‘If you don’t have documents or a legal procedure, you are out!’ Making humanitarian organizations partner in migration control

The paradoxical merger of humanitarian care and securitization imperatives can be seen not only at external and externalized borders, but also at the internal borders in the Netherlands. Here, humanitarian organizations that sprang up to support migrants without a legal status in response to – and given their disagreement with – the state’s exclusionary migration policies have become involved in migration control. During a gradual and subtle responsibilization process, the Dutch authorities have used specific measures and redirected monetary flows in order to incorporate these organizations into its broader migration control policies. This has resulted in a decrease in the number of support organizations for unauthorized migrants, a reduction in their independence and autonomy, and an increased focus on selection and return. Ethnographic fieldwork amongst unauthorized migrants illustrates the consequences of this exclusionary control. These migrants experience exclusion, selection and enforcement by humanitarian organizations and doubt the trustworthiness of these organizations. This development seems to fit in with the broader trend of European states disarming humanitarian organizations for unauthorized migrants by either responsibilizing or criminalizing them. However, these strategies are not without consequences because they run the risk that unauthorized migrants will further withdraw and turn away from this type of assistance altogether. We use both a humanitarian and a pragmatic perspective to argue that it would make sense for states either to allow organizations to continue their – uncompromised and unconditional – support for unauthorized migrants or to adapt their migration policies in such a way that humanitarian support becomes redundant

Modulation of Thermoelectric Power of Individual Carbon Nanotubes

Thermoelectric power (TEP) of individual single walled carbon nanotubes (SWNTs) has been measured at mesoscopic scales using a microfabricated heater and thermometers. Gate electric field dependent TEP-modulation has been observed. The measured TEP of SWNTs is well correlated to the electrical conductance across the SWNT according to the Mott formula. At low temperatures, strong modulations of TEP were observed in the single electron conduction limit. In addition, semiconducting SWNTs exhibit large values of TEP due to the Schottky barriers at SWNT-metal junctions.Comment: to be published in Phys. Rev. Let

The pains of being unauthorized in the Netherlands

Ethnographic fieldwork amongst 105 unauthorized migrants in the Netherlands shows that unauthorized migrants suffer from the pains of being unauthorized. These migrants feel punished and are severely hurt by – amongst others – the deprivation of healthy and secure living conditions, social and geographical mobility and citizenship. These migrants’ pains are caused by current restrictive migration controls, something the Dutch authorities could and should be aware of given previous research that provides similar insights. While the Dutch authorities do provide – the legally required – provisions for unauthorized migrants, we argue on the basis of Hayes’ proximity model that these authorities accept the collateral consequences of (possibly) being subjected to migration controls and purposely inflict these pains on unauthorized migrants. This m

Magnon-driven quantum-dot heat engine

We investigate a heat- to charge-current converter consisting of a single-level quantum dot coupled to two ferromagnetic metals and one ferromagnetic insulator held at different temperatures. We demonstrate that this nano engine can act as an optimal heat to spin-polarized charge current converter in an antiparallel geometry, while it acts as a heat to pure spin current converter in the parallel case. We discuss the maximal output power of the device and its efficiency.Comment: 6 pages, 4 figures, published version, selected as Editor's choic

Thermoelectric effects in Kondo correlated quantum dots

In this Letter we study thermoelectric effects in ultra small quantum dots. We study the behaviour of the thermopower, Peltier coefficient and thermal conductance both in the sequencial tunneling regime and in the regime where Kondo correlations develope. Both cases of linear response and non-equilibrium induced by strong temperature gradients are considered. The thermopower is a very sensitive tool to detect Kondo correlations. It changes sign both as a function of temperature and temperature gradient. We also discuss violations of the Wiedemann-Franz law.Comment: 7 pages; 5 figure

Local Implicit Neural Representations for Multi-Sequence MRI Translation

In radiological practice, multi-sequence MRI is routinely acquired to characterize anatomy and tissue. However, due to the heterogeneity of imaging protocols and contra-indications to contrast agents, some MRI sequences, e.g. contrast-enhanced T1-weighted image (T1ce), may not be acquired. This creates difficulties for large-scale clinical studies for which heterogeneous datasets are aggregated. Modern deep learning techniques have demonstrated the capability of synthesizing missing sequences from existing sequences, through learning from an extensive multi-sequence MRI dataset. In this paper, we propose a novel MR image translation solution based on local implicit neural representations. We split the available MRI sequences into local patches and assign to each patch a local multi-layer perceptron (MLP) that represents a patch in the T1ce. The parameters of these local MLPs are generated by a hypernetwork based on image features. Experimental results and ablation studies on the BraTS challenge dataset showed that the local MLPs are critical for recovering fine image and tumor details, as they allow for local specialization that is highly important for accurate image translation. Compared to a classical pix2pix model, the proposed method demonstrated visual improvement and significantly improved quantitative scores (MSE 0.86 x 10^-3 vs. 1.02 x 10^-3 and SSIM 94.9 vs 94.3