Introduction to cross LAK 2016: Learning analytics across spaces

For the LAK (Learning Analytics and Knowledge) community, it is highly important to pay attention to the development and deployment of learning analytics solutions for blended learning scenarios where students work at diverse digital and physical learning spaces and interact in different modalities. This workshop has been a first attempt in gathering the sub-community of LAK researchers, learning scientists and researchers from other communities, interested in ubiquitous, mobile and/or face-to-face learning analytics. It was clear for all the attendees that a key concern that has not been deeply explored yet is associated with the mechanisms to integrate and coordinate learning analytics to provide continued support to learning across digital and physical spaces. The two main goals of the workshop were to share perspectives and identify a set of guidelines that could be offered to teachers, researchers or designers to create and connect Learning Analytics solutions according to the pedagogical needs and contextual constraints to provide support across digital and physical learning spaces

Neogene to Quaternary stratigraphic evolution of the Antarctic Peninsula, Pacific Margin offshore of Adelaide Island:Transitions from a non-glacial, through glacially-influenced to a fully glacial state

A detailed morphologic and seismic stratigraphic analysis of the continental margin offshore of Adelaide Island on the Pacific Margin of the Antarctic Peninsula (PMAP) is described based on the study of a regular network of reflection multichannel seismic profiles and swath bathymetry. We present an integrated study of the margin spanning the shelf to the continental rise and establish novel chronologic constraints and offer new interpretations on tectonic evolution and environmental changes affecting the PMAP. The stratigraphic stacking patterns record major shifts in the depositional style of the margin that outline three intervals in its evolution. The first non-glacial interval (Early Cretaceous to middle Miocene) encompasses a transition from an active to a passive margin (early Miocene). The second glacially-influenced interval (middle to late Miocene) is marked by pronounced aggradational sedimentary stacking and subsidence. Ice sheets advanced over the middle shelf of the margin at the end of this second interval, while the outer shelf experienced rare progradational events. The third, fully glaciated interval shows clear evidence of glacially dominated conditions on the margin. This interval divides into three minor stages. During the first stage (late Miocene to the beginning of the early Pliocene), frequent grounded ice advances to the shelf break began, depositing an initial progradational unit. A major truncation surface marked the end of this stage, which coincided with extensive mass transport deposits at the base of the slope. During the second progradational glacial margin stage (early Pliocene to middle Pleistocene), stacking patterns record clearly prograding glacial sequences. The beginning of the third aggradational glacial margin stage (middle Pleistocene to present) corresponded to an important shift in global climate during the Mid-Pleistocene Transition. Morphosedimentary characteristics observed along the margin today began to develop during the latest Miocene but did not become fully established until sometime during the interval between the end of the Pliocene and middle Pleistocene. Between these two time intervals, the northeast lateral migration of the Marguerite Trough also played a critical role in margin evolution, as it controlled ice sheet drainage pathways across the shelf, which in turn influenced development of slope and rise morphologies. Areas offshore from Adelaide Island differ from other areas of the PMAP due to changes in sedimentary processes that resulted from migration of the trough. This study confirms that the PMAP represents an exceptional locality for decoding, reconstructing and linking past tectonic and climatic changes. The study area specifically records not only the most relevant changes in depositional style, but also the relative importance of persistent along- and down-slope sedimentary processes. Our study approach can be extended to other areas and integrated with additional techniques to understand the evolution and the global linkages of the entire Antarctic continental margin and the ice sheets

Strain balanced quantum posts

Quantum posts are assembled by epitaxial growth of closely spaced quantum dot layers, modulating the composition of a semiconductor alloy, typically InGaAs. In contrast with most self-assembled nanostructures, the height of quantum posts can be controlled with nanometer precision, up to a maximum value limited by the accumulated stress due to the lattice mismatch. Here we present a strain compensation technique based on the controlled incorporation of phosphorous, which substantially increases the maximum attainable quantum post height. The luminescence from the resulting nanostructures presents giant linear polarization anisotropy.Comment: Submitted to Applied Physics Letters (7th March 2011). 4 pages, 4 figure

Confinamiento, presencialidad: una mirada a la construcción de una experiencia pedagógica durante la pandemia

The following text presents a pedagogical experience occurred in the district educational institution Eduardo Umaña Luna IED (EUL) - Bogotá Colombia, in the scenario of remote non-presential education caused by the SARS-CoV-2 pandemic; having as theoretical background the tension originated in the fact of moving and inhabiting the school from a materiality to a virtuality; generating on the one hand, a sharing of the sensitive (Rancière, 2009) by producing in the actors of the educational community other practices of socialization mediated by technological tools; and on the other hand, a pedagogical framework for the understanding of subjectivities mediated by online interaction and socialization, the latter and following the conceptualization outlined by Zemelman (2005) from the production and understanding of subjectivities in modernity, in terms of concepts such as agency, resistances and powers identified in the trajectory of the pedagogical experience, which links and gives voice to the educational community.El siguiente texto presenta una experiencia pedagógica acontecida en la institución educativa distrital Eduardo Umaña Luna IED (EUL) - Bogotá Colombia, en el escenario de la educación remota no presencial causada por la pandemia del coronavirus (SARS-CoV-2); teniendo como fondo teórico la tensión originada en el hecho de transitar y habitar la escuela desde una materialidad hacia una virtualidad; generando por un lado, un reparto de lo sensible (Rancière, 2009) al producirse en los actores de la comunidad educativa otras prácticas de socialización mediadas por las herramientas tecnológicas; y por el otro un marco pedagógico para la comprensión de subjetividades mediadas por la interacción y la socialización online, esto último y siguiendo la conceptualización trazada por Zemelman (2005) desde la producción y comprensión de las subjetividades en la modernidad, en clave de conceptos como el agenciamiento, las resistencias y las potencias identificadas en la trayectoria de la experiencia pedagógica, que vincula y da voz a la comunidad educativa

Finishing lambs using an integral feed under a restricted-feeding program in an intensive production system in Northern Mexico

The objective of this study was to compare the productive performance of finishing lambs using an integral diet under a restricted-feeding program. Ten Dorper lambs were assigned to two homogenous groups according to live weight and age under a complete randomised block design. Group 1 was fed a traditional diet commonly used by the producer and group 2 was fed an integral feed restricted to 75% of dry matter requirement of lambs. The evaluated variables were: dry matter intake, initial and final live weight, daily weight gain, feed efficiency and body growth expressed in height, body length, thoracic diameter, cane length and cane width. A partial cost analysis was carried out to evaluate the economic viability. Lambs fed with the integral feed had better feed efficiency, higher dry matter intake, daily weight gain, height, body length and thoracic diameter when compared with the lambs fed the traditional diet. The use of an integral feed under a restricted-feeding program reduced the cost of finishing lambs by 2.46 dollars per head and finishing length by 120 days. Overall, providing an integral feed under a restricted-feeding program is a viable alternative for improving finishing lambs under intensive conditions in the Northern Mexico

Hypoalbuminemia in the outcome of patients with non-variceal upper gastrointestinal bleeding

AbstractIntroduction and aimThe role of serum albumin level in patients with non-variceal upper gastrointestinal bleeding (NVUGB) has not been extensively studied. Our aim was to evaluate the role of serum albumin on admission in terms of in-hospital mortality in patients with NVUGB.Materials and methodsPatients admitted with NVUGB during a 4-year period were prospectively included. Demographic, clinical, and laboratory data were collected. ROC curve analysis was used to determine the cutoff value for serum albumin on admission that made a distinction between deceased patients and survivors with respect to serum albumin on admission, as well as its overall performance compared with the Rockall score.Results185 patients with NVUGB were evaluated. Men predominated (56.7%) and a mean age of 59.1±19.9 years was found. Mean serum albumin on admission was 2.9±0.9g/dl with hypoalbuminemia (< 3.5g/dl) detected on admission in 71.4% of cases. The ROC curve found that the best value for predicting hospital mortality was an albumin level of 3.1g/dl (AUROC 0.738). Mortality in patients with albumin ≥ 3.2g/dl was 1.2% compared with 11.2% in patients with albumin<3.2g/dl (P=.009; OR 9.7, 95%CI 1.2-76.5). There was no difference in overall performance between the albumin level (AUORC 0.738) and the Rockall score (AUROC 0.715) for identifying mortality.ConclusionsPatients with hypoalbuminemia presenting with NVUGB have a greater in-hospital mortality rate. The serum albumin level and the Rockall score perform equally in regard to identifying the mortality rate

Interfacial-Redox-Induced Tuning of Superconductivity in YBa2Cu3O7-δ.

Solid-state ionic approaches for modifying ion distributions in getter/oxide heterostructures offer exciting potentials to control material properties. Here, we report a simple, scalable approach allowing for manipulation of the superconducting transition in optimally doped YBa2Cu3O7-δ (YBCO) films via a chemically driven ionic migration mechanism. Using a thin Gd capping layer of up to 20 nm deposited onto 100 nm thick epitaxial YBCO films, oxygen is found to leach from deep within the YBCO. Progressive reduction of the superconducting transition is observed, with complete suppression possible for a sufficiently thick Gd layer. These effects arise from the combined impact of redox-driven electron doping and modification of the YBCO microstructure due to oxygen migration and depletion. This work demonstrates an effective step toward total ionic tuning of superconductivity in oxides, an interface-induced effect that goes well into the quasi-bulk regime, opening-up possibilities for electric field manipulation

Transmission electron microscopy study of vertical quantum dots molecules grown by droplet epitaxy

3 páginas, 3 figuras.-- Progress in Applied Surface, Interface and Thin Film Science - SURFINT SREN II.-- PACS codes: 68.37.Lp; 81.05.Ea; 81.15.HiThe compositional distribution of InAs quantum dots grown by molecular beam epitaxy on GaAs capped InAs quantum dots has been studied in this work. Upper quantum dots are nucleated preferentially on top of the quantum dots underneath, which have been nucleated by droplet epitaxy. The growth process of these nanostructures, which are usually called as quantum dots molecules, has been explained. In order to understand this growth process, the analysis of the strain has been carried out from a 3D model of the nanostructure built from transmission electron microscopy images sensitive to the composition.This work was supported by the Spanish MCI (TEC2008-06756-C03-02/TEC), CONSOLIDER CSD2009-00013, and the Junta de Andalucia (PAI research groups TEP-120 and TIC-145, project P08-TEP-03516).Peer reviewe

La migración de jornaleros agrícolas tlaxcaltecas a Canadá: un sistema complejo

In this article, system theory or a systemic approach is used inorder to explain interrelations in the complex and multi-factorialmigratory process that hundreds of people from Tlaxcala gothrough every year, especially during the season when Canadarequires labor for its agricultural work, which spans fromgreenhouse preparation to harvesting and packing fruits andvegetables; migration is legal under the implementation of theSeasonal Agricultural Workers Program México – Canada(PTAT, for its initials in Spanish), which is managed in Méxicoby the Ministry of Labor and Social Prevision, in each of theparticipating entities in the country. This is a historical processwhich, due to its complexity, requires a holistic approach inorder to tackle not only the economic, demographic or culturalaspects of the process, but also the political, environmental andeven the visible and invisible of subjective aspects that the processand actors involved present: domestic violence, psychologicaldisorders, and emotional, moral and even existential crises. Thus,a new perspective is used for the analysis of the migratory processfrom the state of Tlaxcala.En este trabajo se retoma la teoría de sistemas o enfoque sistémico,para explicar las interrelaciones del proceso migratorio complejoy multifactorial que cientos de tlaxcaltecas viven cada año, especialmenteen la temporada en que Canadá requiere de mano deobra para su trabajo agrícola, que va desde la preparación delinvernadero, hasta la cosecha y empacado de frutas y verduras;migración que es legal bajo la operación del Programa de TrabajadoresAgrícolas Temporales Mexicanos a Canadá (PTAT), manejadoen México por la Secretaria del Trabajo y Previsión Social,en cada una de las entidades federativas participantes del país. Setrata de un proceso histórico que, debido a su complejidad, precisade un enfoque holístico para abordar no sólo lo económico,demográfico, o cultural del proceso, sino también lo político, loambiental, y aun lo visible e invisible de lo subjetivo que presentanel proceso y actores involucrados: violencia intrafamiliar, trastornospsicológicos, crisis emocionales, morales y hasta existenciales.De esta manera se utiliza una nueva perspectiva para el análisisdel proceso migratorio del estado de Tlaxcala

Compositional mapping by Z-contrast imaging

This research was sponsored by the Office of Basic Energy Sciences, Materials Sciences and Engineering Division, U.S. Department of Energy (SJP, MV), by the Spanish MCI (projects CONSOLIDER INGENIO 2010 CSD2009-00013 andTEC2008-06756-C03-02/TEC,) and the Junta de Andalucía (PAI research’s groups TEP-120 and TIC-145; project P08-TEP-03516).Peer Reviewe