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Articles by CHEN Wei
Total Records ( 4 ) for CHEN Wei
  Allam Maalla , Chen Wei and Haitham J. Taha
  Problem statement: Most mobile nodes in a wireless ad hoc network are powered by energy limited batteries; the limited battery lifetime imposes a constraint on the network performance. Therefore, power consumption of network operations is critical and subject to optimization. Approach: A novel hybrid PSO was proposed for solving the minimum power multicast problem in wireless ad-hoc networks. The MPM problem has been mathematically formulated to a constrained optimization problem using hybrid PSO. Results: In results, we considered that the centralized algorithm requiring a global knowledge of the networks is impractical in large wireless networks, the distributed version of the centralized algorithm requiring multihop neighborhood information under the assumption that limited frequency band is available. Conclusion: A variety of simulations were conducted to examine the performance of the proposed approach and the results show that our algorithm consistently outperforms existing techniques.
  Chai Hongxiang and Chen Wei
  The complexity of the water-saving project in green buildings when analyzing its Life cycle cost (LLC) renders analytic methods very difficult to be applied. The objective of this study is to conduct a Life Cycle Assessment (LCA) on comprehensive benefit model for water saving in green buildings. Monte Carlo methodology, which substitutes point estimates with random numbers obtained from probability density functions and then builds models of possible results, was applied to calculation in this study. Crystal Ball is utilized to carry out the uncertainty analysis. The most relevant parameters in comprehensive water-saving benefits are identified, which are the annual growth rate in stable phase of water price, discount rate and annual growth rate in transitional period of water price.
  Wu Yingben , He Yuelin , Yin Hongmei , Chen Wei , Wang Zhen , Xu Lijuan and Zhang Aiqun
  Microorganisms have been obtained to improve the agronomic value of Rock Phosphates (RPs), but the phosphorus solubilizing rate by these approaches is very slow. It is important to explore a high-efficient phosphate-solubilizing approach with a kind of microorganisms. This study aimed to isolate a high-efficient level of phosphate-solubilizing fungus from rhizosphere soil samples phosphate mines (Liuyang County, Hunan province, China) and apply it in solubilization of RPs. The experiments were carried out by the conventional methodology for morphological and biochemical fungus characterization and the analysis of 18s rRNA sequence. Then the effects of time, temperature, initial pH, phosphorus (P) sources, RPs concentration, shaking speed and silver ion on the content of soluble P released by this isolate were investigated. The results showed this isolate was identified as Galactomyces geotrichum P14 (P14) in GeneBank and the maximum amount of soluble P was 1252.13 mg L-1 within 40 h in a modified phosphate growth agar’s medium (without agar) where contained tricalcium phosphate (TCP) as sole phosphate source. At the same time, it could release phosphate and solubilize various rock phosphates. The isolated fungus can convert RPs from insoluble form into plant available form and therefore it hold great potential for biofertilizers to enhance soil fertility and promote plant growth.
  YANG Dan , QI Shi-Hua , ZHANG Jia-Quan , TAN Ling-Zhi , ZHANG Jun-Peng , ZHANG Yuan , XU Feng , XING Xin-Li , HU Ying , CHEN Wei , YANG Jun-Hua and XU Mei-Hui
  A soil survey was conducted in Zhangzhou City, an important agricultural region in south of the Fujian Province, China. 93 surface soil samples were collected in the paddy fields, vegetable lands, orchards and tea plantations from Zhangzhou City. An additional soil profile was sampled in a paddy field as previous research had indicated high concentrations of organochlorine pesticides (OCPs) in the paddy fields. Dichlorodiphenyltrichloroethanes (DDTs) ranged from 0.64–78.07 ng g−1 dry weight and hexachlorocyclohexanes (HCHs) ranged from 0.72–30.16 ng g−1 dry weight in the surface soil of the whole study region. Ratios of α-HCH/γ-HCH < 4 and o, p′-DDT/p, p′-DDT > 1 in all soil samples suggested that lindane and dicofol were widely applied in this region in the past. Concentrations of HCHs and DDTs in soils from the four land use types followed the orders: paddy fields > vegetable lands > tea plantations > orchards and tea plantations > orchards > paddy fields > vegetable lands, respectively. Analyses of the data showed no correlation (r < 0.1) between elevation and OCPs contents in paddy fields, orchards and vegetable lands, indicated no significantly different features in distribution of HCHs and DDTs in the soils from low lying plains and mountains and the unsystematic usage of OCPs, and highlighted the fragmented nature of agricultural production in Zhangzhou, as well as the reemission of OCPs from the soils, where high OCPs concentrations were found, in Longhai of Zhangzhou. In addition, no obvious relationship between the OCPs and total organic carbon (TOC) (r < 0.3) was observed in the soil profile. The mean contribution of dicofol in total DDTs was 66% in the whole Zhangzhou region. The approximate burdens of HCHs and DDTs in the surface layer of 0–20 cm were 0.44 and 1.55 t, respectively. The storage of both HCHs and DDTs in soil surface layer (0–20 cm) accounts for 40% burden of the soil layer of 0–50 cm (1.10 t HCHs and 3.87 t DDTs), in which the highest concentrations of OCPs were observed in soil profile.
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