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Few-shot source range estimation based on acoustic arrival structures in deep sea

Applied Acoustics 2025年 239卷

作者： Qianqian Li Qi Li Zhenglin Li Jixing Qin School of Ocean Engineering and Technology Sun Yat-sen University Zhuhai 510275 China College of Geomatics Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Acoustics and Marine Information Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China

Theoretical analysis indicates that variations in source range cause significant differences in acoustic arrival structures in the depth-time domain. Therefore, this paper proposes for the first time to use the arrival structure of the acoustic field as input features and to employ a two-dimensional convolutional neural network (2D-CNN) for underwater acoustic source localization from an image recognition perspective. To address the source range estimation with limited observed data, a transfer learning model is constructed. Based on pre-training with simulated data generated by the acoustic propagation model, the model is further trained on small-sample observed acoustic data from the detection area. Through sensitivity analysis, the impact of mismatched environmental parameters on source localization is investigated. Simulation results demonstrate that the proposed method exhibits superior performance and stronger robustness compared to traditional matched-field processing. Experimental results from the South China Sea show that the localization performance is much better compared to the conventional matched field processing (MFP) and the 2D-CNN method. For range predictions, the mean absolute percentage error (MAPE) is less than 5 % for the source up to 30 km.

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Visible light-driven S-scheme ZnS/OVs-BiOCl heterojunctions for CO 2 reduction and pollutants degradation

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Solid State Sciences 2025年 167卷

作者： Penghui Yang Quanhao Liu Siwen Ma Song Luo Wangsheng Qumu Junbo Zhong Dongmei Ma Jiufu Chen Key Laboratory of Green Catalysis of Higher Education Institutes of Sichuan College of Chemistry and Environmental Engineering Sichuan University of Science and Engineering Zigong 643000 China Key Laboratory of Chemical Synthesis and Pollution Control in Sichuan Province China West Normal University Nanchong 637009 Sichuan China Key Laboratory of Low-Cost Rural Environmental Treatment Technology at Sichuan University of Arts and Science Education Department of Sichuan Province Sichuan University of Arts and Science Dazhou 635000 Sichuan China

Construction of heterojunctions and introduction of oxygen vacancies (OVs) are effective approaches to enhance photocatalytic performance of BiOCl. In this study, S-scheme ZnS/OVs-BiOCl heterojunctions was prepared. The presence of ZnS influences the crystal growth of BiOCl and promotes the formation of OVs. Ultraviolet photoelectron spectroscopy (UPS) was employed to investigate the work functions of BiOCl and ZnS, providing insights into the electron transfer mechanisms. In-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) reveals the dynamic process of CO 2 conversion to CO. Electron paramagnetic resonance (EPR) spectroscopy was employed to investigate the active radicals involved in the photocatalytic degradation process. The synergistic effect of the internal electric field (IEF) and OVs enhances the separation of photoinduced charges and light absorption capability of BiOCl. Under visible light irradiation, the rate of CO 2 conversion to CO on the BOC-7 sample (the mass ratio of ZnS/BiOCl is 7 %) is 2.53 times of that on the reference BiOCl. Furthermore, versatility of the photocatalyst was investigated by examining photocatalytic degradation of Rhodamine B (RhB), Ciprofloxacin (CIP) and Moxifloxacin (MXF) on the photocatalyst under visible light illumination. Under visible light irradiation, the degradation rate constant of RhB, CIP and MXF on the BOC-7 sample is 6.08, 2.49, and 3.67 times of that over the reference BiOCl, respectively. This study provides a rational strategy for the development of high-performance BiOCl photocatalysts for environmental remediation.

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Thermodynamic properties of alkalis borates

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2013 3rd International Symposium on Chemical engineering and Material Properties, ISCEMP 2013

作者： Zhang, Si Si Lin, Chen Xiao Guo, Ya Fei Wang, Shi Qiang Deng, Tian Long Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China

In the paper, the progresses on the thermodynamic properties of several alkalis borates including lithium borates, sodium borates, potassium borates, rubidium borates and cesium borates at present were summarized, and... 详细信息

ISBN: (纸本)9783037858363

关键词： Potassium compounds

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Phase chemistry and thermal chemistry on the calcium-containing brine systems

Phase chemistry and thermal chemistry on the calcium-contain...

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4th International Symposium on Chemical engineering and Material Properties, ISCEMP 2014

作者： Bu, Bai Hui Li, Fei Guo, Ya Fei Wang, Shi Qiang Deng, Tian Long Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China

ISBN: (纸本)9783038352303

It is well known that phase equilibria and phase diagrams can successfully guide the comprehensive utilization of the salt lake resources. The researches on phase chemistry and thermal chemistry of the calcium-containing brine system are essential to promote the development of brines. In this paper, the progresses on the phase chemistry and thermal chemistry of the calcium-containing brine system around the world from 2007 up to now were summarized. The problems existed and the new trends in the future were also carried out. © (2014) Trans Tech Publications, Switzerland.

关键词： Calcium

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In-situ synthesis,microstructure,and properties of NbB_(2)-NbC-Al_(2)O_(3)composite coatings by plasma spraying

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Journal of Advanced Ceramics 2022年第8期11卷 1263-1278页

作者： Xiaolong WANG Yong YANG Shitong JIA Yanwei WANG Yuduo MA Yuhang CUI Xingyu WANG Wenwei SUN Liang WANG Key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300401China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

The high melting point and strong chemical bonding of NbB_(2)pose a great challenge to the preparation of high-density nanostructured NbB_(2)composite ***,we report a novel,simple,and efficient method to fabricate in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating by plasma spraying Nb_(2)O_(5)–B_(4)C–Al composite powder,aiming at realizing the higher densification and ultra-fine microstructure of NbB_(2)composite *** microstructure and properties of in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating were studied comparatively with ex-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating(plasma spraying NbB_(2)–NbC–Al_(2)O_(3)composite powder).The reaction mechanism of Nb_(2)O_(5)–B_(4)C–Al composite powder in plasma jet was analyzed in *** results showed that the in-situ nanostructured NbB_(2)–NbC–Al_(2)O_(3)composite coating presented a lower porosity and superior performance including higher microhardness,toughness and wear resistance compared to the plasma sprayed ex-situ NbB_(2)–NbC–Al_(2)O_(3)coating and other boride composite *** of the in-situ NbB_(2)–NbC–Al_(2)O_(3)coating was attributed to the low melting point of Nb_(2)O_(5)–B_(4)C–Al composite powder and the exothermic effect of in-situ *** superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized *** in-situ reaction path could be expressed as:Nb_(2)O_(5)+Al®Nb+Al_(2)O_(3),and Nb+B_(4)C®NbB_(2)+NbC.

关键词： NbB_(2)-NbC-Al_(2)O_(3)composite coating plasma spray in-situ synthesis Nb_(2)O_(5)-B_(4)C-Al system

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Advancing the thrust-to-power ratio of the liquid metal micro-cathode arc thruster: the effect of the different cathode material

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Journal of Physics D: Applied Physics 2025年第24期58卷 245201-245201页

作者： Tiance Liang Haochen Ma Liqiu Wei Jian Zhang He Zheng Chao Sun Tianyuan Ji Liwei Zhou School of Energy Science and Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 People’s Republic of China Key Laboratory of Aerospace Plasma Propulsion Ministry of Industry and Information Technology Harbin 150001 People’s Republic of China State Key Laboratory of Space Environment Interaction with Matters Harbin Institute of Technology Harbin Heilongjiang People’s Republic of China Beijing Institute of Control Engineering China Aerospace Science and Technology Corporation Beijing 100089 People’s Republic of China

The liquid material micro-cathode arc thruster (LM-μCAT) is a type of micro-cathode arc thruster (μCAT) with liquid cathode at room temperature. It can feed a number of cathode materials theoretically in a single space mission. The performance differences of LM-μCAT with different cathode materials are compared in this study. The material is a mixture of gallium (Ga) with either aluminum particles (Ga–Al cathode) or titanium particles (Ga–Ti cathode). Results show that the particle size has no effect on the LM-μCAT. The thrust-to-power ratio of Ga–Ti cathode LM-μCAT ranges from 0.32 μN/W to 1.60 μN/W, whereas that of Ga–Al cathode LM-μCAT ranges from 0.42 μN/W to 2.04 μN/W, which increases by about 34%. The discharge process is divided into three stages: high arc current stage, low current stage, ablation anode stage. Differences in the thrust-to-power ratio are attributed to the high arc current stage and ablation anode stage. At the high arc current stage, the peak thrust of the Ga–Al cathode LM-μCAT can reach 1.75 mN and that of Ga–Ti cathode LM-μCAT is 0.5mN. Since the plasma generated by the Ga–Al cathode LM-μCAT has higher energy, it can lead to higher thrust than Ga–Ti cathode LM-μCAT. At the low current stage, the peak thrust of the Ga–Al cathode LM-μCAT can reach 2.25 mN and that of Ga–Ti cathode LM-μCAT is 0.6 mN. The differences are minimal. In the ablation anode stage, the plasma generated by the Ga–Al cathode LM-μCAT is more than the Ga–Ti cathode LM-μCAT but they have similar ion rates.

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UUV formation system modeling and simulation research based on Multi-Agent Interaction Chain

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第2期6卷 132-154页

作者： Hongtao Liang Fengju Kang Honghong Li College of Marine Engineering Northwestern Polytechnical University Xi’an 710072 P.R.China National Key Laboratory of Underwater Information Process and Control Xi’an 710072 P.R.China

Unmanned Underwater Vehicle(UUV)formation system has an important role in the utilization of marine *** order to provide an efficient method to research modeling and simulation of UUV formation in the marine environment,the novel approach based on Multi-Agent Interaction Chain was proposed for the UUV formation ***,Multi-Agent Interaction Chain was analyzed,which mainly considered task and role of UUV in the formation,and the overall modeling process of UUV formation system based on Multi-Agent Interaction Chain was ***,the static structure of Multi-Agent Interaction Chain was researched focusing on Hybrid UUV-Agent model structure from the UUV-Agent State-Set and UUV-Agent Rule-Base which were the two aspects to strengthen reliability of interaction chain;the dynamic mechanism of Multi-Agent Interaction Chain was designed,which was focused on collaboration model and communication model through the Adaptive Dynamic Contract Net Protocol and KQML/XML/***,three experiments were established to verify the validity and effectiveness of proposed modeling approach for UUV formation *** results show the proposed model has good performance,which has important theoretical innovation and application prospects.

关键词： UUV formation system Multi-Agent Interaction chain static structure dynamic mechanism

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Pretreatment techniques for arsenic speciation analysis in biosamples

Pretreatment techniques for arsenic speciation analysis in b...

引用

4th International Symposium on Chemical engineering and Material Properties, ISCEMP 2014

作者： Guo, Jin Ling Yu, Xiao Ping Guo, Ya Fei Deng, Tian Long Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China

ISBN: (纸本)9783038352303

Sample pretreatment techniques for arsenic speciation analysis in biosamples are of significant importance in detection procedures. In this paper, several typical pretreatment techniques such as solvent extraction (SE), enzymatic hydrolysis (EH), pressurized liquid extraction (PLE), solid phase microextraction (SPME) and liquid phase microextraction (LPME) were summarized on the basis of 20 references. The new trend in the future was also carried out. © (2014) Trans Tech Publications, Switzerland.

关键词： Arsenic

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Research on Intelligent Collaborative Perception of Space Non-cooperative Targets Based on AOCS Platform 1

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7th Chinese Conference on Swarm Intelligence and Cooperative control, CCSICC 2023

作者： Du, Hang Hu, Haixia Zhang, Haibo Beijing Institute of Control Engineering Beijing China National Key Laboratory of Science and Technology On Space Intelligent Control Beijing China

ISBN: (数字)9789819733323

ISBN: (纸本)9789819733316

This article provides a detailed introduction to the space non-cooperative targets intelligent collaborative perception module, whose main function is to improve the system’s understanding of the target and task environment through recognition, judgment, learning, and other processes, based on the target model containing multidimensional information obtained from target reconstruction, as well as data resources such as target model characteristic test data and target feature digital volume library. Module includes a space target feature dataset, a space target intelligent cooperative perception algorithm interaction environment, space target model feature clustering and recognition software, space target model matching and situation association software, space target position and attitude measurement software, and a parallel computing module. The dataset is used to train the space target model feature clustering and recognition software to obtain the model parameters of the recognition algorithm, which is used for the recognition of space target identity information and local feature information;the space target model matching and situation association software further associates the recognition information of the local features of the space target. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Association reactions

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Studies on the key parameters in segmental lining design

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Journal of Rock Mechanics and Geotechnical engineering 2015年第6期7卷 674-683页

作者： Zhenchang Guan Tao Deng Gang Wang Yujing Jiang College of Civil Engineering Fuzhou University State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and Technology Department of Civil Engineering Nagasaki University

The uniform ring model and the shell-spring model for segmental lining design are reviewed in thisarticle. The former is the most promising means to reflect the real behavior of segmental lining, while thelatter is the most popular means in practice due to its simplicity. To understand the relationship and thedifference between these two models, both of them are applied to the engineering practice of FuzhouMetro Line I, where the key parameters used in both models are described and compared. The effectiveratio of bending rigidity h reflecting the relative stiffness between segmental lining and surroundingground and the transfer ratio of bending moment x reflecting the relative stiffness between segment andjoint, which are two key parameters used in the uniform ring model, are especially emphasized. Thereasonable values for these two key parameters are calibrated by comparing the bending momentscalculated from both two models. Through case studies, it is concluded that the effective ratio of bendingrigidity h increases significantly with good soil properties, increases slightly with increasing overburden,and decreases slightly with increasing water head. Meanwhile, the transfer ratio of bending moment xseems to only relate to the properties of segmental lining itself and has a minor relation with the groundconditions. These results could facilitate the design practice for Fuzhou Metro Line I, and could alsoprovide some references to other projects with respect to similar scenarios.

关键词： Segmental lining Uniform ring model Shell-spring model Effective ratio of bending rigidity Transfer ratio of bending moment

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