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| 1 | Effects of AlCoCrFeNiTi high-entropy alloy on microstructure and mechanical properties of pure aluminum显示文摘A new kind of AlCoCrFeNiTi high-entropy alloy(HEA)as a grain refiner was prepared by vacuum arc melting.In this work,the effects of HEA(1.0 wt.%,2.0 wt.%and 3.0 wt.%)on the microstructure and mechanical properties of pure aluminum were studied.The microstructure was characterized and examined by scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),electron probe micro-analyzer(EPMA)and transmission electron microscopy(TEM)to indicate the refining abilities and mechanism of HEA on pure aluminum.Results show that the addition of HEA refined both the macrostructure and microstructure of pure aluminum.When 1.0 wt.%HEA was added,most coarse columnar grains were refined into equiaxed crystals,and as the amount of HEA increased to 2.0 wt.%and3.0 wt.%,aluminum grains were further refined,and the grain boundaries were nearly indistinguishable.Moreover,the morphology ofα-Al transformed from coarse columnar crystals to equiaxed grains,and the mean size ofα-Al grains decreased from 374μm to 27μm.The Al3Ti,Al3Ni,and nano-phase precipitated from the aluminum alloy with HEA in the solidification.The typical rod-like nano-phases distributed interdendritic regions ofα-Al.The average length of nano-phases is 2568 nm,4372 nm,and 6907 nm and the average diameter is 112 nm,103 nm,and 92 nm when 1.0 wt.%,2.0 wt.%and 3.0 wt.%HEA were added to the pure aluminum,respectively.The ultimate tensile strength(UTS)and yield strength(YS)were improved in all samples,whereas the elongation(El)was decreased with increasing HEA concentration.When 3.0 wt.%HEA was added into the aluminum melt,the UTS was improved by 145.2%from62 MPa to 152 MPa,the YS was increased by 173.8%from 42 MPa to 115 MPa,and the El was decreased by 33.3%from 39%to 26%. | Qinglin Li Shang Zhao Xuepeng Bao Yushi Zhang Yuqian Zhu Chuangzao Wang Yefeng Lan Yuxin Zhang Tiandong Xia | 2020 | Journal of Materials Science & Technology2020，52，17： | 2 |
| 2 | Synthesis and insecticidal evaluation of novel sulfide-containing amide derivatives as potential ryanodine receptor modulators显示文摘With the aim of discovering new bioactive pesticides for crop protection,a series of novel sulfidecontaining amide derivatives A were efficiently synthesized via a strategy of modifying the“amide”structure of anthranilic diamide insecticides.The single-crystal structures of A2-3 and A4-5 were firstly reported.The bioassay results showed that most of the synthesized compounds display moderate to high insecticidal activities.Particularly,some sulfone-containing compounds,e.g.,A2-3,A3-3 and A6-3,not only possessed favorable lethality rate(50%–100%)against P.xylostella at a concentration of 0.1 mg/L,but also held good activities towards a variety of agricultural pests such as M.separata,C.pipiens pallen,H.armigera and O.nubilalis;the larvicidal activities of A4-1 and A6-1 towards P.xylostella were close to that of chlorantraniliprole at 0.01 mg/L.The calcium imaging experiments revealed that the representative compounds A2-3 and A6-3 are potential ryanodine receptor(RyR)modulators.The structure–activity relationships were discussed in detail.These results provide useful information for further design and development of novel insecticides. | Yan Zhang Yuxin Li Huan Li Junfeng Shang Zhengming Li Baolei Wang | 2022 | Chinese Chemical Letters2022，33，1： | 1 |
| 3 | Experimental research on eccentric compressive performance of steel tube - reinforced concrete column 显示文摘 | Guo Quanquan Zhao Yuxin Shang Kun | 2011 | Advanced Materials Research2011，，163167： | 1 |
| 4 | Effect of wet storage on alkali-oxygen pulping of bagasse显示文摘Carbohydrate degradation is a serious problem in alkali-oxygen pulping due to the inherently oxidative reaction conditions.Hemicellulose and short-chain cellulose are particularly susceptible to degradation by oxidation,and thus have a great effect on the pulping yield,as well as the viscosity and crystallinity of resultant pulp in alkali-oxygen pulping.Removal of the low molecular weight substances by wet storage prior to alkali-oxygen pulping may increase the pulping yield and improve pulp properties,in addition to savings in pulping chemicals and energy.This paper investigated alkali-oxygen pulping of bagasse pretreated by wet storage,and results show that wet storage of bagasse had a significant effect on its alkali-oxygen pulping,in terms of pulping yield,pulp viscosity and crystallinity.The pH and time were found to be the two most important factors in wet storage on bagasse.Pulp crystallinity increased from 31.78%to 42.06%when the wet storage of bagasse was performed at pH 6.0 for 16 days.In addition,the screened pulp yield increased from 58 to 60%,and pulp viscosity increased from 650 to 700 mL/g.The improved pulping performance was attributed to increased pore volumes in bagasse due to dissolution of low molecular weight lignin and carbohydrates during wet storage,which in turn improved the selectivity of delignification in the alkali-oxygen pulping process. | Zhen Shang Bing Sun Yuxin Liu Li Bao | 2018 | Journal of Bioresources and Bioproducts2018，3，1： | 0 |
| 5 | Shape-Controlled Synthesis of Copper Nanocrystals for Plasmonic,Biomedical,and Electrocatalytic Applications显示文摘CONSPECTUS:As a metal that can occur in nature in the elemental form,copper(Cu)has been used by humans since ca.8000 BC.With most properties matching those of Ag and Au,Cu has played a more significant role in commercial applications owing to its much higher(the 25th among all elements)abundance in Earth’s crust and thus more affordable price.In addition to its common use as a conductor of heat and electricity,it is a constituent of various metal alloys for hardware,coins,strain gauges,and thermocouples. | Zhiheng Lyu Yuxin Shang Younan Xia | 2022 | Accounts of Materials Research2022，3，11： | 0 |
| 6 | Microwave-assisted alkali extraction of bagasse hemicellulose enhanced by an enzymatic pretreatment process显示文摘Extraction of hemicelluloses is a primary step in the conversion of plant biomass to valuable biofuels and chemicals.Hemicellulose is distributed in the fiber cell wall,and the compact structure of the fiber cell wall barricades the transport of hemicelluloses in the extraction process.In this paper we presented a novel microwave-assisted extraction process enhanced with an enzymatic pretreatment to improve the hemicelluloses extraction rate from bagasse.Experimental results showed that the enzyme dosage,alkali concentration and microwave irradiation time were main factors governing the yield of hemicellulose.The optimal conditions of the enzymatic pretreatment were:enzyme dosage of 138 IU/g bagasse and irradiation time of 30 min.Under these conditions,86%of the hemicellulose in bagasse was extracted.After the enzymatic pretreatment the surface area of bagasse increased significantly which facilitated the subsequent microwave-assisted extraction process. | Jizhen Huang Yuxin Liu Bing Sun Zhen Shang | 2017 | Journal of Bioresources and Bioproducts2017，2，3： | 0 |
| 7 | MMSE Turbo Equalizer with Preprocessor显示文摘 | ZHANG Lei SHANG Yong CHENG Yuxin XIANG Haige | 2009 | Chinese Journal of Electronics2009，18，3： | 0 |
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