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Nano Research 2025年第1期18卷 195-207页

作者： chun zhu Yifei Yang Yike Jing Zhen Zeng Xuesong Yi Wei Sun Fei Yang Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province School of Environmental Science and EngineeringHainan UniversityHaikou 570228China

Electrochemical nitrate reduction reaction(NO3RR)to ammonia is a promising approach to address excess Ncontamination in aqueous environment but suffers from a limited ammonia yield and selectivity due to the low concentration and sluggish *** work reports a three-dimensional porous electrode with binary Co_(2)Cu_(1)hydroxy phosphate embedded into the surface of Ni_(3)Co_(1)oxy/hydroxides(CoCu-PH@NiCo/Ni,“PH”means phosphate-hydroxide),which delivers a yield of 4.13 mg·h^(-1)·cm^(-2)with a high Faraday efficiency of 92.6%under a low nitrate concentration of 40 mM and provide an impressive *** embedded structure of the as-prepared catalyst exhibits unique metal coordination ligands and valence states different from the unitary *** electrochemical in situ infrared spectra and theoretical calculations revealed that the Co sites with the ability to dissociate water molecular to form adsorbed OH*can effectively provide the required protons for the deoxygenation and hydrogenation steps during NO3-conversion,thereby,effectively reducing the energy barrier of the key transition states in the NO3RR process to improve the intrinsic *** demonstrate that the rational design of binary components with the appropriate ability to activate water molecules as well as the threedimensional porous skeletal structure are expected to promote effectively the low-concentration nitrates conversion to ammonia.

关键词： nitrate reduction hydroxy phosphate surface embedded water dissociation active hydroxy adsorbed

Toward an in-depth evaluation of the ecosystem component of CMIP6 Earth system models

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Advances in Climate Change Research 2021年第4期12卷 581-583页

作者： zhu Zai-chun School of Urban Planning and Design Peking University Shenzhen Graduate SchoolPeking UniversityShenzhen518055China

Reliable future climate projection is essential to provide the scientific basis for climate mitigation and adaptation *** Earth system model(ESM)is an important tool for future climate projection,as it provides future climate projections under various scenarios and inferences of potential solutions to climate mitigation and ***,projecting future climate using ESMs has proven challenging because these models consist of highly complex coupled components that simulate the Earth system's physical,chemical,and biological *** to previous Coupled Model Intercom-parison Project(CMIP)phases,the sixth phase of the CMIP(CMIP6)now includes more improved *** improve-ments in the spatial resolution,parameterization,and repre-sentation of processes of these latest-generation ESMs provide opportunities to advance our understanding of the Earth sys-tem but are also likely to increase the spread of the simulations across ESMs(Pascoe et al.,2019).Comparison of model simulations against observations is essential for improving confidence in their utility for climate projections and attribu-tion studies and for identifying deficiencies in models such that the parameterization and representation of processes can be further improved.

关键词： Earth CMIP system

Visual interpretability for deep learning：a survey

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Frontiers of Information Technology & Electronic Engineering 2018年第1期19卷 27-39页

作者： Quan-shi ZHANG Song-chun zhu University of California Los Angeles California 90095 USA

This paper reviews recent studies in understanding neural-network representations and learning neural networks with interpretable/disentangled middle-layer *** deep neural networks have exhibited superior performance in various tasks,interpretability is always Achilles' heel of deep neural *** present,deep neural networks obtain high discrimination power at the cost of a low interpretability of their black-box *** believe that high model interpretability may help people break several bottlenecks of deep learning,e.g.,learning from a few annotations,learning via human–computer communications at the semantic level,and semantically debugging network *** focus on convolutional neural networks(CNNs),and revisit the visualization of CNN representations,methods of diagnosing representations of pre-trained CNNs,approaches for disentangling pre-trained CNN representations,learning of CNNs with disentangled representations,and middle-to-end learning based on model ***,we discuss prospective trends in explainable artificial intelligence.

关键词： Artificial intelligence Deep learning Interpretable model

The classification of bi-quintic parametric polynomial minimal surfaces

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Applied Mathematics(A Journal of Chinese Universities) 2017年第1期32卷 14-26页

作者： LI Cai-yun zhu chun-gang School of Mathematics and Physics Science Dalian University of Technology Panjin 124221 China School of Mathematical Sciences Dalian University of Technology Dalian 116024 China

Parametric polynomial surface is a fundamental element in CAD systems. Since the most of the classic minimal surfaces are represented by non-parametric polynomial, it is interesting to study the minimal surfaces represented in parametric polynomial form. Recently,Ganchev presented the canonical principal parameters for minimal surfaces. The normal curvature of a minimal surface expressed in these parameters determines completely the surface up to a position in the space. Based on this result, in this paper, we study the bi-quintic isothermal minimal surfaces. According to the condition that any minimal isothermal surface is harmonic,we can acquire the relationship of some control points must satisfy. Follow up, we obtain two holomorphic functions f（z） and g（z） which give the Weierstrass representation of the minimal surface. Under the constrains that the minimal surface is bi-quintic, f（z） and g（z） can be divided into two cases. One case is that f（z） is a constant and g（z） is a quadratic polynomial, and another case is that the degree of f（z） and g（z） are 2 and 1 respectively. For these two cases,we transfer the isothermal parameter to canonical principal parameter, and then compute their normal curvatures and analyze the properties of the corresponding minimal surfaces. Moreover,we study some geometric properties of the bi-quintic harmonic surfaces based on the B′ezier representation. Finally, some numerical examples are demonstrated to verify our results.

关键词： polynomial parametric curvature canonical compute quadratic satisfy isothermal acquire verify

Classification and Reduction of Generalized Thin Film Equations

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Communications in Theoretical Physics 2009年第9期52卷 403-410页

作者： zhu chun-Rong QU Chang-Zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China College of Mathematics and Computer Science Anhui Normal University Wuhu 241000 China Department of Mathematics Northwest University Xi＇an 710069 China

Classification and reduction of the generalized fourth-order nonlinear differential equations arising from theliquid films are *** is shown that these equations have solutions on subspaces of the polynomial,exponential ortrigonometric form defined by linear nth-order ordinary differential equations with constant coefficients for n=4,...,*** examples of exact solutions are presented.

关键词： thin film equation classification invariant subspaces exact solutions

Invariant Sets and Exact Solutions to Higher-Dimensional Wave Equations

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Communications in Theoretical Physics 2008年第5期49卷 1119-1124页

作者： QU Gai-zhu ZHANG Shun-Li zhu chun-Rong Center for Nonlinear Studies Department of Mathematics Northwest University Xi＇an 710069 China Center of Nonlinear Science Ningbo University Ningbo 315211 China Department of Mathematics Anhui Normal University Wuhu 241000 China

The invariant sets and exact solutions of the （1 ＋ 2）-dimensional wave equations are discussed. It is shown that there exist a class of solutions to the equations which belong to the invariant set E0 = {u ： ux = ... 详细信息

关键词： wave equation invariant set exact solution

Continuous Quantum Nondemolition Measurements of a Particle in Electromagnetic and Gravitational Fields

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Communications in Theoretical Physics 2005年第3X期44卷 455-458页

作者： zhu chun-Hua ZHA Chao-Zheng Department of Physics Xinjiang University Wulumuqi 830046 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China

The detection of a particle in electromagnetic plus gravitational fields is investigated. We obtain a set of quantum nondemolition variables. The continuous measurements of these nondemolition parameters are analyzed in the framework of restricted path integral formalism. We manipulate the corresponding propagators, and deduce the probabilities associated with the possible measurement outputs.

关键词： continuous quantum nondemolition measurements restricted path integral

Pharmacokinetics and correlation between in vitro release and in vivo absorption of bio-adhesive pellets of panax notoginseng saponins

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Chinese Journal of Natural Medicines 2017年第2期15卷 142-151页

作者： LI Ying ZHANG Yun zhu chun-Yan Institute of Medicinal Plant Development Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100193China

The present study was designed to prepare and compare bio-adhesive pellets of panax notoginseng saponins(PNS) with hydroxy propyl methyl cellulose(HPMC), chitosan, and chitosan : carbomer, explore the influence of different bio-adhesive materials on pharmacokinetics behaviors of PNSbio-adhesive pellets, and evaluate the correlation between in vivo absorption and in vitro release(IVIVC). In order to predict the in vivo concentration-time profile by the in vitro release data of bio-adhesive pellets, the release experiment was performed using the rotating basket method in p H 6.8 phosphate buffer. The PNS concentrations in rat plasma were analyzed by HPLC-MS-MS method and the relative bioavailability and other pharmacokinetic parameters were estimated using Kinetica4.4 pharmacokinetic software. Numerical deconvolution method was used to evaluate IVIVC. Our results indicated that, compared with ordinary pellets, PNS bio-adhesive pellets showed increased oral bioavailability by 1.45 to 3.20 times, increased Cmax, and extended MRT. What's more, the release behavior of drug in HPMC pellets was shown to follow a Fickian diffusion mechanism, a synergetic function of diffusion and skeleton corrosion. The in vitro release and the in vivo biological activity had a good correlation, demonstrating that the PNS bio-adhesive pellets had a better sustained release. Numerical deconvolution technique showed the advantage in evaluation of IVIVC for self-designed bio-adhesive pellets with HPMC. In conclusion, the in vitro release data of bio-adhesive pellets with HPMC can predict its concentration-time profile in vivo.

关键词： Panax notoginseng saponins Bio-adhesive pellets Pharmacokinetics In vivo and in vitro correlation

Evolution of fermion resonance in thick brane

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Communications in Theoretical Physics 2024年第12期76卷 129-139页

作者： chun-chun zhu Qin Tan Yu-Peng Zhang Yu-Xiao Liu Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University Key Laboratory of Quantum Theory and Applications of Mo E Lanzhou University Lanzhou Center for Theoretical Physics & Key Laboratory of Theoretical Physics of Gansu Province Lanzhou University

In this work, we investigate the numerical evolution of massive Kaluza–Klein(KK) modes of a Dirac field on a thick brane. We deduce the Dirac equation in five-dimensional spacetime, and obtain the time-dependent evolution equation and Schr?dinger-like equation of the extradimensional component. We use the Dirac KK resonances as the initial data and study the corresponding dynamics. By monitoring the decay law of the left-and right-chiral KK resonances, we compute the corresponding lifetimes and find that there could exist long-lived KK modes on the brane. Especially, for the lightest KK resonance with a large coupling parameter and a large three momentum, it will have an extremely long lifetime.

关键词： braneworld dynamic evolution fermion resonance

INDUCED CRYSTALLIZATION BEHAVIOR OF POLY(ETHYLENE ADIPATE) BY HIGHLY ORIENTED POLYETHYLENE

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Chinese Journal of Polymer Science 2013年第8期31卷 1173-1182页

作者： chun-zhu Yan Lin Guo 常海波闫寿科 School of Chemistry and Environment Beihang University Chemistry and Chemical Engineering College Henan University State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The crystallization behavior of poly（ethylene adipate）（PEA） on highly oriented high-density polyethylene （PE） substrate both from solution and isotropic melt was studied by means of optical microscopy, differential scanning calorimetry, atomic force microscopy and electron diffraction. The results show that the PE influences the crystallization of PEA strongly, which results in an epitaxial growth of PEA with well ordered structure. At the boundary of the PE substrate, a transcrystalline PEA layer is observed. Fine structural observation illustrates that the PEA grows on the PE substrate in edge- on lamellae with fixed orientation. Electron diffraction demonstrates that the epitaxial organization of PEA on PE occurs with both polymer chains parallel, which leads to the （00l） PEA diffractions inclined ±23.5° to the chain direction of PE crystals. Combining the real space morphological observation and electron diffraction results, it is concluded that the epitaxial PEA edge-on lamellae are folded in the {00l} lattice planes.

关键词： Poly(ethylene adipate) Polyethylene Epitaxy Orientation.