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ASME 2024 Pressure Vessels and Piping Conference, PVP 2024

作者： Miao, Cunjian Zhong, Haijian Teng, Guoyang Guo, Weican Tang, Ping Hu, Jiansheng Tao, Yangji Zhejiang Academy of Special Equipment Science Hangzhou China Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province Hangzhou China

ISBN: (纸本)9780791888513

On-board 70MPa Type IV hydrogen cylinders predominantly employ an injection-molded plastic liner with a welded design. During the welding sequence, parameters such as temperature, pressure, and duration, coupled with the quality of raw materials, can potentially instigate welding inconsistencies. These aberrations can subsequently compromise the impermeability of the plastic liner. Due to the plastic liner's relatively thin thickness, the significant acoustic attenuation of the material, and the complex nature of defect formations, conventional ultrasonic inspection methods struggle to effectively detect defects within these liners. An ultrasonic phased array automatic detection technique, tailored for the weld seams of Type IV hydrogen cylinder plastic liners, was introduced. By harnessing the capabilities of water wedge technology, it facilitates the deflection of ultrasonic beams and the transition of waveforms. Employing curved elements for intrinsic self-focusing and array elements for electronic focusing, this technique achieves bidirectional acoustic emission fields. Building upon the foundational insights from this acoustic field simulation, the phased array focusing principle, sensor orientation, array element number, pitch, and operational frequency, among other pivotal inspection determinants, were meticulously optimized and calibrated. A phased array multi-path imaging detection method for the liner's weld seam was formulated, and an analysis was undertaken to evaluate the detection efficacy and sensitivity across various defect types. Building on the aforementioned research foundation, a specialized ultrasonic phased array immersion C-scan automatic detection system, specifically designed for the weld seams of the plastic liner, was developed. Test sample of the plastic liner weld seam, integrated with artificial defects, were subjected to testing. The results demonstrated that this method could reliably detect artificial defects in the test sample. Thi

关键词： Acoustic emission testing

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Mobility-LLM: Learning Visiting Intentions and Travel Preferences from Human Mobility Data with Large Language Models 38

Mobility-LLM: Learning Visiting Intentions and Travel Prefer...

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38th Conference on Neural Information Processing Systems, NeurIPS 2024

作者： Gong, Letian Lin, Yan Zhang, Xinyue Lu, Yiwen Han, Xuedi Liu, Yichen Guo, Shengnan Lin, Youfang Wan, Huaiyu School of Computer Science and Technology Beijing Jiaotong University China Beijing Key Laboratory of Traffic Data Analysis and Mining Beijing China Department of Computer Science Aalborg University Denmark

Location-based services (LBS) have accumulated extensive human mobility data on diverse behaviors through check-in sequences. These sequences offer valuable insights into users' intentions and preferences. Yet, existing models analyzing check-in sequences fail to consider the semantics contained in these sequences, which closely reflect human visiting intentions and travel preferences, leading to an incomplete comprehension. Drawing inspiration from the exceptional semantic understanding and contextual information processing capabilities of large language models (LLMs) across various domains, we present Mobility-LLM, a novel framework that leverages LLMs to analyze check-in sequences for multiple tasks. Since LLMs cannot directly interpret check-ins, we reprogram these sequences to help LLMs comprehensively understand the semantics of human visiting intentions and travel preferences. Specifically, we introduce a visiting intention memory network (VIMN) to capture the visiting intentions at each record, along with a shared pool of human travel preference prompts (HTPP) to guide the LLM in understanding users' travel preferences. These components enhance the model's ability to extract and leverage semantic information from human mobility data effectively. Extensive experiments on four benchmark datasets and three downstream tasks demonstrate that our approach significantly outperforms existing models, underscoring the effectiveness of Mobility-LLM in advancing our understanding of human mobility data within LBS contexts. © 2024 Neural information processing systems foundation. All rights reserved.

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Five-user quantum virtual local area network with an AlGaAs entangled photon source

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science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 61-73页

作者： Cheng Qian Hongkai Tian Xu Jing Yichen Liu Zhe Chen Huiran Luo Yuan Du Xiaodong Zheng Tangsheng Chen Yuechan Kong Hua-Lei Yin Dong Jiang Bin Niu Liangliang Lu Key Laboratory of State Manipulation and Advanced Materials in Provincial Universities School of Physical Science and TechnologyNanjing Normal UniversityNanjing210023China School of Internet Anhui UniversityHefei230039China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing Chip Valley Industrial Technology InstituteNanjing Electronic Devices InstituteNanjing210016China Research Center for Quantum Optics and Quantum Communication School of ScienceQingdao University of TechnologyQingdao266520China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education)Renmin University of ChinaBeijing100872China Beijing Academy of Quantum Information Sciences Beijing100193China National Engineering Research Center of Agro-Ecological Big Data Analysis and Application Anhui UniversityHefei230601China National Laboratory of Solid-State Microstructures and School of Physics Nanjing UniversityNanjing210093China Hefei National Laboratory Hefei230088China

The promotion of quantum network applications demands the scalable connection of quantum *** is preferable to set up multiple logical networks coexisting on a single physical network infrastructure to accommodate a larger number of *** we present a quantum virtual network architecture that offers this level of scalability,without being constrained to a fixed physical-layer network relying solely on passive multiplexing *** architecture can be understood as arising from the superposition of a fully connected entanglement distribution network and port-based virtual local area network,which group multiusers by access *** terms of hardware,we leverage a semiconductor chip with a high figure-of-merit modal overlap to directly generate high-quality polarization entanglement,and a streamlined polarization analysis module,which requires only one single-photon detector for each end *** experimentally perform the BBM92 QKD protocol on the five-user quantum virtual network and demonstrate voice and image encryption on a campus area *** results may provide insights into the realization of large-scale quantum networks with integrated and cost-efficient photonic architecture.

关键词： quantum network quantum entanglement distribution integrated photonics image and voice encryption

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Regulating electronic structure of CoN_(4)with axial Co-S for promoting oxygen reduction and Zn-air battery performance

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Nano Research 2023年第4期16卷 4211-4218页

作者： Chang Chen Zhiqiang Chen Junxi Zhong Xin Song Dongfang Chen Shoujie Liu Weng-Chon Cheong Jiazhan Li Xin Tan Chang He Jiaqi Zhang Di Liu Qiuhua Yuan Chen Chen Qing Peng Yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Research and Application for Aerospace Green Propellants Beijing Institute of Aerospace Testing TechnologyBeijing 100048China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China State Key Laboratory of Automtive Safety and Energy Tsinghua UniversityBeijing 100084China Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515031China Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoMacao 999078China

Regulating the coordination environment of transition-metal based materials in the axial direction with heteroatoms has shown great potential in boosting the oxygen reduction reaction(ORR).The coordination configuration and the regulation method are pivotal and ***,we report a combined strategy of matrix-activization and controlled-induction to modify the CoN_(4)site by axial coordination of Co-S(Co1N_(4)-S_(1)),which was validated by the aberration-corrected electron microscopy and X-ray absorption fine structure *** optimal Co1N_(4)-S_(1)exhibits an excellent alkaline ORR activity,according to the half-wave potential(0.897 V *** hydrogen electrode(RHE)),Tafel slope(24.67 mV/dec),and kinetic current ***,the Co1N_(4)-S_(1)based Zn-air battery displays a high power density of 187.55 mW/cm^(2)and an outstanding charge-discharge cycling stability for 160 h,demonstrating the promising application *** calculations indicate that the better regulation of CoN_(4)on electronic structure and thus the highly efficient ORR performance can be achieved by axial Co-S.

关键词： electronic structure regulation axial Co-S coordination single-atom Co oxygen reduction Zn-air battery

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A Golgi-targeted off-on fluorescent probe for visualizing pH change 4

A Golgi-targeted off-on fluorescent probe for visualizing pH...

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4th International Conference on Biomedicine and Bioinformatics Engineering, ICBBE 2024

作者： Li, Zichun Jing, Jing Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Ministry of Industry and Information Technology Key Laboratory of Cluster Science of Ministry of Education Beijing100081 China Key Laboratory of Photo-electronic/Electrophotonic Conversion Materials Analytical and Testing Center School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510682443

As a weakly acidic organelle, the Golgi apparatus plays an important role in cell proliferation, enzyme activity regulation and ions transportation. When the pH of the Golgi apparatus changes, it will affect the normal function of the Golgi apparatus. Herein, a coumarin-based Golgi targeted fluorescent probe (Gol-Cou) is proposed, which shows significant pH dependent fluorescence at 447 nm and a linear relationship in the pH 5.7-7.1 range. The pKa value of Gol-Cou was measured at 6.39. Besides, we successfully applied this probe to visualize the change of Golgi pH during different conditions in HeLa cells. © 2024 SPIE.

关键词： Probes

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A Novel Imaging Method Based on Reweighted Total Variation for an Interferometer Array on Lunar Orbit

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Research in Astronomy and Astrophysics 2023年第12期23卷 204-214页

作者： Xiaocheng Yang Mengna Wang Lin Wu Jingye Yan Junbao Zheng Li Deng School of Computer Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018China Sate Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China National Space Science Center Chinese Academy of SciencesBeijing 100190China

Ground-based radio observations below 30 MHz are susceptible to the ionosphere of the Earth and the radio frequency *** with other space mission concepts,making low frequency observations using an interferometer array on lunar orbit is one of the most feasible ones due to a number of technical and economic *** from traditional interferometer arrays,the interferometer array on lunar orbit faces some complications such as the three-dimensional distribution of baselines and the changing sky blockage by the *** the brute-force method based on the linear mapping relationship between the visibilities and the sky temperature can produce satisfactory results in general,there are still large residual errors on account of the loss of the edge *** obtain the full-sky maps with higher accuracy,in this paper we propose a novel imaging method based on reweighted total variation(RTV)for a lunar orbit interferometer ***,a split Bregman iteration method is introduced to optimize the proposed RTV model so as to decrease the computation *** simulation results show that,compared with the traditional brute-force method,the RTV regularization method can effectively reduce the reconstruction errors and obtain more accurate sky maps,which proves the effectiveness of the proposed method.

关键词： methods data analysis-instrumentation interferometers-techniques interferometric-space vehicles instruments-(cosmology:)dark ages-reionization-first stars

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Failure behaviors of anisotropic shale with a circular cavity subjected to uniaxial compression

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 357-369页

作者： Xianhui Feng Huilin Liu Peitao Wang Shichao Zhang Quanqi Zhu Chun'an Tang Yaxing Leng School of Civil and Resources Engineering University of Science and Technology BeijingBeijing100083China School of Resources and Safety Engineering Central South UniversityChangsha410083China School of Public Safety and Emergency Management Anhui University of Science and TechnologyHuainan232000China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian116024China Institute of Geology Chinese Academy of Geological SciencesBeijing100037China

Layered rock formations are frequently encountered during the excavation of underground structures. The stability of such structures is influenced not only by the stress concentration caused by the cavities in the strata but also by the anisotropy of the layered rock mass. The interaction between them can lead to critical structural failure, such as rupture, collapse, or significant deformation within the adjacent rock mass, thereby jeopardizing operational safety. However, the coupling law and mechanism between the stress concentration resulting from the cavities and the anisotropy of a layered rock mass remain unclear. In this study, a uniaxial compression test was performed on shale specimens containing a circular hole to investigate the effects of layer inclination and circular holes on the mechanical properties, elastic energy storage, and failure behaviors of these specimens. The failure mechanism of the rock surrounding the hole was analyzed on the basis of the single plane of weakness theory and the Kirsch solution. The test results indicated pronounced anisotropy in the compressive strength, elastic modulus, and elastic strain energy of the specimens, with distinct “V”, “M” and “U”-shaped patterns correlated with varying layer inclination angles. In addition, the combined effect of stress concentration and layer inclination resulted in different failure types, which were classified into four groups according to their failure behavior. Theoretical analysis revealed that failure around circular holes in layered rock is affected by a range of variables, such as layer inclination, layer strength, lateral pressure coefficient, azimuth, and loading stress.

关键词： Anisotropy Shale Circular hole Mechanical properties Failure behaviors

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The Low Cycle Fatigue Behavior of a First Generation Single Crystal Superalloy CMSX-6 at 770 °C 9th

The Low Cycle Fatigue Behavior of a First Generation Single ...

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9th International Symposium on Hydrogen Energy, Renewable Energy and Materials, HEREM 2023

作者： Shuai, Zheng Wei, Xu Xueqin, Hou Jian, Zhang Yanfei, Liu Jianwei, Xu Xuanning, Zhang Science and Technology On Advanced High Temperature Structural Materials Laboratory AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation AECC Beijing Institute of Aeronautical Materials Beijing100095 China Aviation Key Laboratory of Science and Technology On Materials Testing and Evaluation Beijing100095 China AECC Sichuan Gas Turbine Establishment Chengdu610500 China

ISBN: (纸本)9789819736850

The investigation of the low cycle fatigue behavior of a first generation single crystal superalloy CMSX-6 were presented. Specimen of CMSX-6 alloy with standard heat treated were test by the fatigue testing machines. The study indicate the low cycle fatigue of CMSX-6 is about 965MPa at 770 °C, R = 0 with a cycle number of 106. Subjected to periodic loads, the dislocation movement in the alloy is restricted to a small part of the crystal plane at the stress concentration area and intensive local slip occurs, resulting in plastic deformation in the local area, and the straight shape of the specimen side became crooked. SEM observation indicate that the fatigue cracks initiate from the internal microporosity of the specimen, and the transient fracture is formed after the crack propagation. The oxidation in crack propagation zone is serious, and the fatigue bands are not visible. Shear dimples were found at the transient fault zone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Single crystals

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Overview of in-situ oxygen production technologies for lunar resources

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng Xu Sheng Pang Liangwei Cong Guoyu Qian Dong Wang Laishi Li Yusheng Wu Zhi Wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

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Influence of magnetic field on power deposition in high magnetic field helicon experiment

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Chinese Physics B 2023年第2期32卷 379-384页

作者：周岩季佩宇李茂洋诸葛兰剑吴雪梅 School of Physical Science and Technology Soochow UniversitySuzhou 215006China Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006China The Key Laboratory of Thin Films of Jiangsu Soochow UniversitySuzhou 215006China School of Optoelectronic Engineering and Technology Soochow UniversitySuzhou 215006China Analysis and Testing Center Soochow UniversitySuzhou 215123China

Based on high magnetic field helicon experiment(HMHX), HELIC code was used to study the effect of different magnetic fields on the power deposition under parabolic distribution. This paper is divided into three parts: preliminary calculation, actual discharge experiment and calculation. The results of preliminary calculation show that a magnetic field that is too small or too large cannot produce a good power deposition effect. When the magnetic field strength is 1200 Gs,a better power deposition can be obtained. The actual discharge experiment illustrates that the change of the magnetic field will have a certain influence on the discharge phenomenon. Finally, the results of verification calculation successfully verify the accuracy of the results of preliminary simulation. The results show that in the actual discharge experiment, it can achieve the best deposition effect when the magnetic field is 1185 Gs.

关键词： high magnetic field helicon experiment(HMHX) HELIC code magnetic field power deposition

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