Die vorliegende Arbeit soll einen Überblick geben über die seit der Erklärung der Washingtoner Grundsätze in Bezug auf das Bibliothekswesen in Deutschland unternommenen Bemühungen in der Provenienzforschung zur Identifizierung und Restitution von NS-Raubgut. Ausgehend von den politischen Rahmenbedingungen sollen zunächst bibliotheksbezogene Einrichtungen und Orientierungshilfen vorgestellt werden, um im Hauptteil der Arbeit den aktuellen Stand der Forschungen und Aktivitäten ausgewählter Bibliotheken zu skizzieren. Eine vertiefende Darstellung einzelner Aspekte, wie etwa der politischen Relevanz, der methodischen Schwierigkeiten der Provenienzforschung oder auch der komplexen Probleme bei Restitutionsfragen, kann hier nicht geleistet werden. Die Arbeit ist begründet in der während fünfzehnjähriger Bibliothekspraxis gereiften Einsicht in die Notwendigkeit und Dringlichkeit eines – von Jürgen Weber geforderten – „neuen Sammlungsmanagements“.:Vorbemerkung 1 „ … ein Echo ihrer Gegenwart“ 2 1. Politische Rahmenbedingungen 2 1.1. Washingtoner Erklärung 2 1.2. Gemeinsame Erklärung 3 1.3. Hannoverscher Appell 3 2. Zentrale Einrichtungen 4 2.1. Koordinierungsstelle Magdeburg 4 2.2. Arbeitsstelle für Provenienzforschung 4 2.3. Deutsches Zentrum Kulturgutverluste 5 3. Orientierungshilfen für die Praxis 4 3.1. Handreichung 4 3.2. Leitfaden 5 4. Zum Stand der NS-Raubgutforschung in deutschen Bibliotheken 6 4.1. Ergebnisse der Umfrage des DBV 2004 6 4.2. Auswertung der Datenbank Lost Art 7 4.3. Auswertung der Statistik der Arbeitsstelle für Provenienzforschung 9 5. Aktivitäten deutscher Bibliotheken in der NS-Raubgutforschung 10 5.1. Projekte einzelner Bibliotheken 10 5.2. Restitution 14 6. Passivität und Unwegsamkeiten 15 6.1. Exkurs: Baden-Württemberg 15 6.2. Schwierigkeiten 16 6.3. Desiderate 16 Literaturverzeichnis 18

The bacterial protein H-NS acts to silence horizontally acquired genes. H-NS physically interacts via its N-terminus with two paralogous proteins, Hha and YdgT. Deletion of hha and ydgT results in derepression of a subset of H-NS repressed genes. I compared expression of hha/ydgT-dependent genes in Salmonella strains lacking hns and hha/ydgT/hns. Deletion of all three genes does not result in greater gene expression than deletion of hns alone, indicating that Hha and YdgT cannot act to repress genes in the absence of H-NS. Further, I used site-directed mutagenesis to generate H-NS proteins incapable of binding Hha. Complementing an hns deletion with an Hha-blind H-NS molecule, H-NS I11A, recapitulated the pattern of gene expression in the hha/ydgT strain. Indicating that elimination of the Hha-H-NS interaction is sufficient to result in derepression of hha/ydgT repressed genes. Hha and YdgT repress gene expression by acting through H-NS and cannot act independently of H-NS.

The bacterial protein H-NS acts to silence horizontally acquired genes. H-NS physically interacts via its N-terminus with two paralogous proteins, Hha and YdgT. Deletion of hha and ydgT results in derepression of a subset of H-NS repressed genes. I compared expression of hha/ydgT-dependent genes in Salmonella strains lacking hns and hha/ydgT/hns. Deletion of all three genes does not result in greater gene expression than deletion of hns alone, indicating that Hha and YdgT cannot act to repress genes in the absence of H-NS. Further, I used site-directed mutagenesis to generate H-NS proteins incapable of binding Hha. Complementing an hns deletion with an Hha-blind H-NS molecule, H-NS I11A, recapitulated the pattern of gene expression in the hha/ydgT strain. Indicating that elimination of the Hha-H-NS interaction is sufficient to result in derepression of hha/ydgT repressed genes. Hha and YdgT repress gene expression by acting through H-NS and cannot act independently of H-NS.

The purpose of this research was to develop a mobile ad-hoc network for collaborative Unmanned Aerial Vehicles (UAVs) based on a mesh networking standard called IEEE 802.11s. A low-cost, small form-factor, IEEE 802.11a based wireless modem was selected and integrated with the existing flight control system developed at Virginia Commonwealth University (VCU) UAV Laboratory. A self-configurable user-space application on the wireless modem was developed to provide functionality to collaborative algorithms, and to monitor the performance of the wireless network. The RAMS simulator, developed at VCU, was upgraded to support the simulation of advanced networking capabilities by integrating with a simulator called ns-3. The reconfigurability and performance of the IEEE 802.11s mesh network was validated and evaluated by conducting real-world flights. The results show that the IEEE 802.11s is a promising solution for collaborative UAV applications.

Neste trabalho, apresentamos um amplo estudo das interações de longo alcance entre átomos de Rydberg frios na presença de campos elétricos estáticos. Nós observamos a transferência de população do estado quase molecular nD + nD para o estado (n+2)P após excitação pulsada na região de 29 ≤ n ≤ 41 em uma amostra de Rb aprisionada em uma armadilha magneto-óptica. A taxa de transferência pode ser manipulada com a presença de campo elétrico estático. Para explicar tais observações um modelo teórico multiníveis foi utilizado. O estudo de evolução temporal da população em (n+2)P mostrou que a dinâmica do processo é condizente com a interpretação clássica de uma transição diabática no domínio temporal. Utilizando um laser de excitação contínuo, realizamos experimentos envolvendo estados nD + nD, para 37 ≤ n ≤ 45, e estados nS + nS, para 39 ≤ n ≤ 47, onde foi possível estudarmos processos de transferência de população com resolução da estrutura fina. Também realizamos experimentos, tanto para estados nD quanto nS, para verificar a importância da estrutura hiperfina da estado fundamental no processo de transferência de população. / In this work, we present an extensive study of long-range interactions between cold Rydberg atoms in the presence of static electric fields. We have observed the population transfer from the quasi-molecular nD + nD state to the (n +2) P state after pulsed excitation for 29 ≤ n ≤ 41 in a sample of Rb trapped atoms in a magneto-optical trap. The transfer rate can be manipulated by the static electric field. To explain such observations, a multilevel theoretical model was used. The study of the time evolution of the population (n +2) P indicates that the dynamics of the process is consistent with a classical interpretation of a nonadiabatic transition in time domain. Using a CW laser excitation, experiments involving states nD + nD, for 37 ≤ n ≤ 45 states and nS + nS for 39 ≤ n ≤ 47, where performed with high spectral resolution. We also performed experiments for both states, nD and nS, to verify the importance of the hyperfine structure of the ground state in the process of population transfer.

We present an experimental study on the behavior of bubbles captured in a Taylor vortex. The gap between a rotating inner cylinder and a stationary outer cylinder is filled with a Newtonian mineral oil. Beyond a critical rotation speed (ω[subscript c]), Taylor vortices appear in this system. Small air bubbles are introduced into the gap through a needle connected to a syringe pump. These are then captured in the cores of the vortices (core bubble) and in the outflow regions along the inner cylinder (wall bubble). The flow field is measured with a two-dimensional particle imaging velocimetry (PIV) system. The motion of the bubbles is monitored by using a high speed video camera. It has been found that, if the core bubbles are all of the same size, a bubble ring forms at the center of the vortex such that bubbles are azimuthally uniformly distributed. There is a saturation number (N[subscript s]) of bubbles in the ring, such that the addition of one more bubble leads eventually to a coalescence and a subsequent complicated evolution. Ns increases with increasing rotation speed and decreasing bubble size. For bubbles of non-uniform size, small bubbles and large bubbles in nearly the same orbit can be observed to cross due to their different circulating speeds. The wall bubbles, however, do not become uniformly distributed, but instead form short bubble-chains which might eventually evolve into large bubbles. The motion of droplets and particles in a Taylor vortex was also investigated. As with bubbles, droplets and particles align into a ring structure at low rotation speeds, but the saturation number is much smaller. Moreover, at high rotation speeds, droplets and particles exhibit a characteristic periodic oscillation in the axial, radial and tangential directions due to their inertia. In addition, experiments with non-spherical particles show that they behave rather similarly. This study provides a better understanding of particulate behavior in vortex flow structures. / Singapore-MIT Alliance (SMA)

In a wireless network, the medium is a shared resource. The nodes in the network negotiate access of the shared resource using the Medium Access Control (MAC) protocol. The design of a MAC protocol for a sensor node is not the same as that for a wireless transceiver. Due to the transceiver characteristics, the MAC protocol design is limited in terms of medium access methods. However, in most cases, the protocols rely on simple access methods i.e. Time Division Multiple Access (TDMA) or Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA). Control and monitoring applications, running over a wireless network, are typical examples of Wireless Sensor Actuator Network (WSAN) application in industries. In an industrial network, the message deliveries must be time-bounded otherwise, they are of no use. This report aims to present the thesis work carried out at ABB AB, Västerås. The purpose of this thesis was to compare the performance of WLAN and WirelessHART when it comes to control applications. For the purpose of WLAN, the media access schemes are analyzed in terms of deadline misses. There are other metrices for the performance evaluation but our focus was on the latency, since it is very important in the field of industrial automation. NS-2 was used for the purpose of MAC layer analysis and it is also shown that PCF gives better performance as compared to DCF, in terms of deadline misses. Finally, WLAN is proven to accommodate more control loops as compared to WirelessHART for a given scenario.

To support the transmission of real-time multimedia stream, Stream Control Transmission Protocol (SCTP) developed by IETF is considered to be more efficient because of its high-degree expandability and compatibility. Today we can observe that instead of using SCTP may become the transmission protocol of next-generation IP network. In this Thesis, we propose a mechanism to upgrade TCP and UDP, the multi-home feature of SCTP to ensure that multiple paths can exist between two SCTP ends. Not only can the primary path continue to function, but the secondary paths covey part of data packets once the network congestion occurs. Considering the dynamic change of our Internet, the proposed mechanism can enhance the effectiveness of SCTP data transmission, and increase overall network utilization. Cutting user data into chunks in SCTP, we can analyze the transmission performance of individual path by measuring the transmission delay from the sender to the receiving end. By modifying the simulator of NS-2, we set up different topologies in the experiment to analyze the performance of our mechanism. We compare the modified SCTP with the original SCTP to highlight our proposed mechanism in increasing throughput and network utilization by adjusting the background traffic on the paths.

This thesis investigates how “performance” can enhance the urban fabric of Dartmouth NS, and assist in the revitalization of the area, creating a “new community image”. In past decades Dartmouth has struggled to maintain its identity separate from Halifax in the social imagination of its inhabitants. Dartmouth has succumbed to urban sprawl, an aging population, and A lack of renewal in the downtown core, having fallen under the shadow of neighboring Halifax, as a destination for habitation, business and entertainment. In recent years, an urban renaissance led by new downtown businesses has begun, but there are still a great deal of under utilized spaces and vacant lots within the urban fabric and the incentive for redevelopment is low. This thesis asks can notions of “performance”, such as visual connections and focus be used to spatially and pragmatically activate under utilized areas within the urban core to foster revitalization and promote a positive social image, supporting Dartmouth in becoming a desired destination.

Neste trabalho, apresentamos um amplo estudo das interações de longo alcance entre átomos de Rydberg frios na presença de campos elétricos estáticos. Nós observamos a transferência de população do estado quase molecular nD + nD para o estado (n+2)P após excitação pulsada na região de 29 ≤ n ≤ 41 em uma amostra de Rb aprisionada em uma armadilha magneto-óptica. A taxa de transferência pode ser manipulada com a presença de campo elétrico estático. Para explicar tais observações um modelo teórico multiníveis foi utilizado. O estudo de evolução temporal da população em (n+2)P mostrou que a dinâmica do processo é condizente com a interpretação clássica de uma transição diabática no domínio temporal. Utilizando um laser de excitação contínuo, realizamos experimentos envolvendo estados nD + nD, para 37 ≤ n ≤ 45, e estados nS + nS, para 39 ≤ n ≤ 47, onde foi possível estudarmos processos de transferência de população com resolução da estrutura fina. Também realizamos experimentos, tanto para estados nD quanto nS, para verificar a importância da estrutura hiperfina da estado fundamental no processo de transferência de população. / In this work, we present an extensive study of long-range interactions between cold Rydberg atoms in the presence of static electric fields. We have observed the population transfer from the quasi-molecular nD + nD state to the (n +2) P state after pulsed excitation for 29 ≤ n ≤ 41 in a sample of Rb trapped atoms in a magneto-optical trap. The transfer rate can be manipulated by the static electric field. To explain such observations, a multilevel theoretical model was used. The study of the time evolution of the population (n +2) P indicates that the dynamics of the process is consistent with a classical interpretation of a nonadiabatic transition in time domain. Using a CW laser excitation, experiments involving states nD + nD, for 37 ≤ n ≤ 45 states and nS + nS for 39 ≤ n ≤ 47, where performed with high spectral resolution. We also performed experiments for both states, nD and nS, to verify the importance of the hyperfine structure of the ground state in the process of population transfer.