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91.
The aim of this paper is to assess, through an empirical investigation, whether the performance of safety management systems (SMSs) adopting and non-adopting companies statistically differ. To achieve such aim, empirical data were collected on a sample of 116 companies, encompassing both SMSs adopters and non-adopters. Hypotheses testing was performed to assess whether SMSs adopters experience significantly higher performance against (i) definition of safety and security goals and their communication to employees; (ii) risk data updating and risk analysis; (iii) identification of risks and definition of corrective actions; (iv) employees training. Results show that companies adopting SMSs exhibit higher performance against all the topics identified. These outcomes could be the starting point for providing empirical evidence of benefits achievable thanks to SMSs implementation. 相似文献
92.
The discrepancy between verbal and actual commitment in waste recycling and environmental behavior is thought to have attenuated
the effectiveness of many environmental policy and measures. Studies purport to show the existence of such a value-action
gap in environmental issues has been largely based on matching the verbal commitment to environmental value through self-reported
environmental behavioral data. Therefore, there is a lack of direct evidence to prove that such a discrepancy exists. This
study demonstrates a methodology (contrasting on-site observation with self-reported results) to measure the gap between verbal
commitment and actual recycling behavior and provides an explanation on the recycling behavior of students at Hong Kong Baptist
University in the hope that the lessons learnt can be generalized to a wider context. Our findings indicate that a gap between
verbal recycling commitment and corresponding action does exist in waste recycling on this university campus. By using multiple
linear regression analysis, we found that the self-reported recycling behavior of undergraduates cannot be meaningfully explained
by most variables previously suggested in the general value-action model. 相似文献
93.
Sediment phosphorus extractants for phosphorus-31 nuclear magnetic resonance analysis: a quantitative evaluation 总被引:2,自引:0,他引:2
Ahlgren J De Brabandere H Reitzel K Rydin E Gogoll A Waldebäck M 《Journal of environmental quality》2007,36(3):892-898
The influence of pre-extractant, extractant, and post-extractant on total extracted amounts of P and organic P compound groups measured with 31P nuclear magnetic resonance (31P-NMR) in lacustrine sediment was examined. The main extractants investigated were sodium hydroxide (NaOH) and sodium hydroxide ethylenediaminetetraacetic acid (NaOH-EDTA) with bicarbonate buffered dithionite (BD) or EDTA as pre-extractants. Post extractions were conducted using either NaOH or NaOH-EDTA, depending on the main extractant. Results showed that the most efficient combination of extractants for total P yield was NaOH with EDTA as pre-extractant, yielding almost 50% more than the second best procedure. The P compound groups varying the most between the different extraction procedures were polyphosphates and pyrophosphates. NaOH with BD as pre-extractant was the most efficient combination for these compound groups. 相似文献
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This preview examines the background of UNCSTD, its agenda and objectives. It previews some issues concerning the choice and transfer of technology, a substantive item on the Conference agenda, and highlights the role in the Conference of scientists in natural resources and other fields. 相似文献
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Bianco Angelica Carena Luca Peitsaro Nina Sordello Fabrizio Vione Davide Passananti Monica 《Environmental Chemistry Letters》2023,21(2):647-653
Environmental Chemistry Letters - Microplastics are of rising health concerns because they have been detected even in remote and pristine environments, from the Artic snow to the Marianne Trench.... 相似文献
100.
Mutualisms are well known to influence individual fitness and the population dynamics of partner species, but little is known about whether they influence species distributions and the location of geographic range limits. Here, we examine the contribution of plant-pollinator interactions to the geographic range limit of the California endemic plant Clarkia xantiana ssp. xantiana. We show that pollinator availability declined from the center to the margin of the geographic range consistently across four years of study. This decline in pollinator availability was caused to a greater extent by variation in the abundance of generalist rather than specialist bee pollinators. Climate data suggest that patterns of precipitation in the current and previous year drove variation in bee abundance because of its effects on cues for bee emergence in the current year and the abundance of floral resources in the previous year. Experimental floral manipulations showed that marginal populations had greater outcross pollen limitation of reproduction, in parallel with the decline in pollinator abundance. Although plants are self-compatible, we found no evidence that autonomous selfing contributes to reproduction, and thus no evidence that it alleviates outcross pollen limitation in marginal populations. Furthermore, we found no association between the distance to the range edge and selfing rate, as estimated from sequence and microsatellite variation, indicating that the mating system has not evolved in response to the pollination environment at the range periphery. Overall, our results suggest that dependence on pollinators for reproduction may be an important constraint limiting range expansion in this system. 相似文献