Experimental semi-autonomous eigensolver using reinforcement learning.

The characterization of observables, expressed via Hermitian operators, is a crucial task in quantum mechanics. For this reason, an eigensolver is a fundamental algorithm for any quantum technology. In this work, we implement a semi-autonomous algorithm to obtain an approximation of the eigenvectors of an arbitrary Hermitian operator using the IBM quantum computer. To this end, we only use single-shot measurements and pseudo-random changes handled by a feedback loop, reducing the number of measures in the system. Due to the classical feedback loop, this algorithm can be cast into the reinforcement learning paradigm. Using this algorithm, for a single-qubit observable, we obtain both eigenvectors with fidelities over 0.97 with around 200 single-shot measurements. For two-qubits observables, we get fidelities over 0.91 with around 1500 single-shot measurements for the four eigenvectors, which is a comparatively low resource demand, suitable for current devices. This work is useful to the development of quantum devices able to decide with partial information, which helps to implement future technologies in quantum artificial intelligence.

Effect on the Chemical, Structural and Magnetic Characteristics on Fe-Doped SrTiO³.

SrTiO³ nanopowders doped with various percentages of Fe (0, 1, 3, and 5 mol%) was synthesized, determining its chemical and structural properties using X-ray diffraction and X-ray photoelectron spectroscopy. The magnetic properties of the samples were studied using hysteresis curves obtained by an alternating gradient magnetometer. Theoretical calculations within the framework of the density functional theory are also performed to support experimental data. The results indicated that Fe incorporated into de SrTiO³ structure induced intrinsic magnetic properties, which increase as the Fe percentage increase. At 5 mol% of Fe in the sample showed a single-domain state, typical of a ferromagnetic material capable for information storage. This latter result would be due to the reduction of oxygen vacancies as more Fe was added and to the presence of Fe2+ and Fe3+ ions reinforced the magnetic behaviour of the compound.

Divulgación de información sobre los pacientes del hospital: ¿Derecho o responsabilidad? / Dissemination of hospital patient data: A right or responsibility?

Los medios de comunicación son un importante actor en toda sociedad democrática. Su rol social en las cuestiones de salud, y en particular en lo relacionado con los derechos de la infancia, merece ser destacado. La manera en que se describen los niños, niñas y adolescentes en los medios tiene un impacto profundo en la actitud de la sociedad hacia la niñez. Un manejo adecuado de la imagen de la infancia que mostramos en los medios de comunicación es vital para contribuir a redimensionar la situación de los niños, niñas y adolescentes en la sociedad y valorar sus identidades, sus deseos y preferencias, sus miedos y sus derechos. Como hospital pediátrico nos cabe una gran responsabilidad respecto a lo que comunicamos, ya que los niños, niñas y adolescentes y sus familias son un grupo extremadamente vulnerable, más aún cuando son pacientes y en razón de todo ello depositan su confianza en recibir una especial protección, eminentemente asistencial y que debe ser inseparable de los aspectos jurídicos y éticos. Hay que considerar la diferencia del uso de la información con fines científicos y docentes, de la que puede ser utilizada como nota periodística, ya que van destinadas a grupos diferentes y persiguen objetivos distintos (AU)

The media is an important actor in the democratic society. Their role in health issues, particularly those related to children's rights, is outstanding. The way boys and girls and adolescents are described in the media has a profound impact on the attitude of society towards children. Adequate management of the image of childhood we show in the media is a vital contribution to the redimensioning of the situation of boys and girls, and adolescents in society respecting their identities, wishes, fears, and rights. As a pediatric hospital we have a great responsibility regarding what we communicate because boys and girls and adolescents as well as their families are an extremely vulnerable group, even more so when they are patients and consequently deposit their trust in us to receive special protection and care, which should be inseparable from judicial and ethical aspects. Data use for scientific and teaching aims should be distinguished from information used in the media, as target groups and aims pursued are different (AU)

Heterogeneity of growth hormone immunoreactivity in lymphoid tissues and changes during ontogeny in domestic fowl.

Growth hormone (GH) expression is not confined to the pituitary and occurs in many extrapituitary tissues. Here, we describe the presence of GH-like moieties in chicken lymphoid tissues and particularly in the bursa of Fabricius. GH-immunoreactivity (GH-IR), determined by ELISA, was found in thymus, spleen, and in bursa of young chickens, but at concentrations <1% of those in the pituitary gland. Although the GH concentration in the spleen and bursa was approximately 0.82 and 0.23% of that in the pituitary at 9-weeks of age, because of their greater mass, the total GH content in the spleen, bursa, and in thymus were 236, 5.18, and 31.5%, respectively, of that in the pituitary gland. This GH-IR was associated with several proteins of different molecular size, as in the pituitary gland, when analyzed by SDS-PAGE under reducing conditions. While most of the GH-IR in the pituitary was associated with the 26 kDa monomer (40%), the putatively glycosylated 29 kDa variant (16%), the 52 kDa dimer (14%) and the 15 kDa submonomeric isoform (16%), GH-IR in the lymphoid tissues was primarily associated (27-36%) with a 17 kDa moiety, although bands of 14, 26, 29, 32, 37, 40, and 52 kDa were also identified in these tissues. The heterogeneity pattern and relative abundance of bursal GH-IR bands were determined during development between embryonic day 13 (ED13) and 9-weeks of age. The relative proportion of the 17 kDa GH-like band was higher (45-58%) in posthatched birds than in the 15 and 18-day old embryos (21 and 19%, respectively). The 26 kDa isoform was minimally present in embryos (<4% of total GH-IR) but in posthatched chicks it increased to 12-20%. Conversely, while GH-IR of 37, 40, and 45 kDa were abundantly present in embryonic bursa ( approximately 30% at ED13 and approximately 52-55% at ED15 and ED18, respectively), in neonatal chicks and juveniles they accounted for less than 5%. These ontogenic changes were comparable to those previously reported for similar GH-IR proteins in the chicken testis during development. In summary, these results demonstrate age-related and tissue-specific changes in the content and composition of GH in immune tissues of the chicken, in which GH is likely to be an autocrine or paracrine regulator.

Medicinas complementarias, alternativas e integradora: encuenta sobre conocimiento, uso y opinión en el personal de enfermería de un hospital pediátrico de alta complejidad / Complementary, alternative and integrative medicines: survey on knowledge, use and opinion of the nursing staff of a high complexity pediatric hospital

La medicina alternativa y complementaria (MAC) es un conjunto de sistemas, prácticas, productos médicos y de atención de la salud que no se considera actualmente parte de la medicina convencional. La medicina integradora combina ambas, con datos científicos de alta calidad sobre seguridad y eficacia. El objetivo de este estudio es explorar el nivel de conocimiento, uso y opiniones sobre las MAC entre el personal estable de enfermería de un hospital pediátrico de alta complejidad. Materiales y Métodos: Estudio descriptivo de corte transversal obtenido mediante encuesta semiestructurada, auto administrada, voluntaria y anónima de 4 módulos: datos personales de conocimiento, usos y opiniones. Población muestra: 200 enfermeros del Hospital Garrahan sobre un total de 870 (muestreo probabilístico sistemático IC 95 por ciento, prevalencia: 50 por ciento, índice de amplitud: 0.10 a 0.05), del 11/2007 al 07/2008. Resultados: Edad (media más menos DS): 42 más menos 10 años (rango: 25 - 65). Para el 90 por ciento de los encuestados la MAC resultaría útil como complemento de la medicina convencional. Si solo se considera a quienes nunca realizaron prácticas relacionadas a la MAC (55% de los encuestados), esta evaluación arroja un 82 por ciento. El 80 por ciento requieren mayor información. Conclusiónes: El grupo manifiesta actitudes favorables hacia la MAC, pero el conocimiento es muy limitado. Hay un alto grado de interes en lograr mayor formación.