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The Existence of a Meridional Curve in Closed Incompressible Surfaces in Fully Alternating link Complements

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Chinese Annals of Mathematics,Series B 2024年第1期45卷 73-80页

作者： wei lin School of Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina

Menasco showed that a closed incompressible surface in the complement of a non-split prime alternating link in S^(3) contains a circle isotopic in the link complement to a meridian of the *** on this result,he was able to argue the hyperbolicity of non-split prime alternating links in *** et *** that if F■S×I\L is an essential torus,then F contains a circle which is isotopic in S×I\L to a meridian of *** author generalizes his result as follows:Let S be a closed orientable surface,L be a fully alternating link in S×I\If F ■ S×I\L is a closed essential surface,then F contains a circle which is isotopic in S×I\L to a meridian of L.

关键词： Fully alternating Incompressible surfaces Meridionally incompressible

Asymptotic Tracking Control for Wind Turbines in Variable Speed Mode

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 569-576页

作者： wei lin Zongtao Lu wei wei Dongguan University of Technology Dongguan 523808China Department of Electrical Engineering and Computer Science Case Western Reserve University

This paper presents a variable speed control strategy for wind turbines in order to capture maximum wind *** turbines are modeled as a two-mass drive-train system with generator torque *** on the obtained wind turbine model,variable speed control schemes are *** tracking controllers are designed to achieve asymptotic tracking for a prescribed rotor speed reference signal so as to yield maximum wind power *** to the difficulty of torsional angle measurement,an observer-based control scheme that uses only rotor speed information is further developed for global asymptotic output *** effectiveness of the proposed control methods is illustrated by simulation results.

关键词： Asymptotic tracking partial-state and output feedback two-mass drive-train model variable speed control wind turbines

Non-convexity Pricing and Allocating Costs in Stochastic Electricity Markets

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1466-1477页

作者： wei lin Zhifang Yang Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology College of Electrical EngineeringChongqing UniversityChongqing 400030China

Stochastic electricity markets have drawn attention due to fast increase of renewable *** results in two issues:one is to reduce uplift payments arising from non-convexity under renewable uncertainties,and the other one is to allocate reserve costs based on renewable *** resolve the first issue,a convex hull pricing method for stochastic electricity markets is *** dual variables of system-wide constraints in a chance-constrained unit commitment model are shown to reduce expected uplift payments,together with developing a linear program to efficiently calculate such *** resolve the second issue,an allocation method is proposed to allocate reserve costs to each renewable power plant by explicitly investigating how renewable uncertainties of each renewable power plant affect reserve *** proposed methods are validated in a 24-period 3-unit test example and a 24-period 48-unit utility example.

关键词： Convex hull pricing cost allocation non-convexity renewable uncertainty stochastic electricity market

Further developments of a multi-phase transport model for relativistic nuclear collisions

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Nuclear Science and Techniques 2021年第10期32卷 110-142页

作者： Zi-wei lin Liang Zheng Department of Physics East Carolina UniversityGreenvilleNC 27858USA School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China

A multi-phase transport(AMPT)model was constructed as a self-contained kinetic theory-based description of relativistic nuclear collisions as it contains four main components:the fluctuating initial condition,a parton cascade,hadronization,and a hadron ***,we review the main developments after the first public release of the AMPT source code in 2004 and the corre-sponding publication that described the physics details of the model at that *** also discuss possible directions for future developments of the AMPT model to better study the properties of the dense matter created in relativistic collisions of small or large systems.

关键词： QGP Transport model Heavy-ion collisions

A power-aware code-compression design for RISC/VLIW architecture

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第8期12卷 629-637页

作者： Che-wei lin Chang Hong lin wei Jhih WANG Department of Electronic Engineering National Taiwan University of Science and Technology Taiwan 106 Taipei

We studied the architecture of embedded computing systems from the viewpoint of power consumption in memory systems and used a selective-code-compression (SCC) approach to realize our *** on the LZW (Lempel-Ziv-Welch) compression algorithm,we propose a novel cost effective compression and decompression *** goal of our study was to develop a new SCC approach with an extended decision policy based on the prediction of power *** decompression method had to be easily implemented in hardware and to collaborate with the embedded *** hardware implementation of our decompression engine uses the TSMC 0.18μm-2p6m model and its cell-based *** calculate power consumption more accurately,we used a static analysis method to estimate the power overhead of the decompression *** also used variable sized branch blocks and considered several features of very long instruction word (VLIW) processors for our compression,including the instruction level parallelism (ILP) technique and the scheduling of *** code-compression methods are not limited to VLIW machines,and can be applied to other kinds of reduced instruction set computer (RISC) architecture.

关键词： LZW compression Cell-based libraries Instruction level parallelism (ILP) VLIW processors

Air bubble breakup in shear water flows generated by a plug conduit:An experimental investigation

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Journal of Hydrodynamics 2023年第6期35卷 1077-1088页

作者： Han Wu Mao-lin Zhou wei-lin Xu Wang-ru wei Jian-bo Li State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China PowerChina Chengdu Engineering Corporation Limited Chengdu610072China

In the context of a sudden contraction plug conduit,the near-wall area experiences a significant shearing effect of water flow,however,the extent to which this shearing effect occurs in bubble-water flow and the related variation mechanisms of air bubble size and number remain *** study employs a model test method to investigate the diffusion process of bubble-water flow in a sudden contraction plug *** size and number of bubbles,as well as their distribution along the shearing section under varying initial air volume conditions,are studied in detail using a high-speed image acquisition *** experimental findings reveal a self-similar relationship between the number and size of bubbles and their cross-sectional distribution over *** bubble number and size vary in three stages,i.e.,quasi-suspension,shearing,and shearing completion *** direction perpendicular to the conduit exhibits peak values in bubble number distribution over the three stages,with peak value location varying with the near-wall *** time progresses,the peak value increases,and a larger initial air volume corresponds to a smaller distance of the peak value location from the *** size of air bubbles near the wall is consistent with the minimum diameter of air bubbles in shear flow and is hardly affected by the initial air *** results aid in comprehending the change law of two-phase water and air flow under a strong shearing effect in the plug conduit,and provide useful insights for hydraulic design in fluid engineering.

关键词： Air-water flows bubble properties air diffusion process plug conduits experimental study

A standard form of incompressible surfaces in 3-dimensional handlebodies

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Science China Mathematics 2023年第10期66卷 2309-2324页

作者： wei lin Fengchun Lei School of Mathematical Sciences Dalian University of TechnologyDalian 116024China

Applying the Morse theory,we give a standard form for a class of surfaces which includes all the properly embedded incompressible surfaces in 3-dimensional *** also give a necessary and sufficient condition to determine the incompressibility of such surfaces placed in our standard *** algorithm is *** examples are given to test the algorithm.

关键词： incompressible surface handlebody Morse theory general position

Single-cell Transcriptome Study as Big Data

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Genomics, Proteomics & Bioinformatics 2016年第1期14卷 21-30页

作者： Pingjian Yu wei lin Genomics and Bioinformatics Lab Baylor Institute for Immunology Research

The rapid growth of single-cell RNA-seq studies （scRNA-seq） demands efficient data storage, processing, and analysis. Big-data technology provides a framework that facilitates the comprehensive discovery of biological signals from inter-institutional scRNA-seq datasets. The strategies to solve the stochastic and heterogeneous single-cell transcriptome signal are discussed in this article. After extensively reviewing the available big-data applications of next-generation sequencing （NGS）-based studies, we propose a workflow that accounts for the unique characteris- tics of scRNA-seq data and primary objectives of single-cell studies.

关键词： Single-cell RNA -seq Big data TranscriptionaSingle-cell heterogenc-ity SignaSingle-cell normaSingle-cellization

Local hydraulic jump effects on sediment deposition in open-channel flume experiments

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Journal of Hydrodynamics 2023年第2期35卷 268-277页

作者： Shi-hao Fu Mao-lin Zhou wei-lin Xu Wang-ru wei Guo-guang Wang State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China

When a river channel is narrow,bifurcated,or intersected,or when extreme weather or geological disasters cause shed rock masses to occupy a river flood channel,local hydraulic jumps may develop in the *** disasters such as landslides,floods,and debris flows occur upstream,will result in large transport rate of large-sized gravel *** particles may be blocked in hydraulic jump areas,causing river channel water depth to *** this study,the effect of local hydraulic jumps on the sediment deposition rate was investigated in flume *** ratio of upstream and downstream Froude numbers,particle size,Sediment supply intensity,and flow discharge all affected the sediment deposition *** increases in the ratio of upstream and downstream Froude numbers,particle size,and sediment supply intensity,the sediment deposition rate *** sediment deposition rate decreased with an increase in flow *** hydraulic conditions and particle properties jointly determined the sediment deposition rate in a hydraulic jump section,and an empirical formula was developed using those parameters to calculate the sediment deposition ***,to identify risks and prevent disasters in mountain rivers,local changes in hydraulic conditions and particle properties need to be jointly evaluated.

关键词： Hydraulic jump sediment deposition particle size upstream/downstream Froude numbers ratio sediment supply intensity flowdischarge