Results 101 to 110 of about 398,792 (302)
Auctioning Rough Diamonds: A Competitive Sales Process for BHP Billiton’s Ekati Diamonds [PDF]
We describe a new approach for selling rough diamonds through competitive auctions. The classical approach of De Beers—giving each customer a bag of stones and a take-it-or-leave-it price—worked well in near monopoly circumstances, but is ill-suited for ...
Peter Cramton +2 more
core
Formation and decay of electron-hole droplets in diamond
, 2004 We study the formation and decay of electron-hole droplets in diamonds at both low and high temperatures under different excitations by master equations.
J. H. Jiang +7 more
core +1 more source
Advanced Engineering Materials, EarlyView.This study investigates the tribological response of 60NiTi alloy under dry, water‐lubricated and high‐temperature conditions. The alloy exhibits decreasing wear volume and friction with increasing temperature due to the formation of protective oxide layers. The work clarifies dominant wear mechanisms and demonstrates the suitability of 60NiTi for high‐
Anthony Onyebuchi Okoani +2 more
wiley +1 more source
The diamond market: current state and prospects of development
Ученые записки Российской академии предпринимательства, 2021 The article discusses the current diamond market, largest diamond foreign companies, as well as the role and place of Russian «ALROSA» on the market in terms of sanctions, imposed by Western countries against Russia.
E. A. Barinov, I. V. Lukashenko
doaj
Advanced Engineering Materials, EarlyView.The growing demand for lightweight, nontoxic, and multifunctional gamma shielding materials has intensified efforts to find alternatives to conventional lead and aluminum‐based protectants. In this work, we develop epoxy quartz fabric composites reinforced with cobalt chloride (CoCl2) microparticles, fabricated via hand lay‐up with varying filler ...
Summan Urooge +7 more
wiley +1 more source
, 2016 Pulsed ESR experiments are reported for ensembles of negatively-charged nitrogen-vacancy centers (NV$^-$) in diamonds at X-band magnetic fields (280-400 mT) and low temperatures (2-70 K).
Lyon, S. A. +4 more
core +1 more source
Advanced Engineering Materials, EarlyView.High‐frequency (HF) welding of steel is limited by oxide inclusions that degrade weld quality. This study demonstrates, for the first time, the integration of a nonthermal Ar/H2 dielectric barrier discharge (DBD) plasma jet into HF welding. Local plasma treatment provides effective shielding and in‐situ oxide reduction, resulting in markedly fewer and ...
Viktor Udachin +4 more
wiley +1 more source
Understanding diamond pricing using unconditional quantile regressions [PDF]
, 2013 This paper investigates the relationship between the selling price of diamonds and their weight in carats. For this purpose, we use a unique sample of 112,080 certified diamonds collected from www.info-diamond.com during the first week of July 2011.
Vaillant, Nicolas G. +1 more
core +1 more source
Hitting Diamonds and Growing Cacti
, 2010 We consider the following NP-hard problem: in a weighted graph, find a minimum cost set of vertices whose removal leaves a graph in which no two cycles share an edge.
A. Becker +6 more
core +1 more source
Advanced Engineering Materials, EarlyView.Carbon nanomaterial‐reinforced epoxy composites exhibit pronounced piezoresistive behavior, enabling intrinsic damage sensing under cyclic and fatigue loading. This review critically compares carbon nanotube and graphene systems, correlating filler content, percolation threshold, and gauge factor with sensing stability and damage evolution.
J. M. Parente +3 more
wiley +1 more source