Дисертації з теми "Wadeye"
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1
Kernan, Luke James Leo. "Narrative, myth and cultural resource management in Wadeye, Northern Territory, Australia : a preliminary study." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51009.
Повний текст джерелаАнотація:
Cultural resource management is an effort to revitalize culture in the present, and the aim of such endeavours is to provide stability for future generations in navigating culture. This theme runs throughout my preliminary fieldwork in Wadeye, as I sought to collect traditional narratives of the mythic “Dreaming” song cycles. One of the goals of my volunteering and fieldwork in this region was to help make history relevant to future generations of Aboriginal Australians by providing them with resources from the local Kanamkek-Yile Ngala museum. In this thesis, I explore how culture as presented in traditional myths and narratives becomes intertwined in the daily lives of Aboriginal Australians. The thesis delves heavily into the process of fieldwork as a way of engendering empathy for the social analysis of myths. The experience of the field, entering into another way of life, is central in forming an understanding for how myth and narrative play vital roles in Aboriginal Australian culture. The fieldwork here is largely from the vein of applied anthropology in seeking answers relating to the loss of narratives in the region. The drive here is to find a framework for the successful revitalization of lost stories by visiting cultural sites and reconnecting to experiences of the land. I also explore notions of ethno-poetry as a possible way of tapping into the creative potential of the Aboriginal Australian “Dreamtime.” The aim is thus to engender larger discussion in cultural resource management by centering the community in deciding its own responses and adaptation strategies in dealing with story revitalization efforts.Graduate Studies, College of (Okanagan)
Graduate
2
Furlan, Alberto. "Songs of continuity and change : the reproduction of Aboriginal culture through traditional and popular music." Thesis, University of Sydney, 2005. http://hdl.handle.net/2123/1333.
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Goldman, Gerard Mark. ""Remembering - Ian, Alan Goldman, and Memela" using narrative as an approach to Aboriginal reconciliation in Australia /." Theological Research Exchange Network (TREN), 1999. http://www.tren.com.
Повний текст джерелаАнотація:
Thesis (D. Min.)--Catholic Theological Union at Chicago, 1999.Abstract and vita. "The specific purpose of this thesis-project is to examine whether narrative (storytelling and storylistening) can be a significant tool in bringing about reconciliation between Aborigines, Anglo-Australian missionaries and other persons in the Wadeye local church, Northern Territory, Australia"--Introd. Includes bibliographical references (leaves 301-320).
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Vahl, Wouter Karsten. "Interference competition among foraging waders." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/297672886.
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Rönkä, N. (Nelli). "Phylogeography and conservation genetics of waders." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211633.
Повний текст джерелаАнотація:
Abstract Many waders are in decline, and the number of endangered species and populations is increasing. Their protection and management requires knowledge of both ecological and genetic state of the populations. In this thesis, I studied the distribution-wide genetic variation, structure and phylogeography of the Temminck’s Stint (Calidris temminckii) and Terek Sandpiper (Xenus cinereus) using microsatellites and sequence data from the mitochondrial control region and cytochrome oxidase I gene. I compared these regionally endangered species to other waders with varying evolutionary histories, breeding systems and habitat preferences to examine the levels of genetic variation and structure at different spatial scales. In addition, I studied the genetic structure of the endangered Baltic population of the Southern Dunlin (Calidris alpina schinzii) with microsatellites. I used genetic information in all three study species to determine units for conservation. The Temminck’s Stint and Terek Sandpiper, both not restricted to the Arctic, had low distribution-wide structuring. They also had quite low levels of variation when compared to other species breeding at similar latitudes, indicating reductions in population sizes during past climate changes. Especially the peripheral breeding populations were differentiated and showed signs of inbreeding and genetic drift when compared to the main range. The Temminck’s Stint populations at the Bothnian Bay and Yakutia, and Terek Sandpiper populations in Finland and Belarus, should be treated as separate management units. The broader interspecific comparison of waders suggests that habitat availability, mating system and the extent of philopatry may affect the genetic composition of species. The genetic analyses of the Southern Dunlin indicated strong effects of philopatry and inbreeding throughout the range. Local subpopulations at the Bothnian Bay and in Sweden need to be considered as separate management units. Management efforts at the Baltic should be focused on increasing connectivity and providing large enough breeding habitats for potential immigrants and recruitsTiivistelmä Useat kahlaajapopulaatiot ovat pienentyneet ja uhanalaistuneet maailmanlaajuisesti. Lajien ja populaatioiden ekologiaa ja genetiikkaa on tunnettava, jotta suojelutoimia voidaan kohdistaa oikein. Tutkin väitöskirjassani lapinsirrin (Calidris temminckii) ja rantakurvin (Xenus cinereus) geneettistä rakennetta, muuntelua ja fylogeografiaa levinneisyysalueen laajuisesti mikrosatelliittien ja mitokondrion kontrollialueen ja sytokromioksidaasi I -geenin sekvenssien avulla. Tutkin, mitkä tekijät vaikuttavat geneettisen rakenteeseen ja muunteluun vertaamalla näitä lajeja muihin kahlaajiin, joilla on erilaisia lisääntymisstrategioita, jotka pesivät vaihtelevissa ympäristöissä ja joista monet eroavat toisistaan myös fylogeografialtaan. Lisäksi tutkin Itämeren rannalla pesivän etelänsuosirrin (Calidris alpina schinzii) geneettistä populaatiorakennetta mikrosatelliittien avulla. Käytin geneettistä tietoa hyväksi luonnonsuojeluyksikköjen määrittämisessä kaikille kolmelle tutkimuslajilleni. Lapinsirrin ja rantakurvin fylogeografinen historia oli samankaltainen. Geneettisen muuntelun määrä oli vähäisempää verrattuna muihin, samankaltaisissa ympäristöissä pesiviin kahlaajiin. Molemmat lajit ovat todennäköisesti kärsineet historiallisten ilmaston-muutosten aiheuttamasta populaatioiden pienenemisestä. Erityisesti levinneisyysalueen reunoilla pesivät populaatiot olivat erilaistuneita, ja niissä näkyi sukusiitoksen ja geneettisen satunnaisajautumisen merkkejä. Perämeren ja Jakutian lapinsirri- sekä Valko-Venäjän ja Suomen rantakurvipopulaatioita tulee kohdella erillisinä suojeluyksiköinään. Vertailu muihin kahlaajiin osoitti, että niin pesimä- ja talvehtimisalueiden laajuus kuin lisääntymisstrategiat ja paikkauskollisuus voivat vaikuttaa lajien geneettiseen koostumukseen. Etelänsuosirrin geneettiset analyysit paljastivat merkkejä sukusiitoksesta, joita paikkauskollisuus ja populaatioiden pienuus ovat voimistaneet. Perämeren ja Ruotsin populaatioita tulee kohdella erillisinä suojeluyksiköinään. Suojelutoimet on kohdistettava tarpeeksi suurien, hyvälaatuisten pesimäpaikkaverkostojen ylläpitämiseen
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Small, Cleo Jane. "Waders, habitats and landscape in the Pennine Dales." Thesis, Lancaster University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414889.
Повний текст джерела
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Fournier, Kevin. "The Wadge Hierarchy : Beyond Borel Sets." Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC005.
Повний текст джерелаАнотація:
Cette thèse est dévolue à l'étude des sous-ensembles Ale non-boréliens de l'espace de Baire. Dans une première partie, nous généralisons les résultats obtenus par Duparc et Louveau pour obtenir une description complète de la hiérarchie de Wadge des différences croissantes d'ensembles coanalytiques, sous l'hypothèse que tous les ensembles analytiques sont déterminés. Ensuite, nous étudions certaines classes incluses dans la classe A1/2, les classes de Selivanovski et celles de Kolmogorov, et donnons un fragment de leur hiérarchie de Wadge. Finalement, nous appliquons les techniques et résultats obtenus à l'informatique théorique, et plus précisément à la théorie des automates d'arbresThis thesis is devoted to the study of non-Borel Al2 pointclasses of the Baire space, using reductions by continuous functions. This work is divided in three main parts. In the first one, we generalise results obtained by Duparc and Louveau to provide a complete description of the • Wadge hierarchy of the class of increasing differences of coanalytic sets, under some determinacy hypothesis. In a second part, we study some Al2 pointclasses above the class of increasing differences of coanalytic sets, and give a fragment of the Wadge hierarchy for those classes. Finally, we apply our results and techniques to theoretical computer science and more precisely to the study of regular tree languages, that is sets of labeled binary trees that are recognized by tree automata
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Bradter, Ute. "The distribution of upland breeding waders at multiple spatial scales." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550525.
Повний текст джерелаАнотація:
Species distribution models are a valuable tool in conservation and research. This thesis addressed three common constraints of such models: the lack of detailed vegetation data for large areas. the inclusion of variables at arbitrary spatial scales which can lead to wrong conclusions as processes are scale dependent. 3) the potentially large number of variables and associated problems in variable selection when models include the landscape context. A novel technique combining a multiple scale species distribution model with image interpretation classified 24 detailed vegetation communities and an additional class for trees and bushes of the Yorkshire Dales at a high resolution (5 m) with overall high accuracies (87 - 92%). A novel selection procedure was developed capable of selecting important variables at appropriate spatial scales from a large number of variables. Models were presented on the example of curlew (Numenius arquata) and lapwing (Vanellus vanellus) in the Yorkshire Dales. Predictive ability of most resulting • models was moderate to high (AUC = 0.84 - 0.97). Lapwing presence was positively associated with gentle slopes and negatively with soil of low fertility at a large scale (10 km) while locally (250 - 500 m) lapwing preferred soil with impeded drainage and acid grassland. Curlew presence was negatively associated with westerly facing slope and curlew density positively with south facing slope (above a threshold of 14%) at large scales (9 - 10 km). Curlew presence was negatively associated with freely draining soil and settlements and positively with bogs at small scales (250 - 750 m). Near paths, density of curlew was higher if less of the path was in view at a small scale (250 m). Hatching success of curlew was strongly negatively related with settlements within 1 km. At nests, curlew preferred vegetation of intermediate height (ea. 40 cm).
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Davis, Regina C. "Journeys a critical analysis of the diary of Sarah L. Wadley /." Huntington, WV : [Marshall University Libraries], 2002. http://www.marshall.edu/etd/descript.asp?ref=176.
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Lecomte, Dominique. "Classes de Wadge potentielles et théorèmes d'uniformisation partielle." Paris 6, 1993. http://www.theses.fr/1993PA066591.
Повний текст джерелаАнотація:
Lors de l'étude des relations d'équivalence borélienne, le problème suivant apparaît: peut-on diminuer la complexité d'un borélien d'un produit de deux espaces polonais en enrichissant les topologies sur chacun des facteurs ? D'où l'introduction de la notion de classe de Wadge potentielle. On cherche à savoir si certains résultats vrais pour les classes de Wadge peuvent être adaptés aux classes de Wadge potentielles. En l'occurrence, il s'agit d'une part de voir si cette notion correspond à une réduction, comme dans le cas des classes de Wadge classiques, et on verra que non. On cherchera ensuite à̀ savoir si on peut obtenir des résultats de type Hurewicz, c'est à dire: Ne pas être d'une classe donnée, c'est être au moins aussi compliqué que des exemples de référence n'étant pas de cette classe. On obtiendra des résultats partiels pour les petites classes de Wadge (notamment, on caractérisera les boréliens potentiellement fermes parmi les boréliens à coupes dénombrables, à l'aide d'ensembles localement a projections ouvertes). Ceci nous amènera à des résultats d'uniformisation, pour des ensembles à coupes maigres, à coupes non maigres, des intersections dénombrables d'ouverts denses, et des intersections dénombrables d'ouverts, localement à projections ouvertes. En étudiant les limites de ces résultats, on montrera que l'analogie entre ensembles maigres et ensembles de mesure 0 n'est pas parfaite. Le dernier résultat d'uniformisation évoque fournira une caractérisation plus parlante que celle évoquée ci-dessus
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Kirby, Jeff. "Distribution and dynamics of wintering waders in Britain with particular reference to weather." Thesis, Open University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295548.
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Baines, David. "The effects of improvement of upland, marginal grasslands on breeding waders (Charadriiformes) and invertebrates." Thesis, Durham University, 1988. http://etheses.dur.ac.uk/6726/.
Повний текст джерелаАнотація:
Between 1985 and 1987, ten areas of upland, marginal grassland were surveyed for breeding waders; eight areas west of the Pennines in the Eden Valley, Cumbria, and two East of the Pennines at Alston, Cumbria and Teesdale, Co. Durham. Grassland improvement resulted in the virtual disappearance of snipe and marked decreases in both the density and the proportion of fields used by breeding lapwing, curlew and redshank. The absence of snipe following improvement was due to land drainage, whereas reduced curlew densities resulted from vegetation changes, redshank were relatively unaffected provided wet areas persisted nearby. Data on lapwing breeding success were obtained from a study of 637 clutches. Fewer clutches suffered predation on unimproved than on improved pastures and resulted in higher hatching success. This, combined with more failed clutches being replaced and better survival by young chicks, resulted in higher productivity on unimproved than on improved pastures. The role of predation in reducing hatching success was confirmed experimentally. In addition, more clutches were destroyed by agricultural activities on improved than on unimproved meadows, resulting in lower productivity. Productivity on unimproved areas was enough to sustain the population, but was insufficient on improved areas and it is suggested that this, together with high philopatry, causes the decline in density of lapwings on improved areas. Invertebrates were sampled by chemical expellents, soil cores and pitfall traps. Grassland improvement resulted in increased earthworms and beetles other than carabids, but decreased spiders and carabic beetles. Fewer species of spider after improvement were largely due to lowered vegetation architecture diversity, whilst fewer species of tipulids resulted from reduced soil moisture and loss of food plants. Changes in species composition were apparent when comparing the seasonal pattern of pitfall catches on unimproved and improved grassland.
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Essig, Erica Carla. "Long-term population trends and habitat preferences of waders at Strandfontein wastewater treatment works." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/23782.
Повний текст джерелаАнотація:
The aims of the dissertation are to describe long term migrant and residential wader population trends at Strandfontein, and to identify the potential factors which influence local wader abundance. Once identified, these factors are integrated into a management plan that would create ideal wader habitat, and attract larger numbers of waders to Strandfontein.
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Laidlaw, Rebecca Anne. "Managing wet grassland landscapes : impacts on predators and wader nest predation." Thesis, University of East Anglia, 2013. https://ueaeprints.uea.ac.uk/47963/.
Повний текст джерелаАнотація:
Since the early twentieth century there has been widespread loss and degradation of wetlands resulting from land drainage and agricultural intensification. Many breeding wader populations in wetlands across Western Europe have declined severely as a consequence of this habitat loss, and their ranges are now increasingly restricted to nature reserves. The habitat requirements of these species, and management actions to achieve these conditions, are well-established but the recovery of many populations may be limited by high levels of predation of eggs and chicks. In this thesis, I assess the distribution of mammalian predators and their small mammal prey in a landscape managed for breeding waders within lowland wet grasslands, and use these findings to consider the potential for habitat management to reduce levels of nest predation for lapwing, Vanellus vanellus, and redshank, Tringa totanus. Within these wet grasslands, I show that small mammals are almost entirely restricted to tall vegetation, which is rare and typically occurs only in verges outside fields. Lapwing nest predation rates are lower when nests are closer to these verges and when there is more verge in the surrounding landscape. Lapwing nest predation is also lower when nests are closer to field edges in drier fields, and further from field edges in wetter fields. Red foxes are the primary nest predator, and nest predation rates of lapwing and redshank, and fox use of tracking plots, are lower when lapwing nest densities are higher. Modelled scenarios of potential influence of future changes in reserve management indicate that changes in surface flooding would have little impact on lapwing nest predation, but removal of verges could result in significant increases of ~10%. Combining environmental factors associated with nest predation with realistic habitat modifications can be a useful tool for assessing the potential scale of consequences of management actions.
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Wunderlich, Jo (Jo Parks). "Echoes of Eugenics : Roe v Wade." Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc279248/.
Повний текст джерелаАнотація:
Traces the inter-related histories of the eugenics movement and birth control, with an emphasis on abortion. Discusses Sarah Weddington's arguments and the Supreme Court's ruling in Roe v Wade. Straws the eugenic influences in the case and asserts that these influences caused the decision to be less than decisive.
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Watkins, Charlotte Mary Horton. "Fannyard manure application as a management tool for conserving breeding waders on lowland wet grassland." Thesis, Harper Adams University College, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492007.
Повний текст джерелаАнотація:
Breeding waders have suffered widespread population declines on lowland wet grassland. Conservation efforts on reserves are concentrated on the provision of optimum foraging and nesting conditions to improve wader productivity. This thesis aimed to investigate the potential offarmyard manure (FYM) application to increase soil invertebrate availability (a component of wader diet) in spring, thereby enhancing foraging habitat quality. Fieldwork was conducted in 2004-2006 on lowland wet grassland RSPB reserves to assess. the effects of FYM at rates of 5, 10 and 15 tonnes ha-1 on soil invertebrates and other factors of relevance to wader conservation and wider management objectives. Additional studies were carried out to investigate the response of earthworms to FYM on a finer scale and establish the role of earthworms in the diet, habitat choices and foraging efficiency of lapwing adults and chicks. An increase in earthworm availability in the breeding season was seen following an autumn application ofFYM spread at rates of 10 and 15 tonnes ha-1 Ã?Â? There was a strong aggregative response of earthworms to FYM on a small scale. No effect of FYM application at these rates was seen on epigeal invertebrate numbers, but the average body mass of Coleoptera increased on FYM treatments. There was no evidence to suggest a detrimental effect on either soil or vegetation properties on reserves. Earthwonn availability was an important factor in foraging choice and rates in female adult lapwing and for older chicks, with chicks close to fledging showing significantly greater levels of earthworms in their diet. An assessment of the gross energy content of common earthworm species suggests the increases in earthworm availability seen at these rates of FYM application are sufficient to be biologically meaningful to waders in the Breeding waders have suffered widespread population declines on lowland wet grassland. Conservation efforts on reserves are concentrated on the provision of optimum foraging and nesting conditions to improve wader productivity. This thesis aimed to investigate the potential offarmyard manure (FYM) application to increase soil invertebrate availability (a component of wader diet) in spring, thereby enhancing foraging habitat quality. Fieldwork was conducted in 2004-2006 on lowland wet grassland RSPB reserves to assess. the effects of FYM at rates of 5, 10 and 15 tonnes ha-1 on soil invertebrates and other factors of relevance to wader conservation and wider management objectives. Additional studies were carried out to investigate the response of earthworms to FYM on a finer scale and establish the role of earthworms in the diet, habitat choices and foraging efficiency of lapwing adults and chicks. An increase in earthworm availability in the breeding season was seen following an autumn application ofFYM spread at rates of 10 and 15 tonnes ha-1 Ã?Â? There was a strong aggregative response of earthworms to FYM on a small scale. No effect of FYM application at these rates was seen on epigeal invertebrate numbers, but the average body mass of Coleoptera increased on FYM treatments. There was no evidence to suggest a detrimental effect on either soil or vegetation properties on reserves. Earthwonn availability was an important factor in foraging choice and rates in female adult lapwing and for older chicks, with chicks close to fledging showing significantly greater levels of earthworms in their diet. An assessment of the gross energy content of common earthworm species suggests the increases in earthworm availability seen at these rates of FYM application are sufficient to be biologically meaningful to waders in the field.
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Eglington, Sarah. "Managing water levels on wet grasslands for breeding waders : the use of shallow wet features." Thesis, University of East Anglia, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504849.
Повний текст джерелаАнотація:
Lowland wet grasslands support a wide range of biodiversity and provide important breeding grounds for many wader species. However, extensive drainage and conversion to arable cropping or intensively managed grassland has greatly reduced the abundance and quality of this habitat across Europe, and caused severe declines in many of the associated waders. Recent agri-environment initiatives provide opportunities to restore wet grasslands, but little is known about the key features necessary to support breeding waders and how these may conflict with commercial farming practises. For breeding waders, the re-introduction of water into the habitat is critically important, and this thesis examines methods of creating and managing within-field wet features and surface water, their impact on the distribution and breeding success of lapwing Vanellus vane/Ius, and the extent to which they are compatible with agricultural operations in the Broads, eastern England. Breeding lapwing are attracted to areas with extensive surface flooding. However, most surface water dries out during the breeding season. The creation of managed shallow wet features allowed water to be retained throughout the breeding season. Fields with higher wet feature densities attracted significantly more nesting lapwing and foraging chicks, and chick condition was significantly improved. Invertebrate biomass and chick foraging rates were higher in wet features than in the surrounding grazing marsh. Neither nest or chick predation rates were related to the proximity of wet features, but predation rates declined with density of lapwing in the vicinity, suggesting an influence of collaborative nest and brood defence. Farmers were keen to enter agri-environment schemes and to use shallow wet features, provided the design was not too complex. Wet feature installation is relatively simple, but maintaining sufficient water levels is critical, especially in the face of increasingly unpredictable water supplies associated with climate change. If managed correctly, shallow wet features offer a tool that may be both effective at improving breeding wader populations and practicable for commercial grazing marsh management.
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Mallon, Eileen Dolores. "The management of wet grassland for breeding waders in West Fermanagh and Erne Lakeland ESA." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361222.
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O'Brien, Mark Gregory. "Factors affecting breeding wader populations on upland enclosed farmland in northern Britain." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/15549.
Повний текст джерелаАнотація:
A multi-scale approach was taken in describing patterns of abundance of five species of breeding waders, oystercatcher. Haematopus ostralegus, lapwing Vanellus vanellus, snipe Gallinago gallinago, curlew Numenius arquata and redshank Tringa totanus, onupland enclosed grassland in northern Britain. Data from one region, in Wales, compared changes in wader numbers with changes in habitat at both site and field scales. This highlighted the importance of habitat and predation as factors affecting wader abundance. Data from a further eight regions in northern Britain enabled two sets of comparisons to be made. These were between a), wader abundance and habitat and b), changes in lapwing numbers with the present habitat and predator numbers. All five species were positively associated with wet habitats although each species was related to a unique pattern of habitat mosaics. Lapwings and oystercatchers avoided heathland and blanket bog and used short vegetation within grassland. Oystercatchers were also associated with arable fields. Curlews were positively associated with blanket bog in addition to wet habitats and fields with a mid-range of vegetation heights. Redshanks avoided heathland habitats, and preferred short vegetation. Snipe were associated with fields with a mid-range of vegetation heights. The habitat models were able to predict wader numbers well, indicating repeatability across regions. There was little variation in wader habitat associations at the scales considered. This was probably due to the limited and simplistic structure of upland enclosed grassland. Sites with declining lapwing numbers tended to have significantly fewer lapwings than predicted by the lapwing habitat models. This suggests that reasons other than loss of habitat were reducing lapwing numbers on these sites.
20
Jackson, David B. "Habitat selection and breeding ecology of three species of waders in the Western Isles of Scotland." Thesis, Durham University, 1988. http://etheses.dur.ac.uk/6330/.
Повний текст джерелаАнотація:
The habitat requirements and population dynamics of Redshank, Dunlin and Ringed Plover on internationally important breeding grounds in the Western Isles of Scotland were studied from 1985 to 1987 using individually colour-ringed birds. Twenty-six habitat types were recognised at four study-sites on South Uist. The temporal and spatial use of the habitats by the three species were quantified. Redshank used a wide variety of pasture, marsh and water's-edge habitats and occurred mainly on "blackland" areas. Dunlin were largely confined to areas of old fallow machair and machair marsh. Ringed Plover occurred almost exclusively on the areas of machair used for cultivation. Redshank did not defend breeding territories and individuals ranged over wide areas. Dunlin and Ringed Plover held breeding territories within which most of their activities were confined. Late in the breeding season the seashore was an important feeding habitat for Dunlin and Ringed Plover. Breeding densities varied markedly between major habitat divisions and appeared to be mainly determined by the availability and quality of potential nest-sites as indicated by their conspicuousness to avian predators. Adults, especially males, nearly always returned to their previous year's nest-site or to close by. Young males bred significantly closer to their natal site than young females. Most birds settled within 4 km of their natal site. Breeding success, first-year and adult survival, and the age of first’ breeding were evaluated. The data were used to predict population trends, which were compared to results from large-scale population surveys. It is concluded that Redshank and Dunlin numbers are approximately stable but that Ringed Plover are decreasing. Avian predation was the main factor limiting productivity. Both early season and well concealed/camouflaged nests were more likely to be successful.The conservation of these birds is discussed and some measures suggested that might increase their productivity.
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Ausden, Malcolm. "The effects of raised water levels on food supply for breeding waders on lowland wet grassland." Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338224.
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Bikoma, Florence. "Socialisation de la femme accomplie MUKAAS WADYA MAKƆ MA βYA chez les Ndzèbi du Gabon". Montpellier 3, 2004. http://www.theses.fr/2004MON30017.
Повний текст джерелаАнотація:
Cette thèse se propose de rendre compte des procédés d'intégration des femmes chez les NdzEbi pour l'acquisition non seulement du statut de femme mais aussi d'un statut spécifique conféré à certaines femmes. La première partie introduit à la connaissance de la société ndzEbi et la seconde établit un rapport entre les instances de socialisation et les attentes de la société. L'examen de nos matériaux laisse entrevoir que la puberté, l'initiation, le mariage et la maternité fondent la féminité dont l'acquisition implique un parcours qui ne donne pas toujours lieu à la reconnaissance symbolique que les NdzEbi appellent Mukaas wadya makO ma Bya. Ce statut paraît être une revanche de la position de la femme mythique ayant atteint la maîtrise sociale par la jonction des mondes (profane-sacré, visible-invisible, homme-femme). Se pose alors, sous l'action des mutations actuelles, la problématique de la restructuration des valeurs et des modèles qui construisaient l'identité de la femmeThis thesis proposes to account for the women's integration process in the NdzEbi tribe for the acquisition not only of the statute of woman but also of a specific statute conferred to certain women. The first section of the study introduced with the knowledge of the NdzEbi society. The second part draws up a relationship between the authorities of socialization and of the society's expectations. The examination of our materials lets foresee that puberty, initiation, marriage and maternity melt femininity. However, the acquisition of femininity implies a course, which does not always give place to the recognition of the symbolic system that NdzEbi call Mukaas wadya makO ma Bya. This statute appears like a revenge of the position of the mythical woman: mistress of the worships and initiations having reached the social control by the junction of the worlds (layman-crowned, visible–invisible, man-woman). Under the action of the current changes, the problems of the reorganization of the values and models, which built the identity of the woman, is posed
23
Rönkä, A. (Antti). "Dynamics, genetic structure and viability of a small and declining Temminck's stint (Calidris temminckii) population." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514281446.
Повний текст джерелаАнотація:
Abstract
Globally, populations of several wader species are in decline. However, for most populations, information on abundance, its changes and the causes of declines is insufficient for designing successful management strategies to recover threatened populations. In this thesis I studied the status and population trends, nesting success, genetic structure and viability of a small, declining and threatened Temminck's stint population in the Bothnian Bay in the northern Baltic Sea. Historical population data, recent population counts in the early 1990s and in 1999–2002 and the demographic data showed that the decline is continuing, paralleled by declines in nesting success, recruitment and adult survival.
Decline in nesting success was caused by a coincident increase in nest predation. Depredation was the main cause of nest losses. The common gull (Larus canus) and the ruddy turnstone (Arenaria interpres) were found to be the most important nest predators. I tested if an increase in nest concealment and consequent decrease in visibility lowers the efficiency of the early-departure antipredator behaviour of the species. An expected positive correlation emerged between visibility and flushing distance in the presence of alarm-giving birds, but not without them. This indicates that Temminck's stint exploits signals from other birds as early warning of an approaching predator. More nests were lost to predation on narrow than on wide shores. The nest predation rate was not related to habitat (natural vs. man-made) nor to differences in microhabitat characteristics associated with concealment.
Overall variability of the mitochondrial control region was low in the one northeast Siberian and the three Fennoscandian populations studied. The occurrence of two maternal lineages in all Fennoscandian populations points to mixing of two previously isolated populations. The overall microsatellite genetic structuring (6 loci) in Fennoscandia was low. The pairwise comparison revealed a low but significant degree of differentiation between the Bothnian Bay and the two other Fennoscandian populations. However, no clear indication of genetic effects of small population size in the Bothnian Bay was detected.
Matrix and Pradel-λ projection models, based on a ten year (1994–2003) capture-recapture data set, predicted a steep future decrease and a high risk of extinction within 50 years. Without immigration the decline would lead to extinction within 20 years. Population growth was the most sensitive to changes in adult survival, the rate of which declined during the study. Factors affecting adult survival most likely operate primarily during the non-breeding season in locations specific to the study population that are virtually unknown. Management efforts in the Bothnian Bay should, in addition to improving hatching success, first of all guarantee availability of wide, low-sward coastal breeding habitats for potential immigrants and recruits.
24
Facchini, Alessandro. "A study on the expressive power of some fragments of the modal µ-calculus." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14210/document.
Повний текст джерелаАнотація:
Dans ce travail nous étudions la complexité de certains fragments du mu-calcul selon deux points de vue: l’un syntaxique et l’autre topologique. Dans la première partie nous adoptons le point de vue syntaxique afin d'étudier le comportement du mu-calcul sur des classes restreintes de modèles. Parmi d'autres résultats, nous montrons en particulier que sur les modèles transitifs toute propriété définissable par une formule du mu-calcul est définissable par une formule sans alternance de points fixes. Pour ce qui concerne la perspective topologique, nous montrons d'abord que sur les modèles transitifs la logique modale correspond au fragment borélien du mu-calcul. Ensuite nous donnons une description effective des hiérarchies de Borel et de Wadge d'un sous-fragment sans alternance de cette logique sur les arbres binaires et vérifions que pour ce fragment les points de vue topologique et syntaxique coïncidentIn this work we study the complexity of some fragments of the modal mu-calculus from two points of view: the syntactical and the topological. In the first part of the dissertation we adopt the syntactical point of view in order to study the behavior of this formalism on some restricted classes of models. Among other results, we show that on transitive transition systems, every mu-formula is logically equivalent to an alternation free formula. For what concerns the topological point of view, we first prove that on transitive models, the modal logic is exactly the Borel fragment of the modal mu-calculus. Then we provide an effective description of the Borel and Wadge hierarchies of a sub-fragment of the alternation free fragment of the mu-calculus on binary trees. Finally we verify that for this fragment the syntactical point of view and topological point of view coincide
25
Egger, Aldo Joseph. "Einfluss der Spinalanästhesie auf die Durchblutung an Wade und Fuss /." [S.l : s.n.], 1986. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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26
Kingdon, Lorraine B. "When the Bald Eagles Cried in Arizona, Wade Eakle Listened." College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/295498.
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27
Mendez, Aragon Veronica. "Spatial and temporal variation in the functional diversity of non-breeding wader communities across British estuaries." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/42418/.
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28
Wadle, M. [Verfasser]. "Zweiphasenstroemung im Diffusor. Vergleich einer neuen Druckrueckgewinnformel und numerischer Berechnung durch Zweiphasencodes mit experimentellen Ergebnissen / M. Wadle." Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1196577595/34.
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29
Klöck, Julia. "Von Zwischentönen zur Autotherapie zeitgenössische Balladen am Beispiel von Franz Josef Degenhardt, Reinhard Mey und Hannes Wader /." [S.l.] : Universität Konstanz , Philosophische Fakultät, Fachgruppe Literaturwissenschaft, 1997. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8500752.
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30
Wady, Juma Bader [Verfasser]. "A Practical Approach To Robust Sliding Mode Control / Bader Wady Juma." Aachen : Shaker, 2010. http://d-nb.info/1081885947/34.
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31
Yu, Xiaofeng [Verfasser], and Rebecca [Akademischer Betreuer] Wade. "Multiscale Simulations of Cytochrome P450 Systems / Xiaofeng Yu ; Betreuer: Rebecca Wade." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180608305/34.
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32
Yu, Xiaofeng [Verfasser], and Rebecca C. [Akademischer Betreuer] Wade. "Multiscale Simulations of Cytochrome P450 Systems / Xiaofeng Yu ; Betreuer: Rebecca Wade." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180608305/34.
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33
Strum, Khara M. "Exposure of migratory shorebirds to organophosphorus and carbmate pesticides at migratory stopover and non-breeding sites in the western hemisphere." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/807.
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34
Ganotra, Gaurav Kumar [Verfasser], and Rebecca [Akademischer Betreuer] Wade. "Computational studies of drug-binding kinetics / Gaurav Kumar Ganotra ; Betreuer: Rebecca Wade." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/122050646X/34.
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35
Ganotra, Gaurav K. [Verfasser], and Rebecca C. [Akademischer Betreuer] Wade. "Computational studies of drug-binding kinetics / Gaurav Kumar Ganotra ; Betreuer: Rebecca Wade." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://nbn-resolving.de/urn:nbn:de:bsz:16-heidok-273745.
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36
Damamme, Gilles. "Transcendance de la fonction zêta de Carlitz par la méthode de Wade." Caen, 1990. http://www.theses.fr/1990CAEN2003.
Повний текст джерелаАнотація:
En 1935, Carlitz a défini une fonction zêta dans un corps de séries formelles à coefficients dans un corps fini. Cette fonction est un analogue de la fonction zêta de Riemann. Nous donnons une preuve de l'irrationalité et la transcendance des valeurs de cette fonction pour tous les entiers naturels. Les propriétés de transcendance de ces valeurs sont obtenues au moyen d'une puissante méthode de Wade que nous généralisons et appliquons à de nouvelles situations.
37
Ganotra, Gaurav K. [Verfasser], and Rebecca [Akademischer Betreuer] Wade. "Computational studies of drug-binding kinetics / Gaurav Kumar Ganotra ; Betreuer: Rebecca Wade." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/122050646X/34.
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38
Köllner, Anton [Verfasser], Christina [Akademischer Betreuer] Völlmecke, Christina [Gutachter] Völlmecke, M. Ahmer [Gutachter] Wadee, and Wolfgang H. [Gutachter] Müller. "An analytical framework for the structural stability analysis of damageable structures and its application to delaminated composites / Anton Köllner ; Gutachter: Christina Völlmecke, M. Ahmer Wadee, Wolfgang H. Müller ; Betreuer: Christina Völlmecke." Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156185602/34.
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39
Moses, Sarah. "Agency and the Elderly: A Christian Ethic of Care." Thesis, Boston College, 2011. http://hdl.handle.net/2345/3707.
Повний текст джерелаАнотація:
Thesis advisor: Lisa S. CahillInformed by Gaudium et Spes and Ron Thiemann's "public theology," this dissertation examines the role of the church in responding to the contemporary ethical challenge of providing long-term care for the elderly in a manner that respects and promotes their human dignity. Biblical sources and the theological concepts of discipleship and friendship found in Karl Barth and Paul Wadell insist on the agency of older people as called by God and as participating members of the community. This vision complements and connects with secular visions of justice such as Martha Nussbaum's "capabilities approach" and the concept of justice as participation found in United Nations' documents. Two concrete examples--the Community of Sant'Egidio and the Green House project--provide important models of long-term care that foster the agency of older people and their ongoing participation in human community and fellowship. An ethical vision based upon the elderly themselves as subjects with ongoing agency and purpose demands the church's engagement with the wider society to reform the United States' current long-term care system so that care is provided at a level and in a manner that overcomes marginalization of the frail elderly
Thesis (PhD) — Boston College, 2011
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Theology
40
Muzammal, Bilal. "Policy and Access : A Story of Marginalized Fishing Community in Pakistan." Thesis, Uppsala universitet, Institutionen för kulturantropologi och etnologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301096.
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41
Gomes, Liliana Medeiros. "The importance of Ria de Aveiro’s saltpans during winter for migratory." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16409.
Повний текст джерелаАнотація:
Mestrado em Ecologia AplicadaIntertidal wetlands are among the most productive habitats and support large numbers of waterbirds worldwide, however they are also one the most threatened habitats on the planet. The loss of intertidal habitats is considered a key factor in explaining the current decline of many waterbird populations. Anthropogenic supratidal habitats such as coastal saltpans can operate as buffer zones against the loss of natural coastal habitats. Therefore, saltpan abandonment can lead to a loss of the quality of these areas for waders. This study aimed to evaluate the implications that the current trend of traditional salt works abandonment can have on wader populations. Wader surveys were undertaken in saltpan tanks currently under one of 3 different regimes – active saltpans, active aquaculture and inactive/shattered – during both high tide and low tide between October 2014 and March 2015. The observations showed that a larger number of wintering waders use the active saltpans both during high and low tide. Nevertheless, the study of wader distribution in the different saltpans revealed differences between high tide and low tide. During rising tide, wader abundance significantly increases in active saltpans and aquaculture tanks and decreases in inactive tanks, whereas the opposite occurs during dropping tide. Active saltpans are an important feeding habitat for large waders, particularly for the black-winged stilt (Himantopus himantopus) and the black-tailed godwit (Limosa limosa), in both high tide and low tide. These results highlight the importance of artificial habitats such as active saltpans for wintering waders and the value of its correct management towards the conservation of waders in Ria de Aveiro.
As zonas húmidas intertidais são habitats altamente produtivos e suportam milhares de aves aquáticas em todo o mundo, contudo são também um dos habitats mais ameaçados globalmente. A perda de habitats intertidais é considerada um dos principais fatores que contribui para o atual declínio da maioria das populações de aves aquáticas. Habitats artificiais supratidais como as salinas costeiras, podem funcionar como zonas tampão contra a perda de habitats costeiros naturais. Uma vez que o abandono das salinas pode conduzir à perda da sua qualidade como habitat para as aves limícolas, este trabalho pretende contribuir para o estudo da sua importância, de forma a tentar prever as implicações que a atual tendência de abandono da exploração do sal pode ter nas populações de limícolas. Foram efetuadas contagens da avifauna limícola em 3 diferentes regimes de salinas – salicultura ativa, aquacultura ativa e salinas abandonadas/arrombadas - em situações de preia-mar e baixa-mar, entre Outubro de 2014 e Março de 2015. Verificou-se que um elevado número de limícolas na Ria de Aveiro utiliza as salinas independentemente do ciclo de maré, contrariando, assim, a ideia da sua utilização apenas como refúgio de preia-mar. Contudo, verificam-se diferenças substanciais entre as fases de preia-mar e baixa-mar. Durante a maré enchente a abundância de aves limícolas aumenta em tanques com salinas ou aquacultura ativas e diminui nas abandonadas, sendo que o inverso ocorre na maré vazante. As salinas ativas são um importante local de alimentação para espécies maiores como o perna-longa (Himantopus himantopus) e o milherango (Limosa limosa), tanto em situações de preia-mar como de baixamar. Estes resultados vêm reforçar a importância da manutenção de salinas ativas como estratégia de gestão e conservação da avifauna limícola invernante da Ria de Aveiro.
42
Silva, Leomyr Sângelo Alves da. "Influência das perturbações antrópicas sobre a escolha de locais de descanso de aves limícolas, Nordeste do Brasil." Universidade Estadual da Paraíba, 2016. http://tede.bc.uepb.edu.br/tede/jspui/handle/tede/2754.
Повний текст джерелаАнотація:
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Estuarine habitats are critical in the life cycle of shorebirds. In estuaries, these birds perform daily movements, feeding in intertidal zones at low tides and lounging on beaches and other supratidais areas during high tides. To reduce energy costs, the rest rooms must be near the feeding areas, but many of these sites are used by people for recreational activities and other occupations which probably disturb the birds. This study aimed to investigate the choices made by waders as their resting places near and adjacent to the estuary of the River Paraiba, northeastern Brazil. Were performed 4 monthly census from October 2014 to May 2015, quantifying the data abundance of birds and anthropogenic disturbances in two beaches of Paraíba coast, and in an artificial habitat (roof) that was used during the wintering period in the area urban Cabedelo, PB, Brazil. Censuses were carried out simultaneously in all counting sites, and were divided into day weekend and midweek. four species were recorded of wading birds belonging to the family Charadriidae (Charadrius semipalmatus and Charadrius collaris) and Scolopacidae (Calidris alba and Calidris pusilla). The species C. semipalmatus was the most representative for the study areas. The mean abundance of birds that occupied the roof were higher during the weekends, days that also there were major disturbances on the beaches from the days midweek when they were recorded smaller amounts of recreational activity. However, despite the positive influence on the increase of disturbances in poultry artificial housing, as well as the variation in the abundance of birds who used two beaches, the effects were significantly weaker, as shown by the dependency analysis. This study suggests that the number of anthropogenic occupations in both beaches, probably were not enough to scare away the birds nearctic areas rests indicating that the birds that have been using the artificial habitat are coming from other areas of Paraíba coast. In addition, we emphasize the importance of a greater number of sample areas for future research that seek to address the waders response in relation to anthropogenic influences, as possibly the small geographical scale of our study may have influenced our data.
Hábitats estuarinos são fundamentais no ciclo de vida das aves limícolas. Nos estuários, estas aves realizam movimentos diários, se alimentando nas zonas intertidais durante as marés baixas e descansando nas praias e outras áreas supratidais durante as marés altas. Para reduzir gastos energéticos, os locais de descanso precisam ser próximos às áreas de alimentação, porém muitos destes locais são utilizados por pessoas para atividades recreativas e outras ocupações, que, provavelmente, perturbam as aves. O presente estudo teve por objetivo investigar as escolhas feitas por aves limícolas quanto aos seus locais de descanso próximo e adjacentes ao estuário do Rio Paraíba, Nordeste do Brasil. Foram realizados 4 censos mensais entre outubro de 2014 à maio de 2015, quantificando os dados de abundância de aves e os distúrbios antrópicos em duas praias da costa paraibana, e em um habitat artificial (telhado) que foi utilizado durante o período de invernada na zona urbana de Cabedelo-PB, Brasil. Os censos foram realizados simultaneamente em todos os locais de contagem, e foram distribuídos em dias de final de semana e meio de semana. Foram registradas quatro espécies de aves limícolas pertencentes as famílias Charadriidae (Charadrius semipalmatus e Charadrius collaris) e Scolopacidae (Calidris alba e Calidris pusilla). A espécie C. semipalmatus foi a mais representativa para as áreas de estudo. As médias das abundâncias de aves que ocuparam o telhado foram maiores durante os finais de semana, dias em que também verificaram-se os maiores distúrbios nas praias em relação aos dias no meio da semana, quando foram registradas menores quantidades de atividade recreativas. No entanto, apesar dos distúrbios influenciarem positivamente o aumento de aves no habitat artificial, assim como a variação da abundância de aves que utilizaram as duas praias, os efeitos foram estatisticamente fracos, como revelado pela análise de dependência. O presente estudo sugere que o número de ocupações antrópicas nas duas praias, provavelmente não foram suficientes para afugentar as aves neárticas das áreas de descansos indicando que, as aves que vem utilizando o habitat artificial estão vindo de outras áreas da costa paraibana. Além disso, ressaltamos a importância de um maior número de áreas amostrais em futuras pesquisas que busquem abordar a resposta de aves limícolas em relação às influências antrópicas, já que, possivelmente a pequena escala geográfica de nosso estudo pode ter influenciado nossos dados.
43
Engelmoer, Meinte Brandsma Martin. "Breeding origins of wader populations utilizing the Dutch Wadden Sea as deduced from body dimensions, body mass, and primary moult." [S.l. : Groningen : s.n. ; University Library of Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/306073528.
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44
Zamora, Rafael. "Problèmes de séparation de relations analytiques." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066159.
Повний текст джерелаАнотація:
Soit F une famille de sous-ensembles d'un espace polonais X. Soient A et B deux sous-ensembles de X. A est séparable de B par un ensemble de F s'il existe C dans F qui contient A et n'intersecte pas B. Lorsque A et B sont des sous-ensembles analytiques et F est une classe de Wadge de boréliens, la non séparabilité de A et B a été caractérisée par Louveau et Saint Raymond. Ils ont fourni un exemple minimum, pour un certain quasi-ordre, ce qui est connu sous le nom de dichotomie à la Hurewicz. Dans les espaces polonais produit, de nouvelles familles naturelles d'ensembles apparaissent. Un exemple, qui est lié à l'étude des graphes définissables, est la classe des produits de deux ensembles dans deux classes Borel F et F'. On caractérise separabilité des ensembles analytiques, lorsque F et F' sont des classes de Borel de petit rang. Une autre classe naturelle est celle des boréliens qui sont dans une certaine classe F si on affine les topologies originales en d'autres topologies polonaises. Nous appelons ces ensembles potentiellement dans F. Lecomte a caractérisé la séparabilité des ensembles analytiques par des ensembles potentiellement dans F, lorsque F est une classe de Wadge de boréliens. Une question naturelle est de se demander si nous pouvons avoir cette dichotomie pour un quasi-ordre plus fin qui utilise des fonctions injectives. Dans la deuxième partie du manuscrit, on caractérise la separabilité pour ce quasi-ordre lorsque A, B sont des ensembles analytiques et F est la classe des ensembles potentiellement dans C. Des hypothèses plus fortes sont nécessaires, de sorte que nous développons une notion qui généralise à la fois l'acyclicité et la locale dénombrabilitéLet F be a family of subsets of a Polish space X. Given two subsets A and B of X, one says that A is separable from B by a set in F if there is C in F which contains A and does not intersect B. When A and B are analytic subsets and F is a Wadge class of Borel sets, the non separability of A and B was characterized by Louveau and Saint Raymond. They provided a minimum example, for some quasi-order, in what is known as a Hurewicz dichotomy. If we consider the product of two Polish spaces, new natural families of sets (and thus new separation problems) arise. An example, that is related to the study of definable graphs, is the class of products of sets in two Borel classes F and F'. We obtain a characterization of the separability when F and F' are Borel classes of low rank. Another natural class is the class of Borel sets which are in a certain class F if one refines the original topologies into other Polish topologies. We call these sets potentially in F. A dichotomy characterizing separability of analytic sets by sets potentially in F was proved by Lecomte when F is any Wadge class of Borel sets. However, a natural question is to ask whether we can have this dichotomy for a finer quasi-order, involving injective functions. In the second part of the manuscript, we give a characterization involving this other quasi-order when A,B are analytic sets and F is the class of sets potentially in C. Stronger hypothesis are needed, so we develop a notion that generalizes both acyclicity and local countability
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Neizel, Bryson Wade. "Alteration of chrome-to-iron ratio in chromite ore by chlorination / Bryson Wade Neizel." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4313.
Повний текст джерелаАнотація:
The industrial importance of the chromium industry to South Africa is
emphasised by the fact that it is considered the largest chromite (chromium
ore) and ferrochrome (chrome-iron alloy) producing country in the world.
Although South Africa holds three quarters of the world's chromite ore
reserves, the chrome-to-iron (Cr-to-Fe) ratio of the local chromite ores is
relatively low (1.47 to 1.55), compared to other deposits in the world (2.6 to
3.5). Additionally, iron is more readily reduced than chromium. The
combination of these two factors implies that ferrochrome produced from
South African chromite ore contains 47-53% chromium. Current pricing
practises in the world ferrochrome industry dictate that ferrochrome producers
are only paid for the chromium content in the ferrochrome, which implies that
South African ferrochrome producers export a large percentage of their
product without any financial benefit. Research to improve the Cr-to-Fe ratio
is therefore essential to support sustainability of the local ferrochrome
industry.
Conventional beneficiation methods such as gravity concentration, magnetic
separation and floatation are unlikely to increase the Cr-to-Fe ratio, since both
iron and chromium are part of the same mineral phase, i.e. the spinel, which
requires structural dissociation. It has been proven on laboratory scale that
high temperature carbochlorination (CO and Clz atmosphere) can be used to
selectively remove iron from chromite. However, such methods are unlikely to
be implemented on an industrial scale due to health, environmental and cost
considerations. In light of this, an alternative approach to chromite
chlorination, avoiding the use of chlorine and other toxic gasses, was
investigated during this study. Since it was found that NaCI addition
significantly improved the effectiveness of carbochlorination of chromite, the
effect of adding only NaCI during high temperature treatment of chromite was
investigated. The material utilised during this investigation consisted of local chromite,
anthracite (source of carbon) and attapulgite clay (serving as a binder).
These materials were mixed in a ratio and subsequently milled to 0 90 = 75fJm
to represent materials and specifications similar to those used during
pelletisation of the chromite in the pre-reduction ferrochrome production
process. This mixture could also be used to generate a partially reducing
atmosphere (CO rich) during high temperature treatment, which was similar to
the reaction conditions utilised during carbochlorination. The abovementioned
milled mixture was pelletised into cylindrical pellets with a die set
and a hydraulic press.
This experimental investigation was based on a mono-variance procedure, in
that the four different variables investigated, i.e. maximum pellet treatment
temperature, exposure time, wt% NaCI addition to the pellets and the
atmosphere the pellets were exposed to, were varied one at a time during
experimentation. After each alteration of the afore-mentioned variables, the
Cr-to-Fe ratios, together with other parameters, were measured. Analyses
undertaken included Scanning Electron Microscopy, with Energy-Dispersive
X-ray Spectroscopy (SEM-EDS), Inductively Coupled Plasma Optical
Emission Spectrometry (ICP-OES) and cured breaking strength.
Although this investigation did not focus on the cured breaking strength of the
pellets, it is a very important industrial parameter and was therefore
measured. Results indicated that the addition of NaCI had a definite effect. In
both oxidising and partially reducing atmospheres the cured breaking strength
of the cured pellets increased up to 800°C exposure, whereafter it decreased.
This was attributed to melting of NaCI at 801 °C. In the oxidising atmosphere,
the cured breaking strength increased again at temperatures higher than
1 000°C, due to the formation of a thin oxldised layer on the outside of the
pellets, which could be confirmed by SEM analysis.
Fine, metallic-like crystals were noticed inside and on the lids of crucibles in
which pellets containing NaCI as an additive were cured at temperatures of 900°C or higher. SEM-EDS analysis and weight-ratio calculations revealed
that these crystals were pure FeO. This indicated that some iron might have
been liberated from the chromite spinel matrix. However, ICP-OES analyses
revealed that Cr-to-Fe ratios did not change significantly under any of the
experimental conditions (NaCI addition 5wt% to 15wt%, curing between 500'C
and 1200'C, and oxidative/partially reducing atmospheres).
The observed FeO crystals did not make any meaningful difference to the Crto-
Fe ratio of the chromite, but was of great academic interest as iron was
extracted from the chromite spinel. This indicated that it is not only the
formation of low melting point species, such as those proposed in previous
mechanistic studies of carbochlorination of chromite, but that molten NaCI
alone could also initiate the extraction of iron out of chromite. According to
the knowledge of the author, this is the first report of its nature in open
literature.
SEM and SEM-EDS analyses also proved that the addition of NaCI to the
chromite/carbon/clay mixtures enhanced the rate of chromite pre-reduction.
This finding was in agreement with earlier literature reports.
In conclusion, it can be stated that the addition of NaCI alone cannot alter the
Cr-to-Fe ratio of chromite during high temperature treatment. NaCI addition
did, however, have an effect on other important parameters i.e. initiation of
iron removal, cured breaking strength and the rate of chromite pre-reduction.
From the results and experience gained in this study, certain
recommendations with regard to possible future studies could also be made.
This included investigating i) other single component additives to possibly
alter the Cr-to-Fe ratio during high temperature treatment, ii) the effect of
industrially relevant additives such as CaO/CaC03, Mg03 and SiOz on the rate
of chromite pre-reduction and iii) the effect of different clays (e.g. attapulgite,
bentonite, etc.) on the rate of chromite pre-reduction.Thesis (M.Sc. (Chemistry))--North-West University, Potchefstroom Campus, 2010.
46
Ginebreda-Frendel, Elena. "Was Roe v. Wade Enough?: The Effects of Post-Roe Policies on Low-Income Women." Scholarship @ Claremont, 2013. http://scholarship.claremont.edu/scripps_theses/243.
Повний текст джерела
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Babalola, Grace T., and Ademola Adedoyin. "A Statistical Review of the U.S. Abortion Policy Since the Ruling of Roe v. Wade." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/asrf/2020/presentations/30.
Повний текст джерелаАнотація:
Since the ruling of Roe v. Wade in 1973, controversy in regards to its acceptance in the U.S. remains prevalent politically and socially as opponents of abortion “pro-life” has adopted a strategy of “legal but inaccessible” that has resulted in the passage of several state laws since its establishment.
This research project examines relationship between the level of support for abortion policy in the U.S. and some factors namely; Gender, Religious background, and Political ideology by drawing from an online-survey of 100 university students in the U.S. Also, it examines the difference in abortion rates among U.S. states that are governed by republican or democratic governors using abortion rate data of all 50 U.S. states including the District of Columbia for the year 2015 sourced from Abortion statistics and other data. Two statistical techniques were employed and they include: Chi-Square test and Independent sample T-test. Results from the chi-square tests support the null hypothesis that there is no relationship between the support for abortion policy and gender, religious background, and political ideology. Also, from the T-test result, we found that there is no significant difference in abortion rates among U.S. states that are governed by republican or democratic governors. Findings based on the trend analysis of annual U.S. abortion from 1973-2015 shows that the reported annual abortion in the U.S. is on a continuous decrease since the 1990s even though abortion has been legalized in all U.S. states.
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Öztürk, Mehmet Ali [Verfasser], and Rebecca C. [Akademischer Betreuer] Wade. "A computational approach to decipher chromatosome structure determinants / Mehmet Ali Öztürk ; Betreuer: Rebecca C. Wade." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/121641873X/34.
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Al, Wadie Malek [Verfasser]. "LINGUISTISCHE, KULTURELLE UND DIDAKTISCHE GRUNDLAGEN DES UNIVERSITÄREN ÜBERSETZUNGSUNTERRICHTS IN SAUDI-ARABIEN UNTER BESONDERER BERÜCKSICHTIGUNG DES SPRACHENPAARES ARABISCH UND DEUTSCH / Malek Al Wadie." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1045195103/34.
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Collins, Andrew. "Ambient Micro-Climate and Thermal Comfort Assessment of Davis Wade Stadium during the 2016 Football Season." Thesis, Mississippi State University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10842871.
Повний текст джерелаАнотація:
College football stadiums host anywhere from 15,000 to 115,000 people each Saturday from late summer to early winter and leave fans exposed to ambient conditions. Amplified heat from stadium infrastructure substantially impact attendants’ thermal comfort. In order to assess personal heat exposure and mitigate exposure misclassification, temperature and relative humidity sensors (iButtons) were placed throughout Mississippi State University’s Davis Wade Stadium during the 2016 Football Season. iButton measurements established a micro-climate and compared its readings to the Soil Climate Analysis Network site 1.2 miles north of the stadium. The program RayMan Pro modeled a Physiological Equivalent Temperature (PET) micro-climate to create an individualized heat metric. The results of this study assess stadium occupants’ thermal comfort through Heat Index and PET. Heat-related health outcomes were examined regarding thermal comfort and the stadium micro-climate using data from the stadium’s EMS calls and First Aid stations during game days.