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The Anion Binding Affinity Determines the Strength of Anion Specificities of Thermosensitive Polymers

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Chinese Journal of Polymer Science 2021年第11期39卷 1351-1356页

作者： lei-lei Lian Si-yuan Xu Hai-y.ng yuan Guang-Ming Liu Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China

In this work,we demonstrate that the strength of anion specificities of thermosensitive polymers is determined by the affinity of direct anion binding to the *** have prepared a series of thermosensitive statistical copolymers with distinct thermoresponsive *** anions can specifically interact with the different types of thermosensitive polymers in very different strengths.A similar strength of specific anion effects on thermoresponsive behaviors can be observed at very different salt concentrations for the different types of thermosensitive polymers.A stronger anion binding to the thermosensitive polymers gives rise to a more obvious anion specificity and vice *** work presented here opens up opportunities for the application of ion binding affinity to modulate the strength of ion specificities of thermosensitive polymers.

关键词： Specific ion effect Polyzwitterion Ion-polymer interaction Thermosensitivity Ion-pairing

Efficacy of Bunao Fuyuan decoction on cerebral ischemia and reperfusion injury in vitro

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Journal of Traditional Chinese Medicine 2020年第5期40卷 758-765页

作者： Gao lei Gu Weichao Department of Rehabilitation Medicine Huai'an Traditional Chinese Medicine Hospital Affiliated to Nanjing University of Chinese MedicineHuaian 223001China Department of Traditional Chinese Medicine The Affiliated Huai'an Hospital of Xuzhou Medical University and The Second People's Hospital of Huai'anHuaian 223002China

OBJECTIVE:To investigate the protective efficacy of Bunao Fuyuan decoction(BNFy)on cerebral Ischemia/reperfusion(I/R)***:The mouse PC12 cells were chosen,and the oxidative-glucose deprivation/re-oxygenation(OGD/R)injury model were established to simulate cerebral I/R *** was selected as a positive drug,and a gradient dose of BNFy was given for 6,12 and 24 h.3-(4,5)-dimethylthiahiazo(-z-y1)-3,5-di-phenytetrazoliumromide(MTT)assay were used to detect cell viability at each time *** apoptosis was measured by terminal deoxynucleotidyl transferase-mediated d UTP-botin nick end labeling(TUNEL)*** linked immunosorbent assay was used to detect the expression of tumor necrosis factor(TNF)-α,interleukin(IL)-6,IL-1βand platelet activating factor(PAF).Western blot assay were performed to detect the expression of key regulators[toll-like receptor 4(TLR4),nuclear factor kappa-B(NF-κB),p-p38 mito-gen-activated protein kinase(MAPK)and p-Akt(also known as protein kinase B,PKB)]of cell survival and inflammatory ***:The results of MTT assay and TUNEL staining assay revealed that BNFy significantly increased cell viability and inhibited cell apoptosis of PC12 cells following OGD/R,***,the expression of TNF-α,1 L-6,1 L-1βand PAF were decreased after BNFy *** the results of Western blot assay showed that BNFy downregulated TLR4,NF-κB,p-p38 MAPK expression and upregulated p-Akt ***:Our findings suggest that BNFy may play a role in protecting OGD/R injured PC12 cells through inhibiting the inflammatory response and cell apoptosis.

关键词： Inflammatory response Ischemic stroke PC12 Oxidative-glucose deprivation/re-oxygenation Bunao Fuyuan decoction

Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass

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Light(Science & Applications) 2020年第1期9卷 1860-1869页

作者： Masaaki Sakakura yuhao lei lei Wang yan-Hao yu Peter G.Kazansky Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK

Polarization and geometric phase shaping via a space-variant anisotropy has attracted considerable interest for fabrication of flat optical elements and generation of vector beams with applications in various areas of science and *** the methods for anisotropy patterning,imprinting of self-assembled nanograting structures in silica glass by femtosecond laser writing is promising for the fabrication of space-variant birefringent optics with high thermal and chemical durability and high optical damage ***,a drawback is the optical loss due to the light scattering by nanograting structures,which has limited the ***,we report a new type of ultrafast laser-induced modification in silica glass,which consists of randomly distributed nanopores elongated in the direction perpendicular to the polarization,providing controllable birefringent structures with transmittance as high as 99% in the visible and near-infrared ranges and >90% in the UV range down to 330 *** observed anisotropic nanoporous silica structures are fundamentally different from the femtosecond laser-induced nanogratings and conventional nanoporous silica.A mechanism of nanocavitation via interstitial oxygen generation mediated by multiphoton and avanlanche defect ionization is *** demonstrate ultralow-loss geometrical phase optical elements,including geometrical phase prism and lens,and a vector beam convertor in silica glass.

关键词： polarization silica phase

LiFePO_(4)and LiMn_(2)O_(4)nanocomposite coating of LiNi_(0.815)Co_(0.15)Al_(0.035)O_(2)cathode material for high-performance lithium-ion battery

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Rare Metals 2022年第8期41卷 2560-2566页

作者： Zi-Wei Lan Jian-Ru Zhang yuan-yuan Li Ru-Heng Xi y.ng-Xiang yuan lei Zhao Xiao-yi Hou Jia-Tai Wang Dickon H.L.ng Cai-Hong Zhang College of Physics and Electronic Information Engineering Qinghai Normal UniversityXining810008China Department of Physical Science and Technology Lingnan Normal UniversityZhanjiang524048China Department of Physics The Chinese University of Hong KongHong Kong999077China

To solve the multiple problems of low ionic conductivity,fast capacity decay,and poor cycling performance of Nirich layered cathode materials,LiNi_(0.815)Co_(0.15)Al_(0.035)O_(2)@LiFePO_(4)@LiMn_(2)O_(4)(NCA@LFP@LMO,abbreviated as AFM)series cathode materials with different coating ratios were synthesized by a two-step ball milling method and precise control of the mass coating ratio of LFP and *** cathode material of NCA,LFP and LMO with a mass ratio of 8:1:1(A_(8)F_(1)M_(1))presents a more desirable nanocomposite coating and still can deliver a discharge capacity of 151.67 mAh·g^(-1)(with a 94.52%capacity retention)after 200 cycles at 1.0 ***.

关键词： coating cycling performance

Dynamical models for secular evolution of navigation satellites

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Astrodynamics 2020年第1期4卷 57-73页

作者： Hanlun lei School of Astronomy and Space Science Nanjing UniversityNanjing210046China

In this work,two dynamical models are formulated to describe the secular dynamics of navigation satellites moving in the medium Earth orbit(MEO)and geosynchronous orbit(GSO)*** the dynamical models,the leading terms of the Earth’s oblateness and the luni-solar gravitational perturbations are *** convenience,the orbits of the Sun and the Moon are described in the geocentric ecliptic reference frame,where the regression of nodal line and precession of apsidal line of the lunar orbit can be approximated as linear functions of *** disturbing function acting on navigation satellites is analytically averaged over the mean motions of both the satellite and the third body(the Sun or the Moon).Explicit expressions of the averaged disturbing function are provided in the geocentric ecliptic and equatorial reference frames,corresponding to averaged model 1 and averaged model 2,*** is found that there are seven resonant arguments in averaged model 1,while there are thirty-two resonant arguments in averaged model *** associated resonance curves corresponding to these resonant arguments in each model form the dynamical backbone in the phase space,organizing secular behavior of navigation *** last,the averaged models are numerically compared to the associated non-averaged model,and simulation results indicate that(a)the averaged models formulated in the geocentric ecliptic and equatorial reference frames are identical,and(b)both of these two averaged models are applicable in predicting secular behavior of navigation satellites.

关键词： navigation satellites disturbing function secular resonances double-averaging approach

A Tauberian theorem for l-adic sheaves on A^1

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Science China Mathematics 2010年第9期53卷 2207-2214页

作者： Fu lei Nankai Univ Chern Inst Math Tianjin 300071 Peoples R China Nankai Univ LPMC Tianjin 300071 Peoples R China

Let K ∈ L1(R) and let f ∈ L∞(R) be two functions on *** convolution(Kf)(x) =∫R K(x-y)f(y)dy can be considered as an average of f with weight defined by ***'s Tauberian theorem says that under suitable conditions,if lim x→∞(K f)(x) = lim x→∞(K A)(x) for some constant A,then lim x→∞ f(x) = *** prove the following-adic analogue of this theorem:Suppose K,F,G are perverse-adic sheaves on the affine line A over an algebraically closed field of characteristic p(p=l).Under suitable conditions,if(K F)|η∞≌(K G)|η∞,then F|η∞≌ G|η∞,where η∞ is the spectrum of the local field of A at ∞.

关键词： Tauberian theorem l-adic Fourier transformation local Fourier transformation

A review of the strengthening–toughening behavior and mechanisms of advanced structural materials by multifield coupling treatment

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 185-199页

作者： Xiu Song lei Wang y.ng Liu The Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

The application of an external field is a promising method to control the microstructure of materials, leading to their improved performance. In the present paper, the strengthening and toughening behavior of some typical high-performance structural materials subjected to multifield coupling treatment, including electrostatic field, electro-pulse current, thermal field, and stress field, are reviewed in detail. In addition to the general observation that the plasticity of materials could be increased by multi-external fields, strength enhancement can be achieved by controlling atomic diffusion or phase transformations. The paper is not limited to the strengthening and toughening mechanisms of the multifield coupling effects on different types of structural materials but is intended to provide a generic method to improve both the strength and ductility of the materials. Finally, the prospects of the applications of multi-external fields have also been proposed based on current works.

关键词： multifield coupling structural materials strengthening toughening microstructure

SDS-modified Nanoporous Silver as an Efficient Electrocatalyst for Selectively Converting CO2 to CO in Aqueous Solution

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Chinese Journal of Chemistry 2019年第4期37卷 337-341页

作者： lei Shi yuning Zhang Xiaofei Han Dongfang Niu Jinlong Sun Jenny y.y.ng Shuozhen Hu Xinsheng Zhang State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Department of Chemistry University of CaliforniaIrvineCalifornia 92697United States

Selectively electrochemical conversion of CO2 into organic fuel using renewable electricity is one of the most sought-after *** this paper,we report the electrochemical reduction of CO2(CO2RR)on the nanoporous Ag electrodes made of compacted Ag nanoparticles(AgNPs),which were prepared by one-step reduction in the water phase with or without the surfactant sodium dodecyl sulfate(SDS).The scanning electron microscope(SEM)characterizations show that the compacted Ag electrodes have the nanoporous morphology formed by stacking *** with the nanoporous Ag electrode without SDS modification(C-AgNPs),the SDS-modified AgNPs electrode(C-AgNPs-SDS)is highly effective in improving selective CO production in a wide range of potentials(-0.69 V--1.19 V,***),with a Faradaic efficiency of 92.2% and a current density of -8.23 mA·cm^-2 for CO production at -0.79 V(***).C-AgNPs-SDS is also catalytically stable with only less than 7% deactivation after 8 h of continuous electrolysis.

关键词： CO2 CO Aqueous Solution

Pre-Training Physics-Informed Neural Network with Mixed Sampling and Its Application in High-Dimensional Systems

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Journal of Systems Science & Complexity 2024年第2期37卷 494-510页

作者： LIU Haiyi ZHAng yabin WAng lei School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China School of Control and Computer Engineering North China Electric Power UniversityBeijing 102206China

Recently,the physics-informed neural network shows remarkable ability in the context of solving the low-dimensional nonlinear partial differential ***,for some cases of high-dimensional systems,such technique may be time-consuming and *** this paper,the authors put forward a pre-training physics-informed neural network with mixed sampling(pPINN)to address these *** based on the initial and boundary conditions,the authors design the pre-training stage to filter out the set of the misfitting points,which is regarded as part of the training points in the next *** authors further take the parameters of the neural network in Stage 1 as the initialization in Stage *** advantage of the proposed approach is that it takes less time to transfer the valuable information from the first stage to the second one to improve the calculation accuracy,especially for the high-dimensional *** verify the performance of the pPINN algorithm,the authors first focus on the growing-and-decay.ng mode of line rogue wave in the Davey-Stewartson I *** case is the accelerated motion of lump in the inhomogeneous Kadomtsev-Petviashvili equation,which admits a more complex evolution than the uniform *** exact solution provides a perfect sample for data experiments,and can also be used as a reference frame to identify the performance of the *** experiments confirm that the pPINN algorithm can improve the prediction accuracy and training efficiency well,and reduce the training time to a large extent for simulating nonlinear waves of high-dimensional equations.

关键词： High-dimensional systems mixed sampling nonlinear wave pre-training physics-informed neural network