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THREE-DIMENSIONAL MODELING FOR THIN PLATE-LIKE STRUCTURES INCluDING SURFACE EFFECTS BY USING STATE SPACE METHOD

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Acta Mechanica Solida Sinica 2010年第3期23卷 260-270页

作者： Hongyu sheng Pin lu Institute of Civil Engineering Hefei University of Technology Hefei 230009 China Institute of Materials Research and Engineering A ^＊STAR (Agency for Science Technology and Research) 3 Research Link Singapore 117602

A three-dimensional （3-D） approach based on the state space method is proposed to study size-dependent mechanical properties of ultra-thin plate-like elastic structures considering surface effects. The structure is modeled as a laminate composed of a bulk bounded with upper and bottom surface layers, which are allowed to have different material properties from the bulk layer. State equations, including the surface properties of the structure, can be established on the basis of 3-D fundamental elasticity to analyze the size-dependent static characteristics of the thin plate-like structure. Compared with two-dimensional plate theories based size-dependent models for thin film structures in literature, the present 3-D approach is exact, which can provide benchmark results to assess the accuracy of 2-D plate theories and various numerical approaches. To show the feasibility of the proposed approach, a 3-D analytical solution for a simply supported plate-like thin structure including surface layers is derived. An algorithm is proposed for the calculation of the state equations obtained to ensure that the numerical results can reveal the surface effects clearly even for extremely thin surface layers. Numerical examples are carried out to exhibit the surface effects and some discussions are provided based on the results obtained.

关键词： micro-structures surface effects size-dependence state equation three-dimensional modeling

Real-world fuel consumption of light-duty passenger vehicles using on-board diagnostic (OBD) systems

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Frontiers of Environmental Science & Engineering 2020年第2期14卷 207-216页

作者： xuan Zheng sheng lu Liuhanzi Yang Min Yan Guangyi xu Xiaomeng Wu Lixin Fu Ye Wu College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China International Council on Clean Transportation Beijing 100084China Shenzhen Research Academy of Environmental Sciences Shenzhen 518001China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China

An increasing discrepancy between real-world and type-approval fuel consumption for light-duty passenger vehicles(LDPVs)has been reported by several ***,real-world fuel consumption is measured primarily by a portable emission measurement *** on-board diagnostic(OBD)approach,which is flexible and offers high-resolution data collection,is a promising fuel consumption monitoring *** LDPVs were tested with a laboratory dynamometer based on a type-approval cycle,the New European Driving Cycle(NEDC).Fuel consumption was measured by the OBD and constant-volume sampling system(CVS,a regulatory method)to verify the accuracy of the OBD *** results of the OBD method and the regulatory carbon balance method exhibited a strong linear correlation(e.g.,R^2=0.906-0.977).Compared with the carbon balance results,the fuel consumption results using the OBD were 7.1%±4.3%lower on ***,the real-world fuel consumption of six LDPVs was tested in Beijing using the *** results showed that the normalized NEDC real-world fliel consumption of the tested vehicles was 13%±17%higher than the type-approval-based fuel *** the OBD values are lower than the actual fuel consumption,using a carbon balance method may result in a larger discrepancy between real-word and type-approval ftiel *** means of the operating mode binning and micro trip methods,a strong relationship(R^2=0.984)was established between the average speed and relative fuel *** congested roads(average vehicle speed less than 25 km/h),the fuel consumption of LDPVs is highly sensitive to changes in average speed.

关键词： Fuel consumption Light-duty passenger vehicles On-board diagnostic systems

Review:Image anti-aliasing techniques for Internet visual media processing: a review

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第9期15卷 717-728页

作者： xu-dong JIANG Bin sheng Wei-yao LIN Wei lu Li-zhuang MA Department of Computer Science and Engineering Shanghai Jiao Tong University State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Department of Electronic Engineering Shanghai Jiao Tong University Autodesk Software (China) Co. Ltd. Shanghai Branch

Anti-aliasing is a well-established technique in computer graphics that reduces the blocky or stair-wise appearance of pixels. This paper provides a comprehensive overview of the anti-aliasing techniques used in computer graphics, which can be classified into two categories: post-filtering based anti-aliasing and pre-filtering based anti-aliasing. We discuss post-filtering based anti-aliasing algorithms through classifying them into hardware anti-aliasing techniques and post-process techniques for deferred rendering. Comparisons are made among different methods to illustrate the strengths and weaknesses of every category. We also review the utilization of anti-aliasing techniques from the first category in different graphic processing units, i.e., different NVIDIA and AMD series. This review provides a guide that should allow researchers to position their work in this important research area, and new research problems are identified.

关键词： Anti-aliasing Hardware Post-filtering Pre-filtefing Sampling

Management about intravesical histological transformation of prostatic mucinous carcinoma after radical prostatectomy:A case report

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World Journal of Clinical Cases 2022年第14期10卷 4654-4660页

作者： sheng-Jiang Bai Li Ma Min luo Hang xu lu Yang Department of Urology Institute of UrologyWest China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina

BACKGROUND Prostatic mucinous carcinoma(MC)and prostatic signet ring cell carcinoma are two variants of prostate *** has a higher overall survival time among all variants,while signet ring cell carcinoma is associated with lower survival time relative to other *** a small proportion of prostatic MC may contain signet ring *** the last several decades there were only 12 patients that were documented in two *** SUMMARY We report on a 64-year-old man who was diagnosed with prostatic MC after he received a robotic-assisted laparoscopic radical prostatectomy in the West China *** robotic-assisted laparoscopic radical prostatectomy,the patient underwent three successive transurethral resections of bladder *** examination of the first transurethral resection of bladder tumors specimen indicated that the neoplasm was prostatic MC that had metastasized to the urinary *** subsequent two transurethral resections of bladder tumors indicated the presence of prostatic mucinous carcinoma with signet ring *** This case report aimed to share the management experience,raise awareness,and highlight the importance of multidisciplinary cooperation of prostatic mucinous carcinoma with signet ring cells.

关键词： Prostatic mucinous carcinoma Signet ring cells Bladder tumor Immunohistochemical analyses Therapy and management Case report

Disordered carbon anodes for Na-ion batteries—quo vadis?

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Science China Chemistry 2021年第10期64卷 1679-1692页

作者： Fei Xie Zhen xu Zhenyu Guo Yaxiang lu Liquan Chen Maria-Magdalena Titirici Yong-sheng Hu Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Chemical Engineering Imperial College LondonLondon SW72AZUK

Na-ion batteries(NIBs)are gradually attracting much attention as an alternative to lead-acid batteries and supplement to Li-ion batteries(LIBs)owing to the abundant Na resources and excellent *** the most commonly used graphite as an anode material in LIBs cannot be inherently used in NIBs,tremendous efforts have been made to advance the fundamental understanding and design of suitable anode materials for NIBs,including the improvement of Na storage capacity and the study on Na storage *** to all these studies,disordered carbons are now the most promising anode candidates for *** this review,we discuss the current challenges and remaining problems to be solved in the area of disordered carbon anode materials for NIBs and provide future insights and research directions.

关键词： disordered carbon anode Na-ion batteries

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Coverage Analyses on Directional Transmissions Ultra-Dense Networks with Imperfect Beam Alignment

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China Communications 2022年第5期19卷 318-328页

作者： Yining xu sheng Zhou Beijing National Research Center for Information Science and Technology Department of Electronic EngineeringTsinghua UniversityBeijing 100084China

Blockage and imperfect beam alignment are two principal difficulties in high-frequency bands directional *** this paper,the coverage performance of downlink directional transmissions in ultra-dense networks is analyzed,with the consideration of beam alignment error and link blockage through stochastic *** experiments demonstrate that narrower beam leads to higher coverage probability with perfect beam alignment,but it is not the case with imperfect beam ***,the optimal beamwidth that maximize the coverage probability is characterized and a closed-form approximation of the optimal beamwidth is derived under imperfect beam alignment,***,the optimal beamwidth is a monotonically increasing function of the standard deviation of the beam alignment error,and a monotonically decreasing function of the beamwidth of correspondent communication end,indicating that the beamwidth of the communication pairs ought to be jointly designed.

关键词： imperfect beam alignment directional transmission ultra-dense networks stochastic geometry

Rational design of metal selenides nanomaterials for alkali metal ion(Li^(+)/Na^(+)/K^(+))batteries:current status and perspectives

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Rare Metals 2024年第5期43卷 1906-1931页

作者： Rui Sun Feng xu Cai-Hong Wang sheng-Jun lu Yu-Fei Zhang Hao-Sen Fan College of Materials Science and Metallurgy Engineering Guizhou UniversityGuiyang550025China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou510006China

Recently,metal selenides have obtained widespread attention as electrode materials for alkali(Li^(+)/Na^(+)/K^(+))batteries due to their promising theoretical capacity and ***,metal selenides,similar to metal oxides and sulfides,also suffer from severe volume explosion during repeated charge/discharge processes,which results in the structure collapse and the following pulverization of electrode ***,it leads to poor cycle stability and influencing their further *** order to solve these issues,some special strategies,including elemental doping,coupling with carbon materials,synthesis of the bimetal selenides with heterostructure,etc.,have been gradually applied to design novel electrode materials with outstanding electrochemical ***,the recent research progress on metal selenides as anodes for alkali ion batteries is summarized,including the regulation of crystal structure,synthesis strategies,modification methods,and electrochemical mechanisms and ***,the challenges of metal selenides and the perspective for future electrode material design are *** is hoped to pave a way for the development of metal selenide electrode materials for the potential applications for alkali metal ion(Li^(+)/Na^(+)/K^(+))batteries.

关键词： Rational design Metal selenides Nanostructure Li^(+) batteries Na^(+) batteries K^(+) batteries

Factorization of radiative leptonic D-meson decay with sub-leading power corrections

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Chinese Physics C 2021年第7期45卷 20-30页

作者： Long-sheng lu School of Physics Nankai University300071 TianjinChina

In this work,we calculate the sub-leading power contributions to radiative leptonic D→γν*** the first time,we provide the analytic expressions of next-to-leading power contributions and the error estimation associated with the power expansion of O(∧_(QCD)/m_(c)).In our calculation,we adopt two different models of the D-meson distribution amplitudesφ^(+)_(D,Ⅰ)andφ^(+)_(DⅡ).Within the framework of QCD factorization as well as the dispersion relation,we evaluate the soft contribution up to the next-to-leading logarithmic accuracy and also consider the higher-twist contribution from the two-particle and three-particle distribution ***,we find that all the sub-leading power contributions are significant atλd(μ0)354 MeV,and the next-to-leading power contributions lead to 143%inφ^(+)_(D,Ⅰ)and 120%inφ^(+)_(DⅡ)corrections to leading power vector form factors with Eγ=0.5 *** the corrections from the higher-twist and local sub-leading power contributions are enhanced with increasing inverse moment,it is difficult to extract an appropriate inverse moment of the D-meson distribution *** predicted branching fractions are(1.88^(+0.36)_(0.29))×10^(-5)forφ^(+)_(D,Ⅰ)and(2.31^(+0.65)_(-0.54))×10^(-5)forφ^(+)_(DⅡ).

关键词： factorization D-meson radiative leptonic decay sub-leading power correction

Effect of hydrogen on deformation behavior of Alloy 725 revealed by in-situ bi-crystalline micropillar compression test

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Journal of Materials Science & Technology 2021年第8期67卷 243-253页

作者： xu lu Dong Wang Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyNo-7491TrondheimNorway

Nickel-based Alloy 725 bi-crystalline micropillars with different types of grain boundaries(GBs)were compressed in hydrogen-free and in-situ hydrogen-charged conditions to investigate the hydrogen effect on the deformation behavior of the selected *** the presence of hydrogen,the compressive stresses on the micropillars increase regardless of the GB *** was proposed that this hydrogen-induced hardening behavior is the synergistic effect of hydrogen-enhanced dislocation multiplication and interactions,the pinning effect of hydrogen on dislocation motion,and hydrogen-enhanced lattice *** electron backscatter diffraction(t-EBSD)results demonstrate that both low-angle GBs and high-angle GBs can effectively suppress dislocation transmission through the GBs,resulting in dislocations pile up along the GBs in the hydrogen-charged *** contrast,this behavior was not observed in the micropillars with twin boundaries.

关键词： Hydrogen Nickel-based alloy Micropillar compression Plastic deformation Grain boundary