Domain wall engineering through exchange bias

The control of the structure and position of magnetic domain walls is at the basis of the development of different magnetic devices and architectures. Several nanofabrication techniques have been proposed to geometrically confine and shape domain wall structures; however, a fine tuning of the position and micromagnetic configuration is hardly achieved, especially in continuous films. This work shows that, by controlling the unidirectional anisotropy of a continuous ferromagnetic film through exchange bias, domainwalls whose spin arrangement is generally not favored by dipolar and exchange interactions can be created. Micromagnetic simulations reveal that the domain wall width, position and profile can be tuned by establishing an abrupt change in the direction and magnitude of the exchange bias field set in the system

Carrier Transport in Magnesium Diboride: Role of Nano-inclusions

Anisotropic-gap and two-band effects smear out the superconducting transition (Tc) in literature reported thermal conductivity of MgB2, where large electronic contributions also suppress anomaly-manifestation in their negligible phononic-parts. Present thermal transport results on scarcely explored specimens featuring nano-inclusions exhibit a small but clear Tc-signature, traced to relatively appreciable phononic conduction, and its dominant electronic-scattering. The self-formed MgO as extended defects strongly scatter the charge carriers and minutely the phonons with their longer-mean-free-path near Tc. Conversely, near room temperature, the shorter-dominant-wavelength phonon's transport is hugely affected by these nanoparticles, undergoing ballistic to diffusive crossover and eventually entering the Ioffe-Regel mobility threshold regime.Comment: 14 pages, 4 figures, 28 reference

The connection between the depopulation of localiti es and passenger rail services in the Province of Buen os Aires in Argentina between 1960 and 2009

Indizada en: WorldCat; CrossRef; JournalSeek; Electronic Journals Library (EJL); Zeitschriftendatenbank (ZDB);EZB; Researchbib; Wissenschaftszentrum Berlin (WZB); Directory of Research Journals Indexing (DRJI)---------- Between 1960 and 2001 there were two processes that drew the interest of some social researchers in Argentina. On the one hand there was a process of rural depopulation from localities in the province of Buenos Aires (similar to the process of urbanization across Latin America). On the other hand, there was the break up of the railways that led to the cessation of passenger services to hundreds of localities inside the province of Buenos Aires. This study compares the two variables -localities in the interior of the province of Buenos Aires that lost population and railway lines which recorded decrease in the provision of passenger transport services. Census data and rail traffic between 1960 and 2009 are used. This crosses a quantitative methodology with concepts that the geographer Milton Santos has proposed. Maps are generated to look for any correspondence between these variables. Finally the concept of lag is applied to observe possible temporal relationships between variables. The results represent a first approach to a subject that has never been addressed with this methodology and analysis tool, verifying that it is necessary to incorporate more data to facilitate further analysis.Fil: Diez Tetamanti, Juan Manuel. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Humanidades y Ciencias Sociales Sede Comodoro. Instituto de Investigaciones Geográficas de la Patagonia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Pontrelli Albisetti, Melisa. Universidad Nacional de Mar del Plata. Facultad de Humanidades. Departamento de Geografia. Grupo de Estudios de Ordenacion del Territorio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Nanopatterning spin-textures: A route to reconfigurable magnonics

Magnonics is envisioned to enable highly efficient data transport and processing, by exploiting propagating perturbations in the spin-texture of magnetic materials. Despite the demonstrations of a plethora of proof-of-principle devices, the efficient excitation, transport and manipulation of spin-waves at the nanoscale is still an open challenge. Recently, we demonstrated that the spin-wave excitation and propagation can be controlled by nanopatterning reconfigurable spin-textures in a continuous exchange biased ferromagnetic film. Here, we show that by patterning 90° stripe-shaped magnetic domains, we spatially modulate the spin-wave excitation in a continuous film, and that by applying an external magnetic field we can reversibly â\u80\u9cswitch-offâ\u80\u9d the spin-wave excitation. This opens the way to the use of nanopatterned spin-textures, such as domains and domain walls, for exciting and manipulating magnons in reconfigurable nanocircuits

Adherence to treatment in adolescents with haemophilia : a qualitative study

Adolescents experience important changes in their physical, emotional, social and behavioural development. It is known that adolescents wish to be accepted by their peers, strive for independence and are prone to experiment. The challenge for adolescents with haemophilia is the need for taking responsibility for managing their illness and learning to comply with recommended treatment. This study aimed to investigate the process of adherence to treatment in adolescents with haemophilia

Parvalbumin-neurons of the ventrolateral hypothalamic parvafox nucleus receive a glycinergic input: a gene-microarray study

The ventrolateral hypothalamic parvafox (formerly called PV1-Foxb1) nucleus is an anatomical entity of recent discovery and unknown function. With a view to gaining an insight into its putative functional role(s), we conducted a gene-microarray analysis and, armed with the forthcoming data, controlled the results with the Allen databases and the murine BrainStars (B*) database. The parvafox nucleus was specifically sampled by laser-capture microdissection and the transcriptome was subjected to a microarray analysis on Affymetrix chips. Eighty-two relevant genes were found to be potentially more expressed in this brain region than in either the cerebral cortex or the hippocampus. When the expression patterns of these genes were counterchecked in the Allen-Database of in-situ hybridizations and in the B*-microarray database, their localization in the parvafox region was confirmed for thirteen. For nine novel genes, which are particularly interesting because of their possible involvement in neuromodulation, the expression was verified by quantitative real time-PCR. Of particular functional importance may be the occurrence of glycine receptors, the presence of which indicates that the activity of the parvafox nucleus is under ascending inhibitory control

Antithrombin activity in children with chylothorax

Objective: To determine whether increased antithrombin loss is present in children with chylothorax after cardiac surgery. Methods: Plasma and pleural effusion samples of children with chylous and non-chylous pleural effusion were assayed for antithrombin activity. Results: Ten children with chylothorax and five children with non-chylous pleural effusion were investigated. There was statistically significant increase in mean antithrombin activity in chylous samples (32.2 ± 11.4%) compared to non-chylous samples (14.4 ± 13.9%), and significant decrease in plasma of children with chylothorax (44.6 ± 15.4%) compared to children with non-chylous pleural effusion (69.9 ± 22.4%). Seven of 10 children with chylous and none of the children without chylous developed thrombosis (p < 0.007). Conclusions: Increased loss of antithrombin is present in children with chylothorax, potentially predisposing these children to an increased risk of thrombosis. Repeated antithrombin substitution should be considered in critically ill children with chylothora

Long-term subcutaneous morphine administration after surgery in newborns

Aim: To analyze the management of newborns after major surgery receiving morphine subcutaneously and to identify possible side effects. Methods: Morphine was administered via a subcutaneous catheter (Insuflon®) in 20 newborns after major surgery. Side effects like hypotension, pain during morphine administration and local infection were noted. Morphine dose was adjusted according to the hospital guidelines with the Neonatal Infant Pain Score (NIPS) and the Finnegan withdrawal score. Results: Surgery was performed at the median age of 38 5/7weeks (range: 32 1/7-49 5/7weeks). Before starting subcutaneous morphine administration, patients received intravenous morphine for a median of two weeks (range sixdays to sevenweeks). All patients showed good pain relief with no severe side effects. Three patients reacted with crying to the first dose of subcutaneous morphine. No other side effects occurred. Conclusion: Subcutaneous application of morphine with the Insuflon® catheter is an alternative to intravenous treatment of postoperative pain in neonates. In this small group pain relief was good and side effects were harmles