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Experimental study on pressure and temperature distributions for low mass flux steam jet in subcooled water

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Science China(Technological Sciences) 2009年第6期52卷 1493-1501页

作者： JunJie Yan XinZhuang Wu daotong Chong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A low mass flux steam jet in subcooled water was experimentally *** transition of flow pattern from stable jet to condensation oscillation was observed at relatively high water *** axial total pressures,the axial and radial temperature distributions were measured in the jet *** results indicated that the pressure and temperature distributions were mainly influenced by the water *** correlations corrected with water temperature were given to predict the dimen-sionless axial pressure peak distance and axial temperature distributions in the jet region,the results showed a good agreement between the predictions and ***,the self-similarity property of the radial temperature was obtained,which agreed well with Gauss *** present work,all the dimensionless properties were mainly dependent on the water temperature but weakly on the nozzle size under a certain steam mass flux.

关键词： dimensionless self-similarity steam jet condensation temperature distribution total pressure

血管内皮生长因子165对心肌样细胞增殖的影响

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济宁医学院学报 2017年第1期40卷 16-20,24页

作者：孙丰年王彦富张慧玲郭道通韩朝鑫李清贤济宁医学院济宁272067 济宁医学院附属医院济宁272029

目的探讨携带血管内皮生长因子165(vascular endothelial growth factor 165,VEGF165)基因的腺病毒(Ad-VEGF165)转染至心肌样细胞对其表达VEGF165及增殖活性的影响。方法提取、培养、鉴定骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs);体外诱导BMSCs为心肌样细胞。构建携带VEGF165基因的腺病毒载体并转染至心肌样细胞;实验分为3组:Ad-VEGF165转染心肌样细胞作为实验组;未携带VEGF165基因的腺病毒转染心肌样细胞作为空载体组;未处理的心肌样细胞作为空白对照组。在1周内检测各组VEGF165的表达及心肌样细胞的增殖活性。结果 VEGF165在实验组可正常表达,与空载体组、对照组相比差异具有统计学意义(P<0.05);心肌样细胞增殖活性在实验组中最佳,显著优于空载体组和对照组(P<0.05)。结论成功将Ad-VEGF165转染至心肌样细胞,且表达的VEGF165可增强心肌样细胞的增殖活性。

关键词： VEGF165 骨髓间充质干细胞心肌样细胞心肌梗死

A Review on Thermal Design of Liquid Droplet Radiator System

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Journal of Thermal Science 2021年第2期30卷 394-417页

作者： CHONG daotong ZHU Maoguo ZHAO Quanbin CHEN Weixiong YAN Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Liquid Droplet Radiator (LDR) system is regarded as a quite promising waste heat rejection system for aerospace engineering.A comprehensive review on the state-of-the-art of LDR system was carried *** thermal design considerations of crucial components such as working fluid,droplet generator and collector,intermediate heat exchanger,circulating pump and return pipe were *** state-of-the-art of existing mathematical models of radiation and evaporation characteristics of droplet layer from literatures were ***,thermal designs of three LDR systems were *** weight and required planform area between the rectangular and triangular LDR systems were respectively compared and the evaporation models for calculating the mass loss were *** on the review,some prospective studies of LDR system were put forward in this paper.

关键词： Liquid Droplet Radiator(LDR)system thermal design considerations radiative heat transfer evaporation loss

Preliminary design of an SCO_(2) conversion system applied to the sodium cooled fast reactor

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Frontiers in Energy 2021年第4期15卷 832-841页

作者： Hongyi YANG Xiaoyan YANG Jun YANG Quanbin ZHAO Xiaokun WANG daotong CHONG Chanjuan TANG Chengyuan JIANG China Institute of Atomic Energy Beijing 102413China

The supercritical carbon dioxide(SCO_(2))Brayton cycle has become an ideal power conversion system for sodium-cooled fast reactors(SFR)due to its high efficiency,compactness,and avoidance of sodiumwater *** this paper,the 1200 MWe large pool SFR(CFR1200)is used as the heat source of the system,and the sodium circuit temperature and the heat load are the operating boundaries of the cycle *** performance of different SCO_(2) Brayton cycle systems and changes in key equipment performance are *** study indicates that the inter-stage cooling and recompression cycle has the best match with the heat source characteristics of the SFR,and the cycle efficiency is the highest(40.7%).Then,based on the developed system transient analysis program(FR-Sdaso),a pool-type SFR power plant system analysis model based on the inter-stage cooling and recompression cycle is *** addition,the matching between the inter-stage cooling recompression cycle and the SFR during the load cycle of the power plant is *** analysis shows that when the nuclear island adopts the flow-advanced operation strategy and the carbon dioxide flowrate in the SCO_(2) power conversion system is adjusted with the goal of maintaining the sodium-carbon dioxide heat exchanger sodium side outlet temperature unchanged,the inter-stage cooling recompression cycle can match the operation of the SFR very well.

关键词： sodium-cooled fast reactor(SFR) supercritical carbon dioxide(SCO_(2)) brayton cycle load cycle

Water Evaporation Triggered Self-Assembly of MXene on Non-Carbonized Wood with Well-Aligned Channels as Size-Customizable Free-Standing Electrode for Supercapacitors

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Energy & Environmental Materials 2023年第5期6卷 347-354页

作者： Weimin Chen Zhao Li Feng Jiang Min Luo Kai Yang daotong Zhang Wangwang Xu Chaozheng Liu Xiaoyan Zhou Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry University International Innovation Center for Forest Chemicals and Materials Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials Nanjing 210037China Sustainable Functional Biomaterials Laboratory Department of Wood ScienceThe University of British ColumbiaVancouver BC V6T 1Z4Canada School of Renewable Natural Resources Louisiana State University Agricultural CenterBaton Rouge LA 70803USA

Herein,non-carbonized wood-based electrodes and separators with well-aligned channels and excellent mechanical properties are developed for *** enhance the conductivity and boost the capacitance,Ti_(3)C_(2)(MXene)nanosheets with high electrical conductivity and excellent electrochemical activity are loaded into the wood cells via self-assembly triggered by fast evaporating water in Ti_(3)C_(2)*** the assistance of positive charged polydopamine microspheres with large surface area,the self-restacking of Ti_(3)C_(2)nanosheets can be avoided and the high mass loading(50 wt%)can be achieved due to the extra driving force for Ti_(3)C_(2)*** from the conductive Ti_(3)C_(2)nanosheets with massive active sites and the multiple well-aligned channels in wood with efficient transportation pathways for charge carriers,the as-designed free-standing electrode shows a large areal capacitance of 1060 mF cm^(-2)at 0.5 mA cm^(-2)and high capacitance retention of 67%at 10 mA cm^(-2).Also,this electrode is highly size-customizable,showing a good ability to be industrially processed into various shapes and ***,an all-wood based supercapacitor with Ti_(3)C_(2)/wood composites as two layers of electrodes and a wood slice as the separator is fabricated,presenting a high energy density of 10.5μW h cm^(-2)at 389.9μW cm^(-2).

关键词： free-standing electrode MXene nanosheets polydopamine microspheres supercapacitor wood slice with well-aligned channels

Active,compact,wideband,receiving filtenna with power adaptation for space-limited wireless platforms

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Chinese Journal of Aeronautics 2022年第8期35卷 7-11页

作者： LI daotong YU Yaqing TANG Ming-Chun LI Dajiang MU Dongmei LI Mei School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China Institute of Wireless Mobile Information Technology School of Electronic Engineering of Beijing UniversityPosts and TelecommunicationsBeijing 100876China

An active,compact,wideband,receiving filtenna with power adaptation for space-limited wireless platforms is *** organically combining a filtering antenna and a Variable Gain Amplifier(VGA),the proposed co-designed active filtenna is *** power adaptation is empowered by controlling gain of the VGA unit.A demonstrated prototype with a compact overall size is fabricated,assembled and *** performances are ***,in any condition,the proposed active filtenna displays outstanding impedance matching(|S_(11)|<−10 dB)and high passband skirt selectivity at upper and lower stopbands(Selectivity≥170 dB/GHz).

关键词： Amplifier Compact Power adaptation VGA Wideband

Interface control for pure ultraviolet electroluminescence from nano-ZnO-based heterojunction devices

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Science Bulletin 2018年第1期63卷 38-45页

作者： daotong You Chunxiang Xu Feifei Qin Zhu Zhu A.Gowri Manohari Wei Xu Jie Zhao Wei Liu State Key Laboratory of Bioelectronics School of Biological Science & Medical Engineering Southeast University

Realization of pure and stable ultraviolet electroluminescence(UV EL) of ZnO light-emitting diode(LED)is still a challenging issue, due to complicated defects of intrinsic ZnO and the corresponding device interfaces. In this paper, we demonstrated a simple & feasible method to fabricate n-ZnO/AlN/p-GaN heterojunctions light-emitting devices. First, the vertically aligned ZnO nanorods(NRs) have been prepared as high quality active layer, and the nanostructured heterojunction LED arrays were constructed by directly bonding ZnO NRs onto AlN-coated p-GaN wafer. By optimizing the AlN layer thickness to be 20 nm, a strong and pure ultraviolet emission located at 387 nm can be observed. The energy band alignment of n-ZnO/AlN(20 nm)/p-Ga N heterojunction LED has been studied by using X-ray photoelectron spectroscopy(XPS), the valence band offset between AlN and GaN was calculated to be 0.34 eV. On the other side, the conduction band offset(as large as 3.28 eV) between Al N and ZnO can block the flow of electrons from ZnO top-GaN. Thus, electron-hole recombination takes place in the ZnO layer, and a pure UV EL could be observed. Our results provide a significant approach toward future of pure ultraviolet optoelectronic LEDs.

关键词： ZnO nanorods AlN insulator layer Interface control Pure ultraviolet light emitting diode Directly bonding

Plasmon-enhanced self-powered GaN/ZnTe core/shell nanopillar array photodetector

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Nano Research 2024年第6期17卷 5569-5577页

作者： Jianqi Dong Dongqi Zhang Yi Ma daotong You Jinping Chen Bin Liu Xingfu Wang Zengliang Shi Chunxiang Xu State Key Laboratory of Digital Medical Engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials National Laboratory of Solid State MicrostructuresSchool of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Institute of Photonics Technology Jinan UniversityGuangzhou 510632China Guangdong Engineering Research Center of Optoelectronic Functional Materials and Devices Institute of SemiconductorsSouth China Normal UniversityGuangzhou 510631China

Nanostructure photodetectors,as the core component of optoelectronic devices,are mainly focused on the precise preparation of mixed-component nano-heterostructures and the realization of zero power consumption ***,we successfully fabricated n-GaN/p-ZnTe core/shell nanopillar array and realized self-power ultraviolet/violet *** radial heterojunction nanodevice reveals high light-dark current ratio of 104 at 0 V bias,indicating effective carriers’*** more,by integrating plasmonic effect,the responsivity and detectivity of the Au nanoparticles decorated device are increased from 3.85 to 148.83 mA/W and 4.45×1011 to 2.33×1012 Jones under 325 nm UV light *** the rise and the fall time are decreased 1.3 times and 6.8 times under 520 nm visible light irradiation at 0 V *** high photocurrent gain is derived from that the oscillating high-energy hot electrons in Au nanoparticles spontaneously inject into the ZnTe conduction band to involve the photodetection *** work presents an effective route to prepare high-performance self-power photodetector and provides a promising blueprint to realize different functional photoelectronic devices based on core/shell nanostructure.

关键词： GaN/ZnTe core/shell nanopillar array self-power ultraviolet/visible photodetector plasmonic effect

Operando optical fiber monitoring of nanoscale and fast temperature changes during photo-electrocatalytic reactions

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Light(Science & Applications) 2022年第9期11卷 2086-2097页

作者： ZHI LI YONGGUANG XIAO FU LIU XIANGYU YAN daotong YOU KAIWEI LI LIXI ZENG MINGShan ZHU GAOZHI XIAO JACQUES ALBERT TUAN GUO Guangdong Key Laboratory of Environmental Pollution and Health School of EnvironmentJinan UniversityGuangzhou 511443China Guangdong Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhouGuangdong 511443China Department of Electronics Carleton UniversityOttawa K1S 5B6Canada Advanced Electronics and Photonics Research Center National Research Council of CanadaOttawa K1A 0R6Canada Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

In situ and continuous monitoring of thermal effects is essential for understanding photo-induced catalytic processes at catalyst's ***,existing techniques are largely unable to capture the rapidly changing temperatures occurring in sub-μm layers at liquid-solid interfaces exposed to *** address this,a sensing system based on a gold-coated conventional single-mode optical fiber with a tilted fiber Bragg grating inscribed in the fiber core is proposed and *** spectral transmission from these devices is made up of a dense comb of narrowband resonances that can differentiate between localized temperatures rapid changes at the catalyst's surface and those of the *** using the gold coating of the fiber as an electrode in an electrochemical reactor and exposing it to light,thermal effects in photo-induced catalysis at the interface can be decoded with a temperature resolution of 0.1℃and a temporal resolution of 0.1 sec,without perturbing the catalytic operation that is measured *** a demonstration,stable and reproducible correlations between the light-to-heat conversion and catalytic activities over time were measured for two different catalysis processes(linear and nonlinear).These kinds of sensing applications are ideally suited to the fundamental qualities of optical fiber sensors,such as their compact size,flexible shape,and remote measurement capability,thereby opening the way for various thermal monitoring in hard-to-reach spaces and rapid catalytic reaction processes.

关键词： catalysis catalyst thereby