Advanced Materials Research Vols. 171-172

Abstract: Based on the analysis of the cost of urbanization, this paper constructs the econometric model for broad and narrow sense economic cost of regional eco-urbanization, and carries out case study on urban system of Poyang Lake Eco-economic Zone. The results indicate that we should highlight the construction of small towns, and take a development road of new urbanization of balance development of large, medium-sized and small cities and towns. The Econometric model for cost of regional eco-urbanization provides a new quantitative and practical method for the study of urbanization, and this paper provides a practical way for urbanization development of undeveloped areas.

Abstract: This paper used input-output table and the energy consumption data by sector to estimate the effect of international trade on carbon emissions of China in 2007. The result shows that international trade has played a great part in increasing China’s carbon emissions. China is a net carbon exporter, with carbon emissions embodied in exports 583.4Mt, and emissions embodied in imports from 186.0 to 476.8 Mt, according to different assumptions taken. Besides, international trade increases the global emissions and makes the problem of global warming worse. Therefore the paper suggests that it is necessary to change the present ‘producer responsibility principle’ used in regional carbon accounting and allocate certain part of responsibility of the carbon emissions to consumers.

Abstract: Because of the limitations of network and hardware, early mobile CSCW platform is not used widely. With the continuing escalation of mobile network, the mobile high-speed network of 3G has been constructed completely and the hardware of mobile devices has been upgraded continuously. It provides a good foundation for the mature application of mobile CSCW. This paper presents a framework of mobile CSCW platform for 3G network and describes the specific implementation. In this paper, Web Service, Socket, XML technologies are used to build server-side, and SOAP, HTTPS, SAX, and Socket technologies are used to build client-side. This platform presented in this paper can help enterprises to increase work efficiency in any network environment.

Abstract: In order to give a scientific evaluation for teachers’ IT-based teaching abilities, an index system and a set of quantitative analyzing methods are put forward in this paper based on niche theory. By introducing the attributes about teachers’ “ecostate” and “ecorole”, the niche of IT-based teaching abilities is divided into four dimensions: tools and applications, resources and management, instruction and design, performance and development. According to these analyses, an evaluation index system and computational formulas are constructed. At last, in view of the curve of teachers’ “ecostate” and “ecorole”, the principle of teachers’ career development and concerning suggestions are presented. For teachers and schools, this method could work as a model to identify and evaluate IT-based teaching abilities properly.

Abstract: To co-construct and share OERs is a common goal of global for education fields. iTunes U is an open and free educational platform constructed on the basis of iTunes, which provides brand-new development conditions and ideas for the co-construction and sharing of OERs. This article first raises the key problems for the co-construction and sharing of OERs and then analyzes why it is not only possible but also necessary for iTunes U to support the development of OERs.

Abstract: In spring, autumn and winter, centralized air conditioning system frequently produces excessive cooling, if we use both air-energy saving system and water-energy saving system for directly cooling, replacing the chiller cooling, we can achieve the objective of energy saving. This paper introduces the air and water-energy saving system operation strategies to determine the operation control methods of different seasons. Through case analysis, it shows that this design is feasible. The system is stable and easy to control and management. It has obvious effect of energy-saving. If the air-energy saving system and water-energy saving system mode is adopted, the add-on investment of equipment can be recovered within one year, with a better economic benefits.

Abstract: In the world today, science and technology in natural disasters forecasting is changing with each passing day and is built up to a rather high level. But local, territorial, even just national or worldwide scope natural disasters have also posed a grave menace to human well-being and development. Therefore, researching on optimizing problem of vehicle routing for emergent relief supplies of multi-reserves, it is vital significant to quickly send relief supplies to the sufferers after sudden natural disasters. Then, we draw out the mathematical model and solve the problem reasonably based on the improved ant colony algorithm, at last, we obtain the satisfy results through an empirical exemple.

Abstract: Cluster-based topology is an energy-efficient topology control method in cognitive radio networks. The cluster head node depletes energy faster than cluster member node and the rotation of cluster head node is needed to balance the energy consumption for the whole network. Aimed at the problem of unbalanced residual energy of each node caused by cluster heads and cluster members in wireless cognitive radio network, a novel algorithm named cluster head rotating threshold (CHRT) is presented. In the proposed algorithm, rotation energy threshold is estimated using cluster head real-time energy load. The simulation results show that comparing with LEACH and EDAC, CHRT can realize the more network lifetime than the others.

Abstract: Solar water heating system is used to supply hot water all-year-round for a new dormitory building. Flat solar energy collectors are mounted on the roof. The hot water tank and pumps are installed together with the air conditioning equipments in the plant room. Air cooled heat pump is used to provide cooling in summer, and high temperature water from boiler room (in old building) is used as heat source in winter. Usually auxiliary heating is necessary to improve the stability and reliability of solar water heating system. In this case, we take full use of the equipment of air conditioning system instead of electricity as auxiliary heating resources. In this paper, we introduced the design of the solar water heating system and the auxiliary heating method by air conditioning systems. The control strategies to fulfill all the functions and switch between different conditions are also introduced.

Abstract: Load characteristics of the residential district is different from public buildings, so residential district of soil source heat pump air conditioner system operating characteristics are different from public buildings. Studies have been made on operating characteristics of soil source heat pump air conditioner system in a residential district in Qingdao, analyzing energy consumption of soil source heat pump air conditioner system and exploring its operation laws. It provides the basis for design, operation and control strategies of soil source heat pump system.