Quantum Field Theory on Spacetimes with a Compactly Generated Cauchy Horizon [PDF]
, 1997 We prove two theorems which concern difficulties in the formulation of the quantum theory of a linear scalar field on a spacetime, (M,g_{ab}), with a compactly generated Cauchy horizon.
Kay, Bernard S. +2 more
core +3 more sources
Geometric modular action for disjoint intervals and boundary conformal field theory [PDF]
, 2009 In suitable states, the modular group of local algebras associated with unions of disjoint intervals in chiral conformal quantum field theory acts geometrically.
Buchholz D. +6 more
core +3 more sources
Experimental Study on High-Energy Gas Fracturing Artificial Coal
Applied Sciences, 2022 The low permeability of coal seams has always been the main bottleneck restricting coalbed gas drainage. To improve the permeability of a coal seam, a high-energy gas fracturing technology is proposed.
Junjun Li +4 more
doaj +1 more source
Analysis of wedge splitting test on refractory castable via integrated DIC [PDF]
Journal of the European Ceramic Society, 2016 One of the key mechanical properties of refractories is their toughness. The latter can be evaluated via wedge splitting tests. One such test is analyzed herein with an integrated approach to digital image correlation. The position of the crack tip, stress intensity factors and T-stress are estimated on two faces of the tested sample made of a ...
Vargas, Rafael +4 more
openaire +1 more source
Analysis of accuracy of Williams series approximation of stress field in cracked body – influence of area of interest around crack-tip on multi-parameter regression performance [PDF]
Fracture and Structural Integrity, 2017 A study on the accuracy of an approximation of the stress field in a cracked body is presented. Crack-tip stress tensor is expressed using the linear elastic fracture mechanics (LEFM) theory in this work, more precisely via its multi-parameter ...
J. Sobek, P. Frantík, V. Veselý
doaj +1 more source
Combined damaged elasticity and creep modeling of ceramics with wedge splitting tests
Ceramics International, 2021 Abstract During the crack propagation in common refractory ceramics at high temperatures, creep may occur in the wake of a process zone and in front of a crack tip. To account for this phenomenon, an integrated material constitutive model was developed by combining the mechanical behavior following isotropic damaged elasticity concept and Norton ...
Samadi, S., Jin, S., Harmuth, H.
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MATEC Web of Conferences, 2018 Superabsorbent polymers (SAP) addition as an internal curing (IC) agent in concrete is an approach being adopted for the mitigation of autogenous shrinkage.
Olawuyi Babatunde James +1 more
doaj +1 more source
Characterization of the fracture mechanisms with miniaturized wedge splitting test
Wuhan symposium on refractories, 2019 Characterization of the fracture mechanisms with miniaturized wedge splitting ...
NGUYEN Thanh Hung +3 more
openaire +1 more source
Experimental study on hydraulic fracture behavior of concrete with wedge-splitting testing
Science and Engineering of Composite Materials, 2023 Abstract The aim of this paper is to investigate the water pressure effects on hydraulic fracture behavior of concrete with wedge-splitting testing under dynamic loading. Five waterproof strain gauges are stuck along the crack path to observe the fracture process during the experiments.
Zhao Wenhu +3 more
openaire +2 more sources
Mesoscopic study on historic masonry
, 2008 This paper presents a comprehensive approach to the evaluation of macroscopic material parameters for natural stone and quarry masonry. To that end, a reliable non-linear material model on a meso-scale is developed to cover the random arrangement of ...
Sejnoha, J. +4 more
core +1 more source