• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 52
  • 35
  • 6
  • 6
  • 4
  • 3
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 132
  • 18
  • 16
  • 13
  • 11
  • 11
  • 10
  • 9
  • 8
  • 8
  • 8
  • 7
  • 7
  • 6
  • 6
  • 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.
91

Comportamento de cultivares de girassol em função da época de semeadura na regiao de Ponta Grossa, PR

Thomaz, Giovani Luiz 08 December 2008 (has links)
Made available in DSpace on 2017-07-25T19:29:40Z (GMT). No. of bitstreams: 1 Giovani Luiz Thomaz.pdf: 6275316 bytes, checksum: cee0e3535b246c72086e661ab566880b (MD5) Previous issue date: 2008-12-08 / The search of crops for biodiesel production in Brazil is increasing. The sunflower (Helianthus annuus L.) has high oil content, has low demand of water and has the possibility of being cultivated in different times of the year. These characteristics may turn out this crop to be important for biodiesel production, occupying “spaces” in production systems and crop rotations adopted by farmers. Accordingly, one study was carried out, at the Experimental Station of Ponta Grossa of Instituto Agronômico do Paraná – IAPAR, with the objective of evaluating the effect of sowing date on the cycle, agronomic characteristics, yield of achenes, oil content and oil yield. Four cultivars of sunflower (Aguará 4, Catissol, Hélio 250 e M734) were tested in ten sowing dates, spaced around twenty days, with the first sowing day in July 30, 2007 and the last in January 28, 2008. The highest yield of achenes and oil occurred on crops at the end of July, in August and in September. The cultivars M734 e Aguará 4 had the highest yield of achenes. The sowing dates influenced all the variables studied. / É crescente a busca por matéria-prima para produção de biodiesel no Brasil. O girassol (Helianthus annuus L.), por apresentar elevado teor de óleo, baixa exigência hídrica a ter a possibilidade de ser cultivado em diferentes épocas do ano, pode tornar-se uma importante cultura para este fim, ocupando “janelas” dentro dos sistemas de produção e de rotação de culturas adotados pelos agricultores. Neste sentido, um trabalho foi conduzido na Estação Experimental de Ponta Grossa, do Instituto Agronômico do Paraná - IAPAR, com o objetivo de avaliar o efeito da época de semeadura no ciclo, características agronômicas, rendimento de aquênios, teor de óleo dos aquênios e rendimento de óleo em quatro cultivares de girassol (Aguará 4, Catissol, Hélio 250 e M734) em dez épocas de semeadura, espaçadas em torno de 20 dias, com a primeira época em 30/07/2007 e a última em 28/01/2008. Os maiores rendimentos de aquênios e de óleo ocorreram nas semeaduras de fim de julho, agosto e setembro. As cultivares M734 e Aguará 4 apresentaram maior rendimento de aquênios. As épocas de semeadura influenciaram todas as variáveis estudadas.
92

Le dieu Sol dans l’empire romain des antonins à Julien l’Apostat. Conventions iconographiques, lecture symbolique et portée politique / The Sun god in the Roman Empire from the Antonines to Julian the Apostate. Iconographic conventions, symbolic and political reading

Romagnan, David 11 January 2014 (has links)
Le dieu Sol, personnification de l’astre du jour, est documenté à Rome et en Italie bien avant l’avènement de l’empire. Dieu longtemps secondaire, ce n’est que durant l’Antiquité tardive qu’il gagne en importance, mais jamais au point de supplanter Jupiter et de devenir la divinité suprême. Cette étude a pour but d’offrir une approche renouvelée de l’interprétation de son image, en mettant en valeur la constance de son iconographie, l’uniformité des messages qui lui sont associés, son importance croissante dans l’idéologie politique impériale, et ensuite de les expliquer et de les réintégrer dans une perspective plus globale du IIe au IVe siècle. Cette présente thèse a ainsi pour but d’étudier les représentations du dieu Sol, à la fois personne divine et personnification de l’astre diurne, puis d’en déduire la nature du pouvoir cosmique du dieu, notamment par l’étude des documents dans lesquels il est mis en relation directe ou indirecte avec d’autres divinités, et de mettre en relief la spécificité de l’utilisation de l’image du dieu Sol dans un contexte impérial. / The Sun deity was documented in Rome and in Italy well before the advent of the Empire. Considered secondary for a long time, this god’s importance grows only during the late Antiquity.This study aims at offering a renewed approach of its image by emphasizing the constancy of its iconography, the uniformity of the messages associated to it, and its increasing importance in the imperial political ideology which we are to explain and place in a more global perspective from the 2nd to the 4th century.Within this thesis we will study the representations of the Sun deity, as a god and as the personification of the sun. From the analysis of its documented relationship to other divinities we will establish its cosmic power and the particular use of its image in an imperial context.
93

Arthur Bliss's emerging voice : a study of two song cycles on texts by Li Po

Johnson, Mary Ellen 23 June 2011 (has links)
Not available / text
94

Social cohesion and trade and exchange during the Late Woodland period investigated through the All Seasons Site (12M1225)

Klabacka, Rachel L. January 2010 (has links)
Access to abstract permanently restricted to Ball State community only / Theoretical background -- Environmental setting -- Prehistory within the Upper Wabash River Valley -- Data sets -- Results -- Discussion and conclusion. / Access to thesis permanently restricted to Ball State community only / Department of Anthropology
95

Barns tankar och idéer om himlakropparnas rörelse : Vanliga astronomiska missförstånd / Children’s Thoughts and Ideas About Celestial Motion : Common astronomical misconceptions

Johansson, Elin January 2014 (has links)
Sammanfattning De flesta barn fängslas och visar intresse för temat rymden och finner vanligtvis att det är ett mycket intressant ämne. Fokusgruppen har varit elever i årskurs 4-6 och efter några större bortfall var det slutligen elever ifrån 8 klasser som deltog, totalt 94 elever. Eleverna fick svara på en enkät där eleverna i både text och bild bland annat fick förklara hur de trodde att objekten i sol–jord–månsystemet samverkade och rörde sig i förhållande till varandra, vad de placerade i centrum för detta system, hur de såg på orsaken till årstider samt varför vi har dag och natt. De två pedagogerna som undervisade klasserna fick svara på några frågor om hur de såg på undervisningen om astronomi, om den undervisningsmetod de använde sig av och på elevernas lärande och förståelse för ämnet astronomi.    I denna undersökning kunde samma typer av missuppfattningar ses hos dessa elever, som de missuppfattningar som har dykt upp i en rad olika undersökningar som genomförts tidigare år med andra barn ifrån olika länder. Några av de missuppfattningar som fanns hos eleverna i denna undersökning var bland annat att jorden var mittpunkten, något som en femtedel av eleverna visade. Att sol och måne låg i samma omloppsbana runt jorden, årstiderna orsakas av att avståndet till solen förändras och att dag/natt beror på jordens omloppsbana runt solen var några andra missuppfattningar som rådde bland eleverna. Användandet av konkret material och 3D-modeller i undervisningen om rymden tycks vara en viktig del för elevernas förståelse av området.   Nyckelord: undervisning om rymden – astronomiska missförstånd – årstider – dag/natt – omloppsbanor i sol–jord–månsystemet / Abstract Most children find astronomy an interesting subject and usually show an interest during lessons about the subject. The focus group in this paper is Swedish students in school year 4-6. In total there were 94 students from eight classes who answered the survey with simple drawings and explanations about for example how they thought the objects Sun–Earth–Moon orbit each other, which object they placed as the center in this system, what causes season and the reason behind day and night. Two teachers whom educate the students answered some questions about their teaching method, their thoughts about the subject in question and the students learning and understanding of astronomy.   In the study that are presented in this paper the same types of astronomical misconceptions can be seen amongst these students, that has been shown in similar studies of children all over the world. 20 % of the children in this study showed an earth centered Sun–Earth–Moon system. Other misconceptions that were shown was: the sun and the moon shares the same orbit around the earth, that the seasons are caused by the distance to the sun changing and that day and night happens because the earth orbits the sun. The use of concrete material and 3D-models in the education seemed to be important for the students understanding of the subject.   Keywords: Astronomy education – astronomy misconceptions – seasons – day/night – Celestial Motion in the Sun–Earth–Moon system
96

Beef cattle on semi-natural grasslands : production of meat and nature conservation /

Hessle, Anna, January 2007 (has links) (PDF)
Diss. (sammanfattning) Skara : Sveriges lantbruksuniv., 2007. / Härtill 5 uppsatser.
97

Atypical and typical winter depressive symptoms and responsiveness to light therapy, cognitive-behavioral therapy, or combination treatment /

Johnson, Leigh G. January 2005 (has links) (PDF)
Thesis (M.S.)--Uniformed Services University of the Health Sciences, 2005. / Typescript (photocopy).
98

Surface facial electromyography reactions to light-relevant and season-relevant stimuli in seasonal affective disorder /

Tierney Lindsey, Kathryn. Lindsey, Kathryn Tierney. January 2005 (has links) (PDF)
Thesis (Ph. D.)--Uniformed Services University of the Health Sciences, 2005. / Typescript (photocopy).
99

Variabilidade genética em duas populações braquíticas de milho após sete ciclos de seleção massal para prolificidade /

Cristeli, Dardânia Soares January 2018 (has links)
Orientador: João Antonio da Costa Andrade / Resumo: Populações braquíticas têm sido constantemente estudadas no melhoramento de milho, o interesse por cultivares de porte baixo tem aumentado, principalmente por tolerarem plantios adensados, permitindo maior número de plantas por hectare. A prolificidade é um dos principais componentes na produção do milho que além da estabilidade de produção permite maior eficiência na utilização de nutrientes na planta. O objetivo deste trabalho foi verificar a variabilidade genética, para diferentes caracteres, presente nas populações Isanão VF-1 e Isanão VD-1 após sete ciclos de seleção massal para prolificidade. Foram avaliadas 121 progênies de meios irmãos da população Isanão VF-1 e 65 progênies da população Isanão VD-1, ambas populações de milho braquítico, na segunda safra do ano agrícola 2017 (E1) e primeira safra 2017/2018 (E2). Os caracteres avaliados para as duas épocas de semeadura foram enfezamento, tombamento, prolificidade e rendimento de espigas, e apenas para a E2 foram avaliados florescimento feminino, altura de plantas, altura de espigas e rendimento de grãos. Foram estimados parâmetros genéticos e os ganhos esperados com seleção com intensidade de seleção de 20%, para cada época e conjuntamente. Para a população Isanão VF-1 foram estimadas herdabilidades que variaram entre 37,70% e 74,82%, e ganhos de -5,11%, -10,48% para enfezamento, 19,57% e 7,13% para prolificidade, 20,75% e 15,74% para rendimento de espigas na E1 e E2 respectivamente. Para a população Isanão VD-1 as her... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Maize brachytic populations have been constantly studied in maize breeding, the interest for low-growing cultivars has increased, mainly because they tolerate high density of plants. Prolificacy is one of the main components of yield in maize that besides the yield stability allows higher efficiency in the use of nutrients in the plant. The objective of this work was to verify the genetic variability for different carachteres in the Isanão VF-1 and Isanão VD-1 brachytic populations after seven cycles of mass selection for prolificacy. A total of 121 open cross corn progenies from the Isanão VF-1 population and 65 open cross corn progenies from the Isanão VD-1 population, both brachytic maize populations, were evaluated in first crop 2017 (E1) and second crop 2017/2018 (E2). The evaluated traits for the two seasons were corn stunt complex, fall index, prolificacy and ear yield, and only for E2 were evaluated feminine flowering, plant height, ear height and grain yield. Genetic parameters and expected gains with selection, with 20% of intensity, were calculated for each season and jointly. For the Isanão VF-1 population, heritabilities were estimated from 37.70% to 74.82%, and expected gains of -5.11%, -10.48% for corn stunt complex, 19.57% and 7.13% for prolificacy, 20.75% and 15.74% for ear yield at E1 and E2 respectively. For the Isanão VD-1 population the heritabilities varied between 8.01% and 75.36%, and estimated gains were -3.198% and -9.565% for corn stunt complex, 12.... (Complete abstract click electronic access below) / Mestre
100

Estrutura populacional do camarão sete-barbas Xiphopenaeus kroyerl (Heller, 1862) na foz do rio São Francisco, nordeste do Brasil / Population structure of sea-bob Xiphopenaeus kroyeri (Heller, 1862) from the region of São Francisco river, northeast of Brazil

Tonial, Liliane Sibila Schmaedecke 30 August 2011 (has links)
Xiphopenaeus kroyeri (Heller, 1862) has a wide marine distribution, occurring from North Carolina (EUA) to Rio Grande do Sul (Brazil), being the only Penaeidae found in the Western Atlantic. The species inhabits sandy or muddy ground in shallow waters. It s an important fishery resource to communities that live on the coast. The population structure analysis of sea-bob shrimp from São Francisco River mouth, Alagoas-Brazil, was the main objective of this study, and specifically the growth rate of the species. Along the research 4267 specimens of Xiphopenaeus kroyeri were collected, from which 47.93% males and 52.07% females, proportion differing from expected (1:1). The total length for males varied from 28.27 to 108.44mm (77.16 ± 0.27) with width of 80.17mm. The female reached higher length, varying from 11.20 to 125.51mm (82.03 ± 0.33) with width of 114.31mm. The average being significantly different (p> 0.0001). The weigh/length rate has showed exponential tendency, with allometric growth pattern. Moreover, the growth curves plotted in this study show that, after 24 months, the individuals from São Francisco River mouth had not reached the total length expected to the species yet, registering inferior values compared to other regions. Recruitment peaks differ from the ones established to the region, being the main peak in August/10 and the secondary in January/10, therefore the legal protection period to the species requires a review. Data evaluated in this study suggest the importance of further research, more specifically to evaluate the sustainability of the Xiphopenaeus kroyeri population, as well as to verify the efficiency of the laws applied to juvenile protection purposes. / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O camarão Xiphopenaeus kroyeri (Heller, 1862) apresenta distribuição geográfica extensa, ocorrendo da Carolina do Norte (EUA) ao estado do Rio Grande do Sul e é a única espécie do gênero do Atlântico Ocidental. Habita águas costeiras rasas com fundo de areia e lama e é um recurso pesqueiro extremamente importante para as populações em sua área de ocorrência. O objetivo deste estudo foi analisar a estrutura populacional do camarão sete-barbas na região da foz do rio São Francisco Alagoas, assim como o crescimento dos indivíduos da espécie em questão. Foram coletados 4.267 exemplares, dos quais 47,93 % eram machos e 52,07 % fêmeas, diferindo do esperado para a população (1:1). O comprimento total dos machos variou de 28,27 a 108,44 mm (77,16 ± 0,27) com amplitude de 80,17 mm. As fêmeas atingiram comprimentos maiores variando de 11,20 a 125,51 mm (82,03 ± 0,33) com amplitude de 114,31 mm. As médias foram significativamente diferentes (p> 0,0001). A relação peso/comprimento para Xiphopenaeus kroyeri apresentou tendência exponencial, com padrão de crescimento alométrico. No entanto, as curvas de crescimento plotadas neste estudo mostram que, ao fim de 24 meses, exemplares da espécie na região da foz do Rio São Francisco ainda não alcançaram o comprimento máximo teórico esperado, registrando valores inferiores aos de outras regiões. Com relação ao recrutamento, os períodos diferem daqueles que norteiam a época de defeso da espécie no Estado, sendo o pico principal registrado em agosto/10 e o secundário em janeiro/10. Os dados registrados sugerem a importância de estudos mais específicos para avaliar os níveis de sustentabilidade da população de Xiphopenaeus kroyeri assim como a necessidade de verificar a eficiência do defeso na proteção dos juvenis.

Page generated in 0.0628 seconds