34 research outputs found

    Lehetőségek és kockázatok a feljövőben levő gazdaságokban

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    Interview of Gillian Tett Additional Materials Fool\u27s Gold hb preface

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    CO2 Enhancement of Forest Productivity Constrained by Limited Nitrogen Availability

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    Stimulation of terrestrial productivity by rising CO~2~ concentration is projected to reduce the airborne fraction of anthropogenic CO~2~ emissions; coupled climate-carbon (C) cycle models, including those used in the IPCC Fourth Assessment Report (AR4), are sensitive to this negative feedback on atmospheric CO~2~^1^. The representation of the so-called CO~2~ fertilization effect in the 11 models used in AR4 and subsequent models^2,3^ was broadly consistent with experimental evidence from four free-air CO~2~ enrichment (FACE) experiments, which indicated that net primary productivity (NPP) of forests was increased by 23 +/- 2% in response to atmospheric CO~2~ enrichment to 550 ppm^4^. Substantial uncertainty remains, however, because of the expectation that feedbacks through the nitrogen (N) cycle will reduce the CO~2~ stimulation of NPP^5,6^; these feedbacks were not included in the AR4 models and heretofore have not been confirmed by experiments in forests^7^. Here, we provide new evidence from a FACE experiment in a deciduous Liquidambar styraciflua (sweetgum) forest stand in Tennessee, USA, that N limitation has significantly reduced the stimulation of NPP by elevated atmospheric CO~2~ concentration (eCO~2~). Isotopic evidence and N budget analysis support the premise that N availability in this forest ecosystem has been declining over time, and declining faster in eCO~2~. Model analyses and evidence from leaf- and stand-level observations provide mechanistic evidence that declining N availability constrained the tree response to eCO2. These results provide a strong rationale and process understanding for incorporating N limitation and N feedback effects in ecosystem and global models used in climate change assessments

    A Novel Anti-Influenza Copper Oxide Containing Respiratory Face Mask

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    Protective respiratory face masks protect the nose and mouth of the wearer from vapor drops carrying viruses or other infectious pathogens. However, incorrect use and disposal may actually increase the risk of pathogen transmission, rather than reduce it, especially when masks are used by non-professionals such as the lay public. Copper oxide displays potent antiviral properties. A platform technology has been developed that permanently introduces copper oxide into polymeric materials, conferring them with potent biocidal properties.. The copper oxide containing masks successfully passed Bacterial Filtration Efficacy, Differential Pressure, Latex Particle Challenge, and Resistance to Penetration by Synthetic Blood tests designed to test the filtration properties of face masks in accordance with the European EN 14683:2005 and NIOSH N95 standards.Impregnation of copper oxide into respiratory protective face masks endows them with potent anti-influenza biocidal properties without altering their physical barrier properties. The use of biocidal masks may significantly reduce the risk of hand or environmental contamination, and thereby subsequent infection, due to improper handling and disposal of the masks

    A cold peace: America, Japan, Germany, and the struggle for supremacy

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    As political and economic forces push the three superpowers--the United States, Germany and Japan--further apart, the Cold War could give way to a very "cold peace." That is the prognosis of Garten, who held senior White House and State Department posts under Nixon, Ford and Carter and is now an investment banker, in an important, clear-eyed book for anyone struggling to come to grips with the changing world order. Drawing on his broad experience, he argues that many disputes among the "Big Three" are rooted in the different kinds of capitalism the three countries practice. Relations among the Big Three, he predicts, may deteriorate through squabbles over regional trade blocs, aid to the former Soviet Union and the role of the U.N. and the World Bank. Garten paints a sobering picture of the "German Empire" 's dominant role within the European Community and of Japan's tightening rein over its East Asian superbloc. Calling for collective Big Three leadership to solve mutual problems, he predicts that America in the '90s will measure itself against what Japan and Germany are becoming
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