Search results for "Fiber"

The study and optimization of the behavior and energy absorbed in the frontal impact by a rectangular metal workpiece with an Origami core

2021

The bumper systems (beams and face bars) are parts of the car body structure, one of the most important components of an auto vehicle because of its role in absorbing the energy of an impact by deformation. The main objective of this paper is to study, optimize the built shape of the frontal members beams used in the endurance structure of motor vehicles in terms of their ability to absorb internal energy resulting from a frontal impact under the principles of sustainability. The study combines the classical technology used in the construction of vehicles with, the Origami Engineering” technique, which is generally used by NASA, but also by engineers in other fields: aeronautics, nanotechno…

Computational engineering to enhance the photovoltaic by end‐capped and bridging core alterations: Empowering the future with solar energy through sy…

2021

Core-Excitation in Molecules: Formation of Cations and Anions

1996

A review of colour center and nanostructure creation in LiF under heavy ion irradiation

2015

A study of radiation damage in LiF crystals under irradiation with MeV–GeV energy ions, from 12C to 238U, at temperatures varying from 8 to 300 K, depending on the ion energy, energy loss and irradiation temperature, is presented. For light ions (12C, 14N) at low fluences, it is mainly color centers that are created. Increasing the fluence leads to the overlapping of tracks and the creation of more complex color centers, defect aggregates and dislocations. For ions with an energy loss above a threshold value (dE/dx = 10 keV nm−1) the tracks exhibit a central core damage region with a radius of 1–2 nm, surrounded by an extended halo which mainly contains single color centers. In this case, i…

Electro-optic dynamics in thermally poled Ge core doped silica fibre

2003

The electro-optic (EO) dynamics of a twin hole germania core doped fibre when an applied electric field at elevated temperature modifies the symmetry of glass is reported. An EO peak was recorded after 10 min poling. The results were interpreted with a two-space charge model.

Supercontinuum generation with 532 nm quasi-continuum pulses in photonic crystal fibre tapers

2007

We report experimental results on supercontinuum generation in PCF tapers using quasi-continuous pump pulses of 7 ns duration at 532 nm. SC generation in normal and anomalous dispersion regimes are presented. Introduction Supercontinuum generation (SC) in photonic crystal fibres (PCF), fibre tapers, and PCF tapers has been demonstrated in the past with pump pulses of fs, ps, and tenths of ns duration [1-2]. Here, we present experimental results on SC generation in PCF tapers using quasi-continuous pump pulses of 7 ns duration at 532 nm. Fabrication of the PCF tapers The PCF from which the tapers were made, was a large-air-hole PCF ("cobweb" PCF) with two rings of air holes around a solid si…

Interaction strength and shape difference for the h9/2 and h11/2 configurations in163Tm

1991

The strongly shape driving πh9/2[541]l/2− configuration with α=+1/2 exhibits some anomalous, and so far unexplained, features concerning the crossing frequency, ħωc, the aligned angular momentum, ix, and interaction strength, at the alignment of the first pair of i13/2 quasineutrons in several odd-Z rare earth-nuclei. The h9/2[541]1/2− and h11/2[523]7/2− bands have been studied in the stably deformed rare-earth nucleus163Tm to investigate these features. A difference in band crossing frequency of ∼ 80 keV between the two bands is found. Rotational bands built on these two configurations have been found to cross in the spin range I=25/2–29/2 ħ. Theγ-decay pattern between the two bands is est…

High-spin levels in 63 145 Eu82

1996

The level scheme of theN=82 nucleus145Eu has been extended toI=(55/2) andEx=11.2 MeV in an experiment with the Tessa Compton-suppressed Ge detector array using the127I(22Ne,4n) reaction. Most of the complicated and irregular level scheme of145Eu can be interpreted as proton multi-quasiparticle states in comparison to the64146Gd82 core nucleus but also excitations across the neutronN=82 core have been observed.

Restarting activity in radio galaxies

2002

We present observations of two radio galaxies, J1835+620 and 3C338, both with signs of having passed through different stages of core activity. The former presents two symmetric and bright components within a typical FR II structure, possibly resulting from two distinct phases of activity; the latter is a FR I radio galaxy with two separated regions with different age properties, possibly due to a switch-off and -on cycle in its core. In both sources, the optical counterpart lies in a group of galaxies with indications of mutual interaction, a scenario often invoked to explain triggering of core activity.

Fast Response Vibration Sensor Based on Bragg Gratings Written on Tapered Core Fibers

2006

Bragg gratings written in tapered core fibers are used to measure mechanical vibrations with a time response better than 10 μs. The system is compact, low-cost and can be wavelength multiplexed.