8,627 research outputs found
Zonas de protección de las aguas subterráneas de la cuenca del arroyo de Santo Tomás, Parque Nacional Viñales, Cuba
No full text2. De Bustamante, I., Farfán, H., Corvea, J.L. (2010). Zonas de protección de las aguas subterráneas de la cuenca del arroyo de Santo Tomás, Parque Nacional Viñales, Cuba. Jornadas sobre Geomorfología y Geología Ambiental aplicada a la Gestión de Espacios Naturales Protegidos del Suroeste de Castilla y León y Norte de Extremadura. Ed. Dpto. Geología, Fac. Ciencias, Universidad de Salamanca. Salamanca. ISBN: 978-84-7484-229-6. Depósito Legal: M-32135-2010
Tuning and chirping fiber Bragg gratings by deep etching
No full textWe have demonstrated a new method for tuning and chirping fiber gratings. It relies on etching of a fiber down to very small cladding diameter, so that the propagating optical mode in the fiber interacts with the surrounding media. A tuning range of 4.5 nm has been demonstrated with a potential of much larger tuning range by optimization of fibers. Chirped gratings were also demonstrated with this technique. These chirped gratings are very important for use in fiber dispersion compensation and optical pulse shaping
Long period gratings formed in depressed cladding fibres
No full textIn a single mode fibre of a depressed cladding design, the LP11 mode is leaky but can propagate over a short length of fibre. This leaky LP11 mode instead of the conventional cladding modes can be used in long period gratings, with two extra benefits, I) a larger overlap, giving stronger coupling and II) coupling is insensitive to the glass-air interface therefore packaging is easier
FONI-SPATE: a new fibre optic stress/strain sensor, using a near-infrared variant of the SPATE effect
No full textA new fibre optic stress/strain sensor, for monitoring hot materials is reported. The fibre collects grey body emission from a heated material sample. When the sample is subjected to transient stresses, the radiation is modulated due to the adiabatic changes in its temperature. The modulation is monitored, via a silica fibre, using a near-infrared GaInAs photodetector. This is also believed to be the first demonstration of the SPATE method in the near infrared
Improved thermal sensitivity of fiber Bragg gratings using a polymer overlayer
No full textFibre Bragg gratings have been shown to have a much improved thermal sensitivity when using polymer materials with large thermal expansion coefficients as driving elements. The polymers are fixed to the fibres at an elevated temperature and the fibres are under compression instead of tension at the lower temperatures subsequently used. This allows a much wider tuning range of the Bragg gratings as silica can stand much more compression than tension. A sensitivity of 0.15nm/°C in the 1550nm wavelength regime has been achieved and the Bragg wavelength has been tuned 15nm in the temperature range 0-100°C
Inter-reciprocity applied to electrical networks
No full textElectrical Engineering, Mathematics and Computer Scienc
El papel del estado en la construcción del desarrollo sostenible: el caso del turismo en el caribe insular
No full text[No abstract available
Novel in-line fiber-optic filters and polarisers
No full textNovel in-line devices, based on a tapered fiber whose uniform waist has been metal-coated, are reported. The resonant excitation of a surface plasma mode of the metal film allows for the design of wavelength filters and polarisers
El papel del estado en la construcción del desarrollo sostenible: el caso del turismo en el Caribe Insular.
No full textLa discusión acerca de la pertinencia de la intervención estatal en el mercado ha sido reiterativa en la historia del pensamiento económico. El turismo es otro ejemplo de que la regulación es no sólo necesaria sino fundamental, para corregir las asimetrías de un mercado que está lejos de cumplir los supuestos que motivaron la teoría del interés individual y del beneficio social como resultado. El presente trabajo intenta enfatizar en las implicaciones de ignorar el papel del Estado en la construcción del desarrollo sostenible, haciendo especial énfasis en el turismo en el Caribe insular
'Twas on the beach at Brighton one fine Summer day, I met this handsome man who stole my heart away [first line of chorus]
No full textstrophic with choruspiano and voiceTo Wm. Lingard, Author & Singerads on inside back cover for J.L. Peters stock353-3Johns Hopkins University, Levy Sheet Music Collection, Box
053, Item 027W.D. Raphaelson.Sung by LingardPaleri[?
- …
