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Particuology 2018年第6期16卷 74-84页

作者： Dechuan Zhang Xiaoshu Cai wu zhou Institute of Particle and Two-Phase Flow Measurement University of Shanghai for Sdence and TechnologyShanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering (University of Shanghai for Sdence and Technology)Shanghai 200093China

In nanoparticle sizing using the ultrafast image-based dynamic light scattering (UIDLS)method,larger impurities and dark noise from the complementary metal-oxide-semiconductor (CMOS)detector affect measurement *** solve this problem,a two-dimensional self-adapting fast Fourier transform (2D-SAFFT)algorithm is proposed for *** light scattering images of nanoparticles are processed using 2D fast Fourier transforms,and a high-frequency threshold and a low-frequency threshold are then set using the self-adapting algorithm to eliminate the effects of the dark noise of the CMOS detector and the *** signals caused by the dark noise of the CMOS detector and the impurities are cut off using the high-frequency threshold and the low-frequency *** signals without the high- and low-frequency components are then processed again using an inverse Fourier transform to obtain new images without the dark noise and impurities *** mean diameters of the measured nanoparticles can be obtained from images obtained using *** standard latex nanoparticles (46,100, 203,508,994nm)and commercial nanoparticles (antimony-doped tin oxide,indium tin oxide,TWEEN- 80,nano-Fe,and nano-Al2O3)were measured using this new *** show that 2D-SAFFT can effectively eliminate the effects of dark noise from the CMOS detector and the impurities.

关键词： Dynamic light scattering Nanoparticle size Fast Fourier transform algorithm Spectrum segmentation

Peridynamic modelling of impact damage in three-point bending beam with offset notch

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Applied Mathematics and Mechanics(English Edition) 2017年第1期38卷 99-110页

作者： Ning LIU Dahsin LIU wu zhou School of Mechanical Engineering Nanjing University of Science and Technology Department of Mechanical Engineering Michigan State University

The nonlocal peridynamic theory has been proven to be a promising method for the material failure and damage analyses in solid mechanics. Based upon the integro- differential equations, peridynamics enables predicting the complex fracture phenomena such as spontaneous crack nucleation and crack branching, curving, and arrest. In this paper, the bond-based peridynamic approach is used to study the impact damage in a beam with an offset notch, which is widely used to investigate the mixed I-II crack propagation in brittle materials. The predictions from the peridynamic analysis agree well with available experimental observations. The numerical results show that the dynamic fracture behaviors of the beam under the impact load, such as crack initiation, curving, and branching, rely on the location of the offset notch and the impact speed of the drop hammer.

关键词： peridynamics impact damage crack propagation fracture mode

Scaling Behaviors of Polymers on Lipid Membranes:Coupling of Polymer Chain Dynamics and Surface Thermal Fluctuations

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Chinese Journal of Polymer Science 2023年第3期41卷 459-464,I0010页

作者： Zi-Ren Chen wu zhou Lei Shen School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China

Despite extensive researches on the motion of polymer chains on lipid membranes,the effect of membrane fluctuations on polymer chain dynamics remains poorly *** we report single molecule tracking experiments that allow for comparable measurements of polymer chain diffusion dynamics on nanotubular and planar phospholipid *** observe a super-diffusion behavior and no apparent chain-length-dependent mobility of polymer chains on nanotubular membranes,while a Brownian motion and apparent chain-lengthdependent mobility of polymer chains on planar *** suggest the super-diffusion nature of polymer chains may be due to the thermal-fluctuations of lipid nanotubes,which can be described from a statistical thermodynamic phenomenon coupling of polymer chain dynamics and surface thermal *** suggest that the existence of surface environment fluctuations should influence the dynamics of the adsorbed polymer *** study provides previously uncharacterized insights into polymer diffusion dynamics on thermal-fluctuating flexible surfaces,which is essential to understanding the effect of environment fluctuations on polymer chain behaviors.

关键词： Polymer diffusion Lipid membrane Scaling behavior

Existence and Uniqueness of Stochastic Differential Equations with Random Impulses and Markovian Switching under Non-Lipschitz Conditions

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Acta Mathematica Sinica,English Series 2011年第3期27卷 519-536页

作者： Shu Jin wu Bin zhou School of Finance and Statistics East China Normal University Shanghai 200241 P. R. China

In the paper, stochastic differential equations with random impulses and Markovian switching are brought forward, where the so-called random impulse means that impulse ranges are driven by a series of random variables and impulse times are a random sequence, so these equations extend stochastic differential equations with jumps and Markovian switching. Then the existence and uniqueness of solutions to such equations are investigated by employing the Bihari inequality under non-Lipschtiz conditions.

关键词： Stochastic differential equation random impulse Markovian switching existence uniqueness non-Lipschtiz condition

Recent progress of computational investigation on anode materials in Li ion batteries

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Frontiers of physics 2011年第2期6卷 197-203页

作者： Di-hua wu Zhen zhou Institute of New Energy Material Chemistry College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry （Ministry of Education） Nankai University Tianjin 300071 China

Computations have been widely used to explore new Li ion battery materials because of its remarkable advantages. In this review, we summarize the recent progress on computational investigation on anode materials in Li ion batteries. By introducing the computational studies on Li storage capability in carbon nanotubes, graphene, alloys and oxides, we reveal that computations have successfully addressed many fundamental problems and are powerful tools to understand and design new anode materials for Li ion batteries.

关键词： Li ion batteries anode carbon nanotubes graphene computation

Fused structures for safer and more economical constructions

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 1-9页

作者： Yu-Fei wu Ying-wu zhou Biao HU Xiaoxu HUANG Scott SMITH School of Engineering RMIT UniversityMelbourneVIC 3001Australia Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering Shenzhen UniversityShenzhen 518061China School of Civil Environmental and Mining EngineeringThe University of AdelaideSouth Australia 5005Australia

Safety margin and construction costs are two conflicting goals for a *** providing a fuse in a structure that is triggered at a certain level of over-loading,further increase of loading is prohibited and failure of the structure is changed to a safer *** overloading is controlled and a safer failure mode is enforced,a fused structure requires a smaller safety factor thus leading to more economical construction without compromising *** use of a fuse will also facilitate safer use of advanced construction materials such as fiber-reinforced polymer(FRP)*** this case,a fuse can transfer the sudden and dangerous failure mode associated with brittle FRP debonding or rupture to a safe and ductile failure mode at the fuse *** paper introduces a new type of fused structure as well as an associated design philosophy and approach,in addition to examples of engineering applications.

关键词： fused structures structural fuse fiber-reinforced polymer concrete

Operando modeling and measurements:Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO_(2)capture in real conditions

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Frontiers in Energy 2023年第3期17卷 380-389页

作者： Tianyi CAI Mengshi WANG Xiaoping CHEN Ye wu Jiliang MA wu zhou School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Key Laboratory of Thermal Control of Electronic Equipment and Advanced Combustion Laboratory of the Ministry of Industry and Information Technology School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Alkalicarbonate-based sorbents(ACSs),including Na_(2)CO_(3)-and K2CO_(3)-based sorbents,are promising for CO_(2)***,the complex sorbent components and operation conditions lead to the versatile kinetics of CO_(2)sorption on these *** paper proposed that operando modeling and measurements are powerful tools to understand the mechanism of sorbents in real operating conditions,facilitating the sorbent development,reactor design,and operation parameter *** reviewed the theoretical simulation achievements during the development of *** elucidated the findings obtained by utilizing density functional theory(DFT)calculations,ab initio molecular dynamics(AIMD)simulations,and classical molecular dynamics(CMD)simulations as *** hygroscopicity of sorbent and the humidity of gas flow are crucial to shifting the carbonation reaction from the gas-solid mode to the gas-liquid mode,boosting the ***,it briefly introduced a machine learning(ML)approach as a promising method to aid sorbent ***,it demonstrated a conceptual compact operando measurement system in order to understand the behavior of ACSs in the real operation *** proposed measurement system includes a micro fluidizedbed(MFB)reactor for kinetic analysis,a multi-camera sub-system for 3D particle movement tracking,and a combined Raman and IR sub-system for solid/gas components and temperature *** is believed that this system is useful to evaluate the real-time sorbent performance,validating the theoretical prediction and promoting the industrial scale-up of ACSs for CO_(2)capture.

关键词： CO_(2)capture carbonation theoretical modeling operando techniques reaction visualization

Isolation and characterization of a sterile-dwarf mutant in Asian cotton (Gossypium arboreum L.)

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Journal of Genetics and Genomics 2009年第6期36卷 343-353页

作者： Chuntai wu Baoliang zhou Tianzhen Zhang National Key Laboratory of Crop Genetics and Germplasm Enhancement Cotton Research Institute Nanjing Agricultural University Nanjing 210095 China

Plant height is an important trait in cotton. To elucidate the molecular mechanisms of the dwarf phenotype, a sterile-dwarf mutant derived from Gossypium arboreum L. cv. Jinhuazhongmian was developed by ^60Co y-ray irradiation. The results demonstrated that the steriledwarf mutant phenotype was controlled by a pair of recessive gene, which was designated sd^a. Plants carrying the sd^a gene contained lower levels of indole-3-acetic acid （IAA） and abscisic acid （ABA） compared with wild-type （WT） plants. The chlorophyll content and net photosynthetic rate in mutant leaves were markedly decreased. However, it was possible that ABA biosynthesis or signaling was involved in governing the sd^a phenotype. Semi-quantitative RT-PCR analysis detected 13 differentially expressed ESTs, and the steriledwarf mutant exhibited decreased expression levels relative to the WT. The role of nine potential hormone biosynthetic genes in the synthesis of IAA, ABA, polyamines （PAs） and jasmonic acid （JA） were discussed.

关键词： Gossypium arboreum sd^a auxin abscisic acid ESTs

FLUID DYNAMIC PERFORMANCE OF GROOVED PLANING BOAT AND ITS EFFECT ON RESISTANCE

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Journal of Hydrodynamics 2005年第5期17卷 571-579页

作者： SHI Zhong-kun wu Fang-liang zhou Feng College of Traffic Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

In this paper, the fluid dynamic performance for a new boat form grooved planing boats is analyzed, and the results of resistance tests for seven grooved planing boat models of different types are presented in the form of curves of attack angle and resistance-weight ratio versus Froude number. According to these curves, the effect of some parameters of the boat type on the resistance is analyzed.

关键词： grooved planing boat fluid dynamic performanee resistanee

Mathematical Model for Growth of Inclusion in Deoxidization on the Basis of Unreacted Core Model

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Journal of Iron and Steel Research International 2008年第6期15卷 24-28页

作者： wu Su zhou ZHANG Jiong-ming Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China

Controlling inclusion composition, from the point of view of thermodynamics, only explains the probability and limit of reaction. However, kinetics makes the nucleation and the velocity of growth of inclusions clear, and these kinetic factors are very important to the quality of slab. The basic kinetic theory of unreacted core model was used to build the mathematical model for the growth of inclusions and the concerned software was developed through Visual Basic 6.0. The time that different radius inclusions attain saturation was calculated to determine the controlling step of reaction between steel and inclusions. The time for the growth of inclusion obtained from the model was in good agreement with the data measured by Japanese Okuyama G, which indicated that the model is reasonable.

关键词： inclusion finite difference method kinetic theory unreacted core model