检索结果-南通市图书馆

Chlorine doped graphitic carbon nitride nanorings as an efficient photoresponsive catalyst for water oxidation and organic decomposition

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第10期35卷 2288-2296页

作者： er-Xun Han Yuan-Yuan Li Qi-Hao Wang Wei-Qing Huang Leng luo Wangyu Hu gui-Fang Huang Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Materials Science and Engineering Hunan UniversityChangsha 410082China

Rationally engineering the microstructure and electronic structure of catalysts to induce high activity for versatile applications remains a challenge. Herein, chlorine doped graphitic carbon nitride(Cl-doped g-C3N4) nanorings have been designed as a superior photocatalyst for pollutant degradation and oxygen evolution reaction(Oer). Remarkably, Cl-doped g-C3N4 nanorings display enhanced Oer performance with a small overpotential of approximately 290 m V at current density of 10 m A cm^-2 and Tafel slope of 83 m V dec-1, possessing comparable Oer activity to precious metal oxides RuO2 and IrO2/C. The excellent catalytic performance of Cl-doped g-C3N4 nanorings originates from the strong oxidation capability,abundant active sites exposed and efficient charge transfer. More importantly, visible light irradiation gives rise to a prominent improvement of the Oer performance, reducing the Oer overpotential and Tafel slope by 140 m V and 28 m V dec^-1, respectively, demonstrating the striking photo-responsive Oer activity of Cl-doped g-C3N4 nanorings. The great photo-induced improvement in Oer activity would be related to the efficient charge transfer and the·OH radicals arising spontaneously on CN-Cl100 catalyst upon light irradiation. This work establishes Cl-doped g-C3N4 nanorings as a highly competitive metal-free candidate for photoelectrochemical energy conversion and environmental cleaning application.

关键词： Cl-doped g-C3N4 Nanoring Electrocatalysts Oxygen evolution reaction Pollutant degradation

Hamiltonian Systems and Darboux Transformation Associated with a 3 × 3 Matrix Spectral Problem

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2X期48卷 205-210页

作者： luo Lin FAN En-gui Department of Mathematics Xiaogan University Xiaogan 432100 China School of Mathematics Fudan University Shanghai 200433 China

Starting from a 3 × 3 matrix spectral problem, we derive a hierarchy of nonlinear equations. It is shown that the hierarchy possesses bi-Hamiltonian structure. Under the symmetry constraints between the potentials and the eigenfunctions, Lax pair and adjoint Lax pairs including partial part and temporal part are nonlinearied into two finitedimensional Hamiltonian systems （FDHS） in Liouville sense. Moreover, an explicit N-fold Darboux transformation for CDNS equation is constructed with the help of a gauge transformation of the spectral problem.

关键词： nonlinear equations Hamiltonian system symmetry constraint Darboux transformation

Hamiltonian System and Infinite Conservation Laws Associated with a New Discrete Spectral Problem

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第6期49卷 1399-1402页

作者： luo Lin FAN En-gui Department of Mathematics Xiaogan University Xiaogan 432100 China School of Mathematics Fudan University Shanghai 200433 China

Starting from a new discrete spectral problem, the corresponding hierarchy of nonlinear lattice equations is proposed. It is shown that the lattice soliton hierarchy possesses the bi-Hamiltonian structures and infinit... 详细信息

关键词： Hamiltonian system infinite conservation laws discrete spectral problem

A modified domain reduction method for numerical simulation of wave propagation in localized regions

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2019年第1期18卷 35-52页

作者： luo Chao Lou Menglin gui Guoqing Wang Hao School of Civil Engineering Shijiazhuang Tiedao University Cooperative Innovation Center of Disaster Prevention and Mitigation for Large Infrastructure in Hebei province (Shijiazhuang Tiedao University) State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University School of Architecture and Civil Engineering Jinggangshan University

A modified domain reduction method(MDRM) that introduces damping terms to the original DRM is presented in this paper. To verify the proposed MDRM and compare the computational accuracy of these two methods, a numerical test is designed. The numerical results of the MDRM and DRM are compared using an extended meshed model. The results show that the MDRM significantly improved the computational accuracy of the DRM. Then, the MDRM is compared with two existing conventional methods, namely Liao's transmitting boundary and viscous-spring boundary with Liu's method. The MDRM shows its great advancement in computational accuracy, stability and range of applications. This paper also discusses the influence of boundary location on computational accuracy. It can be concluded that smaller models tend to have larger errors. By introducing two dimensionless parameters, φ_1 and φ_2, the rational distance between the observation point and the MDRM boundary is suggested. When φ_1 >2 or φ_2>13, the relative PGA error can be limited to 5%. In practice, the appropriate model size can be chosen based on these two parameters to achieve desired computational accuracy.

关键词： modified domain reduction method domain reduction method viscous boundary viscous spring boundary transmitting boundary wave propagation

Grand Research Plan for Neural Circuits of Emotion and Memory-Current status of neural circuit studies in China

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2013年第1期29卷 121-124页

作者： Yuan-gui Zhu He-Qi Cao er-Dan Dong Department of Health Sciences National Natural Science Foundation of China

During recent years, major advances have been made in neuroscience, i.e., asynchronous release, three-dimensional structural data sets, saliency maps, magnesium in brain research, and new functional roles of long non-coding RNAs. Especially, the development of optogenetic technology provides access to important information about relevant neural circuits by allowing the activation of specific neurons in awake mammals and directly observing the resulting behavior. The Grand Research Plan for Neural Circuits of Emotion and Memory was launched by the National Natural Science Foundation of China. It takes emotion and memory as its main objects, making the best use of cutting-edge technologies from medical science, life science and information science. In this paper, we outline the current status of neural circuit studies in China and the technologies and methodologies being applied, as well as studies related to the impairments of emotion and memory. In this phase, we are making efforts to repair the current deficiencies by making adjustments, mainly involving four aspects of core scientific issues to investigate these circuits at multiple levels. Five research directions have been taken to solve important scientific problems while the Grand Research Plan is implemented. Future research into this area will be multimodal, incorporating a range of methods and sciences into each project. Addressing these issues will ensure a bright future, major discoveries, and a higher level of treatment for all affected by debilitating brain illnesses.

关键词： neural circuits emotion and memory funding Grand Research Plan

Weak Signal Frequency Detection Based on a Fractional-Order Bistable System

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第6期29卷 13-16页

作者： HE gui-Tian luo Mao-Kang Department of Mathematics Sichuan UniversityChengdu 610064

We apply spectral power amplification to quantifying and investigating the phenomenon of stochastic resonance in fractional-order ***,the frequency of the weak mixed signal is detected by a stochastic resonance mechanism together with a power *** corresponding numerical results demonstrate the effectiveness of the proposed methods.

关键词： spectrum methods stochastic

An optimal quality adaptation mechanism for end-to-end FGS video transmission

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第Z1期7卷 119-124页

作者： er gui-hua Broadband Networks & Digital Media Laboratory Department of Automation Tsinghua UniversityBeijing 100084China

In this paper, we propose a novel optimal quality adaptation algorithm for MPEG-4 fine granular scalability (FGS)stream over wired network. Our algorithm can maximize perceptual video quality by minimizing video quality variation and increasing available bandwidth usage rate. Under the condition that the whole bandwidth evolution is known, we design an optimal algorithm to select layer. When the knowledge of future bandwidth is not available, we also develop an online algorithm based on the optimal algorithm. Simulation showed that both optimal algorithm and online algorithm can offer smoothed video quality evolution.

关键词： MPEG-4 fine granular scalability (FGS), Video streaming, Transmission, Quality adaptation

Surface modification of Ti-49.8at%Ni alloy by Ti ion implantation: phase transformation, corrosion, and cell behavior

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 868-875页

作者： Yan Li Ting Zhou Peng luo Shuo-gui Xu School of Materials Science and Engineering Beihang University Changhai Hospital Department of Emergency the Second Military Medical University

The Ti-49.8at%Ni alloy was modified by Ti ion implantation to improve its corrosion resistance and biocompatibility. The chemical composition and morphologies of the Ti Ni alloy surface were determined using atomic force microscopy(AFM), auger electron spectroscopy(AES), and X-ray photoelectron spectroscopy(XPS). The results revealed that Ti ion implantation caused the reduction of Ni concentration and the formation of a Ti O2 nano-film on the Ti Ni alloy. The phase transformation temperatures of the Ti–Ti Ni alloy remained almost invariable after Ti ion implantation. Electrochemical tests indicated that the corrosion resistance of Ti Ni increased after Ti ion implantation. Moreover, the Ni ion release rate in 0.9% Na Cl solution for the Ti Ni alloy remarkably decreased due to the barrier effect of the Ti O2 nano-film. The cell proliferation behavior on Ti-implanted Ti Ni was better than that on the untreated Ti Ni after cell culture for 1 d and 3 d.

关键词： titanium–nickel alloys surface modification ion im

Numerical realization of the conditions of Max Nther's residual intersection theorem

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2014年第4期29卷 481-502页

作者： luo Zhong-xuan FENG er-bao ZHANG Jie-lin School of Software Dalian University of Technology School of Mathematical Sciences Dalian University of Technology

The aim of this paper is to study numerical realization of the conditions of Max Nother＇s residual intersection theorem. The numerical realization relies on obtaining the inter- section of two algebraic curves by homotopy continuation method, computing the approximate places of an algebraic curve, getting the exact orders of a polynomial at the places, and determin- ing the multiplicity and character of a point of an algebraic curve. The numerical experiments show that our method is accurate, effective and robust without using multiprecision arithmetic, even if the coefficients of algebraic curves are inexact. We also conclude that the computational complexity of the numerical realization is polynomial time.

关键词： algebraic curve Puiseux expansion place homotopy continuation multiple root.