323 research outputs found
Creativity at work: The role of context
Viewing creativity in context stresses the need to explore how creativity
is really defined by organisational actors engaged in creative processes,
whether these be related to product innovation or other types of innovation.
That which in some cases might be viewed as a powerful influencing
context factor, may in other instances be seen as just another
company practice. Likewise, differences across organic units within the
same company are probably better examined by looking at the historical
and spatial pattern developed over time between individual actors
and groups, as well as their unique set of contextual factors. The same
reasoning can be extended to an analysis of creativity in industries and
in national cultures. Only by taking into account the actors’ perspective
of context, can researchers be permitted to fully comprehend the interplay between the creative person and his/her context.
To summarise, this chapter has addressed creativity in context, and
offered some additional thoughts that may be used by researchers to
continue to investigate the socio-psychological view of creativity.info:eu-repo/semantics/publishedVersio
Interpreting measures of tuberculosis transmission : a case study on the Portuguese population
Background: Tuberculosis remains a high burden for Human society despite considerable investments in its control. Unique features in the history of infection and transmission dynamics of tuberculosis pose serious limitations on the direct interpretation of surveillance data and call for models that incorporate latent processes and simulate specific interventions.Methods: A transmission model was adjusted to the dataset of active tuberculosis cases reported in Portugal between 2002 and 2009. We estimated key transmission parameters from the data (i.e. time to diagnosis, treatment length, default proportion, proportion of pulmonary TB cases). Using the adjusted model to the Portuguese case, we estimated the total burden of tuberculosis in Portugal. We further performed sensitivity analysis to heterogeneities in susceptibility to infection and exposure intensity.Results: We calculated a mean time to diagnose of 2.81 months and treatment length of 8.80 months in Portugal. The proportion defaulting treatment was calculated as 0.04 and the proportion of pulmonary cases as 0.75. Using these values, we estimated a TB burden of 1.6 million infected persons, corresponding to more than 15% of the Portuguese population. We further described the sensitivity of these estimates to heterogeneity.Conclusions: We showed that the model reproduces well the observed dynamics of the Portuguese data, thus demonstrating its adequacy for devising control strategies for TB and predicting the effects of interventions
A Comparative Study of Pentaquark Interpolating Currents
In a diquark-diquark-antiquark picture of pentaquarks, we use two
interpolating currents to calculate the mass of the recently measured
state in the framework of QCD sum rules. We show that, even though
yielding similar values for (and close to the experimental
value), these currents differ from each other in what concerns the strength of
the pole, convergence of the OPE and sensitivity to the continuum threshold
parameter.Comment: 19 pages, 8 figures, replaced version accepted for publication in
Phys. Lett.
Pentaquark Decay in QCD Sum Rules
In a diquark-diquark-antiquark picture of the pentaquark we study the decay
within the framework of QCD sum rules. After evaluation of
the relevant three-point function, we extract the coupling
which is directly related to the pentaquark width. Restricting the decay
diagrams to those with color exchange between the meson-like and baryon-like
clusters reduces the coupling constant by a factor of four. Whereas a small
decay width might be possible for a positive parity pentaquark, it seems
difficult to explain the measured width for a pentaquark with negative parity.Comment: 14pages, 5 eps figures. Contribution to the proceedings of LC200
Are and the Roper resonance diquark-diquark-antiquark states?
We consider a current in the QCD sum rule framework to study
the mass of the recently observed pentaquark state , obtaining
good agreement with the experimental value. We also study the mass of the
pentaquark . Our results are compatible with the interpretation
of the state as being the Roper resonance N(1440), as suggested
by Jaffe and Wilczek.Comment: 9 pages RevTex4 and 3 eps figures. Revised version accepted for
publication in Phys. Lett.
Water deficit effect on the accumulation of biomass and artemisinin in annual wormwood(Artemisia annua L., Asteraceae)
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