July 2013
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Monitoring & Testing E-Zine July 2013 |
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| This Month´s Featured Articles, Papers & Reports |
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What to look for when buying a sound level meter
Sound level meters: a matter of class Since sound level meters, or slm`s were invented, they have existed in various grades of accuracy. Today, accuracy is referred to as `Class` and the reason behind all this rests with the microphone. A microphone to measure the top `Precision Grade` has always been very expensive. To give a scale order, a high quality precision measuring microphone has always costed many times the list price of a simple `ordinary` meter. The difference ... | ||
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Research highlights cattle emissions reduction opportunity
Researchers in Denmark have measured the quantities of greenhouse gases in the breath of dairy cows and demonstrated a heritable variability between individual animals. “This means that we have an opportunity to select for breeding those individuals which will produce offspring that generate less methane,” says Dr Jan Lassen who led the research project on individual methane measurements from dairy cows at Aarhus University. BackgroundOver the last 60 years, dairy cattle have been selectively ... | ||
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