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심층학습 기반 관심지점 예측 모델
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Quality of care and service trajectories for people with intellectual disabilities: defining the aspects of quality from the client's perspective
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On the Modeling of Polyelectrolyte Gels
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모바일 미디어 환경에서 공중플랫폼의 수용자 지속사용의도에 관한 연구
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종밀의 『원각경』해석에 보이는 제 사상의 수용
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FBMC-QAM 시스템에 적합한 이중 모드 인덱스 변조 기술
- 검색키워드
- 저자 : Xuandong Wang (검색결과 3 건)
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Xiuju Du,Xuandong Wang,Yun Chen,Shuyu Tian,Shifeng Lu 한국고분자학회 2018 Macromolecular Research Vol.25 No.6
In our previous work, an acidic homogenous polysaccharide TAPA1 purified from Tremella aurantialba and its acetylated derivative TAPA1-ac, deacetylated derivative TAPA1-deac and sulfated fractions TAPA1-s were obtained by chemical modification and their partially chemical characterization were investigated. In present work, the antioxidant activities of various polysaccharides, including TAPA1, and its three derivative fractions, were determined in terms of scavenging of superoxide anion radicals and hydrogen peroxide (H2O2) by using chemiluminescence measurements, and their activities of oxidative injury rehabilitation were assessed by using PC12 oxidative injury model induced with H2O2. In general, compared with TAPA1, TAPA1-ac showed significant antioxidant activities and higher oxidative injury protection effects, whereas TAPA1-deac and TAPA1-s showed lower effects. These findings seemed to suggest that antioxidant effects and rehabilitation effect of oxidative injury, relate to not only different substituted group, but also the content and the degree of substitution (DS) of acetyl group, indicating that acetylation of TAPA1 was an effective means of enhancing its antioxidant activity and rehabilitation effect.
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Xiuju Du,Xuandong Wang,Yun Chen,Shuyu Tian,Shifeng Lu 한국고분자학회 2018 Macromolecular Research Vol.26 No.6
In our previous work, an acidic homogenous polysaccharide TAPA1 purified from Tremella aurantialba and its acetylated derivative TAPA1-ac, deacetylated derivative TAPA1-deac and sulfated fractions TAPA1-s were obtained by chemical modification and their partially chemical characterization were investigated. In present work, the antioxidant activities of various polysaccharides, including TAPA1, and its three derivative fractions, were determined in terms of scavenging of superoxide anion radicals and hydrogen peroxide (H2O2) by using chemiluminescence measurements, and their activities of oxidative injury rehabilitation were assessed by using PC12 oxidative injury model induced with H2O2. In general, compared with TAPA1, TAPA1-ac showed significant antioxidant activities and higher oxidative injury protection effects, whereas TAPA1-deac and TAPA1-s showed lower effects. These findings seemed to suggest that antioxidant effects and rehabilitation effect of oxidative injury, relate to not only different substituted group, but also the content and the degree of substitution (DS) of acetyl group, indicating that acetylation of TAPA1 was an effective means of enhancing its antioxidant activity and rehabilitation effect.
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Influence of Magnetic Slot Wedge on Parameter and Loss Distribution of High Voltage Induction Motor
Qiu Hongbo,Wang Kun,Liu Ziyang,Xiong Bin,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
Owing to the stator open slot structure of the high-voltage motor, the magnetic field distribution in the motor will be uneven, and the performance of the motor will deteriorate. When the slots are embedded with magnetic material slot wedges, the magnetic field of the motor will be changed. In this article, taking a 10 kV/1000 kW high-voltage induction motor (HVIM) as the prototype, the two-dimensional finite element models are established, the eff ect of magnetic slot wedge (MSW) on HVIM was analyzed. First, by establishing the air-gap permeance function, the infl uence of magnetic slot wedge on the air gap magnetic field is analyzed, the influence mechanism of magnetic slot wedge on tooth harmonic magnetic field is revealed. In addition, the effect of magnetic slot wedge on excitation inductance, slot leakage resistance, and winding inductance of HVIM is analyzed in detail, the variation of parameters with different relative permeability of slot wedge is summarized, the changes in the motor starting performance had further discussed. Finally, the influence of the slot wedge permeability on motor losses is studied, the distribution of core loss is obtained by establishing the motor segmenting model, and the various mechanisms of core losses in different regions are revealed. The findings provide the guidelines and theoretical basis for the rational selection of magnetic slot wedges.
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