This thesis compares the impact on disk performance in a GNU/Linux  environmentwith three encryption algorithms: AES,  Serpent and Twofish in three different implementations: DM-crypt, Loop-AES and Truecrypt. For all three algorithms a key length of 256 bits is used.The thesis shows that the least performance impact during data encryption, and thus file writing, is reached by using AES or Twofish encryption implemented in DM-crypt or TrueCrypt. The thesis shows that some data operations with a sufficiently low processor utilization barely affects disk performance at all if encrypted using the optimal implementation and algorithm.It is also discovered that the performance impact during data decryption, or file reading, can be minimized by using the most efficient implementation and algorithm. The best results are met with the AES or Twofish cipher, regardless of implementation.An important conclusion that  is  drawn is that it is hard to determine a superior encryption solution for all purposes. However, by reviewing and examining the collected data from all aspects of disk performance the AES implementation in TrueCrypt is, with small marginals, determined to be the most optimal..

Den tredje och fjärde oktober 1993 sköt somaliska rebeller ner två amerikanska Black Hawk-helikoptrar i Mogadishu, Somalia. Dels på grund av ett bristande doktrinärt agerande resulterade det i en 14 timmar lång strid om att överhuvudtaget överleva och många skadades eller omkom. Inte långt därefter lämnade FN och USA Somalia och insatsen sågs som ett militärt misslyckande. Insatsen i Somalia har påverkat amerikanarnas syn på utrikespolitik och den visar tydliga exempel på den komplexitet som counterinsurgency-operationer för med sig.Uppsatsen är en teoriprövande fallstudie där David Kilcullens teorier om upprorsbekämpning prövas på Specialförbandsstyrkan Task Force Rangers insats i Mogadishu, Somalia. Uppsatsen syftar inte till att pröva huruvida Kilcullens teorier fungerar eller ej, utan till att pröva hur och i vilken utsträckning Task Force Rangers medel och metoder överensstämmer med vad Kilcullen förespråkar.Resultatet av denna studie visar att förekomsten av Kilcullens teorier i vissa fall överensstämmer men överlag är väldigt få.

A Monte Carlo simulation of the ELECTRA reactor using (U,Zr)N fuel and a liquid lithium coolant is performed using the Serpent simulation code. The results show a reactor with a total reactivity coefficient of the coolant, fuel and material expansion that is strongly negative. These properties make the ELECTRA reactor a good candidate for a safe space reactor that could be used for propulsion of manned and unmanned space vehicles to Mars and other parts of our solar system..

A new build in the Swedish nuclear power system would entail increased re-quirements for the proposed repository, which is adapted after the reactors of today. With a fast reactor, capable of burning nuclear waste, operating in parallel with the light water reactors, the increased requirements on the repository could be reduced.In this thesis, simulations of a light water reactor and a fast reactor have been performed by using the Monte Carlo code Serpent to investigate the changes in the fuel inventory. The light water reactor in the study is a boiling water reactor and the fast reactor of the type sodium-cooled fast reactor and they have been used for three different operation scenarios.By studying the fuel composition and the results from the simulations of the three scenarios conclusions can be drawn. Conclusions regarding the change of the fuel inventory and decay heat in Clab as well as the interim storage facility and in the repository. Depending on the operation alternative the changes dif-fered significantly and especially regarding the mass of burned actinides for different fuels in the fast reactor.The lowest increase of fuel assemblies was meet when using 50 years old fuel with 20MWd/kg U burnout and 2,0 % enrichment for start up of the fast reactor and 30 years old fuel assemblies with 50MWd/kg U burnout and 4,7 % enrichment for the further operation of the reactor.The increase of the number of fuel assemblies was 3174, which is equivalent to 641tons of heavy metal.

This thesis analyses the intertextual relation between Birgitta Trotzig?s I Kejsarens tid and the works of the Polish author Bruno Schulz, using a hermeneutical method. The application of Manfred Pfister?s model for qualification of intertextual intensity initially motivates that the most important intertextual relations should be sought in the realm of ?refer to? rather than ?use?. According to the hermeneutical approach, the conclusion demands an exposition of Birgitta Trotzig?s interpretative practices in relation to intertexts.