Results 141 to 150 of about 646,397 (343)

Specific features of diamonds from modern placers in the zone of high-productive kimberlite diatremes distribution

Мінеральні ресурси України, 2016
Zoning of areas by degree of their prospectivity was carried out by outlined complex investigations and generalization of available material on investigating diamond from modern placers of Central-Siberian sub-province and their comparison with crystals ...
M. M. Zinchuk, V. I. Koptil
doaj  

Multimodal Data‐Driven Microstructure Characterization

Advanced Engineering Materials, EarlyView.
A self‐consistent autonomous workflow for EBSP‐based microstructure segmentation by integrating PCA, GMM clustering, and cNMF with information‐theoretic parameter selection, requiring no user input. An optimal ROI size related to characteristic grain size is identified.
Qi Zhang, Santiago Benito, Özge Özgün, Sebastian Weber, Markus Stricker   +4 more
wiley   +1 more source

Ice-VII inclusions in diamonds: Evidence for aqueous fluid in Earth’s deep mantle

Science, 2018
O. Tschauner, Shichun Huang, E. Greenberg, V. Prakapenka, Chi Ma, G. Rossman, A. Shen, Dongzhou Zhang, M. Newville, A. Lanzirotti, K. Tait   +10 more
semanticscholar   +1 more source

Microstructure Evolution of a VMnFeCoNi High‐Entropy Alloy After Synthesis, Swaging, and Annealing

Advanced Engineering Materials, EarlyView.
The synthesis and processing (rotary swaging and annealing) of the novel VMnFeCoNi alloy is investigated, alongside the estimation of the grain size effect on hardness. Analysis of a wide grain size range of recrystallized microstructures (12–210 µm) reveals a low annealing twin density.
Aditya Srinivasan Tirunilai, Zeki Ayrildi, Buse Şen, Maik Rajkowski, Mathias Redondo Garcia, Markus Stricker, Guillaume Laplanche   +6 more
wiley   +1 more source

Un marchand itinérant sur les routes du diamant :Jean-Baptiste Tavernier

Viatica
Travelling the roads linking Europe and Asia six times, Jean-Baptiste Tavernier (1605-1689) has lived a very singular Indian experience. His travels have a double objective for him: the discovery of exotic lands which he never hesitates to share the ...
Cécile Lugand
doaj   +1 more source

Enumeration of tilings of diamonds and hexagons with defects

, 1998
We show how to count tilings of Aztec diamonds and hexagons with defects using determinants. In several cases these determinants can be evaluated in closed form.
Harald A. Helfgott, Ira, Ira M. Gessel
core   +3 more sources

Fatigue Crack Initiation and Growth in Nanocrystalline Ni at Multiple Length‐Scales

Advanced Engineering Materials, EarlyView.
Overview of miniaturized in situ SEM fatigue setup and resultant fatigue crack growth data for nanocrystalline Ni. The presented study focuses on the analysis of fatigue crack growth rate (FCGR) in focused ion beam‐notched microcantilevers prepared from nanocrystalline (NC) Ni as a model material.
Igor Moravcik, Alexander Jelinek, Markus Alfreider, Jutta Luksch, Anton Hohenwarter, Florian Schaefer, Christian Motz, Daniel Kiener   +7 more
wiley   +1 more source

Influence of Test Temperature and Test Frequency on Fatigue Life of Aluminum Alloy EN AW‐2618A

Advanced Engineering Materials, EarlyView.
The influence of test temperature and test frequency on the fatigue life of EN AW‐2618A is investigated. High‐cycle fatigue tests are performed at different test temperatures and frequencies on the 1000 h/230°C overaged state. Both test parameters reduce fatigue life due to time‐dependent damage mechanisms.
Ying Han, Julian M. Rosalie, Jan Radners, Mauro Madia, Philipp von Hartrott, Birgit Skrotzki   +5 more
wiley   +1 more source

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

The Reverberations of the Covid-19-Hit International Diamond Market on Botswana

The Thinker, 2020
A semi-desert country in southern Africa, Botswana has historically never had any economic significance – a narrative supported by how the country became a British protectorate in 1885, as opposed to the normal trend at the time of being forced into ...
Kalo Makaloba
doaj