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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Model and design of small compact dielectric resonator and printed antennas for wireless communications applications : model and simulation of dialectric resonator (DR) and printed antennas for wireless applications : investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies

Elmegri, Fauzi O. M. January 2015 (has links)
Dielectric resonator antenna (DRA) technologies are applicable to a wide variety of mobile wireless communication systems. The principal energy loss mechanism for this type of antenna is the dielectric loss, and then using modern ceramic materials, this may be very low. These antennas are typically of small size, with a high radiation efficiency, often above 95%; they deliver wide bandwidths, and possess a high power handling capability. The principal objectives of this thesis are to investigate and design DRA for low profile personal and nomadic communications applications for a wide variety of spectrum requirements: including DCS, PCS, UMTS, WLAN, UWB applications. X-band and part of Ku band applications are also considered. General and specific techniques for bandwidth expansion, diversity performance and balanced operation have been investigated through detailed simulation models, and physical prototyping. The first major design to be realized is a new broadband DRA operating from 1.15GHz to 6GHz, which has the potential to cover most of the existing mobile service bands. This antenna design employs a printed crescent shaped monopole, and a defected cylindrical DRA. The broad impedance bandwidth of this antenna is achieved by loading the crescent shaped radiator of the monopole with a ceramic material with a permittivity of 81. The antenna volume is 57.0  37.5  5.8 mm3, which in conjunction with the general performance parameters makes this antenna a potential candidate for mobile handset applications. The next class of antenna to be discussed is a novel offset slot-fed broadband DRA assembly. The optimised structure consists of two asymmetrically located cylindrical DRA, with a rectangular slot feed mechanism. Initially, designed for the frequency range from 9GHz to 12GHz, it was found that further spectral improvements were possible, leading to coverage from 8.5GHz to 17GHz. Finally, a new low cost dual-segmented S-slot coupled dielectric resonator antenna design is proposed for wideband applications in the X-band region, covering 7.66GHz to 11.2GHz bandwidth. The effective antenna volume is 30.0 x 25.0 x 0.8 mm3. The DR segments may be located on the same side, or on opposite sides, of the substrate. The end of these configurations results in an improved diversity performance.
22

Är bostäder en Mänsklig Rättighet? : En kvalitativ undersökning om gentrifieringsprocesser och segregation i Halmstad / Is Housing a Human Right? : A qualitative study on gentrification processes and segregation in Halmstad

Paula, Klenze, Jenny, Malmberg January 2020 (has links)
The implementation of the 2030 Agenda in Sweden has involved a reorganization of municipalities such as Halmstad through the creation of documents and strategic plans that serve as a guide to counteract the processes of gentrification and segregation. The Municipality of Halmstad is working to break the segregation, but the need to create an image of Halmstad as an attractive and interesting city to live and invest in does not consider a direct risk of creating further segregation through gentrification. Thus, the municipality fights segregation by targeting vulnerable risk areas without working simultaneously with voluntary segregation in the prosperous westernpart of the city by involving the entire city of Halmstad in this inclusion process. On the other hand, we see a low democratic participation by the poorest part of the city and more the participation of experts and private actors in making important decisions involving housing in Halmstad. We see a lack of trust on the part of citizens to political institutions and to authorities in general and this is a result of a deficiency that Fainstein calls justice, representation and equity.
23

Model and design of small compact dielectric resonator and printed antennas for wireless communications applications. Model and simulation of dialectric resonator (DR) and printed antennas for wireless applications; investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies

Elmegri, Fauzi January 2015 (has links)
Dielectric resonator antenna (DRA) technologies are applicable to a wide variety of mobile wireless communication systems. The principal energy loss mechanism for this type of antenna is the dielectric loss, and then using modern ceramic materials, this may be very low. These antennas are typically of small size, with a high radiation efficiency, often above 95%; they deliver wide bandwidths, and possess a high power handling capability. The principal objectives of this thesis are to investigate and design DRA for low profile personal and nomadic communications applications for a wide variety of spectrum requirements: including DCS, PCS, UMTS, WLAN, UWB applications. X-band and part of Ku band applications are also considered. General and specific techniques for bandwidth expansion, diversity performance and balanced operation have been investigated through detailed simulation models, and physical prototyping. The first major design to be realized is a new broadband DRA operating from 1.15GHz to 6GHz, which has the potential to cover most of the existing mobile service bands. This antenna design employs a printed crescent shaped monopole, and a defected cylindrical DRA. The broad impedance bandwidth of this antenna is achieved by loading the crescent shaped radiator of the monopole with a ceramic material with a permittivity of 81. The antenna volume is 57.0  37.5  5.8 mm3, which in conjunction with the general performance parameters makes this antenna a potential candidate for mobile handset applications. The next class of antenna to be discussed is a novel offset slot-fed broadband DRA assembly. The optimised structure consists of two asymmetrically located cylindrical DRA, with a rectangular slot feed mechanism. Initially, designed for the frequency range from 9GHz to 12GHz, it was found that further spectral improvements were possible, leading to coverage from 8.5GHz to 17GHz. Finally, a new low cost dual-segmented S-slot coupled dielectric resonator antenna design is proposed for wideband applications in the X-band region, covering 7.66GHz to 11.2GHz bandwidth. The effective antenna volume is 30.0 x 25.0 x 0.8 mm3. The DR segments may be located on the same side, or on opposite sides, of the substrate. The end of these configurations results in an improved diversity performance. / General Secretariat of Education and Scientific Research Libya
24

Sustainable Stakeholder Framework for Hotels : Supporting Sustainable Tourism Management in Vlora, Albania / Intressentramverk för hotell : hållbar turism i Vlora, Albanien

Berggren Ek, Alma, Espling, Ella January 2021 (has links)
This study aims to create a sustainable tourism stakeholder framework for hotels in Vlora, a popular tourist destination in southeast European country Albania. As tourism is one of the major driving forces towards better social and economical conditions in Albania but simultaneously poses threats towards nearby ecosystems and protected areas, local traditions and cultures and small suppliers, the importance of sustainability in the industry has risen as a top priority. Conducted on behalf of UNDP Albania, the stakeholder framework aims to function as an outline for a sustainable management plan, leading to future eco-certi cation for hotels. The stakeholder framework, which includes  five-key stakeholder categories; operational, employees, clients, suppliers and local community, each with well tested CSR-practices linked to them, aims to promote sustainable development for the entire destination. The hotel, placed in the center, isused as a driving force towards closer collaborations with other stakeholder categories. The framework was tested on Vlora's largest hotel actor, Regina Hotel Group, through a questionnaire and interviews with four top management executives. The key findings show that Regina Hotel Group has come far in their social sustainability, in particular regarding employees and local suppliers, but lack in sustainability training, leading to lower awareness and sustainability mainly being implemented for financial reasons. Lastly, a recommendation with examples of short- and long-term implementations is presented for the hotel, connected to each stakeholder category. / Denna studie kommer att undersoka hållbar turism i den populära turistdestinationen Vlora, i södra Albanien. Turism är en av två näringar som bidrar mest till socioekonomisk utveckling i regionen. Samtidigt kan alltför stor och oreglerad turistindustri hota bevarandet av omkringliggande natur, kultur, traditioner och små, lokala företag. Med detta i åtanke är hållbarhet en viktig aspekt för Vloras framtida turiststrategi. Genomförd på uppdrag av FN:s utvecklingsprogram, UNDP Albania, tar studien fram ett intressentramverk, som ska ligga till grund för ett eko-certiferingssystem för FN:sutvecklingsprogram. Fem kategorier av nyckelintressenter, teknik, anställda, kunder, leverantörer och lokalsamhälle, har intressentramverkets kopplat CSR-praktiker (Corporate Social Responsability), väl testade för hotells hållbarhet, till. Ramverket använder sedan hotellet, placerat i mitten, som drivkraft för att främja hållbar utveckling i hela destinationen. Genom ett frågeformulär och uppföljande intervjuer med fyra chefer från Vloras största hotellaktör, Regina Hotel Group, kristalliserades fem huvudslutsatser. Först, Regina Hotel Group har kommit låangt i sitt sociala hållbarhetsarbete, speciellt vad gäller anställda och lokala leverantörer, men de saknar utbildning i hållbarhet, vilket leder till låg medvetenhet och därför implementeras hållbara lösningar genom finansiella argument. Avslutningsvis, presenteras en rekommendation med exempel på kort- och långsiktiga lösningar som är kopplade till varje intressentkategori.
25

Vad visar den plan som säger mer än tusen ord? : Illustrationsplanens betydelse utifrån tydlighetskravet i Plan- och Bygglagen

Söder, Tove, Eliasson, Erika January 2021 (has links)
Studien syftar till att undersöka illustrationsplaners betydelse som ett förtydligande dokument till detaljplanen, samt i vilken utsträckning illustrationsplaner uppfyller tydlighetskravet i 4 kap 32 och 33 § § Plan- och bygglagen (PBL). Studien har framtagits med avsikt att uppmärksamma en problematik vars effekter kan påverka det faktiska medborgarinflytandet. En brist på forskning har observerats inom ämnet och studien avser därför bidra till att fylla den kunskapsluckan i samhällsplaneringen.  Tydlighetskravet innebär att detaljplanens regleringar tydligt ska redovisas för att säkerställa medborgarnas förståelse för planens innebörd och konsekvenser. I avsikt att uppnå tydlighetskravet används ofta illustrationsplaner som kommunikationsverktyg för att förmedla detaljplanens syfte och planbestämmelser till allmänheten. Detta beror på att detaljplanen ofta kan upplevas svårtydd eftersom detaljplankartans utformning tydligt skiljer sig från hur kartor brukar illustreras i andra sammanhang. Genom kvalitativ innehållsanalys ämnar undersökningen besvara i vilken utsträckning illustrationsplaner uppfyller tydlighetskravet i PBL. Vid undersökningen jämfördes detaljplanekarta och planbestämmelser med tillhörande illustrationsplan för att gradera hur tydliga illustrationsplaner är. Detta genomfördes genom ett antal uppställda påståenden som illustrationsplanen kunde svara mot. Påståendena baseras bland annat på tidigare domslut kring illustrationer samt semiotikens syn på hur bilder kan tolkas. Undersökningen kompletterades med ett antal intervjuer från branschkunniga personer, detta för att få en mer kvalitativ och djupgående förståelse för resultatet samt illustrationsplaners betydelse som kommunikativt verktyg. Undersökningens resultat visar på en bristfällighet hos de undersökta illustrationsplanerna vad gäller tydlighet. Svårtolkade illustrationsplaner försvårar medborgarens möjligheter att uppfatta detaljplanens konsekvenser och deras möjlighet att lämna relevanta synpunkter under planprocessen minskar därmed ytterligare. Denna syn på illustrationsplanens potentiella konsekvenser delades med de personer som intervjuades i samband med studien.  Med undersökningen och intervjuerna som grund har ett antal ställningstaganden och förslag sammanställts som anses inneha praktisk relevans för samhällsplaneringen. Ett exempel på detta är att en mer gedigen vägledning bör tas fram, till förmån för en nationellt enhetligare användning av illustrationer. Vägledningen hade kunnat utformas på olika sätt, bland annat genom att bristfälliga planer sammanställs för att påvisa vilka konsekvenser som kan följa av en otydlig illustrationsplan. Därtill har även annan typ av vägledning samt andra förslag lyfts fram i studiens slutsatser.

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