The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An in-seam seismic (ISS)-based void detection technique was developed at Penn State University. Among various features, the most important one is its capability of acquiring high quality and broadband signals ranging from 50 to 5000 Hz. This feature is essential for acquiring and analyzing signals for a thin seam condition. The technique was tested at an underground anthracite mine. It successfully...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.