Results 81 to 90 of about 82,173 (281)

Garnet–monazite rare earth element relationships in sub-solidus metapelites: a case study from Bhutan [PDF]

, 2018
A key aim of modern metamorphic geochronology is to constrain precise and accurate rates and timescales of tectonic processes. One promising approach in amphibolite and granulite-facies rocks links the geochronological information recorded in zoned ...
Argles, Tom W., Greenwood, Lucy V., Harris, Nigel B. W., Parrish, Randall R., Roberts, Nick M. W., Warren, Clare J.   +5 more
core   +9 more sources

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

The marine ΔR For Nenumbo (Solomon Islands): A case study in calculating reservoir offsets form paired sample data [PDF]

, 2007
It is necessary to calculate location-specific marine ΔR values in order to calibrate marine samples using calibration curves such as those provided through the IntCal98 (Stuiver et al. 1998) data.
Green, Roger, Jones, Martin, Petchey, Fiona, Phelan, Matthew, Sheppard, Peter   +4 more
core   +2 more sources

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

Should we base procurement rules on the competition of linear incentive contracts ? [PDF]

The study of optimal procurement contracts under informational asymmetries generally assumes that the cost disturbance affecting contractor's cost function is not observed by the principal.
François MARECHAL
core  

A review of landscape rehabilitation frameworks in ecosystem engineering for mine closure [PDF]

, 2015
Mining causes changes to the environment and rehabilitation is necessary at mine closure. There is a lack of appropriate frameworks for mine site rehabilitation. In most cases, restoring the mine to previous conditions is challenging.
Drake, J.A., Field, J.B., Greene, R.S.B., Macdonald, B.C.T., Pearson, G.L.   +4 more
core  

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

Anthropogenic Renourishment Feedback on Shorebirds: a Multispecies Bayesian Perspective [PDF]

, 2011
In this paper the realized niche of the Snowy Plover (Charadrius alexandrinus), a primarily resident Florida shorebird, is described as a function of the scenopoetic and bionomic variables at the nest-, landscape-, and regional-scale.
Gregory Kiker, Igor Linkov, Joseph Donoghue, Ma Librada Chu-Agor, Matteo Convertino, Rafael Munoz-Carpena, Richard Fischer   +6 more
core   +1 more source

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

Screening-level assessment of radon, thoron, and gamma radiation exposure in a TENORM-impacted tin mining area, Indonesia

Journal of Degraded and Mining Lands Management
Tin mining activities are frequently associated with Technologically Enhanced Naturally Occurring Radioactive Materials (TENORM), potentially increasing environmental radiation exposure.
Moh Cecep Cepi Hikmat, Tri Edhi Budhi Soesilo, Dadong Iskandar, Soemarno Witoro Soelarno, Muhammad Yusuf, Heri Syaeful   +5 more
doaj   +1 more source