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	1. The exchange of acetaldehyde between the atmosphere and plants and its forming mechanism
	Huang Juan
	Environmental Science and Techology 30 June 2008
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	Abstract:The exchange of acetaldehyde between atmosphere and plant leaves includes three processes: 1) acetaldehyde is emitted from plant leaves; 2) acetaldehyde in the atmosphere deposits to the leaf-surface; and 3) acetaldehyde is absorbed and metabolized by plants. The physiological and environmental factors which controlling these processes were reviewed. Acetaldehyde emission from plants in some unfavorable environment functions as external signal for within-plant communication, serving also a systemic response to local damage. The mechanism of acetaldehyde production was also discussed. With the capability of absorbing acetaldehyde, plants can be used to detoxify the air. Phytoremediation will be one of the most promising approaches for cleaning up the air organic pollutants. While, plants are also important pools of acetaldehyde production, especially under environmental stresses such as flooding and anaerobic condition.
	TO cite this article:Huang Juan . The exchange of acetaldehyde between the atmosphere and plants and its forming mechanism[OL].[30 June 2008] http://en.paper.edu.cn/en_releasepaper/content/22558


	2. Toxicity of Uranium and Lead to B.subtilis
	liuqing,Xu weichang,Zhao guodong,Zhao youcai
	Environmental Science and Techology 05 April 2007
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	Abstract:B.subtilis has the broad foreground in dealing with the heavy metals waste water. It is necessary to study the toxicity of heavy metals to B.subtilis and get “the Maximum No-Effect Level ” and “the Lethal Concentration”.The toxicity of different concentration Uranium and Lead to B.subtilis in its growth was studied by three different methods in terms of measuring the diameter of the circle of bacteriostasis, counting the bacterial population by Heamacytometer and observing the change of the shape and the density of the bacteria through microscope. The experimental results have indicated that these two heavy metals had great inhibition effect to the growth of B.subtilis. The Maximum No-Effect Level of Uranium and Lead to B.subtilis are below 1mg/L and the Lethal Concentration of Uranium and Lead to B.subtilis are 500mg/L and 1000mg/L respectively. In these methods used for the toxicity of heavy metals to microorganism，counting the bacterial population are more sensitive.
	TO cite this article:liuqing,Xu weichang,Zhao guodong, et al. Toxicity of Uranium and Lead to B.subtilis[OL].[ 5 April 2007] http://en.paper.edu.cn/en_releasepaper/content/11986


	3. Construction and Application of Transient Hydraulic Model of Urban Water Supply Distribution Network
	Chen Ling,Liu Sui-qing,Li Shu-ping
	Environmental Science and Techology 03 February 2007
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	Abstract:This paper presented a new method to construct transient model on basis of steady model： First, it calculated the evaluation value of transient flow to decide the requirement of transient analysis; Second, it used the statistic model to confirm the calculation bound and signed the distribution network; Third, when boundary conditions and other systematic parameters had been confirmed, the equations of transient could be solved using the Method of Characteristics (MOC); At last, it calibrated the model based on testing data. Contrast to traditional method, this method integrates transient model with steady model seamlessly in the process of constructing the dynamic hydraulic model of water supply distribution network, which extends the application aspect , and can be used to safety analysis of distribution network to guard against accident, such as pipe burst.
	TO cite this article:Chen Ling,Liu Sui-qing,Li Shu-ping. Construction and Application of Transient Hydraulic Model of Urban Water Supply Distribution Network[OL].[ 3 February 2007] http://en.paper.edu.cn/en_releasepaper/content/11032

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