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Koebe Type Theorems and Pre-Schwarzian of Harmonic K-quasiconformal Mappings,and Their Applications

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Acta Mathematica Sinica,English Series 2022年第11期38卷 1965-1980页

作者： shao lin CHEN Saminathan PONNUSAMY College of Mathematics and Statistics Hengyang Normal UniversityHengyang 421002P.R.China Hunan Provincial Key Laboratory of Intelligent Information Processing and Application Hengyang 421002P.R.China Department of Mathematics Indian Institute of Technology MadrasChennai-600036India

In this article,we first establish an asymptotically sharp Koebe type covering theorem for harmonic K-quasiconformal *** we use it to obtain an asymptotically Koebe type distortion theorem,a coefficients estimate,a Lipschitz characteristic and a linear measure distortion theorem of harmonic K-quasiconformal *** last,we give some characterizations of the radial John disks with the help of pre-Schwarzian of harmonic mappings.

关键词： Harmonic K-quasiconformal mapping Koebe type covering theorem Koebe type distortion theorem Radial John disk

The Maximum Principle for One Kind of Stochastic Optimization Problem and Application in Dynamic Measure of Risk

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Acta Mathematica Sinica,English Series 2007年第12期23卷 2189-2204页

作者： shao lin JI Zhen WU School of Mathematics and Systems Science Shandong University Jinan 250100 P. R. China

The authors get a maximum principle for one kind of stochastic optimization problem motivated by dynamic measure of risk. The dynamic measure of risk to an investor in a financial market can be studied in our framewor... 详细信息

关键词： backward stochastic differential equation perturbation method Ekeland's variational principle dynamic measure of risk

Developing sustainable bioenergy in Northwest China

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Journal of Integrative Agriculture 2017年第6期16卷 1195-1196页

作者： CHEN shao-lin Biomass Energy Center forArid and Semi-arid Lands College of Life Sciences Northwest A&F University Yangling 712100 P.R.China

This special focus on bioenergy is a product of 2014 and2016 Yangling International Agri-science Forums held at the Northwest A＆F University（NWAFU）,Yangling,Shaanxi,*** forums brought together scientists over the w... 详细信息

关键词： in of is et Developing sustainable bioenergy in Northwest China for

Homoclinic and Heteroclinic Flows in Global Attractor for Davey-stewartson Ⅱ Equation

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Acta Mathematicae Applicatae Sinica 2008年第4期24卷 599-612页

作者： Zheng-de Dai shao-lin Li School of Mathematics and Statistics Yunnan University Kunming 650091 China Department of Information and Computing Science Guangxi Institute of Technology Liuzhou 545006 China Department of Mathematics Honghe College Mengzi 661100 China

By the variable transformation and generalized Hirota method, exact homoclinic and heteroclinic solutions for Davey-Stewartson II （DSII） equation are obtained. For perturbed DSII equation, the existence of a global attractor is proved. The persistence of homoclinic and heteroclinic flows is investigated, and the special homoclinic and heteroclinic structure in attractors is shown.

关键词： Persistence Homoclinic And Heteroclinic Flows Attractor Davey-Stewarson equation

Protein Profiles Correlated with Recurrence of Early Stage Non-Small Cell Lung Cancer

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Chinese Journal of Cancer Research 2010年第1期22卷 21-26页

作者： Zhe-ming Lu shao-lin Hong Key Laboratory of Carcinogenesis and Translational Research （Ministry of Education） Department of Etiology Peking University School of Oncology Beijing Cancer Hospital ＆ Institute Beijing 100142 China Duke Comprehensive Cancer Center Duke University Medical Center Durham NC 27710 USA

Objective： To elucidate protein markers that differentiate stage I non-small cell lung cancer （NSCLC） that subsequently develop metastatic disease to those that do not develop metastasis by protein expression profiles. Methods： Matrix assisted laser desorption/ionization time-of-flight mass spectrometry （MALDI-TOF MS） and two dimensional difference gel electrophoresis （2D-DIGE） platforms were used to separate proteins in whole tumor specimens. Quantitating mRNA expression was used for validation. Results： Twelve proteins were identified as expressed differentially between two groups from protein expression platforms. But from gene expression platform no marker could distinguish patients with recurrent vs. nonrecurrent disease. Conclusion： Analysis of multiple protein markers may be more informative to predict prognosis of early stage lung cancer.

关键词： Non-small cell lung cancer Recurrence Biomarker

Oxidation-induced damage of an uncoated and coated nickel-based superalloy under simulated gas environment

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Rare Metals 2018年第3期37卷 204-209页

作者： shao-lin Li Hong-Yu Qi Xiao-Guang Yang School Of Energy and Power Engineering Beihang UniversityBeijing 100191 China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100191 China

Turbine blades and vans operated in an aggressive gas environment usually suffer from combined oxidation and cycle loading effects. The surface oxide layer will result in premature failure and lead to a significant reduction in the service lifetime. The effects of prior oxidation-induced damage under a simulated combustion-gas environment on the fatigue lifetime of the directionally solidified（DS） nickel-based superalloy DZ125 with and without an oxidation-resistant coating were presented. The fatigue lifetime of uncoated samples is adversely affected by prior oxidation exposure. The deterioration of fatigue lifetime in uncoated samples is associated with surface microstructural degradation, which occurs during prior exposure. However,the presence of MCrAlY coating is beneficial for the sample＇s lifetime under high stress. Further scanning electron microscopy（SEM） analysis demonstrates that the coating does not contribute to the initiation mode of fatigue cracks.

关键词： Gas environment Fatigue Lifetime Coating Superalloy

Environmental effect of vegetation restoration on degraded ecosystem in low subtropical China

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Journal of Environmental Sciences 2003年第4期15卷 514-519页

作者： PENG shao-lin YANG Liu-chun LU Hong-fang South China Institute of Botany Chinese Academy of SciencesGuangzhou 510650China.

The environmental effect of degraded ecosystem's vegetation restoration in low subtropical China was studied. Results indicated that the vegetation recovery on degraded lands significantly ameliorates surrounding environment, increases species diversity, improves soil structure, raises soil fertility, enhances productivity, and promotes regional agricultural production and social economic development dramatically. Through the combining engineering and biological measures, the restoration of degraded ecosystem in low subtropical area is possible and economical. The restoration experience in Xiaoliang, Wuhua and other sites are valuable for other degraded subtropical area was introduced.

关键词： vegetation restoration degraded ecosystem low subtropical zone environment impact

Evaluation of service-induced microstructural damage for directionally solidified turbine blade of aircraft engine

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Rare Metals 2019年第2期38卷 157-164页

作者： Wei-Qing Huang Xiao-Guang Yang shao-lin Li School of Energy and Power Engineering Beihang University Beijing Key Laboratory of Aero-Engine Structure and Strength

Turbine blades of gas turbine engines usually suffer from severe operational conditions characterized by high temperature and stress. Severe operational conditions during service cause microstructural changes in turbine blades and degrade their mechanical properties. In this study, service-induced microstructural damages in serviced turbine blades manufactured from a directionally solidified superalloy were evaluated. The observed microstructural damage of the turbine blade mainly involves the coarsening and rafting of γ' precipitates. The leading edge of 60% height of the turbine blades undergone most severe microstructural damage with significant microstructural evolution at this area. Microstructural damage affects the mechanical properties such as Vickers hardness, that is,Vickers hardness decreases as the equivalent diameter decreases. Microstructural damage shows great positiondependent feature as service temperature and radial stress on blade changes. With the aid of energy-dispersive spectrometer(EDS) analysis on carbide, the transformation of carbide does not exist. In addition, no topological closed-packed phase exists in the turbine blade.

关键词： Service-induced Microstructural damage Directionally solidified Turbine blade: Aircraft engine

Tensile properties and failure analysis of Ti–6Al–4V joints by electron beam welding

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Rare Metals 2016年第6期35卷 450-455页

作者： Xiao-Guang Yang shao-lin Li Hong-Yu Qi School of Energy and Power Engineering Beijing University of Aeronautics and Astronautics

The microstructural and mechanical characterization of electron beam welded joints of forged Ti-6Al- 4V were investigated. Microhardness tests indicate that the hardness of the fusion zone （FZ） is higher than that of the heat-affected zone （HAZ） and base metal. The tensile results show that the mechanical properties of the welded joints are comparable with those of the base metal in terms of static strength and are in accordance with the relationship between microstructure and mechanical properties of welded joints. The ultimate tensile strength of the weld is equal to that of the hourglass joint, which indicates that the mechanical properties of the longitudinal FZ and those of the transverse FZ are the same. Macromechanical behavior and macrofracture and microfracture of the base material, joint, and weld specimens are observed. A comparison among the three types of specimen fracture phenomena reveals the following distinctive differences：（1） the fracture mode, （2） the micrograph of the dimple pattern at the central region, and （3） the size of the dimple at the central region and the transition region.

关键词： Electron beam welding Microstructure Mechanical properties Failure model