检索结果-南通市图书馆

Living concrete with self-healing function on cracks attributed to inclusion of microorganisms: Theory, technology and engineering applications——A review

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2021年第10期64卷 2067-2083页

作者： QIAN ChunXiang ZHENG TianWen RUI YaFeng School of materials Science and Engineering Southeast UniversityNanjing 211189China Research Center of Green building&Construction materials Southeast UniversityNanjing 211189China key lab of Microbial Bio-mineralization Technology China Construction Materials IndustryNanjing 211189China Jiangsu key laboratory for Construction materials Southeast UniversityNanjing 211189China

Concrete is the most widely used composite material in civil *** induced calcium carbonate precipitation(MICP)is a green and environmental friendly technology,which has received extensive attention in repair of concrete *** paper introduces the research progress in Southeast University research in past 16 *** the early stage,MICP technology of urea hydrolyzed by Bacillus pasteurii was mainly investigated to repair the surface cracks and to fill large-size cracks with ***,aiming at the hidden cracks that were difficult for human intervention,a new mineralization route of Bacillus mucilaginosus was proposed,which could repair faster than Bacillus alcalophilus,and the problem of ammonia emission in the repair process of Bacillus pasteurii was also *** addition,in order to improve the protection of bacteria and the self-healing efficiency of the later age cracks,the methods of fiber immobilization,carrier uniformly immobilization and core-shell structural immobilization had been compared and *** results showed that core-shell structural immobilization had good protection ability and strong ***’s more,the paper also summarized the characteristics of spore germination,cell activity,nucleation and biological calcium carbonate in crack zone,and introduced the application experience of microbial self-healing concrete in water conservancy projects and subway stations.

关键词： living concrete self-healing crack microorganisms engineering application

Mechanism of Boron Oxide as a Phase Regulator for Modification of Manganese Slag

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) 2014年第1期29卷 89-92页

作者：陈平 LI Zhibo 刘荣进 XIANG Weiheng QI Aixiang College of materials Science and Engineering Guilin University of Technology key lab of New Processing Technology for Nonferrous Metals & materials Minstry of Education Guang Xi key laboratory of New Energy and building Energy Saving University of Science and Technology Beijing

The current research focused on adjusting the low hydration activity of the metallurgical slag by phase reconstruction technique. Boron oxide was used as a phase regulator to improve the amorphous phase composition of the manganese slag, consequently enhancing its hydraulic activity. The effects of boron oxide dosage and calcination temperature on the manganese slag amorphous phase content were investigated. XRD and DTG were performed to analyze the hydration mechanism of the manganese slag powder and cement. Results show that, when boron oxide dosage is 15%, calcination temperature is 1 300℃, and holding time for 1 hour, the amorphous content of the modified manganese slag reaches 95% and its 28-day activity index reaches 8 1.7%. The manganese slag powder can then be used as cement or concrete admixtures for the building materials industry.

关键词： boron oxide manganese slag amorphous content hydraulic activity

Simultaneous generation of electricity, ethylene and decomposition of nitrous oxide via protonic ceramic fuel cell membrane reactor

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第2期77卷 359-368,I0010页

作者： Song Lei Ao Wang Guowei Weng Ying Wu Jian Xue Haihui Wang Guangdong Provincial key lab of Green Chemical Product Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Beijing key laboratory for Membrane materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Chemical Engineering and Light industry Guangdong University of TechnologyGuangzhou 510006GuangdongChina

Ethylene,one of the most widely produced building blocks in the petrochemical industry,has received intense *** production,using electrochemical hydrogen pump-facilitated nonoxidative dehydrogenation of ethane(NDE)to ethylene,is an emerging and promising route,promoting the transformation of the ethylene industry from energy-intensive steam cracking process to new electrochemical membrane reactor *** this work,the NDE reaction is incorporated into a BaZr_(0.1)Ce_(0.7)Y_(0.1)Yb_(0.1)O_(3-δ)electrolyte-supported protonic ceramic fuel cell membrane reactor to co-generate electricity and ethylene,utilizing the Nb and Cu doped perovskite oxide Pr_(0.6)Sr_(0.4)Fe_(0.8)Nb_(0.1)Cu_(0.1)O_(3-δ)(PSFNCu)as anode catalytic *** to the doping of Nb and Cu,PSFNCu was endowed with high reduction tolerance and rich oxygen vacancies,showing excellent NDE catalytic *** maximum power density of the assembled reactor reaches 200 mW cm^(-2)at 750℃,with high ethane conversion(44.9%)and ethylene selectivity(92.7%).Moreover,the nitrous oxide decomposition was first coupled in the protonic ceramic fuel cell membrane reactor to consume the permeated *** a result,the generation of electricity,ethylene and decomposition of nitrous oxide can be simultaneously obtained by a single ***,the maximum power density of the cell reaches 208 mW cm^(-2)at 750℃,with high ethane conversion(45.2%),ethylene selectivity(92.5%),and nitrous oxide conversion(19,0%).This multi-win technology is promising for not only the production of chemicals and energy but also greenhouse gas reduction.

关键词： Nonoxidative dehydrogenation of ethane Ethylene Nitrous oxide decomposition Protonic ceramic fuel cell membrane reactor Perovskite oxide

building the conformal protection of VB-group VS_(2)laminated heterostructure based on biomass-derived carbon for excellent broadband electromagnetic waves absorption

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2023年第3期9卷 492-501页

作者： Honghan Wang Huibin Zhang Junye Cheng Tingting Liu Deqing Zhang Guangping Zheng Shangru Zhai Maosheng Cao School of materials Science and Engineering Qiqihar UniversityQiqihar161006China Liaoning key lab of Lignocellulose Chemistry and Biomaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian116034China Department of materials Science Shenzhen MSU-BIT UniversityShenzhenGuangdong Province517182China School of materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Although VB-Group transition metal disulfides(TMDs)VS_(2)nanomaterials with specific electronic properties and multiphase microstructures have shown fascinating potential in the field of electro-magnetic wave(EMW)absorption,the efficient utilization of VS_(2)is limited by the technical bottleneck of its narrow effective absorption bandwidth(EAB)which is attributed to environmental instability and a deficient electromagnetic(EM)loss *** order to fully exploit the maximal utilization values of VS_(2)nanomaterials for EMW absorption through mitigating the chemical instability and optimizing the EM parameters,biomass-based glucose derived carbon(GDC)like sugar-coating has been decorated on the surface of stacked VS_(2)nanosheets via a facile hydrothermal method,followed by high-temperature *** a result,the modulation of doping amount of glucose injection solution(Glucose)could effectively manipulate the encapsulation degree of GDC coating on VS_(2)nanosheets,further imple-menting the EM response mechanisms of the VS_(2)/GDC hybrids(coupling effect of conductive loss,interfacial polarization,relaxation,dipole polarization,defect engineering and multiple reflections and absorptions)through regulating the conductivity and constructing multi-interface heterostructures,as reflected by the enhanced EMW absorption performance to a great *** minimum reflection loss(Rmin)of VS_(2)/GDC hybrids could reach52.8 dB with a thickness of 2.7 mm at 12.2 ***,compared with pristine VS_(2),the EAB of the VS_(2)/GDC hybrids increased from 2.0 to 5.7 GHz,while their environmental stability was effectively enhanced by virtue of GDC ***,this work provides a promising candidate to realize frequency band tunability of EMW absorbers with exceptional perfor-mance and environmental stability.

关键词： VS_(2)/GDC hybrids Multi-interface heterostructures Broadband absorption Environmental stability

Finished surface morphology, microstructure and magnetic properties of selective laser melted Fe-50wt% Ni permalloy

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

Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1439-1452页

作者： Shuohong Gao Xingchen Yan Cheng Chang Xinliang Xie Qingkun Chu Zhaoyang Deng Bingwen Lu Min Liu Hanlin Liao Nouredine Fenineche ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComtéUTBM90010BelfortFrance National Engineering laboratory for Modern materials Surface Engineering Technology The Key Lab of Guangdong for Modern Surface Engineering TechnologyInstitute of New MaterialsGuangdong Academy of SciencesGuangzhou510651China Institute of Mechanics Materials and Civil EngineeringUC LouvainLouvain-la-NeuveBelgium

This work focuses on the structure and magnetic properties of Fe-50wt% Ni permalloy manufactured from the pre-alloyed powder by selective laser melting (SLM). The selective laser melted (SLMed) alloys were characterized by a 3D profilometer,optical microscope, scanning electron microscope, X-ray diffraction, etc. The effects of the volume energy density of laser(LVED) on structure, and magnetic properties with coercivity ( H), remanence ( B), and power losses ( P), were evaluated and discussed systematically. The results show that the relative porosity rate and the surface roughness of the SLMed specimens decreased with the increase in LVED. Only the γ-(FeNi) phase was detected in the X-ray diffraction patterns of the SLMed permalloys fabricated from the different LVEDs. Statistical analysis of optical microscopy images indicated that the grain coarsened at higher LVED. Furthermore, the microstructure of the SLMed parts was a typical columnar structure with an oriented growth of building direction. The highest microhardness reached 198 HV. Besides, the magnetic properties including B, H, and Pof SLMed samples decreased when the LVED ranged from 33.3 to 60.0 J/mm ~3 firstly and then increased while LVED further up to 93.3 J/mm, which is related to the decrease in porosity and the increase in grain size, while the higher residual stress and microcracks presented in the samples manufactured using very high LVED. The observed evolution of magnetic properties and LVED provides a good compromise in terms of reduced porosity and crack formation for the fabrication of SLMed Fe-50 wt% Ni permalloy. The theoretical mechanism in this study can offer guidance to further investigate SLMed soft magnetic alloys.

关键词： Selective laser melting Fe-50wt%Ni permalloy Finished surface morphology Microstructural evolution Magnetic properties

Analysis on Life Cycle CO2 Emission of Aerated Concrete Production in china

在线全文

学校读者我要写书评

暂无评论

Analysis on Life Cycle CO2 Emission of Aerated Concrete Prod...

Future Resources for Eco-building materials:I. Metallurgical Slag

中国材料大会2012

作者： Minghui Fang Zhihong Wang Feifei Shi Boxue Sun Mingnan CUI Suping Zhao Xiance Meng School of materials Science and Engineering Beijing University of Technology china Development Strategy Institute for building materials industry

ISBN: (纸本)9783037856062

Aerated concrete is a new type of wall material with beneficial features like light weight, heat insulation, fire prevention and low energy consumption. As a key milestone in wall materials innovation and energy-saving of building system, it has been proven to be an ideal wall material which can replace traditional clay brick through years of application and practice. This study calculated the CO2 emissions in all the stages of life cycle of aerated concrete production. Compared with clay brick, the life cycle CO2 intensity of aerated concrete block will be decreased by 67.4% with the same insulation effect. Study on the environmental loads of aerated concrete industry will provide theoretical base for the carry out of energy-saving and emission reduction, the formulation of clean production and the development of recycling economy.

关键词： Wall materials Aerated concrete Life cycle assessment Carbon dioxide emission.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(materials Science) 2009年第3期24卷 451-456页

作者：徐德龙 State key lab of Western Architecture & Technology (Cultivating Base) Xi’an University of Architecture and Technology Institute of Powder Engineering School of Materials Science and Engineering Xi’an University of Architecture and Technology

In order to make an effectivily recycle use of iron and steel slags that are main industrial wastes generated in Chinese metallurgical industry, the current technologies for reprocessing and recycling these wastes into eco-building materials were reviewed, such as preparing cement-steel slag blended cement with steel slag after metal recovery, using the fine powder of blast furnace slag （BFS） for manufacturing slag cement and high performance concrete. A further research on using these available resources more efficiently were discussed.

关键词： metallurgical slag reprocessing eco-building materials

NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial key laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

High Temperature Flexural Deformation Properties of Engineered Cementitious Composites (ECC) with Hybrid Fiber Reinforcement

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

Research and Application of materials Science 2020年第2期2卷 17-26页

作者： Zhihui YU Zhen YUAN Chaofan XIA Cong ZHANG Advanced Fiber Reinforced Cementitious Composites lab Jiangnan UniversitySchool of Environmental and Civil EngineeringWuxi214000China State key laboratory of Green building materials Beijing100024China

Engineered Cementitious Composites(ECC)is a class of high-performance fiber reinforced composites with ultra-ductility designed based on micromechanics,and it has been developed for increasing application in the construction industry during recent *** properties of ECC at room temperature have been tested and studied in depth,however,few studies focus on its performance after high temperature that is one of the worst conditions to *** investigate the change tendency and mechanism for the high temperature flexural properties of hybrid fiber reinforced ECC and the feasibility of calcium carbonate whisker to reduce the cost of ECC materials,polyvinyl alcohol fiber(PVA)reinforced strain hardening cementitious composites(PVA-ECC),steel fiber+PVA fiber reinforced ECC(defined as HyFRECC-A)and steel fiber+PVA fiber+CaCO3 whisker reinforced ECC(defined as HyFRECC-B)subject to room temperature and 200℃,400℃,600℃,800℃elevated temperature exposure were experimentally *** results indicate that equally replacing PVA fibers by steel fibers degraded the flexural hardening ability of PVA-ECC at room temperature,while the addition of appropriate amount of CaCO3 whisker improved the flexural strength,toughness and flexural hardening *** elevated temperature posed a significant effect on the flexural strength and toughness of the three types of *** deflection hardening behavior of the three types of ECCs was eliminated after high temperature *** strength and toughness of PVA-ECC presented an exponential decay along with the increase of *** addition of steel fiber slowed down the decay *** the use of CaCO3 whisker increased the post-temperature flexural strength and toughness of HyFRECC-B,the decay rate was not further decreased.

关键词： engineered cementitious composites hybrid fiber high temperature flexural behavior