Search results for "ITC"

Er:Cr:YSGG laser with electrooptic PLZT ceramics Q-switching Fabry-Perot interferometer output mirror

2001

Summary form only given. Q-switching of Er:Cr:YSGG laser with transparent PLZT ceramics electro-optic modulators was reported previously. The extremely large quadratic EO effect in PLZT allows to build small size moderate control voltages. The high induced birefringence in PLZT results from an essential contribution to polarization (and consequently to the birefringence) of processes with longer relaxation times up to seconds, corresponding to the Er:Cr:YSGG laser operating rate. PLZT ceramics have also a high value of the refractive index (n /spl ap/ 2.2-2.3 for /spl lambda/ = 3 /spl mu/m, slightly depending on PLZT composition and temperature) and thus considerable Fresnel reflections R/s…

Coexistence of single-mode and multi-longitudinal mode emission in the ring laser model

2005

A homogeneously broadened unidirectonal ring laser can emit in several longitudinal modes for large enough pump and cavity length because of Rabi splitting induced gain. This is the so called Risken-Nummedal-Graham-Haken (RNGH) instability. We investigate numerically the properties of the multi-mode solution. We show that this solution can coexist with the single-mode one, and its stability domain can extend to pump values smaller than the critical pump of the RNGH instability. Morevoer, we show that the multi-mode solution for large pump values is affected by two different instabilities: a pitchfork bifurcation, which preserves phase-locking, and a Hopf bifurcation, which destroys it.

Bitcoin e cyber self-laundering: lo sguardo sospettoso della Cassazione sull'impiego di criptovaluta

2023

In Judgment n. 27023 of 2022, the italian Supreme Court recognized the confgurability of the crime of self-money laundering in the conduct of a person who uses the proceeds of crimes committed by him to purchase bitcoin, not directly, but through the intermediation of cryptocurrency exchange companies. The Author takes the pronouncement as a starting point to probe the extent to which the culture of suspicion, with which the anti-money laundering legislation is imbued, and the stigmatization of cryptocurrency have influenced the Supreme Court's guidance, in which there emerges a strong temptation to establish a kind of automatism between the input of illicit proceeds into the bitcoin system…

Bitcoin e rivoluzione digitale internazionale. Note a margine di una sentenza della United States District Court of Columbia.

2021

This Note is about the recent recognition, by the United District Court of Columbia, of bitcoin as 'money'. The Note offers a brief insight of the decision and some reflections on the actual international digital revolution and the current threats/opportunities related to it.

SPECTRAL COMPOSITION OF EATING SOUNDS GENERATED BY CRISPY, CRUNCHY AND CRACKLY FOODS

1995

Separate air and bone conducted food sounds generated by six subjects biting into eight foods were recorded and analysed by a fast Fourier transform (FFT) signal analyser. A panel of 60 subjects classified the 8 foods according to their texture: crispy, crunchy and crackly and these textural characteristics were described by spectral characteristics of biting sounds. Crispy foods (such as extruded flat breads) were found to generate high pitched sounds that show a high level of frequencies higher than 5 kHz, especially for air conduction. Crunchy foods (such as raw carrot) generate low pitched sounds with a characteristic peak on frequency range 1.25 to 2 kHz for air conduction. And crackly…

Gada as an Integrative Factor of Political Organization

1994

Resolving Binding Events on the Multifunctional Human Serum Albumin

2020

Abstract Physiological processes rely on initial recognition events between cellular components and other molecules or modalities. Biomolecules can have multiple sites or mode of interaction with other molecular entities, so that a resolution of the individual binding events in terms of spatial localization as well as association and dissociation kinetics is required for a meaningful description. Here we describe a trichromatic fluorescent binding‐ and displacement assay for simultaneous monitoring of three individual binding sites in the important transporter and binding protein human serum albumin. Independent investigations of binding events by X‐ray crystallography and time‐resolved dyn…

PLZT Electro-optic Q-switch for Er:Cr:YSGG laser

1999

Q-switching of the Er:Cr:YSGG laser at 2.79 micrometers is realized using electrooptic modulators of PLZT X/65/35 ceramics. The high (but slow as compared with single crystals) electrooptical effect in PLZT allowed to construct Q-switches with an aperture larger than 4 X 4 mm 2 , small lengths of 3 - 6 mm, with a control voltage of 1000 - 1500 V. Q-switching is realized using modulators in two modes--as a (lambda) /2 switch placed into the laser cavity at the Brewster angle avoiding reflection losses and as a (lambda) /4 switch with higher single pass losses due to Fresnel reflections. A higher laser output was obtained using (lambda) /2 switching. The obtained pulses had a halfwidth of 150…

Improvement of solid state Er:YAG pulse laser performance for use in medicine

1999

The large quadratic electro-optic effect of PLZT ceramics allows to design small size modulators for the solid state infrared Er:YAG laser (lasing at (lambda) equals 2.94 micrometers - the most pronounced absorption band of water), which has found application in medicine for efficient ablation of hard and soft tissues. In the free-running mode, the Er:YAG laser emits spikes that form the pulse envelope with duration of 150 - 800 microsecond(s) . An extracavity PLZT 8.5/65/35 ceramics modulator (aperture of 4 X 6 mm2 and length of 18 mm) was used to obtain (Pi) -shaped segments with the rise and decay times less than 5 microsecond(s) . That allows to reduce considerably the fraction of the p…

La motte médiévale de Drosnay (Marne) : résultats de deux sondages archéologiques

2011

Deux opérations de diagnostic réalisées en 2008 et 2009 ont permis de mettre au jour un segment du fossé d’enceinte d’une motte répertoriée depuis le XIXe s., ainsi que les restes d’un bâtiment en pierre sur sa partie sommitale. Le fossé a livré un mobilier dont la chronologie est centrée sur le XIIIe s. alors que le bâtiment n’est pas antérieur au XVe s. Les remaniements ayant affecté ce site sont nombreux. Dès le XVe s. d’importants travaux de remblaiement et de nivellement semblent modifier l’angle sud-ouest de la motte. Cependant, ce sont les terrassements contemporains qui ont irrémédiablement détruit la plus grande part des vestiges. Seule la basse-cour peut désormais conserver des ve…