Search results for "Generation"
showing 10 items of 3050 documents
High frequency lasing device by HHG
2013
High frequency lasing device by HHG
The table top high frequency lasing device
2015
Atomic and molecular systems, subjected to intense laser pulse, emit typical High-Order Armonic Generation (HHG) spectra. This work aims to investigate the possibility to obtain a laser device by HHG. At this end, we analyzed the emission spectra by a molecular ion driven by a linearly polarized laser field. The temporal behaviour is obtained using the Morlet wavelets transform of emission. The results show that, after filtration of the electromagnetic radiation emitted, it is possible to select a frequency which seems to have almost constant intensity and phase. This characteristic makes possible that HHG from a molecule can be used as high frequency laser fields.
Properties of the radiation Emitted by a Laser driven quantum Ring
2015
We present the electromagnetic emission from one electron confined in a quantum ring driven by an intense laser field. We consider both a plain ring and one structured by six potential wells that produce a static tangential force. Through a suitable one-dimensional model we numerically solve the associated Schroedinger equation obtaining the correspondent time evolution of the wave-function. We show that the emission is formed by a wide plateau that can be both quasi-continuum or resolved in discrete lines. We study the dependence of the emitted spectra from the polarization status of the external laser field and in particular we concentrate on the intensity of the emitted lines and of thei…
Quantum ring: HHG spectrum control
2015
Atoms, molecules , clusters and other systems driven by a strong laser field of frequency \omega_L can emit a spectrum of laser harmonics. The high harmonics generation (HHG) phenomen is strongly affected by the symmetries of the system. It is well known that systems with rotational symmetries emit only odd harmonics. Numerous researcher make mainly attention to the possibilities to set different initial conditions in order to control the spectrum. Recently, the study of nanotechnology is hot-topics and in particular the study of very symmetric systems such as fullerene, nanoring and structured nanoring (nanoring with identical and symmetric scattering centers). Therefore, it is natural and…
Study of the Effects of Nuclear Motion on High Harmonic Generation in Simple Molecules
2010
Harmonic emission at microwave frequencies in Ba0.6K0.4BiO3 crystals
1998
Abstract Nonlinear microwave emission by Ba0.6K0.4BiO3 crystals is investigated. Second- and third-harmonic signals are studied as a function of the temperature and the applied magnetic field at different values of the input power level. The experimental data are discussed in the framework of models previously reported in the literature. We show that there are several mechanisms responsible for harmonic emission in Ba0.6K0.4BiO3 crystals: they play a different role depending on the temperature and the intensity of the applied field. We suggest that harmonic emission at temperatures far from Tc is due to nonlinear processes in weak links or flux motion, while nonlinearity near Tc is ascribab…
How bilastine is used to treat allergic rhinitis and urticaria in children
2021
Management guidelines for allergic rhinitis and urticaria recommend oral second-generation antihistamines as first-line treatment. The efficacy and safety of bilastine, the newest nonsedating second-generation antihistamine, are well established in adolescents/adults with these allergic conditions. The bilastine development program for pediatric use (2–<12 years) followed EMA-authorized processes. Pharmacokinetic/pharmacodynamic simulation and modeling and a pharmacokinetic study were conducted to identify and confirm the pediatric dose (10 mg/day). A Phase III, multicenter, double-blind, randomized, placebo-controlled, parallel-group study was performed to confirm the safety of bilasti…
Bioactive and biodegradable silica biomaterial for bone regeneration.
2014
Biosilica, a biocompatible, natural inorganic polymer that is formed by an enzymatic, silicatein-mediated reaction in siliceous sponges to build up their inorganic skeleton, has been shown to be morphogenetically active and to induce mineralization of human osteoblast-like cells (SaOS-2) in vitro. In the present study, we prepared beads (microspheres) by encapsulation of β-tricalcium phosphate [β-TCP], either alone (control) or supplemented with silica or silicatein, into the biodegradable copolymer poly(d,l-lactide-co-glycolide) [PLGA]. Under the conditions used, ≈5% β-TCP, ≈9% silica, and 0.32μg/mg of silicatein were entrapped into the PLGA microspheres (diameter≈800μm). Determination of …
Career Paths in Institutional Business Elites: Finnish Family Firms from 1762–2010
2015
This article analyzes the career paths of family business executives in institutional business elites in Finland using an empirical database based on a Bourdieusian prosopographical approach. The results indicate that career paths became more complex but shortened in length toward the beginning of the twenty-first century. The early career paths of family executives changed from positions as assistants and salesmen in the eighteenth and nineteenth centuries to governance, chief executive officer (CEO), and management positions in the twentieth and twenty-first centuries. Compared with the founder generation, next-generation family members benefited from more rapid institutional business eli…
La educación para la promoción de los derechos humanos de la tercera generación
2008
The paper deals with the ways to promote the third generation human rights through education. It underlines the evolutionary dynamism of human rights and the necessity to promote a culture based on their recognition. Solidarity is analysed as the value which specify this generation of rights. Then the author defends the rights to a healthy environment, to peoples’ development, and to peace, as key components of any international political community or local communities aiming to meet the requirements of human dignity. Finally, he proposes some pedagogical practices to help the students to become conscious and responsible citizens, so they have the competence to ask to individuals and groups…