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Journal of Modern Power Systems and Clean Energy 2015年第4期3卷 597-609页

作者： Guangqian DING Ran WEI ke ZHOU Feng GAO yi TANG key Laboratory of Power System Intelligent Dispatch and Control(Shandong University) Ministry of EducationJinan 250061China State Grid Jining Electric Power Supply Company Jining 272000China School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AveSingapore 639798Singapore

This paper proposes a novel approach to compensate buses voltage and current harmonics through distributed generation(DG)interfacing converter in a multibus *** control approach of each individual DG unit was designed to use only feedback variables of the converter itself that can be measured *** the proposed approach,the adjacent bus voltage is indirectly derived from the measured DG converter output voltage,DG line current and line impedance.A voltage closed-loop controller and a current closed-loop controller are designed to achieve both functions of DG real power generation and harmonics ***,the traditional harmonic measurement devices installed at the bus as well as the long distance communication between the bus and the DG converter are not *** proposed approach can compensate the current harmonics,mitigate the buses voltage distortion and enable the customer devices to be operated in normal conditions within the multi-bus microgrid,and meanwhile relieve the burden of power quality regulator installed at the point of common *** simulations and experimental results are presented to show the operational effectiveness of the proposed approach.

关键词： Multi-bus microgrid Distributed generation Grid-tied converter Harmonic compensation control

Electrospun Textile Strategies in Tendon to Bone Junction Reconstruction

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Advanced Fiber Materials 2023年第3期5卷 764-790页

作者： Xiaoyun Xu yifan Si yi Zhao Qinfei ke Jinlian Hu Department of Biomedical Engineering City University of Hong KongHong Kong S.A.R 999077China Shanghai Frontiers Science Center of Advanced Textiles Donghua UniversityShanghai 201620China Shanghai Institute of Technology Shanghai 200235China

The repair of tendon to bone junction(TBJ)remains a tremendous challenge in tissue engineering due to the complicated structure,components,mechanical properties,and cell *** order to reconstruct the tissue and restore its functionality,biomedical scaffolds with hierarchical and gradient structures have been fabricated by various *** recent decades,electrospinning has become one of the most popular methods in fabricating TBJ scaffolds due to easy fabrication,high porosity,and ECM-like nano-scale ***,mechanical properties are the pain point of electrospun biomedical *** textile technology can be exploited to compensate for this weakness,which will be deeply discussed *** review will start with a brief introduction to the structure and function of the native TBJ tissue and a short overview of electrospinning ***,different electrospun biomedical scaffolds for TBJ repair will be summarized and ***,some advanced technologies and modification methods in fabricating functionalized electrospun TBJ scaffolds are *** the end,current challenges and solutions are being proposed,which would provide instruction for the research of electrospun textile TBJ scaffolds.

关键词： Electrospun Textile Tendon to bone Tissue engineering Biomimetic

Explicit Stationary Distribution of the(L,1)-reflecting Random Walk on the Half Line

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Acta Mathematica Sinica,English Series 2014年第3期30卷 371-388页

作者： Wen Ming HONG ke ZHOU yi Qiang Q.ZHAO School of Mathematical Sciences & Laboratory of Mathematics and Complex Systems Beijing Normal University School of Mathematics and Statistics Carleton University

In this paper,we consider the（L,1） state-dependent reflecting random walk（RW） on the half line,which is an RW allowing jumps to the left at a maximal size *** this model,we provide an explicit criterion for（positive） recurrence and an explicit expression for the stationary *** an application,we prove the geometric tail asymptotic behavior of the stationary distribution under certain *** main tool employed in the paper is the intrinsic branching structure within the（L,1）-random walk.

关键词： Random walk multi-type branching process recurrence positive recurrence stationarydistribution tail asymptotic

Study of a ceramic burner for shaftless stoves

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 149-153页

作者： Fang-qin Dai Su-yi Huang Shao-hua Li ke Liu School of Energy ＆ Power Engineering Huazhong University of Science and Technology Wuhan 430074 China Thermal Engineering Research Institute Wuhan Research Institute of Metallurgical Construction Wuhan 430081 China

A multi-burner-port annular flameless ceramic burner （MAFCB） of the shaftless stove for blast furnaces was designed. The characteristics of pressure drop, homogeneousness of the flows at burner ports, and distribution of the flows in the chambers and joint were studied by cold model experiments. This type of ceramic burner was successfully applied in 6# blast furnace at Liuzhou Iron ＆ Steel Co. Ltd. （LISC） and this practice proved that it could be used in the hot blast stove and other stoves with a higher efficiency and a higher steadiness of hot blast temperature at 1200℃. With the combustion of blast furnace gas alone, the thermal efficiency was up to 78.95%, saving energy remarkably.

关键词： ceramic burner blast furnace cold model experiments ironmaking

Composition design and performance evaluation of rubber-particle cement-stabilized gravel

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Frontiers of Structural and Civil Engineering 2024年第9期18卷 1466-1477页

作者： Chaohui WANG ke yi Feng CHEN Luqing LIU Xiaolei ZHOU Zhiwei GAO School of Highway Chang’an UniversityXi’an 710064China Shaanxi Transportation Technology Consulting Co. Ltd.Xi’an 710068China School of Information Engineering Xizang Minzu UniversityXianyang 71208China

To improve the mechanical properties and durability of the cement-stabilized base,rubber particles of three different sizes and with three different contents were optimally selected,the evolution laws of the mechanical strength and toughness of rubber-particle cement-stabilized gravel(RCSG)under different schemes were determined,and the optimal particle size and content of rubber particles were *** this basis,the durability of the RCSG base was *** results show that with an increase in the rubber particle size and content,the mechanical strength of RCSG gradually decreased,whereas the toughness and transverse deformation ability gradually increased.1%content and 2–4 mm sized RCSG can better balance the relationship between mechanical strength and *** 7 d unconfined compressive strength was 17.7%higher than that of the 4–8 mm *** 28 d toughness index and ultimate splitting strain can be increased by 9.8%and 6.3 times,respectively,compared with ordinary cement-stabilized gravel(CSG).In terms of durability,compared with CSG,RCSG showed a 3.7%increase in the water stability property of cement-stabilized base with 1%content and 2–4 mm rubber particles,5.5%increase in the frozen coefficient,and 80.6%and 37.9%increase in the fatigue life at 0.70 and 0.85 stress ratio levels,respectively.

关键词： pavement materials cement-stabilized gravel rubber particles material components mechanical property durability performance

Utilizing 3D bioprinted platelet-rich fibrin-based materials to promote the regeneration of oral soft tissue

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Regenerative Biomaterials 2022年第1期9卷 234-246页

作者： ke yi Qing Li Xiaodong Lian Yapei Wang Zhihui Tang Second Clinical Division Peking University School and Hospital of StomatologyBeijing 100101China National Engineering Research Center of Oral Biomaterials and Digital Medical Devices Beijing 100081China Center of Digital Dentistry Peking University School and Hospital of StomatologyBeijing 100081China Department of Chemistry Renmin University of ChinaBeijing 100872China

Oral soft tissue defects remain difficult to treat owing to the limited efficacy of available treatment *** the injectable platelet-rich fibrin(i-PRF)is a safe,autologous source of high levels of growth factors that is often employed to promote the regeneration of oral soft tissue,its effectiveness is restrained by difficulties in intraoperative shaping together with the burst-like release of growth *** herein sought to develop a bioactive bioink composed of i-PRF,alginate and gelatin capable of promoting the regeneration of the oral soft *** bioink was successfully applied in 3D bioprinting and exhibited its ability to be shaped to individual patient ***,we were also able to significantly prolong the duration of multiple growth factors release as compared to that observed for *** growth factor bioavailability was further confirmed by the enhanced proliferation and viability of printed gingival *** deployed in vivo in nude mice,this bioink was further confirmed to be biocompatible and to drive enhanced angiogenic ***,these data thus confirmthe successful production of an i-PRF-containing bioink,which is suitable for the individualized promotion of the regeneration of oral soft tissue.

关键词： injectable platelet-rich fibrin 3D bioprinting oral soft tissue engineering regenerative medicine

Resource allocation algorithm with cross-layer design for DiffServ-based OFDM systems

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The Journal of China Universities of Posts and Telecommunications 2007年第2期14卷 45-50页

作者： LI Xiao-hui HAN Ming yi ke-chu TIAN Bin key Laboratory of Integrated Services Networks Xidian University Xi'an 710071 China

According to the quality of service （QoS） requirements of differentiated service （DiffServ）, a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing （OFDM） systems is presented. The constant rate is maintained by adjusting the power dynamically for the voice traffics with high priority, whereas the fairness amongst the data traffics is guaranteed by weighted fairness queued （WFQ） algorithm. The two above-mentioned strategies are used for video traffics to realize variable data rate with the constraint of the minimum rate. Combing all these methods, both the throughput and the fairness are ensured when there are multiple users in the OFDM system. Simulation results indicate the validity of the proposed algorithm, which can work well even if the SNR is less than 0 dB.

关键词： OFDM cross-layer QoS DiffServ

Automatic data archiving and visualization at HLS-Ⅱ

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Nuclear Science and Techniques 2018年第9期29卷 179-184页

作者： yi-Fan Song Chuan Li ke Xuan Gong-Fa Liu National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

The control system of Hefei Light Source II(HLS-Ⅱ) is a distributed system based on the experimental physics and industrial control system(EPICS). It is necessary to maintain the central configuration files for the existing archiving system. When the process variables in the control system are added, removed, or updated, the configuration files must be manually modified to maintain consistency with the control system. This paper presents a new method for data archiving, which realizes the automatic configuration of the archiving parameters. The system uses microservice architecture to integrate the EPICS Archiver Appliance and Rec Sync. In this way, the system can collect all the archived meta-configuration from the distributed input/output controllers and enter them into the EPICS Archiver Appliance automatically. Furthermore, we also developed a web-based GUI to provide automatic visualization of real-time and historical data. At present,this system is under commissioning at HLS-Ⅱ. The results indicate that the new archiving system is reliable and convenient to operate. The operation mode without maintenance is valuable for large-scale scientific facilities.

关键词： Automatic archiving Data visualization Microservice architecture EPICS Archiver Appliance

Control of Negative Gravitropism and Tension Wood Formation by Gibberellic Acid and Indole Acetic Acid in Fraxinus mandshurica Rupr. var. japonica Maxim Seedlings

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Journal of Integrative Plant Biology 2006年第2期48卷 161-168页

作者： Sha Jiang yi-Fan Li Xu-Hui Chen ke Xu College of Life Sciences Nankai University Tianjin 300071 China

In the present study, we Investigated the role of glbberelllc acid （GA3） and Indole acetic acid （IAA） In the gravity response of stems and tension wood formation using two-year-old stems of Fraxinus mandshurica Rupr. var. Japonica Maxim seedlings. Forty-five seedlings were used and divided Into nine groups that Included five seedlings In each group. Seedlings were treated with applications of GA3 alone at concentrations of 2.89×10^-8 and 2.89×10^-7 μmol/L, IAA alone at concentrations of 5.71×10^-8 and 5.71×10^-7 μmol/L, or their combination to the apical bud of the stem using a mlcroplpette. Seedlings were positioned horizontally after the first treatment. The same treatments were repeated six times per week. At the end of the experiment, all seedlings were harvested. Then, stem segments were cut under a light microscope. Application of exogenous GA3 at the higher concentration stimulated the upward bending of stems, whereas exogenous IAA had no effect. A synergistic effect of GA3 and IAA on upward stem bending was observed following application of the two combinations of GA3 and IAA. Moreover, application of exogenous GA3 at the higher dose stimulated wood formation on both the upper and lower sides of the stems, whereas the mixture of GA3 and IAA had a synerglstic effect on wood formation In horizontal stems. Application of exogenous IAA alone at the lower concentration （5.71×10^-8 μmol/L） or application of a mixture of the higher concentrations of GA3 （2.89×10^-7 μmol/L） and IAA （5.71×10^-7 μmol/L） Inhibited the development of gelatinous fibers （the G-layer） of tension wood on the upper side of the horizontal stems. The differentiation of gelatinous fibers of tension wood was not Inhibited by GA3 when It was applied alone, whereas the development of the gelatinous fibers of tension wood was strongly affected by the application of IAA. The findings of the present study suggest that the development of the G-layer Is not related to the dose of GA3, but needs a relat

关键词： Fraxinus mandshurica gibberellic acid indole acetic acid interaction negative gravitropism tension wood.

Primary neuronal-astrocytic co-culture platform for neurotoxicity assessment of di-(2-ethylhexyl) phthalate

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Journal of Environmental Sciences 2014年第5期26卷 1145-1153页

作者： Yang Wu ke Li Haoxiao Zuo Ye Yuan yi Sun Xu Yang Section of Environmental Biomedicine Hubei Key Laboratory of Genetic Regulation and Integrative Biology Central China Normal University Department of Molecular and Medical Pharmacology University of California Los Angeles (UCLA) Wuhan Institute of Drug and Food Control

Plastics such as polyvinyl chlorides （PVC） are widely used in many indoor constructed environments; however, their unbound chemicals, such as di-（2-ethylhexyl） phthalates （DEHP）, can leach into the surrounding environment. This study focused on DEHP＇s effect on the central nervous system by determining the precise DEHP content in mice brain tissue after exposure to the chemical, to evaluate the specific exposure range. Primary neuronal-astrocyte co-culture systems were used as in vitro models for chemical hazard identification of DEHP. Oxidative stress was hypothesized as a probable mechanism involved, and therefore the total reactive oxygen species （ROS） concentration was determined as a biomarker of oxidative stress. In addition, NeuriteTracer, a neurite tracing plugin with ImageJ, was used to develop an assay for neurotoxicity to provide quantitative measurements of neurological parameters, such as neuronal number, neuron count and neurite length, all of which could indicate neurotoxic effects. The results showed that with 1 nmol/L DEHP exposure, there was a significant increase in ROS concentrations, indicating that the neuronal-astrocyte cultures were injured due to exposure to DEHP. In response, astrocyte proliferation （gliosis） was initiated, serving as a mechanism to maintain a homeostatic environment for neurons and protect neurons from toxic chemicals. There is a need to assess the cumulative effects of DEHP in animals to evaluate the possible uotake and effects on the human neuronal system from exoosure to DEHP in the indoor environment.

关键词： di-(2-ethylhexyl)phthalate neurotoxicity immunostaining oxidative stress neuron count neurite length astrocyte gliosis