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Efficient quasi-three-level laser operation requires the generation of the highest possible pump rate from a given pump source. We derive the fundamental scaling laws for the pump rate and we extract optimization criteria for pump concepts from these laws. The analysis is then applied to the thin-disk laser. Based on the results, a novel pump concept for thin-disk lasers is proposed, which allows for several tens of pump beam passes and reduces the optical complexity of conventional pump concepts. Furthermore, the beam quality of the pump source is preserved almost completely, facilitating the highest possible pump rate.
Reservoir sedimentation, a serious problem affecting the majority of reservoirs worldwide, was not systematically accounted for in the past. After 50 years of operation, a constantly decreasing reservoir volume becomes currently a serious challenge for reservoir owners, against which countermeasures have to be developed. This research focuses on sediment routing using a bypass tunnel to convey sediments past a dam.
By transporting sediments into the tailwater past a dam, their accumulation in the reservoir is reduced significantly. However, the global number of sediment bypass tunnels is limited primarily due to high investment and maintenance cost. The main problem of all bypass tunnels is the massive invert abrasion due to high flow velocities combined with high sediment transport rates. Therefore, VAW started two research projects to counter this problem. The main goal of the first project Layout and design of sediment bypass tunnels is to investigate the invert abrasion process by conducting hydraulic laboratory tests and to establish general design criteria for optimal flow conditions in which both sediment depositions in the tunnel are avoided and the resulting abrasion damages are kept at a minimum. The second project Optimizing hydroabrasive-resistant materials at sediment bypass tunnels and hydraulic structures investigates the hydraulic resistance of different tunnel invert materials, such as high performance concrete or cast basalt plates in prototype tests at the Solis bypass tunnel. The sediment transport measurement technique used in this project was optimized during preliminary model tests.
Reservoir sedimentation is increasingly affecting the majority of reservoirs all over the world. As many dams are more than 50 years of age, this problem is becoming more and more seriou403s nowadays. Reservoir sedimentation leads to various severe problems such as a decisive decrease of the active reservoir volume leading to both loss of energy production and water available for water supply and irrigation. These problems will intensify in the very next future, because sediment supply tends to increase due to climate change. Therefore coun-termeasures have to be developed. They can be divided into the three main categories sediment yield reduction, sediment routing and sediment removal. This paper focuses on sediment routing by means of sediment bypass tunnels. Sediment bypass tunnels are an effective measure to stop or at least decrease the reservoir sedimentation process. By routing the sediments around the reservoir into the tailwater in case of flood events sediment accumulation of both bed load and suspended load is reduced significantly. However, the number of sediment bypass tunnels in the world is limited primarily due to high investment and above all maintenance costs. The state-of-the-art design criteria of constructing bypass tunnels are summarized herein; major problems such as tunnel invert abrasion are discussed. The need for further research regarding sediment transport in bypass tunnels and invert abrasion is highlighted.
Boiling heat transfer on large diamond and SiC heaters: The influence of thermal wall properties
(2011)
Strategic Marketing of Higher Education Institutions: Missions' and Customers' Identification
(2011)
The role of homophase and heterophase interfaces on transport properties in structured materials
(2011)
Analytical features of particle counting sensor based on plasmon assisted microscopy of nano objects
(2011)
Direct ethanol fuel cells with Zn(S,Se) as electrocatalysts, Bunsentagung, Berlin 2.-4.6.2011
(2011)
Pr3+ - The Multitasking Ion
(2011)
On the PL Efficiency and Stability of (Ca,Sr,Ba)SiN2:Eu2+ Phosphors for Solid State Light Sources
(2011)
STAMPPP - Science and the treatment of autism: A multimedia package for parents and professionals
(2011)
Despite increasing scholarly interest in commercialisation and university-industry linkages (UIL), a number of gaps remain in the theoretical development of this area. In particular, researchers have not yet been able to identify whether critical success factors for commercialisation change at various stages of partnership evolution. That means, as UILs increase in commitment and joint activities, how do we best manage and foster these developing partnerships at various stages of the development? The research study draws on relationship marketing theory, which shows a developing stream of research into changes of relationship characteristics and performance throughout relationship development. The qualitative phase of this study consisted of a series of semi-structured in-depth interviews with members of industry and academia in Australia and Germany/Netherlands who are involved in UILs. Some interviews were conducted face-to-face, others by phone. Over the course of an hour, participants were questioned about their involvement and experience with UILs, with a particular focus on relationship evolution. All UILs are different, uniting a range of individuals from different backgrounds and organisations, with varying skills, needs and objectives. While each UIL thus should be considered on its own, the results clearly indicate that (1) relationships evolve over time and that (2) a number of key factors appear as relevant across a cross-section of linkages. The research identified three UIL phases as well as a pre- and post-linkage stage, each characterised by a distinct measure of success. As illustrated in the model on the following page, while each of these phases had different drivers of success, common threads emerged, similarly in Australia and Germany. In particular, communication, trust, personal relationships, understanding and meeting expectations (delivery) emerged as critical throughout a linkage lifecycle, yet in different forms. It should be noted, however, that relationships do not evolve linearly. Rather, dissolution or positive divergence, for example due to a lack of immediate projects or other relevant activities, may arise at any time and may entail a re-evaluation of various aspects of the UIL and its future.