Migration, Seafarers and the Humanitarian-Security-Economic Regimes Complex at Sea

Undocumented migration across the maritime space poses different challenges to the maritime industry. By focusing on a hitherto overlooked group, seafarers, the chapter attempts to set their experiences in the maritime security research agenda by using the Mediterranean scene as a demonstrative case study. The chapter highlights the normative dilemma and conceptual limitation of reading undocumented migration at sea through a security lens alone. Instead, by focusing on the experiences of seafarers in relation to migrants at sea, the chapter draws from the literature on international regime complexity to frame the socio-legal, political and economic environment seafarers inhabit and operate in vis-à-vis migrants as a ‘humanitarian-security-economic regimes complex’. Using examples from the Mediterranean Sea, the chapter argues that the humanitarian, security and economic regimes within the complex place contradicting expectations on seafarers which entail significant tensions and lead to trade-offs such as instances of non-rescue. The chapter, thus, calls for more research into the experiences of seafarers which takes into account the nuances of the humanitarian, security and economic challenges they face when encountering migrants at sea

Between the legacy of nation-state and forces of globalisation : Turkey’s management of mixed migration flows

Turkey, at the crossroads of Europe, Middle East and Asia, has confronted with mounting pressures of mixed migration flows in recent decades. This paper aims to explore Turkey’s contemporary approach to migration management by focusing on the adoption of the country’s first comprehensive immigration law (Law on Foreigners and International Protection) and the signing of the readmission agreement with the European Union in 2013. This incorporates an analysis of both policy continuities and changes in migration management in Turkey, while also providing an understanding of the interplay between internal and external factors, namely internationalisation and Europeanisation processes and the responsiveness of domestic actors to such pressures. The paper argues that migration policies driven solely by state-centric concerns are becoming increasingly inefficient in responding to the challenges caused by interlinked pressures of globalisation and multi-layered migratory flows. As Turkey’s role as a transit and receiving country grows, issues of international migration, and irregular migration in particular, are becoming dynamic topics in defining its role in a globalised world and as well as the trajectory of its relations with the EU

Impact of laminar flow velocity of different acids on enamel calcium loss

OBJECTIVE: The aim of the study was to evaluate the impact of flow velocity under laminar flow conditions of different acidic solutions on enamel erosion. MATERIAL AND METHODS: A total of 240 bovine enamel specimens were prepared and allocated to 30 groups (n = 8 each). Samples of 18 groups were superfused in a flow chamber system with laminar flow behavior using 1 ml of citric acid or hydrochloric acid (HCl) of pH 2.0, 2.6 or 3.0. Flow rates in the sample chamber were adjusted to 10, 60 or 100 μl/min. To simulate turbulent flow behavior, samples of six groups were immersed in 1 ml of the respective solution, which was vortexed (15 min, 600 rpm). For simulating non-agitated conditions, specimens of the remaining six groups were immersed in 1 ml of the respective solution without stirring. Calcium in the solutions, released from the enamel samples, was determined using Arsenazo III method. RESULTS: For acidic solutions of pH 2.6 and 3.0, erosive potential of citric acid was equivalent to that of HCl at a flow of 100 μl/min. The same observation was made for the samples subjected to turbulent conditions at pH 3. At all other conditions, citric acid induced a significantly higher calcium loss than HCl. CONCLUSION: It is concluded that under slow laminar flow conditions, flow rate variations lead to higher erosive impact of citric acid compared to hydrochloric acid at pH 2.0, but not at pH ≥ 2.6 and increasing laminar flow or turbulent conditions. CLINICAL RELEVANCE: Erosive enamel dissolution under laminar flow conditions is a complex issue influenced by flow rate and acidic substrate