Concrete with nanomaterials and fibers for self-monitoring of strain and cracking subjected to flexure

The nano-carbon black (NCB) and conductive fibers were added as multiple conductive materials to produce the electric conductive and ductile concrete. The effect of the NCB, CF and SF on the workability of fresh concrete was analyzed, the relationships between the FCR and the strain of initial geometrical neutral axis (IGNA) were established, and the self-sensing ability to the load-deflection process and cracking behavior of triphasic conductive concrete beam subjected to bending were investigated. The relationship between the fractional change in surface resistance (FCR) and the crack opening displacement (COD) of conductive concrete beams has been established. The results showed that the relationship between the FCR and the IGNA strain can be described by the First Order Exponential Decay function, and the slope of this function can reflect the sensitivity of the conductive concrete. A linearly correlation between FCR and COD was observed.(undefined)info:eu-repo/semantics/publishedVersio

A simple and effective method for the analytic description of important optical beams, when truncated by finite apertures

In this paper we present a simple and effective method, based on appropriate superpositions of Bessel-Gauss beams, which in the Fresnel regime is able to describe in analytic form the 3D evolution of important waves as Bessel beams, plane waves, gaussian beams, Bessel-Gauss beams, when truncated by finite apertures. One of the byproducts of our mathematical method is that one can get in few seconds, or minutes, high-precision results which normally require quite long times of numerical simulation. The method works in Electromagnetism (Optics, Microwaves,...), as well as in Acoustics. OCIS codes: (999.9999) Non-diffracting waves; (260.1960) Diffraction theory; (070.7545) Wave propagation; (070.0070) Fourier optics and signal processing; (200.0200) Optics in computing; (050.1120) Apertures; (070.1060) Acousto-optical signal processing; (280.0280) Remote sensing and sensors; (050.1755) Computational electromagnetic methods.Comment: Paper of 21 pages with 13 Figures. Source file in LaTe

Fermions tunneling from higher-dimensional charged AdS black hole in dRGT massive gravity within modified dispersion relation

The tunneling behavior of fermions with half-integral spin from a higher dimensional charged anti-de Sitter (AdS) black hole in de Rham, Gabadadze and Tolley (dRGT) massive gravity is investigated via a modified Hamilton-Jacobi equation. The results demonstrate that the modified thermodynamic quantities not only are related to the properties of the higher dimensional charged AdS black hole in dRGT massive gravity but also depend on the parameter $\beta$, the coupling constant $\sigma$ and the mass of emitted particles $m$. In addition, the modified Hawking temperature is higher than the original temperature; hence, the effect of MDR can significantly enhance the evolution of the black hole. Besides, our results can be verified using the modified Stefan-Boltzmann law.Comment: 7 pages, corrected typo