Hexavalent chromium (Cr6+) is a toxic carcinogenic pollutant that might be released by the mining and processing of ultramafic rocks and nickel laterites and which requires permanent removal from the contaminated biosphere. Ultramafic material can also serve as a feedstock for the sequestration of CO2 resulting from the growth of new minerals, raising the intriguing proposition of integrated sequestration of both pollutants, CO2 and chromium, into magnesium carbonates. Such a synergistic process downstream of ore recovery and mineral processing could be an elegant proposition for more sustainable utilisation and management of the Earth's resources. We have therefore carried out an experimental and microanalytical study to investigate potentially suitable carbonate minerals. Uptake of chromium in carbonate phases was determined, followed by identification of the crystalline phases and characterisation of the local structural environment around the incorporated chromium centres. The results suggest that neither nesquehonite nor hydromagnesite have the structural capacity to incorporate Cr6+ or Cr3+ significantly at room temperature. We therefore propose that further research into this technology should focus on laboratory assessments of other phases, such as layered double hyroxides, that have a natural structural capacity to uptake both chromium and CO2.

The German Federal Constitutional Court’s ruling of May 5, 2020 on the ECB’s Public Sector Purchase Programme (PSPP) stated, for the first time ever, that some decisions by European institutions are not covered by the competence allocations of the European Treaties and cannot therefore take effect in Germany. This article argues that the judgment came as no surprise, as it is consistent with the principle of conferral of powers. According to this principle the EU and its institutions can only act within the limits of their competences. The German Basic Law prohibits any transfer of sovereign rights whose exercise would confer sua sponte additional competences to the supranational level. Against this background, the Federal Constitutional Court judgment does not seek to limit the ECB’s scope for appraisal and evaluation in the exercise of its monetary policy mandate. It focuses rather on the conditions which legitimize the ECB’s leeway. The issue in this case is not the applicability of the proportionality principle as a criterion governing the delimitation of powers, but the different reference points for the assessment of proportionality. In this regard the CJEU had failed to discuss whether monetary policy and the effects on economic policy are proportionate by themselves. Hence, in constitutional terms, the CJEU’s interpretation was found to be “arbitrary”, since the German Constitutional Court defined arbitrariness as jurisprudence that “in a reasonable reading … [appears] unintelligible and clearly untenable.” In other words, it is “simply not comprehensible.” Despite the harsh words of the German Constitutional Court, the authors argue that the judgement in the end can help to create a European legal culture that will strengthen the European Union in the long term if, in future, the CJEU engages more constructively with criticisms from Member State courts.

Under the Nazi regime, tens of thousands of Jews lived in ghettos, working more or less normal jobs. Some of these ghettos had their own employment centers, and some employers even paid into retirements funds. Legislation known as “German Pensions for Work in Ghettos,” or by its German acronym, ZRBG (Gesetz zur Zahlbarmachung von Renten aus Beschäftigungen in einem Ghetto) was passed in 2002 to grant pensions to some of these former laborers. But more than ten years after its passage, its implementation is still subject to considerable conflict. For many years, former laborers in Nazi ghettos have been fighting to get the pension that this law ostensibly guarantees them, but the vast majority of their applications have been rejected. Since 2002, around 70,000 survivors have invoked the ZRBG. However, over ninety percent of these applications were initially rejected by German authorities for various legal and practical reasons. This essay is an attempt to summarize the major steps in the implementation of the law. It begins with an overview of the historical background, and then will shift focus to the judicial, diplomatic, political, and practical problems with the implementation of the ZRBG.

By its first request for a preliminary ruling, the German Constitutional Court aired its doubts about the lawfulness of the Outright Monetary Transactions (OMTs) program. In this article it is argued that the ECB's pledge in the summer of 2012 to do “whatever it takes” to safeguard the monetary policy transmission mechanism in all countries of the euro area by buying government bonds was generally compatible with EU law. However, it is argued that there is some potential for the ECB to infringe the Treaty on the Functioning of the European Union (TFEU) while acting according to this announcement. The peculiarity of the situation, the author argues, is that we might be dealing with a “self-fulfilling prophecy” in that the ECB announces a particular policy, which might not be compatible with EU law, but the act announced, will never take place because the political problem would have been resolved by the measure previously announced. The critical question in this scenario refers to how a court should react to such a situation. The author argues that a court in such a situation has to show the legal limits of the particular institution, but neither the ECJ nor the German Constitutional Court may replace the central banks' task to maintain financial stability. Finally, a comment is given on how the German Constitutional Court will react to the ECJ's decision in that case.

Case C-160/09 Ioannis Katsivardas – Nikolaos Tsitsikas OE v. Ipourgos Ikonomikon

Article 4 of the Cooperation Agreement concluded between the European Economic Community, of the one part, and the Cartagena Agreement and the member countries thereof – Bolivia, Colombia, Ecuador, Peru and Venezuela – of the other part, approved by Council Regulation (EEC) No 1591/84 of 4 June 1984, is not such as to confer on individuals rights upon which they might rely before the courts of a Member State (official headnote).

In boundary-layer flows, one may reduce skin-friction drag by delaying the onset of laminar-to-turbulent transition via the attenuation of small-amplitude Tollmien–Schlichting (TS) waves. In this work, we use numerical simulations and experiments to compare the robustness of adaptive and model-based techniques for reducing the growth of two-dimensional TS disturbances. In numerical simulations, the optimal linear quadratic Gaussian (LQG) regulator shows the best performance under the conditions it was designed for. However, it is found that the performance deteriorates linearly with the drift of the Reynolds number from its nominal value. As a result, an order-of-magnitude loss of performance is observed when applying the computation-based LQG controller in wind-tunnel experiments. In contrast, it is shown that the adaptive filtered-X least-mean-squares (FXLMS) algorithm is able to maintain an essentially constant performance for significant deviations of the nominal values of the disturbance amplitude and Reynolds number.