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In situ investigation of lysozyme adsorption into polyelectrolyte brushes by quartz crystal microbalance with dissipation

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Chinese Journal of Chemical Engineering 2022年第8期35卷 106-115页

作者： Fenfen you Qing-Hong Shi Department of Biochemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjin 300072China

A well understanding about protein adsorption into charged polymer brushes is of importance in the elucidation of mechanism and important phenomena(such as “chain delivery”effect) in protein adsorption on polymer-grafted ion exchange adsorbents. In this work, quartz crystal microbalance with dissipation(QCM-D) was introduced to in situ investigate lysozyme adsorption on QCM sensors grafted with poly(3-sulfopropyl methacrylate)(pSPM) via atom transfer radical polymerization. It was achieved by analyzing frequency(f) and energy dissipation(D) shift simultaneously on pSPM-grafted sensors. The result showed that an initial decrease in ΔD was typical of lysozyme adsorption on pSPM-grafted sensor and more significant with an increase of chain length and grafting density. It was attributed to significant water release in the hydration layer of protein and polymer chains in lysozyme adsorption into pSPM *** pSPM-grafted sensors with long and dense chains, furthermore, lysozyme transitioned from monolayer to multilayer adsorption and the maximum adsorbed amount was obtained to be 374.0 ng·cmamong all pSPM-grafted sensors in this work. The results in D-f plot further revealed that lysozyme adsorption into pSPM brushes increased the rigidity of adsorbed layer and little structure adjustment of adsorbed lysozyme. It was unfavorable for “chain delivery” effect for facilitated transport of adsorbed protein. This work provided valuable insight into protein adsorption in pSPM brushes and outlined a feasible approach to increasing mass transport in polymer-grafted ion exchange adsorbents.

关键词： Adsorption Polymers Protein Water release Graft density Chain length

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A Certain Regular Property of the Method I Construction and Packing Measure

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Acta Mathematica Sinica,English Series 2007年第10期23卷 1769-1776页

作者： Sheng you WEN Department of Mathematics Hubei University Wuhan 430062 P. R. China

Let τ be a premeasure on a complete separable metric space and let τ＊ be the Method I measure constructed from τ. We give conditions on T such that τ＊ has a regularity as follows： Every τ＊-measurable set has measure equivalent to the supremum of premeasures of its compact subsets. Then we prove that the packing measure has this regularity if and only if the corresponding packing premeasure is locally finite.

关键词： method I construction regularity packing premeasure packing measure

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Effect of media heights on the performance of biological aerated filter

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Journal of Environmental Sciences 2005年第2期17卷 281-284页

作者： HUYong-you WANGLi-li SchoolofEnvironmentalScienceandEngineering SouthChinaUniversityofTechnologyGuangzhou510640China DepartmentofEnvironmentalEngineering JinanUniversityGuangzhou510632China

The optimum media height of carbon oxidation and nitrification in a down-flow biological aerated filter was determined, and the distribution of the heterotrophic and nitrifying populations through studying the changes of organic carbon contents and ammonia concentration at different media height was got. The results showed that as a down flow BAF with granular media, the active layer of nitrifiers was deeper than heterotrophs in BAF. And the optimum media height for the removal of SS, COD Cr and NH + 4-N was 40 cm,60 cm and 80 cm respectively. The removal efficiency of SS, COD Cr and NH + 4-N was 79.1%, 63.9% and 96.4% respectively under the influent COD Cr and NH + 4-N of 122.1 mgCOD Cr /L and 14.84 mgNH + 4-N/L, the influent flux of 15.8 L/h, air to liquid ratio of 3∶1.

关键词： biological aerated filter bed material height sewage treatment

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Asymmetric α-Pentadienylation of β-Ketocarbonyls and Aldehydes by Synergistic Pd/Chiral Primary Amine Catalysis

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Chinese Journal of Chemistry 2023年第24期41卷 3533-3538页

作者： Chang you Sanzhong Luo Center of Basic Molecular Science Department of ChemistryTsinghua UniversityBeijing100084 China

Direct alkylation with skipped enynes or cyclopropropylacetylenes represents an ideal process for the installation of pentadienyl group in terms of atom- and *** development of catalytic asymmetric versions has been frequently pursued and most of the successes have been achieved with enolizable *** herein describe a synergistic chiral primary amine/Pd catalysis for asymmetric α-pentadienylation of β-ketocarbonyls and aldehydes with skipped enynes or *** reaction features the construction of acyclic all-carbon quaternary centers with high enantioselectivity,and good functional group tolerance and scalability.

关键词： α-Pentadienylation Synergistic catalysis Chiral primary amine Pd catalysis Hydrocarbons

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Machine Learning and Data-Driven Techniques for the Control of Smart Power Generation Systems:An Uncertainty Handling Perspective

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Engineering 2021年第9期7卷 1239-1247页

作者： Li Sun Fengqi you Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and the EnvironmentSoutheast UniversityNanjing 210096China Robert Frederick Smith School of Chemical and Biomolecular Engineering Cornell UniversityIthacaNY 14853USA

Due to growing concerns regarding climate change and environmental protection,smart power generation has become essential for the economical and safe operation of both conventional thermal power plants and sustainable *** first-principle model-based methods are becoming insufficient when faced with the ever-growing system scale and its various *** burgeoning era of machine learning(ML)and data-driven control(DDC)techniques promises an improved alternative to these outdated *** paper reviews typical applications of ML and DDC at the level of monitoring,control,optimization,and fault detection of power generation systems,with a particular focus on uncovering how these methods can function in evaluating,counteracting,or withstanding the effects of the associated uncertainties.A holistic view is provided on the control techniques of smart power generation,from the regulation level to the planning *** benefits of ML and DDC techniques are accordingly interpreted in terms of visibility,maneuverability,flexibility,profitability,and safety(abbreviated as the“5-TYs”),***,an outlook on future research and applications is presented.

关键词： Smart power generation Machine learning Data-driven control Systems engineering

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Large coupling asymptotics for the entropy of quasi-periodic operators

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Science China Mathematics 2020年第9期63卷 1745-1756页

作者： Lingrui Ge Jiangong you Department of Mathematics University of California at IrvineIrvineCA 92612USA Chern Institute of Mathematics and LPMC Nankai UniversityTianjin 300071China

In this paper,we give an asymptotic estimate for the entropy,i.e.,the sum of all positive Lyapunov exponents,of the quasi-periodic nite-range operator with a large trigonometric polynomial potential and Diophantine fr... 详细信息

关键词： large coupling asymptotics entropy quasi-periodic operator quantitative almost reducibility

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MIXED FINITE ELEMENT METHODS FOR ***-STOKES EQUATIONS

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Journal of Computational Mathematics 2021年第1期39卷 130-146页

作者： Xiaocui Li Xu you College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China Department of Mathematics and Physics Beijing Institute of Petrochemical TechnologyBeijing 102617China

This paper gives the detailed numerical analysis of mixed finite element method for fractional Navier-Stokes *** proposed method is based on the mixed finite element method in space and a finite difference scheme in *** stability analyses of semi-discretization scheme and fully discrete scheme are discussed in ***,We give the convergence analysis for both semidiscrete and flly discrete schemes and then prove that the numerical solution converges the exact one with order O(h2+k),where h and k:respectively denote the space step size and the time step ***,numerical examples are presented to demonstrate the effectiveness of our numerical methods.

关键词： Time-fractional Navier-Stokes equations,Finite element method,Error esti-mates Strong convergence.

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Transition from Disorder to Order in Traffic Flow

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Chinese Physics Letters 2004年第7期21卷 1212-1215页

作者： LIKe-Ping GAOZi-you SchoolofTrafficandTransportation BeijingJiaotongUniversityBeijing100044

We propose a new technique to investigate the dynamical transitions among the traffic phases. A type of the control signals has been designated at a given site (signal point) of the single-lane highway. Under the effect of the control signal, the velocity of the vehicle that passes the signal point will be changed periodically. Our method is tested for the deterministic NaSch traffic model. The simulation results demonstrate that the disorder states in the deterministic NaSch traffic model can be suppressed, and the different types of periodic states would occur.

关键词： Environmental and Earth science Statistical physics and nonlinear systems

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Global regularity for a class of Monge-Ampère type equations

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Science China Mathematics 2022年第3期65卷 501-516页

作者： Mengni Li you Li Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China Yau Mathematical Sciences Center Tsinghua UniversityBeijing 100084China

In this paper we are concerned with the global regularity of solutions to the Dirichlet problem for a class of Monge-Ampère type *** employing the concept of(a,η) type domain,we emphasize that the boundary regularity depends on the convexity of the domain in *** key idea of our proof is to provide more effective global H?lder estimates of convex solutions to the problem based on carefully choosing auxiliary functions and constructing sub-solutions.

关键词： Dirichlet problem Monge-Ampère type equation H?lder estimate

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A quality status encoding scheme for PCB-based products in IoT-enabled remanufacturing

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Frontiers of Computer Science 2021年第5期15卷 173-186页

作者： Sijie LI you SHANG School of Economics and Management Southeast UniversityNanjing 211189China

In this paper,a binary-extensible quality status encoding scheme,named IQSCT(IoT quality status code table),is proposed for the PCB-based product with available recovery options in *** is achieved by code evolution based on binary logic,in which the product flow and the quality information flow are integrated,and three key features of PCB-based product(PCB-module association,assembly-disassembly logic,and disassembly risk)are involved in production *** IQSCT,the manufacturer can have better decisions to reduce remanufacturing cost and improve resource utilization,which is verified by a case study based on the real data from BOM cost and corresponding estimation of Apple iPhone 11 series.

关键词： Intemet-of-Things binary encoding scheme binary logic bit operations PCB-based products remanufacturing recovery option

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