检索结果-南通市图书馆

Properties of Cementitious Rendering Mortar Prepared with Recycled Fine Aggregates

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2010年第6期25卷 1053-1056页

作者：潘智生 Department of Civil and Structural Engineering The Hong Kong Polytechnic University

The results of an experimental study on investigating the properties of cementitious rendering mortars prepared with a recycled fine aggregate（RA） were *** RA was obtained from a recycling plant in which mixed demolition wastes were processed by mechanical crushing,sieving and sorting *** series of rendering mortar mixes were prepared with a constant water/cement and a constant aggregate/cement ratios of 0.55 and 3 *** sand and natural crushed rock fine were originally used in the two series separately,and they were consistently replaced by 25%,50%,75% and 100% by the recycled *** experimental results showed that mechanical properties,such as compressive strength,flexural strength and modulus of elasticity of the mortars prepared with the RA were lower than the mortars made with the natural ***,the bond strength at the interface between the mortar and masonry bricks determined by the Triplet test was found to be higher for the mortars prepared with the RA.

关键词： rendering mortar recycled fine aggregate triplet test mechanical properties

Pore Size Distribution of High Performance Metakaolin Concrete

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2002年第1期17卷 42-46页

作者： C.S.poon S.C.kou L.Lam Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China

The Compressive strength, porosity and pore size distribution of high performance metakaolin (MK) concrete were investigated. Concretes containing 0,5% , 10% and 20% metakaolin were prepared at a water / cementitious material ratio ( W/C) of 0. 30. In parallel, concrete mixtures with the replacement of cement by 20% fly ash or 5 and 10% silica fume were prepared for comparison. The specimens were cured in water at 27℃ for 3 to 90 days. The results show that at the early age of curing (3 days and 7 days), metakaolin replacements increase the compressive strength, but silica fume replacement slightly reduces the compressive strength. At the age of and after 28 days , the compressive strength of the concrete with metakaolin and silica fume replacement increases. A strong reduction in the total porosity and average pore diameter were observed in the concrete with MK 20% and 10% in the first 7 days.

关键词： high performance concrete metakaolin pore size distribution

在线全文

学校读者我要写书评

暂无评论

重金属在废弃粉煤灰-水泥固化体系内的迁移

武汉理工大学学报 2005年第10期27卷 11-14页

作者：乔秀臣林宗寿寇世聪潘智生武汉理工大学硅酸盐材料工程教育部重点实验室武汉430070 武汉理工大学材料科学与工程学院武汉430070 香港理工大学土木系

采用径向动态浸出实验(r-DLT)研究了含废弃粉煤灰-水泥固化/稳定样品内部重金属铅、铜、锌的氢氧化物的迁移行为,发现重金属在酸溶液作用下虽然会从样品内部向外迁移,但不同重金属的迁移规律各不相同。其中铅会在靠近固液界面的区域富... 详细信息

采用径向动态浸出实验(r-DLT)研究了含废弃粉煤灰-水泥固化/稳定样品内部重金属铅、铜、锌的氢氧化物的迁移行为,发现重金属在酸溶液作用下虽然会从样品内部向外迁移,但不同重金属的迁移规律各不相同。其中铅会在靠近固液界面的区域富集而不会及时进入外界浸出液,铜的富集区域远大于铅,锌基本不会富集而被直接浸出。在固化/稳定体系中添加Ca(OH)2可以有效阻碍锌的浸出。

关键词：废弃粉煤灰固化稳定浸出 DLT

废弃粗粉煤灰-水泥系统固化重金属废弃物的探讨

在线全文

学校读者我要写书评

暂无评论

武汉理工大学学报 2005年第3期27卷 23-26页

作者：乔秀臣林宗寿寇世聪潘智生武汉理工大学材料科学与工程学院武汉430070 香港理工大学土木结构工程系

利用强度发展、毒性浸出试验(TCLP)和动态浸出试验(DLT)等手段探讨了废弃粗粉煤灰水泥系统固化/稳定含铅、铜和锌的重金属废弃物的可能性。研究发现废弃粗粉煤灰水泥系统养护28d后符合固化/稳定的指标要求,而且长期效果优于细粉煤灰水... 详细信息

利用强度发展、毒性浸出试验(TCLP)和动态浸出试验(DLT)等手段探讨了废弃粗粉煤灰水泥系统固化/稳定含铅、铜和锌的重金属废弃物的可能性。研究发现废弃粗粉煤灰水泥系统养护28d后符合固化/稳定的指标要求,而且长期效果优于细粉煤灰水泥系统。另外试验还发现,固化/稳定系统的酸中和能力是决定样品中重金属浸出能力的主要指标。

关键词：粗粉煤灰固化稳定含重金属废弃物

在线全文

学校读者我要写书评

暂无评论

香港建筑废物再生骨料混凝土的研究进展

青岛理工大学学报 2009年第4期30卷 17-23页

作者：潘智生寇世聪香港理工大学土木及结构工程系

减少,回收和再利用各种废物是当今世界可持续发展的战略之一.香港的建筑工业每天都要产生大量的建筑废物,处理和管理这些建筑废物已经成为严重的社会问题和环境问题.随着经济的快速增长,国内的一些大城市中建筑废物的处理和管理同样成... 详细信息

减少,回收和再利用各种废物是当今世界可持续发展的战略之一.香港的建筑工业每天都要产生大量的建筑废物,处理和管理这些建筑废物已经成为严重的社会问题和环境问题.随着经济的快速增长,国内的一些大城市中建筑废物的处理和管理同样成为主要的环境和社会问题之一.回收和再利用建筑废物,不仅可以节约处理建筑废物的土地,减少管理和处理建筑废物的成本,而且可以节约大量的自然资源.香港政府已经建立了回收和筛选建筑废物的设施.香港理工大学在回收和再利用建筑废物领域开展了近十年的研究工作,取得了一定的成果并向香港政府推荐了再生骨料回收再利用的规范.笔者介绍香港理工大学在研究建筑废物再生骨料混凝土方面取得的成果,包括建筑废物再生骨料环保砖、粉煤灰再生骨料混凝土、蒸汽养护再生骨料混凝土等.并介绍再生骨料混凝土在香港湿地公园的应用情况.这些技术成果将对回收和利用建筑废物起到促进作用.

关键词：建筑废物再生骨料混凝土研究进展

在线全文

学校读者我要写书评

暂无评论

建筑废物可持续循环利用的新技术

武汉理工大学学报 2007年第1期29卷 8-11,21页

作者：潘智生寇世聪香港理工大学土木及结构工程系

按照减少、回收和再利用建筑废物的原则,介绍在建筑物拆迁和建筑工地上减少建筑废物以及可持续循环再利用建筑废物的的新技术。这些技术包括:建筑物的选择性拆除;利用建筑废物生产的循环再生骨料制造结构混凝土和非结构混凝土。由于再... 详细信息

按照减少、回收和再利用建筑废物的原则,介绍在建筑物拆迁和建筑工地上减少建筑废物以及可持续循环再利用建筑废物的的新技术。这些技术包括:建筑物的选择性拆除;利用建筑废物生产的循环再生骨料制造结构混凝土和非结构混凝土。由于再生骨料强度低,多孔和吸水率高,给其在混凝土中大量应用带来了混凝土强度低,干缩和蠕变增加的问题。很多欧美国家规定结构混凝土中建筑废物再生骨料的含量不能超过粗骨料含量的20%。而利用这些新技术后,可以在建筑物拆迁过程中和建筑工地上减少废物;非结构混凝土中,再生骨料的含量可以达100%。结构混凝土中,建筑废物再生骨料的含量可以超过粗骨料含量的50%。

关键词：再生骨料建筑废物循环利用

The Use of a High Frequency Linear Transducer in the Assessment of Fetal Anatomy at the Routine 11 to 13 + 6-Week Scan among chinese Population

在线全文

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2015年第10期5卷 553-563页

作者： Shui Lam Mak Kam On kou Chung Fan poon Wei Ling Teresa Ma Kwok Yin Leung Department of Obstetrics and Gynaecology Queen Elizabeth Hospital Hong Kong China

Objectives: To determine if the use of high frequency linear transducer (HFLT) in addition to conventional curvilinear transducer (CCT) aids assessment of fetal cardiac and non-cardiac anatomy in the first trimester. Methods: Transabdominal CCT (4 - 8 MHz) followed by HFLT (9 MHz) was used to study prospectively the visualization rate of basic and optional anatomical structures according to international guidelines. McNemar and chi-square test were used to compare correlated and independent proportions respectively. Postnatal outcomes were traced. Results: Comparing with CCT alone, additional use of HFLT did not improve the completion rate of basic anomaly screen (95.0% vs. 97.0%, p = 0.5) in the 101 women studied, but it improved the visualization rate of some optional structures including lens (57.4% vs. 73.3%), three-vessel view (3 VV) (17.8% vs. 48.5%), left ventricular outflow tract (17.8% vs. 51.5%), kidneys (8.9% vs. 47.5%), and umbilical artery (86.1% vs. 93.1%) (all p chieve a high visualisation rate of different cardiac views in the first trimester.

关键词： Ultrasonography First-Trimester Transducter Fetal Anatomy

Simultaneous dual-contrast three-dimensional imaging in live cells via optical diffraction tomography and fluorescence

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2019年第9期7卷 1042-1050页

作者： CHEN LIU MICHAEL MALEK IVAN poon LANZHOU JIANG ARIF MSIDDIQUEE COLIN JRSHEPPARD ANN ROBERTS HARRY QUINEY DOUGUO ZHANG XIAOcong YUAN JIAO LIN CHRISTIAN DEPEURSINGE PIERRE MARQUET SHAN SHAN kou Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen518060China Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVictoria3086Australia Department of Optics and Optical Engineering Anhui Key Laboratory of Optoelectronic Science and TechnologyUniversity of Science andTechnology of ChinaHefei230026China Department of Biochemistry and Genetics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVictoria3086Australia Australian Research Council(ARC) Centre of Excellence in Advanced Molecular ImagingAustralia Istituto Italiano di Tecnologia Genova16163Italy School of Physics University of MelbourneVictoria3010Australia School of Engineering RMIT UniversityMelbourneVictoria3001Australia Microvision and Microdiagnostic Group(SCI STI CHD) Ecole Polytechnique Federale de Lausanne(EPFL)1015LausanneSwitzerland Laboratory for Cellular Imaging and Energetics Biological and Environmental Sciences and Engineering DivisionKing Abdullah University ofScience and Technology(KAUST)Thuwal23955-6900Saudi Arabia Joint International Research Unit in Neurodevelopment and child Psychiatry CHUVDepartement de PsychiatrieLausanneSwitzerlandUniversiteLavalQuebecCanada Institut universitaire en santementale de Quebec QuebecCanada Centre d’optique photonique et laserDepartment of Psychiatry and NeuroscienceUniversiteLaval2375rue de la TerrasseQuebecQC G1V0A6Canada

We report a dual-contrast method of simultaneously measuring and visualizing the volumetric structural information in live biological samples in three-dimensional(3D) space. By introducing a direct way of deriving the 3D scattering potential of the object from the synthesized angular spectra, we obtain the quantitative subcellular morphology in refractive indices(RIs) side-by-side with its fluorescence signals. The additional contrast in RI complements the fluorescent signal, providing additional information of the targeted zones. The simultaneous dual-contrast 3D mechanism unveiled interesting information inaccessible with previous methods, as we demonstrated in the human immune cell(T cell) experiment. Further validation has been demonstrated using a Monte Carlo model.

关键词： Fourier red Carlo Monte image Simultaneous dual-contrast three-dimensional imaging in live cells via optical diffraction tomography and fluorescence

在线全文

学校读者我要写书评

暂无评论

用碱式硫酸盐激发废弃粗粉煤灰的研究

武汉理工大学学报 2004年第6期26卷 8-10,14页

作者：乔秀臣林宗寿寇世聪潘智生武汉理工大学材料科学与工程学院武汉430070 香港理工大学土木结构工程系

通过研究碱式硫酸盐对废弃粗粉煤灰 -水泥系统的强度发展、水化程度及样品孔隙率等的影响 ,发现掺入Na2 SO4 和 K2 SO4 可以大幅提高废弃粗粉煤灰 -水泥系统在早期和晚期的抗压强度 ,在试验条件下 ,掺 Na2 SO4 的最佳掺量为总重量的 6 %... 详细信息

通过研究碱式硫酸盐对废弃粗粉煤灰 -水泥系统的强度发展、水化程度及样品孔隙率等的影响 ,发现掺入Na2 SO4 和 K2 SO4 可以大幅提高废弃粗粉煤灰 -水泥系统在早期和晚期的抗压强度 ,在试验条件下 ,掺 Na2 SO4 的最佳掺量为总重量的 6 % ,K2 SO4 的最佳掺量为总重量的 4 % ,这些最优掺量都与激发剂的溶解度有关。抗压强度的结果显示 ,在养护后期 Na2 SO4 对强度发展的促进作用要优于 K2 SO4 。水化程度测试的结果则表明 ,在早期碱式硫酸盐作用下大量溶解的废弃粗粉煤灰中的活性成分 ,要在后期才能够完全参与火山灰反应。

关键词：粗粉煤灰火山灰活性水化程度化学激发硫酸盐激发