Low current performance of the Bern medical cyclotron down to the pA range

A medical cyclotron accelerating H- ions to 18 MeV is in operation at the Bern University Hospital (Inselspital). It is the commercial IBA 18/18 cyclotron equipped with a specifically conceived 6 m long external beam line ending in a separate bunker. This feature is unique for a hospital-based facility and makes it possible to conduct routine radioisotope production for PET diagnostics in parallel with multidisciplinary research activities, among which are novel particle detectors, radiation biophysics, radioprotection, radiochemistry and radiopharmacy developments. Several of these activities, such as radiobiology experiments for example, require low current beams down to the pA range, while medical cyclotrons are designed for high current operation above 10 μA. In this paper, we present the first results on the low current performance of a PET medical cyclotron obtained by ion source, radio-frequency and main coil tuning. With this method, stable beam currents down to (1.5+/- 0.5 ) pA were obtained and measured with a high-sensitivity Faraday cup located at the end of the beam transport line.

Optimum Design of an Envelope Tracking Buck Converter for RF PA using GaN HEMTs

In this paper, filter design methodology and application of GaN HEMTs for high efficiency Envelope Amplifier in RF transmitters are proposed. The main objectives of the filter design are generation of the envelope reference with the minimum possible distortion and high efficiency of the amplifier obtained by the optimum trade-off between conduction and switching losses. This optimum point was determined using power losses model for synchronous buck with sinusoidal output voltage and experimental results showed good correspondence with the model and verified the proposed methodology. On the other hand, comparing to Si MOSFETs, GaN HEMTs can provide higher efficiency of the envelope amplifier, due to superior conductivity and switching characteristics. Experimental results verified benefits of GaN devices comparing to the appliance of Si switching devices with very good Figure Of Merit, for this particular application

Octauas en que se descriue la solemne festiua proclamacion, que hizo la M.N. y M.L. Villa de Bilbao a la exaltacion al trono de su augusto catholico monarca D. Fernando VI / dispuestas, por vn afecto reuerente hijo, y vezino de dicha Villa.

Apostillas marginales

An Interleaved EPE-Immune PA-DPL Structure for Resisting Concentrated EM Side Channel Attacks on FPGA Implementation

Early propagation effect (EPE) is a critical problem in conventional dual-rail logic implementations against Side Channel Attacks (SCAs). Among previous EPE-resistant architectures, PA-DPL logic offers EPE-free capability at relatively low cost. However, its separate dual core structure is a weakness when facing concentrated EM attacks where a tiny EM probe can be precisely positioned closer to one of the two cores. In this paper, we present an PA-DPL dual-core interleaved structure to strengthen resistance against sophisticated EM attacks on Xilinx FPGA implementations. The main merit of the proposed structure is that every two routing in each signal pair are kept identical even the dual cores are interleaved together. By minimizing the distance between the complementary routings and instances of both cores, even the concentrated EM measurement cannot easily distinguish the minor EM field unbalance. In PA- DPL, EPE is avoided by compressing the evaluation phase to a small portion of the clock period, therefore, the speed is inevitably limited. Regarding this, we made an improvement to extend the duty cycle of evaluation phase to more than 40 percent, yielding a larger maximum working frequency. The detailed design flow is also presented. We validate the security improvement against EM attack by implementing a simplified AES co-processor in Virtex-5 FPGA.

Mi sueño y mi visión verificados en la venida de nuestro augusto monarca Fernando VII

Tít. tomado de principio de texto

Á la estatua erigida por la ciudad de Valencia en honor de su augusto soberano Fernando VII : y en memoria del dia 23 de mayo del año 1808 : odas

Hay un ejemplar encuadernado con: Excelencias y admirables frutos del agua bendita sacados del capítulo 31, de la vida de la esclarezida Virgen Santa Teresa de Jesus ... del angelico ... Santo Thomas ; del glorioso P. San Vicente Ferrer ... (XVIII/1682).

Triunfo del amor y respeto con que la muy ilustre y fidelissima ciudad de Orihuela celebrô la exaltacion al trono de Su Augusto y muy amado monarca Carlos Tercero de España en los dias 14. 15. y 16. de octubre de 1759 y con la mas rendida veneracion consagra a sus Reales Plantas

Fecha de 1760 tomada de las licencias

Prospecto y anuncio de una Galeria q[u]e debe formarse en la Plaza de la Constitucion de la Ciudad de Valencia [Manuscrito] : decorada con las Estatuas de los Doce Padres de la Patria, q[u]e ... tiene esta Provincia el honor de embiar es calidad de sus Representantes al augusto Congreso Nacional de 1820

Alcance y contenido: Copia ms. del documento que se posiblemente se envío al Congreso Nacional. Los nombres de los valencianos ilustres son: D. Joaquín Lorenzo Villanueva y Astengo, D. Mariano Liñán, D. Vicente Sancho, D. Francisco Ciscar, D. José Rovira, D. Simón de Roxas, D. Antonio Bernabeu, D. Felipe Benicio Navarro, D. Vicente Tomás Traver, D. Antonio Verdú, D. Nicolás Gareli y D. Gregorio Gisbert. Junto a los nombres, hay una breve nota biográfica y los atributos que acompañarán a las estatuas, todos relacionados con las profesiones de todos ellos.

Festiva relacion de las magnificas fiestas que celebra la... ciudad de Valencia, en la feliz Proclamacion de nuestro Catholico Augusto Monarca D. Carlos IV... [Texto impreso]

Hay un ejemplar encuadernado con el volumen facticio XVIII/2000

En la celebridad del augusto sacramento del altar, y restauracion a su trono de nuestro amado monarca Don Fernando Septimo en el año MDCCCXIV Valencia en los siguientes versos [Texto impreso]

Versos para arrojar por las calles de Valencia en la fiesta del Corpus

Declaracion parafrastica de las vistosas Alegorias con que el Gremio de Cortantes solemniza la Proclamacion de nuestro Augusto Monarca Carlos IV [Texto impreso] : Endecasilabos

Hay un ejemplar encuadernado con: Las fiestas de Valencia XVIII/4276

La Traca [Texto impreso] : semanari pa la gent de tro

Recurso electrónico. Valencia: BVNP, 2014

La Traca : semanari pa la gent de tro: Año I Número 1 - 15 noviembre 1884

Recurso electrónico. Valencia: BVNP, 2014

La Traca : semanari pa la gent de tro: Año I Número 2 - 22 noviembre 1884

Recurso electrónico. Valencia: BVNP, 2014