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Search Results: 1 - 10 of 5303 matches for " Christoph Brinkmann "
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Automated Monitoring of the Establishment of the Adsorption Equilibrium: Adsorption of Polyethylene from 1,2,4-Trichlorobenzene onto a Zeolite at Temperature C
Tibor Macko,Robert Brüll,Christoph Brinkmann,Harald Pasch
Journal of Analytical Methods in Chemistry , 2009, DOI: 10.1155/2009/357026
Abstract: The automated procedure for the monitoring of the adsorption process in the solute-sorbent-solvent system has been elaborated. It uses commercially available instrument CRYSTAF model 200. The application of CRYSTAF enabled monitoring of adsorption of linear polyethylene with weight average molar masses of 2, 14, and 53 kg/mol from 1,2,4-trichlorobenzene onto zeolite SH-300 at temperature as high as 140°C. It is the authors' understanding that this is the first demonstration of an adsorption isotherms for polyethylene. The measurement with the CRYSTAF instrument reduces manual manipulations with dangerous solvents at high temperature and enables automated long-time monitoring of the concentration of the solute in an adsorption system.
TEMANEJO - a debugger for task based parallel programming models
Steffen Brinkmann,José Gracia,Christoph Niethammer,Rainer Keller
Computer Science , 2011,
Abstract: We present the program Temanejo, a debugger for task based parallelisation models such as StarSs. The challenge in debugging StarSs applications lies in the fact that tasks are scheduled at runtime, i.e dynamically in accordance to the data dependencies between them. Our tool assists the programmer in the debugging process by visualising the task dependency graph and allowing to control the scheduling of tasks. The toolset consists of the library Ayudame which communicates with the StarSs runtime on one side and of the debugger Temanejo on the other side which communicates with Ayudame. Temanejo provides a graphical user interface with which the application can be analysed and controlled.
Ramsey numbers R(K3,G) for graphs of order 10
Gunnar Brinkmann,Jan Goedgebeur,Jan-Christoph Schlage-Puchta
Computer Science , 2012,
Abstract: In this article we give the generalized triangle Ramsey numbers R(K3,G) of 12 005 158 of the 12 005 168 graphs of order 10. There are 10 graphs remaining for which we could not determine the Ramsey number. Most likely these graphs need approaches focusing on each individual graph in order to determine their triangle Ramsey number. The results were obtained by combining new computational and theoretical results. We also describe an optimized algorithm for the generation of all maximal triangle-free graphs and triangle Ramsey graphs. All Ramsey numbers up to 30 were computed by our implementation of this algorithm. We also prove some theoretical results that are applied to determine several triangle Ramsey numbers larger than 30. As not only the number of graphs is increasing very fast, but also the difficulty to determine Ramsey numbers, we consider it very likely that the table of all triangle Ramsey numbers for graphs of order 10 is the last complete table that can possibly be determined for a very long time.
How to Raise Teachers’ Motivation through “Nudges” and Attribution Theory  [PDF]
Kevin Brinkmann
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.511002
Teachers’ motivation correlates positively with better teaching practices, higher student motivation, and better overall well-being. This case study reflects on an innovative approach being used to raise teachers’ motivation in India. The approach combines Nudge Theory (from the discipline of Political Science) and Attribution Theory (from the discipline of Psychology) into a comprehensive strategy that has the potential to change teachers’ long-term motivation, by changing their sense of identity.
Why 16 Million Bonded Labourers Remain Invisible: What Althusser Has to Say  [PDF]
Kevin Brinkmann
Advances in Applied Sociology (AASoci) , 2018, DOI: 10.4236/aasoci.2018.81003
Abstract: Seventy years after the UN Declaration of Human Rights, sixteen million bonded labours remain largely unnoticed in South Asia. Why? The most fundamental reason may not lie within economics or politics but in ideology.
Hybrid MPI/StarSs - a case study
Jose Gracia,Christoph Niethammer,Manuel Hasert,Steffen Brinkmann,Rainer Keller,Colin W. Glass
Computer Science , 2012,
Abstract: Hybrid parallel programming models combining distributed and shared memory paradigms are well established in high-performance computing. The classical prototype of hybrid programming in HPC is MPI/OpenMP, but many other combinations are being investigated. Recently, the data-dependency driven, task parallel model for shared memory parallelisation named StarSs has been suggested for usage in combination with MPI. In this paper we apply hybrid MPI/StarSs to a Lattice-Boltzmann code. In particular, we present the hybrid programming model, the benefits we expect, the challenges in porting, and finally a comparison of the performance of MPI/StarSs hybrid, MPI/OpenMP hybrid and the original MPI-only versions of the same code.
Combined esophageal injury complicated by progression to a second perforation: a case report
Andreas Krieg, Christoph Vogt, Uwe Ramp, Ludger W Poll, Martin J Brinkmann, Edwin B?lke, Wolfram T Knoefel, Matthias Peiper
Journal of Medical Case Reports , 2009, DOI: 10.4076/1752-1947-3-9213
Abstract: We report the case of a combined esophageal perforation and dissection in a 45-year-old Caucasian woman with a history of relapsing periods of dysphagia since her childhood. The clinical course in this patient was complicated by progression to a second perforation, which made a definitive surgical management by esophagectomy necessary.To the best of our knowledge, this is the first reported case of a combined esophageal perforation and dissection complicated by progression to a second perforation. This emphasizes that cautious and intensive observation is necessary in patients with esophageal dissection.According to their extent, esophageal injuries are classified into (i) transmural, short and predominantly distally localized perforations, (ii) mucosal, short lesions in the distal esophagus, and (iii) intramural dissections [1]-[3]. Intramural esophageal dissection is a rare disorder characterized by the appearance of a false lumen between the esophageal mucosa and submucosa separated by a mucosal septum. Predominantly, the dissection occurs in women in their seventies and eighties [1]. Symptoms such as sudden retrosternal pain, hematemesis and odynophagia have been described [4]. The pathogenesis is as yet unknown but it has been postulated that submucosal bleeding, which secondarily perforates the mucosa and by this decompresses the intramural hematoma or a primarily existing mucosal tear with secondary submucosal dissection might be an explanation for the development of a transmural dissection [4]. Diagnostic procedures involve an esophagogram with contrast, endoscopy or computed tomography (CT) [5].Here we report a very rare case of transmural esophageal dissection with complete transmural perforation after endoscopic recovery of an impacted pearl onion (typically less than 25 mm in diameter and also known as silver or cocktail onions) in a patient suffering from chronic dysphagia since her childhood. To the best of our knowledge, this is the first reported cas
Qualitative research between craftsmanship and McDonaldization. A keynote address from the 17th Qualitative Health Research Conference
Svend Brinkmann
Qualitative Studies , 2012,
Abstract: Although qualitative research methods remain marginalized in certain disciplines, qualitative inquiry has within the last couple of decades become generally accepted as a legitimate scientific way of working. Today, society at large is making more use of qualitative research than ever, not just in laudable social justice research, for example, but also in relation to market and consumer research and focus groups for different political parties. With this in mind, I wish to discuss three current questions for qualitative researchers: The first I will refer to as “ethical progressivism versus new ethical challenges”. Is qualitative research as such more ethical and progressive than quantitative research (as some have argued), or do qualitative researchers on the contrary face more elusive and perhaps difficult ethical challenges? The second question is called “solid evidence versus subjective anecdotes”. How should qualitative researchers respond to the current call for evidence? Should they seek legitimacy by accepting the dominant politics of evidence, or should they play by their own rules with the risk of increasing marginalization? The third question is “method versus intuition”. Should qualitative researchers strive for maximum transparency by following accepted methods, or should they proceed more intuitively like artists to create their stories? Both sides of the questions have their influential advocates today. I will argue that all three questions are handled most fruitfully by conceiving of qualitative research as a craft.
Detecting automorphic orbits in free groups
Peter Brinkmann
Mathematics , 2008, DOI: 10.1016/j.jalgebra.2010.05.032
Abstract: We present an effective algorithm for detecting automorphic orbits in free groups, as well as a number of algorithmic improvements of train tracks for free group automorphisms.
Splittings of mapping tori of free group automorphisms
Peter Brinkmann
Mathematics , 2001,
Abstract: We present necessary and sufficient conditions for the existence of a splitting over $\mathbb{Z}$ of the mapping torus $M_\phi=F\rtimes \mathbb{Z}$ of a free group automorphism $\phi$.
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