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RISS 인기검색어
- 검색키워드
- 저자 : Guoxing Qiu (검색결과 5 건)
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Guoxing Qiu,Dongping Zhan,Changsheng Liu,Min Qi,Zhouhua Jiang,Huishu Zhang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5
The effects of Y and Ti on the microstructure stability and tensile properties of the reduced activationferritic/martensitic steel have been investigated. The addition of Y and Ti affected the prior austenitegrain size due to the pinning of the inclusions. Ti addition of 0.008 wt% to the steel was intended topromote the precipitation of nano-sized carbides with a high resistance to coarsening. 8Ti14Y exhibited ahigher yield strength and a lower DBTT than the other alloys due to the fine grain size and additionalprecipitation hardening by (Ti, Ta)-rich MX. After thermal exposure at 550 C for 1500 h, yield strengthwas dropped significantly in exposed 0Ti13Y. On the contrary, a lower reduction of YS was observed in8Ti14Y. The M23C6 in 0Ti13Y and 8Ti14Y and MX in 25Ti14Y and 39Ti15Y coarsened seriously duringageing, which could be responsible for the reduction of the tensile properties of alloys.
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Guoxing Qiu,Dongping Zhan,Changsheng Liu,Min Qi,Zhouhua Jiang,Huishu Zhang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.6
In this paper, the CLAM steel strengthened by micro-scale YeZreO was prepared by vacuum inductionmelting followed by electroslag remelting (VIM-ESR). Yttrium (Y) and zirconium (Zr) were easy to aggregatesinto massive yttrium-zirconium-rich inclusions in the steel melted by vacuum inductionmelting (VIM), which would interrupt the continuity of the matrix and reduce the mechanical propertiesof steel. Micron-sized YeZreO inclusions would be produced with the removal of original blocky YeZrrichinclusions and the submicron-sized inclusions smaller than 0.2 mm could be retained in the steel. The small grain size and the better refinement and distribution uniformity of YeZreO inclusions afterremelting would be responsible for the better yield strength and toughness. For VIM-ESR alloy, the ultimatetensile strength is 749 MPa and the yield strength is 642 MPa at room temperature, meanwhilethey are 391 MPa and 367 MPa at 600 C, respectively. Meanwhile, the ductile-brittle transition temperature(DBTT) reduced from 43 C (VIM) to-76 C (VIM-ESR).
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Qiu, Guoxing,Zhan, Dongping,Li, Changsheng,Yang, Yongkun,Jiang, Zhouhua,Zhang, Huishu Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.4
Y-containing CLAM steels were melted via vacuum induction melting and electroslag remelting. In this study, the evolution, microstructure, and mechanical properties of the alloy inclusions (ESR-1 (0 wt.% Y), ESR-2 (0.016 wt.% Y) and ESR-3 (0.042 wt.% Y)) were investigated. Further, the number of inclusions in ESRed steel was observed to obviously decrease, and the distributions were more uniform. The fine Y-Al-O inclusions (1-2 ㎛) were the main inclusions in ESR-2. The addition of Y affected the prior austenite grain size (PAGZ), increasing the tensile strength at test temperature. Low ductile-brittle transition temperature (DBTT) was obtained because of the fine PAGZ and dispersive inclusions. For the ESRed CLAM steel with 0.016 wt.% Y, the yield strengths were 621 MPa at 20 ℃ and 354 MPa at 600 ℃ in air. Further, the uniform elongation and elongation of the ESR-2 alloy were 5.5% and 20.1% at 20 ℃, respectively. Meanwhile, the DBTT tested using full-size Charpy impact specimen (55 cm × 10 cm × 10 cm) was reduced to -83 ℃.
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Dielectric Meta-Holograms Enabled with Dual Magnetic Resonances in Visible Light
Li, Zile,Kim, Inki,Zhang, Lei,Mehmood, Muhammad Q.,Anwar, Muhammad S.,Saleem, Murtaza,Lee, Dasol,Nam, Ki Tae,Zhang, Shuang,Luk’yanchuk, Boris,Wang, Yu,Zheng, Guoxing,Rho, Junsuk,Qiu, Cheng-Wei American Chemical Society 2017 ACS NANO Vol.11 No.9
<P>Efficient transmission-type meta-holograms have been demonstrated using high-index dielectric nanostructures based on Huygens principle. It is crucial that the geometry size of building blocks be judiciously optimized individually for spectral overlap of electric and magnetic dipoles. In contrast, reflection-type meta-holograms using the metal/insulator/metal scheme and geometric phase can be readily achieved with high efficiency and small thickness. Here, we demonstrate a general platform for design of dual magnetic resonance based meta-holograms based on the geometric phase using silicon nanostructures that are quarter wavelength thick for visible light. Significantly, the projected holographic image can be unambiguously observed without a receiving screen even under the illumination of natural light. Within the well-developed semiconductor industry, our ultrathin magnetic resonance-based meta-holograms may have promising applications in anticounterfeiting and information security.</P>
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Full-space Cloud of Random Points with a Scrambling Metasurface
Li, Zile,Dai, Qi,Mehmood, Muhammad Q.,Hu, Guangwei,yanchuk, Boris Luk’,Tao, Jin,Hao, Chenglong,Kim, Inki,Jeong, Heonyeong,Zheng, Guoxing,Yu, Shaohua,Alù,, Andrea,Rho, Junsuk,Qiu, Cheng-Wei Nature Publishing Group UK 2018 Light, science & applications Vol.7 No.1
<▼1><P>With the rapid progress in computer science, including artificial intelligence, big data and cloud computing, full-space spot generation can be pivotal to many practical applications, such as facial recognition, motion detection, augmented reality, etc. These opportunities may be achieved by using diffractive optical elements (DOEs) or light detection and ranging (LIDAR). However, DOEs suffer from intrinsic limitations, such as demanding depth-controlled fabrication techniques, large thicknesses (more than the wavelength), Lambertian operation only in half space, etc. LIDAR nevertheless relies on complex and bulky scanning systems, which hinders the miniaturization of the spot generator. Here, inspired by a Lambertian scatterer, we report a Hermitian-conjugate metasurface scrambling the incident light to a cloud of random points in full space with compressed information density, functioning in both transmission and reflection spaces. Over 4044 random spots are experimentally observed in the entire space, covering angles at nearly 90°. Our scrambling metasurface is made of amorphous silicon with a uniform subwavelength height, a nearly continuous phase coverage, a lightweight, flexible design, and low-heat dissipation. Thus, it may be mass produced by and integrated into existing semiconductor foundry designs. Our work opens important directions for emerging 3D recognition sensors, such as motion sensing, facial recognition, and other applications.</P></▼1><▼2><P><B>Metasurfaces: scrambling light for 3D detection and recognition</B></P><P>Firing light at a manufactured 'metasurface'—one carrying patterns at a smaller scale than the wavelength of the light—fills large volumes of space with defined points of light, potentially improving 3-D recognition and sensor applications. Cheng-Wei Qui and colleagues at the National University of Singapore, with co-workers across Asia and in the USA, created their unique metasurface from amorphous silicon. Light is scattered from and transmitted through the material to generate a cloud of data points in the surrounding space in which the structure and motion of objects under study can be analyzed. The initial development work with this “scrambling metasurface” suggests it could improve pattern recognition, including face recognition, motion detection and augmented reality applications. The researchers describe how their innovation overcomes significant limitations of existing methods in these fields.</P></▼2>
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