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CFX 11.0 is a Computational Fluid Dynamics (CFD) program for simulating the behavior of systems involving fluid flow, heat transfer, and other related physical processes. It works by solving the equations of fluid flow (in a special form) over a region of interest, with specified (known) conditions on the boundary of that region. This tool is used here to analyse the straw cutter which is used to comminute the straw which is left standing in the field after stripper header has stripped the grains from the crops. Stripper Header is a new technique different to conventional harvester machines and it is still under development and testing. It works on the principle in which grains are first stripped off from the head of the standing crop which helps in much reduced intake freeing up the separation systems to handle a larger volume of grains. But with this, the new problem of the disposal of the long, uncut straw left after stripping of grains arose. So a straw cutter is used after the stripper header stage in this Combine Harvester, where the rotor is equipped with pressed steel blades and rotates towards the crop, i.e., it cuts and lifts the straw over the top. This technique is environment friendly because previously farmers would have to burn the long, uncut straw standing in the fields while in this case mulched straw can be used for min-till systems. This rotor based straw cutting machine is analysed here which helps us in increasing power efficiency and comminution rate and quality of cut straw particles. Here fluid flow simulation has been preferred over particle simulation: - CFX 10.0 tool is not very effective for particle simulation techniques and computation time is increased considerably. - It’s very hard to realize particle simulation in CFX 10.0 because we have to define size and properties of each particle and besides this wall conditions would have to be defined differently for every boundary. - Besides this, it’s hard to realize cutting effect with straw particles in CFX 10.0 which otherwise would be comminuted in real life conditions. - The results obtained from fluid simulation are validated using experimental results and found to be nearly the same which clearly contradicts any need of performing particle simulation.
Rezension zu: Reinhard Stockmann (2006): Evaluation und Qualitätsentwicklung. Münster u.a.: Waxmann.
(2007)
Solvenztest
(2007)
Konzernabschlüsse
(2007)
Listening to music played by small MP3-players is almost as ubiquituous as talking over mobile phones. In this paper we analyse interaction elements and usabilty of current MP3-players. To determine the usability, an empirical study based on a website that presented three simulated MP3-players was performed with over 1000 participants.
The results show that, despite most marketing claims, some interaction devices are not as intuitive and really suitable for the task as they schould be. Also we found some surprising results concerning erroneous usage of navigation keys.
Archimedes sollte herausfinden, ob die Krone von Hieron II tatsächlich aus Gold sei. Das spezifische Gewicht von Gold war ihm bekannt, aber für die Bestimmung des Goldgehalts musste er das Volumen der Krone berechnen. Er dachte mehrere Tage darüber nach. Doch erst als er ein Bad nahm und beobachtete, wie sein Körper das Wasser verdrängte, erkannte er, dass er das Volumen der Krone über ihre Wasserverdrängung bestimmen konnte. Er rief: Heureka! ? Ich hab´s gefunden! Archimedes ist damit zum Sinnbild für plötzliche Geistesblitze geworden. Doch warum ist er nicht sofort auf die Lösung gekommen?