Design and manufacture of a novel system to simulate the biomechanics of basic and pitching shoulder motion

Objectives: Cadaveric models of the shoulder evaluate discrete motion segments using the glenohumeral joint in isolation over a defined trajectory. The aim of this study was to design, manufacture and validate a robotic system to accurately create three-dimensional movement of the upper body and capture it using high-speed motion cameras. Methods: In particular, we intended to use the robotic system to simulate the normal throwing motion in an intact cadaver. The robotic system consists of a lower frame (to move the torso) and an upper frame (to move an arm) using seven actuators. The actuators accurately reproduced planned trajectories. The marker setup used for motion capture was able to determine the six degrees of freedom of all involved joints during the planned motion of the end effector. Results: The testing system demonstrated high precision and accuracy based on the expected versus observed displacements of individual axes. The maximum coefficient of variation for displacement of unloaded axes was less than 0.5% for all axes. The expected and observed actual displacements had a high level of correlation with coefficients of determination of 1.0 for all axes. Conclusions: Given that this system can accurately simulate and track simple and complex motion, there is a new opportunity to study kinematics of the shoulder under normal and pathological conditions in a cadaveric shoulder model

Design and manufacture of a novel system to simulate the biomechanics of basic and pitching shoulder motion

Objectives Cadaveric models of the shoulder evaluate discrete motion segments using the glenohumeral joint in isolation over a defined trajectory. The aim of this study was to design, manufacture and validate a robotic system to accurately create three-dimensional movement of the upper body and capture it using high-speed motion cameras. Methods In particular, we intended to use the robotic system to simulate the normal throwing motion in an intact cadaver. The robotic system consists of a lower frame (to move the torso) and an upper frame (to move an arm) using seven actuators. The actuators accurately reproduced planned trajectories. The marker setup used for motion capture was able to determine the six degrees of freedom of all involved joints during the planned motion of the end effector. Results The testing system demonstrated high precision and accuracy based on the expected versus observed displacements of individual axes. The maximum coefficient of variation for displacement of unloaded axes was less than 0.5% for all axes. The expected and observed actual displacements had a high level of correlation with coefficients of determination of 1.0 for all axes. Conclusions Given that this system can accurately simulate and track simple and complex motion, there is a new opportunity to study kinematics of the shoulder under normal and pathological conditions in a cadaveric shoulder model.</br

Voting for Direct Democracy: Evidence from a Unique Popular Initiative in Bavaria

We analyze a constitutional change in the German State of Bavaria where citizens, not politicians, granted themselves more say in politics at the local level through a constitutional initiative at the state level. This institutional setting allows us to focus on revealed preferences for direct democracy and to identify factors which explain this preference. Empirical results suggests support for direct democracy is rather related to dissatisfaction with representative democracy in general than with an elected governing party

Information vs Engagement in parliamentary websites – a case study of Brazil and the UK

Parliamentary websites have become the main window of parliament to the outside world. More than a gimmick, they are an essential element in the promotion of a relationship between parliament and citizens. This paper develops a comparative analysis of the websites of the lower chambers of the Brazilian and the British parliaments, respectively the Chamber of Deputies and the House of Commons. We structure this analysis around three dimensions: 1) information about the institution; 2) information about parliamentary activity; and 3) tools to promote engagement with the public. The choice of two very different case studies enables us to consider more clearly the specific purposes of these parliamentary websites. We consider in particular if these parliaments' institutional differences affect their websites. The websites' analysis is complemented by semi-structured elite interviews with parliamentary staff who manage the services provided by these websites. Our analysis shows that both websites achieve much higher levels of complexity in the information area than in engagement. But it also shows that the Brazilian parliament website includes far more tools designed for public interaction than its UK counterpart. The indexes and interviews show that both institutions are highly committed to disseminating data and information to citizens. This is seen as a path towards achieving higher accountability and improving knowledge about parliamentary processes and, consequently, improving public image and levels of trust. Whilst there is a strong focus on the provision of information, there is still little evidence of enabling citizen participation in the legislative process. This is partly due to a tension between conceptions of representative democracy and those of participatory democracy. The articulation between these different types of democracy still has a long way to be resolved, although parliaments are slowly introducing participatory tools

Deprivation of Liberty of Children

International children’s rights law is utterly clear. The use of deprivation of liberty of children must be limited to the absolute minimum. If it is nevertheless regarded necessary to arrest, detain, imprison, or institutionalize a child, states have the obligation to safeguard that her or his rights are recognized and adequately protected, regardless of the context in which the deprivation of liberty takes place. This chapter elaborates on the specifics of these two limbs of Article 37 CRC, the core human rights provision for the protection of children deprived of liberty. It analyzes the legal status these children are entitled to, specifies the corresponding negative and positive obligations for states, and explores avenues for an effective implementation.Effective Protection of Fundamental Rights in a pluralist worl

Themed issue: Party adaptation and change and the crisis of democracy: Essays in honour of Peter Mair

Ingrid van Biezen and Petr Kopeck, "The cartel party and the state: Party-state linkages in European democracies," 170-182. Richard S Katz, "No man can serve two masters: Party politicians, party members, citizens and principal agent models of democracy," 183-193. Zsolt Enyedi, "The discreet charm of political parties," 194-204. Ingrid van Biezen and Thomas Poguntke, "The decline of membership-based politics," 205-216. Cas Mudde, "Fighting the system? Populist radical right parties and party system change," 217-226. R Michael Alvarez, Ines Levin, Peter Mair, and Alexander Trechsel, "Party preferences in the digital age: The impact of voting advice applications," 227-236

The politics of Switzerland. Continuity and change in a consensus democracy

Despite Switzerland's small size, its political system is one of the most complex and fascinating among contemporary democracies. The rich, complex mixture of centuries-old institutions and the refined political arrangements that exist today constitute a veritable laboratory for social scientists and their students. Often presented as the paradigmatic case of political integration, consensus democracy and multinational federalism, the Swiss model has become a benchmark case for analyses in comparative politics, political behaviour and other related fields. Written by two leading experts on Swiss politics, this book presents a definitive overview for scholars and students interested in Switzerland's political system at the beginning of the twenty-first century. By focusing on its intricacies but also taking in larger issues of general interest, the broad scope of this study will appeal to all those interested in contemporary European politics and democratic systems

Responsive and Responsible? The role of Parties in Twenty_First Century politics

This special issue focuses on a particular aspect dear to theories of democracy in general and theories of representation in particular: the tension between responsiveness and responsibility affecting political parties in modern, liberal democracies. In doing so, it engages with Peter Mair's intellectual passion for this topic, which he developed over the years and intensively worked on until his premature death in 2011. He argued that this tension became ever more apparent, putting the very functioning and legitimacy of democratic government under great pressure. This contribution goes back in time, to the very beginning of the modern state, and argues that already the nascent parties and party systems were affected by the tension between responsiveness and responsibility. It then offers a synopsis, organised in a series of pictures' or frames' of the historical parcours along which this tension has impacted on the development of political parties. The article also presents and summarises the collective effort undertaken by a number of scholars, coming together to honour Peter Mair's work, to shed further theoretical and empirical light on this fundamental tension