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Sawtooth-triggered limit-cycle oscillations and I-phase in the HL-2A tokamak
Zhao, K.J.,Cheng, J.,Diamond, P.H.,Dong, J.Q.,Yan, L.W.,Hong, W.Y.,Xu, M.,Tynan, G.,Miki, K.,Huang, Z.H.,Itoh, K.,Itoh, S.-I.,Fujisawa, A.,Nagashima, Y.,Inagaki, S.,Wang, Z.X.,Wei, L.,Song, X.M.,Lei, IOP Publishing 2013 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.53 No.12
Vives i Batlle, J.,Beresford, N.A.,Beaugelin-Seiller, K.,Bezhenar, R.,Brown, J.,Cheng, J.-J.,Ć,ujić,, M.,Dragović,, S.,Duffa, C.,Fié,vet, B.,Hosseini, A.,Jung, K.T.,Kamboj, S.,Keu Elsevier 2016 JOURNAL OF ENVIRONMENTAL RADIOACTIVITY Vol.153 No.-
<P><B>Abstract</B></P> <P>We report an inter-comparison of eight models designed to predict the radiological exposure of radionuclides in marine biota. The models were required to simulate dynamically the uptake and turnover of radionuclides by marine organisms.</P> <P>Model predictions of radionuclide uptake and turnover using kinetic calculations based on biological half-life (<I>T</I> <SUB> <I>B1/2</I> </SUB>) and/or more complex metabolic modelling approaches were used to predict activity concentrations and, consequently, dose rates of <SUP>90</SUP>Sr, <SUP>131</SUP>I and <SUP>137</SUP>Cs to fish, crustaceans, macroalgae and molluscs under circumstances where the water concentrations are changing with time. For comparison, the ERICA Tool, a model commonly used in environmental assessment, and which uses equilibrium concentration ratios, was also used. As input to the models we used hydrodynamic forecasts of water and sediment activity concentrations using a simulated scenario reflecting the Fukushima accident releases.</P> <P>Although model variability is important, the intercomparison gives logical results, in that the dynamic models predict consistently a pattern of delayed rise of activity concentration in biota and slow decline instead of the instantaneous equilibrium with the activity concentration in seawater predicted by the ERICA Tool. The differences between ERICA and the dynamic models increase the shorter the <I>T</I> <SUB> <I>B1/2</I> </SUB> becomes; however, there is significant variability between models, underpinned by parameter and methodological differences between them.</P> <P>The need to validate the dynamic models used in this intercomparison has been highlighted, particularly in regards to optimisation of the model biokinetic parameters.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Comparison of 7 dynamic models for radionuclide transfer in marine biota with the ERICA Tool. </LI> <LI> <SUP>90</SUP>Sr, <SUP>131</SUP>I, <SUP>137</SUP>Cs in fish, crustaceans, algae and molluscs in a Fukushima scenario. </LI> <LI> Consistent pattern of delayed uptake and slow turnover by the dynamic models. </LI> <LI> Differences between ERICA and dynamic models increase with biological half-life. </LI> <LI> Significant variability between models linked to parameter and methodology differences. </LI> </UL> </P>
Zhao, K.J.,Nagashima, Y.,Li, F.M.,Shi, Yuejiang,Diamond, P.H.,Dong, J.Q.,Itoh, K.,Itoh, S.-I.,Zhuang, G.,Liu, H.,Chen, Z.P.,Cheng, J.,Nie, L.,Ding, Y.H.,Hu, Q.M.,Chen, Z.Y.,Rao, B.,Cheng, Z.F.,Gao, L. IOP 2017 Nuclear fusion Vol.57 No.12
<P>The temporal-spatial structures of plasma flows and turbulence around tearing mode islands are presented. The experiments were performed using Langmuir probe arrays in the edge plasmas of J-TEXT tokamak. The correlation analyses clearly show that the flows have similar structures of <I>m</I>/<I>n</I> = 3/1 as the magnetic island does (<I>m</I> and <I>n</I> are the poloidal and toroidal mode numbers, respectively). The sign of the potential fluctuations for the flows inverses and the powers significantly reduce at <I>q</I> = 3 surface. Approaching to the last closed flux surface for the magnetic islands, the radially elongated flow structure forms. The flows are concentrated near separatrix and show quadrupole structures. The turbulence is concentrated near X-point and partly trapped inside the magnetic islands.</P>
Modeling slump of concrete with fly ash and superplasticizer
I-Cheng Yeh 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.6
The effects of fly ash and superplasticizer (SP) on workability of concrete are quite difficult to predict because they are dependent on other concrete ingredients. Because of high complexity of the relations between workability and concrete compositions, conventional regression analysis could be not sufficient to build an accurate model. In this study, a workability model has been built using artificial neural networks (ANN). In this model, the workability is a function of the content of all concrete ingredients, including cement, fly ash, blast furnace slag, water, superplasticizer, coarse aggregate, and fine aggregate. The effects of water/binder ratio (w/b), fly ash-binder ratio (fa/b), superplasticizer-binder ratio (SP/b), and water content on slump were explored by the trained ANN. This study led to the following conclusions: (1) ANN can build a more accurate workability model than polynomial regression. (2) Although the water content and SP/b were kept constant, a change in w/b and fa/b had a distinct effect on the workability properties. (3) An increasing content of fly ash decreased the workability, while raised the slump upper limit that can be obtained.
On the Lobbying Behavior Response to Political Asymmetries in International Economic Integration
( I Hui Cheng ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2003 Journal of Economic Integration Vol.18 No.3
The objective of this paper is to examine the effects of political asymmetries on a FTA and a CU. I have shown that either a higher lobbying sensitivity to the foreign firm or a more susceptibility of politicians to lobbying are sufficient to lead to a higher tariff protection at the individual country level. Under a CU, firms may dislike any form of political dominance in the common trade policy unless politicians do not discriminate against foreign lobbyists significantly. In contrast, under a FTA, if politicians are very susceptible to lobbying, the results appear to be ambiguous.
Prediction of workability of concrete using design of experiments for mixtures
I-Cheng Yeh 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.1
In this study, the effects and the interactions of water content, SP-binder ratio, and waterbinder ratio on the workability performance of concrete were investigated. The experiments were designed based on flatted simplex-centroid experiment design modified from standard simplex-centroid one. The data gotten from the design was used to build the concrete slump model using neural networks. Research reported in this paper shows that a small number of slump experiments can be performed and meaningful data obtained with the experiment design. Such data would be suitable for building slump model using neural networks. The trained network can be satisfactorily used for exploring the effects of the components and their interactions on the workability of concrete. It has found that a high water content and a high SP/b ratio is essential for high workability, but achieving this by increasing these parameters will not in itself guarantee high workability. The w/b played a very important role in producing workability and had rather profound effects; however, the medium value about 0.4 is the best w/b to reach high slump without too much effort on trying to find the appropriate water content and SP/b.