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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

Morphology-based Fault Feature Extraction and Resampling-free Fault Identification Techniques for Rolling Element Bearing Condition Monitoring

SHI, Juanjuan January 2015 (has links)
As the failure of a bearing could cause cascading breakdowns of the mechanical system and then lead to costly repairs and production delays, bearing condition monitoring has received much attention for decades. One of the primary methods for this purpose is based on the analysis of vibration signal measured by accelerometers because such data are information-rich. The vibration signal collected from a defective bearing is, however, a mixture of several signal components including the fault-generated impulses, interferences from other machine components, and background noise, where fault-induced impulses are further modulated by various low frequency signal contents. The compounded effects of interferences, background noise and the combined modulation effects make it difficult to detect bearing faults. This is further complicated by the nonstationary nature of vibration signals due to speed variations in some cases, such as the bearings in a wind turbine. As such, the main challenges in the vibration-based bearing monitoring are how to address the modulation, noise, interference, and nonstationarity matters. Over the past few decades, considerable research activities have been carried out to deal with the first three issues. Recently, the nonstationarity matter has also attracted strong interests from both industry and academic community. Nevertheless, the existing techniques still have problems (deficiencies) as listed below: (1) The existing enveloping methods for bearing fault feature extraction are often adversely affected by multiple interferences. To eliminate the effect of interferences, the prefiltering is required, which is often parameter-dependent and knowledge-demanding. The selection of proper filter parameters is challenging and even more so in a time-varying environment. (2) Even though filters are properly designed, they are of little use in handling in-band noise and interferences which are also barriers for bearing fault detection, particularly for incipient bearing faults with weak signatures. (3) Conventional approaches for bearing fault detection under constant speed are no longer applicable to the variable speed case because such speed fluctuations may cause “smearing” of the discrete frequencies in the frequency representation. Most current methods for rotating machinery condition monitoring under time-varying speed require signal resampling based on the shaft rotating frequency. For the bearing case, the shaft rotating frequency is, however, often unavailable as it is coupled with the instantaneous fault characteristic frequency (IFCF) by a fault characteristic coefficient (FCC) which cannot be determined without knowing the fault type. Additionally, the effectiveness of resampling-based methods is largely dependent on the accuracy of resampling procedure which, even if reliable, can complicate the entire fault detection process substantially. (4) Time-frequency analysis (TFA) has proved to be a powerful tool in analyzing nonstationary signal and moreover does not require resampling for bearing fault identification. However, the diffusion of time-frequency representation (TFR) along time and frequency axes caused by lack of energy concentration would handicap the application of the TFA. In fact, the reported TFA applications in bearing fault diagnosis are still very limited. To address the first two aforementioned problems, i.e., (1) and (2), for constant speed cases, two morphology-based methods are proposed to extract bearing fault feature without prefiltering. Another two methods are developed to specifically handle the remaining problems for the bearing fault detection under time-varying speed conditions. These methods are itemized as follows: (1) An efficient enveloping method based on signal Fractal Dimension (FD) for bearing fault feature extraction without prefiltering, (2) A signal decomposition technique based on oscillatory behaviors for noise reduction and interferences removal (including in-band ones), (3) A prefiltering-free and resampling-free approach for bearing fault diagnosis under variable speed condition via the joint application of FD-based envelope demodulation and generalized demodulation (GD), and (4) A combined dual-demodulation transform (DDT) and synchrosqueezing approach for TFR energy concentration level enhancement and bearing fault identification. With respect to constant speed cases, the FD-based enveloping method, where a short time Fractal dimension (STFD) transform is proposed, can suppress interferences and highlight the fault-induced impulsive signature by transforming the vibration signal into a STFD representation. Its effectiveness, however, deteriorates with the increased complexity of the interference frequencies, particularly for multiple interferences with high frequencies. As such, the second method, which isolates fault-induced transients from interferences and noise via oscillatory behavior analysis, is then developed to complement the FD-based enveloping approach. Both methods are independent of frequency information and free from prefiltering, hence eliminating the tedious process for filter parameter specification. The in-band vibration interferences can also be suppressed mainly by the second approach. For the nonstationary cases, a prefiltering-free and resampling-free strategy is developed via the joint application of STFD and GD, from which a resampling-free order spectrum can be derived. This order spectrum can effectively reveal not only the existence of a fault but also its location. However, the success of this method relies largely on an effective enveloping technique. To address this matter and at the same time to exploit the advantages of TFA in nonstationary signal analysis, a TFA technique, involving dual demodulations and an iterative process, is developed and innovatively applied to bearing fault identification. The proposed methods have been validated using both simulation and experimental data collected in our lab. The test results have shown that the first two methods can effectively extract fault signatures, remove the interferences (including in-band ones) without prefiltering, and detect fault types from vibration signals for constant speed cases. The last two have shown to be effective in detecting faults and discern fault types from vibration data collected under variable speed conditions without resampling and prefiltering.
12

Zelená perspektiva. Variace zeleného politického myšlení v Česku / Green Perspective. Variations of Green Political Thinking in the Czech Republic

Křížkovský, Matyáš January 2016 (has links)
The presented work is devoted to the development of Czech environmental movement in 1990's which is accompanied by academic debate about de-radicalisation. The aim of the thesis is to explore what sort of particular changes in the field of political ideas could be identified behind notional de-radicalisation. For this purpose is first laid out the historical context within which the movements were created onto their political ideals. It is followed by an introduction of the theoretical approaches to analyse these ideologies, outlining the basic methodological assumptions for a morphological analysis of the journals of Hnuti Duha. This analysis shows that between the periods 1991-1994 and 1998-2000 can be seen significant ideological transformations that are linked both with the inclination to certain elements of conservative thought and partly an inclination to a non-political politics. Key words green political thinking, ideology, morphological analysis, environmental movement
13

Enhancing Morphological Analysis and Example Sentence Extraction for Japanese Language Learning / 日本語学習のための形態素解析と例文抽出の高度化

Tolmachev, Arseny 23 March 2022 (has links)
付記する学位プログラム名: デザイン学大学院連携プログラム / 京都大学 / 新制・課程博士 / 博士(情報学) / 甲第24033号 / 情博第789号 / 新制||情||134(附属図書館) / 京都大学大学院情報学研究科知能情報学専攻 / (主査)教授 黒橋 禎夫, 教授 河原 達也, 教授 楠見 孝 / 学位規則第4条第1項該当 / Doctor of Informatics / Kyoto University / DFAM
14

Outomatiese Afrikaanse tekseenheididentifisering / deur Martin J. Puttkammer

Puttkammer, Martin Johannes January 2006 (has links)
An important core technology in the development of human language technology applications is an automatic morphological analyser. Such a morphological analyser consists of various modules, one of which is a tokeniser. At present no tokeniser exists for Afrikaans and it has therefore been impossible to develop a morphological analyser for Afrikaans. Thus, in this research project such a tokeniser is being developed, and the project therefore has two objectives: i)to postulate a tag set for integrated tokenisation, and ii) to develop an algorithm for integrated tokenisation. In order to achieve the first object, a tag set for the tagging of sentences, named-entities, words, abbreviations and punctuation is proposed specifically for the annotation of Afrikaans texts. It consists of 51 tags, which can be expanded in future in order to establish a larger, more specific tag set. The postulated tag set can also be simplified according to the level of specificity required by the user. It is subsequently shown that an effective tokeniser cannot be developed using only linguistic, or only statistical methods. This is due to the complexity of the task: rule-based modules should be used for certain processes (for example sentence recognition), while other processes (for example named-entity recognition) can only be executed successfully by means of a machine-learning module. It is argued that a hybrid system (a system where rule-based and statistical components are integrated) would achieve the best results on Afrikaans tokenisation. Various rule-based and statistical techniques, including a TiMBL-based classifier, are then employed to develop such a hybrid tokeniser for Afrikaans. The final tokeniser achieves an ∫-score of 97.25% when the complete set of tags is used. For sentence recognition an ∫-score of 100% is achieved. The tokeniser also recognises 81.39% of named entities. When a simplified tag set (consisting of only 12 tags) is used to annotate named entities, the ∫-score rises to 94.74%. The conclusion of the study is that a hybrid approach is indeed suitable for Afrikaans sentencisation, named-entity recognition and tokenisation. The tokeniser will improve if it is trained with more data, while the expansion of gazetteers as well as the tag set will also lead to a more accurate system / Thesis (M.A. (Applied Language and Literary Studies))--North-West University, Potchefstroom Campus, 2006.
15

Outomatiese Afrikaanse tekseenheididentifisering / deur Martin J. Puttkammer

Puttkammer, Martin Johannes January 2006 (has links)
An important core technology in the development of human language technology applications is an automatic morphological analyser. Such a morphological analyser consists of various modules, one of which is a tokeniser. At present no tokeniser exists for Afrikaans and it has therefore been impossible to develop a morphological analyser for Afrikaans. Thus, in this research project such a tokeniser is being developed, and the project therefore has two objectives: i)to postulate a tag set for integrated tokenisation, and ii) to develop an algorithm for integrated tokenisation. In order to achieve the first object, a tag set for the tagging of sentences, named-entities, words, abbreviations and punctuation is proposed specifically for the annotation of Afrikaans texts. It consists of 51 tags, which can be expanded in future in order to establish a larger, more specific tag set. The postulated tag set can also be simplified according to the level of specificity required by the user. It is subsequently shown that an effective tokeniser cannot be developed using only linguistic, or only statistical methods. This is due to the complexity of the task: rule-based modules should be used for certain processes (for example sentence recognition), while other processes (for example named-entity recognition) can only be executed successfully by means of a machine-learning module. It is argued that a hybrid system (a system where rule-based and statistical components are integrated) would achieve the best results on Afrikaans tokenisation. Various rule-based and statistical techniques, including a TiMBL-based classifier, are then employed to develop such a hybrid tokeniser for Afrikaans. The final tokeniser achieves an ∫-score of 97.25% when the complete set of tags is used. For sentence recognition an ∫-score of 100% is achieved. The tokeniser also recognises 81.39% of named entities. When a simplified tag set (consisting of only 12 tags) is used to annotate named entities, the ∫-score rises to 94.74%. The conclusion of the study is that a hybrid approach is indeed suitable for Afrikaans sentencisation, named-entity recognition and tokenisation. The tokeniser will improve if it is trained with more data, while the expansion of gazetteers as well as the tag set will also lead to a more accurate system / Thesis (M.A. (Applied Language and Literary Studies))--North-West University, Potchefstroom Campus, 2006.
16

Nástroj na tvaroslovnou analýzu staré angličtiny / Morphological Analyser of Old English

Tichý, Ondřej January 2014 (has links)
The paper describes the construction and testing of an electronic application for automatic morphological analysis of Old English. It introduces resources and methodologies at our disposal based on the state of the art in the field of electronic analysis of Old English and on an overview of Old English morphology. A detailed account of the chosen methodology is offered and a specific description of the implementation is provided: from the acquisition and preparation of the input data and choice of technology to the programming and testing of the results. The resulting recall of 95% can be seen as a success of the project, however, the paper also shows how the recall may be improved. It also discusses further use of the analyser, especially the disambiguation of its results. The paper makes a future semi-automatic morphological tagging of Old English texts a real possibility. Powered by TCPDF (www.tcpdf.org)
17

Base de dados morfológicos de terminologias do português do Brasil : descrição e análise morfológica com vistas à disponibilização on-line

Coleti, Joel Sossai 12 April 2012 (has links)
Made available in DSpace on 2016-06-02T20:25:15Z (GMT). No. of bitstreams: 1 4555.pdf: 1644030 bytes, checksum: 011edee36bed7484fcbb263f0e272f79 (MD5) Previous issue date: 2012-04-12 / Universidade Federal de Minas Gerais / The researches in Linguistics and Language fields are extremely rich, consistent and efficient in Brazil, however, still aren‟t expressive in the Brazilian researches the issues involving morphology and terminology. In this context, this research aims to describe the structure of two terminological repertoire (Nanoscience / Nanotechnology and Biofuels), representing the area of Engineering, at the level of the internal structure of its constituent terms, checking out the main processes of terms construction. Using this morphological description was organized a database for future computational implementation and on-line data availability. Later, for the higher productivity processes the Rules of Words Formation were established, as established by SILEX Model. This model of morphological analysis was designed by Danielle Corbin (1987, 1991, 1997, 2004) and developed by his team. This research aims to fill a gap, analyzing and describing the possible morphological processes in Portuguese (Brazilian variant) terminology and examining the most productive rules by which words are formed. / As pesquisas nas áreas de Linguística e Letras são extremamente ricas, constantes e eficientes no Brasil, entretanto, ainda são pouco expressivas no cenário brasileiro as pesquisas envolvendo questões morfológicas em Terminologia. Diante deste cenário, esta pesquisa pretende descrever a estrutura de dois repertórios terminológicos (Nanociência/Nanotecnologia e Biocombustíveis), representativos da área de Engenharias, no nível da estrutura interna dos seus termos constitutivos, verificando-se os principais processos de construção dos termos. A partir dessa descrição morfológica, organizar-se-á uma base de dados de maneira que seja possível a implementação computacional e a disponibilização on-line dos dados obtidos. Posteriormente, para os processos de maior produtividade, estabelecer-se-ão as Regras de Formação de Palavras, conforme o Modelo SILEX. Este modelo de análise morfológica foi concebido por Danielle Corbin (1987, 1991, 1997, 2004) e posteriormente desenvolvido por sua equipe de trabalho. Esta pesquisa busca preencher uma lacuna, na medida em que analisa e descreve os processos morfológicos possíveis no âmbito de terminologias em português (variante brasileira) e examina as mais produtivas regras pelas quais os termos são formados.
18

Descrição e análise morfológica da terminologia da fisioterapia: subsídios para a organização de uma base de dados para o português

Ferreira, Daniela de Mattos 05 July 2013 (has links)
Made available in DSpace on 2016-06-02T20:25:20Z (GMT). No. of bitstreams: 1 5569.pdf: 1681293 bytes, checksum: e9f4b7d5925d6707a002b6223b43e031 (MD5) Previous issue date: 2013-07-05 / Universidade Federal de Minas Gerais / Nowadays, the description of linguistic knowledge has been necessary due to the requirement of Natural Language Processing (NLP) programs to be able to properly recognize and process a natural language. As well as for the general language, the specialized ones also require this description, once many tasks, such as extraction of candidate terms, have been incorporated into these NLP tools. Given this reality, the present study aimed to describe the structure of terminological repertoire of Physiotherapy at the level of the internal structure of its constituent terms, using the SILEX constructional morphology model, created by Danielle Corbin (1987, 1991, 1997, 1999). To get to this morphological description based on the assumptions of the SILEX model, it was necessary to go through some steps, such as: separation in terms of simple units, non-built complex, morphological built units and syntagmatic compounds. From this separation, it was revealed that there is a widespread incidence of syntagmatic compounds in this terminology, especially those formed with the following structure: "test X", with X being an eponymy. The results of morphologically built units were: suffixation is the predominant process, mainly formed with the suffixes -ia,-ite,- ose, the composition was second, highlighting the presence of greeks archeoconstituants. Considering these results, it was possible to organize a database of Physiotherapy s morphological terminology, containing the terms and the formation processes, as well as another correlated database, containing all archeoconstituants used in the formation of the terms. On this basis, we present the descriptive meaning of these units and related terms. We hope that these organized results might be useful for subsequent computational implementation and on-line availability of data. Thus, with this work, we intend to contribute to a better understanding of the morphological level, and call the attention of linguists for greater explicitness of linguistic knowledge, especially in the morphological level. / Atualmente, cresce a necessidade da descrição do conhecimento linguístico para que programas de Processamento de Linguagem Natural (PLN) possam processar e reconhecer corretamente uma língua natural. Assim como acontece com a língua geral, as linguagens de especialidade também necessitam de tal descrição, já que muitas tarefas, como por exemplo, extração de candidatos a termos, já estão sendo incorporadas às ferramentas de PLN. Diante dessa realidade, o presente trabalho teve como objetivo descrever a estrutura do repertório terminológico da Fisioterapia no nível da estrutura interna dos seus termos constitutivos, utilizando para tal o modelo de morfologia construcional SILEX, criado por Danielle Corbin (1987, 1991, 1997, 1999). Para chegar à descrição morfológica dos termos seguindo os pressupostos do modelo SILEX, foi necessário percorrer algumas etapas, quais sejam: separação dos termos em unidades simples, complexas não construídas, unidades construídas morfologicamente e compostos sintagmáticos. A partir dessa separação, foi possível perceber que há grande incidência de compostos sintagmáticos nessa terminologia, destacando-se os que são formados com a seguinte estrutura: teste de X , sendo esse X um termo eponímico. Das unidades construídas por processos morfológicos, os resultados obtidos foram: a sufixação é o processo preponderante, principalmente os formados com o sufixo -ia, - ite, -ose; a composição ficou em segundo lugar, destacando-se a presença de arqueoconstituintes gregos. Com esses resultados, foi possível a organização de uma base de dados morfológicos da terminologia da Fisioterapia, contendo os processos de formação dos termos, bem como uma outra base de dados relacionada, contendo todos os arqueoconstituintes utilizados na formação dos termos. Nessa base, apresentamos o significado descritivo dessas unidades e os termos relacionados. Esperamos que esses resultados assim organizados possam ser úteis para uma posterior implementação computacional e a disponibilização on-line dos dados obtidos. Dessa maneira, com este trabalho, pretendemos contribuir para um melhor entendimento do nível morfológico de terminologias, além de chamar a atenção de linguistas para uma maior explicitação do conhecimento linguístico, especialmente no nível morfológico.
19

Rubiaceae em um remanescente de floresta atl?ntica no Rio Grande do Norte, Brasil

M?l, Daniela Freu de Figueiredo 26 March 2010 (has links)
Made available in DSpace on 2014-12-17T14:10:20Z (GMT). No. of bitstreams: 1 DanielaFFM_DISSERT.pdf: 773191 bytes, checksum: 60b37210d19394ff5d3a3c0c9bfb1365 (MD5) Previous issue date: 2010-03-26 / Empresa de Pesquisa Agropecu?ria do Rio Grande do Norte / O presente trabalho consiste no levantamento taxon?mico da fam?lia Rubiaceae Juss., em um remanescente de floresta atl?ntica no estado do Rio Grande do Norte, ?rea conhecida localmente como Mata do Jiqui (5? 46' S e 35? 12' W). A Mata do Jiqui est? situada em uma fazenda pertencente ? Empresa de Pesquisa Agropecu?ria do Rio Grande do Norte (EMPARN) no munic?pio de Parnamirim e ocupa uma ?rea de 79 ha. A vegeta??o da ?rea ? classificada como Floresta Estacional Semidecidual, pertencendo ao dom?nio Mata Atl?ntica e o solo como Neossolos Quartizar?nicos ?rticos Latoss?licos. Este estudo foi baseado em an?lises morfol?gicas comparativas, utilizando amostras obtidas em campo no per?odo de setembro/2008 a setembro/2009 e cole??es herborizadas pertencentes ao acervo dos Herb?rios UFRN (Universidade Federal do Rio Grande do Norte) e Prof. Lauro Pires Xavier JPB (Universidade Federal da Para?ba). Foram registradas 15 esp?cies pertencentes a 12 g?neros. Os g?neros mais representativos foram Diodella Small. (3) e Chiococca P. Browne (2); e os demais, Alseis Schott, Borreria G. Mey., Cordiera A. Rich. Ex DC., Guettarda L., Margaritopsis C. Wright , Mitracarpus Zucc. ex Schult. & Schult. f., Psychotria L, Richardia L., Staelia Cham. & Schltdl. e Tocoyena Aubl., com uma esp?cie cada. Os principais caracteres utilizados para separar as esp?cies foram ? forma das est?pulas e os tipo e/ou posi??o das infloresc?ncias. Quanto ? distribui??o dos t?xons na ?rea de estudo, as esp?cies herb?ceas como Richardia grandiflora (Cham & Schltdl.) Steud, Diodella apicullata (Willd. ex Roem. & Schult.) Delprete, Spermacoce verticillata (L.) e Diodella sp, foram amplamente registradas nas ?reas de bordas onde existe intensa luminosidade, enquanto Mitracarpus hirtus (L) DC. e Spermacoce latifolia Aubl. se desenvolvem em ?reas mais sombreadas. J? Staelia aurea K. Schum. apresentou distribui??o mais restrita, conhecida de alguns indiv?duos em um ?nico local. Psychotria bahiensis DC. e Margaritopsis carrascoana (Delprete & E. B. Souza) C.M. Taylor & E. B. Souza, foram amplamente encontradas tanto no interior da floresta como nas bordas onde h? sombreamento. Alseis pickelii Pilg. & Schmale, ? um dos principais componentes arb?reos, contribuindo com a forma??o do dossel; j? os demais t?xons foram encontrados tanto nas bordas quanto no interior da mata. S?o apresentadas chaves para g?neros e esp?cies, descri??es morfol?gicas, ilustra??es, coment?rios sobre afinidades taxon?micas, distribui??o geogr?fica, dados fenol?gicos e ecol?gicos dos t?xons
20

Estudos morfologicos e ecologicos de especies de Lonchaeidae (Diptera) em frutos de Rubiaceae, Myrtaceae, Roseae e Fabaceae / Morphological and ecological studies of Lonchaeidae (Dipter: Tephritoidea) in fuits of Rubiaceae, Rosaceae and Fabaceae

Freitas, Kelsen Ferreira, 1982-, Prado, Angelo Pires do, 1942-2013 12 August 2018 (has links)
Orientador: Angelo Pires Prado / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-12T10:22:40Z (GMT). No. of bitstreams: 1 Prado_AngeloPiresdo_M.pdf: 2424545 bytes, checksum: 61928bd55efdc3c2c4da3a37b8af7e00 (MD5) Previous issue date: 2008 / Resumo: O Brasil apresenta ótimas condições climáticas para se tornar um dos maiores produtores de frutas tropicais do mundo. Apesar da importância brasileira na produção mundial de frutas, sua participação no mercado internacional ainda é baixa, especialmente, em razão da existência de barreiras comerciais, criação e certificação de zonas livres de pragas. As moscas-das-frutas (Diptera: Tephritidae e Lonchaeidae) são pragas de culturas de nêspera, goiaba e café ocasionando grandes prejuízos com o apodrecimento e a queda prematura dos frutos. A ingá é muito utilizada em zonas rurais e urbanas, servindo de reservatório natural dos lonqueídeos, os quais podem atacar frutos comerciais. Assim, os lonqueídeos e seus parasitóides (Hymenoptera) foram coletados para observar o desenvolvimento das larvas e dos adultos e suas relações ecológicas em cada espécie de fruto. Também foram realizados estudos morfológicos das espécies de lonqueídeos envolvidas, com ênfase na caracterização das fases imaturas correlacionadas com as características morfológicas dos adultos, mediante a coleta dos frutos em Campinas e Monte Alegre do Sul (estado de São Paulo), de acordo com a época de frutificação. Segundo os resultados dos estudos ecológicos, sugere-se a existência de manchas adequadas para a sobrevivência e reprodução das moscas-das-frutas do gênero Neosilba, esse fato foi observado nas coletas de frutos de diferentes famílias em Monte Alegre do Sul - SP. A ação do homem influenciou significativamente a comunidade das moscas-das-frutas, em especial as espécies de Neosilba e dos Hymenopetera galhadores e parasitóides em frutos de ingá. As moscas do gênero Neosilba possuem riqueza e abundância baixas nos frutos parasitados, provavelmente para evitar a competição inter e intra-específica. A riqueza e abundância dos Hymenoptera nos frutos amostrados também foram baixos, o que pode estar relacionado as variações sazonais das populações desses espécimes ou devido a ação do homem nos locais amostrados. De acordo com os resultados das análises morfológicas, sugere-se que as diferenças encontradas entre as diferentes espécies de Neosilba, apesar de serem sutis, refletem adaptações dessas espécies às condições diversas dos nichos ecológicos que cada uma explora e, portanto, indica que cada uma delas está sujeita a diferentes pressões seletivas causadas pelo seu ambiente. As estruturas morfológicas que apresentaram maiores diferenças significativas entre as espécies de Neosilba foram as asas dos indivíduos adultos e as mandíbulas e cornos dorsal e ventral retirados dos pupários das moscar emergidas. As diferenças intra-específicas em Neosilba foram observadas mais claramente em indivíduos de N. zadolicha, onde o tipo de alimento utilizado pelas larvas influenciou o tamanho de suas mandíbulas. Assim, conhecendo-se melhor a morfologia dos lonqueídeos, a distribuição das espécies em frutos nativos e em culturas de importância econômica, a competição entre essas espécies nos frutos e os índices de parasitoidismo nas espécies envolvidas, poderemos futuramente desenvolver técnicas de prevenção e de combate a essas moscas, minimizando a utilização de inseticidas, e, por conseguinte, favorecendo o crescimento da comercialização desses frutos no mercado externo. / Abstract: Brazil performs excellent climate conditions to become one of the largest producers of tropical fruits in the world. Despite the Brazilian role in world production of fruit, its participation in the international market is too low, due some trend obstacles and the guarantee of pest-free zones it has to offer. Fruit flies (Diptera: Tephritidae e Lonchaeidae) are pests of medlar crops, guava and coffee causing major damage to the decay and premature fruit drop. Ingá is widely used in rural and urban areas, serving as a natural reservoir of lonchaeids, which can attack fruits. Thus, the lonchaeids and their parasitoids (Hymenoptera) were collected to observe the development of the larvae and adults and their ecological relationship in every kind of fruit There were also morphological studies of the species of lonchaeids involved, with emphasis on characterization of immature stages correlated with the morphological characteristics of adults through the collection of fruit in Campinas and Monte Alegre do Sul (State of São Paulo), according to the season of fruiting. According to the results of ecological studies, it is suggested that there are spots suitable for the survival and reproduction of fruit flies of the genus Neosilba, this was observed in samples of fruit from different families in Monte Alegre do Sul - SP. Human activities have influenced the community of the frugivorous flies, especially the species of Neosilba and galling Hymenoptera and parasitoids in fruits of ingá. The flies of genus Neosilba have low richness and abundance in parasitized fruits, probably to avoid inter and intra-specific competition. The richness and abundance of Hymenoptera in fruits sampled were also low, which may be related to the seasonal variations of the population of such specimens or due to human action beings in the collection sites. According to the results of morphological analysis, it is suggested that the differences found between different Neosilba species, although subtle, these species reflect adjustments to the conditions of the several ecological niches that each operate, and thus, indicate that each species is subject to different selective pressures caused by the environment. The morphological structures that showed greater differences between the species of Neosilba were the wings of adults and the jaws, and dorsal and ventral horns from the pupae of the emerged flies. The intra-specific differences in Neosilba were seen most clearly in individuals of N. zadolicha, where the type of food used by the larvae influenced the size of its jaws. Thus, knowing is better lonchaeids the morphology of the distribution of species on native fruits and crops of economic importance, the competition between these species in fruits and parasitoids in the rates of species involved, we can further develop techniques to prevent and combat to these flies, minimizing the use of insecticides, and thus encouraging the growth of the marketing of these fruits in foreign markets. / Mestrado / Mestre em Parasitologia

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