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Evaluation of ERA-Interim Monthly Temperature Data over the Tibetan Plateau

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Journal of Mountain Science 2014年第5期11卷 1154-1168页

作者： GAO lu HAO lu CHEN xing-wei College of Geographical Sciences Fujian Normal University Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Research Center for National Geographical Condition Monitoring and Emergency Support in the Economic Zone on the West Side of the Taiwan Strait College of Applied Meteorology Nanjing University of Information Science & Technology

In this study, surface air temperature from 75 meteorological stations above 3000 m on the Tibetan Plateau are applied for evaluation of the European Centre for Medium-Range Weather Forecasts(ECMWF) third-generation reanalysis product ERA-Interim in the period of 1979-2010. High correlations ranging from 0.973 to 0.999 indicate that ERA-Interim could capture the annual cycle very well. However, an average root-meansquare error(rmse) of 3.7°C for all stations reveals that ERA-Interim could not be applied directly for the individual sites. The biases can be mainly attributed to the altitude differences between ERA-Interim grid points and stations. An elevation correction method based on monthly lapse rates is limited to reduce the bias for all stations. Generally, ERA-Interim captured the Plateau-Wide annual and seasonal climatologies very well. The spatial variance is highly related to the topographic features of the TP. The temperature increases significantly(10°C- 15°C) from the western to the eastern Tibetan Plateau for all seasons, in particular during winter and summer. A significant warming trend(0.49°C/decade) is found over the entire Tibetan Plateau using station time series from 1979-2010. ERA-Interim captures the annual warming trend with an increase rate of 0.33°C /decade very well. The observation data and ERA-Interim data both showed the largest warming trends in winter with values of 0.67°C/decade and 0.41°C/decade, respectively. We conclude that in general ERA-Interim captures the temperature trends very well and ERA-Interim is reliable for climate change investigation over the Tibetan Plateau under the premise of cautious interpretation.

关键词： Reanalysis Air temperature Warming trend Tibetan Plateau

Enhanced elastocaloric effect and refrigeration properties in a Si-doped Ni-Mn-In shape memory alloy

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Journal of Materials Science & Technology 2022年第22期117卷 167-173页

作者： Zhenzhuang Li Zongbin Li Yunzhuo lu xing lu Liang Zuo School of Material Science and Engineering Dalian Jiaotong UniversityDalian 116028China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Material Science and EngineeringNortheastern UniversityShenyang 110819China

We demonstrate giant elastocaloric effect and outstanding refrigeration capacity in a A textured Ni_(50)Mn_(35)In_(13)Si_(2) alloy with large transformation entropy change △S_(tr) and low-hysteresis △T_(hys). On unloading from a relatively low compressive stress of 300 MPa, giant adiabatic temperature variation △T_(ad) up to –17.7 K was realized. Moreover, large stress-induced entropy change △S_(σ) of 25.9 J kg^(–1)K^(–1) andgiant refrigeration capacity RC_(σ) of 1330 J kg^(–1) were achieved under the compressive stress of 300 *** achieving giant △T_(ad) and outstanding refrigeration capacity indicates that this alloy ispromising to be the candidate material for elastocaloric refrigeration.

关键词： Ni-Mn-In alloys Directional solidification Elastocaloric effect Martensitic transformation

Quantification of how mechanical ventilation influences the airborne infection risk of COVID-19 and HVAC energy consumption in office buildings

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Building Simulation 2023年第5期16卷 713-732页

作者： Zhihong Pang xing lu Zheng O’Neill mike walker’66 department of mechanical engineering texas a&m universitycollege stationtx 77843usa

This paper presents an EnergyPlus-based parametric analysis to investigate the infection risk of Coronavirus Disease 2019(COVID-19)under different mechanical ventilation scenarios for a typical medium-sized office building in various climate zones.A Wells-Riley(WR)based Gammaitoni-Nucci(GN)model was employed to quantitatively calculate the airborne infection *** selected parameters for the parametric analysis include the climate zone,outdoor air fraction,fraction of infectors,quanta generation rate,and exposure *** loss and deposition of particles are not *** results suggest that the COVID-19 infection risk varies significantly with climate and season under different outdoor air fraction scenarios since the building heating and cooling load fundamentally impacts the supply airflow rate and thus directly influences the amount of mechanical ventilation,which determines the dilution ratio of *** risk assessment identified the climate zones that benefit the most and the least from increasing the outdoor air *** climate zones such as 1A(Honolulu,HI),2B(Tucson,AZ),3A(Atlanta,GA),and 7(International Falls,MN)are the most energy-efficient locations when it comes to increasing the outdoor air fraction to reduce the COVID-19 infection *** contrast,the climate zones such as 6A(Rochester,MN)and 6B(Great Falls,MT)are the least energy-efficient *** paper facilitates understanding a widely recommended COVID-19 risk mitigation strategy(i.e.,increase the outdoor airflow rate)from the perspective of energy consumption.

关键词： COVID-19 smart ventilation built environment infection risks building simulation office building

Laser additive manufacturing of ductile Fe-based bulk metallic glass composite

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Journal of Materials Science & Technology 2022年第26期121卷 148-153页

作者： Qingjie Li Dandan Qin Yunzhuo lu Xuemei Zhu xing lu School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China

Laser additive manufacturing(LAM)is a promising technology for processing bulk metallic glass(BMG)with freeform geometries or unlimited ***,the inherently brittle Fe-based BMGs produced by LAM have always been plagued by the micro-cracking induced by the large thermal stresses during the LAM *** solve this dilemma,316L stainless steel(SS)with excellent toughness and similar elemental composition was carefully selected as the second phase to form Fe-based BMG composites(BMGCs).The obtained Fe-based BMGCs are equipped with a heterogeneous structure,i.e.,the 316L SS phase is wrapped by the metallic glass and forms a unique"fishbone"structure with a ***,the special structure nicely improves a plastic strain of the Fe-based BMGC with a strength of 2355 MPa to~17%,achieving a record-breaking achievement among Fe-based amorphous with critical dimensions over 1mm.

关键词： Laser additive manufacturing Metallic glass composite Crack free Stainless steel

Unsupervised noise-robust feature extraction for aerial image classification

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Science China(Technological Sciences) 2020年第8期63卷 1406-1415页

作者： LIANG Ye lu Shuai weng Rui HAN ChengZhe LIU Ming School of Astronautics Harbin Institute of TechnologyHarbin 150001China Academy of Art Harbin University of Science and TechnologyHarbin 150001China Academy of Software and Microelectronics Harbin University of Science and TechnologyHarbin 150001China

The rich data provided by satellites and unmanned aerial vehicles bring opportunities to directly model aerial image features by extracting their spatial and structural *** convolutional autoencoders(CAEs)have been attained a remarkable performance in ideal aerial image feature extraction,they are still challenging to extract information from noisy images which are generated from capture and *** this paper,a novel CAE-based noise-robust unsupervised learning method is proposed for extracting high-level features accurately from aerial images and mitigating the effect of *** from conventional CAEs,the proposed method introduces the noise-robust module between the encoder and the ***,several pooling layers in CAEs are replaced by convolutional layers with stride=*** performance of feature extraction is evaluated by the prediction accuracy and the accuracy loss in image classification experiments.A 5-classes aerial optical scene and a 9-classes hyperspectral image(HSI)data set are utilized for optical image and HSI feature extraction,*** features extracted from aerial images are utilized for image classification by a linear support vector machine(SVM)*** results indicate that the proposed method improves the classification accuracy for noisy images(Gaussian noise 2Dσ=0.1,3Dσ=60)in both optical images(2D 87.5%)and HSIs(3D 85.6%)compared with the traditional CAE(2D 78.6%,3D 84.2%).The accuracy loss in classification experiments increases with the increment of *** with the traditional CAE(2D 15.7%,3D 11.8%),the proposed method shows the lower classification accuracy loss in experiments(2D 0.3%,3D 6.3%).The proposed unsupervised noise-robust feature extraction method attains desirable classification accuracy in ideal input and enhances the feature extraction capability from noisy input.

关键词： aerial image classification convolutional autoencoder feature extraction noise-robust

Exact Boundary Synchronization by Groups for a Kind of System of Wave Equations Coupled with Velocities

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Chinese Annals of Mathematics,Series B 2023年第1期44卷 17-34页

作者： xing lu Tatsien LI School of Mathematics Southeast UniversityNanjing 211189China School of Mathematical Sciences Fudan UniversityShanghai 200433China Shanghai Key Laboratory for Contemporary Applied Mathematic Fudan UniversityShanghai 200433China Nonlinear Mathematical Modeling and Methods Laboratory Fudan UniversityShanghai 200433China

This paper deals with the exact boundary controllability and the exact boundary synchronization for a 1-D system of wave equations coupled with *** problems can not be solved directly by the usual HUM method for wave equations,however,by transforming the system into a first order hyperbolic system,the HUM method for 1-D first order hyperbolic systems,established by Li-lu(2022)and lu-Li(2022),can be applied to get the corresponding results.

关键词： Exact boundary controllability Exact boundary synchronization Coupled system of wave equations HUM method

Functional Envelope of Cantor Spaces

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Acta Mathematica Sinica,English Series 2017年第3期33卷 327-340页

作者： xing Fu ZHONG Jie lu School of Mathematics Sun Yat-Sen University Guangzhou 510275 P. R. China School of Mathematics South China Normal University Guangzhou 510630 P. R. China

Given a topological dynamical system （X, T）, where X is a compact metric space and T a continuous selfmap of X. Denote by S（X） the space of all continuous selfmaps of X with the compactopen topology. The functional envelope of （X,T） is the system （S（X）,FT）, where FT is defined by FT（φ） = T o φ for any φ ∈ S（X）. We show that （1） If （∑, T） is respectively weakly mixing, strongly mixing, diagonally transitive, then so is its functional envelope, where ∑ is any closed subset of a Cantor set and T a selfmap of ∑ （2） If （S（∑）,Fσ） is transitive then it is Devaney chaos, where （∑, σ） is a subshift of finite type; （3） If （∑, T） has shadowing property, then （Su （∑）, FT） has shadowing property, where ∑ is any closed subset of a Cantor set and T a selfmap of ∑; （4） If （X,T） is sensitive, where X is an interval or any closed subset of a Cantor set and T： X → X is continuous, then （Su（X）,FT） is sensitive; （5） If ∑, is a closed subset of a Cantor set with infinite points and T ：∑ →∑ is positively expansive then the entropy entv（FT） of the functional envelope of （∑, T） is infinity.

关键词： Mixing topological entropy Cantor spaces functional envelopes

Some geometrical iteration methods for nonlinear equations

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Applied Mathematics(A Journal of Chinese Universities) 2008年第1期23卷 25-30页

作者： lu xing-jiang QIAN Chun Dept. of Math Zhejiang Univ. Hangzhou 310027 China. College of Statist. and Comput. Sci. Zhejiang Gongshang Univ. Hangzhou 310018China.

This paper describes geometrical essentials of some iteration methods （e.g. Newton iteration, secant line method, etc.） for solving nonlinear equations and advances some geometrical methods of iteration that are fle... 详细信息

关键词： nonlinear equation iteration geometric method.

Energy Scattering of a Generalized Davey–Stewartson System in Three Dimension

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Acta Mathematica Sinica,English Series 2017年第9期33卷 1206-1224页

作者： Jing lu xing Dong TANG School of Mathematical Sciences Beijing Normal UniversityBeijing 100875P.R.China Institute of Applied Physics and Computational Mathematics Beijing 100088P.R.China

In this paper, we study the global scattering result of the solution for the generalized Davey-Stewartson system The main difficulties are the failure of the interaction Morawetz estimate and the asymmetrical structure of nonlinearity （in particular, the nonlinearity is non-local）. To compensate, we utilize the strategy derived from concentration-compactness idea, which was first introduced by Kenig and Merle .

关键词： Davey-Stewartson system scatter global well-posedness