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Experiments of effects of inlet-air distortion on aerodynamic performance in transonic compressor

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航空动力学报 2013年第5期28卷 1047-1056页

作者： LI Mao-yi YUAN wei LU Ya-jun SONG Xi-zhen LU Li-peng National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics School of Energy and Power EngineeringBeijing University of Aeronautics and Astronautics

The inlet-air distortion which was caused by high angle-of-attack flight was simulated by *** were conducted on a transonic axial-flow compressor's rotor at 98% rotating *** flow-field characteristics and mechanism of performance degradation were analyzed in *** compressor inlet was divided into four sectors at circumference under inlet-air *** were undistorted sector,transition sector A where the rotor was rotating into the distortion sector,distorted sector and transition sector B where the rotor was rotating out of the distortion *** experimental results show that compared with undistorted sector,there is a subsonic flow in transition sector A,so the pressure ratio is decreased by a large margin in this ***,the shock wave is enhanced in distortion sector and transition sector B,and thus the pressure ratio increases in these *** of the different works at circumference,the phase angle of total pressure changes 90° when the inlet total pressure distortion passes through compressor *** addition,the frequency and amplitude of disturbances in front of the rotor strengthenes under inlet distortion,so the unstable flow would take place in *** addition,the position of stall inception is in one of the transition sectors.

关键词： plugboard simulator inlet-air distortion transonic axial-flow compressor shock wave disturbance

Mid-infrared optical modulator enabled by photothermal effect

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Light(Science & Applications) 2023年第1期12卷 5-7页

作者： zhen Wang wei Ren Department of Mechanical and Automation Engineering The Chinese University of Hong KongNew TerritoriesHong Kong SARChina

Photothermal effect in a gas-filled hollow-core fiber may result in agile mid-infrared optical modulators for broadband phase modulation and high extinction ratio intensity modulation.

关键词： modulator optical fiber

Fatty liver diseases, mechanisms, and potential therapeutic plant medicines

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Chinese Journal of Natural Medicines 2020年第3期18卷 161-168页

作者： ZHU Jia-zhen yi Hong-wei HUANG wei PANG Tao ZHOU Hui-Ping WU Xu-Dong State Key Laboratory of Pharmaceutical Biotechnology School of Life SciencesNanjing UniversityNanjing 210023China Department of Pharmacology School of MedicineSoutheast UniversityNanjing 210009China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210009China Department of Microbiology and Immunology and Mc Guire Veterans Affairs Medical Center Virginia Commonwealth UniversityRichmond 23218USA

The liver is an important metabolic organ and controls lipid, glucose and energy metabolism. Dysruption of hepatic lipid metabolism is often associated with fatty liver diseases, including nonalcoholic fatty liver disease(NAFLD), alcoholic fatty liver diseases(AFLD) and hyperlipidemia. Recent studies have uncovered the contribution of hormones, transcription factors, and inflammatory cytokines to the pathogenesis of dyslipidemia and fatty liver diseases. Moreover, a significant amount of effort has been put to examine the mechanisms underlying the potential therapeutic effects of many natural plant products on fatty liver diseases and metabolic diseases. We review the current understanding of insulin, thyroid hormone and inflammatory cytokines in regulating hepatic lipid metabolism, focusing on several essential transcription regulators, such as Sirtuins(SIRTs), Forkhead box O(FoxO), Sterol-regulatory element-binding proteins(SREBPs). We also discuss a few representative natural products with promising thereapeutic effects on fatty liver disease and dyslipidemia.

关键词： Fatty liver disease Lipid metabolism Hormones Transcription factors Inflammatory cytokines Natural products

Effect of Cu Addition in Pipeline Steels on Microstructure,Mechanical Properties and Microbiologically Influenced Corrosion

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Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 601-613页

作者： Xian-Bo Shi wei Yan Mao-Cheng Yan wei Wang zhen-Guo Yang yi-yin Shan Ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

In the present study, Cu-modified pipeline steels were fabricated to mitigate MIC by the antimicrobial ability of Cu element. The microstructure, mechanical properties and the antimircobial performance of the Cu-modified steel were systematically investigated. The Cu-modified steels showed good antimicrobial performance with remarkable strength enhancement by nanoscale Cu-rich precipitates and good impact toughness without changing the original base microstructures after the optimal aging treatment of 500 °C/1 h.

关键词： Pipeline steel Cu addition Mechanical properties Microstructure Antimicrobial performance

Renewable molybdate complexes encapsulated in anion exchange resin for selective and durable removal of phosphate

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Chinese Chemical Letters 2021年第11期32卷 3382-3386页

作者： wei Zhu Xiaohua Huang yi Zhang Zhonglong yin zhen Yang weiben Yang School of Chemistry and Materials Science Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution ControlNanjing Normal UniversityNanjing 210046China

The existence of many anions in wastewater reduces the removal efficiency of phosphate by adsorbents under realistic *** this challenge,the study reports on an insistent and stable composite adsorbent of molybdate complexes Fe-(MoO_(x))embedded in a macroporous anion exchange resin(D-201).[Fe(MoO_(x))]-D-201 shows 93.7%adsorption capacity(28.3 mg/g)for phosphate even when the molar concentration of coexisting ions is 5 times higher than *** capacity of adsorbent is maintained more than 84.2%after five regeneration cycles to remove phosphate in the wastewater containing coexisting *** ability of highly selective removal of phosphate is maintained during the regeneration cycles explained by the change of the binding of molybdate clusters with phosphate,which is due to the different structures of molybdate clusters depending on various *** general,this work puts forward a new idea for the development of phosphorus removal adsorbents for the treatment of wastewater containing coexisting ions.

关键词： Molybdate composite adsorbent Resin Phosphate removal Selective and durable adsorption Structural transformation of complexes

A mechanically robust egg white hydrogel scaffold with excellent biocompatibility by three-step green processing

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Science China(Technological Sciences) 2022年第7期65卷 1599-1612页

作者： wei zhen-zhen DONG Xuan ZHANG Yu-Qing School of Biology and Basic Medical Sciences Medical CollegeSoochow UniversitySuzhou 215123China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Egg white(EW) is one of the most common and high-quality nutritional proteins. A novel three-step green processing technology is constructed to process homogeneous EW into a mechanically robust EW hydrogel scaffold(EWHS) with excellent biocompatibility. The homogeneous EW is first treated with stream to form a hydrogel, then slowly dehydrated to form a fragile and almost transparent EW glass, and finally annealed into an EWHS. The EWHS is water-insoluble, wet soft and translucent and has a porous network structure, and its pore size distribution is between 0.1–1.0 μm. The tensile strength in wet state is as high as 5.0 MPa, the elongation at break is about 93%, and the swelling rate is about 85%. The order of the enzymatically residual rate of these EWHSs is pepsin > neutral protease > papain> trypsin > alkaline protease. Mouse L929 cells can adhere,proliferate, and grow well on the EWHSs. After EWHS was implanted in rats for three weeks, the levels of IL-6, TNF-α, and NF-κB inflammatory factors did not change significantly in comparison with the pseudo-operated and normal groups. This novel EW hydrogel biomaterial has potential applications in medical 3 D tissue engineering materials, such as tendons, soft tissues, and in vivo implants.

关键词： egg white hydrogel scaffolds dehydration heat treatment mechanical properties swelling rate

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Global Exact Boundary Controllability for Cubic Semi-linear Wave Equations and Klein-Gordon Equations

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Chinese Annals of Mathematics,Series B 2010年第1期31卷 35-58页

作者： yi ZHOU wei XU zhen LEI Key Laboratory of Mathematics for Nonlinear Sciences School of Mathematical Sciences Fudan University Shanghai 200433 China School of Mathematical Sciences Fudan University Shanghai 200433 China

The authors prove the global exact boundary controllability for the cubic semilinear wave equation in three space dimensions,subject to Dirichlet,Neumann,or any other kind of boundary controls which result in the well-posedness of the corresponding initial-boundary value *** exponential decay of energy is first established for the cubic semi-linear wave equation with some boundary condition by the multiplier method,which reduces the global exact boundary controllability problem to a local *** proof is carried out in line with [2,15].Then a constructive method that has been developed in [13] is used to study the local *** when the region is star-complemented,it is obtained that the control function only need to be applied on a relatively open subset of the *** the cubic Klein-Gordon equation,similar results of the global exact boundary controllability are proved by such an idea.

关键词： Global exact boundary controllability Cubic semi-linear wave equations The exponential decay Star-shaped Star-complemented Cubic Klein- Gordon equations

Application of deep learning method to Reynolds stress models of channel flow based on reduced-order modeling of DNS data

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Journal of Hydrodynamics 2019年第1期31卷 58-65页

作者： zhen Zhang Xu-dong Song Shu-ran Ye yi-wei Wang Chen-guang Huang yi-ran An Yao-song Chen Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China College of Engineering Science University of Chinese Academy of SciencesBeijing 100049China College of Engineering Peking UniversityBeijing 100871China

Recently,the methodology of deep learning is used to improve the calculation accuracy of the Reynolds-averaged Navier-Stokes (RANS) *** this paper,a neural network is designed to predict the Reynolds stress of a channel flow of different Reynolds *** rationality and the high efficiency of the neural network is validated by comparing with the results of the direct numerical simulation (DNS),the large eddy simulation (LES),and the deep neural network (DNN) of other *** further enhance the prediction accuracy,three methods are developed by using several algorithms and simplified models in the neural *** the method *** regularization is introduced and it is found that the oscillation and the overfitting of the results are eflectively *** the method 2,y^+ is embedded in the input variable while the combination of the invariants is simplified in the method *** the predicted results,it can be seen that by using the first two methods,the errors are ***,the method 3 shows considerable advantages in the DNS trend and the smoothness of a ***,it is concluded that the DNNs can predict effectively the anisotropic Reynolds stress and is a promising technique of the computational fluid dynamics.

关键词： Deep neural network channel flow turbulence model Reynolds stress

Corrosion behavior of additive-manufactured NiFeCrMo alloys in various corrosion media

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Journal of Iron and Steel Research International 2023年第8期30卷 1574-1585页

作者： Dong-peng Wang Shuai Wang zhen Chen Xing-cheng Xie zhen-zhen Dong Hong-zhou Dong yi-cheng Wu zhen-guang Liu wei-li Li Yu-xin Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina GRIMAT Engineering Institute Co. Ltd.Beijing 101407China GRINM(Guangdong)Institute for New Advanced Materials and Technology Dongguan 528041GuangdongChina School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

To understand the corrosion performance of additive-manufactured Ni-based in various corrosion media during the actual engineering application environment,the corrosion properties of NiFeCrMo alloys were investigated in 3.5 wt.%NaCl solution,1 mol/L H2SO_(4) solution,and 1 mol/L KOH solution,using potentiodynamic polarization and electrochemical impedance *** electrochemical measurement results revealed that the additive-manufactured NiFeCrMo alloys have higher corrosion resistance in all three solutions,compared with the as-cast *** results of the scanning electron microscope confirmed that the degree of additive-manufactured NiFeCrMo alloys after potentiostatic polarization in all three solutions is less serious.X-ray photoelectron spectroscopy analysis revealed that the enhancement of the corrosion resistance for the additive-manufactured NiFeCrMo alloys is attributed to the modification of the composition of the passive *** manufactured processing promotes the enrichment of the element of Cr or Mo in the passive film and it suppresses the formation of the oxidation of the element of Fe,leading to higher stability of the passive *** reason for the higher corrosion resistance of the additive-manufactured NiFeCrMo alloys was related to the enrichment of the element of Cr,as well as the lower content of the elements of Ni and Fe near the grain boundaries,which are beneficial to forming a more compact passive *** combined results are essential for the applications of high-strength Ni-based as structural materials in a corrosion environment.

关键词： Ni-based alloy Additive manufacturing Corrosion Passive film Corrosion media