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Spectral Dimension of a Modified Checker Board Fractal Lattice

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Chinese Physics Letters 1996年第5期13卷 325-328页

作者： CHEN Shu YANG zhan-ru CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Department of Physics and Institute of Theoretical PhysicsBeijing Normal UniversityBeijing 100875

We present a kind of modified checker board lattice and investigate the random uualk on the frac *** spectral dimension is determined via renormalization procedures and the inverse matrix method is used to renormalize... 详细信息

关键词： random inverse Modified

ON FUZZY h-IDEALS OF HEMIRINGS

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Journal of Systems Science & Complexity 2007年第3期20卷 470-478页

作者： Xueling MA and Jianming zhan Department of Mathematics Hubei Institute for Nationalities Enshi 445000 China.

The concept of quasi-coincidence of a fuzzy interval value in an interval valued fuzzy set is considered. In fact, this concept is a generalized concept of the quasi-coincidence of a fuzzy point in a fuzzy set. By using this new concept, the authors define the notion of interval valued （∈, ∈ Vq）fuzzy h-ideals of hemirings and study their related properties. In addition, the authors also extend the concept of a fuzzy subgroup with thresholds to the concept of an interval valued fuzzy h-ideal with thresholds in hemirings.

关键词： Hemirings h-ideals interval valued (∈ ∈ Vq)-fuzzy h-ideals interval valued fuzzy h-ideals with thresholds.

Generation of global 1-km daily top-of-atmosphere outgoing longwave radiation product from 2000 to 2021 using machine learning

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International Journal of Digital Earth 2023年第1期16卷 2002-2012页

作者： Chuan zhan Shunlin Liang School of Resources and Environmental Engineering Wuhan University of Science and TechnologyWuhanPeople's Republic of China Department of Geography The University of Hong KongPokfulamPeople's Republic of China

Top-of-atmosphere(TOA)outgoing longwave radiation(OLR),a key component of the Earth’s energy budget,serves as a diagnostic of the Earth’s climate system response to incoming solar ***,existing products are typically estimated using broadband sensors with coarse spatial *** paper presents a machine learning method to estimate TOA OLR by directly linking Moderate Resolution Imaging Spectroradiometer(MODIS)TOA radiances with TOA OLR determined by Clouds and the Earth’s Radiant Energy System(CERES)and other information,such as the viewing geometry,land surface temperature and cloud top temperature determined by Modern-Era Retrospective analysis for Research and Applications,Version 2(MERRA-2).Models are built separately under clear-and cloudy-sky conditions using a gradient boosting regression *** test results show that the root mean square errors(RMSEs)of the clear-sky and cloudy-sky models for estimating instantaneous values are 4.1 and 7.8 W/m^(2),***-time conversion ratios derived from CERES daily and hourly OLR data are used to convert the instantaneous MODIS OLR to daily ***-comparisons of the daily results show that the RMSE of the estimated MODIS OLR is 8.9 W/m^(2) in East *** developed high resolution dataset will be beneficial in analyzing the regional energy budget.

关键词： TOA outgoing longwave radiation MODIS CERES machine learning Earth’s energy budget

Integrated Evaluation on Highway Engineering Geological Hazard in Mountainous Area of Enshi, Hubei

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Wuhan University Journal of Natural Sciences 2006年第4期11卷 901-904页

作者： zhan Bin School of Transportation Wuhan University of Technology Wuhan 430063 Hubei China

Aiming at the geological features of highway engineering in mountainous area of Enshi, Hubei Province, the principles to set up an integrated evaluation system for highway engineering geological hazard are formulated. Then, the integrated evaluation system for highway engineering geological hazard in mountainous area of Enshi is established. In the evaluation system, the first-level evaluation indices are geological development degree, geological conditions, and damaging power, whereas the second-level indices including key factors affecting main kinds of geological hazard. Meanwhile, the borders of indices are determined. At last, the method of Fuzzy Comprehensive Evaluation （FCE） is adopted to quantitatively evaluate the highway engineering geological hazard in mountainous area of Enshi.

关键词： highway in mountainous area geological hazard integrated evaluation fuzzy comprehensive evaluation

Structure and function of rhizosphere and non-rhizosphere soil microbial community respond differently to elevated ozone in field-planted wheat

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Journal of Environmental Sciences 2015年第6期27卷 126-134页

作者： zhan Chen Xiaoke Wang He Shang Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Key Laboratory of Forest Ecology and EnvironmentState Forestry Administration State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

To assess the responses of the soil microbial community to chronic ozone（O3）, wheat seedlings（Triticum aestivum Linn.） were planted in the field and exposed to elevated O3（e O3）concentration. Three treatments were employed：（1） Control treatment（CK）, AOT40 = 0;（2） O3-1, AOT40 = 1.59 ppm·h;（3） O3-2, AOT40 = 9.17 ppm·h. Soil samples were collected for the assessment of microbial biomass C, community-level physiological profiles（CLPPs）, and phospholipid fatty acids（PLFAs）. EO3 concentration significantly reduced soil microbial carbon and changed microbial CLPPs in rhizosphere soil, but not in non-rhizosphere *** results of the PLFAs showed that e O3 concentrations had significant effects on soil community structure in both rhizosphere and non-rhizosphere soils. The relative abundances of fungal and actinomycetous indicator PLFAs decreased in both rhizosphere and non-rhizosphere soils, while those of bacterial PLFAs increased. Thus the results proved that e O3 concentration significantly changed the soil microbial community function and composition, which would influence the soil nutrient supply and carbon dynamics under O3 exposure.

关键词： O3 Wheat Rhizosphere soil Non-rhizosphere soil CLPP PLFA

Vectorial optical fields： recent advances and future prospects

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Science Bulletin 2018年第1期63卷 54-74页

作者： Jian Chen Chenhao Wan Qiwen zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China Department of Electro-Optics and Photonics University of Dayton Dayton OH 45469 USA School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 611731 China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

Driven by their potential applications, vectorial optical fields with spatially inhomogeneous states of polarization within the cross section have drawn significant attention recently. This work intends to review some of the latest development of this rapidly growing field of optics and offer a general overview of the current status of this field in a few areas. Mathematical descriptions of generalized vectorial optical fields are provided along with several special examples. A time-reversal methodology for the creation of a wide variety of exotic optical focal fields with prescribed characteristics within the focal volume is presented. Recently developed methods for the generation of vectorial optical fields that utilize fiber lasers,digital lasers, vectorial optical field generator, metasurfaces or photoalignment liquid crystals are summarized. The interactions of these vectorial optical fields with various micro-and nano-structures are presented and the prospects of their potential applications are discussed. The connection of vectorial optical fields with higher dimensionality in quantum information is summarized.

关键词： Vectorial optical field Cylindrical vector beam Full Poincaré beam Spatial light modulator Metasurface Spin-orbit interaction Quantum information Quantum communication

Effect of precipitation pH and coexisting magnesium ion on phosphate adsorption onto hydrous zirconium oxide

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Journal of Environmental Sciences 2019年第2期31卷 167-187页

作者： Jianwei Lin Xingxing Wang Yanhui zhan College of Marine Ecology and Environment Shanghai Ocean University

To understand the effect of precipitation pH and coexisting Mg^(2+) on phosphate adsorption onto zirconium oxide(ZrO_2), ZrO_2 particles precipitated at pH 5.3, 7.1 and 10.5, i.e., ZrO_2(5.3), ZrO_2(7.1)and ZrO_2(10.5), respectively were prepared and characterized, then their adsorption performance and mechanism in the absence and presence of Mg^(2+) were comparatively investigated in this study. The results showed that the Elovich, pseudo-second-order and Langmuir isotherm models correlated with the experimental data well. The adsorption mechanism involved the complexation between phosphate and zirconium. Coexisting Mg^(2+) slightly inhibited the adsorption of phosphate on ZrO_2(5.3), including the adsorption capacity and rate, but coexisting Mg^(2+) greatly increased the adsorption capacity and rate for ZrO_2(7.1)and ZrO_2(10.5). The enhanced adsorption of phosphate on ZrO_2(7.1) and ZrO_2(10.5) in the presence of Mg^(2+) was mainly due to the formation of Mg^(2+)-HPO_4^(2-) ion pair(MgHPO_4~0) in the solution and then the adsorption of MgHPO_4~0 on the adsorbent surface, forming the phosphatebridged ternary complex Zr(OPO_3H)Mg. In the absence of Mg^(2+) , the maximum phosphate adsorption capacity at pH 7 calculated from the Langmuir isotherm model decreased in the order of ZrO 2(7.1)(67.3 mg/g) > ZrO_2(5.3)(53.6 mg/g) ≈ ZrO_2(10.5)(53.1 mg/g), but it followed the order of Zr O2(7.1)(97.0 mg/g) > ZrO_2(10.5)(79.7 mg/g) > ZrO_2(5.3)(51.3 mg/g) in the presence of Mg^(2+) . The results of this work suggest that ZrO_2(7.1) is more suitable for use as an adsorbent for the effective removal of phosphate from municipal wastewater than ZrO_2(5.3) and ZrO_2(10.5),because Mg^(2+) is generally present in this wastewater.

关键词： Hydrous zirconium oxide Different precipitation pH values Adsorption Phosphate Magnesium ion Effect

Gelfand-Kirillov Dimension and Reducibility of Scalar Generalized Verma Modules for Classical Lie Algebras

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Acta Mathematica Sinica,English Series 2024年第3期40卷 658-706页

作者： zhan Qiang BAI Jing JIANG School of Mathematical Sciences Soochow UniversitySuzhou 215006P.R.China E-mail:zqbai@*** jjsd6514@***

Let g be a classical complex simple Lie algebra and q be a parabolic *** M be a generalized Verma module induced from a one dimensional representation of *** M is called a scalar generalized Verma *** this paper,we will determine the reducibility of scalar generalized Verma modules associated to maximal parabolic subalgebras by computing explicitly the Gelfand-Kirillov dimension of the corresponding highest weight modules.

关键词： Generalized Verma module Gelfand-Kirillov dimension Young tableau

Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy

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International Journal of Minerals,Metallurgy and Materials 2018年第8期25卷 937-949页

作者： Xiao-ping Ren zhan-qiang Liu School of Mechanical Engineering Shandong University Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of EducationShandong University

The microstructural changes in the machined surface layer of Ni-based super alloys essentially determine the final performance of the structural components of aerospace engines in which these alloys are *** this work,multiscale metallurgical observations using scanning electron microscopy,electron-backscatter diffraction microscopy,and transmission electron microscopy were conducted to quantitatively characterize the microstructure of the machined ***,to elucidate the factors that affect the formation of the refinement microstructure,the distributions of the deformation parameters(strain,strain rate,and temperature) in the machined subsurface were analyzed.A dislocation–twin interaction dynamic recrystallization mechanism for grain refinement during machining of Inconel 718 is ***,microhardness evolution induced by grain refinement in the machined surface is *** results suggest that the gradient microstructure and the work hardening can be optimized by controlling the cutting parameters during turning of Inconel 718.

关键词： grain refinement dislocation–twin interaction work hardening turning Inconel 718