An Alternative Method to Achieve Metrological Confirmation in Measurement Processes

Metrological confirmation process must be designed and implemented to ensure that metrological characteristics of the measurement system meet metrological requirements of the measurement process. The aim of this paper is to present an alternative method to the traditional metrological requirements about the relationship between tolerance and measurement uncertainty, to develop such confirmation processes. The proposed way to metrological confirmation considers a given inspection task of the measurement process into the manufacturing system, and it is based on the Index of Contamination of the Capability, ICC. Metrological confirmation process is then developed taking into account the producer risks and economic considerations on this index. As a consequence, depending on the capability of the manufacturing process, the measurement system will be or will not be in adequate state of metrological confirmation for the measurement process

Osteoma sinusal

Varón de 36 años sin antecedentes de interés que acude al servicio de urgencias por cefalea frontotemporal derecha intensa, progresiva y de inicio brusco, presenta afasia y ligera desviación de los rasgos faciales. Se realizó una TC craneal sin reconocer afección en el parénquima cerebral, ampliando el estudio a TC de senos paranasales, donde se apreció una masa heterogénea de contornos polilobulados parcialmente calcificada de 46 mm (fig. 1), desde el lóbulo frontal derecho caudalmente afecta a celdas etmoidales ipsilaterales, invadiendo la órbita derecha con afectación de la grasa intraorbitaria y desplazando el músculo recto interno (fig. 2). Las características radiológicas de dicha lesión, eran típicas de osteoma sinusal gigante..

Performance, academic context and self-reported health in psychology students before and after of the EHEA

[EN] The European Higher Education Area (EHEA) has involved a number of structural and methodological changes whose results on academic performance and student health have not been sufficiently studied. The purpose of this paper is to evaluate the performance, perceived context and self-reported health of a sample of undergraduate and graduate Psychology students to see how these variables relate to and influence their academic achievement and welfare. Methodology. The sample consisted of 811 students (487 pre-Bologna system and 324 bacherlor ́s degree). For the evaluation of the indicated variables, the following instruments were used: the Academic Context questionnaire, to evaluate the educational environment; the GHQ-28 questionnaire to evaluate the self-reported health; and the CHAS (Cuestionario de Hábitos de Sueño, in Spanish, Sleeping Habits Questionnaire), in addition, the academic performance was collected. Results. EHEA students perform better than students pre-Bologna, although the difference is not very high. They are also more dissatisfied with the results obtained, they have worse psychological health, worse quality of sleep, greater anxiety and insomnia, greater social dysfunction, in addition, they need more medical leave due to stress and anxiety. Conclusions. Adaptation to the EHEA does not seem to achieve its objectives of improving the quality of education and having a negative impact on the health and physical and psychological well-being of students.[ES] El Espacio Europeo de Educación Superior (EEES) ha implicado una serie de modificaciones a nivel estructural y metodológico cuyos resultados sobre el rendimiento académico y la salud de los estudiantes no se han estudiado suficientemente. El objetivo de este trabajo es evaluar el rendimiento, el contexto percibido y la salud auto informada de una muestra de estudiantes de Psicología de licenciatura y grado, para ver cómo se relacionan estas variables e influyen en sus resultados académicos y bienestar. Metodología. La muestra estuvo compuesta por 811 estudiantes (487 de licenciatura y 324 de grado). Para la evaluación de las variables indicadas se utilizaron los siguientes instrumentos: cuestionario de Contexto Académico, el cuestionario GHQ-28 para evaluar la salud percibida, y el Cuestionario de hábitos de sueño CHAS, además se recabó el rendimiento académico. Resultados. Los estudiantes del EEES obtienen un mejor rendimiento que los de licenciatura, aunque la diferencia no es muy elevada. Así mismo muestran estar más insatisfechos con los resultados obtenidos, tienen peor salud psicológica, peor calidad de sueño, mayor ansiedad e insomnio, mayor disfunción social y más bajas médicas por estrés y ansiedad. Conclusiones. La adaptación al EEES parece que no cumple con sus objetivos de mejora de la calidad de la enseñanza además de tener un impacto negativo en la salud y bienestar físico y psicológico de los estudiantes.López-Núñez, M.; Rubio-Valdehita, S.; Díaz Ramiro, E. (2018). Rendimiento, contexto académico y salud percibida en estudiantes de psicología antes y después del EEES. 211-226. doi:10.4995/redu.2018.8961SWORD21122

Nefrocalcinosis medular

Mujer de 41 años sin antecedentes de interés que acude al servicio de urgencias por fiebre y dolor lumbar izquierdo, diagnosticada previamente de cólico nefrítico sin mejora con el tratamiento. Se realizó ecografía abdominal (fig. 1) presentando riñones simétricos en tamaño y sin ectasia de vías excretoras. Ambos riñones mostraron hiperecogenicidad difusa a nivel medular siendo muy llamativa porque se asemeja a la ecogenicidad que presentan los depósitos cálcicos sin sombra acústica posterior, lo que lo difiere claramente de la hipoecogenicidad presente en la corteza renal..

The effect of minimum quantity lubrication in the intermittent turning of magnesium based on vibration signals

The present work shows an experimental investigation on intermittent turning based on vibration signals. The dependence of vibrations on the feed rate, minimum quantity lubrication (MQL) flow rate and the type of the interruption of the workpiece is evaluated. The results indicate that a part of the vibrations depends on the flow rate of the MQL system and its interaction with the feed rate, finding no dependency on the type of interruption. The influence of the MQL system is greater when machining at the lower feed rate. In addition, a strong relation between surface roughness and vibrations is identified. However, this relation is quite different depending on the environment used. In general, under dry conditions, the higher the vibrations the higher the surface roughness, while the opposite occurs when the MQL system is used.publishe

Glyphosate, Other Herbicides, And Transformation Products In Midwestern Streams, 2002

The use of glyphosate has increased rapidly, and there is limited understanding of its environmental fate. The objective of this study was to document the occurrence of glyphosate and the transformation product aminomethylphosphonic acid (AMPA) in Midwestern streams and to compare their occurrence with that of more commonly measured herbicides such as acetochlor, atrazine, and metolachlor. Water samples were collected at sites on 51 streams in nine Midwestern states in 2002 during three runoff events: after the application of pre-emergence herbicides, after the application of post-emergence herbicides, and during harvest season. All samples were analyzed for glyphosate and 20 other herbicides using gas chromatography/mass spectrometry or high performance liquid chromatography/mass spectrometry. The frequency of glyphosate and AMPA detection, range of concentrations in runoff samples, and ratios of AMPA to glyphosate concentrations did not vary throughout the growing season as substantially as for other herbicides like atrazine, probably because of different seasonal use patterns. Glyphosate was detected at or above 0.1 μg/l in 35 percent of pre-emergence, 40 percent of post-emergence, and 31 percent of harvest season samples, with a maximum concentration of 8.7 μg/l. AMPA was detected at or above 0.1 μg/l in 53 percent of pre-emergence, 83 percent of post-emergence, and 73 percent of harvest season samples, with a maximum concentration of 3.6 μg/l. Glyphosate was not detected at a concentration at or above the U.S. Environmental Protection Agency’s maximum contamination level (MCL) of 700 μg/l in any sample. Atrazine was detected at or above 0.1 μg/l in 94 percent of pre-emergence, 96 percent of postemergence, and 57 percent of harvest season samples, with a maximum concentration of 55 μg/l. Atrazine was detected at or above its MCL (3 μg/l) in 57 percent of pre-emergence and 33 percent of postemergence samples

Experimental analysis of direct thermal methane cracking

The analysis of the viability of Hydrogen production without CO2 emissions is one of the most challenging activities that have been initiated for a sustainable energy supply. As one of the tracks to fulfil such objective, direct methane cracking has been analysed experimentally to assess the scientific viability and reaction characterization in a broad temperature range, from 875 to 1700 ?C. The effect of temperature, sweeping/carrier gas fraction proposed in some concepts, methane flow rate, residence time, and tube material and porosity has been analysed. The aggregation of carbon black particles to the reaction tube is the main technological show-stopper that has been identified