Results 11 to 20 of about 1,991 (161)

Correlations Between Subduction of Linear Oceanic Features and Arc Volcanism Volume Around the Pacific Basin

open access: yesGeochemistry, Geophysics, Geosystems, Volume 23, Issue 12, December 2022., 2022
Abstract Arc volcanoes, created by magma generated from the dehydration of subducting slabs, show great variability in their sizes and along‐arc spatial distributions. In this study, we address a fundamental question, namely, how do subduction zones and volcanic arcs respond to the subduction of “atypical” oceanic lithosphere.
Claudia Adam   +3 more
wiley   +1 more source

Vitamin E and carotenoid profiles in leaves, stems, petioles and flowers of stinging nettle (Urtica leptophylla Kunth) from Costa Rica

open access: yesJournal of the Science of Food and Agriculture, Volume 102, Issue 14, Page 6340-6348, November 2022., 2022
Abstract BACKGROUND Local leafy vegetables are gaining attention as affordable sources of micronutrients, including vitamins, pro‐vitamin carotenoids and other bioactive compounds. Stinging nettles (Urtica spp.) are used as source of fibers, herbal medicine and food.
Alexander Montoya‐Arroyo   +6 more
wiley   +1 more source

Reactivation of Magma Pathways: Insights From Field Observations, Geochronology, Geomechanical Tests, and Numerical Models

open access: yesJournal of Geophysical Research: Solid Earth, Volume 126, Issue 5, May 2021., 2021
Abstract Field observations and unmanned aerial vehicle surveys from Caldera Taburiente (La Palma, Canary Islands, Spain) show that pre‐existing dykes can capture and re‐direct younger ones to form multiple dyke composites. Chill margins suggest that the older dykes were solidified and cooled when this occurred.
Samuel T. Thiele   +4 more
wiley   +1 more source

Study on the Effect of Amygdales on Mechanical Characteristics of Basalt Using the Combined Finite‐Discrete Element Method

open access: yesAdvances in Materials Science and Engineering, Volume 2021, Issue 1, 2021., 2021
Amygdaloidal basalt, as a heterogeneous rock, is widely exposed at Baihetan hydropower station, China. The geometric effect of amygdales needs further studies and quantifying the shape, orientation, and statistical distribution of amygdales plays an important role in the laboratory and numerical experiments.
Shirui Zhang   +5 more
wiley   +1 more source

Comparative Study on Mineral‐Scale Microcrack Propagation of Shale under Different Loading Methods

open access: yesAdvances in Civil Engineering, Volume 2021, Issue 1, 2021., 2021
Producing a sufficient volume of multiscale crack networks is key to enhancing recovery of shale gas. The formation of crack network largely depends on initiation and propagation of microcracks. To reveal the influence of different loading methods on the propagation of mineral‐scale microcracks, this study used the Voronoi tessellation technique to ...
Jianyong Zhang   +5 more
wiley   +1 more source

A New Genus and Two New Species of Unarmed Hymenolepidid Cestodes (Cestoda: Hymenolepididae) from Geomyid Rodents in Mexico and Costa Rica [PDF]

open access: yes, 2020
Two new cestodes of the family Hymenolepididae are described from two species of rodents of the family Geomyidae collected in Mexico and Costa Rica. One new species of Hymenolepis is described from Cratogeomys planiceps Merriam 1895 from near Toluca ...
Campbell, Mariel   +3 more
core   +3 more sources

Volcanic CO2 output at the Central American subduction zone inferred from melt inclusions in olivine crystals from mafic tephras [PDF]

open access: yes, 2011
The volatile contents of olivine‐hosted (Fo89–71) melt inclusion glasses in rapidly quenched mafic tephras from volcanic front volcanoes of the Central American Volcanic Arc (CAVA) in Guatemala, Nicaragua, and Costa Rica, were analyzed by secondary ion
Auger   +61 more
core   +1 more source

Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage

open access: yesShock and Vibration, Volume 2020, Issue 1, 2020., 2020
Using a self‐designed hydraulic impact drilling test‐bed and rock core drill, six groups of cylindrical granite specimens (93 mm dia. × 200 mm) containing central axial holes formed either by impact or nonimpact drilling methods were tested in uniaxial compression to failure on an Instron 1346 universal testing machine to investigate their mechanics ...
Zhi Liu   +5 more
wiley   +1 more source

Chronic Intake of Commercial Sweeteners Induces Changes in Feeding Behavior and Signaling Pathways Related to the Control of Appetite in BALB/c Mice

open access: yesBioMed Research International, Volume 2018, Issue 1, 2018., 2018
Nonnutritive sweetener use is a common practice worldwide. Although considered safe for human consumption, accumulating evidence suggests these compounds may affect metabolic homeostasis; however, there is no consensus on the role of frequent sweetener intake in appetite and weight loss.
Alberto A. Barrios-Correa   +6 more
wiley   +1 more source

MODELING OF THE UNCONFINED COMPRESSIVE STRENGTH TEST OF LIGNITE FROM PESTEANA OPENPIT MINE USING THE COMBINED FINITE-DISCRETE ELEMENT METHOD – FDEM [PDF]

open access: yesFiabilitate şi Durabilitate, 2023
The property of rocks to oppose and keep their shape almost unchanged under the action of load is called strength. Compressive strength is defined as the maximum stress a material can withstand until its failure. Besides the physical characteristics of
Alexandru Robert CIOCLU   +2 more
doaj  

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