A novel Compound Elliptical-type Concentrator for parabolic primaries with tubular receiver

The Parabolic Trough (PT) is the most used concentrator in CSP (Concentrated Solar Power). However, this concentrator technology is facing a significant challenge to increase its overall efficiency and cost-effectiveness. Meanwhile, other low-cost solutions such as Fresnel concentrators are also being perceived as potentially attractive. In order to achieve the lower cost goal, new optical solutions can be considered, in parallel with improvements coming, for instance, through the use of new materials or manufacturing solutions. But conventional PTs can still be improved to yield, for instance, higher concentration values, a possible starting point for higher conversion efficiency. These new solutions, in turn, can also be useful for other technologies and applications (Fresnel Concentrators, Central Tower Receivers, etc.). However it is easier to develop and test these solutions in conjunction with parabolic primaries (continuum primary). And that is the topic of this paper: to present a new Compound Elliptical-type Concentrator for a parabolic primary with a tubular receiver. A comparison is made between this new concentrator and two other concentrators (a conventional PT concentrator and a XX SMS (Simultaneous Multiple Surface) concentrator), as well as a calculation of the total amount of collected energy (kW h) for a particular location, Faro (Portugal). The paper ends with a discussion of the results obtained, their impact and possible applications in the future.

Mapping the uncharted territory of folk drama

Students of mumming and guising plays – the seasonal verse dramas performed for over 200 years throughout much of England, Scotland, and northern Ireland – have suffered from having too much information to work with. The first part of this poster presentation outlines and illustrates the situation. There are thousands of places where the plays are known to have been performed, and hundreds of texts have been collected. Furthermore, the plays show some tantalising similarities while simultaneously exhibiting the wide range of variation one would expect from orally transmitted dialogue. Until recently, scholars openly admitted to not knowing where to start with such a flood of material, to the extent that some dismissed the texts altogether as unimportant and irrelevant, focussing instead on the "actions". Fortunately, the introduction of computers has managed to break the impasse and is aiding the intellectual process. Part two shows a case study for one of the tools on the Master Mummers website - the Folk Play Scripts Explorer – which is based on a large database of digitised texts and a typology for individual lines. This allows researchers to search for lines, explore textual variants, and map their geographical distribution. This is yielding some interesting surprises. Seemingly trivial variations often turn out to have discrete distribution patterns, while it transpires that certain "ubiquitous" lines have restricted geographical ranges. Thus, the Scripts Explorer is providing novel insights into how the plays evolved and spread.

La réactualisation du testament littéraire et du tombeau poétique dans Testament et Drama Queens de Vickie Gendreau

Le présent mémoire porte sur la réécriture par Vickie Gendreau, auteure québécoise contemporaine, de deux genres funèbres, le testament littéraire et le tombeau poétique. Dans ses deux récits, Testament et Drama Queens, Gendreau met en scène des narratrices qui s'apprêtent à mourir des suites d'une tumeur au cerveau, ce qui soulève plusieurs questions : de quelle manière tisse-t-elle des rapports intertextuels avec les genres évoqués plus haut ? Comment l'appropriation des genres funèbres permet-elle de vaincre l'angoisse associée à la mort proclamée par les médecins ? Comment penser l'écriture du corps et la fictionalisation de soi à l'aune de deux genres datant de l'époque médiévale ou de la Renaissance ? Dans le premier chapitre, nous nous attardons à la construction par Gendreau du testament littéraire dans sa forme médiévale dans Testament et à la reprise dans Drama Queens d'enjeux testamentaires ; l'héritage, la filiation et la transmission. La réécriture permet l'incorporation dans le récit de l'autodérision et de la mise en scène du devenir-cadavre. Dans le second chapitre, nous explorons le tombeau poétique, tant celui de la Renaissance que celui des poètes modernes. Ce faisant, nous abordons les discours de commémoration du défunt et surtout l'appropriation de la commémoration par les deux narratrices, et ultimement par Vickie Gendreau.

La réactualisation du testament littéraire et du tombeau poétique dans Testament et Drama Queens de Vickie Gendreau

Le présent mémoire porte sur la réécriture par Vickie Gendreau, auteure québécoise contemporaine, de deux genres funèbres, le testament littéraire et le tombeau poétique. Dans ses deux récits, Testament et Drama Queens, Gendreau met en scène des narratrices qui s'apprêtent à mourir des suites d'une tumeur au cerveau, ce qui soulève plusieurs questions : de quelle manière tisse-t-elle des rapports intertextuels avec les genres évoqués plus haut ? Comment l'appropriation des genres funèbres permet-elle de vaincre l'angoisse associée à la mort proclamée par les médecins ? Comment penser l'écriture du corps et la fictionalisation de soi à l'aune de deux genres datant de l'époque médiévale ou de la Renaissance ? Dans le premier chapitre, nous nous attardons à la construction par Gendreau du testament littéraire dans sa forme médiévale dans Testament et à la reprise dans Drama Queens d'enjeux testamentaires ; l'héritage, la filiation et la transmission. La réécriture permet l'incorporation dans le récit de l'autodérision et de la mise en scène du devenir-cadavre. Dans le second chapitre, nous explorons le tombeau poétique, tant celui de la Renaissance que celui des poètes modernes. Ce faisant, nous abordons les discours de commémoration du défunt et surtout l'appropriation de la commémoration par les deux narratrices, et ultimement par Vickie Gendreau.

New weapons to fight old enemies: novel strategies for the (bio)control of bacterial biofilms in the food industry

Biofilms are microbial communities characterized by their adhesion to solid surfaces and the production of a matrix of exopolymeric substances, consisting of polysaccharides, proteins, DNA and lipids, which surround the microorganisms lending structural integrity and a unique biochemical profile to the biofilm. Biofilm formation enhances the ability of the producer/s to persist in a given environment. Pathogenic and spoilage bacterial species capable of forming biofilms are a significant problem for the healthcare and food industries, as their biofilm-forming ability protects them from common cleaning processes and allows them to remain in the environment post-sanitation. In the food industry, persistent bacteria colonize the inside of mixing tanks, vats and tubing, compromising food safety and quality. Strategies to overcome bacterial persistence through inhibition of biofilm formation or removal of mature biofilms are therefore necessary. Current biofilm control strategies employed in the food industry (cleaning and disinfection, material selection and surface preconditioning, plasma treatment, ultrasonication, etc.), although effective to a certain point, fall short of biofilm control. Efforts have been explored, mainly with a view to their application in pharmaceutical and healthcare settings, which focus on targeting molecular determinants regulating biofilm formation. Their application to the food industry would greatly aid efforts to eradicate undesirable bacteria from food processing environments and, ultimately, from food products. These approaches, in contrast to bactericidal approaches, exert less selective pressure which in turn would reduce the likelihood of resistance development. A particularly interesting strategy targets quorum sensing systems, which regulate gene expression in response to fluctuations in cell-population density governing essential cellular processes including biofilm formation. This review article discusses the problems associated with bacterial biofilms in the food industry and summarizes the recent strategies explored to inhibit biofilm formation, with special focus on those targeting quorum sensing.

A Novel Range Test

In a range test, one party holds a ciphertext and needs to test whether the message encrypted in the ciphertext is within a certain interval range. In this paper, a range test protocol is proposed, where the party holding the ciphertext asks another party holding the private key of the encryption algorithm to help him. These two parties run the protocol to implement the test. The test returns TRUE if and only if the encrypted message is within the certain interval range. If the two parties do not conspire, no information about the encrypted message is revealed from the test except what can be deduced from the test result. Advantages of the new protocol over the existing related techniques are that it achieves correctness, soundness, °exibility, high e±ciency and privacy simultaneously.

An application of fractal image-set coding in facial recognition

Faces are complex patterns that often differ in only subtle ways. Face recognition algorithms have difficulty in coping with differences in lighting, cameras, pose, expression, etc. We propose a novel approach for facial recognition based on a new feature extraction method called fractal image-set encoding. This feature extraction method is a specialized fractal image coding technique that makes fractal codes more suitable for object and face recognition. A fractal code of a gray-scale image can be divided in two parts – geometrical parameters and luminance parameters. We show that fractal codes for an image are not unique and that we can change the set of fractal parameters without significant change in the quality of the reconstructed image. Fractal image-set coding keeps geometrical parameters the same for all images in the database. Differences between images are captured in the non-geometrical or luminance parameters – which are faster to compute. Results on a subset of the XM2VTS database are presented.