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Guo‐Hao Zu,Cheng-De LI 한국곤충학회 2015 Entomological Research Vol.45 No.5
Rhopus antennalis sp. nov. and R. qingdaoensis sp. nov. are described as new to science and R. nigroclavatus (Ashmead, 1902) is first recorded from China. A key to all the known Chinese species of the genus also presented.
Guo‐Hao Zu,Cheng-De LI 한국곤충학회 2017 Entomological Research Vol.47 No.5
Cerapteroceroides acutiscapus sp. nov. is described as new and Cerapteroceroides manaliensis Hayat and Khan, 2015 is first recorded from China.
DE-GUO WANG,SI-WEI ZHANG,REN-YANG HE,MING-YUAN LI 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
The mechanisms of formation of transfer film under the condition of wear of Steel AISI1020 by natural rubber were investigated. The transfer film was observed and the formation mechanisms were clarified. The formation process of transfer film on the worn surface of the steel could be divided into two stages. Firstly, the adhesive layer emerged on the worn surface of the steel by adhesion of natural rubber, in which the macromolecular chains of natural rubber joined to the surface of the steel by Van der Waals' force. And then, the iron atom and metal oxide reacted with the macroradicals of natural rubber in the adhesive layer and produced Fe-polymer compound. As a result, the transfer film was formed on the worn surface of the steel. The transfer film was joined to the worn surface of the steel by the chemical bonds and electrostatic force.
De-guo Yang,Yong-feng He,Xing-bing Wu,Yong-jiu Zhu 한국유전학회 2016 Genes & Genomics Vol.38 No.9
In order to elucidate the role of Cyp19a in sex differentiation of Schizothorax kozlovi, the full length cDNA of Cyp19a was cloned from the mature ovary of S. kozlovi by using rapid amplification of cDNA ends method, and then its relative mRNA expression levels among tissues and temperature groups were determined by using quantitative real-time PCR. The complete Cyp19a cDNA of 1795 bp of S. kozlovi was obtained, which encoded 517 amino acids and belonged to gonadal aromatase. Its deduced amino acid sequence had the above 70 % identity compared with gonadal aromatase genes of teleost fishes, but only 62–67 % when compared with brain aromatase genes of fishes. It was expressed only in heart and gonad, but no expression in other tissues, presenting relatively high tissue specificity. It also exhibited sex-specific expression pattern in gonads, but no sex differences in heart. Comparing with the Cyp19a expression levels at 12 days post hatching (dph), significant temperature effects were revealed in low temperature group (10 C) at 18 dph, and in high temperature group (26 C) at 40 dph. It suggested that gonadal aromatase Cyp19a gene may play important roles on the feminization or masculinization of S. kozlovi affected by temperature during the early developmental stage.
A novel method for identifying rotor-stator rubbing positions using the cepstrum analysis technique
Guo Chen,Yong-Quan Liu,Guang-Yi Jiang,Cheng-Gang Li,Guo-Quan Feng,De-You Wang 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
A novel method of aero-engine rubbing positions identification based on cepstrum analysis is proposed, and the transfer path characteristicswhich reflect the transfer characteristics information from rubbing points to casing measuring points are separated from the vibrationacceleration signals of casing by means of cepstrum analysis. Therefore, there is different transfer characteristics information atdifferent rubbing positions, and in view of this, twenty rubbing positions identification features from the cepstrum are extracted. A largenumber of rubbing experiments of different positions are simulated with the rotor experiment rig of aero-engine, and the characteristicanalysis of experimental samples at different rubbing positions is carried out, and the results indicate the consistency of features to thesame rubbing position and the difference of the features to the different rubbing positions. Finally, the aero-engine rubbing positionsidentification is carried out using the nearest neighbor classification method, the recognition rate reaches 100%, and the effectiveness ofthe method is full verified.
Modelling and Experimental Study of Halbach Array Magnetic Coupler
De-yong Li,Shuang Wang,Yongcun Guo,Xin Ma 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.1
In order to effectively solve the current problems of magnetic couplers such as large area and complex internal coil, the Halbach array magnetic coupler was proposed. According to the specific characteristics of the hybrid magnetic coupler structure, the mathematical model of air gap magnetic flux density is established by using the combination of electric circuit and electromagnetic field solution. Based on the current superposition, the current is converted to the surface of the copper conductor, and the electromagnetic torque model of the space magnetic field is established by integrating the induced electromotive force along the circumferential direction. In order to verify the correctness of theoretical analysis, the 1:4 prototype was designed and manufactured. Then simulation verification and experiment measurement on its mechanical behaviour are performed. The results show that the maximum error of theoretical value, simulation value and test value is 9.3%. Under the same volume size, the output torque of Halbach array magnetic coupler is increased by 16.1% compared with the ordinary disk magnetic coupler. The research could provide the reference for the design and experimental research of magnetic coupler.