Lin R.,Sanming University |
Fan C.,Shandong University
Journal of Convergence Information Technology | Year: 2012
Packet sets are a novel mathematical model, which is a set pair composed of internal Packet set X F (internal packet set X F) and outer packet set X F (outer packet set X F), and has the dynamic characteristics. Using the dynamic characteristics of packet sets, this paper gives the concept and characteristics of inward-convergence information. Moreover, a series of inward-convergence information theorems are presented and the application in the unknown information discovery and identification. Packet sets are a novel method and theory in the research of the dynamic information system.
Liu J.J.,Sanming University
Energy and Environmental Engineering - Proceedings of the International Conference on Energy and Environmental Engineering, ICEEE 2014 | Year: 2015
Bamboo is a kind of annual output of high biomass material. Green Bamboo has a 12,000 kg yield per hectare, and is very suitable for the production of cellulosic ethanol.We use Green Bamboo as a kind of biomass; it will simplify the processes and reduce production costs. It is pretreated with hot water, liquid ammonia, and steam explosion. Then cellulase and amylase for hydrolysis are added. Analysis is made from the samples of hydrolysis solution and filtrate by HPLC (high performance liquid chromatography), using the Biorad Aminex HPX-87H column for glucose, xylose, and arabinose. The results showed that the glucan/xylan conversion was greatest under hot water conditions for ten minutes. They were 28.45% and 45.55% respectively, compared with untreated biomass where they increased by 111.07% and 224.23%. The research conclusion has important significance for biomass energy conversion and utilization. © 2015 Taylor & Francis Group, London.
Xiao B.,Sanming University
Modern Physics Letters B | Year: 2010
In this paper, dependence of active nucleation site density on boiling surfaces are developed. For pool boiling heat transfer, a mathematical model is derived based on statistical treatment using the probability density function of the cavity mouth radius and existing correlation for active nucleation site density, the volume of single bubble at departure, the bubble departure diameter and the bubble departure frequency. The proposed model is expressed as a function of wall superheat, the contact angle, maximum and minimum active cavities, and physical properties of fluid. It is shown that the wall heat flux can be determined by the consideration of the variation of the cavity mouth radius. A good agreement between the proposed model predictions and experimental data is found for different contact angles. It also turns out that the present model explains well the mechanism on how wettability affects the pool boiling. © 2010 World Scientific Publishing Company.
Yan H.,Tongji University |
Yan H.,Sanming University |
Jin B.,Tongji University
European Physical Journal E | Year: 2013
Immersed in an ionic solution, a network of polyampholytic polyelectrolyte imbibes the solution and swells, resulting in a polyampholytic p H-sensitive hydrogel, which can respond to changes in the surrounding environmental p H. This paper formulates a continuum field theory for polyampholytic p H-sensitive hydrogels by considering the reaction of hydrogen ions with hydroxide ions, which has been ignored in our previous paper (H.X. Yan, B. Jin, Eur. Phys. J. E 35, 36 (2012)). Comparison with experimental data shows that the proposed continuum field theory, by considering that the reaction of hydrogen ions with hydroxide ions would be more reasonable, can not only give a good qualitative but also a good quantitative prediction of the dependence of swelling on p H and crosslinker. The theory is then applied to study the influence of chain entanglements, salt concentration, uniaxial tension and geometric constraint on mechanical behavior of polyampholytic p H-sensitive hydrogels. © 2013 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
Zhang H.,Ningbo University |
Chen L.,Sanming University |
Zhang J.,Ningbo University |
Chen J.,Xiamen University
Energy | Year: 2014
The model of a packed bed anode DCFC (direct carbon fuel cell) with molten carbonate as an electrolyte and graphite as a fuel is established to globally evaluate its performance. Thermodynamic-electrochemical analyses on the performance of the DCFC are implemented, in which the activation overpotential, ohmic overpotential, and concentration overpotential are taken as the main sources of voltage losses. The analytical expressions for the cell voltage, power output, efficiency, and entropy production rate are derived, from which the general performance characteristics are discussed in detail. At the anode, the ohmic overpotential in each slab resulting from the carbon phase is found to be about three orders of magnitude larger than that resulting from the electrolyte phase. The radius of the real contact area between two neighboring graphite particles decreases at an accelerating rate as one goes up in the bed, and the corresponding constriction resistance will increase at an accelerating rate. The decrease in the operating current density and anode dimension and the increase in the operating temperature will lessen the overall ohmic overpotential. The effects of the operating current density, operating temperature and anode dimension on the performance are discussed, and the optimum criteria for some important performance parameters are determined. © 2014 Elsevier Ltd.