Results 11 to 20 of about 185,127 (293)

A relationship between tensile strength and mode I fracture toughness of rocks using the critical distance

open access: yesGeomechanics and Geophysics for Geo-Energy and Geo-Resources, 2023
Correlations between material parameters are useful because they provide a first estimation of unknown parameters. Here, the correlation between the tensile strength and the mode I fracture toughness of rocks is studied.
Jon Justo, Marina Miranda, Jorge Castro
doaj   +1 more source

Pre-Service Teachers’ Academic Identity and their Lived Experiences in Remote Learning: The New Normal in Curriculum Practice [PDF]

open access: yes, 2022
Research ArticleThe Ministry of Tertiary Institutions of South Africa charged post-secondary institutions to implement measures to achieve the government's social distancing policy.
Mphuthi, Mochina, Tshelane, Molaodi
core   +1 more source

Analysis of critical safety distance between tunnel and concealing filled karst cave in the karst area

open access: yesCarsologica Sinica, 2023
If the tunnel construction work is done in the karst area, the tunnel shall keep a certain distance from the karst cave to ensure the stability of the surrounding rock and support.
Wanfeng WANG   +5 more
doaj   +1 more source

Research on Fatigue Life Prediction Method of Key Component of Turning Mechanism Based on Improved TCD

open access: yesMetals, 2022
The main objective of this paper is to accurately obtain fatigue life prediction for the key components of a turning mechanism using the improved theory of critical distances (TCD).
Tingting Wang   +4 more
doaj   +1 more source

Theory of critical distances: A discussion on concepts and applications

open access: yesProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2021
Theory of Critical Distances (TCD) collects several methods adopted in failure prediction of components provided with stress concentration features. The idea of evaluating stress effect in a zone rather than in a single point was proposed decades ago but, only thanks to relatively recent works, TCD concepts showed to be a successful extension of Linear
Delprete C., Maggio L. G., Sesana R.
openaire   +2 more sources

The role of psychological distance in value creation [PDF]

open access: yes, 2015
Purpose – The field of service research has devoted consider able attention to the customer's role as value creator, but there is a lack of research on understanding customers' psychological processes in value creation.
Holmqvist, J, Gronroos, C, Guest, D
core   +1 more source

Critical length parameter of HDPE and its use in fatigue lifetime predictions

open access: yesFracture and Structural Integrity
The contribution describes the fatigue lifetime predictions of polyethylene notched specimens based on the theory of critical distance. The approach uses the line method, which averages the axial stress over the critical distance.
Kamila Koz�kov�   +3 more
doaj   +5 more sources

Applications of the theory of critical distances in failure analysis [PDF]

open access: yesEngineering Failure Analysis, 2011
Abstract The Theory of Critical Distances (TCD) is the name which I use to describe a group of methods employed for the prediction of failure in cases where stress concentrations are present and where the failure mode involves cracking, such as fatigue and brittle fracture. Some of these methods are more than 50 years old, some very recent.
openaire   +3 more sources

Open Distance-Pattern Uniform Graphs [PDF]

open access: yes, 2009
All graphs considered in this paper are finite, simple, undirected and connected. For graph theoretic terminology we refer to Harary [6].
Jose, Bibin K.
core   +1 more source

The influence of communication technologies and approaches to study on transactional distance in blended learning [PDF]

open access: yes, 2007
This paper explores the role played by communication technologies and study orientations in the amplification and reduction of transactional distance in blended learning. Factor analysis and structural equation modelling of different communication modes (
Steve Wheeler, Wheeler, Steve
core   +1 more source

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