Rui Yang

Publications (8)3.63 Total impact

• Source

  Available from: nju.edu.cn

  Conference Proceeding: Improve the Effectiveness of Test Case Generation on EFSM via Automatic Path Feasibility Analysis.

  Rui Yang, Zhenyu Chen, Baowen Xu, W. Eric Wong, Jie Zhang
  13th IEEE International Symposium on High-Assurance Systems Engineering, HASE 2011, Boca Raton, FL, USA, November 10-12, 2011; 01/2011
• Source

  Available from: Zhen-Yu Tian

  Article: An experimental study of the premixed benzene/oxygen/argon flame with tunable synchrotron photoionization

  Bin Yang, Yuyang Li, Lixia Wei, Chaoqun Huang, Jing Wang, Zhenyu Tian, Rui Yang, Liusi Sheng, Yunwu Zhang, Fei Qi
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  ABSTRACT: A comprehensive experimental study of the premixed benzene/oxygen/argon flame at 4.0 kPa with a fuel equivalence ratio (ϕ) of 1.78 has been performed with the tunable synchrotron photoionization and molecular-beam sampling mass spectrometry. Isomers of most observed species in the flame have been unambiguously identified by measurements of the photoionization efficiency spectra. Mole fraction profiles of species up to C16H10 have been measured at the selective photon energies near ionization thresholds, and the flame temperature profile is obtained using Pt/Pt–13%Rh thermocouple. Compared with previous studies on benzene flames by Bittner and Howard, and by Defoeux et al., a number of new species are observed in the present work. These new combustion intermediates should be included in the kinetic models of the growth of polycyclic aromatic hydrocarbons (PAHs) and benzene oxidation. Free radicals detected in the flame include CH3, C2H, C2H3, C2H5, C3H, C3H3, C3H5, C4H, C4H3, C4H5, C4H7, C5H3, C5H5, C5H7, C6H5, C6H5O, C7H7, and C9H7. More significantly, isomers of some PAHs have been identified, which should be of importance in understanding the mechanism of soot formation.
  Proceedings of the Combustion Institute 03/2007; 31(1):555-563. · 3.63 Impact Factor
• Source

  Available from: arxiv.org

  Article: Epidemic spreading on heterogeneous networks with identical infectivity

  Rui Yang, Bing-Hong Wang, Jie Ren, Wen-Jie Bai, Zhi-Wen Shi, Wen-Xu Wang, Tao Zhou
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  ABSTRACT: In this Letter, we propose a modified susceptible-infected-recovered (SIR) model, in which each node is assigned with an identical capability of active contacts, A, at each time step. In contrast to the previous studies, we find that on scale-free networks, the density of the recovered individuals in the present model shows a threshold behavior. We obtain the analytical results using the mean-field theory and find that the threshold value equals 1/A, indicating that the threshold value is independent of the topology of the underlying network. The simulations agree well with the analytic results. Furthermore, we study the time behavior of the epidemic propagation and find a hierarchical dynamics with three plateaus. Once the highly connected hubs are reached, the infection pervades almost the whole network in a progressive cascade across smaller degree classes. Then, after the previously infected hubs are recovered, the disease can only propagate to the class of smallest degree till the infected individuals are all recovered. The present results could be of practical importance in the setup of dynamic control strategies.
  Physics Letters A. 10/2006;
• Article: Three-phase (β + β′ + γ′) NiAlTi(Cr,Fe) alloys for high temperature use

  Rui Yang, John A Leake, Robert W Cahn
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  ABSTRACT: The three-phase field incorporating the β (NiAl), β′ (Ni2AlTi) and γ′ (Ni3Al) phases in the NiAlTi system was accurately determined. A number of alloys within that field, with or without boron, chromium or iron additions, were compression-tested for plastic deformability and for strength at room temperature and up to 800°C. It was found that the presence of a substantial fraction of the relatively ductile γ′ phase in semicoherent epitaxy with β and β′ conferred several per cent of compressive plasticity on these alloys. The strength of the best alloys remained impressively high up to about 650°C. Results of a TEM investigation of the behaviour of dislocations at room temperature in the β and β′ phases of some of the three-phase alloys are outlined, and the process of “dislocation injection” from a more ductile into a less ductile phase is proposed as a general phenomenon.
  Materials Science and Engineering: A.
• Article: Novel Strategy for Synthesis of High Quality CdTe Nanocrystals in Aqueous Solution

  Yu-xi YAN, Ying MU, Guo-dong FENG, Lei ZHANG, Lin-lin ZHU, Ling XU, Rui YANG, Qin-han JIN
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  ABSTRACT: A novel aqueous route for the synthesis of high-quality CdTe nanocrystals(NCs) is presented in this article. With both glutathione(GSH) and cysteine[n(GSH):n(cysteine)=1:3] as stabilizers, high-quality CdTe NCs with controllable photoluminescence(PL) wavelength from 500 to 630 nm can be prepared within 4 h. As-prepared CdTe NCs show higher photoluminescence quantum yields(PLQY) compared with CdTe NCs prepared via other aqueous methods. When the fluorescent emission peak appeared in orange-red window, the PLQY reaches 70% or above at room temperature without any post-preparative treatment.
  Chemical Research in Chinese Universities.
• Article: Degradation products formed during UV exposure of polyethylene–ZnO nano-composites

  Rui Yang, P.A. Christensen, T.A. Egerton, J.R. White
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  ABSTRACT: Photodegradation of low density polyethylene (LDPE) containing nano-particulate ZnO has been studied using FTIR to follow the development of oxidation products in the polymer film and to monitor carbon dioxide evolved as a principal product of oxidation. The degradation behaviour of ZnO-free LDPE has been compared with that of compounds containing 0.25% and 0.75% ZnO and these results are compared with those obtained using similar films containing nano-particulate TiO2. Under UV exposure, the presence of ZnO accelerated the development of carbonyl groups and CO2 production. The carbonyl group development was more rapid when TiO2 was used whereas ZnO caused greater CO2 generation. Carbonyl group development seemed to correlate better with the reduction in mechanical properties whereas CO2 generation correlated better with weight change measurements. The influence of ZnO on the oxidation pathways in LDPE is discussed; it is proposed that photo-oxidation is relatively much more likely to occur at terminal sites (rather than at pendent sites) when ZnO is present.
  Polymer Degradation and Stability.
• Article: A model for analyzing the performance of photocatalytic air cleaner in removing volatile organic compounds

  Yinping Zhang, Rui Yang, Rongyi Zhao
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  ABSTRACT: A photocatalytic oxidation (PCO) reactor model was developed to analyze the removal of volatile organic compounds (VOCs) in indoor air. Two parameters, the fractional conversion, ε, and the number of mass transfer units (NTUm), were found to be the main parameters influencing the photooxidation performance of PCO reactors. The factors of affecting the effect of removing VOCs of PCO reactor are discussed. The predicted photocatalytic reaction rate coefficient, fractional conversion, ε, and NTUm for a typical PCO reactor agreed well with experimental data. The study shows that the effectiveness—NTU method used for heat exchangers is also an effective tool for designing PCO reactors and for evaluating their VOC removal effect.
  Atmospheric Environment.
• Article: A novel immobilized cholinesterase for on-site screening of organophosphate and carbamate compounds

  Ming-Qiang Zou, Rui Yang, Da-Ning Wang, Jin-Feng Li, Qin-Han Jin
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  ABSTRACT: Acetylcholinesterase was physically adsorbed on polyvinylpyrrolidone K30 to prepare a novel immobilized cholinesterase, which was described for the first time. The immobilized enzyme was tested for its reactivity, enzyme activity stability, the solubility, the influence of pH and buffer, and characteristic reactivity with inhibitors, e.g., organophosphate and carbamate compounds. The result revealed that the immobilized cholinesterase held its original activity in solution, stable enough, easy to dissolve for convenient operation, and this immobilized cholinesterase could be well used for rapid, on-site screening of organophosphate and carbamate compounds, together with a portable pesticide analyzer.
  Pesticide Biochemistry and Physiology.