Reglage métier rectiligne et leur influence sur la longueur de fil par maille

La característica más singular de los tejidos de malla es su extensibilidad. Esta extensibilidad conlleva una deformación del tejido y, por tanto, un cambio de sus dimensiones originales. Las densidades y el peso dependerán del estado de tensión en que se mida el tejido, sin embargo, la longitud de malla es un parámetro estructural que permanece invariante sea cual sea el estado del tejido en crudo. Este trabajo, analiza, en primer lugar, las diferencias entre varios métodos manuales para medir esta longitud y, después, se verifica la relación funcional entre las densidades del punto liso y la longitud de malla para unas determinadas condiciones industriales de trabajo.The most defining characteristic of knitted fabrics is their stretchability, which tends to cause deformations in the fabric and, consequently, changes in their dimensions. The densities and weight depend on the stress state of fabric ,however, the length absorbed by stitch (LAS) is a structural parameter which remains unaltered regardless of the state of the fabric (in its raw state) Firstly, this work analyses the differences between various simple methods for determining this length. Secondly, the functional relationship between the densities of the plain structure and the LAS is analysed for given industrial working conditions.La caractéristique la plus singulière des tissus à mailles est leur extensibilité qui entraîne généralement une déformation du tissu et, par conséquent, des changements dans leurs dimensions. Les densités et le poids dépendront d l´état de tension du tissu ; toutefois, la longueur de fil absorbée par une maille est un para mètre structural qui demeure inaltéré quel que soit l´état dans lequel se trouve le tissu écru. Ce travail analyse, en premier lieu, les différences entre plusieurs méthodes simples pour déterminer cette longueur et vérifier le rapport fonctionnel entre les densités du jersey et la longueur de fil par maille pour certaines conditions industrielles de travail

Estudi de les preferències dels alumnes en la gamificació

L'interès d'aquest treball prové del fet que el projecte de la unitat didàctica realitzada consisteix precisament en la creació d'un joc creat pels alumnes, mitjançant Scratch. Es parteix d'una situació en la qual es desconeixen les preferències de gamificació de l'alumnat, i a partir d'aquí es defineix una sèrie de processos (enquestes, formularis, entrevistes, etc.) mitjançant els quals s'obté informació d'aquestes preferències. Es preveu recopilar informació sobre la forma d'obtenció de dades i enquestes, la preparació d'aquestes, la realització de la consulta i la seva documentació. En aquest projecte els alumnes adquiriran competències dels continuts de l'àmbit Científic-tecnològic de Tecnologia de 2n de l'ESO (Blocs: Llenguatges de Programació, El procès tecnològic) utilitzant el llenguatge de programació Scratch. S'aplicaran metodologies de treball per projectes de manera cooperativa. L'entorn de scratch permet compartir les seves creacions, per tant els permet compartir informació i aprendre competències de manera conjunta. Un cop hagin realitzat el joc (del seu propi disseny i creació), el compartiran amb els companys, els provaran i s'avaluaran entre ells. Durant les primeres sessions s'ensenyarà el funcionament de la programació scratch i posteriorment es formaran els grups. Cada grup escollirà el tema i la dinàmica del joc i finalment es realitzarà el joc. En les últimes sessions es compartiran els projectes i es donaran retroacció entre ells

Influence de l'aiguille de coudre sur la pénétration de tissus "Denim"

Se estudia la fuerza de penetración en una serie de tejidos “denim” con el comprobador de costurabilidad L&M. Se estudia la influencia del número de capas, la dirección de costura, título de la aguja y forma de la punta. Se ha aplicado un diseño factorial mixto para cada uno de los tejidos analizados. A partir de los efectos principales y las interacciones se derivan las condiciones de cosido más favorables.The penetration force is studied in a series of weaves " denim " with the sewability tester L&M. It is studied the influence of the number of layers, the direction of the seam, size of the needle and form of the point. A mixed factorial design has been applied for each one of the analyzed fabrics. Starting from the main effects and the interactions are derived the conditions of sewing more favorable.La force de la pénétration est étudiée dans une série de tissus " denim" avec le vérificateur L&M tester. Il est étudié l'influence du nombre de couches, la direction de la couture, diamètre de l'aiguille et forme de la pointe. Un dessin factoriel mixte a été sollicité chacun des structures analysées. Après des effets principaux et les interactions est dérivé les conditions plus favorables pour les coutures utilisées sur les tissus

Room-temperature coercivity enhancement in mechanically alloyed antiferromagnetic-ferromagnetic powders

This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.The coercivity,HC, and squareness of Co powders have been enhanced at room temperature by mechanically alloying them with antiferromagneticpowders with Néel temperature, TN, above room temperature. The enhancement is maximum after field annealing above TN. The existence of loop shifts and the dependence of HC on the annealing and measuring temperatures indicate that exchange bias effects are responsible for this behavior

Perception of quality of care of patients with potentially severe diseases evaluated at a distinct quick diagnostic delivery model: a cross-sectional study

Background: Although hospital-based outpatient quick diagnosis units (QDU) are an increasingly recognized cost-effective alternative to hospitalization for the diagnosis of potentially serious diseases, patient perception of their quality of care has not been evaluated well enough. This cross-sectional study analyzed the perceived quality of care of a QDU of a public third-level university hospital in Barcelona. Methods: One hundred sixty-two consecutive patients aged ≥ 18 years attending the QDU over a 9-month period were invited to participate. A validated questionnaire distributed by the QDU attending physician and completed at the end of the first and last QDU visit evaluated perceived quality of care using six subscales. Results: Response rate was 98%. Perceived care in all subscales was high. Waiting times were rated as 'short'/'very short' or 'better'/'much better' than expected by 69-89% of respondents and physical environment as 'better'/'much better' than expected by 94-96 %. As to accessibility, only 3% reported not finding the Unit easily and 7% said that frequent travels to hospital for visits and investigations were uncomfortable. Perception of patient-physician encounter was high, with 90-94% choosing the positive extreme ends of the clinical information and personal interaction subscales items. Mean score of willingness to recommend the Unit using an analogue scale where 0 was 'never' and 10 'without a doubt' was 9.5 (0.70). On multivariate linear regression, age >65 years was an independent predictor of clinical information, personal interaction, and recommendation, while age 18-44 years was associated with lower scores in these subscales. No schooling predicted higher clinical information and recommendation scores, while university education had remarkable negative influence on them. Having ≥4 QDU visits was associated with lower time to diagnosis and recommendation scores and malignancy was a negative predictor of time to diagnosis, clinical information, and recommendation. Discussion: It is worthy of note that the questionnaire evaluated patient perception and opinions of healthcare quality including recommendation rather than simply satisfaction. It has been argued that perception of quality of care is a more valuable approach than satisfaction. In addition to embracing an affective dimension, satisfaction appears more dependent on patient expectations than is perception of quality. Conclusions: While appreciating that completing the questionnaire immediately after the visit and its distribution by the QDU physician may have affected the results, scores of perceived quality of care including recommendation were high. There were, however, significant differences in several subscales associated with age, education, number of QDU visits, and diagnosis of malignant vs. benign condition

Determination of total polyphenol index in wines employing a voltammetric electronic tongue

This work reports the application of a voltammetric electronic tongue system (ET) made from an array of modified graphite-epoxy composites plus a gold microelectrode in the qualitative and quantitative analysis of polyphenols found in wine. Wine samples were analyzed using cyclic voltammetry without any sample pretreatment. The obtained responses were preprocessed employing discrete wavelet transform (DWT) in order to compress and extract significant features from the voltammetric signals, and the obtained approximation coefficients fed a multivariate calibration method (artificial neural network-ANN-or partial least squares-PLS-) which accomplished the quantification of total polyphenol content. External test subset samples results were compared with the ones obtained with the Folin-Ciocalteu (FC) method and UV absorbance polyphenol index (I₂₈₀) as reference values, with highly significant correlation coefficients of 0.979 and 0.963 in the range from 50 to 2400 mg L⁻¹ gallic acid equivalents, respectively. In a separate experiment, qualitative discrimination of different polyphenols found in wine was also assessed by principal component analysis (PCA)

Megalencephalic leukoencephalopathy with subcortical cysts protein 1 regulates glial surface localization of GLIALCAM from fish to humans

Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a leukodystrophy characterized by myelin vacuolization and caused by mutations in MLC1 or GLIALCAM. Patients with recessive mutations in either MLC1 or GLIALCAM show the same clinical phenotype. It has been shown that GLIALCAM is necessary for the correct targeting of MLC1 to the membrane at cell junctions, but its own localization was independent of MLC1 in vitro. However, recent studies in Mlc1−/− mice have shown that GlialCAM is mislocalized in glial cells. In order to investigate whether the relationship between Mlc1 and GlialCAM is species-specific, we first identified MLC-related genes in zebrafish and generated an mlc1−/− zebrafish. We have characterized mlc1−/− zebrafish both functionally and histologically and compared the phenotype with that of the Mlc1−/− mice. In mlc1−/− zebrafish, as in Mlc1−/− mice, Glialcam is mislocalized. Re-examination of a brain biopsy from an MLC patient indicates that GLIALCAM is also mislocalized in Bergmann glia in the cerebellum. In vitro, impaired localization of GlialCAM was observed in astrocyte cultures from Mlc1−/− mouse only in the presence of elevated potassium levels, which mimics neuronal activity. In summary, here we demonstrate an evolutionary conserved role for MLC1 in regulating glial surface levels of GLIALCAM, and this interrelationship explains why patients with mutations in either gene (MLC1 or GLIALCAM) share the same clinical phenotyp

Effects of Sigma-1 Receptor Ligands on Peripheral Nerve Regeneration

Peripheral nerve injuries lead to the loss of motor, sensory and autonomic functions in the territories supplied by the injured nerve. Currently, nerve injuries are managed by surgical repair procedures, and there are no effective drugs in the clinic for improving the capacity of axonal regeneration. Sigma-1 receptor (Sig-1R) is an endoplasmic reticulum chaperon protein involved in many functions, including neuroprotection and neuroplasticity. A few previous studies using Sig-1R ligands reported results that suggest this receptor as a putative target to enhance regeneration. The aim of this study was to evaluate the possible effects of Sig-1R ligands on axonal regeneration in a sciatic nerve section and repair model in mice. To this end, mice were treated either with the Sig-1R agonist PRE-084 or the antagonist BD1063, and a Sig-1R knock-out (KO) mice group was also studied. The electrophysiological and histological data showed that treatment with Sig-1R ligands, or the lack of this protein, did not markedly modify the process of axonal regeneration and target reinnervation after sciatic nerve injury. Nevertheless, the nociceptive tests provided results indicating a role of Sig-1R in sensory perception after nerve injury, and immunohistochemical labeling indicated a regulatory role in inflammatory cell infiltration in the injured nerve