•This paper gives a performance study of the Positive Sequence Detector plus a dqPLL.•A real-time digital simulation platform is used to validate the results.•With low-level harmonic pollution it is ...not a necessity to use a complicated synchronization algorithm.•A significant attenuation of the harmonic contamination is attained when the PSD block is used.•A good power factor can be obtained even though variations in frequency occur.
In a distributed generation (DG) system, several renewable agents are connected to the low-voltage 3-phase utility grid through an inverter which is used as power condition and must guarantee the higher efficiency of the renewable agent. To attain this level of efficiency, a unitary power factor (FP) between the inverter currents and the utility grid voltages is necessary, and a synchronization algorithm is needed for the perfect synchronization between the renewable agent and the 3-phase utility grid. Within this context, this paper gives a performance study of the Positive Sequence Detector plus a Synchronous Reference Frame Phase-Locked Loop (PSD+dqPLL) as the synchronization algorithm, evaluating its accuracy under different conditions and studying their advantages and drawbacks. A grid-connected photovoltaic system with a nominal power of 6kW is used so as to evaluate the behavior of the synchronization algorithm when the 3-phase utility grid is affected by some disturbances such as voltage unbalances, frequency variations and harmonic distortions. Firstly, several simulations with a disturbed 3-phase utility grid using MATLAB/SIMULINK from The MathWorks, Inc. are shown, and secondly, the previous tests are run in a Real-Time Digital Simulation (RTDS) platform in order to validate the obtained results with simulations.
The present work shows experimental data on the release of some radionuclides that are forming the so-called
ε
particles in the spent nuclear fuel (SNF): Mo, Tc, Ru and Rh. The leaching experiments ...were carried out with a 60 GWd·t
−1
burnup SNF at two different pH values, 8.4 and 13.2, and under oxidizing conditions. The modelling of the data showed that the higher release of Mo, Tc, Ru and Rh at pH 13.2 could be due to the higher dissolution rate of the
ε
-particles.
Graphical abstract
To analyse the characteristics and predictors of death in hospitalized patients with coronavirus disease 2019 (COVID-19) in Spain.
A retrospective observational study was performed of the first ...consecutive patients hospitalized with COVID-19 confirmed by real-time PCR assay in 127 Spanish centres until 17 March 2020. The follow-up censoring date was 17 April 2020. We collected demographic, clinical, laboratory, treatment and complications data. The primary endpoint was all-cause mortality. Univariable and multivariable Cox regression analyses were performed to identify factors associated with death.
Of the 4035 patients, male subjects accounted for 2433 (61.0%) of 3987, the median age was 70 years and 2539 (73.8%) of 3439 had one or more comorbidity. The most common symptoms were a history of fever, cough, malaise and dyspnoea. During hospitalization, 1255 (31.5%) of 3979 patients developed acute respiratory distress syndrome, 736 (18.5%) of 3988 were admitted to intensive care units and 619 (15.5%) of 3992 underwent mechanical ventilation. Virus- or host-targeted medications included lopinavir/ritonavir (2820/4005, 70.4%), hydroxychloroquine (2618/3995, 65.5%), interferon beta (1153/3950, 29.2%), corticosteroids (1109/3965, 28.0%) and tocilizumab (373/3951, 9.4%). Overall, 1131 (28%) of 4035 patients died. Mortality increased with age (85.6% occurring in older than 65 years). Seventeen factors were independently associated with an increased hazard of death, the strongest among them including advanced age, liver cirrhosis, low age-adjusted oxygen saturation, higher concentrations of C-reactive protein and lower estimated glomerular filtration rate.
Our findings provide comprehensive information about characteristics and complications of severe COVID-19, and may help clinicians identify patients at a higher risk of death.
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While the proportion of colon cancer occurring in older patients is expected to increase, these patients may have more complications that may lead to serious consequences. The aim of this study was ...assess postoperative complications and their short-term consequences in colon cancer surgery according to age.
Patients undergoing surgery for primary invasive colon cancer in 22 centers between June 2010 and December 2012 were included. Presurgical and surgical variables were analyzed, and in-hospital major postoperative complications and its most serious consequence (no relevant, transfusion, reintervention, admission to the intensive care unit, or death) were estimated according to age group. Chi-square tests were used to analyze the possible associations between variables and age groups.
Data from 1976 patients, mean (range) age 68 (24-97) years, 62% men, were analyzed; 52.2% were aged > 69 years and 17.7% were aged > 79 years. The complication rate was 25.3%, reaching 30.9% in those aged ≥ 80 years. Older age was associated with a higher rate of postoperative infections during the hospital stay. The most common surgical complication in patients aged > 85 years was dehiscence of the anastomosis (11.5%). About 5% of patients with major complications died in the hospital (11.1% of those aged 80-84 years and 14.3% aged > 85 years). Among patients aged > 85 years, 38.1% required transfusions.
Older patients should receive appropriate functional preparation before the intervention, and when the risks of the intervention outweigh the potential benefits, a nonsurgical approach may be preferable.
Older patients may experience postoperative more complications with serious consequences. This study analyzed in-hospital complications in 1976 patients undergoing surgery for colon cancer. Infections, anastomotic leakage, and cardiorespiratory failure were more common in older patients, while in-hospital mortality was nearly 10 times higher than in younger patients. Oldest patients should receive appropriate multidisciplinary functional preparation before the intervention.
En este artículo se presenta una revisión de los estudios primarios que abordan la identificación de faltas durante el aprendizaje de los diagramas de casos de uso (DCU) y de los diagramas de clase ...(DC) en los últimos 10 años. Este trabajo es el inicio de un proyecto de investigación relacionado con la detección de faltas en los diagramas UML. Este artículo presenta un análisis del estado del arte con respecto a la tipificación de faltas en DCU y DC, con el objetivo de identificar oportunidades y brechas de investigación. Se encontraron 20 documentos de acuerdo con los criterios de inclusión y exclusión establecidos mediante la metodología utilizada para la revisión sistemática de literatura. Considerando la relevancia del tema, se puede observar que es limitada la investigación relacionada con la detección de faltas en los diagramas UML tanto en DCU como DC.
J Oral Pathol Med (2012) 41: 389–393
Although molecular alterations are reported in different types of odontogenic tumours, their pathogenesis remains to be established. Loss of heterozygosity (LOH) ...studies allow the identification of minimal regions of deletions of known or putative tumour suppressor genes, the losses of which may promote neoplastic growth. The purpose of this study was to investigate LOH in a set of odontogenic mixed tumours. Tumour suppressor gene loci on 3p, 9p, 11p, 11q and 17p chromosomes were analysed in five samples of ameloblastic fibroma (AF), three samples of ameloblastic fibro‐odontoma (AFO) and three samples of ameloblastic fibrosarcoma (AFS). The most frequently lost genetic loci were p53 (17p13, 62%) and CHRNB1 (17p13, 55%). LOH at the chromosome regions 3p24.3, 9p22 and 9p22‐p21 was identified only in AFS. No sample showed LOH at the chromosomal loci 3p21.2 and 11q13.4. For the region 9p22–p13, LOH occurred in one sample of AFO. The fractional allelic loss (FAL) was calculated for each sample. The mean FAL of the benign lesions (i.e. AF and AFO) was 22%, whereas the mean FAL of the malignant lesions (i.e. AFS) was 74.6%. In conclusion, our results show a higher FAL in AFS compared to its benign counterparts and reveal a different pattern of LOH of tumour suppressor genes in AFS, which may regulate changes in tumour behaviour.
Resumen La atresia de coana es una rara malformación congénita improbable de encontrar de forma bilateral en un adolescente o adulto. Hasta la fecha, no se ha descrito ningún caso de atresia ...bilateral en un adulto con una malformación asociada de cabeza y cuello que haya requerido tratamiento conjunto. El tratamiento de elección de la atresia de coana bilateral continúa siendo la cirugía endoscópica, con controversia en el uso intraoperatorio de mitomicina o la colocación de stents para evitar estenosis. Lo que no está claro es el orden de tratamiento y la simultaneidad del procedimiento si se asocian otras posibles patologías que tengan una indicación quirúrgica. Presentamos un caso clínico que cumple con todos estos requisitos.
New technologies and eating disorders de Pablo, G. Salazar; McDonagh, J. San Martin; Vallejo, S. Gomez ...
European neuropsychopharmacology,
10/2016, Letnik:
26
Journal Article
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