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RISS 인기검색어
- 검색키워드
- 저자 : Wenbo Fan (검색결과 5 건)
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Fan Chen,Guojian Mei,Bo Zhao,Wenbo Bie,Guangxi Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
Three-dimensional (3D) ultrasonic vibration-assisted ELID grinding, which combines 3D ultrasonic vibration-assistance with electrolytic in-process grinding wheel dressing (ELID), is a compound process that is designed to achieve high-efficiency precision machining. A grinding force model of 3D ultrasonic vibration-assisted ELID grinding was first developed on the basis of the kinematics of a single grit particle and was verified through experimentation. The surface quality then was observed using white light interference profiling. It was demonstrated during the present investigation that the grinding force during 3D ultrasonic vibration-assisted ELID grinding was approximately 20 %~30 % lower than that of twodimensional (2D) ultrasonic vibration-assisted ELID grinding. In addition, the surface roughness (Ra) achieved during 3D ultrasonic vibration-assisted ELID grinding was approximately 40 %~50 % smoother than was achieved under 2D ultrasonic vibration-assisted ELID, and thus 3D ultrasonic vibration-assisted ELID grinding can achieve better surface quality.
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Preparation method and device for functionally gradient materials based on PDMS
Guangyao Zhang,Fan Gao,Jinmei Sun,Wenbo Yu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
Given the shortcomings of existing methods of preparing functionally gradient materials based on PDMS, such as insufficient raw material mixing, a single preparation method, and high preparation cost, a device that incorporates the production and preparation of functionally gradient products is proposed. Simulations using the COMSOL software were employed to determine an optimization model for the mixing conditions during the preparation of functionally gradient material mixtures. Furthermore, the mixing capabilities of the device were compared when using constant-size and variable-size stirrers. The simulation research results indicate that the preparation device, in combination with the variable-size stirrer, can effectively stir the mixing. The mixing efficiency of the device when using the variable-size stirrer increased by approximately 36 % from that when using the constant-size stirrer. Actual samples were prepared and observed using a Hitachi electron microscope at a 200x magnification. The observation results show that the SiC particles in the sample prepared with a variable-size stirrer were distributed more uniformly than those in the sample prepared with a constant-size stirrer. The product prepared using the proposed device met the conditions for manufacturing functionally gradient products.
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Jin Yuhan,Ouyang Yina,Fan Xinyang,Huang Jing,Guo Wenbo,Miao Yongwang 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.11
Objective: Water buffalo, an important domestic animal in tropical and subtropical regions, play an important role in agricultural economy. It is an important source for milk, meat, horns, skin, and draft power, especially its rich milk that is the great source of cream, butter, yogurt, and many cheeses. In recent years, long noncoding RNAs (lncRNAs) have been reported to play pivotal roles in many biological processes. Previous studies for the mammary gland development of water buffalo mainly focus on protein coding genes. However, lncRNAs of water buffalo remain poorly understood, and the regulation relationship between mammary gland development/milk production traits and lncRNA expression is also unclear. Methods: Here, we sequenced 22 samples of the milk somatic cells from three lactation stages and integrated the current annotation and identified 7,962 lncRNA genes. Results: By comparing the lncRNA genes of the water buffalo in the early, peak, and late different lactation stages, we found that lncRNA gene lnc-bbug14207 displayed significantly different expression between early and late lactation stages. And lnc-bbug14207 may regulate neighboring milk fat globule-EGF factor 8 (MFG-E8) and hyaluronan and proteoglycan link protein 3 (HAPLN3) protein coding genes, which are vital for mammary gland development. Conclusion: This study provides the first genome-wide identification of water buffalo lncRNAs and unveils the potential lncRNAs that impact mammary gland development. Objective: Water buffalo, an important domestic animal in tropical and subtropical regions, play an important role in agricultural economy. It is an important source for milk, meat, horns, skin, and draft power, especially its rich milk that is the great source of cream, butter, yogurt, and many cheeses. In recent years, long noncoding RNAs (lncRNAs) have been reported to play pivotal roles in many biological processes. Previous studies for the mammary gland development of water buffalo mainly focus on protein coding genes. However, lncRNAs of water buffalo remain poorly understood, and the regulation relationship between mammary gland development/milk production traits and lncRNA expression is also unclear.Methods: Here, we sequenced 22 samples of the milk somatic cells from three lactation stages and integrated the current annotation and identified 7,962 lncRNA genes.Results: By comparing the lncRNA genes of the water buffalo in the early, peak, and late different lactation stages, we found that lncRNA gene <i>lnc-bbug14207</i> displayed significantly different expression between early and late lactation stages. And <i>lnc-bbug14207</i> may regulate neighboring milk fat globule-EGF factor 8 (<i>MFG-E8</i>) and hyaluronan and proteoglycan link protein 3 (<i>HAPLN3</i>) protein coding genes, which are vital for mammary gland development.Conclusion: This study provides the first genome-wide identification of water buffalo lncRNAs and unveils the potential lncRNAs that impact mammary gland development.
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Effect of CBN surface coating on properties of abrasive and vitrified CBN composites
Xuezhi Wang,Minghai Wang,Jingqiang Zhang,Wenbo Fan,Tianbiao Yu 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
The advantages of CBN abrasive and vitrified bonds allow the wide use of vitrified CBN grinding tools. However, theirproperties can be affected by various factors such as vitrification itself and binding between vitrified bond and abrasive grains. In view of this, the current work aims to improve the binding characteristics of vitrified bond and abrasive grains byelucidating the effect of CBN surface coating. In particular, the thermal properties of typical nickel and titanium coatedabrasive grains were compared with those of ordinary abrasive grains. Furthermore, the strength, microstructure and phasecomposition of vitrified CBN composites were studied as well. According to the results, the thermal stability of abrasive grainsdecreased after coating processing. However, applying the vitrified CBN composite material and sintering, if appropriable, wasshown to ensure protection of the abrasive grains. Moreover, as an intermediate transition layer, the bonding properties ofvitrified bond and abrasive grains can be improved to some extent. Finally, the vitrified Ti-coated CBN composite was foundto possess the best performance.
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