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An experimental study of a single-piston free piston linear generator

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Frontiers in Energy 2022年第6期16卷 916-930页

作者： Jin XIAO yingdong cheng Jinlong WANG chengwei ZHU Zhen HUANG Key Laboratory for Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China

Free piston linear generator(FPLG)is a promising range extender for the electrical vehicle with unparallel advantages,such as compact structure,higher system efficiency,and reduced maintenance ***,due to the lack of the mechanic crankshaft,the related piston motion control is a challenge for the FPLG which causes problems such as misfire and crash and limits its widespread *** at resolving the problems as misfire,a single-piston FPLG prototype has been designed and manufactured at Shanghai Jiao Tong University(SJTU).In this paper,the development process and experimental validation of the related control strategies were *** the experimental studies,significant misfires were observed at first,while the FPLG operated in natural-aspiration *** root cause of this misfire was then identified as the poor scavenging process,and a compressed air source was leveraged to enhance the related scavenging ***,optimal control parameters,in terms of scavenging pressure,air-fuel equivalence ratio,and ignition position,were then calibrated in this charged-scavenging ***,the FPLG prototype has achieved a continuous stable operation of over 1000 cycles with an ignition rate of 100%and a cycle-to-cycle variation of less than 0.8%,produced an indicated power of 2.8 kW with an indicated thermal efficiency of 26%and an electrical power of 2.5 kW with an overall efficiency of 23.2%.

关键词： free piston linear generator(FPLG) charged scavenging engine control misfire stable operation

管形吻合器乙状结肠造口术在腹腔镜下腹会阴切除术中的应用

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重庆医学 2014年第5期43卷 556-557,560页

作者：马丹张朝军陈祖林程应东杨桦第三军医大学附属新桥医院普通外科重庆400037

目的探讨管形吻合器乙状结肠造口术在腹腔镜下腹会阴切除术(LAPR)中的临床应用价值。方法回顾分析2010年10月至2013年2月,于LAPR术中行管形吻合器乙状结肠单腔造口34例(A组);同期LAPR术中采用传统手工缝合法行乙状结肠单腔造口28例(B组... 详细信息

目的探讨管形吻合器乙状结肠造口术在腹腔镜下腹会阴切除术(LAPR)中的临床应用价值。方法回顾分析2010年10月至2013年2月,于LAPR术中行管形吻合器乙状结肠单腔造口34例(A组);同期LAPR术中采用传统手工缝合法行乙状结肠单腔造口28例(B组)。术后对两种造口方法从手术时间、术后造口排气时间、术后平均住院日、造口相关并发症发生率进行统计分析。结果两组无中转开腹,无手术死亡病例。A组手术时间、术后造口排气时间、术后平均住院日、造口肠管水肿发生率均低于B组,差异有统计学意义(P<0.05)。结论管形吻合器乙状结肠造口术应用于LAPR可进一步减小患者创伤,缩短手术时间,加快患者术后恢复,减少术后并发症发生,值得推广。

关键词：结肠 ,乙状腹腔镜管形吻合器单腔造口术

Control of Corner Separation for a Linear Compressor Cascade via Bionic Slanting Riblets at the Endwall

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Journal of Thermal Science 2025年第1期34卷 129-144页

作者： ZHANG Peng LI Yonghong cheng Rixin Key Laboratory of Civil Aircraft Airworthiness Technology Civil Aviation University of China College of Aeronautical Engineering Civil Aviation University of China

A new passive control approach,utilizing bionic slanting riblets,is employed to mitigate the flow close to the blade endwall in a linear cascade,and its effectiveness and mechanism in controlling corner separation are investigated through numerical *** slanting riblets are positioned at the endwall upstream of the cascade channel,and the influence of riblet height,yaw angle and relative position on the control of corner separation is *** findings indicate that the application of slanting riblets can efficiently counteract corner separation across the stable operational ***,the introduction of riblets with a height of merely 0.1 times the boundary layer thickness results in a significant reduction in total pressure loss by up to 14.53%,while simultaneously enhancing the static pressure coefficient by 21.74%.Flow analysis reveals that minute vortices produced within the riblet channels tend to coalesce,forming a potent large-scale vortex near the boundary layer's base *** phenomenon results in reduced additional losses compared to conventional vortex ***,the induced vortex promotes enhanced mixing between the mainstream flow and boundary layer,inhibiting the lateral displacement of low-energy fluids within the endwall boundary ***,this delays the onset of separation vortex formation and eliminates vortex rings in the corner region,ultimately enhancing the aerodynamic efficiency of the cascade.

关键词： additional losses compressor cascade corner separation slanting riblets vortex generator

基于准比例谐振控制的自由活塞内燃直线发电机发电策略

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内燃机工程 2023年第6期44卷 100-108页

作者：鲁述豪肖进张宸程莹东王金龙黄震上海交通大学动力机械及工程教育部重点实验室上海200240

针对自由活塞内燃直线发电机稳定运行时产生的三相感应电动势难以直接应用到负载或动力电池的问题,提出了基于电压外环比例积分(proportion integration,PI)、电流内环准比例谐振(quasi proportional resonance,QPR)的双闭环交流/直流(a... 详细信息

针对自由活塞内燃直线发电机稳定运行时产生的三相感应电动势难以直接应用到负载或动力电池的问题,提出了基于电压外环比例积分(proportion integration,PI)、电流内环准比例谐振(quasi proportional resonance,QPR)的双闭环交流/直流(alternating current/direct current,AC/DC)控制策略加上基于PI的双向直流/直流(direct current/direct current,DC/DC)控制策略,将直线发电机产生的三相感应电动势转换为稳定可控的直流电压。首先根据双闭环AC/DC控制策略生成控制三相电压源型整流器开关管通断的信号,将三相感应电动势整流为波动较小的直流电压,然后通过双向DC/DC控制策略将波动的直流电压转换为稳定可控的电压,最后在MATLAB/Simulink环境下搭建了相应的控制模型进行验证。仿真结果表明,双闭环AC/DC控制策略中电流内环采用QPR控制相比于PI和比例谐振(proportional resonance,PR)控制直流侧电压具有更快的响应速度和更小的电压纹波,可以在0.3 s稳定在400 V,电压纹波为48.9 V。在加入DC/DC转换器后直流侧电压可以在0.2 s稳定在300 V。

关键词：自由活塞内燃直线发电机准比例谐振控制空间矢量脉宽调制电压控制

Three-dimensional fracture of UO2 ceramic pellets by phase field modeling

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 169-180页

作者： Wei Xiong Xuan Ye Hongzhang cheng Xiaoming Liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Fracture is the primary failure type for the UO2ceramic pellets,which are operated under irradiation and thermal processes,and physically confined by the *** this work,by combining closely coupled physical processes of heat conduction,heat transfer,and mechanical deformation with the cohesive phase field framework,we proposed a high-precision modeling of quasistatic cracking of three-dimensional （3D） UO2ceramic fuel pellets under high temperature and *** simulation results agree well with the experimental results,indicating that the proposed method has the potential to capture 3D crack modes in the interested time ***,we studied the relation of the 3D fracture patterns of fuel pellets with the peak power *** was found that the power level plays a critical role in determining the competition between radial and circumferential cracks,as well as transverse penetrating cracks.

关键词： phase field method nuclear fuel pellet coupled thermo-mechanical model thermal fracture

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家族性腺瘤性息肉病外科手术方式的选择

临床外科杂志 2000年第2期8卷 81-83页

作者：程应东罗云生单志堂第三军医大学新桥医院普外科重庆400037

目的　探讨家族性腺瘤性息肉病 (FAP)手术方式的选择和效果。方法　对 17例 FAP的临床资料进行回顾性分析。结果　 17例病人中良性 13例 ,癌变 4例。全部病人均施行了全结肠切除 ,采用回肠造口 1例 ,回直肠吻合 2例 ,直肠切除、回肠肛... 详细信息

目的　探讨家族性腺瘤性息肉病 (FAP)手术方式的选择和效果。方法　对 17例 FAP的临床资料进行回顾性分析。结果　 17例病人中良性 13例 ,癌变 4例。全部病人均施行了全结肠切除 ,采用回肠造口 1例 ,回直肠吻合 2例 ,直肠切除、回肠肛管吻合或回肠储袋、回肠肛管吻合 7例 ,部分直肠切除、直肠粘膜剥脱经直肠肌鞘回肠肛管吻合 7例。并发症 2例 (肠坏死 1例 ,吻合口瘘 1例 )。随访 2～ 2 0年 ,良性病人术后均存活 ,其中 2例发生储袋炎 ,1例术后 5年发生癌变。4例癌变病人中 2例因广泛转移死亡 ,另 2例仍存活。排便功能以回肠造口术较差 ,保留直肠的术式较好。结论　比较各种术式的利弊 ,选择全结肠切除 ,保留直肠肌鞘 ,回肠储袋。

关键词：家族性腺瘤性息肉瘤外科手术结肠切除

Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textiles Qingdao University Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum Studies Beijing Normal University State Key Laboratory of Polymer Materials Engineering College of Polymer Science and Engineering Sichuan University

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs). However, the diverse structure of donors and acceptors makes the research challenging. Additives with customizable structures and properties could simplify this complexity. Herein, we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT) and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT), possessing distinct intermolecular interaction features to elaborate the inherent relationship. It is found that varied interaction strengths can alter film formation processes. The enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F, facilitating the formation of films with compact molecular packing and decent phase separation. Thus, exciton dissociation and charge transport become more efficient. Finally, devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35% in small-area OSCs and 14.11% in bladecoated 5 cm × 5 cm organic solar mini-modules. Especially, OSCs can maintain 80% of their initial efficiency after continuous annealing at 85 °C for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction

Tailoring Light–Matter Interactions in Overcoupled Resonator for Biomolecule Recognition and Detection

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Nano-Micro Letters 2025年第1期17卷 262-280页

作者： Dongxiao Li Hong Zhou Zhihao Ren cheng Xu chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Center for Intelligent Sensors and MEMS(CISM) National University of SingaporeSingapore 117608Singapore

Plasmonic nanoantennas provide unique opportunities for precise control of light–matter coupling in surface-enhanced infrared absorption(SEIRA)spectroscopy,but most of the resonant systems realized so far suffer from the obstacles of low sensitivity,narrow bandwidth,and asymmetric Fano resonance ***,we demonstrated an overcoupled resonator with a high plasmon-molecule coupling coefficient(μ)(OC-Hμresonator)by precisely controlling the radiation loss channel,the resonator-oscillator coupling channel,and the frequency detuning *** observed a strong dependence of the sensing performance on the coupling state,and demonstrated that OC-Hμresonator has excellent sensing properties of ultra-sensitive(7.25%nm^(−1)),ultra-broadband(3–10μm),and immune asymmetric Fano *** characteristics represent a breakthrough in SEIRA technology and lay the foundation for specific recognition of biomolecules,trace detection,and protein secondary structure analysis using a single array(array size is 100×100μm^(2)).In addition,with the assistance of machine learning,mixture classification,concentration prediction and spectral reconstruction were achieved with the highest accuracy of 100%.Finally,we demonstrated the potential of OC-Hμresonator for SARS-CoV-2 *** findings will promote the wider application of SEIRA technology,while providing new ideas for other enhanced spectroscopy technologies,quantum photonics and studying light–matter interactions.

关键词： Plasmonic nanoantennas Light-matter interaction Surface-enhanced infrared absorption Overcoupled Biosensing

A Multi-Objective Particle Swarm Optimization Algorithm Based on Decomposition and Multi-Selection Strategy

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Computers, Materials & Continua 2025年第1期82卷 997-1026页

作者： Li Ma Cai Dai Xingsi Xue cheng Peng School of Computer Science Shaanxi Normal UniversityXi’an710119China Fujian Provincial Key Laboratory of Big Data Mining and Applications Fujian University of TechnologyFuzhou350118China Information Construction and Management Center and Institute of Artificial Intelligence and Educational New Productivity Ningxia Normal UniversityGuyuan756099China

The multi-objective particle swarm optimization algorithm(MOPSO)is widely used to solve multi-objective optimization *** the article,amulti-objective particle swarm optimization algorithmbased on decomposition and multi-selection strategy is proposed to improve the search ***,two update strategies based on decomposition are used to update the evolving population and external archive,***,a multiselection strategy is *** first strategy is for the subspace without a non-dominated *** the neighbor particles,the particle with the smallest penalty-based boundary intersection value is selected as the global optimal solution and the particle far away fromthe search particle and the global optimal solution is selected as the personal optimal solution to enhance global *** second strategy is for the subspace with a non-dominated *** the neighbor particles,two particles are randomly selected,one as the global optimal solution and the other as the personal optimal solution,to enhance local *** third strategy is for Pareto optimal front(PF)discontinuity,which is identified by the cumulative number of iterations of the subspace without non-dominated *** the subsequent iteration,a new probability distribution is used to select from the remaining subspaces to ***,an adaptive inertia weight update strategy based on the dominated degree is designed to further improve the search ***,the proposed algorithmis compared with fivemulti-objective particle swarm optimization algorithms and five multi-objective evolutionary algorithms on 22 test *** results show that the proposed algorithm has better performance.

关键词： Multi-objective optimization multi-objective particle swarm optimization decomposition multi-selection strategy