969 research outputs found
Optical realization of nonlinear quantum dynamics
In a cavity filled with a Kerr medium it is possible to generate the
superposition of coherent states, i.e. Schroodinger cat states may be realized
in this system. We show that such a medium may be mimicked by the propagation
of a conveniently shaped Gaussian beam in a GRIN device. This is attained by
introducing a second order correction to the paraxial propagation of the beam.
An additional result is that a Gaussian beam propagating in GRIN media, may
split into two Gaussian beams
Diseño de una propuesta metodológica para interpretar el huerto habitacional en un årea del Valle del Cauca
En el municipio de AlcalĂĄ, cuenca rĂo La Vieja, norte del Valle, se diseñó una propuesta para abordar la problemĂĄtica del sistema finca con el fin de propiciar metodologĂas de investigaciĂłn que integren a las comunidades rurales, organizaciones de la sociedad civil, ONGâS y entidades gubernamentales La informaciĂłn de seisfincas se organizĂł en cuatro dĂ©cadas desde 1960 para estudiar las relaciones decompetencia, colaboraciĂłn, interacciones y la asignaciĂłn de la superficie total adiversas funciones. La propuesta permitiĂł identificar las fluctuaciones de las poblaciones de animales domĂ©sticos y se estableciĂł relaciones con los procesos de transformaciĂłn agrĂcola de las fincas.In the municipality of AlcalĂĄ, basin of river La Vieja, north of Valle (Department), a proposal was designed to approach the problem of farm systems. The purpose of this proposal was to facilitate investigation methodologies that integrate rural communities, social organizations, NGOÂŽs and government entities. In order to study the relationships of competition, collaboration, interactions and the assignment of the total surface to diverse functions, information of six farms was organized in four decades (from 1960 â 2002). This proposal allowed the identification of population fluctuations of domestic animals and sets relationships with the processes of agricultural transformation within
the farm
Response to âComment on `Bandgap and effective mass determination of epitaxial cadmium oxide'â [Appl. Phys. Lett. 92, 106103 (2008)]
Bandgap and effective mass of epitaxial cadmium oxide
The bandgap and band-edge effective mass of single crystal cadmium oxide, epitaxially grown by metal-organic vapor-phase epitaxy, are determined from infrared reflectivity, ultraviolet/visible absorption, and Hall effect measurements. Analysis and simulation of the optical data, including effects of band nonparabolicity, Moss-Burstein band filling and bandgap renormalization, reveal room temperature bandgap and band-edge effective mass values of 2.16±0.02 eV and 0.21±0.01m0 respectively
Faceting and structural anisotropy of nanopatterned CdO(110) layers
CdO(110) layers with a self-organized surface structure have been grown on (10math0) sapphire (m plane) substrates by metal-organic vapor phase epitaxy. The epitaxial relationships between layer and substrate have been determined and a crystallographic model that accounts for the CdO in-plane orientation, which results in a reduced lattice mismatch when the CdO[001] direction is perpendicular to the sapphire c axis, has been proposed. Although the measured lattice parameters indicate that the layers are almost fully relaxed, an anisotropic mosaicity is detected with symmetrical rocking curves attaining minimum values when measured along the CdO[math10] direction. The layer morphology consists of a regular ridge-and-valley structure which defines, again, a preferential in-plane direction. The grooves run parallel to the CdO[001] axis and exhibit lateral surfaces sloped at 28° with respect to the (110) surface. The influence of growth temperature and VIâII molar ratio on the anisotropic mosaicity and morphology has been [email protected] [email protected] [email protected]
Efeito da adição de farelo de soja e farelo de trigo na fermentação semi-sĂłlida em bagaço de cana-de-açĂșcar para produção de celulases por Aspergillus niger.
ZnO growth by MOCVD: numerical study
EnIII−V compound device fabrication is facing today challenging issues typically related to high volume manufacturing such as process reliability, process consistency, cost−reduction. Each step of the overall device manufacturing process must be carefully analysed and replicated to obtain reproducible device structures.
Purifiers are commonly used in MOVPE processes and are becoming standard equipment in both research and production environments. In most cases implementation of gas purification strategies is enabling to achieve ultimate product purity and process reproducibility by defect and contamination control. In addition, an appropriate gas purification strategy is effective in high value component/chemicals protection (e.g. high purity MO sources), and as an assurance against line contamination due to human error or component failure.
Purifier operating conditions can vary noticeably and a knowledge of which parameters can affect ultimate gas purity should be of interest to MOVPE operators to master gas distribution line contamination issues. Expertise on such parameters and their effect is essential to obtain a reliable product and sub−ppb contamination control throughout the purifier's lifetime and not only in spot demonstrations
Aplicação de biorreator em colunas instrumentado em escala laboratorial para produção de celulases a partir do bagaço de cana-de-açĂșcar.
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