Results 241 to 250 of about 517,211 (302)

Radiation Hardness and Self‐Healing of Perovskite Solar Cells

Advanced Materials, 2016
Felix Lang, Giovanni Landi, Bernd Rech   +2 more
exaly   +2 more sources

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Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness

2008
  +10 more sources

Dense high-entropy boride ceramics with ultra-high hardness

Scripta Materialia, 2019
Highly dense high-entropy boride ceramics with ultra-high hardness were prepared by spark plasma sintering of the self-synthesized high-entropy boride powders.
Yan Zhang, Wei‐Ming Guo, Jiang Zebin, Qi‐Qi Zhu, Shikuan Sun, Y. You, K. Plucknett, Hua-Tay Lin   +7 more
semanticscholar   +1 more source

A model of hardness and fracture toughness of solids

Journal of Applied Physics, 2019
Hardness and fracture toughness are some of the most important mechanical properties. Here, we propose a simple model that uses only the elastic properties to calculate the hardness and fracture toughness. Its accuracy is checked by comparison with other
E. Mazhnik, A. Oganov
semanticscholar   +1 more source

Effect of reinforced aluminium alloy LM30 with pure ceramic particles to evaluate hardness and wear properties

Materials research innovations (Print), 2020
In this paper, the hardness and wear properties of pure ceramic particles like silicon carbide, boron carbide and graphite are considered in micron size with the reinforced aluminium LM30 metal matrix composites. The stir casting setup is used to prepare
T. Sathish, S. Saravanan, V. Vijayan
semanticscholar   +1 more source

Hard Instances of Hard Problems

2000
This paper investigates the instance complexities of problems that are hard or weakly hard for exponential time under polynomial time, many-one reductions. It is shown that almost every instance of almost every problem in exponential time has essentially maximal instance complexity.
Jack H. Lutz, Vikram Mhetre, Sridhar Srinivasan   +2 more
openaire   +1 more source

High hardness and fatigue resistance of CoCrFeMnNi high entropy alloy films with ultrahigh-density nanotwins

, 2020
Development of film materials has been limited by the hardness-fatigue resistance trade-off. The purpose of the present study was to obtain films with a combination of both high hardness and strong fatigue resistance.
Ze-xin Wang, Cheng Wang, Yilu Zhao, Ya-Chu Hsu, Chia-Lin Li, J. Kai, C. Liu, Chun-Hway Hsueh   +7 more
semanticscholar   +1 more source

Thermodynamic hardness and the maximum hardness principle

The Journal of Chemical Physics, 2017
An alternative definition of hardness (called the thermodynamic hardness) within the grand canonical ensemble formalism is proposed in terms of the partial derivative of the electronic chemical potential with respect to the thermodynamic chemical potential of the reservoir, keeping the temperature and the external potential constant.
Marco Franco-Pérez, José L. Gázquez, Paul W. Ayers, Alberto Vela   +3 more
openaire   +2 more sources

On the Hardness of Reoptimization

2008
We consider the following reoptimization scenario: Given an instance of an optimization problem together with an optimal solution, we want to find a high-quality solution for a locally modified instance. The naturally arising question is whether the knowledge of an optimal solution to the unaltered instance can help in solving the locally modified ...
Hans-Joachim Böckenhauer, Juraj Hromkovic, Tobias Mömke, Peter Widmayer   +3 more
openaire   +1 more source

Effects of spark plasma sintering temperature on densification, hardness and thermal conductivity of titanium carbide

Ceramics International, 2018
The effects of spark plasma sintering (SPS) temperature on densification, microstructure, hardness and thermal conductivity of monolithic TiC ceramics were studied.
A. Babapoor, Mehdi Shahedi Asl, Z. Ahmadi, A. S. Namini   +3 more
semanticscholar   +1 more source