منابع مشابه
A non-parametric framework for estimating threshold limit values
BACKGROUND To estimate a threshold limit value for a compound known to have harmful health effects, an 'elbow' threshold model is usually applied. We are interested on non-parametric flexible alternatives. METHODS We describe how a step function model fitted by isotonic regression can be used to estimate threshold limit values. This method returns a set of candidate locations, and we discuss ...
متن کاملThe role of threshold limit values in U.S. air pollution policy.
This paper analyzes the role of threshold limit values (TLVs) in national air pollution policy during the 1980s, a period in which the Environmental Protection Agency (EPA) sought to delegate to individual states the authority to evaluate and regulate airborne toxic substances. We focus on 20 carcinogens and 11 substances with non-genotoxic health effects that were regulated by local air toxics...
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This paper considers a condition-based predictive maintenance model for degrading systems under continuous monitoring by multiple sensors. Sensors’ observations of the degradation criterion are utilized to obtain the optimum threshold degradation level that achieves maximum reliability estimates of the system taking into consideration sensors’ errors. The effect of the number of sensors on the ...
متن کاملAre we closer to developing threshold limit values for allergens in the workplace?
Objective: To define threshold limit values and legally binding occupational exposure limits. Data Sources: Review of suitable literature. Study Selection: Studies based on detailed descriptions and/or measurements of airborne allergenic dust, total allergens, or even key allergens were selected. Results: Prevalences of IgE-mediated sensitization and occupational asthma are related to the aeroa...
متن کاملAre we closer to developing threshold limit values for allergens in the workplace?
The use of immunoassays has facilitated the measurement of high molecular weight sensitizers, usually protein molecules, in the picogram and nanogram per cubic meter range. This facilitated the evaluation of exposure response relationships for bakery workers, exposed to wheat allergens and fungal alpha-amylase and other groups exposed to other allergens such as laboratory animal workers. The ap...
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ژورنال
عنوان ژورنال: Sangyo Igaku
سال: 1972
ISSN: 0047-1879,1881-1302
DOI: 10.1539/joh1959.14.572