Since the 2010s, social scientists have increasingly conducted survey-experimental studies that explore what factors drive public attitudes towards migrants in host countries. We conducted a systematic meta-analysis of 118 such studies, comprising 428,881 respondents from fifty-three countries. We find that sociotropic economic concerns play a key role, with individuals being more welcoming towards migrants who contribute to the economy through their professional occupation, education, or language skills. In contrast, there is limited evidence that hosts evaluate migrants based on egocentric economic concerns. Cultural concerns are also important; notably, we uncover a persistent anti-Muslim bias. Humanitarian concerns shape attitudes as well – especially towards forcibly displaced migrants, who are generally viewed more favorably than economic migrants. Climate migrants place between conflict migrants and economic migrants in terms of public perception. Our meta-analysis raises several questions that remain unanswered in the literature, suggesting important directions for future research.

This article provides a global ranking of research productivity of political science departments. We collected data on 115,427 articles and 12,696 books—written in both English and other languages—from 5,586 faculty members in 178 departments in North America, Europe, Asia, Latin America, Oceania, and Africa. Departments are ranked in terms of citations to articles published by faculty members, impact factors of journals in which they published, and number of top publications in which they published. Results are presented for overall and more recent research productivity.

The development of thermal boundary layers and plume near a section-triangular roof under different isothermal heating conditions has been the focus of numerous numerical studies. However, flow transition in this type of flow has never been observed experimentally. Here, phase-shifting interferometry and thermistor measurements are employed to experimentally observe and quantify the flow transitions in a buoyancy-driven flow over an isothermal section-triangular roof. Visualisation of temperature contours is conducted across a wide range of Rayleigh numbers from laminar at 103 to chaotic state at 4 × 106. Power spectral density of the temperature measurements reveals the type of bifurcations developing as the Rayleigh number is increased. This flow transition is characterised as a complex bifurcation route with the presence of two fundamental frequencies, a low and a high frequency. We found that the thermal stratification in the environment plays a significant role in the flow transition. The spatial development of flow is also quantitatively and qualitatively described. In addition to clarifying flow transition in experiments, the work demonstrates the implementation of phase-shifting interferometry and punctual temperature measurements for characterisation of near-field flow over a heated surface.

Political parties face a crucial trade-off between electoral and partisan goals: should they put electoral goals first, pursuing the policies they think will win them the most votes in the next election, or should they put partisan goals first, pursuing the policies their members, activists, and most loyal voters prefer? In this paper we argue that main political parties make different choices depending on the information environment they are in. They have strong incentives to follow the median voter when the median voter's position is well known, but when there is more uncertainty they have strong incentives to adopt policies they prefer for partisan reasons, since uncertainty makes party leaders more willing to bet that the party's preferred policies are also vote winners. We develop an empirical analysis of how the main parties on the left and the right in twenty democracies have changed their platforms from election to election since the 1960s.