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Durable and recyclable BiOBr/silk fibroin-cellulose acetate composite film for efficient photodegradation of dyes under visible light irradiation

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1765-1775页

作者： Jialiang Xu Jian Jian Yixiao Dan Jie Song Lingxi Meng Pei Deng Weijie Sun Yusheng Zhang Jinhua Xiong zhengqiu Yuan Hu Zhou School of Chemistry and Chemical Engineering Hunan Engineering Research Center for Functional Film MaterialsHunan University of Science and TechnologyXiangtan 411201China School of Chemical Engineering Post Doctoral Mobile Station in ChemistryXiangtan UniversityXiangtan 411105China Post Doctoral Research Workstation Anhui Huaxing Chemical Industry Co.Ltd.Hexian 238251China

A stable and recyclable of BiOBr/silk fibroincellulose acetate composite film was prepared by blendingwet phase transformation and in situ precipitate *** cellulose acetate film modified by silk fibroin formed a finger-shaped porous structure,which provided a large space for the uniform growth of BiOBr nanosheets and facilitated the shuttle flow of dyes in *** morphology,phase structure,and optical properties of the composite films were characterized using various techniques,and their photocatalytic performance for dye wastewater was evaluated under visible light *** showed that the BiOBr/SF-CA composite film exhibited efficient photocatalytic activity with 99.9%of rhodamine B degradation ***,the composite film maintained high catalytic stability because Bi as the active species deposited on the film showed almost no ***,the possible photocatalytic mechanisms in the BiOBr/SF-CA composite film were speculated through radical-trapping experiments and electron spin resonance testing.

关键词： BiOBr nanosheet cellulose acetate silk fibroin photocatalytic degradation dye wastewater

Understanding of performance degradation of LiNi0.80Co0.10Mn0.10O2 cathode material operating at high potentials

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Journal of Energy Chemistry 2020年第2期29卷 135-141页

作者： sheng SZhang Electrochemistry Branch FCDD-RLS-DCSensors and Electron Devices DirectorateU.S.Army Research LaboratoryAdelphiMD 20783-1138USA

Inferior cycling stability, poor safety, and gas generation are long lasting problems of Ni-rich Li Ni0.80 Co0.10 Mn0.10 O2(NCM811) cathode material. Although much effort has been made, mechanisms for the above problems are poorly understood. Studying the cycling and float-charging characteristics of Li/NCM811 cells in high voltage conditions(4.5 V and 4.7 V, respectively), in this work we find that nearly all known problems with NCM811 material can be attributed to the oxidation of lattice oxygen occurring in the capacity region corresponding to H2 → H3 phase transition. While contributing to overall capacity,the oxidation of lattice oxygen results in a loss of oxygen through oxygen evolution and relative reactions between active oxygen evolution intermediates and electrolyte solvents. It is the loss of oxygen that results in irreversible layered-spinel-rocksalt phase transition, secondary particle cracking, and performance degradation. The conclusions of this work suggest that the priority for further research on NCM811 material should give to the suppression of oxygen evolution, followed by the use of the anti-oxygen electrolyte being chemically stable against the active oxygen evolution intermediates.

关键词： Ni-rich cathode Lattice oxygen Phase transition Oxygen evolution Performance degradation

ON APPROXIMATION BY REPRODUCING KERNEL SPACES IN WEIGHTED L^p SPACES

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Journal of Systems Science & Complexity 2007年第4期20卷 623-638页

作者： Baohuai sheng Department of Mathematics Shaoxing College of Arts and Sciences Shaoxing 312000 China

In this paper, we investigate the order of approximation by reproducing kernel spaces on （-1, 1） in weighted L^p spaces. We first restate the translation network from the view of reproducing kernel spaces and then construct a sequence of approximating operators with the help of Jacobi orthogonal polynomials, with which we establish a kind of Jackson inequality to describe the error estimate. Finally, The results are used to discuss an approximation problem arising from learning theory.

关键词： Approximation reproducing kernel spaces weighted LW^p spaces.

Low-energy atomic displacement model of SRIM simulations

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Nuclear Science and Techniques 2021年第11期32卷 15-24页

作者： sheng-Li Chen Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

Radiation-induced atomic displacement damage is a pressing issue for *** present work investigates the number of atomic displacements using the Primary Knock-on Atom (PKA) energy E_(PKA)and threshold displacement energy E_(d)as two major parameters via lowenergy SRIM Binary Collision Approximation (BCA) full cascade *** is found that the number of atomic displacements cannot be uniquely determined by E_(PKA)/E_(d )or E_(D) /E_(d)(E_(D) refers to the damage energy) when the energy is comparable with E_(d).The effective energy E_(D,eff)proposed in the present work allows to describing the number of atomic displacements for most presently studied monatomic materials by the unique variable E_(D,eff)/E_(d).Nevertheless,it is noteworthy that the BCA simulation damage energy depends on E_(d),whereas the currently used analytical method is independent of E_(d).A more accurate analytical damage energy function should be determined by including the dependence on E_(d).

关键词： Atomic displacement Damage energy Effective energy SRIM neutron cascade simulations

Global Well-posedness for the 2D Micropolar Rayleigh–Bénard Convection Problem without Velocity Dissipation

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Acta Mathematica Sinica,English Series 2021年第7期37卷 1053-1065页

作者： sheng WANG Shanghai Center for Mathematical Sciences Fudan UniversityShanghai 200433P.R.China

In this article,we study the Cauchy problem to the micropolar Rayleigh–Bénard convection problem without velocity dissipation in two *** first prove the local well-posedness of a smooth solution,and then establish a blow up criterion in terms of the gradient of scalar temperature *** last,we obtain the global well-posedness to the system.

关键词： 2D micropolar Rayleigh–Bénard convection problem blow-up criterion smooth solution global well-posedness

Probabilistic direct counterfactual quantum communication

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Chinese Physics B 2017年第2期26卷 68-74页

作者： sheng Zhang Department of Electronic Technology China Maritime Police Academy Ningbo 315801 China

It is striking that the quantum Zeno effect can be used to launch a direct counterfactual communication between two spatially separated parties, Alice and Bob. So far, existing protocols of this type only provide a deterministic counterfactual communication service. However, this counterfactuality should be payed at a price. Firstly, the transmission time is much longer than a classical transmission costs. Secondly, the chained-cycle structure makes them more sensitive to channel noises. Here, we extend the idea of counterfactual communication, and present a probabilistic-counterfactual quantum communication protocol, which is proved to have advantages over the deterministic ones. Moreover, the presented protocol could evolve to a deterministic one solely by adjusting the parameters of the beam splitters.

关键词： quantum communication quantum cryptography optical implementation of quantum information processing

Artificial intelligence in radiotherapy:a technological review

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Frontiers of Medicine 2020年第4期14卷 431-449页

作者： Ke sheng Department of Radiation Oncology University of CaliforniaLos AngelesCA 90095USA

Radiation therapy(RT)is widely used to treat *** advances in RT have occurred in the past 30 *** advances,such as three-dimensional image guidance,intensity modulation,and robotics,created challenges and opportunities for the next breakthrough,in which artificial intelligence(AI)will possibly play important *** will replace certain repetitive and labor-intensive tasks and improve the accuracy and consistency of others,particularly those with increased complexity because of technological *** improvement in efficiency and consistency is important to manage the increasing cancer patient burden to the ***,AI may provide new functionalities that facilitate satisfactory *** functionalities include superior images for real-time intervention and adaptive and personalized *** may effectively synthesize and analyze big data for such *** review describes the RT workflow and identifies areas,including imaging,treatment planning,quality assurance,and outcome prediction,that benefit from *** review primarily focuses on deep-learning techniques,although conventional machine-learning techniques are also mentioned.

关键词： artificial intelligence radiation therapy medical imaging treatment planning quality assurance outcome prediction

Laser irradiation constructing all-in-one defective graphenepolyimide separator for effective restraint of lithium dendrites and shuttle effect

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Nano Research 2023年第10期16卷 12304-12314页

作者： Jiawei Mu Mengdi Zhang Yanan Li Zhiliang Dong Yuanyuan Pan Bei Chen zhengqiu He Haiqiu Fang Shuoshuo Kong Xin Gu Han Hu Mingbo Wu State Key Laboratory of Heavy Oil Processing Advanced Chemical Engineering and Energy Materials Research CenterCollege of New EnergyChina University of Petroleum(East China)Qingdao 266580China College of Physics University-Industry Joint Center for Ocean Observation and Broadband CommunicationState Key Laboratory of Bio-Fibers and Eco TextilesQingdao UniversityQingdao 266071China

The commercialization of lithium-sulfur(Li-S)batteries faces several bottlenecks,and the major two of which are the shuttle effect of polysulfides and the wild growth of Li dendrites,responsible for fast capacity decay and severe safety *** an essential component of Li-S batteries,the structure and properties of the separators are closely related to the above problems,and the exploration of multifunctional separators is highly ***,an integrated separator composited of defective graphene and polyimide(DG-PI)was innovatively fabricated by electrospinning combined with the laser-induced carbonization *** all-in-one compact architecture with well-interconnected channels shows superior mechanical and thermal stability and *** importantly,the PI nanofibers containing N–/O–functional groups can induce the uniform deposition of lithium on the anode surface,while the DG framework with abundant pentagonal/heptagonal rings and vacancies can strongly trap polysulfides and accelerate polysulfide transformation on the cathode *** strong chemical interaction between the insulative PI layer and the conductive DG layer modulates the surface charge distribution of each other,leading to more prominent contributions to restraining lithium dendrites and shuttle ***,the Li-S batteries based on the integrated DG-PI separators afford an excellent performance in protecting lithium anode(stable cycles of 200 h at 5 mA·cm^(−2))and good cycling stability with a low capacity decay of 0.05%per cycle after 700 cycles at 1 *** work offers a new design concept of multifunctional Li-S battery separators and broadens the application scope of laser micro-nano fabrication technology.

关键词： lithium-sulfur batteries separators laser-induced graphene intrinsic carbon defects shuttle effect Li dendrites

Numerical modeling of solute transport in deformable unsaturated layered soil

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Water Science and Engineering 2017年第3期10卷 184-196页

作者： sheng Wu Dong-sheng Jeng Cities Research Institute Griffith School of EngineeringGriffith UniversitySouthport 4222Australia

The effect of soil stratification was studied through numerical investigation based on the coupled model of solute transport in deformable unsaturated soil. The theoretical model implied two-way coupled excess pore pressure and soil deformation based on Biot's consolidation theory as well as a one-way coupled volatile pollutant concentration field developed from the advection-diffusion theory. Embedded in the model, the degree of saturation, fluid compressibility, self-weight of the soil matrix, porosity variance, longitudinal dispersion, and linear sorption were computed. Based on simulation results of a proposed three-layer landfill model using the finite element method, the multi-layer effects are discussed with regard to the hydraulic conductivity, shear modulus, degree of saturation, molecular diffusion coefficient, and thickness of each layer. Generally speaking, contaminants spread faster in a stratified field with a soft and highly permeable top layer; soil parameters of the top layer are more critical than the lower layers but controlling soil thicknesses will alter the results. This numerical investigation showed noticeable impacts of stratified soil properties on solute migration results, demonstrating the importance of correctly modeling layered soil instead of simply assuming the averaged properties across the soil profile.

关键词： Solute transport Layered soil Consolidation Unsaturated soil Deformable media