1,722,191 research outputs found
Underweight vs. overweight/obese: which weight category do we prefer? Dissociation of weight‐related preferences at the explicit and implicit level
Full text linkSummary Objective: Although stigma towards obesity and anorexia is a well‐recognized problem, no research has investigated and compared the explicit (i.e. conscious) and implicit (i.e. unconscious) preferences between these two conditions. The present study conducted this investigation in a sample of 4,806 volunteers recruited at the Project Implicit website (https://implicit.harvard.edu). Methods: Explicit and implicit preferences were assessed among different weight categories (i.e. underweight, normal weight and overweight/obese) by means of self‐reported items and the Multi‐category Implicit Association Test, respectively. Results: Preferences for the normal weight category were found both at the explicit and implicit levels when this category was compared with overweight/obese and underweight categories. On the contrary, when the underweight category was contrasted with the obese/overweight category, results differed at the explicit and implicit levels: pro‐underweight preferences were observed at the explicit level, while pro‐overweight/obese preferences were found at the implicit level. Conclusions: These results indicate that preferences between overweight/obese and underweight categories differ at the explicit and implicit levels. This dissociation may have important implications on behaviour and decision‐making.Version of Recor
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Energetical, environmental and economical feasibility analysis of a wind powered desalination plant in Sardinia
No full textOn a class of weighted Gauss-type isoperimetric inequalities and applications to symmetrization
No full textWe solve a class of weighted isoperimetric problems with Gaussian type weight. As a consequence, we prove a comparison result for the solutions of degenerate elliptic equations
Performance Analysis of a Wind Powered Gas Storage System - ASME Paper GT2010-22638
No full textAll over the world huge masses of gas are compressed in a
number of storage stations to compensate seasonal fluctuations
of the users’ demand versus the methane extraction from
geological deposits. In the great majority of such plants, turbocompressors
are used, namely centrifugal machines. Since in
this kind of machines compression is essentially adiabatic, gas
temperature rises up even to dangerous values. Natural gas
cannot be injected into the reservoirs too hot without risk of
geological damage, so often an after-cooler has to be provided.
Natural gas compressors are driven by gas turbines (GT),
fuelled by part of the gas flowing through the station; otherwise
electric motors connected to the general grid are used.
In the paper the exploitation of the renewable energy of the
wind to drive the compressors of the system is proposed. The
matching with the driving wind turbine is different from the
matching with a gas turbine or an electric motor. However
whereas the stochastic character of the wind source affects
power generation seriously, in the proposed use it is not a real
problem: the only constraint consists of having enough wind
energy to complete a charge all over a season.
An in-house code, based on the lumped parameter
approach and a quasi-steady dynamics, has been developed in
order to simulate the system performance during a complete
charge for a known wind distribution. The turbo-compressor is
modeled through its characteristic maps. Similarly the wind
turbines, that drive the storage station, and the fans, that
counterbalance the friction losses of the after-cooler, are
replaced with their characteristic curves. The after-cooler,
which is a gas-air compact heat exchanger, is modeled by
means of the overall heat transfer coefficient and the total
pressure losses. Finally the reservoir is supposed omothermal
and isothermal.
In order to investigate the plant performance, different
kinds of wind distributions have been considered and the
corresponding operation paths as well as power and pressure
evolutions are shown and discussed
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