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Journal of Pharmaceutical Analysis 2022年第3期12卷 453-459页

作者： Guangjun Feng yang yang Jiantao Zeng Jun Zhu Jingjian liu Lun Wu Zhiming yang Guanyi yang Quanxi Mei Qinhua Chen Fengying Ran Shenzhen Baoan Authentic TCM Therapy Hospital Shenzhen518101China Sinopharm Dongfeng General Hospital Hubei University of MedicineShiyanHubei442008China Shenzhen Hospital of Integrated Traditional Chinese and Western Medicine Shenzhen518101China

Rutin,a flavonoid found in fruits and vegetables,is a potential anticancer compound with strong anticancer ***,electrochemical sensor was developed for the detection of *** this study,CoWO_(4) nanosheets were synthesized via a hydrothermal method,and porous carbon(PC)was prepared via high-temperature *** preparation of the materials was confirmed,and characterization was performed by transmission electron microscopy,scanning electron microscopy,and X-ray photoelectron spectroscopy.A mixture of PC and CoWO_(4) nanosheets was used as an electrode modifier to fabricate the electrochemical sensor for the electrochemical determination of *** 3D CoWO_(4) nanosheets exhibited high electrocatalytic activity and good *** has a high surface-to-volume ratio and superior ***,the hydrophobicity of PC allows large amounts of rutin to be adsorbed,thereby increasing the concentration of rutin at the electrode *** to the synergistic effect of the 3D CoWO_(4) nanosheets and PC,the developed electrochemical sensor was employed to quantitively determine rutin with high stability and *** sensor showed a good linear range(5-5000 ng/mL)with a detection limit of 0.45 ng/*** developed sensor was successfully applied to the determination of rutin in crushed tablets and human serum samples.

关键词： Rutin Electrochemical detection CoWO_(4)nanosheets Porous carbon Sensor

Adaptive feedback control of stability in an axial compressor with circumferential inlet distortion

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Chinese Journal of Aeronautics 2023年第5期36卷 187-201页

作者： Juan DU yang liu Jichao LI Wenqiang ZHANG Hongwu ZHANG chaoqun NIE Advanced Gas Turbine Laboratory Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Mechanical and Electrical Engineering Beijing Institute of TechnologyBeijing 100081China

The adaptive feedback control of stability with circumferential inlet distortion has been experimentally investigated in a low-speed,axial *** flat-baffles with different span heights are used to simulate different distorted inflow *** with auto-correlation and root-mean-square analysis,cross-correlation analysis used to predict early stall warning does not depend on the distortion ***,the cross-correlation coefficient was used to monitor the stable status of the compressor and provide the feedback signal in the active control strategy when suffering from different *** on the stall margin improvement of tip air injection obtained under different distorted inflow cases and the sensitivity analysis of cross-correlation coefficients to injected momentum ratios,tip air injection was adopted as the actuator for adaptive feedback *** digital signal processing controller was designed and applied to achieve adaptive feedback control in distorted inflow *** results show that the adaptive feedback control of air injection nearly achieves the same stall margin improvement as steady air injection under different distortion intensities with a reduced injection mass ***,the proposed adaptive feedback control method is ideal for the engine operation with circumferential distorted inflow,which frequently occurs in flight.

关键词： Circumferential inlet distortion Cross-correlation Digital signal processing controller Stability control Tip air injection Tip leakage flow

Adsorption properties of environmentally friendly insulating medium C_(4)F_(7)N and its common decomposition products in NaA,NaZSM-5,and NaX molecular sieves

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High Voltage 2023年第3期8卷 611-621页

作者： Shuangshuang Tian Zian Yuan Xiaoxing Zhang Yingxiang Wang Weifeng Luo yang liu Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of TechnologyWuhanChina Xiangyang Industrial Institute of Hubei University of Technology WuhanChina State Grid HBEPC.Ltd Economic and Technology Research Institute WuhanHubeiChina State Grid Hubei Extra High Voltage Company WuhanChina

Selecting suitable materials to adsorb the C_(4)F_(7)N mixtures decomposition products could not only keep the stable operation of the environmentally friendly insulating gas switch cabinet,but also ensure the safety of operation and maintenance *** is necessary to study the interaction of three types of molecular sieves with the C_(4)F_(7)N mixture and its decomposition products,which could provide a theoretical basis for the selection of adsorbents in the C_(4)F_(7)N gas switch *** this research,the molecular dynamics simulation was used to study the C_(4)F_(7)N-CO_(2)mixture and its ten kinds of decomposition products CO,CF_(4),C_(2)F_(6),C_(3)F_(6),C_(3)F_(8),CF_(3)H,CF_(3)CN,C_(2)F_(5)CN,C_(2)N_(2),and COF_(2)in three molecular sieves adsorption process(NaA,NaZSM-5,and NaX).The gas concentration distribution curve and interaction energy parameters were obtained by *** interaction energies of C_(3)F_(8)in NaA,C_(4)F_(7)N in NaZSM-5,and C_(3)F_(6)in NaX molecular sieve are the largest,which are−368.35 kJ/mol,−174.93 kJ/mol,and−340.09 kJ/mol ***,the theoretical results were verified by the fluorocarbon gases adsorption *** adsorption performance of three molecular sieves for all gases was obtained by combining the experimental results and dynamics *** adsorption rate of the NaA molecular sieve for fluorocarbon gas is less than 35%,and its adsorption performance for all gases is ***-5 and NaX molecular sieves show excellent adsorption performance for C_(3)F_(6)and C_(3)F_(8),and the adsorption rates are over 70%.NaZSM-5 molecular sieve shows good adsorption capacity for CF_(3)CN,C_(2)F_(6),C_(2)N_(2),C_(3)F_(6),C_(3)F_(8),C_(4)F_(7)N,and C_(2)F_(5)*** molecular sieve shows good adsorption capacity for C_(3)F_(6),C_(3)F_(8),C_(4)F_(7)N,and C_(2)F_(5)*** of them have the potential to be used as adsorbents in environmental protection insulated gas switch cabinet.

关键词： sieve adsorption gases

Flow characteristics of radial inflow in impeller rear cavity with baffle plate

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Chinese Journal of Aeronautics 2024年第2期37卷 270-282页

作者： yang BAI Xiang LUO Dongdong liu Zeyu WU Xiaoqiang ZHANG Sipeng WANG Research Institute of Aero-Engine Beihang UniversityBeijing 100191China National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeijing 100191China School of Energy and Power Engineering Beihang UniversityBeijing 100191China

The research purpose of this paper is to explore the influence of the baffle plate on the airflow in the rear cavity of the centrifugal impeller and optimize the performance of the secondary air system’s air bleed *** this paper,a comprehensive experimental study was carried out on the flow characteristics in the impeller rear cavity with baffle *** windage torque,flow structure and pressure drop between inlet and outlet were measured *** experiment was carried out with the condition that the range of rotational Reynolds number was from 8.33×10^(5)to 22.2×10^(5)and the range of mass flow rate coefficient was from 0.92×10^(4)to 2.92×10^(4).The results show that the static cavity and the narrow stator-rotor cavity formed by the baffle plate effectively suppress the overall swirl coefficient in the ***,the static pressure and total pressure drop in the rotor-stator cavity were *** influence of the baffle plate on the windage torque of the rotary disk is related to the turbulence *** large turbulence parameters,the windage torque would be reduced with baffle plate,while under small turbulence parameters,the baffle plate would increase with baffle *** general,the baffle plate can improve the flow capacity and optimize the bleed air performance with proper structure and operation conditions.

关键词： Impeller rear cavity Baffle plate Flow structure Windage torque Pressure drop

Recent advances in deep learning based sentiment analysis

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Science China(Technological Sciences) 2020年第10期63卷 1947-1970页

作者： YUAN JianHua WU yang LU Xin ZHAO YanYan QIN Bing liu Ting Research Center for Social Computing and Information Retrieval Harbin Institute of TechnologyHarbin 150001China Pengcheng Lab Shenzhen 518066China

Sentiment analysis is one of the most popular research areas in natural language *** is extremely useful in many applications,such as social media monitoring and *** application of deep learning based methods has dramatically changed the research strategies and improved the performance of many traditional sentiment analysis tasks,such as sentiment classification and aspect based sentiment ***,it also pushed the boundary of various sentiment analysis task,including sentiment classification of different text granularities and in different application scenarios,implicit sentiment analysis,multimodal sentiment analysis and generation of sentiment-bearing *** this paper,we give a brief introduction to the recent advance of the deep learning-based methods in these sentiment analysis tasks,including summarizing the approaches and analyzing the *** survey can be well suited for the researchers studying in this field as well as the researchers entering the field.

关键词： coarse-grained fine-grained implicit multi-modal generation

Dynamic wheeled motion control of wheel-biped transformable robots

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Biomimetic Intelligence & Robotics 2022年第2期2卷 1-8页

作者： chao Zhang Tangyou liu Shuang Song Jiaole Wang Max Q-H.Meng The School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China

Most existing biped robots can only walk with their feet or move by *** combine the best of both worlds,this paper introduces the dynamic wheeled control including wheeled locomotion and in-situ wheel-to-foot(WtF)transformation of a full-sized wheel-biped transformable robot *** can traverse on flat surfaces by wheels and transform to footed stance through its switching modules when facing *** wheeled locomotion,the kinematics considering upper-body lumped center-of-mass(CoM)constraint is first ***,the dynamics of wheeled locomotion is modeled as a wheeled inverted pendulum(WIP)with variables related to the pose of upper *** that,a parameter-varying linear quadratic regulator(LQR)controller is utilized to enable dynamic wheeled *** WtF transformation,the WtF balance constraints are first ***,a WtF transformation strategy is proposed to tackle the problem when robot transforms from wheeled balance state to in-situ biped stance *** enables the robot to pass by the transition stages in which both wheels and feet touch the ground and to maintain its balance at the same *** and experiments on the SR600-II prototype have validated the efficacy of proposed dynamic wheeled control strategies for both wheeled locomotion and in-situ WtF transformation.

关键词： Wheel-biped transformable robot Dynamic control Wheeled locomotion Parameter-varying LQR control Wheel-to-foot transformation

Performance Study of a Novel Ejector-Cascade Refrigeration System with Regenerator

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Journal of Thermal Science 2024年第5期33卷 1618-1629页

作者： CHI Weikai yang Qichao CHEN Xiaonan liu Guangbin ZHAO Yuanyang LI Liansheng College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061China

In this paper,a novel NH_(3)/CO_(2)ejector-cascade refrigeration system with regenerator is proposed,which can recycle the waste heat at the outlet of the *** establishing the mathematical model of the system,the theoretical energy and exergy analysis are carried out and compared with the conventional cascade refrigeration *** is concluded that compared with the conventional cascade refrigeration system,the novel ejector-cascade refrigeration system with regenerator has the advantages of less power consumption of the compressor,less component exergy destruction,high system performance,and is more suitable for working at a lower *** the working conditions studied in this paper,compared with the conventional cascade refrigeration system,the COP of the novel ejector-cascade refrigeration system with regenerator is increased by9.58%;the exergy efficiency is increased by 9.50%,and the optimal evaporation temperature is about-45℃.

关键词： cascade refrigeration system ejector regenerator system performance thermodynamic analysis

Photocatalytic direct oxygen-isotopic labelings of carbonyls in ketones and aldehydes with oxygen-isotopic waters

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Chinese Chemical Letters 2023年第11期34卷 131-136页

作者： Xianjin Zhu Yong liu Lunyu Ou Haijun yang Hua Fu Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China

Oxygen-isotopic labelings play important roles in identifying and understanding chemical and biological *** C=O to C=^(18)O or C=^(17)O conversion in a single step leading to labeled compounds can alleviate synthetic burdens without the need for *** we describe a photocatalytic oxygenisotopic labeling protocol that can efficiently and selectively install ^(18)O and ^(17)O on carbonyls of ketones and aldehydes via oxygen isotope exchange with oxygen-isotopic waters(H_(2)^(18)O or H_(2)^(17)O)as the sources of oxygen isotopes,in which light and oxygen-enabled sodium alkanesulfinates catalyzed this *** strategy was extended to the in-situ formed ketones from the photocatalytic aerobic oxidation of alkyl arenes and secondary ***,reduction of the oxygen-isotopically labeled aldehydes with NaBH_(4) provided the corresponding oxygen-isotopically labeled primary *** believe that the oxygen-isotopically labeling method will be widely used in chemistry,biology and medicine fields.

关键词： Oxygen-isotopic labeling Photocatalysis Oxygen-isotopic waters Compounds containing carbonyls Alkanesulfinates

基于不可压缩光滑粒子动力学的黏性液滴变形过程仿真

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物理学报 2013年第12期62卷 328-333页

作者：邱流潮中国农业大学应用力学系北京100083

应用基于投影算法的不可压缩光滑粒子动力学(incompressible smoothed particle hydrodynamics,ISPH)法对黏性液滴变形过程进行了数值仿真.对于张力失稳导致的粒子非物理簇集问题,采用粒子移位技术加以解决.为了验证本文ISPH算法的精度... 详细信息

应用基于投影算法的不可压缩光滑粒子动力学(incompressible smoothed particle hydrodynamics,ISPH)法对黏性液滴变形过程进行了数值仿真.对于张力失稳导致的粒子非物理簇集问题,采用粒子移位技术加以解决.为了验证本文ISPH算法的精度和稳定性,分别模拟了圆形黏性液滴的拉伸变形过程以及方形液滴的旋转变形过程,得到了不同时刻液滴内部的压力变化特征,准确地捕捉了液滴自由面演化过程,并将数值计算结果与文献中的解析解进行了比较.分析结果表明,基于投影算法的不可压缩光滑粒子动力学方法结合粒子移位技术,能够有效地模拟黏性液滴变形过程,可以得到精确和稳定的结果.

关键词：不可压缩光滑粒子动力学黏性液滴自由面流动数值仿真

Hole-Transporting Low-Dimensional Perovskite for EnhancingPhotovoltaic Performance

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Research 2021年第1期2021卷 901-911页

作者： Fangfang Wang Qing Chang Yikai Yun Sizhou liu You liu Jungan Wang Yinyu Fang Zhengchun Cheng Shanglei Feng Lifeng yang Yingguo yang Wei Huang Tianshi Qin Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteShanghai Institute of Applied PhysicsChinese Academy of Sciences239 Zhangheng RoadShanghai 201204China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&Telecommunications9 Wenyuan RoadNanjing 210023China Frontiers Science Center for Flexible Electronics(FSCFE)&Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an 710072China Ningbo Institute of Northwestern Polytechnical University 818 Qingyi RoadNingbo 315103China

Halide perovskites with low-dimensionalities(2D or quasi-2D)have demonstrated outstanding stabilities compared to their 3D ***,poor charge-transporting abilities of organic components in 2D perovskites lead to relatively low power conversion efficiency(PCE)and thus limit their applications in ***,we report a novel hole-transporting low-dimensional(HT2D)perovskite,which can form a hole-transporting channel on the top surface of 3D perovskite due to self-assembly effects of metal halide *** HT2D perovskite can significantly reduce interface trap densities and enhance hole-extracting abilities of a heterojunction region between the 3D perovskite and hole-transporting ***,the posttreatment by HT2D can also reduce the crystal defects of perovskite and improve film *** a result,perovskite solar cells(PSCs)can effectively suppress nonradiative recombination,leading to an increasement on photovoltage to>1.20 V and thus achieving>20%power conversion efficiency and>500 h continuous illumination *** work provides a pathway to overcome charge-transporting limitations in low-dimensional perovskites and delivers significant enhancements on performance of PSCs.

关键词： stability perovskite illumination