Experimental and Simulation Investigation on the Effect of Slot Angle on the Flush Sharp Die Performance during Melt Blowing

Xibo Hao,Guojun Jiang,Jin Tao,Guoliang Liu,Sheng Xie 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10

Die configuration is one of the most important factors that determine the polymer jet attenuation during meltblowing. To find the optimum slot angle, we investigated the effects of sharp die slot angles (60 °, 50 °, 40 °) on the polymerjet attenuation experimentally and numerically. A model which incorporated the air-polymer coupling effect was built basedon phase field method to investigate the die performance. In the experiment, sharp dies with different slot angles werefabricated and adopted for producing melt-blown nonwovens. The SEM and filter efficiency measurement, and numericalanalysis demonstrated that the 60 ° sharp die has the best performance in polymer jet attenuation.

Simulation of Breakup Process of Polymer Jet during Melt Blowing

Xibo Hao,Yongchun Zeng 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6

A Level- set method coupled with the Navier-Stokes equations was applied to simulate the breakup process ofpolymer jet during melt blowing. The initial perturbation was represented by a trigonometric function. The theory of thepolymer jet breakup process driven by surface tension was explained and the breakup process was illustrated visually bysimulation results. By varying the parameter values in the model, the effects of viscosity, diameter, surface tension, andsurrounding perturbation on the fiber breakup process were discussed. Experiments were conducted to explore the effects ofprocessing conditions on the fiber breakup process and validate the simulation results. It is suggested that lowering thesurface tension of polymer through physical and chemical modification can help to reduce the possibility of polymer jetbreakup and produce melt blown nonwovens with better quality.

中国会计教育情况与企业会计准则现状

赵,西卜(Zhao Xibo) 한국회계정보학회 2013 한국회계정보학회 학술대회발표집 Vol.2013 No.1

존경하는 서희열교수, 내빈 여러분 안녕하십니까! 서울에 가까운 아름다운 강남대학교에 와서 회계 세무분야의 한국 전문가들과 함께 토론의 기회를 가지게 된 것은 큰 영광이라고 생각합니다. 저는 중국 인민대학교 경상대학에서 왔습니다. 연구분야는 기업회계기준 및 정부회계입니다. 서희열회장님의 지시에 따라 제가 중국 대륙의 회계학 커리큘럼의 현황을 소개하고 그 다음에 중국 회계기준 및 국제회계기준의 차이를 여러분께 소개하도록 하겠습니다. 아래와 같이 4부분으로 나누어 하겠습니다. 즉, 중국 회계 교육의 현황, 회계전공의 주요 커리큘럼, 중국기업회계기준 및 국제회계기준의 차이, 중국 회계교육의 발전추세이다. 尊敬的徐熙烈会长,女士们、先生们,大家下午好!(안녕하세요, 여러분)很荣幸有机会来到美丽闻名的首都圈特性化优秀大学——江南大学,同会计税务界的韩国专家和朋友们聚集一堂,共同讨论会计与税务话题。我来自中国人民大学商学院,主要从事企业会计准则和政府会计方面的教学和科研工作。按照徐熙烈会长的安排,下面我把中国大陆会计学教学课程的基本情况和中国会计准则与国际财务报告准则差异情况,向各位做一简要汇报。汇报包括四个部分:中国会计教育基本情况、会计专业主要专业课程、中国企业会计准则与国际财务报告准则主要差异、中国会计教育未来趋势。

EFFECTS OF ULTRASONIC RADIATION INTENSITY ON THE OXIDATION OF SINGLE-WALLED CARBON NANOTUBES IN A MIXTURE OF SULFURIC AND NITRIC ACIDS

RUI HE,XIBO PEI,LANLAN PAN,LINGYANG TIAN,Feng Luo,LEI SUI,QIANBING WAN,JIAN WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.4

One of the most commonly used techniques for purification and eventual dispersion of single-wall carbon nanotubes (SWNTs) is oxidation using strong acid and ultrasonication. Literature review reveals that ultrasonication of varying radiation intensities have been used during the acid oxidation, but few have reported whether ultrasonication of different intensities would have different effects on the structure and properties of SWNTs and how the effects are. An investigation of the effects of ultrasonic radiation intensity on SWNTs during oxidation in a mixture of sulfuric and nitric acids was conducted. Ultrasonication using different intensities (50 W, 100 W, 200 W and 300 W) was used. The acid-treated SWNTs were characterized by scanning and transmission electron microscopy, Fourier transform infrared spectroscopy, zeta potential test Boehm titration test and Raman spectrum analysis. Data from these experiments showed that high intensities provided stronger oxidizing conditions than lower ones. As ultrasonic intensity increased, larger number of SWNTs were destroyed and consumed to produce carbonaceous impurities, and more defects appeared in the tube walls.

Effects of ultrasonic treatment on the gel properties of microbial transglutaminase crosslinked soy, whey and soy–whey proteins

Qiang Cui,Xibo Wang,Guorong Wang,Rui Li,Xiaodan Wang,Shuang Chen,Jingnan Liu,Lianzhou Jiang 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.5

This paper studied the influences of diverse ultrasonic power treatments on the physico-chemical properties of soy–whey mixed protein induced by microbial transglutaminase. Two groups of 15% (m/v) of protein solution-sole protein (as control group) and mixed protein were prepared and processed under different ultrasonic powers for 30 min. After ultrasonic power treatments, gel properties were significantly increased: under 300 W, the gel hardness of mixed protein reached a maximum of 998.9 g, with its water binding capacity scoring a maximum of 87%. According to the analysis of fluorescence emission spectrum, the fluorescence intensity and maximum absorption peak had changed, for different ultrasonic power treatments had exposed more groups. The Fourier Transform Infrared Spectroscopy also suggested that ultrasonic power treatments could change the secondary structure of gel samples. The scanning electron microscope demonstrated that the network structure of mixed protein gel displayed more regular and uniform after ultrasonic treatments.

Elimination of Overshoot and Oscillation in the Auxiliary Branch of a SiC Auxiliary Resonant Commutated Pole Inverter (ARCPI)

Wenzhi Zhou,Xibo Yuan,Ian Laird 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

This paper investigates the mechanism of the overshoot and oscillation in the auxiliary branch and its elimination in a silicon carbide (SiC) auxiliary resonant commutated pole inverter (ARCPI). A mathematical model of the auxiliary branch including the parasitic capacitance of SiC MOSFETs has been derived, which reveals the oscillation mechanism in the auxiliary branch. The model shows that this oscillation is an inherent characteristic of the SiC ARCPI. To eliminate the overshoot and oscillation, a SiC ARCPI with two clamping diodes inserted between the DC bus and the auxiliary branch has been presented. The proposed auxiliary branch oscillation model and the performance of the clamped ARCPI are validated on a 3-kW, 3-phase SiC ARCPI prototype. Even though the overshoot and oscillation in the auxiliary branch has an insignificant impact on the output voltage, experimental results show that without clamping, the overshoot is more than 150% and the oscillation frequency is higher than 4 MHz. This significantly increases the required voltage ratings of the devices in the auxiliary branch. Furthermore, the overshoot and oscillation frequency in the auxiliary branch increases with the DC bus voltage because the output capacitance of the SiC MOSFETs reduces with the voltage. This degrade the electromagnetic interference (EMI) performance of the SiC ARCPI. In comparison, the clamped SiC ARCPI can mitigate the overshoot and oscillation and improve the EMI performance of the auxiliary branch. Specifically, around 6 MHz the spectral amplitude can be reduced by about 17% by the clamped ARCPI.

Effects of homogenization on the molecular flexibility and emulsifying properties of soy protein isolate

Yeye Xu,Guorong Wang,Xibo Wang,Jie Yu,Jian Wang,Zeyu Zhang,Rui Li 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.5

The sensitivity of soy protein isolate (SPI) to trypsin was characterized by its flexibility. The effects of different homogenization conditions on soy protein isolate flexibility and emulsifying properties were investigated. Set the homogenization pressure was 120 MPa (megapascal) and the homogenous number of times is 0–4 times, the flexibility increases with the increase of the homogenization times (0–3 times), the change trend of flexibility is not obvious (3–4 times). When the homogenization times was 0–3 times, the emulsifying activity increases, and the emulsifying activity was the strongest at 3 times, after homogenization 3 times, the change trend of emulsifying activity is not obvious, the trend of emulsification stability and emulsification activity were similar. The surface hydrophobicity increases with the increase of homogenization times, while the turbidity decreases. The other structural indicators such as Ultraviolet scanning and endogenous tryptophan fluorescence spectroscopy suggest that the structure of SPI becomes more stretch as the flexibility increases.

Constant Output Power Control Methods for Variable-Load Wireless Power Transfer Systems

Xu Liu,Lindsay Clare,Xibo Yuan,Jun Wang,Chonglin Wang,Jianhua Liu 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This study proposes a comprehensive mathematical model that includes coil-system circuit and loss models for power converters in wireless power transfer (WPT) systems. The proposed model helps in understanding the performance of WPT systems in terms of coil-to-coil efficiency, overall efficiency, and output power capacity and facilitates system performance optimization. Three methods to achieve constant output power for variable-load systems are presented based on system performance analysis. An optimal method can be selected for a specific WPT system by comparing the efficiencies of the three methods calculated with the proposed model. A two-coil 1 kW WPT system is built to verify the proposed mathematical model and constant output power control methods. Experimental results show that when the load resistance varies between 5 and 25 Ω, the system output power can be maintained at 1 kW with a maximum error of 6.75% and an average error of 4%. Coil-to-coil and overall efficiencies can be maintained at above 90% and 85%, respectively, with the selected optimal control method.

Integrated transcriptomic analysis on small yellow follicles reveals that sosondowah ankyrin repeat domain family member A inhibits chicken follicle selection

Zhong, Conghao,Liu, Zemin,Qiao, Xibo,Kang, Li,Sun, Yi,Jiang, Yunliang Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.8

Objective: Follicle selection is an important process in chicken egg laying. Among several small yellow (SY) follicles, the one exhibiting the highest expression of follicle stimulation hormone receptor (FSHR) will be selected to become a hierarchal follicle. The role of lncRNA, miRNA and other non-coding RNA in chicken follicle selection is unclear. Methods: In this study, the whole transcriptome sequencing of SY follicles with different expression levels of FSHR in Jining Bairi hens was performed, and the expression of 30 randomly selected mRNAs, lncRNAs and miRNAs was validated by quantitative real-time polymerase chain reaction. Preliminary studies and bioinformatics analysis were performed on the selected mRNA, lncRNA, miRNA and their target genes. The effect of identified gene was examined in the granulosa cells of chicken follicles. Results: Integrated transcriptomic analysis on chicken SY follicles differing in FSHR expression revealed 467 differentially expressed mRNA genes, 134 differentially expressed lncRNA genes and 34 differentially expressed miRNA genes, and sosondowah ankyrin repeat domain family member A (SOWAHA) was the common target gene of three miRNAs and one lncRNA. SOWAHA was mainly expressed in small white (SW) and SY follicles and was affected by follicle stimulation hormone (FSH) treatment in the granulosa cells. Knockdown of SOWAHA inhibited the expression of Wnt family member 4 (Wnt4) and steroidogenic acute regulatory protein (StAR) in the granulosa cells of prehierarchal follicles, while stimulated Wnt4 in hierarchal follicles. Overexpression of SOWAHA increased the expression of Wnt4 in the granulosa cells of prehierarchal follicles, decreased that of StAR and cytochrome P450 family 11 subfamily A member 1 in the granulosa cells of hierarchal follicles and inhibited the proliferation of granulosa cells. Conclusion: Integrated analysis of chicken SY follicle transcriptomes identified SOWAHA as a network gene that is affected by FSH in granulosa cells of ovarian follicles. SOWAHA affected the expression of genes involved in chicken follicle selection and inhibited the proliferation of granulosa cells, suggesting an inhibitory role in chicken follicle selection.

Constant Output Power Control Methods for Variable-Load Wireless Power Transfer Systems

Liu, Xu,Clare, Lindsay,Yuan, Xibo,Wang, Jun,Wang, Chonglin,Li, Jianhua The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This study proposes a comprehensive mathematical model that includes coil-system circuit and loss models for power converters in wireless power transfer (WPT) systems. The proposed model helps in understanding the performance of WPT systems in terms of coil-to-coil efficiency, overall efficiency, and output power capacity and facilitates system performance optimization. Three methods to achieve constant output power for variable-load systems are presented based on system performance analysis. An optimal method can be selected for a specific WPT system by comparing the efficiencies of the three methods calculated with the proposed model. A two-coil 1 kW WPT system is built to verify the proposed mathematical model and constant output power control methods. Experimental results show that when the load resistance varies between 5 and $25{\Omega}$, the system output power can be maintained at 1 kW with a maximum error of 6.75% and an average error of 4%. Coil-to-coil and overall efficiencies can be maintained at above 90% and 85%, respectively, with the selected optimal control method.