2,850 research outputs found
Moral panic and social theory: Beyond the heuristic
Copyright @ 2011 by International Sociological Association.Critcher has recently conceptualized moral panic as a heuristic device, or 'ideal type'. While he argues that one still has to look beyond the heuristic, despite a few exceptional studies there has been little utilization of recent developments in social theory in order to look 'beyond moral panic'. Explicating two current critical contributions - the first, drawing from the sociologies of governance and risk; the second, from the process/figurational sociology of Norbert Elias - this article highlights the necessity for the continuous theoretical development of the moral panic concept and illustrates how such development is essential to overcome some of the substantial problems with moral panic research: normativity, temporality and (un) intentionality
Pair production of Dirac particles in a d+1-dimensional noncommutative space-time
This work addresses the computation of the propability of fermionic particle
pair production in dimensional noncommutative Moyal space. Using the
Seiberg-Witten maps that establish relations between noncommutative and
commutative field variables, to first order in the noncommutative parameter
, we derive the probability density of vacuum-vacuum pair production of
Dirac particles. The cases of constant electromagnetic, alternating
time-dependent and space-dependent electric fields are considered and
discussed.Comment: 12 page
Memórias da Infùncia e da Educação: abordagens eliasianas sobre as mulheres
RelaçÔes sociais entre indivĂduos estĂŁo pautadas pela experiĂȘncia de educação e formação que cada um traz consigo ao longo da vida, pelo modo como se constituem individual e coletivamente. A partir de Elias e da metodologia da histĂłria oral, o objetivo foi buscar nas memĂłrias de infĂąncia de sete mulheres, professoras de crianças, nascidas entre 1950 e 1970, a formação e a educação que se constituiu na infĂąncia em espaços privados e domĂ©sticos. Apreendeu-se que a escolha profissional tem vĂnculos com a educação feminina, normatizada por regras de controle e civilidade
Transferring Electrochemical CO2 Reduction from Semi-Batch into Continuous Operation Mode Using Gas Diffusion Electrodes
The electrochemical reduction of C02 is a promising method for its conversion which still suffers from important challenges that have to be solved before indus trial realization becomes attractive. The optimization of gas diffusion electrodes is described with respect to catalyst dispersion and mass transport limitations allowing solubility issues to be circumvented and current densities to be increased to industrially relevant values. The transfer of the promising results from semi-batch experiments into continuous mode of operation is demonstrated, and it is indiÂcated how the energetic efficiency can be significantly improved by the choice of electrolyte, in terms of concentration and type. Thereby ohmic losses can be decreased and the intrinsic activity be improved
Development and Optimization of Gas Diffusion Electrodes for Electrochemical CO2 Reduction at High Current Density
The electrochemical reduction of CO2 to valuable compounds is a promising approach for its substantial utilization and the storage of electricity in chemical form. At present, the main challenges impeding technical realization are i) low production rates due to mass transport limitations deriving from the low solubility of CO2 in the electrolyte, ii) high overpotentials and poor energetic efficiency, necessitating development of more active catalysts, as well as iii) the demonstration of its continuous production which combines the above with low ohmic losses and long-term stability. Furthermore, hydrogen evolution occurs in the same potential range, and becomes dominating at current densities above 10 mAâcm 2 on conventional metallic electrodes when diffusion of CO2 to the electrode surface becomes rate-determining
Flexible Bayesian Dynamic Modeling of Correlation and Covariance Matrices
Modeling correlation (and covariance) matrices can be challenging due to the
positive-definiteness constraint and potential high-dimensionality. Our
approach is to decompose the covariance matrix into the correlation and
variance matrices and propose a novel Bayesian framework based on modeling the
correlations as products of unit vectors. By specifying a wide range of
distributions on a sphere (e.g. the squared-Dirichlet distribution), the
proposed approach induces flexible prior distributions for covariance matrices
(that go beyond the commonly used inverse-Wishart prior). For modeling
real-life spatio-temporal processes with complex dependence structures, we
extend our method to dynamic cases and introduce unit-vector Gaussian process
priors in order to capture the evolution of correlation among components of a
multivariate time series. To handle the intractability of the resulting
posterior, we introduce the adaptive -Spherical Hamiltonian Monte
Carlo. We demonstrate the validity and flexibility of our proposed framework in
a simulation study of periodic processes and an analysis of rat's local field
potential activity in a complex sequence memory task.Comment: 49 pages, 15 figure
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