15,127 research outputs found
Analytical BPS Maxwell-Higgs vortices
We have established a prescription for the calculation of analytical vortex
solutions in the context of generalized Maxwell-Higgs models whose overall
dynamics is controlled by two positive functions of the scalar field. We have
also determined a natural constraint between these functions and the Higgs
potential allowing the existence of axially symmetric
Bogomol'nyi-Prasad-Sommerfield (BPS) solutions possessing finite energy.
Furthermore, when the generalizing functions are chosen suitably, the
nonstandard BPS equations can be solved exactly. We have studied some examples,
comparing them with the usual Abrikosov-Nielsen-Olesen (ANO) solution. The
overall conclusion is that the analytical self-dual vortices are well-behaved
in all relevant sectors, strongly supporting the generalized models they belong
themselves. In particular, our results mimic well-known properties of the usual
(numerical) configurations, as localized energy density, while contributing to
the understanding of topological solitons and their description by means of
analytical methods.Comment: 8 pages, 4 figure
MetaCity: ways of thinking and making city
Metacity launched the challenge of reflecting on the âimplicitâ and mostly âinvisibleâ drivers that influence urban transformation. The call asked participants to explore the nexus between scientific knowledge, political and economic actors and social mobilization in the production of contemporary urban space. Questions were raised: What concepts, methods and fields of knowledge â instituted or to be established â can and will inform urban development theory(s) and practice(s) in the near future? What types of urban knowledge are still considered legitimate and what is their relevance? How public policies, governance practices and development strategies had change cities and how can we re-think these instruments? What, after all, is the effective importance of political and social mobilization of urban scientists and technicians in the process of âmaking citiesâ? We were
pleased to received several contributions from different disciplines and geographies that have shown these are cross-cutting issues on a global scale. Some of these contributions were collected in this book and we will briefly present their main subjects.info:eu-repo/semantics/publishedVersio
Renal abscesses in childhood: report of two uncommon cases
Renal abscesses are rare conditions in children, but they must be remembered in differential diagnosis of fever and abdominal pain. The authors report two paediatric cases with unusual presentation. Case 1: a 15-year-old girl was admitted following a period of fever, vomiting and left hypochondrium pain which became more localised to the left lower ribs. Blood tests suggested bacterial infection, but urinalysis and culture were negative. Renal CT scan presented features of bilateral pyelonephritis and left renal abscesses, while ultrasound remained normal until the ninth day of disease. Case 2: a 2-year-old girl, with diagnosis of ÎČ-thalassemia minor, had intermittent diffuse abdominal pain with 2â
weeks of evolution. Renal ultrasonography and CT scan showed a heterogeneous mass compatible with Willms tumour. Intraoperative diagnosis was compatible with renal abscess with isolation of Proteus mirabilis in the fluid. Both responded well to long-term antibiotics and to surgical drainage (in the second case)
Rede Brasil Arroz: transferĂȘncia de tecnologia integrando as regiĂ”es produtoras.
O projeto liderado pela Embrapa Arroz e FeijĂŁo, denominado Rede Brasil Arroz-RBA, iniciado em 2011, teve como premissa buscar o equilĂbrio em termo de qualidade do arroz produzido nas diferentes regiĂ”es e sistemas e na transferĂȘncia de prĂĄticas sustentĂĄveis
The impact of cyberloafing and physical exercise on performance: a quasi-experimental study on the consonant and dissonant effects of breaks at work
This study aims to examine the consonant and dissonant effects that cyberloafing and physical exercise may have on individualsâ performance as activities of occupying rest breaks at work. Built upon an innovative perspective, a laboratory quasi-experimental study was developed where a total of 124 participants performed two different tasksâa cognitive task measuring errors and omissions and a motor task. Their performance was evaluated after a cyberloafing or physical exercise break. Aligned with the cognitive dissonance theory, results revealed that physical exercise breaks had a positive effect on motor performance. Conscientiousness and engagement also presented a medium effect size, suggesting a trend to moderate the impact of cyberloafing breaks on cognitive performance. Theoretical and practical implications, as well as limitations of the study and areas for future research, were also explored.info:eu-repo/semantics/acceptedVersio
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