Results 61 to 70 of about 6,225 (246)

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

Mapping litter decomposition by remote-detected indicators

Annals of Geophysics, 2006
Leaf litter decomposition is a key process for the functioning of natural ecosystems. An important limiting factor for this process is detritus availability, which we have estimated by remote sensed indices of canopy green biomass (NDVI).
L. Rossi, G. Zurlini, R. Salvatori, M. L. Costantini, S. Mandrone, G. Mancinelli, N. Zaccarelli, L. Sabetta   +7 more
doaj   +1 more source

Failure Probability Assessment using co-Kriging Surrogate Models

Procedia Engineering, 2015
Abstract Industries, among them the aeronautics industry, have to justify the reliability of the structures they design. Static and modal analyzes are the classical methods to validate designs. Nowadays, these are not sufficient anymore, and the damage tolerance approaches, characterizing the severity of a flaw occurring in the designed assembly, are
Lefebvre, J.-P., Dompierre, B., Robert, A., Le Bihan, M., Wyart, E., Sainvitu, C.   +5 more
openaire   +1 more source

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source

Means and covariance functions for geostatistical compositional data: an axiomatic approach [PDF]

, 2017
This work focuses on the characterization of the central tendency of a sample of compositional data. It provides new results about theoretical properties of means and covariance functions for compositional data, with an axiomatic perspective.
A Kolmogorov, D Billheimer, Denis Allard, DJJ Walvoort, G Mateu-Figueras, H Wackernagel, J Aczél, J Aczél, J Aitchison, J Aitchison, J Aitchison, J Matkowski, JD Helterbrand, JJ Egozcue, JJ Egozcue, JL Scealy, JP Chilès, KL Arrow, N Cressie, P Bogaert, R Tolosana-Delgado, RF Shurtz, RY Liu, Thierry Marchant, V Pawlowksy-Glahn, V Pawlowksy-Glahn, WE Miller, WE Sharp, Y Vardi, Y Zuo   +29 more
core   +3 more sources

Dynamic geo‐hydrogeological monitoring‐driven situational awareness for real‐time floor water inrush risk prediction in deep mining

Deep Underground Science and Engineering, EarlyView.
The fused data extracted from the distributed monitoring system as the data basis, combined with dynamic geological data, are imported into a deep learning model. As the geological conditions of mining and excavation change, the risk of water inrush at the working face is retrieved in real time.
Yongjie Li, Huiyong Yin, Fangying Dong, Tao Wu, Chao Zhang   +4 more
wiley   +1 more source

A Multimethod Analysis for Average Annual Precipitation Mapping in the Khorasan Razavi Province (Northeastern Iran)

Atmosphere, 2021
The spatial distribution of precipitation is one of the most important climatic variables used in geographic and environmental studies. However, when there is a lack of full coverage of meteorological stations, precipitation estimations are necessary to ...
Mehdi Aalijahan, Azra Khosravichenar
doaj   +1 more source

A review of new methodological applications for co-kriging in Earth Sciences

Boletín Geológico y Minero, 2011
Cokriging is the multivariate geostatistical estimator that has also been used for estimating spatial factors (factorial cokriging) and for estimating the local distribution function (indicator cokriging). Nevertheless, we show here the flexibility that cokriging offers by reviewing four new applications: (i) downscaling cokriging for image sharpening ...
E. Pardo-Igúzquiza, M. Chica-Olmo, J. P. Rigol-Sánchez, J. A. Luque-Espinar, V. Rodríguez-Galiano   +4 more
openaire   +1 more source

A Detailed Review of Colburn and Friction Factors for Various Types of Fins Used in Compact Plate‐Fin Heat Exchangers

Heat Transfer, EarlyView.
ABSTRACT Compact plate‐fin heat exchangers (PFHEs) are commonly utilized in diverse industries, including aerospace, automotive, processing, and space. Various fin configurations, such as Plain fins, Wavy fins, Lance and Offset fins (OSFs), Perforated fins, louvered fins, and pin fins, are employed in compact heat exchangers (CHEs).
Chennu Ranganayakulu
wiley   +1 more source

Spatiotemporal Evolution of Hydroclimatic Variables in the Brazilian Semi‐Arid Region Through the Aridity Index and Susceptibility to Desertification

International Journal of Climatology, EarlyView.
Over the past 60 years, noticeable changes have been observed in the main hydroclimatological variables, driven by both natural and anthropogenic factors. In the context of climate change, such behaviour may adversely affect the state's economic activities, as well as increase the recurrence of extreme events in the region.
Ronaldo Guilherme Santos Lima, Izaias Rodrigues de Souza Neto, André Quintão de Almeida, Vania Elisabete Schneider, Ludmilson Abritta Mendes   +4 more
wiley   +1 more source