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RISS 인기검색어
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- 저자 : Yali Ma (검색결과 5 건)
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Yali Ma,Jiayong Wei,Cancan Li,Chen Liang,Guochao Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7
Aiming at the problem that the multi-objective evaluation of performance and the weighting coefficients of indexes is difficult to find, a fuzzy comprehensive performance evaluation method of rolling linear guide (RLG) is proposed. Considering the static and dynamic indexes, a structure model containing nine weighting coefficients was constructed. The performance evaluation function was established by the compromise programming method and the average power method, while weighting coefficients were determined by the improved analytic hierarchy process (I-AHP); the mathematical model was obtained to evaluate the RLG in a certain application. The evaluation results show that the confidence of the static, dynamic and comprehensive performance of the RLG is 59.21 %, 81.97 %, and 63.34 %, respectively. The feasibility of the method was verified by numerical simulation. This method indicates the pros and cons of the performance of the RLG and also indicates the direction for its optimized design.
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Modeling dynamic behavior of MDOF systems with multiple bilinear springs
Yali Ma,Shudong Yu,Delun Wang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.9
A computational scheme is presented in this paper to simulate dynamical behavior of multiple degrees of freedom (MDOF) systems with multiple bilinear springs. In the proposed scheme, a bilinear spring is modeled using by two parallel springs - a primary spring and a secondary spring. The primary spring is an ordinary linear spring having identical stiffness in tension and compression, and is active for tension and compression. The secondary spring, whose stiffness characterizes the bilinearity, is active only during compression. It is employed in connection with the Newmark integration method and the linear complementarity problem (LCP) formulation to obtain time-domain responses of dynamical systems with bilinear springs due to initial disturbances and harmonic excitations. The scheme described in this paper is effective in dealing with the sudden transition from tension to compression and vice versa simultaneously for all bilinear springs. Numerical results for bilinear oscillators with finite bilinearity ratios and impact oscillators with an infinite bilinearity ratio show that the proposed bilinear spring model is accurate, generic and valid for bilinearity ratios ranging from zero to infinity. Orderly and chaotic behavior of viscously damped 3-DOF system under harmonic excitation is studied for a wide range of excitation frequencies and bilinear ratios to demonstrate the effectiveness and applicability of the proposed model for MDOF bilinear systems.
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( Yunlong Sun ),( Yali Niu ),( Bin He ),( Long Ma ),( Ganghua Li ),( Van-tuan Tran ),( Bin Zeng ),( Zhihong Hu ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.2
Currently, the genetic modification of Aspergillus oryzae is mainly dependent on protoplast-mediated transformation (PMT). In this study, we established a dual selection marker system in an industrial A. oryzae 3.042 strain by using Agrobacterium tumefaciens-mediated transformation (ATMT). We first constructed a uridine/uracil auxotrophic A. oryzae 3.042 strain and a pyrithiamine (PT)-resistance binary vector. Then, we established the ATMT system by using uridine/uracil auxotrophy and PT-resistance genes as selection markers. Finally, a dual selection marker ATMT system was developed. This study demonstrates a useful dual selection marker transformation system for genetic manipulations of A. oryzae 3.042.
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Xiaojing Zhang,Nan Zhang,Yue Zhou,Robert Delatolla,Yali Song,Yongpeng Ma,Hongzhong Zhang 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.6
In this study, the effect of CuO nanoparticles (NPs) on partial nitrification (PN) process was investigated at various pH values. The short- and long-term experiments were carried out in six identical reactors, with or without CuO NPs, at pH values of 6.5, 8.0 and 10.0. The ammonia oxidation, reaction rates, copper content, and the microbial community were investigated. The results of this work suggested that CuO NPs inhibited the ammonia oxidation by aerobic ammonia-oxidizing bacteria (AOB), under both the acid and alkali conditions. AOB could resist the acid condition but was significantly suppressed when CuO NPs was fed, and the low pH did not aggravate the inhibition level. Almost all the bacteria lost bioactivity under the pH as 10.0, while anaerobic ammonia-oxidizing bacteria survived. The acid condition increased the Nitrosomonas relative abundance while the alkali condition lowered it. More than 60% of the supplied CuO NPs was discharged via effluent.
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Ya Li,Zhenyu Zhang,Peng Wang,Shu’an Wang,Lingling Ma,Linfang Li,Rutong Yang,Yuzhu Ma,Qing Wang 한국유전학회 2015 Genes & Genomics Vol.37 No.10
Lagerstroemia indica is a popular woody ornamental plant throughout the world. However, relatively little is known about the molecular processes regulating leaf color in L. indica compared with other ornamental plants. Although yellow leaf mutants from various organisms have been well characterized, L. indica yellow leaf mutant has not yet been reported. In this study, a L. indica yellow leaf mutant, named YL03, was characterized and its leaf transcriptome was sequenced. A total of 30,712,752 reads were generated and assembled de novo into 45,308 unigenes with an average length of 987.51 bp. Among these unigenes, 21,339 (47.10 %) were identified as putative homologs of annotated sequences in public databases. A total of 79 unigenes involved in chlorophyll biosynthesis and degradation, photosynthesis and chloroplast development were identified. The expression levels of those genes were detected using quantitative real-time PCR in this study. Among those genes, 11 unigenes showed highly significant difference in the mutant compared to wild type plants. Conclusively, the leaf color formation is greatly affected by the activity of chloroplast development and chlorophyll metabolism. And the possible formation pathway of yellow leaf mutant is deduced based on our results.
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