Search results for "PreP"
showing 10 items of 1334 documents
Leadership styles and their specific correlation to gender - theoretical standpoint
2016
The purpose of the research is to review different leadership styles and get insight about specific female and male leadership style characteristics. In this context the development of conception of the changing role of females has been discussed and compared with the Western and Eastern European approach. Different leadership styles and their specific characteristics have been described, compared and evaluated in respect to gender roles. It was found out that female and male incline different leadership styles. Concentration of power and central decision-making which are seen as male leadership characteristics are effective during critical economic situations. Care, empathy and harmonic re…
Automatic Segmentation and Enhancement of Pavement Cracks Based on 3D Pavement Images
2019
Pavement cracking is a significant symptom of pavement deterioration and deficiency. Conventional manual inspections of road condition are gradually replaced by novel automated inspection systems. As a result, a great amount of pavement surface information is digitized by these systems with a high resolution. With pavement surface data, pavement cracks can be detected using crack detection algorithms. In this paper, a fully automated algorithm for segmenting and enhancing pavement crack is proposed, which consists of four major procedures. First, a preprocessing procedure is employed to remove spurious noise and rectify the original 3D pavement data. Second, crack saliency maps are segmente…
La educación ambiental y el desarrollo sostenible: conceptualización del profesorado de formación inicial de secundaria
2008
Después de más de 30 años de hacer esfuerzos para implantar la EA, en el año 2005 se instituye la Década de la Educación para el Desarrollo Sostenible. Esto puede ser una buena ocasión para relanzar la EA, pero para que sea así, ha de asumirse por el profesorado. Nos planteamos en que medida la proclamación de la Década está teniendo repercusiones reales o simplemente ha sido un mensaje de buena voluntad lanzado por las Instituciones. Una forma de saberlo es analizar la concepción que futuros docentes tienen respecto a los términos de Educación Ambiental y Desarrollo Sostenible. El trabajo de investigación que se presenta, es el resultado de un estudio sobre la concepción de los términos Ed…
¿Qué escuelas de Geografía para educar en ciudadanía?
2010
Los cambios sociales y tecnológicos que se han producido en el inicio del tercer milenio han obligado a replantearse las metas educativas. La geografía escolar, institucionalizada en el siglo XIX y XX, no es útil para responder a los nuevos retos ciudadanos. Sin embargo, las rutinas escolares y la opinión pública resisten a las innovaciones académicas; por eso es preciso cambiar la mentalidad tradicional desde el análisis riguroso de la selección de los contenidos didácticos. Para esta tarea los proyectos curriculares son un instrumento relevante.
An evaluation of the efficiency of French higher education: the case of scientific preparatory classes
2007
Looking at the famous French elite preparatory programmes called « Classes préparatoires aux grandes écoles » (CPGE), this research aimed to study the effectiveness of their training. The objective was to know if students from science CPGE develop specific behaviours that lead them to a better academic achievement in further engineering programmes (internal effectiveness) and a better professional career after graduation (external effectiveness). For comparison needs, the empirical approach focused on engineering schools enrolling both students from CPGE and students from other two-year programmes (DEUG, DUT, BTS). For assessing internal effectiveness, two surveys have been conducted; one d…
Development and optimization of confirmatory liquid chromatography—Orbitrap mass spectrometry method for the determination of 17 anticoccidials in po…
2018
A new sensitive and selective multi-residue method based on liquid chromatography - Orbitrap high resolution mass spectrometry (LC-Orbitrap-HRMS) was developed and validated for the determination of 17 anticoccidials in poultry and eggs. Instrumental parameters were optimized by the means of statistical experimental designs to improve the sensitivity, precision, and repeatability of the method. Further optimization of auto-tuned MS parameters led to an increase of signal intensity by 10% to 99% for 16 out of 17 analytes. The sample preparation procedure included extraction from muscle tissue and egg samples with acetonitrile, followed by preconcentration, reconstitution, and filtration. Val…
Processes during preparation of lead/acid battery positive plates from tetrabasic lead sulfate (4BS) pastes
1993
Abstract Tthe processes studied during this investigation were paste mixing and curing. Tetrabasic lead sulfate 4BS pastes were prepared by solution and paste methods both from α-PbO and mill oxides, and the development of 4BS was carried out already during the paste mixing stage. the 4BS pastes were characterized by SEM, TEM, XRD and wet-chemical methods, and the results were compared with those obtained from the characterization of corresponding tribasic lead sulfate (3BS) pastes. The preparation method was found to be one dominating factor affecting both the morphology and structure of 4BS active masses. The selection of raw material gave an additional effect on the morphology. Additiona…
Preliminary application of thermoluminescence and single aliquot regeneration method for dose reconstruction in soda lime glass
2013
The research described in this paper shows that the use of the single aliquot regeneration (SAR) method for thermoluminescence (TL) measurements applied to soda lime glasses allows to carry out a retrospective dose evaluation. We have followed a fast and efficient sample preparation procedure which permits measurements without powdering and sieving processes. We have analyzed the TL signal of commercial soda lime watch glass irradiated with 6 Mega Volts (MV) LINAC photons, 10 MeV LINAC electrons and 62 MeV protons. After the initial exposure and following TL reading, the samples are successively irradiated with increasing doses of photons. Therefore, for each sample its calibration curve is…
Similarities and differences between crystal and enzyme environmental effects on the electron density of drug molecules
2021
Abstract The crystal interaction density is generally assumed to be a suitable measure of the polarization of a low‐molecular weight ligand inside an enzyme, but this approximation has seldomly been tested and has never been quantified before. In this study, we compare the crystal interaction density and the interaction electrostatic potential for a model compound of loxistatin acid (E64c) with those inside cathepsin B, in solution, and in vacuum. We apply QM/MM calculations and experimental quantum crystallography to show that the crystal interaction density is indeed very similar to the enzyme interaction density. Less than 0.1 e are shifted between these two environments in total. Howeve…
T-wave alternans analysis improvement by means of curve alignment prior to distance calculation.
2007
Tracking of repolarization instabilities in the ECG, such as T-wave alternans (TWA), has become a popular non-invasive method to assess the vulnerability to malignant arrhythmic events. These instabilities are usually characterized by small amplitude changes and their measurement is difficult due to the presence of noise and artifacts. Several methods have been recently proposed to address this problem. Most of them are based on amplitude analysis of beat-to-beat alternation of the T wave. This paper describes a preprocessing stage intended to be used prior to amplitude analysis and aimed at improving the alignment between consecutive T waves. This increases the accuracy of the difference c…