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The Arc Distortion in QH Inner ψ-uniform （or Convex） Domains in Real Banach Spaces

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Acta Mathematica Sinica,English Series 2011年第10期27卷 2039-2050页

作者： man Zi huang Xian Tao WANG Department of Mathematics Hu'nan Normal University Changsha 410081 P. R. China

Let D and D＇ be domains in real Banach spaces of dimension at least 2. The main aim of this paper is to study certain arc distortion properties in the quasihyperbolic metric defined in real Banach spaces. In particular, when D＇ is a QH inner C-uniform domain with C being a slow （or a convex domain）, we investigate the following： For positive constants c, h, C, M, suppose a homeomorphism f ： D → D＇ takes each of the 10-neargeodesics in D to （c, h）-solid in D＇. Then f is C-coarsely M- Lipschitz in the quasihyperbolic metric. These are generalizations of the corresponding result obtained recently by Viiisiilg.

关键词： Uniform domain QH C-uniform domain inner uniform domain QH inner C-uniform domain convex domain quasihyperbolic geodesic neargeodesic quasiconvexity real Banach space

Regional Characteristics of Cloud Radiative Effects before and after the South China Sea Summer Monsoon Onset

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Journal of Meteorological Research 2020年第6期34卷 1167-1182页

作者： man huang Jiandong LI Gang ZENG Yongkun XIE Key Laboratory of Meteorological Disaster of Ministry of Education(KLME) Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 Collaborative Innovation Center for Western Ecological Safety Lanzhou UniversityLanzhou 730000

The South China Sea summer monsoon(SCSSM)onset is characterized by rapid thermodynamical changes in the atmosphere that are critical to regional weather and climate *** far,few studies have focused on the changes in the associated cloud and radiative *** study investigates spatiotemporal characteristics of topof-atmosphere(TOA)cloud radiative effects(CREs)before and after the SCSSM onset over the South China Sea(SCS)and South China(SC),based on the 2001–2016 Clouds and the Earth’s Radiant Energy System(CERES)Energy Balanced and Filled(EBAF)satellite data and ERA-Interim reanalysis *** the SCSSM onset,strong net CRE(NCRE)dominated by its cooling shortwave component occurs over SC,while descending motion and weak NCRE prevail over the *** the SCSSM onset pentad,convection,high clouds,and longwave and shortwave CREs(LWCRE and SWCRE)abruptly increase over the southern and central SCS,and their high-value centers subsequently move northeastward and are strongly affected by the western Pacific subtropical *** strong offset between LWCRE and SWCRE enables the NCRE intensity(TOA radiation budget)to be quite small(large)between the SCS and the western North Pacific after the SCSSM *** contrast,low–middle-level clouds and strong cooling SWCRE remain over SC after the SCSSM onset,but the increasing high clouds and LWCRE weaken(intensify)the regional NCRE(TOA radiation budget)*** marked latitudinal differences in CREs between the SCS and SC primarily arise from their respective dominant cloud types and circulation conditions,which manifest the differences between the tropical SCSSM and subtropical East Asian monsoon *** results indicate that regional cloud fractions and CREs before and after the SCSSM onset are strongly modulated by quickly changed largescale circulation over the East Asian monsoon regions,and the spatiotemporal variation of CREs is a response to the monsoonal circulation adjustment to a large extent

关键词： cloud radiative effects(CREs) top-of-atmosphere(TOA)radiation budget South China Sea summer monsoon(SCSSM) South China(SC)

Coordinated chaos control of urban expressway based on synchronization of complex networks

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Chinese Physics B 2018年第11期27卷 672-682页

作者： Ming-bao Pang Yu-man huang School of Civil and Transportation Hebei University of Technology Tianjin 300401 China

We investigate the problem of coordinated chaos control on an urban expressway based on pinning synchronization of complex networks. A node coupling model of an urban expressway based on complex networks has been established using the cell transmission model（CTM）. The pinning controller corresponding to multi-ramp coordinated controller was designed by using the delayed feedback control（DFC） method, whose objective is to realize periodical orbits from chaotic states. The concrete pinning control nodes corresponding to the subsystems of regulating the inflows from the on-ramps to the mainline were obtained and the parameters of the controller were optimized by using the stability theory of complex networks to ensure the network synchronization. The validity of the proposed coordinated chaos control method was proven via the simulation experiment. The results of the examples indicated that the order motion on urban expressway can be realized, the wide-moving traffic jam can be suppressed, and the operating efficiency is superior to that of the traditional control methods.

关键词： pinning synchronization of complex networks multi-on-ramp metering of urban expressway chaos control delayed feedback control (DFC)

Research on H_2 speed governor for diesel engine of marine power station

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Journal of Marine Science and Application 2007年第3期6卷 51-57页

作者： huang man-lei College of Automation Harbin Engineering University Harbin 150001 China

The frequency stability of a marine power system is determined by the dynamic characteristic of the diesel engine speed regulation system in a marine power station. In order to reduce the effect of load disturbances and improve the dynamic precision of a diesel engine speed governor, a controller was designed for a diesel engine speed regulation system using H2 control theory. This transforms the specifications of the system into a standard H2 control problem. Firstly, the mathematical model of a diesel engine speed regulation system using an H2 speed governor is presented. To counter external disturbances and model uncertainty, the design of an H, speed governor rests on the problem of mixed sensitivity. Computer simulation verified that the H2 speed governor improves the dynamic precision of a system and the ability to adapt to load disturbances, thus enhancing the frequency stability of marine power systems.

关键词： marine power station diesel engine speed overnor H control

Toxicity Reduction of Municipal Wastewater by Anaerobic-anoxic-oxic Process

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Biomedical and Environmental Sciences 2010年第6期23卷 481-486页

作者： man-HONG huang YONG-MEI LI GuO-WEi GU State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongii University Shanghai 200092 China College of Environmental Science and Engineering Donghua University Shanghai 201620 China

Objective This study was conducted to optimize the operational parameters of anaerobic-anoxic-oxic （A^2/O） processes to reduce the toxicity of municipal wastewater and evaluate its ability to reduce toxicity. Methods A luminescent bacterium toxicity bioassay was employed to assess the toxicity of influent and effluent of each reactor in the A2/O system. Results The optimum operational parameters for toxicity reduction were as follows： anaerobic hydraulic retention time （HRT） = 2.8 h, anoxic HRT = 2.8 h, aerobic HRT = 6.9 h, sludge retention time （SRT） = 15 days and internal recycle ratio （IRR） = 100%. An important toxicity reduction （%） was observed in the optimized A2/O process, even when the toluene concentration of the influent was 120.7 mg·L^-1. Conclusions The toxicity of municipal wastewater was reduced significantly during the A^2/O process. A^2/O process can be used for toxicity reduction of municipal wastewater under toxic-shock loading.

关键词： A^2/O process Municipal wastewater Toxicity reduction Process optimization Toxic-shock loading

Analysis of the flow characteristics of the high-pressure supercritical carbon dioxide jet

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Journal of Hydrodynamics 2019年第2期31卷 389-399页

作者： man huang Yong Kang Xiao-chuan Wang Yi Hu Can Cai School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China Hubei Key Laboratory of Water Jet Theory and New Technology Wuhan UniversityWuhan 430072China

The supercritical carbon dioxide(SC-CO2)jet has a wide application prospect for rock breaking and jet fracturing in the development of the unconventional shale energy,due to its special physicochemical *** investigate its jet flow characteristics,the high-speed photography is used in experiments and the simulations through a compressible numerical model are carried *** is shown that the jet flow field can be divided into three typical regions,the mixing layer possesses the same characteristics as a gas/gas turbulent mixing layer,with the divergent angles evidently smaller than those of the incompressible *** predicted results by the numerical model are in a good agreement with those of the *** the dimensionless analysis,the potential core shows a length of about 9d and an increasing trend with the increase of the inlet pressure while the decay rate shows a decreasing trend,and the radial profiles consistent well with the 41 Ue-η''normalized *** addition,a significant temperature drop of the SC-CO2 is observed between the nozzle inlet and the exit.A simple and convenient semi-empirical equation for calculating this temperature variation is ***,the flow characteristics suggest that the SC-CO2 jet should be treated as a compressible jet.

关键词： Supercritical carb on dioxide jet flow characteristics experiment and simulation unconventional shale energy

Robust S-doped TiO_(2)@N,S-codoped carbon nanotube arrays as free-binder anodes for efficient sodium storage

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Journal of Energy Chemistry 2021年第2期30卷 175-184,I0007页

作者： Guangzeng Liu man huang Zhengchunyu Zhang Baojuan Xi Haibo Li Shenglin Xiong School of Chemistry and Chemistry Engineering Qilu Normal UniversityJinan 250200ShandongChina Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical Engineeringand State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100ShandongChina School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng 252059ShandongChina

Titanium dioxide(TiO_2) has been investigated broadly as a stable,safe,and cheap anode material for sodium-ion batteries in recent ***,the poor electronic conductivity and inherent sluggish sodium ion diffusion hinder its practical ***,a self-template and in situ vulcanization strategy is developed to synthesize self-supported hybrid nanotube arrays composed of nitrogen/sulfur-codoped carbon coated sulfur-doped TiO_2 nanotubes(S-TiO_2@NS-C) starting from H_2 Ti_2 O_5-H_2 O *** S-TiO_2@NS-C composite with one-dimensional nano-sized subunits integrates several ***,sulfur doping strongly improves the Na~+ storage ability of TiO_2@C-N nanotubes by narrowing the bandgap of original TiO_*** from the nanoarrays structures built from hollow nanotubes,carbon layer and sulfur doping,the sluggish Na~+ insertion/extraction kinetics is effectively improved and the volume variation of the electrode material is significantly *** a result,the S-TiO_2@NS-C nanoarrays present efficient sodium storage *** greatly improved sodium storage performances of S-TiO_2@NS-C nanoarrays confirm the importance of rational engineering and synthesis of hollow array architectures with higher complexity.

关键词： Hollow structures Nanotube arrays S-doped TiO_(2) N S-codoped carbon Sodium-ion batteries

Borderline Case of Traces and Extensions for Weighted Sobolev Spaces

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Acta Mathematica Sinica,English Series 2023年第9期39卷 1817-1833页

作者： man Zi huang Xian Tao Wang Zhuang Wang Zhi Hao Xu MOE-LCSM School of Mathematics and StatisticsHunan Normal UniversityChangsha410081P.R.China

In this paper,we study the traces and the extensions for weighted Sobolev spaces on upper half spaces when the weights reach to the borderline *** first give a full characterization of the existence of trace spaces for these weighted Sobolev spaces,and then study the trace parts and the extension parts between the weighted Sobolev spaces and a new kind of Besov-type spaces(on hyperplanes)which are defined by using integral averages over selected layers of dyadic cubes.

关键词： Sobolev space borderline case trace theorem Besov-type space Muckenhoupt A_p weight

Penile metastasis of osteosarcoma： a rare case report

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Asian Journal of Andrology 2013年第6期15卷 841-842页

作者： Ning Liu Li-Bo man Guang-Lin huang Department of Urology Beijing Jishuitan Hospital Beijing 100035 China

Dear Editor, Metastasis to the penis is rare, with no more than 500 cases reported to date. Primary tumours of sarcomatous origin are extremely rare, and no case ofosteosarcoma has been described in the literature. Here, we present a case of penile metastasis from osteosarcoma of the ischial tuberosity and discuss its possible metastatic mechanisms and clinical implications.

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