Results 31 to 40 of about 168,341 (157)

Mercury cycling during the last glacial period in Arctic Lake El'gygytgyn, NE Russia

Journal of Quaternary Science, EarlyView.
ABSTRACT Tectonic processes play a key role in the global mercury (Hg) cycle on geological timescales, by mobilising Hg from deep Earth reservoirs to the surface. These natural fluxes also introduce a dynamic component to the terrestrial Hg cycle that can interact with other environmental signals and influence Hg delivery to sedimentary records.
Alice R. Paine, Joost Frieling, Bernd Wagner, Martin Melles, Volker Wennrich, Tamsin A. Mather, Stuart A. Robinson, David M. Pyle   +7 more
wiley   +1 more source

High-Speed Rotary Percussion Drilling Technology Optimization and Its Field Test in the Shunbei Block

Shiyou jixie, 2020
High-speed rotary percussive drilling technology is a new type of high-efficiency rock breaking technology based on PDM drilling and self-oscillating rotary percussive drilling.
Yu Yang, Liu Shiyin
doaj  

Kinematics and dynamics analysis of new rotary-percussive PDM drilling tool

Journal of Low Frequency Noise, Vibration and Active Control, 2021
This paper presents a new drilling tool with multidirectional and controllable vibrations for enhancing the drilling rate of penetration and reducing the wellbore friction in complex well structure. Based on the structure design, the working mechanism is
Jialin Tian, Xuehua Hu, Liming Dai, Lin Yang, Yi Yang, Raju Mallick   +5 more
doaj   +1 more source

125 years of exploration and research at Gough's Cave (Somerset, UK) 125 ans d'exploration et de recherches à Gough's Cave (Somerset, Royaume‐Uni)

Journal of the Royal Anthropological Institute, EarlyView.
Our understanding of the recolonization of northwest Europe in the period leading up to the Lateglacial Interstadial relies heavily on discoveries from Gough's Cave (Somerset, UK). Gough's Cave is the richest Late Upper Palaeolithic site in the British Isles, yielding an exceptional array of human remains, stone and organic artefacts, and butchered ...
Silvia M. Bello, Mark D. Lewis, Simon A. Parfitt   +2 more
wiley   +1 more source

Mortal relationality: waria family care and the ethics of dying in Bali Relationnalité mortelle : soins familiaux des waria et éthique des mourants à Bali

Journal of the Royal Anthropological Institute, EarlyView.
Can a good death occur for those who balance on the edges of grievability? In Bali, where death marks a transition within the cycles of reincarnation, a good death depends on the mortuary care performed by intimate others – care that may be foreclosed to those whose lives are shaped by stigma.
Sylvia Tidey
wiley   +1 more source

Hawaii Scientific Drilling Project 1993 [PDF]

, 1994
Content: Project Summary, History of Hawaii Project, Permit History, Continental Scientific Drilling Office's Role, Setup and Coring of Kahi Puka Site, Downhole Problems, Cures for Problems, Conclusions, Appendices: Correspondence for Increase in Depth ...

core   +3 more sources

An Experimental Approach on Pearl Shell (Pinctada margaritifera) for a Microwear Study of Shell Artefacts From French Polynesia

Archaeometry, EarlyView.
ABSTRACT Pinctada margaritifera (black‐lipped pearl oyster) artefacts are ubiquitous in the archaeological record throughout the Pacific and particularly in Polynesia. Despite efforts towards the development of typologies, the lack of microwear and use‐wear studies has prevented the development of technological approaches. We used 20 pearl shell valves
Jemma McGloin, Sofia Samper‐Carro, Guillaume Molle   +2 more
wiley   +1 more source

Chironomid‐based summer temperature reconstruction of the Eemian–Weichselian transition at Lichtenberg, northern Germany

Boreas, EarlyView.
Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink, Bartosz Kotrys, Michael Hein, Xuan Li, Neda Rahimzadeh, Agnieszka Gruszczyńska, Marcel Weiss, Brigitte Urban, David Colin Tanner, Tobias Lauer, Antje Schwalb   +10 more
wiley   +1 more source

Towards an ‘absolute’ timing of biostratigraphic and environmental phases from the Saalian late glacial to the Weichselian pleniglacial in central Europe—Insights from a lacustrine succession in Lichtenberg, northern Germany

Boreas, EarlyView.
Palynological records are central to the biostratigraphic subdivision of the Late Pleistocene in central Europe. Yet many interglacial and interstadial phases—such as the Eemian, Brörup and Odderade—remain only poorly constrained in time due to limited numerical dating.
Michael Hein, Thomas Kasper, Alexis Badai Samudra, Martin Theuerkauf, Markus Lothar Fischer, Neda Rahimzadeh, Maria Sekar Proborukmi, Sonja Rigterink, Agnieszka Gruszczyńska, Christian Zeeden, Simon Parfitt, David John Horne, Lucy Roberts, Dustin White, Lisa Brogmus, Hans von Suchodoletz, Tobias Lauer, Marcel Weiss, David Colin Tanner, Brigitte Urban   +19 more
wiley   +1 more source

Effect of Bit Configuration in Impact Penetration Tests with Button Bits

Journal of MMIJ, 2016
Computer simulation of percussive rock drilling requires appropriate numerical models for the interactions among the drill body, rod, rod joint, bit, and rock.
Yingzong LIANG, Kimihiro HASHIBA, Katsunori FUKUI, Masahiro KOIZUMI, Toshio MATSUDA   +4 more
doaj   +1 more source