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221.
In this study, we examined how and when transformational leadership affected team knowledge exchange. Taking a goal pursuit perspective, we hypothesized two parallel mediating mechanisms—team knowledge goal generation and team knowledge goal striving—linking transformational leadership to team knowledge exchange. In addition, we investigated whether team-level team-member exchange served as a boundary condition that qualified the effects of transformational leadership on team knowledge goal generation and striving. We tested our hypotheses using time-lagged data from 118 work teams of a large Chinese manufacturing firm. Our findings provided support for the proposed parallel mediating mechanisms (i.e., team knowledge goal generation and team knowledge goal striving) that linked transformational leadership to team knowledge exchange. In addition, we found that team-level team-member exchange could strengthen the positive effect of transformational leadership on team knowledge exchange via team knowledge goal generation. By taking the novel lens of team goal pursuit, this study contributes to the literature on leadership and teams by shedding light on how transformational leadership triggers the goal pursuit process of team knowledge exchange. 相似文献
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This paper focuses on constrained confidence intervals in the context of environmental time series studies where one seeks to ascertain the effects of ambient air pollution on human mortality. If the regression parameter representing such effects is non-negative, corresponding to a belief that more pollution cannot be beneficial, a desirable goal is to produce a constrained confidence interval for the parameter which is entirely non-negative. We show how this goal can be achieved using the method of tail functions. The proposed methodology is illustrated by the application to an environmental study of 100 cities in the United States involving regressions of mortality counts on levels of particulate matter air pollution. The large number of constrained CIs that contain zero is an indication that for the majority of the 100 cities there is not enough evidence to conclude a positive association between air pollution and mortality. 相似文献
226.
A novel direct equipartition ray design (EquRay) procedure for toxicity interaction between ionic liquid and dichlorvos 总被引:2,自引:0,他引:2
Dou RN Liu SS Mo LY Liu HL Deng FC 《Environmental science and pollution research international》2011,18(5):734-742
Background, aim and scope
Pollutants always co-exist in the environment. Determining and characterizing the interaction among chemicals is an important issue. Experimental designs (ED) play an important role in evaluating the interactions. The main aim of our study is to provide the test and analysis of the toxicity interaction with a novel ED method. 相似文献227.
Xianglong Luo Yongzhen Wang Jun Zhao Ying Chen Songping Mo Yulie Gong 《International Journal of Green Energy》2016,13(1):14-27
With the drastic decrease in fossil resources and rapid deterioration of the global environment, the utilization of geothermal resources has been strongly advocated. The combination of heat, power, and cold utility generation is commonly used to increase the utilization efficiency of geothermal resources. In this study, an integrated cascade utilization system of waste geothermal water (ICUWGW) from a flash geothermal power plant in China is established to increase the utilization efficiency of geothermal water. The waste geothermal water leaving the power plant is proposed for further use in cascade for two-stage LiBr/H2O absorption cooling, agricultural product drying, and residential bathing. Twelve candidate temperature schemes showing different inlet and outlet temperatures of every subsystem are proposed for the ICUWGW. Several criteria are selected for the evaluation and screening of the candidate schemes. Grey relational analysis incorporating analytic hierarchy process is conducted to screen the optimal temperature scheme for the ICUWGW to meet the comprehensive criteria of thermodynamics and economics. Results show that the optimal scheme features significant improvement in energy efficiency, exergy efficiency, and equivalent electricity generation efficiency compared with those of the current geothermal power plant. The investment payback time of the additional subsystems for cooling, drying, and bathing is 1.85 years. Exergy analysis is also conducted to determine the further optimization potential of the optimal ICUWGW. Sensitivity analysis of electricity price on the performance of the optimal ICUWGW is also performed. 相似文献
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Zhang Cheng Cheung-Lung Lam Wing-Yin Mo Xiang-Ping Nie Wai-Ming Choi Yu-Bon Man Ming-Hung Wong 《Environmental science and pollution research international》2016,23(8):7195-7203
The major purpose of this study was to use different types of food wastes which serve as the major sources of protein to replace the fish meal used in fish feeds to produce quality fish. Two types of food waste-based feed pellets FW A (with cereals) and FW B (with cereals and meat products) and the commercial feed Jinfeng® were used to culture fingerlings of three low-trophic-level fish species: bighead carp, grass carp, and mud carp (in the ratio of 1:3:1) for 1 year period in the Sha Tau Kok Organic Farm in Hong Kong. Heavy metal concentrations in all of the fish species fed with food waste pellets and commercial pellets in Sha Tau Kok fish ponds were all below the local and international maximum permissible levels in food. Health risk assessments indicated that human consumption of the fish fed with food waste feed pellets was safe for the Hong Kong residents. The present results revealed that recycling of food waste for cultivating low-trophic-level fish (mainly herbivores and detritus feeders) is feasible, and at the same time will ease the disposal pressure of food waste, a common problem of densely populated cities like Hong Kong. 相似文献
229.
Species- and tissue-specific accumulation of Dechlorane Plus in three terrestrial passerine bird species from the Pearl River Delta, South China 总被引:1,自引:0,他引:1
Little data is available on the bioaccumulation of Dechlorane Plus (DP) in terrestrial organisms. Three terrestrial passerine bird species, light-vented bulbul, long-tailed shrike, and oriental magpie-robin, were collected from rural and urban sites in the Pearl River Delta to analyze for the presence of DP and its dechlorinated products in muscle and liver tissues. The relationships between trophic level and concentration and isomeric composition of DP in birds were also investigated based on stable nitrogen isotope analysis. DP levels had a wide range from 3.9 to 930 ng g−1 lipid weight (lw) in muscle and from 7.0 to 1300 ng g−1 lw in liver. Anti-Cl11-DP and syn-Cl11-DP, two dechlorinated products of DP, were also detected in bird samples with concentrations ranged between not detected (nd)-41 and nd-7.6 ng g−1 lw, respectively. DP preferentially accumulated in liver rather than in muscle for all three bird species. Birds had significantly higher concentrations of DP in urban sites than in rural sites (mean, 300 vs 73 ng g−1 lw). The fractions of anti-DP (fanti) were higher in birds collected in rural sites than in urban sites. Significant positive correlation between DP levels and δ15N values but significant negative correlation between fanti and δ15N values were found for birds in both urban and rural sites, indicating that trophic level of birds play an important role in determining DP level and isomeric profile. 相似文献
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Burkhard Wilske Mo Bai Beate Lindenstruth Martin Bach Zahra Rezaie Hans-Georg Frede Lutz Breuer 《Environmental science and pollution research international》2014,21(16):9453-9460
Superabsorbent polymers (SAP) are used, inter alia, as soil amendment to increase the water holding capacity of soils. Biodegradability of soil conditioners has become a desired key characteristic to protect soil and groundwater resources. The present study characterized the biodegradability of one acrylate based SAP in four agricultural soils and at three temperatures. Mineralisation was measured as the 13CO2 efflux from 13C-labelled SAP in soil incubations. The SAP was either single-labelled in the carboxyl C-atom or triple-labelled including additionally the two C-atoms interlinked in the SAP backbone. The dual labelling allowed estimating the degradation of the polyacrylate main chain. The 13CO2 efflux from samples was measured using an automated system including wavelength-scanned cavity ring-down spectroscopy. Based on single-labelled SAP, the mean degradation after 24 weeks varied between 0.45 % in loamy sand and 0.82 % in loam. However, the differences between degradation rates in different soils were not significant due to a large intra-replicate variability. Similarly, mean degradation did not differ significantly between effective temperature regimes of 20° and 30 °C after 12 weeks. Results from the triple-labelled SAP were lower as compared to their single-labelled variant. Detailed results suggest that the polyacrylate main chain degraded in the soils, if at all, at rates of 0.12–0.24 % per 6 months. 相似文献