Magnetic structure and phase diagram of TmB4

Magnetic structure of single crystalline TmB4 has been studied by magnetization, magnetoresistivity and specific heat measurements. A complex phase diagram with different antiferromagnetic (AF) phases was observed below TN1 = 11.7 K. Besides the plateau at half-saturated magnetization (1/2 MS), also plateaus at 1/9, 1/8 and 1/7 of MS were observed as function of applied magnetic field B//c. From additional neutron scattering experiments on TmB4, we suppose that those plateaus arise from a stripe structure which appears to be coherent domain boundaries between AF ordered blocks of 7 or 9 lattice constants. The received results suggest that the frustration among the Tm3+ magnetic ions, which maps to a geometrically frustrated Shastry-Sutherland lattice lead to strong competition between AF and ferromagnetic (FM) order. Thus, stripe structures in intermediate field appear to be the best way to minimize the magnetostatic energy against other magnetic interactions between the Tm ions combined with very strong Ising anisotropy.Comment: 4 pages, 4 figures, conference contribution - CSMAG 0

La investigación en ciencia y tecnología de alimentos. Situación actual y tendencias

Este informe, elaborado a requerimiento del Observatorio Iberoamericano de la Ciencia, la Tecnología y la Sociedad del Centro de Altos Estudios Universitarios de la OEI, presenta un panorama detallado de la investigación científica y el desarrollo tecnológico en el área de ciencia y tecnología de alimentos en Iberoamérica. Se ha buscado también dar cuenta de las principales tendencias registradas a nivel mundial en esta temática y su impacto y correlato con lo observado a nivel regional. Las fuentes de información utilizadas a tal fin han sido las publicaciones científicas registradas en la base de datos bibliométrica Science Citation Index y las patentes de invención tramitadas a través del convenio PCT. La identificación de estos registros se realizó bajo la supervisión de expertos regionales en este campo. Se trata de la misma metodología utilizada en estudios previos sobre la nanotecnología y la biotecnología, publicados en 2008 y 2009, respectivamente. Este trabajo presenta un panorama general de la producción científica en ciencia y tecnología de alimentos a nivel mundial y regional, con un detallado acercamiento a los patrones de colaboración entre países. Se han aplicado para ello herramientas de análisis de redes que muestran patrones mundiales y particularidades regionales en la investigación colaborativa. Se abordan también los principales temas estudiadas por los grupos de investigación de la región. Posteriormente, se ofrecen detalles sobre la evolución de la producción de conocimiento de aplicación industrial a través de las patentes de invención. Este estudio incluye las tendencias a nivel mundial y regional, tanto en la titularidad como en la participación de inventores iberoamericanos. Dada la complejidad de este campo, el estudio incluye también un análisis detallado de los campos de aplicación de las patentes de la región y de los principales países que la integran. Entre las evidencias obtenidas se destaca el importante nivel de especialización de algunos países de la región en esta temática. Ese fenómeno es muy claro en el caso español, que alcanza el segundo lugar en cuanto a volumen de publicaciones en 2009. A nivel latinoamericano, Argentina también presenta una marcada especialización en este tema, acorde a la importancia del sector a nivel nacional. El panorama resulta muy diferente en el análisis de las patentes, donde los países iberoamericanos tienen una presencia mucho menor. En este trabajo se pueden ver varios indicios de la falta de consolidación del sistema productivo de alimentos a nivel regional, que no acompaña el creciente desarrollo de la investigación científica.Fil: Barrere, Rodolfo; Argentina.Fil: D'Onofrio, María Guillermina; Argentina.Fil: Tignino, María Victoria; Argentina.Fil: Merlino-Santesteban, Cristian. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina.Fil: Matas, Lautaro; Argentina.Fil: Añon, María Cristina. CIDCA UNLP-CONICET; Argentina.Fil: Martínez, Estela N. CIDCA UNLP-CONICET; Argentina.Fil: Martínez Vidal, José Luis. Universidad de Almería; España

Generic 3D Representation via Pose Estimation and Matching

Though a large body of computer vision research has investigated developing generic semantic representations, efforts towards developing a similar representation for 3D has been limited. In this paper, we learn a generic 3D representation through solving a set of foundational proxy 3D tasks: object-centric camera pose estimation and wide baseline feature matching. Our method is based upon the premise that by providing supervision over a set of carefully selected foundational tasks, generalization to novel tasks and abstraction capabilities can be achieved. We empirically show that the internal representation of a multi-task ConvNet trained to solve the above core problems generalizes to novel 3D tasks (e.g., scene layout estimation, object pose estimation, surface normal estimation) without the need for fine-tuning and shows traits of abstraction abilities (e.g., cross-modality pose estimation). In the context of the core supervised tasks, we demonstrate our representation achieves state-of-the-art wide baseline feature matching results without requiring apriori rectification (unlike SIFT and the majority of learned features). We also show 6DOF camera pose estimation given a pair local image patches. The accuracy of both supervised tasks come comparable to humans. Finally, we contribute a large-scale dataset composed of object-centric street view scenes along with point correspondences and camera pose information, and conclude with a discussion on the learned representation and open research questions.Comment: Published in ECCV16. See the project website http://3drepresentation.stanford.edu/ and dataset website https://github.com/amir32002/3D_Street_Vie

Effects of morphine self-administration on brain glucose metabolism in rats

Abstract of: AMI Annual Conference 2006, March 25-29Chronic exposure to opiates has been shown to influence neural activity in brain regions related to the rewarding process. It also induces neuroadaptations which lead to addiction. We have found in previous works that morphine self-administration produces neuroadaptative changes in brain areas of Fischer-344 rats. The aim of this study is to examine the effect of chronic self-administration of morphine on cerebral glucose metabolismPublicad

Health‐Related Quality of Life in Kidney Donors From the Last Five Decades: Results From the RELIVE Study

Live donation benefits recipients, but the long‐term consequences for donors remain uncertain. Renal and Lung Living Donors Evaluation Study surveyed kidney donors (N = 2455; 61% women; mean age 58, aged 24–94; mean time from donation 17 years, range 5–48 years) using the Short Form‐36 Health Survey (SF‐36). The 95% confidence intervals for White and African‐American donors included or exceeded SF‐36 norms. Over 80% of donors reported average or above average health for their age and sex (p 1 SD below norm). Obesity, history of psychiatric difficulties and non‐White race were risk factors for impaired physical health; history of psychiatric difficulties was a risk factor for impaired mental health. Education, older donation age and a first‐degree relation to the recipient were protective factors. One percent reported that donation affected their health very negatively. Enhanced predonation evaluation and counseling may be warranted, along with ongoing monitoring for overweight donors. Questionnaires completed by 2544 living donors 5 to 48 years postnephrectomy show that 80% have average or better health‐related quality of life for their age and sex based on SF‐36 norms and that obesity, history of psychiatric difficulties and nonwhite race are risk factors for poor health‐related quality of life outcomes, whereas being older, having more education and/or being a first‐degree relation to the recipient predict better outcomes.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/100300/1/ajt12434.pd

Federated learning based on dynamic regularization

https://openreview.net/pdf?id=B7v4QMR6Z9wPublished versio