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Global existence theory for the two-dimensional derivative Ginzburg-Landau equation

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Chinese Science Bulletin 1998年第5期43卷 393-395页

作者： Zhenchao Cao Boling Guo Bixiang Wang xiamen univ Math Inst Xiamen 361005 Peoples R China Inst Appl Phys & Computat Math Beijing 100088 Peoples R China

The generalized derivative Ginzburg-Landau equation in two spatial dimensions is discussed. The existence and uniqueness of global solution are obtained by Galerkin method and by a priori estimates on the solution in ... 详细信息

关键词： Ginzburg-Landau equation global existence.

ASSIGNMENTS FOR THE GROUND STATES OF METAL MONOCARBONYLS

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Chinese Chemical Letters 1995年第10期6卷 887-890页

作者： Xin XU Nan Qin WANG Xin LU Qian Er ZHANG(State Key Laboratory for Physical Chemistry of the Solid Surface,Department of Chemistry,xiamen university,Fujian 361005) xiamen univ Dept Chem State Key Lab Phys Chem Solid Surface Xiamen 361005 Peoples R China

The bonding mechanisms between the first-row transition metal and carbon monoxide were discussed. Three basic rules have been drawn up to determine the ground states of the metal monocarbonyls. The theoretical assignm...

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Abnormal infrared effects of nanometer scale thin film material of PtPd alloy in CO adsorption

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Chinese Science Bulletin 2001年第17期46卷 1439-1442页

作者： Zhi Chen Shigang Sun Nan Ding Zhiyou Zhou xiamen univ Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China

Nanometer scale thin film material of PtPd alloy supported on glassy carbon (nm-PtPd/GC) was prepared by the electrochemical codeposition method under cyclic voltammetric conditions. STM patterns demonstrated that the prepared thin films are composed of layered crystallites in elliptic form. Electrochemical in situ FTIRS studies explored the abnormal infrared effects (AIREs) of nm-PtPd/GC for CO adsorption, which are (i) the remarkable enhancement of IR absorption, (ii) the inversion of COad band direction, and (iii) notable increase in the full width at half maximum (FWHM) of COad bands. The results demonstrated also that the enhancement factor of IR absorption varies with the thickness of PtPd alloy film and has reached a maximum value of 38.3 under the experimental conditions.

关键词： nm-PtPd/GC STM in situ FTIRS AIREs.

Ecological studies on Prochlorococcus in China seas

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Chinese Science Bulletin 2002年第15期47卷 1243-1250页

作者： Nianzhi Jiao Yanhui Yang xiamen univ Ctr Marine Environm Sci Minist Educ Key Lab Marine Environm Sci Xiamen 361005 Peoples R China

Prochlorococcus, a tiny oxygenic photosynthetic picoplankton with unique pigment composition, has been found to be ubiquitous and abundant in the world oceans, and has been recognized to be closely related to living resources and environmental issues. It has attracted the interest of marine biologists since its discovery, and field data on it over global oceans have accumulated rapidly in the past 10 years. In China, we have studied Prochlorococcus for 8 years, achieving a basic ecological understanding. The presence of Prochlorococcus in China seas, marginal seas of the west Pacific, was confirmed, and its distribution patterns were also brought to light. Prochlorococcus is very abundant in the South China Sea and the offshore regions of the East China Sea. It is seasonally present in the southeast part of the Yellow Sea and absent in the Bohai Sea. Temporal and spatial variations of the abundance of Prochlorococcus and their affecting factors, physiological and ecological characteristics of

关键词： Prochlorococcus divinyl-chlorophyll picoplankton ecology China seas.

The　Investigation　of　Oxygen　Absorption　over　LaOF　by　Means　of　Raman　Spectroscopy

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Chemical Research in Chinese universities 1995年第1期11卷 84-86页

作者： ZHOUmXiao-ping CHAO Zi-sheng WANG Shui-juWAN Hui-lin and Tsai Khi-Rui(Department of Chemistry, The National Key Laboratory ofSolid Surface Physics Chemistry , xiamen Uniuarsity, Xianten , 361005 ) xiamen univ NATL KEY LAB SOLID SURFACE PHYS CHEMDEPT CHEMXIAMEN 361005PEOPLES R CHINA

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ＴｈｅＩｎｖｅｓｔｉｇａｔｉｏｎｏｆＯｘｙｇｅｎＡｂｓｏｒｐｔｉｏｎｏｖｅｒＬａＯＦｂｙＭｅａｎｓｏｆＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｙＺＨＯＵｍＸｉａｏ－ｐｉｎｇ，ＣＨＡＯＺｉ－ｓｈｅｎｇ，ＷＡＮＧＳｈｕｉ－ｊｕＷＡＮＨｕｉ－ｌｉｎａｎｄＴｓａｉＫ...

关键词： Oxygen species Perturbed oxygen species O_2 absorption

Total integration method of three-dimensional fluorescence spectrometry

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Chinese Science Bulletin 1997年第18期42卷 1541-1544页

作者： Yan, Y Xu, JG Chen, GZ xiamen univ DEPT CHEMRES LAB SEDC ANALYT SCI MAT & LIFE CHEMXIAMEN 361005PEOPLES R CHINA

THREE-dimensional fluorescence spectrometry (TDFS) is a new technique of spectrofluorimetry that was developed two decades *** use of the abundant information

关键词： three-dimensional fluorescence spectrometry fluorescence Monte-Carlo integration.

Heterogeneously-catalyzed aerobic oxidation of furfural to furancarboxylic acid with CuO-Promoted MnO_(2)

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Green Energy & Environment 2023年第6期8卷 1683-1692页

作者： Xin Yu Tingke Jin Huiqiang Wang Guoqing Zhang Wenlong Jia Lincai Peng Yong Sun Xing Tang Xianhai Zeng Shuliang Yang Zheng Li Feng Xu Lu Lin College of Energy Xiamen UniversityXiamen361102China Institute of Geology Xibu Drilling Engineering Company LimitedChina National Petroleum CorporationXinjiang834000China BiomassChem Group Faculty of Chemical EngineeringKunming University of Science and TechnologyKunmingYunnan650500China Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass China xiamen Key Laboratory of High-valued Utilization of Biomass Xiamen UniversityXiamen361102China Beijing Forestry univ Inst Biomass Chem&TechnolBeijing100083China

A cost-effective and sustainable noble-metal free catalyst system based on ubiquitously available Mn-Cu bimetallic oxides was served as efficient catalysts for furfural selective oxidation to furancarboxylic acid(FA). Interestingly, Mn_(2)Cu_(1)O_(x)exhibited an excellent furfural conversion of 99% with quantitative selectivity toward FA. Especially, we demonstrate the significant weakening of the Mn-O bonds with the incorporation of CuO into the Mn-Cu oxides, resulting in an improved OLreactivity of Mn_(2)Cu_(1)O_(x), which brings about a higher catalytic activity for furfural oxidation. More importantly, Mn_(2)Cu_(1)O_(x)could exhibit YFA>90% over 5 cycles of reusability test. Through this study, the relationship between the morphology, surface chemistry, and catalytic activity of Mn-Cu bimetallic oxides are elucidated, providing a simple and environmentally friendly catalytic strategy and scientific basis for the development of Mn-Cu bimetallic oxides bioderived molecular aerobic oxidation materials.

关键词： Furfural Mn–Cu bimetallic oxides Oxidation Lattice oxygen Furancarboxylic acid

The Smoothness of Weak Solutions to the System of Second Order Differential Equations with Non-negative Characteristics

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Chinese Quarterly Journal of Mathematics 1993年第4期8卷 15-22页

作者：张克农 Dept.of Math.xiamen univ.xiamen 361005

In this paper,we will discuss smoothness of weak solutions for the system of second order differential equations eith non-negative *** of all,we establish boundary,and interior estimates and then we prove that solutio... 详细信息

关键词： diff equa with non-negative characteristics regularization weak solution boundary and interior estimate

Microscope in situ FTIRS studies of CO adsorption on an array of platinum micro-electrodes

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Chinese Science Bulletin 2001年第19期46卷 1612-1615页

作者： Hui Gong Shenpei Chen Zhiyou Zhou Shigang Sun xiamen univ Dept Chem Inst Phys Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China

An array of platinum microelectrodes was designed and fabricated. The adsorption of CO on such a Pt microelectrode (μ-Pt) was investigated by employing microscope in situ FTIR spectroscopy. A nanostructured film is formed at the surface of μ-Pt (denoted as μ-Pt(R)) when it has been subjected to a treatment of fast potential cycling. Abnormal infrared effects (AIREs) were observed in CO adsorption on the surface of μ-Pt(R), consisting of the inversion of the IR bipolar CO band and the extensively enhanced IR adsorption of COad species.

关键词： array of platinum microelectrodes microscope in situ FTIRS CO abnormal infrared effect.