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Dynamics of Wetland Landscape Pattern in Kaifeng City from 1987 to 2002

Chinese Geographical Science 2008年第2期18卷 146-154页

作者： cao xinxiang College of History and Culture Henan University Kaifeng 475001 China Key Research Institution of Yellow River Civilization and Sustainable Development Henan University Kaifeng 475001 China

It is very significant for urban development and urban wetland protection and utilization to probe into the process and reasons of urban wetland landscape dynamics. Taking the information of remote sensing and detailed land survey data as the basic information sources, with the help of RS and GIS, according to the principles and methods of landscape ecology, this paper analyzed wetland landscape pattern dynamics and its reasons in Kaifeng City, Henan Province of China, from 1987 to 2002. The results show that the total wetland area in Kaifeng City firstly reduced by 20.1% from 1987 to 1990 and then increased from 1990 to 2002, with an average annual growth rate of 3.3%. At the same time, landscape fragment degree and landscape dominance degree increased, respectively from 0.64 to 0.72 and from 0.3754 to 0.5563, but mean patch area, maximum patch area, patch fractal dimension reduced. As far as single landscape element concerned, fi＇om 1987 to 2002, patch area, patch number, patch density, patch shape and patch location changed in varying degrees in all wetland types in Kaifeng City, among which rice field changed most and others relatively less. In the recent 20 years, rice fields, lake wetlands, puddles and ponds had a higher stability, but river and bottomland wetlands were mostly transformed to land use types. The change of wetland landscape pattern was the result of the combined action of the Huanghe （Yellow） River, urban expansion, wide cultivation of rice, and rapid development of fishery. Among them human activities were the main driving factors for wetland landscape changes.

关键词： wetland landscape pattern landscape dynamics Kaifeng City

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Functionalized metal-organic frameworks with strong acidity and hydrophobicity as an efficient catalyst for the production of 5-hydroxymethylfurfural

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Chinese Journal of Chemical Engineering 2021年第5期34卷 167-174页

作者： Huan Li Yao Zhong Luxi Wang Qiang Deng Jun Wang Zheling Zeng xinxiang cao Shuguang Deng Key Laboratory of Poyang Lake Environment and Resource Utilization(Nanchang University)of the Ministry of Education School of ResourceEnvironmental and ChemicalEngineeringNanchang UniversityNanchang 330031China Laboratory for Development&Application of Cold Plasma Technology College of Chemistry and Chemical EngineeringLuoyang Normal UniversityLuoyang 471022China School for Engineering of Matter Transport and EnergyArizona State University551 E.Tyler MallTempeAZ 85287United States

In the dehydration of fructose to 5-hydroxymethyl furfural(HMF),in situ produced water weakens the acid strength of the catalyst and causes the rehydration of HMF,causing unsatisfactory catalytic activity and *** this work,a class of benzenesulfonic acid-grafted metal-organic frameworks with strong acidity and hydrophobicity is obtained by the direct sulfonation method using 4-chlorobenzenesulfonic acid as sulfonating *** resultant MOFs have a specific surface area of greater than 250 m^(2)·g^(-1),acid density above 1.0 mmol·g^(-1),and water contact angle up to 129°.The hydrophobic MOF-PhSO_(3)H exhibits both higher catalytic activity and selectivity than MOF-SO_(3)H in the HMF synthesis due to its better hydrophobicity and ***,the catalyst has a high recycled *** last,fructose is completely converted,and 98.0%yield of HMF is obtained under 120℃ in a DMSO solvent *** successful preparation of the hydrophobic acidic MOF provides a novel hydrophobic catalyst for the synthesis of HMF.

关键词： Catalysis Catalyst Biomass Metal-organic framework Fructose 5-Hydroxymethylfurfural

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Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene

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Frontiers of Chemical Science and Engineering 2015年第4期9卷 442-449页

作者： xinxiang cao Arash Mirjalili James Wheeler Wentao Xie Ben W.-L. Jang Department of Chemistry Texas A&M University-Commerce Commerce TX 75429-3011 USA

Galvanic replacement, co-impregnation and sequential impregnation have been employed to prepare Pd-Cu bimetallic catalysts with less than 1 wt-% Cu and ca. 0.03 wt-% Pd for selective hydrogenation of acetylene in excess ethylene. High angle annular dark field-scanning transmission electron microscopy （HAADF-STEM） and H2 chemisorption results confirmed that Pd-Cu singleatom alloy structures were constructed in all three bimetallic catalysts. Catalytic tests indicated that when the conversion of acetylene was above 99%, the selectivity of ethylene of these three single atom alloy catalysts was still more than 73%. Furthermore, the single atom alloy catalyst prepared by sequential incipient wetness impregnation was found to have the best stability among the three procedures used.

关键词： palladium-copper bimetallic catalyst singleatom alloy acetylene hydrogenation HAADF-STEM H2pulse chemisorption

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Preparation and investigation of Pd doped Cu catalysts for selective hydrogenation of acetylene

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Frontiers of Chemical Science and Engineering 2020年第4期14卷 522-533页

作者： xinxiang cao Tengteng Lyu Wentao Xie Arash Mirjalili Adelaide Bradicich Ricky Huitema Ben W.-L.Jang Jong K.Keum Karren More Changjun Liu Xiaoliang Yan Department of Chemistry Texas A&M University-CommerceCommerceTX 75429-3011.USA Laboratory for Development&Application of Cold Plasma Technology College of Chemistry and Chemical EngineeringLuoyang Normnal UniversityLuoyang 471022China Collaborative Innovation Center of Chemical Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Center for Nanophase Materials Sciences and Chemical Science Division Oak Ridge National LaboratoryOak RidgeTN 37831USA College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024China

A series of PdCu bimetallic catalysts with low Cu and Pd loadings and different Cu:Pd atomic ratios were prepared by conventionally sequential impregnation(CSD)and modified sequential impregnation(MSI)of Cu and Pd for selective hydrogenation of *** indicates that the supported copper(I)nitrate in the PdCu bimetallic catalysts prepared by MSI can be directly reduced to Cu metal particles due to the hydrogen spillover from Pd to Cu(NO3)2 *** addition,for the catalysts prepared by MSI,Pd atoms can form PdCu alloy on the surface of metal particles,however,for the catalysts prepared by CSI,Pd tends to migrate and exist below the surface layer of *** results indicate that compared with CSI,the MSI method enables samples to possess preferable stability as well as comparable reaction *** should be due to the MSI method in favor of the formation of PdCu alloy on the surface of metal ***,even Pd loading is super low,<0.045 wt-%in this study,by through adjusting Cu loading to an appropriate value,attractive reactivity and selectivity still can be achieved.

关键词： copper palladium catalysts acetylene selec-tive hydrogenation

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发展我国城市夜间旅游的对策研究

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经济问题探索 2008年第8期 125-128页

作者：曹新向河南大学黄河文明与可持续发展研究中心河南大学旅游学系河南开封475001

夜间旅游作为一项休闲活动已经成为现代城市旅游的一个重要组成部分。本文分析了城市夜间旅游产生的背景以及发展夜间旅游的意义,总结了城市夜间旅游发展现状以及目前的四种产品开发模式,提出了发展城市夜间旅游的一些对策。

关键词：夜间旅游模式对策城市

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基于模糊数学的城市旅游环境质量综合评判及其优化研究——以开封市为例

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南开管理评论 2005年第4期8卷 22-27页

作者：曹新向河南大学黄河文明与可持续发展研究中心

如何对城市旅游环境质量进行全面、有效的评价是城市旅游环境研究中的首要问题。本文以开封市为例,通过征求相关专家意见,并结合有关研究,构建了一个由旅游地资源环境、旅游地自然生态环境、旅游地社会服务环境和旅游地信息环境组成的... 详细信息

如何对城市旅游环境质量进行全面、有效的评价是城市旅游环境研究中的首要问题。本文以开封市为例,通过征求相关专家意见,并结合有关研究,构建了一个由旅游地资源环境、旅游地自然生态环境、旅游地社会服务环境和旅游地信息环境组成的城市旅游环境质量评价指标体系,采用模糊综合评判的方法,对开封市旅游环境质量进行了定量的评价。研究结果表明,开封市旅游环境总体质量较好,旅游资源环境和信息环境相对较差,旅游环境承载力的合理性最佳,旅游宣传促销力度、旅游信息网络建设程度最差,旅游自然生态环境各要素也较差。其优化的途径包括实施景观生态工程、加强宣传促销、开发自然旅游资源等。

关键词：旅游环境环境质量城市评判开封市旅游环境质量模糊综合评判城市旅游优化研究模糊数学

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Landscape pattern dynamics of water body in Kaifeng city in the 20th century

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Journal of Geographical Sciences 2005年第1期15卷 106-114页

作者： caoxinxiang DINGShengyan ResearchInstituteofYellowRiverCultureandSustainableDevelopment HenanUniversityKaifeng475001China／／CollegeofHistoryandCultureHenanUniversityKaifeng475001China CollegeofEnvironmentandPlanning HenanUniversityKaifeng475001China

Landscape spatial pattern mainly refers to the distribution of patches, which are different in size and shape in space owing to the interaction of various ecological activities. In landscape ecology study, landscape pattern has been one of the key study areas. Water body landscape plays an important role in the development history of a city, but at present city water body landscape in many cities has been destroyed, hence protecting water body in the city is becoming more and more important. In order to protect city water body landscape reasonably, the precondition is to probe the dynamics of water body landscape. Based on historical data and remote sensing data, six indexes including patch number, patch area, landscape dominance index, fractal dimension, patch density and connectivity index etc. were used to analyze landscape pattern dynamics of water body in Kaifeng city since the end of the Qing Dynasty (in the 20th century). The results showed: (1) Since the end of the Qing Dynasty, landscape area of water body in Kaifeng city increased first and then decreased from 1898 to 2002AD; the landscape dominant degree had the same changing tendency with the area. (2) Patch number of water body landscape in Kaifeng city had an increase from 1898 to 2002, but maximum area of patch, minimum area of patch and average area of patch decreased, which resulted in an increase in landscape fragment degree. (3) Connectivity index decreased and fractal dimension increased from 1898 to 2002. The reasons for these changes were the repeated overflows and flooding of the Yellow River and the influence of human activities.

关键词： landscape pattern water body dynamics Kaifeng city the early 20th century

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Prediction of the Interaction Parameter by the Solubility Parameter for Polyglycolic Acid

Prediction of the Interaction Parameter by the Solubility Pa...

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河南省化学会2016年学术年会

作者： Siye Tang Feng Liu Ye Wang xinxiang cao Baoming Ji College of Chemistry and Chemical Engineering and Henan Key Laboratory of Function-Oriented Porous Materials Luoyang Normal College

The solvency power of polyglycolic acid was studied using 36 solvents. The Hansen three-dimensional solubility parameters and total parameter of polyglycolic acid were obtained by an optimization *** values of δ, δ, δ and δ for polyglycolic acid were obtained as 17.35(MPa)1/2, 8.66(MPa)1/2, 9.87(MPa)1/2 and 21.76(MPa)1/2. The optimization method is superior to the traditional experimental method because it considers the nonsolvent data also as a part of the procedure. The values of the interaction parameter and the solubility parameter "distance" between polyglycolic acid and 36 solvents have been calculated. The results of the interaction parameters accord well with the standard of complete miscibility suggested by Flory–Huggins. For the commercial polyglycolic acid used in this paper, all the data are reported for the first time.

关键词： polyglycolic acid solubility parameters interaction parameter

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