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Jiaojiao Xi,Jingyun Yu,Zhiqiang Yu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
The characterization of in-plane impact properties of epoxy laminates reinforced with intralayer hybrid carbon/aramid fabrics was investigated. The effects of different fabrics, which had architectures of 2D and 3D form, on the impactperformance was analyzed by drop-weight impact test. It revealed that different braiding styles had a significant influence onthe impact properties. The anti-impact properties were enhanced due to aramid fibers into fabrics, in particular, the fabricswith 3D styles that aramid fibers as the Z-yarns. Laminates reinforced by 3D fabrics containing 25 % aramid fiber presentedoptimal anti-impact performance, and impact peak force and absorbed energy reached 4217 N and 26.71 J, increased by135.5 % and 137.2 % relative to pure carbon fabric system, respectively. The results of damage morphologies showed thatmain damage modes, of fiber kinking, necking and fracture, improved the cushioning effect of laminates, which contributedto the enhancement of impact resistance capacity of composite laminates.
Lightweight, Refractory High-Entropy Alloy, CrNbTa0.25TiZr, with High Yield Strength
Jiaojiao Yi,Lin Yang,Lu Wang,Mingqin Xu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2
A new lightweight, refractory high entropy alloy (HEA), CrNbTa0.25TiZr,was prepared by arc-melting under a vacuumcondition. The as-cast and annealed CrNbTa0.25TiZrpossessed identical dual-phase components: a BCC + a cubic Lavesphase. After annealing, the Laves phase matrix in the as-cast alloy was replaced by the BCC phase, possibly due to the diffusionof Cr, which have a much smaller atomic radius than the other principal elements. From a performance perspective,the yield strength significantly increased from 926 MPa of the as-cast HfNbTaTiZr to 1800 MPa and 1500 MPa for as-castand annealed CrNbTa0.25TiZr,while its density (7.25 g/cm3) is only 73% of HfNbTaTiZr. The microstructure evolution ofthe stiff cubic Laves phase is highlighted to unveil the promising strength of the CrNbTa0.25TiZr.
JIAOJIAO DU,QIANG WANG,GUOJIAN LI,YONGZE CAO,JICHENG HE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
This paper studies the e®ects of a high magnetic feld on the structural evolution and magneticproperties of nanocrystalline Ni flms prepared on quartz substrates by a molecular beam vapordeposition (MBVD) method. Atomic force microscope, X-ray di®ractometer, transmission elecftron microscope and vibrating sample magnetometer were used to study the microstructures andmagnetic properties of the Ni flms. The results indicate that high magnetic feld has no obviousinfluence on crystal structures except changing the lattice constant of the Ni flms. However, thehigh magnetic feld can refne particle size. The flm deposited under magnetic feld tends to growthrough columnar mode because of the magnetized particles aligning along the direction ofmagnetic feld. Furthermore, the ordered and dense arrangement of Ni atoms results in more spinscontained in per unit volume and improves the saturation magnetization (Ms). Ms of the 6 T Ni¯lm increases by 70% (578 emu/cm3) than that of the ¯lm without magnetic ¯eld (341 emu/cm3),and the coercivity is also slightly increased for the 6 T flm.
The POTENTIALITY FOR ACTUALITY Metonymy of Chinese in Comparison to English
Jiaojiao Shi 21세기영어영문학회 2019 영어영문학21 Vol.32 No.1
Panther and Thornburg (1999) exam the POTENTIALITY FOR ACTUALITY in English and Hungarian with the idea of the scenario approach to speech act metonymy. They observe that this metonymy is systematically exploited in both languages though there are some limitations in Hungarian. Based on the idea of Panther and Thornburg (1999), this paper exams the same metonymy in Chinese (Mandarin) and English. The result shows that Chinese also fully exploits the metonymy in seven domains, including sense perception domain, mental state/process domain, hedged performative domain, indirect speech domain, actions domain, character dispositions domain and acquired skills domain. The prevalent use of the metonymy in Chinese confirms the idea that the POTENTIALITY FOR ACTUALITY metonymy is universal, though it violates the cognitive principle ACTUALITY OVER POTENTIALITY.
A Cognitive Semantic Approach to the Polysemy of off
Jiaojiao Shi,최영주 대한영어영문학회 2018 영어영문학연구 Vol.44 No.4
English prepositions have been known to include seemingly heterogeneous and unrelated meanings. Therefore, traditionally, the diverse meanings of a preposition are treated as something to be memorized. However, cognitive semantics considers the meanings of prepositions to be interrelated to each other, and can in fact provide the linguistic motivations in these interconnected relationships. In this paper, based on the cognitive semantics, the seemingly unrelated meanings of off are explained in a more holistic and systematic way. Among different tools of cognitive linguistics, perspectivization is adopted in the analysis of off. The meanings of off are categorized based on which part of the image schema is highlighted. In the image schema of off, a trajector moves from its source to a goal over a path. Depending on which part, among source, goal, and path is highlighted, the basic spatial meaning of off is extended diversely, creating various literal and metaphorical meanings. The result shows that the meanings of off always emphasize the source part of its image schema, unlike the meanings of away whose main emphasis is on the goal part.
Jiaojiao Zheng,Hong Zhang,Tianyu Cao,Yuanyuan Zhu,Lizhong He,Jianwei Li,Xudong Chen,Yinhu Qu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
Superhydrophobic surfaces by creating surface roughness followed by coating with low-surface-energyfluorinated materials have been intensively developed on cotton fabrics. However, exploring superhydrophobic surfaces withnon-fluorine components and further improving their attachment with cotton fabrics is still challenging. Herein, wedeveloped a superhydrophobic surface on cotton fabric by dip coating with hexadecylamine (HDA) modified coppernanowires (Cu NWs) based on the coordination between Cu atoms and amine groups. The HDA modified Cu NWs not onlycreated surface roughness, but also decreased the surface energy, leading to a superhydrophobic cotton fabric with watercontact angle of 164 °±2.0 °. Furthermore, ultrasonic washing and tape peeling tests exhibited the Cu NWs were adheredtightly to the surface of cotton fibers, owing to the strong hydrogen bond between amine groups on HDA molecules andhydroxyl groups on cotton fibers. In addition, the superhydrophobic cotton fabric showed excellent antifouling, oil-waterseparation and infrared reflection properties. It is believed that this facile method provide promising industrial applicationsfor fabricating superhydrophobic surfaces on other substrates.
Jiaojiao Yi,Lin Yang,Lu Wang,Mingqin Xu,Lisha Liu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
A novel 3d transition metal high entropy alloy (TM HEA), CrCuFeTiV, was fabricated by arc-melting under a vacuum condition. Its phase component, microstructure, and compressive properties in the as-cast and annealed conditions were carefullyinvestigated. The experimental results showed that the alloys in both conditions consist of one BCC phase (CrV/FeTi-richregions), one FCC phase (Cu-rich), and one hexagonal Laves phase (Cr2Ti). It is suggested that the CrV-rich BCC phasepreferentially separates as dendritic centers. Subsequently, the Cr2Ti Laves phase and the FeTi-rich BCC phase solidify as adendritic outer layer. Finally, the FCC Cu-rich phase is squashed into the remaining interdendritic regions. Besides, the yieldstrength, ultimate strength, and hardness of the as-cast CrCuFeTiV alloy are 1686 MPa, 2205 MPa, and 624 HV, while thosefor the annealed alloy are 1510 MPa, 2035 MPa, and 618 HV, respectively. The obtained values are the highest among thetabulated fve-principle equiatomic Cu-containing 3d TM HEAs. The promising strength-hardness synergy of CrCuFeTiValloy is likely originated from the majority constitution of the BCC phase and Cr2Ti Laves phase.
Jiaojiao Yi,Lin Yang,Lu Wang,Mingqin Xu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
The phase component, microstructure, and compressive properties of a novel 3d transition metal high entropy alloy, CoCuNiTiV, derived from Fe replaced by V in CoCuNiTiFe alloy, were evaluated in as-cast and annealed conditions. The experiments showed that the as-cast alloy possessed a typical BCC+FCC dual-phases, which distinctly varied from the singleFCC phase of an adjacent CoCuNiTiFe alloy. The BCC phase takes up the majority acting as the matrix, in which Cu wasdepleted, and the other elements (i.e., Co, Ni, Ti, and V) were distributed homogenously. Meanwhile, the FCC phase wasCu-rich, and sandwiched in the interval space between the BCC phases forming a net-like framework. After annealing, thematrix bifurcated into two parts: (i) one that remained as the primary BCC phase and (ii) another that decomposed into aCo2Ti-type laves phase and a new BCC phase. Meanwhile, the Cu-rich net-like framework is deteriorated forming a seriesof evenly distributed particles. The yield strength and the fracture strength of the as-cast and annealed alloy are highlysimilar— about 1674 and 2400 MPa, respectively. The hardness of the annealed alloy (572.9±10.6 HV) was slightly higherthan that of the as-cast alloy (530.3±12.2 HV).