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Two-decadal shifts in phytoplankton functional taxa (2002–2022) in response to extreme marine heatwaves

Optics Express 2025年第10期33卷 21961-21978页

作者： Chen, Ronglong Sun, Deyong Wang, Shengqiang Jia, Yongjun Bilal, Muhammad Lang, Shuyan Li, Zhenghao State Key Laboratory of Climate System Prediction Risk Management Nanjing University of Information Science and Technology Nanjing210044 China School of Marine Sciences Nanjing University of Information Science and Technology Nanjing210044 China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources Beijing100081 China National Satellite Ocean Application Service Beijing100081 China Dhahran31261 Saudi Arabia Dhahran31261 Saudi Arabia

Phytoplankton play a crucial role in the primary productivity of ocean ecosystems, rendering changes in their populations particularly consequential. The effects of extreme sea surface temperature (SST) on phytoplankton are noteworthy. However, the direct characterization of total biomass by chlorophyll for analysis is inaccurate for phytoplankton functional taxa (PFTs) with different sensitivity to SST. Through the method of Diagnostic pigment analysis (DPA), these organisms can be classified into six primary functional taxa based on their distinctive pigments, which play a vital role in elucidating their ecological functions and dynamics. This study employed optical remote sensing to reconstruct daily concentrations and occupancy of six PFTs in the Eastern China Marginal Sea (ECMS) over the past 20 years. Causal analyses were conducted to identify regions with varying sensitivity to SST changes and further explore the corresponding impacts on phytoplankton concentrations. Results revealed that high-causality areas in the Bohai Sea (BS) and Yellow Sea (YS) were primarily located in nearshore waters. In contrast, high-causality regions in the East China Sea (ECS) were farther offshore, while nearshore areas exhibited lower causality. The high-causality subregions experienced significant fluctuations in phytoplankton concentrations, particularly during marine heatwave (MHW) events, with a prevailing trend of decline in taxon concentrations driven by elevated SST. In comparison, low-causality subregions displayed weaker synchronization with SST changes, as other factors influenced taxa concentrations more prominently. Notably, while phytoplankton concentrations fluctuated significantly during extreme MHW events, they eventually reverted to baseline levels. However, with the increasing frequency and intensity of MHWs due to global warming, the capacity for phytoplankton to recover under such repeated stress remains uncertain. This study emphasizes the necessity of furt

关键词： Global warming

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A Novel Sample Manipulation Device (SMD) for Lunar Regolith Volatile In-Situ Exploration: Method and Validation

A Novel Sample Manipulation Device (SMD) for Lunar Regolith ...

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2022 IEEE International Conference on robotics and Biomimetics, ROBIO 2022

作者： Tang, Junyue Yang, Tian Chen, Xiren Liu, Ziheng Li, Jiannan Zhang, Zhiheng Xiao, Junxiao Chi, Cheng Jiang, Shengyuan Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin China Nanjing University of Aeronautics and Astronautics China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781665481090

Extraction and analysis of volatile substances in lunar regoilth is an important means to reveal the formation of the Earth-moon system and explore lunar resources. At present, volatile matter loss will be caused by shock vibration and pressure change of returned samples, so volatile matter needs to be prepared in situ on the lunar surface. In order to accurately measure the contents of volatile matter in lunar regoilth, it is necessary to collect samples with constant volume and quantity. In view of the above problems, this paper designed a sample manipulation device for quantitative detection, sample transfer and volatile preparation of lunar regoilth. The device carries 12 sample tubes through the gear disc to realize double station sample transfer. Seal requirements during sample reception and heating are achieved by lifting the rack. The test shows that the device can accurately measure the sample volume, the sample transfer time is 76.67s, and the thrust into the furnace is more than 150N, which meets the requirements of sample processing time and sealing. The device has a certain enlightening effect on the subsequent lunar exploration project. © 2022 IEEE.

关键词： Lunar missions

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A Pilot Study on Fabric-based Pneumatic Soft Gloves for Assisting Patients with Severe Brachial Plexus Injury

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IEEE Transactions on Biomedical Engineering 2025年 PP卷 PP页

作者： Feng, Miao Yang, Dezhi Sun, Jianing Lao, Jie Rui, Jing Gu, Guoying Shanghai Jiao Tong University Robotics Institute State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Key Laboratory of Intelligent Robotics Meta Robotics Institute Shanghai200240 China Southwest Technology and Engineering Research Institute Chongqing400039 China Fudan University Department of Hand Surgery Huashan Hospital China NHC Key Laboratory of Limbs Reconstruction Shanghai Key Laboratory of Peripheral Nerve and Microsurgery Shanghai200040 China

Objective: Robotic gloves show promise in hand assistance due to their wearability and home-based potential, yet empirical research remains limited. This pilot study presents a fabric-based pneumatic soft glove, aiming to identify its potential and challenges in clinical practice by evaluating its effectiveness in assisting patients with severe brachial plexus injury (BPI). Methods: The glove integrates a thumb abduction actuator and four bidirectional fabric-based pneumatic actuators (FPAs) with asymmetric chambers for high output force. Sixteen healthy volunteers and five individuals with BPI, all of whom lacked active hand and wrist movements, were recruited. Participants performed object grasping across 25 cm. The healthy group performed seven tasks using objects weighing up to 2 kg, with muscle activities recorded for analysis. The BPI group further performed tasks with eight objects from the action research arm test (ARAT) and twelve objects for activities of daily living (ADLs), encompassing various sizes, weights, and geometries. Results: In the healthy group, sEMG showed a decrease in 89.3% of trials, with 56.0% of these decreases being significant (p © 1964-2012 IEEE.

关键词： Pneumatic actuators

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Optical processing strategies for micro-imaging small-aperture Wolter mirrors 7

Optical processing strategies for micro-imaging small-apertu...

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7th Global Intelligent Industry Conference, GIIC 2024

作者： Li, Yaran State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

ISBN: (纸本)9781510682986

The Wolter microscope, characterized by its high spatial resolution, large geometric solid angle, and broadband achromatic correction, serves as an ideal initial configuration for the next generation of X-ray imaging diagnostic techniques. Nevertheless, the development of small-aperture Wolter mirrors encounters significant challenges, which primarily hinder their widespread application. This article presents a design approach for micro-imaging small-aperture Wolter microscopes, considering both optical design principles and mirror preparation techniques. It reveals the intricate trade-off relationships among spatial resolution, collection efficiency, and the feasibility of optical processing. By effectively integrating optical principles with manufacturing practices, a staged development roadmap for small-aperture Wolter mirrors is proposed. Through technological convergence, the electroforming nickel preparation process can be gradually mastered. This article provides technical insights that can guide the design and development of high-quality hard X-ray Wolter microscopes. © 2024 SPIE.

关键词： Mirrors

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Anti-Jamming Null Space Projection Beamforming Based on Symbiotic Radio

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Computer Modeling in Engineering & Sciences 2024年第1期138卷 679-689页

作者： Baofeng Ji Yifan Liu Tingpeng Li Ling Xing Weixing Wang Shahid Mumtaz Xiaolong Shang Wanying Liu Congzheng Han State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang471000China Research and Innovation Center of Intelligent System Longmen LaboratoryLuoyang471000China College of Information Engineering Henan University of Science and TechnologyLuoyang471000China Institute of Atmospheric Physics Chinese Academy of Sciences(LAGEO)Beijing100000China Instituto de Telecomunicaes Aveiro3800-005Portugal Chinese Academy of Agricultural Mechanization Sciences Beijing100000China

With the development of information technology,more and more devices are connected to the Internet through wireless communication to complete data *** to the broadcast characteristics ofwireless channels,wireless networks have suffered more and more malicious *** layer security has received extensive attention from industry and *** is considered to be one of the most important technologies related to physical layer *** beamforming technology,messages can be transmitted to legitimate users in an offset direction that is as orthogonal as possible to the interference channel to ensure the reception SINR by legitimate *** the symbiotic radio(SR)technology,this paper considers a symbiotic radio antijamming MIMO system equipped with a multi-antenna system at the main base *** order to avoid the interference signal and improve the SINR of the signal received by the *** base station is equipped with a uniform rectangular antenna array,and using Null Space Projection(NSP)Beamforming,Intelligent Reflecting Surface(IRS)can assist in changing the beam’s *** simulation results show that NSP Beamforming could make a better use of the null space of interference,which can effectively improve the received SINR of users under directional interference,and improve the utilization efficiency of signal energy.

关键词： Symbiotic radio anti-jamming MIMO NSP Beamforming physical layer security

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An analytical method for assessing the initiation and interaction of cracks in fused silica subjected to contact sliding

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Advances in Manufacturing 2023年第3期11卷 363-377页

作者： Chang-Sheng Li Na Zhao Liang-Chi Zhang Jian-Jun Ding Lin Sun Duan-Zhi Duan Cheng-Wei Kang Zhuang-De Jiang State Key Laboratory for Manufacturing Systems Engineering&International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies Xi'an Jiaotong UniversityXi'an 710049People's Republic of China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240People's Republic of China Shenzhen Key Laboratory of Cross-scale Manufacturing Mechanics Southern University of Science and TechnologyShenzhen 518055GuangdongPeople's Republic of China SUSTech Institute for Manufacturing Innovation Southern University of Science and TechnologyShenzhen 518055GuangdongPeople's Republic of China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPeople's Republic of China

Understanding the fracture behavior of fused silica in contact sliding is important to the fabrication of damage-free *** study develops an analytical method to characterize the stress field in fused silica under contact sliding by extending the embedded center of dilation(ECD)model and considering the depth of yield *** effects of densification on the stress fields were considered by scratch volume analysis and finite element *** mechanisms,such as crack initiation and morphology evolution were comprehensively investigated by analyzing the predicted stress fields and principal stress *** predictions were validated by Berkovich scratching *** was found that partial conical,median and lateral cracks could emerge in the loading stage of the contact sliding,but radial and lateral cracks could be initiated during *** was also found that the partial conical crack had the lowest initiation *** intersection of long lateral cracks makes the material removal greater.

关键词： Fused silica Contact sliding Stress field Crack initiation Material removal

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Investigation on the Coexistence of Real-Time DAS system and High-Speed Coherent Optical Signal

Investigation on the Coexistence of Real-Time DAS System and...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Li, Yiqi Shi, Hu Zhao, Yan Zhang, Zhongshu Zhu, Mo Wang, Zhanshan State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen China Wdm System Department of Zte Corporation Wuhan China Wdm System Department of Zte Corporation Beijing China

ISBN: (纸本)9798350312614

The phase optical time-domain reflectometry based on frequency-diversity chirped pulses is demonstrated. The realtime system based on FPGA has realized a sensing distance of over 60km and a spatial resolution of 10m. The coexistence experiment with high-speed coherent optical signals reveals the performance of co-propagation and counter-propagation. © 2023 IEEE.

关键词： distributed fiber optic sensing diversity methods fiber optics communication

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Investigation on method of characteristics and semi-implicit method for pressure linked equations algorithms for water hammer based on unsteady friction

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Journal of Hydrodynamics 2024年第6期36卷 1155-1166页

作者： Zong-ku Liu Guo-hong Wu Hao Wang Jia-xiang Zhang Xue-lin Tang Xiao-qin Li College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China State Key Laboratory of Hydroscience and Engineering and Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China

The misoperation of hydraulic components such as pumps and valves in pressurized pipelines triggers water hammer phenomena and seriously threats the safe operation of hydraulic *** present,the main water hammer simulation methods are method of characteristics(MOC),and further investigation of new algorithms is ***,a new method for simulating the water hammer using the finite volume method(FVM),semi-implicit method for pressure linked equations(SIMPLE)algorithm is proposed in the present *** with the experimental data,the accuracy and reliability of the proposed algorithm are *** show that the IAB,MIAB friction models not only predict the first pressure peak but also accurately predict the pressure *** the comparison of the MOC,SIMPLE algorithms,the results of the two algorithms are almost the same in front of the valve,while near the upstream tank,when using the same friction model,the pressure attenuation predicted by the SIMPLE algorithm is slightly greater than that of the MOC method and closer to the experimental ***,the newly proposed algorithm can serve as an alternative to the MOC method in simulating water *** investigation enriches the numerical methods of hydraulic transients and lays the foundation for subsequent program development.

关键词： Hydraulic transient semi-implicit method for pressure linked equations(SIMPLE)algorithm Navier-Stokes equations finite volume method(FVM)

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A Valuable and Low-Budget Process Scheme of Equivalized 1 nm technology Node Based on 2D Materials

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Nano-Micro Letters 2025年第8期 302-313页

作者： Yang Shen Zhejia Zhang Zhujun Yao Mengge Jin Jintian Gao Yuhan Zhao Wenzhong Bao Yabin Sun He Tian College of Integrated Circuit Science and Engineering Shanghai Key Laboratory of Multidimensional Information ProcessingEast China Normal University State Key Laboratory of ASIC and System School of MicroelectronicsFudan University Institute of Microelectronics and Beijing National Research Center for Information Science and Technology (BNRist) Tsinghua University Shaoxin Laboratory

Emerging two-dimensional（2D） semiconductors are among the most promising materials for ultra-scaled transistors due to their intrinsic atomic-level thickness. As the stacking process advances, the complexity and cost of nanosheet field-effect transistors（NSFETs） and complementary FET（CFET） continue to rise. The 1 nm technology node is going to be based on Si-CFET process according to international roadmap for devices and systems（IRDS）(2022, https://irds. ieee. org/), but not publicly confirmed, indicating that more possibilities still exist. The miniaturization advantage of 2D semiconductors motivates us to explore their potential for reducing process costs while matching the performance of next-generation nodes in terms of area, power consumption and speed. In this study, a comprehensive framework is built. A set of MoS2NSFETs were designed and fabricated to extract the key parameters and performances. And then for benchmarking, the sizes of 2D-NSFET are scaled to a extent that both of the Si-CFET and 2D-NSFET have the same average device footprint. Under these conditions, the frequency of ultra-scaled 2D-NSFET is found to improve by 36% at a fixed power consumption. This work verifies the feasibility of replacing silicon-based CFETs of 1 nm node with 2D-NSFETs and proposes a 2D technology solution for 1 nm nodes, i.e., “2D eq 1 nm” nodes. At the same time, thanks to the lower characteristic length of 2D semiconductors, the miniaturized 2D-NSFET achieves a 28% frequency increase at a fixed power consumption. Further, developing a standard cell library, these devices obtain a similar trend in 16-bit RISC-V CPUs. This work quantifies and highlights the advantages of 2D semiconductors in advanced nodes, offering new possibilities for the application of 2D semiconductors in high-speed and low-power integrated circuits.

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Numerical Investigation of Snow Prevention in the Bogie Region of High-Speed Trains with Active Blowing under Crosswind Conditions

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Fluid Dynamics & Materials Processing 2024年第12期20卷 2789-2808页

作者： Yao Zhang Hong Lan Jiye Zhang Lu Cai Yuzhe Ma State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu610031China College of Railway Transportation Hunan University of TechnologyZhuzhou412000China GD Midea Air-Conditioning Equipment Co. Ltd.Foshan528000China

In this study,the unsteady Reynolds-averaged Navier–Stokes algorithm coupled with the Discrete Phase Model(DPM)was used to study the accumulation of snow in the bogie region of a high-speed train under crosswind ***,the impact of active blowing schemes on the airflow around the bogie and the dynamics and deposition of snow particles were also *** to the results:in the crosswind environment,active blowing changes the flow field in the bogie area,reducing the flow of air coming from the windward side and bottom of the *** trajectory of snow particles carried by crosswinds is modified due to the reduced airflow into the bogie *** no active blowing,snow accumulation is mainly concentrated in the bogie cavity,frame,and primary suspension;while it is reduced by nearly an order of magnitude as soon as blowing is *** speeds need to be distributed appropriately in order to achieve the best possible snow *** increasing the blowing speed on one side does not improve the amount of snow in the bogie *** optimal condition for snow prevention of the entire train is achieved with a windward side blowing speed of 4 m/s and a leeward side blowing speed of 6 m/s,resulting in a snow reduction rate of 95.6%.Moreover,higher blowing speeds on the leeward side are beneficial for mitigating snow accumulation in the bogie region.

关键词： High-speed train active blowing bogie crosswind snow accumulation

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