19,407 research outputs found
Immigrantsâ Entrepreneurial Opportunities: The Case of the Chinese in Portugal
Why do some foreign nationalities seem to have entrepreneurial initiatives and others donât? Why do certain foreign communities tend to build an ethnic economy, and others melt in the economy of the reception country? The analysis made so far of the modes of incorporation of the different Chinese immigrant communities in Portugal allowed to evidence that, unlike what some authors defend, it is not only the cultural factors that channel immigrants into certain segments of the labour market. Several structural factors associated to these immigrantsâ arrival should be considered: the immigration policy of the host society; the reasons that generated the migratory flow; the existence of a co-ethnic community in the country and its economic incorporation; the operation of social networks; the possibility to acquire capital among the community (informal resources); and the potential market of the host society. Furthermore, in Portugal, as in Southern Europe, the informal economy can be an opportunity to self-employment - not so easy in North European countries where institutional control is stronger and competition is higher.Immigrants, Entrepreneurship, Structural opportunities, Ethnic resources
Roughness exponents and grain shapes
In surfaces with grainy features, the local roughness shows a crossover
at a characteristic length , with roughness exponent changing from
to a smaller . The grain shape, the choice of
or height-height correlation function (HHCF) , and the procedure to
calculate root mean-square averages are shown to have remarkable effects on
. With grains of pyramidal shape, can be as low as 0.71,
which is much lower than the previous prediction 0.85 for rounded grains. The
same crossover is observed in the HHCF, but with initial exponent
for flat grains, while for some conical grains it may
increase to . The universality class of the growth process
determines the exponents after the crossover, but has no
effect on the initial exponents and , supporting the
geometric interpretation of their values. For all grain shapes and different
definitions of surface roughness or HHCF, we still observe that the crossover
length is an accurate estimate of the grain size. The exponents obtained
in several recent experimental works on different materials are explained by
those models, with some surface images qualitatively similar to our model
films.Comment: 7 pages, 6 figures and 2 table
Phase diagram of a 2D Ising model within a nonextensive approach
In this work we report Monte Carlo simulations of a 2D Ising model, in which
the statistics of the Metropolis algorithm is replaced by the nonextensive one.
We compute the magnetization and show that phase transitions are present for
. A phase diagram (critical temperature vs. the entropic
parameter ) is built and exhibits some interesting features, such as phases
which are governed by the value of the entropic index . It is shown that
such phases favors some energy levels of magnetization states. It is also
showed that the contribution of the Tsallis cutoff is essential to the
existence of phase transitions
Contributos para a implementação do sistema de gestão de energia numa unidade industrial de transformação e embalamento de arroz
Este documento apresenta os resultados obtidos atravĂ©s do contributo da implementação de um sistema de gestĂŁo da energia segundo os critĂ©rios e requisitos normativos da ISO 50001:2011, numa unidade industrial de transformação e embalamento de arroz. A aplicação deste referencial normativo deve ter como objetivos apoiar no planeamento das açÔes decorrentes da gestĂŁo de energia, pela monitorização e controlo dos consumos energĂ©ticos, bem como, identificar medidas de eficiĂȘncia energĂ©tica.
Na necessidade da empresa fazer face Ă previsĂŁo do aumento da capacidade produtiva e da redução dos custos associados aos consumos de energia, foi designada uma equipa de gestĂŁo de energia que teve como objetivos, a certificação do sistema gestĂŁo da energia na empresa e consequentemente, reduzir os custos atravĂ©s de medidas para melhoria da eficiĂȘncia energĂ©tica.
Os resultados desta implementação foram francamente positivos. Conseguiu-se uma melhoria do desempenho energético em 2015 de 28% face aos valores da primeira medida de gestão da energia, realizada em 2012, ao abrigo da legislação nacional em vigor.
O sistema de gestĂŁo conseguiu nos primeiros dois anos de execução nĂŁo sĂł a certificação de conformidade por uma entidade externa, como tambĂ©m, proporcionou Ă empresa uma redução de 15 % dos valores de consumo especĂfico face aos valores do ano de referĂȘncia.
De um modo geral, a empresa com a implementação deste sistema reduziu os custos energéticos. Esta redução permite aumentar a competitividade no mercado. Assim assegura-se um crescimento da empresa sustentado na gestão de recursos e numa maior diversidade de clientes
Treatment of surface water inoculated with Aspergillus species using ultraviolet radiation and photocatalytic membrane reactors
"Limited attention has been given to the presence of fungi in the aquatic environment when compared to other microorganisms such as bacteria and virus. Our previous research showed that fungi occur widely in drinking water sources and described many fungi species that have not been previously reported in the aquatic environment. Moreover, many filamentous fungi species present in water were found to be able to grow at high temperatures and have conidia measurements lower than 5 ”m, being therefore considered as potential pathogenic species to humans and animals. (...)
Age-adjusted validation of the most stringent criteria for active surveillance in low-risk prostate cancer patients
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El sud tranquil: el cas de Portugal
A Portugal nomĂ©s un de cada vint-i-cinc habitants Ă©s estranger. PolĂtiques força estrictes i centralitzades han marcat lâestabilitat del paĂs. Destaca una marcada voluntat dâintegrar als immigrants
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