Results 21 to 30 of about 1,175 (180)

The origin of tubular lava stalactites and other related forms [PDF]

International Journal of Speleology, 1998
Tubular lava stalactites are often found in lava tubes. Field observations, sample analysis, and comparative studies indicate that these are segregations extruded during cooling from partially crystallized lava al about 1,070 - 1,000 °C.
Kevin Allred, Carlene Allred
doaj  

Mechanisms of formation of lava tubes [PDF]

Journal of Geophysical Research: Solid Earth, 2008
We propose a model to describe lava tube formation, considering lava as a Newtonian fluid moving downslope in a rectangular channel. We obtain flow velocity using an analytical steady‐state solution of the Navier‐Stokes equation. Shear stress is also calculated from velocity for a Newtonian incompressible and isotropic fluid. A 2‐D model with heat flux
A. Valerio, A. Tallarico, DRAGONI, MICHELE   +2 more
openaire   +3 more sources

Replacement of Ores Recorded by Textures and Chemical Compositions of Sphalerite: An Example From the Furutobe Kuroko Deposit, Akita, Japan

Geological Journal, EarlyView.
Coupled dissolution‐reprecipitation of early formed Cd‐, Fe‐, Ag‐ and Sb‐poor sphalerite through interaction with high‐temperature and high‐sulphur fugacity Cu‐rich fluids, responsible for the formation of the yellow ores, resulted in the formation of Cd‐, Fe‐, Ag‐ and Sb‐rich, heavily chalcopyrite‐diseased sphalerite and enrichment of critical metals ...
Manuel Nopeia, Ryohei Takahashi, Andrea Agangi, Pearlyn Manalo, Hinako Sato   +4 more
wiley   +1 more source

Population dynamics of Townsend's big‐eared bats: effect of age and drought on survival

The Journal of Wildlife Management, EarlyView.
We estimated age‐specific yearly survival of female Townsend's big‐eared bats in Inyo and Mono Counties, California. We found that both juvenile and adult survival were negatively impacted by drought, and that detection probability was lower for hand‐recapture than for bats detected via pass‐through antenna arrays.
Natalie M. Hamilton, Rebekah E. Ruzicka, Jessica E. Light, Michael L. Morrison   +3 more
wiley   +1 more source

Lave caves of Kilimanjaro. Mawenzi lava tubes [PDF]

International Journal of Speleology, 1998
This is the first short report on the exploration of lava tubes in the upper part of Kilimanjaro. The area seems to be extremely interesting from vulcanospeleological point of view.
Clive Ward
doaj  

Survey on AI‐Enabled Computer Vision Technologies and Applications for Space Robotic Missions

Journal of Field Robotics, EarlyView.
ABSTRACT This survey provides a comprehensive overview of recent advancements and challenges in Artificial Intelligence (AI)‐enabled computer vision (CV) techniques for space robotic missions, spanning critical phases such as Entry, Descent, and Landing (EDL), orbital operations, and planetary surface exploration.
Maciej Quoos, Steven Kay, Julia Wajoras, Robert Field, Evridiki V. Ntagiou, Fakher Mohammad, Yang Gao   +6 more
wiley   +1 more source

A comprehensive review of lunar lava tube base construction and field research on a potential Earth test site

International Journal of Mining Science and Technology
The Moon, as the closest celestial body to the Earth, plays a pivotal role in the progression of deep space exploration, and the establishment of research outposts on its surface represents a crucial step in this mission.
Yujie Feng, Peng-Zhi Pan, Xuhai Tang, Zhaofeng Wang, Yuxin Li, Altaf Hussain   +5 more
doaj   +1 more source

Lava caves of the Republic of Mauritius, Indian Ocean [PDF]

International Journal of Speleology, 1998
In their Underground Atlas, MIDDLETON & WALTHAM (1986) dismissed Mauritius as: “very old volcanic islands with no speleological interest”. Recent investigations indicate this judgement is inaccurate; there are over 50 significant caves, including lava ...
Gregory J. Middleton
doaj  

Cry me a Pele’s tear: new insights on the internal structures of Pele’s tears

Frontiers in Earth Science, 2023
In this paper we present novel observations of internal structures of Pele’s tears and spheres revealed from SEM studies of particles formed within Kilauean lava fountains.
Scott Moyer, Dork Sahagian
doaj   +1 more source

Determination of eruption temperature of Io's lavas using lava tube skylights [PDF]

Icarus, 2016
Determining the eruption temperature of Io's dominant silicate lavas would constrain Io's present interior state and composition. We have examined how eruption temperature can be estimated at lava tube skylights through synthesis of thermal emission from the incandescent lava flowing within the lava tube.
Ashley Gerard Davies, Laszlo P. Keszthelyi, Alfred S. McEwen   +2 more
openaire   +1 more source