Results 51 to 60 of about 31,598 (181)

Variation of the Diameter of the Sun as Measured by the Solar Disk Sextant (SDS)

open access: yes, 2013
The balloon-borne Solar Disk Sextant (SDS) experiment has measured the angular size of the Sun on seven occasions spanning the years 1992 to 2011. The solar half-diameter -- observed in a 100-nm wide passband centred at 615 nm -- is found to vary over ...
Girard, T. M.   +5 more
core   +3 more sources

Performance of concrete with and without crystalline admixtures under repeated cracking/healing cycles

open access: yesMATEC Web of Conferences, 2018
The present paper analyses the repeatability of self-healing capacity in fibre reinforced concretes, both autogenous or enhanced by the addition of crystalline admixtures.
Ferrara Liberato   +3 more
doaj   +1 more source

Hamiltonian cycles and subsets of discounted occupational measures

open access: yes, 2019
We study a certain polytope arising from embedding the Hamiltonian cycle problem in a discounted Markov decision process. The Hamiltonian cycle problem can be reduced to finding particular extreme points of a certain polytope associated with the input ...
Eshragh, Ali   +3 more
core   +1 more source

STUDY ON REINFORCEMENT OF SPLITTING TIMBER BY DRIVING WEDGE TEST

open access: yesJournal of Structural and Construction Engineering (Transactions of AIJ), 2008
A method of driving wedge test was proposed in order to qualify the effect of reinforcement on splitting strength of timber. The wedge was quasi-statically driven into timber in its longitudinal direction by structural testing machine, during which the load and displacement were measured until splitting failure.
openaire   +2 more sources

Fatigue crack behaviour: comparing three-point bend test and wedge splitting test data on vibrated concrete using Paris' law

open access: yesFracture and Structural Integrity, 2016
The fatigue behaviour of concrete has become more important for the design of constructions due to the desire to build slimmer structures, which are more sensitive to fatigue loading.
S. Seitl   +2 more
doaj  

Determination of Fracture Properties of Concrete Using Size and Boundary Effect Models

open access: yesApplied Sciences, 2019
Tensile strength and fracture toughness are two essential material parameters for the study of concrete fracture. The experimental procedures to measure these two fracture parameters might be complicated due to their dependence on the specimen size or ...
Xiaofeng Gao   +8 more
doaj   +1 more source

Transmission properties in waveguides: An optical streamline analysis [PDF]

open access: yes, 2012
A novel approach to study transmission through waveguides in terms of optical streamlines is presented. This theoretical framework combines the computational performance of beam propagation methods with the possibility to monitor the passage of light ...
Banerjee   +36 more
core   +3 more sources

Demonstration of an erbium doped microdisk laser on a silicon chip [PDF]

open access: yes, 2006
An erbium doped micro-laser is demonstrated utilizing $\mathrm{SiO_{2}}$ microdisk resonators on a silicon chip. Passive microdisk resonators exhibit whispering gallery type (WGM) modes with intrinsic optical quality factors of up to $6\times{10^{7 ...
A. Polman   +4 more
core   +2 more sources

Projeto, adaptação, instalação e testes preliminares para um sistema de medida de energia de fratura de materiais cerâmicos pelo método da cunha Design, adaptation, installation and preliminary testing of a fracture energy measuring system for ceramic materials based on the wedge splitting method

open access: yesCerâmica, 2008
Este trabalho discute o projeto e a instalação dos dispositivos para determinação da energia de fratura em materiais cerâmicos utilizando o método da cunha patenteado, além dos resultados preliminares de carga máxima e energia de fratura para duas ...
S. Ribeiro   +2 more
doaj   +1 more source

Quantum Extremal Surfaces: Holographic Entanglement Entropy beyond the Classical Regime

open access: yes, 2015
We propose that holographic entanglement entropy can be calculated at arbitrary orders in the bulk Planck constant using the concept of a "quantum extremal surface": a surface which extremizes the generalized entropy, i.e.
Engelhardt, Netta, Wall, Aron C.
core   +1 more source

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