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RISS 인기검색어
- 검색키워드
- 저자 : Sihua Xu (검색결과 3 건)
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Athermalization of an Optical System Based on Lens Shape and Assembly Method
Sihua Xu,Xiaoqiang Peng,Guipeng Tie,Chaoliang Guan,Hao Hu,Yupeng Xiong 한국광학회 2019 Current Optics and Photonics Vol.3 No.5
Temperature adaptability is an important metric for evaluating the performance of an optical system. The temperature characteristics of the optical system are closely related to the material and shape of its lens. In this paper, we establish a mathematical model relating the temperature characteristics to the shape and material of the lens. Then a novel assembly structure that can solve the lens constraint and positioning problem is proposed. From those basics, the correctness of the theoretical model and the effectiveness of the assembly structure are verified through simulated analysis of the imaging quality of the optical system, whose operating temperature range is -60~100°C.
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Jin, Sihua,Xu, Yuan,Zang, He,Yang, Lei,Lin, Zhiqiang,Li, Yongsheng,Geng, Zhaoyu Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.3
Objective: This study examined the effects of divergence in residual feed intake (RFI) on expression profiles of key genes related to lipid transport in the liver and duodenal epithelium and their associations with feed efficiency traits in meat-type ducks. Methods: A total of 1,000 male ducks with similar body weight (1,042.1±87.2 g) were used in this study, and their individual RFI was calculated from 21 to 42 d of age. Finally, the 10 highest RFI (HRFI) and 10 lowest RFI (LRFI) ducks were chosen for examining the expression of key genes related to lipid transport in the liver and duodenal epithelium using quantitative polymerase chain reaction. Results: In the liver, expression levels of albumin (ALB), CD36 molecule (CD36), fatty acid hydroxylase domain containing 2 (FAXDC2), and choline kinase alpha (CHKA) were significantly higher in LRFI ducks than in HRFI ducks (p<0.01); negative correlations (p<0.05) between expression levels of ALB, CD36, FAXDC2, and CHKA and RFI were detected in the liver. Additionally, ALB expression was strongly positively correlated (p<0.05) with CD36, FAXDC2, CHKA, and apolipoprotein H (APOH) expression in the liver. In duodenal epithelium, we found that mRNA levels of ALB, CD36, FAXDC2, and APOH were significantly higher in LRFI ducks than in HRFI ducks (p<0.01); RFI was strongly negatively correlated (p<0.05) with ALB, FAXDC2, and APOH expression, while ALB expression was strongly positively correlated with APOH expression (p<0.01) in duodenal epithelium. Furthermore, expression levels of both ALB and FAXDC2 genes were significantly associated with feed conversion ratio and RFI in both liver and duodenal epithelium (p<0.05). Conclusion: Our findings therefore suggest that ALB and FAXDC2 genes might be used as potential gene markers designed to improve feed efficiency in future meat-type duck breeding programs.
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Jishen Jiang,Jiandao Yang,Lei Xiao,Sihua Xu,Wei Zhe Wang,Ying Zheng Liu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
An in-service steam strainer was found to have failed in a steam turbine valve due to the impact of a foreign body. Thus, a Finite element (FE) model was built to study the impact effect of a foreign body on a steam strainer. A Johnson–Cook strength model and its failure model were used to describe the impact-induced failure of the film and deformation of the support in the strainer. The effects of the impact location, shape, mass and speed of the foreign body on the failure of the strainer were investigated. The possible locations of micro-cracks in the film were determined. The FE results indicated that impact by an exfoliated metal part (with small mass, sharp edges and high speed hitting the film close to the rib) is likely to cause failure of the film and large deformation of the support.
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