The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform

Gilles Thériault - One of the best experts on this subject based on the ideXlab platform.

  • Risks of leukaemia among residents close to high voltage transmission Electric Lines.
    Occupational and environmental medicine, 1997
    Co-Authors: Gilles Thériault
    Abstract:

    OBJECTIVES: To reassess the risk of leukaemia associated with residential exposure near high voltage transmission Electric Lines of 49 kV and above in view of the recent publications. METHODS: Through a review of papers considering the risk of leukaemia among people living near high voltage transmission Lines, the combined risks of leukaemia were calculated for distances or = 2 mG of 1.3, 95% confidence interval (95%CI) 1.0 to 1.7. The ORs increased with exposures at 3 mG, 4 mG, and 10 mG. The risks were also increased for distances of 50 and 25 m from the Lines. CONCLUSIONS: This meta-analysis tends to confirm the presence of an association between exposure to magnetic fields and leukaemia among people who reside in the vicinity of high voltage transmission Electric Lines of > or = 49 kV. There is consistency across studies. Measures of exposure used in the studies were either distance from the Lines or calculated fields estimated from pertinent line features. The results apply to adults as well as to children.

  • Risks ofleukaemia among residents close tohigh voltage transmission Electric Lines
    1997
    Co-Authors: Gilles Thériault
    Abstract:

    Objectives-To reassess theriskofleukaemiaassociated withresidential exposure nearhighvoltage transmission Electric Linesof49kV andaboveinviewofthe recent publications. Methods-Through a reviewofpapers considering theriskofleukaemia among peopleliving nearhighvoltage transmissionLines, thecombinedrisks ofleukaemiawerecalculated fordistances S 50m and< 25m andforexposures at2mG,3 mG,4mG,and10mG. Results-The combinedanalysis ofthe contributive studies indicated anestimate ofrisk(odds ratio (OR))forexposure ¢ 2 mG of 1.3,95% confidence interval (95%CI)1.0to1.7.TheORs increased withexposures at3mG,4mG,and10mG. Therisks werealsoincreased fordistances of50and25m fromtheLines. Conclusions-This meta-analysis tendsto confirmthepresenceofan association betweenexposure tomagnetic fields and leukaemia amongpeople whoreside inthe vicinity ofhighvoltage transmission ElectricLines of 49kV.Thereisconsistency acrossstudies. Measuresofexposure used inthestudies wereeither distance from theLinesorcalculated fields estimated frompertinent linefeatures. Theresults apply toadults aswellastochildren. (Occup Environ Med1997;54:625-628)

Carlo Rovelli - One of the best experts on this subject based on the ideXlab platform.

  • generalized Lines of force as the gauge invariant degrees of freedom for general relativity and yang mills theory
    Physical Review Letters, 1992
    Co-Authors: Ezra T. Newman, Carlo Rovelli
    Abstract:

    We present a set of equations that determine (with certain qualifications) what is (i) a complete canonical set of gauge-invariant variables for Yang-Mills (YM) theory that generalize Faraday's Electric Lines of force and (ii) a complete canonical set of the diffeomorphism- and gauge-invariant observables for general relativity (GR). Both results come from solving the Hamilton-Jacobi version of the constraint equations: the Gauss law constraints of YM theory and the Gauss law and diffeomorphism constraint of GR in the Ashtekar formalism

  • Generalized Lines of force as the gauge invariant degrees of freedom for general relativity and Yang-Mills theory
    Physical review letters, 1992
    Co-Authors: Ezra T. Newman, Carlo Rovelli
    Abstract:

    We present a set of equations that determine (with certain qualifications) what is (i) a complete canonical set of gauge-invariant variables for Yang-Mills (YM) theory that generalize Faraday's Electric Lines of force and (ii) a complete canonical set of the diffeomorphism and gauge invariant observables for general relativity (GR). Both results come from solving the Hamilton-Jacobi version of the constraint equations: the Gauss law constraints of YM theory and the Gauss law and diffeomorphism constraint of GR in the Ashtekar formalism. These results are local in physical space as well as in phase space.

Ezra T. Newman - One of the best experts on this subject based on the ideXlab platform.

  • generalized Lines of force as the gauge invariant degrees of freedom for general relativity and yang mills theory
    Physical Review Letters, 1992
    Co-Authors: Ezra T. Newman, Carlo Rovelli
    Abstract:

    We present a set of equations that determine (with certain qualifications) what is (i) a complete canonical set of gauge-invariant variables for Yang-Mills (YM) theory that generalize Faraday's Electric Lines of force and (ii) a complete canonical set of the diffeomorphism- and gauge-invariant observables for general relativity (GR). Both results come from solving the Hamilton-Jacobi version of the constraint equations: the Gauss law constraints of YM theory and the Gauss law and diffeomorphism constraint of GR in the Ashtekar formalism

  • Generalized Lines of force as the gauge invariant degrees of freedom for general relativity and Yang-Mills theory
    Physical review letters, 1992
    Co-Authors: Ezra T. Newman, Carlo Rovelli
    Abstract:

    We present a set of equations that determine (with certain qualifications) what is (i) a complete canonical set of gauge-invariant variables for Yang-Mills (YM) theory that generalize Faraday's Electric Lines of force and (ii) a complete canonical set of the diffeomorphism and gauge invariant observables for general relativity (GR). Both results come from solving the Hamilton-Jacobi version of the constraint equations: the Gauss law constraints of YM theory and the Gauss law and diffeomorphism constraint of GR in the Ashtekar formalism. These results are local in physical space as well as in phase space.

Diego Sustaita - One of the best experts on this subject based on the ideXlab platform.

  • Nest-building behavior of Monk Parakeets and insights into potential mechanisms for reducing damage to utility poles.
    PeerJ, 2014
    Co-Authors: Kevin R. Burgio, Margaret A. Rubega, Diego Sustaita
    Abstract:

    The Monk Parakeet (Myiopsitta monachus) commonly uses utility poles as a substrate for building large, bulky nests. These nests often cause fires and Electric power outages, creating public safety risks and increasing liability and maintenance costs for Electric companies. Previous research has focused on lethal methods and chemical contraception to prevent nesting on utility poles and Electrical substations. However, implementation of lethal methods has led to public protests and lawsuits, while chemical contraception may affect other than the targeted species, and must be continually reapplied for effectiveness. One non-lethal alternative, nest removal, is costly and may not be a sustainable measure if Monk Parakeet populations continue to grow. In order to identify cost-effective non-lethal solutions to problems caused by Monk Parakeet nesting, we studied their behavior as they built nests on utility poles. Monk Parakeets initiate nests by attaching sticks at the intersection of the pole and Electric Lines. We found that parakeets use the Electric Lines exclusively to gain access to the intersection of Lines and pole during nest initiation, and continue to use the Lines intensively throughout construction. Monk Parakeets also have more difficulty attaching sticks during the early stages of nest construction than when the nest is nearing completion. These findings suggest that intervention during the earlier stages of nest building, by excluding Monk Parakeets from Electric Lines adjacent to poles, may be an effective, non-lethal method of reducing or eliminating parakeets nesting on, and damaging, utility poles.

Kevin R. Burgio - One of the best experts on this subject based on the ideXlab platform.

  • Nest-building behavior of Monk Parakeets and insights into potential mechanisms for reducing damage to utility poles.
    PeerJ, 2014
    Co-Authors: Kevin R. Burgio, Margaret A. Rubega, Diego Sustaita
    Abstract:

    The Monk Parakeet (Myiopsitta monachus) commonly uses utility poles as a substrate for building large, bulky nests. These nests often cause fires and Electric power outages, creating public safety risks and increasing liability and maintenance costs for Electric companies. Previous research has focused on lethal methods and chemical contraception to prevent nesting on utility poles and Electrical substations. However, implementation of lethal methods has led to public protests and lawsuits, while chemical contraception may affect other than the targeted species, and must be continually reapplied for effectiveness. One non-lethal alternative, nest removal, is costly and may not be a sustainable measure if Monk Parakeet populations continue to grow. In order to identify cost-effective non-lethal solutions to problems caused by Monk Parakeet nesting, we studied their behavior as they built nests on utility poles. Monk Parakeets initiate nests by attaching sticks at the intersection of the pole and Electric Lines. We found that parakeets use the Electric Lines exclusively to gain access to the intersection of Lines and pole during nest initiation, and continue to use the Lines intensively throughout construction. Monk Parakeets also have more difficulty attaching sticks during the early stages of nest construction than when the nest is nearing completion. These findings suggest that intervention during the earlier stages of nest building, by excluding Monk Parakeets from Electric Lines adjacent to poles, may be an effective, non-lethal method of reducing or eliminating parakeets nesting on, and damaging, utility poles.