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The Pressure in Operator Algebras

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Acta Mathematica Sinica,English Series 2008年第6期24卷 983-996页

作者： Cheng jun hou Department of Mathematics Qufu Normal University Qufu 273165 P. R. China

We introduce two notions of the pressure in operator algebras, one is the pressure Pα（π, T） for an automorphism α of a unital exact C^＊-algebra A at a self-adjoint element T in A with respect to a faithful unital ＊-representation π the other is the pressure Pτ,α（T） for an automorphism α of a hyperfinite von Neumann algebra M at a self-adjoint element T in M with respect to a faithful normal α-invariant state τ. We give some properties of the pressure, show that it is a conjugate invaxiant, and also prove that the pressure of the implementing inner automorphism of a crossed product A×α Z at a self-adjoint operator T in A equals that of α at T.

关键词： exact C^*-algebra hyperfinite von Neumann algebra entropy pressure crossed product

Degradation of 2,4-dichlorophenoxyacetic acid in water by ozonehydrogen peroxide process

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Journal of Environmental Sciences 2006年第6期18卷 1043-1049页

作者： YU Ying-hui MA jun hou Yan-jun School of Municipal and Environmental Engineering Harbin Institute of Technology P.O. Box 2627 Harbin 150090 China

This study reports an investigation into the degradation of 2,4-dichlorophenoxyacetic acid in bubble contactor column by O2/H2O2 process, which is widely used as a principal advanced oxidation process. The degradation of 2,4-dichlorophenoxyacetic acid was studied under different H202/O3 molar ratio and pH value. Meanwhile, TOC removal was investigated both in distilled water and tap water. The influences of ozone transfer and consumed hydrogen peroxide were also discussed. The degradation products and oxidation intermediates were identified by GC-MS and LC-MS. A possible reaction mechanism was thus proposed.

关键词： 2,4-dichlorophenoxyacetic acid ozone hydrogen peroxide advanced oxidation process

Continuous Orbit Equivalence of Semigroup Actions

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Acta Mathematica Sinica,English Series 2024年第6期40卷 1581-1598页

作者： Xiang Qi QIANG Cheng jun hou School of Mathematical Science Yangzhou UniversityYangzhou 225002P.R.China

We introduce notions of continuous orbit equivalence and its one-sided version for countable left Ore semigroup actions on compact spaces by surjective local homeomorphisms,and characterize them in terms of the corresponding transformation groupoids and their operator *** particular,we show that two essentially free semigroup actions on totally disconnected compact spaces are continuously orbit equivalent if and only if there is a canonical abelian subalgebra preserving C^(∗)-isomorphism between the associated transformation groupoid C^(∗)-*** also give some examples of orbit equivalence,consider the special case of semigroup actions by homeomorphisms and relate continuous orbit equivalence of semigroup actions to that of the associated group actions.

关键词： Semigroup action continuous one-sided orbit equivalence continuous orbit equivalence groupoid C^(∗)-algebras

Mean shift based log-Gabor wavelet image coding

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 620-624页

作者： LI Ji-liang FANG Xiang-zhong hou jun Institute of Image Communication and Information Processing Shanghai Jiao Tong University Shanghai 200240 China

In this paper, we propose a sparse overcomplete image approximation method based on the ideas of overcomplete log-Gabor wavelet, mean shift and energy concentration. The proposed approximation method selects the necessary wavelet coefficients with a mean shift based algorithm, and concentrates energy on the selected coefficients. It can sparsely approximate the original image, and converges faster than the existing local competition based method. Then, we propose a new compression scheme based on the above approximation method. The scheme has compression performance similar to JPEG 2000. The images decoded with the proposed compression scheme appear more pleasant to the human eyes than those with JPEG 2000.

关键词： Sparse approximation Log-Gabor Image coding Mean shift Overcomolete

Pillar[n]arenes: Chemistry and Their Material Applications

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Chinese Journal of Chemistry 2020年第2期38卷 215-217页

作者： Harekrushna Behera Lu Yang jun-Li hou Department of Chemistry Fudan University220 Handan RoadShanghai 200433China Department of Chemistry Western UniversityLondonOntarioCanada

Background Pillar[n]arene(PA[n])contains a symmetrical structures,where para-bridge connection between the units looks like a column-like or pillar shape and polygonal structure from side and top views,*** attached gr... 详细信息

关键词： attached directions opposite

Performance Analysis in SWIPT-Based Bidirectional D2D Communications in Cellular Networks

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China Communications 2023年第12期20卷 41-51页

作者： Yang Zhang Wei Wang Xiangmo Zhao jun hou School of Information Engineering Chang’an UniversityXi’an 710064China

In this paper,a novel traffic-aware cooperative cognitive radio network that can enable deviceto-device(D2D)communications in cellular system is proposed and *** providing relay cooperation to cellular transmission,D2D users can realize their own two-way communication in the licensed *** most existing works,in the proposed network,both wireless-powered D2D users can harvest energy via radio-frequency signals received from basic station(BS)through a hybrid protocol which can adaptively utilize both time-switching and powersplitting ***,D2D users perform decode-and-forward operation to transmit signals,and mobile user(MU)employs a selection combining *** addition,the performance of both D2D system and cellular system in the proposed network is evaluated by deriving the expressions of their exact outage probability and *** and simulation results validate correctness of derivations and reveal the influence of various system parameters of the proposed network.

关键词： D2D communication outage probability SWIPT

Enhanced second harmonic generation in a two-dimensional optical micro-cavity

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Chinese Physics B 2018年第3期27卷 286-290页

作者： Jian-jun Zhang Hui-Fang Wang jun-Hua hou School of Physics and Information Science Shanxi Normal University Linfen 041004 China

We introduce a two-dimensional Bose-Einstein condensation model consisting of massive photon and photon-pair. Based on the new nonlinear model, the traditional process of second harmonics generation is reinvestigated. In order to describe the process, a new quantum phase, the harmonic phase, is introduced. The order parameter of the new physical phase is also given in this paper.

关键词： Bose-Einstein condensation quantum phase transition photon

Deformylated Gramicidin A and Its Derivatives Showing High Antimicrobial Activity and Low Hemolytic Toxicity

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Chinese Journal of Chemistry 2019年第1期37卷 25-29页

作者： Wei-Wei Haoyang Min Zhang jun-Li hou Department of Chemistry Fudan University220 Handan RoadShanghai 200433China

Summary of main observation and conclusion Gramicidin A is a natural peptide,which shows high antimicrobial activity to Gram-positive bacteria. However,the hemolytic toxicity prevents its therapeutic *** demonstrated that by simply removing the formyl group at the N terminus,the hemolytic toxicity of the peptide could be obviously *** deformylated gramicidin A (1)could efficiently insert into the lipid bilayer to form transmembrane *** peptide can also selectively insert into the membrane of Gram-positive bacteria but not that of erythrocytes,leading to its high antimicrobial activity and very low hemolytic *** derivation of 1 could be achieved by decoration at the terminal NH2 group,which also produced peptides showing high activity and low hemolytic *** derivation method provided us with an efficient strategy to build a library for future activity and cytotoxicity screening in vitro and in vivo.

关键词： peptide build group

An Analytic Model of Galactic Winds and Mass Outflows

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Chinese Journal of Astronomy and Astrophysics 2005年第4期5卷 327-346页

作者： Cheng-Gang Shu hou-jun Mo Shu-De Mao Joint Center for Astrophysics Shanghai Normal University Shanghai 200234 Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 Max-Planck-Institut fuer Astrophysik Karl-Schwarzschild-Strasse 1 Postfach 1317 D-85741 Garching Germany Astronomy Department University of Massachusetts Amherst MA 01003 USA Jodrell Bank Observatory Univ. of Manchester Macclesfield Cheshire SK11 9DL UK

Galactic winds and mass outflows are observed both in nearby starburst galaxies and in high-redshiff star-forming galaxies. We develop a simple analytic model to understand the observed superwind phenomenon with a discussion of the model uncertainties. Our model is built upon the model of McKee ＆ Ostriker for the interstellar medium. It allows one to predict how properties of a superwind,such as wind velocity and mass outflow rate, are related to properties of its starforming host galaxy, such as size, gas density and star formation rate. The model predicts a threshold of star formation rate density for the generation of observable galactic winds. Galaxies with more concentrated star formation activities produce superwinds with higher velocities. The predicted mass outflow rates are comparable to （or slightly larger than） the corresponding star formation rates. We apply our model to both local starburst galaxies and high-redshift Lyman break galaxies,and find its predictions to be in good agreement with current observations. Our model is simple and so can be easily incorporated into numerical simulations and semi-analytical models of galaxy formation.

关键词： galaxies starburst - galaxies ISM - galaxies kinematics and dynamics - galaxies formation and evolution