1000 resultados para grinding media
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I avhandlingen granskas den debatt som fördes om seriemediet och serieläsandet i Finland från början av 1950-talet till början av 1960-talet. Serietidningen var då ett nytt medium och föranledde en oro beträffande barns läsvanor. ”Seriefrågan” diskuterades i pressen och problematiken engagerade barnskyddsorganisationer och forskare, behandlades i riksdagen och undersöktes av en statlig kommitté. De olika debattuttrycken analyseras i studien. Avhandlingens teoretiska perspektiv är styrningsanalytiskt och bygger på diskussionen om regementalitet (governmentality). I studien granskas hur seriemediet, barndom och regleringen av dessa kom att definieras i behandlingen av det s.k. serieproblemet. Serierna definierades som ett problematiskt medium på ett flertal sätt. De huvudsakliga argumenten mot serierna var dels att de förstörde barns läsförmåga, dels att de budskap som serierna förmedlade till barnen var av fel slag. Enligt kritiken var serierna språkligt fattiga och innehållsmässigt alltför våldsamma. Följaktligen utgjorde serierna ett hot mot barnen. Barnen kom ur detta perspektiv att definieras som inkompetenta medieanvändare och i behov av skydd. I debatten upplyftes olika sätt att lösa och reglera problemet. Man undersökte problematiken och upplyste allmänheten om den, man försökte påverka serieutgivarna och man påkallade censur. Seriedebatten och den verksamhet som debattörerna ägnade sig åt ledde dock inte till synbara resultat, t.ex. ny lagstiftning eller förändringar i seriemarknaden. Ändå dog debatten i början av 1960-talet. Problemet med de serieläsande barnen hanterades m.a.o. genom själva debatten. Samtidigt uteblev mera drastiska former av reglering. Ett övergripande syfte för analysen av den kunskap som skapades i debatten – dess varierande förståelse av seriemedium, barndom och reglering – är att erbjuda infallsvinklar till aktuella diskussioner om och farhågor angående barns mediebruk. Med fokus på bredden hos debattens uttryck och de diskursiva ramarna för problematiseringen av barns serieläsande ger avhandlingen perspektiv på den med jämna mellanrum uppdykande frågeställningen om barns mediebruk.
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The objective of this Bachelor's Thesis is to find out the role of social media in the B-to-B marketing environment of the information technology industry and to discover how IT-firms utilize social media as a part of their customer reference marketing. To reach the objectives the concepts of customer reference marketing and social media are determined. Customer reference marketing can be characterized as one of the most practically relevant but academically relatively overlooked ways in which a company can leverage its customers and delivered solutions and use them as references in its marketing activities. We will cover which external and internal functions customer references have, that contribute to the growth and performance of B-to-B firms. We also address the three mechanisms of customer reference marketing which are 'status transfer', 'validation through testimonials' and 'demonstration of experience and prior performance'. The concept of social media stands for social interaction and creation of user-based content which exclusively occurs through Internet. The social media are excellent tools for networking because of the fast and easy access, easy interaction and vast amount of multimedia attributes. The allocation of social media is determined. The case company helps clarify the specific characteristics of social media usage as part of customer-reference-marketing activities. For IT-firms the best channels to utilize social media in their customer reference marketing activities are publishing and distribution services of content and networking services.
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Novel biomaterials are needed to fill the demand of tailored bone substitutes required by an ever‐expanding array of surgical procedures and techniques. Wood, a natural fiber composite, modified with heat treatment to alter its composition, may provide a novel approach to the further development of hierarchically structured biomaterials. The suitability of wood as a model biomaterial as well as the effects of heat treatment on the osteoconductivity of wood was studied by placing untreated and heat‐treated (at 220 C , 200 degrees and 140 degrees for 2 h) birch implants (size 4 x 7mm) into drill cavities in the distal femur of rabbits. The follow‐up period was 4, 8 and 20 weeks in all in vivo experiments. The flexural properties of wood as well as dimensional changes and hydroxyl apatite formation on the surface of wood (untreated, 140 degrees C and 200 degrees C heat‐treated wood) were tested using 3‐point bending and compression tests and immersion in simulated body fluid. The effect of premeasurement grinding and the effect of heat treatment on the surface roughness and contour of wood were tested with contact stylus and non‐contact profilometry. The effects of heat treatment of wood on its interactions with biological fluids was assessed using two different test media and real human blood in liquid penetration tests. The results of the in vivo experiments showed implanted wood to be well tolerated, with no implants rejected due to foreign body reactions. Heat treatment had significant effects on the biocompatibility of wood, allowing host bone to grow into tight contact with the implant, with occasional bone ingrowth into the channels of the wood implant. The results of the liquid immersion experiments showed hydroxyl apatite formation only in the most extensively heat‐treated wood specimens, which supported the results of the in vivo experiments. Parallel conclusions could be drawn based on the results of the liquid penetration test where human blood had the most favorable interaction with the most extensively heat‐treated wood of the compared materials (untreated, 140 degrees C and 200 degrees C heat‐treated wood). The increasing biocompatibility was inferred to result mainly from changes in the chemical composition of wood induced by the heat treatment, namely the altered arrangement and concentrations of functional chemical groups. However, the influence of microscopic changes in the cell walls, surface roughness and contour cannot be totally excluded. The heat treatment was hypothesized to produce a functional change in the liquid distribution within wood, which could have biological relevance. It was concluded that the highly evolved hierarchical anatomy of wood could yield information for the future development of bulk bone substitutes according to the ideology of bioinspiration. Furthermore, the results of the biomechanical tests established that heat treatment alters various biologically relevant mechanical properties of wood, thus expanding the possibilities of wood as a model material, which could include e.g. scaffold applications, bulk bone applications and serving as a tool for both mechanical testing and for further development of synthetic fiber reinforced composites.
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Kirja-arvio
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http://www.igi-global.com/book/media-ubiquitous-era/49581