Results 51 to 60 of about 860 (198)

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

Truncated drumlins and their implication for past sea level reconstructions

Boreas, EarlyView.
Coastal erosion of glacigenic sediments, particularly in the form of retreating drumlin bluffs, is a key process in paraglacial landscape evolution during periods of relative sea‐level (RSL) rise. As marine transgression reworks formerly subaerial glacial terrains, drumlins act as discrete sediment sources generating characteristic erosional and ...
Riccardo Arosio, Andrew Finlayson, Guillaume Michel, Dayton Dove   +3 more
wiley   +1 more source

Appraisal of Six Natural Mica Reference Materials for In Situ Rb‐Sr Geochronology

Geostandards and Geoanalytical Research, EarlyView.
Key Points Evaluated six natural mica reference materials for in situ LA‐ICP‐MS/MS Rb‐Sr geochronology using geochemical, microstructural and isotopic characterisation. Identified robust primary reference materials: Mount Dromedary biotite (99.37 Ma) and Mica‐Fe biotite (307.75 Ma). La Posta biotite and Högsbo muscovite are suitable secondary reference
Hugo K.H. Olierook, Bruno V. Ribeiro, Janne Liebmann, Kai Rankenburg, Fred Jourdan, Ahmad Redaa, Jarred C. Lloyd, Thomas M. Belgrano, Carlos R. Corella Santa Cruz, Yujin Jegal, Julien Mercadier, Catherine Zimmermann, Jie Yu, Andreas Zametzer, Christopher L. Kirkland, Sarah E. Gilbert, Craig D. Storey, Luc S. Doucet, Isabelle Jones, Louisa Stokes, Thomas Zack, Delia Rösel, Denis Fougerouse, Jonas Kaempf, Priyanjan Datta, Hijas Hameed, Noreen J. Evans, Malcolm P. Roberts, Juraj Farkas, Stijn Glorie, Celia Mayers, R. Adam Frew, Sarah Al Odeh, Chloe E. Roche, Massimo Chiaradia, Alicia M. Cruz‐Uribe, Alan S. Collins, Andreas Karlsson, Anusha Shantha Kumara   +38 more
wiley   +1 more source

Ultra-precision machining test of diamond sand belt for Si₃N₄ ceramic cylindrical roller

Jin'gangshi yu moliao moju gongcheng
ObjectivesSi3N4 ceramic cylindrical rollers show excellent service performance in extreme working conditions, but their hardness and brittleness and other characteristics lead to difficulties in machining.
Hongliang WANG, Songhua LI, Chi JIN, Kai TIAN, Hao GUO, Zichen ZHAO   +5 more
doaj  

A Study of an Online Tracking System for Spark Images of Abrasive Belt-Polishing Workpieces. [PDF]

Sensors (Basel), 2023
Huang J, Zhang G.
europepmc   +1 more source

Development of Arsenopyrite Reference Materials (Sacra and Niko) for In situ Multiple Sulfur Isotope Measurement

Geostandards and Geoanalytical Research, EarlyView.
Key Points New arsenopyrite reference materials (Niko and Sacra) for in situ multiple sulfur isotope measurement. Niko and Sacra are homogenous, near‐stoichiometric arsenopyrite. Niko serves as a primary matrix‐matched reference material, with lower measurement repeatability; Sacra is recommended as a secondary reference and quality control material ...
Bruna Coldebella, Guillaume Barré, Crystal LaFlamme, Laure Martin, Pierre Cartigny   +4 more
wiley   +1 more source

Investigation on Wear Evolution Behavior of Pyramid Belt in Grinding of GH4169 Superalloy

Journal of Manufacturing and Materials Processing
Owing to its unique pyramid-shaped stacked abrasive structure, the pyramid belt pro-vides fine and uniform grinding performance, making it increasingly attractive for precision grinding applications.
Zhijian Tao, Rui Xu, Songjiaming Liu, Xin Huang, Zhao Zhang, Junde Qi, Dinghua Zhang   +6 more
doaj   +1 more source

Explainable Intelligent Framework for Reliable Drilling Rate Prediction and Feature Selection in Complex Sedimentary Formations

Journal of Petroleum Geology, EarlyView.
ABSTRACT Accurate prediction of the drilling rate of penetration (ROP) is crucial to optimizing drilling performance, wellbore stability, enhancing operational efficiency, and reducing the overall cost of hydrocarbon exploration. This study focused on evaluating and comparing different machine learning models for ROP prediction and identifying the most
Mohammad Islam Miah, Md. Asif Uz Zaman Antu, Travis Wiens   +2 more
wiley   +1 more source

Influence of Grinding Parameters on the Removal Depth of 42CrMo Steel and Its Prediction in Robot Electro-Hydraulic-Actuated Abrasive Belt Grinding

Journal of Manufacturing and Materials Processing
Robotic grinding serves as a pivotal embodiment and key technological support of Industry 4.0. Elucidating the influence of robotic grinding parameters on the material removal depth (MRD) of 42CrMo steel and optimizing these parameters are critical to ...
Dequan Shi, Youen Xu, Xuhui Wang, Huajun Zhang   +3 more
doaj   +1 more source