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Graphene oxide-derived single-atom catalysts for electrochemical energy conversion

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Rare Metals 2022年第5期41卷 1703-1726页

作者： Jian-Bin Liu Hai-sheng gong gong-Lan Ye Hui-Long Fei State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Sustainable electrochemical energy conversion is considered as a promising solution to energy crises and environmental issues. Owing to their maximized utilization efficiency and excellent catalytic performance, single-atom catalysts(SACs) have obtained tremendous attention in the field of electrochemical energy conversion. In the last few years, graphene oxide(GO) has been considered to be a promising precursor for fabricating graphene-supported SACs due to its advantageous features such as large surface area, high density of intrinsic defects, and scalability. In this review, the recent advances in the preparation of graphene oxide-derived single-atom catalysts(GO-SACs) and their diverse electrochemical applications are ***, the synthetic strategies of GO-SACs are discussed with focuses on the advantages and shortages of each method. Subsequently, the electrochemical applications of GO-SACs in various energy conversion processes,including the oxygen reduction reaction(ORR), oxygen evolution reaction(OER), hydrogen evolution reaction(HER), nitrogen reduction reaction(NRR), and carbon dioxide reduction reaction(CO;RR), are discussed in detail. Finally, the remaining challenges and future prospects in the fabrication and application of GO-SACs are presented.

关键词： Single-atom catalysts Graphene oxide Electrocatalysis Energy conversion

Dynamical separation of rigid bodies in supersonic flow

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Science China(Technological Sciences) 2015年第12期58卷 2110-2121页

作者： LI Tao SUI JingXia gong sheng WU ChuiJie School of aeronautics and astronautics Dalian university of technology School of energy and power engineering Dalian university of technology

A computational investigation of the unsteady separation behavior of rigid bodies in Mach-4 flow is carried out. Two rigid bodies, a sphere and a cube, initially stationary, centroid axially aligned, are released and thereafter fly freely according to the aerodynamic forces experienced. During the separation process, the smaller cube can experience different types of movement and our principal interest here is the non-dimensional transverse velocity of it. The separation behavior is investigated for interactions between a sphere and a cube with different mass ratio and a constant initial distance between them. The qualitative separation behavior and the final transverse velocity of the small body are found to vary strongly with the mass ratio but less sensitive to the initial distance between the two bodies. At a critical mass ratio for a given distance, the smaller body transit from entrainment within the flow region bounded by the larger body's shock to expulsion and the accumulated transverse velocity of the small body is close to maximum. This phenomenon is the so-called ‘shock-wave surfing' phenomenon noted by Laurence & Deiterding for two spheres at hypersonic Mach numbers. Then we investigate the separation behavior of a sphere interaction with a rotary cube and with a non-rotary cube for a given mass ratio and different distance between them. The rotary is found to increase the likelihood of ‘surfing'. Only at a certain initial distance for a given mass ratio the rotary effect of cube can be neglectable.

关键词： separation behavior flow-structure interactions shock waves

Lidar observation campaigns on diurnal variations of the sodium layer in Beijing and Wuhan, China

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Science China Earth Sciences 2015年第8期58卷 1377-1386页

作者： gong ShaoHua YANG GuoTao CHENG XueWu gong Shun sheng XU JiYao LI FaQuan gong Wei WANG JiHong School of Physics and Electronics Engineering Hainan Normal University State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences Laboratory of Optoelectronics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University

Based on observations from daytime lidars in eastern China,diurnal cycles of the sodium layer over Wuhan(30.5°N,114.6°E)and Beijing(40.5°N,116°E)are *** variations of Na density,root mean square(RMS)layer width,and centroid height of the sodium layer are *** reveal that the large diurnal cycles of the sodium layer are controlled mainly by 24-hr oscillations at the two observation *** diurnal variation of the sodium layer over Wuhan was modulated mainly by tidal perturbations during the lidar observation ***,the diurnal variation over Beijing was controlled principally by photoionization and photochemistry effects during another campaign,and there was little evidence of direct tidal *** comparisons suggest that the diurnal variation of the sodium layer perhaps has obvious regional characteristics across *** variation can be either controlled mainly by tidal perturbations or by photoionization and photochemistry effects in different seasons.

关键词： daytime lidar diurnal variations of the sodium layer photochemistry effects tidal perturbations

Netrin-1:the new tumor markers in renal clear cell carcinoma

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Asian Pacific Journal of Tropical Medicine 2015年第6期8卷 488-492页

作者： Bai-sheng gong Qiang Feng Uropoiesis Surgical Department Sichuan Academy of Medical Sciences Sichuan Province People's Hospital

Objective:To explore the expression of Netrin-1 protein in human renal clear cell carcinoma(RCCC) and the relationships between *** and ***:72 cases of RCCC admitted in our hospital from 2008 June to 2009 June and their adjacent tissues were selected for *** included 30 cases in stage Ⅰ-Ⅱ.42 cases in stage Ⅲ-Ⅳ;9 cases in grade Ⅰ.9 cases in grade Ⅱ.40 cases in grade Ⅲ and 14 cases in grade Ⅳ.All cases were followed up for more than 5 *** analysis lines were made by Kaplan—Meier method and the difference between groups was tested by the Log-rank *** expression of Netrin-1 protein was detected by immunohistochemistry staining and its clinical significance was ***:Renal clear cell carcinoma:51 cases in high expression of Netrin-1and 21 cases in low expression,normal tissues:12 cases in high expression of Netrin-1and 60 cases in low expression,the difference between the two groups is significant(x^2=42.921,P<0.01).The difference of the expression of Netrin-lin Fuhrman grade and AJCC clinical stage is significant(x^2=8.000.x^2=6.203:P<0.05).The 5-year survival rate in low protein expression group and in high protein expression group was 79% (17/21) and 62% (32/51).The survival curve had different trend,with no significant difference between groups(x^2=1.360.P=0.245).Conclusions:Netrin-1 protein plays an important role in the development of *** might be a new specific tumor marker of *** might become a new target in treatment of RCCC.

关键词： Netrin-1 Renal clear cell carcinoma

Preoperative 3D reconstruction and fluorescent indocyanine green for laparoscopic duodenum preserving pancreatic head resection:A case report

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World Journal of Clinical Cases 2023年第4期11卷 903-908页

作者： Xiao-Li Li Lian-sheng gong Department of General Surgery Xiangya HospitalCentral South UniversityChangsha 410008Hunan ProvinceChina

BACKGROUND Duodenum-preserving pancreatic head resection(DPPHR)is the choice of surgery for benign or low-grade malignant tumors of the pancreatic *** DPPHR(LDPPHR)procedure can be improved by preoperative 3D model reconstruction and the use of intravenous indocyanine green fluorescent before surgery for real-time navigation with fluorescent display to guide the surgical dissection and prevention of from injury to vessels and biliary *** SUMMARY Here we report the successful short-and long-term outcomes after one year following LDPPHR for a 60-year lady who had an uneventful recovery and was discharged home one week after the *** There was no bile leakage or pancreatic leakage or delayed gastric *** histopathology report showed multiple cysts in the pancreatic head and localized pancreatic intraepithelial tumor *** resected margin was free of tumor.

关键词： Duodenum-preserving pancreatic head resection Fluorescent navigation Laparoscopic 3D model reconstruction Case report

THE BLOCH CONSTANT OF LOCALLY BIHOLOMORPHIC MAPPINGS ON BOUNDED SYMMETRIC DOMAINS

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Chinese Annals of Mathematics,Series B 1996年第3期17卷 271-278页

作者： gong sheng(Department of Mathematics, University of Science and Technology of China, Hefei 230026, China) UNIV SCI & TECHNOL CHINA DEPT MATHHEFEI 230026PEOPLES R CHINA

The estimations of the bounds of the Bloch constant of locally biholomorphic mappingson irreducible bounded symmetric domains are given. When the domain is a unit circle, theestimation of the lower bounds is just the ... 详细信息

关键词： Bounded symmetric domain Bloch mapping Bloch constant,Locally biholomorphic mapping

Microstructure of Steel 5Cr21Mn9Ni4N Alloyed by Rare Earth

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Journal of Iron and Steel Research International 2006年第2期13卷 40-44页

作者： YU Shi-chang ZHU Qiu-hua WU Shen-qing gong You-jun gong Yuan-sheng LIAN Ming-sheng YE Gang CHENG Yi-jun Department of Material Science and Engineering Southeast University Nanjing 210096 Jiangsu China Technology Center Jiangsu Shenyuan Special Steel Company Xinghua 225722 Jiangsu China

The microstructure, composition and shape of precipitated phase under as-cast and finished product state of 5Cr21Mn9Ni4N steel with different rare earth （RE） amount were studied. Mechanical properties of 5Cr21Mn9Ni4N steels withont RE addition and with RE added by 0. 2% in mass percent were tested respectively. The results indicate that the solid solution amount of RE is about 10^-6 -10^-5 order of magnitude in 5Cr21Mn9Ni4N steel. Dendrite of as-cast condition is refined obviously and dimension of interstitial phase is shortened when RE is added by 0.10%-0.20%. But the microstructure will be coarser if surplus RE is added. Precipitated phase under finished product state distributes evenly in nearly same size with RE added by 0. 2% which leads to a largely improved high temperature mechanical property.

关键词： rare earth 5Cr21Mn9Ni4N steel microstructure precipitated phase

Synthesis and Characterization of Electroless Ni-P/Ni-Mo-P Duplex Coating with Different Thickness Combinations

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Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 1008-1016页

作者： gong-sheng Song Shuo Sun Zhong-Chi Wang Cheng-Zhi Luo Chun-Xu Pan School of Physics and Technology and MOE Key Laboratory of Artificial Micro- and Nano-StructuresWuhan University School of Science Shenyang University of Technology Center for Electron Microscopy Wuhan University

In this work, a novel duplex Ni-P/Ni-Mo-P coating upon the aluminum（Al） substrate was synthesized via an electroless plating, i.e., the binary Ni-P coating as a transition layer and the ternary Ni-Mo-P coating on the top. It was found that the duplex coating was of a high hardness,large elastic modulus,low porosity and excellent corrosion resistance. In addition, experimental results revealed that for a total 20 μm coating thickness, the duplex coating with a 7 μm of the Ni-Mo-P coating exhibited the best corrosion resistance in 0.5 mol/L sulfuric acid solution, which was attributed to its compact structure and low porosity. This duplex Ni-P/Ni-Mo-P coating with a thin ternary Ni-Mo-P layer is expected to solve the problem of low deposition rate of ternary alloy coating and thereby may expand applications of Al and its alloys in the fields of machine manufacture and corrosion environment.

关键词： Electroless plating Aluminum (Al) Porosity Ni-P/Ni-Mo-P duplex coating Corrosion resistance

Oxidation and thermal fatigue of EB-PVD thermal barrier coatings on tube superalloy substrate

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中国有色金属学会会刊：英文版 2006年第A02期16卷 10-13页

作者： GAO Yu ZHANG Chun-xia ZHOU Chun-gen gong sheng-kai XU Hui-bin Department of Materials Science and Engineering B eijing University of Aeronautics and Astronautics Beijing 100083 China

Two-layer structured thermal barrier coatings (TBCs) (NiCoCrAlY (bond coat)+(6%-8%, mass fraction) Y2O3-stabilized ZrO2(YSZ top coat)) were deposited by electron beam physical vapor deposition (EB-PVD) on tube superalloy substrates. The samples were investigated by isothermal oxidation and thermal shock tests. It is found that the mass gains of the,substrate with and 2 without TBCs are 0.165 and 7.34 mg/cm(2), respectively. So the TBCs system is a suitable protection for the substrate. In thermal shock tests the vertical cracks initiate at the top coat and grow into the bond coat, causing the oxidation of the bond coat along the cracks. Failure of the TBCs system occurs by the spallation of the YSZ from the bond coat, and some micro-cracks are found at the location where the fragment of the YSZ top coat spalled from.

关键词：超耐热合金管状基质 EB-PVD 电子束物理汽相淀积氧化热冲击热障涂层热疲劳