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CSEE Journal of Power and Energy Systems 2020年第3期6卷 619-629页

作者： Jinghua Li Mengshu zhu yujin Huang College of Electrical Engineering Guangxi UniversityGuangxi 530005China

Integrated energy systems(IES)are under development to accommodate the widespread penetration of renewable energy into power systems.The universal utilization of coupling components makes the connection between power grids and heat grids even closer.This paper applies energy flow calculations to planning problems and explores a method for selecting coupling components in the integrated electrical and heating systems.This process is based on the analysis of energy flow distribution and the comprehensive indexes,which include operation cost and the penalty cost of wind curtailment and solar energy curtailment.Besides,a selection method of coupling components installation locations based on energy flow calculations is provided.At last,an IES with 5 electrical buses and 5 heating nodes,and a 9-bus electrical power system with a 31-node heating transmission system are chosen to study the specific application problems in detail as well as to elucidate the effectiveness of the proposed method.It turned out that the relevant coupling components and their positions can be selected according to the indexes obtained by integrated electrical-hydraulic-thermal calculation.This proposed method is conducive to the planning of integrated energy systems.

关键词： Classification and location selection coupling components energy flow calculation integrated energy system renewable energy

Aerodynamic characteristics of co-flow jet wing with simple high-lift devices

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Chinese Journal of Aeronautics 2022年第10期35卷 67-83页

作者： Zhenhao zhu Tianhang XIAO Haolin ZHI Shuanghou DENG yujin LU College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Numerical investigations are conducted to explore the aerodynamic characteristics of three-dimensional Co-Flow Jet(CFJ) wing with simple high-lift devices during low-speed takeoff and landing. Effects of three crucial parameters of CFJ wing, i.e., angle of attack, jet momentum and swept angle, are comprehensively examined. Additionally, the aerodynamic characteristics of two CFJ configurations, i.e., using open and discrete slots for injection, are compared. The results show that applying CFJ technique to a wing with simple high-lift device is able to generate more lift,reduce drag and enlarge stall margin with lower energy expenditure due to the super-circulation effect. Increasing the jet intensity can reduce the drag significantly, which is mainly contributed by the reaction jet force. The Oswald efficiency factor is, in some circumstances, larger than one,which indicates the potential of CFJ in reducing induced drag. Compared with clean wing configuration, using CFJ technique allows the aerodynamic force variation less sensitive to the swept angle, and such phenomenon is better observed for small swept angle region. Eventually, it is interesting to know that the discrete slotted CFJ configuration demonstrates a promising enhancement in aerodynamic performance in terms of high lift, low drag and efficiency.

关键词： Active flow control Co-flow jet Continuous injection Discrete injection slot Simple high-lift device

Aerodynamic performance enhancement of co-flow jet airfoil with simple high-lift device

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Chinese Journal of Aeronautics 2021年第9期34卷 143-155页

作者： Haolin ZHI Zhenhao zhu yujin LU Shuanghou DENG Tianhang XIAO College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The present study performed a numerical investigation to explore the performance enhancement of a co-flow jet(CFJ)airfoil with simple high-lift device configuration,with a specific goal to examine the feasibility and capability of the proposed configuration for low-speed take-off and landing.Computations have been accomplished by an in-house-programmed Reynoldsaveraged Navier-Stokes solver enclosed by k-ωshear stress transport turbulence model.Three crucial geometric parameters,viz.,injection slot location,suction slot location and its angle were selected for the sake of revealing their effects on aerodynamic lift,drag,power consumption and equivalent lift-to-drag ratio.Results show that using simple high-lift devices on CFJ airfoil can significantly augment the aerodynamic associated lift and efficiency which evidences the feasibility of CFJ for short take-off and landing with small angle of attack.The injection and suction slot locations are more influential with respect to the aerodynamic performance of CFJ airfoil compared with the suction slot angle.The injection location is preferable to be located in the downstream of the pressure suction peak on leading edge to reduce the power expenditure of the pumping system for a relative higher equivalent lift-to-drag ratio.Another concluded criterion is that the suction slot should be oriented on the trailing edge flap for achieving more aerodynamic gain,meanwhile,carefully selecting this location is crucial in determining the aerodynamic enhancement of CFJ airfoil with deflected flaps.

关键词： Airfoil Co-flow jet Flow control Aerodynamic performance enhancement Simple high-lift device

Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption

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Nano-Micro Letters 2022年第2期14卷 107-123页

作者： Xinci Zhang Yanan Shi Jia Xu Qiuyun Ouyang Xiao Zhang Chunling zhu Xiaoli Zhang yujin Chen Key Laboratory of In‑Fiber Integrated Optics College of Physics and Optoelectronic EngineeringHarbin Engineering UniversityHarbin 150001People’s Republic of China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China

Atomically dispersed metals on N-doped carbon supports(M-N_(xCs)) have great potential applications in various fields.However,a precise understanding of the definitive relationship between the configuration of metal single atoms and the dielectric loss properties of M-N_(xCs) at the atomic-level is still lacking.Herein,we report a general approach to synthesize a series of three-dimensional(3D)honeycomb-like M-N_xC(M=Mn,Fe,Co,Cu,or Ni) containing metal single atoms.Experimental results indicate that 3D M-N_(xCs) exhibit a greatly enhanced dielectric loss compared with that of the NC matrix.Theoretical calculations demonstrate that the density of states of the d orbitals near the Fermi level is significantly increased and additional electrical dipoles are induced due to the destruction of the symmetry of the local microstructure,which enhances conductive loss and dipolar polarization loss of 3D M-N_(xCs),respectively.Consequently,these 3D M-N_(xCs) exhibit excellent electromagnetic wave absorption properties,outperforming the most commonly reported absorbers.This study systematically explains the mechanism of dielectric loss at the atomic level for the first time and is of significance to the rational design of high-efficiency electromagnetic wave absorbing materials containing metal single atoms.

关键词： Metal single atoms Dielectric loss behavior NaCl-templating method Lightweight absorbers Honeycomb-like N-doped nanocarbons

The prior rules of designing Ti_(3)C_(2)T_(x) MXene-based gas sensors

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Frontiers of Chemical Science and Engineering 2021年第3期15卷 505-517页

作者： Yingying Jian Danyao Qu Lihao Guo Yujin Zhu Chen Su Huanran Feng Guangjian Zhang Jia Zhang Weiwei Wu Ming-Shui Yao School of Advanced Materials and Nanotechnology Interdisciplinary Research Center of Smart SensorsXidian UniversityXi’an 710126China Institute for Integrated Cell-Material Sciences Kyoto University Institute for Advanced StudyKyoto UniversityKyoto 606-8501Japan Department of Thoracic Surgery The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China

Working temperature,sensitivity,and selectivity are some of the characteristics of the applied gas sensors.How to design and fabricate an ideal gas sensor working at room temperature is still challenging and attracting lots of interest.Two-dimensional(2D)materials with ultra-thin structure have been demonstrated as a family of ideal candidates to achieve this goal.Among them,Ti_(3)C_(2)T_(x) MXene,a kind of layered sheet synthesized by selectively etching MAX phases materials,shows remarkable potential to be the sensitive materials solely or in a composite.However,their designing rules are still lacking critical thinking from the viewpoint of the intrinsic property of Ti_(3)C_(2)T_(x) MXene based materials.In this article,two critical features,i.e.,the thickness of the sensitive materials,and the scope of the analytes,are elaborated towards Ti_(3)C_(2)T_(x) MXene based gas sensors after characterizing the performance of sensing reducing gases(NH3 and CO)and oxidizing gas(NO2).First,the thinner the Ti_(3)C_(2)T_(x) MXene sensitive layer,the better the sensitivity.Second,the Ti_(3)C_(2)T_(x) MXene based gas sensor is not suitable for strong and moderate oxidation gas due to its ease of oxidation.These two rules are demonstrated,and could be considered with priority both in the future researches and practical applications.

关键词： MXene based sensor prior reducing gases oxidizing gases

Cryogenic 3D printing of dual-delivery scaffolds for improved bone regeneration with enhanced vascularization

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Bioactive Materials 2021年第1期6卷 137-145页

作者： Chong Wang Jiahui Lai Kai Li Shaokui zhu Bingheng Lu Jia Liu yujin Tang Yen Wei School of Mechanical Engineering Dongguan University of TechnologySongshan LakeDongguanGuangdongPR China Department of Mechanical Engineering The University of Hong KongHong Kong SARPR China Department of Orthopedics The Third Affiliated Hospital of Southern Medical UniversityGuangzhouGuangdongPR China Department of Orthopaedics Affiliated Hospital of Youjiang Medical University for NationalitiesBaiseGuangxiPR China Department of Chemistry Tsinghua UniversityBeijingPR China

Three-dimensional(3D)printing has been increasingly employed to produce advanced bone tissue engineering scaffolds with biomimetic structures and matched mechanical strengths,in order to induce improved bone regeneration in defects with a critical size.Given that the successful bone regeneration requires both excellent osteogenesis and vascularization,endowing scaffolds with both strong bone forming ability and favorable angiogenic potential would be highly desirable to induce improved bone regeneration with required vascularization.In this investigation,customized bone tissue engineering scaffolds with balanced osteoconductivity/osteoinductivity were produced via cryogenic 3D printing ofβ-tricalcium phosphate and osteogenic peptide(OP)containing water/poly(lactic-co-glycolic acid)/dichloromethane emulsion inks.The fabricated scaffolds had a hierarchically porous structure and were mechanically comparable to human cancellous bone.Angiogenic peptide(AP)containing collagen I hydrogel was then coated on scaffold surface to further provide scaffolds with angiogenic capability.A sequential release with a quick AP release and a slow but sustained OP release was obtained for the scaffolds.Both rat endothelial cells(ECs)and rat bone marrow derived mesenchymal stem cells(MSCs)showed high viability on scaffolds.Improved in vitro migration and angiogenesis of ECs were obtained for scaffolds delivered with AP while enhanced osteogenic differentiation was observed in scaffolds containing OP.The in vivo results showed that,toward scaffolds containing both AP and OP,the quick release of AP induced obvious angiogenesis in vivo,while the sustained OP release significantly improved the new bone formation.This study provides a facile method to produce dual-delivery scaffolds to achieve multiple functions.

关键词： Cryogenic 3D printing Dual-delivery Osteogenesis Angiogenesis Bone regeneration

Nanographene oxide labeling with (188)~Re

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Nuclear Science and Techniques 2011年第2期22卷 99-104页

作者： ZHANG Xiaoyong LI Jing zhu Ying QI yujin zhu Zhiyong LI Wenxin HUANG Qing Laboratory of Physical Biology Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Nanographene oxide (NGO) is currently being explored for various biomedical applications.However,little information is known about its biological behaviors in vitro and in vivo.For further studying its pharmacokinetics and related biological behaviors in living systems,an effective and convenient tracing method is particularly demanded.In this work,NGO was labeled with radionuclide 188Re (188Re-NGO).To obtain high labeling yield and purity,a number of labeling conditions,including concentration of SnCl2 and ascorbic acid,reaction time and temperature,and pH were optimized,and stability of the 188Re-NGO in vitro and in vivo was evaluated.The results showed that NGO could be effectively labeled with high yield.The purified 188Re-NGO showed high stability in vitro and in vivo.A pretest of NGO biodistribution with single photon emission computed tomography showed that the 188Re-NGO was rapidly taken by organs such as lungs,liver,and spleen.The biodistribution of 188Re-NGO differs significantly from the free radionuclide,indicating that the labeling procedure is highly suitable for investigating its biological behavior in living systems.

关键词：氧化物标签非政府组织铼计算机断层扫描生物学行为放射性核素生物医学应用

Controlled synthesis and shape-dependent electromagnetic wave absorption characteristics of porous Fe_3O_4 sub-micro particles

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Science China(Physics,Mechanics & Astronomy) 2012年第1期55卷 25-32页

作者： CHEN yujin ZHANG Yue XIAOGang WANG TieShi MA Yang zhu ChunLing GAO Peng College of Science Harbin Engineering University Harbin 150001 China College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Porous Fe3O4 sub-micro particles with sphere-like, cube-like and walnut-like morphologies were obtained by a two-step process, and the electromagnetic properties of the Fe3O4 particle/wax composites were investigated. The reflect loss was less than -20 dB for all of the composites in different frequency ranges. The cube-like and walnut-like Fe3O4 composites exhibit improved complex permittivity and permeability and dual-frequency and wide bandwidth absorption characteristics, which is mainly attributed to the larger shape anisotropy. Such a high absorption property indicates that these porous Fe3O4 particles with various morphologies are very promising for electromagnetic wave absorptive materials.

关键词：纳米Fe3O4粒子电磁波吸收材料形状各向异性吸收特性控制合成多孔微颗粒复合材料

Two New Species of Protocedroxylon Gothan(Pinaceae) from the Middle Jurassic of Eastern Inner Mongolia, NE China

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 1685-1699页

作者： ZHANG yujin TIAN Ning zhu Zhipeng WANG Yongdong WU Xinwei ZHANG Zhibin ZHANG Chao SI Qiuliang MA Yongfei Shenyang Center of the Geological Survey CGS College of Earth Sciences Jilin University College of Palaeontology Shenyang Normal University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyCAS Center for Excellence in Life and Palaeoenvironment Chinese Academy of Sciences

Two new coniferous wood taxa, Protocedroxylon zhangii sp. nov. and P. zhalantunense sp. nov., are described from the Middle Jurassic Wanbao Formation in Zhalantun City, Inner Mongolia, NE China. The new discovery represents the first record of petrified wood in the Wanbao Formation, and contributes to further understanding the floral composition, especially that of the forest, of the Wanbao Formation. Anatomically, the two new species are characterized by having a mixed type of radial pitting and Abietineentüpfelung. In extant conifers, Abietineentüpfelung is considered to be characteristic of the wood of Pinaceae. The new discovery further indicates that the first occurrence of Abietineentüpfelung in conifer-like wood should be earlier than the Kimmeridgian. The palaeolatitudinal distribution pattern of Protocedroxylon indicates that the genus is a palaeobiogeographically consistent group, which was probably restricted to wetter and cooler temperate climates. In combination with distinct growth rings, the occurrence of Protocedroxylon suggests that a cool temperate and seasonal climate might have prevailed during the sedimentation period of the Wanbao Formation in eastern Inner Mongolia, NE China. Such a view is also in agreement with the palaeoclimatic conditions indicated by the plant megafossils of the Wanbao Formation.

关键词： Protocedroxylon Pinaceae Wanbao Formation Middle Jurassic Inner Mongolia

韩孟诗派最后十年的孤芳与微澜——以备受争议的《石鼎联句》为中心

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北京师范大学学报（社会科学版） 2023年第4期 108-122页

作者：孙羽津中共中央党校(国家行政学院)文史部北京100091

联句创作是韩孟诗派发展的动力机制,是奇诡诗风的重要表征。综观《石鼎联句》千年阐释史,朱熹-魏源一派“去序考诗”的研究路径颇具价值。沿此详加统计分析,不难窥见韩愈联句区别于其他唐人联句的形式特征,以及富含政治讽谕和人性反思... 详细信息

联句创作是韩孟诗派发展的动力机制,是奇诡诗风的重要表征。综观《石鼎联句》千年阐释史,朱熹-魏源一派“去序考诗”的研究路径颇具价值。沿此详加统计分析,不难窥见韩愈联句区别于其他唐人联句的形式特征,以及富含政治讽谕和人性反思的意义空间,而《石鼎联句》适与韩愈联句的各项特征高度吻合,联句作者、本事及作年遂得一一落实。由此可见,《石鼎联句》不仅忠实继承了韩孟诗派鼎盛时期的联句形制,而且在最具难度的借物托讽一脉上着意用工,踵事增华,突破了双人联句平分秋色的基本格局,孕育着韩孟诗派结构性变革及其与古文运动融合发展的美妙契机,可谓韩孟诗派最后十年的重大关捩。

关键词：韩孟诗派韩愈联句体《石鼎联句》奇诡诗风