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- 저자 : Panpan Zhu (검색결과 4 건)
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Consensus Based Control Algorithm for Nonlinear Vehicle Platoons in the Presence of Time Delay
Panpan Yang,Ye Tang,Maode Yan,Xu Zhu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
The platoon control problem for nonlinear vehicles in the presence of time delay is investigated in thispaper, where both constant time delay and time-varying delay cases are considered. A linearized third-order vehicledynamic model is firstly derived by deploying the exact feedback linearization technique and the vehicle platooncontrol problem is converted into a consensus-seeking problem. Then, a consensus based vehicle platoon controlalgorithm with time delay is proposed, which drives vehicles to form an equally spaced platoon with the samevelocity. By deploying the Lyapunov-Razumikhin theorem, the upper bound of time delay for vehicle platoon withconstant time delay is derived and the sufficient conditions that guarantee the stability of the vehicle platoon areobtained. Meanwhile, the sufficient conditions that ensure the stability of vehicle platoon with time-varying delayare acquired via the Lyapunov-Krasovskii theorem. Numerical demonstrations verify the feasibility and correctnessof the theoretical results.
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Polymerization of Vinyl Acetate Initiated by Hydrosilane in the Presence of Platinum Complex
Ming Yuan,Wenxian Zhu,Jiaxing Lv,Panpan Zhang,Huadong Tang 한국고분자학회 2021 폴리머 Vol.45 No.3
In this work, a series of hydrosilanes including phenylsilane, diphenylsilane, triethylsilane (TES), and tris(trimethylsilyl)silane combined with catalytical amount of platinum complex such as dichloro(1,5-cyclooctadiene) platinum (COD) and dichloro(dicyclopentadienyl)platinum have been used to initiate the polymerization of vinyl acetate (VAc) at 70-95 ℃. An ultrahigh molecular weight PVAc with number-average molecular weight (Mn) up to 1.17×10<SUP>6</SUP> Da and polydispersity index (PDI) of 2.59 has been synthesized using TES as an initiator in the presence of 9.7 ppm of COD. A kinetic study indicates that the polymerization at VAc/TES/COD molar ratio = 3.0×10<SUP>5</SUP> : 60 : 1 smoothly reached 81.0% conversion in 28.0 h at 85 ℃, producing PVAc with Mn increasing linearly from 1.41×105 to 6.01×10<SUP>5</SUP> Da with the increase of monomer conversion. A mechanistic investigation revealed that COD was firstly reduced by reductive TES, producing Pt nanoparticles and corresponding silane radicals to initiate the polymerization of VAc.
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Xiaoliu Dong,Tiejun Liu,Shijun Xu,Lixia Zhu,Panpan Zhang,Aibin Cheng,Qingqiang Qian 한국유전학회 2016 Genes & Genomics Vol.38 No.3
To investigate the relevance of ABCA1 R219K polymorphisms and serum ABCA1 protein concentration to Parkinson’s disease (PD) pathogenesis and classification in Chinese population. Between June 2013 to January 2014, 108 patients diagnosed with PD at Department of Neurology, Tangshan People’s Hospital, Tangshan were enrolled in the PD group, and 123 healthy individuals, from Health Screening Center of the same hospital, with matched age, gender, and education were enrolled in the control group. Polymerase chain reaction–restriction fragment length polymorphism method was used to detect ABCA1 R219K polymorphisms and enzyme-linked immunosorbent assay used to measure serum ABCA1 concentrations. Frequencies of R/K and K/K genotypes, and K allele of ABCA1 R219K polymorphisms were significantly lower in the PD group than the control group (all P\0.05). Significant differences existed in distributions of genotype frequencies, including R/R, R/K and K/K, between PD and control group of each classification (all P\0.05). ABCA1 concentrations were significantly different in the PD and control group (P\0.05); also ABCA1 concentrations were very different among PD patients with different genotypes (all P\0.05). Serum concentrations of ABCA1were significantly different among PD patients in different classifications (all P\0.05), suggesting the negative correlation between ABCA1 serum concentration and PD classification (r = -0.776, P\0.05). And serum concentrations of ABCA1 showed obvious differences among cases with three different genotypes in each classification (all P\0.05). ABCA1 R219K polymorphisms and serum concentration were associated with pathogenesis and classification of PD, and K allele may be a protective genetic factor.
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Rong Wan,Jingran Liu,Zhengmei Yang,Panpan Zhu,Qinghe Cao,Tao Xu 한국유전학회 2020 Genes & Genomics Vol.42 No.3
Background DEAD-box protein family is the largest subfamily of RNA helicases and plays an important role in RNA metabolism and plant growth, development, and stress responses. Although DEAD-box genes have been characterized in various major crop plants, their identification and characterization in Convolvulaceae is still in infancy. Sweet potato (Ipomoea batatas, in Convolvulaceae) is the seventh most important crop in the world. Ipomoea trifida is one of the ancestors of sweet potato and is an effective resource for sweet potato cross-breeding. Objective Identification and characterisation of DEAD-box transcription factors in sweet potato wild ancestor I. trifida genome. Method A systematic genome-wide analysis was conducted to identify the DEAD-box transcription factors in the I. trifida genome. Results We identified 17 ItfDEAD-box genes which distributed unevenly on the nine chromosomes of I. trifida and encoded 29 DEAD transcripts. The phylogenetic analysis classified the DEAD-box proteins into nine groups named I–IX. Homology model prediction of ItfDEAD-box proteins obtained 14 models which lay a preliminary foundation for the further functional exploration of the ItfDEAD-box proteins. The tissue-specific and abiotic stress-responsive expression profiles of ItfDEAD-box genes were analyzed in different tissues and under abiotic stress responses by RNA-seq data and confirmed by quantitative PCR analysis. Some genes were significantly up- or down-regulated by different abiotic stress, suggesting that ItfDEAD-box plays a crucial role in stress responses in I. trifida. Conclusion The identification and gene expression of the ItfDEAD-box gene family might shed light on the function exploration of DEAD-box gene in I. trifida and promote the molecular breeding of sweet potato.
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