The functional significance of multiple nest-building in the Australian Reed Warbler Acrocephalus australis

The vast majority of bird species build a nest in which to breed. Some species build more than one nest, but the function of most multiple nest-building remains unclear. Here we describe the unusual nest-building behaviour of the Australian Reed Warbler Acrocephalus australis, and test experimentally the hypotheses that multiple nest-building is related to individual condition or territory quality, and plays a role in mate assessment. Australian Reed Warblers built two types of nest structures: 'type I' nests, which were used for eggs and nestlings, and 'type II' nests, which were structurally distinct from type I nests, did not support eggs, nestlings or adults and were not essential for successful breeding. The number of type II nests built in each territory varied. Type II nests were only built before breeding had commenced in a territory and females were not observed participating in their construction, supporting a role in female mate choice. Birds provided with supplementary food built significantly more type II nests than control birds. However, supplementary-fed birds did not have greater pairing success, and the addition of further type II nests to territories did not increase the pairing rate or type II nest construction in those territories. There was no relationship between the presence of type II nests and either reproductive success or likelihood of nest predation. We discuss the implications of these results in light of previous suggestions regarding the function of multiple nest-building in birds.

The politics of place : citing and re-siting the Palazzo Littorio, Mussolini’s new Fascist Party headquarters in Rome

In 1934 and in 1937, two rounds of a major architectural competition were held for the Palazzo Littorio, the new Fascist Party Headquarters in Rome to be built in the heart of the ancient city and measuring its architectural worth against the Colosseum itself. Once the second round was announced, foreign and domestic policy shifted towards a more repressive climate and Italy had become an Empire. The processes behind the competitions represent the relationship between architecture and consent, the establishment and development of a ‘Fascist’ style, the Monumentalism versus Rationalism debate and increasing Party influence over artistic expression.

The brain in the jar : troubling the truths of discourses of adolescent brain development

Ideas about adolescent brains and their development increasingly function as powerful truths in making sense of young people. And it is the knowledge practices of the neurosciences and evolutionary and developmental psychology that are deemed capable of producing what we have come to understand as the evidence on which policy, interventions and education should be built. In effect these discourses reduce young people to little more than a brain in a jar. The paper examines how the evidence about adolescent brains - their volume, and the functioning and activity of different regions - from neuroscience and evolutionary and developmental psychology works as truth. What knowledge practices are used to produce this evidence, or are deemed capable of producing this evidence? What truth claims are able to attach to this evidence? What makes it true and why is it imagined as evidence of something that is true in policy, public and other research settings that are often far removed from where it was produced? I argue that the discourses of adolescent brain development disembody, reduce and simplify the complexities of these figures we know as adolescents. In effect they render the adolescent as a brain in a jar.

The role of community activism in the sustainable development of coastal communities : the Nepean Conservation Group Inc, a case study

The Nepean Conservation Group Inc (NCG) was formed in 1973. The jurisdiction of the NCG covers the whole the Nepean Peninsula, the tiny sliver of land between Port Phillip Bay and Bass Strait, at the end of the Mornington Peninsula, Victoria, Australia. Much of the Nepean Peninsula is moonah woodland. The NCG Constitution states that their primary object is “To make every effort to ensure that the land and waters of the Sorrento Portsea Blairgowrie Area are used with wisdom and foresight and that the competing demands upon them are resolved in the best long terms interests thereof …” The NCG deals with issues as diverse as vegetation and development overlays; heritage; townscapes; public access; neighbourhood character; hooded plovers; historic towns and fire protection. The NCG coordinates Friends Groups that care for bushland parks and coastal reserves, for flora and fauna, on the Nepean Peninsula. The NCG is an advocate for a dynamic fragile coast. Implicit is an expectation that such a local community group is the guardian of their coastal environment. After thirty-eight years of dedicated voluntary work it is timely to reconsider the role of community activism in the sustainable development of coastal regions and towns. This paper examines a number of significant recent issues: public rights to access; subdivision; historic coastal town development and fire protection. The author acknowledges the NCG Committee for their support and access to the NCG papers and archives. This case study is situated in a larger ongoing research investigation.

One-size-fits-all housing : an exploration of 6-star requirements in the volume builder sector

Energy consumption attributed to the residential sector makes up around 8% of the total consumption in Australia. Roughly a third of all houses built in Victoria are done so by the largest 20 builders. These volume builders keep costs down by offering a selection of ‘clone’ designs from which the client can choose, however they lose the site-specific customisation which is required for effective passive design in favour of a one-size-fits-all approach where designs are developed to a point where they can satisfy just the minimum requirements in a range of orientations and site locations. The Australian government has implemented regulations regarding the minimum efficiency standards for housing and these initiatives to limit the carbon emissions have brought the question of energy use to the table, yet are they enough? This paper will explore the concept of cloned house designs in terms of energy efficiency and optimal siting and through computer simulation, evaluate how a cloned house design performs under different site conditions in Victoria.

Ships, planes and automobiles – the perils and pluses of place - making in an outer Melbourne suburb

Building a new suburb is increasingly seen as creating a “place” as well as a set of houses and neighbourhoods. Developers view “place-making” as a way to differentiate one estate from another and to capture a market segment; planners see the practice as the basis of good master planning. Local governments too support the concept to give residents a sense of pride and identity. While usually seen as a contemporary exercise, imprinted on the blank slate of greenfield sites, the experience of at least one outer suburb suggests that place-making is as much historical as contemporary and may be both a welcome element of a community and a focus of disaffection. The example of Point Cook in Melbourne’s west offers a range of iconic “places” – historical and contemporary markers of identity and difference – which have formed both the basis of local pride but also tension. Thus the RAAF base, Point Cook Homestead and Werribee Mansion long pre-dated the expansion of the city but they have been embraced as centres of pride, historical achievement and as tourist attractions. In contrast, a massive pirate-ship playground built in the centre of a park by a developer as a marker of difference and centre of community attraction was widely appreciated before being burned to the ground! This paper will report on a sample of resident experiences of place-making in outer suburban Melbourne which highlights some of the local complexities of place-making.

The Temperature and Humidity in a Low-Flow Anesthesia Workstation With and Without a Heat and Moisture Exchanger

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Application of abrupt cut-off models in the analysis of the capacitance spectra of conjugated polymer devices

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Optimization of photo-polymerized sol gel monolithic stationary phases prepared in polyacrylate-coated fused-silica capillaries for capillary electrochromatography

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Changes in coral reef communities and an associated reef fish species, Cephalopholis cruentata (Lacepede), after 30 years on Curacao (Netherlands Antilles)

Using the same methodology and identical sites, we repeat a study dating from 1973 and quantify cover of hard coral species, soft corals, sponges, hard substratum and soft substratum, and density of a commercially important reef fish species, the graysby Cephalopholis cruentata, along a depth-gradient of 3-36 m oil the coral reefs of Curacao. The objective was to determine the multi-decade change in benthic coral reef cover and structural complexity, and their effect oil densities of an associated reef fish species. Total hard coral cover decreased on average from 52% in 1973 to 22% in 2003, representing a relative decline of 58%. During this time span, the cover of hard substratum increased considerably (from 11 to 58%), as did that of soft corals (from 0.1 to 2.2%), whereas the cover of sponges showed no significant change. Relative decline of hard coral cover and of reef complexity was greatest in shallow waters (near the coast), which is indicative of a combination of anthropogenic influences from shore and recent storm damage. Cover of main reef builder coral species (Agaricia spp., Siderastrea siderea, Montastrea annularis) decreased more than that of other species, and resulted in a significant decrease in reef complexity. Although density of C. cruentata was highly correlated to cover of Montastrea and Agaricia in 1973, the loss of coral cover did not show any effect on the total density of C. cruentata in 2003. However, C. cruentata showed a clear shift in density distribution from shallow water in 1973 to deep water in 2003. It call be concluded that the reefs of Curacao have degraded considerably in the last three decades, but that this has had no major effect on the population size of one commercially important coral-associated fish species.

Particle Competition and Cooperation in Networks for Semi-Supervised Learning with Concept Drift

Concept drift is a problem of increasing importance in machine learning and data mining. Data sets under analysis are no longer only static databases, but also data streams in which concepts and data distributions may not be stable over time. However, most learning algorithms produced so far are based on the assumption that data comes from a fixed distribution, so they are not suitable to handle concept drifts. Moreover, some concept drifts applications requires fast response, which means an algorithm must always be (re) trained with the latest available data. But the process of labeling data is usually expensive and/or time consuming when compared to unlabeled data acquisition, thus only a small fraction of the incoming data may be effectively labeled. Semi-supervised learning methods may help in this scenario, as they use both labeled and unlabeled data in the training process. However, most of them are also based on the assumption that the data is static. Therefore, semi-supervised learning with concept drifts is still an open challenge in machine learning. Recently, a particle competition and cooperation approach was used to realize graph-based semi-supervised learning from static data. In this paper, we extend that approach to handle data streams and concept drift. The result is a passive algorithm using a single classifier, which naturally adapts to concept changes, without any explicit drift detection mechanism. Its built-in mechanisms provide a natural way of learning from new data, gradually forgetting older knowledge as older labeled data items became less influent on the classification of newer data items. Some computer simulation are presented, showing the effectiveness of the proposed method.

Micromechanics of dentin/adhesive interface in function of dentin depth: 3d finite element analysis

Objectives: The aim of this study was to analyze the stress distribution on dentin/adhesive interface (d/a) through a 3-D finite element analysis (FEA) varying the number and diameter of the dentin tubules orifice according to dentin depth, keeping hybrid layer (HL) thickness and TAǴs length constant. Materials and Methods: 3 models were built through the SolidWorks software: SD - specimen simulating superficial dentin (41 x 41 x 82 μm), with a 3 μm thick HL, a 17 μm length Tag, and 8 tubules with a 0.9 μm diameter restored with composite resin. MD - similar to M1 with 12 tubules with a 1.2 μm diameter, simulating medium dentin. DD - similar to M1 with 16 tubules with a 2.5 μm diameter, simulating deep dentin. Other two models were built in order to keep the diameter constant in 2.5 μm: MS - similar to SD with 8 tubules; and MM - similar to MD with 12 tubules. The boundary condition was applied to the base surface of each specimen. Tensile load (0.03N) was performed on the composite resin top surface. Stress field (maximum principal stress in tension - σMAX) was performed using Ansys Wokbench 10.0. Results: The peak of σMAX (MPa) were similar between SD (110) and MD (106), and higher for DD (134). The stress distribution pathway was similar for all models, starting from peritubular dentin to adhesive layer, intertubular dentin and hybrid layer. The peak of σMAX (MPa) for those structures was, respectively: 134 (DD), 56.9 (SD), 45.5 (DD), and 36.7 (MD). Conclusions: The number of dentin tubules had no influence in the σMAX at the dentin/adhesive interface. Peritubular and intertubular dentin showed higher stress with the bigger dentin tubules orifice condition. The σMAX in the hybrid layer and adhesive layer were going down from superficial dentin to deeper dentin. In a failure scenario, the hybrid layer in contact with peritubular dentin and adhesive layer is the first region for breaking the adhesion. © 2011 Nova Science Publishers, Inc.

Apontamentos acerca das vicissitudes da subjetividade no mito de Don Juan

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Carbon paste electrode modified with ascorbic acid and carbon nanotubes for determination copper in sugar cane spirit

This work has been carried out in order to determine the copper content in sugar cane spirit samples from the south of Minas Gerais, using a carbon paste electrode modified with ascorbic acid and carbon nanotubes using the square wave voltammetry technique. The following parameters were studied: Ed (deposit potencial). Td (deposit time), f (frequency), A (amplitude) and ΔEs (increment scanning). The analytical curve was built in an interval from 0.5 to 12 mg L-1 and a coefficient of linear correlation of 0.997 Three sugar cane spirit samples were analysed, which presented copper content ranging from 0.29 to 1.59 mg L-1.

A Dinâmica da ocupação pioneira na rodovia Transamazônica: uma abordagem de modelos de paisagem

Pós-graduação em Geografia - IGCE