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171.
The aggregate income of oil-exporting countries relative to that of oil-poor countries has been remarkably constant in recent decades, despite the existence of structural gaps in productivity growth rates. This stylized fact is rationalized in an endogenous growth model of asymmetric trade where resource-poor and resource-rich economies display productivity differences but stable income shares due to terms-of-trade dynamics. The model yields two testable predictions that deserve empirical scrutiny: (i) the asymmetric impact, between exporters and importers, of national taxes on resource use on income shares and (ii) the inverse relation between terms-of-trade dynamics and total factor productivity growth. 相似文献
172.
Davide?VioneEmail author Simone?Belmondo Lorenzo?Carnino 《Environmental Chemistry Letters》2004,2(3):135-139
We studied the transformation of phenol in the presence of nitrous acid in the dark. The main detected intermediates were 2-nitrophenol, 4-nitrophenol and 4-nitrosophenol. For the first time a kinetic analysis of the reaction in a pH interval relevant to environmental chemistry has been carried out. The kinetic data are consistent with phenol transformation being initiated by HNO2. The results are relevant to the chemistry of the atmosphere, where HNO2 forms upon heterogeneous conversion of ·NO2, and to water treatment techniques. 相似文献
173.
This paper presents a theoretical model of withdrawing resources based on Odum's energy systems diagrams. According to the theory of a general pulsing principle, withdrawing resources changes in time shifting from the initial phases of growth and maturity to the phases of descent and low energy restoration. A simulation was performed in order to hypothesize potential future trends of withdrawing renewable and non-renewable resources and to show some aspects of their sustainability–unsustainability, respectively. According to Odum's theory, after the rapid growth of the last century, our civilization is living in a climax transition phase and it is now approaching a descent phase. A “way down” will be necessary due to the exhaustion of non-renewable and to the limited use of renewable resources. An integrated “renew–non-renew” model was developed by Odum to show how a “business as usual” trend will bring us to a drastic transition to a world that uses scarce renewable resources. Nevertheless, a different choice is possible, based on Daly's concept of quasi-sustainability that can inspire a new model. The latter argued that the exploitation of a non-renewable resource must be paired with a compensating investment in a renewable substitute. Our model shows that we can use non-renewable resources better to considerably improve our capacity of capturing renewable resources in the future. We present this as a necessary condition to address a sustainable environmental policy. 相似文献
174.
We questioned the different interpretations of ecological sexual segregation from a novel perspective, i.e., by carrying out
diverse temporal and spatial scale analyses within a long-term study (1984–2003). Thus we combined spatial (small/large) and
temporal (small/large) scale analyses to identify the factors generating sexual segregation in fallow deer in San Rossore,
Italy. The study site was divided into an eastern sector characterized by human disturbance (DS) and a western undisturbed
sector (US). According to census data, human presence increased in DS from 1984, and while females gradually abandoned it,
males remained—thus supporting the predation risk hypothesis (large spatial and temporal scale)—and actually increased their
presence in DS, where they seemingly benefited from a lower female density. This supported the indirect competition hypothesis.
The analysis of data on a large temporal and small spatial scale confirmed that intersexual competition, in particular for
grass, was higher in a crowded pasture in US. Observations by means of radio-telemetry of 23 adult females and 25 adult males
(1997–2001, reduced temporal and large spatial scale) showed that large scale segregation was relevant during the day and
disappeared at night, when disturbance was absent and also the females reached DS. This also supported the predation risk
hypothesis. Moreover, sexes showed different habitat choices inside DS at night, thus supporting the forage selection hypothesis
(small spatial and temporal scale). In conclusion, failure to address the whole set of combinations of spatial and temporal
scale analyses would have led to monocausal explanations of ecological sexual segregation. 相似文献
175.
176.
Simone?Ciuti Sara?Davini Siriano?Luccarini Marco?ApollonioEmail author 《Behavioral ecology and sociobiology》2004,56(6):552-564
Large-scale spatial segregation was assessed by means of radio-telemetry in 48 fallow deer studied for 4 years. Three hypotheses have traditionally been used to explain sexual segregation: (1) the predation risk hypothesis, (2) the forage selection hypothesis, (3) the activity budget hypothesis. The first of these seems to be a valid explanation of large-scale segregation in fallow deer at San Rossore, where the use by the two sexes of areas characterized by intense anthropic disturbance, during the day, was compared with other areas not affected by human pressure. Males showed a high use of disturbed areas, both during the day and the night, with the exception of the rutting period, when they reached more remote areas to mate. Females frequented disturbed areas only during the night, with the exception of the birth period, when sexual segregation peaked because females never used these areas, not even during the night. The forage selection hypothesis was invalid on a large scale, considering that no differences between the degree of day and night sexual segregation were to be expected. However, the predation risk hypothesis seems not to be a valid explanation of small-scale sexual segregation, when further subdivisions of disturbed areas are considered, because sexes proved to be segregated also during the night in the area they both used. This emphasizes both the importance of scale in understanding ecological processes, since a combination of many different factors may be responsible for the evolution of sexual segregation in ungulates, and the importance of human pressure in influencing deer behaviour.Communicated by T. Czeschlik 相似文献
177.
Francesco Paladini de Mendoza Simone Bonamano Giuseppe Stella Monica Giovacchini Dario Capizzi Fulvio Fraticelli Sergio Muratore Calogero Burgio Sergio Scanu Maximo A. Peviani Marco Marcelli 《Journal of Coastal Conservation》2016,20(1):13-29
The present work proposes a siting process for the detection of a suitable site for wave energy exploitation. The choice of a suitable site is based on the good agreement between energy availability, environmental sustainability, and equipped facilities to exploit wave energy. The case study in the northern Latium coast is explicative because in this area there are several activities that affect marine ecosystems, and the introduction of renewable energies promote the reduction of anthropic pressures. The nearshore wave power is studied through the numerical wave model (CMS-Wave), and available wave buoys along the coast were used to compare numerical results. In correspondence with Civitavecchia harbour, the largest nearshore wave energy was found; the large depth in front of the breakwater allows to conserve a great part of offshore wave power, with an average dissipation rate of 10 % less than offshore, with mean annual available wave energy of 25.4 MWh/m and seasonal fluctuation of 5.4 MWh/m. This area appears to be an optimal site for nearshore and shoreline wave energy device tests and installations, for energy availability (intermediate level respect Mediterreanean Sea), low potential environmental impact, easier accessibility, and policy oriented towards a larger sustainability of harbour activities. 相似文献
178.
The fundamental data requirements for the authorization of plant protection products and the inclusion of active ingredients in Annex I of Council Directive 91/414/EEC are described in the Annexes II and III of this Directive. Definite instructions with regard to preconditions and for implementation and methodology (guidelines) concerning investigations with terrestrial plants are deficient. In the following, the scientific data requirements are explained for assessing the effects of plant protection products on terrestrial plants. 相似文献
179.
Mirna H. R. Seleghim Simone P. de Lira Patrícia T. Campana Roberto G. S. Berlinck Marcio R. Custódio 《Marine Biology》2007,150(5):967-975
Ascidians are a notable source of nitrogen-bearing secondary metabolites with a wide range of biological activities. Although
many biologically active compounds have been isolated from ascidians, it is often unclear whether the animal or associated
microbial symbionts such as bacteria or fungi are the true biosynthetic source of the metabolites. We have addressed the question
of the biosynthetic source of the alkaloids granulatimide and isogranulatimides by localizing these compounds within the ascidian.
In this work, we demonstrate that granulatimide is stored in Didemnum
granulatum tunic bladder cells. Analysis by confocal fluorescence microscopy at the granulatimide emission range indicated the presence
of fluorescent cells as highly vacuolated cells found dispersed in the ascidian tunic. Since this is the most exposed ascidian
tissue, it is possible that these alkaloids may have a protective role, either as sunscreens and/or as feeding deterrents. 相似文献
180.
Tiago Hennemann Hilario da Silva;Simone Sehnem; 《Sustainable Development》2024,32(5):4633-4648
This study aims to analyze the Industry 4.0 (I4.0) technologies as motivators to circular economy (CE) in the Brazilian foodtech sector via most relevant stakeholders. The study focuses on specific startups in the foodtech sector in the Brazilian context, offering a unique perspective on a relevant niche. It explores how I4.0 technologies are fundamental in the practices adopted by foodtechs, indicating an innovative approach aligned with technological trends. About the methodology, it was carried out through interviews with nine managers of foodtechs. Other sources of data collect have been used, such as reports, presentations, folders, products catalogs, consultations in companies sites, Instagram, Facebook, Linkedin, and videos on the Companies YouTube. The results show that: (i) the I4.0 technologies are fundamental in the practices adopted by the foodtechs; (ii) the CE being internalized, supported by I4.0; (iii) CE is made possible by gathering synergy and co-participation from stakeholders which are strategic and relevant to foodtechs; (iv) innovation factor is present in the adoption of I4.0, in the operationalization of the practices of CE and in the production of synergy among the stakeholders relevant to foodtechs; (v) the creation of new markets is also a consequence of the adoption of I4.0, the adoption of CE and the articulation of stakeholders in the context analyzed; (vi) virtualize and regenerate are the most strengthened strategies at the sphere of the analyzed foodtechs; (vii) IoT, Big Data and integration of ubiquitous and intelligent components in supply chains are the highlighted artifacts in the making of CE practices at foodtechs levels; (viii) foodtechs of food producers have shown a greater synergy and articulation of stakeholders to the success of CE supported by I4.0. The contribution of the study is associated to the legitimation of I4.0 technologies as motivators to the adoption of CE and the engagement of stakeholders to successful circular business models. The study used a qualitative approach and collected data through interviews with nine startups in Brazil. Thematic analysis was employed to analyze the data. The limitations of the study include the small sample size and the focus on startups in one country. Future research should aim to explore the integration of I4.0 and the CE in larger samples, across multiple countries, and involving different types of organizations. Additionally, the study highlights the need for government support for startups in the form of funding, incentives, and regulations, as well as the importance of education and training programs to develop skills related to I4.0 and the CE. Overall, the research objectives are to understand the opportunities and challenges of I4.0 and CE integration in startups and to provide insights for policymakers and practitioners on how to foster sustainable business practices. The specificity of your study in exploring the relationship between the CE and I4.0 technologies in Brazilian foodtechs is a unique contribution. Many studies may focus on broader industries or international contexts, while yours delves into a specific, relevant niche. 相似文献