58 research outputs found
A systematic comparison of continuous and discrete mixture models
Modellers are increasingly relying on the use of continuous random coefficients models, such as Mixed
Logit, for the representation of variations in tastes across individuals. In this paper, we provide an indepth
comparison of the performance of the Mixed Logit model with that of its far less commonly used
discrete mixture counterpart, making use of a combination of real and simulated datasets. The results not
only show significant computational advantages for the discrete mixture approach, but also highlight
greater flexibility, and show that, across a host of scenarios, the discrete mixture models are able to offer
comparable or indeed superior model performance
The liberalisation of maritime transport and the island regions in EU. Evidence from Greece
The liberalisation of maritime transport constitutes a substantial and vital progress not only in the
maritime transport market but also in influencing the development of distant island regions. In the
European Union (EU), the establishment of the legal framework and policy regarding the liberalisation is
standing from the year of 1992. In Greece, the first attempt to harmonize the inevitable political and state
framework was in 2001 (2932/2001 Act). Prevailing factors encumbered the liberalisation planning and
implementing, mainly because of the incoherent procedures applied and the partial cover of principal
issues regarding impingement of public interests and goods relative to island development.
In our paper, we provide strongly support to the argument that the major initiative considering the
development of island regions throughout European territory is that European Policy for the liberalisation
of maritime transport should be oriented to the distinctive needs of island regions. Moreover, we provide
a “road map” for completion of the liberalisation procedures. Hence, we address specific proposals and
measures towards the healing of the inadequate regional development
The social dimension of globalization: A review of the literature
With globalization affecting so many inter-connected areas, it is difficult to grasp its full impact. This literature review of over 120 sources considers the impact of globalization on wages and taxes, poverty, inequality, insecurity, child labour, gender, and migration. Opening with some stylized facts concerning globalization in 1985-2002, the authors then highlight recent findings on these areas, reporting on controversies and on emerging consensus where it exists. There follows a review of national and international policy responses designed to make globalization more sustainable and equitable and to deliver decent jobs, security and a voice in decision-making
Stability of split flow fans
The
performance requirements of turbofan engines demands a
stability and transient capability beyond that associated with
the
past generations of gas turbine engines. The axial flow fan
unit is most vulnerable to
loading limitations due to the
primary problems associated with the compression process, its
sensitivity to inlet distortion and the
difficulty to design
for an overall
optimum blade duty in a machine of wide
radial
blade
loading distribution. The development of mathematical
models with some
capability of predicting the stable operating
range of an axial flow fan has to overcome the
difficulties
associated with the
modelling of the radially distinct
flow
regions and their dynamic interaction. '
The current
investigation combined the available knowledge of
one-dimensional models (based on the
principles of conservation
of mass, linear momentum and
energy) with the assumptions of the
parallel compressor theory, in order to develop a linearized
system of equations for stability analysis (surge prediction).
The
stability conditions which emerged from this approach were
applied on the experimentally derived characteristics of a low
hub to
tip ratio split flow fan in a manner which involved the
modelling of the dynamic interaction of the inner and outer flow
region of the fan.
The
development of the governing equations was achieved by
applying one-dimensional flow analysis to the inner and outer
section of the fan. Their interaction was modelled on the
experimentally obtained radial movement of the splitter
streamline and the
discharge ,static pressure 'radial
distribution. The inner and outer region were treated as a
lumped volume element search operating on a local masflow
averaged total pressure rise characteristic and alternatively
acting in conjunction with a common nozzle and separate nozzles.
The experimental investigation was carried out on a low hub
totipratio two-stage split flow fan(with the facility of
independent bypass and core throttles)in order to examine the
localised and overall performance of such a fan(and the
staling processes involved)and to enable the application of
the stability analysis. The influence of reducing the distance
between the fan flow spliter and the last bladerowasal so
investigated,
«The mathematical mode1s predicted the point of dynamic
instability within 4.52 of the experimental observed mas flow
rate and pressure is value
Psychometric assessment: A case study of Greek merchant marine officers using the MMPI-2
Stability of split flow fans
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