检索结果-南通市图书馆

维普期刊数据库博看期刊

Thermodynamic re-assessment of the Mg-Gd-Y ternary system coupling with the driving forces for phase precipitations during aging process

在线全文

学校读者我要写书评

暂无评论

镁合金学报(英文) 2023年第7期11卷 2495-2517页

作者： Xiaopan Wu Changrong Li cuiping guo Zhenmin Du School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

Based on the available experimental phase equilibrium relations and aging precipitation sequences,the Mg–Gd–Y ternary system has been thermodynamically re-assessed by means of CALPHAD *** simulate the experimentally reported aging precipitation sequence,α(Mg)_(SS)(supersaturated)→GP zones(D019-type,metastable)→β’-Mg_(7)Gd(c-bco,metastable)→β_(1)-Mg_(3)Gd(fcc,metastable)→β-Mg_(5)Gd(fcc,stable)near the Mg–Gd side,andα(Mg)SS(supersaturated)→β’-Mg_(7)Y(c-bco,metastable)→β-Mg_(24)Y_(5)(bcc,stable)near the Mg–Y side,the effective nucleation driving forces obtained by deducting the nucleation resistances from the thermodynamic driving forces are calculated and *** metastable components,GP zones(D019-type)andβ’(c-bco)ordered fromα(Mg)_(SS),do not exist in the stable equilibrium phase diagram but appear in the annealing process of typical *** Redlich–Kister equations are adopted to describe three solution phases,Liquid,HCP_A3 and BCC_*** intermediate compounds Mg_(2)Y,Mg_(24)Y_(5),Mg_(2)Gd,Mg_(3)Gd and Mg_(5)Gd are expressed by the formulas of(Mg,Y)_(2/3)(Gd,Mg,Y)_(1/3),Mg_(24/29)(Gd,Mg,Y)_(4/29)Y1/29,(Gd,Mg)_(2/3)(Gd,Mg,Y)_(1/3),(Gd,Mg)_(3/4)(Gd,Mg,Y)_(1/4)and Mg_(5/6)(Gd,Mg,Y)_(1/6),*** particular,the two-sublattice models(Gd,Mg,Y)_(1/2)(Gd,Mg,Y)_(1/2),(Gd,Mg,Y)_(3/4)(Gd,Mg,Y)_(1/4)and(Gd,Mg,Y)_(7/8)(Gd,Mg,Y)_(1/8)have been respectively used to describe the stable Mg(Gd,Y)(BCC_B2)alloy compound as well as the metastable GP zones(D019-type)andβ’(c-bco)phase,in order to cope with the order-disorder transitions.A set of self-consistent thermodynamic parameters has been obtained to ensure the thermodynamic calculations well consistent with the reported experimental data,containing not only the stable equilibrium phase diagram but also the aging precipitation sequence.

关键词： Mg-Gd-Y ternary system Thermodynamic re-assessment Aging precipitation sequence Nucleation driving force CALPHAD technique

Thermodynamic modeling of the La-Mg-Y system and Mg-based alloys database

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第5期25卷 492-500页

作者： DU Zhenmin guo cuiping LI Changrong ZHANG Weijing Department of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

As an example of the La-Mg-Y system, the method how to set up the themaodynamic model of individual phases was introduced in the process of thermodynamic optimization. The solution phases （liquid, body-centered cubic, face-centered cubic, hexagonal close-packed and double hexagonal close-packed） were modeled with the Redlich-Kister equation. The compound energy model has been used to describe the thermodynamic functions of the intermetallic compounds in the La-Mg-Y systems. The compounds Mg2Y, Mg24Y5, Mg12La, Mg17La2, Mg41Las, Mg3La and Mg2La in the La-Mg-Y system were treated as the formulae （Mg,Y）2（La,Mg,Y）, Mg24（La,Mg,Y）4Y, Mg12（La, Y）, Mg17（La,Y）2, Mg41（La,Y）5, Mg3（La,Mg,Y） and Mg2（La, Y）, respectively. A model （La, Mg,Y）0.5（La,Mg,Y）0.5 was applied to describe the compound MgM formed by MgLa and MgY in order to cope with the order-disorder transition between body-centered cubic solution （A2） and MgM with CsCl-type structure （B2） in the La-Mg-Y system. The Gibbs energies of individual phases were optimized in the La-Mg, La-Y and La-Mg-Y systems by CALPHAD technique. The projection of the liquidus surfaces for the La-Mg-Y system was predicted. The Mg-based alloys database including 36 binary and 15 ternary systems formed by Mg, Al, Cu, Ni, Mn, Zn and rare earth elements was set up in SGTE standard.

关键词： La-Mg-Y system thermodynamic modeling CALPHAD technique order-disorder transition Mg-based alloys database

The Role of Ti in the Preparation of SiC/7075 Aluminum Matrix Composite

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) 2020年第2期35卷 293-298页

作者： ZHANG Wenda CHEN Chengcheng XU Hong CHE Luchang guo cuiping DU Zhenmin Department of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China Southwest Technique and Engineering Institute Chongqing 400039China

SiC/7075 aluminum matrix composites were prepared by a liquid stirring *** role of Ti facilitating the preparation of SiC/7075 aluminum matrix were studied by means of direct-reading spectrometer,scanning electron microscope,energy dispersive spectrometer,X-ray diffraction and the sessile drop *** results show that the SiC content in the SiC/7075 composite increases with an increase of Ti *** addition of Ti can significantly improve the wettability of SiC/Al system,there is a critical value of above 0.5%of Ti content in improving the wettability of the Al/SiC system at *** temperature of the"non wetting-wetting"transition for the(Al-2Ti)/SiC system is about 1123K,the contact angle decreases to 88°at 200 seconds and reaches a stable contact angle of 28°at 2100 seconds.

关键词： aluminum matrix composites Al3Ti particles SiC particles wettability

Phases equilibrated with long-period stacking ordered phases in the Mg-rich corner of the Mg-Y-Zn system

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第9期68卷 147-159页

作者： Yongxin Ruan Changrong Li Yuping Ren Xiaopan Wu Schmid-Fetzer cuiping guo Zhenmin Du School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Institute of Metallurgy Clausthal University of TechnologyRobert-Koch-Str.42D-38678 Clausthal-ZellerfeldGermany

Phase equilibria involving the long-period stacking ordered phases including 14 H,18 R and 10 H in the Mg-rich corner of the Mg-Y-Zn system at 400 and 500℃ have been experimentally investigated by using X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM).The coexistence of 14 H and 18 R as well as 18 R and 10 H was confirmed from atomic *** phases 14 H,18 R and 10 H were all stable phases from 400 to 500℃.The experimentally proved three-phase equilibrium of14 H,18 R and α-Mg instead of 14 H,18 R and Mg_(24)Y_(5) were presented in the modified isothermal *** latter three-phase equilibrium was reported in the available *** modified isothe rmal sections are conducive to guide the composition design to obtain the alloys with favorable microstructure constituents and mechanical properties.

关键词： Mg-Y-Zn system LPSO phases solubility thermodynamic stability isothermal sections

Incorporation of Dihydroartemisinin into Memantine Through a Propriate Spacer to Make Hybrid with Enhanced Effects to Protect PC12 Cells from Corticosterone-caused Impairments

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2017年第4期33卷 611-622页

作者： ZHANG Lei ZHOU Fan ZHANG Laitao PENG Lizhi guo cuiping LUO Cheng CHEN Heru Institute of Traditional Chinese Medicine and Natural Products College of Pharmacy Jinan University Guangzhou 510632 P. R. China State key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 P. R. China Cruangdong Province Key Laboratory of Pharmacodynamic Constituents ofTCA/I and New Drugs Research Jinan University Guangzhou 510632 P. R. China

Ten memantine（Mema）-dihydroartemisinin（DHA） ligands were designed and synthesized. Three types of isomers including α, β, and a defined y isomer were found in each intermediates（1a--1e）. Type γ isomer was firstly reported here and confirmed as a less stable eclipsed conformation. The bonding of Mema with DHA through different carbon chains generally makes the new entities more cytotoxic than either Mema or artemisinm（Arte）. The β Mema/DHA ligands are a little bit more cytotoxic than a ligands. By applying corticosterone（Cort）-impaired PC12 cells models, it was found that Mema and those ligands with more than 3 carbon chains showed weak or no neuroprotective activities against the insults. However, two ligands, 2a（β） and 2b（β） showed better effects than either Arte or their combination（Mema/Arte in 1：1 molar ratio） at a dose of 5 μmol/L. Furthermore, ligands 2a（β）, 2b（β） and 2c（β） were confn-med as mild N-methyl-D-aspartate（NMDA） antagonists, and their corresponding α isomers are weak NMDA antagonists. All the data indicate that the bonding of Mema/DHA in compacted β conformation mode results in enhanced effects against Cort-induced insults in PC12 ceils and might reverse memantine as an anti-depression NMDA antagonist.

关键词： Artemisinm Memantine Neuroprotection N-Methyl-D-aspartate(NMDA) receptor Depression

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

管氏针灸学术流派的理论体系与临床特色

中华中医药杂志 2024年第9期39卷 4557-4561页

作者：管傲然管薇薇丁丽玲郭翠萍王艳梅王花蕾黄培冬管遵惠昆明市延安医院昆明650051 昆明市中医医院昆明650011 云南中医药大学针灸推拿康复学院昆明650500

管氏针灸学术流派是国家中医药管理局厘定的全国中医学术流派,管氏针灸疗法入选云南省非物质文化遗产名录。文章梳理管氏医学五代传承脉络,论述管氏针灸学术流派的学术思想、传承理念、管氏经络辨证针灸法、管氏针刺手法体系、管氏针灸... 详细信息

管氏针灸学术流派是国家中医药管理局厘定的全国中医学术流派,管氏针灸疗法入选云南省非物质文化遗产名录。文章梳理管氏医学五代传承脉络,论述管氏针灸学术流派的学术思想、传承理念、管氏经络辨证针灸法、管氏针刺手法体系、管氏针灸配穴处方学,阐发管氏针灸学术流派的理论体系。简介管氏舌针疗法、管氏过梁针法、管氏热针疗法、管氏蜂针经穴疗法、管氏子午流注针法、管氏灵龟八法6种特色诊疗技术,阐述管氏针灸的临床特色,展示了管氏针灸学术流派150余年传承概貌。

关键词：管氏针灸学术流派传承脉络理论体系临床特色

Biocompatible, small-sized and well-dispersed gold nanoparticles regulated by silk fibroin fiber from Bombyx mori cocoons

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2019年第2期13卷 126-132页

作者： Chengzhi YANG Shikun CHEN Huilan SU Haoyue ZHANG Jianfei TANG cuiping guo Fang SONG Wang ZHANG Jiajun GU Qinglei LIU State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiaotong University Shanghai 200240 China

Biocompatible, small-sized but well-dispersed gold nanoparticles (Au NPs) remain a major challenge for their synthesis. Here a convenient solution impregnation technique is developed to prepare such Au NPs under the regulation of degummed silk fibroin fibers (SFFs) extracted from Bombyx mori cocoons. SFFs play multiple roles in the formation of Au NPs such as reactive substrate to capture AuCl4^- ions by the chelation of -C = 0, reducing agent for Au(0) by the reduction of -OH , and modifiers to render biocompatible Au NPs by some functional groups and biomolecules. The as-prepared Au NPs with a size of 7-10 nm are embedded in the solid SFF substrate, and can disperse well in the liquid system by the disintegration of SFFs into silk fibroin (SF) in a certain CaCl2 solution. The biocompatible Au NPs exhibit uniform small size and distribute stably in both solid and solution states, which have distinctive properties and functional advantages, and bring great convenience to their storage and transportation.

关键词： Au NPs biocompatibility small size dispersivity silk fibroin fiber

Gene analysis of an antiviral protein SP-2 from Chinese wild silkworm, Bombyx mandarina Moore and its bioactivity assay

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

Science China(Life Sciences) 2008年第10期51卷 879-884页

作者： YAO HuiPeng, HE FangQing, guo AiQin, CAO cuiping, LU XingMeng & WU XiaoFeng College of Animal Science, Zhejiang University, Hangzhou 310029, China College of Animal Science Zhejiang University Hangzhou China

The cDNA encoding an antiviral protein SP-2 against BmNPV was cloned from the midgut of Chinese wild silkworm, Bombyx mandarina Moore (GenBank access AY945210) based on the available informa- tion of the domesticated silkworm. Its cDNA was 855 bp encoding 284 amino acids with predicted mo- lecular weight of 29.6 kDa. Its full length in genomics was 1376 bp, including 5 exons and 4 introns. The expression analysis indicated that it was only expressed in midgut, and its expression level was higher during feeding stage of larval instars while very lower during the moltism and mature stages. The de- duced amino acid sequence of this protein showed eight-amino-acid variation compared with the counterpart of domesticated silkworm. Its antiviral activity was assayed through in vitro test. The re- sults indicated that it showed strong bioactivity against BmNPV, and its activity was 1.6 fold higher that the counterpart of domesticated silkworm.

关键词： Bombyx mandarina Moore antiviral protein bioactivity assay

A thermodynamic re-modeling of the Co-Fe-Gd system

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2012年第10期30卷 1055-1063页

作者：王嵬郭翠萍李长荣杜振民 Department of Materials Science and Engineering University of Science and Technology Beijing School of Chemical Engineering Northeast Dianli University

The Fe-Gd and Co-Fe-Gd systems were optimized by means of the CALPHAD （CALculation of PHAse Diagram） technique. The solution phases, liquid, bcc, fcc and hcp, were described by the substitutional solution model. For the Fe-Gd system, the compounds Fe23Gd6,Fe3Gd and Fe2Gd with no solubility ranges were treated as stoichiometric compounds. According to the CaCu5-type structure of the intermetallic compounds Fe17Gd2,it was reasonable to adopt a three-sulattice model （Fe2,Gd）Gd2Fe15 in the Fe-Gd system, and this model was also adopted as （Co2,Fe2,Gd）（Co2,Gd）2（Co,Fe）15 to describe the compounds （Co,Fe）17Gd2 and （Co,Fe）5Gd in the Co-Fe-Gd ternary system. The other compounds were treated as the line compounds （Co,Fe）mGdn and no ternary compound had been reported in the Co-Fe-Gd system. The thermodynamic description of the Co-Fe and Co-Gd system were taken from literatures. A self-consistent thermodynamic description of the Co-Fe-Gd system was obtained.

关键词： Co-Fe-Gd system CALPHAD technique phase diagram thermodynamic properties rare earths