Search results for "ABR"
showing 10 items of 1669 documents
Theoretical and experimental study of novel types of solid oxide fuel cell electrodes
2016
Master's thesis Renewable Energy ENE500 - University of Agder 2016 Solid oxide fuel cells (SOFCs) have the potential to become one of the efficient and costeffective system for direct conversion of a wide variety of fuels to electricity. The performance, stability and durability of SOFCs depend strongly on the materials used for the fabrication of electrodes as well as the fabrication process. For anode supported SOFCs, the tape casting method has been the de facto standard for constructing cell components. Furthermore, organic solvents such as ethanol, propanol, terpineol and poly-ethers are generally used in industrial tape casting as the solvent medium to make the chemical slurries out o…
El mito aéreo en el futurismo italiano:del periodo heroico a la espiritualidad aérea (1909-1944) The aerial myth of Itanian futurism: from the heroic…
2021
La poética de lo aéreo atravesó transversalmente la historia del futurismo italiano. El undécimo punto de su manifiesto y fundación en 1909, hizo referencia al aeroplano como una máquina esencial para comprender que la vida y el arte se debían someter a un mundo en permanente transformación. Lo aéreo y sus implicaciones compusieron proclamas y manifiestos determinando la creación literaria y artística del periodo heroico. En los años treinta, cuando el futurismo planteaba su supervivencia en el complejo contexto social y político italiano, la aeropintura se convirtió en su línea oficial. Un perfil que, desde ese mismo momento, se bifurcó en dos tendencias complementarias: la dedicada a una …
Why does the APA recommend the use of serif fonts?
2013
Antecedentes: las normas de publicación de la American Psychological Association recomiendan el uso de un tipo de letra con serif en los manuscritos (Times New Roman). Sin embargo, no parece haber ninguna razón bien sustentada por la que las fuentes con serif produzcan ventaja alguna durante la lectura de palabras. Método: para examinar el papel de los serifs se realizó un experimento en el que se presentaron frases bien con una fuente serif o sansserif de la misma familia, mientras se registraban los movimientos oculares de los participantes. Resultados: los resultados no revelaron diferencias debidas al tipo de letra en los movimientos oculares, a excepción de un efecto mínimo en el númer…
Evaluation of waterborne exposure to heavy metals in innate immune defences present on skin mucus of gilthead seabream (Sparus aurata)
2015
Aquatic animals are continuously exposed to chemical pollutants but the effects evoked in skin surfaces, which receive the most direct contact with them, are poorly investigated. Terminal carbohydrate composition and immunological components present in skin mucus of gilthead seabream (Sparus aurata L.) specimens exposed to waterborne sublethal dosages of heavy metals [arsenic (As2O3), cadmium (CdCl2) and mercury (CH3HgCl) at 5, 5 and 0.04 μM, respectively for 2, 10 and 30 days were analysed. Moreover, the presence of a fucose binding lectin (FBL) was evaluated by western blot and the protein profiles were by SDS-PAGE and HPLC. Results showed little effects of heavy metals in the presence of…
Single-mode Bragg gratings in tapered few-modes and multimode fibers
2019
We propose the implementation of fiber Bragg gratings in tapered few-mode and multimode fibers to accomplish single-mode operation by reducing the core diameter, while preserving the core-cladding structure. The gratings present a single reflection band, and the device shows low insertion losses after the taper fabrication and the fiber Bragg gratings inscription. The excitation of high-order odd modes in the core of the fiber has been identified as the main loss mechanism; it can be prevented by means of symmetric illumination of the fibers. We also demonstrate the excitation of high-order cladding modes (cladding-air modes) along the taper transitions; these modes can be removed without a…
Predicting mechanical behaviour and damage kinetics of a 3D interlock composite materials by using a multiscale approach
2012
International audience; The present work aims to investigate the mechanical behaviour and the damage kinetics of a3D interlock woven fabric composite, especially used for natural gas tanks dedicated to thetransportation industry. On the one hand, we aim at predicting the macroscopic coefficients ofthe stiffness matrix by homogenization multiscale approach. For this, we identified a basicunit cell which represents well the composite microstructure. On the other hand, damagemechanisms are analyzed: optical microscopy examinations on damaged specimens revealedseveral types of defects. We used the same multi-scale approach to assess the impact of thesedefects on the decrease of stiffness.
Möglichkeiten der CT-Arthrographie in der Diagnostik von Schulterinstabilitäten
1990
In the course of a prospective study, CT arthrography was carried out on 40 patients with shoulder instability. In 35 of these patients a lesion of the capsule and labrum was demonstrated, indicating glenohumeral instability; in three patients this was shown primarily by CT arthrography. In three patients, multidirectional instability was demonstrated. In four patients there was an isolated lesion of the labrum, whereas in one patient all the findings were normal. Compared with the capsulo-labral lesions, bone changes involving the head of the humerus and the glenoid were of lesser importance, although their severity affected the choice of operative treatment in four patients. Fifteen of th…
Posterior Shoulder Instability
2020
Posterior shoulder instability is often hard to diagnose with clinical examination. Patients generally present with vague pain, weakness, and/or joint clicking but less frequently complaining of frank sensation of instability. Imaging examinations, especially MR imaging and magnetic resonance arthrography, have a pivotal role in the identification and management of this condition. This review describes the pathologic micro/macrotraumatic magnetic resonance features of posterior shoulder instability as well as the underlying joint abnormalities predisposing to this condition, including developmental anomalies of the glenoid fossa, humeral head, posterior labrum, and capsular and ligamentous …
MR-Tomographie versus CT-Arthrographie bei glenohumeralen Instabilitäten
1992
In a prospective study the diagnostic value of MRI compared to CT arthrography (CT-A) was evaluated in 26 patients with 27 instable shoulder joints. Surgical and/or arthroscopic correlation was available in all cases. Both methods showed a high accuracy (96% CT-A, 94% MRI) in the evaluation of the glenoid labrum. CT-A was significantly superior to MRI in the detection of capsular lesions (sensitivity 96% vs. 44%, accuracy 96% vs. 72%, negative predictive value 96% vs. 67%). CT-A and MRI results regarding humeral head fractures were similar; fractures of the glenoid rim were better detected by CT-A, the difference, however, was statistically not significant. Overall, CT-A proved to be superi…
Stellenwert der MR-Tomographie bei akuten Schulterluxationen
1992
24 patients up to two weeks after primary traumatic shoulder dislocation were examined at 0.5 and 1.5 T. Surgical and/or arthroscopic correlation was available in 13, CT-arthrographic correlation in 16 patients. A joint effusion allowing sufficient evaluation of the capsulolabral complex was present in 21/24 (87.5%) cases. 11/14 patients with combined dislocated detachments of the glenoid labrum and capsular lesions were subsequently operated upon. Marrow edema of the humeral head was found in 16/19 Hill-Sachs lesions and in 4/5 fractures of the greater tuberosity. Two patients presented with a lesion of the long biceps tendon associated with rotator cuff tears and were also subsequently op…