No description available.

Introduction : Au sein de la population vieillissante, les chutes à domicile représentent une problématique importante (1 personne âgée/3 chute au moins 1 fois/année). Pour détecter automatiquement les chutes en respectant la vie privée, une technologie novatrice a été développée : la vidéosurveillance intelligente. Objectif : Explorer la perception et la réceptivité des personnes âgées concernant l’introduction de cette nouvelle technologie, à domicile. Méthodologie : Trente personnes âgées ont participé à une entrevue structurée (devis mixte). Une analyse de contenu (données qualitatives) et des analyses descriptives (données quantitatives) ont été effectuées puis combinées. Résultats : 93,4% des participants sont favorables (ou partiellement) à la vidéosurveillance intelligente et 43,3% l’utiliserait pour le sentiment de sécurité et la confidentialité procurés. Conclusion : Le contexte de vie des personnes âgées influence leur perception et réceptivité envers la vidéosurveillance intelligente. Il s’agit maintenant d’évaluer cette technologie dans divers milieux de vie. / Backgroung: Among the elderly, at-home falls are a significant problem (on average, 1 elder/3 falls at least 1/year). In order to automatically detect falls while maintaining privacy, an innovative technology was developed: an intelligent videomonitoring system. Objective: To explore the perception and receptivity of the elderly regarding the introduction of this new technology at home. Methodology: Using a mixed methods design, 30 elderly underwent a structured interview. A content analysis (qualitative data) and descriptive analyses (quantitative data) were executed and then combined. Findings: 93.4% of the participants were favorable (or partially) to the intelligent videomonitoring system and 43.3% would use it for the sense of security and the privacy provided. Conclusion: The living situation of the elderly influences their perception and receptivity regarding an intelligent videomonitoring system. The next step will be to evaluate this new technology in various living environments.

Direct numerical simulations of the receptivity and instability of boundary layers on flat and curved surfaces are herein reported. Various flow models are considered with the aim to capture aspects of flows over straight and swept wings such as wall curvature, pressure variations, leading-edge effects, streamline curvature and crossflow. The first model problem presented, the flow over a swept flat plate, features a crossflow inside the boundary layer. The layer is unstable to steady and traveling crossflow vortices which are nearly aligned with the free stream. Wall roughness and free-stream vortical modes efficiently excite these crossflow modes, and the associated receptivity mechanisms are linear in an environment of low-amplitude perturbations. Receptivity coefficients for roughness elements with various length scales and for free-stream vortical modes with different wavenumbers and frequencies are reported. Key to the receptivity to free-stream vorticity is the upstream excitation of streamwise streaks evolving into crossflow modes. This mechanism is also active in the presence of free-stream turbulence. The second flow model is that of a Görtler boundary layer. This flow type forms on surfaces with concave curvature, e.g. the lower side of a turbine blade. The dominant instability, driven by a vertically varying centrifugal force, appears as pairs of steady, streamwise counter-rotating vortical rolls and streamwise streaks. The Görtler boundary layer is in particular receptive to free-stream vortical modes with zero and low frequencies. The associated mechanism builds on the excitation of upstream disturbance streaks from which the Görtler modes emerge, similar to the mechanism in swept-plate flows. The receptivity to free-stream vorticity can both be linear and nonlinear. In the presence of free-stream turbulence, nonlinear receptivity is more likely to trigger steady Görtler vortices than linear receptivity unless the frequencies of the free-stream fluctuations are very low. The third set of simulations considers the boundary layer on a flat plate with an elliptic leading edge. This study aims to identify the effect of the leading edge on the boundary-layer receptivity to impinging free-stream vortical modes. Three types of modes with streamwise, vertical and spanwise vorticity are considered. The two former types trigger streamwise disturbance streaks while the latter type excites Tollmien-Schlichting wave packets in the shear layer. Simulations with two leading edges of different bluntness demonstrate that the leading-edge shape hardly influences the receptivity to streamwise vortices, whereas it significantly enhances the receptivity to vertical and spanwise vortices. It is shown that the receptivity mechanism to vertical free-stream vorticity involves vortex stretching and tilting - physical processes which are clearly enhanced by blunt leading edges. The last flow configuration studied models an infinite wing at 45 degrees sweep. This model is the least idealized with respect to applications in aerospace engineering. The set-up mimics the wind-tunnel experiments carried out by Saric and coworkers at the Arizona State University in the 1990s. The numerical method is verified by simulating the excitation of steady crossflow vortices through micron-sized roughness as realized in the experiments. Moreover, the receptivity to free-stream vortical disturbances is investigated and it is shown that the boundary layer is most receptive, if the free-stream modes are closely aligned with the most unstable crossflow mode / QC 20101025

Als Teilprojekt des Themenkreises III "Transitionskontrolle" des Schwerpunkt-Forschungsprogramms "Transition" der Deutschen Forschungsgemeinschaft, konzentriert sich diese Arbeit auf experimentelle Grundlagenuntersuchungen zum laminar-turbulenten Grenzsichtumschlag. Die Experimente wurden in der Grenzschicht einer ebenen, parallel angeblasenen, hydraulisch glatten Platte durchgeführt. Einen besonderen Schwerpunkt bildet die Abhängigkeit der Entwicklung der Instabilitäten, der sogenannten Tollmien-Schlichting Wellen, von deren Schräglaufwinkel zur Plattenvorderkante. Weiterhin wird der Einfluss zahlreicher Parameter wie z.B. des Schalldruckpegels und der Anregungsfrequenz diskutiert. Die Anregung der Tollmien-Schlichting Wellen erfolgte über periodisches Ausblasen / Ansaugen von Luft durch oberflächenbündige Schlitze quer zur Strömungsrichtung. Mit einem zeitlich hochauflösenden, restlichverstärkendem Kamerasystem konnten Aufnahmen der Strömungsvisualisierung erzielt werden, die unter anderem die zeitliche Entwicklung von Wirbelstrukturen (Lambda- Wirbel) zeigen. Zur Analyse der experimentell gewonnen Daten werden vergleichend Berechnungen nach der "Linearen Stabilitätstheorie" diskutiert. Einen weiteren Schwerpunkt bilden Untersuchungen zur aktiven Transitionskontrolle. Dabei wird der künstlich angeregten Tollmien Schlichting Welle eine gegenphasige Störwelle stromab überlagert. Es konnte nachgewiesen werden, das mit diesem Verfahren entsprechend des Superpositionsprinzips, die anfängliche Störamplitude der Tollmien Schlichting Welle deutlich reduziert wird. Es kommt zu einer fast vollständigen Störauslöschung. Untersuchungen im Nahfeld der Störeinkopplung, sowohl im Bereich der Anregnung als auch der gegenphasigen Dämpfungseinkopplung, zeigen deren Auswirkung auf die Entwicklung der Grenzschicht. / A sub-project of the working group III, "Transition Control" of the German Research Community's project "Transition", this paper is focused on experimental fundamental investigations in the field of laminar-turbulent transition. The experiments were carried out in the boundary layer of a flat plat with tangential blowing. The main topic is the development of instabilities, or so-called Tollmien-Schlichting Waves (TSWs), based on the oblique angle between the TSWs and the leading edge. In addition the influence of other parameters, including the sound-pressure level and the frequency of the TSWs are discussed. The instabilities are initialised by suction and blowing through flush, oblique slots in the surface of a flat plate. Pictures of the flow visualisation, recorded with a high-speed camera system, show the time-resolved development of structures (Lamda-Vortices) within the boundary layer. In order to analyse the experimental data, a comparison is made between it and numerical calculations corresponding to the Linear Instability Theory. Another main topic is the investigation of the active transition control. According to the Super Position Principle a second wave with opposite phase is superimposed on the TSW. It can be demonstrated that this technique works with oblique waves too. The initialised instabilities can almost completely be cancelled out. Investigations very close to the initialising slots of the TSW with a high special resolution show their influence on the development of the boundary layer.

Introduction : Au sein de la population vieillissante, les chutes à domicile représentent une problématique importante (1 personne âgée/3 chute au moins 1 fois/année). Pour détecter automatiquement les chutes en respectant la vie privée, une technologie novatrice a été développée : la vidéosurveillance intelligente. Objectif : Explorer la perception et la réceptivité des personnes âgées concernant l’introduction de cette nouvelle technologie, à domicile. Méthodologie : Trente personnes âgées ont participé à une entrevue structurée (devis mixte). Une analyse de contenu (données qualitatives) et des analyses descriptives (données quantitatives) ont été effectuées puis combinées. Résultats : 93,4% des participants sont favorables (ou partiellement) à la vidéosurveillance intelligente et 43,3% l’utiliserait pour le sentiment de sécurité et la confidentialité procurés. Conclusion : Le contexte de vie des personnes âgées influence leur perception et réceptivité envers la vidéosurveillance intelligente. Il s’agit maintenant d’évaluer cette technologie dans divers milieux de vie. / Backgroung: Among the elderly, at-home falls are a significant problem (on average, 1 elder/3 falls at least 1/year). In order to automatically detect falls while maintaining privacy, an innovative technology was developed: an intelligent videomonitoring system. Objective: To explore the perception and receptivity of the elderly regarding the introduction of this new technology at home. Methodology: Using a mixed methods design, 30 elderly underwent a structured interview. A content analysis (qualitative data) and descriptive analyses (quantitative data) were executed and then combined. Findings: 93.4% of the participants were favorable (or partially) to the intelligent videomonitoring system and 43.3% would use it for the sense of security and the privacy provided. Conclusion: The living situation of the elderly influences their perception and receptivity regarding an intelligent videomonitoring system. The next step will be to evaluate this new technology in various living environments.

Als Teilprojekt des Themenkreises III "Transitionskontrolle" des Schwerpunkt-Forschungsprogramms "Transition" der Deutschen Forschungsgemeinschaft, konzentriert sich diese Arbeit auf experimentelle Grundlagenuntersuchungen zum laminar-turbulenten Grenzsichtumschlag. Die Experimente wurden in der Grenzschicht einer ebenen, parallel angeblasenen, hydraulisch glatten Platte durchgeführt. Einen besonderen Schwerpunkt bildet die Abhängigkeit der Entwicklung der Instabilitäten, der sogenannten Tollmien-Schlichting Wellen, von deren Schräglaufwinkel zur Plattenvorderkante. Weiterhin wird der Einfluss zahlreicher Parameter wie z.B. des Schalldruckpegels und der Anregungsfrequenz diskutiert. Die Anregung der Tollmien-Schlichting Wellen erfolgte über periodisches Ausblasen / Ansaugen von Luft durch oberflächenbündige Schlitze quer zur Strömungsrichtung. Mit einem zeitlich hochauflösenden, restlichverstärkendem Kamerasystem konnten Aufnahmen der Strömungsvisualisierung erzielt werden, die unter anderem die zeitliche Entwicklung von Wirbelstrukturen (Lambda- Wirbel) zeigen. Zur Analyse der experimentell gewonnen Daten werden vergleichend Berechnungen nach der "Linearen Stabilitätstheorie" diskutiert. Einen weiteren Schwerpunkt bilden Untersuchungen zur aktiven Transitionskontrolle. Dabei wird der künstlich angeregten Tollmien Schlichting Welle eine gegenphasige Störwelle stromab überlagert. Es konnte nachgewiesen werden, das mit diesem Verfahren entsprechend des Superpositionsprinzips, die anfängliche Störamplitude der Tollmien Schlichting Welle deutlich reduziert wird. Es kommt zu einer fast vollständigen Störauslöschung. Untersuchungen im Nahfeld der Störeinkopplung, sowohl im Bereich der Anregnung als auch der gegenphasigen Dämpfungseinkopplung, zeigen deren Auswirkung auf die Entwicklung der Grenzschicht. / A sub-project of the working group III, "Transition Control" of the German Research Community's project "Transition", this paper is focused on experimental fundamental investigations in the field of laminar-turbulent transition. The experiments were carried out in the boundary layer of a flat plat with tangential blowing. The main topic is the development of instabilities, or so-called Tollmien-Schlichting Waves (TSWs), based on the oblique angle between the TSWs and the leading edge. In addition the influence of other parameters, including the sound-pressure level and the frequency of the TSWs are discussed. The instabilities are initialised by suction and blowing through flush, oblique slots in the surface of a flat plate. Pictures of the flow visualisation, recorded with a high-speed camera system, show the time-resolved development of structures (Lamda-Vortices) within the boundary layer. In order to analyse the experimental data, a comparison is made between it and numerical calculations corresponding to the Linear Instability Theory. Another main topic is the investigation of the active transition control. According to the Super Position Principle a second wave with opposite phase is superimposed on the TSW. It can be demonstrated that this technique works with oblique waves too. The initialised instabilities can almost completely be cancelled out. Investigations very close to the initialising slots of the TSW with a high special resolution show their influence on the development of the boundary layer.

No description available.

Summaries in German and English / This thesis is a missiological case study analysing the reasons for conversions to Islam and Christianity among Kyrgyz people in post-Soviet Kyrgyzstan. The Kyrgyz people have a rich religious heritage with a history of more than 2,200 years. The uprooting of religion and the atheistic indoctrination by the Soviet government created a religious vacuum after the breakdown of the Soviet Union and caused a revival of religious receptivity in the society. Renewed receptivity to religion in the newly established sovereign Kyrgyzstan was followed by a rise in religious activity of Muslims and Christians beginning in the late 20th century. In only 15 years the number of mosques rose from 39 to 1,600 and the number of professing Christians increased from a few dozen to more than 7,000. This change between 1990 and 2005 developed in three stages through religious instability, an increase in missionary activity and the posturing of religious ideology during the government’s democratization process. A research of individual conversions produced complex results. Muslims were more attune to traditional religious thinking than were Christians. Most Muslims committed themselves to Islam because of their ancestral heritage. The secularization of society facilitated the Kyrgyz to convert to Christianity and turn to Christ due to a crisis in personal identity. Among Christians, conversions were primarily affected by relatives and friends persuading them through testimony and example. Most Kyrgyz becoming Muslims were significantly influenced by their parents. Faith in the existence of God was the basic prerequisite for both Muslim and Christian commitment to their respective beliefs. For Muslims it meant to obey the commandments of Allah, but Christians were led to confession of sins and to conversion. Changes in lifestyles and mindsets Muslims traced back to the Islamic religious tradition. For Christians, lives were affected through a relationship to Jesus Christ. / Die vorliegende Thesis ist eine missiologische Fallstudie, die die Gruinde der Hinwendung der Kyrgyzen in der post-sovietischen Zeit zum Islam und Christentum untersucht. Die Kyrgyzen haben ein reiches religioses Erbe einer uber 2200 jahrigen Geschichte. Doch mit der religiosen, Entwurzelung und der atheistischen Indoktrination durch die Sovietregierung entwickelte sich nach dem Zusammenbruch der Sovietunion ein religioses ,Vakuum" und bewirkten ein Wiedererwachen der religiosen Rezeptivitat in der Gesellschaft. Aufgrund der neuen religiosen Rahmenbedingungen in dem seit 1991 souveranen Kyrgyzstan folgte vonseiten der Muslime und Christen ein starker Anstieg religioser Aktivitaten. In nur 15 Jahren stieg die Anzahl der registrierten Moscheen von 39 auf uber 1600 und die Anzahl der Christen im gleichen Zeitraum von ein paar Dutzend auf uber 7000. Diese Entwicklung verlief im Zeitraum von 1990 bis 2005 in drei Abschnitten und war gekennzeichnet von anfanglichen religiosen Aufbruchen, einer Zunahme missionarischer Aktivitaten und einer religiosen Positionierung im Demokratiesierungsprozess. Die Untersuchung der individuell erlebten Hinwendungen brachte vielschichtige Ergebnisse hervor. So war der farmiliare Hintergrund der Muslime im allgemeinen religioser als der der Christen. Die meisten Muslime bekannten sich aufgrund ihrer Abstammung zum Islam. Die Sakularisierung der Familien begunstigte die Hinwendung der Kyrgyzen zum Christentum, die sich vor allem aufgrund einer existenziellen Auseinandersetzung zu Jesus wandten. Bei Christen waren es vor allem Verwandte und Freunde, die mit Worten und Leben auf Jesus hinwiesen, bei Muslimen die Eltern. Sowohl bei Muslimen als auch Christen war der Glaube an die Exitenz Gottes die wesentliche Vorraussetzung, wobei dies die Muslime zur Befolgung der Gebote Allahs, Christen zur Sundenerkenntnis und einer Bekehrung bewegte. Eine Lebens- und Sinnesanderung fuhrten Muslime auf den Islam und Christen auf ihre Beziehung zu Jesus Christus zuruck. / Christian Spirituality, Church History and Missiology / D. Th. (Missiology)

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Isaiah Berlin maintains that there are two distinct forms of freedom or liberty: negative and positive. Berlin’s principal claim is that negative liberty does not require that the self be somehow separate from the empirical world (causally aloof, or an originator of causal chains). My principal claim is that to be an agent is to be committed to a separation of self in this sense, thus that the self for its very being requires to possess a species of positive liberty. This conception proceeds in part from Immanuel Kant’s claim that there is a separation between spontaneity and receptivity. Commitment to this assertion allows there to be an understood distinction between the self as a spontaneous self-active agent that makes choices, and the self as a mere reactionary brute that does what it does by biological imperatives. In this thesis, I defend the view that negative liberty is subsumed under positive liberty: you cannot have the former without the latter. I am therefore taking a rationalist stance towards Berlin’s thinking. My methodology is to bring into consideration two perspectives upon the underlying normative principles within the space of reason. The first is of Kant’s understanding of the principle of responsibility and the activity of spontaneity; the second is John McDowell’s understanding of that principle and activity. The key claim of this thesis is that Berlin misunderstands what it is to be a chooser. To be a chooser is to be raised under the idea that one is an efficient cause; human children are brought up being held responsible for their reasons for acting. This principle allows mere animal being to be raised into the space of reason, where we live out a second nature in terms of reason. Using their conclusions I further investigate Berlin’s understanding of conceptual frameworks, taking particular interest in historic ‘universal’ conceptions that shape human lives. He too finds that that we are choosers is necessary for what it is to be human. I take his conclusion, and suggest that if he had had a clear understanding of the space of reason, the historic claim that we have choice would find a more solid footing in the principle of that space, in that we are responsible for our actions. I conclude that the upshot of understanding the ‘I’ as an originating efficient cause is that we treat ourselves as free from a universal determinism that Berlin himself disparages; and that the cost to Berlin is that all choice is necessarily the activity of a higher choosing self. It is part of a Liberal society’s valuing, by their societal commitment to, the ideology of raising our children to understand themselves as choosers, that we have choice at all. This is irrespective of whether that which fetters choice is internal or external to the agent, or of whether having self-conscious itself requires such a cultural emergence of second nature.