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中国科学:技术科学（英文版）
中国科学:技术科学（英文版）

周光召

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中国科学:技术科学（英文版）/Journal Science China Technological SciencesCSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Photoelectrocatalytic hydrogen evolution and synchronous degradation of organic pollutants by pg-C3N4/β-FeOOH S-scheme heterojunction

    LI XiBaoHAN TaoZHOU YingTangXIE Yu...
    1238-1252页
    查看更多>>摘要：Crafting photoelectrocatalytic materials with robust oxidation-reduction properties for simultaneous hydrogen evolution and pollutant degradation poses a formidable challenge.In this study,a pg-C3N4/β-FeOOH S-scheme heterostructure with a special energy band structure was developed by anchoring porous pg-C3N4 on needle shaped β-FeOOH.Functioning as a hole extraction layer,needle-leaf-like β-FeOOH can facilitate efficient hole migration and enhance charge transport.Remarkably,the optimized 0.2-pg-C3N4/β-FeOOH could degrade 78％of ofloxacin(OFLO)in 90 min.The organic pollutants could absorb a large number of holes,which prompted a greater proportion of photogenerated electrons to actively participate in the hydrogen evolution reaction at the cathode.Consequently,the hydrogen production of 0.2-pg-C3N4/β-FeOOH reached 1452.88 μmol cm-2 h-1,exhibiting a notable increase of 61.81-165.12 μmol cm-2 h-1 compared with that in the absence of pollutants.Experimental and theoretical calculation results underscore that this investigation is grounded in a distinctive electron and hole dual channel transfer mechanism.These findings offer novel insights for the future development of S-scheme heterojunction photoelec-trocatalytic materials capable of concurrently degrading pollutants and promoting hydrogen evolution.
      原文链接:
    • 万方数据

    A novel predictive braking energy recovery strategy for electric vehicles considering motor thermal protection

    YANG ChaoSUN TongLinYANG LiuQuanZHANG YuHang...
    1253-1269页
    查看更多>>摘要：Braking energy recovery(BER)aims to recover the vehicle's kinetic energy by coordinating the motor and mechanical braking torque to extend the driving range of the electric vehicle(EV).To achieve this goal,the motor/generator mode requires frequent switching and prolonged operation during driving.In this case,the motor temperature will unavoidably rise,potentially triggering motor thermal protection(MTP).Activating MTP increases the risk of motor component failure,and the EV typically disables the BER function.Thus,maximizing BER while reducing the risk of motor overheating is a challenging problem.To address this issue,this article proposes a predictive BER strategy with MTP using the non-smooth Pontryagin Minimum Principle(NSPMP)for EVs.Firstly,a Markov long short-term memory(MLSTM)model is designed to obtain future velocity information.Secondly,the BER problem with MTP in the studied EV is embedded in a model predictive control(MPC)framework.Then,under the MPC framework,the NSPMP strategy is proposed to resolve the problem of MTP.Finally,the performance of the proposed strategy is verified through simulation and a hardware-in-loop test.The results show that in two real-world driving cycles,compared to the rule-based strategy,the proposed strategy reduced power consumption by 1.24％and 0.96％,respectively,and effectively limited motor temperature.Additionally,under global cycle conditions,this strategy demonstrated better MTP control performance compared to other benchmark strategies.
      原文链接:
    • 万方数据
    • 维普

    Multispectral point cloud superpoint segmentation

    WANG QingWangWANG MingYeZHANG ZiFengSONG Jian...
    1270-1281页
    查看更多>>摘要：The multitude of airborne point clouds limits the point cloud processing efficiency.Superpoints are grouped based on similar points,which can effectively alleviate the demand for computing resources and improve processing efficiency.However,existing superpoint segmentation methods focus only on local geometric structures,resulting in inconsistent spectral features of points within a superpoint.Such feature inconsistencies degrade the performance of subsequent tasks.Thus,this study proposes a novel Superpoint Segmentation method that jointly utilizes spatial Geometric and Spectral Information for multispectral point cloud superpoint segmentation(GSI-SS).Specifically,a similarity metric that combines spatial geometry and spectral in-formation is proposed to facilitate the consistency of geometric structures and object attributes within segmented superpoints.Following the formation of the primary superpoints,an intersuperpoint pointexchange mechanism that maximizes feature consistency within the final superpoints is proposed.Experiments are conducted on two real multispectral point cloud datasets,and the proposed method achieved higher recall,precision,F score,and lower global consistency and feature classification errors.The experimental results demonstrate the superiority of the proposed GSI-SS over several state-of-the-art methods.
      原文链接:
    • 万方数据
    • 维普

    Flexible multilayer MEMS coils and their application in energy harvesters

    ZHANG JieHOU XiaoJuanQIAN ShuoBI XiaoXue...
    1282-1293页
    查看更多>>摘要：Electromagnetic vibration energy harvesters are promising for the power supply of wireless sensor nodes,small electronic devices,and wearable electronics.Conventional electromagnetic harvesters usually increase output by increasing the size of coils and magnets,limiting the improvement of energy conversion efficiency and power density.In this study,multilayer microelectromechanical system(MEMS)coils were prepared using flexible electronics,and their high integration performance in arbitrary space was utilized to greatly improve the utilization of the space magnetic field by the electromagnetic harvester.The core magnet of the generator was magnetically balanced to achieve levitation,which improved the sensitivity and reduced fatigue damage compared with traditional spring structures.The wound coils on the top and bottom of the magnet and the flexible coils on the sides worked together to improve the energy effiiciency and output of the devices.The output performance of the device with different number distributions was simulated using mathematical models to obtain the optimal structural parameters.The results show that by introducing flexible multilayer MEMS coils on the side surface of the energy harvester,the open-circuit voltage of the energy generators increased from 7 to 10 V by more than 43％.Flexible multilayer MEMS coils can enhance energy conversion rates and possess compact dimensions,making them suitable for integration onto complex surfaces.After the vibration energy harvesting system testing,the maximum peak power of the harvester was 7.1 mW at an acceleration of 1 g and a resonant frequency of 11 Hz with a resistor of 3.5 kΩ internal resistance.Moreover,a 470 μF capacitor can be charged to 3.5 V within 10 s to drive a hygrothermograph to work for more than 80 s and can supply a light bulb continuously.This strategy shows the great potential of vibration-energy-driven electromagnetic generators for powering small electronics in limited spaces.
      原文链接:
    • 万方数据
    • 维普

    New technology for pipeline defect detection

    NIU YanXiaSUN LongXiangWANG YiXuanSHEN GuoLang...
    1294-1296页
      原文链接:
    • 万方数据
    • 维普