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Precisely controlled preparation of uniform nanocrystalline cellulose via microfluidic technology
Shuxiu Wang,Jinsong Zeng,Zheng Cheng,Zhe Yuan,Xiaojun Wang,Bin Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
As a new type of biomass-based molecular material, nanocrystalline cellulose (NCC) has become aresearch hotspot in many fields. In present work, a novel microfluidic technology was employed to produceNCC from microcrystalline cellulose (MCC) via sulfuric acid hydrolysis. The microfluidic chip wasdesigned and made with complete load-bearing reaction according to flow characteristics. A closed reactionenvironment and fully automated operations can ensure the safety of experimenters. NCC (MN-60)with high yield and uniformity was obtained via acid hydrolysis in microfluidic system by 60 % sulfuricacid solution at 35 C for 40 min. The characteristics of MN-60 and conventional method NCC (N-60)under the same reaction conditions were compared. It was found that the yield of MN-60 reached48.13%, while it was only 17.30 % in the absence of microfluidic chip. Although the results showed thatMN-60 and N-60 exhibited similar rod-like structures, the size distribution of MN-60 was narrower thanthat of N-60. Furthermore, the width, length, and height of MN-60 were 15 ± 5 nm, 150 ± 75 nm, and5 ± 2 nm, respectively. The main functional groups and crystal forms of MN-60 were similar to MCC,but the crystallization index of MN-60 was higher than MCC. In conclusion, microfluidic technology couldrealize the preparation of high-yield and uniform NCC.
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Characterization and fine mapping of osh15(t), a novel dwarf mutant gene in rice (Oryza sativa L.)
Jiayu Wang,Shuxiu Fan,Xiaoyun Yao,Jin Liu,Xiaoyan Dong,Ting Mao 한국유전학회 2016 Genes & Genomics Vol.38 No.9
Plant height is one of the most important agronomic traits of plant architecture, and also affects grain yield in rice. In this study, we obtained a novel dwarf rice mutant of japonica variety Shennong9816, designated Shennong9816d. Compared with wild-type, the Shennong9816d plant height was significantly reduced, and the tiller number significantly increased. Additionally, the mutant yield component, and the number of large and small vascular bundles were significantly decreased compared with wildtype. Genetic analysis indicated that the Shennong9816d dwarf phenotype was controlled by a recessive nuclear gene, while the plant was shown to be sensitive to gibberellic acid. Using a large F2 population derived from a cross between Shennong9816d and the indica rice variety Habataki, the osh15(t) gene was fine mapped between RM20891 and RM20898, within a physical distance of 73.78 kb. Sequencing analysis showed that Shennong9816d carries a 1 bp mutation and a 30 bp insertion in the OSH15 region. These results suggest that osh15(t) is a novel allelic mutant originally derived from japonica variety Shennong9816, which may be useful for introducing the semi-dwarf phenotype to improve plant architecture in rice breeding practice.
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Xinjian Cai,Zhenxing Wu,Quanfeng Li,Shuxiu Wang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.
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Cai, Xinjian,Wu, Zhenxing,Li, Quanfeng,Wang, Shuxiu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.
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