Results 11 to 20 of about 79,715 (260)
Understanding the rebound surface hardness of concrete
Journal of Civil Engineering and Management, 2015 Surface hardness testing of materials can be considered as the oldest method to get information about strength related material properties. In recent decades the rebound hammer has been the most popular surface hardness testing device for concrete ...
Katalin Szilágyi +2 more
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On the hardness of finding normal surfaces [PDF]
Journal of Applied and Computational Topology, 2021 For many fundamental problems in computational topology, such as unknot recognition and $3$-sphere recognition, the existence of a polynomial-time solution remains unknown. A major algorithmic tool behind some of the best known algorithms for these problems is normal surface theory.
Benjamin A. Burton, Alexander He 0001
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Hard spheres on the gyroid surface [PDF]
Interface Focus, 2012 Abstract We find that 48/64 hard spheres per unit cell on the gyroid minimal surface are entropically self-organized. Striking evidence is obtained in terms of the acceptance ratio of Monte Carlo moves and order parameters. The regular tessellations of the spheres can be viewed as hyperbolic tilings on the Poincaré disc with a ...
Tomonari, Dotera +2 more
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Mechanical characterisation of water-jet shot peened H13 tool steel surface
Journal of Mechanical Engineering and Sciences, 2022 A wear-resistant surface is achievable via the surface treatment of various sources such as laser, water-jet, ion beam, and plasma. This paper investigates the parameters of water-jet shot-peened H13 tool steel for minimum surface roughness and maximum ...
N. Anati +3 more
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Splitting (complicated) surfaces is hard [PDF]
Computational Geometry, 2006 The authors solve the optimization problem of finding the shortest simple cycle that separates an orientable surface (2-manifold with boundary) into two topologically non-trivial components. The cycle is a continuous map of the unit circle on the considered surface. Firstly, the proof that computing the shortest splitting cycle on a given surface is NP-
Erin W. Chambers +4 more
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Journal of Wood Science, 2021 The sapwood and heartwood of plantation sugi wood (Cryptomeria japonica), and plantation hinoki (Chamaecyparis obtusa) wood were flat-sawn into timbers, then kiln-dried to a MC level below 12%. These timbers were further processed into specific sizes and
Rongfeng Huang +3 more
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Effects of Adding TiO2 Nanoparticles on Flexural Strength and Hardness of Two New Commercial Flowable Dental Composites [PDF]
Journal of Dental Materials and Techniques, 2022 Introduction The present study aimed to investigate the effect of adding TiO2 nanoparticles on the flexural strength and hardness of two dental composites.
Fatemeh Koohpeima +2 more
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The surface hardness of tablets
Journal of Pharmacy and Pharmacology, 1970 AbstractA pneumatic micro-indentation apparatus has been used to determine the hardness of tablets of aspirin at various points on their diameter. All the tablets were 13 mm diameter; the compaction pressure and the particle size of the initial material were varied.
K, Ridgway, M E, Aulton, P H, Rosser
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Experimental study on grinding surface quality of DD9 nickel-based single crystal super-alloy
Hangkong gongcheng jinzhan, 2023 Turbine blade root are commonly processed by grinding, and the grinding process parameters determine the surface quality and fatigue performance.The effect and mechanism of grinding parameters are investigated on the surface roughness and hardness of ...
JIN Qichao +3 more
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Process parameters optima in quick-point grinding ceramics based on the intelligent algorithm
Advances in Mechanical Engineering, 2020 This article studied the relationship between surface roughness and surface micro hardness of the hard-brittle materials and the process parameters in quick-point grinding, and then established the prediction model for the surface micro hardness and ...
Yunguang Zhou +4 more
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