检索结果-南通市图书馆

Influence of Coupled Chemo-Mechanical Process on Corrosion Characteristics in Reinforcing Bars

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 Wuhan University of Technology(Materials Science) 2013年第3期28卷 538-543页

作者：徐亦冬钱春香 School of Materials Science and Engineering Southeast University research center of green Building Materials and Waste Resources Reuse Ningbo Institute of Technology of Zhejiang University

We studied the corrosion characteristics of reinforcing bars in concrete under different corrosion conditions. The area-box （AB） value was used to classify the shape of pitting corrosion morphology in meso-scale, and fractographs of reinforcing bars with different corrosion morphology were discussed in micro- and macro-scales. The results show that the existence of the tensile stress affects the corrosion characteristics of reinforcing bars. The pitting morphology and fractograph of reinforcing bars exhibit a statistical fractal feature. The linear regression model fits the relationship between fractal dimensions of corrosion morphology and fractal dimension of fractograph fairly well. Using fractal dimension as the characterization parameter can not only reflect the characteristics of pitting corrosion morphology in reinforcing bars, but also reveal the fracture feature of corroded reinforcing bars.

关键词： reinforcing bar chemo-mechanical coupling pitting corrosion morphology fractograph fractal

Synthesis and Antifungal Activity of Novel Chiral α-Aminophosphonates Containing Fluorine Moiety

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2006年第11期24卷 1581-1588页

作者：杨松高兴文刁春玲宋宝安金林红徐广芳张国平王伟胡德禹薛伟周霞卢平 Key Laboratory of green Pesticide and Agricultural Bioengineering Ministry of Education Center for Research and Development of Fine Chemicals Guizhou University Guiyang Guizhou 550025 China

Chiral α-aminophosphonates were synthesized using （R） or （S）-1-phenylethylamine in the presence of BF3·Et2O under microwave irradiation in moderate to good yields. The new compounds were identified by ^1H NMR, ^19F NMR, IR and elemental analysis. Their antifungal activities were evaluated and some compounds were found to exhibit excellent antifungal activities. To the best of our knowledge, this is the first report on antifungal activity of chiral α-aminophosphonates containing fluorine moiety.

关键词： chiral aminophosphonate fluorine moiety antifungal activity microwave irradiation synthesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Oncology research 2024年第2期32卷 421-432页

作者： SEUNG-HEE GWAK JUHYUN LEE EUNJI OH DOHYUN LEE WONSHIK HAN JONGMIN KIM KYONG-TAI KIM Department of life Sciences Pohang University of Science and TechnologyPohang37673Korea R&D center NovMetaPharma Co.Ltd.Pohang37668Korea Department of Surgery and Cancer research Institute Seoul National University College of MedicineSeoul03080Korea Generative Genomics research center Global Green Research&Development CenterHandong Global UniversityPohang37554Korea

Genetic information is transcribed from genomic DNA to mRNA,which is then translated into threedimensional *** can undergo various post-transcriptional modifications,including RNA editing that alters mRNA sequences,ultimately affecting protein *** this study,RNA editing was identified at the 499th base(c.499)of human vaccinia-related kinase 2(VRK2).This RNA editing changes the amino acid in the catalytic domain of VRK2 from isoleucine(with adenine base)to valine(with guanine base).Isoleucine-containing VRK2 has higher kinase activity than the valine-containing VRK2,which leads to an increase in tumor cell *** we reported that VRK2 directly interacts with dystrobrevin-binding protein(dysbindin)and results in reducing its ***,we demonstrate that isoleucine-containing VRK2 decreases the level of dysbindin than valinecontaining *** interacts with cyclin D and thereby regulates its expression and *** reduction in the level of dysbindin by isoleucine-containing VRK2 further enhances the cyclin D expression,resulting in increased tumor growth and reduction in survival *** has also been observed that in patient samples,VRK2 level was elevated in breast cancer tissue compared to normal breast ***,the isoleucine form of VRK2 exhibited a greater increase in breast cancer ***,it is concluded that VRK2,especially dependent on the 167th variant amino acid,can be one of the indexes of tumor progression and proliferation.

关键词： VRK2 Kinase activity Breast cancer Tumor RNA editing Cell proliferation Cell growth

A haplotype-resolved genome assembly of tetraploid Medicago sativa ssp. falcata

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China life Sciences 2024年

作者： Wanying Li Xuanzhao Li Wei Li Haibo Yang Diandian Guo Ting Guo Yingying Meng Qiang He Hao Lin Huilong Du Lifang Niu Biotechnology research Institute Chinese Academy of Agricultural Sciences School of life Sciences Institute of Life Sciences and Green Development Basic Science Center for Biotic Interaction in Hebei Hebei University

Dear Editor,High-yield, high-quality, and stress-tolerant forage crops are crucial for the sustainable development of grass-based livestock husbandry. Medicago species are among the most important legume forage crops worldwide. Alfalfa(Medicago sativa subsp. sativa, M. sativa ssp. sativa), a crop known as the “Queen of the Forages”, has high biomass productivity, high nutritional value, and good adaptability.

关键词：

Built-in electric field intensified by photothermoelectric effect drives charge separation over Z-scheme 3D/2D In_(2)Se_(3)/PCN heterojunction for high-efficiency photocatalytic CO_(2) reduction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第12期179卷 251-261页

作者： Hongjun Dong Lei Tong Pingfan Zhang Daqiang Zhu Jizhou Jiang Chunmei Li Institute of green Chemistry and Chemical Technology School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China School of Environmental Ecology and Biological Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China

It is a challenging issue to further drive charge separation through the oriented design of Z-scheme het-erojunction in the exploitation of cost-effective photocatalytic *** this contribution,the unique Z-scheme 3D/2D In_(2)Se_(3)/PCN heterojunction is developed through implanting In_(2)Se_(3) microspheres on PCN nanosheets using an in situ growth technique,which acquires the effective CO generation activity from photocatalytic CO_(2) reduction(CO_(2)R).The CO yield of 4 h in the CO_(2)R reaction over the optimal In_(2)Se_(3)/PCN-15 sample reaches up to 11.40 and 2.41 times higher than that of individual PCN and In_(2)Se_(3),*** greatly enhanced photocatalytic performance is primarily the improvement of photo-generated carrier separation *** be more specific,the formed built-in electric field is signifi-cantly intensified by producing the temperature difference potential between In_(2)Se_(3) and PCN owing to the photothermoelectric effect of In_(2)Se_(3),which actuates the high-efficiency separation of photogenerated charge carriers along the Z-scheme transfer path in the In_(2)Se_(3)/PCN *** effective strat-egy of enhancing the built-in electric field to drive photogenerated charge separation proposed in this work opens up an innovative avenue to design Z-scheme heterojunction applied to high-efficiency pho-tocatalytic reactions,such as hydrogen generation from water splitting,CO_(2)R,and degradation of organic pollutants.

关键词： In_(2)Se_(3)/PCN Z-scheme heterojunction Photocatalytic CO_(2) reduction Enhanced built-in electric field Photothermoelectric effect

Structure-regulated fluorine-containing additives to improve the performance of perovskite solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano research 2024年第7期17卷 6080-6086页

作者： Peiya Chen Xiaoman Bi Hao Yan Yingjie Zhao Yihao Liu Zhuo Huang Qian Xiao Yongpeng Yang Shasha Zhang Yiqiang Zhang Yanlin Song Henan Institute of Advanced Technology College of ChemistrySchool of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Key Laboratory of green Printing CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(ICCAS)Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyNational Laboratory for Molecular Sciences(BNLMS)Beijing 100190China

Perovskite solar cells(PSCs)have seen remarkable progress in recent years,largely attributed to various additives that enhance both efficiency and *** these,fluorine-containing additives have garnered significant interest because of their unique hydrophobic properties,effective defect passivation,and regulation capability on the crystallization ***,a targeted structural approach to design such additives is necessary to further enhance the performance of ***,fluoroalkyl ethylene with different fluoroalkyl chain lengths(CH_(2)CH(CF_(2))nCF_(3),n=3,5,and 7)as liquid additives is used to investigate influences of fluoroalkyl chain lengths on crystallization regulation and defect *** findings indicate that optimizing the quantity of F groups plays a crucial role in regulating the electron cloud distribution within the additive *** optimization fosters strong hydrogen bonds and coordination effects with FA+and uncoordinated Pb^(2+),ultimately enhancing crystal quality and device ***,1H,1H,2H-perfluoro-1-hexene(PF_(3))with the optimal number of F presents the most effective modulation effect.A PSC utilizing PF_(3)achieves an efficiency of 24.05%,and exhibits exceptional stability against humidity and thermal *** work sheds light on the importance of tailored structure designs in additives for achieving high-performance PSCs.

关键词： perovskite solar cells fluorine number additive structure crystallization regulation defect passivation

Synthesis,in vitro antibacterial and antifungal evaluation of novel 1,3,4-oxadiazole thioether derivatives bearing the 6-fluoroquinazolinylpiperidinyl moiety

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 2020年第2期31卷 434-438页

作者： Jun Shi Na Luo Muhan Ding Xiaoping Bao State Key Laboratory Breeding Base of green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationCenter for Research and Development of Fine ChemicalsGuizhou UniversityGuiyang 550025China

A series of structurally novel 1,3,4-oxadiazole thioether derivatives(6a-6z) containing a 6-fluoroquinazolinylpiperidinyl moiety were designed and synthesized using pharmacophore hybrid approach,and their structures were fully characterized by ^1H NMR,^(13)C NMR and HRMS *** them,the structure of compound 6 d was further corroborated via single-crystal X-ray diffraction *** vitro antibacterial bioassays showed that compounds 6 a,6 g,6 u and 6 v possessed EC_(50) values of 30.4,30.6,27.5 and 26.0 μg/mL against phytopathogenic bacterium Xanthomonas oryzae ***,respectively,which were significantly superior to that of commercially-available bactericide Bismerthiazol(85.1 μg/mL).Moreover,in vitro antifungal bioassays indicated that seven compounds demonstrated broad-spectrum fungicidal acitivties against six types of phytopathogenic fungi at 50 μg/*** present work showed the potential of 1,3,4-oxadiazole thioether derivatives carrying a 6-fluoroquinazolinylpiperidinyl moiety as effective antimicrobial agents for crop protection,deserving further investigations in the future.

关键词： 1,3,4-Oxadiazole thioether Fluoroquinazolinylpiperidinyl Synthesis Antibacterial activity Antifungal activity

Synthesis and Performance of Li Fe_xMn_(1-x)PO_4/C as Cathode Material for Lithium Ion Batteries

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) 2015年第4期30卷 655-659页

作者：刘学武 QIN Xusong WANG Xiaojuan LI Xin CHEN Shen School of Chemical Machinery Dalian University of Technology center for green Products and Processing Technologies Guangzhou HKUST Fok Ying Tung Research Institute

life Mn1-xPO4/C composites were synthesized by a solid-state reaction route using phenolic resin as both reducing agent and carbon source. The effect of Fe doping on the crystallinity and electrochemical performance of lifexMnt xPOJC was investigated. The experimental results show that the Fe2＋ substitution for Mn2＋ will lead to crystal lattice shrinkage of life Mn1-xPO4/C particles due to the smaller ionic radii of Fe2＋ In the investigated Fe doping range （x = 0 to 0.7）, life Mn1-xPO4/C （x = 0.4） composites exhibited a maximum discharge capacity of 148.8 mAh/g at 0.1 C while LiF%MnI_xPO4/C （x = 0.7） composite showed the best cycle capability with a capacity retention ratio of 99.0% after 30 cycles at 0.2 C. On the contrary, the life Mnl-xPO4/ C （x = 0.5） composite performed better trade-off on discharge capacity and capacity retention ratio, 127.2 mAh/ g and 94.7% after the first 30 cycles at 0.2 C, respectively, which is more preferred for practical applications.

关键词： LiMnP04 Fe doping solid-state reaction route phenolic resin

Study of the synthesis,antiviral bioactivity and interaction mechanisms of novel chalcone derivatives that contain the 1,1-dichloropropene moiety

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第7期28卷 1566-1570页

作者： Liang-Run Dong De-Yu Hu Zeng-Xue Wu Ji-Xiang Chen Bao-An Song State Key Laboratory Breeding Base of green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationResearch and Development Center for Fine ChemicalsGuizhou UniversityGuiyang 550025China

A series of novel chalcone derivatives that contain the 1,1-dichloropropene moiety was designed and synthesized. Bioactivity assays showed that most of the target compounds exhibited moderate to good antiviral activity against tobacco mosaic virus（TMV） at 500 mg/m L. Among the target compounds,compound 7h showed the highest in vivo inactivation activity against TMV with the EC50 and EC90value of 45.6 and 327.5 mg/m L, respectively, which was similar to that of Ningnanmycin（46.9 and 329.4 mg/m L）and superior to that of Ribavirin（145.1 and 793.1 mg/m L）. Meanwhile, the microscale thermophoresis and fluorescence spectroscopy experiments showed that the compound 7h had a strong interaction with the tobacco mosaic virus coat protein.

关键词： Chalcone derivatives 1 1-Dichloropropene moiety Synthesis Antiviral activity Interaction mechanisms