Plotinus＇ account of matter in Ennead III 6[26] 11-15 serves two purposes. The terms, evil and ugly, present the negative side of matter＇s causality, providing for the change characteristic of the sensible world and...Plotinus＇ account of matter in Ennead III 6[26] 11-15 serves two purposes. The terms, evil and ugly, present the negative side of matter＇s causality, providing for the change characteristic of the sensible world and the possibility of ontological evil and privation as well as of moral evil among human beings. The receptacle and other images from Plato＇s Timaeus present the positive side of this causality, matter as allowing for the presence of forms in the bodies of the sensible world. Plotinus explicitly articulates the linguistic problem surrounding the nature of matter, since language is derived from the corporeal and thus needs constant correction when applied to matter as incorporeal. His use of language, thus, always has two phases, first, capturing the nature of matter as aptly as possible, and second, highlighting the difference between matter and the image, analogy, or metaphor used to help explain it.展开更多
Language learning must be conducted on the basis of acquisition, and the acquisition needs a certain environment as the material guarantee for the implementation of the learning activities. In China, English teaching ...Language learning must be conducted on the basis of acquisition, and the acquisition needs a certain environment as the material guarantee for the implementation of the learning activities. In China, English teaching lacks an advantageous learning environment as a Foreign Language （EFL） Teaching, which is one of main factors that more time is spent on the teaching but efficiency is not improved correspondingly. Therefore, we should attach more importance to the present situation and its causes. In this essay, present Situation is analyzed through the practical research, and the causes are explored to help to improve the efficiency of foreign language learning.展开更多
This paper deals with two basic issues of fuel cell research： modelling and experimental validation. In particular, the EIS （electrochemical impedance spectroscopy） technique is applied to a PEMFC （proton exchange...This paper deals with two basic issues of fuel cell research： modelling and experimental validation. In particular, the EIS （electrochemical impedance spectroscopy） technique is applied to a PEMFC （proton exchange membrane fuel cell）. Experiments have been performed using a low-cost test bench and instrumentation developed around a 1,200 W Ballard Nexa fuel cell system. An electrical and dynamic model in VHDL-AMS language for PEM fuel cell stack is described. The privileged approach in this paper is an electrical method. Few papers deal with the modelling of a fuel cell in VHDL-AMS language with an electric approach. The fuel cell is characterised cell wise in VHDL-AMS; AC and DC measurements show the good agreement between the simulation results of the model and those measured in experiments. The model is capable to predict accurate stack profiles. The model is validated using temporal and impedance spectroscopy method; the impedance spectroscopy is performed at low and high frequencies. The experimental and simulated Nyquist plots show that the frequency response of the fuel cell stack can be predicted by the proposed fuel cell stack model. At high frequencies, comparisons between experimental and model impedance results are performed and show some similarities between the two Nyquist. Error between the two approaches is below 1.5%.展开更多
文摘Plotinus＇ account of matter in Ennead III 6[26] 11-15 serves two purposes. The terms, evil and ugly, present the negative side of matter＇s causality, providing for the change characteristic of the sensible world and the possibility of ontological evil and privation as well as of moral evil among human beings. The receptacle and other images from Plato＇s Timaeus present the positive side of this causality, matter as allowing for the presence of forms in the bodies of the sensible world. Plotinus explicitly articulates the linguistic problem surrounding the nature of matter, since language is derived from the corporeal and thus needs constant correction when applied to matter as incorporeal. His use of language, thus, always has two phases, first, capturing the nature of matter as aptly as possible, and second, highlighting the difference between matter and the image, analogy, or metaphor used to help explain it.
文摘Language learning must be conducted on the basis of acquisition, and the acquisition needs a certain environment as the material guarantee for the implementation of the learning activities. In China, English teaching lacks an advantageous learning environment as a Foreign Language （EFL） Teaching, which is one of main factors that more time is spent on the teaching but efficiency is not improved correspondingly. Therefore, we should attach more importance to the present situation and its causes. In this essay, present Situation is analyzed through the practical research, and the causes are explored to help to improve the efficiency of foreign language learning.
文摘This paper deals with two basic issues of fuel cell research： modelling and experimental validation. In particular, the EIS （electrochemical impedance spectroscopy） technique is applied to a PEMFC （proton exchange membrane fuel cell）. Experiments have been performed using a low-cost test bench and instrumentation developed around a 1,200 W Ballard Nexa fuel cell system. An electrical and dynamic model in VHDL-AMS language for PEM fuel cell stack is described. The privileged approach in this paper is an electrical method. Few papers deal with the modelling of a fuel cell in VHDL-AMS language with an electric approach. The fuel cell is characterised cell wise in VHDL-AMS; AC and DC measurements show the good agreement between the simulation results of the model and those measured in experiments. The model is capable to predict accurate stack profiles. The model is validated using temporal and impedance spectroscopy method; the impedance spectroscopy is performed at low and high frequencies. The experimental and simulated Nyquist plots show that the frequency response of the fuel cell stack can be predicted by the proposed fuel cell stack model. At high frequencies, comparisons between experimental and model impedance results are performed and show some similarities between the two Nyquist. Error between the two approaches is below 1.5%.
