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Recent advances in preparation of metallic superhydrophobic surface by chemical etching and its applications

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Chinese Journal of Chemical Engineering 2023年第9期61卷 221-236页

作者： Shitong zhu Wenyi deng Yaxin Su College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

In the past few decades,inspired by the superhydrophobic surfaces(SHPS)of animals and plants such as lotus leaves,rose petals,legs of water striders,and wings of butterflies,preparing metal materials with metallic SHPS(MSHPS)have attracted great research interest,due to the great prospect in practical *** obtain SHPS on conventional metal materials,it is necessary to construct rough surface,followed by modification with low surface energy *** this paper,the action mechanism and the current research status of MSHPS were reviewed through the following ***,the model of wetting theory was presented,and then the progress in MSHPS preparation through chemical etching method was ***,the applications of MSHPS in self-cleaning,anti-icing,corrosion resistance,drag reduction,oil-water separation,and other aspects were ***,the challenges encountered in the present application of MSHPS were summarized,and the future research interests were discussed.

关键词： Metal Superhydrophobic surface Chemical etching Low adhesion Self-cleaning

Random vortex induced vibration response of suspended flexible cable to fluctuating wind

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Applied Mathematics and Mechanics(English Edition) 2023年第12期44卷 2207-2226页

作者： Genjin MU Weiqiu zhu Maolin deng Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou 310027China

A popular dynamical model for the vortex induced vibration(VIV)of a suspended flexible cable consists of two coupled *** first equation is a partial differential equation governing the cable *** second equation is a wake oscillator that models the lift coefficient acting on the *** incoming wind acting on the cable is usually assumed as the uniform wind with a constant velocity,which makes the VIV model be a deterministic *** the real world,however,the wind velocity is randomly fluctuant and makes the VIV of a suspended flexible cable be treated as a random *** the present paper,the deterministic VIV model of a suspended flexible cable is modified to a random one by introducing the fluctuating *** the normal mode approach,the random VIV system is transformed into an infinite-dimensional modal vibration *** on whether a modal frequency is close to the aeolian frequency or not,the corresponding modal vibration is characterized as a resonant vibration or a non-resonant *** applying the stochastic averaging method of quasi Hamiltonian systems,the response of modal vibrations in the case of resonance or non-resonance can be analytically ***,the random VIV response of the whole cable can be approximately calculated by superimposing the response of the most influential modal *** numerical simulation results confirm the obtained analytical *** is found that the intensity of the resonant modal vibration is much higher than that of the non-resonant modal ***,the analytical results of the resonant modal vibration can be used as a rough estimation for the whole response of a cable.

关键词： vortex induced vibration(VIV) wake oscillator random response suspended flexible cable fluctuating wind

Pressure Analysis of the Initial Process of Diffusion Combustion Surge in a 350 kW Gas Boiler

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Journal of Thermal Science 2022年第2期31卷 582-589页

作者： GAO Han zhu Tong PAN deng School of Mechanical Engineering Tongji UniversityShanghai 201804China

In order to meet the increasingly stringent requirements for nitrogen oxides(NOx)emissions from gas boilers,flue gas recirculation(FGR)technology is commonly used to achieve ultra-low NOx ***,under some ultra-low NOx combustion conditions with FGR,a surge phenomenon occurs in the boiler,which causes a flameout and should be *** this study,the diffusion combustion surge of gas boiler with a rated power of 350 k W and equipped with FGR device was *** characteristic analysis results of the initial process of combustion surge showed that the high-frequency component of pressure is closely related to combustion stability and its change can provide reference for the occurrence of ***,the initial process of surge was analyzed by wavelet packet entropy *** indicated that the wavelet packet entropy of pressure signals could effectively reflect the stability of combustion in the furnace,and it could also be used to study the occurrence of surge.

关键词： diffusion combustion flue gas recirculation wavelet packet entropy surge gas boiler

Hybrid membrane computing and pigeon-inspired optimization algorithm for brushless direct current motor parameter design

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Science China(Technological Sciences) 2016年第9期59卷 1435-1441页

作者： deng YiMin zhu WeiRen DUAN HaiBin Bio-inspired Autonomous Flight Systems (BAFS) Research Group Science and Technology on Aircraft Control Laboratory Beihang University School of Automation Science and Electrical Engineering Beihang University

In this paper, a novel approach is proposed for solving the parameter design problem of brushless direct current(BLDC) motor, which is based on the membrane computing(MC) and pigeon-inspired optimization(PIO) algorithm. The motor parameter design problem is converted to an optimization problem with five design parameters and six constraints. The PIO algorithm is introduced into the framework of MC for improving the global convergence performance. The hybrid algorithm can improve the population diversity with better searching efficiency. Comparative simulations are conducted, and comparative results are given to show the feasibility and effectiveness of our proposed hybrid algorithm for high nonlinear optimization problems.

关键词： brushless direct current(BLDC) motor pigeon-inspired optimization(PIO) membrane computing(MC)

Double Andreev reflections at surface states of the topological insulators with hexagonal warping

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Frontiers of physics 2020年第2期15卷 79-86页

作者： Chang-Yong zhu Shi-Han Zheng Hou-jian Duan Ming-Xun deng Rui-Qiang Wang Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China School of Physics and Mechanical and Electrical Engineering Shaoguan UniversityShaoguan 512005China

We study the Andreev reflection(AR)at the interface of the topological insulator with hexagonal warping and superconductor *** to the hexagonal warping effect,the double ARs are found in a certain range of the incident angle,where for one incident electron beam,two beams of holes are reflected ***,both the beams of holes are reflected as retro-AR on the same side of the normal line of the interface but with different reflection angles,different from the previously reported double AR with one retro-AR and one *** double reflections owing to the warping effect show the optics-like property of the Dirac fermion and can stimulate the double reflections of light in anisotropic *** addition,we find that the double ARs are dependent on the hexagonal warping parameter nonmonotonically,and in an intermediate strength the double AR phenomenon is prominent,providing a possibility to explore the warping parameter of topological insulators.

关键词： Andreev reflection topological insulator warping effect

A desulphurization strategy for Sonogashira couplings by visible light/copper catalysis

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Organic Chemistry Frontiers 2022年第2期9卷 386-393页

作者： Xuan Li Min jiang Xiaolong zhu Xiuyan Song Qirong deng jian Lv Daoshan Yang Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao266042P.R.China Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084People’s Republic of China College of Materials Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou310036P.R.China

The development of new copper-based catalysts in photoredox transformations has become a rapidly growing area of research and has been actively explored in the past several ***,we have developed a new copper-based catalyst,[(binap)(tpy)Cu]Cl,and applied it in the visible-light promoted Sonogashira coupling *** mild protocol results in various substituted alkynes from simple sulfonium salts which can be easily prepared from commercially available and inexpensive thiols,alcohols,and alkyl *** study will broaden the still limited strategies of copper photocatalysts in organic transformations.

关键词： copper visible coupling

Some applications of stochastic averaging method for quasi Hamiltonian systems in physics

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Science China(Physics,Mechanics & Astronomy) 2009年第8期52卷 1213-1222页

作者： deng MaoLin zhu WeiQiu Department of Mechanics State Key Laboratory of Fluid Power Transmission and ControlZhejiang UniversityHangzhou 310027China

Many physical systems can be modeled as quasi-Hamiltonian systems and the stochastic averaging method for quasi-Hamiltonian systems can be applied to yield reasonable approximate response *** the present paper,the basic idea and procedure of the stochastic averaging method for quasi Hamiltonian systems are briefly *** applications of the stochastic averaging method in studying the dynamics of active Brownian particles,the reaction rate theory,the dynamics of breathing and denaturation of DNA,and the Fermi resonance and its effect on the mean transition time are reviewed.

关键词： stochastic averaging method quasi Hamiltonian system Brownian motion reaction rate theory DNA denaturation Fermi resonance

Hydrogen and steam distribution following a small-break LOCA in large dry containment

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Nuclear Science and Techniques 2007年第3期18卷 181-185页

作者： deng jian CAO Xuewu School of Nuclear Science and Engineering Shanghai Jiaotong University Shanghai 200240 China

The hydrogen deflagration is one of the major risk contributors to threaten the integrity of the containment in a nuclear power plant, and hydrogen control in the case of severe accidents is required by nuclear regulations. Based on the large dry containment model developed with the integral severe-accident analysis tool, a small-break loss-of-coolant-accident (LOCA) without HPI, LPI, AFW and containment sprays, leading to the core degradation and large hydrogen generation, is calculated. Hydrogen and steam distribution in containment compartments is investi- gated. The analysis results show that significant hydrogen deflagration risk exits in the reactor coolant pump (RCP) compartment and the cavity during the early period, if no actions are taken to mitigate the effects of hydrogen accu- mulation.

关键词：氢蒸发严重事故氢分布小破口事故

Synthesis and Biological Activity of Philanthotoxin Analogs

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Chinese Chemical Letters 2006年第7期17卷 895-898页

作者： Yong An ZHANG Ke Zhong LIU deng Yuan WANG Yu zhu WANG Liang jian QU Chang Jin zhu Research Institute of Forest Ecology Environment and Protection CAE Beijing 100091 The College of Agronomy Xinjiang Agricultural University Urumqi 830052 Department of Applied Chemistry Beijing Institute of Technology Beijing 100081

The synthesis of four analogs of philanthotoxin is described. The preliminary bioassay showed that these compounds all had good insecticidal activities, and the compound 6a had the best killing effect.

关键词： PhTX synthesis biological activity