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RISS 인기검색어
- 검색키워드
- 저자 : ( Huabing Zhao ) (검색결과 3 건)
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Yun Huang,Yunxiu Li,Hua Zhao,Huabing Wen 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
In order to solve the problem of packer rubber failure at variable temperature and explore the effect of temperature on constitutive model of hydrogenated nitrile butadiene rubber (HNBR) for packer,this paper concludes that the Yeoh model is the most suitable for HNBR by comparing the experimental data at room temperature with the several common classical hyperelastic models. And it also concludes with a modified Yeoh model for different temperatures by modifing the material parameters as the temperature functions. And the stress-strain relationship of HNBR at different temperature is obtained,which can be used to prove the correctness of the model. Finally, the conclusion that the contact stress between packer rubber and casing increases with the increase of temperature is obtained through the case analysis of HNBR cylinder. The HNBR constitutive model obtained in this paper can provide theoretical basis for the engineering application of HNBR materials. It also extends the field that temperature affects on the HNBR constitutive model.
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Meng Fanchao,Wu Yuying,Li Wenbo,Hu Kaiqi,Zhao Kai,Yang Huabing,Gao Tong,Sun Yue,Liu Xiangfa 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Evolution of the heat-resistant phases and deformation behavior of α-Al matrix of four alloys have been characterized by SEM and EBSD. The strengthening mechanisms influenced by morphology and distribution of the heat-resistant phases were described. And the strain contouring of the α-Al matrix after deformation was rendered. The heat-resistant phases with block-like as reticular or semi-reticular network distribution exist in grain boundary can effectively provide elevated-temperature strength for alloys, while the strain contouring of α-Al matrix is mainly concentrated in the area with fewer intermetallic phases. It is shown that intermetallic phase evolution corresponds to extrusion treatment and the formation of eutectic Si and primary Si, highly interconnected networks of intermetallic phases exist in the alloy in which the primary Si and the eutectic Si are simultaneously present or disappeared. And only the disappearance of the primary Si and the extrusion treatment will destroy the network structure of the intermetallic phases. A reticular or semi-reticular microstructure is more capable of matching strength and plasticity and facilitating uniform deformation of the α-Al matrix. And the destruction of this microstructure is allowed to accommodate more plastic strain before failure.
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( Sanyuan Shi ),( Liu Yang ),( Chen Yang ),( Shanshan Li ),( Hong Zhao ),( Lu Ren ),( Xiaokang Wang ),( Fuping Lu ),( Ying Li ),( Huabing Zhao ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.2
Many bacteria metabolize aromatic compounds via catechol as a catabolic intermediate, and possess multiple genes or clusters encoding catechol-cleavage enzymes. The presence of multiple isozyme-encoding genes is a widespread phenomenon that seems to give the carrying strains a selective advantage in the natural environment over those with only a single copy. In the naphthalene-degrading strain Pseudomonas putida ND6, catechol can be converted into intermediates of the tricarboxylic acid cycle via either the ortho- or meta-cleavage pathways. In this study, we demonstrated that the catechol ortho-cleavage pathway genes (catB<sub>I</sub>C<sub>I</sub>A<sub>I</sub> and catB<sub>II</sub>C<sub>II</sub>A<sub>II</sub>) on the chromosome play an important role. The cat<sub>I</sub> and cat<sub>II</sub> operons are co-transcribed, whereas catA<sub>I</sub> and catA<sub>II</sub> are under independent transcriptional regulation. We examined the binding of regulatory proteins to promoters. In the presence of cis-cis-muconate, a well-studied inducer of the cat gene cluster, CatR<sub>I</sub> and CatR<sub>II</sub> occupy an additional downstream site, designated as the activation binding site. Notably, CatR<sub>I</sub> binds to both the cat<sub>I</sub> and cat<sub>II</sub> promoters with high affinity, while CatR<sub>II</sub> binds weakly. This is likely caused by a T to G mutation in the G/T-N11-A motif. Specifically, we found that CatR<sub>I</sub> and CatR<sub>II</sub> regulate catB<sub>I</sub>C<sub>I</sub>A<sub>I</sub> and catB<sub>II</sub>C<sub>II</sub>A<sub>II</sub> in a cooperative manner, which provides new insights into naphthalene degradation.
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