A theoretical study on the performance of steady state bubbling
fluidized bed burners is presented using a simple mathematical model. The
proposed model has pedagogical and practical advantages due to its simplicity.
The calculations, whose results are plotted in several graphics, were based on
data obtained in laboratory scale experiments. The experiments were carried out
with wood chars and the model allows a proper evaluation of physical and
chemical phenomena taking place inside the reactor, as well as a fast approach
to the pre-design phase, before going towards more complex and time consuming
numerical modeling. In the first part of the paper the steady state modeling is
compared with the combustion of successive batches of char particles.
Afterwards, the performance of a 1 m
diameter bed operating from 700℃ to 800℃ is shown.
Let be a compact Finsler manifold of hyperbolic
type, and be its universal Finslerian covering. In this
paper we show that the growth function of the volume of geodesic balls of is of purely exponential type.
Under a broad comprehension of
Software Engineering, it is preferred the term software life cycle instead of
just software production. The reason is that cycle starts at software conception
and stops when the software is relegated. Given contemporary companies’ market
strategies of focusing on their competitive advantages, most of them have
externalized their software production to outsourced services. Therefore, the
call for software tenders has become a common step in the software life cycle.
In this paper, we present a tool which aids non-experts to specify call for
software tenders. The motivation was Chile situation of most of rural and
semi-urban city halls which do not have engineering teams to build call for
software tenders. We describe the problem in terms of lack of competitiveness
and empty biddings generated by low quality calls for tenders. As a second
step, we show the technical considerations to develop the proposed tool and its
features. We include an initial tool perception from a first group of users.