检索结果-南通市图书馆

Effects of recrystallization on the low cycle fatigue behavior of directionally solidified superalloy DZ40M

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第4期27卷 425-428页

作者： zhao yang WANG Lei li Hongyun YU Teng liU yang Key Laboratory of the Ministry of Education of China for Anisotropy and Texture of Materials Northeastern University Shenyang 110004 China

The effects of recrystallization on low cycle fatigue behavior were investigated on directionally solidified Co-base superalloy DZ40M. Optical microscopy and SEM were used to examine the microstructure and fracture surface of the specimens. The mechanical testing results demonstrated that the low cycle fatigue property of DZ40M significantly decreased with the partial recrystallization. Fatigue cracks initiate near the carbides and the grain boundaries with slip-bands. Both the fatigue crack initiation and propagation can be accelerated with the occurrences of recrystallized grain boundaries.

关键词： Co-base superalloy low cycle fatigue recrystallization crack initiation crack propagation

STUDY OF DYE-SENSITIZED SYSTEMS FOR PHOTOIMAGING

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2001年第1期19卷 79-83页

作者： Fang Gao Chun-ying zhao Yong-yuan yang li-dong li Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China

o-Chloro-hexaarylbiimidazole (o-CI-HABI) can be sensitized efficiently by cyanine dyes, the cyclopentanone and cyclohexanone dyes, when exposed to xenon lamp (use filter cut lambda less than or equal to 400 nm). The photoreaction between the photoinitiator and the dyes was completed through an electron transfer process. Excellent results have been obtained in photoimaging studies, e.g. the resolution of the image can reach 7 mum. The influence of the content of the dyes and the heat after the exposure on the resolution of the image was investigated.

关键词： photopolymer photoimaging hexaarylbiimidazole printing plate

Geochemistry of the limahe Intrusion in the Panxi District, SW China:Discussion on the Relationship to the Emeishan Basalts

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 Geologica Sinica(English Edition) 2008年第1期82卷 105-116页

作者： li Ying ZHANG zhaochong AI Yu zhao li yang Tiezheng State Key Laboratory of Processed and Mineral Resources China University of Geoscinces Beijing 100083 China

The limahe intrusion is a typical rock hosting Cu-Ni sulfide deposit in the Panxi district. The major element, trace element and Sr-Nd isotopic geochemical data are reported in this study both firstly and systemically. Age-corrected （87Sr/86Sr） and εNd（t） isotope values, ranging from 0.687062 to 0.709298, from -0.6 to -4.13 respectively, are partly overlap the field of the Emeishan basalt and OIB, and they lie between upper crust and OIB generally. The similar patterns between the limahe intrusion and the picrites of the Emeishan large igneous province imply the genetic relationship to the Emeishan basalts. Their lower Nb/U （〈30）, higher （La/Nb）pM and （Th/Ta）pM ratio values （〉1） indicate contamination of the upper crust material. The correlation between MgO and major oxides reflects the fractional crystallization of olivine, clinopyroxene and minor plagioclase in the deep-seated chamber. Therefore increased SiO2 and lowered FeO by the upper crustal contamination may trigger immiscible sulfide melt, which then flowed along the structural fracture and intruded into gabbrodiorite, resulting in the formation of Cu-Ni sulfide orebody.

关键词： assimilation geochemistry mafic-utramafic intrusions limahe Panxi district

Zr_(55)Al_(10)Ni_(5)Cu_(30)amorphous alloy film prepared by magnetron sputtering method

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第8期40卷 2237-2243页

作者： Dong-Mei Mi Sheng-li Zhu Yan-Qin liang zhao-yang li Zhen-Duo Cui Xian-Jin yang Akihisa Inoue School of Materials Science and Engineering Tianjin UniversityTianjin300072China Tianjin Key Laboratory of Composite and Functional Materials Tianjin300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin300072China Department of Physics Kings Abudulaziz UniversityJeddah22254Saudi Arabia

In this work,amorphous Zr_(55)Al_(10)Ni_(5)Cu_(30)alloy thin film was prepared on D36 steel substrate by magnetron sputtering *** film was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),atomic force microscopy(AFM),hardness tester and nano *** behavior of the film was investigated in 3.5%NaCl aqueous solutions by an electrochemical *** room temperature,the amorphous alloy film was formed completely after sputtering for 5 *** surface morphology of the amorphous alloy film was uniform and *** of the amorphous alloy film improved the microhardness and corrosion resistance of the D36 *** amorphous alloy film(prepared at room temperature for 5 h)exhibited good adhesion strength with the *** as-sputtered sample exhibited a crevice corrosion trend when the sputtering time was too short(1 h)or too long(10 h).

关键词： Magnetron sputtering Amorphous alloy Thin film Corrosion resistance Zr_(55)Al_(10)Ni_(5)Cu_(30)

Lanthanide-Hypophosphite Frameworks with Guanidinium Guest Showing High Proton Conductivity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2021年第12期39卷 3381-3385页

作者： Quan-Wen li zhao-yang li Kai li Bin Xia Na li Xian-He Bu School of Materials Science and Engineering National Institute for Advanced MaterialsTianjin Key Laboratory of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin 300350China State Key Laboratory of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

Proton-conductive metal-organic frameworks(MOFs)have attracted great attention for their promising application in membrane fuel *** explore proton-conductive MOFs with high performance,here we present four lanthanide-hypophosphite frameworks with distinct amine *** complexes possess a general formula[AH][Gd_(2)(H_(2)PO_(2))_(7)(AH=protonated amines)].Due to the rich hydrogen bond networks,complex 1 with guanidinium as guest shows high proton conductivity of 1.75×10^(-2) S·cm^(-1) at a relative humidity of 97%(368 K).We also studied the magnetic properties of complex 1 and reveal that the hypophosphite ligand transfers weak antiferromagnetic interactions between Gd^(3+)ions.

关键词： Lanthanides Hypophosphite Metal-organic frameworks Proton transport Magnetic properties

Flower-like CuS/graphene oxide with photothermal and enhanced photocatalytic effect for rapid bacteria-killing using visible light

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

Rare Metals 2022年第2期41卷 639-649页

作者： Rui Lv Yan-Qin liang zhao-yang li Sheng-li Zhu Zhen-Duo Cui Shui-linWu School of Materials Science&Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin 300072China The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China Tianjin UniversityTianjin 300072China

Pathogenic bacteria have been threatening the daily life of human *** effective methods without causing drug-resistance of bacteria need to be developed to fight against these ***,flower-like CuS/-graphene oxide(GO)hybrids have been successfully synthesized via simple one-pot hydrothermal *** worked as an excellent electron acceptor to transport the photogenerated electrons from CuS,which can suppress the recombination of hole–electron pairs efficiently,thus enhancing the photocatalytic *** addition,the morphology of CuS and GO with high specific surface area and the increased defect in GO also improved photocatalytic performance of the *** to the synergy of photothermal,enhanced photocatalytic effect and released Cu ions,CuS/GO exhibited outstanding antibacterial efficacy under visible light irradiation for 15 ***,the hybrid showed great biocompatibility to L929 ***,the synthesized CuS/GO would be a promising antibacterial material for daily life including rapid water disinfection and wounds sterilization.

关键词： Antibacterial Photocatalytic CuS Graphene oxide Photoresponsive

CaY-zeolite Catalyzed Etherification and Alkylation of Substituted Benzyl Alcohols

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第1期17卷 15-18页

作者： Wei YU Miao WEN Guang Yu zhao li yang Zhong li liU National Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000

The reaction of p- and/ α-subtituted benzyl alcohols in CaY-zeolite produced the corresponding dibenzyl ethers and/or benzyl toluenes as the principal products.

关键词： Benzyl alcohols CaY-zeolite etherification alkylation.

Preparation and Characterization of Microcapsules for Self-healing Materials

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第3期26卷 496-500页

作者： liAO Le-ping ZHANG Wei zhao yang li Wu-Jun National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 P. R. China

The urea-formaldehyde（UF） capsules filled with a healing agent, a mixture of epoxy resins（epoxy 711 and E-51） as core material, were produced by means of one step in-situ polymerization. The characteristics of these microcapsules were studied via scanning electron microscopy（SEM）, particle size analysis, FTIR and DSC/TGA. The results show that the dispersed and integrated microcapsules of 5 μm in shell thickness were synthesized successfully. The capsules were produced with diameters ranging from 10 to 250 μm via controlling agitation rate. Young＇s modulus of the capsule was a little lower than those of the epoxy resins, but the microcapsules having such a shell thickness were robust enough to survive handling during manufacturing self-healing composites. When damage occurred in the epoxy matrix, the crack could rupture the microcapsule to make the repairing agent release.

关键词： Urea-formaldehyde Microcapsule Epoxy resin Self-healing

Two-stage approach to full Chinese parsing

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2005年第4期11卷 359-363页

作者：曹海龙 zhao Tiejun yang Muyun li Sheng MOE-MS Key Laboratory of Natural Language Processing and Speech Harbin Institute of Technology Harbin 150001 P.R. China

Natural language parsing is a task of great importance and extreme difficulty. In this paper, we present a full Chinese parsing system based on a two-stage approach. Rather than identifying all phrases by a uniform model, we utilize a divide and conquer strategy. We propose an effective and fast method based on Markov model to identify the base phrases. Then we make the first attempt to extend one of the best English parsing models i.e. the head-driven model to recognize Chinese complex phrases. Our two-stage approach is superior to the uniform approach in two aspects. First, it creates synergy between the Markov model and the head-driven model. Second, it reduces the complexity of full Chinese parsing and makes the parsing system space and time efficient. We evaluate our approach in PARSEVAL measures on the open test set, the parsing system performances at 87.53% precision, 87.95% recall.

关键词： natural language processing systems parsing markov model pattern recognition