Contesting neoliberalism in an ‘activist city’: working towards the urban commons in Berlin

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Micro protocol engineering for unstructured carriers: On the embedding of steganographic control protocols into audio transmissions

Network steganography conceals the transfer of sensitive information within unobtrusive data in computer networks. So-called micro protocols are communication protocols placed within the payload of a network steganographic transfer. They enrich this transfer with features such as reliability, dynamic overlay routing, or performance optimization --- just to mention a few. We present different design approaches for the embedding of hidden channels with micro protocols in digitized audio signals under consideration of different requirements. On the basis of experimental results, our design approaches are compared, and introduced into a protocol engineering approach for micro protocols.Comment: 20 pages, 7 figures, 4 table

Atomic layer deposition on porous powders with in situ gravimetric monitoring in a modular fixed bed reactor setup

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Review of Scientific Instruments 88, 074102 (2017) and may be found at https://doi.org/10.1063/1.4992023.A modular setup for Atomic Layer Deposition (ALD) on high-surface powder substrates in fixed bed reactors with a gravimetric in situ monitoring was developed. The design and operation are described in detail. An integrated magnetically suspended balance records mass changes during ALD. The highly versatile setup consists of three modular main units: a dosing unit, a reactor unit, and a downstream unit. The reactor unit includes the balance, a large fixed bed reactor, and a quartz crystal microbalance. The dosing unit is equipped with a complex manifold to deliver gases and gaseous reagents including three different ALD precursors, five oxidizing or reducing agents, and two purge gas lines. The system employs reactor temperatures and pressures in the range of 25-600 °C and 10−3 to 1 bar, respectively. Typically, powder batches between 100 mg and 50 g can be coated. The capabilities of the setup are demonstrated by coating mesoporous SiO2 powder with a thin AlOx (submono) layer using three cycles with trimethylaluminium and H2O. The self-limiting nature of the deposition has been verified with the in situ gravimetric monitoring and full saturation curves are presented. The process parameters were used for a scale-up in a large fixed bed reactor. The samples were analyzed with established analytics such as X-ray diffraction, N2 adsorption, transmission electron microscopy, and inductively coupled plasma optical emission spectrometry.DFG, 53182490, EXC 314: Unifying Concepts in Catalysi

Global History 2008–2010:: Empirische Erträge, konzeptionelle Debatten, neue Synthesen

Global History 2008–2010: Empirical results, conceptual debates and new synthesis Since the late 1980s world and global history is on its current road to success within the discipline of history and has thus invited for comments, which have been made from different angles. This article continues these accompanying, reflective voiced by both limiting itself and enlarging the perspective. It is confined narrowly since it focuses on the developments of the last three years while it simultaneously takes into consideration a broader spectre of publication compared to other review articles. At its centre is the observation of a double trend: on the one hand a revival of large syntheses takes place, reflecting the interest of a wider audience global interpretation of the past as a preliminary to understand the present (and these including publications designed for teaching at the Bachelor and Master level); on the other hand in terms of research an “empirical turn” has asserted itself, more and more world and global history is published in specialized monographs. Added to that the article notices an increasing number of workshops, multilateral research groups and academic journals with an internationally composed authorship, which reminds that world and global history today is evolving as a transnational practice and in doing so is forerunner in the future course of the academic historiography and neighbouring discipline