13 research outputs found
Adaptive development and maintenance of user-centric software systems
A software system cannot be developed without considering the various facets of its environment. Stakeholders â including the users that play a central role â have their needs, expectations, and perceptions of a system. Organisational and technical aspects of the environment are constantly changing. The ability to adapt a software system and its requirements to its environment throughout its
full lifecycle is of paramount importance in a constantly changing environment. The continuous involvement of users is as important as the constant evaluation of the system and the observation of evolving environments. We present a methodology for adaptive software systems development and
maintenance. We draw upon a diverse range of accepted methods including participatory design, software architecture, and evolutionary design. Our focus is on user-centred software systems
Imaging of Flames in Cement Kilns To Study the Influence of Different Fuel Types
The
cement industry aims to use an increased amount of alternative
fuels to reduce production costs and CO<sub>2</sub> emissions. In
this study three cement plants firing different kinds and percentages
of alternative fuel were studied. A specially developed camera setup
was used to monitor the flames in the three cement kilns and assess
the effect of alternative fuels on the flame. It was found that cofiring
with solid recovered fuel (SRF) would delay the ignition point by
about 2 m and lower the intensity and temperature of the kiln flame
compared to a fossil fuel flame. This is related to a larger particle
size and moisture content of the alternative fuels, which lowers the
conversion rate compared to fossil fuels. The consequences can be
a lower kiln temperature and cement quality. The longer conversion
time may also lead to the possibility of localized reducing conditions
in the cement kiln, which can have a negative impact on the clinker
quality and process stability. The burner design may alleviate some
of the issues encountered with SRF cofiring. At one of the test plants
the burner was changed from a design with an annular channel for axial
air to a jet design. This proved to be beneficial for an early ignition
and improved dispersion of the fuel and led to an increase in cement
quality and higher use of SRF