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Abstract: In this paper we give an overview of the situation of CO2 emissions in both Beijing and Tokyo and discuss and compare the causes for their emission changes according to decomposition based on both social activities and fuel varieties. We find that in order to enjoy a sustainable development, Beijing needs to learn from Tokyo especially in energy consumption area. At the end of the paper, the cooperation between these two metropolises is summarized. [Copyright &y& Elsevier]

Abstract: Energy consumption is a technical issue or a spatial structure issue? Aim of this paper is to study the impact of population density and energy consuming density to space together on energy consuming with urban districts of Beijing. The author of this paper puts two kinds of factors including economic and technological ones, and urban space context factors with energy consuming together into a model. LMDI method will be employed to do the analysis. It is concluded that non-economic and non-technological factors were also significant to reduce energy consumption. Even population density did not contribute to reduction of energy consuming, when it was combined with energy consuming density to space together, the contribution was efficient. It indicates that compacted urban space with low-carbon city is the most efficient way to reduce energy consuming in urban areas. © 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of RIUDS [Copyright &y& Elsevier]

Abstract: With the reform and development of the civil aviation industry in China, the three major group airlines, Air China,China Southern and China Eastern Airlines, were recomposed in the year 2002. The new composition of the threemajor Group Airlines represents the market competition of civil aviation industry has entered a new period.Based on the air route theory and the air route development of Air China, this paper conducts a deep analysis ofthe hub air route construction of Air China Beijing through the following two points: A systematic research into thepresent air route networks of Air China, which provides a necessary foundation for future research into the air routenetworks of the company; Discussing the hub air route networks of Air China in detail based on the marketbackground and competition analysis of the present air route networks. [Copyright &y& Elsevier]

Abstract: GPR (Ground penetrating radar) is one kind of the detection technologies with rapid, non-destruction, uninterrupted detection, and high-resolution. GPR can be applied to detect underground holes and loose soil layer and the other baneful anomalies, and therefore is widely applied to hole survey of the subway project in recent years. Based on briefly describing engineering geological background between F station and L station of a subway project in Beijing, this paper gives the arrangement method of GPR survey line in the construction area of shield method, analyzes detection results, verifies an anomaly by spading, determines the distribution range and its characteristic of the hole anomalies. The results showed that three obvious anomalies were detected in the area between F station and L station, and seriously loose soil layer was the cause of No. 1 and No. 3 anomalies, and hole was the cause of No. 2 anomaly. Thereby the anomalies of loose soil layer and hole could be detected accurately by the GPR technology, and then basic data of underground holes could be obtained. On the base of analyzing these data, effective measures could be adopted to avoid the hidden danger, then the safety of subway construction and surrounding environment of the subway project could be ensured. [Copyright &y& Elsevier]

Abstract: The use of groundwater flow models is prevalent in the field of environmental hydrogeology. Models have been applied to investigate a wide variety of hydrogeological conditions. Recently, groundwater models have been applied to predict the fate and transport of contaminants for risk evaluation purposes. In this paper, a transient groundwater flow model in Daxing district of Beijing, China was developed. The conceptual model was built by analyzing the hydrogeological data. Hydraulic conductivities have been calibrated by the steady state model. The storage coefficients are calibrated by the transient model based on the available data observed from 1995 to 2000, which provides insights to understand the dynamic behavior of groundwater systems and to predict spatial-temporal distributions of groundwater levels in responding to changes. The model results help to identify the aquifer properties and to analyze the groundwater flow dynamics, the changes of groundwater levels, in addition, the improvement of the groundwater level monitoring network will be proposed through the analysis of groundwater levels. The calibrated transient model will be used later to predict the impacts of water resources management schemes on groundwater in the study area. [Copyright &y& Elsevier]

Abstract: The high electric power consumption of air conditioning in communication base station needs to be solved urgently. This paper presents a new technology to discharge excess heat from a communication plant by utilizing the heat exchanger when the outdoor temperature is low enough. Then it compares the applied effects between two types of heat exchanger in a typical base station located in Beijing of China. It is found that this technology is feasible in Beijing of China. The plate heat exchanger can cool the station instead of air conditioning for about 5014hours each year, and the corresponding electronic power saving rate reaches up to 29%. The plate heat exchanger applied effects are superior to the heat pipe heat exchanger. [Copyright &y& Elsevier]

Abstract: In this paper, the college students in Beijing as the research object, 569 Beijing college students are involved in the questionnaire survey about the online shopping problem. Research index involves the group characteristics, website category, product category, payment form, logistics distribution and rights complaints of network shopping. Based on the statistical analysis of feedback data, it is shown that 76% of Beijing college students have had experience of online shopping, among which the ratio between boys and girls is 79:73. Most of the online shopping commodities belong to the category of sportswear and stationery. 85% of the students will be influenced by the evaluation and assessment from online shops to make consumptions. In addition, the survey also found that University students are dissatisfied with the logistics related to online shopping and the corresponding rights defense, which should be greatly strengthened. [Copyright &y& Elsevier]

Abstract: The citizen''s environmental behaviours will directly affect the urban ecological environment construction. In order to provide the references for construction of ecological city in Beijing, this paper takes the citizen''s environmental behaviours in Beijing as a breakthrough point to analyze the status of citizen''s environmental behaviours and research their influence factors by constructing a structural equation model with the sampling survey data. [Copyright &y& Elsevier]

Abstract: This paper successfully builds synthesized evaluation index system of Beijing urbanization and city source, and uses rincipal component analysis to reasonably measure and calculate the level of comprehensive development about hem from 1985 to 2008, by which empirical research is conducted about their dynamic relationship. Then it turns out hat there is a kind of co-integration relationship between these two factors: the long-term monodirectional Granger ausality relationship that city source restricts urbanization development. The result showed that the present key to rbanization development of Beijing is source, thus to establish a mode that contributes to promot e the source-saving rbanization, is the basic way to its sustainable development. [Copyright &y& Elsevier]