The aim of thesis is description of polymer optical fiber (POF). In particular, focusing on their application and its associated standardization. After explaining the principle of signal transmission by polymer fibers, glass fibers are compared with the polymer fibers. The attention is then paid to the types of POF and their connectors. Another part is engaged in standards of polymer fibers, according to their area of application. Following chapter describes the application of polymer fibers in practice, especially in the automotive industry and sensor technology. Standalone chapter is dedicated to deploying POF fibers in LANs. It mentions comparasion with copper and wireless networks, summarizes the advantages and disadvantages. Chapter also provides an overview of the components used in POF - optical converter, switch with optical interfaces, optical network card, etc. In the practical part is created the design of home network for two-storey family house. The proposal was implemented by CableProject CAD software, first using copper cabling (UTP category 5e) and then using polymer fibers. Finally, both proposals are compared with each other. It has been made detailed financial analysis, compared performance of instalation and methods of cable instalallation. The practical part is also dedicated to measuring the parameters of POF networks, the impact of the attenuation loss, explores methods of joining glass and polymer fibers and is engaged in IPTV transmission simulation in real conditions.

Key words: connective, concession, concessive adverb, concessive connective, compétition Abstract: The diploma thesis "Les connecteurs concessifs pourtant, cependant, toutefois, néanmoins, quand même, tout de même" consists of three parts. The goal of the first part was to explain the notion of "concessive connective" (connecteur concessif) in a synchronic perspective. This first part consists on one hand in an attempt to explain the concessive relation (concession), on the other in a definition of the category of concessive connectives used in temporary French. The second part of this diploma thesis is dedicated to a diachronic and quantity-based study of the examined quasi-synonyms for the purpose of clarification of their frequency and competition regarding their usage down to the present day. In addition to these two parts, we reflect in the third part on the current use of concessive connectives, i.e. their use in contemporary written, spoken and pseudo-spoken language (on the Internet).

Passive and compact heat dissipation systems are and will remain vital for the successful operation of modern electronic systems. Oscillating heat pipes (OHPs) have been a part of this research area since their inception due to their ability to passively manage high heat fluxes. In the current investigation, different designs of tubular, flat plate, and multiple layer oscillating heat pipes are studied by using different operating parameters to investigate the operating limitations of each design. Furthermore, selective laser melting was demonstrated as a new OHP manufacturing technique and was used to create a compact multiple layer flat plate OHP. A 7-turn tubular oscillating heat pipe (T-OHP) was created and tested experimentally with three working fluids (water, acetone, and n-pentane) and different orientations (horizontal, vertical top heating, and vertical bottom heating). For vertical, T-OHP was tested with the condenser at 0°, 45° and 90° bend angle from the y-axis (achieved by bending the OHP in the adiabatic) in both bottom and top heating modes. The results show that T-OHP thermal performance depends on the bend angle, working fluid, and orientation. Another design of L-shape closed loop square microchannel (750 x 750 microns) copper heat pipe was fabricated from copper to create a thermal connector with thermal resistance < 0.09 ˚C/W for electronic boards. The TC-OHP was able to manage heat rates up to 250 W. A laser powder bed fusion (L-PBF) additive manufacturing (AM) method was employed for fabricating a multi-layered, Ti-6Al-4V oscillating heat pipe (ML-OHP). The 50.8 x 38.1 x 15.75 mm3 ML-OHP consisted of four inter-connected layers of circular mini-channels, as well an integrated, hermetic-grade fill port. A series of experiments were conducted to characterize the ML-OHP thermal performance by varying power input (up to 50 W), working fluid (water, acetone, NovecTM 7200, and n-pentane), and operating orientation (vertical bottom-heating, horizontal, and vertical top-heating). The ML-OHP was found to operate effectively for all working fluids and orientations investigated, demonstrating that the OHP can function in a multi-layered form, and further indicating that one can ‘stack’ multiple, interconnected OHPs within flat media for increased thermal management.

Purpose: The purpose of this study was to evaluate the fracture strength of monolithic FDPs of multi-layered zirconia (YML) with different connector dimensions and placement in the disc. Material and method: Forty 3-unit monolithic anterior FDPs were produced, 212223, and divided in four groups (n=10) based on the different connector dimensions and strategies for placement in KATANATM Zirconia Yttria Multi-Layered (YML)-disc. The groups were as follows: EB12, produced with 12 mm  connector dimension and EB7, with 7 mm  connector dimension which were both placed in Enamel layer and Body layer 1 (flexural strength: 750 and 1000 MPa, respectively) in the disc, BB12, with 12 mm  connector dimension and BB7, produced with 7 mm  connector dimension both placed in Body layer 2 and 3 (both with 1100 MPa) in the disc. The specimens were artificially aged by 10 000 cycles in thermocycling. Then, one random specimen was selected from each group (4 in total) and cemented onto the model, subsequently loaded to fracture using a universal testing machine. The result was compiled and reported descriptively. Result: The FDP in group BB12 remained intact and fracturing only occurred in this model at 893 N. The FDP in group BB7 demonstrated the highest fracture strength (972 N), followed by EB12 (842 N) and EB7 which showed the lowest fracture strength (465 N). All these three FDPs broke mesially on the pontics. Conclusion: Within the limitations of this pilot study, the following conclusions can be drawn: the fracture strength of monolithic FDPs of multi-layered zirconia is affected by the connector dimension. Placement of FDPs with a small connector area should be avoided in the layers with lower strength. The choice of model material affects the result. / Syfte: Syftet med föreliggande pilotstudie var att undersöka brotthållfastheten påmonolitiska broar av flerskiktad zirkonia (YML) med olika konnektordimensioneroch placering i disken. Material och metod: Totalt framställdes 40 stycken 3-leds monolitiska anteriorabroar, 212223. Broarna delades in i 4 grupper (n=10) efter olikakonnektordimensionering och placering i KATANATM Zirconia YttriaMulti-Layered (YML)-disken. Grupperna var enligt följande: EB12 med 12 mm²konnektordimension och EB7 med 7 mm² konnektordimension där broarnaplacerades i både Enamel Layer och Body Layer 1 (med 750 respektive 1000 MPai böjhållfasthet) i disken. Broarna i grupperna BB12 med 12 mm²konnektordimension och BB7 med 7 mm² konnektordimension placerades i BodyLayer 2 och Body Layer 3 (med 1100 MPa böjhållfasthet för respektive lager) idisken. Broarna genomgick termocykling, 10 000 cykler. Därefter valdes fyrabroar slumpmässigt ut, en bro från varje grupp, och cementerades på modell.Slutligen genomfördes ett brotthållfasthetstest med en universaltestmaskin tillsfraktur uppstod. Resultatet sammanställdes och redovisades deskriptivt. Resultat: Bron i grupp BB12 förblev intakt och fraktur skedde enbart i modellen(893N). Bron i grupp BB7 visade högst brotthållfasthet: 972N, följt av bron igrupp EB12 som visade brotthållfasthet på 842N och bron i grupp EB7 påvisadeden lägsta brotthållfastheten: 465N. Dessa tre broar frakturerade mesialt på dethängande ledet. Slutsats: Inom ramen för föreliggande pilotstudies begränsningar kan följandeslutsatser dras: brotthållfastheten på monolitiska broar i flerskiktad zirkoniapåverkas av konnektordimensioneringen. Placering av broar med mindrekonnektorarea än rekommendationen ska undvikas i skikten med lägre hållfasthet.Valet av modellmaterial har betydelse och påverkar resultatet.

No description available.

Yes / This paper presents an experimental study on an innovative composite floor system that can be demounted and deconstructed. In this system, the composite slab, formed with profiled metal decking, was connected to a steel beam via demountable shear connectors. A full-scale demountable composite floor system specimen was tested to ultimate load bearing capacity and compared with a similar non-demountable composite floor system specimen using conventional welded headed stud connectors. The experimental results and observations showed that the structural behaviour and load bearing capacity of both composite floor systems are very similar. However, the composite floor system with demountable shear connectors could be deconstructed after testing and the composite slab could be easily detached from the steel beam. The comparison and analysis presented in this paper indicated that the simple design methods currently provided in the Eurocode 4 for the welded shear connections could be used to assess the ultimate moment capacity of demountable composite floor systems.

Köldbryggor innebär att en del av klimatskalet har en högre värmegenomgång än övriga delar av skalet, vilket är ett problem som ingenjörerna stöter på i varje projekt. Värmeläckage kan minimeras med hjälp av ett isolerande skikt mellan betongplattan och bjälklaget. Idag beräknas inte köldbryggan som orsakas av balkonganslutningen, utan ingår i ett påslag på 30% av den totala transmissionsförlust av byggnaden. Detta leder oss till arbetets syfte som är att undersöka varför det inte är en norm att beräkna köldbryggorna som förekommer vid balkonganslutningar.  En empirisk undersökning genomfördes med byggföretagen i Sverige, främst Skåne. Intervjun riktades till konstruktörer, energispecialister, platschefer och arbetsledare, totalt deltagande av intervjuer blev 9 varav ett företag svarade genom enkät. Utifrån intervjuerna framgick det att de två mest använda balkong typerna är den traditionella metoden där balkongen fäst genom betongklackar och balkonger som fäst genom köldbryggebrytande isolering modul.  Med hjälp av olika datorprogram kommer ovannämnda balkongtyper användas som referensobjekt där köldbryggor beräknas för att undersöka vilka faktorer och svårigheter som finns vid sådana beräkningar. Balkonger med betongklackar beräknades att ha ett värde mellan 0.4 W/mK till 1.0 W/mK medan balkonger med isoleringsmoduler beräknades till 0.023 W/mK - 0.067 W/mK, detta betyder att den traditionella klack-metoden inte håller värme lika bra som balkonger som är fästa med hjälp av isoleringsmoduler. Under beräkningar visade sig att det finns många faktorer som påverkar köldbryggor med avseende på balkonganslutningen. Exempelvis väggens innehåll, antal fönster, placering av fönster och balkongdörrar, balkongens utformning och i vissa fall är armeringensmängden okänd under planeringsfasen. Alla dessa faktorer varierar från projekt till projekt och gör det väldigt komplicerat att skapa en standardlösning som passar till varje enstaka fall. Utöver dessa faktorer så har det varit bristfälliga anvisningar på hur köldbryggor ska beräknas, detta påvisades genom att många företag som intervjuades utförde sina beräkningar på olika sätt.  Slutsatsen är att på grund av alla faktorer och svårigheter samt lågt krav på redovisning av köldbryggor i byggnader, så finns det ingen riktig anledning till att utföra så tidskrävande beräkningar under förutsättning att projektet inte syftar till forskning. Däremot tror vi att detta kommer att förändras med tiden eftersom miljön blir allt viktigare med tiden, troligtvis kommer detta leda till striktare krav gällande redovisning av köldbryggor. / Thermal bridging is the movement of heat across an object that is more conductive than other surrounding materials, which is a common problem that engineers encounter in every project. The heat leakage can be reduced by using insulation between the concrete slab and the joist. Today, the thermal bridging caused by the balcony connectors is not calculated but is included in a 30% lump sum of the total transmission losses of the building. This leads us to the purpose of the work, which is to investigate why it is not a norm to calculate the thermal bridges that occur at balcony connectors. To investigate this, an empirical survey was carried out with construction companies in Sweden, mainly Skåne. The interview was directed to engineers, energy specialists, site managers and supervisors. In total there were nine participants in the interviews and one that responded to the survey. Based on the interviews, it emerged that the two most used balcony types are the traditional method where the balcony is attached through concrete slab and joist and balconies which are attached through an insulated balcony connector. With the help of various software, thermal bridge calculations are performed to investigate factors and difficulties with the balcony connectors. Balconies with concrete slabs were calculated to have a value between 0.4 W/mK to 1.0 W/mK while balconies with insulation modules were calculated to be 0.023 W/mK to 0.067 W/mK, this means that the traditional slab method does not retain heat as well as balconies connectors with insulation modules.  The conclusion is that there is little to no reason to calculate such time-demanding calculations due to all the factors and complications. Though we believe that this will change in the future with time as the environment becomes increasingly important over time, this will probably lead to stricter requirements regarding the report of thermal bridges from Boverket.

With the advance of reliable network technology, software development has progressed from traditional, platform-centric software construction to network-centric software evolution. An evidence of this change is largely reflected in the technologies that are supporting the emerging theory of Network-Centric Operations (NCO). Amongst these technologies is software architecture as a software engineering sub-discipline. Although the concepts of network centricity are widely recognized within the software and system engineering communities, no unified characterization of network-centric software systems is unanimously adopted. The state-of-the-practice is characterized by differing interpretations about how we should design and implement this class of systems. In this research, our focus is twofold: 1) Providing a characterization framework to reason about network-centric software systems and 2) introducing one solution approach to designing this class of system based on a new architectural style, the network-centric architectural style. In so doing, we set the stage for the software architecture community to analyze the "fitness of use" of current architectural styles and architecture design practices within this new network-centric paradigm. In addition, we set the stage for our continued research that will address further software engineering challenges pertinent to network-centric software systems, which include capability-based requirements engineering and quality attributes-based design. / Master of Science

Notched stringer segments spliced with metal connector plates (MCPs) and pallets with spliced stringer(s) were tested in static bending in order to determine the relative effectiveness of different stringer splicing methods and under what conditions the process is or is not effective. The species tested were oak, southern yellow pine, yellow-poplar, and two combined species - oak and yellow-poplar, and oak and southern yellow pine. The metal connector plates used were 3 x 4-inch, 3 x 6-inch truss plates, and a 3 x 4-inch plug plate. The splice methods tested were a vertical splice (VS), a 45° angle splice (AS), and a vertical splice with -inch gap between segments (VSG). The results of bending tests of these specimens were compared to non-spliced whole stringers and pallets containing whole stringers. Multiple comparison, statistical methods were used to analyze all test data. An analysis of the failure locations and types of specimens was also used to analyze test results. Vertical spliced stringers with 3 x 4 and 3 x 6 inch truss plates were the best designs of those tested. Spliced stringers were an average of 112% and 74% bending strength and stiffness of new non-spliced stringer. These plates were an average of 26% stronger and 13% stiffer than the 3 x 4 inch plug plate splice stringer. There was no difference between the performance stringers spliced with 3 x 6 and 3 x 4 inch truss plate. An angle splice design and the addition of 1.25 x 6 inch truss plate on the tension side of spliced stringer did not appear to improve the strength and stiffness. A gap between segments significantly reduces splice strength and stiffness by an average of 35% and 16% respectively. When mixing stringer segment species, the performance is determined by the weaker segment. The average strength and stiffness of pallets containing spliced stringers were similar to that of pallets with whole stringers, however the variation in performance was greater when notched stringer pallets contain splices. / Master of Science

This thesis describes design and experimental verification of three types of the wideband antenna Bow-tie antenna, Vivaldi antenna and Spiral antenna. The tracked parameters are bandwidth, input impedance, gain and directivity patterns. Next step is design of millimeter-wave horn antennas. Attention is turned to the proper construction of a wideband feeder of the horn. For the final antenna structure, a bow-tie dipole and a Vivaldi antenna were chosen. The antenna construction is aimed to provide a wide bandwidth on one hand and a high gain on the other hand.