting the numerical results, and the length design model is developed using deep neural network to learn from the database. The results show that the design deviation ranged from −6.88 % to 5.76 % across multiple samples. This work can provide a new way for the design method of GHEs. © 2025 Elsevier Ltd

关键词： Design method Ground heat exchangers Ground source heat pump Groundwater seepage Load characteristic

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Adjuvant tamoxifen switched to exemestane treatment in postmenopausal women with estrogen receptor-positive early breast cancer:A pragmatic,multicenter,and prospective clinical trial in China

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Chinese Journal of Cancer Research 2022年第6期34卷 592-600页

作者： Binghe Xu Huiping Li Zefei Jiang Lin Gu Jinhai Tang Hui Xie Yueyin Pan Yunjiang Liu Shude Cui Xiaojia Wang Li Cai Yiqiong Zhang Huadong Zhao Zhimin Shao Department of Medical Oncology National Cancer Center/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of Breast OncologyPeking University Cancer Hospital&InstituteBeijing 100142China Department of Breast Cancer the Fifth Medical Center of Chinese PLA General HospitalBeijing 100071China Department of Breast Cancer Tianjin Cancer Institute and HospitalTianjin 300060China Department of Breast Cancer Jiangsu Provincial HospitalNanjing 210029China Department of Breast Cancer the First Affliated Hospital of China University of Science and TechnologyHefei 230001China Department of Breast Cancer the Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011China Department of Breast Cancer Henan Cancer HospitalZhengzhou 450008China Department of Breast Cancer Zhejiang Cancer HospitalHangzhou 310012China Department of Breast Cancer Harbin Medical University Cancer HospitalHarbin 150081China Department of Clinical Development Pfizer(China)R&D Co.LtdShanghai 201203China Department of Statistics Pfizer(China)R&D Co.LtdShanghai 201203China Department of Breast Surgery Shanghai Cancer Center/Cancer InstituteShanghai Medical CollegeFudan UniversityShanghai 200032China

Objective:This post-approval safety study assessed the efficacy and safety of exemestane after 2-3 years of tamoxifen treatment among postmenopausal women with estrogen receptor-positive(ER+)early breast cancer in ***:Enrolled patients had received 2-3 years of tamoxifen and were then switched to exemestane for completion of 5 consecutive years of adjuvant endocrine *** primary endpoint was the time from enrollment to the first occurrence of locoregional/distant recurrence of the primary breast cancer,appearance of a second primary or contralateral breast cancer,or death due to any *** endpoints included the proportion of patients experiencing each event,incidence rate per annum,relationships between human epidermal growth factor receptor 2 status and time to event,and relationship between disease history variables and time to ***:Overall,558 patients were included in the full analysis set:397(71.1%)completed the study,20experienced an event,and 141 discontinued[47 owing to an adverse event(AE);37 no longer willing to participate].Median duration of treatment was 29.5(range,0.1-57.7)*** time to event was not *** survival probability at 36 months was 91.4%(95%CI,87.7%-95.1%).The event incidence over the total exposure time of exemestane therapy was 3.5 events/100 person-years(20/565).Multivariate analysis showed an association between tumor,lymph node,and metastasis stage at initial diagnosis and time to event[hazard ratio:1.532(95%CI,1.129-2.080);P=0.006].Most AEs were grade 1 or 2 in severity,with arthralgia(7.7%)being the most common treatment-related ***:This study supports the efficacy and safety of exemestane in postmenopausal Chinese women with ER+breast cancer previously treated with adjuvant tamoxifen for 2-3 *** new safety signals were identified in the Chinese population.

关键词： Chinese early breast cancer exemestane tamoxifen postmenopausal women estrogen receptor-positive

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High-Precision Physics Experiments at Huizhou Large-Scale Scientific Facilities

arXiv

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arXiv 2025年

作者： An, FengPeng Bai, Dong Chen, Siyuan Chen, Xurong Duyang, Hongyue Gao, Leyun Ge, Shao-Feng He, Jun Huang, Junting Huang, Zhongkui Ivanov, Igor Ji, Chen Jia, Huan Jiang, Junjie Kim, Soo-Bong Kong, Chui-Fan Kou, Wei Li, Qiang Li, Qite Liao, Jiajun Ling, Jiajie Liu, Cheng-En Ma, Xinwen Qiu, Hao Tang, Jian Wang, Rong Wen, Weiqiang Wu, Jia-Jun Xiao, Jun Xiao, Xiang Xu, Yu Yang, Weihua Yang, Xiaofei Yao, Jiangming Yuan, Ye Zaiba, Mushtaq Zhang, Pengming Zhang, Shaofeng Zhang, Shuo Zhao, Shihan Zou, Liping School of Physics Sun Yat-sen University Guangzhou510275 China College of Mechanics and Engineering Science Hohai University Nanjing211100 China Platform for Muon Science and Technology Sun Yat-sen University Guangzhou510275 China State Key Laboratory of Heavy Ion Science and Technology Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China Southern Center for Nuclear Science Theory Institute of Modern Physics Chinese Academy of Sciences Huizhou516000 China Shandong University Jinan China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong University Qingdao266237 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China State Key Laboratory of Dark Matter Physics Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University Shanghai200240 China School of Physics and Technology Nanjing Normal University Nanjing210097 China School of Physics and Astronomy Shanghai Jiao Tong University China University of Chinese Academy of Sciences Beijing100049 China School of Physics and Astronomy Sun Yat-sen University Zhuhai519082 China Institute of Particle Physics Central China Normal University Wuhan430079 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Institute of Modern Physics Fudan University Shanghai200433 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou516000 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China College of Nuclear Equipment and Nuclear Engineering Yantai University Shandong Yantai264005 China Institute of High Energy Physics Chinese Academy of Sciences Beijin

In response to the capabilities presented by the High-Intensity Heavy Ion Accelerator Facility (HIAF) and the Accelerator-Driven Subcritical System (CiADS), as well as the proposed Chinese Advanced Nuclear Physics Research Facility (CNUF), we are assembling a consortium of experts in relevant disciplines—both domestically and internationally—to delineate high-precision physics experiments that leverage the state-of-the-art research environment afforded by CNUF. Our focus encompasses six primary domains of inquiry: hadron physics—including endeavors such as the super eta factory and investigations into light hadron structures;muon physics;neutrino physics;neutron physics;the testing of fundamental symmetries;and the exploration of quantum effects within nuclear physics, along with the utilization of vortex accelerators. We aim to foster a well-rounded portfolio of large, medium, and small-scale projects, thus unlocking new scientific avenues and optimizing the potential of the Huizhou large scientific facility. The aspiration for international leadership in scientific research will be a guiding principle in our strategic planning. This initiative will serve as a foundational reference for the Institute of Modern Physics in its strategic planning and goal-setting, ensuring alignment with its developmental objectives while striving to secure a competitive edge in technological advancement. Our ambition is to engage in substantive research within these realms of high-precision physics, to pursue groundbreaking discoveries, and to stimulate progress in China’s nuclear physics landscape, positioning Huizhou as a preeminent global hub for advanced nuclear physics research. © 2025, CC BY.

关键词： Hadrons

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Structural and superconducting properties in hard Mo 2 BC

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International Journal of Refractory Metals and Hard Materials 2024年 123卷

作者： Yufei Ge Chao Zhou Ningning Wang Xin Li Shuailing Ma Qiang Tao Pinwen Zhu Kuo Bao Tian Cui Synergetic Extreme Condition High-Pressure Science Center State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo 315211 China

The utilization of high-hardness superconducting materials enhances and broadens the applications of superconductors. In this study, a high-hardness Mo 2 BC superconductor is synthesized using the high-pressure and high-temperature (HPHT) method. Our results demonstrate that it exhibits zero-resistance and Meissner effect below a superconducting critical temperature ( T c ) of 7.0 K. The upper critical magnetic field of 4.3 T and the lower critical magnetic field of 226 Oe were obtained by data fitting, respectively. Type-II superconducting properties were confirmed by critical states analysis and Ginzburg-Landau (GL) parameters. Specific thermal properties revealed a Debye temperature as 565.1 K, while an electron-phonon coupling (EPC) parameter λ of 0.588 indicated properly coupled BCS conventional superconductivity. Mo 2 BC exhibits a Vickers hardness of up to 18.2 GPa, significantly surpassing that of traditional superconducting ceramics. It can be attributed to the robust covalent boron-zigzag-chains coupled with appropriate covalent [Mo 6 C] octahedrons within a non-centrosymmetric structure. The coexistence of both superconductivity and high hardness enables the versatility of Mo 2 BC, thereby laying the way for the development of high-hardness superconductors.

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