نتایج جستجو برای: abandoned mines
تعداد نتایج: 16266 فیلتر نتایج به سال:
본 연구에서는 물리적 선별기술을 이용하여 폐금속광산 주변의 중금속으로 오염된 토양 모사체를 처리하고자 하였다. 자력선별을 적용한 경우 5,000gauss 이상의 조건에서 평균적으로 납 53%, 아연 67%, 비소 66%, 카드뮴 71%의 제거율을 보이며 부피를 약 16% 감소시켰다. 코로나 방전형 정전선별 적용 시 공급전압에 따른 살펴본 결과, 납은 –35kV일 때 38%, 아연과 카드뮴의 –30kV일 각각 45%와 48%, 비소는 –25kV 38%로 가장 높았다. 하지만 비용적인 부분과 추후 처리해야 할 오염 토양의 고려할 –10kV 조건이 최적이라 사료된다.
As part of the 65(th) Medical Brigade, U.S. Army, arthropod-borne disease surveillance program and in collaboration with the Korea National Institute of Biological Resources (NIBR), bats were captured from caves and abandoned mines in the Republic of Korea. A total of 39 adult bat flies including five species of Nycteribiidae [Penicillidia jenynsii, Nycteribia parvula, N. formosana, N. allotop...
Environmental databases play an essential role in the management of land and communities, including mapping monitoring environmental hazards over time (i.e., abandoned mines). Over last century, mines have closed for many reasons, but there has been no comprehensive database locations mine sites kept regions world. As such, lost from public knowledge, with way managers to assess risks water con...
Zhang Y., Feng M.M., Yang J.Y., Zhao T.N., Wu H.L., Shi C.Q., Shen Y. (2015): Effects of soil cover and protective measures on reducing runoff and soil loss under artificial rainfall. Soil & Water Res., 10: 198–205. The hazards from wind, sand, and soil erosion caused by human activities, such as residue slopes in abandoned urban mines, have resulted in a vicious circle of environmental degrada...
Distribution, abundance, habitat selection, and activity of bats in Wayne National Forest, Ohio, were studied during the winters and summers of 1979 and 1980. Methods included winter surveys of abandoned mines and mist netting of riparian sites in summer. Four species of bats were found hibernating in 23 of 65 coal mine shafts examined, and big brown bats, Epteskus fuscus, were most abundant. M...
The main aim of this work was to determine the levels multiple natural radionuclides in an aquatic system (Moulouya river, Morocco) impacted by abandoned Zinc and Lead mines. 238U, 234U, 232Th, 230Th 210Po were determined alpha-particle spectrometry water sediment samples collected along river from three pit lakes mines, located Upper Moulouya catchment area. results enabled analysis different ...
Mine tailings from an abandoned metal mine in Korea contained high concentrations of arsenic (As) and heavy metals [e.g., As: 67,336, Fe: 137,180, Cu: 764, Pb: 3,572, and Zn: 12,420 (mg/kg)]. US EPA method 6010 was an effective method for analyzing total arsenic and heavy metals concentrations. Arsenic in the mine tailings showed a high residual fraction of 89% by a sequential extraction. In To...
Sustainable land use in post-mining areas has received more attention only recently. This study examined landscape characteristics and post-mining land use in 51 metal mining sites in Finland. Studied mines were closed during the period of 1924–2016, and over half of them had been active more than 10 years. Mines were typically located in sparsely populated forest landscapes. Cultural and recre...
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