Die vorliegende Arbeit widmet sich der, vorwiegend experimentellen, Untersuchung der Wirkung wandparalleler Lorentzkräfte in Strömungsrichtung auf Grenzschichtprofile und Körperumströmungen. Die Themen - Beeinflussung der Grenzschicht an ebenen Platten mit stationären Lorentzkräften - Kontrolle von Strömungsablösungen an Zylindern und symmetrischen Profilen mit stationären Lorentzkräften - Beeinflussung von Zylindernachläufen und abgelösten Tragflügelumströmungen mit zeitlich periodischen Lorentzkräften werden behandelt.

<p>When launching a satellite a separation system is used to keep the satellite attached to a launch vehicle during ascent and to separate it from the launch vehicle while in space. In separation analysis the separation is studied by simulations to see if requirements on the system can be fulfilled. The purpose of this master’s thesis is to investigate if separation analysis can be done using the modeling program OpenModelica and to evaluate OpenModelica and compare it to other modeling programs.</p><p>OpenModelica is free software implementing the Modelica language, which is an object-oriented language for modeling and simulation of complex physical systems. Modelica uses equation-based modeling, this means that the physical behaviour of a model is described by differential, algebraic and discrete equations and no particular variable needs to be solved manually.</p><p>The work is divided into two parts. The main part is to implement a mathematical model of a separation system in OpenModelica, simulate it and study the behaviour of the system. A Monte Carlo method, which randomly generates values for uncertain model parameters, is used when simulating the model. The other part of the work is to evaluate OpenModelica and compare it with other modeling programs, such as Matlab/Simulink, C/C++ and JAVA to see advantages and disadvantages with OpenModelica.</p>

<p>The nearly unlimited applications and uses of starch for food industry make this natural polymer a unique component; no other constituent can provide consistence and storage stability to such a large variety of foods. Starch can be extracted from agricultural produce through either chemical processes or physical separation. The latter involves the application of centrifugal forces by means of hydrocyclones. A hydrocylcone is a device which separates, through physical methods, two phases of different densities. There are three flows involved: the feed (mixture introduced in the hydrocyclone), the overflow (the least dense part) and the underflow (the densest part). Normally, the underflow part, or commonly known as "heavies", is the desirable part that companies keep, this is, the starch. Despite hydrocyclones are not very expensive devices, current-based hydrocyclones demand high energy rates. This work describes the design and testing of energy-saving hydrocyclones for extracting starch from wheat. Eight prototypes were built and tested at Larsson Mekaniska Verkstad AB (Bromölla, Sweden). This company makes process equipment for the starch industry and was the one with which the author collaborated during the ellaboration of the Degree Project. Six of the eight hydrocyclones were built by Larsson; another was a commercial hydrocyclone and the last one was the one figured out after reading some literature and updates in the hydrocyclones field. The experiments consist of trying the eight hydrocyclones under different conditions, combining concentrations (153 g/L and 237 g/L) and pressures (500 Pa and 700 Pa). The experimental results proved the importance of geometry on hydrocyclone design, and showed the effect of geometrical parameters on the energy-saving properties of cyclones. Four of the eight new models behaved satisfactorily for low energy and high efficiency conditions, obtained with inlet pressures of 500 kPa and starch concentrations of 237 g/L.</p>

<p>Syftet med vår uppsats var att vi ville, genom intervjuer med familjehemsföräldrar och socialsekreterare, få kunskap om och djupare förståelse för små barn som lever i familjehem. Våra frågeställningar blev därmed: Vilka erfarenheter har familjehemsföräldrar/socialsekreterare av små barn som placeras? Vid ett omhändertagande, hur kan man bibehålla relationen mellan barn och biologiska föräldrar och vilka möjligheter har barn att knyta an till familjehemsföräldrar? Hur skiljer sig en placering som är frivillig från en tvångsplacering? Vilka erfarenheter har familjehemsföräldrar/socialsekreterare angående barns återförening till biologiska föräldrar? Resultatet från intervjuerna visade på att såväl familjehemsföräldrar som socialsekreterare upplever svårigheter vid placering av små barn och att man bäst bevarar relationen mellan biologiska föräldrar och barn genom kontinuerliga umgängen. Familjehemsföräldrar har inte upplevt några svårigheter för barnet att knyta an till dem och de har skilda erfarenheter av vilken form av placering som är mest gynnsam för barnet. Både familjehemsföräldrar och socialsekreterare framför att målet är att barnet ska återförenas med ursprungsfamiljen, men de kan se svårigheter när barnet känner tillhörighet i familjehemmet.</p>

Thesis (Ph. D.)--Ohio State University, 1978. / Includes bibliographical references (v. 2, leaves 751-789). Available online via OhioLINK's ETD Center.

Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.

Thesis (M.S.)--University of Hawaii at Manoa, 2005. / Includes bibliographical references (leaves 63-67). Also available via World Wide Web.

Thesis (Ph. D.)--University of Notre Dame, 2004. / Thesis directed by Michael J. Coppedge for the Department of Political Science. "April 2004." Includes bibliographical references (leaves 263-277).

Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 17, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Thesis advisor: Dr. M. Lynne Cooper. Includes bibliographical references.

Thesis (Ph. D.)--West Virginia University, 2003. / Title from document title page. Document formatted into pages; contains vii, 161 p. : ill. Includes abstract. Includes bibliographical references (p. 132-141).