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Inverse Coefficient Problems for Nonlinear Parabolic Differential Equations

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Acta Mathematica Sinica,English Series 2008年第10期24卷 1617-1624页

作者： yun hua ou Alemdar HASANOV Zhen Hai LIU Department of Mathematics Hu'nan University of Technology Zhuzhou Hu'nan 412007 P. R. China Applied Mathematical Sciences Research Center Kocaeli University Izmit-Kocaeli 41300 Turkey Department of Mathematics Central South University Changsha 410075 P. R. China

This paper is devoted to a class of inverse problems for a nonlinear parabolic differential equation. The unknown coefficient of the equation depends on the gradient of the solution and belongs to a set of admissible coefficients. It is proved that the convergence of solutions for the corresponding direct problems continuously depends on the coefficient convergence. Based on this result the existence of a quasisolution of the inverse problem is obtained in the appropriate class of admissible coefficients.

关键词： Parabolic equations Inverse coefficient problems Existence of quasisolutions

Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： Lin-Yan huang Yi-De Zhang Jie Chen Hai-Di Fan Wan Wang Bin Wang Ju-yun Ma Peng-Peng Li Hai-Wei Pu Xin-Yian Guo Jian-Gang Shen Su-hua Qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

Optical propagation through non-Kolmogorov turbulence

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Science China(Information Sciences) 2013年第4期56卷 69-74页

作者： TANG hua ou BaoLin School of Electronic and Information Engineering Beihang University

In this paper,the effects of the generalized exponent,the height and the zenith angle on the log-amplitude variance in the weak fluctuation are *** theoretical results indicate that for the downlink,the log-amplitude variance of the Kolmogorov model is always smaller than that of the three-layer model,while for the uplink,there is a point of intersection in the log-amplitude variance curves of the two *** different phenomena for the downlink and uplink are analyzed in ***,we find a method to ascertain precise values of the boundary layer altitudes for the three-layer model under various atmospheric conditions through the analysis for the point of *** at the point of intersection,the Kolmogorov model can be used to replace the three-layer model to simplify the analysis of the system ***,the log-amplitude variance increases with the increase of the zenith angle.

关键词： atmospheric turbulence three-layer model log-amplitude variance power spectral density generalized exponent

Quantum Signature of Classical Chaos in a Lipkin Model:Sensitivity of Eigenfunctions to Parameter Perturbations

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Chinese Physics Letters 1996年第5期13卷 329-332页

作者： XIE Rui-hua XU Gong-ou Department of Physics Nanjing UniversityNanjing 210008 Department of Modern Physics Lanzhou UniversityLanzhou 730000 National Laboratory of Heavy Ion Accelerator Lanzhou 730000 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 National Laboratory of Solid State Microstructure Nanjing UniversityNanjing 210008

In this paper,xve have studied the properties of eigenfunctions in a three-level Lipkin model whose classical counterpart can exhibit classical *** the regime of classical chaotic motions,sensitivity of eigenfunctions... 详细信息

关键词： chaos. Lipkin Chaos

Efficacy,safety and treatment satisfaction of transition to a regimen of insulin degludec/aspart:A pilot study

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World Journal of Diabetes 2025年第1期16卷 65-73页

作者： Na Yang Lu Lv Shu-Meng Han Li-yun He Zi-Yi Li Yu-Cheng Yang Fan Ping Ling-Ling Xu Wei Li hua-Bing Zhang Yu-Xiu Li Department of Endocrinology Key Laboratory of Endocrinology of National Health CommissionPeking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Allergy Beijing Key Laboratory of Precision Medicine for Diagnosis and Treatment of Allergic DiseasesNational Clinical Research Center for Dermatologic and Immunologic DiseasesPeking Union Medical College HospitalChinese Academy of Medical SciencesPeking Union Medical CollegeBeijing 100730China

BACKGRouND There is a lack of clinical evidence on the efficacy and safety of transitioning from a thrice-daily pre-mixed insulin or basal-prandial regimen to insulin degludec/aspart(IDegAsp)therapy,with insufficient data from the Chinese *** To demonstrate the efficacy,safety,and treatment satisfaction associated with the transition to IDegAsp in type 2 diabetes mellitus(T2DM).METHODS In this 12-week open-label,non-randomized,single-center,pilot study,patients with T2DM receiving thrice-daily insulin or intensive insulin treatment were transitioned to twice-daily injections of insulin *** doses,hemoglobin A1c(HbA1c)levels,fasting blood glucose(FBG),hypoglycemic events,a Diabetes Treatment Satisfaction Questionnaire,and other parameters were assessed at baseline and *** This study included 21 participants.A marked enhancement was observed in the FBG level(P=0.02),daily total insulin dose(P=0.03),and overall diabetes treatment satisfaction(Poutcomes,particularly FBG levels,daily cumulative insulin dose,and overall satisfaction with diabetes treatment.

关键词： Insulin degludec/aspart Type 2 diabetes management Basal-bolus insulin therapy Pre-mixed insulin Diabetes treatment satisfaction questionnaire

Semivolatile organic compounds, organochlorine pesticides and heavy metals in sediments and risk assessment in huaihe River of China

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Journal of Environmental Sciences 2006年第2期18卷 236-241页

作者： huaNG Hong ou Wen-hua WANG Lian-sheng College of Marine Science and Technology Shanghai Fisheries University Shanghai 200090 China School of Environmental Science and Technology Tongji University Shanghai 200092 China College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210093 China

The concentrations of semivolatile organic compounds, organochlorine pesticides and heavy metals in sediments from Jiangsu reach of huaihe River, China, were presented. The organic compounds were extracted by acetone： n-hexane using a Soxhlet apparatus and concentrations were performed using HP6890 gas chromatography coupled by FID and ECD detector. The total contents of 8 heavy metals by inductively coupled plasma atomic emission spectrometry or cold-vapor/atomic absorption spectrometry were developed. 30 semivolatile organic compounds were detected, including substituted benzenes, phenols, phthalates and polycyclic aromatic hydrocarbons, from 0.01 to 3.01 mg/kg. 16 organochlorine pesticides were almost detected and from 0.010 to 2.339 μg/kg. Concentrations of major metals were 50 mg/kg or less, mean level of mercury was only 0.055 mg/kg. Compared to sediment quality guidelines （SQGs）, concentrations of some semivolatilc organic compounds were high enough to cause possible toxic effects to living resources. The organochlorine pesticides presented relatively low, lower than threshold effect concentrations （TECs）, harmful effects on sediment-dwelling organisms were not expected. Chromium posed probable toxic effects to the living resources, other heavy metals had no threat temporarily according to SQGs.

关键词： sediment semivolatile organic compounds organochlorinc pcsticidcs heavy mctals sediment quality guiedlines huaihe River

The Ergodicity of a Class of Almost Anosov Systems

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Acta Mathematica Sinica,English Series 2013年第1期29卷 193-198页

作者： yun hua ZHou College of Mathematics and Statistics Chongqing University

In this paper, we prove that some volume-preserving almost Anosov systems are ergodic if they are essentially accessible. The key idea is that there are stable and unstable manifolds with uniform size on the orbits Of... 详细信息

关键词： Ergodicity almost Anosov essential accessibility

Effects and underlying mechanisms of damming on carbon and nitrogen cycles and transport in rivers of Southwest China:project introduction

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Acta Geochimica 2017年第4期36卷 577-580页

作者： hua-yun Xiao State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesLincheng West Road(Jinyang)99Guiyang 550081GuizhouChina Institute of Surface-Earth System Science Tianjin UniversityTianjin 300072China

Southwest China is the primary area for damming rivers to produce hydroelectric energy and store *** damming has changed hydrodynamic,chemical,and biological processes,which are related to sinks and sources of greenhouse gases and carbon and nitrogen fluxes of different ***,I provide an introduction to a river damming-related foundation,the National Key R&D Program of China(2016YTA0601000).Supported by the foundation,we carried out research on multiprocesses/multi-interfaces of carbon and nitrogen biogeochemical cycles in a dammed river system and have produced important results,as presented in this issue of the journal.

关键词： Damming Carbon and nitrogen cycles Southwest Chinese rivers

Strong interactions of incident shock wave with boundary layer along compression corner

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Chinese Journal of Aeronautics 2020年第12期33卷 3149-3157页

作者： Shanguang GUO yun WU hua LIANG Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'an 710038China

The coherent structure and instability of the interaction of incident shock wave with boundary layer developing on a compression corner are experimentally *** experiments are carried out in a supersonic wind tunnel of Mach number *** attention is paid to shock patterns and unsteady shock motions induced by the separation *** high-speed schlieren is used to visualize the flowfield evolution and to characterize the *** snapshot proper orthogonal decomposition of schlieren sequences is applied to investigate the primary coherent structure in the *** Fourier transform and continuous wavelet transformation are applied to characterize the *** results show that there are large-scale low-frequency oscillations of the shock waves and small-scale high-frequency pulsations in the separation *** peak frequency of shock oscillation is mainly concentrated in the range of 100–1000 *** pulsation of the small flow structure in the separation bubble is mainly concentrated above 12.5 k *** on the results of experimental analysis,the preliminary mechanism of the largescale instability of such interaction is obtained.

关键词： Shock wave Boundary layer Interaction Flow mechanism Instability