منابع مشابه
Rock dusting considerations in underground coal mines
Rock dusting to prevent coal dust explosions has been in widespread use in U.S. underground coal mines since the early 1900s. Underground coal mining technology has changed significantly over this same time period, becoming highly mechanized and produces finer coal dust particles which are more explosive. Despite the advances in mining technology, mine-wide dust sampling practices have remained...
متن کاملNo-Fault Insurance at 40: Dusting Off an Old Idea to Help Consumers Save Money in an Age of Austerity
This year marks the 40th anniversary of the first state (Massachusetts) to implement a no-fault law. Between 1971 and 1975, the District of Columbia and 15 states followed suit. During the 1970s, the U.S. Congress also considered, but failed to adopt, a national no-fault law. Since 1975, however, no state has adopted a no-fault law, due in substantial part to the opposition of the trial bar and...
متن کاملAbsorption of hexachlorophane from dusting powder on newborn infant's skin.
In a maternity hospital in which the umbilicus and trunk of healthy newborn infants were treated with 0.33% hexachlorophane dusting powder, the hexachlorophane content of blood was measured in mothers before delivery, in infants' umbilical samples at birth, and at 8 days of age in capillary blood samples. One mother and her baby had rather high blood concentrations of hexachlorophane, probably ...
متن کاملSample size calculations: should the emperor's clothes be off the peg or made to measure?
Conventional wisdom dictates that it is unethical to conduct a study that is so large that excess numbers of patients are exposed or so small that clinically important changes cannot be detected. This implies that there is some optimal sample size that can be calculated using statistical theory and information from previous research. But the choice of sample size is usually a compromise between...
متن کاملManipulation of the calcium content of insectivore diets through supplementary dusting
Insects fed to captive insectivores are deficient in calcium with inverse calcium to phosphorous ratios (Ca:P), and supplementation is required to avoid nutritional metabolic bone disease (NMBD). One method of improving the nutritional value of feeder insects is by “dusting” with powdered supplements, although it is often suggested that these are rapidly shed from prey insects. Here we analysed...
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ژورنال
عنوان ژورنال: Nature
سال: 1994
ISSN: 0028-0836,1476-4687
DOI: 10.1038/372225a0