During the coronavirus disease 2019 (COVID-19) pandemic, many countries opted for strict public health measures, including closing schools. After some time, they have started relaxing some of those restrictions. To avoid overwhelming health systems, predictions for the number of new COVID-19 cases need to be considered when choosing a school reopening strategy. Using a computer simulation based on a stochastic compartmental model that includes a heterogeneous and dynamic network, we analyse different strategies to reopen schools in the São Paulo Metropolitan Area, including one similar to the official reopening plan. Our model allows us to describe different types of relations between people, each type with a different infectiousness. Based on our simulations and model assumptions, our results indicate that reopening schools with all students at once has a big impact on the number of new COVID-19 cases, which could cause a collapse of the health system. On the other hand, our results also show that a controlled school reopening could possibly avoid the collapse of the health system, depending on how people follow sanitary measures. We estimate that postponing the schools' return date for after a vaccine becomes available may save tens of thousands of lives just in the São Paulo Metropolitan Area compared to a controlled reopening considering a worst-case scenario. We also discuss our model constraints and the uncertainty of its parameters.

The objective of this study was to develop new standardized alcohol-associated cues and assess their effects on brain activation with functional magnetic resonance imaging (fMRI). Pictures of alcoholic and neutral beverages and affectively neutral pictures were presented to 44 abstinent alcoholics and 37 age-matched healthy control subjects. We assessed the skin conductance response, and the elicited arousal and valence. Alcoholics and control subjects did not differ in arousal, valence or skin conductance response evoked by alcohol-associated and affectively neutral stimuli, while nonalcoholic beverages were rated as more unpleasant and arousing by alcoholics compared with control subjects. In the fMRI pilot study, alcohol and abstract pictures were presented to six abstinent alcoholics and induced a significant activation of brain areas associated with visual emotional processes such as the fusiform gyrus, parts of the brain reward system (basal ganglia and orbitofrontal gyrus) and further brain regions in the frontal and parietal cortices associated with the attention network. These observations suggest that standardized pictures of alcoholic beverages can be used to assess brain circuits involved in the processing and evaluation of alcohol cues.

Gaia DR2 was released in April 2018 and contains a photometric catalogue of more than 1 billion sources. This release contains colour information in the form of integrated BP and RP photometry in addition to the latest G-band photometry. The level of uncertainty can be as good as 2 mmag with some residual systematics at the 10 mmag level. The addition of colour information greatly enhances the value of the photometric data for the scientific community. A high level overview of the photometric processing, with a focus on the improvements with respect to Gaia DR1, was given. The definition of the Gaia photometric system, a crucial part of the calibration of the photometry, was also explained. Finally, some of the photometric improvements expected for the next data release were described.

The development of post-socialist cities has emerged as a major field of study among critical theorists from across the social sciences. Originally constructed under the dictates of central planners and designed to serve the demands of command economies, post-socialist urban centers currently develop at the nexus of varied and often competing economic, cultural, and political forces. Among these, nationalist aspirations, previously simmering beneath the official rhetoric of communist fraternity and veneer of architectural conformity, have emerged as dominant factors shaping the urban landscape. This article examines patterns, processes, and practices concerning the cultural politics of architecture, urban planning, and identity in the post-socialist city. In addition to assessing the main contours of this burgeoning field of research, this article highlights how this special issue of Nationalities Papers contributes to a broader understanding of contemporary cultural and political change in post-socialist urban settings.

Capital cities play an integral role in the construction of national identity. This is particularly true when the capital is the country's only major urban center. Over the course of its history, Mongolia's capital of Ulaanbaatar has been periodically reshaped to reflect competing trajectories of national culture. This article examines the evolving symbolism of architecture, urban design, and public space in Ulaanbaatar as a means of exploring Mongolia's complex negotiation between its traditional culture (mobile pastoralism and Shamanism/Buddhism), its socialist legacy, and globalization. Amidst the rampant social change of the last two decades, rather ambiguous national narratives have emerged in Mongolia. Like the capital's cityscape, these narratives reflect aspects of both recent and distant pasts, as well as contemporary economic, political, and social realities. This article reveals how increasingly palpable global economic and cultural practices are fomenting material change in the current phase of Ulaanbaatar's evolution. A combination of secondary source research and observations drawn from several months of fieldwork provide the basis for a discussion of the city's role as a forum for cultural contestation and national reform.

We study the quasifinear relaxation of an aperiodic instability, namely the instability caused by the temperature anisotropy of a collisionless electron plasma in the absence of an external magnetic field. We give a detailed description of the relaxation process and we examine the validity of the quasilinear theory (existence of separate time scales, quasilinearity of the particles' orbits).

PET studies using classical conditioning paradigms are reported. It is emphasized that PET studies show “cerebellar involvement” and not “specific function” in learning paradigms. The importance of dissociating motor performance and learning deficits in human lesions studies is demonstrated in two exemplary studies. The different role of the cerebellum in adaptation of postural reflexes and learning of complex voluntary arm movements is discussed, [THACH]