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RISS 인기검색어
- 검색키워드
- 저자 : Yuexin Han (검색결과 6 건)
- 무료
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- 유료
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Effect of Micronutrient Supplementation on the Growth of Preschool Children in China
Han, Junhua,Yang, Yuexin,Shao, Xiaoping,He, Mei,Bian, Lihua,Wang, Zhu The Korean Nutrition Society 2002 Nutritional Sciences Vol.5 No.3
The purpose of this study was to investigate the effects of micronutrient supplementation on the growth of preschool children in China. A double-blind, placebo-controlled trial was conducted on 156 growth retarded preschool children who were randomly assigned to the following five groups : supplemental control (S-control; n=28); zinc supplementation (+Zn; 3.5mg Zn/day, n=34); zinc and calcium supplementation (+ZnCa; 3.5mg Zn + 250mg Ca/day, n=37); zinc, calcium and vitamin A supplementation (+ZnCaVA; 3.5mgZn + 250mgCa + 200gVA/day, n=28); and calcium and vitamin A supplementation (+CaVA; 250mgCa + 200gVA/day, n=29). Another 34 children of normal height were selected as a normal control (N-control). Supplementation continued for twelve months. After supplementation, the height gains in the +Zn group (7.84cm per year) and the +ZnCa group (7.70 cm per year) were significantly higher than that in the S-control group (6.74 cm per year, P<0.05). The weight gain in the +ZnCaVA group (2.55kg per year) and the +CaVA group (2.57 kg per year) was also significantly higher than that in the S-control group (2.19 kg per year, P<0.05). The average number of days of illness in each group taking supplements was lower than that in the S-control group (13 days per year compared with 23 days per year). No significant differences in bone maturity were observed between the groups. In conclusion, in this study Zinc and Zinc + Calcium supplementation improved the height gain, and vitamin A improved the weight gain, in growth retarded preschool children, but these supplements did not affect the maturity of bone. Micronutrient supplementation also lowered the morbidity of these children.
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SOI radiation‑hardened 300 V half‑bridge date driver IC design with high dv/dt noise immunity
Yuexin Gao,Xiaowu Cai,Zhengsheng Han,Yun Tang,Liqiang Ding,Ruirui Xia,Mali Gao,Fazhan Zhao 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.5
Noise immunity is a critical index of high-voltage half-bridge gate driver integrated circuits (IC). Various noise cancelation technologies have been proposed to improve dv/dt noise immunity with sacrifices in terms of area and propagation delay time. Besides, when it is applied to an inductive load, the half-bridge driver is vulnerable to negative surges at the VS terminal, which is the offset ground of the high-side channel. A 300 V half-bridge gate driver IC with noise rejection module is designed in this paper. The noise immunity can be improved to 87.5 V/ns. The VS negative swing region can be extended to − 5.1 V. In addition, the proposed driver IC can work normally at a working frequency of 500 kHz and the delay matching time between the high-side and the low-side is less than 4 ns. The propagation delay time of the high-side channel is measured at 71.6 ns. Furthermore, gamma ray irradiation experimental results show that the proposed structure presents a good radiation tolerance of 100 krad (Si). The presented half-bridge gate driver IC is fabricated with the silicon-on-insulator (SOI) bipolar-CMOS-DMOS (BCD) process, which occupied an area of 1.86 mm2.
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Qi Zhang,Yongsheng Sun,Yuexin Han,Yanjun Li,Peng Gao 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
In this work, a green self-magnetization roasting technology for producing magnetite was proposed withoutadding additional. The regulatory mechanisms of the main factors (siderite dosage, roasting temperature,and roasting time) on the self-magnetization roasting process were investigated. In-situ kinetic ofthe self-magnetization roasting process was analyzed by the infrared gas analyzer, and the phase transformationwas investigated by in-situ X-ray diffraction and Mössbauer. Under the optimal roasting conditionsof 30% siderite dosage, 730 C, and 7.5 min, the iron concentrate with Fe grade 68.82% and Ferecovery 99.48% was obtained. The kinetic and phase transformation results indicated that the selfmagnetizationroasting process was divided into two stages: siderite pyrolysis in the prophase stage,and hematite reduced to magnetite by reductant (FeO and CO) from siderite pyrolysis in the anaphasestage. The SEM analyses showed that the newborn magnetite crystals were mainly coarse-grained andneedles, which fitted the kinetics characteristics for the Nucleation model. Using self-magnetizationroasting technology, siderite and hematite would promote mutual reduction to improve product magnetismand roasting efficiency without adding reductant. Also, self-magnetization roasting will enhancethe utilization rate of siderite, and it contributes to energy conservation and CO2 emission reduction.
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Qiang Zhang,Yongsheng Sun,Yuexin Han,Peng Gao,Wenbo Li 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
The application of suspension magnetization roasting technology in ferruginous rare earth bearing orehas gained significant attention. Bastnaesite, due to its pyrolysis characteristics, has been proposed asa reductant for iron minerals. In this study, the pyrolysis of bastnaesite was investigated through variousin-situ methods. The results showed that during pyrolysis, CeOF and CO2 were first generated, followedby the reaction of CO2 with Ce2O3 and Ce7O12 to produce CO. Pyrolysis occurred initially on the particlesurface and then progressed inward. Increasing the roasting temperature promoted the pyrolysis of bastnaesiteand CO generation. The addition of CO2 during the roasting process enhanced the formation of CO. The pyrolysis kinetic mechanisms under isothermal and non-isothermal conditions were phaseboundarycontrolled reaction mechanism (n = 4) and phase-boundary controlled reaction mechanism(n = 2–4), respectively. This detailed analysis of the pyrolysis behavior of bastnaesite facilitates the efficientand low-carbon development of ferruginous rare earth ores through suspension magnetizationroasting.
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Growth behavior and kinetics of magnetite during magnetization roasting
Qiang Zhang,Yongsheng Sun,Shuai Wang,Yuexin Han,Yanjun Li,Peng Gao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The magnetization roasting of hematite with two particle sizes was performed to investigate the growthbehavior and kinetics of magnetite. The magnetite exhibited comparable growth trends throughout themagnetization roasting process at different roasting temperatures, and enhancing the roasting temperaturecan facilitate the growth of magnetite. The nascent magnetite nuclei appeared acicular, predominantlydeveloped along the edges and fissures of the hematite particles before progressively growinginward. Moreover, the temperature stress and magnetite formation led to the loose and porous structureof the nascent magnetite particles. The growth kinetics demonstrated that the growth process of magnetitecould be divided into induction period and growth period based on the different growth rates. For the same hematite sample, the growth rate of magnetite in the induction period was lower than thatin the growth period. The magnetization roasting of hematite with a smaller particle size may be completedin a shorter time, even if increasing the particle size of hematite can accelerate the growth rateof magnetite. The growth kinetic models were established based on the parabolic law, and the reliabilityof describing the growth process of magnetite was verified by comparing the predicted values with theexperimental values.
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