نتایج جستجو برای: abandoned mines
تعداد نتایج: 16266 فیلتر نتایج به سال:
Acidity of water from abandoned underground mines decreases over time, and the rate of decrease can help formulate remediation approaches and treatment system designs. The objective of this study was to determine an overall acidity decay rate for above-drainage underground mines in northern West Virginia from a large data set of mines that were closed 50 to 70 yr ago. Water quality data were ob...
This paper describes two robotic systems developed for acquiring accurate volumetric maps of underground mines. One system is based on a cart instrumented by laser range finders, pushed through a mine by people. Another is a remotely controlled mobile robot equipped with laser range finders. To build consistent maps of large mines with many cycles, we describe an algorithm for estimating global...
Radon, together with its progeny, is present in high levels in some underground sites. Radon is known to increase the risk of lung cancer, while increased levels of radon decay products on the skin surface have been implicated in skin cancer induction and at sufficient levels might cause deterministic effects such as erythema. Although radon levels in working mines are controlled, radon in aban...
Abstract We conducted one of the first complex geomorphological investigations underground abandoned slate mines in Czechia, Central Europe. Sixty types subterranean geomorphic forms were described from 114 Nízký Jeseník Upland. The forms, evaluated according to their type, scale, frequency, and fragility, are independent each other or embedded. Their cascades occur large multilevel affected by...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید