168 research outputs found
Plasma immersion ion implantation of cold work steel
No full textPlasma immersion ion implantation of cold work steel / G. Thorwarth, S. Mändl, B. Rauschenbach. – In: Surface and coatings technology. 125. 2000. S. 94-9
The micro-politics of remembering “the 1994 genocide against the Tutsi” in Rwanda
No full textThis chapter complicates many of the assumed benefits of commemorative sites in post-conflict contexts by analysing people’s perceptions of spiritual violence associated with state-funded genocide memorials in Rwanda. Genocide survivors have collaborated in the creation of these sites to remember loved ones who were murdered during the “1994 genocide against the Tutsi”, as it is referenced in official discourse. However, these sites have been increasingly politicised by the government’s efforts to provide irrefutable evidence of the genocide, central to which is the amassing of anonymous human remains of alleged victims. Based on qualitative research conducted among memorial staff, survivors, bystanders, and other conflict-affected Rwandans since 2007, this chapter suggests that the politicisation of the anonymous dead has transformed these sites into sources of political tension and spiritual violence that can have negative mental and physical health consequences. It explores these tensions as they pertain to memorials in Karongi district in western Rwanda. This region, which endured not only the 1994 genocide, but was also hard hit by related mass atrocities throughout the 1990s, is especially relevant for revealing the potential challenges of commemoration in authoritarian contexts where state interests take precedence over the needs of survivors and other conflict-affected cohorts
Disorder formation in rutile during ion assisted deposition
No full textDisorder formation in rutile during ion assisted deposition / B. Stritzker, B, Rauschenbach. – In: Surface & coatings technology. 196. 2005. S. 76-8
Plasma immersion ion implantation using titanium and oxygen ions
No full textPlasma immersion ion implantation using Titanium and oxygen ions / G. Thorwarth, S. Mändl, B. Rauschenbach. – In: Surface and coatings technology. 128/129. 2000. S. 116-12
Textured titanium oxide thin films produced by vacuum arc deposition
No full textTextured Titanium oxide thin films produced by vacuum arc deposition / S. Mändl, G. Thorwarth, B. Rauschenbach. – In: Surface and coatings technology. 133/134. 2000. S. 283-28
Preparative mass spectrometry instrumentation for large native protein deposition
No full textElectrospray-ion-beam deposition (ES-IBD) is a preparative mass spectrometry technique which produces highly purified samples of non-volatile molecules adsorbed on a surface. An ES-IBD mass spectrometer (MS) ionises the analyte, transfers it into the gas phase, removes contaminations with a mass filter in vacuum and deposits it with a controlled landing energy onto a substrate. ES-IBD coupled to microscopy can elucidate the structure of biomolecules and their assemblies. In conjunction with scanning tunnelling microscopy, glycan connectivity of oligosaccharides was revealed. For larger molecules, such as native protein complexes, efforts are underway to determine their structure and conformation by coupling ES-IBD to cryo-electron microscopy or low-energy electron holography. However, there are no instruments available dedicated to depositing large, native protein complexes controlled and efficiently. In this thesis, I have modified a commercial MS designed for the analysis of large, native protein complexes (Thermo ScientificTM Q ExactiveTM UHMR) for deposition. The modified instrument has adequate beam intensity and good landing energy control. In conjunction with electron microscopy, it was shown that the native shape of protein assemblies is retained after dehydration and deposition. I used an enzymatic assay to quantify the activity of the non-covalent protein complex alcohol dehydrogenase after deposition on a dry surface. Moreover, I developed another instrument for mass- and mobility-filtered deposition of both small and large molecules. Its atmosphere-pressure interface, the ion funnel, is optimised for high transmission and it has a continuous parallel flow ion mobility filter to enable conformation-selected deposition. Radio-frequency power switches with a flexible operation frequency permit to transmit any ion with a mass-to-charge range > 50 Th, in particular heavy ions. The basis for the development of the second MS was the detailed investigation of the transport processes within an ion funnel. I formulate a 4-step ion funnel transmission model underpinned by transmission measurements of a conventional ion funnel and ion trajectory simulations taking into account the gas flow field
Localising memory in transitional justice. The dynamics and informal practices of memorialisation after mass violence and dictatorship
No full textThis collection adds to the critical transitional justice scholarship that calls for “transitional justice from below” and that makes visible the complex and oftentimes troubled entanglements between justice endeavours, locality, and memory-making. Broadening this perspective, it explores informal memory practices across various contexts with a focus on their individual and collective dynamics and their intersections, reaching also beyond a conceptualisation of memory as mere symbolic reparation and politics of memory.It seeks to highlight the hidden, unwritten, and multifaceted in today’s memory boom by focusing on the memorialisation practices of communities, activists, families, and survivors. Organising its analytical focal point around the localisation of memory, it offers valuable and new insights on how and under what conditions localised memory practices may contribute to recognition and social transformation, as well as how they may at best be inclusive, or exclusive, of dynamic and diverse memories.Drawing on inter- and multi-disciplinary approaches, this book brings an in-depth and nuanced understanding of local memory practices and the dynamics attached to these in transitional justice contexts. It will be of much interest to students and scholars of memory and genocide studies, peace and conflict studies, transitional justice, sociology, and anthropology
Growth, genes, genomes: iInsights into microbial respiration of arsenic and selenium
No full textArsenic (As) and selenium (Se) are naturally occurring metalloids in the Earth’s crust. Their speciation is governed by the microbial communities in various environments which influences their mobility among the soil, water, and air interface. Microorganisms can utilize As and Se oxyanion as terminal electron acceptors in dissimilatory reduction. These organisms are ubiquitous and phylogenetically diverse. The objectives of the studies in this thesis were to gain an understanding of the metabolism of As and Se respiring bacteria, analyze the genes encoding enzymes involved in respiration and understand how these enzymes are regulated in the presence of various electron acceptors. We were able to isolate two novel As and Se respiring bacteria from different environments; from a wastewater treatment facility in Verona, NJ and an estuarine canal from Chennai, India. Based on 16S rRNA gene analysis, strain S4 was classified as a novel genus and species, Selenovibrio woodruffi and strain S5 as a novel species, Desulfurispirillum indicum. We analyzed the genome of D. indicum and examined the expression of putative reductases to further understand respiratory metabolism of As and Se oxyanions. Five molybdoenzyme genes were identified in the genome of strain S5, three of which we were annotated to encode for a respiratory arsenate reductase arr, periplasmic nitrate reductase nar, and respiratory nitrate reductase nap. Also, an arsenate resistance system, ars, was identified. We were not able to positively identify a selenate reductase gene. Gene expression studies revealed that arr was an inducible gene and the only gene highly expressed during arsenate respiration. Growth studies showed that selenate respiration was inhibited by nitrate. Lastly, we also enriched activated sludge samples for tellurium oxyanion respiring bacteria. Thus, we not only added novel, phylogenetically different organisms to the ever-increasing list of As and Se respiring microbes, we also provided insights into the genes and enzymes involved in As and Se respiration and how they are regulated.Ph. D.Includes bibliographical referencesby Ines Rauschenbac
Plasma immersion ion implantation of cold work steel
No full textPlasma immersion ion implantation of cold work steel / G. Thorwarth, S. Mändl, B. Rauschenbach. – In: Surface and coatings technology. 125. 2000. S. 94-9
Plasma immersion ion implantation using Titanium and oxygen ions
No full textPlasma immersion ion implantation using Titanium and oxygen ions / G. Thorwarth, S. Mändl, B. Rauschenbach. – In: Surface and coatings technology. 128/129. 2000. S. 116-12
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