Acta Geotechnica - The post-grouting technique has gradually become an effective approach to improve the bearing capacity of piles in calcareous sand due to its simple process, low cost and... 相似文献
Acta Geotechnica - The shape parameters of sand particles can be determined by either a Krumbein-Sloss chart or mathematical computation based on the particle image. However, these approaches are... 相似文献
To spatially characterize the palaeolakeshore environment at the archaeological kill site Schöningen 13 II-4 of the Middle Pleistocene Reinsdorf sequence, in-depth palynological, geochemical, aquatic microfossil and archaeological analyses were undertaken on sediment sections with an average thickness of about 15 cm, concordantly overlain by faunal remains, dominated by horse, from the unique ‘Spear Horizon’ layers of the 1995 excavation campaign. The data reveal a distinctive lake level drop, documented by the change from a carbonate-rich lake marl to a carbonate-free organic mud with increased carbon content and decreasing C/N, Si/Al, Si/K and Fe/Al ratios, indicating a higher pedogenic supply of organic matter and drier conditions at the site. Compared with older, similar transitional phases of lake level changes occurring within the Reinsdorf sequence, it is important that these youngest sediments are undisturbed, indicating continuous development. Ostracod and diatom analyses indicate a lowering water level with higher salinities and rich aquatic vegetation. Mesorheophilic ostracod species along with tychoplanktic diatom taxa point to flowing waters and turbulence at the lakeshore, presumably related to spring-fed streams originating from nearby highlands. Palynological results reveal a very diverse zonal vegetation pattern around the palaeolakeshore considering an area of investigation of approximately 50 × 75 m and a tessellated type of regional vegetation during the formation of the archaeological horizons. On topographically lower elevated areas, birch groves and taxa favouring wet, marshy conditions such as Cyperaceae, indicative of terrestrialization, were predominating, while other stands of this transitional phase reveal a very dry, grass-dominated steppe woodland favouring a rich wildlife with a striking number of megaherbivores. Our results suggest that the lithological differences of the ‘Spear Horizon’ layers containing the archaeological finds were due to their respective topographical situation and that the layers were deposited almost simultaneously during the beginning of the lake level drop. Human activities seem to have concentrated in sparsely vegetated areas along the palaeolakeshore, rather than in areas of adjacent denser birch swamp forest stands. 相似文献
Dialogues on global climate policy are increasingly discussing the sustainable energy transition, with Goal 7 of the UN’s Sustainable Development Goals highlighting the importance of affordable and clean energy. This study looks at foreign aid as a carrier of global climate policy and examines donor behaviour in the energy sector. By examining donor behaviour when giving energy aid, one can grasp how the donor community helps recipients achieve a sustainable energy transition. A panel of donor–recipient pairs, covering 29 donors and 99 recipients, was constructed for the period between 1996 and 2013, using data from Organisation for Economic Co-operation and Development Creditor Reporting System (OECD CRS), International Energy Agency (IEA) and World Development Indicators (WDI). The pair-year panel data were empirically analysed using a two-part model to test whether energy aid donors respond to recipients’ needs with regard to renewable energy and residential electricity. The findings demonstrate that donors respond to recipients’ sustainable energy needs, both renewable and residential, when selecting recipients. Moreover, donors tend to increase the amount of aid based on renewable energy needs. The findings also highlight the significant role of international climate policy, as donors have changed their energy aid-giving patterns since the start of the Kyoto Protocol. Contrary to the common belief in the aid-giving literature, this study shows that, with regard to energy aid, donor interests are more weakly related to recipient selection than are recipient needs.
Key policy insights
Donors are influenced by the residential energy needs of recipients when giving energy aid, which aligns with the Sustainable Development Goals.
Donors’ energy aid-giving patterns changed between the periods before and after entry into force of the Kyoto Protocol, highlighting the significant role of international climate change policy.
Policy makers and aid practitioners can steer donors to continue to allocate resources to the development of recipients’ energy policy and to help recipients prepare institutional structures to attract private investment in sustainable energy.
Most countries implementing an emissions trading system (ETS), such as EU member states, California in the US, or South Korea, are generally targeting large sized companies, which consume energy above a specific threshold. However, previous studies using computable general equilibrium (CGE) models have analyzed climate policies without considering company size. This may have led to inaccurate results because the impacts of climate policy would differ depending on the coverage of regulated companies. Accordingly, this study examines the environmental and economic impacts of greenhouse gas emission reduction policies, assuming policy results vary by firm size, as covered by the Korean emission trading system. To this end, a CGE model with a separate social accounting matrix based on company size is used to compare three scenarios that reflect different types of carbon pricing methods. The results show that greenhouse gases will be reduced to a lower extent and utility will decrease more if mitigation policies are only imposed to large companies.
Key policy insights
Carbon pricing policies should consider the different impacts on companies of different sizes and industry sectors.
Without considering the different sizes of companies covered by an ETS, the expected carbon price and its economic impact will be underestimated.
Small and medium-sized companies will face more negative impacts than large companies in some industry sectors under an ETS, even if the mitigation burden is only faced by large companies.