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Experimental Investigation and X-Ray Computed Microtomography Simulation on Thermal Physical Properties of Foundation Materials after Molten Salt Leakage in the Storage Tank

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Journal of Thermal Science 2024年第2期33卷 591-601页

作者： WANG Zhaowen zhou hao LUO Jiawei LI Yawei FANG hao LIU Tianxiao State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

This paper studied the thermal physical properties of foundation materials in the molten salt tank of thermal energy storage system after molten salt leakage by Transient plane source experiment and X-ray computed microtomography simulation *** microstructure,thermal properties and pressure resistance with different particle diameters were *** measured heat conductivities from Transient plane source experiment for three cases are 0.49 W/(m·K),0.48 W/(m·K),and 0.51 W/(m·K),and the porosity is 30.1%,30.7%,and 31.2% *** heat conductivity simulating results of three cases are 0.471 W/(m·K),0.482W/(m·K),and 0.513 W/(m·K).The ratio of difference between the results of simulation and Transient plane source measurement is as low as 1.2%,verifying the reliability of experimental and simulation results to a certain *** with the heat conductivity of 0.097-0.129 W/(m·K) and porosity of 71.6%-78.9% without leaking salt,the porosity is reduced by more than 50% while the heat conductivity increased by 4 to 5 times after molten salt *** significant increase in heat conductivity has a great impact on security operation,structure design,and modeling of the tank foundation for solar power plants.

关键词： heat conductivity X-ray computed microtomography foundation materials three-phase threshold algorithm molten salt leakage

Characterization of electrode fouling during electrochemical oxidation of phenolic pollutant

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 99-108页

作者： Xuefeng Liu Shijie You Fang Ma hao zhou State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin150090China Conservation Center Shanghai MuseumShanghai200231China

Electrode fouling is a problem that commonly occurs during electro-oxidation water *** study focused on identifying the fouling behavior of Pt electrode associated with the formation of polymeric layer during electro-oxidation of *** in situ electrochemical measurements and non-destructive observation of the electrode morphology were *** results demonstrated that the electrode fouling was highly dependent on thermodynamic process of electrode that was controlled by anode *** anode potential lower than 1.0 V vs SHE,the direct electro-oxidation caused the electrode fouling by the formation of polymeric *** fouling layer decreased the electrochemically active surface area from 8.38 cm^(2)to 1.57 cm^(2),indicated by the formation of polymeric film with thickness of 2.3µm,increase in mass growing at a rate of 3.26µg/cm^(2)/*** degree to which the anode was fouled was independent of anion in the *** comparison,at anode potential higher than 2.7 V vs SHE,the anions(e.g.,chloride)could exert a major influence to the behavior of electrode *** presence of chloride was shown to mitigate the fouling of electrode significantly through preventing the formation of polymeric film by active chlorine(e.g.,Cl•and Cl_(2))produced from anodic oxidation of *** chloride is the most abundant anionic species existing in both natural and engineered water system,this study not only offers a deep insight into the mechanism of electrode fouling,but also suggests strategies for anti-fouling in the presence of chloride in electro-oxidation process.

关键词： Electro-oxidation Electrode fouling Polymeric film Chloride ions

Preparation and properties of bifunctional Gd_(2)O_(3)/GQD composite nanoparticles

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Journal of Rare Earths 2022年第7期40卷 1118-1125页

作者： Chengjie Xu Meigui Ou hao zhou Chunlin Yang College of Materials and Metallurgy University of GuizhouGuiyang 550025China National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology Guiyang 550025China College of Chemistry and Materials Engineering Guiyang UniversityGuiyang 550003China

Nanocomposites of graphene quantum dots(GQDs)modified gadolinium oxide(Gd_(2)O_(3))particles were successfully *** addition,the effects of the amount of GQDs and the particle size of Gd_(2)O_(3)on the properties of nanocomposites were *** structures and properties of nanoparticles were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,Fourier transform infrared spectroscopy,field emission scanning electron microscopy,transmission electron microscopy,photoluminescence spectrometry,and magnetic resonance *** results show that the synthesized particles Gd_(2)O_(3)/GQD are spherical with a diameter of approximately 40 nm and have excellent fluorescence and magnetic property,and its relaxation rate(r_(1)=25.18(mmol/L)^(-1)/s)is higher than that of the typical commercial contrast agents Gd-DTPA(r_(1)=4.5(mmol/L)^(-1)/s),The fluorescence property of Gd_(2)O_(3)/GQD is optimized by varying the V_(GQDs):V_(Gd2O3)ratio,and 1:1 ratio of V_(GQDs):V_(Gd2O3)results in the best fluorescence *** large particles of Gd_(2)O_(3)improve the relaxation property of ***,the nanocomposites Gd_(2)O_(3)/GQD with magnetic and fluorescence characteristics can be used in biological imaging,drug targeting,and in-vivo diagnostic analysis.

关键词： Gd_(2)O_(3)/GQD Magnetic Fluorescence Magnetic resonance imaging(MRI) Rare earths

Nonlinear Dynamic Characteristics of Turbulent Non-Premixed Acoustically Perturbed Swirling Flames

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Journal of Thermal Science 2022年第3期31卷 882-894页

作者： zhou hao TAO Chengfei MENG Sheng CEN Kefa State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027China

The main objective of this article was to experimentally investigate the dynamic response of diffusion flame under acoustic excitation in a laboratory-scale *** parametric variations of the burner,the burner inlet length and variation of the airflow rate,were *** results were analyzed through nonlinear time series analysis and several resonance characteristics were *** indicate that the flame-acoustic resonance only appears under certain frequencies together with the fuel tube *** characteristics of the combustion chamber and air inlet in the non-premixed burner indicate quasi-periodic or limit cycle oscillations,***-acoustic resonance would trigger the frequency and amplitude mode-transition in ***,the intermittency of flame heat release was observed under variation of inlet length and airflow rate in the burner;the 445 mm case shows more frequency peaks and fluctuations than the 245 mm *** typical flame forms were examined during the flame-acoustic resonance conditions,evolves from wrinkled flames to diverged flames,then evolves to reattached flames and finally to blow-off *** study proposed the practical application of nonlinear time-series analysis method as a detection tool for flame-acoustic resonance in laboratory non-premixed burners,which could contribute to the detection and prevention of potential thermoacoustic instabilities or resonance structure failures of industrial ***,this study demonstrates an alternative to conventional linear tool for the characterization of nonlinear acoustic resonance in industrial boilers.

关键词： flame-acoustic resonance non-linear time series analysis non-premixed burners intermittency dynamic characteristics

Influence of ammonia and Brown gas injection on the iron ore sintering characteristics under biochar substitution

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Particuology 2024年第11期94卷 16-28页

作者： Laiquan Lv Jiankang Wang Hanxiao Meng hao zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

The influence of ammonia and Brown gas injection on the iron ore sintering characteristics was explored through sintering pot experiments based on biochar substitution to increase biochar substitution proportion and reduce fossil energy *** dividing the high-temperature stage of the sintering bed,the heating rate and cooling rate were calculated,and the reasons for poor sintering quality under a high biochar substitution ratio were *** results showed that under the 40%biochar substitution ratio,the cooling rate of the sintering bed significantly increased,the high-temperature duration time was short,and the sintering quality deteriorated *** injection of 0.5–1%vol ammonia or 1–2%vol Brown gas can reduce the cooling rate,prolong the high-temperature duration,and optimize the sintering *** on 1%vol ammonia or 2%vol Brown gas injection,reducing the proportion of biochar with equal calorific value further increases the sintering comprehensive index,which means that using 1%vol ammonia or 2%vol Brown gas injection to assist sintering can reduce the proportion of coke usage to 60%,while the proportion of biochar substitution is 33.76%and 32.47%,*** research results provide an effective solution for low-carbon sintering.

关键词： NH_(3)injection Brown gas injection Biochar substitution Iron ore sintering Coke consumption reduction

A 2-Stage Strategy for Non-Stationary Signal Prediction and Recovery Using Iterative Filtering and Neural Network

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Journal of Computer Science & Technology 2019年第2期34卷 318-338页

作者： Feng zhou hao-Min zhou Zhi-Hua Yang Li-Hua Yang School of Information Science Guangdong University of Finance and Economics Guangzhou 510320 China School of Mathematics Georgia Institute of Technology Atlanta GA 30332 U.S.A. Guangdong Province Key Laboratory of Computational Science Guangzhou 510275 China School of Mathematics Sun Yat-sen University Guangzhou 510275 China

Predicting the future information and recovering the missing data for time series are two vital tasks faced in various application *** are often subjected to big challenges,especially when the signal is nonlinear and nonstationary which is common in *** this paper,we propose a hybrid 2-stage approach,named IF2FNN,to predict(including short-term and long-term predictions)and recover the general types of time *** the first stage,we decompose the original non-stationary series into several“quasi stationary”intrinsic mode functions(IMFs)by the iterative filtering(IF)*** the second stage,all of the IMFs are fed as the inputs to the factorization machine based neural network model to perform the prediction and *** test the strategy on five datasets including an artificial constructed signal(ACS),and four real-world signals:the length of day(LOD),the northern hemisphere land-ocean temperature index(NHLTI),the troposphere monthly mean temperature(TMMT),and the national association of securities dealers automated quotations index(NASDAQ).The results are compared with those obtained from the other prevailing *** experiments indicate that under the same conditions,the proposed method outperforms the others for prediction and recovery according to various metrics such as mean absolute error(MAE),root mean square error(RMSE),and mean absolute percentage error(MAPE).

关键词： iterative filtering factorization machine neural network time series data recovery

Collapse Simulation and Response Assessment of a Large Cooling Tower Subjected to Strong Earthquake Ground Motions

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Computer Modeling in Engineering & Sciences 2020年第5期123卷 691-715页

作者： Tiancan Huang hao zhou Hamid Beiraghi Earthquake Engineering Research&Test Center Guangzhou UniversityGuangzhou510405China Department of Civil Engineering South China University of TechnologyGuangzhou510641China Department of Civil Engineering Mahdishahr BranchIslamic Azad UniversityMahdi Shahr***Iran

Large cooling towers in thermal power plants and nuclear power plants are likely to suffer from strong earthquakes during service *** resulting destructions of the cooling towers would endanger the power plants and threaten the security of the related *** is important to use effective means to evaluate the safety status of the cooling towers and guide further precautions as well as retrofitting *** paper is therefore focused on an elaborate numerical investigation to the earthquake-induced collapses of a large cooling tower structure.A complete numerical work for simulation of material failure,component fracture,structural buckling and system collapse is presented by integrating the stochastic damage constitutive model of concrete,refined structural element models,and some other key *** results indicate that the damage behavior and collapse mode of the cooling tower are affected notably by the randomness specification of ground *** collapse mechanisms of the cooling tower are studied from the energy absorption and dissipation points of *** effective energy-based criterion is introduced to identify the collapse of the cooling tower under ground motion *** distinct collapse modes are observed,the collapse criterion can predict well the damage and failure of the cooling *** proposed methodology is vital to better understanding the disastrous mechanisms and potential failure paths in optimal design of the cooling towers to ensure safety.

关键词： Cooling tower concrete damage mechanics collapse criterion responses

Wave height measurement in the Taiwan Strait with a portable high frequency surface wave radar

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Acta Oceanologica Sinica 2015年第1期34卷 73-78页

作者： zhou hao ROARTY Hugh WEN Biyang School of Electronic Information Wuhan University Suzhou Institute of Wuhan University Institute of Marine and Coastal Sciences Rutgers UniversityNew Jersey 08901USA

As an important equipment for sea state remote sensing, high frequency surface wave radar （HFSWR） has received more and more attention. The conventional method for wave height inversion is based on the ratio of the integration of the second-order spectral continuum to that of the first-order region, where the strong external noise and the incorrect delineation of the first- and second-order Doppler spectral regions due to spectral aliasing are two major sources of errors in the wave height. To account for these factors, two more indices are introduced to the wave height estimation, i.e., the ratio of the maximum power of the second-or- der continuum to that of the Bragg spectral region （RSCB） and the ratio of the power of the second harmonic peak to that of the Bragg peak （RSHB）. Both indices also have a strong correlation with the underlying wave height. On the basis of all these indices an empirical model is proposed to estimate the wave height. This method has been used in a three-months long experiment of the ocean state measuring and analyzing ra- dar, type S （OSMAR-S）, which is a portable HFSWR with compact cross-loop/monopole receive antennas developed by Wuhan University since 2006. During the experiment in the Taiwan Strait, the significant wave height varied from 0 to 5 m. The significant wave heights estimated by the OSMAR-S correlate well with the data provided by the Oceanweather Inc. for comparison, with a correlation coefficient of 0.74 and a root mean square error （RMSE） of 0.77 m. The proposed method has made an effective improvement to the wave height estimation and thus a further step toward operational use of the OSMAR-S in the wave height extraction.

关键词： wave height high frequency surface wave radar field experiment comparison Taiwan Strait

A high-strength self-healing nano-silica hydrogel with anisotropic differential conductivity

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Nano Research 2021年第8期14卷 2589-2595页

作者： Xingyu Huang Xiaofan zhou hao zhou Yidan Zhong Hui Luo Fan Zhang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Jiangsu Provincial Key Lab of Pulp and Paper Science and TechnologyCollege of Light Industry and FoodNanjing Forestry UniversityNanjing 210037China Department of Creative Design Zhicheng CollegeFuzhou UniversityFuzhou 350000China

Soft nano electronic materials based on conductive hydrogels have attracted considerable attention due to their exceptional *** deposition and poor interface compatibility often diminish the mechanical strength and electron transport capabilities of the conductive *** damage can severely impact the performance of the conductive hydrogel and can even damage electronic devices based on the conductive *** the current study,a transparent nano-silica hydrogel is prepared by employing an extremely easy-to-operate *** approach can preclude the deposition of particles via strong mechanical *** addition,controlling the concentration of the reaction interface makes the hydrogel grow along the mechanical force in the direction with a special directional hole structure *** hydrogel is transparent,showing excellent self-healing properties—it can self-heal within 15 ***,the hydrogel after self-healing maintains its ***,it has excellent mechanical properties and can be stretched in *** to 1,200%of the original length,the tensile strength of the gel spline can reach 7 *** viscosity of the hydrogel can reach 1.67×10^(8)(MPs).In addition,a large amount of Na+in this hydrogel endow it a conductivity of 389 ps/*** conductivity of this hydrogel is adjustable result from the special pore ***,the difference between the horizontal and vertical conductivity of the same sample can reach 3-4 times,thus this hydrogel can be used in the field of nano conductive materials.

关键词： self-healing nanosilica hydrogels anisotropic conductivity