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Dispatch Model for Integrated Heat and Power Systems Considering Internal Composition of CHP Plants

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CSEE Journal of Power and Energy Systems 2021年第2期7卷 396-407页

作者： Tuo Jiang yong Min Guiping Zhou Lei chen Qun chen fei Xu Department of Electrical Engineering Tsinghua UniversityBeijing 100084China State Grid Liaoning Electric Power Supply Co.Ltd. Shenyang 110000China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

An integrated heat and power system(IHPS)is a promising approach for alleviating wind curtailment *** an IHPS,the combined heat and power(CHP)plant is the key component,which supplies both heat and electric loads,and couples the thermal system and power ***,existing research commonly ignores or simplifies the internal composition of CHP plants,which could lead to some unavoidable *** paper focuses on the internal composition of CHP plants,and models the physical processes in different components and flexible resources in the CHP ***,a joint dispatch problem of an IHPS with the above CHP plant models is formulated,and an iterative algorithm is developed to handle the nonlinearity in this *** studies are performed based on a real CHP plant in Northern China,and the results indicate that the synergistic effect of different energy resources in the CHP plant is realized by the joint dispatch model,which promotes wind power accommodation and reduces fossil fuel consumption.

关键词： Combined heat and power(CHP)plant CHP unit economic dispatch Integrated heat and power system wind power integration

In-Depth Energy and Irreversibility Analysis in the Solar Driven Two-Step Thermochemical Water Splitting Cycle for Hydrogen Production

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Journal of Thermal Science 2023年第1期32卷 1-16页

作者： JIAO Fan LU Buchu chen chen DAI fei LIU Taixiu LIU Qibin School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China School of Engineering and Science University of Chinese Academy of SciencesBeijing 100049China School of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310032China

Hydrogen production via a two-step thermochemical cycle based on solar energy has attracted increasing ***,the severe irreversible loss causes the low *** make sense of the irreversibility,an in-depth thermodynamic model for the solar driven two-step thermochemical cycles is *** from previous literatures solely focusing on the energy loss and irreversibility of devices,this work decouples a complex energy conversion process in three sub-processes,i.e.,reaction,heat transfer and re-radiation,acquiring the cause of irreversible *** results from the case study indicate that the main irreversibility caused by inert sweeping gas for decreasing the reduction reaction temperature dominates the cycle *** reduction reaction temperature without severe energy penalty of inert sweeping gas is important to reducing this irreversible loss.A favorable performance is achieved by decreasing re-oxidation rate,increasing hydrolysis conversion rate and achieving a thermochemical cycle with a lower equilibrium temperature of reduction reaction at atmosphere *** research clarifies the essence of process irrrversibility in solar thermichemical cycles,and the findings point out the potential to develop efficient solar driven two-step thermochemical cycles for hydrogen production.

关键词： thermochemical cycle hydrogen irreversibility thermodynamics

NEAR-FIELD ACOUSTIC HOLOGRAPHy FOR SEMI-FREE ACOUSTIC FIELD BASED ON WAVE SUPERPOSITION APPROACH

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Chinese Journal of Mechanical Engineering 2006年第3期19卷 455-459页

作者： LI Weibing chen Jian yU fei chen Xinzhao Institute of Sound and Vibration Research Hefei University of Technology Hefei 230009 China

In the semi-free acoustic field, the actual acoustic pressure at any point is composed of two parts： The direct acoustic pressure and the reflected acoustic pressure. The general acoustic holographic theories and algorithms request that there is only the direct acoustic pressure contained in the pressure at any point on the hologram surface, consequently, they cannot be used to reconstruct acoustic source and predict acoustic field directly. To take the reflected pressure into consideration, near-field acoustic holography for semi-free acoustic field based on wave superposition approach is proposed to realize the holographic reconstruction and prediction of the semi-free acoustic field, and the wave superposition approach is adopted as a holographic transform algorithm. The proposed theory and algorithm are realized and verified with a numerical example, and the drawbacks of the general theories and algorithms in the holographic reconstruction and prediction of the semi-free acoustic field are also demonstrated by this numerical example.

关键词： Near-field acoustical holography Semi-free acoustic field Wave superposition approach

Apert syndrome diagnosed by prenatal ultrasound combined with magnetic resonance imaging and whole exome sequencing:A case report

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World Journal of Clinical Cases 2021年第4期9卷 912-918页

作者： Lei chen fei-Xiang Huang Ultrasonography Department Hangzhou Women’s HospitalHangzhou 310008Zhejiang ProvinceChina Department of Traditional Chinese Medicine Hangzhou Women’s HospitalHangzhou 310008Zhejiang ProvinceChina

BACKGROUND Most cases of Apert syndrome(AS)are found after *** of AS diagnosed by ultrasound combined with magnetic resonance imaging(MRI)and whole exome sequencing(WES)during pregnancy are *** SUMMARy We present the case of a 34-year old female patient(gravida 2,para 1)whose fetus was diagnosed with AS during *** ultrasound performed at 30,2/7 wk of pregnancy showed *** and three-dimensional ultrasound performed at 31,1/7 wk of pregnancy showed the possibility of *** examination and core family WES were conducted at 31,5/7 wk of *** results showed that FGFR2 in the fetus had a c.755C>G missense mutation in its nucleotide,and AS was *** This case highlights the importance of imaging *** ultrasound combined with MRI can identify fetal morphological abnormalities accurately,which can be confirmed by WES.

关键词： Apert syndrome Prenatal ultrasound Magnetic resonance imaging Whole exome sequencing FGFR2 Case report

Constructing robust NiFe LDHs-NiFe alloy gradient hybrid bifunctional catalyst for overall water splitting:one-step electrodeposition and surface reconstruction

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Rare Metals 2023年第7期42卷 2272-2283页

作者： yi-fei chen Jia-Hong Li Tian-Tian Liu Si-Hang you Peng Liu Fu-Jin Li Meng-Qi Gao Shu-Guang chen fei-fei Zhang School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha410114China Faculty of Engineering Department of Materials Science and EngineeringNational University of SingaporeSingapore117576Singapore School of Materials Science and Engineering Jilin UniversityChangchun130022China

NiFe layered double hydroxides(NiFe LDHs)have been intensively developed for the oxygen evolution reaction(OER)in alkaline media;however,their unsatisfactory hydrogen evolution reaction(HER)performance limits their practical application in overall water ***,a simple and efficient one-step electrodeposition method is used to accomplish in situ growth of NiFe LDHsNiFe alloy gradient hybrid coatings on a carbon cloth(CC).Within the binder-free electrode,NiFe LDHs nanosheets with a low-crystalline nature exhibit highly active bifunctional OER/HER activities,and the NiFe alloy acts as a stable electron highway and strong skeleton bridge between NiFe LDHs and the *** the electrodes are simultaneously employed as the cathode and anode for overall water splitting,they require low cell potentials of 1.441 V at10 mA·cm^(-2)and 1.703 V at 100 mA·cm^(-2),respectively,and they demonstrate outstanding stability at a current density greater than 100 mA·cm^(-2)for more than 100 *** is one of the best bifunctional OER and HER catalysts for overall water *** lattice defects and surface reconstructions crucially contribute to the bifunctional OER/HER activities of NiFe *** simple and scalable synthesis approach presents an intriguing paradigm for industrial production,and the fabricated electrode has potential application in high-current-density water splitting.

关键词： Bifunctional Electrodeposition Gradient hybrid NiFe layered double hydroxides(NiFe LDHs) Overall water splitting

Nuclear dynamics in multinucleon transfer reactions near Coulomb barrier energies

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Nuclear Science and Techniques 2018年第12期29卷 128-133页

作者： Peng-Hui chen fei Niu ya-fei Guo Zhao-Qing Feng Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100190China South China University of Technology Guangzhou 510641China

The mechanism of multinucleon transfer reactions has been investigated within the dinuclear system model, in which the sequential nucleon transfer is described by solving a set of microscopically derived master equations. The transfer dynamics in the reaction of^(136)Xe+^(208)Pb near Coulomb barrier energies is thoroughly analyzed. It is found that the total kinetic energies of primary fragments are dissipated from the relative motion energy of two touching nuclei and exhibit a symmetric distribution along the fragment mass. The angular distribution of the projectile-like fragments moves forward with increasing beam energy. However, the target-like fragments exhibit an opposite trend. The shell effect is pronounced due to the fragment yields in multinucleon transfer reactions.

关键词：原子动力学转移反应精力库仑相对运动显微镜子转移原子核

Comments on"Acupoint Catgut Embedding Alleviates Insomnia in Different Chinese Medicine Syndrome Types:A Randomized Controlled Trial"

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Chinese Journal of Integrative Medicine 2022年第6期28卷 575-576页

作者： WANG Cong chen yun-fei Department of Acupuncture and Moxibustion Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghai200437China

We recently read the paper entitled"Acupoint catgut embedding alleviates insomnia in different Chinese medicine syndrome types:a randomized controlled trial"by XU,et al.(1)The article elaborated on the effect and safety evaluation of acupoint catgut embedding for different Chinese medicine(CM)syndrome types of *** a randomized controlled trial article,it has rigorous design,clear inclusion and exclusion criteria,reasonable grouping.

关键词： Acupoint acupoint

Mechanics of Aquitard Drainage by Aquifer-System Compaction and Its Implications for Water-Management in the North China Plain

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Journal of Earth Science 2014年第3期25卷 598-604页

作者： chen Su Zongyu chen Jiang chen yuhong fei Jingsheng chen Baoqian Duan Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences

The deformation of aquitard is the main contribution to land subsidence in the North China Plain, and the water released from aquitard compaction may be a large portion of the exploited groundwater. In this study, the consolidation test was employed to understand the mechanics on the drainage and deformation of aquitard. The results suggested the strain of aquitard mainly resulted from the difference of hydraulic head between aquifers. And it was decreased with depth of aquitard at the same hydrodynamic pressure. In contrast with the interbed within aquifers, the aquitard was deformable when it was compressed. The weakly bound water was significantly released when the void ratio was about 0.44–0.45, and the EC of water released from the aquitard was decreased with the compacting process. The data from the consolidation test suggested that the pumping of groundwater from aquifer III might be less contribution to the land subsidence with respect to other aquifers in the future.

关键词： Quaternary aquifer clay consolidation test double layer land subsidence.

Virtual simulation of production line for ergonomics evaluation

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Advances in Manufacturing 2014年第1期2卷 48-53页

作者： Ming chen Jin-fei Liu Sino-German College of Applied Sciences Tongji UniversityShanghai 201804 People's Republic of China School of Electronics and Information Engineering Tongji University Shanghai 201804 People's Republic of China

To avoid ergonomic problems in the early planning stages of a production line and achieve more satisfactory planning and design, ergonomic simulation is particularly important in digital production line planning. An ergonomics analysis method is presented by using two theories： Ovako working posture analysis system （OWAS） and Burandt-Schultetus hand-arm force analysis （BSHA）. The processes of ergonomics analysis and simulation are discussed based on a platform of process simulation and process designer. As an example, the paper shows how ergonomics problems are considered in production line planning to make a better choice between different production line planning schemes.

关键词： Ergonomics Production line planning Process simulation and optimization