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Production of biomass-derived monomers through catalytic conversion of furfural and hydroxymethylfurfural

Green Chemical Engineering 2021年第2期2卷 158-173页

作者： hirong yang Jing Zhang Gang Qian Xuezhi Duan Xinggui Zhou State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai200237China

The synthesis of biomass-derived monomers has received great attention in recent years,motivated by the depletion of fossil fuels and environmental ***,the intrinsic functionality within the biomass or biomass-derived chemicals has great potential to produce new types of monomers containing multiple acid or alcohol groups,thereby leading to materials with novel *** their versatile functional groups and easy production from cellulose/hemicellulose,furfural and hydroxymethylfurfural were regarded as very important biomass-derived platform chemicals through which multiple monomers can be produced via heterogeneous *** the current review,recent development in heterogeneous catalysis for the production of 6 bio-based monomers,furfuryl alcohol,2,5-bis(hydroxymethyl)furan,2,5-bis-(hydroxymethyl)tetrahydrofuran,1,5-pentanediol,1,6-hexanediol,and 2,5-furandicarboxylic acid,from furfural and hydroxymethylfurfural is reviewed and *** major challenge is how to efficiently and selectively convert specific functional group(s)in furfural and hydroxymethylfurfural during the production of these ***,catalyst stability issues need to be addressed due to necessity of using hot water as reaction medium and high tendency of carbonaceous deposit formation on catalyst *** current review mainly focuses on efforts of catalytic site design and modification,including selection of metal/support,use of synergy between metal and support,tuning metal size,use of inverse catalysts,adding catalytic promoters,constructing bimetallic sites,etc.,to realize efficient,selective and stable production of bio-based monomers from furfural and hydroxymethylfurfural.

关键词： Biomass-derived monomers Catalyst design Furfural Hydroxymethylfurfural Heterogeneous catalysis

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Deposition and Properties of CrN_x films by High Power Pulsed Unbalanced Magnetron Sputtering

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稀有金属材料与工程 2011年第S4期40卷 160-163页

作者： Mu Xiaodong,Mu Zongxin,Wang Chun,Jia Li,Zang hirong,Liu Bingbing,Dong Chuang Key Laboratory of Materials Modification by Laser,Ion and Electron Beams (Dalian University of Technology),Ministry of Education,School of Physics and Optoelectronic Technology,Dalian University of Technology,Dalian 116024,China Dalian Univ Technol Sch Phys & Optoelect Technol Minist Educ Key Lab Mat Modificat Laser Ion & Electron Beams Dalian 116024 Peoples R China

High-power pulsed magnetron sputtering (HPPMS) technology has drawn extensively attention for producing ultra-high dense plasma and high ionization fractions of the sputtered species,depositing dense films with high *** films were deposited on the substrates of Si(100) using high-power pulsed unbalanced magnetron sputtering (HPPUMS) technology,and the analyses of XRD and atomic force microscope (AFM) were conducted on the properties of microstructure and surface morphology of CrNx films;the friction coefficient and the adhesion between CrNx film and substrate were measured,*** was found HPPUMS discharge is able to deposit CrNx films with super comprehensive properties:higher adhesive strength between the film and substrate and lower coefficient of *** rate of CrNx films,which was tested by interferometry,was about 4.2nm/min at 0.6Pa and the pulse power density up to 6.8kW/cm2 with the pulse repetition frequency of 0.7Hz,which is about 56% of that provided by the mid-frequency magnetron sputtering discharge under the conditions of the same average power ***,clusters with a dimension of several hundred nanometers were observed on the AFM morphology probably related to high pulse current.

关键词： plasma sources plasma-based ion implantation and deposition thin film structure and morphology deposition by sputtering

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改进代价计算的AD-Census立体匹配算法

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测绘地理信息 2024年第1期49卷 138-142页

作者：胡璕叶世榕余振宝黄亮广州市城市规划勘测设计研究院广东广州510060 武汉大学卫星导航定位技术研究中心湖北武汉430079 中国民航科学技术研究院北京100028

针对现有AD-Census代价计算时,Census变换依赖中心像素,对场景光照、亮度敏感的问题,提出一种基于子区域均匀度变换的改进代价计算方法。对Middlebury数据集在无幅度失真、不同亮度、不同光照场景下的代价计算以及立体匹配实验的统计结... 详细信息

针对现有AD-Census代价计算时,Census变换依赖中心像素,对场景光照、亮度敏感的问题,提出一种基于子区域均匀度变换的改进代价计算方法。对Middlebury数据集在无幅度失真、不同亮度、不同光照场景下的代价计算以及立体匹配实验的统计结果表明,改进后的算法在非遮挡区以及所有区域的误匹配率均低于改进前,在代价计算环节,整体区域平均降低了5.80%,最终立体匹配后的视差图平均降低了1.55%。改进后的算法在不同亮度以及不同光照场景下对匹配的精度提升更加地显著,验证了改进算法的有效性。

关键词： Census变换子区域均匀度改进代价计算立体匹配

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