Results 31 to 40 of about 8,628 (232)

Effect of Microorganisms on In Situ Uranium Mining [PDF]

Applied and Environmental Microbiology, 1983
The extraction of some metal values, e.g., uranium or copper, may be accomplished by using solutions to remove metals from ore bodies without practicing conventional mining. This process is referred to as in situ leaching and has been used industrially to recover uranium.
M V, Yates, J A, Brierley, C L, Brierley, S, Follin   +3 more
openaire   +2 more sources

A Survey of the Czechoslovak Follow-up of Lung Cancer Mortality in Uranium Miners [PDF]

, 1993
The major Czechoslovak cohort of uranium miners (S-cohort) is surveyed in terms of diagrams illustrating dependences on calendar year, age, and exposure to radon and radon progeny.
Kunz, E., Kellerer, Albrecht M., Chmelevsky, D., Tomasek, L., Kellerer, A.M., Sevc, J., Placek, V., Barclay, D.   +7 more
core  

3D Response Characteristics Analysis of Vertical Electric Dipole Transient Electromagnetic Fields Under Complex Geological Conditions

Geosciences
Vertical electric sources serve as an effective method for identifying deep hydrocarbon reservoirs. This involves the ability to generate transverse magnetic fields, concentrate currents at reservoir interfaces, and effectively emphasize resistivity ...
Xianxiang Wang, Zefan Hu, Shanmei Li, Qing Sun   +3 more
doaj   +1 more source

A coupled fluid-mechanical interaction model for controlled gas migration mechanism by dilatancy effect in saturated bentonite

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2023
A gas breakthrough in saturated bentonite is relevant to the safety of high-level radioactive waste repositories. The study of gas transport mechanisms in saturated bentonite is very important for the safety assessment of repositories.
Jingna Guo, Qi Zhang, Liang Chen, Shengfei Cao, Jingli Xie, Qiang Li, Zhanqing Chen   +6 more
doaj   +1 more source

Thermal‐induced fracture evolution and acoustic signature of Beishan granite: Insights into tensile strength of barrier system for high‐level radioactive waste disposal

Deep Underground Science and Engineering, EarlyView.
The tensile strength of granite, a proposed host for nuclear waste, degrades severely above 400°C. We link this to specific microcracking patterns captured by acoustic emission, establishing a scientific basis for assessing repository safety under thermal load.
Wei Zeng, Shijie Li, Xiaozhao Li, Zhen Huang, Shangtong Yang, Wentao Xu, Biao Wang, Yun Wu   +7 more
wiley   +1 more source

Advances in Research on Uranium Isotope Fraction in Nature and Prospects

He huaxue yu fangshe huaxue, 2022
Uranium is the heaviest naturally occurring radioactive element in nature, and it is widely distributed in the earth’s crust. With the improvement of the technical accuracy of mass spectrometry to measure uranium isotope ratios, it is gradually ...
SONG Jing, TAN Kai-xuan, LIU Zhen-zhong, LI Chun-guang, LI Yong-mei, WENG Zong-xiang   +5 more
doaj   +1 more source

Explainable hybrid stacking ensemble method for hard rock pillar stability prediction and engineering applications

Deep Underground Science and Engineering, EarlyView.
This research proposes an interpretable hybrid stacking ensemble framework, optimized by the Sparrow Search Algorithm, to enhance hard rock pillar stability prediction. By integrating six machine learning models—k‐nearest neighbors, support vector machines, random forests, Gradient Boosting Decision Tree, eXtreme Gradient Boosting, and Light Gradient ...
Ning Wang, Guoyan Zhao, Meng Wang, Taraka Pattela   +3 more
wiley   +1 more source

Cyclic oxygen vacancy reconstruction in MnO2 polymorphs builds electron reservoirs to drive ionic charge redistribution for stepwise UO22 + reduction

Ecotoxicology and Environmental Safety
Effective uranium (UO22+) recovery from aqueous waste is vital for resource sustainability and environmental safety. Although oxygen vacancies enhance the redox activity of UO22+, their long–term stability and ability to regenerate remain unclear. Herein,
Shuang Zhang, Zixiong Wu, Wenting Zhu, Tao Bo, Yingcai Wang, Hao Jiang, Xiaoyan Li, Yibao Liu, Yuhui Liu   +8 more
doaj   +1 more source

The relationship between cellular protein content and selenium accumulation in freshwater microalgae

Integrated Environmental Assessment and Management, EarlyView.
Abstract Variability in the bioconcentration of selenium (Se) by primary producers at the base of the food web results in uncertainty in predictions of bioaccumulation and ecological risk to higher trophic level organisms. Water chemistry, speciation of Se, and periphyton community composition have all been suggested as factors that contribute to ...
Courtney Bogstie, Melanie Gallant, James R. Elphick, Christopher Kennedy   +3 more
wiley   +1 more source

Efficient 3D Inversion of the Marine Electrical-Source Time Domain Electromagnetic Method Based on the Footprint Technique

Geosciences
Marine electric-source time domain electromagnetic (TDEM) surveys typically involve the simultaneous movement of transmitters and receivers, which generates a large number of transmitter–receiver pairs.
Xianxiang Wang, Shanmei Li, Zefan Hu, Qing Sun   +3 more
doaj   +1 more source