Contamination of successive samples in portable pumping systems

Contamination of Successive Samples in Portable Pumping Systems

Automatic discrete sample pumping systems used to monitor water quality should deliver to storage all materials pumped in a given cycle. If they do not, successive samples will be contaminated, a severe problem with highly variable suspended sediment concentrations in small streams. The crosscontamination characteristics of two small commonly used portable pumping samplers are compared to each ...

Preventing Contamination of Portable Computers.

Evaluation of energy wastage in agricultural pumping systems in shiraz region of iran

Contamination in Denta Sweetclover During Successive Generations of Seed Increase

Contamination levels observed in the breeder, foundation, and certified seed generations of 'Denta' sweetdover (Melilotus alba Desr.) were 0.71, 1.69, and 3.62%, respectively, as measured by the frequency of plants high in content of o-hydroxycinnamic acid. Based on a sample of plants tested simultaneously for o-hydroxycinnamic acid content and ,B-glucosidase activity, a small but consistent de...

Acoustics in Pumping Systems

This tutorial will explain the pumping system speed of sound concept (how to account for acoustic velocity changes due to pipe wall flexibility and liquid properties), the definition of quarter-wave, half-wave, and higher order acoustic mode shapes, the importance of each mode shape, and examples of how to estimate these mode shapes and frequencies. The use of basic acoustics to identify and re...