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Measure Synchronization and Phase Coherence in a High Dimensional Hamiltonian System
Jing Tian,Bo Li,Haibo Qiu 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.8
Partial and complete measure synchronizations (MSs) are investigated in a high-dimensional Hamiltonian system. Here, a four-coupled ring-shaped rotor model is employed. We calculate the averaged energy of each rotor numerically to address the clustering process of measure synchronization. Poincar\'e sections are used to analyze the dynamic mechanism of partial MS and complete MS transitions, and the separatrix crossing is revealed to be the dynamical mechanism behind all different MS transition behaviors. By calculating the averaged frequency of each rotor, we explore the relationship between frequency locking and MS, and reveal a one-to-one correspondence. Furthermore, we find that abrupt changes in global or even partial phase coherence between the phase oscillators can be an indicator for MS transitions, albeit full phase coherence is not equivalent to measure synchronization.
Tian-Min Qiao,Jing Zhang,Shu-Jiang Li,Shan Han,Tian-Hui Zhu 한국식물병리학회 2016 Plant Pathology Journal Vol.32 No.5
Eucalyptus dieback disease, caused by Cylindrocladiumscoparium, has occurred in last few years in largeEucalyptus planting areas in China and other countries. Rapid, simple, and reliable diagnostic techniquesare desired for the early detection of Eucalyptus diebackof C. scoparium prior to formulation of efficientcontrol plan. For this purpose, three PCR-based methodsof nested PCR, multiplex PCR, loop-mediatedisothermal amplification (LAMP) were developed fordetection of C. scoparium based on factor 1-alpha (tef1)and beta-tubulin gene in this study. All of the threemethods showed highly specific to C. scoparium. Thesensitivities of the nested PCR and LAMP were muchhigher than the multiplex PCR. The sensitivity of multiplexPCR was also higher than regular PCR. C. scopariumcould be detected within 60 min from infectedEucalyptus plants by LAMP, while at least 2 h wasneeded by the rest two methods. Using different Eucalyptustissues as samples for C. scoparium detection,all of the three PCR-based methods showed muchbetter detection results than regular PCR. Base on theresults from this study, we concluded that any of thethree PCR-based methods could be used as diagnostictechnology for the development of efficient strategiesof Eucalyptus dieback disease control. Particularly,LAMP was the most practical method in field applicationbecause of its one-step and rapid reaction, simpleoperation, single-tube utilization, and simple visualizationof amplification products.
Jing Tian,Yixi Cai,Yunxi Shi,Yingxin Cui,Runlin Fan 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.2
Polyoxymethylene dimethyl ethers (PODE) was blended in diesel at volume ratios of 0 %, 10 %, 20 %, and 30 % (denoted as P0, P10, P20, and P30). The experimental study was carried on an unmodified YD480Q diesel engine. An engine exhaust particle sizer was introduced to analyze the particulate matter (PM) concentration and particle size distribution of diesel engine emission. The evaporation-oxidation characteristics of the PODE/diesel blends and the effect of the fuel blends on the oxidative activity of PM were investigated by thermogravimetric analysis and Arrhenius theorem. The results showed that blending PODE in diesel improved the evaporation-oxidation characteristics of the fuel and decreased the apparent activation energy of the fuel blends. PODE played a positive role in reducing PM emissions. The particle total number concentration of P30 decreased 28.29 ~ 66.60 % and the particle total volume density decreased 54.16 ~ 80.06 % compared to diesel. The particle size distribution shifted to a smaller particle size as the PODE blending ratio was increased. The mass fraction of the volatile substances (VS) increased and the mass fraction of the dry soot (DS) decreased by employing PODE as a diesel additive. Also, the oxidation activity of VS increased as the PODE blending ratio was increased. The oxidation activity of DS climbed to the peak when the PODE blending ratio was 20 % and then decreased.
Synthesis of Poly(1-oxo-2-phenyltrimethylene) Catalyzed by Palladium-Rare Earth Catalyst
Tian, Jing,Guo, Jin-Tang,Zhu, Cheng-Cai,Zhang, Xin,Xu, Yong-Shen The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.6
Poly(1-oxo-2-phenyltrimethylene) was successfully synthesized in the presence of palladium acetate and rare earth acetate $RE(OAc)_3$ (RE=Pr, Nd, Eu, Dy, Ho) multiplex catalyst system. The final products were characterized by elemental analysis, nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The effects of various reaction parameters including molar ratio of rare earth/$Pd^{2+}$, methanol usage, 2,2-bipyridyl, p-toluensulfonic acid, and p-benzoquinone were studied in detail, and the influence of different rare earths on the copolymerization was also discussed. It is found that the rare earths have favorable co-catalytic properties and palladium-rare earth multiplex catalyst showed higher catalytic activity than palladium catalyst in the copolymerization of carbon monoxide (CO) and styrene (ST).
( Jing Han ),( Yong Sheng Tian ),( Jing Xu ),( Li Juan Wang ),( Bo Wang ),( Ri He Peng ),( Quan Hong Yao ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.9
Glyphosate is the active component of the top-selling herbicide, the phytotoxicity of which is due to its inhibition of the shikimic acid pathway. 5-Enolpyruvylshikimate-3-phosphate synthase (EPSPS) is a key enzyme in the shikimic acid pathway. Glyphosate tolerance in plants can be achieved by the expression of a glyphosate-insensitive aroA gene (EPSPS). In this study, we used a PCR-based two-step DNA synthesis method to synthesize a new aroA gene (aroAR. leguminosarum) from Rhizobium leguminosarum. In vitro glyphosate sensitivity assays showed that aroAR. leguminosarum is glyphosate tolerant. The new gene was then expressed in E. coli and key kinetic values of the purified enzyme were determined. Furthermore, we transformed the aroA gene into Arabidopsis thaliana by the floral dip method. Transgenic Arabidopsis with the aroAR. leguminosarum gene was obtained to prove its potential use in developing glyphosate-resistant crops.
Pd(II) Catalyzed Copolymerization of Styrene and CO in Quaternary Ammonium Ionic Liquids
Tian, Jing,Guo, Jin-Tang,Zhu, Cheng-Cai,Zhang, Xin,Xu, Yong-Shen The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.3
Poly(1-oxo-2-phenyltrimethylene) was synthesized by palladium-catalyzed copolymerization of styrene and carbon monoxide in quaternary ammonium ionic liquids. The $[Pd(bipy)_2][PF_6]_2$ compound had relatively more catalytic activity than $[Pd(bipy)_2][BF_4]_2$ in ionic liquids. The catalytic activity of palladium (II) composite catalyst was superior to the catalyst formed in situ from palladium acetate, 2,2-bipyridyl, and $X^-$ ($X^-=PF_6^-$, $BF_4^-$) in ionic liquids. The effects of the volume of ionic liquids, reaction time and benzoquinone content on the copolymerization were also described.