This document presents the design and manufacture of a reflectarray (RA) antenna for the Ku-band that is based on a fully-metallic 3D architecture. The reflectarray unit cell is formed by a square-shaped waveguide section ending in a short circuit, which is the reflectarray back ground plane. Each cell has the ability of configuring the phase of its own reflected field by means of resonators perforated on the walls of the cell waveguide section. The resonator-based waveguide cell introduces the 3D character to the design. The geometry of the resonators and the size variation introduces the phase behavior of each cell, thus, conforming the radiation pattern of the reflectarray. This design explores the potential of phase value truncation (six states and two states) and demonstrates that proper pattern results can be obtained with this phase truncation.

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INTRODUCCION. Desde comienzos de este siglo se usa la palabra "nefrosis" que ha motivado mimerosos estudios, los que han servido para clarificar conceptos de la fisiopatologia renal (13). La idea de una sola enfermedad degenerativa se transformo con los anos en el "sindrome nefrotico" de mas amplio significado clinico.Estamos todavia lejos de conocer la historia natural de este sindrome (1) que incluye enfermedades diferentes en el adulto (19) que en el niiio y en este se presenta tambien en diversas formas: el sindrome nefrotico familiar y del recien nacido (11) que sugieren un trastorno genetico o de conflicto inrmmologico feto-materno; el sindrome nefrotico idiopatico del preescolar y secundario del nino mayor que se acerca a los problemas del adulto.El sindrome nefrotico primitive, que hasta hace pocos anos se limitaba en la nefrosis lipoidea, se encuentra hoy entre las alteraciones glomerulares que adoptan formas muy variadas (6). En este sentido ha significado un progreso indudable el estudio histologico renal a traves de la biopsia renal percutanea (5,6,9, 17,19,20).No se ha logrado, sin embargo, relacionar en forma exacta la histologia del proceso con el resultado del tratamiento esteroidal y por lo tanto, con el pron6stico; Churg (6) describe una concordancia muy completa en enfemios estudiados histol6gicamente que llevaban una evolution corta y que no habian recibido tratamiento; pero otras experiencias no son tan felices (17) y la sensibilidad a los corticoides en las lesiones minimas fueron alrededor del 60%.En la literarura pediatrica nacional (14, 16, 17) hay investigaciones de varios grupos que bus-* Servicio de Pedialria, Hospital E. Gon/alez Cortes. ** Departamento dc Anatomia Patol6gica. Univcrsidad Cat6!ica de Chile.caron la correlacion ana"tomo-clinica y sin duda contribuiran a clasificar nuestros enfermos de acuerdo con las normas internacionales. Esperamos un gran progreso en el conocmriento de esta enfermedad con el apoyo de la microscopia electronica, inmunoelectroforesis, inmunofluorescencia y del uso de drogas citotoxicas e inmunodepresoras (3,10,15,18).Nos parecio que el estudio de maestro material que correlaciona la histologja por microscopic de luz, con el resultado del tratamiento esteroidal, era indispensable para poder dar los proximos pasos.MATERIAL Y M£TODO. Desde el ano 1969, en el Hospital E. Gonzalez Cortes, se controlaron los enfermos nefrouro!6gicos por un grupo de me'dicos que atienden tanto la consulta externa como las normas de tratamiento y evolucion intrahospitalaria.Se hizo un plan prospective para el estudio de los sindromes nefr6ticos que incluye un criterio de diagnostico y un tratamiento uniforme asi como el control posterior de laboratorio. Se incorporan a esta investigacion los ninos enfermos que asistian en 1969 y se agregan los que concurren por primera vez en los ultimos cuatro anos.La historia, examen fisico y evolucion clinica, se llevan en una ficha previamente analizada; la biopsia renal percutanea se realiza en todos los enfermos de acuerdo a la tecnica...

The in-line monitoring of liquid properties, such as density and viscosity, is a key process in many industrial areas such as agro-food, automotive or biotechnology, requiring real-time automation, low-cost and miniaturization, while maintaining a level of accuracy and resolution comparable to benchtop instruments. In this paper, 3D-printed cuboid-shaped liquid cells featuring a rectangular vibrating plate in one of the sides, actuated by PZT piezoelectric layers, were designed, fabricated and tested. The device was resonantly excited in the 3rd-order roof tile-shaped vibration mode of the plate and validated as a density-viscosity sensor. Furthermore, conditioning circuits were designed to adapt the impedance of the resonator and to cancel parasitic effects. This allowed us to implement a phase-locked loop-based oscillator circuit whose oscillation frequency and voltage amplitude could be calibrated against density and viscosity of the liquid flowing through the cell. To demonstrate the performance, the sensor was calibrated with a set of artificial model solutions of grape must, representing stages of a wine fermentation process. Our results demonstrate the high potential of the low-cost sensor to detect the decrease in sugar and the increase in ethanol concentrations during a grape must fermentation, with a resolution of 10 µg/mL and 3 µPa·s as upper limits for the density and viscosity, respectively.

This document presents the design and manufacture of a reflectarray (RA) antenna for the Ku-band, based on a fully-metallic 3D architecture. The reflectarray unit cell is formed by a square-shaped waveguide section ended in a short circuit, that is the reflectarray back ground plane. Each cell has the ability of configuring the phase of its own reflected field by means of resonators perforated on the walls of the cell waveguide section. The resonator-based waveguide cell introduces the 3D character to the design. The geometry of the resonators and its size variation introduces the phase behaviour of each cell, conforming the radiation pattern of the reflectarray. This design explores the potential of phase value truncation (6 states and 2 states), and demonstrates that proper pattern results can be obtained with this phase truncation.