228 research outputs found
Crafting Critical Heritage Discourses into Interactive Exhibition Design
This paper argues how a more reflective design practice that embraces critical discourses can transform interactive exhibition design and therefore the museum visiting experience. Four framing arguments underpin our exhibition design making: the value of materiality, visiting as an aesthetic experience, challenging the authorized voice, and heritage as a process. These arguments were embodied through design, art and craft practice into one interactive exhibition at a house museum. We draw from our design process discussing the implications that adopting an approach informed by critical heritage debates has on exhibition design and suggest three sensitizing concepts (polyvocal narratives, dialogical interaction, interweaving time and space) bridging the practice of interactive exhibition design and critical heritage theory
Spatio-Temporal Dynamics of Yeast Mitochondrial Biogenesis: Transcriptional and Post-Transcriptional mRNA Oscillatory Modules
Examples of metabolic rhythms have recently emerged from studies of budding
yeast. High density microarray analyses have produced a remarkably detailed
picture of cycling gene expression that could be clustered according to
metabolic functions. We developed a model-based approach for the decomposition
of expression to analyze these data and to identify functional modules which,
expressed sequentially and periodically, contribute to the complex and intricate
mitochondrial architecture. This approach revealed that mitochondrial
spatio-temporal modules are expressed during periodic spikes and specific
cellular localizations, which cover the entire oscillatory period. For instance,
assembly factors (32 genes) and translation regulators (47 genes) are expressed
earlier than the components of the amino-acid synthesis pathways (31 genes). In
addition, we could correlate the expression modules identified with particular
post-transcriptional properties. Thus, mRNAs of modules expressed
âearlyâ are mostly translated in the vicinity of
mitochondria under the control of the Puf3p mRNA-binding protein. This last
spatio-temporal module concerns mostly mRNAs coding for basic elements of
mitochondrial construction: assembly and regulatory factors. Prediction that
unknown genes from this module code for important elements of mitochondrial
biogenesis is supported by experimental evidence. More generally, these
observations underscore the importance of post-transcriptional processes in
mitochondrial biogenesis, highlighting close connections between nuclear
transcription and cytoplasmic site-specific translation
Valorisation of agricultural biomassâash with CO2
This work is part of a study of different types of plant-based biomass to elucidate their capacity for valorisation via a managed carbonation step involving gaseous carbon dioxide (co2). the perspectives for broader biomass waste valorisation was reviewed, followed by a proposed closedâloop process for the valorisation of wood in earlier works. the present work newly focusses on combining agricultural biomass with mineralised co2. Here, the reactivity of selected agricultural biomass ashes with co2 and their ability to be bound by mineralised carbonate in a hardened product is examined. three categories of agricultural biomass residues, including shell, fibre and soft peel, were incinerated at 900 ± 25 °C. The biomass ashes were moistened (10% w/w) and moulded into cylindrical samples and exposed to 100% CO2 gas at 50% RH for 24 h, during which they cemented into hardened monolithic products. the calcia in ashes formed a negative relationship with ash yield and the microstructure of the carbonateâcementing phase was distinct and related to the particular biomass feedstock. this work shows that in common with woody biomass residues, carbonated agricultural biomass ashâbased monoliths have potential as novel lowâcarbon construction products
Conductivity/activation energy relationships for cement-based materials undergoing cyclic thermal excursions
The electrical conductivity of a range of concrete
mixes, with and without supplementary cementitious
materials (SCM), is studied through multiple cycles of
heating and cooling over the extended temperature range
-30/?70 C. When presented in an Arrhenius format, the
experimental results display hysteresis effects at the lowtemperature
end of the thermal cycle and, in those concretes
containing supplementary cementitious materials at
higher water/binder ratios, hysteresis effects were evident
over the entire temperature range becoming more discernible
with increasing number of thermal cycles. The
depression in both the freezing and thawing point could be
clearly identified and was used to estimate pore-neck and
pore-cavity radii. A simplified approach is presented to
evaluate the volumetric ratio of frozen pore water in terms
of conductivity measurements. The results also show that
the conductivity and activation energy of the concrete
specimens were related to the water/binder ratio, type of
SCM, physical state of the pore water and the thermal
cycling regime
Ocean sprawl facilitates dispersal and connectivity of protected species
Highly connected networks generally improve resilience in complex systems. We present a novel application of this paradigm and investigated the potential for anthropogenic structures in the ocean to enhance connectivity of a protected species threatened by human pressures and climate change. Biophysical dispersal models of a protected coral species simulated potential connectivity between oil and gas installations across the North Sea but also metapopulation outcomes for naturally occurring corals downstream. Network analyses illustrated how just a single generation of virtual larvae released from these installations could create a highly connected anthropogenic system, with larvae becoming competent to settle over a range of natural deep-sea, shelf and fjord coral ecosystems including a marine protected area. These results provide the first study showing that a system of anthropogenic structures can have international conservation significance by creating ecologically connected networks and by acting as stepping stones for cross-border interconnection to natural populations
Choix de la composition optimale d'un borate de lithium dans la préparation des perles pour analyses par fluo-X
La technique de fusion en analyse par fluorescence X qui est maintenant d'usage courant dans le cas de composés oxydés, a commencé à le devenir dans le cas de composés sulfurés et le sera bientÎt dans le cas des métaux. Quel que soit le cas, il s'agit toujours de dissolution d'oxydes dans un fondant. Des expériences récentes ont montré qu'il est possible de prévoir la composition d'un borate de lithium qui rende maximale la limite de solubilité d'un oxyde donné et qui diminue les risques de cristallisation dans la gamme de composition comprise entre le tétraborate et le métaborate. Pour des oxydes basiques, la solubilité est maximale dans le tétraborate. Pour les oxydes trÚs acides, la solubilité est maximale dans le métaborate, mais une limitation existe. Les oxydes des autres métaux préfÚrent nettement un fondant prÚs de la composition 50/50 tétra/méta borate. Une théorie simple est proposée.Fusion has become widely used for the analysis of oxidized samples by X-ray fluorescence, is starting for sulfide materials and soon will be used for metals. After oxidation, al1 those materials are fused as oxides. Experiments have been made to determine the more appropriate flux composition (Li borates) that ensures maximal solubility and minimal risk of crystallisation for any given oxide. For basic oxides, Li tetraborate is best. For acidic oxides, Li metaborate would be best but is limited to high concentrations of sample only. All other oxides prefer a flux composition close to the 50/50 tetra/meta borate composition. A simple theory has been developped
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