For technical reasons, NP-hardness is a concept most often applied to decision problems, meaning questions with a yes/no answer.
In order to ensure toughness and contact fatigue resistance (CFR) of rails, the present technical standards restrict the hardness of rails to be beneath HB400 and forbid the martensite structure in rails.
You are not hard for hardness's sake.
The aim of this work was to investigate the structural mechanisms of the enhanced hardness of the technical alloy Ti 6Al 4V due to N+-implantation and its degeneration.
Chemical analysis, mechanical tests and metallurgical inspections show that the elemental composition, tensile strength and hardnesses correspond to the technical requirements and there are no abnormal phenomena in microstructures either in the bodies or in the welded seams.
In this technical paper,microstructure,chemical composition,tensile properties and hardness are studied for the wrought and additive manufactured SLM cylindrical bar.
Based on these measurements, the deposition of crystalline γ-alumina with high hardness and good adhesion under technical conditions was achieved.
Based on customer requirements, the most important of product technical specifications found from QFD were the sweetness and hardness.
Since the synthesis of the boron nitride in its cubic crystallographic structure, cBN, a material with exceptionally high hardness and special properties was developed for technical engineering applications.
The technical reasons for choosing the sites mainly relate to the hardness of the rock and the landscape topography.
In later Mohist thought, "hard-white" or "as hard to white" (jian bai) is a technical term for the relation between two things or two features of a thing that are inseparable and "mutually pervasive"—that is, they completely coincide throughout the same spatial location.[7] The paradigm of such features is the hardness and whiteness of a completely white stone.
