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Auswahl der wissenschaftlichen Literatur zum Thema „Heterogenous assemblages“
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Zeitschriftenartikel zum Thema "Heterogenous assemblages"
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Behan-Pelletier, V. M., und B. Bissett. „ORIBATIDA OF CANADIAN PEATLANDS“. Memoirs of the Entomological Society of Canada 126, S169 (1994): 73–88. http://dx.doi.org/10.4039/entm126169073-1.
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AbstractThis paper reviews and summarizes preliminary data on the taxonomy, distribution, and ecology of oribatid mites of Canadian peatlands, primarily those of eastern Canada. This fauna is a heterogenous assemblage comprising 71 species in 49 genera and 34 families, found in four main types of habitats: aquatic, mesic, xeric, and epigeal. About half of the oribatid fauna of peatlands, and most aquatic species, are restricted in distribution to the Nearctic. Oribatid taxa known or suspected to be parthenogenetic are much better represented in peatlands than in the general Canadian fauna. Data on the feeding habits of odonate larvae in Newfoundland bog pools, based on gut content analysis, show that oribatid mites, in particular species of Limnozetes Hull and Hydrozetes Berlese, are common prey of species of Aeshna Fabricius, Leucorrhina Brittinger, and Libellula L. A synopsis of available data suggests that assemblages of Limnozetes species may be useful in characterizing peatlands.
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Ragan, Ashley N., und Jeffrey R. Wozniak. „Linking Hydrologic Connectivity in Salt Marsh Ponds to Fish Assemblages across a Heterogenous Coastal Habitat“. Journal of Coastal Research 35, Nr. 3 (17.10.2018): 545. http://dx.doi.org/10.2112/jcoastres-d-18-00007.1.
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Robinson, David. „Assemblage Theory and the Capacity to Value: An Archaeological Approach from Cache Cave, California, USA“. Cambridge Archaeological Journal 27, Nr. 1 (11.01.2017): 155–68. http://dx.doi.org/10.1017/s0959774316000639.
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New discoveries from a Californian cave have found a remarkable assemblage of cached perishable and other artefacts. Comprised of baskets, cordage, bone, antler, leather, food residues and other materials, the assemblages are dispersed through four caves in the largest ever cache discovered in the borderland region attributable to the native Californian linguistic group known as the Chumash. This paper develops a methodology based upon DeLanda's philosophy of assemblages and Graeber's anthropological theory of value. Importantly, following Normark, it is argue that assemblage theory needs to be operationalized into a methodological approach in order to apply it archaeologically. This methodology illustrate how a capacity analysis of the Cache Cave assemblage relates to values within the society which cached it by revealing the relational capacities within assemblages and relative capacities between them. Importantly, as a scalable approach, capacity analysis allows the investigation of the heterogeneous dynamics within complex societies.
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Hamilakis, Yannis. „Sensorial Assemblages: Affect, Memory and Temporality in Assemblage Thinking“. Cambridge Archaeological Journal 27, Nr. 1 (11.01.2017): 169–82. http://dx.doi.org/10.1017/s0959774316000676.
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Archaeologists are familiar with the concept of assemblage, but in more recent years they have started problematizing it in interesting and innovative ways, beyond its common connotations of aggregation. Sociologists such as Manuel DeLanda and political philosophers such as Jane Bennett have been key influences in this move. These authors had adapted and modified the assemblage thinking of Deleuze and Guattari. In this article, an assemblage of sorts itself, I propose that we need to return to that original Deleuzian body of thinking and explore its richness further. Assemblages, temporary and deliberate heterogeneous arrangements of material and immaterial elements, are about the relationship of in-betweenness. I further suggest that sensoriality and affectivity, memory and multi-temporality are key features of assemblage thinking, and that assemblages also imply certain political effects. The omission of these features in the archaeological treatments of the concept may lead to mechanistic reincarnations of systems thinking, thus depriving the concept of its potential. Finally, I explore these ideas by considering communal eating and feasting events as powerful sensorial assemblages.
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Alfaro, Julius Raynard D., Donn Lorenz Ivan M. Alcayde, Joel B. Agbulos, Nikki Heherson A. Dagamac und Thomas Edison E. Dela Cruz. „The occurrence of myxomycetes from a lowland montane forest and agricultural plantations of Negros Occidental, Western Visayas, Philippines“. Fine Focus 1, Nr. 1 (01.12.2014): 7–20. http://dx.doi.org/10.33043/ff.1.1.7-20.
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Higher floral and faunal biodiversity is expected in multi-species-covered mountainous forests than in mono-typic agricultural plantations. To verify this supposition for cryptogamic species like the plasmodial slime molds, a rapid field survey was conducted for myxomycetes and substrates in forest floor litter and agricultural plantation were collected in Negros Occidental, Philippines. Morphological characterization identified a total of 28 species belonging to the genera Arcyria, Ceratiomyxa, Collaria, Comatricha, Craterium, Cribraria, Diderma, Didymium, Hemitrichia, Lamproderma, Physarum, Stemonitis, Trichia and Tubifera. The myxomycete species Arcyria cinerea was the only abundant species found both in the agricultural and forested areas. The majority of collected species were rarely occurring. In terms of species composition, more myxomycetes were recorded in the mountainous forest (27) compared to agricultural sites. Furthermore, aerial leaf litter collected in the forests had the highest number of records for fruiting bodies but in terms of species diversity, twigs yielded higher value based on Shannon index. Findings in this study verify that a habitat with more heterogenous plant communities yields higher species of myxomycete assemblages. This research is the first study to report myxomycetes from Negros Occidental.
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Seastedt, Timothy R., und Meagan Oldfather. „Climate Change, Ecosystem Processes and Biological Diversity Responses in High Elevation Communities“. Climate 9, Nr. 5 (19.05.2021): 87. http://dx.doi.org/10.3390/cli9050087.
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The populations, species, and communities in high elevation mountainous regions at or above tree line are being impacted by the changing climate. Mountain systems have been recognized as both resilient and extremely threatened by climate change, requiring a more nuanced understanding of potential trajectories of the biotic communities. For high elevation systems in particular, we need to consider how the interactions among climate drivers and topography currently structure the diversity, species composition, and life-history strategies of these communities. Further, predicting biotic responses to changing climate requires knowledge of intra- and inter-specific climate associations within the context of topographically heterogenous landscapes. Changes in temperature, snow, and rain characteristics at regional scales are amplified or attenuated by slope, aspect, and wind patterns occurring at local scales that are often under a hectare or even a meter in extent. Community assemblages are structured by the soil moisture and growing season duration at these local sites, and directional climate change has the potential to alter these two drivers together, independently, or in opposition to one another due to local, intervening variables. Changes threaten species whose water and growing season duration requirements are locally extirpated or species who may be outcompeted by nearby faster-growing, warmer/drier adapted species. However, barring non-analogue climate conditions, species may also be able to more easily track required resource regimes in topographically heterogenous landscapes. New species arrivals composed of competitors, predators and pathogens can further mediate the direct impacts of the changing climate. Plants are moving uphill, demonstrating primary succession with the emergence of new habitats from snow and rock, but these shifts are constrained over the short term by soil limitations and microbes and ultimately by the lack of colonizable terrestrial surfaces. Meanwhile, both subalpine herbaceous and woody species pose threats to more cold-adapted species. Overall, the multiple interacting direct and indirect effects of the changing climate on high elevation systems may lead to multiple potential trajectories for these systems.
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Crellin, Rachel J. „Changing Assemblages: Vibrant Matter in Burial Assemblages“. Cambridge Archaeological Journal 27, Nr. 1 (11.01.2017): 111–25. http://dx.doi.org/10.1017/s0959774316000664.
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In this paper the notion of assemblage, as derived from the work of Gilles Deleuze, is explored in order to consider change in prehistory. An assemblage-based approach that draws on the concept of ‘vibrant matter’ is implemented as the means of understanding change. In this approach all materials are viewed as vibrant and in flux. These ideas are used to create a heterogeneous view of change where assemblages, or parts of assemblages, may change at varying speeds and rhythms and at many different scales. These ideas are explored through the case study of changing burial practices between 3000 and 1500 cal bc on the Isle of Man. I suggest that this kind of thinking allows us to study change differently, and explore the advantages of this approach for archaeology.
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Battisti, Corrado. „Bird assemblages on a Mediterranean sandy beach: a yearly study“. Rivista Italiana di Ornitologia 84, Nr. 1 (20.03.2015): 23. http://dx.doi.org/10.4081/rio.2014.214.
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Around the 2007 yearly cycle, we carried out a transect in a Mediterranean sandy beach (central Italy), a structurally oversimplified ecosystem, elaborating the data in six bimonthly periods and in three longitudinal habitat types. We observed 25 bird species. Assemblages appear heterogeneous at taxonomic-, phenological- and ecological-level. Also normalizing (Margalef index), in winter the beach hosted the richest assemblage, in summer-autumn the lowest. The inner dunal area appears the richest habitat type. Here, the presence of vegetation presumably permits the occurrence of a large availability of different trophic resources for different species. Beaches represent patchy ecosystems with a different availability of resources in space and time that host heterogeneous bird assemblages, different in their ecology and phenology around a yearly cycle.
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Zedeño, María Nieves. „Animating by Association: Index Objects and Relational Taxonomies“. Cambridge Archaeological Journal 19, Nr. 3 (Oktober 2009): 407–17. http://dx.doi.org/10.1017/s0959774309000596.
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Despite great variability in archaeological and ethnographic material culture across North America, a handful of objects are ubiquitous in assemblages of different ages and geographies. These index objects are clues to ontological principles, such as animacy, that guide the interactions between Native Americans and the material world. The impact of relational ontologies on the formation of heterogeneous archaeological assemblages may be evaluated through analyses of index objects and contextual associations. To this effect, this article presents the outline of an assemblage-based relational taxonomy, where spatial, temporal, and formal dimensions are combined with object biographies, interactive roles, and social relations.
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Rødje, Kjetil. „Intra-Diegetic Cameras as Cinematic Actor Assemblages in Found Footage Horror Cinema“. Film-Philosophy 21, Nr. 2 (Juni 2017): 206–22. http://dx.doi.org/10.3366/film.2017.0044.
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This article proposes a reconceptualization of the term “actor” within motion pictures and presents the argument that “acting” is a matter of distributed agency performed by heterogeneous assemblages. What constitutes an actor is what I will label as a “cinematic actor assemblage,” a term that comprises what is commonly known as human actors as well as material entities that play an active part in motion picture images. The use of intra-diegetic cameras in contemporary found footage horror films constitutes a particular case of such cinematic actor assemblages. Through a dynamic relational performance, cameras here take on roles as active agents with the potential to affect other elements within the images as well as the films’ audiences. In found footage horror the assemblage mode of operation creates suspense, since the vulnerability of the camera threatens the viewer's access to the depicted events. While human characters and individual entities making up the camera assemblage are disposable, the recording is not. Found footage horror crucially hinges upon the survival of the footage. I will further suggest that these films allow filmmakers to experiment with the acting capabilities of intra-diegetic cameras.
Dissertationen zum Thema "Heterogenous assemblages"
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Kankia, Giorgi. „Stockholm’s New Golden Bridge : A material infrastructure, fluid assemblage or megaproject?“ Thesis, Stockholms universitet, Kulturgeografiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-193941.
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The recent addition to Stockholm’s built environment in the shape of the new Slussen bridge, or Guldbron as most locals call it, has been both a source of controversy and admiration. This reaction is typical of any infrastructure that reshapes our surroundings. However, this interaction is not unidirectional. Similar projects may be affected by the very relations they might trigger in the first place. Building upon the conjunction of crucial concepts from actor-network theory and assemblage thinking, this study intends to identify the co-producing nature of the bridge as a technical artefact and the relations surrounding the project. To that end, I employ a qualitative research technique combining various methods of interviews and observation. The research primarily identifies the desired nature of the bridge and its ability to stabilize relations as a heterogeneous assemblage. Ultimately, the everchanging state of affairs or fluid character of this piece of infrastructure is discussed. The thesis concludes by arguing that the exploration of similar projects from a relational perspective challenges the conceptualization of megaprojects as taken- for-granted entities. Such an understanding brings to the forefront the crucial importance of interactions to define whether a project can be considered as ‘mega’, as opposed to employing a prescribed set of criteria.
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Schelcher, Guillaume. „Le transfert de films : vers une intégration hétérogène des micro et nanosystèmes“. Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00755977.
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Une technologie d'élaboration de micro et nanosystèmes idéale devrait permettre l'intégration de différents matériaux (magnétiques, piézoélectriques, polymères, etc.) ou structures (composants optiques, mécaniques, optoélectroniques, etc.) de nature fortement hétérogène dans le but d'obtenir des systèmes multifonctionnels complexes éventuellement encapsulés. Un moyen de contourner les différents problèmes d'incompatibilité, liés aux mélanges des technologies de fabrication, est de transférer les différents films de matériaux ou composants d'un substrat donneur, sur lequel ils ont été préalablement élaborés, vers le substrat comportant le système visé Dans cette optique, un procédé de transfert de film à basse température a été développé. Ce procédé repose sur le contrôle de l'adhésion d'un film mince de nickel préformé, à partir d'un substrat dit " donneur ", sur une couche à adhésion contrôlée de nature carbonée ou fluorocarbonée. La libération mécanique du film, sur un substrat dit " cible ", est assurée par une soudure adhésive via des cordons de scellement en BCB. Grâce à sa facilité de mise en œuvre et aux faibles températures requises pour le scellement des substrats, ce procédé a permis de transférer des microstructures en nickel sur des substrats de silicium, de verre ainsi que sur des substrats Kapton souples. L'emploi d'une soudure BCB assure l'isolation thermique et électrique des microstructures sur le substrat cible. La versatilité du procédé a été prouvée par l'empilement de microstructures suspendues et par le transfert de divers matériaux. Ce procédé est très prometteur pour de nombreuses applications et apporte de nouvelles perspectives quant à l'intégration hétérogène 3D de micro et nanosystèmes.
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Kümmel, Monika. „Nanocraters : a bottom-up approach towards heterogeneous inorganic nanopatterns by copolymer templated chemical solution deposition“. Paris 6, 2008. http://www.theses.fr/2008PA066324.
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Des motifs nanométriques d’oxydes métalliques (TiO2, Al2O3, ZrO2) étaient synthétisés avec une technique bottom-up. Un mélange de précurseurs moléculaires et de micelles préformées des copolymères à block est déposé sur des substrats tels que la silice, l’or ou l’ITO par voie de trempage. Des monocouches de micelles entourées par les espèces inorganiques sont deposées à des concentrations et des vitesses de dépôt faibles. Calcination élimine les copolymères et des motifs (perforations rondes, canaux, anneaux,…) rigides d’oxyde métallique sont obtenus. La présence de monocouches de perforations d’un diamètre entre 10 et 70nm ainsi que l’accessibilité de la surface du substrat a travers ces perforations a été confirme avec plusieurs méthodes de caractérisation. Les dessins du type nanocrateres sont bifunctionels, peuvent être functionalisé sélectivement et ont une bonne stabilité mécanique, thermique et chimique ce qui fait que ces matériaux sont intéressants pour plusieurs applicationsMetal oxide nanopatterns (TiO2, Al2O3, ZrO2) were synthesised with a bottom up technique that combines the method of chemical solution deposition and the self-organisation properties of block copolymer micelles on a substrate surface through Evaporation Induced Micelle Packing (EIMP). Molecular precursors were mixed with micelles in EtOH/THF/H2O or EtOH/THF and the solutions were dip coated onto various substrates such as silicon wafers, gold or ITO. High dilution and low withdrawal speed lead to the deposition of micelle monolayers surrounded by inorganic precursors. A calcination step eliminates the block copolymer and rigid metal oxide nanopatterns with various motifs like circular perforations (nanocraters), channels or rings are obtained. The size and kind of the motifs can be controlled by adjusting several crucial parameters during solution preparation like the kind and size of the used block copolymer in combination with the used solvent composition, concentration and conditioning. High kinetics of evaporation during the dip coating further allow ordering of nanocrater perforations in hexagonal patterns. The synthesised patterns were characterised by ellipsometry, AFM, FEG-SEM, GISAXS, XPS, cyclic voltametry and contact angle measurements. The presence of monolayers of perforations with diameters of 10-70nm and accessibility of the substrate surface through the perforations was confirmed. Nanocrater patterns show inherent bifunctionality and the substrate surface and the pattern can be selectively functionalised. In addition, nanocrater patterns are mechanically, chemically and thermally stable and are therefore interesting materials for various kinds of applications
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Mendes, Eduardo da Silva. „Diversity and activity of bats in the mosaic of Baixo Vouga Lagunar“. Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/13788.
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Mestrado em Biologia Aplicada - Ecologia, Biodiversidade e Gestão de EcossistemasThe conversion of natural environments into agricultural land has profound effects on the composition of the landscape, often resulting in a mosaic of crop fields, pastures and remnant patches of natural vegetation. It is thought that an increase in structural complexity of a habitat mosaic may improve the availability of ecological niches for animals, potentially increasing species diversity. Bats are highly vagile, and many species require the use of distinct habitats to fulfil their daily and seasonal needs. However, their distribution throughout a landscape may reflect a response to landscape structure and spatial and seasonal dynamics of resource distribution, as well as preferences for some habitats relative to others, determined by species eco-morphological traits. Therefore, the way bats select a habitat is an aggregative response to both landscape and local features. We investigated the spatial and seasonal patterns of bat diversity and activity within a heterogeneous landscape in Portugal, constituted by a mosaic of natural, semi-natural and human-altered terrestrial, freshwater and brackish habitats. Furthermore, we investigated which landscape features determine those patterns, across four distinct focal scales. We sampled bats acoustically, while simultaneously sampling insects with light traps, across 24 sampling sites representative of the main habitat types that shape the landscape. We found bat assemblages of the different habitats to be relatively similar, and that bat activity hardly differed among them. However, we found seasonal variation in bat activity within habitats. Additionally, our results revealed both scale- and guild-dependent responses of bats to landscape and local features. Overall, our results suggest that bats exploit all habitats of this heterogeneous area, and that the mosaic landscape provides them several opportunities, which results in strong seasonal and spatial dynamics. On the other hand, we found these dynamics to be influenced by broad-scale landscape features, as well as by weather conditions, and local resource availability and distribution. Lastly, our results indicate that forest and Bocage habitats are potential keystone structures for bats within this heterogeneous landscape.
A conversão de ambientes naturais em terrenos agrícolas tem efeitos profundos na composição da paisagem, frequentemente resultando em mosaicos de campos de cultivo, pastagens e restantes fragmentos de vegetação natural. Pensa-se que um aumento na complexidade estrutural de um mosaico de habitats pode favorecer a disponibilidade de nichos ecológicos para os animais, potencialmente aumentando a diversidade de espécies. Os morcegos são muito móveis, e muitas espécies requerem o uso de diferentes habitats de forma a cumprir as suas necessidades diárias e sazonais. No entanto, a sua distribuição ao longo de uma paisagem pode refletir uma resposta à estrutura da mesma, e às dinâmicas de distribuição espacial e temporal dos recursos, assim como refletir as preferências de alguns habitats em detrimento de outros, determinadas pelas características eco-morfológicas da espécie. Desta forma, a seleção de habitat por parte dos morcegos é uma resposta conjunta a características locais e de paisagem. Neste estudo foram investigados os padrões espaciais e sazonais de atividade e diversidade de morcegos numa paisagem heterogénea em Portugal, constituída por um mosaico de habitats naturais, semi-naturais e alterados pelo Homem, tanto em ambientes terrestres, como sob a influência de água-doce ou salobra. Além disso, foram investigadas quais as características da paisagem que determinam esses padrões, ao longo de quatro escalas focais distintas. A amostragem de morcegos foi feita acusticamente, enquanto em simultâneo se amostraram insetos usando armadilhas de luz, em 24 pontos representativos dos principais tipos de habitat que caracterizam a paisagem. Foi descoberto que as assemblages de morcegos dos diferentes habitats eram relativamente semelhantes entre si, e que a atividade de morcegos praticamente não diferia entre habitats. No entanto, verificou-se a existência de uma forte variação sazonal dos níveis de atividade de morcegos nos vários habitats. Além do mais, os resultados obtidos revelaram que a resposta dada pelos morcegos às características locais e de paisagem é dependente da escala e da guild. De uma forma geral, os resultados obtidos sugerem que os morcegos exploram todos os habitats que constituem esta paisagem heterogénea, e que o mosaico de habitats lhes fornece diversas oportunidades, o que resulta em fortes dinâmicas espaciais e sazonais. Por outro lado, foi descoberto que estas dinâmicas são influenciadas por características da paisagem a uma larga escala, assim como por condições meteorológicas, e pela disponibilidade e distribuição locais de recursos. Por último, os resultados indicam que as zonas florestais e o Bocage são potencialmente os habitats mais importantes para os morcegos nesta paisagem heterogénea.
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Sarbu, Alexandru. „Structure et auto organisation d'organogélateurs électron-accepteurs à base de pérylène bisimide“. Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE010/document.
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L’amélioration des performances des dispositifs photovoltaïques organiques passe par le contrôle de la morphologie de leurs couches actives. Nous cherchons à préparer une hétérojonction volumique donneur-accepteur nanostructurée en utilisant la nucléation hétérogène des poly(3-alkylthiophène)s (P3AT) donneurs sur des fibres d'organogélateurs accepteurs à base de pérylène bisimide (PBI).La première partie de ce travail présente la synthèse de trois dérivés PBI symétriquement N-substitués par des dendrons portant des groupes amides avec des chaînes latérales linéaires (PBI-C8) et ramifiées (PBI-C10) ou par une chaîne alkyle linéaire (PBI-L18). Leur étude physicochimique comparée met en évidence le rôle des liaisons H et de la substitution des chaînes latérales dans l’auto-assemblage.La seconde partie détaille les conditions d’obtention, la structure et les propriétés de deux polymorphes du PBI-C10 générés par la réorganisation des liaisons H.Finalement nous donnons une preuve de concept de l’obtention d’une hétérojonction donneur-accepteur par la nucléation des fibrilles de P3BT sur des rubans de PBI-C8 auto-assemblésImproving the performances of organic photovoltaic devices requires morphology control of the active layers. We seek to prepare highly nanostructured donor-acceptor bulk heterojunctions using the nucleation of semi-conducting donor polymers e.g. poly(3-alkylthiophene)s (P3AT) on self-assembled ribbons of perylene bisimide organogelators.The first part of this work concerns the synthesis of three PBI compounds symmetrically N-substituted by dendrons bearing amide groups and having linear (PBI-C8) and branched (PBI-C10) side-chains or a linear alkyl chain (PBI-L18). Their compared physicochemical study points to the role of H bonds and of side-chains substitution in the self-assembly process.The second part develops to a large extent the structure and the properties of two polymorphs of PBI-C10 generated by H bond reorganization.Finally, a proof of concept is given for the elaboration of donor-acceptor heterojunctions in solution by nucleating P3BT fibrils on self-assembled ribbons of PBI-C8
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Boulaoued, Athmane. „Elaboration et propriétés de matériaux hybrides polymères-systèmes auto-assemblés“. Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE018/document.
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Ce travail de thèse a porté sur l’élaboration de nanomatériaux hybrides de type nano-câbles fonctionnels, composés de polymères covalents et de molécules auto-assemblées. L’approche «bottom-up» adoptée repose sur des processus uniquement physiques, à savoir la nucléation hétérogène, la cristallisation et la gélification thermo réversible. Deux systèmes hybrides ont été élaborés et étudiés: le premier est composé de molécules de tetra-2-éthylhexanoate de bicuivre (CuS8) auto-assemblées en filaments, lesquels sont encapsulés au sein des fibrilles de polystyrène isotactique (iPS). Nous avons montré au travers de différentes études (DSC, DNPA,SQUID, EXAFS et IR-TF) que leur encapsulation permet non seulement de les stabiliser mais également de modifier leur comportement antiferromagnétique. Le deuxième système a consisté à des fibrilles de poly(alkylthiophène)s (P3AT), emmaillotées au moyen de molécules diamides (BHPB-10) capables de s'assembler en nanotubes. En plus des études de la morphologie et de la structuration par TEM et UV-Vis,nous avons étudié les propriétés de conductivité du système hybride P3BT/BHPB-10 en C-AFM. Nous avons montré qu’il est effectivement possible de réaliser des nano-câbles semi-conducteur gainésThis thesis deals with new hybrid nanomaterials of functional nanocable-like structures, consisting of covalent polymers and self-assembled molecules. The «bottom-up» approach adopted for the elaboration is based only on physical processes such as heterogeneous nucleation, crystallization and thermoreversible gelation. This original approach allowed us to easily prepare two functional nanocables: the first consisted of bicopper tetra-2-ethylhexanoate (CuS8) molecules self-assembled on filaments which are encapsulated within isotactic polystyrene (iPS) fibrils. We proved throughout different studies (DSC, SANS, SQUID, EXAFS and FT-IR) that the encapsulation allows one to get stable filaments, and particularly to modify their antiferromagnetic behavior as well. The second system constituted of poly(alkylthiophene)s fibrilles (P3AT), sheathed by diamides molecules (BHPB-10) self-assembled on nanotubes. Besides the morphological and the structuration studies (TEM and UV-Vis), we investigated the conductivity of the hybrid system P3BT/BHPB-10 by C-AFM. Results showed the possibility to obtain sheathed semi-conducting nano-cables
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Endo, Fernando Akira. „Génération dynamique de code pour l'optimisation énergétique“. Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAM044/document.
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Dans les systèmes informatiques, la consommation énergétique est devenue le facteur le plus limitant de la croissance de performance observée pendant les décennies précédentes. Conséquemment, les paradigmes d'architectures d'ordinateur et de développement logiciel doivent changer si nous voulons éviter une stagnation de la performance durant les décennies à venir.Dans ce nouveau scénario, des nouveaux designs architecturaux et micro-architecturaux peuvent offrir des possibilités d'améliorer l'efficacité énergétique des ordinateurs, grâce à la spécialisation matérielle, comme par exemple les configurations de cœurs hétérogènes, des nouvelles unités de calcul et des accélérateurs. D'autre part, avec cette nouvelle tendance, le développement logiciel devra faire face au manque de portabilité de la performance entre les matériels toujours en évolution et à l'écart croissant entre la performance exploitée par les programmeurs et la performance maximale exploitable du matériel. Pour traiter ce problème, la contribution de cette thèse est une méthodologie et la preuve de concept d'un cadriciel d'auto-tuning à la volée pour les systèmes embarqués. Le cadriciel proposé peut à la fois adapter du code à une micro-architecture inconnue avant la compilation et explorer des possibilités d'auto-tuning qui dépendent des données d'entrée d'un programme.Dans le but d'étudier la capacité de l'approche proposée à adapter du code à des différentes configurations micro-architecturales, j'ai développé un cadriciel de simulation de processeurs hétérogènes ARM avec exécution dans l'ordre ou dans le désordre, basé sur les simulateurs gem5 et McPAT. Les expérimentations de validation ont démontré en moyenne des erreurs absolues temporels autour de 7 % comparé aux ARM Cortex-A8 et A9, et une estimation relative d'énergie et de performance à 6 % près pour le benchmark Dhrystone 2.1 comparée à des CPUs Cortex-A7 et A15 (big.LITTLE). Les résultats de validation temporelle montrent que gem5 est beaucoup plus précis que les simulateurs similaires existants, dont les erreurs moyennes sont supérieures à 15 %.Un composant important du cadriciel d'auto-tuning à la volée proposé est un outil de génération dynamique de code, appelé deGoal. Il définit un langage dédié dynamique et bas-niveau pour les noyaux de calcul. Pendant cette thèse, j'ai porté deGoal au jeu d'instructions ARM Thumb-2 et créé des nouvelles fonctionnalités pour l'auto-tuning à la volée. Une validation préliminaire dans des processeurs ARM ont montré que deGoal peut en moyenne générer du code machine avec une qualité équivalente ou supérieure comparé aux programmes de référence écrits en C, et même par rapport à du code vectorisé à la main.La méthodologie et la preuve de concept de l'auto-tuning à la volée dans des processeurs embarqués ont été développées autour de deux applications basées sur noyau de calcul, extraits de la suite de benchmark PARSEC 3.0 et de sa version vectorisée à la main PARVEC.Dans l'application favorable, des accélérations de 1.26 et de 1.38 ont été observées sur des cœurs réels et simulés, respectivement, jusqu'à 1.79 et 2.53 (toutes les surcharges dynamiques incluses).J'ai aussi montré par la simulation que l'auto-tuning à la volée d'instructions SIMD aux cœurs d'exécution dans l'ordre peut surpasser le code de référence vectorisé exécuté par des cœurs d'exécution dans le désordre similaires, avec une accélération moyenne de 1.03 et une amélioration de l'efficacité énergétique de 39 %.L'application défavorable a été choisie pour montrer que l'approche proposée a une surcharge négligeable lorsque des versions de noyau plus performantes ne peuvent pas être trouvées.En faisant tourner les deux applications sur les processeurs réels, la performance de l'auto-tuning à la volée est en moyenne seulement 6 % en dessous de la performance obtenue par la meilleure implémentation de noyau trouvée statiquementIn computing systems, energy consumption is limiting the performance growth experienced in the last decades. Consequently, computer architecture and software development paradigms will have to change if we want to avoid a performance stagnation in the next decades.In this new scenario, new architectural and micro-architectural designs can offer the possibility to increase the energy efficiency of hardware, thanks to hardware specialization, such as heterogeneous configurations of cores, new computing units and accelerators. On the other hand, with this new trend, software development should cope with the lack of performance portability to ever changing hardware and with the increasing gap between the performance that programmers can extract and the maximum achievable performance of the hardware. To address this issue, this thesis contributes by proposing a methodology and proof of concept of a run-time auto-tuning framework for embedded systems. The proposed framework can both adapt code to a micro-architecture unknown prior compilation and explore auto-tuning possibilities that are input-dependent.In order to study the capability of the proposed approach to adapt code to different micro-architectural configurations, I developed a simulation framework of heterogeneous in-order and out-of-order ARM cores. Validation experiments demonstrated average absolute timing errors around 7 % when compared to real ARM Cortex-A8 and A9, and relative energy/performance estimations within 6 % for the Dhrystone 2.1 benchmark when compared to Cortex-A7 and A15 (big.LITTLE) CPUs.An important component of the run-time auto-tuning framework is a run-time code generation tool, called deGoal. It defines a low-level dynamic DSL for computing kernels. During this thesis, I ported deGoal to the ARM Thumb-2 ISA and added new features for run-time auto-tuning. A preliminary validation in ARM processors showed that deGoal can in average generate equivalent or higher quality machine code compared to programs written in C, including manually vectorized codes.The methodology and proof of concept of run-time auto-tuning in embedded processors were developed around two kernel-based applications, extracted from the PARSEC 3.0 suite and its hand vectorized version PARVEC. In the favorable application, average speedups of 1.26 and 1.38 were obtained in real and simulated cores, respectively, going up to 1.79 and 2.53 (all run-time overheads included). I also demonstrated through simulations that run-time auto-tuning of SIMD instructions to in-order cores can outperform the reference vectorized code run in similar out-of-order cores, with an average speedup of 1.03 and energy efficiency improvement of 39 %. The unfavorable application was chosen to show that the proposed approach has negligible overheads when better kernel versions can not be found. When both applications run in real hardware, the run-time auto-tuning performance is in average only 6 % way from the performance obtained by the best statically found kernel implementations
Bücher zum Thema "Heterogenous assemblages"
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Bird, Terri. Forming. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781474429344.003.0003.
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The aim of art for Deleuze and Guattari is to render perceptible forces that lie beyond perception and to capture, in what is given, the forces that are not given. They task artists with producing compounds of sensation, heterogeneous assemblages of affects and intensities, extracted from forces lying at the limits of sensibility. This chapter explores the forming of these assemblages through processes of capture orientated around practices employing sculptural methodologies. Although Deleuze and Guattari have little to say about sculpture in general or specific works, they refer to the sensations of stone and metal as vibrating according to the order of strong and weak rhythms. Drawing on the writing of Gilbert Simondon these rhythms are discussed as dynamic modulations that emphasise temporal appearance. And examined in relation to Jack Burnham’s use of systems thinking identified in the artworks, by artists such as Hans Haacke and Public Share, that register complex flows of matter-energy exchanges.
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Bartosiewicz, László. Zooarchaeology in the Carpathian Basin and adjacent areas. Herausgegeben von Umberto Albarella, Mauro Rizzetto, Hannah Russ, Kim Vickers und Sarah Viner-Daniels. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199686476.013.7.
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The Carpathian Basin, situated between the Alps, the Carpathians, and the Dinaric Alps, has been a geographically and culturally diverse area throughout its history. Research intensity in all periods and places is likewise heterogeneous. A complete review of animal–human relationships is, thus, impossible. Following a historical overview of research, characteristic examples of animal exploitation between the Neolithic and the early eighteenth century will be highlighted. Special emphasis is placed on the way migrations and imperial politics impacted the composition of animal bone assemblages. The role of animals in self-representation and other forms of symbolic communication are also considered.
Buchteile zum Thema "Heterogenous assemblages"
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Boeken, Bertrand, und Yarden Oren. „Linking Species Diversity and Landscape Diversity“. In Biodiversity in Drylands. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780195139853.003.0016.
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Ecologists generally agree that species diversity is linked to landscape features (Pickett and White 1985, Glenn et al. 1992, Wiens et al. 1993, Rosenzweig 1995, Hoagland and Collins 1997, Ritchie and Olff 1999). We present a conceptual framework for connecting species diversity and landscapes by showing how changes in species assemblages and changes in landscape structure coincide. We focus on the dynamics of the mutual relationship between (1) the frequency of occurrence of the various landscape mosaic components (patches) and their properties in terms of abiotic conditions, resource availabilities, and structural features, and (2) the occurrence and abundance of the species of an assemblage within and among these components. Although we use examples of assemblages of annual plants in semiarid shrubland, we stress the generality of our approach and its applicability to many other groups of organisms and landscapes. Most ecologists would also agree that there are connections between the observations that (1) individuals and populations of organisms are affected by environmental heterogeneity in the landscape, (2) species assemblages (or communities) consist of populations (or parts of them), and (3) changes in the landscape affect species assemblages, and vice versa. In this chapter we explore this often intuitive relationship explicitly. Our basic premise is that species assemblages are collections of populations interacting with the heterogeneity of the landscape. We use the term “assemblage” to preclude assumptions about interactions and proximity or encounters among the organisms. Simple presence in the sampled landscape is the criterion for belonging to an assemblage; the landscape mosaic is an assemblage of patches, which, like species, may or may not interact. We assume that the landscape is heterogeneous, comprising a mosaic of distinct patches, which can be distinguished by some patch property. Our approach does not require a particular size or kind of landscape, but its scale and structure and the definition of patches have to be relevant for the distribution of the organisms whose diversity we study. In this chapter we discuss the functional connection between the dynamics of landscapes and of species assemblages.
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Vine, Angus. „Chorography and Antiquarian Compilation“. In Miscellaneous Order, 93–124. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198809708.003.0004.
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This chapter examines the miscellany’s links with antiquarian compilation and chorography (the branch of geography concerned with the particulars of a specific region or place). Its primary interest is with textual production in the two fields, and with the practices of annotation and organization that allowed antiquaries and chorographers to turn their heterogeneous notes into orderly narratives. The manuscript miscellany, it argues, was essential to the kind of assemblage scholars carried out here. Compilers discussed in the chapter include William Lambarde, Edmund Tilney, George Owen of Henllys, Abraham Ortelius, and most extensively William Camden. The chapter shows that this kind of antiquarian assemblage was most commonly conceived as a kind of stitching or tailoring, in keeping with one of the more frequent early modern metaphors for textual and miscellaneous production.
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„Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages“. In Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages, herausgegeben von Paulo S. Pompeu, Cecília G. Leal, Débora R. Carvalho, Nara T. Junqueira, Miriam A. Castro und Robert M. Hughes. American Fisheries Society, 2019. http://dx.doi.org/10.47886/9781934874561.ch15.
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<i>Abstract.</i>—The Brazilian savanna (Cerrado) is a biome of global importance with great endemism and environmental heterogeneity, but it is highly threatened and overexploited. Such a set of conditions is a key aspect of freshwater biodiversity and a challenge to our understanding of species-rich regions. Therefore, we investigated the fish diversity patterns and the effects of different land uses on fish assemblage structure in 155 Cerrado stream sites in four hydrological units. We assessed catchment land use and cover upstream of each sample site, where fish were sampled once during the dry season. Stream fish diversity patterns and the effects of different land uses on assemblage structure differed among the four hydrologic units, and in the region as a whole, but high values of beta diversity due to species turnover were consistently observed. We observed low explanation of land use in relation to fish assemblage structure, probably because of the high level of species turnover and large number of rare species. For some units, the most-correlated land uses were anthropogenic, and alien species were positively related to anthropogenic impacts. Our analysis highlights the importance of the heterogeneous composition of the fish fauna in Brazilian savanna streams and the significance of shifting towards protecting or properly managing whole basins and drainage networks.
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Cohen, Julie E. „Networks, Standards, and Transnational Governance Institutions“. In Between Truth and Power, 202–37. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190246693.003.0008.
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This chapter juxtaposes the various governance processes that have emerged in the domains of world trade, transnational business regulation, and internet governance and treats them explicitly as iterations of an emergent network-and-standard-based legal-institutional form. Network-and-standard-based governance institutions are situated within larger assemblages for transnational legal ordering. Their operations reflect complex and mutually interpenetrating sets of relationships and practices that involve a heterogeneous array of public, private, and public-private actors and associations. The shift to a networked and standard-based governance structure reshapes modes of lawmaking and enforcement, patterns of contestation over lawmaking authority, and structures for participation and accountability in ways that pose important challenges both to the realizability of traditional rule-of-law values and to traditional conceptions of the institutional forms that those values require.
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Tscholl, Michael, Uma Patel und Patrick Carmichael. „(Un)Locating Learning“. In Social and Professional Applications of Actor-Network Theory for Technology Development, 17–30. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2166-4.ch002.
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This paper presents an account of field research into case-based learning in a management course, guided by the questions: ‘what is making change in this setting’, and ‘where is learning located’. Multiple forms of relations between human and nonhuman entities were identified through extensive research, which, analytically does not sit well with more traditional understandings of learning or case-based learning. A critique of those understandings is offered, drawing on concepts from post-modernism and adopting sensibilities from actor-network theory, follow the action in the setting. The authors demonstrate that the case is an assemblage of heterogeneous connections that are made by the teacher and then by the students in the classroom. In working with ANT sensibilities, examination found that tracing the action offers radically different accounts and possibilities for education research and practice. The pragmatic issues in following the action and the challenge of staying coherent and ambivalent are acknowledged.
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Wenn, Andrew. „Topological Transformations“. In Human Centered Methods in Information Systems, 14–38. IGI Global, 2000. http://dx.doi.org/10.4018/978-1-878289-64-3.ch002.
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This chapter describes some aspects of the development of VICNET, an assemblage of computers, cables, modems, people, texts, libraries, buildings, dreams and images. It is a system that is difficult to characterise, it is dynamic both in geographical and ontological scope, size and usage. I have attempted to capture some of its nature through the use of several vignettes that may give the reader a small insight into parts of its being, then using some of the techniques and explanatory and exploratory mechanisms available from the field of science studies such as heterogeneous engineering and Actor Network Theory (ANT), I reveal some of the ways that VICNET came into existence. Many computer systems are undergoing continual evolution and it is extremely difficult to discern their configuration and what objects have agency at any given point in time; they can be thought of as open systems as described by Hewitt and de Jong (1984). VICNET, an Internet information provider established in 1994 as a joint venture between the State Library of Victoria and Royal Melbourne Institute of Technology, is one such system; it is being used by a large number of people and public libraries, yet simultaneously it is evolving and being shaped by the technology, the users and the environment of which it is part. Consider the system, VICNET as it is called, as a node of a much larger network. I have attempted to unfold this node to reveal the social and technical worlds contained therein, but I also fold the VICNET node in itself so that it becomes part of a much larger sociotechnical system – the Internet. This process of folding I refer to as a topological transformation and it is by studying transformations of this type that may help us understand how open systems come into being and evolve. In what follows, I provide a brief background to VICNET and the data collection method I used. Next, I discuss some the analytical techniques that are available for those who wish to study the development of technological systems. Following this all-too-brief comment I then present a selection of vignettes that show the varied nature of this socio-technical system. Presenting these then allows me to develop further the idea of social topologies introduced in the section on analytical techniques. In the final section there is some discussion as to why this way of looking at socio-technical systems may be useful.
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Doraiswamy, L. K. „Microphase-Assisted Reaction Engineering“. In Organic Synthesis Engineering. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195096897.003.0032.
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A relatively recent concept in organic reaction engineering is the use of submicron particles to enhance the rate of a reaction. These are usually microparticles of solids, but can also be microdroplets of liquids, or even microbubbles of gases. They can be external agents, participating reactants, or precipitating solids. In this chapter, we cover the role of small particles as a whole, which may be regarded as constituting an additional colloid-like phase normally referred to as the microphase. We begin by classifying the microphase in terms of its mode of action and then proceed to an analysis of the following categories of importance in organic technology: microslurry of (1) catalyst or adsorbing particles in a reactive mixture; (2) solid reactant particles in a continuous phase of the second reactant; and (3) solid particles precipitating from reaction between two dissolved reactants, one of which can be a solid dissolving and reacting simultaneously with the other reactant. The microphase in the first case is externally added, whereas that in the last two cases is a reactant or a product. The field is still developing (with many unproven theories), and hence we restrict the treatment to a simple analysis of selected situations based on reasonable assumptions (thus avoiding often unjustified complexity). A microphase can be described as an assemblage of very small dispersed phase particles with average size (dp) much less than the diffusional length scale of the solute. Usually dp < l0μm, compared to the diffusional length scale which is of the order of 50-60 μm. Although the microphase is a distinct phase, the phase in which it is present is commonly regarded as pseudohomogeneous. In a stricter sense, however, it should be regarded as a microheterogeneous phase. Indeed, several studies have been reported on modeling heterogeneous microphase systems (Holstvoogd et al., 1986, 1988; Yagi and Hikita, 1987). In view of the ability of the particles of such a system, pseudohomogeneous or pseudoheterogeneous, to get inside the fluid film, they can enhance the transport rate of the solute through the film. Experimental observations in typical gas-liquid and slurry systems have clearly demonstrated (see Ramachandran and Sharma, 1969; Uchida et al., 1975; Sada et al., 1977a,b, 1980; Alper et al., 1980; Pal et al., 1982; Bruining et al., 1986; Bhaskarwar et al., 1986; Bhagwat et al., 1987; Mehra et al., 1988; Mehra and Sharma, 1988a; Hagenson et al., 1994) the enhancing role of a microphase made up of fine particles. The case of a second liquid phase acting as a microphase or of a solid product performing a similar function has also been studied and found to enhance the reaction rate (Janakiraman and Sharma, 1985; Mehra and Sharma, 1985, 1988b; Anderson et al., 1998). Mehra et al. (1988) and Mehra (1990a,b, 1996) presented a detailed account of the role of different types of microphases in rate enhancement. In all these cases, either a microphase is separately introduced or one of the reactants or products acts as a microphase.
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„That’s what more or less has happened to me.’ Has it happened to you? LT: How do you deal with love? Is it a limit, or is it something that’s so explosive it’s not a limit? This thing we feel to be unique when we experience it is so common. Warhol did have love affairs. He did in the last years of his life live with somebody, I believe. I think the kinds of questions you set for yourself around what you’re feeling can stop you from just being able to throw yourself into it. Also, there’s the problem of emotional repetitiveness. PN: There’s a related interest here in breaking with conventional forms of narrative. In one of your later stories, Madame Realism writes in her notebook: ‘Beware of premature closure’ (MR, 147), and this distrust of narratives which are driven by a need for endings is already there in Haunted Houses. LT: Yes, that’s right. PN: And a lot of this depends on how you think about memory. Haunted Houses offers at least two different views: Jane, for example, thinks that ‘there was just as much invention in versions of the past as in what’s written about the future’ (H, 100), while Jimmy wonders whether ‘remembering things keeps you from thinking new thoughts’ (H, 103). LT: I don’t think you have a choice between these two. Memory is in fact very active. A sociologist who read Motion Sickness in manuscript said he was disgusted by it because the narrator was so passive. And I said what do you mean ‘passive’? She thinks all the time. PN: ‘Grace thought her time in bars would lead to something but Lisa said she shouldn’t expect anything to lead to anything’ (H, 146). In Motion Sickness you describe a fight as ‘much less conclusive’ than a prizefight or a baseball game—‘It’s much more like fiction’ (M, 21). How does this inconclusiveness relate to the narrative desire to connect one thing with another? LT: They’re in bed together. You wouldn’t have that desire to connect one thing with another unless there was all this inconclusiveness. Again, it’s the absence of an ability to make a conclusion that draws you to want to make connections. PN: That recalls Gertrude Stein’s comment about any assemblage of heterogeneous things already containing implicit narrative links. LT: I’m sure she was influenced by the Kuleshov experiment in film, that when you edit, you can put images together and no matter what, the viewer makes connections. Take what Tarantino does with narrative in Pulp Fiction. I began to think of it as a kind of time-line being stretched, and the end, what kind of end is that?“ In Textual Practice, 58. Routledge, 2005. http://dx.doi.org/10.4324/9780203986219-24.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Heterogenous assemblages"
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Shockley, Floyd W. „Systematics and natural history of Anamorphidae (Coccinelloidea): Seeking patterns of evolution within a heterogeneous assemblage of “little brown beetles"“. In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.94308.
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Calvez, Philippe, und Eddies Soulier. „“Sustainable assemblage for energy (SAE)” inside intelligent urban areas: How massive heterogeneous data could help to reduce energy footprints and promote sustainable practices and an ecological transition“. In 2014 IEEE International Conference on Big Data (Big Data). IEEE, 2014. http://dx.doi.org/10.1109/bigdata.2014.7004461.
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