It is commonly assumed that the application of solar power system can save energy and relief global climate change. Presented in this study is the account of energy performance and greenhouse gas emissions of a planne...
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It is commonly assumed that the application of solar power system can save energy and relief global climate change. Presented in this study is the account of energy performance and greenhouse gas emissions of a planned solar tower power plant in China based on the life cycle analysis method. The conservative estimation of energy cost for the concerned plant is 1.21 times of the electricity output, which is a relatively decent performance amongst power generation technologies. In order to analyze the greenhouse gas performance, a comparison is carried out between the solar tower power plant and conventional coal-fired power plant in China. Results show the application of this solar system obtains a net greenhouse gas emission reduction of 0.31E+06 ton CO2 equivalent, during its operating period of twenty years. It is believed that this successful example can lend solid support to a future wide use of solar power in China.
We study quantum transport in a general graphene system subject to external potential, a situation that can be expected in all kinds of future graphene-based electronic devices with quantum dots and quantum point cont...
We study quantum transport in a general graphene system subject to external potential, a situation that can be expected in all kinds of future graphene-based electronic devices with quantum dots and quantum point contacts. We find that electrons tend to take on propagating paths due to Klein tunneling that have absolutely no counterpart in nonrelativistic quantum systems. Strikingly, such abnormal quantum paths can lead to an extreme type of fractal-like of conductance fluctuations, not seen previously in any quantum transport systems. This phenomenon has profound implications to the development of graphene based devices that require stable electronic properties.
A novel alkanolamine-based ionic liquid,N-methyl-diethanolammonium tetrafluoroborate ([MDEA][BF4]),was synthesized in our *** ionic liquid-based composite solution consisting of N-methyl-diethanolamine (MDEA),[MDEA][B...
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A novel alkanolamine-based ionic liquid,N-methyl-diethanolammonium tetrafluoroborate ([MDEA][BF4]),was synthesized in our *** ionic liquid-based composite solution consisting of N-methyl-diethanolamine (MDEA),[MDEA][BF4],piperazine (PZ) and H2O was investigated for CO_(2) *** optimal performance for CO_(2) capture was found at 45°C,1.50 MPa,probably due to a synergistic action of the reaction and the *** apparent corrosion was found on stainless and carbon steel with the above composite *** finding is very significant to the promotion of its engineering application.
The safety and reliability are the soul of nuclear power plant. Until now, the solution to assure the safety and reliability is still not smart and reasonable enough because its strict management, standards and law ar...
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The safety and reliability are the soul of nuclear power plant. Until now, the solution to assure the safety and reliability is still not smart and reasonable enough because its strict management, standards and law are made and executed with human's experience and knowledge. By using of the latest IT technology, “Product Lifecycle Management” software can be developed where “top-down” plan method is combined with “down-top” design method to assure the safety and reliability of the product. Nuclear power system is a typical complex system consisting of many dynamic factors, and the conventional control, simulation and management technology can't assure the safety and reliability of its operation and management. Then, parallel system method is proposed in the paper, where includes the basic principle and its successful applications, ACP method, i.e. Artificial systems, Computing experiments, and Parallel execution methods, which is applied in PnTS, PnES and PnMS for nuclear power.
With the advantage of simulating the details of a transportation system, the “microsimulation” of a traffic system has long been a hot topic in the Intelligent Transportation systems (ITS) research. The Cellular Aut...
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With the advantage of simulating the details of a transportation system, the “microsimulation” of a traffic system has long been a hot topic in the Intelligent Transportation systems (ITS) research. The Cellular Automata (CA) and the Multi-Agent System (MAS) modeling are two typical methods for the traffic microsimulation. However, the computing burden for the microsimulation and the optimization based on it is usually very heavy. In recent years the Graphics processing Units (GPUs) have been applied successfully in many areas for parallel computing. Compared with the traditional CPU cluster, GPU has an obvious advantage of low cost of hardware and electricity consumption. In this paper we build an MAS model for a road network of four signalized intersections and we use a Genetic Algorithm (GA) to optimize the traffic signal timing with the objective of maximizing the number of the vehicles leaving the network in a given period of time. Both the simulation and the optimization are accelerated by GPU and a speedup by a factor of 195 is obtained. In the future we will extend the work to large scale road networks.
In this work,we report some new experimental results on the deformation and fracture of PZT ferroelectric ceramics and BaTiO3 single *** explore the mechanism of crystal-symmetry deformation behavior of PZT ceramics,w...
In this work,we report some new experimental results on the deformation and fracture of PZT ferroelectric ceramics and BaTiO3 single *** explore the mechanism of crystal-symmetry deformation behavior of PZT ceramics,we fabricate tetragonal PZT (45/55),morphotropic PZT (52/48) and rhombohedral PZT (60/40),respectively,and determine the phase structures and lattice constants using powder XRD and Rietveld refinement.
Wettability of molten Sn-Ag-Cu alloy on Cu substrate has been determined by sessile drop method, as well as its dependence on time and temperature. It was found that the evolution of contact angle at the alloy’s melt...
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Wettability of molten Sn-Ag-Cu alloy on Cu substrate has been determined by sessile drop method, as well as its dependence on time and temperature. It was found that the evolution of contact angle at the alloy’s melting point experienced four different stages. Especially, the contact angle was unstable and fluctuant in stage II, and gradually decreased in stage III mainly due to a chemical reaction between Sn-Ag-Cu alloy and Cu substrate. The contact angle decreased with increasing temperature, but increased slightly at 629 K, for another chemical reaction occurred. Interfacial characteristic has been further investigated by examining the sample’s cross section. Intermetallic compounds of Cu6Sn5 and β-Sn phase were found at the interface of Sn-Ag-Cu/Cu.
A computational study was performed to investigate the effects of diluents (He, Ar, or CO2) on the ignition of premixed H2/air mixtures. The objective of this study was to assess and explain the change of the minimum ...
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A computational study was performed to investigate the effects of diluents (He, Ar, or CO2) on the ignition of premixed H2/air mixtures. The objective of this study was to assess and explain the change of the minimum ignition energies (MIE) with the dilution ratio. It was found that, at the same dilution ratio, the MIE of He dilution was always higher than that of Ar dilution. The MIE of CO2 dilution was between those for He and Ar dilution at a low value of the dilution ratio, while it was higher than those for He and Ar dilution at a high value of the dilution ratio. The thermal and flame-dynamic effects of dilution were discussed to explain the change of the MIE with the dilution ratio.
An interfacial study between molten iron and the prereduced ilmenite with carbon was conducted at different melting temperatures by the sessile droplet *** wetting characteristics between molten iron and the prereduce...
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An interfacial study between molten iron and the prereduced ilmenite with carbon was conducted at different melting temperatures by the sessile droplet *** wetting characteristics between molten iron and the prereduced ilmenites with carbon were investigated by measuring contact angle of the droplet of molten iron on the prereduced ilmenite *** images of the interface were also examined by the optical microscope and SEM equipped with *** volume of molten iron increased with the melting temperature increasing when titania or high-content titania slag was used as the *** contact angle decreased with the melting temperature increasing and it was independent on time at constant *** contact angle was positively correlated with the reduction degree of the ilmenite,but the work of adhesion was negatively correlated with *** smelting temperature was beneficial to the separation of iron and Ti *** permeability of molten iron into the prereduced ilmenite with carbon was more obvious with reduction degree increasing owing to the high porosity of prereduced ilmenite.
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