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The Role of BMOA in the Boundedness of Weighted Composition Operators on the Unit Ball

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Acta Mathematica Sinica,English Series 2014年第2期30卷 323-330页

作者： chao ZhANG Guang Fu CAO College of Mathematics and Information Sciences Guangzhou University

We study the weighted composition operators Wh,on hardy space h2（B） whenever h ∈ BMOA（resp.h ∈ VMOA）.Analogous results are given for hp（B） spaces and the scale of weighted Bergman *** the latter case,BMOA is... 详细信息

关键词： Weighted composition operator boundedness compactness BMOA VMOA

OPTIMIZATION OF DESIGN PARAMETERS FOR FLUORESCENCE LAMINAR OPTICAL TOMOGRAPhY

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Journal of Innovative Optical health Sciences 2011年第3期4卷 309-323页

作者： chao-WEI ChEN YU ChEN Fischell Department of Bioengineering and Electrical and Computer Engineering 2218 Jeong h.Kim Building University of Maryland College ParkMD 20742USA

Laminar optical tomography(LOT)is a mesoscopic tomographic imaging technique ranging between confocal microscopy and diffuse optical tomography(DOT).Fluorescence LOT(FLOT)provides depth-resolved molecular information with 100-200μm resolution over 2-3mm *** this study,we use Monte Carlo simulation and singular-value analysis(SVA)to optimize the source-detector configurations for potential enhancement of FLOT imaging *** effects of different design parameters,including source incidence and detector collection angles,detector number,and sampling density,are *** results indicate that angled incidence/detection configuration might improve the imaging resolution and depth sensitivity,especially for low-scattering *** the number of detectors and the number of scanning steps will also result in enhanced imaging *** also demonstrate that the optimal imaging performance depends upon the background scattering coe±*** result might provide an optimization strategy for FLOT or LOT experimental setup.

关键词： Laminar optical tomography(LOT) fluorescence laminar optical tomography(FLOT) singular value analysis(SVA) image reconstruction

Note on The Phosphate Deposits in China

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地质学报 1948年第Z1期 79-82页

作者： C.Y.hSIEh C.h.chao Mineral Exploration Bureau

The earliest known phosphate deposit in China is the Chinpingshan;apatite deposit in Tunghai district,;*** the Sino-Japanesewar,a number of phosphorite deposits were discovered in Central Yunnan

关键词： Note on The Phosphate Deposits in China

Demetallation of organometallic and metal-mediated reactions

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The Innovation 2022年第4期3卷 19-21页

作者： chao-Jun Li Department of Chemistry and FQRNT Centre for Green Chemistry and Catalysis McGill University801 Sherbrooke Street WestMontrealQC H3A0B8Canada

The use of stoichiometric organometallic reagents and stoichiometric metals formed the basis of vast majority of classical reactions for constructing carbon–carbon *** indispensable requirement of stoichiometric metals for such reactions constitutes significant challenges in terms of resource sustainability,operational safety,and chemical-waste *** recent developments in C–h functionalizations,hydrogenative alkene/alkyne addition to electrophiles,the hydrazone umpolung chemistry,and other emerging fields such as the electrosynthesis and photoredox chemistry provide potential solutions to overcome these inherent challenges.

关键词： chemistry bonds overcome

Effect of Low-Frequency Power on Etching Characteristics of 6h-SiC in C4F8/Ar Dual-Frequency Capacitively Coupled Plasma

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Plasma Science and Technology 2013年第10期15卷 1066-1070页

作者： XU Yijun WU Xuemei YE chao Department of Physics Soochow University Suzhou 215006 China The Key Laboratory of Thin Films of Jiangsu Soochow University Suzhou 215006 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute ofMicrosystem and Information Technology Chinese Academy of Sciences Shanghai 200050China

Dry etching of 6h silicon carbide （6h-SiC） wafers in a C4Fs/Ar dual-frequency capacitively coupled plasma （DF-CCP） was investigated. Atomic force microscopy （AFM） and X-ray photoelectron spectroscopy （XPS） were used to measure the SiC surface structure and compositions, respectively. Optical emission spectroscopy （OES） was used to measure the relative concentration of F radicals in the plasma. It was found that the roughness of the etched SiC surface and the etching rate are directly related to the power of low-frequency （LF） source. At lower LF power, a smaller surface roughness and a lower etching rate are obtained due to weak bombardment of low energy ions on the SiC wafers. At higher LF power the etching rate can be efficiently increased, but the surface roughness increases too. Compared with other plasma dry etching methods, the DF-CCP can effectively inhibit CχFγ films＇ deposition, and reduce surface residues.

关键词： SiC plasma etching dual-frequency capacitively coupled plasma X-ray photoelectron spectroscopy optical emission spectroscopy

Bifunctional nanozyme activities of layered double hydroxide derived Co-A1-Ce mixed metal oxides for antibacterial application

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Journal of Oceanology and Limnology 2020年第4期38卷 1233-1245页

作者： ChEN chao WANG Yi ZhANG Dun CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Open Studio for Marine Corrosion and Protection Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Marine biofouling is an expensive problem that needs evolved chemical or physical antifouling ***,most of the current antifouling materials that would damage the environment through metal leaching and bacteria resistance are being *** is one kind of environmental antifouling materials through generating reactive oxygen species(ROS).We prepared various contents of CeO2 that could uniform disperse compounding with Co3 O4 and CoAl2 O4 to form a stable Co-Al-Ce mixed metal oxide(MMO) by a layered double hydroxide derived *** find that coupling with CeO2 can improve the peroxidase(POx) *** the molar ratio of Ce is 2.5% and the calcination temperature is 200℃,the POx activity of Co-Al-Ce MMO is the best caused by the good dispersion of catalytically active components and the high specific area(150.10±4.95 m2/g).This novel Co-Al-Ce MMO also exhibits an antibacterial mode of action Gram-negative bacteria in near-neutral ph solution through generating ROS(mainly ·O2-)in the presence of h2 *** containing MMO can be utilized as potential green marine antifouling material.

关键词： mixed metal oxide ceria enzyme mimic antibacterial marine biofouling

Synthesis of Calix[4]resorcinarene Core Dendrimers with Peripheral Salicylideneimine Functional Groups

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Chemical Research in Chinese Universities 2006年第4期22卷 537-542页

作者： hAN Jun GE Yun YAN chao-guo College of Chemistry ＆ Chemical Engineering Yangzhou University Yangzhou 225002 P. R. China

First to third-generation calix[4] resorcinarene core dendrimers, compounds 4a, 4b, 7a, 7b, 10a and 10b, were prepared via the divergent method in seven steps with the corresponding tetraphenyl- and tetra （hydroxyphenyl） calix[4] resorcinarenes （compounds 1a, 1b） as the starting material. The repeat units of the polyamidoamines of these dendrimers were obtained by the ammonolysis of ethyl calixarylacetates 2a and 2b with 1,3-diaminopropane, that is, amide derivatives with terminal amino groups, which in turn reacted with ethyl acrylate to give a higher generation of ester derivatives. The structures of these dendrimers were characterized by IR, ^1h and ^13C NMR spoctrometries. The crystal structure of compound 2b with 12 ethoxycarbonylmethoxy groups was determined by X-ray analysis.

关键词： Calixresorcinarene Dendrimer Schiffbase Amide Calixarene

The Stellar Spectra Factory(SSF)Based on SLAM

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Research in Astronomy and Astrophysics 2023年第5期23卷 148-159页

作者： Wei Ji chao Liu Bo Zhang Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Institute for Frontier in Astronomy and Astrophysics Beijing Normal UniversityBeijing 100875China

An empirical stellar spectral library with large coverage of stellar parameters is essential for stellar population synthesis and studies of stellar *** this work,we present Stellar Spectra Factory(SSF),a tool to generate empirical-based stellar spectra from arbitrary stellar atmospheric *** relative flux-calibrated empirical spectra can be predicted by SSF given arbitrary effective temperature,surface gravity,and *** constructs the interpolation approach based on the Stellar LAbel Machine,using ATLAS-A library,which contains spectra covering from O type to M type,as the training data *** is composed of four data-driven sub-models to predict empirical stellar ***-model SSF-N can generate spectra from A to K type and some M giant stars,covering 3700h]h 3520h]h 3295h]h 9000he predicted spectra is validated by comparing the flux of predicted spectra to those with same stellar parameters selected from the known spectral libraries,MILES and *** averaged difference of flux over optical wavelength between the predicted spectra and the corresponding ones in MILES and MaStar is less than 5%.More verification is conducted between the magnitudes calculated from the integration of the predicted spectra and the observations in PS1 and APASS bands with the same stellar *** significant systematic difference is found between the predicted spectra and the photometric *** uncertainty is 0.08 mag in the r band for SSF-gM when comparing with the stars with the same stellar parameters selected from *** uncertainty becomes 0.31 mag in the i band for SSF-dM when comparing with the st

关键词： methods statistical-techniques spectroscopic-stars atmospheres-stars general

Numerical study of test gas vitiation effects on hydrogen-fueled scramjet combustion

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航空动力学报 2012年第2期27卷 326-334页

作者： ChEN chao-qun TIAN Liang XU Xu School of Astronautics Beijing University of Aeronautics and AstronauticsBeijing 100191China

The effects of major vitiated species(h2O and CO2) and minor vitiated species(h,Oh and O radicals) produced by combustion air preheater on ignition and combustion of hydrogen-fueled scramjet were numerically ***,kinetic analyses with ChEMKIN SENKIN code were conducted to evaluate the effects of contamination on the ignition delay times of hydrogen fuel over a range of temperature and pressure *** numerical simulation of a three-dimensional reacting flow in hydrogen-fueled scramjet combustor was *** two-equation shear stress transport κ-ω turbulence model was used for modeling turbulence and 33 reactions finite-rate chemistry was used for modeling the h2/air *** results show that: free radical species such as h,O,and Oh may significantly promote the ignition process of hydrogen-air at relatively low initial temperature and ***,h2O and CO2 have inhibition effects on the ignition *** the same conditions,h2O has more effective inhibition effects than *** temperature and pressure rise due to combustion are lower in the air vitiated with h2O and CO2 because of their higher heat capacities and more *** efficiency and thrust calculated for vitiated air case are lower than clean air *** results indicate the importance of accounting for vitiation effects when extrapolating performance data from ground test to flight demonstration.

关键词： scramjet contaminant ignition supersonic combustion preheater