Browsing by Subject "Ageing"
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Item Open Access Involving the elderly in the design process: a participatory design model for usability, safety and attractiveness(Bilkent University, 1999) Demirbilek, OyaThis work presents a conceptual model involving the elderly users into the design process by means of participatory design sessions, where the expertise of designers and the real requirements and opinions of elderly end-users, related to how objects, environments and equipment should be designed to allow ageing in place are collected and filtered through Quality Function Deployment matrixes. Two different design sessions are done for the groups of elderly end-users. The scope has been limited to the design of doors and door handles for domestic use. In the first design session, the end-users are asked to talk about and to ‘design’ the doors and door handles of the house they want to age-in, considering all their possible requirements, needs, particular wishes, and ideas. This is a combination of brain storming, scenario building and unstructured interviews. The output of the first session provides a basis to design the mentioned products. The second session consists of presenting to the same group of end-users the various design concepts created, according to the output of the first session. The concepts are again discussed, remarks, preferences, and new ideas collected to further improve the design.Item Open Access Solid-solution of Cd(formula)Zn(formula)S nanocrystals in the channels of mesostructured silica films(Bilkent University, 2006) Akdoğan, YaşarMesostructured silica can be used as a reaction medium to produce solidsolution of Cd1-xZnxS nanocrystals as thin films. These films were synthesized from oligo(ethylene oxide) non-ionic surfactant (CH3(CH2)11(OCH2CH2)10OH, (C12EO10)), cadmium and zinc nitrate salts ([Cd(H2O)4](NO3)2 and [Zn(H2O)6](NO3)2), water, and tetramethylorthosilicate (TMOS, as silica source) mixtures using a liquid crystalline templating (LCT) approach and metal containing liquid crystalline (MLC) mesophase. Metal ion to surfactant mole ratio was 1.0 which determines the stability and structure of the mesostructured silica. The mesostructured silica film has a 3D hexagonal structure with oriented channels. The silica pore size can be controlled by controlling ageing temperature and time. The pore diameter of the silica channels that aged at room temperature (RT) for two days is 4.7 nm and the one aged at 2500 C for 30 minutes is 3.3 nm. Cd(II) and Zn(II) incorporated film samples can be reacted at RT under H2S atmosphere to produce zinc blend, Cd1-xZnxS nanocrystals (nano-Cd1-xZnxS-meso-SiO2) in the channels of the mesostructured silica. The band gaps of the nano-Cd1- xZnxS-meso-SiO2 vary between 2.6 eV for CdS and 4.1 eV for ZnS. The Cd (II) rich nanoparticles are larger (4.4 nm) than Zn (II) rich nanoparticles (3.1 nm). The silica wall thickness that can be controlled by ageing at different temperatures confines the growth of the Cd1-xZnxS nanocrystals in the pores. By controlling the size of the silica channel between 4.7 and 3.3 nm, one can control the band-gap of the CdS nanocrystals between 2.6 and 2.8 eV.