This thesis presents results on the theoretical description of ion acceleration using ultra-short ultra-intense laser pulses. It consists of two parts. One deals with the very general and underlying description and theoretic modeling of the laser interaction with the plasma, the other part presents three approaches of optimizing the ion acceleration by target geometry improvements using the results of the first part. In the first part, a novel approach of modeling the electron average energy of an over-critical plasma that is irradiated by a few tens of femtoseconds laser pulse with relativistic intensity is introduced. The first step is the derivation of a general expression of the distribution of accelerated electrons in the laboratory time frame. As is shown, the distribution is homogeneous in the proper time of the accelerated electrons, provided they are at rest and distributed uniformly initially. The average hot electron energy can then be derived in a second step from a weighted average of the single electron energy evolution. This result is applied exemplary for the two important cases of infinite laser contrast and square laser temporal profile, and the case of an experimentally more realistic case of a laser pulse with a temporal profile sufficient to produce a preplasma profile with a scale length of a few hundred nanometers prior to the laser pulse peak. The thus derived electron temperatures are in excellent agreement with recent measurements and simulations, and in particular provide an analytic explanation for the reduced temperatures seen both in experiments and simulations compared to the widely used ponderomotive energy scaling. The implications of this new electron temperature scaling on the ion acceleration, i.e. the maximum proton energy, are then briefly studied in the frame of an isothermal 1D expansion model. Based on this model, two distinct regions of laser pulse duration are identified with respect to the maximum energy scaling. For short laser pulses, compared to a reference time, the maximum ion energy is found to scale linearly with the laser intensity for a simple flat foil, and the most important other parameter is the laser absorption efficiency. In particular the electron temperature is of minor importance. For long laser pulse durations the maximum ion energy scales only proportional to the square root of the laser peak intensity and the electron temperature has a large impact. Consequently, improvements of the ion acceleration beyond the simple flat foil target maximum energies should focus on the increase of the laser absorption in the first case and the increase of the hot electron temperature in the latter case. In the second part, exemplary geometric designs are studied by means of simulations and analytic discussions with respect to their capability for an improvement of the laser absorption efficiency and temperature increase. First, a stack of several foils spaced by a few hundred nanometers is proposed and it is shown that the laser energy absorption for short pulses and therefore the maximum proton energy can be significantly increased. Secondly, mass limited targets, i.e. thin foils with a finite lateral extension, are studied with respect to the increase of the hot electron temperature. An analytical model is provided predicting this temperature based on the lateral foil width. Finally, the important case of bent foils with attached flat top is analyzed. This target geometry resembles hollow cone targets with flat top attached to the tip, as were used in a recent experiment producing world record proton energies. The presented analysis explains the observed increase in proton energy with a new electron acceleration mechanism, the direct acceleration of surface confined electrons by the laser light. This mechanism occurs when the laser is aligned tangentially to the curved cone wall and the laser phase co-moves with the energetic electrons. The resulting electron average energy can exceed the energies from normal or oblique laser incidence by several times. Proton energies are therefore also greatly increased and show a theoretical scaling proportional to the laser intensity, even for long laser pulses.

Gold Foil Figures or guldgubbar (henceforth GFFs) are precious metal artefacts from the Scandinavian Late Iron Age. This master's essay offers a new approach to GFFs. As opposed to the established understanding of GFFs as representational images with real or mythic referents, belonging to an aristocratic milieu, this essay instead attends to GFFs in terms of their material and Figural traits. The material for this study consists if 42 GFFs from the find site of Västra Vång, Blekinge, Sweden. A comprehensive presentation of this artefact material is a secondary aim of this essay. With the aid of a neomaterialist theoretical apparatus that draws heavily on the work of Gilles Deleuze, Félix Guattari, and Wilhelm Worringer, the 42 GFFs undergo two separate analyses. In the first, the material traits expressed in the sequence of GFF production and deposition is studied in terms of a chaîne opératoire. In the second, I attend to the non-significatory expressive qualities of form and expression, or Figural traits, belonging to these 42 GFFs within the wider artistic milieu of Animal Style Ornamentation. I conclude that GFFs were as a rule artefacts made for purposes of immediate disposal, not display, as a mode of dispersing gold. Västra Vång’s GFFs offer several indications that handling between the cutting operation and deposition was minimal, such as the fresh, unworn edges. The thin, brittle foils are ill suited to display. Approaching the designs on these artefacts as various sets of Figural traits being expressed allows me to contextualise the GFFs within the wider artistic milieu of Animal Style Ornamentation. New territorial rhythms can be established only as certain elements are freed from a settled state, and made to act together with new elements, in new terrains. GFFs bring about new territorial rhythms of form and expression to gold matter, gold made to circulate as it becomes deterritorialised from a monetary function within the Roman economy. A flow of gold is extended as gold is brought to Scandinavia from continental economies. The influx of this flow of gold is not contained to an élite social stratum. Individuals in possession of minute amounts of gold returned to Scandinavia, having acquired gold as payment for involvement in military operations on the continent. This ownership of gold may have hindered their harmonious reintegration into a society based on other economic principles. The GFFs emerge as a vector of dispersing gold. The artistic expression of Figural traits is equally energised by movements of de- and reterritorialisation. Understanding that the Figural traits expressed on the GFFs from Västra Vång are part of a wider artistic milieu of Animal Style Ornamentation, alongside other systematised expressions making up parts of a collective assemblage of enunciation, makes their appearance on artefacts that were deposited immediately upon their manufacture easier to grasp. The particular procedures of miniaturisation allowed for an acceleration of the expression of variation in the conjunction of a flow of artistic expression onto a flow of gold matter. The dispersive handling of gold must be traced to both the material premises and the expressive artistic ones. Gold is not chosen because it is precious, or because of what it connotes, but because it is available, because the artisan smith is attendant to its traits as a metal matter.

Idag ligger fokus på energieffektivisering av byggnader. I och med detta ligger tung vikt på fuktsäkerhetsprojektering i konstruktioner som i sin tur måste vara lufttäta och diffusionstäta. Kombinationen av svenska vinterperioder och övertrycket som uppstår inomhus medför att taken utsätts för stora påfrestningar. Luften inomhus innehåller alltid mer fukt än luften utomhus. Då fukt alltid strävar efter att jämna ut sig går den varma och fuktiga inomhusluften till utrymmen med lägre fukthalt eller lägre lufttryck. Det är bland annat av dessa anledningar man använder ångspärr i ytterväggar och takkonstruktioner. Syftet med detta projekt är att genomföra en fuktteknisk bedömning för takkonstruktioner uppbyggda av TRP plåt, PIR isolering utan plastfolie. Anledningen till att bygga tak utan plastfolie är att sätta fuktfrågorna i fokus vid nybyggnadsprojekt samt att eftersträva skapandet av fuktsäkra och sunda konstruktioner. För att analysera takkonstruktionen samt genomföra fukttekniska bedömningar har simuleringar av konstruktionen under olika förutsättningar i WUFI Pro 5.1. genomförts. Därefter har resultatet analyserats ur diffusions- och konvektionssynpunkt. Resultaten visar inga större skillnader ur diffusionssynpunkt. Dock är skillnaderna mer uppenbara ur konvektionssynpunkt. Fuktmängden i konstruktionen utan plastfolie var betydligt större än konstruktion med plastfolie. Resultaten visar på att luftläckaget och fuktmängden har ett proportionellt förhållande med luftspaltbredden som bildas mellan PIR isoleringselementen. Detta gäller om ingen plastfolie används i konstruktionen. Slutsatsen är att det råder en större risk för luftläckage hos takkonstruktionen utan plastfolie på grund av otätheter i skarvar och spalter. För att få en fuktsäker och sund konstruktion rekommenderar författarna att plastfolie används. / Nowadays there is a high focus on energy efficiency of buildings. Therefore, a lot of resources are dedicated to moisture management in order to ensure that constructions stay airproof and diffused.  The combination of Swedish winter periods and the overpressure that occurs indoors means that the ceilings are subjected to the great stress. Indoor air contains more moisture than the air outdoors. As moisture is always striving to even out, the hot and humid indoor air moves to spaces with lower moisture content or lower air pressure. It is partly for these reasons why it is necessary to use a vapor barrier in the outer wall and roof construction. The purpose of building roofs without plastic foil is to put moisture issues in focus for new construction projects, but also, seek to create moisture proof and healthy construction designs. Further the goal of this project is to conduct a moisture technical assessment of roof structures built by TRP plate and PIR insulation without plastic film. Additionally, investigate if PIR-insulation can act as diffusion and convection protection. In order to analyze the roof structure and conduct moisture technical assessments, the design has been simulated using WUFI Pro 5.1 during different conditions. The result has then been analyzed from diffusion and convection perspectives. The results showed no major differences when compared from diffusion point of view. However, the differences are more obvious from convection perspective. The amount of moisture in the construction without plastic foil was considerably larger than the construction with a plastic foil. The results also showed that the air leakage and moisture amount has proportional ratio to the air gap width between the PIR-insulation elements. This is the case if no plastic foil used in the construction. The conclusion is that there is a greater risk of air leakage in the roof construction without the plastic foil because of leaks in the joins or gaps. For a moisture-proof and healthy design, the authors recommend that a plastic foil should be used.

The proposed leisure center building Rowing Club bellows is located in southern part of the Brněnské přehrady between section Rakovec and Kozí horka. The building stands on existing club Lodní sporty Brno in the parcel čp. 1236. The idea of building is a ship sailing on the mainland, whose sails it look like waves. Student accommodation is designed to the second, third and fourth floor. Restaurant and administrative facilities connected to the terrace is designed in the basement. In the first underground floors are designed locker rooms, athletic facilities, kitchen and in the second underground floors is designed rowing pools and rowing boatyards connected to the ground. On the eastern side is a wooden rack tribune. Roads and pavements around the building are designed with simplicity and function.

No description available.

The master´s thesis deals with verification of thermal insulating property of thermoreflection foil insulations. The teoretical part of thesis focuses on the energy demand of buildings, the problems of heat transfer material, terms required for study of thermoreflection thermal insulation and experimental methods for determination of thermal insulating properties of insulators. In the next part the chapter is accompanied by an overview of the most common insulation materials which used in construction. The last part of teoretical part is devoted to the description of thermoreflect formation and analysis of the spread of thermal insulating layers of thermoreflection thermal insulation. The first part of thesis is devoted to the use of thermoreflection therm insulation in buildings. The second part of thesis is devoted to the design, assembly and calibration of the measuring device that uses a method of protected warm chamber. It is declared as a binding method of detection of the heat transfer performance of thermoreflection thermal insulation. The developed measuring device allows detection of endpoints in some direction of propagation of heat. Measurment of heat transfer coefficient devoted the third part of practical part. This part contains a description of the samples used for the measurement of the heat transfer coefficient. In the fourth chapter of the practical part are presented the results of the heat transfer coefficient measurments on selected samples of thermoreflection foil insulation. It is shown the characteristic of heat transfer coefficient of individual samples, the dependence of the heat transfer coefficient on the position of the sample in the measuring device and the recommendation of an appropriate use of sample in the works for the climatic conditions of the Czech republic. The work concludes the chapter of comparing and evaluating of all samples with practical recommendations.

This diploma thesis focuses on the implementation of waterproofing of underground constructions using an LLDPE membrane hinged on anchors. In the future, this method will replace the commonly used waterproofing system in Scandinavia with extruded polyethylene foam. This method of tunnel construction and waterproofing is compared with the NRTM method, often used in Central Europe. The thesis describes the installation of a waterproofing system, especially materials, accessories, welding devices and auxiliary installation equipment. The main focus of the thesis is to verify the reliability of the individual types of welds and to assess the waterproofing system in terms of implementation and environmental demands.

Parallel-plate avalanche counters, PPACs, are commonly used to detect fission fragments. The PPAC detects them and mark (very accurately) the time of detection. Such measurements can be used to measure the neutron energy (via time-of-flight) to study neutron-induced fission.This project report provides a method that, together with the discussed improvements, allows the fabrication of good quality PPAC detectors. Several PPACs are manufactured and the electrodes are built from 0.9 µm thick mylar foils which are evaporated with a 40-80 nm thin layer of aluminum.The developed PPACs are characterized with well known radioactive Cf and Am sources (the source characterization also found in this report), and compared against each other. Additionally, the PPAC signal amplitude spectrum are found to follow theoretical expectations with regards to angular dependence, gas pressure and an applied electrode voltage.At a specific applied electrode voltage and range of gas pressures (3-9 mbar), the measured time resolutions are 2.24-1.38 ns. A trend is observed for finer time resolutions at higher gas pressures. / Parallel-plate avalanche counters, PPACs, används ofta för att detektera fissionsfragment. PPAC:en detekterar fragmenten med väldigt god tidsupplösning och således kan PPAC detektorer användas till att mäta neutron energier (mha. flygtidsmetoden), vilka uppmätts för att studera neutroninducerad fission.Det här projektet och den här rapporten beskriver en metod, med föreslagna förbättringar, som möjliggör tillverkning av PPAC detektorer av bra kvalitet. Under projektet har flera PPACs byggts med elektroder gjorda av 0.9 µm tunn mylar förångade med 40-80 nm aluminium. De tillverkade PPAC detektorerna är karaktäriserade med väl kända radioaktiva Cf- och Am-källor (dessa karaktäriseras även i den här rapporten). Detektorerna är sedan jämförda mot varandra och är funna att följa teoretiska förväntningar med avseende på vinkel-, gastryck- och pålagd elektrodspänningsberoende.Resultaten av projektet, som besvarar flera tidigare frågeställningar och bekräftar vissa antaganden, flyttar utsikten och förståelsen framåt för hur PPACs fungerar och vad forskarna kan uppnå med dem.

科学研究費補助金 研究種目:試験研究 課題番号:61850069 研究代表者:日比野 倫夫 研究期間:1986-1987年度

The diploma thesis is partly dedicated to energetic efficiency of buildings and describes possibilities how to evaluate energetic efficiency of buildings in the Czech Republic. We also get to know with distribution of thermal insulators by material base and use in construction. There are also mentioned methods how to determine thermal insulations characteristics of heat insulations, so called heat conductivity coefficient. The last and the crucial chapter of theoretic part is dedicated to thermal-reflective insulations. There are mentioned some of the basic characteristics of insulations, material composition and heat transfer mechanism in their structure as well. Practical part describes measurement of thermal resistance of chosen samples of thermal-reflective insulations per measuring device on the principal of Hot Box method. In the next step was determined emissivity of aluminium foils which forms the surface of chosen samples of thermal-reflective insulations. In the end of thesis are defined possibilities of use thermal-reflective insulations in building structures especially in passive and low-energy buildings in climatic conditions of the Czech Republic.