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Effect of Filter Parameters on a Supercontinuum-Based All-Optical Tunable Thresholder
Huatao Zhu,Rong Wang,Tao Pu,Tao Fang,Peng Xiang,Huihui Zhu 한국광학회 2016 Current Optics and Photonics Vol.20 No.4
In this paper, the effects of filter parameters on a supercontinuum-based all-optical thresholder areexperimentally investigated. By tuning the filter parameters, the power transfer function and powertransmission function are tailored. The experimental results show that a thresholder with short centerwavelength has a better power function, and the slope in the middle level of the thresholder increaseswith increasing bandwidth. Through tuning the filter parameters, the thresholder can achieve a steplikepower transfer function for optical thresholding, and a steplike power transmission function for opticalself-switching. This makes the supercontinuum-based thresholder more flexible, and allows customizationof performance to meet different demands in various applications.
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Xiaosheng Liu,Meng Zhang,Huatao Hu,Zhaowei Li,Xuefeng Xu,Yi Wang,Zhenhai Han 한국원예학회 2024 Horticulture, Environment, and Biotechnology Vol.65 No.3
Drought is one of the major abiotic stresses that limits apple production. Rootstocks provide roots for grafted fruit trees. The rootstocks absorb water and mineral nutrients and aff ect the growth and development of the tree and the quality of fruit and its yield. Furthermore, the appropriate rootstock for drought conditions is key to the sustainable production of apple ( Malus spp.). Chistock #1 is a new semi-dwarfi ng apple rootstock. The drought tolerance of Chistock #1 was compared with that of M9, M26 and M. prunifolia through pot and fi eld experiments. In pot experiments, drought tolerant rootstocks were selected by comparing the root confi guration, leaf anatomical structure, electrical conductivity and SPAD value. The results showed that the roots of Chistock #1 and M. prunifolia were long and well developed. Under drought stress, M. prunifolia can close its stomata in time to reduce water loss, followed by Chistock #1 and M26, while M9 was the slowest at closing its stomata. After drought treatment, the leaf and palisade tissue thickness and SPAD value of Chistock #1 were the highest at 121.56 μm, 42.03 μm and 43.00 μm, respectively. The fruit yield and quality of diff erent scion and rootstock combinations were measured in fi eld experiments. A Fuji scion cultivar grafted to Chistock #1 had a higher yield and better quality as determined by its suitable ratio of total soluble solids and titratable acid. Finally, a membership function combined with a principal component analysis was used to comprehensively evaluate the drought tolerance of the four rootstocks. The results were as follows: Chistock #1 was the most drought tolerant of the four rootstock genotypes, M. prunifolia and M26 were the second and third most drought tolerant rootstocks, while M9 was the least drought tolerant.
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Zhipeng Xie,Weiyou Yang,Zhenkun Fan,Huatao Wang,Hezhuo Miao,Linan An 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.4
Si3N4/SiC nanocomposites were fabricated by spark plasma sintering (SPS) of amorphous SiCN ceramic powders derived from a polymeric precursor with 3 wt% yttria as an additive. It was found that the SPS parameters, such as sintering temperature, dwell time, pressure and heating rate, remarkably affected the density and grain size of the nanocomposites obtained. This provided a new method to fabricate Si3N4/SiC nanocomposites without applying the high pressure and high sintering temperature used by the conventional process. Si3N4/SiC nanocomposites were fabricated by spark plasma sintering (SPS) of amorphous SiCN ceramic powders derived from a polymeric precursor with 3 wt% yttria as an additive. It was found that the SPS parameters, such as sintering temperature, dwell time, pressure and heating rate, remarkably affected the density and grain size of the nanocomposites obtained. This provided a new method to fabricate Si3N4/SiC nanocomposites without applying the high pressure and high sintering temperature used by the conventional process.
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