Self-Referenced Multifrequency Phase-Resolved Luminescence Spectroscopy

Phase-resolved luminescence chemical sensors provide the analyte determination based on the estimation of the luminescence lifetime. The lifetime is estimated from an analysis of the amplitudes and/or phases of the excitation and emission signals at one or several modulation frequencies. This requires recording both the excitation signal (used to modulate the light source) and the emission signal (obtained from an optical transducer illuminated by the luminescent sensing phase). The excitation signal is conventionally used as reference, in order to obtain the modulation factor (the ratio between the emission and the excitation amplitudes) and/or the phase shift (the difference between the emission and the excitation phases) at each modulation frequency, which are used to estimate the luminescence lifetime. In this manuscript, we propose a new method providing the luminescence lifetimes (based either on amplitudes or phases) using only the emission signal (i.e., omitting the excitation signal in the procedure). We demonstrate that the luminescence lifetime can be derived from the emission signal when it contains at least two harmonics, because in this case the amplitude and phase of one of the harmonics can be used as reference. We present the theoretical formulation as well as an example of application to an oxygen measuring system. The proposed self-referenced lifetime estimation provides two practical advantages for luminescence chemical sensors. On one hand, it simplifies the instrument architecture, since only one analog-to-digital converter (for the emission signal) is necessary. On the other hand, the self-referenced estimation of the lifetime improves the robustness against degradation of the sensing phase or variations in the optical coupling, which reduces the recalibration requirements when the lifetimes are based on amplitudes.Spanish Ministry of Economy, Industry and Competitiveness CTQ2017-88079-P CTQ2014-53442-P BES-2009-026919Spanish Ministry of Economy, Industry and Competitiveness (Torres Quevedo Grants) PTQ-15-07922 PTQ-15-07912CEI BioTic Granada Campus CEIbioTIC14-201

Latest discrete symmetries and Quantum Mechanics studies with KLOE-2

This work develops a methodology for estimating risk of wind-borne introduction of flying insects into a country, identifying areas and periods of high risk of vector-borne diseases incursion. This risk can be characterized by the role of suitable temperatures and wind currents in small insects' survival and movements, respectively. The model predicts the number density of introduced insects over space and time based on three processes: the advection due to wind currents, the deposition on the ground and the survival due to climatic conditions. Spanish livestock has suffered many bluetongue outbreaks since 2004 and numerous experts point to Culicoides transported by wind from affected areas in North Africa as a possible cause. This work implements numerical experiments simulating the introduction of Culicoides in 2004. The model identified southern and eastern Spain, particularly between June and November, as being at greatest risk of wind-borne Culicoides introduction, which matches field data on bluetongue outbreaks in Spain this year. This validation suggests that this model may be useful for predicting introduction of airborne pathogens of significance to animal productivity

Fachada del Colegio Mayor de San Ildefonso (Alcalá de Henares). Éxito de crítica y público

La recuperación de la fachada renacentista del Colegio Mayor de San Ildefonso ha merecido galardones como el de la fundación de casas históricas y singulares o el prestigioso premio Europa Nostra 2018. Los artífices nos relatan sus problemas de origen y las soluciones adoptadas

CARACTERIZACIÓN OLFATOMÉTRICA Y SENSORIAL DE LOS COMPUESTOS RESPONSABLES DE AROMA EN EL LICOR DE MANZANA DE TENANGO DEL VALLE, ESTADO DE MÉXICO

En contraste, otros licores son menos conocidos al exterior, pero al interior de las comunidades donde se producen, son parte importante no sólo de la actividad económica, sino también de la identificación social y cultural de los habitantes por su comunidad. Además, son elaborados de manera artesanal, lo que hace que tengan un valor agregado al ser diferentes a aquéllos que se encuentran disponibles en el mercado, siendo así un atractivo para los visitantes. El mismo trabajo, evidenció que, específicamente en el municipio de Tenango del Valle, se produce un licor de manzana desde 1907 siguiendo una receta familiar. Se trata de una labor familiar pero que también genera empleo en la comunidad donde se elaboran. Los involucrados se encargan desde reunir las manzanas de los cerros locales hasta que el producto final se deposita para ser añejado dentro de barricas de roble blanco. Con respecto a este punto, algunas de las barricas usadas en este proceso provienen del estado de Zacatecas y otras, según reportó la familia productora, de la antigua fábrica del refresco de manzana que existió en la ciudad de Toluca. Las barricas que se usaron en 1907 son las mismas que se utilizan actualmente. Las barricas se reparan con un mes de anticipación al inicio de la producción: se llenan de agua para que la madera se hinche, se lavan con agua y asiento del vinagre de manzana al que llaman “madre”. Para finalizar con la reparación, se utiliza martillo y un cincel especial para ajustarlas y las posibles fisuras se tapan con brea o cera de cebo.En el trabajo de campo del proyecto de investigación “Estudio sobre la aceptación y preferencia de licores de naranja artesanales producidos en el Valle de Toluca” – PROMEP FE19/2009(103.5/09/4195), se detectó que entre los licores de fruta, aquél de naranja del municipio de Toluca se produce de manera semi-industrial y es uno de los más conocidos dentro y fuera del mismo vall

Método de extracción de modelos circuitales de dispositivos encapsulados de microondas

This work is the result of the investigations in the modelling of microwave packaged devices made by our group. A robust and accurate-straightforward electrical small signal modelling technique for radiofrequency and microwave packaged devices, is shown. This method called DICOMPAK is based on previous works made by us, and can be used for the electrical modelling of two types of packaged devices: ceramic packaged devices and low cost plastic encapsulated devices. The technique employs analytically derived expressions and it is based on analysis of the measured scattering parameters over an adequate frequency range. Very good agreement is shown between measured and simulated scattering parameters for different ceramic and plastic packaged devices from several foundries

Characterization of the teaching formation of Basic General Physicians.

Se realizó una investigación educacional descriptiva   de carácter cualitativo con el objetivo de caracterizar epistemológicamente el estado actual de la formación docente del Médico General Básico, mediante talleres a especialistas y alumnos ayudantes de la carrera de medicina en la filial de Ciencias Médicas de Bayamo, en el periodo de septiembre a diciembre del 2010. El 100% de los participantes coincidieron en que la formación pedagógica es insuficiente y no tiene un papel importante en el curriculum actual para la formación del profesional de la salud, desvalorizando los beneficios que aportaría  para la formación profesional, el paciente y la sociedad.It was performed  a qualitative, descriptive and educational research with the objective to characterize epistemologically the present state of the basic general physician training by means of workshop for specialists and assistant students of medicine career in the filial of Medical Sciences, Bayamo since September to December 2010. The 100% of the participants agreed that the pedagogical training was inadequate and it doesn't have an important role in the present curriculum for the health professional training, devaluing the benefits that would contribute to the professional training, the patient and society

Modelado electro-óptico de transistores MESFET y P-HEMT en SPICE

As an enhancement of our previous works in the electrical modelling of microwave and optical-microwave interaction field, this paper shows the result of the research on large signal behaviour (DC I/V curves) of AlGaAs P-HEMT (pseudomorphic high electron mobility transistor) and MESFET devices, in the overall I/V plane, when the incident optical input power is changed and how is possible to include the model into the PSPICE simulator. Experimental results show very good agreement with the theoretical analysis

Circuito conversor de analizadores de espectro de bajo coste en analizadores de redes escalares

An ultra-low cost and high performance RF scalar network analyzer for research and educational purposes have been developed. This device is based on a low cost Schottky “zero-bias” sensor diode connected to a microstrip directional coupler to measure the reflection port and a basic spectrum analyzer with tracking generator to measure the transmission port. A high impedance video output has been added to the detector circuitry in order to make compatible this device with the usual circuitry available in a basic RF laboratory (multimeter and an educational spectrum analyzer). The able to measure the magnitude of S11 and S21 scattering parameters coupled with the ultra-low cost of the circuitry, makes this system interesting tool to use by users at any level