Domain walls inside localised orientifolds

The equations of motion of toroidal orientifold compactifications with fluxes are in one-to-one correspondence with gauged supergravity if the orientifold (and D-brane) sources are smeared over the compact space. This smeared limit is identical to the approximation that ignores warping. It is therefore relevant to compare quantities obtained from the gauged supergravity with the true 10d solution with localised sources. In this paper we find the correspondence between BPS domain walls in gauged SUGRA and 10D SUGRA with localised sources. Our model is the simplest orientifold with fluxes we are aware of: an O6/D6 compactification on T^3/Z_2 in massive IIA with H_3-flux. The BPS domain walls correspond to a O6/D6/NS5/D8 bound state. Our analysis reveals that the domain wall energy computed in gauged SUGRA is unaffected by the localisation of the O6/D6 sources.Comment: 26 pages, 1 figur

Microstructure observations during the spring 2011 STRATIPHYT-II cruise in the Northeast Atlantic

Small-scale temperature and conductivity variations have been measured in the upper 100 m of the northeast Atlantic during the STRATIPHYT-II cruise (Las Palmas–Reykjavik, 6 April–3 May 2011). The measurements were done at midday and comprised 2 to 15 vertical profiles at each station. The derived turbulent quantities show a transition between weakly-stratified (mixed layer depth, MLD, <100) and well-mixed waters (MLD > 100), which was centered at about 48° N. The temperature eddy diffusivities, <I>K<sub>T</sub></I>, range from 10<sup>−5</sup> to 10<sup>0</sup> m<sup>2</sup> s<sup>−1</sup> in the weakly-stratified stations, and range from 3 × 10<sup>−4</sup> to 2 × 10<sup>0</sup> m<sup>2</sup> s<sup>−1</sup> in the well-mixed stations. The turbulent kinetic energy dissipation rates, ε, range from 3 × 10<sup>−8</sup> to 2 × 10<sup>−6</sup> m<sup>2</sup> s<sup>−3</sup> south of the transition zone, and from 10<sup>−7</sup> to 10<sup>−5</sup> m<sup>2</sup> s<sup>−3</sup> north of the transition zone. The station-averaged <I>K<sub>T</sub></I> values throughout the mixed layer increase exponentially with the wind speed. The station-averaged ε values throughout the mixed layer scale with the wind stress similarity variable with a scaling factor of about 1.8 in the wind-dominated stations (ε ≈ 1.8 <I>u</I><sub>☆</sub><sup>3</sup>/(−κ<I>z</I>)). The values of <I>K<sub>T</sub></I> and ε are on average 10 times higher compared to the values measured at the same stations in July 2009. The results presented here constitute a unique data set giving large spatial coverage of upper ocean spring turbulence quantities

Mundane dynamics:Understanding collaborative governance approaches to ‘big’ problems through studying ‘small’ practices

Collaborative approaches to governance, policymaking, and administration are believed to provide means of adequately handling wicked problems. Simultaneously, many scholars have acknowledged the difficulty of collaboration in practice. In this article, we argue that understanding the ‘small’ practices of collaborative governance and actor-positioning processes illuminates why collaborative governance is such a challenging response to wicked problems. Instead of focussing on ‘big’ collaborative approaches to ‘big’ wicked problems, zooming in on mundane dynamics demonstrates the continuous work that governing and positioning processes require, exposing the provisional nature of elements that have been argued to be vital, such as mutual trust, reciprocity, long-term commitment, authority, or autonomy. Lastly, the mundane uncovers the importance of the material, spatial, and temporal organisation of actor-positioning processes and the potential of language to inhibit or enable collaborative governance. The article ends with a reflection on how analyses of mundane dynamics may help scholars, practitioners, policymakers, and citizens to understand their own processes of engagements in collaborative endeavours and possibly temper expectations.</p

Mundane dynamics:Understanding collaborative governance approaches to ‘big’ problems through studying ‘small’ practices

Collaborative approaches to governance, policymaking, and administration are believed to provide means of adequately handling wicked problems. Simultaneously, many scholars have acknowledged the difficulty of collaboration in practice. In this article, we argue that understanding the ‘small’ practices of collaborative governance and actor-positioning processes illuminates why collaborative governance is such a challenging response to wicked problems. Instead of focussing on ‘big’ collaborative approaches to ‘big’ wicked problems, zooming in on mundane dynamics demonstrates the continuous work that governing and positioning processes require, exposing the provisional nature of elements that have been argued to be vital, such as mutual trust, reciprocity, long-term commitment, authority, or autonomy. Lastly, the mundane uncovers the importance of the material, spatial, and temporal organisation of actor-positioning processes and the potential of language to inhibit or enable collaborative governance. The article ends with a reflection on how analyses of mundane dynamics may help scholars, practitioners, policymakers, and citizens to understand their own processes of engagements in collaborative endeavours and possibly temper expectations.</p

Cervicofacial Actinomycosis in the Pediatric Population: Presentation and Management

Background: Infection caused by Actinomyces species is a rare cause of head and neck infection in children. This chronic cervicofacial infection can present with localized swelling, abscess formation, sinus drainage and can be complicated by osteomyelitis. Methods: Presented are 2 pediatric cases of secondary actinomycosis in the context of congenital lesions: 1 patient with a previously excised preauricular sinus and another with a persistent sublingual mass. A comprehensive literature search was conducted for reported cases of pediatric actinomycosis in the cervicofacial region. Results: Both cases presented were successfully treated with a combination of complete surgical excision of the lesions and prolonged antibiotic therapy. Thirty-four pediatric cases of cervicofacial actinomycosis are reviewed, 2 presented herein, and 32 from the published literature. There was equal gender distribution and the median age was 7.5 years. The most common site for infection was the submandibular area. Four (12%) of cases arose in pre-existing congenital lesions. Most patients were treated with penicillin-based antibiotics for a median duration of 6 months following surgical excision or debridement. Conclusions: Actinomycosis is a rare infection of the cervicofacial region; secondary infections arising from congenital lesions of the head and neck are even more rare. A previously excised pre-auricular sinus and a sublingual dermoid cyst are not previously reported sites of infection. Actinomycosis should be suspected in chronically draining sinuses of the head and neck region and confirmed through anaerobic culture. Osteomyelitis is a potential complication and magnetic resonance (MR) imaging is warranted. Long-term antibiotic therapy with a penicillin-based antibiotic and surgical excision should be considered

Diverging business strategies towards climate change : a USA-Europe comparison for four sectors of industry

The research project has investigated what strategies specific sectors of industry develop to limit greenhouse gas emissions. In an USA-Europe co-operation, researchers have analysed emerging climate strategies in the oil industry, the automobile industry, the chemical industry and the bank and insurance sector. These sectors are the most important players in the climate policy debate. Special attention has been paid to the questions whether strategies of EU based corporations differ systematically from USA based corporations. Results show rather sectorial specific developments. In most sectors, i.e. oil, automobile and banks, European corporations generally tend to have more advanced policies than their USA counterparts, but this does not apply to chemical companies. Corporate strategies appear to be highly determined by a combination of market situation in the home country and of access to alternative technologies. Objective of the study was to provide information of relevance to the COP (Sixth Session of the UNFCCC Conference of the Parties) 2000 conference, November 2000 in The Hague