检索结果-南通市图书馆

Faraday Effect on Negative Refraction in Uniaxial Anisotropic Plasma Metamaterials

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第10期30卷 120-123页

作者： guo bin School of Science Wuhan University of TechnologyWuhan 430070 Department of Electrical and Computer EngineeringUniversity of AlbertaEdmontonABT5K 2M3Canada

Negative refraction is the name for an electromagnetic phenomenon in which light rays are refracted at an interface in the reverse sense to that normally expected.A uniaxial anisotropic plasma metamaterial that exhibits negative refraction is demonstrated and the necessary conditions are derived for negative *** Faraday effect on the negative refraction in the proposed plasma metamaterials is *** dependences such as plasma filling factor,dielectric constant of background materials,and external magnetic field are calculated and discussed.

关键词： refraction Faraday dielectric

Finite Groups with Seminormal Sylow Subgroups

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

Acta Mathematica Sinica,English Series 2008年第10期24卷 1751-1757页

作者： Wen bin guo Department of Mathematics Xuzhou Normal University Xuzhou 221116 P. R. China Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China

In this paper, we prove the following theorem： Let p be a prime number, P a Sylow psubgroup of a group G and π = π（G）／ {p}. If P is seminormal in G, then the following statements hold： 1） G is a p-soluble group and P＇ ≤ Op（G）; 2） lp（G） ≤ 2 and lπ（G） ≤ 2; 3） if a π-Hall subgroup of G is q-supersoluble for some q ∈ π, then G is q-supersoluble.

关键词： finite groups seminormal subgroups Sylow subgroups p-soluble groups p-supersoluble groups

Preparation of Fe3O4-porphyrin Nano-composited Particles and Their Optical and Magnetic Properties

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2017年第4期33卷 530-533页

作者： guo Ximing guo bin School of Life Science of Technology Institution Harbin Institute of Technology Harbin 150001 P. R. China School of Materials Science and Engineering Institution Harbin Institute of Technology Harbin 150001 P. R. China

Magnetic Fe3O4 nanoparticles were synthesized via the coprecipitation of ferrous and ferric ion. The morphology and magnetic properties of the magnetic Fe3O4 nanoparticles were investigated by transmission electron microscopy（TEM） and superconducting quantum interference device. Furthermore, the Fe3O4-porphyrin nanocompo- site particles（FeOPNCPs） are prepared with Fe3O4 and porphyrin by sol-gel method. The patterns of FeOPNCPs were also characterized by means of scanning electron microscopy（SEM） and TEM. The optical and magnetic properties of FeOPNCPs were investigated on a UV-Vis spectrophotometer, a fluorescence spectrophotometer and a supercon- ducting quantum interference device. These experimental results show that FeOPNCPs not only possess optical features of porphvrin but also retain the superoaramagnetic features of Fe3O4 nanoparticles.

关键词： Fe3O4 Porphyrin Nano-composited particle Fluorescence Magnetic property

Active event-driven reliable defense control for interconnected nonlinear systems under actuator faults and denial-of-service attacks

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

Science China(Information Sciences) 2022年第6期65卷 155-171页

作者： bin guo Songyi DIAN Tao ZHAO College of Electrical Engineering Sichuan University

This study investigates the reliable control design for a class of interconnected nonlinear systems subjected to actuator faults, disturbances, and denial-of-service(DoS) attacks. DoS attacks are carried out in both sensor and controller channels. An integrated event-observer-based security sliding mode fault-tolerant control approach is presented to defend against DoS attacks and compensate for faults and *** be more specific, the fuzzy logic system(FLS) theory is used to approximate the unknown nonlinear component first. Using the output measurement and sensor channel triggered output information, an FLS aided nonlinear estimator is put forward, in which the faults and disturbances are reconstructed. Then, to achieve the trajectory tracking purpose in the presence of DoS attacks, actuator faults, and disturbances, an adaptive sliding mode manifold is established, based on which an event-driven mechanism is established and a reliable controller is designed. In the controller scheme, the fault compensation and disturbance rejection mechanisms are also included synchronously. The tracking ability is analyzed using the Lyapunov method and the FLS theory, followed by applications to an interconnected power network system and an interconnected inverted pendulum system to demonstrate the applicability of the proposed method.

关键词： interconnected nonlinear system actuator fault DoS attack disturbance fault-tolerant control event-driven control

Proof of Six-Wave Resonance Conditions of Ocean Surface Gravity Waves in Deep Water

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2019年第6期33卷 734-738页

作者： LIN guo-bin HUANG Hu Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering Science Shanghai University

A necessary big step up in the modern water wave theories and their widespread application in ocean engineering is how to obtain 6-wave resonance conditions and to prove it. In the light of the existing forms and characteristics of 3-wave, 4-wave and 5-wave resonance conditions, the 6-wave resonance conditions are proposed and proved for currently a maximum wave-wave resonance interactions of the ocean surface gravity waves in deep water, which will be indispensable to both the Kolmogorov spectrum of the corresponding universal wave turbulence and a synthetic 4-5-6-wave resonant model for the ocean surface gravity waves.

关键词： 6-wave resonance conditions proof ocean surface gravity waves in deep water wave turbulence

Negative refraction in a rotational plasma metamaterial

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2019年第1期21卷 13-18页

作者： Yemin ZHAN bin guo Department of Physics Wuhan University of Technology

The features of negative refraction are investigated by using a rotational plasma metamaterial. It is assumed that the plasma metamaterial is composed of plasma and dielectric material periodically. The analytical results show that the plasma density, plasma filling factor, and rotation angle significantly changed the properties of negative refraction. Interestingly, the plasma metamaterial without exhibiting negative refraction effect will show negative refraction when rotating the optical axis of the metamaterial, while the range of incident angle for negative refraction will be reduced or even disappear for the plasma metamaterial exhibiting negative refraction effect when rotating the optical axis. Moreover, the full-angle negative refraction can be obtained by specific rotation angle and plasma density. The effects of plasma density, plasma filling factor and the rotation angle on the properties of THE negative refraction effect are also explored and discussed in detail.

关键词： negative refraction plasma metamaterial Poynting vector rotational

Multiscale simulation and nanoindentation experimental study of initial plasticity of Fe single crystal

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 458-462页

作者： YUAN Lin SHAN De-bin guo bin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Ministry of EducationHarbin Institute of TechnologyHarbin 150001China

It is very important to understand the initial plastic behavior of metals at *** order to research the initial plasticity of body centered cubic metals in micro-/nano-scale,the multiscale simulation method and experimental study were used to study the nanoindentation process of Fe single *** results show that the first abruption of load-displacement curve in nanoindentation of Fe single crystal can be attributed to the first transition from elastic to plastic deformation characterized by the dislocation emission.

关键词： initial plasticity nanoindentation multiscale simulation dislocation

Study on Atomic Fluorescence Spectrometry Excited by Synchrotron Radiation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第5期21卷 427-432页

作者： Jia-jia guo Wu-er Gana guo-bin Zhang Qing-de Sua Department of Chemistry University of Science and Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230027 China

A novel analysis approach using atomic fluorescence excited by synchrotron radiation is presented. A system for synchrotron radiation-atomic fluorescence spectrometry is developed, and experimental conditions such as flow rate, analyte acidity, concentration of pre-reducing and hydrogenation system are optimized. The proposed method is successfully applied to get an excitation spectrum of arsenic. Seven of ten primary spectral lines, four of which have never been reported by means of atomic fluorescence spectrometry, agree well with the existing reports. The other three are proposed for the first time. Excitation potentials and possible transitions are investigated. Especially for the prominent line at 234.99 nm, the mechanism of generation is discussed and a model of energy transition processes is proposed.

关键词： Synchrotron radiation Atomic fluorescence Arsenic Energy transition

Porosity model and pore evolution of transitional shales:an example from the Southern North China Basin

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

Petroleum Science 2020年第6期17卷 1512-1526页

作者： Xiao-Guang Yang Shao-bin guo School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationBeijing 100083China

The evolution of shale reservoirs is mainly related to two functions:mechanical compaction controlled by ground stress and chemical compaction controlled by thermal *** simulation experiments were conducted to simulate the chemical compaction of marine-continental transitional shale,and X-ray diffraction(XRD),CO2 adsorption,N2 adsorption and high-pressure mercury injection(MIP)were then used to characterize shale diagenesis and ***,simulations of mechanical compaction adhering to mathematical models were performed,and a shale compaction model was proposed considering clay content and kaolinite *** advantage of this model is that the change in shale compressibility,which is caused by the transformation of clay minerals during thermal evolution,may be *** combination of the thermal simulation and compaction model may depict the interactions between chemical and mechanical *** interactions may then express the pore evolution of shale in actual conditions of ***,the obtained results demonstrated that shales having low kaolinite possess higher porosity at the same burial depth and clay mineral content,proving that other clay minerals such as illite-smectite mixed layers(I/S)and illite are conducive to the development of *** possessing a high clay mineral content have a higher porosity in shallow layers(3500 m).Both the amount and location of the increase in porosity differ at different geothermal *** geothermal gradients favor the preservation of high porosity in shale at an appropriate *** pore evolution of the marine-continental transitional shale is divided into five *** 2 possesses an Ro of 1.0%-1.6%and has high porosity along with a high specific surface *** 3 has an Ro of 1.6%-2.0%and contains a higher porosity with a low specific surface ***,Stage 4 has an Ro of 2.0%-2.9%with a low porosity and h

关键词： Thermal simulation Porosity model Pore evolution Transitional shale Southern North China Basin Shanxi formation