Über den Nachweis magneto-optischer Effekte in schwächsten Magnetfeldern     

W. Gerlach  W. Schütz 《Die Naturwissenschaften》1923,11(28):637-638

  相似文献   

Besprechungen     

C. Hermann  O. Kratky  F. Paneth  M. Born  A. Sommerfeld  W. Gerlach  Max Volmer 《Die Naturwissenschaften》1932,20(29):544-550

  相似文献   

    

Walther Gerlach  Julius Schiff  H. Brück  R. Glocker 《Die Naturwissenschaften》1930,18(30):689-692

  相似文献   

    

Strand P  Brown J 《Journal of environmental radioactivity》2007,96(1-3):1-5

  相似文献   

    

Michelle Wcisel  M. Justin O’Riain  Alta de Vos  Wilfred Chivell 《Behavioral ecology and sociobiology》2015,69(1):127-138

  相似文献   

    

Ben Corey  Alan N. Andersen  Sarah Legge  John C. Z. Woinarski  Ian J. Radford  Justin J. Perry 《Conservation Letters》2020,13(1):e12685

Strategies for mitigating climate change through altered land management practices can provide win–win outcomes for the environment and the economy. Emissions trading for greenhouse gas (GHG) abatement in Australia's remote, fire-prone, and sparsely populated tropical savannas provides a financial incentive for intensive fire management that aims to reduce fire frequency, severity, and extent, and it supports important social, economic, and land management opportunities for remote communities, conservation agencies, and pastoralists. These programs now cover >20% of Australia's 1.9 million km² tropical savanna biome, encompassing areas of globally significant biodiversity value. A common assertion is that by reducing the frequency, severity, and extent of fires for GHG abatement, these programs provide biodiversity co-benefits. However, such biodiversity benefits have been assumed rather than demonstrated. Much better accounting of how biodiversity is responding to changed fire management is required to ensure that there are no unintended outcomes for biodiversity (bioperversity), and that biodiversity co-benefits are maximized. Such accounting could underpin the earning of formal biodiversity credits from improved fire management, and will go a long way to understanding and improving the biodiversity outcomes of savanna fire management.  相似文献   

    

Justin J. Podur  David L. Martell  David Stanford 《Environmetrics》2010,21(5):457-469

We use the compound Poisson probability distribution to model the annual area burned by forest fires in the Canadian province of Ontario. Models for sums‐of‐random variables, relevant for modeling aggregate insurance claims and assessing insurance risk are also relevant in modeling aggregate area burned based on sums of sizes of individual fires. Researchers have fit the distribution of fire sizes to the truncated power‐law (or Pareto) distribution (Ward et al., 2001) and a four‐parameter Weibull distribution (Reed and McKelvey, 2002 ). Armstrong ( 1999 ) fitted a lognormal distribution to annual proportion of area burned by forest fires in a region of Alberta. We derive expressions and moments for aggregate area burned in Ontario using fire data from the Ontario Ministry of Natural Resources (OMNR). We derive expressions for the distribution of area burned for “severe” and “mild” fire weather scenarios and for “intensive suppression” and “no suppression” scenarios (represented by the intensive and extensive fire protection zones of the province). These distributions can be used to perform risk analysis of annual area burned. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

    

Arnold Schecter  Justin A. Colacino  Nirav Shah  Olaf Päpke  Mathias Opel  Keyur Patel 《毒物与环境化学》2013,95(6):1053-1063

Levels of polybrominated diphenyl ether (PBDE) flame retardants have been increasing in humans and the environment for the past few decades. Human levels are markedly higher in the US than Europe. Although food appears to be a significant route of intake, food PBDE levels are not substantially higher in the US than Europe. House and office dust appear to be major routes of exposure with air believed to usually provide a lesser route of intake. Because there are very few measurements of airborne PBDE that have been performed in relevant microenvironments in the US, increased efforts to assess airborne PBDE in the US as sources of exposure are needed. This study reports, for the first time from a Southwestern US city in Texas, the results of measurements of airborne PBDE in multiple locations, two outdoor and six indoor (residential and office) from active air sampling with collection of a combination of both vapor- and particulate-phase PBDE. Higher PBDE levels were measured in indoor than outdoor air, which confirms previous findings. Of 11 measured congeners including BDE 209, total PBDE levels in two outdoor air samples were 112 and 125 pg m^?3 and the indoor air levels ranged from 175 to 1232 pg m^?3 with a median of 572 pg m^?3. These findings suggest that sources of air contamination with PBDE may be similar in Texas as elsewhere in North America. However, more sampling is required to (1) better determine if this is the case and (2) attempt to characterize potential sources of PBDE contamination in both indoor and outdoor air by analysis of congener patterns.  相似文献   

    

Justin Leinaweaver  Robert Thomson 《环境政策》2016,25(4):633-660

Why do some governments have more environmentally friendly policies than others? Part of the answer involves governing parties’ ideological positions on environmentalism and the constraints imposed by executive institutions. Here, this party-based explanation is elaborated and tested with uniquely comparable indicators of national environmental policies for governments in 27 countries in the European Union (EU). The findings show that governments with parties that emphasized environmental protection in their manifestos are more likely to propose pro-environment policies during EU-level negotiations. However, the effect of ideology is mediated by the centralization of the national executive branch. In centralized national executives, the environmental positions of prime ministers’ parties affect policies, while in decentralized national executives, the positions of environment ministers’ parties are relevant. The findings have implications for understanding the impact of parties’ environmental positions on government policies, as well as for policy making in coalitions more generally.  相似文献   

Special issue on eco-informatics: Modeling biological conservation decisions     

Justin C. Williams  Charles S. ReVelle  Simon A. Levin 《Environmental Modeling and Assessment》2005,10(3):161-162

  相似文献