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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.
11

Ögon och öron i främmande land : En studie av utrikeskorrespondenter och deras arbete i svensk dagspress

Eidmark, Lina January 2006 (has links)
Det här är en studie om svenska utrikeskorrespondenter. Utrikeskorrespondenter ger kanske ofta den bästa rapporteringen men blir allt färre i takt med att medieföretagen sparar. Samtidigt borde behovet av utrikesnyheter öka i en globaliserad värld. Uppsatsens syfte är att få bättre kännedom kring hur de svenska reportrar som arbetar utomlands själva ser på sitt arbete och genom en skissartad undersökning se hur utrikesnyheterna förändrats under en novembervecka 1975, 1985, 1995 och 2005. Jag har gjort kvalitativa intervjuer med fyra svenska utrikeskorrespondenter och en kvantitativ skissundersökning av utrikesnyheterna i Aftonbladet, Expressen, Svenska Dagbladet och Dagens Nyheter. Resultatet av de kvalitativa intervjuerna visar att de utrikeskorrespondenter som deltog i studien tycker att det finns mycket att vinna med deras arbete; större självständighet i nyhetsvärdering, högre textmässig kvalitet och personligt berättande är några exempel. Samtidigt visar det kvantitativa stickprovet att de egna utrikesnyheterna och korrespondenterna blir färre. I kvällspressen består utrikesnyheterna i dag nästan bara av omskrivna och översatta utländska artiklar och i dagspressen har antalet utrikesnyheter minskat till följd av omläggningen till tabloid-format. En av slutsatserna i arbetet är att begreppet utrikeskorrespondent kan vidgas och innefatta många olika källor som ger upphov till utrikesnyheter.
12

Study of delamination of composite hat skin stringer interface failure

Rajamanickam, Rajkumar January 2019 (has links)
The use of composite materials brought a tremendous breakthrough in the scientific world of aerospace engineering. The lack of understanding of the failure of composite materials can be disastrous. Composite laminated structures need to be thoroughly studied and investigated in the design stage. In this thesis, formed-hat skin stringer made of composite laminates is investigated. Delamination is the most common failure of laminated composites, which has two stages delamination onset and delamination propagation. In the preliminary design phase, firstly the structures need to be investigated for low-velocity impact to check the formation of damage onset due to the impact that may arise during manufacturing. In the detailed design phase, the structure is investigated to study the evolution of delamination growth under loading conditions. The structure is modeled using 3 D elements because of the presence of Interlaminar stresses in the width and thickness direction and anisotropic nature. In this thesis, more emphasis is given on the interface between the skin and the stringer. The debonding effect of the interface is studied using cohesive zone model(CZM).
13

Effects of Green Tree Retention on Birds of Southern Pine Plantations

Parrish, Michael Clay 14 December 2018 (has links)
In the southern United States, institutional forest owners engaged in forest certification programs often retain unharvested or less-intensively harvested vegetation when clearcut harvesting intensively managed pine (Pinus spp.) forests (“IMPFs”), a practice called ‘green tree retention’. I investigated resultant patterns of land cover and retained structural elements in recently-harvested IMPF management units (“MUs”) and related them to avian biodiversity to provide information to support harvest decisions. First, to provide forest managers baseline data on retention, I screen-digitized land cover on 1187 MUs (totaling 51646 ha) and characterized green tree retention levels and internal land cover attributes (Chapter 2). I found MU land cover was dominated by regenerating clearcuts (mean: 80.5%), streamside management zones (“SMZs”; vegetated buffers surrounding intermittent and perennial streams; 14.0%) and stringers (buffers surrounding ephemeral streams; 3.3%). Next, I surveyed 60 MUs for vegetation stem density and cover (Chapter 3). Concurrently, I surveyed avian community density and richness (Chapter 4). Vegetation and avian metrics were compared and contrasted across the dominant cover types (with emphasis on stringer/SMZ similarity) to understand impacts of retained structural elements on biodiversity outcomes. I found that snag and log density, midstory pine density, understory deciduous cover, and ground cover were not different in stringers and SMZs; however, overstory (pine and deciduous) and midstory (deciduous) tree density was lower in stringers than in SMZs, and understory pine density was greater in SMZs. Species overlap between cover types was high (74% to 84%), but SMZs and stringers provided 27% of MU species richness. Stringers appeared to benefit both shrubland- and forest-associated birds. Finally, I sampled land cover across 4450 sq-km surrounding the 60 MUs, and performed ordination analyses to identify associations between local-scale (MU interiors) and landscape-scale (3-km buffers around MUs) land cover and avian guild diversity (Chapter 5). I found the region to be >90% forested. Cover type data explained 41% of the partial variation in avian density and total species richness. Local-scale MU characteristics appeared more important than landscape-scale characteristics in explaining avian biodiversity responses. My results suggest that retained structural features support and enhance MU biodiversity in harvested IMPFs.
14

Víceůčelové obchodní centrum ve Vsetíně / The multipurpose shopping centre in Vsetín

Mužná, Alena January 2013 (has links)
Objective of the work is desingning the steel structure of multipurpose shopping centre. Structure is in two sections, structure A has two floors and structure B is ground floor. The main bearing components are the traversal restrained columns and the strut-frame stringers and traverse frames. Frame stringers are after the the axial distance 15 m. Ceiling are designed as a composite. The purlins are plate and trusses. The structure is desingned for the distrikt of east Morava.
15

LOAD RATING – DEVIATION OF LRFR METHODOLOGY FOR INDOT STEEL BRIDGES

Prekshi Khanna (11178363) 26 July 2021 (has links)
<div>The design of bridges prior to 1994 was carried out by either the Load Factor Design (LFD) or the Allowable Stress Design (ASD) methodologies. Load rating of these bridges was primarily conducted by Load Factor Rating (LFR). In 1994, the American Association of State Highway and Transportation Officials (AASHTO) developed and encouraged the use of a probabilistic-based method titled Load and Resistance Factor Design (LRFD) for carrying out bridge design. A new methodology consistent with LRFD was also developed and adopted for conducting load rating. Thus, a new Load and Resistance Factor Rating (LRFR) was adopted by AASHTO in 2001 for load rating. Today, the bridges that were designed by the old LFD methodology are rated by both LFR and LRFR. Continued development suggests that load rating in future will be based only on LRFR, therefore LRFR is the recommended method for carrying out load rating of bridges even if they were designed by LFD. </div><div><br></div><div>The Indiana Department of Transportation (INDOT) came across some LFD designed bridges which were adequate by LFR methodology, i.e., produced a rating factor of more than 1.0, but inadequate for LRFR. The load ratings were carried out using AASHTOWare Bridge Rating (BrR) software. These bridges belonged to five different limit states: lateral torsional buckling, changes in cross-section along the member length, tight stringer spacings, girder end shear and moment over continuous piers. </div><div><br></div><div>This research study explores the inherent differences between LFR and LRFR to justify the inconsistencies in the rating values. To find an explanation for these discrepancies, load ratings of these bridges were carried out extensively on AASHTOWare BrR. To verify the results produced by BrR, a separate analysis was also conducted using Mathcad and structural analysis results from SAP2000 for comparison purposes. Finally, the study also recommends some modifications in the BrR software that can be adopted for each of the above-mentioned limit states to resolve inconsistencies found between LFR and LRFR rating values. </div><div><br></div>
16

Návrh rekonstrukce dřevěných konstrukcí stávajícího objektu / The reconstruction design of timber structures of the existing building

Bartlová, Jana January 2015 (has links)
The content of this work was to carry out construction-technical survey of timber structures of the existing building in order to design an appropriate procedure for their reconstruction. The survey showed construction in an unsatisfactory to disrepair, so further work also includes the static calculation of new structures proposed instead of the current. Timber structure in the building has form of staircase, roof and ceiling construction. Newly designed the following types of stairs and roof trusses from which the lower belts are used as ceiling beams. The new proposal also includes possible roofing, roofing options, developed one of them. The work also includes drawings, bill of materials and cost estimate staircase structure and truss. Specialization in the field of civil engineering is represented by drawings of the new truss and passport (view of current state) whole object on parcel ST.74 / 1, land Tišnov (okr.Brno-venkov), the content of which was the basis for this work.

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