395 resultados para Geopolymer mortar


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Gambling is emerging as a major industry around the world at a time when many of the more traditional economic pursuits are becoming less productive, but while the burgeoning gambling industry is certainly profitable and provides good investment opportunities and economic benefits for business and communities alike, it is timely that we look more closely at the overall benefits and costs of this phenomenon in modern society.

In this book about the modern gambling business, a motif of the Colorado River and the Boulder/Hoover Dam is explored in the opening section, likening the benefits and risks of gambling to those of the damming of the Colorado to irrigate California. There can be no doubt that the project wrested many Americans from poverty and unemployment in the depression, built a world-leading engineering structure that served to help the desert bloom, so to speak, including, of course, the re-making of Las Vegas. With the wisdom of hindsight and our increasing environmental awareness, the choking of the Colorado has had its downsides as does the gambling industry as we already know.

From the metaphorical re-examination of Fear and Loathing in Las Vegas, this current book focuses on some of the central aspects of the gambling industry in Australia and around the world, exploring how the industry is traveling in the 21st Century and asking why we are becoming so pre-occupied at this time with the processes of gambling. The prevalence of problem gambling is discussed; the numbers and how they are measured, along with various approaches to treatment and remediation for people affected adversely by their gambling behaviour.

Beyond the ‘bricks and mortar’ gambling and the electronic gaming machines of the latter part of the twentieth century, however, the development of new on-line gambling technologies is introducing different types of products, inducting new consumers to gambling products, changing the face of gambling in society, driving greater profits and potentially spawning more associated problems. While we are still struggling to understand the mechanisms through which more traditional gambling mechanisms affect consumers of these products and how best to remediate or treat such problems, a new form of the gambling phenomenon is being loosed upon modern consumers.

To return to the Hoover Dam metaphor; perhaps this new flood will be too strong for the dam or perhaps it will bring profits and benefits for all concerned. Before we can arrive at a decision about such potential costs and benefits, however, it will be important for us to see just whose money fuels this next phase of industry expansion and whether the profits of the industry are won at the cost of people with gambling problems; people who can’t afford to play the game, let along lose. Will the players in Macau, Singapore, Hong Kong, Vegas, Atlantic City, Sydney and other emerging markets in Asia, along with the new generation of consumers of on-line gambling products, at the end of the day see that their play has been worth the price paid or will the losses to individuals and communities out-weigh the benefits that flow, paradoxically, from this complex industry?

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An important challenge for brick-and-mortar retail businesses is how to monitor the interest of customers in displays and products in a store. We investigate the effectiveness of the Microsoft Kinect as a sensor to monitor the behaviour of pedestrians, which may reflect their interest in a store display or advertisement. In a controlled environment, participants acting as pedestrians are requested to show different levels of interest as they pass an object that is being monitored by a Kinect sensor. The sensor collected measurements such as the positions and orientation of the pedestrian's body and head, which were analysed to detect the movements of the pedestrians and thus infer the behaviour they exhibited. Our results demonstrate that when the Kinect is able to detect a behaviour that indicates a pedestrian's interest in an object, then the classification of the level of interest in terms of the type of behaviour is reasonably accurate under varying light conditions and numbers of pedestrians.

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To finance transportation infrastructure and to address social and environmental negative externalities of road transports, several countries have recently introduced or consider a distance based tax on trucks. In competitive retail and transportation markets, such tax can be expected to lower the demand and thereby reduce CO2 emissions of road transports. However, as we show in this paper, such tax might also slow down the transition towards e-tailing. Considering that previous research indicates that a consumer switching from brick-and-mortar shopping to e-tailing reduces her CO2 emissions substantially, the direction and magnitude of the environmental net effect of the tax is unclear. In this paper, we assess the net effect in a Swedish regional retail market where the tax not yet is in place. We predict the net effect on CO2 emissions to be positive, but off-set by about 50% because of a slower transition to e-tailing.

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L'industrie du ciment est l'une des principales sources d'émission de dioxyde de carbone. L'industrie mondiale du ciment contribue à environ 7% des émissions de gaz à effet de serre dans l'atmosphère. Afin d'aborder les effets environnementaux associés à la fabrication de ciment exploitant en permanence les ressources naturelles, il est nécessaire de développer des liants alternatifs pour fabriquer du béton durable. Ainsi, de nombreux sous-produits industriels ont été utilisés pour remplacer partiellement le ciment dans le béton afin de générer plus d'économie et de durabilité. La performance d'un additif de ciment est dans la cinétique d'hydratation et de la synergie entre les additions et de ciment Portland. Dans ce projet, deux sous-produits industriels sont étudiés comme des matériaux cimentaires alternatifs: le résidu de silice amorphe (RSA) et les cendres des boues de désencrage. Le RSA est un sous-produit de la production de magnésium provenant de l'Alliance Magnésium des villes d'Asbestos et Thedford Mines, et les cendres des boues de désencrage est un sous-produit de la combustion des boues de désencrage, l'écorce et les résidus de bois dans le système à lit fluidisé de l'usine de Brompton située près de Sherbrooke, Québec, Canada. Récemment, les cendres des boues de désencrage ont été utilisées comme des matériaux cimentaires alternatifs. L'utilisation de ces cendres comme matériau cimentaire dans la fabrication du béton conduit à réduire la qualité des bétons. Ces problèmes sont causés par des produits d'hydratation perturbateurs des cendres volantes de la biomasse quand ces cendres sont partiellement mélangées avec du ciment dans la fabrication du béton. Le processus de pré-mouillage de la cendre de boue de désencrage avant la fabrication du béton réduit les produits d'hydratation perturbateurs et par conséquent les propriétés mécaniques du béton sont améliorées. Les approches pour étudier la cendre de boue de désencrage dans ce projet sont : 1) caractérisation de cette cendre volante régulière et pré-humidifiée, 2) l'étude de la performance du mortier et du béton incorporant cette cendre volante régulière et pré-humidifiée. Le RSA est un nouveau sous-produit industriel. La haute teneur en silice amorphe en RSA est un excellent potentiel en tant que matériau cimentaire dans le béton. Dans ce projet, l'évaluation des RSA comme matériaux cimentaires alternatifs compose trois étapes. Tout d'abord, la caractérisation par la détermination des propriétés minéralogiques, physiques et chimiques des RSA, ensuite, l'optimisation du taux de remplacement du ciment par le RSA dans le mortier, et enfin l'évaluation du RSA en remplacement partiel du ciment dans différents types de béton dans le système binaire et ternaire. Cette étude a révélé que le béton de haute performance (BHP) incorporant le RSA a montré des propriétés mécaniques et la durabilité, similaire du contrôle. Le RSA a amélioré les propriétés des mécaniques et la durabilité du béton ordinaire (BO). Le béton autoplaçant (BAP) incorporant le RSA est stable, homogène et a montré de bonnes propriétés mécaniques et la durabilité. Le RSA avait une bonne synergie en combinaison de liant ternaire avec d'autres matériaux cimentaires supplémentaires. Cette étude a montré que le RSA peut être utilisé comme nouveaux matériaux cimentaires dans le béton.

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The development of simple and rapid new approaches for analysing microbial communities colonising Cultural Heritage materials is pivotal for its safeguard. Fluorescence in situ hybridisation technique using ribosomal RNA directed probes (RNA-FISH) has demonstrated a great potential for this purpose. A protocol for analysing filamentous fungi in mortars has been already developed in previous studies. In this work this protocol has been adapted for detecting bacteria and yeasts. Good results have been obtained for the analysis of suspensions of isolates. In this way, the optimized protocol was applied in microsamples from synthetic mortar artificially inoculated with yeast and bacterial isolates. Promising results have been obtained for the ex situ analysis of yeast and bacteria thriving in mortar microsamples.