Físico Matemáticas

El Sistema Financiero Mexicano, es el conjunto de organismos e instituciones que se encargan de administrar y dirigir a la inversión, el ahorro dentro del marco legal que corresponde en México. Algunos autores detallan aún mas sus actividades y lo definen como aquel que "…agrupa diversas instituciones u organismos interrelacionados que se caracterizan por realizar una o varias de las actividades tendientes a la captación, administración, regulación, orientación y canalización de los recursos económicos de origen nacional como internacional" (Ortega, 2002:65).

El propósito de este documento es diagnosticar dificultades en estudiantes de grado séptimo sobre el manejo del número fraccionario y sus operaciones básicas, e intervenir con alternativas para mejorar el ambiente de aula y el aprendizaje, mediante estrategias específicas de comunicación.

In the present work, the particleboards laminated with melamine formaldehyde and Polymer Faced Chipboard(PFC) paper were radiated with different dosages of electron radiations and its impact on the polymerization and other chemical properties were analyzed using characterization techniques such as TGA, DSC and XRD. It was observed that the amount of radiations have effect on the physical and thermal properties of the lamination. The knowledge from the present work will be used to develop new kind of coatings using melamine formaldehyde and PFC polymer and later on radiate it with the electron radiations to improve its thermal and mechanical properties.

We demonstrate the dual-wavelength quasi mode-locked operation of a passively mode-locked Er-doped fiber ring laser with twisted fiber in the cavity and a double-pass amplifier with a Faraday mirror. The configuration allows very strict control of the polarization. We observed synchronous dual-wavelength generation of noise-like pulses (NLP) with spectra centered at 1534 nm and 1562 nm. Rotation of the azimuth of the radiation propagating in the cavity caused a switching between the generation of NLPs and packets of pulses with typical solitons spectrum. In the latter regime, we observed partially synchronous sub-pulses at two different wavelengths.

• Spectral compression has a broad range of applications in optical communication. • Results show the spectrum was compressed by 8 times. • The pedestal and side bands were decreased more than 10 times. • Using imbalance polarization NOLM with twisted fiber is simple and easy method.

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

 We report a refractive index tip fiber optic sensor based on a modal interferometer coated with a thin copper film. This device can be used for solute concentration in aqueous mixture measurement. The copper film increases the device reflectivity and, as a result, increases the multimodal interference pattern visibility. To validate the sensor device, different water-glycerol weight concentrations were used in the range from 0 to 45 Glycerol %. The recorded spectral responses show a redshifting, and a sensitivity of 19 pm / (Glycerol % by weight) from 0 to 18 % and 4.7 pm / (Glycerol % by weight) from 18 to 45 % was achieved. Besides, using a phase analysis we calculated a sensitivity of -15 rad/RIU.

In this work, the experimental study of spectral broadening due to stimulated Raman scattering with respect to variation of input power of pulsed laser, as well as a 4 m length high-numerical aperture fiber with 100 and 500 m of non-zero dispersion-shifted fiber is reported. The results showed extreme broadening of spectrum which is known as supercontinuum generation, originated by self-phase modulation, four- wave mixing and dominated by cascaded stimulated Raman scattering. Supercontinuum spectrum achieved by total width of 850 nm and a remarkable flatness in the range of 1500 to 1600 nm. Furthermore, output spectrum showed a total of five Stokes waves. Numerical results are also presented.

• A wide wavelength-tunable passive mode locked with a SESAM is presented. • The tunability was experimentally achieved in the range of 1543.2-1569.5 nm. • The cavity includes a Sagnac interferometer-based fiber optical loop mirror (FOLM) as a wide wavelength-tunable filter.