Search results for "PICO"

An update in periapical surgery

2006

Periapical surgery has largely improved at all levels due to new technologies provided by researchers throughout the last years. The aim of this article is to carry out a bibliographic revision of the last seven years. For this reason, we will analyse the studies published in Medline and the most important spanish dental magazines. The subjects to investigate are mainly based on the incorporation of ultrasonic root-end, which allow the performance of small and adjusted retrograde cavities; as well as the new filling materials. We also include magnifying glasses or surgical microscope to the work material, plus surgical laser and the application of guided tissue regeneration.

Historia del pensamiento político moderno (08 Socialismo utópico)

2010

1.- Robert Owen / Padre del cooperativismo. 2.- Charles Fourier / Falansterios. 3.-Henri de Saint-Simón. Fabianismo. La Internacional. &&&&& Historia del Pensamiento Político Moderno. HPPM. La asignatura de Historia del Pensamiento Político se imparte en a la Licenciatura de Ciencias Políticas y de la Administración, Derecho y Sociología y en grado. Historia del Pensamiento Político Moderno tiene como objetivo ofrecer una visión de aspectos centrales del pensamiento político moderno, del siglo XVI al XX. Los textos de los autores escogidos constituyen el punto de apoyo fundamental en el desarrollo del programa, por lo que los estudiantes deben hacer una lectura previa al tratamiento de los …

Interactions between bacteria and Cryptosporidium molnari in gilthead sea bream (Sparus aurata) under farm and laboratory conditions

2006

The possible interaction of Cryptosporidium molnari and bacteria in gilthead sea bream (Sparus aurata) was studied. Epidemiological data from a pathological survey under farm conditions were analyzed. In addition, parasite and bacteria burdens were studied in experimental models in which naturally and experimentally parasitized fish were challenged with a particular strain of Vibrio harveyi (H57). All the bacteria species present were studied. Under farm conditions, the parasite was more prevalent when mortality or morbidity cases (study C) occurred than in randomly sampled fish (study B). In study C, parasite abundance was significantly higher in bacteria-negative fish, and total bacteria …

Picosecond absorption spectroscopy: Methods and applications in photophysical and photochemical systems

1985

Remitted photon path length in human skin, skin phantoms and cell cultures

2020

An experimental method for remitted photon path length measurements in scattering media has been developed and tested on human skin and skin neoplasms, skin phantoms and cell cultures. The photon time-of-flight (PTOF) measurement method was used in this study, where the photon travel time was converted into path length. Remitted light signals were obtained using a picosecond broadband laser and a set of narrowband interference filters in spectral rang 520 – 760 nm. Five different distances of 1, 8, 12, 16 and 20 mm between the source and detector fibers were used. Measurements were performed at different wavelengths and distance combinations; they were taken from human skin and skin malform…

Temas e interpretaciones del derecho sucesorio italiano

2021

El articulo quiere mostrar que las interpretaciones de las instituciones del derecho de sucesiones que consideran el interés familiar, como expresión del principio de solidaridad (cada vez más en una protección patrimonialista de la legitimidad), siempre prevalente sobre todos los demás intereses, ya no pueden ser compartidas, porque la solidaridad no se distingue del personalismo. Modernizar el derecho de sucesiones no significa tener que abdicar en favor del contrato, sino descubrir el valor de la autonomía privada y el potencial del acto de última voluntad. Es la centralidad de la persona humana y no sólo el principio de solidaridad (más aún si se entiende en un sentido patrimonialista) …

Ultrafast stimulated Raman parallel adiabatic passage by shaped pulses

2009

We present a general and versatile technique of population transfer based on {\it parallel adiabatic passage} by femtosecond shaped pulses. Their amplitude and phase are specifically designed to optimize the adiabatic passage corresponding to parallel eigenvalues at all times. We show that this technique allows the robust adiabatic population transfer in a Raman system with the total pulse area as low as 3 $\pi$, corresponding to a fluence of one order of magnitude below the conventional stimulated Raman adiabatic passage process. This process of short duration, typically pico- and subpicosecond, is easily implementable with the modern pulse shaper technology and opens the possibility of ul…

Si and Si-rich silicon-nitride waveguides for optical transmissions and nonlinear applications around 2 µm

2019

We show that cm-long silicon and silicon-rich silicon nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm. We report the transmission of a 10 Gbit/s signal with negligible power penalty. Parametric conversion in both continuous and pulsed pump regimes is also demonstrated, as well as the spectral broadening of picosecond pulses.

Generation of aperiodic picosecond pulses sequences from incoherent optical waves

2007

We present an original method to generate optical pulses trains with random time-interval values from incoherent broadband sources. Our technique relies on the remarkable properties of a line made of cascaded SPM-based optical regenerators.

All-fibered high-quality 28-GHz to 112 GHz pulse sources based on nonlinear compression of optical temporal besselons

2021

The generation of high quality pulse trains at repetition rates of several tens of GHz remains a crucial step for optical telecommunications, optical sampling or component testing applications. Unfortunately, the current bandwidth limitations of optoelectronic devices do not allow the direct generation of well-defined optical pulse trains with low duty cycles. An attractive solution is based on a direct temporal phase modulation that is then converted into an intensity modulation thanks to a dispersive element that imprints a spectral quadratic phase. Picosecond pulses at repetition rates of several tens of GHz have been successfully demonstrated [1] . However, this approach suffers from a …