This paper reports how three field sampling methods performed in different rooms and on different surface types and how they compare using two different metrics of concentration (μg/g) and loading (μg ...

Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

The World Wide Web contains a vast corpus of consumer-generated content that holds invaluable insights for improving the product and service offerings of firms. Yet the typical method for extracting ...

The United Kingdom and the United States share many similarities but are distinctly different in the way each nation structures and enforces their respective health and safety legislation, monitoring ...

This is a preview. Log in through your library . Abstract Sampling the density and basal area of trees is fundamental to quantitatively characterizing forests and woodlands. Commonly used sampling ...

One of the major types of materials analyzed using optical spectroscopy is thin films. Unlike some thin films that are self-supporting, ultra thin films are deposited on a substrate. These ultra thin ...