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View-Aware Image Object Compositing and Synthesis from Multiple Sources

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Journal of Computer Science & Technology 2016年第3期31卷 463-478页

作者： Xiang Chen wei-wei xu Sai-Kit Yeung Kun Zhou State Key Laboratory of Computer Aided Design and Computer Graphics Zhejiang University Hangzhou 310058 China Vision Graphics and Computational Design Group Singapore University of Technology and Design Singapore 487372 Singapore

Image compositing is widely used to combine visual elements from separate source images into a single image. Although recent image compositing techniques are capable of achieving smooth blending of the visual elements from different sources, most of them implicitly assume the source images are taken in the same viewpoint. In this paper, we present an approach to compositing novel image objects from multiple source images which have different viewpoints. Our key idea is to construct 3D proxies for meaningful components of the source image objects, and use these 3D component proxies to warp and seamlessly merge components together in the same viewpoint. To realize this idea, we introduce a coordinate- frame based single-view camera calibration algorithm to handle general types of image objects, a structure-aware cuboid optimization algorithm to get the cuboid proxies for image object components with correct structure relationship, and finally a 3D-proxy transformation guided image warping algorithm to stitch object components. We further describe a novel application based on this compositing approach to automatically synthesize a large number of image objects from a set of exemplars. Experimental results show that our compositing approach can be applied to a variety of image objects, such as chairs, cups, lamps, and robots, and the synthesis application can create novel image objects with significant shape and style variations from a small set of exemplars.

关键词： image cloning 3D proxy probabilistic modeling data-driven method

Invariant Sets and Exact Solutions to Nonlinear Diffusion Equations with x-Dependent Convection and Absorption

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Communications in Theoretical Physics 2008年第10期50卷 821-826页

作者： JIA Hua-Bing xu wei Department of Applied Mathematics Northwestern Polytechnical University Xi＇an 710072 China Department of Matheinatics Baoji University of Arts and Sciences Baoji 721013 China

In this paper, we introduce a new invariant set Eo={u：ux=f＇（x）F（u）＋ε[g＇（x）-f＇（x）g（x）]F（u）×exp（-∫^u1/F（z）dz）}where f and g are some smooth functions of x, ε is a constant, and F is a smooth function to be determined. The invariant sets and exact sohltions to nonlinear diffusion equation ut = （ D（u）ux）x ＋ Q（x, u）ux ＋ P（x, u）, are discussed. It is shown that there exist several classes of solutions to the equation that belong to the invariant set Eo.

关键词： invariant set exact solution nonlinear diffusion equations rotation group scaling group

Glass capillary nanopore for single molecule detection

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Science China(Technological Sciences) 2015年第5期58卷 803-812页

作者： SHA JingJie SI wei xu wei ZOU YiRen CHEN YunFei Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University School of Mechanical Engineering Southeast University

Single molecule detection based on nanopore technology is a very promising approach for medical diagnostics, drug therapy and even DNA sequencing. Compared with other biological nanopores and solid-state nanopores, the glass capillary nanopore has low cost, easy availability and stable mechanical characteristics, thus it has been widely used in the nanopore technology for single molecule detection. In this review, we will focus on the studies of the glass nanopore sensors. The popular glass nanopore fabrication methods would be introduced, and the applications of glass nanopores in the detection of nanoparticles, proteins and DNA molecules would be presented. We hope this review will help widen field of vision and promote the development of the nanopore technology based on the glass capillary nanopores.

关键词： fabrication capillary nanotubes sequencing diameters SWNTs DNA etching diagnostics nanometer

Reaction of Crossed Diperoxidation Between Cyclic Ketones and Alkyl Ketones

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Chemical Research in Chinese Universities 2002年第4期18卷 412-413页

作者： xu wei-liang FU Cheng-ling Organic Chemistry Group Huajiachi SectionZhejiang UniversityHangzhou 310029P.R.China

The reaction of crossed diperoxidation between the cyclic ketones and the alkyl ketones was investigated. The reaction is a competing in different ketones. It is slightly favorable to resulting in crossed ketone diper... 详细信息

关键词： Synthesis Crossed diperoxidation Crossed ketone diperoxide

Modeling of Computational Fluid Dynamics and Experimental Study of Electro-Catalytic Oxidation Enhanced Nanofi ltration for Treating *** Red 73 Wastewater

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Transactions of Tianjin University 2018年第2期24卷 123-130页

作者： Li xu weixin Lu wei xu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin 300350China Tianjin Mainland Hydrogen Equipment Co. LtdTianjin 301609China

C.I. Acid Red 73(AR73)wastewater was treated by cross-flow nanofiltration coupling electro-catalytic oxidation using an NF90 membrane and a Ti/SnO_2–Sb anode prepared via *** conducted for standard electrochemical degradation of AR73 studied the reaction rate ofremoving AR73 using the Ti/SnO _2–Sb anode.A computational fluid dynamics(CFD)model was developed to predict the permeate flux under a laminar flow regime,including the effects ofoperating pressure,applied potential,initial concentration,and cross-flow velocity on this coupling *** variations of the membrane surface concentration and permeate flux along the length of the channel were *** experimental results were compared with those predicted by the model,and they agreed well.

关键词： Electrochemistry Concentration polarization Nanofi ltration Wastewater treatment

Effects of nitrogen deposition on the carbon budget and water stress in Central Asia under climate change

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Journal of Arid Land 2024年第8期16卷 1118-1129页

作者： HAN Qifei xu wei LI Chaofan School of Geographical Sciences Nanjing University of Information Science&TechnologyNanjing 210044China

Atmospheric deposition of nitrogen(N)plays a significant role in shaping the structure and functioning of various terrestrial ecosystems ***,the magnitude of N deposition on grassland ecosystems in Central Asia still remains highly *** this study,a multi-data approach was adopted to analyze the distribution and amplitude of N deposition effects in Central Asia from 1979 to 2014 using a process-based denitrification decomposition(DNDC)*** showed that total vegetation carbon(C)in Central Asia was 0.35(±0.09)Pg C/a and the averaged water stress index(WSI)was 0.20(±0.02)for the whole *** N deposition led to an increase in the vegetation C of 65.56(±83.03)Tg C and slightly decreased water stress in Central *** of this study will expand both our understanding and predictive capacity of C characteristics under future increases in N deposition,and also serve as a valuable reference for decision-making regarding water resources management and climate change mitigation in arid and semi-arid areas globally.

关键词： carbon dynamics climate change grassland ecosystems nitrogen deposition water stress index

A New Method for Estimating Lithium‑Ion Battery State‑of‑Energy Based on Multi‑timescale Filter

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Automotive Innovation 2023年第4期6卷 611-621页

作者： Guangming Zhao wei xu Yifan Wang Road Traffic Safety Research Center of the Ministry of Public Security Beijing 100068China China Automotive Engineering Research Institute Co. LtdChongqing 401120China

Accurate estimation of the state-of-energy(SOE)in lithium-ion batteries is critical for optimal energy management and energy optimization in electric ***,the conventional recursive least squares(RLS)algorithm struggle to track changes in battery model parameters under dynamic *** address this,a multi-timescale estimator is proposed.A variable forgetting factor RLS approach is used to determine the model parameters at a macro timescale,and the H infinity filter is utilized to estimate the SOE at a micro *** proposed algorithm is verified and analyzed and shown to have accurate and robust identification of battery model ***,experiments under dynamic cycles demonstrate that the proposed algorithm has a high level of accuracy for SOE estimation.

关键词： Forgetting factor State-of-energy Multi-timescale Lithium-ion battery

Controlling Single-Photon Transport along an Optical Waveguide by using a Three-Level Atom

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Chinese Physics Letters 2012年第3期29卷 13-16页

作者： TIAN wei CHEN Bin xu wei-Dong Business School University of Shanghai for Science and TechnologyShanghai 200093 Tin Ka-Ping College of Science University of Shanghai for Science and TechnologyShanghai 200093 School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093

We theoretically investigate the single-photon transport properties in an optical waveguide embedded with a V-type three-level atom(VTLA)based on symmetric and asymmetric couplings between the photon and the *** numerical results show that the transmission spectrum of the incident photon can be well controlled by virtue of both symmetric and asymmetric coupling interactions.A multifrequency photon attenuator is realized by controlling the asymmetric coupling ***,the influences of dissipation of the VTLA for the realistic physical system on single-photon transport properties are also analyzed.

关键词： multifrequency waveguide Waveguide

Interactions between water and organic molecules or inorganic salts on surfaces

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Aggregate 2022年第4期3卷 61-72页

作者： Chi Zhang wei xu Interdisciplinary Materials Research Center College of Materials Science and EngineeringTongji UniversityShanghaiPeople’s Republic of China

Water,as a ubiquitous and relatively inert medium,plays a vital role in *** interactions between water and organic molecules or inorganic salts are of fundamental interest in understanding hydration processes in *** combination of scanning probe microscopy and theoretical calculations provides a versatile tool to directly visualize and further rationalize such interactions as well as influences of water on organic molecules and inorganic *** this review,we provide a brief overview of the recent exciting progress in revealing the interactions between water and organic molecules as well as inorganic salts(including ions)on ***,we describe first steps of hydration of organic molecules followed by a microsolvation process on ***,water-induced tautomerization and chiral separation of small biomolecules on surfaces are discussed for understanding the roles of water in driving biological self-assembly ***,water is also able to assist structural transformation globally by selectively interrupting the relatively weak hydrogen bonds within *** on the water-incorporated molecular nanostructures,dissolution of sodium halides on wet surfaces is achievable using confined water,while hydrates of halide ions desorb from the *** interestingly,ion hydrates are also demonstrated to be artificially accessible,which enables atomic-scale investigation into local ion hydration and transport at *** review provides new insights into the role of water in the hydrationrelated molecular and ionic systems,with implications for hydration and solvent effects down to the single-molecule level.

关键词： density functional theory hydration hydrogen bonds scanning probe microscopy water