Results 51 to 60 of about 14,263 (225)

Complex circular subsidence structures in tephra deposited on large blocks of ice: Varða tuff cone, Öræfajökull, Iceland [PDF]

, 2016
Several broadly circular structures up to 16 m in diameter, into which higher strata have sagged and locally collapsed, are present in a tephra outcrop on southwest Öræfajökull, southern Iceland.
A Geyer, A Hubbard, A Olszewski, A. J. Walker, AES Forbes, AJ Russell, B Brock, BC McDonald, BF Houghton, BN Whittaker, C Swithinbank, CH Okubo, D. W. McGarvie, E Magnússon, E Zanella, EP Holohan, FS Tweed, H Fay, H Norðdahl, H Tómasson, J Hauff, J Jónsson, J Martí, J. L. Smellie, JA Stevenson, JDL White, JE Cocksedge, JK Maizels, JK Maizels, JS Gilbert, JS Johnson, K Sharma, LO Krenek, MJ Branney, MJ Branney, MJ Branney, MJ Burke, O Roche, O Roche, PD Cole, PD Rowley, PM Marren, R Sulpizio, R. Burgess, RJ Brown, RJ Brown, RJ Carey, RME Thomas, S Burchardt, S Poppe, S Visale, SC Loughlin, TH Druitt, TR Walter, V Acocella, V Acocella, V Manville, V Zanon, WJ Russell, YK Sohn, YK Sohn, YK Sohn   +61 more
core   +2 more sources

Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review

SmartBot, EarlyView.
Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen, Yixin Zhu, Mingxia Bao, Ting Zhang, Jun Wu, Jingbin Hao, Dezheng Hua, Xinhua Liu   +7 more
wiley   +1 more source

Blasting Crater Test Law under Different Resistance Lines Based on DEM-PBM Method

Gaoya wuli xuebao
In open-pit blasting project, the minimum resistance line (W) determines the dominant direction of blasting energy release and the maximum direction of rock velocity.
Defu HE, Kai WANG, Yucheng LI, Zhuo LI, Zhiyu ZHANG, Yonghui HUANG, Yi LUO   +6 more
doaj   +1 more source

Single-Station Seismo-Acoustic Monitoring of Nyiragongo's Lava Lake Activity (D.R. Congo)

Frontiers in Earth Science, 2018
Since its last effusive eruption in 2002, Nyiragongo has been an open-vent volcano characterized by the world's largest persistent lava lake. This lava lake provides a unique opportunity to detect pressure change in the magmatic system by analyzing its ...
Julien Barrière, Nicolas d'Oreye, Nicolas d'Oreye, Adrien Oth, Halldor Geirsson, Niche Mashagiro, Jeffrey B. Johnson, Benoît Smets, Sergey Samsonov, François Kervyn   +9 more
doaj   +1 more source

Validation and refinement of allometric equations for roots of northern hardwoods [PDF]

, 2007
The allometric equations developed by Whittaker et al. (1974. Ecol. Monogr. 44: 233–252), at the Hubbard Brook Experimental Forest have been used to estimate biomass and productivity in northern hardwood forest systems for over three decades.
Hamburg, Steven P., Vadeboncoeur, Matthew A., Yanai, Ruth D.   +2 more
core   +3 more sources

Host preferences of non‐native Acalolepta aesthetica (Coleoptera: Cerambycidae) on the Island of Hawaiʻi

Agricultural and Forest Entomology, EarlyView.
Acalolepta aesthetica is a non‐native cerambycid established on the Island of Hawaiʻi. We show its preferred hosts are woody species that are highly valued for agricultural, horticultural and cultural uses. We used a resource selection function to estimate host preferences and found that kukui (Aleurites moluccanus), the state tree, was preferred ...
Helen R. Sofaer, Blake J. Miles, Jorden A. Zarders, Ellen J. Dunkle, Renee L. Corpuz, Sheina B. Sim, Robert W. Peck   +6 more
wiley   +1 more source

Isotopic composition of oxygen in snow-and-firn thickness on the Eastern peak of Elbrus, the Caucasus

Лëд и снег, 2019
The isotopic composition of oxygen of the snow-and-firn and snow thickness on the Eastern peak of Elbrus had been studied. In 2006-2008, a number of snow samples were taken in the near-peak area of Elbrus to analyze the isotopic composition of them.
Yu. N. Chizhova, V. N. Mikhalenko, Yu. K. Vasil’chuk, N. A. Budantseva, A. V. Kozachek, S. S. Kutuzov, I. I. Lavrentiev   +6 more
doaj   +1 more source

Morphology Scaling of Drop Impact onto a Granular Layer

, 2010
We investigate the impact of a free-falling water drop onto a granular layer. First, we constructed a phase diagram of crater shapes with two control parameters, impact speed and grain size.
Katuragi, Hiroaki, 桂木, 洋光
core   +1 more source

Out in the cold? A review of Early Middle Palaeolithic settlements in northern Central Europe, age data and geological preconditions for site formation and preservation

Boreas, EarlyView.
The characteristics of settlement of Neanderthals in northern Central Europe during the earlier phases of the Middle Palaeolithic (Marine Isotope Stage 8–6) have been a matter of debate for decades, specifically regarding the population dynamics at such latitudes during the coldest phases. In this paper, we review the known archaeological record of the
Gianpiero Di Maida, Jutta Winsemann, Malte Hoffmann, Tobias Lauer, Utz Böhner, Thomas Terberger   +5 more
wiley   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source