Drude in D major

We study holographic momentum relaxation in the limit of a large number of spacetime dimensions D. For an axion model we find that momentum conservation is restored as D becomes large. To compensate we scale the strength of the sources with D so that momentum is relaxed even at infinite D. We analytically obtain the quasi-normal modes which control electric and heat transport, and give their frequencies in a 1/D expansion. We also obtain the AC thermal conductivity as an expansion in 1/D, which at leading order takes Drude form. To order 1/D our analytical result provides a reasonable approximation to the AC conductivity even at D=4, establishing large D as a practical method in this context. As a further application, we discuss the signature of the transition from coherent to incoherent behaviour known to exist in the system for finite D.Comment: 19 pages, 2 figure

Choosing secondary school by moving house: school quality and the formation of neighbourhoods

This paper uses the pupil census in England to explore how family house moves contribute to school and residential segregation. We track the moves of a single cohort as it approaches the secondary school admission age. We also combine a number of cohorts and estimate a dynamic nonlinear model for house moving with unobserved effects. These approaches yield the same result: moving is significantly negatively correlated with school quality, and segregation does increase as a cohort reaches age 11. However, this relationship is weak: the increase in segregation is slight and quantitative significance of the estimated relationship is low.school quality, moving, segregation, neighbourhoods

Hand Keypoint Detection in Single Images using Multiview Bootstrapping

We present an approach that uses a multi-camera system to train fine-grained detectors for keypoints that are prone to occlusion, such as the joints of a hand. We call this procedure multiview bootstrapping: first, an initial keypoint detector is used to produce noisy labels in multiple views of the hand. The noisy detections are then triangulated in 3D using multiview geometry or marked as outliers. Finally, the reprojected triangulations are used as new labeled training data to improve the detector. We repeat this process, generating more labeled data in each iteration. We derive a result analytically relating the minimum number of views to achieve target true and false positive rates for a given detector. The method is used to train a hand keypoint detector for single images. The resulting keypoint detector runs in realtime on RGB images and has accuracy comparable to methods that use depth sensors. The single view detector, triangulated over multiple views, enables 3D markerless hand motion capture with complex object interactions.Comment: CVPR 201

Journey of Jonathan Livingston: Process of creating an original composition and a musical narrative based on a written story

This paper is a reflection of a Culminating Experience created for a specific learning outcome as provided by Scoring for Film, TV and Video Games master program. In this experience an author was set with a task to create an original piece of music based on a visual media, script or any other available source material, that could serve as an inspiration for writing music. Once selected, an author was tasked to compose and orchestrate an original composition, to be recorded at Air Studios located in London, with a 51 piece orchestra, and mix and master the recording to its final release form. The complexity of the task is a test of the skills acquired through the academic year, which in theory a composer for the media should posses and be familiar with. The ability to take the process from the very first initial stage and successfully finalise the piece of music up to a high standard is a crucial test for any aspiring professional. Even more so if the composer is dealing with a great standard of expectations at such professional environment as was provided and expected by Air Studios. In this document an author will take the reader through all the major stages of a production, as part of which he’ll explain the process and reflect on the challenges that might have occurred. Lastly, an author will reflect on the overall outcome of the project and provide an evaluation of the achievements as well as failures.https://remix.berklee.edu/graduate-studies-scoring/1140/thumbnail.jp

Reviewing the effects of food provisioning on wildlife immunity

While urban expansion increasingly encroaches on natural habitats, many wildlife species capitalize on anthropogenic food resources, which have the potential to both positively and negatively influence their responses to infection. Here we examine how food availability and key nutrients have been reported to shape innate and adaptive immunity in wildlife by drawing from field-based studies, as well as captive and food restriction studies with wildlife species. Examples of food provisioning and key nutrients enhancing immune function were seen across the three study type distinctions, as were cases of trace metals and pharmaceuticals impairing the immunity of wildlife species. More generally, food provisioning in field studies tended to increase innate and adaptive responses to certain immune challenges, whereas patterns were less clear in captive studies. Mild food restriction often enhanced, whereas severe food restriction frequently impaired immunity. However, to enable stronger conclusions we stress a need for further research, especially field studies, and highlight the importance of integrating nutritional manipulation, immune challenge, and functional outcomes. Despite current gaps in research on this topic, modern high throughput molecular approaches are increasingly feasible for wildlife studies and offer great opportunities to better understand human influences on wildlife health.This article is part of the theme issue 'Anthropogenic resource subsidies and host-parasite dynamics in wildlife'

The Formation of School Peer Groups: Pupils’ Transition from Primary to Secondary School in England

This paper examines the transitions from primary to secondary school for a contemporary cohort of children moving between state schools in England. It uses data on over 12,000 primary schools, over 2000 secondary schools and around 400,000 pupils. The results suggest that the experiences of poor (FSM) pupils at age 11 may be quite different, on average, to their non-poor peers. Poor pupils’ primary peer groups are more fractured at the age of 11 and these pupils tend to find themselves more concentrated within lower performing secondary schools. High ability pupils are more likely to go to the modal secondary school if it is better than average; the reverse is true for low ability pupils. Poor pupils are less likely to go to the modal school when it is better than average but more likely to go when it is worse. Finally, we find that primary schools which have high academic test scores have more bifurcated flows: poor and non-poor pupils are dispersed across different secondary schools, with the former more likely to attend a low performing secondary school.Primary to secondary school transitions; England; regression and graphical analysis