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RISS 인기검색어
- 검색키워드
- 저자 : Z.R. Shu (검색결과 3 건)
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Quantitative assessment of offshore wind speed variability using fractal analysis
Z.R. Shu,P.W. Chan,Q.S. Li,Y.C. He,B.W. Yan 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.31 No.4
Proper understanding of offshore wind speed variability is of essential importance in practice, which provides useful information to a wide range of coastal and marine activities. In this paper, long-term wind speed data recorded at various offshore stations are analyzed in the framework of fractal dimension analysis. Fractal analysis is a well-established data analysis tool, which is particularly suitable to determine the complexity in time series from a quantitative point of view. The fractal dimension is estimated using the conventional box-counting method. The results suggest that the wind speed data are generally fractals, which are likely to exhibit a persistent nature. The mean fractal dimension varies from 1.31 at an offshore weather station to 1.43 at an urban station, which is mainly associated with surface roughness condition. Monthly variability of fractal dimension at offshore stations is well-defined, which often possess larger values during hotter months and lower values during winter. This is partly attributed to the effect of thermal instability. In addition, with an increase in measurement interval, the mean and minimum fractal dimension decrease, whereas the maximum and coefficient of variation increase in parallel.
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Semi-Empirical Study on the Yield Energy-Dependence of the ^(235) U + n Fission
N.-C Shu,Y. -J Chen,T. -J Liu,Z. -J Sun,X. -Z Wu,J. Qian,R. -R Xu 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The yield dependence on energy of ^(235)U+n fission was studied with semi-empirical mode based upon the basic idea of Brosa model, wherein the macro energy and the shell effects were taken into account at scission. And the yield could be expressed with a five-gaussian formula formally with 11 parameters, which were determined by fitting experimental data. The results showed it could well describe the yield mass distributions and the yield energy-dependance of part fragments in the incident energy range 0 - 20 MeV.
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Optical Nanostructures Fabricated by SU-8 based Nanoimprint Lithography
R. Liu,B.-R. Lu,S.-Q. Xie,J. Wan,Z. Shu,X.-P. Qu,Y. Chen 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
The high resolution low-cost and high-volume nano-pattering capability of the nanoimprint lithography (NIL) and the high optical transmittance of SU-8 in the infrared, the visible and the near-UV light ranges have enabled us to apply the SU-8 based NIL to produce various optical nanostructures. We fabricated dielectric and metallic gratings of various groove density (1000 – 5000 lines/mm) in a relatively large area (10 mm × 10 mm) and planar chiral photonic meta-material structure in SU-8 with periods of both 600 nm and 4 μm. We also designed and successfully fabricated distributed Bragg reflectors (DBRs) with Si/SiO2/SU8/air structures Optical measurements of the SU-8 based nanostructures showed good optical performance and interesting properties, and the experimental data agree reasonably well with simulation results. The high resolution low-cost and high-volume nano-pattering capability of the nanoimprint lithography (NIL) and the high optical transmittance of SU-8 in the infrared, the visible and the near-UV light ranges have enabled us to apply the SU-8 based NIL to produce various optical nanostructures. We fabricated dielectric and metallic gratings of various groove density (1000 – 5000 lines/mm) in a relatively large area (10 mm × 10 mm) and planar chiral photonic meta-material structure in SU-8 with periods of both 600 nm and 4 μm. We also designed and successfully fabricated distributed Bragg reflectors (DBRs) with Si/SiO2/SU8/air structures Optical measurements of the SU-8 based nanostructures showed good optical performance and interesting properties, and the experimental data agree reasonably well with simulation results.
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