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Rare Metals 2016年第7期35卷 513-519页

作者： kai Yan Hong-Bo Guo Hui Peng Sheng-kai gong School of Materials Science and Engineering Beihang University Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang University

NiA1 intermetallic compounds attract increas- ing attention for high-temperature applications due to their combination of excellent properties, especially as metallic protective coatings on superalloys or as bond coats in thermal barrier coatings （TBCs）. Oxidation behaviour of the β-NiA1Hf coatings prepared by electron beam physical vapour deposition （EB-PVD） was investigated at 1100 ℃ for short time and 100h in 20% 02＋Ar and 15 % H20 ＋ Ar, respectively. The results of mass changes re- veal that the addition of minor reactive element Hf sig- nificantly improves the cyclic oxidation resistance of the 13- NiA1 coatings in both dry and humid atmospheres. During the initial oxidation stage, water vapour retards the phase transformation from 0-A1203 to a-A1203. Moreover, com- pared with the case in dry atmosphere, water vapour sig- nificantly reduces the surface roughness of the oxide scales formed on EB-PVD β-NiA1Hf coatings after 100 h cyclic oxidation, which corresponds with the difference of surface morphologies of the oxide scales.

关键词： β-NiA1Hf coatings Water vapour Oxidation Phase transformation Roughness

Sub-micron Co-Al_(2)O_(3) composite powders prepared by room-temperature ultrasonic-assisted electroless plating

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Rare Metals 2022年第6期41卷 1968-1971页

作者： Liu Zhu Hong-Bo Guo Sheng-kai gong School of Materials Science and Engincering Beihang UniversityBeijing 100191China Department of Mechanical Engineering Taizhou UniversityTaizhou 318000China

Sub-micron Co-Al_(2)O_(3)composite powders were synthesized by ultrasonic-assisted electroless plating process at room temperature with a one-step activating method *** effect of process parameters on plating rate,Co content,and the uniformity of cobalt layer was analyzed by transmission electron microscopy(TEM).The results show that as the initial pH values of plating bath increase,the plating rate *** plating rate declines as the load increases when the load of powders is less than 12 g·L^(-1),but increases when the load is greater than 12 g·L^(-1).The relative Co content of the Co-Al_(2)O_(3) powder declines with the powder load increasing.

关键词： Ultrasonic-assisted electroless plating Co-Al_(2)O_(3)compositepowders Load

Suppression of GSK3β by ERK mediates lipopolysaccharide induced cell migration in macrophage through β-catenin signaling

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Protein & Cell 2012年第10期3卷 762-768页

作者： kai gong Fangfang Zhou Huizhe Huang Yandao gong Long Zhang Department of Biological Sciences and Biotechnology Tsinghua UniversityBeijing 100084China Leiden University Medical Center Department of Molecular Cell BiologyLeidenthe Netherland Faculty of Basic Medical Sciences Chongqing Medical UniversityChongqing 400016China

We investigate the role of β-catenin signaling in the response of macrophage to lipopolysaccharide(LPS)using RAW264.7 *** rapidly stimulated cytosolic β-catenin accumulation.β-catenin-mediated transcription was showed to be required for LPS induced gene expression and cell ***,ERK activation-primed GSK3β inactivation by Akt was demonstrated to mediate the LPS induced β-catenin ***,our findings suggest that suppression of GSK3β by ERK stimulatesβ-catenin signaling therefore contributes to LPS induced cell migration in macrophage activation.

关键词： LPS ERK GSK3β β-catenin cell migration

Investigations on Fluid Resonance Within A Narrow Gap Formed by Two Fixed Bodies with Varying Breadth Ratios

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China Ocean Engineering 2023年第6期37卷 962-974页

作者： gong Shu-kai GAO Jun-liang MAO Hong-fei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300350China College of Ocean Engineering and Energy Guangdong Ocean UniversityZhanjiang 524000China Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching Guangdong Ocean UniversityZhanjiang 524088China

The resonant motion of the fluid inside a narrow gap between two fixed boxes induced by incident regular waves with various wave heights is investigated by adopting a two-dimensional numerical wave flume based on an opensourced CFD package,*** two boxes have identical draft and height,but the upstream box has a variable *** article focuses on the influences of the breadth ratio,defined as the ratio of the breadth of the upstream box to that of the downstream box,on the following three aspects of hydrodynamic characteristics of gap resonance:(1)the wave height amplifications inside the gap,and in front and at the rear of the structure system,(2)the reflection,transmission,and energy loss coefficients of the structure system,and(3)the response and damping time of the fluid *** is found that the fluid resonant frequency,the amplification factor of the resonant wave height inside the gap and the maximum energy loss coefficient of the structure system are shown to gradually decrease with the increase of the breadth *** response time of gap resonance is shown to first increase and then decrease with the breadth ratio overall,regardless of the incident wave height,and the configuration that the two boxes have the same breadth would bring the largest response time of gap resonance.

关键词： gap resonance wave amplification varying breadth ratios OpenFOAM

Study on the inter-village space of a traditional village group in Huizhou Region:Hongguan Village group as an example

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Frontiers of Architectural Research 2020年第3期9卷 588-605页

作者： Yifei Pei kai gong Jiawei Leng School of Architecture Southeast UniversityNanjing 210096China

Village groups are a common phenomenon in Huizhou Region,a historical region in eastern China where shared inter-village spaces play important roles in linking *** study analyzes the spatial layouts and characteristics of the inter-village space in the Hongguan village group in Wuyuan County,Jiangxi Province.A comprehensive literature review and the results of field research,qualitative analysis,and quantitative analysis prove that the regional spatial structure is maintained among inter-village space,landmarks,villagers,and villages within the village *** a summarized analysis of nine research slices,this study complements previous Huizhou Village *** provides valuable information for the preservation of traditional villages and reveals the hidden rules,potential order,and social meaning of inter-village spaces.

关键词： Huizhou Traditional village Village group Inter-village space Landmark

Deposition of TiN/TiAlN multilayers by plasma-activated EB-PVD:tailored microstructure by jumping beam technology

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Rare Metals 2017年第8期36卷 651-658页

作者： Guo-Yuan Yang Hui Peng Hong-Bo Guo Sheng-kai gong School of Materials Science and Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang UniversityBeijing 100191China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) Beihang UniversityBeijing 100191China

Plasma-activated electron beam-physical vapor deposition（EB-PVD）was used for depositing nitride multilayer coatings in this *** from the conventional coating methods,the multilayers were obtained by manipulating electron beam（EB）to jump between two different evaporation sources alternately with variable frequencies（jumping beam technology）.The plasma activation was generated by a hollow cathode plasma *** deposition process was demonstrated by means of tailoring TiN/TiAlN multilayers with different modulation periods（M1：26.5 nm,M2：80.0 nm,M3：6.0 nm,M4：4.0 nm）.The microstructure and hardness of the multilayer coatings were comparatively studied with TiN and TiAlN singlelayer *** columnar structure of the coatings（TiN,TiAlN,M1,M2）is replaced by a glassy-like microstructure when the modulation period decreases to less than 10 nm（M3,M4）.Simultaneously,superlattice growth *** the decrease of modulation period,both the hardness and the plastic deformation resistance（H^3/E^2,H-hardness and E-elastic modulus）increase.M4coating exhibits the maximum hardness of（49.6±2.7）GPa and the maximum plastic deformation resistance of^0.74 GPa.

关键词： Nano-multilayer coatings Superlattice Plasmaactivation TiN/TiAlN EB-PVD Hardness

Complementary Operations of Multi-renewable Energy Systems with Pumped Storage

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1866-1880页

作者： Zean Zhu Lingling Wang Xu Wang Chuanwen Jiang Shichao Zhou kai gong Key Laboratory of Control of Power Transmission and conversion Shanghai Jiao Tong UniversityShanghai 200240China

Complementarity is an important attribute among different renewable energy sources(RESs).A multi-renewable energy system(MRES)offers an alternative to aggregate diverse RESs and can ensure the best attributes of their mutual ***,few papers conduct convincing research into the complementary operation of a *** paper investigates the complementarities in a MRES that contains wind,photovoltaic,run-off hydro,pumped storage power plants and incorporates complementarity into the optimal operation of a *** complementarity is theoretically summarized and first classified into two categories:natural and *** effectively capture the uncertainty and complementarity of RESs,the time-dependent clustering simulation technique is employed to generate their *** equivalent runoff hydropower plant index is proposed,based on which a novel complementary operation model,that considers volatility and self-sufficient adequacy,is *** are presented and compared in a case study,which demonstrate the validity and scalability of the proposed methodology,reveals the complementarities under multiple time-scales,and illustrates the significance of complementary operations.

关键词： Complementarity multi-renewable energy system optimal operation multi time-scale fuzzy-c means clustering

Existence patterns of Dy in β-NiAl from first-principles calculations

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Rare Metals 2016年第4期35卷 356-360页

作者： Tian Zhang Hong-Bo Guo Sheng-kai gong Hui-Bin Xu School of Materials Science and Engineering Beihang University

Intermetallic compound β-NiA1 is a promising material in high temperature applications due to its high melting temperature, high strength, low density, and good oxidation resistance. However, its application remains limited because of its relatively poor cyclic oxidation resistance. Addition of reactive element （RE） Dy can improve the cyclic oxidation of NiA1 alloys significantly. However, the mechanism of Dy addition is not clear. Even the existence pattern of Dy in NiA1 is unspecified. Therefore, in the present study, the impurity formation energies of Dy in stoichiometric NiA1, Ni-rich, and Al-rich NiA1 for the substitution cases were studied by first-principles density functional theory. The results show that Dy could hardly substitute for either Ni or A1 atoms in NiA1. However, calculations for dissolution energies show that Dy could be easily dissolved in AI vacancies in all three types of NiA1, which provides a new existence pattern of Dy in NiA1 beyond experimental detection.

关键词： Existence pattern Dy A1 vacancies First-principles

Thermal cycling performance of La_(2)Ce_(2)O_(7)/YSZ TBCs with Pt/Dy co-doped NiAl bond coat on single crystal superalloy

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Rare Metals 2021年第9期40卷 2568-2578页

作者： Zi-Min Zhou Hui Peng Lei Zheng Hong-Bo Guo Sheng-kai gong School of Materials Science and Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang UniversityBeijing 100191China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) Beihang UniversityBeijing 100191China

Thermal barrier coatings(TBCs) consisting ofLa_(2)Ce_(2)O_(7)(LCO) and Y_(2)O_(3)-stabilized-ZrO_(2)(YSZ) doubleceramic layer and Dy/Pt co-doped NiAl bond coat were produced by electron beam physical vapor deposition(EBPVD). Thermal cyclic performance of the TBCs was evaluated by flame shock testing at 1300 ℃. For comparison, the TBCs with a undoped NiAl bond coat were also studied. The microstructural evolution and failure mechanisms of the above TBCs during thermal cycling were investigated. Spallation failure of the TBCs with the undoped bond coat occurs after around 500 cycles by cracking at the interface between YSZ ceramic layer and thermally grown oxides(TGO) layer. The TBCs with Pt/Dy modified bond coat reveal improved interface bonding even after 1200 thermal cycles, whereas some delamination cracks are presented in the LCO layer. On the other hand,the Pt/Dy modified bond coat effectively suppresses the formation of the needle-like topologically closed packed phases(TCP) in the single crystal superalloy.

关键词： Thermal barrier coatings NiAl bond coat Pt/Dy co-doping Electron beam physical vapor deposition Thermal cycling Interdiffusion

Experimental Research on A New Type of Floating Breakwater for Wave-Absorbing and Energy-Capturing

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China Ocean Engineering 2020年第6期34卷 817-827页

作者： HUANG Fang-ping gong kai LIU Zuo-shi CHEN Jun-hua HUANG Yan-chen School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China School of Mechanical and Electrical Engineering Jiangxi University of Science and TechnologyGanzhouChina

To avoid the damage caused by big wind and wave in cage culture, and to solve the problem of energy supply faced by automatic breeding equipment, a new type of floating breakwater, named as Savonius double buoy breakwater(SDBB), is proposed in the paper. The floating breakwater is composed of HDPE cylindrical double buoys and horizontal axis Savonius rotors, and has the functions of wave-absorbing and energy-capturing. Based on the linear wave theory and energy conservation law, the Fourier Transform was applied to separate the two-dimensional wave frequency domain, and the energy captured by the rotors and absorbed by the floating breakwater were *** were conducted in a two-dimensional wave-making flume, and the transmitted waves at different wave heights and periods, the tension of mooring lines, and the rotational torque exerted on the Savonius rotor were measured. A series of performance comparison tests were also performed on the new floating breakwater and the traditional double-floating breakwater. Results show that the new floating breakwater is better than the traditional one in terms of reducing wave transmittance, and the combination of the floating breakwater with Savonius rotors can provide for marine aquaculture equipments with green power supply to a certain degree of self-sufficiency.

关键词： floating breakwater Savonius rotor transmission coefficient wave energy capturing mooring force