364 research outputs found
Long-range ordering of turbulent stresses in 2D turbulence
No full textWe use filter-space techniques to study the geometric alignment of turbulent stresses and strain rates in an experimental quasi-two-dimensional weakly turbulent flow. When these stresses and strains are misaligned, the usual turbulent energy cascade can be suppressed; and more generally, the relative alignment of these two tensors determines the direction of the cascade. We show that as a function of length scale, the turbulent stress undergoes a transition to system-spanning order. However, by exploring analogously defined quantities in a field built from random Fourier modes, we see qualitatively similar behavior, suggesting that at least some of this ordering is purely kinematic. By comparing our results from the experiment and the random field, we highlight the role played by the orientation of the rate of strain tensor in the energy transfer process; additionally, our results allow us to pose several intriguing conjectures
What St. Paul Really Said (audio)
No full textPaul was a zealous Jew whose explosive meeting with Jesus led him to believe that Israel’s God had declared Jesus to be the Messiah, and hence the true Lord of the who le world. N.T. Wright, Canon Theologian of Westminster Abbey and author of What St. Paul Really Said, determines the best way to understand Paul 20 centuries later. He will explain that Paul’s commission to be the “apostle to the Gentiles̶ 1; led him to hammer out a theology that was essentially a Jewish message for the pagan world, reshaped around Jesus, energized by the Spirit, and taking shape as a deeply personal and political message. Rediscovering his complex but breathtaking vision o f God, the world and the gospel is a central element in the urgent tasks facing today’s church
Quantitative analysis of human brain MR images at ultrahigh field strength
No full textT2*-weighted imaging provides a non-invasive means to study susceptibility changes of substances such as myelin and iron in the brain. Particularly, phase images show an increased sensitivity to magnetic susceptibility differences with increased field strengths. The primary goal of the thesis was to develop methods for quantitative analysis of human brain T2*-weighted images at ultrahigh field strength. Additionally, it was also aimed to investigate the use of textural features derived from whole-brain deformation field for classification of Alzheimer__s disease (AD). A framework for the detection of between-group textural differences in 7T T2*-weighted magnitude and phase images of subcortical structures was presented, and its application was demonstrated in Huntington__s disease. A novel algorithm for segmentation of the cerebral cortex from 7T T2*-weighted images was proposed and extensively validated. Subsequently, a highly automated method was proposed for quantification of regional changes in these images in terms of gray matter/white matter contrast and cortical profile. In addition to an analysis of aging effect using data of young and elderly healthy subjects, this method was also applied to compare early- and late- onset AD patients. The analysis techniques presented in this thesis can be useful tools for susceptibility studies using ultrahigh field MR imagesUBL - phd migration 201
Border walls, pushbacks, and the prohibition of collective expulsions: The Case of N.D: The N.T. v. Spain
No full textThis essay explores the impact of N.D. and N.T. v. Spain on the ECHR system. The case deals with the immediate return of aliens at Melilla's border fence. Based on conceptual analysis, the author submits to critical scrutiny the arguments developed by the ECtHR. The Court's reasoning is framed within the riveting interdisciplinary debate on external border control. The Grand Chamber's final decision reduces the scope of the protection offered by Article 4 Protocol 4, for it introduces a highly indeterminate exception to the prohibition of summary returns at the border. The author suggests that this solution might favor non-entrée strategies and promote the current trend of externalizing the asylum procedures. Introducing broad exceptions to the prohibition of collective expulsion, especially if coupled with strong presumptions in favor of States, increases the effectiveness of border walls qua accountability waivers
N.T. Steamer, Mirror Landing
No full textPhotograph - People on the deck of a paddle-wheeler at the shore, Albert
Study on aerodynamic imbalance of wind turbine rotors: An investigation of effects due to blade pitch assymetry.
No full textEWEMWind EnergyAerospace Engineerin
Aporia, cruciform story, incongruous call: Rom 9-11 as interpreted by Michael Wolter, N.T. Wright and John M.G. Barclay
No full textDie vorliegende Masterarbeit untersucht die von Michael Wolter, N.T. Wright und John M.G. Barclay in jüngerer Zeit vorgelegten Interpretationen von Röm 9-11. Die Analysen der jeweiligen Autoren folgen den gleichen Schemata. Jedes Hauptkapitel beginnt mit einer Erörterung davon, in welchem umfassenden Bezugsrahmen der jeweilige Autor die paulinische Theologie stellt. Als nächstes wird die Einschätzung des Autors hinsichtlich des Anlasses des Römerbriefs sowie dessen Stellungnahme bezüglich des spezifischen Themas von Röm 9-11 dargestellt. In einem weiteren Schritt wird analysiert wie der jeweilige Autor die Argumentation des Paulus in Röm 9-11 rekonstruiert. Zuletzt wird dessen Sicht auf die gegenwärtige Bedeutung von Röm 9-11 kurz dargestellt. Im letzten Kapitel, bezieht der Verfasser der vorliegenden Masterarbeit in kritischer Auseinandersetzung mit Wolter, Wright und Barclay bezogen auf die vorangegangene Erörterung Stellung; und zwar hinsichtlich des umfassenden Bezugsrahmens der paulinischen Theologie, des Anlasses der Römerbrief, des Themas von Röm 9-11, sowie die Argumentation des Paulus in dieser Kapiteln. Abschließend folgen Überlegungen zur heutigen Bedeutung von Röm 9-11 im jüdisch-christlichen Dialog.The present Master’s thesis examines three recent interpretations of Rom 9-11, namely those of Michael Wolter, N.T. Wright and John M.G. Barclay. The analysis of each author follows the same procedure. Each main chapter begins with a consideration of how the respective author frames Paul’s overall theology. Next, what the respective author finds to be the occasion for Paul’s letter to the Romans in general is considered, which is followed by the author’s statement of the theme of Rom 9-11 in particular. In a further step, the author’s reconstruction of Paul’s argument in Rom 9-11 is presented and, finally, his view of the contemporary significance of Rom 9-11 is briefly presented. In the final chapter, the author of the present thesis takes up a tentative position, in critical engagement with Wolter, Wright and Barclay, with regard to the framing of Paul’s theology, the occasion of Romans, the theme of Rom 9-11 and Paul’s argumentation in those chapters. Finally, the thesis concludes with some fresh considerations of the usefulness of Rom 9-11 for Jewish Christian dialogue today
Hydrodynamics and morphodynamics of a seasonally forced tidal inlet system
No full textTidal inlets along the central coast of Vietnam are highly dynamic and variable under the influence of seasonal climatic regime. The strong episodic processes of river flow and wave action cause the inlet morphologies to be changed frequently and unpredictable. Despite the interests and research on tidal inlets have been growing in recent decades, the mechanisms behind morphodynamics and behaviours of tidal inlets located in tropical monsoon areas with strong episodic river flow influences are still poorly understood. Effective engineering solutions for the inlets could not be found without understandings of the physical processes underlying the morphodynamics and behaviours of the inlets. This research work focuses on the hydrodynamics and morphodynamics of a tidal inlet system located on a microtidal wave dominated coast in the region. Further insights into the morphodynamics and behaviour of the inlet system has been gained in the present study based on the analyses observed data and numerical model simulation to address the role and the influence of each physical process on the morphology and the behaviour of the inlets. Although the study is focused on a specific tidal inlet system, the principles, approaches and some results of the study may be applied to, or at least, give a hint for other inlets in the regionHydraulic EngineeringCivil Engineering and Geoscience
Experimental data on Stone Stability under non-uniform flow
No full textPrevious research (e.g., Jongeling et al 2003; Hofland 2005) has shown that turbulence has an important influence on stone stability and in non-uniform flow it should be modeled explicitly. The dimensionless entrainment rate should be used to describe the bed response because of its complete dependence on local hydrodynamic conditions and independencies on time and bed material. In all studies where entrainment rate data are available, the correlation between the flow forces and the bed response still shows a high scatter level (e.g. the data of Jongeling et al (2003) and De Gunst (1999). Therefore, more experiments are needed to increase understanding of this cause-and-effect relation and to verify the available stability parameters for non-uniform flow. In this research, experiments were carried out in which both the bed response (quantified by a dimensionless entrainment rate) and the flow field (velocity and turbulence intensity distributions) are measured. The flow in a gradual expansion ope nchannel and its influence on stone stability were chosen to study as in such a flow the turbulence intensity is high. Three experimental set-ups with different expansion dimensions were used to create different combinations of velocity and turbulence. The nine-month experiment1 has resulted in a huge amount of data available. In this report the experiment arrangement and data processing methods that are employed are described and the measured data and some calculated variables are presented. The report is structured as follows. In Section 2 the experimental set-ups are described in additional to the instrumentation, hydraulic conditions and experimental procedures. Data processing methods is briefly described in Section 3. In Section 4 the measured data to determine stone parameters are presented. Finally in Section 5 the measured data and calculated variables are presented in detail.Civil Engineering and Geoscience
The B009 data in the backward facing step experiment
No full textThis report evaluates the B009 data of the back-ward facing step experiment which was one of a series of the experiments that were designed and conducted by Hofland and Booij (2004) and De Ruijter (2004). In this experiment, the flow field and the pressure field were measured (by PIV and pressure sensors) during the displacement of a single stone from a granular bed. This measurement shows similarities to the results from previous experiments. At the time the stone started to move, two flow structures were found to be responsible for the entrainment: a large-scale sweep (u'>0 and v'>0), causing increased quasi-steady forces, and an embedded small-scale structure with vertical velocity fluctuations, sigma(v'), causing turbulence wall pressure fluctuation (TWP). In the four entrainments, these structures were present simultaneously in the instantaneous flow fields.Civil Engineering and Geoscience
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