An investigation on RCCI combustion in a heavy duty diesel engine using in-cylinder blending of diesel and gasoline fuels

An experimental and numerical study has been carried out to understand mixing and auto-ignition processes in RCCI combustion conditions, using gasoline and diesel as low and high reactivity fuels, respectively. Three parametrical studies have been developed using a heavy duty compression ignition engine equipped with a direct injector and a port fuel injector, to be able to vary the in-cylinder fuel blending ratio. Besides, a detailed analysis in terms of air/fuel mixing process has also been performed by means of a 1-D spray model. It is found that combustion starts with the auto-ignition of the diesel injection and the air and gasoline entrained. Then, the temperature and pressure raise starts the flame propagation across the lean diesel and gasoline zones of the combustion chamber. As the Diesel/Gasoline fuel ratio is reduced, the ignition delay increases extending the mixing time and the first combustion stage gets lowered while the second one is enhanced. The advance of the diesel injection timing enlarges the mentioned effects over the combustion process. With respect to conventional neat diesel combustion, a slight reduction in terms of NOx and a very important reduction in terms of soot were achieved with the RCCI combustion.The authors would like to thank VOLVO Group Trucks Technology for supporting this research.Benajes Calvo, JV.; Molina Alcaide, SA.; García Martínez, A.; Belarte Mañes, E.; Vanvolsem, M. (2014). An investigation on RCCI combustion in a heavy duty diesel engine using in-cylinder blending of diesel and gasoline fuels. Applied Thermal Engineering. 63(1):66-76. doi:10.1016/j.applthermaleng.2013.10.052S667663

Durante (Marcello). Geschichte der italienischen Sprache : vom Latein bis Heute.

Vanvolsem Serge. Durante (Marcello). Geschichte der italienischen Sprache : vom Latein bis Heute. . In: Revue belge de philologie et d'histoire, tome 73, fasc. 3, 1995. Langues et littératures modernes - Moderne taal-en letterkunde. pp. 904-910

Durante (Marcello). Geschichte der italienischen Sprache : vom Latein bis Heute.

Vanvolsem Serge. Durante (Marcello). Geschichte der italienischen Sprache : vom Latein bis Heute. . In: Revue belge de philologie et d'histoire, tome 73, fasc. 3, 1995. Langues et littératures modernes - Moderne taal-en letterkunde. pp. 904-910

The experience of time in still photographic images

The strip technique used during this research allows to create new forms for the photographically representation of time. The technique itself is based on a partial exposure of the photo sensitive material, which is moving in front of the shutter or visa versa. The technique is probably first used in 1843 in a panoramic camera, but it has since been used in all sorts of ‘scientific’ fields. As early as 1858, the Italian scientist Ignazio Porro developed his own strip-based panoramic cameras as an aid for mapping. In the same year the Frenchman Charles Chevallier developed his Photographic Plane Table, also a strip-based camera, for the same purpose. At the end of the 19th century the British Museum developed a peripheral camera based on the strip technique, to photograph the circumference of Greek vases. And when aerial photography replaced the panoramas made from land, the strip technique proved to be successful for low altitude flights. The Royal Air Force made an aerial continuous strip camera for survey purposes during the Palestine campaign (1915-1918). And from 1937 onwards the strip technique is in use for the time registration of athletes crossing a finish line. Also in synchro-ballistic research, scanners and copiers the basic principle of the strip technique are used for making images. More recently, since the 1960s, there has also been an artistic use of the technique. Although in a first phase this artistic use is nothing more than the use of the traditional scientific cameras in a different environment, from the 1980s onward one can see how more and more artists come across the strip technique in their search for specific image results. George Silk and especially Andrew Davidhazy play an important role in this renewed interest in the technique. In the articles Prof. Davidhazy publishes on a regular basis since the 1970s, not only he is the first to bring the different scientific fields in which the strip technique is used together, but he also discusses the ‘home made’ versions of panoramic, photo finish and peripheral cameras. However a real accumulation of knowledge can not be noted. Often artists using the technique claim to have invented a new way of making photographic images and often do not know about the results of their colleagues. Michael Golembewski, who developed his own digital scanner camera, is probably the most obvious example. Nevertheless slowly, a shift can be noted from the non-scientific use to the meta-photographic use of the technique in which photography itself is questioned. With artists such as Joachim Bonnemaison, Stephen Lawson, Tim Macmillan, Marie-Françoise Plissart, Simon Read, Jonathan Shaw one can see how the ‘scientific’ manuals of the strip cameras are neglected. The panoramic camera is no longer made level, the photo finish camera is no longer fixed on the finish line. With this meta-photographic use of the technique it becomes clear, that the generally prevailing thought about photography and time, can no longer be applied to this kind of photography. The temporal component of the images, previously often ignored or reduced to a fraction of a second, now becomes the main subject of the images. With my work, as explained thoroughly, I would like to emphasise this notion of time that is inherently part of the strip images. After careful re-examination of the art forms that are associated with a strong temporal component, they seem to help us understanding the way the strip images work. It are in particular the Chinese scroll paintings and music that serve as examples. The temporal terms as ‘speed’, ‘rhythm’ and ‘pace’, which are primarily used for the description of these art forms, turned out to play also an important role in the description and the analysis of the strip images. The prevailing concepts of time imposed on the photographic image, rather than being the result of a reflection on photography and its technology, seem to be inherited from painting and from photographic practices in which only the artistic results are considered valuable. As a result only the snapshot and the time exposure seem to be covered in the reflection on time and the photographic image. Therefore an important part of this research was assigned to the description of the strip technique and of the way the strip-based camera operated. As the time components of on the one hand the making of the images, and on the other hand the reading of the images do play an important role in the relation to the strip images, it becomes possible to generate a new thinking on the photographic images and their relation to time. Apart from their capacity to show, the strip images can also convey an experience. This is a quality of the photographic image that is seldom recognized. It comes to the fore in the relation a spectator has with the work, mentally and physically. Therefore not only the depicted does play an important role, but also the presentation of the photography. Different possibilities are used to enable a reading of the strip image in which the changing focus, the moving camera, is made more visible. A notion as horizontality plays here an important role, as it stimulates the reading of the strip images. During the research different types of projectors were used, lightboxes that contained the original film material (60 mm x 1,63 m), and all sorts of prints. At first the horizontal lightboxes and the contact print presented on a table seemed to be the best in conveying this experience of time. But also when the images are enlarged and a certain image length to height ratio is respected in the image, a temporal reading often prevails on the traditional notion of the snapshot.Chapter 1. Strip photography and its historical context 1. A camera mechanism (Invention and re-invention) Chapter 2. Photographers working with the technique 1. Introduction 2. Chronological overview 3. Shift in the use of the strip technique by artists 81 4. Conclusion Chapter 3. The Strip technique 1. Introduction 2. Shutter technique 3. The cameras 4. Making the image Chapter 4. Photography: Seeing Time 1. Forgotten possibilities of photography and its technique 2. Reading a non still image 3. Time in the strip image 4.The intrinsic time of a work of art Chapter 5. Images and Presentation 1. Images 2. Presentationstatus: publishe

L'infinito sostantivato italiano nel quadro romanzo. L'infinito sostantivato nei promessi sposi d'alessandro manzoni. Raccolta dei dati

Thèse de doctorat -- Université catholique de Louvain, 198

La reconnaissance des émotions dans la maladie de Huntington : exploration écologique et crossmodale

La reconnaissance des émotions au sein de la maladie de Huntington présente des difficultés. Différentes questions vont encadrer ce travail qui s’intéresse à ce sujet: (1) Ce trouble est-il généralisé à la perception des caractéristiques faciales ou ne concerne-t-il que les émotions? (2) Y a-t-il un ralentissement cognitif spécifique à la reconnaissance des émotions ? (3) Les émotions présentées de manière crossmodale sont-elles mieux et plus rapidement reconnues que celles présentées sous la forme unimodale ? (4) Quelles modalités (auditive ou visuelle) engendrent le plus de difficulté et au niveau de quelles émotions ? (5) Existe-t-il un lien entre reconnaissance des émotions et cognition sociale? Ces objectifs seront étudiés à travers un échantillon de 43 patients Huntington (et 49 participants contrôles. Trois tâches ont été effectuées et ont permis de mesurer les pourcentages de réponses correctes pour la reconnaissance des émotions sous les conditions visuelles, auditives et audiovisuelles. Les temps de réaction en milliseconde ont également été mesurés. Les résultats ont mis en évidence des ralentissements chez les patients Huntington symptomatiques et chez les patients présymptomatiques. Un effet bénéfique de la condition crossmodale concernant les performances a été remarqué chez les patients et chez les participants contrôles. Toutes les expressions faciales et vocales ont été significativement moins bien reconnues par les patients symptomatiques avec de moins bonnes performances encore pour les émotions auditives. Enfin, une corrélation positive a été remarquée entre la reconnaissance des émotions et le quotient d’empathie autoapporté.Mémoire de master [120] en sciences psychologiques, Université catholique de Louvain, 201