Periglacial and Fluvial Factors Controlling the Sedimentation of Pleistocene Breccia in NW Poland          下载免费PDF全文

Piotr Weckwerth  Małgorzata Pisarska‐Jamroży 《Geografiska Annaler: Series A, Physical Geography》2015,97(2):415-430

Breccias were investigated on the terrace of the Toruń‐Eberswalde ice‐marginal valley at Rozwarzyn (NW Poland). Breccia layers include soft‐sediment clasts with diameters between 2 and 256 mm and soft‐sediment megaclasts with diameters from 256 mm to 7 m. The shape of the soft‐sediment clasts and megaclasts (derived from frozen sediments) in the breccia is diverse: from angular and irregular in the case of debris‐flow breccias to slightly rounded and tabular in fluvial breccias. These two types of breccias were developed during the Late Weichselian when the periglacial climate favored extensive lateral erosion by currents of frozen braided channels in the ice‐marginal valley. The dual presence of breccias of fluvial and debris‐flow origin in channel deposits is unique for Quaternary sediments. Zones of breccias existed in the channels where scours and obstacle marks related to megaclasts developed. The study of breccias shed new light on the fluvial processes in ice‐marginal valleys during the Pleistocene and can be considered as diagnostic for fluvio‐periglacial conditions.  相似文献   

The imprint of plants on ecosystem functioning: A data-driven approach     

《International Journal of Applied Earth Observation and Geoinformation》2015

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(Re-)sources of innovation: Understanding and comparing time-spatial innovation dynamics through the lens of communities of practice     

《Geoforum》2015

Communities of practice play an important role in innovation processes. It is, however, still unclear what their particular function is. In this article the authors seek first to develop further systematic differentiations between different types of knowing in practice to provide the conceptual ground for studying the influences of knowing in practice on innovation in a comparative way. Therefore, existing inductive approaches are complemented with deductive elements that highlight different impulses of reflexivity (push vs. pull) and different internal logics of reflexivity (rationalist vs. aesthetic). Second, in this article the authors introduce a dynamic approach which focuses on core ideas of innovation processes from a spatial perspective. In such a dynamic view types of knowing in practice have an impact as sources and resources of innovation. As sources of innovation they form a particular locus in which novel ideas emerge and subsequently take particular trajectories. As resources of innovation they intervene at subsequent stages of the process and propel further the translation process of a novel idea becoming eventually a valuable and practicable solution.  相似文献   

TeV γ-ray fluxes from the long campaigns on Mrk 421 as constraints on the emission of TeV–PeV neutrinos and UHECRs     

《Astroparticle Physics》2015

Long TeV γ-ray campaigns have been carried out to study the spectrum, variability and duty cycle of the BL Lac object Markarian 421. These campaigns have given some evidence of the presence of protons in the jet: (i) Its spectral energy distribution which shows two main peaks; one at low energies (∼1 keV) and the other at high energies (hundreds of GeV), has been described by using synchrotron proton blazar model. (ii) The study of the variability at GeV γ-rays and X-rays has indicated no significant correlation. (iii) TeV γ-ray detections without activity in X-rays, called “orphan flares” have been observed in this object.Recently, The Telescope Array Collaboration reported the arrival of 72 ultra-high-energy cosmic rays with some of them possibly related to the direction of Markarian 421. The IceCube Collaboration reported the detection of 37 extraterrestrial neutrinos in the TeV–PeV energy range collected during three consecutive years. In particular, no neutrino track events were associated with this source. In this paper, we consider the proton–photon interactions to correlate the TeV γ-ray fluxes reported by long campaigns with the neutrino and ultra-high-energy cosmic ray observations around this blazar. Considering the results reported by The IceCube and Telescope Array Collaborations, we found that only from ∼25% to 70% of TeV fluxes described with a power law function with exponential cutoff can come from the proton–photon interactions.  相似文献   

A coupled modeling study of mechanical and thermodynamical air-ocean interface processes under sea storm conditions     

《Dynamics of Atmospheres and Oceans》2020

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Does the framing of climate policies make a difference to public support? Evidence from UK marginal constituencies     

Matthew Lockwood 《Climate Policy》2013,13(4):1097-1112

Public support for climate policies is essential to underpin their credibility, but evidence suggests that an environmental basis for that support is not strong. It has been suggested that framing climate policies in other terms, such as energy security or job creation, will build a more sustainable political basis for bold climate policies. This approach is explored using data from a survey in 157 UK marginal constituencies. Framing does make a difference to support for the expansion of renewable energy, but not to support for policies on energy efficiency and financial assistance to developing countries. The data also show key differences in levels of support for policies between different socio-demographic and voter groups.  相似文献   

Korea’s approach to overcoming difficulties in adopting the emission trading scheme     

Hyungna Oh  Jin-Oh Kim 《Climate Policy》2013,13(8):947-961

In this study, we aim to describe the background for design characteristics of emissions trading schemes (ETS) in developing and emerging economies, with a particular focus on the case of Korea. These countries may face unique hardships such as fierce opposition from industry sectors, the presence of a power imbalance between the Ministry of Environment (MOE) and ministries that are in charge of supporting output growth, and the absence or incomplete development of financial markets and auctioning mechanisms. To overcome these hardships, the Korean government legislated laws that defined timelines for every stage of ETS development, established a strategic governance architecture to make up the weak position of the MOE, offered strong market-stabilizing measures focused on maintaining the allowance price below a certain level, and provided support packages to make the low-carbon transition easy by compensating for losses caused by the Korea Emissions Trading Scheme (KETS). Such policy instruments that made adoption of KETS easier could be obstacles to making it efficient.

Policy relevance

In the process of adopting a cap-and-trade system, both a developing economy and an emerging economy may face unique hardships, such as strong opposition from industry sectors, the presence of a power imbalance between the Ministry of Environment (MOE) and ministries that are in charge of supporting output growth, and the absence or incomplete development of financial markets and auctioning mechanisms. To make up for the weak base of Korea’s ETS, the government legislated laws that defined timelines for every stage of the ETS development, established a strategic governance architecture to make up for the weak position of the MOE, offered strong market-stabilizing measures focused on maintaining the allowance price below a certain level, and provided support packages to make the low-carbon transition easy by compensating for losses caused by the Korea’s ETS. Korea’s experiences can be shared with other developing economies that are considering adoption of a cap-and-trade scheme.  相似文献   

Astrophysical ZeV acceleration in the relativistic jet from an accreting supermassive blackhole     

《Astroparticle Physics》2014

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Viscous relaxation on comets     

Andrew F. Cheng 《Icarus》2006,184(2):584-588

Three Jupiter family comets have now been observed by spacecraft with the surprising result that these comets lack unambiguous impact craters. Large-scale topography generally appears to be softened on these comets, although sharp topography is preserved at small scales. We find that viscous relaxation of water ice may explain these observations, given reasonable assumptions about ice grain size and temperatures attained in the interiors. We suggest that both the shapes and the cratering records of Jupiter family comets may be substantially modified and no longer reflect cometary formation processes or collisional evolution in the Kuiper Belt.  相似文献   

The fragmentation of condensations of the primordial gas     

D. R. Flower 《Monthly notices of the Royal Astronomical Society》2002,333(4):763-767

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