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Science China(Technological Sciences) 2019年第11期62卷 2009-2013页

作者： PAN Chunjiao GAO TengHua ITOGAWA Nobuhide HARUMOTO Takashi ZHANG ZhengJun NAKAMURA Yoshio SHI ji School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China School of Materials and Chemical Technology Tokyo Institute of TechnologyTokyo 152-8552Japan Department of Applied Physics and Physico-Informatics Keio UniversityYokohama 223-8522Japan

Perpendicular magnetic anisotropy and perpendicular exchange bias of CoPt/FeMn bilayers fabricated by dc magnetron sputtering were investigated in this *** anisotropy,showing strong dependence on thickness of CoPt layer,changes from perpendicular magnetic anisotropy(PMA) into in-plane magnetic anisotropy when CoPt layer is thicker than 4.5 *** evolution of internal stress with thickness,from tensile to compressive,has been analyzed by sin^2 ψ method using an equal biaxial stress *** perpendicular exchange bias(PEB) has been successfully established due to PMA of CoPt and out-ofplane spin component of 3 Q-spin-structured *** thickness dependence of exchange bias field has been systematically investigated.

关键词： perpendicular magnetic anisotropy perpendicular exchange bias X-ray technique magnetic materials

Influence of Nb addition on microstructural evolution and compression mechanical properties of Ti-Zr alloys

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Journal of Materials Science & Technology 2021年第10期69卷 7-14页

作者： Pengfei ji Bohan Chen Bo Li Yihao Tang Guofeng Zhang Xinyu Zhang Mingzhen Ma Riping Liu State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004China

In order to expand the application horizon of Ti-Zr based alloys,the influence of Nb content on phase composition,microstructural evolution and biomechanical properties is systematically *** phase and microstructural characterization of the as-cast alloys is carried out by X-ray diffraction,optical microscopy and transmission electron *** results reveal that Nb-containing Ti-Zr alloys transformed from single a phase→α+α"+β phase single β phase double β phases with increasing Nb *** the case of β-type alloys,the addition of Nb improves the bonding energy between atoms,reduces the grain size,increases the elastic modulus,improves the yield strength and renders superior work-hardening ***,the current study provides mechanistic insights into microstructural evolution and strengthening of Nb-containing Ti-Zr alloys with increasing Nb ***,the addition of 5 at.% Nb resulted in an abnormal work hardening during compression deformation under the synergistic influence of stress-induced martensite transformation of β phase and stress-induced twinning of α ***,the biomechanical properties are evaluated to demonstrate the potential of Nb-containing Ti-Zr alloys in biological applications.

关键词： Ti-Zr based alloy Biomaterials Microstructural evolution Mechanical properties

Spermidine-induced two-dimensional DNA condensations on mica surfaces:A different pathway from condensations in solution

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Chinese Science Bulletin 2009年第14期54卷 2425-2433页

作者： ZHANG XingHua HOU XiMiao ji Chao LIMing DOU ShuoXing WANG PengYe Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

With atomic force microscopy (AFM) we systematically studied the DNA condensations on mica surfaces induced by multivalent cation spermidine. The pattern of the DNA condensates is a flat single layer, with a core in the centre and DNA wrapping around it at high density. We assume this to be a two-dimensional condensation of free coiled DNA onto negatively charged mica surfaces by the multivalent cation. The DNA molecules condense on mica surfaces via a pathway different from the formation of toroids, rods or globules in bulk solutions. We give an explanation to why toroid structures are difficult to be observed by AFM, and further discuss the relationship between DNA condensations in solutions and on mica surfaces. The present work will be helpful for understanding the behaviors of DNA on charged surfaces, which might be significantly different from that in solutions.

关键词： DNA分子表面云母诱导亚精胺原子力显微镜多价阳离子溶液

Digital management technology and its application to investment casting enterprises

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China Foundry 2016年第5期13卷 301-309页

作者： Xiao-yuan ji Hu Ye jian-xin Zhou Wei-lin Deng State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science & Technology

With the advent of Industry 4.0, more and more investment casting enterprises are implementing production manufacturing systems, especially in the last two years. This paper summarizes three new common requirements of the digital management aspect in precision casting enterprises, and puts forward three corresponding techniques. They are: the production process tracking card technology based on the main-sub card mode; the workshop site production process processing technology based on the barcode; and the equipment data integration technology. Then, this paper discusses in detail the principle, application and effect of these technologies; to provide the reference for enterprises to move towards digital casting and intelligent casting.

关键词： investment casting digital management task driven main-sub card workshop site processing data integration

Synthesis of cis-(±)-2-Hydroxymethyl-5-(Cytosine-1'-yl)-1,3-Oxathiolane (BCH-189)

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Chinese Chemical Letters 2001年第6期12卷 487-488页

作者： ji Zhen LI Xue Peng QIU Lian Xun GAO Meng Xian DING Polymer Chemistry Laboratory Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022

The target compound BCH-189 was synthesized with high yield via four steps from benzoyloxy acetylaldehyde and p-dithiane-2,5-diol as starting materials. The synthetic route is preferable to what literature reported.

关键词： Anti-HIV total synthesis BCH-189

The Devonian-Carboniferous Boundary in Shallow-Water Facies Areas of China as Based on Conodonts

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Acta Geologica Sinica(English Edition) 1987年第1期61卷 11-22+116-117页

作者： ji Qiang Chinese Academy of Geological Sciences, Beijing Chinese Academy of Geological Sciences Beijing

Traditionally, the lower boundary of the Aikuanian(Yanguanian) Stage has always been considered as the lower boundary of the Carboniferous in China. marked by the occurrence of the coral *** recent years, some biostratigraphical research results have shown that the Cystophrentis zone is only distributed in the lower part of the Menggong’ao Formation(or the Gelaohe Formation) and that there is an interval zone namely the Cystophrentis-Pseudouralinia interval zone, wedged in just between the Cystophrertis zone and the Pseudouralinia zone in the upper part of the Menggong’ao Formation(or the GelaoheFormation). According to the current study of the conodont biostratigraphy, the coral Cystophrentis zone appears to be of latest Devonian age. So the lower boundary of the Aikuanian Stage is much lower than the lower Devonian-Carboniferous boundary and should no longer be regarded as the lower boundary of the Carboniferous in China. In this paper, two proposals for the Devonian-Carboniferous boundary in the shallow-water facies areas of China are put forward: 1) that the boundary is marked by the first appearance of the conodont Siphonodella(Eosiphonodella) simplex, and 2) that the boundary is recognized by the extinction of the coral Cystophrentis or the brachiopod *** addition, 4 species are newly estabished here: Icriodus obovatus sp. nov., Polygnathus lepidus sp. nov., Polygnathus paucidentatus sp. nov. and Polylophodonta jianghuaensis sp. nov.

关键词： Ca The Devonian-Carboniferous Boundary in Shallow-Water Facies Areas of China as Based on Conodonts

Phase equilibrium of the ternary system of NH_(4)Cl—CaCl_(2)—H_(2)O at 50℃

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Frontiers of Chemical Science and Engineering 2010年第1期4卷 75-77页

作者： Xia LI Junsheng YUAN Zhiyong ji jianxin CHEN Hebei University of Technology Tianjin 300130China Engineering Research Center of Seawater Utilization Technology Ministry of EducationTianjin 300130China

The equilibrium data on the ternary system of NH_(4)Cl-CaCl_(2)-H_(2)O at 50℃were investigated using the wet-residue *** experimental results show that there are three pure phase crystal areas of NH_(4)Cl,2NH_(4)Cl·CaCl_(2)·3H_(2)O and CaCl·2H_(2)O,two mixture phase crystal areas of NH_(4)Cl and 2NH_(4)Cl·CaCl·3H_(2)O,and 2NH_(4)Cl·CaCl_(2)·3H_(2)O and CaCl·2H_(2)O in the system.A new hydration double salt(2NH_(4)Cl·CaCl·3H_(2)O)was found in the ternary equilibrium system for the first time.

关键词： calcium chloride ammonium chloride phase equilibrium

The study of methanol aromatization on transition metal modified ZSM-5 catalyst

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1949-1953页

作者： Keming ji jiayao Xun Ping Liu Qingwen Song Junhua Gao Kan Zhang jingyuan Li State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences

In this article, transition metals of Cu, La and Zn were used as adjuvant to prepare modified HZSM-5 by impregnation method. The catalysts were characterized by XRD, BET, NH_3-TPD and Py-IR to reveal the microstructure and acid property. The catalysis performances of methanol aromatization of catalysts were investigated in a fixed-bed reactor. The results show that the strength and distribution of acid center of these catalysts are significantly influenced by the species of transition metal. There are more mediate strong Lewis acid center in Zn modified HZSM-5 catalyst and therefore exhibits higher selectivity to aromatic, benzene, toluene and xylenes in the MTA reaction..

关键词： Aromatization ZSM-5 Metal modified

Study on the Simultaneously Quantitative Detection for β-Lactoglobulin and Lactoferrin of Cow Milk by Using Protein Chip Technique

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Biomedical and Environmental Sciences 2017年第12期30卷 875-886页

作者： YIN ji Yong HUO Jun Sheng MA Xin Xin SUN jing HUANG jian National Institute for Nutrition and Health Chinese Center for Disease Control and Prevention Beijing 100050China

Objective To research a protein chip method which can simultaneously quantitative detect β-Lactoglobulin （β-L） and Lactoferrin （Lf） at one time. Methods Protein chip printer was used to print both anti-β-L antibodies and anti-Lf antibodies on each block of protein chip. And then an improved sandwich detection method was applied while the other two detecting antibodies for the two antigens were added in the block after they were mixed. The detection conditions of the quantitative detection for simultaneous measurement of β-L and Lf with protein chip were optimized and evaluated. Based on these detected conditions, two standard curves of the two proteins were simultaneously established on one protein chip. Finally, the new detection method was evaluated by using the analysis of precision and accuracy. Results By comparison experiment, mouse monoclonal antibodies of the two antigens were chosen as the printing probe. The concentrations of β-L and Lf probes were 0.5 mg/mL and 0.5 mg/mL, respectively, while the titers of detection antibodies both of β-L and Lf were 1：2,000. Intra- and inter-assay variability was between 4.88% and 38.33% for all tests. The regression coefficients of protein chip comparing with ELISA for β-L and Lf were better than 0.734, and both of the two regression coefficients were statistically significant （r = 0.734, t = 2.644, P = 0.038; and r = 0.774, t = 2.998, P = 0.024）. Conclusion A protein chip method of simultaneously quantitative detection for β-L and Lf has been established and this method is worthy in further application.

关键词： Protein chip Simultaneously Quantitative detection β-Lactoglobulin Lactoferrin

Two new brominated diterpenes from Laurencia decumbens

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Chinese Chemical Letters 2007年第8期18卷 957-959页

作者： Nai Yun ji Xiao Ming Li Chuan Ming Cui Bin Gui Wang Key Laboratory of Experimental Marine Biology Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

Two new brominated diterpenes, namely, laurendecumtriol and 11-deacetylpinnaterpene C, were isolated and identified from the marine red alga Laurencia decumbens. Their structures were established on the basis of vario... 详细信息

关键词： Laurencia decumbens Diterpene Laurendecumtriol 11-Deacetylpinnaterpene C