Scattering in the energy space for Boussinesq equations

In this note we show that all small solutions in the energy space of the generalized 1D Boussinesq equation must decay to zero as time tends to infinity, strongly on slightly proper subsets of the space-time light cone. Our result does not require any assumption on the power of the nonlinearity, working even for the supercritical range of scattering. No parity assumption on the initial data is needed

A novel programmable lysozyme-based lysis system in Pseudomonas putida for biopolymer production

Indexación: Scopus; Web of Science.Cell lysis is crucial for the microbial production of industrial fatty acids, proteins, biofuels, and biopolymers. In this work, we developed a novel programmable lysis system based on the heterologous expression of lysozyme. The inducible lytic system was tested in two Gram-negative bacterial strains, namely Escherichia coli and Pseudomonas putida KT2440. Before induction, the lytic system did not significantly arrest essential physiological parameters in the recombinant E. coli (ECPi) and P. putida (JBOi) strain such as specific growth rate and biomass yield under standard growth conditions. A different scenario was observed in the recombinant JBOi strain when subjected to PHA-producing conditions, where biomass production was reduced by 25% but the mcl-PHA content was maintained at about 30% of the cell dry weight. Importantly, the genetic construct worked well under PHA-producing conditions (nitrogen-limiting phase), where more than 95% of the cell population presented membrane disruption 16 h post induction, with 75% of the total synthesized biopolymer recovered at the end of the fermentation period. In conclusion, this new lysis system circumvents traditional, costly mechanical and enzymatic cell-disrupting procedures.https://www.nature.com/articles/s41598-017-04741-2.pd

Datasets for transcriptomics, q-proteomics and phenotype microarrays of polyphosphate metabolism mutants from Escherichia coli

Indexación: Scopus.Author acknowledges Fondecyt Grants 1120209, 1121170 and Anillo ACT-1107Here, we provide the dataset associated with our research article on the polyphosphate metabolism entitled, “Multi-level evaluation of Escherichia coli polyphosphate related mutants using global transcriptomic, proteomic and phenomic analyses”. By integrating different omics levels (transcriptome, proteome and phenome), we were able to study Escherichia coli polyphosphate mutant strains (Δppk1, Δppx, and Δppk1-ppx). We have compiled here all datasets from DNA microarrys, q-proteomic (Isotope-Coded Protein Labeling, ICPL) and phenomic (Phenotype microarray) raw data we have obtained in all polyP metabolism mutants.http://www.sciencedirect.com/science/article/pii/S2352340917300860?via%3Dihu

A Multicultivar Approach for Grape Bunch Weight Estimation Using Image Analysis

The determination of bunch features that are relevant for bunch weight estimation is an important step in automatic vineyard yield estimation using image analysis. The conversion of 2D image features into mass can be highly dependent on grapevine cultivar, as the bunch morphology varies greatly. This paper aims to explore the relationships between bunch weight and bunch features obtained from image analysis considering a multicultivar approach. A set of 192 bunches from four cultivars, collected at sites located in Portugal and South Africa, were imaged using a conventional digital RGB camera, followed by image analysis, where several bunch features were extracted, along with physical measurements performed in laboratory conditions. Image data features were explored as predictors of bunch weight, individually and in a multiple stepwise regression analysis, which were then tested on 37% of the data. The results show that the variables bunch area and visible berries are good predictors of bunch weight (R2 ranging from 0.72 to 0.90); however, the simple regression lines fitted between these predictors and the response variable presented significantly different slopes among cultivars, indicating cultivar dependency. The elected multiple regression model used a combination of four variables: bunch area, bunch perimeter, visible berry number, and average berry area. The regression analysis between the actual and estimated bunch weight yielded a R2 = 0.91 on the test set. Our results are an important step towards automatic yield estimation in the vineyard, as they increase the possibility of applying image-based approaches using a generalized model, independent of the cultivarinfo:eu-repo/semantics/publishedVersio

La Vida Cotidiana de la Niñez en el Campamento "Felipe Camiroaga"

Tesis (Trabajo Social)En la presente investigación, se expondrán los antecedentes de las denominadas “Tomas” en la Quinta región y el país, enfatizando la gran cantidad de campamentos, y como se evidencia en Chile desde la historia Socio-Política, desde la “Cuestión social” y cómo se construye la problematización del fenómeno investigado, a partir de las políticas de vivienda y sus distintas falencias en el sistema económico hegemónico. Esta investigación fue realizada en el territorio denominado “Campamento Felipe Camiroaga” por la observación constante del equipo de investigación, debido a la práctica profesional realizada en el mismo lugar. En el marco teórico se trabaja desde la visión Crítico-Marxista basada en Kosik y sus distintos documentos entorno a la dialéctica. Luego, se revisan las distintas visiones de “Vida Cotidiana” principalmente por Henri Lefebvre, Michel De Certau, entre otros autores basados en el paradigma mencionado anteriormente esto llegando a la urbanización Capitalista desde el análisis de Christian Topalov y el Derecho a la ciudad. Posteriormente se detalla el enfoque metodológico cualitativo, y la etnografía como método siendo lo que más se ajusta a la investigación. El Campamento Felipe Camiroaga, en relación a otros campamentos de la región, aún no cuenta con la antigüedad suficiente para estar dentro del “Registro Nacional de Campamentos” del MINVU, a pesar de ser uno de los más grandes a nivel Nacional. Mediante un acercamiento con las y los pobladores se expone de manera innovadora al grupo de investigación la riqueza e importancia de reconstruir a través de sus miembros la historia y sobre todo visibilizar cómo se plantea la convivencia a diario en el campamento con el objetivo de recabar en las diferentes variables que se presentan como obstaculizadores y facilitadores en su diario vivir, este interés se presenta para el equipo de investigación ya que, la práctica profesional que se está realizando ha permitido observar los distintos discursos planteados por parte de las y los pobladores quienes en la situación que se encuentran, en situación de precariedad, por las diferentes experiencias personales y por una falencia esencial del Estado en las Políticas de Vivienda y urbanismo, han tomado la decisión de tomarse un terreno y vivir de manera permanente, asumiendo todos los riesgos a los que se exponen, sobre todo la falta de servicios básicos y la irregularidad a la que se enfrentan, en los discursos planteados, se visualiza un enojo con la autoridad actual tanto Local como Nacional

Reflective practice and participant involvement in research

This article discusses the relationships between reflective practice and research for professionals who are research participants. It offers an analysis of the opportunities for reflective practice created for participants through their involvement in research. Three examples of research into professional’s perspectives on practice with children in Chile, Malta and Cyprus are presented and analysed. The analysis of the three examples shows the role research can have in creating particular kinds of spaces and relationships that facilitate reflection and how it can introduce dimensions that are normally excluded from critical reflection within a profession. The examples show this as involving: reparative and augmented critical reflection; new information and meaning making and the interactions between macro, meso and micro perspectives

Off-Shore wind potential estimation along the coast of Chile by using scatterometer and Reanalysis data

Revista oficial de la Asociación Española de Teledetección[EN] This work presents the first offshore wind potential estimation over the coast of Chile using long term data series from “QuikSCAT (V04) wind vectors” and ERA-interim’s wind product between 1999-2009 and 1979-2012, respectively. Weibull and Rayleigh’s distribution were used to adjust the data series from the study period to find the probability density function, mean wind speed, maximum and minimum from each data series adjusted per pixel. Power generation and a capacity factor were estimated for the whole scene using three wind turbine models corresponding to 3.6, 5.0 and 8.0 MW. The images obtained from the data processing were grouped into three different wind power zones named (A) located up north, (B) in the center and (C) down south-center. The mean capacity factors are higher than 20%, moreover B and C areas have an average of 36%. This work shows the high wind power potential to generate electricity by using wind off-shore technologies along the coast of Chile.[ES] En este trabajo se presenta la primera estimación del potencial eólico offshore de Chile a partir de información de viento proveniente del producto “QuikSCAT (V04) wind vectors” y datos de velocidad del viento del reanalysis ERA-interim para el periodo 1999-2009 y 1979-2012 respectivamente. Ambos conjuntos de datos fueron ajustados a las distribuciones de Weibull y Rayleigh para encontrar la probabilidad de ocurrencia y las medias, mínimas y máximas de cada serie de tiempo ajustada por pixel. Para toda la escena se estimaron los valores de generación eléctrica y factor de planta usando tres turbinas aerogeneradores de 3,6, 5,0 y 8,0 MW. Las imágenes resultantes fueron agrupadas en tres diferentes zonas de potencial a lo largo de Chile, denominadas (A) en el extremo norte, (B) en el centro y (C) en el centro-sur. Los factores de planta promedio son superiores al 20%, siendo un 36% para las zonas B y C. Esto demuestra el alto potencial para la generación de energía eléctrica a base de turbinas eólicas frente a las costas de Chile.Esta publicación ha sido en parte financiada por el Programa U-INICIA Concurso de Reforzamiento de Inserción Productiva de Nuevos Académicos VID 2012; código U-INICIA 4/0612 Universidad de Chile. Programa U-Viajes, VID-UChile, Beca Santander Universidad de Chile 2013 para jóvenes investigadores. Los autores agradecen a NASA Ocean Vector Winds Science Team y a ERA-interim Reanalysis por lo datos entregados.Mattar, C.; Villar-Poblete, N. (2014). Estimación del potencial eólico off-shore en las costas de Chile utilizando datos de escaterómetro y Reanalysis. Revista de Teledetección. (41):49-58. https://doi.org/10.4995/raet.2014.2787SWORD495841Yaniktepe, B., Koroglu, T., & Savrun, M. M. (2013). Investigation of wind characteristics and wind energy potential in Osmaniye, Turkey. Renewable and Sustainable Energy Reviews, 21, 703-711. doi:10.1016/j.rser.2013.01.00