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Auswahl der wissenschaftlichen Literatur zum Thema „POLKON“
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Zeitschriftenartikel zum Thema "POLKON"
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Tee, Chwee Ming. „Political connections, institutional investors monitoring and stock price synchronicity“. Managerial Finance 43, Nr. 11 (13.11.2017): 1236–53. http://dx.doi.org/10.1108/mf-03-2017-0099.
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Purpose The purpose of this paper is to examine the association between politically connected (POLCON) firms and stock price synchronicity, and whether this association can be attenuated by institutional investors. Design/methodology/approach This paper uses an ordinary least square regression model to examine the association between POLCON firms and stock price synchronicity; institutional ownership and stock price synchronicity; the moderating role of institutional ownership on the association between POLCON firms and stock price synchronicity; institutional domiciles and stock price synchronicity; and the moderating role of institutional domiciles on the association between POLCON firms and stock price synchronicity. Findings The result shows that POLCON firms are positively associated with stock price synchronicity. Further, the author also finds that institutional monitoring, through higher ownership by local institutional investors is associated with lower stock price synchronicity. In addition, this study documents evidence that institutional investors, particularly local institutional investors can improve stock price informativeness in POLCON firms. Research limitations/implications The results suggest that POLCON firms are plagued by severe agency problems, resulting in limited flow of firm-specific information to the capital markets. However, the author shows that POLCON firm’s agency problems can be attenuated through effective monitoring by institutional investors. Further, institutional domiciles are shown to be significantly associated with stock price synchronocity. However, effective monitoring is largely driven by local institutional investors, in line with the geographical proximity theory. Practical implications The results suggest that regulators should increase their surveillance and monitoring effort, particularly on firms with close ties to the government. In particular, POLCON firms should be required to be more transparent in their corporate dealings. Additionally, auditors should intensify their audit efforts on POLCON firm to provide more reliable financial information to minority shareholders, investors and analysts. Finally, institutional investors should be incentivized by the Malaysian Securities Commission, via, the code of governance to play an effective monitoring role in Malaysian firms. Originality/value This study reveals that POLCON firms’ severe agency problems can be alleviated by effective institutional monitoring. Further result identifies institutional domiciles as a significant factor in influencing monitoring effectiveness in POLCON firms. This paper provides insights into the dynamic interaction between political connections, institutional monitoring, firm governance and capital markets behavior of an emerging market.
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Tee, Chwee Ming, Angelina Seow Voon Yee und Aik Lee Chong. „Institutional Investors’ Monitoring and Stock Price Crash Risk: Evidence from Politically Connected Firms“. Review of Pacific Basin Financial Markets and Policies 21, Nr. 04 (Dezember 2018): 1850028. http://dx.doi.org/10.1142/s0219091518500285.
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Motivated by recent studies on political connections and stock price crash risk, this study investigates whether there is an association between politically connected (POLCON) firms and stock price crash risk. Further, we examine whether institutional investors’ ownership can moderate this association. Using a dataset of Malaysian firms for the period 2002–2012, we show that POLCON firms are associated with higher risk of stock price crashes. However, the positive association between POLCON and stock crashes is attenuated by higher institutional ownership, implying effective monitoring. Finally, we find that only local institutional investors can significantly mitigate the positive association between POLCON firms and stock price crash risk. This suggests that different types of institutional investors can produce different monitoring outcomes in POLCON firms.
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Keel, K. R., C. H. Gilliam, G. R. Wehtje, T. L. Grey, G. J. Keever und D. J. Eakes. „EVALUATION OF HERBICIDE ABSORPTION AND RELEASE PROPERTIES OF FIVE HERBICIDE-COATED FERTILIZERS“. HortScience 31, Nr. 5 (September 1996): 744f—745. http://dx.doi.org/10.21273/hortsci.31.5.744f.
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Several experiments were conducted to determine release rates of five oxadiazon-coated fertilizers. Five fertilizers and 4-mm glass beads (nonabsorbent control) were coated with 14C-oxadiazon + formulated oxadiazon, then placed in a separatory funnel and leached with 20 ml of water for 14 days. 14C-oxadiazon was quantified by use of liquid scintillation spectrometry. For glass beads, Nutricote, Meister, and Osmocote, 70% to 80% of the 14C-oxadiazon was recovered in the first two leaching events. Oxadiazon leached from Polyon was 47% during the first two events and remaining oxadiazon was slowly released over the next 12 leaching events. 14C-oxadiazon from the other fertilizers over the last 12 days of leaching was less than that recovered from Polyon. Evaluation of the total surface area of a 50-g sample revealed Polyon had the greatest total surface area of the five fertilizers. Scanning electron micrographs before and after leachingindicated potential erosion of the Polyon surface compared to little or no change in the surfaces of the other fertilizers.
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Derby, Scott A., und L. Eric Hinesley. „Fertilizing Containerized Atlantic White Cedar Seedlings“. Journal of Environmental Horticulture 23, Nr. 2 (01.06.2005): 97–100. http://dx.doi.org/10.24266/0738-2898-23.2.97.
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Abstract Containerized Atlantic white cedar [Chamaecyparis thyoides (L.) B.S.P.] seedlings were fertilized with five rates (0.0, 2.4, 4.8, 7.2, and 9.6 kg/m3) (0, 4, 8, 12, and 16 lb/yd3) of controlled-release fertilizers (CRF) [Osmocote 15N–4.0P–10.0K (15N–9P2O5–12K2O), 12–14 month southern formulation, with micros; and Polyon 18N–2.6P–10.0K (18N–6P2O5–12K2O), 9-month formulation, with micros]. Height, stem diameter, dry mass, and foliar nutrient concentrations were evaluated after 16 weeks. Growth was affected by fertilizer source and application rate, with no interaction. In general, the response to increasing fertilization was quadratic. Osmocote yielded larger plants than Polyon, probably owing to its higher P content. Osmocote (4.8 to 7.2 kg/m3) (8 to 12 lb/yd3) or Polyon (7.2 kg/m3) (12 lb/yd3) is suggested for container-grown seedlings the first year.
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Eswaran, Sumathy. „Marvin P Polson“. International Journal of Computer Applications 41, Nr. 9 (31.03.2012): 18–22. http://dx.doi.org/10.5120/5569-7660.
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Husby, Chad E., Alex X. Niemiera, Robert D. Wright und J. Roger Harris. „369 Influence of Temperature and Product on Nutrient Release Patterns of Three Polymer-coated Fertilizers“. HortScience 35, Nr. 3 (Juni 2000): 456A—456. http://dx.doi.org/10.21273/hortsci.35.3.456a.
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Use of polymer-coated fertilizers (PCFs) is widespread in the nursery and greenhouse industries. Temperature is the main factor affecting nutrient release from PCFs, yet there are few reports that quantify temperature-induced nutrient release. Since container substrate temperatures can be at least 40 °C during the summer, this research quantified the release of fertilizer salts in the diurnal container substrate temperature range of 20 to 40 °C. Three PCFs (Osmocote Plus 15-9-11, Polyon 18-6-12, and Nutricote18-6-8) were placed in water-filled beakers at 40 °C until one-third (Expt.1) or two-thirds (Expt. 2) of Osmocote's N was released. For Expts. 1 and 2, each fertilizer was put into sand-filled columns and leached with distilled water concurrent with column temperature incrementally increasing from 20 to 40 °C and then to 20 °C over a 20-h period. Leachate fractions were collected at every 2 °C increase and analyzed for fertilizer salts. In Expt.1 and in the range of 22 to 30 °C, salt release was highest, lowest, and intermediate for Nutricote, Osmocote, and Polyon, respectively. In the range of 38 to 40 °C, release was highest, lowest, and intermediate for Osmocote, Nutricote, and Polyon, respectively. In Expt. 2, salt release in the range of 22 to 30 °C was the same as in Expt. 1. However, at 38 to 40 °C, release was highest, lowest, and intermediate for Polyon, Nutricote, and Osmocote, respectively. Results show that salt release for PCFs are dependent on the temperature × fertilizer age interaction.
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MALOZOVSKY, Y. M., J. D. FAN, D. BAGAYOKO und J. T. WANG. „POLARONIC EFFECT IN MATERIALS WITH FERROELECTRIC PHASE TRANSITIONS“. International Journal of Modern Physics B 13, Nr. 29n31 (20.12.1999): 3555–59. http://dx.doi.org/10.1142/s0217979299003416.
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We studied polaron effects due to the interaction of an electron with optical phonons in ferroelectrics with a layered crystal structure. We evaluated the polaron self-energy using the effective T-matrix. We showed that transition from the large radius polaron to the small radius polaron is controlled by the interlayer interaction or interlayer spacing. We also found that the polaron interaction with the fluctuations of polarizability near the Curie temperature causes polaron localization.
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Fialko, N. S., und V. D. Lakhno. „Numerical Simulation of Small Radius Polaron in a Chain with Random Perturbations“. Mathematical Biology and Bioinformatics 14, Nr. 2 (16.07.2019): 406–19. http://dx.doi.org/10.17537/2019.14.406.
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We consider the dynamics of polaron in a chain using computational experiment. The temperature, which is simulated by random Langevin-type perturbations, and influence of external electric field are taking into account. In a sufficiently long unperturbed chain, the displacement of the center of mass of the polaron and its velocity does not depend on its length. In the semiclassical Holstein model, which is applied for simulations of charge transfer in DNA, the region of polaron existence in the thermodynamic equilibrium state depends not only on temperature, but also on the chain length. Therefore, when modeling dynamics from polaron initial data, the time dependences of the average displacement of the charge mass center at the same temperature are different for chains of different lengths. According to the results of computational experiment, for polaron of large radius the time dependence of the “average polaron displacement”, which takes into account only the polaron peak and its position, for chains of different lengths behaves almost equally at time intervals until the polaron will destroyed. The same slope of the polaron displacement allows us to estimate the average polaron velocity. The results of calculations demonstrate that in Holstein model at zero temperature, the mobility value of the large radius polaron is small but non-zero.
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Żurawik, Piotr, und Monika Placek. „The influence of fertilization on quality of inflorescences of easy pot freesia (Freesia Eckl. ex Klatt) grown from adventitious corms“. Acta Agrobotanica 64, Nr. 3 (2012): 59–66. http://dx.doi.org/10.5586/aa.2011.032.
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The experiments were carried out in 2006-2007, in the spring-summer season, in an unheated plastic tunnel. Adventitious corms of Easy Pot Freesia: 'Gompey', 'Popey' and 'Suzy', were the plant material. The influence of a traditional fertilizer Azofoska and slow-release fertilizers, Osmocote Plus 5/6, Osmocote Exact and Polyon 5/6, on the ornamental value of plants was evaluated. All fertilizers were applied at rates of 2.5 and 5.0 g × dm<sup>-3</sup>. Freesias cultivated without fertilizer were the control plants. The cultivar 'Gompey' was characterized by longer inflorescence shoots and flowers of greater diameter, while the cultivar 'Suzy' had more flowers than the plants of the other cultivars evaluated. Plants with the greatest number of flowers and the longest inflorescences and shoots were obtained when slow-release fertilizers Osmocote Plus 5/6 and Osmocote Exact were used, regardless of cultivar and fertilizer dose. Polyon was useless for freesia fertilization, since it resulted in a decrease of the ornamental value of plants. Plants fertilized with Polyon had fewer flowers, additionally with a smaller diameter, and their inflorescences were shorter and deformed.
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Keel, Kevin R., Charles H. Gilliam, Glenn R. Wehtje, Tim L. Grey, Gary J. Keever und Donald J. Eakes. „Herbicide Adsorption and Release Properties of Five Oxadiazon-Coated Fertilizers“. Journal of Environmental Horticulture 16, Nr. 4 (01.12.1998): 230–34. http://dx.doi.org/10.24266/0738-2898-16.4.230.
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Abstract Laboratory experiments were conducted to determine the release of oxadiazon coated on control-release fertilizers. Five fertilizers and glass beads (nonabsorbent control) were coated with 14C-oxadiazon + formulated oxadiazon at a herbicide-to-fertilizer concentration of 0.3 mg ai/g. Coated fertilizers were subjected to 14 consecutive daily water leaching events. For the control-release fertilizers, Nutricote, Meister and Osmocote, 70%–80% of the coated oxadiazon was released in the first 3 leaching events; each leaching event after the 7th leaching event contained less than 1% of total applied oxadiazon. In contrast, 56% of the total applied oxadiazon was leached from Polyon 24N–1.7P–10K (24–4–12) in the first 3 leachings and similar percentages of oxadiazon were leached over each of the last 11 leaching events. Coating the five fertilizers with isoxaben produced similar results. A second experiment evaluated the effects of the addition of Prime Oil, Complex (sticker), Plex (sticker), and Intac (sticker) on release rates of oxadiazon-coated Osmocote 17N–3.1P–10K (17–7–12). Oxadiazon-coated Osmocote alone and oxadiazon-coated Polyon alone were also evaluated. Eighty-five percent of the total applied oxadiazon was leached from oxadiazon-coated Osmocote alone during the first leaching event and less than 1% was recovered with each consecutive leaching after the third leaching. Oxadiazon-coated Osmocote treated with Plex responded similarly to oxadiazon-coated Osmocote. Oxadiazon-coated Osmocote treated with Complex, Intac, or Prime Oil and oxadiazon-coated Polyon lost 21%, 20%, 16%, and 24%, respectively, of the applied herbicide after the first leaching event. Thereafter, nearly equal amounts of oxadiazon (5%) were leached from Complex, Prime Oil, Intac and Polyon alone from the 6th through the 11th leaching events.
Dissertationen zum Thema "POLKON"
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Nilsson, Ylva, und Linn Engelholm. „Polisiära övningar mot pågående dödligt våld : En innehållsanalys av polisens övning POLKON HT2020“. Thesis, Högskolan i Gävle, Avdelningen för socialt arbete och kriminologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-36614.
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Syftet med studien var att studera polisens övning POLKON HT2020 och hur övningen kunde förstås utifrån den kunskap som finns om pågående dödligt våld. Vidare syftade studien till att ta reda på hur kunskapen och analysen av övningen kunde användas för att planera framtida övningar. Materialet som användes i studien bestod av polisens material från övningen POLKON HT2020 som genomfördes hösten 2020 i Jönköping. Syftet med övningen var att poliserna skulle öva på att möta och bekämpa pågående dödligt våld. Studien genomfördes som en kvalitativ innehållsanalys. Innehållsanalysen kopplades sedan samman med kriminologisk forskning samt rutinaktivitetsteorin och kognitiva psykologiska teorier. Resultatet visade att de moment som genomfördes i övningen i stor utsträckning överensstämde med den kunskap som finns om pågående dödligt våld. Framtida övningar bör bygga på kunskap om brottstypen för att på samma sätt förbereda poliserna på skarpt läge.The purpose of this study was to analyze the POLKON HT2020 drill and how its content can be utilised in comparison to the knowledge available about active shooter situations. Additionally, the study aimed at investigating how this knowledge and the analysis of the drill could be used in planning future police drills. The material used in the study consisted of the police´s written material about the POLKON HT2020 drill, which was done during fall 2020 in Jönköping. The purpose of the drill was to prepare the officers to handle an active shooter situation. The material in the study was examined by qualitative content analysis. The result of the content analysis was put in relation to criminological research, routine activity theory and cognitive psychological theories. The results showed that the drill to a large extent corresponds with currently available knowledge about active shooter situations. According to the conclusion of this study, future drills should be planned using criminological research and theory in order to guarantee the same knowledge as the POLKON HT2020 for future officers involved.
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Souza, Cintia Neves de. „Palinotaxonomia em espécies brasileiras de Gloxiniinae com ênfase no complexo Mandirola-Goyazia /“. Jaboticabal, 2017. http://hdl.handle.net/11449/151043.
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Orientador: Eduardo Custódio GasparinoCoorientador: Andréa Onofre de Araújo
Banca: Maria Amélia Vitorino da Cruz-Barros
Banca: Vania Gonçalves Lourenço Esteves
Resumo: A subtribo Gloxiniinae é composta por 21 gêneros e cerca de 160 espécies. No Brasil, Gloxiniinae possui 16 espécies, distribuídas em oito gêneros, sendo três endêmicos, geralmente encontrados em afloramentos rochosos de cerrados, campos rupestres ou florestas de galeria. Foram estudados os grãos de pólen de dez espécies brasileiras de Gloxiniinae (Gesneriaceae) pertencentes aos gêneros: Chautemsia A.O.Araujo & V.C.Souza (1 sp.), Gloxinia L'Hér. (3 spp.), Goyazia Taub. (2 spp.), Mandirola Decne. (3 spp.) e Seemannia Regel (1 sp.) com o objetivo de contribuir para a caracterização taxônomica do grupo e uma melhor delimitação dos gêneros e/ou espécies, com enfoque para as populações do complexo Mandirola-Goyazia, pois os dois gêneros e as espécies incluídas nesse complexo não aparecem bem delimitados em estudos taxonômicos e trabalhos de filogenia, e essa dificuldade pode ser explicada por apresentarem distribuição simpátrica, morfologia floral e fenologia muito semelhantes. Os grãos de pólen foram acetolisados, medidos, fotografados em microscópia óptica, microscopia eletrônica de varredura e transmissão e descritos qualitativamente. Os dados quantitativos foram analisados através de estatísticas descritiva e multivariada. Para as espécies brasileiras de Gloxiniinae analisadas, foram observadas variações entre os grãos de pólen principalmente quanto ao âmbito, forma, comprimento, largura e extremidades dos colpos, presença ou não de margem, tipo de endoabertura e tipo de orname... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Gloxiniinae have 21 genera and about 160 species. In Brazil, Gloxiniinae has 16 species, distributed in eight genera, three of which are endemic, generally found in rock outcrops of cerrado, rupestrian fields or gallery forests. We studied the pollen grains of ten Brazilian Gloxiniinae (Gesneriaceae) belonging to the genera: Chautemsia A.O.Araujo & V.C.Souza (1 sp.), Gloxinia L'Hér. (3 spp.), Goyazia Taub. (2 spp.), Mandirola Decne. (3 spp.) and Seemannia Regel (1 sp.) with the aim of contributing to the taxonomic characterization of the group and a better delimitation of the genera and/or species, focusing on the Mandirola-Goyazia complex populations. The species of this complex are not well delimited in taxonomic studies and phylogeny works, and this difficulty can be explained by the sympatric distribution, and the floral morphology and phenology very similar. The pollen grains were acetolysed, measured, photographed under light microscopy, scanning and transmission electron microscopy and described qualitatively. The quantitative data were analyzed by descriptive and multivariate statistics. We observed for the Brazilian Gloxiniinae species variations on the amb, shape, length and width colpi, colpi end, margo, endoaperture and ornamentation. For the 36 natural populations of Mandirola and Goyazia, qualitative data such as number and type of apertures, endoaperture, margo, ornamentaion and exine utrastructure are very similar, but we identify differences in amb, shape, le... (Complete abstract click electronic access below)
Mestre
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Landi, Lorrayne Albernaz Domingues Camilo. „Palinotaxonomia em espécies brasileiras do complexo Codonanthe-Codonanthopsis e gêneros relacionados /“. Jaboticabal, 2017. http://hdl.handle.net/11449/151255.
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Orientador: Eduardo Custódio GasparinoCoorientador: Alain Chautems
Banca: Cynthia Fernandes Pinto da Luz
Banca: Claudia Barbieri Ferreira Mendonça
Resumo: Palinotaxonomia em Espécies Brasileiras do complexo Codonanthe- Codonanthopsis (Gesneriaceae) e gêneros relacionados - Será estudada a morfologia dos grãos de pólen de 25 espécies brasileiras dos gêneros Codonanthe (Mart.) Hanst., Codonanthopsis Mansf., Nematanthus Schrad. e Paradrymonia Hanst., distribuídas em sua maioria em dois biomas, Amazônia e Mata Atlântica. O objetivo deste trabalho é contribuir com a caracterização palinológica, em busca de dados morfológicos que possam melhor definir as espécies estudadas, auxiliando dessa forma, o melhor entendimento das relações de parentesco entre os gêneros e na compreensão da distinção florística entre os respectivos biomas. Os grãos de pólen foram acetolisados, medidos e fotografados sob microscopia de luz, microscopia eletrônica de varredura e transmissão. Os dados quantitativos receberam tratamento estatístico e descritivos, adequado ao tamanho das amostras e foram submetidos a uma análise multivariada identificando caracteres polínicos importantes na distinção das espécies. Os resultados obtidos com este estudo confirma a diversidade polínica para a Gesneriaceae, como já relatado na literatura. Os caracteres que mais contribuíram para distinção entre os gêneros, que auxiliarão trabalhos evolutivos futuros, foram a ornamentação dos grãos de pólen e as características de abertura. As espécies de Codonanthe e Codonanthopsis apresentam ornamentação predominantemente microrreticulada, diferente de Paradrymonia e Nematanthus com ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Palynotaxonomy in Brazilian species of Codonanthe-Codonanthopsis complex (Gesneriaceae) and related genera - The morphology of the pollen grains of 25 Brazilian species Codonanthe (Mart.) Hanst., Codonanthopsis Mansf., Nematanthus Schrad. and Paradrymonia Hanst., distributed mostly in two biomes, the Amazon rainforest and Atlantic Forest. The objective of this study is to contribute with the palynological characterization, in search of morphological data that can better define the studied species, a, thus helping, the better understanding of kinship relations between the genera and in the understanding of the floristic distinction between the respective biomes. The pollen grains were acetolysed, measured and photographed under light microscopy, scanning electron microscopy and transmission. The quantitative data were submitted to a multivariate analysis, identifying pollen characters that were important for the species classification. The results obtained with this study confirm the pollen diversity for the Gesneriaceae, as already reported in the literature. The characters that contributed the most to distinguish between the genera, which will help future evolutionary works, were the ornamentation of the pollen grains and the aperture characteristics. The species of Codonanthe and Codonanthopsis present predominantly microreticulate ornamentation, different from Paradrymonia and Nematanthus with pollen grains mostly reticulate. For Paradrymonia, there were no variations in the ornamentation of the apocolpium and mesocolpium of its pollen grains; in Nematanthus we can see a variation in the pattern of ornamentation between the apocolpium and mesocolpium regions (from microreticulate, reticulate to foveolate). Pollen grains with colpate aperture were described for Codonanthopsis, and for Paradrymonia pollen grains colp... (Complete abstract click electronic access below)
Mestre
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Capucho, Liana Carneiro 1984. „Diversidade morfológica de políades em espécies de Mimosoideae (Leguminosae) = Morphological diversity of polyads in Mimosoideae species (Leguminosae)“. [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315571.
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Orientador: Simone de Pádua TeixeiraTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-24T13:42:31Z (GMT). No. of bitstreams: 1 Capucho_LianaCarneiro_D.pdf: 7485279 bytes, checksum: b54a3fba348638fec00612447ae9cdb5 (MD5) Previous issue date: 2014
Resumo: Dentre os diversos tipos de agrupamento polínico, encontrados em 42 famílias de angiospermas, as políades são de interesse especial, pois são registradas para apenas quatro destas famílias e sua ocorrência pode ser associada a uma redução no número de grãos de pólen por antera em uma espécie. Em Leguminosae, a maior em número de espécies e a mais amplamente distribuída dentre as quatro famílias com políades, essas estruturas ocorrem na subfamília Mimosoideae. Este trabalho apresenta dados sobre a origem, o desenvolvimento e a diversidade morfológica das políades, em nível estrutural e ultraestrutural (Capítulo 1); sobre a origem do adesivo polínico em Calliandra brevipes, substância encontrada tipicamente em políades de espécies do gênero; além de dados sobre a origem e desenvolvimento da políade nesta espécie (Capítulo 2, já publicado); a morfologia e fertilidade polínica em espécies poliembriônicas de Inga (Capítulo 3); e um estudo aprofundado da morfologia incomum das políades em Parkia, em nível estrutural e ultraestrutural (Capítulo 4). As políades são estruturas peculiares e ainda muito pouco estudadas, e o presente trabalho vem prover dados essenciais para a compreensão da origem e morfologia destas estruturas, e de sua funcionalidade na reprodução de espécies da subfamília Mimosoideae em Leguminosae. Para um entendimento mais completo acerca da função, valor adaptativo e seleção dessas estruturas, com ocorrência tão restrita a determinados grupos de plantas, estudos acerca da fisiologia do pólen, interação pólen-pistilo e de viabilidade de embriões formados após a fertilização dos óvulos, são requeridos
Abstract: Among all different types of pollen aggregation, reported for 42 angiosperm families, polyads are of great interest, because they are reported for only four of these families and it is associated to a reduction on number of pollen grains per anther in a species. Among those four families, Leguminosae stands out because it is the most species-rich family and widely spread. In Leguminosae, polyads often occur in the subfamily Mimosoideae. This study highlighted new information on the origin, development and morphological diversity of the polyads, employing anatomic and ultrastructural analyses (Chapter 1); origin of pollen adhesive in Calliandra brevipes, sticky substance tipically found in Calliandra polyads, in addition to data on polyad origin and development (Chapter 2, already published); polyad morphology and fertility in polyembrionic species of Inga (Chapter 3); and a meticulous analysis of the peculiar morphology of Parkia polyads (Chapter 4). Polyads are peculiar and still not well-known structures, and this study aims to contribute with essential data for its origin and morphology understanding, and its functionality in the reproduction of species comprised by subfamily Mimosoideae, in Leguminosae. For a more complete understanding on the function, adaptive value and selection of these structures, that are restricted to certain groups of plants, studies are required on the physiology of pollen, pollen-pistil interaction and viability of embryos formed after fertilization of the ovules
Doutorado
Biologia Vegetal
Doutora em Biologia Vegetal
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Albers, Rebecca Faggion. „Síntese e caracterização de compósitos de grafeno/nanopartículas (FePt, Fe3O4) pelo método poliol modificado“. Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-30032016-164856/.
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O grafeno, material com duas dimensões (2D), formado por átomos de carbono hibridizados em sp2, tem atraído muita atenção da comunidade científica devido às propriedades elétricas, térmicas e mecânicas excepcionais que este material apresenta. Nanopartículas (NPs) de metais e de óxidos metálicos têm sido incorporadas sobre a estrutura do grafeno com o objetivo de obter materiais compósitos. Este trabalho teve por objetivo principal desenvolver uma nova rota para a preparação de compósitos de grafeno/NPs metálicas e de óxidos metálicos pelo método do poliol modificado, em etapa única. O óxido de grafeno (GO) foi sintetizado pelo método Hummers modificado e reduzido e esfoliado pelo processo pioliol modificado para obtenção do grafeno. Ajustou-se a metodologia proposta para que o GO obtido pudesse ser utilizado diretamente no meio reacional do processo poliol sem a necessidade de secagem e redispersão. Foram testadas diversas condições de síntese do grafeno variando-se a presença e tipo de surfactante, o solvente e diferentes condições de aquecimento. As variações de síntese permitiram observar que a presença do surfactante oleilamina aumenta a capacidade redutora do sistema e inibe a formação de outras estruturas de carbono além do grafeno e taxas de aquecimento menores favorecem a formação de grafeno em detrimento destas outras estruturas, enquanto patamares de temperatura intermediários levam à formação dessas estruturas secundárias de carbono. As sínteses foram também adaptadas para a obtenção de compósitos de grafeno/NPs de FePt e Fe3O4. Estas sínteses foram realizadas de duas maneiras: com os precursores metálicos e o GO presentes no balão desde o início da síntese e com os precursores metálicos presentes no balão desde o início da síntese e hot injection do GO. Para os compósitos, as sínteses realizadas em benzil éter (BE) favoreceram a formação de partículas. Para os compósitos de grafeno/NPs de Fe3O4, observou-se que a quantidade de precursor de Fe é crucial para a formação das NPs. Os resultados indicaram que a metodologia empregada foi muito eficiente para produção de grafeno e de compósitos de grafeno/NPs em etapa única e o processo poliol se mostrou muito versátil, de maneira que os resultados obtidos indicam que é possível obter compósitos de grafeno com qualquer sistema de NPs que venham a ser sintetizadas pelo processo poliol, apenas pelo ajuste das condições de síntese, em etapa única.Graphene, a two dimensional material, composed only by sp2 hybridized carbon atoms, have attracted much attention of the scientific comunity due to the exceptional electrical, thermal and mechanical properties this material presents. Metallic and metal oxide nanoparticles (NPs) have been incorporated over graphene structure in order to obtain composite materials. The main goal of this work was to develop a new synthetic route to obtain graphene and metallic and metal oxide NPs composites, in one step. Graphene oxide (GO) was sinthesized by the modified Hummers method and exfoliated and reduced by the modified polyol process to obtain graphene. The proposed methodology was adjusted for the obtained GO to be used directly in the polyol process reactional means, not being necessary to dry and to redisperse the material. Several synthesis conditions were tested to obtain graphene, varying the presence of the surfactant and its type, solvent and heating rates. The synthesis diversity let us observe that the presence of oleylamine improved the reducing capacity of the system and it inhibited other carbon structures formation besides graphene. Also, smaller heating rates favor graphene formation to the detriment of these other structures, whereas intermediate temperature plateaus lead to the formation of carbon secondary structures. The synthesis were also adapted in order to obtain graphene/NPs of FePt and Fe3O4 composites. These synthesis were performed in two ways: both metallic precursors and GO present in the flask since the begining of the synthesys and only methalic precursors present in the flask since the begining of the synthsys, with a GO hot injection. Regarding the composites, synthesis performed in benzyl ether (BE) favor the particles formation. And specifically on the graphene/NPs of Fe3O4 composites, it was observed that Fe precursor quantity is decisive on the NPs formation. The results indicated that the employed methodology was very efficient to produce graphene and graphene/NPs composites in one step. And the polyol process proved to be very versatile, thereby the obtained results indicate it\'s possible to obtain graphene/NPs composites, in one step, with any NPs system that can be synthesized by the polyol process, only by adjusting the synthesis condition.
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Silva, Adriana de Castro Correia da. „Produção e qualidade de frutos de pitaya (Hylocereus undatus) /“. Jaboticabal :, 2011. http://hdl.handle.net/11449/96942.
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Orientador: Antonio Baldo Geraldo MartinsBanca: Carlos Ruggiero
Banca: João Alexio Scapare Filho
Resumo: A procura cada vez maior por uma alimentação saudável e balanceada tem levado a um aumento no consumo de frutas e verduras, e a uma maior diversificação pelos consumidores. Em virtude disso, o consumo de frutas exóticas tem aumentado nos últimos anos, destacando-se, entre os produtos comercializados, a pitaya. Por ser uma cultura ainda incipiente no país, há a necessidade de estabelecimento de pesquisas quanto ao seu cultivo para dar suporte aos produtores. Neste sentido, este trabalho foi realizado com o objetivo de realizar a caracterização do ciclo de produção da pitaya vermelha (Hylocereus undatus) na região de Jaboticabal, SP e a frutificação e qualidade de frutos em função da fonte de pólen, do ambiente de cultivo e da época de produção. O experimento foi conduzido em delineamento inteiramente casualizado, em esquema fatorial 3X2X2 (três espécies doadoras de pólen: H. undatus, H. polyrhizus e Selenicereus setaceus, dois ambientes - condução sob tela plástica branca e preta, e duas épocas de polinização: março e abril), com quatro repetições. Observou-se que a emissão de gemas e o florescimento na cultura da pitaya ocorrem com a associação de altas temperaturas e precipitação, havendo constante emissão de botões florais durante os meses de novembro a abril, com pico de florescimento no mês de dezembro. O clone avaliado mostrou-se auto-incompatível, sendo necessária polinização cruzada, com pólen de outras espécies de pitaya para garantir a frutificação. As condições climáticas influenciaram diretamente do desenvolvimento e na qualidade dos frutos obtidos
Abstract: The increasing demand for a healthy and balanced diet has led to an increased on fruits and vegetables expenditure, and greater diversification by the consumer. As a result, consumption of exotic fruits has increased in recent years, especially the dragon fruit. Due of the fact that is a new crop in Brazil country, researches are needed about their cultivation to support their producers. Therefore, this study was conducted with the aim of assess the phenology of red dragon fruit (Hylocereus undatus) on Jaboticabal, Brazil, and the effect of pollen source, environment for cultivation, and time on fruit set and fruit quality. The experimental design was entirely randomized, in a 3 X 2 X 2 (three pollen sources: H. undatus, H. polyrhizus and Selenicereus. setaceus X two environment for cultivation - under plastic screen black or white, X two times of pollination: March and April) factorial arrangement, with 4 replicates. It was observed that the issue of floral buds and the bloom on dragon fruit culture occurs with a combination of high temperatures and rainfall, with constant emission of flower buds during the months from November to April, with peak bloom in December. The clone evaluated demonstrated self-incompatible, requiring cross-pollination with foreign pollen to ensure fruit set. The environmental conditions influences directly on fruit development and quality
Mestre
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Motta, Bruno Cesar Silva. „Estudo do efeito do uso de poliol reciclado nas propriedades mecânicas da espuma rígida de poliuretano“. Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-25082011-135739/.
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O poliuretano (PU) representa um dos grupos mais importantes de polímeros, com uma grande variedade de tipos e alta versatilidade de aplicações. É uma classe de polímeros na qual as unidades formadoras da cadeia polimérica são interligadas por ligações uretânicas, -O(CO)(NH)- . As macromoléculas são formadas pela reação de pré-polímeros contendo grupos terminais hidroxila com di-isocianatos. Quando excesso de diisocianato é empregado, a macromolécula resultante terá, em suas extremidades, grupos isocianato que podem então reagir com diferentes dióis poliméricos para extender adicionalmente as cadeias, ou com trióis para formar ligações cruzadas (Allcock et al., 2003). Devido a alta versatilidade do poliuretano e por ser o principal componente de produtos de alto consumo como colchões e geladeiras, o volume de resíduo de PU gerado é cada vez maior e por se tratar de um termo-fixo sua reciclagem não é um processo simples. O objetivo do presente trabalho é analisar os efeitos do uso de um poliol reciclado através de um processo de glicólise especifico nas propriedades mecânicas de uma espuma rígida de poliuretano. Diversos métodos de glicólise foram analisados da literatura e com base nas informações encontradas uma rota ótima foi proposta/escolhida. O produto gerado foi então caracterizado e utilizado em diferentes proporções em substituição ao poliol base em formulações padrão de espumas rígidas de poliuretano, de forma que os efeitos da adição do mesmo sobre as características finais relevantes da espuma pudessem ser observadas. O processo de reciclagem apresentado no presente estudo mostrou-se um processo efetivo no tratamento de resíduos industriais de espuma de poliuretano rígido, uma vez que o processo é rápido, de custo relativamente baixo e produz um produto final de qualidade comparável ao dos produtos virgens existentes no mercado. A funcionalidade e número de OH superiores do poliol recuperado trazem inclusive melhorias na estrutura mecânica da espuma final obtida a partir do uso do mesmo. A presença de impurezas advindas de reações secundárias mostraram sua influência na alteração da reatividade da reação de formação da espuma de poliuretano, porém este fato pôde ser ajustado através de alterações no nível de catalisadores adicionados a formulação.The polyurethane (PU) represents one of the most important groups of polymers, with very versatile types and applications. It is a class of polymers in which the polymeric chain components are linked by uretanic linkages, -O(CO)(NH)-. The macromolecules are formed by the reaction of pre-polymers containg hydroxyl end groups with di- isocyanates. When excess of Isocyanate is used, the resulting macromolecule will have, in its edges, isocyanate groups that can react with different polymeric diols to extent additionally the chains, or with triols to form cross-linked polymers. (Allcock et al., 2003) The unlimited nature of the components A and B plus the several applications makes the PU one of the most versatile plastics. Due to its high versatility and for being the main component in mass consumption products like refrigerators and mattresses, the volume of PU residues generated is each time higher and once it is a thermoset its recycling methods are not easy. The objective of the present work is analyzing the effects of the use of a recycled polyol obtained through a specific glycolysis process in the mechanical properties of rigid PU foam. Different glycolysis methods were analyzed from previous art and an ideal route was established. The recycled polyol was characterized and used in different proportions in substitution of the conventional polyol in standard formulations for rigid foam production, thus the effects of this substitution could be observed. The proposed recycling process showed to be very effective in the recovering of polyols from PU rigid foam residues, once the process is fast, relatively low cost and produces a final product with equivalent quality of a conventional polyol. The higher functionality and OH number of the recovered polyol brings to the final foam superior mechanical properties. The presence of secondary products like primary amines generated in the process could be noticed by the increase in the reactivity of the formulations using the recycled polyol, although this fact was proved to be manageable through adjustments in the aminic catalyst add to the formulations.
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Iossi, Emerson [UNESP]. „Morfologia floral e maturação fisiológica de sementes de tamareira-anã (Phoenix roebelenii O'Brien) - Arecaceae“. Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/105257.
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Os objetivos dessa pesquisa foram os de estudar a morfologia floral, o ponto de maturidade fisiológica das sementes de Phoenix roebelenii (tamareira-anã) e o período de colheita dos frutos, no qual as sementes apresentem máxima qualidade fisiológica. As flores femininas e masculinas foram esquematizadas com o auxílio de uma câmara clara acoplada ao estereomicroscópio. Os grãos de pólen foram observados e fotografados em microscópio eletrônico de varredura. Os frutos, a partir de sua formação, foram colhidos semanalmente, sendo as determinações feitas em laboratório. Os dados biométricos dos frutos e das sementes foram determinados com auxílio de paquímetro digital. Foram também determinados o teor de água, a matéria verde e a matéria seca dos frutos e das sementes, a porcentagem de germinação e o índice de velocidade de germinação das sementes. As variáveis que apresentaram crescimento em função do tempo foram ajustadas ao modelo logístico e aquelas com tendência decrescente em função do tempo foram ajustadas ao modelo exponencial decrescente. A morfologia das flores masculinas, femininas e dos grãos de pólen de P. roebelenii é bastante homogênea e confiável, podendo ser usada no reconhecimento e identificação dessa espécie, além de fornecer subsídios para estudos da sua biologia floral e reprodutiva. O ponto de maturidade fisiológica das sementes de P. roebelenii ocorreu aos 138 dias após a antese (d.a.a.), podendo o período de colheita ser estendido até os 194 d.a.a.
The objectives of this research were to study the floral morphology and the physiological maturation of Phoenix roebelenii seeds, for the determination of the ideal harvesting time. The pistillate and staminate flowers were schematized with a clear camera coupled to the stereomicroscope, and the pollen grains were documented by means of electronic spin microscope. The fruits, after its formation, were harvested weekly and they were evaluated at laboratory conditions. Biometrical data of the fruits and seeds were obtained. The moisture content, the fresh and dry weight from the fruits and seeds, and the seed germination and the speed of germination index (SGI) were also recorded. The variables which showed growth in function of the time were adjusted to a logistic model and the one's which exhibited a decrescent trend in the function of the time were adjusted to an exponential decrescent model. The morphology of the flowers, and of the pollen grains of P. roebelenii is sufficiently homogeneous and trustworthy, being able to be used for the recognition and identification of this species, besides supplying subsidies studies of its floral and reproductive biology. It was observed that the physiological maturation point of seeds of P.roebelenii occurred at 138 days after anthesis (d.a.a.), and the harvesting period could be extended up to 194 d.a.a.
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Stradolini, Cristiano Jaeger. „S?ntese e caracteriza??o de nanofios de prata atrav?s do processo poliol“. Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/8194.
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During the past few years, nanosized noble metals have attracted much attention due to their unique electrical and physical properties. Among them, silver has been the subject of several studies, by having the highest electrical and thermal conductivity between all metals. For that reason, its one-dimensional nanometric structure (nanowires) has been receiving a lot of attention, due to its potential in the manufacture of devices that offer good electrical conduction and optical transparency. There are several methods of synthesis for the production of these silver nanowires, however the most widely used is the polyol process, due to its simplicity and low cost. Several studies show the influence of different parameters of the polyol process (reaction time, temperature and etc.) on the final morphology of the nanowires. Thus, a well-defined protocol of good practice for obtaining long and thin silver nanowires is required. The main objective of this work is the development of a low cost protocol capable of generating nanowires with great lengths by modifying the polyol process parameters. Variations were also performed in the method of addition of the main synthesis reagent, silver nitrate, and its influence on the final morphology of the silver nanowires was studied. In this work, by using the polyol process, nanowires up to 40 ?m in length were reported, demonstrating the effectiveness of the developed technique and conclusions about the final results were presented.
Ao decorrer dos ?ltimos anos, metais nobres na escala nanom?trica t?m atra?do muita aten??o, devido as suas propriedades el?tricas e f?sicas ?nicas. Dentre eles, a prata vem sendo alvo de diversos estudos, por possuir a maior condutividade el?trica e t?rmica entre todos os metais. Por conta disto, sua estrutura nanom?trica unidimensional (nanofios) vem recebendo muita aten??o, pelo seu potencial na fabrica??o de dispositivos que exijam alta condutividade el?trica e transpar?ncia ?ptica. Atualmente, existem diversos m?todos de s?nteses para a produ??o destes nanofios de prata, por?m o mais utilizado ? o processo poliol, por ser simples e de baixo custo. Diversos estudos demonstram a influ?ncia de diferentes par?metros do processo poliol (tempo de rea??o, temperatura e etc.) sobre a morfologia final dos nanofios. Assim, se faz necess?rio um protocolo bem definido de boas pr?ticas para a obten??o de fios longos e finos. O principal objetivo deste trabalho ? o desenvolvimento de um protocolo de baixo custo capaz de gerar nanofios com grandes comprimentos, atrav?s de altera??es nas vari?veis do processo poliol, como, por exemplo, varia??es no m?todo de adi??o do principal reagente da s?ntese, o nitrato de prata. Foi estudada a sua influ?ncia na morfologia final dos nanofios. Neste trabalho, os resultados finais apresentaram que nanofios de at? 40 ?m de comprimento foram produzidos pelo processo poliol, demonstrando a efic?cia da t?cnica desenvolvida e foram apresentadas as conclus?es acerca dos resultados atingidos.
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Hübner, Jan. „Entwicklung eines neuartigen Gamma-Butyrolacton 1,3-Diolzugangs : Arbeiten zur Totalsynthese der Polyol-Polyen-Antibiotika Roxaticin A, Mycoticin A und Mycoticin B /“. [S.l. : s.n.], 2001. http://www.gbv.de/dms/bs/toc/341522333.pdf.
Der volle Inhalt der QuelleBücher zum Thema "POLKON"
1
Vesterinen, Raili. Turpeen polton päästöt. Espoo: Valtion teknillinen tutkimuskeskus, 1989.
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2
Qodirov, Muqimzhon. Tort polvon: Sheʺrlar. Toshkent: Chŭlpon, 1994.
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3
Polden'. Moskva: Novoe izdatel'stvo, 2007.
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4
Dniprovsʹkyĭ, Ivan. I͡A︡blunevyĭ polon: Vybrani tvory. Kyïv: "Dnipro", 1985.
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Dniprovsʹkyĭ, Ivan. I︠A︡blunevyǐ polon: Vybrani tvory. Kyïv: Dnipro, 1985.
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Ar-Sergi, Vi︠a︡cheslav. Pichi pi no Polkan: Povestʹ. Izhkar: [s.n.], 2005.
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Chuksin, Nikolaĭ. Kosovskiĭ poligon. Moskva: Ėksmo, 2003.
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Poligon: Roman. Moskva: Sov. pisatelʹ, 1986.
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Poligon "Azerbaĭdzhan". Erevan: T︠S︡entr obshchestvennykh svi︠a︡zeĭ, 2011.
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10
Chuksin, Nikolaĭ. Kosovskiĭ poligon. Moskva: EKSMO, 2003.
Den vollen Inhalt der Quelle findenBuchteile zum Thema "POLKON"
1
Ibrahim, Mohamed Ismail, Ali Al-Dousari und Abeer Hassan Al-Saleh. „Pollen in Dust“. In Atlas of Fallen Dust in Kuwait, 177–96. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66977-5_7.
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Abstract Twenty-eight pairs of pollen and aeolian dust traps covering the State of Kuwait were used to obtain seasonal pollen counts of the most eight dominant families during 2009–2011 i.e. Chenopodiaceae, Poaceae (Gramineae), Cyperaceae, Leguminosae (Fabaceae), Cyperaceae, Brassicaceae, Malvaceae, Compositae, and Plantaginaceae. The sampling site locations were chosen to cover all the geomorphological sectors and native vegetation areas in Kuwait. Generally, pollen counts show us a remarkable distinction between the year 2009–2010 and 2010–2011, It is also evident that pollen counts (concentration) vary from season to season. Pollen counts over four seasons for two years (October 2009–August 2011) reveal the presence of two peaks in spring (April–May) and autumn (October–November). Map distribution of pollens in each of the dominant plant families in Kuwait is generated according to seasons showing higher and lower concentrations of dust pollen counts.
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Kellogg, Elizabeth A. „Pollen“. In Flowering Plants. Monocots, 63–67. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15332-2_6.
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Sewell, A. C. „Polyol“. In Springer Reference Medizin, 1914. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_2477.
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Sewell, A. C. „Polyol“. In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49054-9_2477-1.
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Bährle-Rapp, Marina. „Pollen“. In Springer Lexikon Kosmetik und Körperpflege, 435. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_8076.
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Gooch, Jan W. „Polyol“. In Encyclopedic Dictionary of Polymers, 567–68. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9164.
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Gooch, Jan W. „Polyox“. In Encyclopedic Dictionary of Polymers, 568. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9170.
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Wan, Samuel. „Pollen“. In New Masters of Flash, 34–67. Berkeley, CA: Apress, 2001. http://dx.doi.org/10.1007/978-1-4302-5143-9_2.
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Bowman, J. L., J. Dawson, Z. A. Wilson, L. G. Briarty, B. J. Mullingan, S. Craig und A. Chaudhury. „Pollen“. In Arabidopsis, 275–95. New York, NY: Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4612-2598-0_4.
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Chen, Tong, Xiaoqin Wu, Yanmei Chen, Nils Böhm, Jinxing Lin und Jozef Šamaj. „Pollen and Pollen Tube Proteomics“. In Plant Proteomics, 270–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72617-3_17.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "POLKON"
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Rahayu, Wiwik Endah, Atika Romalasari und Nurul Mukminah. „Efektivitas Metode Persilangan Terkendali dalam Menghasilkan Polong dan Biji yang Bernas pada Tanaman Acacia mangium“. In Seminar, Expo dan Diskusi (SEEDs) Perbenihan Nasional 2017. Jember: AGROPROSS, National Conference Proceedings of Agriculture, 2017. http://dx.doi.org/10.25047/agropross.2017.43.
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Acacia mangium adalah jenis tanaman hutan utama. Acacia mangium dapat tumbuh dengan baik, memiliki kualitas serat yang baik, tahan terhadap penyakit dan toleran terhadap tanah-tanah yang miskin unsur hara. Persilangan terkendali merupakan bagian dari program pemuliaan. Studi malai, polong dan metode persilangan terkendali sangat diperlukan dalam mendapatkan hasil yang baik dalam pemuliaan tanaman. Tujuan dari penelitian ini adalah mendapatkan metode persilangan terkendali yang baik dalam menghasilkan polong dan biji yang bernas pada tanaman Acacia mangium. Efektivitas metode persilangan terkendali di lakukan dengan rancangan petak terpisah dengan 4 ulangan, dimana polen sebagai petak utama dan metode persilangan terkendali sebagai anak petak. Hasil penelitian menunjukkan bahwa sumber polen klon 870 dan metode persilangan terkendali sukrosa lebih efektif dalam meningkatkan hasil persilangan terkendali pada tanaman Acacia mangium. Persentase persilangan terkendali mempengaruhi jumlah polong, jumlah biji bernas dan berat biji yang dihasilkan.
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Varricchio, Sergio Luis, und Cristiano De Oliveira Costa. „Sensibilidades de Polos e Zeros em Relação ao Comprimento de Linhas de Transmissão Representadas pelo Modelo de Bergeron“. In Simpósio Brasileiro de Sistemas Elétricos - SBSE2020. sbabra, 2020. http://dx.doi.org/10.48011/sbse.v1i1.2377.
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Neste trabalho é apresentado o cálculo de sensibilidades de polos e zeros em relação ao comprimento de linhas de transmissão (LTs) representadas pelo modelo de Bergeron. Este tipo de informação pode ser útil quando existem dúvidas sobre os valores dos parâmetros de determinadas LTs, ou, em estudos envolvendo contingências, quais LTs devem ser prioritariamente consideradas. A aplicação das sensibilidades de um polo em um estudo de comportamento harmônico é apresentada.
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Danhope-Smith, Stefanie, und Payaal Patel. „Pollen“. In CHI '05 extended abstracts. New York, New York, USA: ACM Press, 2005. http://dx.doi.org/10.1145/1056808.1057103.
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Sanders, Philip. „Polloi“. In ACM SIGGRAPH 2004 Art gallery. New York, New York, USA: ACM Press, 2004. http://dx.doi.org/10.1145/1185884.1185955.
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Nakajima, Akihiko. „Polygon family“. In ACM SIGGRAPH 98 Electronic art and animation catalog. New York, New York, USA: ACM Press, 1998. http://dx.doi.org/10.1145/281388.281972.
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Chida, Hiroshi. „Polygon family“. In the 29th International Conference. New York, New York, USA: ACM Press, 2002. http://dx.doi.org/10.1145/2931127.2931226.
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Budig, Benedikt, Thomas C. van Dijk, Fabian Feitsch und Mauricio Giraldo Arteaga. „Polygon consensus“. In SIGSPATIAL'16: 24th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2996913.2996951.
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Musunuri, Naga, Ian Fischer, Pushpendra Singh, Daniel E. Bunker und Susan Pell. „Fluid Dynamics of Hydrophilous Pollination in Ruppia (Widgeon Grass)“. In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7891.
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The aim of this work is to understand the physics underlying the mechanisms of two-dimensional aquatic pollen dispersal, known as hydrophily, that have evolved in several genera of aquatic plants, including Halodule, Halophila, Lepilaena, and Ruppia. We selected Ruppia maritima, which is native to salt and brackish waters circumglobally, for this study. We observed two mechanisms by which the pollen released from male inflorescences of Ruppia is adsorbed on a water surface: 1) inflorescences rise above the water surface and after they mature their pollen mass falls onto the surface as clumps and disperses as it comes in contact with the surface; 2) inflorescences remain below the surface and produce air bubbles which carry pollen mass to the surface where it disperses. In both cases dispersed pollen masses combined with others under the action of lateral capillary forces to form pollen rafts. The formation of porous pollen rafts increases the probability of pollination since the attractive capillary force on a pollen raft toward a stigma is much larger than on a single pollen grain. The presence of a trace amount of surfactant can disrupt the pollination process as the pollen is not captured or transported on the water surface.
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Bai, Guochao, Shimin Wei, Duanling Li, Qizheng Liao und Xianwen Kong. „A Novel Synthesis Method of Polygon-Scaling Mechanisms“. In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34934.
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A polygon-scaling mechanism is a single DOF (degree-of-freedom) mechanism for scaling a polygon. This paper presents a tetragon-elements based synthesis method of polygon-scaling mechanisms. According to movable conditions of radial scaling elements, four basic tetragon elements (rhombus element, parallelogram element, kite element and general tetragon element) are proposed. For a given polygon, these four types of elements can be selected based on the characteristics of target polygons to construct polygon-scaling mechanisms in a straightforward manner. Using this synthesis method, some planar 1-DOF scaling mechanisms are obtained with the characteristics of retracting and deploying. Their 3D models are also presented to proof the validity of the proposed method. Finally, a table of tetragon elements with the characteristics of their associated polygon-scaling mechanisms is summarized using which polygon-scaling mechanisms can be easily constructed.
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Castaneda, Juan Andres. „Pollo“. In ACM SIGGRAPH ASIA 2009 Computer Animation Festival. New York, New York, USA: ACM Press, 2009. http://dx.doi.org/10.1145/1665208.1665265.
Der volle Inhalt der QuelleBerichte der Organisationen zum Thema "POLKON"
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Schaub, Hanspeter, und Chris C. Wilson. Matching a statistical pressure snake to a four-sided polygon and estimating the polygon corners. Office of Scientific and Technical Information (OSTI), Mai 2004. http://dx.doi.org/10.2172/974881.
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Bruno, Thomas J., Tara J. Fortin, Marcia L. Huber, Arno Laesecke, Eric W. Lemmon, Elisabeth Mansfield, Mark O. McLinden et al. Thermophysical properties of polyol ester lubricants. Gaithersburg, MD: National Institute of Standards and Technology, August 2019. http://dx.doi.org/10.6028/nist.ir.8263.
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Kim, Alice. Hanbok and Polka Dots. Ames: Iowa State University, Digital Repository, 2014. http://dx.doi.org/10.31274/itaa_proceedings-180814-1039.
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Wilson, John E. Polygon Subtraction in 2 or 3 Dimensions. Office of Scientific and Technical Information (OSTI), Oktober 2013. http://dx.doi.org/10.2172/1131385.
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Hills, R. G., P. D. Meyer und M. L. Rockhold. PolyRES: A polygon-based Richards equation solver. Office of Scientific and Technical Information (OSTI), Dezember 1995. http://dx.doi.org/10.2172/179180.
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Lagera, Anjela J., Lloyd O. Balinado, John Rex Baldomero, Hannah Fae I. Rotairo, Nariza L. Tero, Mailyn S. Maghinay, Irma F. Baluyo et al. Varying Sugars and Sugar Concentrations Influence In Vitro Pollen Germination and Pollen Tube Growth of Cassia alata L. Journal of Young Investigators, Juni 2017. http://dx.doi.org/10.22186/jyi.33.1.42-45.
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Fung, Khun Y., Tina M. Nicholl, Robert E. Tarjan und Christopher J. Van Wyk. Simplified Linear-Time Jordan Sorting and Polygon Clipping. Fort Belvoir, VA: Defense Technical Information Center, Juli 1989. http://dx.doi.org/10.21236/ada215110.
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Staiger, C. J. Identification of Actin-Binding Proteins from Maize Pollen. Office of Scientific and Technical Information (OSTI), Januar 2004. http://dx.doi.org/10.2172/820708.
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Brooks, G. R., und A. Grenier. Late Holocene pollen stratigraphy of Lake Louise, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/212115.
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Busch, Robert D., Karl E. Scheuch und Thomas T. Shishman. Fort Polk EEAP. Fort Belvoir, VA: Defense Technical Information Center, Juli 1986. http://dx.doi.org/10.21236/ada330503.
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