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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.
41

Vectors’ infecting ability modulation for Xylella fastidiosa invasions management in Italian olive orchards

Piccotti, Ugo 12 November 2023 (has links)
Recent estimates have revealed that more than 6.5 million olive trees in southern Italy have subdued to the Xylella fastidiosa infection, leading to the devasting Olive Quick Decline Syndrome (OQDS). This epidemic continues to expand, posing a significant threat to global olive oil production. OQDS has already resulted 30-34% reduction in ecosystem services provided by olive orchards and a 28% decline in associated biodiversity. Additionally, OQDS has annihilated productivity and the entire olive oil supply chain, causing considerable economic losses. To counteract the relentless spread of Xylella, Integrated Transmission Management (ITM) strategies are crucial. Reducing one vector per olive tree present in an olive orchard can confine X. fastidiosa within acceptable economic and environmental limits. Thus, monitoring and managing vector populations are crucial to curbing disease transmission. The complex interactions between insects and microorganisms are pivotal in the OQDS scenario. Understanding these interactions can provide insights into novel control strategies, such as disrupting bacterial symbiosis with Aphrophoridae foams, affecting the fitness of vector insects, and potentially reducing X. fastidiosa transmission. To counteract Xylella transmission effectively, biocontrol measures must be incorporated into IPM strategies for olive orchards. However, more than the current arsenal of vector antagonists is required. The entrance into the Europe of Zelus renardii shows promise in biocontrolling Xylella vectors. Furthermore, Z. renardii's ability to manage other olive pests adds to its utility. Zelus renardii's bionomics and its ability to regulate alarm pheromones via Brindley glands is crucial for its effective use in IPM strategies. The formulation of artificial diets for mass-rearing Z. renardii under controlled conditions can pave the way for its inundative release to enhance ITM. These biological and biotechnological control measures have the potential to significantly reduce Philaenus spumarius populations and the infective capacity of Xylella vectors within IPM strategies. This approach can also act preventively and protectively, reducing the risk of future infections and limiting repeated transmissions. Progress has been made in modulating the transmission abilities of Xylella vectors, while the challenge of OQDS and X. fastidiosa remains tricky. The availability of Z. renardii and exploring its capabilities offer a more sustainable and effective approach to managing this disease in olive production.
42

Hide

Bruhns, Calvin 01 April 2024 (has links) (PDF)
An alien from an emotionless species hides from her own kind on Earth by stealing the skin of a young woman, but when the alien starts to feel that woman’s emotions, she finds that human impersonation is more than skin deep.
43

Medo e alteridade no cinema de ficção científica: uma análise a partir dos filmes \"O Planeta dos macacos\" e \"Alien - o oitavo passageiro\" / Fear and alterity in science fiction cinema: an analysis of \"Planet of the apes\" and \"Alien\"

Duarte, Luciana Teixeira 13 November 2018 (has links)
O medo é sinônimo da incerteza, da ignorância frente ao desconhecido. E, assim como argumentado por Bauman (2008), a escuridão não é a causa do perigo, mas é o habitat natural da incerteza - e, portanto, do medo. Na sociedade há inseguranças em praticamente todas as instâncias da vida e o sujeito vivencia o medo constante. Como reflexo dessa sociedade globalizada, baseada na privatização e desregulamentação, a cultura da mídia por vezes figurativiza, representa o tema do medo (de desastres naturais, doenças, desemprego, terrorismo) à imagem de monstros fantásticos, ou contrafactuais. São seres que confrontam nossa identidade e ameaçam a estabilidade social. Ao misturar a fantasia a elementos reais (promovidos pela ciência) o gênero da ficção científica utiliza um cenário futuro para levantar questionamentos sobre a sociedade atual e as relações entre o eu e o outro. A partir dessa discussão, neste estudo utilizamos o universo ficcional de dois filmes que fazem sucesso há mais de quatro décadas unindo terror e ficção científica, para, a partir deles, agrupar teorias e referenciais que possibilitem problematizar a alteridade no gênero da ficção científica e compreender como ela reflete os medos e as ansiedades. Os filmes O planeta dos macacos (1968) e Alien - o oitavo passageiro (1979) foram analisados pela perspectiva de autoras e autores dos Estudos Culturais, como Fredric Jameson, Douglas Kellner e Stuart Hall, além da metodologia de análise fílmica e da semiótica greimasiana. Observamos como conclusão que os seres alienígenas têm mais em comum com a espécie humana do que pensamos num primeiro momento; eles são capazes de aflorar os sentimentos mais obscuros, como a ganância e o ódio; geram insegurança e ameaçam a vida e o bem-estar / Fear is synonymous with uncertainty, with the ignorance in the face of the unknown. And, as argued by Bauman (2008), darkness is not the cause of danger, but it is the natural habitat of uncertainty - and therefore, fear. In society, there are insecurities in virtually every instance of life and people experiences constant fear. As a reflection of this globalized society, based on privatization and deregulation, media culture is sometimes figurative, representing the theme of fear (natural disasters, illness, unemployment, terrorism) as fantastic or counterfactual monsters. They are beings who confront our identity and threaten social stability. By blending fantasy with real elements (promoted by science), the genre of science fiction uses a future scenario to raise questions about current society and the relationship between self and other. From this discussion, in this study we used the fictional universe of two films that have been successful for more than four decades, uniting terror and science fiction, and, from them, group theories and references that make it possible to problematize the otherness in the genre of science fiction and to understand as it reflects fears and anxieties. The films The Planet of the Apes (1968) and Alien (1979) were analyzed from the perspective of authors of Cultural Studies, such as Fredric Jameson, Douglas Kellner and Stuart Hall, as well as the methodology of film analysis and Greimasian semiotics. We have observed that the alien creatures in the film have more in common with the human species than we might think at first; they are able to surface the most obscure feelings, such as greed and hatred; they can generate insecurity and threaten life and welfare
44

Medo e alteridade no cinema de ficção científica: uma análise a partir dos filmes \"O Planeta dos macacos\" e \"Alien - o oitavo passageiro\" / Fear and alterity in science fiction cinema: an analysis of \"Planet of the apes\" and \"Alien\"

Luciana Teixeira Duarte 13 November 2018 (has links)
O medo é sinônimo da incerteza, da ignorância frente ao desconhecido. E, assim como argumentado por Bauman (2008), a escuridão não é a causa do perigo, mas é o habitat natural da incerteza - e, portanto, do medo. Na sociedade há inseguranças em praticamente todas as instâncias da vida e o sujeito vivencia o medo constante. Como reflexo dessa sociedade globalizada, baseada na privatização e desregulamentação, a cultura da mídia por vezes figurativiza, representa o tema do medo (de desastres naturais, doenças, desemprego, terrorismo) à imagem de monstros fantásticos, ou contrafactuais. São seres que confrontam nossa identidade e ameaçam a estabilidade social. Ao misturar a fantasia a elementos reais (promovidos pela ciência) o gênero da ficção científica utiliza um cenário futuro para levantar questionamentos sobre a sociedade atual e as relações entre o eu e o outro. A partir dessa discussão, neste estudo utilizamos o universo ficcional de dois filmes que fazem sucesso há mais de quatro décadas unindo terror e ficção científica, para, a partir deles, agrupar teorias e referenciais que possibilitem problematizar a alteridade no gênero da ficção científica e compreender como ela reflete os medos e as ansiedades. Os filmes O planeta dos macacos (1968) e Alien - o oitavo passageiro (1979) foram analisados pela perspectiva de autoras e autores dos Estudos Culturais, como Fredric Jameson, Douglas Kellner e Stuart Hall, além da metodologia de análise fílmica e da semiótica greimasiana. Observamos como conclusão que os seres alienígenas têm mais em comum com a espécie humana do que pensamos num primeiro momento; eles são capazes de aflorar os sentimentos mais obscuros, como a ganância e o ódio; geram insegurança e ameaçam a vida e o bem-estar / Fear is synonymous with uncertainty, with the ignorance in the face of the unknown. And, as argued by Bauman (2008), darkness is not the cause of danger, but it is the natural habitat of uncertainty - and therefore, fear. In society, there are insecurities in virtually every instance of life and people experiences constant fear. As a reflection of this globalized society, based on privatization and deregulation, media culture is sometimes figurative, representing the theme of fear (natural disasters, illness, unemployment, terrorism) as fantastic or counterfactual monsters. They are beings who confront our identity and threaten social stability. By blending fantasy with real elements (promoted by science), the genre of science fiction uses a future scenario to raise questions about current society and the relationship between self and other. From this discussion, in this study we used the fictional universe of two films that have been successful for more than four decades, uniting terror and science fiction, and, from them, group theories and references that make it possible to problematize the otherness in the genre of science fiction and to understand as it reflects fears and anxieties. The films The Planet of the Apes (1968) and Alien (1979) were analyzed from the perspective of authors of Cultural Studies, such as Fredric Jameson, Douglas Kellner and Stuart Hall, as well as the methodology of film analysis and Greimasian semiotics. We have observed that the alien creatures in the film have more in common with the human species than we might think at first; they are able to surface the most obscure feelings, such as greed and hatred; they can generate insecurity and threaten life and welfare
45

Expatriate social support network, psychological well-being, and performance : a theoretical examination and an empirical test

Wang, Xiaoyun, 1964- January 2001 (has links)
Expatriate social interactions and psychological well-being are two underemphasized areas in expatriate literature. This paper revisits the expatriate adjustment construct and proposes a definition from interactive perspective for expatriate adjustment. Expatriate adjustment is defined, in this study, as a process in which the expatriate interacts with the social aspects of the local environment to obtain psychological well-being. In turn, an expatriate's psychological well-being at one point in time will influence his/her next interactions in the local environment. Based on the proposed definition of expatriate adjustment and supported by literatures of sociology and psychology, a research model and hypotheses are developed. The research model predicts that expatriate network structural characteristics will influence expatriate perceived social support and further influence expatriate psychological well-being and performance. The influence of social support on expatriate psychological well-being and performance is predicted to be moderated by cultural distance, role characteristics and locus of control of expatriates. Spousal support is another immediate factor that will influence expatriate psychological well-being. In order to empirically test this research model, two pilot studies and one main study were conducted. The purpose of Pilot Study 1 was to develop network structural characteristic measurement and social support measurement. Pilot Study 2 was conducted to test the measurement developed in Pilot Study 1 and check the workability of the whole questionnaire. The main survey was conducted in China. Expatriates from North America, Europe, and other countries and regions in Asia were sampled to complete the questionnaire. The data collected were analyzed to test the hypotheses. The results show significant support for the proposed model. Expatriate network structural characteristics have both direct and indirect influence on expatriate psychological well-
46

The impact of international labour migration in Indonesia / by Rianto Adi.

Adi, Rianto January 1996 (has links)
Bibliography: leaves 355-378. / xviii, 378, [89] leaves : ill., maps ; 39 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis is concerned with the understanding and clarification of the impact of international labour migration in Indonesia. The overall aim of this study is to investigate the economic, social and demographic consequences of international labour migration on the migrants, their families, their communities of origin and their nation of origin. / Thesis (Ph.D.)--University of Adelaide, Dept. of Geography, 1997
47

Cinema e doença: representações da enfermidade através da série Alien / Cinema and illness: representations of the illness ideia throught of serie Alien

Oliveira, Jefferson Luis Ribas de 23 March 2010 (has links)
Made available in DSpace on 2017-07-10T17:55:52Z (GMT). No. of bitstreams: 1 Jefferson_Luis_Ribas_de_Oliveira.pdf: 732638 bytes, checksum: 11d54d1eeada85eb4794754cebc68f3d (MD5) Previous issue date: 2010-03-23 / Fundação Araucária / The problematic of this paper is to discuss how the representation of illness can be visualized in movies of the series of Scientific Fiction Series Alien, one of the most popular cinematic saga of all times, and in what way the illness ideia is there presented. The sources used on this research are the four movies of this North American serie: Alien (Ridley Scott, 1979), Aliens (James Cameron, 1986), Alien 3 (David Fincher, 1992) and Alien: Ressurrection (Jean-Pierre Jeunet, 1997). The central question of this term paper is to analyze how, through of the representation of the alien , the ideia of the illness is present in movies of this cinematic saga. During this history, countless illness were in a discursive way receiving dark metaphors. Ideas such as pollution, plague, scourge, Wrath, the evil that comes from outside, grounding were a constant in a description of a stigmatize kind of illness, such as Leprosy and Aids. This paper has an aim to interpret how these metaphors about the illness appeared in these movies, which are showed with monstrosity, no nature an escape of the established knowledge. Through film narrative analyses, we showed how the alien being, protagonist of the saga is exactly presented like these allegories about the illness idea. Equally we also looked for questioning how the body idea is treated in movies, articulating to it the thematic of the human genetic to a new totalitarism of the private initiative that is overlapped in relation to the State power. Although the Hollywood movie can be considered one of the most sophisticated of way of what was stipulated to call cultural industry, we proposed with this research demonstrate that these cinematic productions has its value as historic documents, which the deep analyse can reveal riveting questions about countless thematics, what helps to show how much the cinema is an extremely rich language, since its narratives are part of a component of the social imaginary, and it is lived when the film period that the film piece are performed, certainly it becomes fertile fields in order to make possible to visualize some fears which the current tine demonstrates. / A problemática deste trabalho é discutir como a representação de doença pode ser visualizada nos filmes da série de Ficção Científica Alien, uma das mais populares sagas cinematográficas de todos os tempos, e de que forma a idéia de enfermidade é ali apresentada. As fontes utilizadas nessa pesquisa são os quatro filmes desta série norte-americana: Alien O Oitavo Passageiro (Ridley Scott, 1979), Alien O Resgate (James Cameron, 1986), Alien 3 (David Fincher, 1992) e Alien A Ressurreição (Jean-Pierre Jeunet, 1997). A questão central dessa dissertação é analisar como, através da representação de um alienígena , a idéia de doença se faz presente nos filmes dessa saga cinematográfica. Durante a História, inúmeras enfermidades foram discursivamente ganhando metáforas sombrias. Idéias como poluição , peste , flagelo , Ira de Deus , o mal que vem de fora , castigo foram uma constante na descrição de doenças estigmatizantes, como por exemplo, a Lepra e a Aids. Esse trabalho busca interpretar como essas metáforas sobre a doença aparecem nos filmes escolhidos, que se apresentam como idéias de monstruosidade, não-natureza e fuga ao conhecimento pré-estabelecido. Através das análises das narrativas fílmicas, mostramos como o ser alienígena protagonista da saga se apresenta exatamente como essas alegorias sobre a idéia de enfermidade. Igualmente procuramos também problematizar como a questão do corpo é tratada nos filmes, articulando a isso a temática da genética humana a um novo totalitarismo da iniciativa privada que se sobrepõem a o poder do Estado. Embora o cinema hollywodiano possa ser considerado uma das formas mais sofisticadas do que se convencionou chamar indústria cultural , propomos com essa pesquisa demonstrar que essas produções cinematográficas têm seu valor como documentos históricos, cuja análise mais aprofundada pode nos revelar questões instigantes sobre inúmeras temáticas, o que ajuda a mostrar o quanto o cinema é uma linguagem extremamente rica, pois suas narrativas são partes integrantes de um imaginário social, imaginário este vivenciado no período em que as obras fílmicas são realizadas, tornando-se campos férteis para que possamos visualizar determinados medos que o tempo presente demonstra.
48

Pollinator-Mediated Interactions Between Alien and Native Plants: Alien Status and Spatial Relationships

Charlebois, Julia January 2017 (has links)
The introduction of species outside of their native ranges has been extensively studied in ecology. Particular attention has been paid to examining interactions between alien and native plants, and a large proportion of this attention has focused on pollinator-mediated interactions. In order to interact through pollinators, plants must co-occur, coflower, and share pollinators; studies investigating pollinator-mediated interactions between alien and native plants frequently make fundamental assumptions about the definition of these prerequisites to pollinator-mediated interaction. The present analysis examines assumptions about plant co-occurrence and the effects that these assumptions have on study outcomes. In Chapter 2, I present the results of a meta-analysis of 76 studies which overturns previous findings that pollinator-mediated interactions between plants can be predicted on the basis of whether the neighbour is an alien, phylogenetic distance, or floral trait similarity. Moreover, I demonstrate that the spatial definition of the control group (i.e. the distance between the group of focal plants that ‘do not co-occur’ with the alien/alternate neighbour species and the nearest individuals of that neighbour species), and the spatial arrangements of plants within their treatment groups (i.e. the relative placement of the group of focal plants that ‘co-occurr’ with the neighbour species), both have a significant impact on the outcome of pollinator-mediated interactions between alien and native plants. I also emphasize evidence of bias in the selection of study systems and in the process of publication. In Chapter 3, I present the results of a field experiment testing the role of distance between interacting plants in determining patterns of visitation by insects. The results of this analysis are suggestive of visitor functional group-dependent effects but limited by low power. In both Chapter 2 and Chapter 3, I show that heretofore unexamined assumptions about definitions of co-occurrence of plants may be introducing bias into studies of pollinator-mediated interactions between plants, and that facilitation and competition between plants for visitation may be linked across different spatial scales.
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Spridning av invasiva främmande växter vid hantering av jordmassor : En undersökning om rutiner i Sveriges kommuner / Spread of Invasive Alien Plants when Handling Soil Masses : an Examination of Routines in Municipalities of Sweden

Eriksson, Anna January 2023 (has links)
Dealing with invasive alien species (IAS), have become a more common problem for themunicipalities of Sweden over the past years. IAS is one of the largest threats to biologicaldiversity and the spread of invasive alien plants is caused by transportation, travel, climatechanges but also infrastructure projects. Thus, the risk of spreading them must be dealt withearly in the progress of handling soil masses. This study examines if recommended routines(with the aim of reducing the risk of spreading invasive plants) are incorporated inmunicipalities and how well they function. It further examines if routines for invasive plantsare related to the size of the municipality, due to differences in economy and resources. Aform was sent to all 290 municipalities in Sweden and 132 answered. The results show thatmany of the recommended routines are not well incorporated across municipalities. Routineswith demands of knowledge about IAS to coworkers or entrepreneurs is less functioning thanroutines of intern information, such as where invasive plants are established on propertiesthat’s own by municipalities. Results show that available resources and economy due to sizeof the municipalities do not influence the level of incorporation of routines. It’s warranted formunicipalities to establish functioning routines within the organization to prevent increasingspread of invasive alien plants in an early stage. The issue should be addressed in decisionsmade by politicians to confirm the level of priority since the benefits of prevention is higherthan benefits of elimination and eradication.
50

Expatriate social support network, psychological well-being, and performance : a theoretical examination and an empirical test

Wang, Xiaoyun, 1964- January 2001 (has links)
No description available.

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