there is a worldwide interest in using fibers of different types in concrete mixtures. in this regard, as the use of pet fibers has gradually increased during the last decade, this study aims to investigate the effects of pet fibers on the mechanical properties of hardened concrete and the workability of fresh concrete. to this end, different contents of pet fibers (pc= %0, %0.5, %1 and %1.5) a...

We demonstrate a high sensitivity all-fiber spectroscopic methane sensor based on photothermal interferometry. With 2.4-m-long anti-resonant hollow-core fiber, 1654 nm distributed feedback laser, and Raman fiber amplifier, noise-equivalent concentration of ∼ <...

The strength and fatigue behavior of bulk fused silica is well understood in terms of the growth of microcracks under the combined influence of stress and environmental attack. The behavior of high strength, flaw free silica optical fiber shows significant differences from the bulk material for poorly understood reasons making long term predictions unreliable. It is known that silica fiber stre...

For the application of high repetition rate WDM pulse train generation from a femtosecond modelocked fiber laser, the direct space-to-time pulse shaper and a properly designed arrayed waveguide grating (AWG) are equivalent. The analogy between the bulk optics and integrated configuration is explored for this application. The critical design parameters of the AWG are the free spectral range and ...

This paper is devoted to the adaptation of the method developed in Dolbeault et al. [2011, 2009] to a Fokker-Planck equation for fiber lay-down which has been studied in Bonilla et al. [2007/08], Götz et al. [2007]. Exponential convergence towards a unique stationary state is proved in a norm which is equivalent to a weighted L norm. The method is based on a micro / macro decomposition which is...

This paper gives a short summary of the central role played by Ed Brown’s “twisting cochains” in higher FranzReidemeister (FR) torsion and higher analytic torsion. Briefly, any fiber bundle gives a twisting cochain which is unique up to fiberwise homotopy equivalence. However, when they are based, the difference between two of them is a higher algebraic K-theory class measured by higher FR tors...

We demonstrate the generation of error-free binary-phase-shift-keyed (BPSK) data at 5 Gb/s using a silicon microring modulator. The microring-modulated BPSK signal is propagated at fiber lengths up to 80 km, maintaining error-free performance, while demonstrating resilience to chromatic dispersion. Bit-error-rate measurements and eye diagrams show near equivalent performance of a microring-base...

In this work are considered some questions of Monte-Carlo modeling on nontrivial bundles. As a basic example is used problem of generation of straight lines in 3D space, related with modeling of interaction of a solid body with a flux of particles and with some other tasks. Space of lines used in given model is example of nontrivial fiber bundle, that is equivalent with tangent sheaf of a sphere.

Abstract The cable industry is beginning to migrate to 100G core optical transport waves, which greatly improve fiber utilization while lowering transponder count for equivalent transport bandwidth. However, transporting 100G waves requires complex optical modulation to preserve performance and increase spectral efficiency. These modulation methods require several additional discrete optical co...

Essentially, there exists just the dimension segregating (square) matrix subspaces. In view of algebraic operations, this quantity is not particularly descriptive. For differential geometric information on matrix inversion, the second fundamental form is found for the set of inverses of the invertible elements of a matrix subspace. Several conditions for this form to vanish are given, such as b...