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Nonlinear analysis of combustion oscillations in a cavity-based supersonic combustor

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Science China(Technological Sciences) 2013年第5期56卷 1093-1101页

作者： WANG HongBo WANG ZhenGuo SUN MingBo wu haiyan Science and Technology on Scramjet Laboratory National University of Defense Technology

Combustion oscillations in a supersonic combustor with hydrogen injection upstream of a cavity flameholder are investigated using nonlinear analysis based on experimental *** series of both flamefront and wall pressure are acquired,and the state space reconstruction approach is adopted to characterize the nonlinear behavior of the combustion *** overall equivalence ratios,0.038,0.076 and 0.11,are *** existence of a chaotic source in the present combustion system is *** correlation dimension and the largest Lyapunov exponent tend to become larger with the increasing equivalence ratio,indicating a more complicated and unstable combustion *** particular,it is found that the correlation dimension for the highest equivalence ratio is much greater than those of the two lower equivalence *** possible reasons responsible for the observed nonlinear behaviors are *** is the shock-related instabilities and the other is the transition of combustion stabilization mode between the cavity and jet-wake stabilized mode.

关键词： cavity supersonic combustion oscillation nonlinear

Progress in the Clinical Features and Pathogenesis of Abnormal Liver Enzymes in Coronavirus Disease 2019

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Journal of Clinical and Translational Hepatology 2021年第2期9卷 239-246页

作者： haiyan wu Shuzhong Liu Hesheng Luo Mingkai Chen Department of Gastroenterology Renmin Hospital of Wuhan UniversityWuhanHubeiChina

With the rapid development of research on coronavirus disease 2019(COVID-19),more and more attention has been drawn to its damage to extrapulmonary *** are increasing lines of evidence showing that liver injury is closely related to the severity of COVID-19,which may have an adverse impact on the progression and prognosis of the *** is more,severe acute respiratory syndrome coronavirus-2 infection,cytokine storm,ischemia/hypoxia reperfusion injury,aggravation of the primary liver disease and drug-induced liver injury may all contribute to the hepatic damage in COVID-19 patients;although,the drug-induced liver injury,especially idiosyncratic drug-induced liver injury,requires further causality confirmation by the updated Roussel Uclaf Causality Assessment Method published in *** to now,there is no specific regimen for COVID-19,and COVID-19-related liver injury is mainly controlled by symptomatic and supportive ***,we review the clinical features of abnormal liver enzymes in COVID-19 and pathogenesis of COVID-19-related liver injury based on the current evidence,which may provide help for clinicians and researchers in exploring the pathogenesis and developing treatment strategies.

关键词： Coronavirus disease 2019 Abnormal liver enzymes Liver injury Idiosyncratic drug-induced liver injury Roussel Uclaf Causality Assessment Method Clinical characteristics

FOULING DETECTION IN FOOD VESSELS USING INTERDIGITAL LAMB WAVE TRANSDUCER

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维普期刊数据库

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Chinese Journal of Mechanical Engineering 2007年第1期20卷 111-114页

作者： JIAO Jingpin GE haiyan wu Bin HE Cunfu College of Mechanical Engineenng and Applied Electronic Technology Beijing University of Technology Beijing 100022 China

Lamb waves are used to detect fouling in food vessels. The propagation of the Lamb waves in plates exhibits many modes and dispersion characteristics, which have great influence on fouling detection. The relative distribution of the in-plane and out-of-plane displacement of the mode across the thickness of the plate will determine the sensitivity of the mode to a particular loading condition. By considering the dispersion and multi-mode characteristics of guided waves, an interdigital polyvi- nylidene fluoride （PVDF） transducer is designed to realize the mode selection of gnided waves, and a single a0 mode is used for guided wave detection. Fouling detection experiments are conducted in the laboratory using epoxy adhesive on a thin plate. Using the interdigital PVDF transducer, three fouled areas are detected. Using one of the time-frequency analysis methods, the waveforms are further processed. This also demonstrates the validity of this method of fouling detection.

关键词： Lamb waves Interdigital transducer Fouling detection

Synthesis and Characterization of Polythiophenes Bearing Diphenyl Groups in the Conjugated Chain

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Journal of wuhan University of Technology(Materials Science) 2015年第3期30卷 568-573页

作者：周勇刘福德 wu haiyan QU Boyang DUAN Lijie Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry & Chemical Engineering Tianjin University of Technology

4,4＇-dibromo-2-nitro-biphenyl and 4,4＇-dibromo-2,3＇-dinitro-biphenyl have been synthesized via nitration reaction with 4,4＇-dibromobiphenyl as the raw material. Three novel thiophene derivatives, 4, 4＇-di（4-hexyl-thiophen-2-yl）biphenyl, 4,4＇-di（4-hexyl-thiophen-2-yl）-2- nitro-biphenyl and 4,4＇-di（4- hexyl-thiophen-2-yl）-2,3＇-dinitrobiphenyl were synthesized through Stille coupling reaction, followed by polymerization in the presence of FeC13, respectively. UV-vis absorption spectra, fluorescence spectra, photoluminescence spectra and electrochemical properties of the polymers were investigated. And the band-gap （Eg）, HOMO orbital energy （EHCMO）, and LUMO orbital energy （EUJMO） of the polymers were calculated. Among the polymers, polymer PBTN and PBTD show lower band-gap （2.67 and 2.63 eV）, lower HOMO energy level （-5.38 and -5.4 eV） and broader wavelength （432 and 438 nm） than that of polymer PBTB （2.69 eV, -5.36 eV and 424 nm） with incorporation of one nitro group or two nitro groups in the main chain, respectively.

关键词： polythiophene biphenyl nitro group stille coupling reaction

Semiparametric Regression and Model Refining

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Geo-Spatial Information Science 2002年第4期5卷 10-13页

作者： SUN haiyan wu Yun School of Geodesy and Geomatics Wuhan University Wuhan China

This paper presents a semiparametric adjustment method suitable for general *** that the regularizer matrix is positive definite,the calculation method is discussed and the corresponding formulae are ***,a simulated adjustment problem is constructed to explain the method given in this *** results from the semiparametric model and G_M model are *** results demonstrate that the model errors or the systematic errors of the observations can be detected correctly with the semiparametric estimate method.

关键词： model error systematric error semiparametric regression model refine regularizer matrix smoothing parameter

A hybrid LES (Large Eddy Simulation)/assumed sub-grid PDF (Probability Density Function) model for supersonic turbulent combustion

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Science China(Technological Sciences) 2011年第10期54卷 2694-2707页

作者： WANG HongBo QIN Ning SUN MingBo wu haiyan WANG ZhenGuo College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China Department of Mechanical Engineering University of Sheffield SheffieldS1 3JD UK

A hybrid LES (Large Eddy Simulation)/assumed sub-grid PDF (Probability Density Function) closure model has been devel-oped for supersonic turbulent combustion. Scalar transport equations for all species in a given chemical kinetic mechanism were solved, which are necessary in the supersonic combustion where the non-equilibrium chemistry is essentially involved. The clipped Gaussian PDF of temperature and multivariate ? PDF of composition were used to close the sub-grid chemical sources that appear in the conservation equations. The sub-grid variances of temperature and composition were constructed based on scale similarity approach. A semi-implicit approach based on the PDF model was proposed to tackle the resulting numerical stiffness associated with finite rate chemistry. The model was applied to simulate a supersonic, coaxial H2-air burner, where both the mean and rms (root mean square) results were compared with the experimental data. In general, good agree-ments were achieved, which indicated that the present sub-grid PDF method could work well in simulating supersonic turbu-lent combustion. Moreover, the calculation showed that the sub-grid fluctuations of temperature and major species in the combustion region were of the order of 10%-20% of their rms, while the sub-grid fluctuation of hydroxyl might be as high as 40%-50% of its rms.

关键词： LES(Large Eddy Simulation) assumed PDF(Probability Density Function) supersonic turbulent combustion

Synthesis and Characterization of Poly(N-Hexyl-2, 7-di(2-(4-hexylthiophene)carbazole)

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Journal of wuhan University of Technology(Materials Science) 2015年第5期30卷 1098-1102页

作者：周勇刘福德 wu haiyan DUAN Lijie QU Boyang Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry & Chemical Engineering Tianjin University of Technology

One conjugated polymer consisting of carbazole and 3-hexylthiophene moiety, poly(N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole)(PNDC), has been synthesized by ferric chloride oxidative polymerization. The monomer N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole was synthesized and characterized by IR, 1H-NMR, 13C-NMR and MS. UV-vis absorption spectrum, fluorescence spectrum, photoluminescence spectrum and electrochemical properties of the polymer were investigated. Polymer PNDC shows maximum peak appearing at 394 nm in UV-vis absorption spectrum, strongest fluorescence-emission at 482 nm in fluorescence spectrum and maximum emission peak at 492 nm in photoluminescence spectrum. The band-gap(Eg), HOMO energy(EHOMO), and LUMO energy(ELUMO) of the polymer were obtained as 2.58,-5.32, and-2.74 e V, respectively.

关键词： polycarbazole polythiophene ferric chloride

First observation of domoic acid and its isomers in shellfish samples from Shandong Province,China

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Journal of Oceanology and Limnology 2022年第6期40卷 2231-2241页

作者： Guanchao ZHENG haiyan wu Mengmeng GUO Jixing PENG Yuxiu ZHAI Zhijun TAN Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality Ministry of Agriculture and Rural Aff airsYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China

A total of 133 shellfish samples were collected in seven cities of Shandong Province,China,from May to October,*** domoic acid(DA)concentrations were determined by liquid chromatographytandem mass spectrometry(LC-MS/MS),and their distribution characteristics were *** concentration was detected high in over 1/3(36.1%)of the samples of four kinds of shellfish in all three seasons in range from 0 to 102μg/*** highest DA concentrations were 102,101,36.7,and 10.2μg/kg in Crassostrea gigas,Chlamys farreri,Mactra veneriformis,and Mytilus edulis,***,Yantai(22.0μg/kg)and Weihai(16.9μg/kg)showed relatively high concentrations of DA,whereas Rizhao and Dongying presented only 0.85-and 1.76-μg/kg DA,*** concentrations in the shellfish samples were strongly related to seasonal changes,being significantly higher in autumn and summer than that in *** DA risk exposure assessments indicate that dietary seafood consumption did not pose a health threat to general human *** addition,three isomers(isoA,isoD,isoE)and 5′-epimer DA were detected in 3.00%-15.80%of the shellfish *** study is the first to observe DA and its isomers in shellfish samples of Shandong *** results demonstrate that DA contamination is very common and should be continuously monitored.

关键词： domoic acid shellfi sh liquid chromatography-tandem mass spectrometry(LC-MS/MS) Shandong Province

Thermal processing induced release and degradation of paralytic shellfish toxin from mussels Mytilus edulis

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Journal of Oceanology and Limnology 2022年第6期40卷 2267-2276页

作者： Chenfan DONG haiyan wu Jixing PENG Mengmeng GUO Yuxiu ZHAI Zhijun TAN College of Food Science and Technology Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality Ministry of AgricultureYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China

Understanding the risk factors associated with shellfish consumption is a relevant public health concern because of the potential adverse ef fects of paralytic shellfish toxins(PSTs).This work aims to study the effects of the five most common heating treatments(steaming,boiling,frying,water-bath heating,and microwaving),for different processing times and temperature/power settings,on the content of PSTs in mussels(Mytilus edulis)collected in Qinhuangdao,*** toxin concentration,removal percentages,and toxin distribution in the cooking liquor and meat were *** five processing modes effectively accelerated toxin release into the cooking *** average percentage removal was 73.53%±16.50%from *** led to the most significant toxin degradation among the methods *** findings should facilitate risk assessment of PSTs in mussels.

关键词： processing mode mussels removal percentage toxin distribution