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Recent studies on mechanical properties of recycled aggregate concrete in China-A review

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Science China(Technological Sciences) 2012年第6期55卷 1463-1480页

作者： XIAO JianZhuang LI WenGui POON ChiSun Department of Building Engineering Tongji UniversityShanghai 200092China Department of Civil and Structural Engineering Hong Kong Polytechnic UniversityHong KongChina committee of recycled aggregate concrete Civil Engineering SocietyShanghai 200092China

Numerous experimental and theoretical studies on recycled aggregate concrete have been carried out in China in the past 10 *** paper provides a comprehensive review of the related findings of research on the mechanical properties of RAC in *** influences of the RCA on the strength and deformation characteristics of concrete,the statistical characteristics for the strength of RAC,fracture energy,stress-strain relationships under uniaxial compression,uniaxial tension as well as pure shear,and the residual strength of RAC after exposure to high temperatures,the bond between RAC and different kinds of steel rebar were also ***,some recent studies on the numerical simulation of the failure mechanism for RAC at the meso-structure level were discussed.

关键词：再生骨料混凝土力学性能审查残余强度 RAC 研究成果变形特性单轴压缩

Draft of Spanish Standard for the Use of recycled aggregate in the Production of Structural concrete

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Draft of Spanish Standard for the Use of Recycled Aggregate ...

Opening-up Policy of China under New Circumstances:Objectives,Challenges and Development Trends

The 6th International Symposium on Cement & concrete and Canmet/Aci International Symposium on concrete Technology for Sustainable Development

作者： Pilar Alaejos Marta Sánchez de Juan Marilda Barra Manuel Burón Enrique Dapena Miren Etxebarría Gilbert Francisco Belén González Fonteboa Fernando Martínez Abella Isabel Martínez Lage José Luis Parray Alfaro Juan Antonio Polanco Mariano Sanabria Enric Vázquez Task Force of Standing committee of concrete

In November 2002, the Spanish Standing committee of concrete created a task force commissioned to draft a document to complement current regulations on structural concrete and to set out specific reco

关键词： recycled concrete aggregate, Standardization, structural concrete.

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International Understanding 2015年第4期 39-43页

作者： Guo Wei Ma Jiatai Department of Economics Party School of the Central Committee of CPC

Since the implementation of the great strategic decision of reform and opening up made by the Third Plenary Session of the Eleventh Central committee of CPC,with more than 30 years’rapid development,China has made wo... 详细信息

关键词： acknowledged aggregate cooperation strategic globalization currency strive encourage circumstances indispensable

Organic near-infrared photodetectors with photoconductivityenhanced performance

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Aggregate

aggregate 2023年第5期4卷 120-127页

作者： Siwei Zhang Zhenlong Li Jingzhou Li Bingzhe Wang Fang Chen Xubiao Li Shunjie Liu Jacky W.Y.Lam Guichuan Xing Jiangyu Li Zheng Zhao Feiyu Kang Guodan Wei Ben Zhong Tang Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Guangdong-Hong Kong-Macro Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsThe Hong Kong University of Science and TechnologyKowloonHong KongChina Tsinghua-Berkeley Shenzhen Institute Institute of Materials ScienceTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacaoChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenChina Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchunChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenChina Center for Aggregation-Induced Emission South China University of TechnologyGuangzhouChina

Organic near-infrared(NIR)photodetectors with essential applications in medical diagnostics,night vision,remote sensing,and optical communications have attracted intensive research *** with most conventional inorganic counterparts,organic semiconductors usually have higher absorption coefficients,and their thin active layer could be sufficient to absorb most incident light for effective ***,due to the relatively poor charge mobility of organic materials,it remains challenging to inhibit the photogenerated exciton recombination and effectively extract carriers to their respective ***,this challenge was addressed by increasing matrix conductivities of a ternary active layer(D–A–D structure NIR absorber[2TT-oC6B]:poly(N,N′-bis-4-butylphenyl-N,N′-bisphenyl)benzidin[PolyTPD]:[6,6]-phenyl-C61-butyric acid methyl ester[PCBM]=1:1:1)upon in situ incident light illumination,significantly accelerating charge transport through percolated interpenetrating *** greatly enhanced photoconductivity under illumination is intrinsically related to the unique donor–acceptor molecular structures of PolyTPD and 2TT-oC6B,whereas stable intermolecular interaction has been verified by systematic molecular dynamics *** addition,an ultrafast charge transfer time of 0.56 ps from the NIR aggregation-induced luminogens of 2TT-oC6B absorber to PolyTPD and PCBM measured by femtosecond transient absorption spectroscopy is beneficial for effective exciton *** solution-processed organic NIR photodetector exhibits a fast response time of 83μs and a linear dynamic range value of 111 dB under illumination of 830 ***,our work has opened up a pioneering window to enhance photoconductivity through in situ photoirradiation and benefit NIR photodetectors as well as other optoelectronic devices.

关键词： AIEgens organic NIR photodetectors photoconductivity

How Far Is China’s Grain Subsidies Level from the Ceiling of Amber Box Support?-Evaluation Based on WTO Rules

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China Economist 2015年第6期10卷 44-55页

作者：朱满德程国强 School of Economics Guizhou University Guiyang China Academic committee of the Development Research Center of the State Council of China Beijing China

Using the aggregate measurement of support(AMS) approach of the World Trade Organization(WTO),this study estimates China s product-specific and non-productspecific amber box support levels between 2008 and *** result indicates that China s product-specific amber box support level has significantly increased but not yet exceeded the tolerable ceiling of de minimis and remains consistent with WTO rules on agricultural domestic support;that there is still policy room for product-specific amber box support but the ceiling of de minimis has already imposed substantial constraint on China's grain price support policies;and that despite rapid increases in non-product-specific amber box support levels,future policy space remains *** result also suggests that China should make appropriate adjustments to product-specific amber box support policies in accordance with WTO rules on agricultural domestic support and make proper use of nonproduct-specific amber box support policies.

关键词：世贸组织天花板中国琥珀盒子粮食水补贴

An Aggregation-Induced Emission Optical Highlighter for the Studies of Endoplasmic Reticulum-Lipid Droplet Content Dynamics

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CCS Chemistry 2022年第2期4卷 515-525页

作者： Engui Zhao Chuen Kam Ming-Yu Wu Erjing Wang Jiawei Wang Ben Zhong Tang Sijie Chen School of Science School of Electronics and Information EngineeringHarbin Institute of TechnologyShenzhenHIT Campus of University TownShenzhen 518055 Ming Wai Lau Centre for Reparative Medicine Karolinska InstitutetHong Kong 999077 Overseas Expertise Introduction Center for Discipline Innovation(D18025) Collaborative Innovation Center for Advanced Organic Chemical Materials Co-Constructed by the Province and MinistrySchool of Material Science and EngineeringHubei UniversityWuhan 430062 Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionSCUT-HKUST Joint Research InstituteInstitute for Advanced StudyDepartment of Chemical and Biological EngineeringThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077 Shenzhen Institute of Molecular aggregate Science and Engineering School of Science and EngineeringGuangdong of Electronic and Information EngineeringThe Chinese University of Hong KongShenzhen2001 Longxiang BoulevardLonggang DistrictShenzhen CityGuangdong 518172

The lipid droplet(LD)is a dynamic organelle responsible for lipid storage and metabolism that plays important roles in maintaining lipid ***,limited strategies are available for tracking the LD content *** this contribution,we report a novel fluorescent probe,TPEAmAl,for real-time LD content dynamics ***-AmAl is LD-specific,but emits faintly due to its intramolecular *** photoactivation,it undergoes a photocyclodehydrogenation reaction and shows a large fluorescence ***,it can be used for highlighting selected LDs with high spatial *** measuring the fluorescence changes in the distal region,the lipid content exchange efficiency can be *** our experiment,LD content exchange rate differences between nascent and mature LDs as well as cells with normal and deficient LD budding machinery are *** probe expands the fluorescence-based toolbox for LD content dynamics studies.

关键词： aggregation-induced emission lipid droplet-ER content dynamics optical highlighter photoactivation

Enzyme-free photothermally amplified fluorescent immunosorbent assay(PAFISA)for sensitive cytokine quantification

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Aggregate

aggregate 2023年第6期4卷 137-145页

作者： Dian Li Wei He Xuyan Lin Xiaodong Cui Stefan Nagl Angela Ruohao Wu Ryan T.K.Kwok Renhua Wu Ben Zhong Tang Department of Medical Imaging The 2nd Affiliated HospitalMedical CollegeShantou UniversityShantouP.R.China Department of Physics Shantou UniversityShantouP.R.China Department of Physics University of Hong KongHong Kong SARP.R.China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyKowloonP.R.China Division of Life Science The Hong Kong University of Science and TechnologyKowloonP.R.China HKUST Fok Ying Tung Research Institute GuangzhouP.R.China Department of Chemistry The Hong Kong University of Science and TechnologyKowloonP.R.China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyKowloonP.R.China School of Science and Engineering Shenzhen Key Laboratory of Functional Aggregate MaterialsThe Chinese University of Hong KongShenzhenP.R.China

Cytokine monitoring has attracted great attention due to its significance in the diagnosis and treatment of many diseases,such as tumors,microbial infections,and immunological ***-linked immunosorbent assay(ELISA)is one of the most popular methods in cytokine detection,ascribing to the lavish signal amplification methods in the ELISA *** addition to classical enzymes,other signal amplifiers such as fluorescent probes,artificial nano-enzymes,and photothermal reagents have been applied to reduce the detection limit and produce more sensitive ELISA *** to the accumulative effect of heat,photothermal reagents are promising materials in the signal amplification of ***,the lack of efficient photothermal generation material at an aggregate scale may delay the further development of this *** this contribution,based on an efficient organic photothermal aggregate material,an enzyme-free photothermally amplified fluorescent immunosorbent assay system consisting of an assay microfluidic chip and detecting platform was *** photothermal nanoparticles with highly efficient photothermal conversion by harvesting energy via excited-state intramolecular motions and enlarging molar absorptivity were successfully *** detection concentration at 50 pg/mL of interleukin-2 was achieved,realizing a signal improvement of detection limits by 20-fold compared to that of previously reported photothermal *** microscopic imaging integrated with plane sweeping technology provided high spatial resolution and precision,indicating the potential of achieving high throughput profiling at the ***,as an alternative excitation source,light-emitting diode not only provided a more affordable and miniaturized detection system but also revealed the great feasibility of intramolecular motion-induced photothermy nanoparticles for biological analyses.

关键词： cytokine quantitation enzyme free fluorescence intensity ratio metric interleukin-2 microchip microscopic mapping photothermally amplified fluorescent immunosorbent assay

Arbuscular Mycorrhizal Fungus Mediate Changes in Mycorrhizosphere Soil aggregates

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Agricultural Sciences 2015年第12期6卷 1455-1463页

作者： Tao Liang Xiaojun Shi Tao Guo Sili Peng College of Resources and Environment Southwest University Chongqing China The National Monitoring Base for Purple Soil Fertility and Fertilizer Efficiency Southwest University Chongqing China Beibei District Agricultural committee Chongqing China

Many studies have shown that arbuscular mycorrhizal (AM) fungus has an important role in soil aggregate formation and stabilization. While most studies about the effects of AM fungus on soil aggregate have experimental set-ups in single pots or containers with two compartments, these studies cannot differentiate the effects of roots, mycorrhizal roots or hyphae. In this study we used containers with four compartments to split the roots and quantitatively compare the change of soil aggregate in the mycorrhizosphere soil, rhizosphere soil, hyphosphere soil and bulk soil. Our results demonstrate a significant positive correlation among hyphal length density, easily extractable glomalin (EEG) and aggregate mean weight diameter (MWD), geometric mean diameter (GMD) and percentage of soil macroaggregate with a diameter larger than 0.25 mm (R0.25). The GMD and MWD of R0.25 in the hyphal compartment were higher than those in the non-inoculated root compartment, but were lower than those in the mycorrhizal compartment. This suggests the mycorrhizal hyphae had a greater effect than the non-inoculated roots, but less of an effect than the mycorrhizal roots on the formation and stabilization of soil aggregate. The results reveal that plant roots, mycorrhizal roots and mycorrhizal hyphae contribute to aggregate stability in individual ways and that their effects are additive, creating a synergistic stabilizing effect.

关键词： Hyphae Hyphosphere Mycorrhizae Rhizosphere Water Stable aggregate

Acid Resistance, Water Permeability and Chloride Penetrability of concrete Containing Crushed Basalt as aggregates

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材料科学与工程（中英文A版） 2015年第7期5卷 285-304页

作者： ArefM. al-Swaidani Mohammad K. Baddoura Samira D. Aliyan Walid Choeb Assistant professor & Vice-Dean Faculty of Architectural Engineering Arab International University (AIU) Damascus Syria Professor Head of Syrian Code Committee the Order of Syrian Engineers Damascus Syria Researcher Syrian Arab Organization for standardization and Metrology (SASMO) Damascus Syria Researcher & Consultant the Order of Syrian Engineers As-Swaida ' a Syria

Basaltic rocks are used extensively as engineering materials including aggregates for Portland cement concrete and asphalt concrete. Syria is very rich in Basaltic rocks. There are reserves estimated to be several billion tonnes according to recent geological investigations. The annual production of concrete in Syria is about 20 million m3, containing about 35 million tonnes of aggregates. Due to some concerns, use of basalt as concrete aggregate is very limited in Syria. Because of additional costs of transportation of dolomite aggregate produced in quarries located about 200 km far from the southern region, studying suitability of basaltic rocks occurring in As-Swaida"a region as local aggregate source would be very important. As-Swaida is basically an agricultural city. However, it has recently witnessed urban and industrial developments. This paper is part of larger research on evaluating the basaltic rocks extracted from As-Swaida"a region, as a potential source of concrete aggregate. Effects of aggressive acidic environments on concrete have been investigated through 3 months of exposure to 5% H2SO4, 10% HCl, 5% HNO3 and 10% CH3COOH solutions. In addition, concrete permeability measured in terms of water penetration depth was evaluated for concrete after two curing time of 28 and 90 days. A RCPT (Rapid chloride penetration test) has also been carried out according to ASTM C 1202. Dolomite aggregate were used for comparison. Petrographical, chemical and physical characteristics of basaltic rocks have been reported as well. The experimental results revealed that As-Swaida"a basaltic rocks were suitable for production of crushed rock aggregates for concrete production. The resistance to all acidic solutions, except H2SO4 solution, was improved substantially with the use of basalt aggregate. In addition, the resistance to water permeation and to chloride penetration of concrete increased with the use of basalt aggregates compared with dolomite aggregate. Moreover,

关键词：氯离子渗透性沥青混凝土玄武岩耐酸性混凝土骨料玄武质岩石水泥混凝土混凝土生产