Performance of Coded Wireless Power Controllers for Wind Turbines Connected to a Smart Grid

Nowadays, with the advance of smart grid technologies, the participation of renewable energy in the power systems is changing for attend new requirements and increase efficiency of the systems. With a view of smart grid context, this work proposes the review of a modern wireless control system proposed based on for squirrel cage induction generators connected to the power grid. The wireless communication system applied transmits the reference power signals to the SCIG controller with the necessary reliability to ensure the power quality provided by the wind turbine employing the OFDM multi-carrier transmission technique associated with an LDPC coding scheme. The satisfactory results of this research endorse the operability and advantages of application of wireless control system for windy plants when some requirements and techniques, based on digital modulation and coding techniques, are employees

Pediatric Chronic Lower Respiratory Disorders:Microbiological and Immunological Phenotype

The role of infectious agents in children with recurrent/chronic lower respiratory disorders (R/CLRDs) is not clear, whereas it has been largely studied in acute respiratory diseases. The purpose of the study was to evaluate the frequency of infections, in particular viral infections, in children with R/CLRDs correlatingtheir presence with clinical/biohumoral parameters. Eighty children affected by R/CLRDs underwent bronchoscopy and analysis of bronchoalveolar lavage (BAL) for cells, mediators (eosinophil cationic protein\u2014ECP, interleukin\u2014IL-8, tumor necrosis factor\u2014TNFa) and pathogens (viruses and bacteria). Viral genomes were detected in 50/80 (62.5%) children. Rhinovirus, the principal detected virus (26/50, 52%), occurred more frequently in male children. Higher percentages of BAL neutro-phils and IL-8 values were detected in virus positive than negative children. ECP values resulted significantly higher in the children with rhinovirus than in those with other viruses. No other statistically significant correlation between viral findings and clinical/biohumoral data were found. Respiratory viruses, especially rhinovirus, seem to play an important role in children with R/CLRDs. They are associated with changes in BAL cellularity and inflam-matory cytokines. Further studies are needed to confirm the persistence of viruses in these patients and to identify eventual therapeutic strategies

Improvement of Robustness of MPC Adding Repetitive Behavior for the DFIG Current Control

This paper shows an increase in the robustness of a DFIG-based wind energy system when a predictive-repetitive controller in the dq reference frame is used for the control of the rotor current. This designing approach proposes a model predictive control with a receding horizon technique that uses the frequency decomposition of the reference signal as a filter. Furthermore, an augmented space-state model from the original plant model is obtained, and its implementation is addressed from the perspective of normal operating conditions of DFIG in wind energy systems. Additionally, this repetitive controller increases the robustness of the predictive control when a mismatch in machine parameters is considered. Experimental results presented in this paper endorse the advantages of this controller

Acute-on-chronic liver failure: A comparison of three different diagnostic criteria

Introduction and aim: Different criteria are applied for the diagnosis of acute-on-chronic liver failure (ACLF). Our aim was to compare the performance of different ACLF diagnostic criteria for predicting mortality. Materials and methods: This was a prospective cohort study of adult cirrhotic patients admitted to a tertiary hospital for acute decompensation (AD) of cirrhosis. The evaluated outcome was mortality at 28 and 90 days, according to the different ACLF diagnostic criteria: Chronic Liver Failure Consortium (CLIF-C), Asian Pacific Association for the Study of the Liver-ACLF Research Consortium (AARC) and North American Consortium for the Study of End-Stage Liver Disease (NACSELD). Prognostic performance was evaluated using receiver operating characteristic (ROC) curves. Results: 146 patients were included. 43 (29.5%) with ACLF according to CLIF-C definition, 14 (9.6%) with ACLF by AARC definition, and 6 (4.1%) by NACSELD definition. According to Kaplan–Meier survival analyses median survival of patients with ACLF by CLIF-C definition was 27.0 days, median survival of patients with ACLF by AARC definition was 27.0 days, and median survival of patients with ACLF by NACSELD definition was 4.0 days. The areas under the ROC curves for performance evaluation in predicting mortality at 28 days for CLIF-C, AARC and NACSELD criteria were, respectively, 0.710, 0.560 and 0.561 (p = 0.002). Regarding 90-day mortality, the areas under the ROC curves were 0.760, 0.554 and 0.555 respectively (p < 0.001). Conclusion: ACLF definition proposed by CLIF-C had better performance in predicting mortality at 28 and 90 days when compared to criteria proposed by AARC and NACSELD

High viral frequency in children with gastroesophageal reflux-related chronic respiratory disorders.

INTRODUCTION: In the pediatric population chronic respiratory disorders (CRDs) include many pathological entities in which gastroesophageal reflux (GER) may play a role in the induction or persistence of clinical symptoms. It is not well established whether infective agents may be present in lung aspiration. The aim of the work was to investigate whether different infective agents could be found in children with GER-related CRDs. MATERIALS AND METHODS: Extensive microbiological investigations including culture for bacterial agents, serology, direct fluorescent antigen and polymerase chain reaction analyses for different respiratory viruses were performed in 32 children (18 males, 14 females, mean age 5.0 +/- 2.4 years). Fifteen children out of 32 considered as "aspirators" (lipid-laden macrophage index-LLMI->or=86 and pathological pH-assay) were compared to 17 "non-aspirators" (LLMI < 86 and normal pH-assay). RESULTS: Aspirators were older (6.0 +/- 1.9 vs. 4.2 +/- 2.5 years, P = 0.006) and less frequently atopic (13% vs. 59%, P = 0.01) than non-aspirators. A high frequency of viral infections (20/32, 62.5%) was found, with frequent occurrence of multiple infections (10/20, 50%). Aspirators showed more frequent viral infections than non-aspirators (87% vs. 41%, P = 0.01). Rhinovirus and respiratory syncytial virus were the principal detected viruses in the aspirator group. CONCLUSIONS: Viral infections could play a key role in the pathogenesis of GER-related CRDs

O docente de enfermagem e sua representação sobre a formação profissional La representación del docente de enfermería sobre su formación profesional The nursing professor and their representation about the professional formation

Trata-se de uma pesquisa de natureza qualitativa, cujo objetivo foi identificar a representação do docente sobre a formação do enfermeiro. Foram entrevistados 22 enfermeiros docentes do curso de graduação em Enfermagem de duas instituições de ensino superior da cidade de Curitiba. Os preceitos éticos foram respeitados, e o projeto foi aprovado pelo Comitê do Setor de Ciências de Saúde da Universidade Federal do Paraná. As entrevistas foram gravadas e transcritas, e os relatos, analisados por meio técnica da Análise de Conteúdo. O tema que emergiu dos discursos foi: A representação do perfil do enfermeiro formado pela instituição. Este tema possibilitou a composição de três categorias: enfermeiro crítico-reflexivo, humanista e autônomo. Consideramos que a representação dos docentes sobre a formação do enfermeiro afasta-os cada vez mais do paradigma tradicional, aproximando-os do paradigma emergente que propõe a metodologia do aprender a aprender, e que suas representações estão ancoradas na legislação vigente e na missão da universidade: ensino, pesquisa e extensão.<br>Tratase de una investigación de naturaleza cualitativa, cuyo objetivo fue identificar la representación del docente en la formación del enfermero. Fueron entrevistados 22 enfermeros docentes del curso de graduación en Enfermería de dos instituciones de educación superior de la ciudad de Curitiba (Brasil). Los preceptos éticos fueron respetados, y el proyecto fue aprobado por el Comité del Sector de Ciencias de Salud de la Universidad Federal del Paraná (Brasil). Las entrevistas fueron grabadas y transcriptas, y los relatos, analizados por medio de la técnica del Análisis del Contenido. El tema que emergió de los discursos fue: La representación del perfil del enfermero formado por la institución. Este tema hizo posible la composición de tres categorías: enfermero crítico-reflexivo, humanista y autónomo. Consideramos que la representación de los docentes sobre la formación del enfermero lo aleja más del paradigma tradicional, acercándole del paradigma emergente que propone la metodología del aprender a aprender, y que sus representaciones están ancladas en la ley vigente y en la misión de la universidad: educación, investigación y extensión.<br>It is about a research of qualitative nature, whose objective was to identify the representation of the professor on the formation of the nurse. Were interviewed 22 teaching nurses of the course of graduation in Nursing of two institutions of superior education of the city of Curitiba (Brazil). The ethics precepts were respected, and the project was approved by the Committee of the Sector of Sciences of Health of the Federal University of the Paraná (Brazil). The interviews were recorded and transcribing, and the reports, analyzed by the technique of the Analysis of Content. The theme that emerged of the speeches was: The representation of the profile of the nurse formed by the institution. This theme made possible the composition of three categories: critical-reflexive nurse, humanistic and autonomous worker. We consider that the representation of the professors about the formation of the nurse more moves them away from the traditional paradigm, approaching them of the emergent paradigm that considers the methodology of learning to learn, and that their representations are anchored in the current law and in the mission of the university: education, research and extension

Towards New Horizons in Ab Initio Nuclear Structure Theory

We present a cross-section of recent advances in ab initio nuclear structure theory, which have changed the horizons of this field. Starting from chiral effective field theory to construct the nuclear Hamiltonian and the similarity renormalization group to further soften it, we address several many-body approaches that have seen major developments over the past few years. We show that the domain of ab initio nuclear structure theory has been pushed well beyond the p-shell and that quantitative QCD-based predictions are becoming possible all the way from the proton to the neutron drip line up into the medium-mass regime