Results 51 to 60 of about 1,580,808 (271)

Reservoir theory for studying the geochemical evolution of soils [PDF]

, 2010
Linking mineral weathering rates measured in the laboratory to those measured at the landscape scale is problematic. In laboratory studies, collections of minerals are exposed to the same weathering environment over a fixed amount of time.
Kyungsoo Yoo, Yoo, Kyungsoo, Simon Marius Mudd, Mudd, Simon Marius; id_orcid   +3 more
core   +1 more source

Geology of 243 Ida

, 1996
The surface of 243 Ida is dominated by the effects of impacts. No complex crater morphologies are observed. A complete range of crater degradation states is present, which also reveals optical maturation of the surface (darkening and reddening of ...
R. Sullivan, R. Greeley, R. Pappalardo, E. Asphaug, J. Moore, D. Morrison, M. Belton, M. Carr, C. Chapman, P. Geissler, R. Greenberg, J. Granahan, J. Head, R. Kirk, A. McEwen, P. Lee, P. Thomas, J. Veverka   +17 more
semanticscholar   +1 more source

Resonance‐induced restoration of rock permeability degraded by heavy components of crude oil

Deep Underground Science and Engineering, EarlyView.
Resonance‐induced changes occur in filtration properties of sedimentary rocks in crude paraffin oil flow under acoustic vibrations. Experimental data on (a) pressure drop; (b) permeability; (c) pressure at the rock inlet; and (d) pressure at the rock outlet are presented.
Evgenii Riabokon, Qian Yin, Mikhail Guzev, Mikhail Turbakov, Evgenii Kozhevnikov, Nadezhda Riabokon, Ivan Panteleev   +6 more
wiley   +1 more source

Natural disturbance effects on riparian areas

, 1994
Naturally occurring abiotic disturbances have a tremendous effect on riparian systems. Geomorphic and fluvial disturbances are discussed in this paper. These disturbances help form the complex habitats found in these systems.
Swanson, Fred
core  

Rockburst prediction based on data preprocessing and hyperband‐RNN‐DNN

Deep Underground Science and Engineering, EarlyView.
A data preprocessing workflow is proposed to address challenges in rockburst data analysis. Coupled algorithms preprocess the data set, and hyperband optimization is used to enhance RNN performance. Results show that preprocessing improves accuracy, while dense layers enhance model stability and prediction performance.
Yong Fan, Chenxi Yin, Guangdong Yang, Shengyong Ding, Bin Tian   +4 more
wiley   +1 more source

Failure characteristics and the energy criterion of rock with a through‐going joint under true‐triaxial unloading conditions: Insights from the DEM model

Deep Underground Science and Engineering, EarlyView.
The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu, Changhui Liang, Sijia Liu, Yongjun Zhang, Luo Wang   +4 more
wiley   +1 more source

Numerical investigation on the influence of mesoscopic deformation on contact area and hydraulic aperture to fracture seepage

Deep Underground Science and Engineering, EarlyView.
Fluid flow through a single fracture is commonly described by the cubic law. However, deviations from this model are expected because natural fracture surfaces are rough and in contact with each other in discrete regions. In this study, the interactions between fracture closure, contact area, and hydraulic characterization of mesoscopic‐scale rough ...
Chenghao Han, Yuanlin Bai, Weijie Zhang, Jicheng Zhang, Hongfa Ma, Weiye Li   +5 more
wiley   +1 more source

Why the integration of demographic and site-based studies of disturbance is essential for the conservation of jarrah forest fauna

, 2004
We review recent studies of the impacts of disturbance on the fauna of the jarrah forest, south-western Australia. In particular, we examine five case studies that provide alternative approaches to researching disturbance impacts.
Wardell-Johnson, Grant W., Calver, Matthew, Saunders, D.A., Wardell-Johnson, Grant, Jones, B., Jones, Barbara, Calver, M.C., Saunders, D., Calver, M., Wardell-Johnston, G., Saunders, Denis, Conroy, S., Conroy, Simon   +12 more
core  

Temperature‐dependent shear behavior and constitutive model of the rock–concrete interface

Deep Underground Science and Engineering, EarlyView.
Shear tests were conducted to investigate the temperature‐dependent shear behavior of the rock–concrete interface, highlighting the interaction between the surrounding rock and the lining during tunnel fires. Under experimental conditions, concrete exhibited greater temperature sensitivity than rock, with the shear fracture surface transitioning from ...
Hongbin Chen, Yujing Jiang, Rui Pan, Bin Wang, Sunhao Zhang, Jinge Zhang, Xianzhuang Ma   +6 more
wiley   +1 more source

Landsat Imagery Spectral Trajectories—Important Variables for Spatially Predicting the Risks of Bark Beetle Disturbance

, 2016
Tree mortality caused by bark beetle infestation has significant effects on the ecology and value of both natural and commercial forests. Therefore, prediction of bark beetle infestations is critical in forest management.
Robert Kennedy, Jan Wild, Zdeněk Brož, Josef Brůna, Luděk Berec, Martin Hais, Justin Braaten   +6 more
core   +1 more source