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Search Results: 1 - 10 of 201335 matches for " Christina Vallén "
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Validity and user-friendliness of the minimal eating observation and nutrition form – version II (MEONF – II) for undernutrition risk screening
Christina Vallén,Peter Hagell,Albert Westergren
Food & Nutrition Research , 2011, DOI: 10.3402/fnr.v55i0.5801
Abstract: Objective: To analyze the criterion-related validity and user-friendliness of the Minimal Eating Observation and Nutrition Form – Version II (MEONF – II) and Malnutrition Universal Screening Tool (MUST) in relation to the Mini Nutritional Assessment (MNA). In addition, the effect of substituting body mass index (BMI) with calf circumference (CC) was explored for the MEONF-II. Methods: The study included 100 patients who were assessed for nutritional status with the MNA (full version), considered here to be the gold standard, and screened with the MUST and the MEONF-II. The MEONF-II includes assessments of involuntary weight loss, BMI (or calf circumference), eating difficulties, and presence of clinical signs of undernutrition. Results: The MEONF-II sensitivity (0.73) and specificity (0.88) were acceptable. Sensitivity and specificity for the MUST were 0.57 and 0.93, respectively. Replacing the BMI with CC in the MEONF-II gave similar results (sensitivity 0.68, specificity 0.90). Assessors considered MEONF-II instructions and items to be relevant, easy to understand and complete (100%), and the questions to be relevant (98%). MEONF-II and MUST took 8.8 and 4.7 minutes to complete, respectively, and both were considered relevant and easy to finish. In addition, MEONF-II was thought to reveal problems that allows for nursing interventions. Conclusions: The MEONF-II is an easy to use, relatively quick, and sensitive screening tool to assess risk of undernutrition among hospital inpatients, which allows for substituting BMI with CC in situations where measures of patient height and weight cannot be easily obtained. High sensitivity is of primary concern in nutritional screening and the MEONF-II outperforms the MUST in this regard.
Cut-off scores for the Minimal Eating Observation and Nutrition Form – Version II (MEONF-II) among hospital inpatients
Albert Westergren,Erika Norberg,Christina Vallén,Peter Hagell
Food & Nutrition Research , 2011, DOI: 10.3402/fnr.v55i0.7289
Abstract: The newly developed Minimal Eating Observation and Nutrition Form – Version II (MEONF-II) has shown promising sensitivity and specificity in relation to the Mini Nutritional Assessment (MNA). However, the suggested MEONF-II cut-off scores for deciding low/moderate and high risk for undernutrition (UN) (>2 and >4, respectively) have not been decided based on statistical criteria but on clinical reasoning. The objective of this study was to identify the optimal cut-off scores for the MEONF-II in relation to the well-established MNA based on statistical criteria.Cross-sectional study.The study included 187 patients (mean age, 77.5 years) assessed for nutritional status with the MNA (full version), and screened with the MEONF-II. The MEONF-II includes assessments of involuntary weight loss, Body Mass Index (BMI) (or calf circumference), eating difficulties, and presence of clinical signs ofUN. MEONF-II data were analysed by Receiver Operating Characteristics (ROC) curves and the area under the curve (AUC); optimal cut-offs were identified by the Youden index (J=sensitivity + specificity–1).According to the MEONF-II, 41% were at moderate or high UN risk and according to the MNA, 50% were at risk or already undernourished. The suggested cut-off scores were supported by the Youden indices. The lower cut-off for MEONF-II, used to identify any level of risk for UN (>2; J=0.52) gave an overall accuracy of 76% and the AUC was 80%. The higher cut-off for identifying those with high risk for UN (>4; J=0.33) had an accuracy of 63% and the AUC was 70%.The suggested MEONF-II cut-off scores were statistically supported. This improves the confidence of its clinical use.
Creating a “Faraday Ghost” inside the Rotation Measure Synthesis Technique, through a Wide Observational “Gap” in Wavelength Coverage  [PDF]
Jacques P. Vallée
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.32011

Several recently published Faraday rotation measures (RM) derived using the novel RM synthesis technique are likely in error. If a set of polarimetric observations contains a large gap in the wavelength coverage, the rotation measure determination is sometimes ambiguous; this is also true even when two long wavelength ranges are observed but are separated by a wide gap. Essentially, there are 180° ambiguities in the observed Position Angle of the electric polarisation vector between the two wavelength ranges; these ambiguities are not resolved because the extent of wavelengths2 covered, within each of the two ranges, is too small to uniquely determine the RM in isolation. We find that unphysical “Faraday ghosts” can be mathematically constructed with a np ambiguity (±180° times an integer) at predictable polarization position angles when using only two wavelength ranges separated by a gap, as a function of the width of the gap (Equation (4)). Our computations suggest an empirical correlation between an observational gap between two wavelength ranges and the appearance of “Faraday ghosts”.

A Synthesis of Fundamental Parameters of Spiral Arms, Based on Recent Observations in the Milky Way  [PDF]
Jacques P. Vallée
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.31003

Recent advances in the position and shape of each spiral arm in the Milky Way (pitch angle, shape, number, inter-arm separation at the Sun) are evaluated and compared, and a statistical analysis yields an updated idealized Galactic map. Earlier tabular results were published in five blocks of 15 to 20 each, covering 1980 to 2007 [1-4]. This paper presents the latest two blocks, each between 15 and 20 entries of published spiral arm researches since 2008. Using this revised Galactic map, and a discussion on the width of the Sagittarius arm (major or minor or equal), an interpretation of orbital streamlines for the gas and magnetic fields is presented for 2 major arms and for 4 major arms in the Milky Way. Our interpretation for all the recent data favors the following: a four-arm non-circular spiral pattern for the Milky Way; the Sagittarius arm being likely an equal arm; the inter-arm separation at the Sun’s location converging near 3.0 kpc. We emphasize that these conclusions encompass all the data, and thus can vary somewhat from the results of data obtained from a single filter (only CO data, say).

Heat, Resolvent and Wave Kernels with Multiple Inverse Square Potential on the Euclidian Space Rn  [PDF]
Mohamed Vall Ould Moustapha
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.516249
Abstract: In this paper, the heat, resolvent and wave kernels associated to the Schr?dinger operator with multi-inverse square potential on the Euclidian space Rn are given in explicit forms.
Optical response of a single gold nanoparticle
N. Del Fatti,D. Christofilos,F. Vallée,Dimitris Christofilos
Gold Bulletin , 2008, DOI: 10.1007/BF03216592
Abstract: Optical detection and spectroscopy of single gold nanoparticles using the spatial-modulation spectroscopy technique is described, focusing on the connection between the nanoparticle and environment parameters with the measured linear optical extinction spectrum. Characterisation of the size, shape and orientation on the substrate of a nanoparticle through quantitative determination of its optical extinction cross-section spectrum is illustrated in the case of gold nanospheres and nanorods. Extension of this technique to ultrafast nonlinear spectroscopy of a single gold nanoparticle is also discussed.
Nonlinear dynamics of soft fermion excitations in hot QCD plasma III: Soft-quark bremsstrahlung and energy losses
Markov, Yu. A.;Markova, M. A.;Vall, A. N.
High Energy Physics - Phenomenology , 2008, DOI: 10.1142/S0217751X10047701
Abstract: In general line with our early works [Yu.A. Markov, M.A. Markova, Nucl. Phys. A770 (2006) 162; 784 (2007) 443] within the framework of a semiclassical approximation the general theory of calculation of effective currents and sources generating bremsstrahlung of an arbitrary number of soft quarks and soft gluons at collision of a high-energy color-charged particle with thermal partons in a hot quark-gluon plasma, is developed. For the case of one- and two-scattering thermal partons with radiation of one or two soft excitations, the effective currents and sources are calculated in an explicit form. In the model case of `frozen' medium, approximate expressions for energy losses induced by the most simple processes of bremsstrahlung of soft quark and soft gluon, are derived. On the basis of a conception of the mutual cancellation of singularities in the sum of so-called `diagonal' and `off-diagonal' contributions to the energy losses, an effective method of determining color factors in scattering probabilities, containing the initial values of Grassmann color charges, is suggested. The dynamical equations for Grassmann color charges of hard particle used by us early are proved to be insufficient for investigation of the higher radiative processes. It is shown that for correct description of these processes the given equations should be supplemented successively with the higher-order terms in powers of the soft fermionic field.
El derecho a la información del paciente : una aproximación legal y deontológica
Vall Casas, Aurora,Rodríguez Parada, Concepción
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2008, DOI: 10.1344/105.000000324
Abstract: Objetivo: presentar el estado de la cuestión sobre el reconocimiento del ejercicio del derecho a la información de los pacientes en la legislación y en los códigos deontológicos de médicos y bibliotecarios de diversos países de Europa Occidental: Bélgica, Francia, Italia Espa a (y Catalu a), Suiza y Reino Unido. Metodología: identificación, localización y análisis de las leyes y códigos deontológicos actualmente vigentes en relación con el derecho a la información de los pacientes. Se han desestimado cuestiones como el acceso a la historia clínica, las voluntades anticipadas o el consentimiento informado. Conclusiones: es un tema de máxima actualidad. El bibliotecario debe colaborar junto con el personal medicosanitario en el proceso de informar al paciente. La totalidad de normas, leyes y códigos analizados contemplan la garantía de acceso a la información.
Recursos d'informació i lleure per a infants malalts
Rodríguez Parada, Concepción,Vall Casas, Aurora
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2007,
Abstract: Recopilació de recursos digitals d'informació i d'oci adre ats a infants hospitalitzats i a les seves famílies. De cada recurs es fa una descripció de l'organització que el promou i dels seus objectius.Recopilación de recursos digitales de información y de ocio dirigidos a ni os hospitalizados y a sus familias. De cada recurso se hace una descripción de la organización que lo promueve y de sus objetivos.A compilation of digital resources for information and play activities for hospitalized children and their families. For each resource, we present an outline of the organization that promotes it and its objectives.
Informe de les 10es Jornades Catalanes d Informació i Documentació (Barcelona, 25 i 26 de maig de 2006)
Rodríguez Parada, Concepción,Vall Casas, Aurora
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2006,
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