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Biomedical subjects

M J Leahy

Publications and source records attributed to M J Leahy.

7 recordsLinked to original sources
PubMed2003

Emissions modeling of fluidised bed co-combustion of poultry litter and peat.

Gaseous emissions from the fluidised bed co-combustion of 50% w/w chicken litter and peat were monitored and recorded. Emission data were used to create a dispersion model for a proposed site on a poultry farm in Ireland. Variables within the combustion unit influenced both combustion and emission levels of pollutants such as SO(2) and NO(x), CO. Concentrations of atmospheric pollutants decreased with use of the correct ratio between fluidising and secondary air. Dispersion modelling of combustion at a proposed poultry unit predicted that ground level concentrations for the set of emissions data would be below the limits and guidelines set by air quality standards.

Air Pollutants↗
PubMed2003

Monitoring and dispersion modelling of emissions from the fluidised bed combustion of poultry litter.

Gaseous emissions from the fluidised bed combustion of chicken litter were monitored and recorded. Emission data was used to create a dispersion model for a proposed site on a poultry farm in Limerick, Ireland. Variables within the combustion unit not only influenced combustion but also emission levels of pollutants such as SO2 and NOx. CO emissions decreased with use of the correct ratio between fluidising and secondary air, the staging of secondary air and the degree of turbulence with which the secondary air is introduced. Dispersion modelling of actual combustion at a proposed poultry unit predicted that ground level concentrations for the set of emissions data would be below the limits and guidelines set by air quality standards. This was true for both and line source. Line source concentration levels were less than those for point source.

Air Pollutants↗
PubMed2002

Advances in poultry litter disposal technology--a review.

The land disposal of waste from the poultry industry and subsequent environmental implications has stimulated interest into cleaner and more useful disposal options. The review presented here details advances in the three main alternative disposal routes for poultry litter, specifically in the last decade. Results of experimental investigations into the optimisation of composting, anaerobic digestion and direct combustion are summarised. These technologies open up increased opportunities to market the energy and nutrients in poultry litter to agricultural and non-agricultural uses. Common problems experienced by the current technologies are the existence and fate of nitrogen as ammonia, pH and temperature levels, moisture content and the economics of alternative disposal methods. Further advancement of these technologies is currently receiving increased interest, both academically and commercially. However, significant financial incentives are required to attract the agricultural industry.

Abattoirs↗
PubMed1999

Principles and practice of the laser-Doppler perfusion technique.

This paper reviews the development and use of laser-Doppler perfusion monitors and imagers over the past two decades. The enormous interest in microvascular blood perfusion coupled with the 'ease of use' of the technique has led to 1500+ publications citing its use. However, useful results can only be achieved with an understanding of the basic principles of the instrumentation and its application in the various clinical disciplines. The basic theoretical background is explored and definitions of blood perfusion and laser-Doppler perfusion are established. The calibration method is then described together with potential routes to standardisation. A guide to the limitations in application of the technique gives the user a clear indication of what can be achieved in new studies as well as possible inadequacy in some published investigations.

Artifacts↗
PubMed1982

Physician-induced demand: an empirical analysis of the consumer information gap.

The hypothesis of physician-induced demand is examined empirically in a model where variation in consumer information affects health-care utilization. A theoretical framework is posited under which demand-inducing physicians will provide more services, ceteris paribus, to their medically uninformed patients. Using data from the CHAS-NORC National Survey of Access to Medical uninformed patients. Using data from the CHAS-NORC National Survey of Access to Medical Care 1975-1976, physician office visit demand equations are estimated. The key finding is that medical professionals and their families are as likely, if not more likely, to visit physicians as other people, controlling for sociodemographic factors, price factors, access to care factors and perceived health status.

Age Factors↗