检索结果-南通市图书馆

Effect of SiO_2/Na_2O mole ratio on the properties of foam geopolymers fabricated from circulating fluidized bed fly ash

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2014年第6期21卷 620-626页

作者： Ze Liu Ning-ning Shao Tian-yong Huang Jun-feng Qin Dong-min wang Yu Yang School of Chemical and Environmental Engineering China University of Mining and Technology

Geopolymers are three-dimensional aluminosilicates formed in a short time at low temperature by geopolymerization. In this pa-per, alkali-activated foam geopolymers were fabricated from circulating fluidized bed fly ash （CFA）, and the effect of SiO2/Na2O mole ratio （0.91-1.68） on their properties was studied. Geopolymerization products were characterized by mechanical testing, scanning electron mi-croscopy （SEM）, energy-dispersive X-ray spectroscopy （EDX）, and X-ray diffraction （XRD）. The results show that SiO2/Na2O mole ratio plays an important role in the mechanical and morphological characteristics of geopolymers. Foam samples prepared in 28 d with a SiO2/Na2O mole ratio of 1.42 exhibit the greatest compressive strength of 2.52 MPa. Morphological analysis reveals that these foam geo-polymers appear the relatively optimized pore structure and distribution, which are beneficial to the structure stability. Moreover, a combina-tion of the Si/Al atomic ratio ranging between 1.47 and 1.94 with the Na/Al atomic ratio of about 1 produces the samples with high strength.

关键词： foamed products geopolyrners fly ash strength of materials morphology silicon oxide sodium oxide

High-performance aqueous symmetric sodium-ion battery using NASICON-structured Na2VTi（PO4）3

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第1期11卷 490-498页

作者： Hongbo wang Tianran Zhang Chao Chen min Ling Zhan Lin Shanqing Zhang Feng Pan Chengdu Liang Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China Department of Mechanical Engineering National University of Singapore Singapore 117576 Singapore College of Light Industry and Chemical Engineering Guangdong University of Technology 6uangzhou 510006 China Centre for Clean Environment and Energy Environmental Futures Research Institute and Griffith School of Environment Gold Coast Campus Gfiffith University QLD 4222 Australia School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055 China

A high-safety and low-cost route is important in the development of sodium-ion batteries, especially for large-scale stationary battery systems. An aqueous sodium-ion battery is demonstrated using a single NASICON-structured Na2VTi（PO4）3 material with the redox couples of V4＋/V3＋ and Ti4＋/Ti3＋ working on the cathode and anode, respectively. The symmetric full cell fabricated based on the bi-functional electrode material exhibits a well-defined voltage plateau at ~ 1.2 V and an impressive cycling stability with capacity retention of 70% exceeding 1,000 cycles at 10C （1C = 62 mA.g-1）. This study provides a feasible strategy for obtaining high-safety and low-cost rechargeable batteries using a single active material in aqueous media.

关键词： Na2VTi(PO4) 3 aqueous symmetric sodium-ion batteries

Zrs5.8Al19.4（CO1-xCux）24.8 （x = 0-0.8 at.%） bulk metallic glasses for surgical devices applications

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

Journal of Iron and Steel Research International 2018年第6期25卷 644-649页

作者： Kai-ming Han Jian-bing Qiang Ying-min wang1 Bing-bing Zhao Peter Haussler Key Laboratory of Materials Modification by Laser Ion andElectron Beams (Ministry of Education) Dalian Universityof Technology Dalian 116024 Liaoning China ArcX Coating Hub Asia Hoganais (China) Co. Ltd.Shanghai 201799 China Physics Institute Chemnitz University of Technology09107 Chemnitz Germany

Zr-Al-Co-Cu bulk metallic glasses （BMGs） are promising surgical materials. By using the electron concentration criterion for BMG composition design, a series of Zr55.8Al19.a（Co1-xCux）24.8 （x = 0-0.8 at.%） alloys were produced, of which BMG rod samples with different diameters were made by copper mold casting. Among these alloys, the Zr55.8A119.4Co17.36Cu7.44 BMG exhibited a centimeter-scale glass formation size （dmax = 12 mm）, an ultrahigh strength （δy = 2.04 GPa）, a large room-temperature plasticity （εp = 4.0%）, and a fracture toughness （KQ = 120 MPa m^l/2）, as well as good corrosion resistance in phosphate-buffered solution. The attAlnment of the combination of properties as large glass-forming ability with excellent mechanical and corrosion stability would suit the surgical devices applications.

关键词： Zr-Al-Co-Cu Bulk metallic glass Biomedical material Mechanical property

Synthesis, chemical nuclease activity, and in vitro cytotoxicity of benzimidazole-based Cu(Ⅱ)/Co(Ⅱ) complexes

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

Chinese Chemical Letters 2017年第7期28卷 1539-1546页

作者： Jin-An Zhao Huai-Bin Yu Shuang-Cheng Zhi rui-Na Mao Ji-Yong Hu Xiao-Xiao wang College of Material and Chemical Engineering Henan University of Urban Construction College of Chemistry and Molecular Engineering Zhengzhou University

In this study, novel mono/di-nuclear Cu（p-2-bmb）（OH）（Cl O4）（1） and Co2（p-2-bmb）2Cl4（2）（p-2-bmb = 1-（（2-（pyridin-2-yl）-benzoimidazol-1-yl）methyl）-1H-benzotriazole） complexes with the nitrogen heterocyclic benzimidazole-based ligand were synthesized and characterized. The two complexes showed antiproliferative effects in various carcinoma cell lines, especially complex 1 in the SMMC7721 tumor cell line. Complex 1 was also able to pass through the cell membrane and enter the nucleus and mitochondrion. An analysis of in vitro chemical nuclease activity revealed that complex 1 partially intercalated to calf thymus DNA and exhibited strong unwinding activity against p BR322 superhelical plasmid DNA. The comet assay and flow cytometry analysis confirmed that 1 caused extensive DNA damage and arrested SMMC7721 tumor cells at G2/M phase of the cell cycle, leading to loss of mitochondrial membrane potential and apoptosis. These results suggest that these benzimidazole-based metal complexes could be potential anti-cancer agents.

关键词： Cu(II)/Co(II) complexes Benzimidazole-based ligand Chemical nuclease activity Apoptosis Anti-cancer agents

Phototransformation of nitrobenzene in the Songhua River:Kinetics and photoproduct analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第7期20卷 787-795页

作者： wang, Aimin HU, Chun QU, Jiuhui YANG, min LIU, Huijuan RU, Jia QI, Rong SUN, Jingfang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Nitrobenzene (NB) pollution of the Songhua River caused by an explosion at a petrochemical plant in Jilin City,Jilin Province, China,attracted public concern over the fate of NB in the *** one of the efforts to predict the fate of residual NB in the river,the kinetics and mechanism of phototransformation of NB in natural water from four sections of the Songhua River were *** was found that photodegradation of NB in water proceeded via pseudo-first-order reaction kinetics under simulated sol...

关键词： nitrobenzene phototransformation mechanism the Songhua River nitrate by-products

The Emergence, Epidemiology, and Etiology of Haff Disease

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2019年第10期32卷 769-778页

作者： PEI Pei LI Xiao Yan LU Shuang Shuang LIU Zhe wang rui LU Xuan Cheng LU Kai Chinese Center for Disease Control and Prevention

Haff disease is a type of human rhabdomyolysis characterized by the sudden onset of unexplained muscular rigidity and an elevated serum creatine kinase level within 24 h after consuming cooked aquatic products. Here, we reviewed a previous study on Haff disease and summarized the clinical manifestations,epidemiological characteristics, and etiological data to confirm the incidence and global epidemiology of the disease and identify the most common seafood vectors. Future directions for Haff disease study will include further prospective etiological studies and the development of prevention and control strategies.

关键词： Rhabdomyolysis Seafood Haff disease Crayfish Epidemiology

The change of cloud top height over East Asia during 2000–2018

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2020年第2期11卷 110-117页

作者： ZHAO min ZHANG Hua wang Hai-Bo ZHOU Xi-Xun ZHU Li AN Qi CHEN Qi State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing100081China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China

In order to know how regional averaged cloud top height(CTH)responded to the past climatic change,the spatial and temporal variations of CTH based on MODIS data(MOD03_08_v6.0)from March 2000 to February 2018 are *** results show that the CTH in East Asia was higher in the southwest and lower in the *** annual mean CTH was found to increase in East Asia at the rate of 0.020 km per year,of which,0.035 km per year over the eastern land and 0.034 km per year over the eastern *** CTH changes statistically correlated with the sea surface temperature changes over the eastern sea(r=0.68),which indicates that the CTH changes may be affected by the underlying *** significant increasing trend of annual mean CTH was found in the latitude zone of 30°–40°***,CTH showed decreasing trends of about−0.030 km per year in the Middle-Lower Yangtze River Basin,Tarim Basin,Turpan Basin and northeastern Sichuan Basin in summer since more low cloud formations benefited to the decrease of *** winter,the decreasing trend of CTH was found over the north of 40°N,whereas the increasing trend was found over the south of 40°N in East Asia.

关键词： Cloud top height Variation trend MODISEast Asia Climatic change

Direct electrodeposition of ionic liquid-based template-free Sn Co alloy nanowires as an anode for Li-ion batteries

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

International Journal of minerals,Metallurgy and Materials 2018年第9期25卷 1027-1034页

作者： Le-ping wang Gang Chen Qi-xin Shen Guo-min Li Shi-you Guan Bing Li School of Materials science and Engineering East China University of Science and Technology Institute for Sustainable Energy Shanghai University

Sn Co alloy nanowires were successfully electrodeposited from Sn Cl2-Co Cl2-1-ethyl-3-methylimidazolium chloride(EMIC) ionic liquid without a template. The nanowires were obtained from the molar ratio of 5:40:60 for Sn Cl2(25)Co Cl2(25)EMIC at-0.55 V and showed a minimum diameter of about 50 nm and lengths of over 20 μm. The as-fabricated SnCo nanowires were about 70 nm in diameter and featured a Sn/Co weight ratio of 3.85:1, when used as an anode for a Li-ion battery, they presented respective specific capacities of 687 and 678 m Ah·g^(-1) after the first charge and discharge cycle and maintained capacities of about 654 m Ah·g^(-1) after 60 cycles and 539 m Ah·g^(-1) after 80 cycles at a current density of 300 m A·g^(-1). Both the nanowire structure and presence of elemental Co helped buffer large volume changes in the Sn anode during charging and discharging to a certain extent, thereby improving the cycling performance of the Sn anode.

关键词： SnCo alloy nanowires template electrodeposition ionic liquid

Hot deformation map and its application of GH4706 alloy

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2014年第5期21卷 462-468页

作者： Shuo Huang Lei wang Xin-tong Lian Guang-pu Zhao Fang-fei Li Xiao-min Zhang Key Lab for Anisotropy and Texture of Materials Northeastern University Department of High Temperature Materials Central Iron and Steel Research Institute

The hot deformation behaviors of GH4706 alloy were investigated using compression tests in a deformation temperature range from 900℃ to 1200℃ with a strain rate range of 0.001-1 s-1. Hot processing maps were developed on the basis of the dynamic material model and compression data. A three-dimensional distribution of power dissipation parameter （η） with strain rate and temperature reveals that η decreases in sensitivity with an increase in strain rate and a decrease in temperature. Microstructure studies show that the grain size of GH4706 alloy increases when η is larger than 0.32, and the microstructure exhibits local deformation when r/is smaller than 0.23. The hot processing map at the strain of 0.7 exposes a domain peak at 7=0.32 for the temperature between 940℃ and 970℃ with the strain rate from 0.015 s-1 to 0.003 s-1, and these are the optimum parameters for hot working.

关键词： superalloys nickel alloys deformation microstructure dynamic recrystallization