69 research outputs found
El abandono escolar de adolescentes en España
El abandono escolar sigue siendo una realidad presente entre los adolescentes de
la sociedad actual en la que la familia y la escuela ocupan un papel prioritario, tanto
positiva como negativamente. Tanto es asà que datos recientes revelan que España es, en
el año 2021, el sexto paĂs con mayor tasa de abandono escolar. Tras el estudio de las
caracterĂsticas del adolescente actual, los riesgos a los que se expone, las causas del
abandono y las diferencias entre las Comunidades Autónomas de España, se presenta
una propuesta de intervenciĂłn para prevenir y hacer frente al abandono escolar,
sugiriendo una serie de acciones o recomendaciones que pueden llevarse a cabo desde la
familia y la escuela para prevenir o mitigar dicho fenĂłmeno.School dropout continues to be a reality among adolescents in today's society in
which the family and the school play a priority role, both positively and negatively. So
much so that recent data reveal that Spain is, in the year 2021, the sixth country with the
highest school dropout rate. After studying the characteristics of today's adolescents, the
risks to which they are exposed, the causes of dropout and the differences between the
Autonomous Communities of Spain, is presented a proposal for intervention to prevent
and deal with school dropout, suggesting a series of actions or recommendations that
can be carried out by the family and the school to prevent or mitigate this phenomenon
Extension of Incremental Linear Discriminant Analysis to Online Feature Extraction under Nonstationary Environments
In this paper, a new approach to an online feature extraction under nonstationary environments is proposed by extending Incremental Linear Discriminant Analysis (ILDA). The extended ILDA not only detect so-called “concept drifts” but also transfer the knowledge on discriminant feature spaces of the past concepts to construct good feature spaces. The performance of the extended ILDA is evaluated for the benchmark datasets including sudden changes and reoccurrence in concepts
Reproducibility of hemodynamic, cardiac autonomic modulation and blood flow assessments in patients with intermittent claudication
Objective: To identify, in patients with peripheral artery disease and intermittent claudication (IC), the reproducibility of heart rate (HR), blood pressure (BP), rate pressure product (RPP), heart rate variability (HRV), and forearm and calf blood flow (BF) and vasodilatory assessments.
Methods: Twenty-nine patients with IC underwent test and retest sessions, 8-12 days apart. During each session, HR, BP, HRV, BF and vasodilatory responses were measured by electrocardiogram, auscultation, spectral analysis of HRV (low frequency, LFR-R; high frequency, HFR-R) and strain gauge plethysmography (baseline BF, post-occlusion BF, post-occlusion area under the curve, AUC). Reproducibility was determined by intraclass coefficient correlation (ICC), typical error, coefficient of variation (CV) and limits of agreement.
Results: The ICC for HR and BP were > 0.8 with CV 0.9 while CV were 0.9 while CV were < 19%; variable ICC and CV for vasodilatory responses were exhibited for calf (0.653 – 0.770; 35.2 – 37.7%) and forearm (0.169 – 0.265; 46.2 – 55.5%).
Conclusions: In male patients with IC, systemic hemodynamic (HR and BP), cardiac autonomic modulation (LFR-R and HFR-R) and forearm and calf baseline BF assessments exhibited excellent reproducibility, whereas the level of reproducibility for vasodilatory responses were moderate to poor. Assessment reproducibility has highlighted appropriate clinical tools for the regular monitoring of disease/intervention progression in patients with IC
Cowpea symbiotic efficiency, pH and aluminum tolerance in nitrogen-fixing bacteria
Cowpea (Vigna unguiculata) cultivation in northern and northeastern Brazil provides an excellent source of nutrients and carbohydrates for the poor and underprivileged. Production surplus leads to its consumption in other regions of Brazil and also as an export commodity. Its capacity to establish relationships with atmospheric nitrogen-fixing bacteria is crucial to the reduction of production costs and the environmental impact of nitrogen fertilizers. This study assessed the symbiotic efficiency of new strains of symbiotic nitrogen-fixing bacteria with cowpea and their tolerance to pH and aluminum. Twenty-seven strains of bacteria from different soils were evaluated under axenic conditions. These strains were compared to the following inoculant strains: INPA03-11B, UFLA03-84 and BR3267 and two controls that were not inoculated (with and without mineral nitrogen). Six strains and the three strains approved as inoculants were selected to increase the dry weight production of the aerial part (DWAP) and were tested in pots with soil that had a high-density of nitrogen-fixing native rhizobia. In this experiment, three strains (UFLA03-164, UFLA03-153, and UFLA03-154) yielded higher DWAP values. These strains grow at pH levels of 5.0, 6.0, 6.8 and at high aluminum concentration levels, reaching 10(9) CFU mL-1. In particular UFLA03-84, UFLA03-153, and UFLA03-164 tolerate up to 20 mmol c dm-3 of Al+3. Inoculation with rhizobial strains, that had been carefully selected according to their ability to nodulate and fix N2, combined with their ability to compete in soils that are acidic and contain high levels of Al, is a cheaper and more sustainable alternative that can be made available to farmers than mineral fertilizers
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