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Euro Inox, the European Stainless Steel Development Association.
Year: 2014 Publisher: Euro Inox.

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Een online bibliotheek over eigenschappen en toepassingen van roestvast staal, met toegang tot andere informatiebronnen wereldwijd.


Book
Measuring digital media trends in flanders : digimeter rapport 7. Mediatechnologie- en ict-gebruik in Vlaanderen
Year: 2014 Publisher: iMinds - digiMeter

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Digimeter is een onderzoeksinitiatief van iMinds dat op een systematische manier data ter beschikking wil stellen aan haar onderzoeksgroepen en projectpartners inzake bezit en gebruik van media- en ICT-technologieën in (digitaal) Vlaanderen. Digimeter is een jaarlijkse monitoring van het bezit en gebruik van media & ICT in Vlaanderen op basis van een bevraging bij een representatief staal Vlamingen. 'Media' en 'ICT' zijn uiteraard heel brede begrippen. De focus van Digimeter beperkt zich voornamelijk tot de recente (digitale) mediatechnologieën. In 2014 werden 2028 Vlamingen bevraagd, dit zowel online als offline. We stellen vast dat er voor de meeste toestellen en technologieën verzadiging optreedt, met smartphones en tablets als uitzondering op de regel. In Vlaanderen hebben 9 op 10 mensen toegang tot het internet en tot een computer in hun huishouden. Een derde beschikt over een spelcomputer en 86% heeft digitale tv thuis. De adoptie van deze technologieën toont slechts een beperkte groei en lijkt daardoor te stagneren. Alleen de adoptie van smartphones en de toegang tot een tablet in het huishouden vertonen een significante groei. Het volledige rapport (in het Engels) is beschikbaar op aanvraag bij iMinds.

Keywords

691 Informatiebeleid --- ICT --- E-books


Book
Psychology for Teachers
Authors: ---
ISBN: 9781446211144 9781446211151 Year: 2014 Publisher: Los Angeles SAGE

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Sustainable materialisation of residues from thermal processes into construction materials : construction materials from stainless steel slags
Authors: ---
ISBN: 9789460188602 Year: 2014 Publisher: Leuven Katholieke Universiteit Leuven

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The amount of slag generated is almost athird of the total stainless steel produced. Owing to its mineralogy, a large partof the slag is produced as fines, which has a very low valorisation potentialand has to be landfilled. The present work is aimed at exploring the potentialof these slags to produce construction materials of higher economic value.To address the issue, two valorisationroutes were applied: 1) alkali-activation initiating binding reactions in theslag by the addition of alkali hydroxides and silicates, 2) carbonation initiating hardening reaction in the slag by the formation of alkalicarbonates. Two stainless steel slags, continuous casting (CtCs) slag and Argonoxygen decarburisation (AOD) slag, were targeted for valorisation.Initiation of hardening reactions in theslag was found to occur only under a combined treatment of alkali (Na and K)hydroxides and high temperature (80 &#176;C) which was provided by steam curing. However,only a moderate strength in the mortar specimens was observed under suchconditions along with appearance of efflorescence with NaOH for molaritiesabove 5 M. The problem of low strength and efflorescence in the mortar sampleswas eliminated by the introduction of silicates in the system along with thealkali hydroxides. The compressive strength of the slag mortars was found toincrease with the increase in the amount of silicates in the activatingsolution and with the increase of the curing temperature. The reaction productfrom the activation was found to be C-S-H as confirmed by thermogravimetric,QXRD, FTIR and 29Si NMR analysis.The slag was also found to develop strengthunder acceleration carbonation conditions which was provided under two environments:i) in a carbonation chamber, maintained at atmospheric pressure, 22 &#176;C, 5 vol.%CO2 and 80% RH; and ii) in a carbonation reactor, where the CO2partial pressure (pCO2)and temperature could be further increased. It was found that in thecarbonation chamber the compressive strength of the samples and the CO2sequestration continued to increase up to 3 weeks whereas in the reactor theoptimum for strength and CO2 sequestration was found at 80 &#176;C, 8 barpressure in 2.5 h. The major reaction product was found to be calcite indifferent morphologies.Three types of masonry blocks were preparedform the slag with the two valorisation routes: alkali-activated solid bricks,perforated carbonated bricks and alkali-activated aerated bricks. Thecarbonated bricks were found to have the best resistance to freeze-thaw,whereas the aerated bricks were found to have superior thermal resistivity values.The LCA showed that the environmental impact of the bricks is lower (negativefor carbonated bricks) than the conventional clay fired bricks and the impactof the aerated bricks was found to be similar to the conventional aeratedblocks available in the market. A SWOTanalysis highlighted the advantage of using these bricks in the form of lowerenergy requirement in its production, reduction of stress on the use of prime materialsand ease of metal recovery from the residual slag.The results of the dissertation show that thebinding potential of the stainless steel slags can be exploited as valorisedapplications in the construction industry by novel thermo-alkali activation andcarbonation processes.

Onderzoeksrapport Apestaartjaren 5.
Author:
Year: 2014 Publisher: Gent Apestaartjaren. Is een project van Mediaraven en Linc,

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Book
Meaning of online problematic situations for children : results of qualitative cross-cultural investigation in nine European countries
Authors: ---
Year: 2014 Publisher: London EU Kids Online, London School of Economics and Political Science

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Book
Simón Vélez
Author:
ISBN: 9780956823809 0956823807 Year: 2014 Publisher: Cambridge Office of London Architecture and Urbanism

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Architect Simón Vélez (b.1949 in Manizales, Colombia) has pioneered the use of structural bamboo since he first started out on his own at the age of 23. An extraordinary draughtsman with an intuitive sense of structural engineering, he has built over 250 structures using structural bamboo or guadua. Simón Vélez has designed structural bamboo buildings in Germany, France, the United States, Brazil, Mexico, China, Jamaica, Colombia, Ecuador and India. He has been invited by the Vitra Design Museum in Germany and the Georges Pompidou Centre in France, to conduct masterclasses. In 2000, he was asked to construct a large pavilion in structural bamboo in Hannover, Germany for the World Expo. Building this pavilion alongside his friend and contemporary Shigeru Ban's paper cardboard tube pavilion for the same site, Vélez's circular bamboo structure, which was 40 metres in diameter, used over 3,500 structural bamboo stems. Forty workers flown in from Colombia built this pavilion, for which no heavy machinery such as cranes was required despite the scale of the building operations. Vélez's buildings exude the language of human craftsmanship, a tradition that has rapidly lost validity in the heavily mechanised construction environment of the western world. Simón Vélez sees himself in the tradition of the master-builder working with a guild of highly skilled craftsmen, with the architect at the top of the hierarchy. Often this collaboration between architect and builder produces an incredible flexibility in the construction of buildings as decisions are made and changed while the building is going up on site. A highly dynamic sole practitioner, Simón Vélez's body of work stands out, not only for his highly charged 'signature' - his buildings inevitably carry indelible marks of his creativity - but also for the drawing process through which structures are produced from the day that they are conceived to being executed on site. Simón Vélez's practice raises critical questions about contemporary, western architectural practice where the typology of the site has almost become invisible. Since most work is drawn digitally in an office environment as opposed to Vélez's intense manual processes on site, the site as an architectural typology has disappeared. It has become another piece of graphic entity on a computer screen to be manipulated mostly in an office environment. Simón Vélez's working methods constitute long stretches of drawing on site and the communication of these drawings on site, to the craftsmen through conversations. Simón Vélez is perhaps one of the last remaining practitioners of the process where the human hand is the origin of an entire architecture. This book endeavours to question critically the validity of what we have lost and what we have gained with the onset of the digital era. In December 2009, Simón Vélez received The Principal Prince Claus Award for his contribution to a positive interaction between culture and nature. This prestigious Dutch award, founded by Prince Claus, was awarded to Simón Vélez for his combination of innovation, traditional references and sustainability, while managing to create a contemporary architecture that reflects modern sensibilities and desires."

Keywords

Colombia --- Vélez, Simón --- 691.1 --- Bamboe


Multi
Interactions between cement and combined concrete admixtures : the influence on cement paste rheology
Authors: ---
ISBN: 9789460188589 Year: 2014 Publisher: Leuven Katholieke Universiteit Leuven

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During the last decades, innovative concrete applications have been the result of technological developments as new processing techniques, the use of concrete admixtures and advanced materials. All these improvements increase the demand for better performing concrete with enhanced workability. However, the lack of reliable engineering tools in traditional concrete production methods has led to some inconsistent control of the workability. Therefore, todays research is increasingly investigating advanced models that capture the flow behavior of fresh concrete as accurately as possible. These models are continuously improving but generally keep facing problems which are linked to the agglomeration of the cement particles and to the implementation of combined concrete admixtures. The objective of this work is to investigate the rheological mechanism in cement paste for the combined use of superplasticizer, retarder and accelerator. In particular, an effect on the particle agglomeration is aimed for in order to contribute to a more fundamental understanding of the concretes flow behavior. Concerning the superplasticizer impact on cement paste, thermodynamic modelling and mineralogy studies led to the conclusion that the superplasticizer can change the hydrate morphology to such an extent that the interparticle contact forces are modified. The extra addition of retarder led to a densified polymer layer at the cement grain surface which contributed to the steric stabilization of the cement paste. An additional electrostatic effect and the induced changes in hydrate morphology are also demonstrated to contribute to the low paste viscosity. With the extra addition of a calcium salt accelerator to the cement paste, an interstitial structure was assumed to diminish the rheological effect of the polymer layer.All the developed conceptual mechanisms were implemented in a coherent agglomeration model, based on measurable parameters. In this model, the internal and external hydrates in a cement agglomerate were defined and quantified. Generally, the cumulative amount of hydrates within the agglomerates influenced the agglomerate stability and the amount of external hydrates determined the reagglomeration rate. For the superplasticizer only, a proportional relation was found between the change in agglomeration rate and the external agglomerate connectivity while, for the extra addition of retarder and accelerator, a reverse relation was found. The latter was attributed to a mechanical contribution of the interstitial volume. On the one hand, the retarder creates a source of slowly hydrating nuclei and particles in that volume and, on the other hand, these particles are expected to coagulate due to the accelerator addition. In the second case, the interstitial volume also delivered a contribution to the stress resistance of the cement paste at rest.This fundamental research combines dedicated analytical methods and conceptual models to improve the understanding of particle agglomeration and contributes to a more extensive insight into the concrete rheology.


Book
Architektur und Kalksandstein 2014.
Author:
Year: 2014 Publisher: Hannover Bundesverband Kalksandsteinindustrie,

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Book
Architektur und Kalksandstein 2014.
Author:
Year: 2014 Publisher: Hannover Bundesverband Kalksandsteinindustrie

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