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| 1 | 开裂混凝土中水分侵入过程的可视化追踪及其特征分析显示文摘采用热中子辐射成像技术,对开裂混凝土中的水分侵入过程进行了试验研究与特征分析。结果表明:中子成像能够突破混凝土材料的非透明性局限,实现对开裂混凝土中水分侵入过程的可视化追踪和水分空间分布的定量计算;水分在开裂混凝土中不仅由与水初始接触面沿垂直方向推进,而且还沿裂缝两侧向其水平方向,以及钢筋与水泥基体界面外围方向同时入侵;裂缝区和钢筋与水泥基体界面区成为水分持续侵入的二次水源;水分侵入初期约2h内,根据试验中裂缝宽度为0.35mm试件的中子图像估算的水分侵入量与称量法测得的水分侵入量基本一致。 | 张鹏 赵铁军 WITTMANN F H LEHMANN E 金祖权 VONTOBEL P | 2010 | 硅酸盐学报2010，38，4： | 8 |
| 2 | Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography:Theoretical analysis and experimental study显示文摘Water movement in porous cement-based materials is of great importance when studying their deterioration processes and durability.Many traditional methods based on mass changes,electricity or nuclear magnetic resonances are available for studying water transport in cement-based materials.In this research,an advanced technique i.e.thermal neutron radiography was utilized to achieve visualization and quantification of time dependent water movement including water penetration and moisture vapor in porous cement-based materials through theoretical analysis and experimental study.Because thermal neutrons ex-perience a strong attenuation by hydrogen,neutron radiography exhibits high sensitivity to small amounts of water.A neutron transmission analysis for quantitative evaluation of raw radiographic measurements was developed and optimized based on point scattered functions(PScF).The determinations of the real time and space dependent water penetration into uncracked and cracked mortar samples,as well as the drying process have been presented in this paper.It is illustrated that thermal neutron radiography can be a useful research tool for visualization and quantification of water movement in porous building materials.The obtained results will help us to better understand deteriorating processes of cement-based materials and to find ways to improve their durability. | ZHANG Peng1,WITTMANN F H1,2,ZHAO TieJun1,LEHMANN E3 & JIN ZuQuan1 1 Center for Durability & Sustainability Studies of Shandong Province,Qingdao Technological University,Qingdao 266033,China 2 Aedificat Institute Freiburg,Freiburg D-79100,Germany 3 Department of Spallation Neutron Source(ASQ),Paul Scherrer Institute,Villigen PSI CH-5232,Switzerland | 2010 | Science China(Technological Sciences)2010，53，5： | 6 |
| 3 | Assessing hydrological and provisioning ecosystem services in a case study in Western Central Brazil显示文摘Introduction:Current land use in the Federal District,Western Central Brazil,causes problems related to the water supply which are linked to the regulation of ecosystem services(ES).In scope of an Integrated Water Resources Management concept,we further developed the web-based planning support tool GISCAME for the Pipiripau river basin case study.Methods:We introduced analyses on ecosystem potentials in the raster-based tool to assess,in a spatially explicit manner,the scenario impact on water purification,sediment retention,water retention,and provision of food and fodder in order to identify potential pathways for conserving water resources.To demonstrate the method,we assess ES depending on a number of land use/land cover change(LULCC)scenarios.Results:We found that a considerable increase of water purification and sediment retention is difficult to achieve with realistic small scale LULCC,mainly because in areas with a low potential to provide hydrological ES and thus with a high demand for sustainable land use,such as native Savanna(Cerrado)and natural forests(Mata),favorable land uses were often already existing.We observed synergies in the response of regulating hydrological ES to LULCC but at the same time also trade-offs with provision of food and fodder.Conclusions:Our findings suggest that further degradation and loss of Cerrado and Mata must be avoided and their restoration should be promoted in order to safeguard water resources.We suggest that restoration measures should be focused on arable land located at steep slopes near surface waters to effectively increase hydrological ES through the marginal reduction of provision services. | Lars Koschke Carsten Lorz Christine Fürst Tobias Lehmann Franz Makeschin | 2014 | Ecological Processes2014，3，1： | 2 |
| 4 | Nerolidol derivatives from Asteriscus sericeus 显示文摘 | Jakupovic J Lehmann L Bohlmann F | 1987 | Phytochemistry1987，26，10： | 2 |
| 5 | Biologically and chemically optimised composites of carbonated apatite and polyglycolide as bone substitution materials显示文摘 | Linhart W Peters F Lehmann W | 2001 | J Biomed Mater Res2001，54，： | 1 |
| 6 | Effect of hysteresis on water flow in a sand column with a fluctuating capillary fringe显示文摘 | Lehmann P Stauffer F Hinz C | 1998 | Journal of Contaminant Hydrology1998，33，： | 1 |
| 7 | Wing Rotation and the Aerodynamic Basis of Insect Flight显示文摘 | Dickinson M H Lehmann F O Sanjay P S | 1999 | Science1999，，284： | 1 |
| 8 | A triadic approach to formal concept analysis显示文摘 | LEHMANN F WILLE R | 1995 | Lecture Notes in Computer Science1995，954，： | 1 |
| 9 | Durability of the resin bond strength to zirconia ceramic after using different surface conditioning methods显示文摘 | Wolfart M Lehmann F Wolfart S | 2007 | Dent Mater2007，23，1： | 1 |
| 10 | Slowly digestible starch-its structure and health implications: a review 显示文摘 | Lehmann U Robin F | 2007 | Trends Food Sci Technol2007，18，7： | 1 |
| 11 | Fracture resistance of metal-free composite crowns-effects of fiber reinforcement,thermal cycling,and cementation technique显示文摘 | Lehmann F Eickemeyer G Rammelsberg P | 2004 | J Prosthet Dent2004，92，3： | 1 |
| 12 | A new treatment option for chronic cancer pain显示文摘 | Zech D F Lehmann K A Grond S A | 1994 | Eur J Pain Cure1994，1，1： | 1 |
| 13 | Wing rotation and the aerodynamic basis of insect flight 显示文摘 | Dickinson M H Lehmann F O Sane S | 1999 | Science1999，284，5422： | 1 |
| 14 | Slowly digestible starch-its structure and health implications:a review显示文摘 | Lehmann U Robin F | 2007 | Trends Food Sci Tech2007，18，： | 1 |
| 15 | Preservation of organic matter and alteration of its carbon and nitrogen isotope composition during simulated and in situ early sedimentary diagenesis 显示文摘 | Lehmann M F Bernasconi S M Barbieri A | 2002 | Geochimica et Cosmochimica Acta2002，66，20： | 1 |
| 16 | Influence of surface conditioning and cleaning methods on resin bonding to zirconia ceramic显示文摘 | Attia A Lehmann F Kern M | 2011 | Dent Mater2011，27，3： | 1 |
| 17 | Quantitative assessment of promoter hypermethylation during breast cancer development显示文摘 | Lehmann U Langer F Feist H | 2002 | Am J Pathol2002，160，2： | 1 |
| 18 | Durability of the resin bond strength to zirconia ceramic after using different surface conditioning methods显示文摘 | Wolfart M Lehmann F Wolfart S | 2007 | Dent Mater2007，23，1： | 1 |
| 19 | Submicroscopic duplication in Xq28 causes increased expression of the MECP2 gene in a boy with severe mental retardation and features of Rett syndrome 显示文摘 | Meins M Lehmann J Gerresheim F | 2005 | J Med Genet2005，42，2： | 1 |
| 20 | Characterization of an antigen that is recognized on a melanoma showing partial HLA loss by CTL expressing an NK inhibitory receptor显示文摘 | Ikeda H Lethe B Lehmann F | 1997 | Immunity1997，6，2： | 1 |
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