New analysis and estimations of atmospheric attenuation at 100 GHz using meteorological data in Madrid

Atmospheric propagation at frequencies within the THz domain are deeply affected by the influence of the composition and phenomena of the troposphere. This paper is focused on the estimation of first order statistics of total attenuation under non-rainy conditions at 100 GHz. With this purpose, a yearly meteorological database from Madrid, including radiosoundings, SYNOP observations and co-site rain gauge, have been used in order to calculate attenuation due to atmospheric gases and clouds, as well as to introduce and evaluate a rain detection method. This method allows to filter out rain events and refine the statistics of total attenuation under the scenarios under study. It is expected that the behavior of the statistics would be closest to the ones obtained by experimental techniques under similar conditions.

Amplificador de potencia Clase F en banda L basado en tecnología GaN

This paper reports a high efficiency class-F power amplifier based on a gallium nitride high electron mobility transistor (GaN-HEMT), which is designed at the L band of 1640 MHz. The design is based on source and load pull measurements. During the design process, the parasitics of the package of the device are also taken into account in order to achieve the optimal class-F load condition at the intrinsic drain of the transistor. The fabricated class-F power amplifier achieved a maximum drain efficiency (DE) of 77.8% and a output power of 39.6 W on a bandwidth of 280 MHz. Simulation and measurement results have shown good agreement.

Low losses power distribution network at X band in stripline

An asymmetric stripline is proposed in this paper. The main aim of this line is to distribute the power among subarrays in an array with minimum losses. Several vertical transitions to subarrays are shown besides some network designs at X band for a square array for satellite communications.

Calibration process on the study of new antenna array architectures for space communications

This paper introduces novel calibration processes applied to antenna arrays with new architectures and technologies designed to improve the performance of traditional earth stations for satellite communications due to the increasing requirement of data capacity during last decades. Besides, the Radiation Group from the Technical University of Madrid has been working on the development of new antenna arrays based on novel architecture and technologies along many projects as a solution for the ground segment in the early future. Nowadays, the calibration process is an interesting and cutting edge research field in a period of expansion with a lot of work to do for calibration in transmission and also for reception of these novel antennas under development.

Sensor magneto-óptico de corriente con supresión de birrefringencia lineal mediante espejo de Faraday

Fiber optic sensors have some advantages in subjects related with electrical current and magnetic field measurement. In spite of the optical fiber utilization advantages we have to take into account undesirable effects, which are present in real non-ideal optical fibers. In telecommunication and sensor application fields the presence of inherent and induced birefringence is crucial. The presence of birefringence may cause an undesirable change in the polarization state. In order to compensate the linear birefringence a promising method has been chosen. This method employs orthogonal polarization conjugation in the back propagation direction of the light wave in the fiber. A study and a simulation of an experimental setup are realized with the advantage of a significant sensitivity improvement.

Caracterización de la impedancia de superficie para el cálculo del acoplo mutuo en un cilindro circular conductor cubierto por una dieléctrico multicapa

A novel formulation for the surface impedance characterization is introduced for the canonical problem of surface fields on a perfect electric conductor (PEC) circular cylinder with a dielectric coating due to a electric current source using the Uniform Theory of Diffraction (UTD) with an Impedance Boundary Condition (IBC). The approach is based on a TE/TM assumption of the surface fields from the original problem. Where this surface impedance fails, an optimization is performed to minimize the error in the SD Green's function between the original problem and the equivalent one with the IBC. This new approach requires small changes in the available UTD based solution with IBC to include the geodesic ray angle and length dependence in the surface impedance formulas. This asymptotic method, accurate for large separations between source and observer points, in combination with spectral domain (SD) Green's functions for multidielectric coatings leads to a new hybrid SD-UTD with IBC to calculate mutual coupling among microstrip patches on a multilayer dielectric-coated PEC circular cylinder. Results are compared with the eigenfunction solution in SD, where a very good agreement is met.

Implementación y configuración de un receptor de radio definido por software (SDR) para estudios de propagación

The constant development of digital systems in radio communications demands the adaptation of the current receiving equipment to the new technologies. In this context, a new Software Defined Radio based receiver is being implemented with the aim of carrying out different experiments to analyze the propagation of signals through the atmosphere from a satellite beacon. The receiver selected for this task is the PERSEUS SDR from the Italian company Microtelecom s.r.l. It is a software defined VLF-LF-MF-HF receiver based on an outstanding direct sampling digital architecture which features a 14 bit 80 MSamples/s analog-to-digital converter, a high-performance FPGA-based digital down-converter and a high-speed 480 Mbit/s USB2.0 PC interface. The main goal is to implement the related software and adapt the new receiver to the current working environment. In this paper, SDR technology guidelines are given and PERSEUS receiver digital signal processing is presented with the most remarkable results.

Estudio geotécnico para la cimentación del terraplén de acceso a un paso superior. Línea de alta velocidad Madrid-Castilla la Mancha-Comunidad Valenciana-Región de Murcia

Este proyecto aborda el estudio geotécnico para la cimentación del terraplén de acceso a un paso superior sobre el tramo Albatera-Elche, incluido en la Línea de Alta Velocidad Madrid-Castilla La Mancha-Comunidad Valenciana-Región de Murcia. Con el fin de identificar y clasificar los materiales del terreno de cimentación, se analiza el marco geológico regional y local del área de estudio. En el proyecto se presentan los resultados obtenidos en la campaña de reconocimiento de campo y en los ensayos realizados en laboratorio, a partir de los cuales se realiza la caracterización geotécnica de los materiales y se determinan sus parámetros geotécnicos. Asimismo, se considera la singular problemática geotécnica de la zona de estudio, por lo que se analiza la estabilidad global del terraplén, los tiempos de consolidación del terreno y se realiza una estimación de asientos. De acuerdo a todos los cálculos y consideraciones realizadas, se determinan los tratamientos de mejora y refuerzo del terreno de cimentación. Por último, se evalúan los costes derivados de la campaña de reconocimiento geotécnico y de la redacción del presente estudio. ABSTRACT This project is a geotechnical report for the foundation of the access embankment to an overpass in the railway section Albatera-Elche, included in the High Speed Rail line Madrid-Castilla La Mancha-Comunidad Valenciana-Región de Murcia. In order to identify and classify the foundation soil materials, the regional and local geological frame of the study area is analyzed. The results of the field survey and laboratory tests performed are displayed in the project, from which the geotechnical characterization of materials is made and geotechnical parameters have been determined. It is also considered the special geotechnical problems in the study area, so the overall stability of the embankment and ground consolidation times are analyzed, as well as an estimate of ground settlement is also made. According to all calculations and considerations made, treatments to improve and strengthen the foundation soil are determined. Finally, the costs of the geotechnical campaign and the elaboration of this report are evaluated.

Sermon panegirico de la natividad de San Juan Bautista [Texto impreso]

Hay un ejemplar encuadernado con: Sermon de la Assumpcion de Maria SSma. y de su Imagen milagrosa, venerada en la ... villa de Elche, que en su fiesta y dia 15 de Agosto del año 1755 (NP24-25/75).

Exercicios de la corona de Maria Santisima... [Texto impreso] : añadidos en la segunda impresion...

Sign. : A-H12

La voz femenina: Número 1 Año I - 1 mayo 1912

Microfilme. Alicante: Caja de Ahorros de Alicante y Murcia, ca. 1990

The crystal structure of modified bovine fibrinogen

Here we report the crystal structure at ≈4-Å resolution of a selectively proteolyzed bovine fibrinogen. This key component in hemostasis is an elongated 340-kDa glycoprotein in the plasma that upon activation by thrombin self-assembles to form the fibrin clot. The crystals are unusual because they are made up of end-to-end bonded molecules that form flexible filaments. We have visualized the entire coiled-coil region of the molecule, which has a planar sigmoidal shape. The primary polymerization receptor pockets at the ends of the molecule face the same way throughout the end-to-end bonded filaments, and based on this conformation, we have developed an improved model of the two-stranded protofibril that is the basic building block in fibrin. Near the middle of the coiled-coil region, the plasmin-sensitive segment is a hinge about which the molecule adopts different conformations. This segment also includes the boundary between the three- and four-stranded portions of the coiled coil, indicating the location on the backbone that anchors the extended flexible Aα arm. We suggest that a flexible branch point in the molecule may help accommodate variability in the structure of the fibrin clot.