Asesoramiento psicoeducativo en el ámbito sociolaboral

p. 163-171En este trabajo se analizan los focos nucleares de la aplicación del Asesoramiento Psicoeducativo en el ámbito laboral. Por una parte, el énfasis en las competencias de búsqueda y mantenimiento del empleo. Se reflexiona también sobre las técnicas e instrumentos de evaluación, así como de estrategias de intervención psicoeducativa, en personas de diferentes edades desde el ámbito sociolaboral, así como de variables contextuales y sociales moduladorasS

Search of dark-matter axions in the microwave frequency range with full-wave modal techniques

Axions, originally proposed to solve the strong Charge-Parity problem of Quantum Chromo-Dynamics theory, emerge now as leading candidates of dark matter. In fact, the search of dark-matter axions in the microwave frequency range has been developed by different research groups during the last twenty years. In this demanding scenario, several microwave passive components (haloscopes) have been designed and fabricated for such axions detection based on the use of cavities and multi-cavities. From an electromagnetic point of view, comercial software (ANSFT HFSS, CST MICROWAVE STUDIO, etc ) has been employed for the design of different kind of haloscopes. In this work we propose to use the BI-RME 3D method (Boundary Integral – Resonant Mode Expansion) as an alternative to analyze the axion-photon coupling existing within an haloscope. This full-wave modal technique has provided interesting wide-band results for the design of new haloscopes

Analysis and implementation of different topologies of transversal filters in planar technology

This paper uses a simple configuration to implement microwave transversal filters based on microstrip technology. The structure is of second order and implements two transmission zeros and two reflection zeros in the frequency response of the filter. The basic configuration consists of input and output ports coupled in a shunt configuration to two printed resonators of different lengths. A modification of the original structure is introduced to allow an additional direct coupling between the source and the load. Depending on the value and the sign of the coupling terms, different frequency responses can be obtained. In this way, small modifications in the basic structure allow to obtain band-pass or band-stop responses. Following this circuit topology, the paper discusses the possibilities to have transmission zeros in the real or in the complex plane and their effects on the frequency response and on the group delay of the filter. Also, two practical implementations in microstrip technology are proposed, and a third filter implementing group delay equalization is demonstrated. Measured results confirm theoretical predictions and validate the structures for practical applications.Ministerio de Educación y Ciencia, Ref. TEC2007-67630-C03-02. Fundación Séneca, Ref. 08833/PI/0

Dispersión de objetos 2D dieléctricos y magnéticos usando bases wavelet

Lossy dielectric and magnetic obstacles are typically present in many high-frequency scattering applications. In this paper, we study this problem using the Equivalence Principle and the Method of Moments (MoM). When the structure is complex and high accuracy is required, the number of unknowns in the numerical solution naturally grows. Therefore, we propose the use of wavelet-like bases to improve the numerical efficiency and memory requirements. For verification purposes, the results provided by the new technique are successfully compared with those obtained with the conventional MoM approach. The new technique has been applied to characterize the scattering behavior of large square and elliptical obstacles, as well as multilayer structures, which are composed of lossy homogeneous media and conductors.Este trabajo ha sido financiado por el Ministerio de Educación y Ciencia, bajo los proyectos de investigación TEC2004/04313-C02-01, TEC2004/04313-C02-02, y el proyecto de la fundación Séneca PB/4/FS/02

Evaluation of time domain electromagnetic fields radiated by constant velocity moving particles traveling along an arbitrarily shaped cross-section waveguide using frequency domain Green's functions

A technique for the accurate computation of the time domain electromagnetic fields radiated by a charged distribution traveling along an arbitrarily shaped waveguide region is presented. Based on the transformation (by means of the standard Fourier analysis) of the time-varying current density of the analyzed problem to the frequency domain, the resulting equivalent current is further convolved with the dyadic electric and magnetic Green's functions. Moreover, we show that only the evaluation of the transverse magnetic modes of the structure is required for the calculation of fields radiated by particles traveling in the axial direction. Finally, frequency domain electric and magnetic fields are transformed back to the time domain, just obtaining the total fields radiated by the charged distribution. Furthermore, we present a method for the computation of the wakefields of arbitrary cross-section uniform waveguides from the resulting field expressions. Several examples of charged particles moving in the axial direction of such waveguides are included.The authors would like to thank ESA/ESTEC for having cofunded this research activity through the Network Partnering Initiative program and through the project "Multipactor Analysis in Planar Transmission Lines" (contract 20841/08/NL/GLC). We also are grateful to the Spanish government and the local Council of Murcia for their support through the projects CICYT Ref. TEC2010-21520-C04-04 and SENECA Ref. 08833/PI/08, respectively.Jimenez Nogales, M.; Marini, S.; Gimeno Martinez, B.; Alvarez Melcon, A.; Quesada Pereira, FD.; Boria Esbert, VE.; Soto Pacheco, P.... (2012). Evaluation of time domain electromagnetic fields radiated by constant velocity moving particles traveling along an arbitrarily shaped cross-section waveguide using frequency domain Green's functions. Radio Science. 47(5):1-14. https://doi.org/10.1029/2012RS005008S114475Alvarez-Melcon, A., & Mosig, J. R. (2000). Two techniques for the efficient numerical calculation of the Green’s functions for planar shielded circuits and antennas. IEEE Transactions on Microwave Theory and Techniques, 48(9), 1492-1504. doi:10.1109/22.869000Bane, K. L. F., Wilson, P. B., & Weiland, T. (1985). Wake fields and wake field acceleration. AIP Conference Proceedings. doi:10.1063/1.35182Bozzi, M., Perregrini, L., Alvarez Melcon, A., Guglielmi, M., & Conciauro, G. (2001). MoM/BI-RME analysis of boxed MMICs with arbitrarily shaped metallizations. IEEE Transactions on Microwave Theory and Techniques, 49(12), 2227-2234. doi:10.1109/22.971604Burov, A., & Danilov, V. (1999). Suppression of Transverse Bunch Instabilities by Asymmetries in the Chamber Geometry. Physical Review Letters, 82(11), 2286-2289. doi:10.1103/physrevlett.82.2286Cogollos, S., Marini, S., Boria, V. E., Soto, P., Vidal, A., Esteban, H., … Gimeno, B. (2003). Efficient modal analysis of arbitrarily shaped waveguides composed of linear, circular, and elliptical arcs using the BI-RME method. IEEE Transactions on Microwave Theory and Techniques, 51(12), 2378-2390. doi:10.1109/tmtt.2003.819776Conciauro, G., Bressan, M., & Zuffada, C. (1984). Waveguide Modes Via an Integral Equation Leading to a Linear Matrix Eigenvalue Problem. IEEE Transactions on Microwave Theory and Techniques, 32(11), 1495-1504. doi:10.1109/tmtt.1984.1132880Deshpande , M. D. 1997 Analysis of discontinuities in a rectangular waveguide using dyadic Green's function approach in conjuntion with Method of Moments Langley Res. Cent., NASA Hampton, Va.Felsen, L. B., & Marcuvitz, N. (1994). Radiation and Scattering of Waves. doi:10.1109/9780470546307Figueroa, H., Gai, W., Konecny, R., Norem, J., Ruggiero, A., Schoessow, P., & Simpson, J. (1988). Direct Measurement of Beam-Induced Fields in Accelerating Structures. Physical Review Letters, 60(21), 2144-2147. doi:10.1103/physrevlett.60.2144Gai, W., Kanareykin, A. D., Kustov, A. L., & Simpson, J. (1997). Numerical simulations of intense charged-particle beam propagation in a dielectric wake-field accelerator. Physical Review E, 55(3), 3481-3488. doi:10.1103/physreve.55.3481Gluckstern, R. L., van Zeijts, J., & Zotter, B. (1993). Coupling impedance of beam pipes of general cross section. Physical Review E, 47(1), 656-663. doi:10.1103/physreve.47.656Hanson, G. W., & Yakovlev, A. B. (2002). Operator Theory for Electromagnetics. doi:10.1007/978-1-4757-3679-3Hess, M., Park, C. S., & Bolton, D. (2007). Green’s function based space-charge field solver for electron source simulations. Physical Review Special Topics - Accelerators and Beams, 10(5). doi:10.1103/physrevstab.10.054201Iriso-Ariz, U., Caspers, F., & Mostacci, A. (s. f.). Evaluation of the horizontal to vertical transverse impedance ratio for LHC beam screen using a 2D electrostatic code. Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440). doi:10.1109/pac.2003.1289954Jing, C., Liu, W., Xiao, L., Gai, W., Schoessow, P., & Wong, T. (2003). Dipole-mode wakefields in dielectric-loaded rectangular waveguide accelerating structures. Physical Review E, 68(1). doi:10.1103/physreve.68.016502Kim, S. H., Chen, K. W., & Yang, J. S. (1990). Modal analysis of wake fields and its application to elliptical pill‐box cavity with finite aperture. Journal of Applied Physics, 68(10), 4942-4951. doi:10.1063/1.347079Lutman, A., Vescovo, R., & Craievich, P. (2008). Electromagnetic field and short-range wake function in a beam pipe of elliptical cross section. Physical Review Special Topics - Accelerators and Beams, 11(7). doi:10.1103/physrevstab.11.074401Ng, K.-Y. (1990). Wake fields in a dielectric-lined waveguide. Physical Review D, 42(5), 1819-1828. doi:10.1103/physrevd.42.1819Palumbo, L., Vaccaro, V. G., & Wustefeld, G. (1984). Coupling Impedance in a Circular Particle Accelerator, a Particular Case: Circular Beam, Elliptic Chamber. IEEE Transactions on Nuclear Science, 31(4), 1011-1020. doi:10.1109/tns.1984.4333427Panofsky, W. K. H., & Wenzel, W. A. (1956). Some Considerations Concerning the Transverse Deflection of Charged Particles in Radio‐Frequency Fields. Review of Scientific Instruments, 27(11), 967-967. doi:10.1063/1.1715427Rahmat-Samii, Y. (1975). On the Question of Computation of the Dyadic Green’s Function at the Source Region in Waveguides and Cavities (Short Papers). IEEE Transactions on Microwave Theory and Techniques, 23(9), 762-765. doi:10.1109/tmtt.1975.1128671Rosing, M., & Gai, W. (1990). Longitudinal- and transverse-wake-field effects in dielectric structures. Physical Review D, 42(5), 1829-1834. doi:10.1103/physrevd.42.1829Rumolo, G., Ruggiero, F., & Zimmermann, F. (2001). Simulation of the electron-cloud build up and its consequences on heat load, beam stability, and diagnostics. Physical Review Special Topics - Accelerators and Beams, 4(1). doi:10.1103/physrevstab.4.012801Salah, W. (2004). Analytical and numerical investigations of the evolution of wake fields of accelerated electron beams encountering cavity discontinuities in laser-driven RF-free electron laser photoinjector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 533(3), 248-257. doi:10.1016/j.nima.2004.05.129Salah, W., & Dolique, J.-M. (1999). Wake field of electron beam accelerated in a RF-gun of free electron laser «ELSA». Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 431(1-2), 27-37. doi:10.1016/s0168-9002(99)00255-7Stupakov, G., Bane, K. L. F., & Zagorodnov, I. (2007). Optical approximation in the theory of geometric impedance. Physical Review Special Topics - Accelerators and Beams, 10(5). doi:10.1103/physrevstab.10.054401Wang, J. J. H. (1978). Analysis of a Three-Dimensional Arbitrarily Shaped Dielectric or Biological Body Inside a Rectangular Waveguide. IEEE Transactions on Microwave Theory and Techniques, 26(7), 457-462. doi:10.1109/tmtt.1978.1129416Wangler, T. P. (2008). RF Linear Accelerators. doi:10.1002/9783527623426Xiao, L., Gai, W., & Sun, X. (2001). Field analysis of a dielectric-loaded rectangular waveguide accelerating structure. Physical Review E, 65(1). doi:10.1103/physreve.65.016505Zagorodnov, I. (2006). Indirect methods for wake potential integration. Physical Review Special Topics - Accelerators and Beams, 9(10). doi:10.1103/physrevstab.9.102002Zimmermann , F. 1997 A simulation study of electron-cloud instability and beam-induced multipacting in the LHC Eur. Org. for Nucl. Res. Geneva, SwitzerlandZotter, B. W., & Kheifets, S. (1998). Impedances and Wakes in High Energy Particle Accelerators. doi:10.1142/306

An efficient integral equation technique for the analysis of arbitrarily shaped capacitive waveguide circuits

In this contribution a new and efficient integral equation formulation is presented for the analysis of arbitrarily shaped capacitive waveguide devices. The technique benefits from the symmetry of the structure in order to reduce the dimensions of the problem from three to two dimensions. For the first time, this technique formulates the waveguide capacitive discontinuity problem as a 2-D scattering problem with oblique incidence, combined with an efficient calculation of the parallel plate Green's functions. The numerical method allows the efficient evaluation of the electromagnetic fields inside the analyzed structures. Results for different practical capacitive waveguide devices are successfully compared with commercial software tools for validation of the proposed theory. Finally, a novel low-pass filter implementation based on circular conducting posts has been proposed. The field contour lines in the critical gaps of the new structure are curved due to the use of rounded posts. This could result in improved power handling capabilities with respect to standard corrugated low-pass filters. Copyright 2011 by the American Geophysical Union.This work has been developed with financial support from SENECA project reference 08833/PI/08, and CICYT project reference TEC2007-67630-C03.Quesada Pereira, FD.; Vera Castejon, P.; Alvarez Melcon, A.; Gimeno Martinez, B.; Boria Esbert, VE. (2011). An efficient integral equation technique for the analysis of arbitrarily shaped capacitive waveguide circuits. Radio Science. 46:1-11. doi:10.1029/2010RS004458S1114

Single nucleotide polymorphisms in DNA repair genes as risk factors associated to prostate cancer progression

Background Besides serum levels of PSA, there is a lack of prostate cancer specific biomarkers. It is need to develop new biological markers associated with the tumor behavior which would be valuable to better individualize treatment. The aim of this study was to elucidate the relationship between single nucleotide polymorphisms (SNPs) in genes involved in DNA repair and prostate cancer progression.Methods A total of 494 prostate cancer patients from a Spanish multicenter study were genotyped for 10 SNPs in XRCC1, ERCC2, ERCC1, LIG4, ATM and TP53 genes. The SNP genotyping was made in a Biotrove OpenArray® NT Cycler. Clinical tumor stage, diagnostic PSA serum levels, and Gleason score at diagnosis were obtained for all participants. Genotypic and allelic frequencies were determined using the web-based environment SNPator.Results SNPs rs11615 (ERCC1) and rs17503908 (ATM) appeared as risk factors for prostate cancer aggressiveness. Patients wild homozygous for these SNPs (AA and TT, respectively) were at higher risk for developing cT2b – cT4 (OR = 2.21 (confidence interval (CI) 95% 1.47 – 3.31), p < 0.001) and Gleason scores ≥ 7 (OR = 2.22 (CI 95% 1.38 – 3.57), p < 0.001), respectively. Moreover, those patients wild homozygous for both SNPs had the greatest risk of presenting D’Amico high-risk tumors (OR = 2.57 (CI 95% 1.28 – 5.16)).Conclusions Genetic variants at DNA repair genes are associated with prostate cancer progression, and would be taken into account when assessing the malignancy of prostate cancer.This work was subsidized by a grant from the Instituto de Salud Carlos III (Ministerio de Economía y Competitividad from Spain), ID: PI12/01867. Almudena Valenciano has a grant from the Instituto Canario de Investigación del Cáncer (ICIC)