50,723 research outputs found

    Spontaneous ignition characteristics of gaseous hydrocarbon-air mixtures

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    Experiments are conducted to determine the spontaneous ignition delay times of gaseous propane, kerosine vapor, and n-heptane vapor in mixtures with air, and oxygen-enriched air, at atmospheric pressure. Over a range of equivalence ratios from 0.2 to 0.8 it is found that ignition delay times are sensibly independent of fuel concentration. However, the results indicate a strong dependence of delay times on oxygen concentration. The experimental data for kerosine and propane demonstrate very close agreement with the results obtained previously by Mullins and Lezberg respectively

    Using zebrafish (Danio rerio) to study the behavioral impacts of early bisphenol F exposure reveals decreased swim speed, increased distance between fish, and increased freezing behaviors

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    The widespread use of endocrine disrupting chemicals (EDCs) has been a source of concern because of their various effects on the endocrine system. These effects include metabolic disorders, complications in reproductive health, hormone-related cancers, and neurodevelopmental disorders. Of particular concern is bisphenol A (BPA), a synthetic compound commonly found in consumer products such as water bottles, thermal receipt paper, and epoxy resins used in processed food packaging. Previous studies have shown that BPA can mimic estrogen through a variety of mechanisms and thus elicit an endocrine response. Some manufacturers have responded by removing BPA from their products; however, studies using a replacement compound bisphenol S have reported it to be just as, if not more, dangerous. The use of zebrafish (Danio rerio) larvae as a model organism allows for the effects of bisphenol exposure to be rapidly quantified through a simple behavioral assay. In studies involving bisphenol exposure, the use of zebrafish has demonstrated reproductive, developmental, endocrine, and behavioral effects. The study of bisphenol F, yet another endocrine disruptor that has become a replacement for BPA in consumer products, is highly important to public safety

    Compact monitoring and control console for pressurized gas bottles

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    Compact monitoring and control console dispenses gas over a range of pressures from conventional compressed-gas cylinders. It incorporates in a single assembly the necessary equipment for a portable pressurization system that can be used in welding and other operations requiring a controlled gas supply

    Environmental Policy Since Earth Day I: What Do We Know About the Benefits and Costs?

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    Data on costs and benefits of the major environmental laws passed during the 1970s are reviewed. The winners in terms of benefit-cost analysis include: getting lead out of gasoline, controlling particulate air pollution, reducing the concentration of lead in drinking water, and the cleanup of hazardous waste sites with the lowest cost per cancer case avoided under Superfund. The losers include: mobile source air pollution control, water pollution control, and many of the regulations and cleanup decisions taken under the Federal Insecticide, Fungicide, and Rodenticide Act, the Toxic Substances Control Act, the Safe Drinking Water Act, and Superfund.Environmental Economics and Policy,