Gotowe bibliografie tematyczne / Dacus

Gotowa bibliografia na temat „Dacus”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Dacus"

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Drew, R. A. I., D. L. Hancock i I. M. White. "Revision of the tropical fruit flies (Diptera : Tephritidae : Dacinae) of South-east Asia. II. Dacus Fabricius". Invertebrate Systematics 12, nr 4 (1998): 567. http://dx.doi.org/10.1071/it96004.

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A total of 44 species are placed in the genus Dacus inSouth-east Asia and divided amongst four subgenera, viz.Callantra Walker, Dacus Fabricius,DidacusCollart and LeptoxydaMacquart. In all, 27 species are revised and the following 17 new speciesdescribed: Dacus (Callantra)ambonensis, D.(C.) atrimarginatus,D. (C.)calirayae, D.(C.)feijeni,D. (C.)insulosus, D.(C.) lagunae,D. (C.)leongi, D.(C.) maculipterus,D. (C.)murphyi, D.(C.) nanggalae,D. (C.)ooii, D.(C.) ramanii,D.(C.)siamensis,D. (C.)tenebrosus, D.(C.) vijaysegarani,D. (C.)wallacei, Dacus(Dacus) santongae. A key tospecies within the genus Dacus is presented based oncharacters that bypass subgeneric groupings, because of the presentuncertainty of subgeneric limits. Information is given on location of typespecimens, host plants, attractant records and geographic distributions.Lectotypes are designated for D. conopsoides de Meijere, D. esakii (Shiraki),D. icariiformis Enderlein andD. persicus Hendel. Thirteen new synonymies withinDacus are established:Callantra ihai Shiraki [ofDacus esakii (Shiraki)];Callantra smieroides Walker,Mellesis destillatoria Bezzi,Mellesis eumenoides Bezzi,Mellesis bioculata Bezzi,Callantra unifasciatus Hardy,Callantra variegata Wang (all ofDacus longicornis Wiedemann);Mellesis apicalis Shiraki [ofDacus nummularius(Bezzi)];Callantra munroi Zaka-ur-Rab,Callantra nepalensis Hardy,Callantra quadristriata Munro [all ofDacus polistiformis (Senior-White)];Callantra ziae Wang [ofDacus satanas (Hering)];Dacus cocciniae Premlata & Awtar Singh (ofDacus ciliatus Loew).Dacus persicus Hendel is removed from synonymy withD. longistylus Wiedemann.Sinodacus fuscans Wang is placed as a new synonym ofBactrocera brachycera(Bezzi).
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DAVID, K. J., K. SACHIN i D. L. HANCOCK. "TWO NEW SPECIES AND A NEW RECORD OF DACUS FABRICIUS (DIPTERA: TEPHRITIDAE) FROM INDIA". Zootaxa 4743, nr 4 (27.02.2020): 553–60. http://dx.doi.org/10.11646/zootaxa.4743.4.5.

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Two new species of the genus Dacus Fabricius, namely D. (Mellesis) jacobi David & Sachin and D. (Mellesis) viraktamathi David & Hancock of tribe Dacini are described from India. Dacus (Mellesis) maculipterus White is recorded for the first time from India. An updated key to species of genus Dacus from India, Bhutan and Sri Lanka is also provided.
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DAVID, K. J., i S. RAMANI. "New species, redescriptions and phylogenetic revision of tribe Dacini (Diptera: Tephritidae: Dacinae) from India based on morphological characters". Zootaxa 4551, nr 2 (30.01.2019): 101. http://dx.doi.org/10.11646/zootaxa.4551.2.1.

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The tribe Dacini comprising four genera, namely Bactrocera Macquart, Dacus Fabricius, Monacrostichus Bezzi and Zeugodacus Hendel, is a derived lineage in Tephritidae. It is one of the most economically important tribes in Tephritidae harbouring several species of quarantine concern across the world. We describe two new species of Bactrocera Macquart, B. (Parazeugodacus) conica David & Ramani, sp. n. & B. (B.) prabhui David, sp. n. from India. Postabdominal structures of males and/or females of 23 species of Bactrocera, 16 species of Zeugodacus and 8 species of Dacus from India are illustrated and described for the first time, which revealed similarities between Dacus and Zeugodacus with respect to epandrial shape and praeputium patterning. Bactrocera is unique in possessing oval shaped epandrium and an unpatterned praeputium. An analysis of phylogenetic relationships between three genera of the tribe Dacini from India based on morphological characters has been attempted for the first time. Cladistic analysis employing 51 characters of 62 species in Dacini, with seven species as outgroups revealed the monophyly of Dacini, Bactrocera and Dacus with supporting nonhomplasious synapomorphies. Ichneumonopsis Hardy, often included in the Gastrozonini, does not possess any synapomorphies of Dacini, eventhough it appeared at the base of the Dacini clade. Zeugodacus was retrieved as a monophyletic sister-group to Dacus based solely on a single homoplasious host plant character, with weak statistcal support.
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Qureshi, Z. A., T. Hussain i Q. H. Siddiqui. "Interspecific competition of Dacus cucurbitae Coq. and Dacus ciliatus Loew in mixed infestation of cucurbits". Journal of Applied Entomology 104, nr 1-5 (12.01.1987): 429–32. http://dx.doi.org/10.1111/j.1439-0418.1987.tb00544.x.

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Zisopoulou, Stavroula A., Christina K. Chatzinikolaou, John K. Gallos, Anna Ofrydopoulou, Dimitra A. Lambropoulou, Eleni Psochia, Dimitrios N. Bikiaris i Stavroula G. Nanaki. "Synthesis of Dacus Pheromone, 1,7-Dioxaspiro[5.5]Undecane and Its Encapsulation in PLLA Microspheres for Their Potential Use as Controlled Release Devices". Agronomy 10, nr 7 (21.07.2020): 1053. http://dx.doi.org/10.3390/agronomy10071053.

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Olive fruit fly Dacus oleae is a well-known pest infecting the bark of olive fruit, leading to reduction of extracted olive oil properties. Among chemicals proposed for Dacus oleae population control, pheromone 1,7-dioxaspiro(5.5)undecane (DSU), Dacus pheromone, is considered as a promising agent, which is added in several traps. However, all proposed systems manage to sufficiently deliver DSU for only two weeks. Furthermore, an additional problem is the limited available amount of pheromone to use in such systems. To overcome this, in the present study, a novel synthetic procedure of DSU is described, including only five steps. Intermediate products were studied by High Resolution Mass Spectroscopy Electrospray Ionization (HRMS-ESI) (m/z), while the resulting DSU was further characterized by 1H and 13C-NMR. Synthesized DSU was further encapsulated in poly(L-lactic acid) (PLLA) microparticles in three different concentrations; 5, 10 and 20% w/w. Its successful incorporation was studied by FT-IR, XRD and differential scanning calorimeter (DSC) while two procedures, liquid extraction and solid phase microextraction, followed by GC-MS analysis, was used for quantification of pheromone to microparticles. It was found that microparticles loading was over 85% for all three formulations. Its release showed a prolonged profile for microparticles containing 20% w/w DSU, lasting four weeks, while the quantity of DSU released reached 100%. These microparticles could be appropriate to control Dacus oleae population.
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Kalamatianos, Romanos, Ioannis Karydis, Dimitris Doukakis i Markos Avlonitis. "DIRT: The Dacus Image Recognition Toolkit". Journal of Imaging 4, nr 11 (30.10.2018): 129. http://dx.doi.org/10.3390/jimaging4110129.

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Modern agriculture is facing unique challenges in building a sustainable future for food production, in which the reliable detection of plantation threats is of critical importance. The breadth of existing information sources, and their equivalent sensors, can provide a wealth of data which, to be useful, must be transformed into actionable knowledge. Approaches based on Information Communication Technologies (ICT) have been shown to be able to help farmers and related stakeholders make decisions on problems by examining large volumes of data while assessing multiple criteria. In this paper, we address the automated identification (and count the instances) of the major threat of olive trees and their fruit, the Bactrocera Oleae (a.k.a. Dacus) based on images of the commonly used McPhail trap’s contents. Accordingly, we introduce the “Dacus Image Recognition Toolkit” (DIRT), a collection of publicly available data, programming code samples and web-services focused at supporting research aiming at the management the Dacus as well as extensive experimentation on the capability of the proposed dataset in identifying Dacuses using Deep Learning methods. Experimental results indicated performance accuracy (mAP) of 91.52% in identifying Dacuses in trap images featuring various pests. Moreover, the results also indicated a trade-off between image attributes affecting detail, file size and complexity of approaches and mAP performance that can be selectively used to better tackle the needs of each usage scenario.
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Nezis, Ioannis P., Dimitrios J. Stravopodis, Lukas H. Margaritis i Issidora S. Papassideri. "Follicular atresia during Dacus oleae oogenesis". Journal of Insect Physiology 52, nr 3 (marzec 2006): 282–90. http://dx.doi.org/10.1016/j.jinsphys.2005.11.007.

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Vargas, Roger I., i Toshiyuki Nishida. "Survey for Dacus latifrons (Diptera: Tephritidae)". Journal of Economic Entomology 78, nr 6 (1.12.1985): 1311–14. http://dx.doi.org/10.1093/jee/78.6.1311.

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Mora-Márquez, Ana María. "Martinus Dacus and Boethius Dacus on the Signification of Terms and the Truth-Value of Assertions". Vivarium 52, nr 1-2 (27.02.2014): 23–48. http://dx.doi.org/10.1163/15685349-12341268.

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Abstract The article intends to show: a) that the modist Martin of Dacia sides with the traditional reading of the first chapter of Aristotle’s De interpretatione that we find in masters of arts from the first half of the thirteenth century; and b) that the modist Boethius of Dacia is one of the first thirteenth-century scholars to depart from this reading. In fact, Boethius presents us with an account of propositional verification where the terms’ signification is not operational and where the immediate truth-maker of statements like ‘homo est animal’ is an external state of affairs. In Martin’s case, to the contrary, the terms’ signification is operational in his account of propositional verification and the immediate truth-bearer of such statements is a mental composition or division.
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Baker, R., i A. J. Bacon. "The identification of spiroacetals in the volatile secretions of two species of fruit fly (Dacus dorsalis, Dacus curcurbitae)". Experientia 41, nr 11 (listopad 1985): 1484–85. http://dx.doi.org/10.1007/bf01950049.

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Rozprawy doktorskie na temat "Dacus"

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Karunaratne, Swinitha. "Behaviour of the oriental fruit fly, Dacus dorsalis Hendel (Diptera: Tephritidae)". Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293598.

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Elghadi, Esam Omar Ahmed. "Entomopathogenic fungi as a biological control for the Greater melon fly Dacus frontalis (Becker) (Diptera: Tephritidae)". Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3352.

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The Greater melon fly Dacus frontalis is one of the most economically damaging pests of cucurbit fruits in Africa. The aim of this study was to evaluate entomopathogenic fungi for use against D. frontalis and develop better strategies in using these biological agents for integrated fly management. Laboratory experiments were conducted to evaluate the pathogenicity of some commercial biopesticides based on several strains of entomopathogenic fungi against different life stages of the fly. Met52 Granular biopesticide (MET52) based on Metarhizium anisopliae caused the greatest pathogenicity to the adults. Therefore, MET52 was selected for further investigation. Pupal age and an increasing rate of MET52 had no effect on pupal mortality. However, post-emergence mortality increased when the fungus was applied on young pupae. Prior application of MET52 in a granule form caused considerable mortality to larval-pupal stages compared with a drench application. A sublethal effect of MET52 infection, reducing adult reproduction, was found. The fungus was more effective when applied as a granule in soil against emerging adults than as a direct spray against adults. MET52 fungus was able to persist in soil, reducing the adult emergence and subsequent fly population for more than two months after a single application, and also inducing new infections among the fly population. Percentage mortality of untreated females mating with inoculated males was greater than that of untreated males mating with inoculated females. The infection reduced the adult’s reproduction resulting in a considerable reduction in pupae recovered in the fungal treatments. Alone or in combination with MET52 neem had a dose-dependent effect on larval mortality and induced various effects on soil stages and adults of the fly. The efficacy of the fungus increased considerably at low concentration of neem showing the shortest LT50. In field cage trials, baited McPhail traps with yeast hydrolysate enzymatic had the greatest number of D. frontalis. MET52 gave lower adult mortality than insecticide. In conclusion, soil application of MET52 can be a promising effective control of D. frontalis, and can be combined with other control agents providing a possible effective strategy for integrated fly management.
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Raghu, Sathyamurthy, i n/a. "The Autecology of Bactrocera cacuminata (Hering) (Diptera:Tephritidae:Dacinae): Functional Significance of Resources". Griffith University. Australian School of Environmental Studies, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030605.162831.

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This thesis investigated the autecology of the dacine species, Bactrocera cacuminata (Hering) (Diptera: Tephritidae: Dacinae). I specifically focused on the adult phase of the life cycle and resources believed to be significant to this life stage. The prevailing paradigm in dacine ecology predicts that the larval host plant serves as the centre of dacine activity, a state mediated by mutualistic associations with fruit fly-type bacteria. Contrary to predictions, an explicit test of this hypothesis found that the host plant of B. cacuminata, Solanum mauritianum Scopoli, acted almost exclusively as a site for oviposition and larval development. Other key adult behaviours, most notably feeding and mating, were rare at the host plant. Even in disturbed habitats, the paucity of key adult behaviours such as mating was striking. Adult flies of this species were therefore hypothesized to be utilizing other components of their habitat, i.e. resources vital to their life history requirements. Some of the resources that B. cacuminata are known to respond to include sugar, protein, methyl eugenol and the host plant. The latter three resources are believed to be critical in the reproductive success of dacine flies in general. I assessed the physiological status of flies arriving at these resources to determine if flies of different status foraged for resources differently. In dacines, the internal reproductive structures of the male and female flies have been used as predictors of physiological status. I quantified expansion of the male ejaculatory apodeme in B. cacuminata with age of fly and found that there is a threshold apodeme size that is strongly correlated Abstract with sexual maturity. Maturity of female flies could be accurately predicted by ovarian development. Using these methods to assess the physiological and nutritional status of flies arriving at resources (larval host plant, protein and methyl eugenol) in the field, I discovered that only sexually mature and mated females were responding to the host plant, while the males at the host plant were sexually immature. This confirmed the hypothesis that the host plant primarily served as an oviposition site. Additionally, this study revealed that sexually mature males with high nutritional reserves were most commonly collected at methyl eugenol (a plant-derived chemical that elicits a strong response in males of many dacine species) at dusk, the time of peak sexual activity in this species. This indicated that methyl eugenol was perhaps a significant resource in the context of the reproductive behaviour of this species. Methyl eugenol (ME) is one of group of phenyl propanoids to which males of certain species of Dacinae respond. The current hypothesis of the role of these phenyl propanoids is that they function as pheromone precursor chemicals. Response to these chemicals is hypothesized to be a trait under sexual selection. In Bactrocera dorsalis (Hendel), this effect is so strong that a single feeding on ME results in a strong mating advantage up to a month after males feed on the chemical. Bactrocera cacuminata fed on multiple occasions on ME in a laboratory bioassay. After a single 24-hour exposure to ME, investigations of mating competitiveness did not reveal any obvious advantage for ME-fed males over unfed males. However, ME-fed males did enjoy a higher mating success 16 and 32 days after exposure to the chemical, suggesting that some physiological benefits unrelated to the pheromone synthesis was driving this delayed advantage. Investigation of the physiological consequences of feeding on ME revealed no enhancement of nutritional or energetic reserves, suggesting that the delayed mating advantage observed was more likely a chance event. An alternate hypothesis about the proximate function of ME, proposed by Robert Metcalf, is that it serves as a mate rendezvous site. As mating behaviour was notably absent at the host plant, I tested Metcalf’s hypothesis. A field-cage experiment, spatially separating adult resources (host plant, methyl eugenol, sugar and protein) clearly demonstrated that methyl eugenol was functioning as a mate rendezvous stimulus for B. cacuminata. This is the first direct support for Metcalf’s hypothesis. A synthesis of the literature revealed that significantly greater ecological and evolutionary information was required to understand the basis of dacine response to phenyl propanoids. Different dacine species may be utilizing these chemicals differently, even if their evolutionary origin may have been as a plant based kairomone. My studies show that generalizations on the ecology and behaviour of Dacinae, often extrapolated from research on a few pest species, do not hold up in the case of B. cacuminata. This suggests that a more autecological, species-specific approach is required in dacine research, before any predictive generalizations can be made.
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Raghu, Sathyamurthy. "The Autecology of Bactrocera cacuminata (Hering) (Diptera:Tephritidae:Dacinae): Functional Significance of Resources". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366116.

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This thesis investigated the autecology of the dacine species, Bactrocera cacuminata (Hering) (Diptera: Tephritidae: Dacinae). I specifically focused on the adult phase of the life cycle and resources believed to be significant to this life stage. The prevailing paradigm in dacine ecology predicts that the larval host plant serves as the centre of dacine activity, a state mediated by mutualistic associations with fruit fly-type bacteria. Contrary to predictions, an explicit test of this hypothesis found that the host plant of B. cacuminata, Solanum mauritianum Scopoli, acted almost exclusively as a site for oviposition and larval development. Other key adult behaviours, most notably feeding and mating, were rare at the host plant. Even in disturbed habitats, the paucity of key adult behaviours such as mating was striking. Adult flies of this species were therefore hypothesized to be utilizing other components of their habitat, i.e. resources vital to their life history requirements. Some of the resources that B. cacuminata are known to respond to include sugar, protein, methyl eugenol and the host plant. The latter three resources are believed to be critical in the reproductive success of dacine flies in general. I assessed the physiological status of flies arriving at these resources to determine if flies of different status foraged for resources differently. In dacines, the internal reproductive structures of the male and female flies have been used as predictors of physiological status. I quantified expansion of the male ejaculatory apodeme in B. cacuminata with age of fly and found that there is a threshold apodeme size that is strongly correlated Abstract with sexual maturity. Maturity of female flies could be accurately predicted by ovarian development. Using these methods to assess the physiological and nutritional status of flies arriving at resources (larval host plant, protein and methyl eugenol) in the field, I discovered that only sexually mature and mated females were responding to the host plant, while the males at the host plant were sexually immature. This confirmed the hypothesis that the host plant primarily served as an oviposition site. Additionally, this study revealed that sexually mature males with high nutritional reserves were most commonly collected at methyl eugenol (a plant-derived chemical that elicits a strong response in males of many dacine species) at dusk, the time of peak sexual activity in this species. This indicated that methyl eugenol was perhaps a significant resource in the context of the reproductive behaviour of this species. Methyl eugenol (ME) is one of group of phenyl propanoids to which males of certain species of Dacinae respond. The current hypothesis of the role of these phenyl propanoids is that they function as pheromone precursor chemicals. Response to these chemicals is hypothesized to be a trait under sexual selection. In Bactrocera dorsalis (Hendel), this effect is so strong that a single feeding on ME results in a strong mating advantage up to a month after males feed on the chemical. Bactrocera cacuminata fed on multiple occasions on ME in a laboratory bioassay. After a single 24-hour exposure to ME, investigations of mating competitiveness did not reveal any obvious advantage for ME-fed males over unfed males. However, ME-fed males did enjoy a higher mating success 16 and 32 days after exposure to the chemical, suggesting that some physiological benefits unrelated to the pheromone synthesis was driving this delayed advantage. Investigation of the physiological consequences of feeding on ME revealed no enhancement of nutritional or energetic reserves, suggesting that the delayed mating advantage observed was more likely a chance event. An alternate hypothesis about the proximate function of ME, proposed by Robert Metcalf, is that it serves as a mate rendezvous site. As mating behaviour was notably absent at the host plant, I tested Metcalf’s hypothesis. A field-cage experiment, spatially separating adult resources (host plant, methyl eugenol, sugar and protein) clearly demonstrated that methyl eugenol was functioning as a mate rendezvous stimulus for B. cacuminata. This is the first direct support for Metcalf’s hypothesis. A synthesis of the literature revealed that significantly greater ecological and evolutionary information was required to understand the basis of dacine response to phenyl propanoids. Different dacine species may be utilizing these chemicals differently, even if their evolutionary origin may have been as a plant based kairomone. My studies show that generalizations on the ecology and behaviour of Dacinae, often extrapolated from research on a few pest species, do not hold up in the case of B. cacuminata. This suggests that a more autecological, species-specific approach is required in dacine research, before any predictive generalizations can be made.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Australian School of Environmental Studies
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Velcescu, Leonard. "Dacii în sculptura romană : studiu de iconografie antică /". [Saint-Estève] : Éd. les Presses littéraires, 2008. http://catalogue.bnf.fr/ark:/12148/cb41409794k.

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Rosa, Juliana Gomes. "Secagem de cenoura (Daucus carota L.) em microondas". Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/4039.

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Carrot is a root plant of the same name, Daucus carota L.. This vegetable has a high consumption and its use as an ingredient in the formulation of industrial products has increased in recent years. The main appeal of the carrot is its high content of β-carotene. During harvest the carrots have 80 to 90% humidity and this high moisture content makes it a product with a short shelf life. Drying is an alternative to increase the shelf life of carrot. In addition, a drying operation is required to prepare the plant to participate in various formulations of industrial products. The study of carrot drying has been performed in several dryers and the quality of the product related to different processes. Drying in a microwave dryer has stood out in the drying of food, as its heating mode is different from conventional drying by hot air. Microwave drying can improve the quality of the final product. The purpose of this study is to analyze the drying of carrots in a microwave dryer, to evaluate the quality of the final product and to check whether the combination of vacuum drying will lead to an increase in the quality of the dried carrots. The monitoring of the kinetics of microwave drying and microwave vacuum drying was conducted and the relationship between the kinetics and process conditions, such as the carrot shape and the power used, was investigated. The influence of such processes in the characteristics of the final product was evaluated by determining the apparent density, real density, porosity, shrinkage, total β- carotene and rehydration. Also the desorption isotherms of carrots were determined at temperatures of 40°C and 50°C. The data of drying kinetics and desorption isotherms were fitted to models suggested in the literature in order to describe these processes. The results showed that the drying rate of carrot in a microwave dryer was affected by the carrot shape. The content of β-carotene was reduced with the increase of power applied. The microwave drying in vacuum produced carrots with higher porosity and lower shrinkage, but this characteristic was not reflected in the ability of rehydration, which was independent of the drying process. Of the models fitted to the experimental results, the Page model gave the best fit to the kinetics of drying and Peleg model gave the best fit to the kinetics of rehydration of carrots dried in a microwave dryer and a microwave drying in vacuum.
Cenoura é a raiz da planta de mesmo nome, Daucus carota L.. Este vegetal apresenta elevado consumo in natura e a sua utilização como ingrediente na formulação de produtos industrializados tem se elevado nos últimos anos. O principal atrativo da cenoura é o seu alto teor de β-caroteno. No momento da colheita a cenoura tem entre 80 e 90% de umidade e este alto teor de umidade a torna um produto com pequena vida de prateleira. Para aumentar a vida de prateleira da cenoura, a secagem é uma alternativa; além de ser necessária para preparar este vegetal para participar de diversas formulações em produtos indutrializados. O estudo da secagem de cenoura tem sido realizado em diversos secadores e a qualidade do produto obtido relacionada aos diferentes processos. A secagem em secador de microondas tem se destacado na secagem de alimentos, pois o seu modo de aquecimento é diferente da secagem convecional por ar quente, o que pode melhorar a qualidade do produto final obtido. Este estudo, então, tem como objetivo a análise da secagem de cenoura em microondas e também a avaliação da qualidade final do produto obtido e a verificação se a associação de vácuo a este modo de secagem gera aumento na qualidade da cenoura seca. Para tanto o acompanhamento da cinética de secagem em microondas e em microondas a vácuo foi realizado, bem como a relação entre esta cinética e as condições do processo, como a forma de corte e a potência utilizada. A influência do processo na qualidade do produto final foi avaliada através da determinação da densidade aparente, densidade real, porosidade, encolhimento, teor de β-caroteno e características de reidratação. Foram determinadas as isotermas de dessorção da cenoura às temperaturas de 40°C e 50°C. Os dados de cinética de secagem e das isotermas de dessorção foram ajustados a modelos sugeridos na literatura a fim de se descrever estes processos. Os resultados obtidos mostraram que a velocidade de secagem de cenoura em microondas foi influenciada pela forma de corte da amostra. Além disso, a associação ao vácuo resulta em um menor encolhimento e produto final mais poroso, porém estas características não foram garantia de melhor capacidade de reidratação. A degradação do β-caroteno aumentou com o aumento da potência utilizada. Dentre os modelos utilizados, o modelo de Page foi o que melhor descreveu a cinética de secagem e o modelo de Peleg foi o que melhor descreveu a cinética de reidratação de cenouras submetidas aos dois modos de secagem, microondas e microondas a vácuo.
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Almeida, Karina de [UNESP]. "Adubos verdes na produção de alface e cenoura, sob sistema orgânico". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/103241.

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O presente trabalho objetivou estudar o efeito das plantas de cobertura crotalária (Crotalaria juncea), feijão-guandu (Cajanus cajan), feijão-de-porco (Canavalia ensiformes), milho (Zea mays), milheto (Pennisetum glaucum) e mucuna-preta (Mucuna aterrimum), em cultivo exclusivo e consorciado, e vegetação espontânea, no desempenho agronômico de alface (Lactuca sativa) e cenoura (Daucus carota) cultivadas em sistema orgânico. Para tanto, foram conduzidos três experimentos, sendo um referente à seleção das espécies utilizadas como adubo verde. O primeiro e segundo, determinaram as quantidades de palhada para a formação de cobertura morta, além da decomposição e liberação de nutrientes das palhadas. O terceiro, o efeito do pré-cultivo de leguminosas e gramíneas no rendimento de alface e cenoura cultivadas em sistema orgânico. O delineamento utilizado nos dois primeiros experimentos foi o de blocos casualizados com quatro repetições, e o terceiro experimento em esquema de parcelas divididas (alface e cenoura). Nos estudos da decomposição e liberação de nutrientes das palhadas foi utilizado o método da “litter bags”. Conclui-se que o feijão-deporco em cultivo exclusivo apresentou maior produtividade de massa fresca, que os demais adubos verdes, e juntamente com o coquetel completo, maior produtividade de massa seca e acúmulo de nutrientes para a cenoura e alface. O uso de adubos verdes em pré-cultivo das oleráceas manteve a produtividade da cenoura semelhante à testemunha.Dentre as espécies utilizadas, o feijão-de-porco em cultivo exclusivo proporcionou melhor rendimento comercial da alface. Pelos resultados dos experimentos, detectou-se que a adubação verde é uma prática promissora para a produção orgânica de alface e cenoura.
The present work objectived to study the effect of cover crops with Crotalaria juncea, Cajanus cajan, Canavalia ensiformes, Zea may, Pennisetum glaucum, and Mucuna aterrimum, in single and associated cultivation and spontaneous vegetation, in the agronomic performance of lettuce (Lactuca sativa) and carrot (Daucus carota) under organic system. Three experiments were conducted, the first one referring to the selection of the species used as green manure. First and second experiments determined the amounts of straw production of phytomass, besides the decomposition and nutrient release of the straws. The third one, the effect of the legumes and grasses pre-cultivation in the lettuce and carrot yields under organic system. The experimental design was a randomized block with four repetitions in the two first tests and the third test a split-splot (lettuce and carrot). In the studies about decomposition and nutrient release of the straws it was used the method of litter bags. It was concluded that Canavalia ensiformes in single cultivation shows higher productivity of fresh mass than other green manure and in complex with the complete cocktail, higher productivity of dry mass and nutrient accumulated for carrot and lettuce. The use of the green manure in pre-cultivation of the vegetables maintained the carrot productivity similar to the no-treated. Among the species of green manure Canavalia ensiformes in single cultivation promoted the best commercial yields of lettuce. By the results, it was detected that the green manure is a promising practice to the organic production of lettuce and carrot.Key words: green manures, legumes, Lactuca sativa, Daucus carota.
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Jörgensen, Sofie. "Modelling of Power Dissipation in CMOS DACs". Thesis, Linköping University, Department of Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1329.

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In this master thesis work, the power dissipation in a current-steering digital- to-analog converter, DAC, has been studied. The digital as well as the analog power dissipation have been modelled in MATLAB and it is shown that the MATLAB models agrees well with simulation results from the circuit simulator (Spectre).

A case study on a DAC designed at Ericsson Microelectronics AB in Linköping has also been done. The DAC is a thermometer-coded current-steering DAC suitable for telecommunications applications. The telecommunication standards that have been studied are asymmetric digital subscriber line, ADSL, very high speed data digital subscriber line, VDSL, and, wireless local area network, WLAN. The conlusion of the study is that the power dissipation of the specific DAC, used in ADSL applications, 75mW, is far from optimized. It can theoretically be lowered to 3.5mW.

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Carneiro, Gabriella Daier Oliveira Pessoa. "Ácido salicílico e sacarose na redução de estresse causado pelo metribuzin na cultura da cenoura". Universidade Federal de Viçosa, 2016. http://www.locus.ufv.br/handle/123456789/8232.

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O sistema produtivo de cenoura (Daucus carota L.) é realizado durante todo o ano no Brasil. Um aspecto importante sobre o cultivo dessa hortaliça são as plantas daninhas, que se não manejadas adequadamente, podem inviabilizar economicamente a atividade. Entretanto, o reduzido número de herbicidas registrados para a cultura é um fator limitante. Neste sentido, o metribuzin apresenta potencial, apesar de relatos de intoxicação na cultura da cenoura. Por outro lado, substâncias com capacidade de promover respostas adaptativas nas plantas podem ser utilizadas como protetores dos efeitos de herbicidas não seletivos. O objetivo dessa pesquisa foi avaliar o uso do metribuzin na cultura da cenoura e dos protetores - sacarose e ácido salicílico (AS). Para isso foram realizados três experimentos de campo no delineamento de blocos casualizados, com quatro repetições, em duas épocas. No primeiro, os tratamentos constituíram de doses de metribuzin: 0, 144, 288, 432, 576, 720, 960 e 1200 g ha-1. No segundo, avaliou-se o potencial de uso da sacarose nas modalidades cinco dias antes da aplicação do herbicida (5DAA), em mistura de calda com o herbicida (0), cinco dias após a aplicação do herbicida (5DDA) e sem aplicação do protetor (SA) e no terceiro do ácido salicílico. Aos 30 dias após a aplicação (DAP) foi avaliada a matéria seca da parte aérea (MSPA) e aos 120 DAP a produtividade para os três experimentos. A aplicação de metribuzin até 432 g ha-1 não causou redução da produtividade da cenoura. A solução de sacarose proporcionou aumento da MSPA da cultivar Nayarit, mesmo na presença do metribuzin, entretanto, o mesmo não foi observado para a cultivar Verano. Em relação à produtividade, não houve influência da utilização da sacarose. A aplicação exógena de AS aumentou a MSPA em relação a ausência de AS e presença de metribuzin, e também igualou a MSPA em relação aos tratamentos com ausência do herbicida. Não houve aumento da produtividade total com a aplicação do AS, todavia, houve um aumento da produtividade de cenouras comerciais em 27%. Conclui-se que a sacarose reduz a incidência de raízes bifurcadas quando aplicada cinco dias antes do herbicida ou em mistura de tanque com o mesmo. O AS ameniza a intoxicação da cenoura pelo uso de metribuzin e diminui a porcentagem de cenouras não comerciais.
The carrot (Daucus carota L.) cultivation is performed throughout the year in Brazil. An important aspect of the cultivation of this vegetable is the weed management, which if not properly managed, can become economically unviable to the cultivation. However, the small number of herbicides registered for use in the culture, it ́s a limiting factor. In this sense, metribuzin has potential, although reports on poisoning carrot crop. However, products that can promote adaptive responses in plants they may be used as the protective effects of non-selective herbicides. The purpose of this study was to evaluate the use of metribuzin in the culture of carrot and the use of protectors: sucrose and salicylic acid (SA), to mitigate the poisoning caused by this herbicide in carrots. For this, there were three field experiments in a randomized block design with four replications, in two cultivation. In the first one, treatments consisted in different doses of metribuzin: 0, 144, 288, 432, 576, 720, 960 and 1200 g ha-1. In the second one, it was evaluated the potential use of sucrose and in the third one it was evaluated the potential use of salicylic acid, as protectors of the damage caused by metribuzin in carrot culture. At 30 days was evaluated dry matter from the leaves (DM) and at 120 days, the productivity. The application of metribuzin up to 432 g ha-1 caused no reduction in yield of carrot. The sucrose solution provided increased DM in the cultivar Nayarit, even in the presence of metribuzin, but the same was not observed for the cultivar Verano. Regarding productivity, there was no increase in the application of sucrose. The exogenous application of SA increased the DM regarding treatment 0 mM SA with metribuzin, and also equaled the DM compared to treatment with the absence of the herbicide. There was no increase in productivity with the application of SA, however, there was a increase in the productivity of commercial carrots in 27%. It ́s concluded that the metribuzin not cause damage up to the dose 432 g ha-1. Sucrose reduces the incidence of bifurcated roots when applied to five days before the herbicide or in tank mixed. And SA softens carrot intoxication by the use of metribuzin and decreases the percentage of non-commercial carrots.
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Arias, González Daniela Loreto. "Estudio del efecto de la luz sobre la acumulación de carotenoides en la raíz de reserva de Daucus carota". Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170021.

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Tesis entregada a la Universidad de Chile en cumplimiento parcial de los requisitos para optar al grado de Doctor en Biotecnología Molecular
Los carotenoides son pigmentos que en plantas participan en la fotosíntesis, protección del daño foto-oxidativo y síntesis de fitohormonas. En mamíferos, su consumo es esencial, ya que son precursores de la vitamina A. La síntesis de carotenoides en plantas ha sido bien caracterizada a nivel molecular, centrándose principalmente en los genes que codifican para las enzimas que son parte de la ruta de síntesis de estos pigmentos (llamados ‘genes carotenogénicos’). Por otro lado, se ha reportado que la síntesis de carotenoides en plantas está regulada por diversos factores entre los que se destaca la luz, la cual induce la expresión de genes y la síntesis y acumulación de estos pigmentos en hojas, frutos y flores en plantas modelos, como por ejemplo, tomate, tabaco y Arabidopsis. En el caso de Daucus carota (zanahoria), ésta sintetiza y acumula una gran cantidad de carotenoides en su raíz de reserva que crece en oscuridad, contrario a lo reportado en otros modelos, otorgándole su característico color anaranjado. En este contexto, nuestro grupo de investigación ha determinado que la luz inhibe reversiblemente la síntesis y acumulación de carotenoides en la raíz de reserva de zanahoria al privilegiar el desarrollo de cloroplastos (acumuladores de clorofila) en vez de cromoplastos (acumuladores de carotenoides). Además, a nivel molecular, se genera una regulación negativa sobre los genes carotenogénicos. Para comprender el mecanismo regulatorio en Daucus carota, realizamos un RNA-seq para identificar genes no carotenogénicos reprimidos por la luz en la raíz de Daucus carota, al comparar raíces de 8 semanas crecidas en luz (R/L) versus raíces crecidas en oscuridad (R/O). Entre los genes identificados se encuentran aquellos involucrados en procesos de señalización mediados por hormonas y genes que participan en la biogénesis de plastidios y cromoplastos. Sin embargo, un grupo importante de genes que nos llamo la atención fueron aquellos que participan en cascadas de señalización mediadas por luz, entre los que están PhyA, PhyB, Par1, Pif4, entre otros. De ellos, se seleccionó el gen Par1 que corresponde a un cofactor transcripcional involucrado en el síndrome de huida de la sombra (SAS) y la fotomorfogénesis. La caracterización funcional de DcPar1 mediante su silenciamiento post-transcripcional en zanahoria, provocó una disminución de entre 4 a 60 veces en los niveles de α y β-caroteno en la raíz, mientras que la expresión constitutiva del gen ortólogo AtPar1 de Arabidopsis provocó un aumento de 2,4 veces más de β-caroteno en la raíz de zanahoria. Lo anterior se correlacionó con los niveles de transcritos de genes carotenogénicos claves como DcPsy1 y DcPsy2, los que disminuyeron sus niveles de expresión relativa en las plantas silenciadas para DcPar1, mientras que DcPsy1 aumentó sus niveles de transcritos en zanahorias que expresaron el gen AtPar1. Estos resultados nos permiten sugerir que el gen Par1 posee un rol regulatorio sobre la síntesis y/o acumulación de carotenoides de la raíz de zanahoria que crece en oscuridad. Este trabajo además, nos permitió ampliar nuestro conocimiento respecto de los mecanismos regulatorios de la síntesis y/o acumulación de carotenoides en zanahoria, además de proponer al gen DcPar1 como un gen blanco a manipular con el propósito de aumentar los niveles de estos compuestos antioxidantes en cultivos de interés económico.
The carotenoids are isoprenoids pigments synthesized by plants, algae and by some yeast and bacteria. In plants, these pigments play fundamental functions related with photosynthesis, photo-oxidative protection and synthesis of phytohormones. The synthesis of carotenoids in plants has been well characterized at the molecular level in plants, however these studies have focused mainly on the carotenogenic genes that are part of carotenoid biosynthesis pathway, while the study of non-carotenogenic genes is scarce. On the other hand, it has been reported that the synthesis of carotenoids in plants is regulated by light, which would induce the synthesis and accumulation of these pigments in leaves, fruits and flowers in model plants such as tomato, tobacco and Arabidopsis. Daucus carota (carrot) synthesizes and accumulates a large amount of carotenoids in its root that grows in darkness, contrary to that reported in other plant models, allowing this organ to acquire its characteristic orange color. Our research group has determined that light inhibits the carotenoid synthesis and accumulation in the carrot root, causing the development of chloroplasts (chlorophyll accumulators) instead of chromoplasts (carotenoid accumulators) in the root. Furthermore, at the molecular level, a negative regulation is generated on the carotenogenic genes. This background allows us to propose that light plays an inhibitory role in the carotenoid synthesis in the carrot root that causes this plant to behave distinctly to other plant models. The carotenogenic genes of various plants and those of carrots, have been widely characterized. Considering that light has a negative effect on carotenoid synthesis in carrot root, in this work we identified noncarotenogenic genes repressed by light in the root of Daucus carota, performing an RNA-Seq analysis from 8-week old roots grown in light (R/L) versus roots grown in darkness (R/O). Among the differentially expressed genes (DEGs) identified are those involved in hormone signaling and genes involved in plastid and chromoplast biogenesis. However, an important group of genes that caught our attention were those that participate in light-mediated signaling, among which are PhyA, PhyB, Par1, Pif4, among others. Of these, the Par1 gene was selected. Par1 encodes a transcriptional cofactor involved in the shade avoidance syndrome (SAS) and photomorphogenesis. The functional characterization of DcPar1 by post-transcriptional silencing in carrot, caused a decrease in the levels of α and β-carotene in the root from 4 to 60 times, while the constitutive expression of the Arabidopsis orthologous gene AtPar1 caused an increase in β-carotene in the carrot root from 2.4 times. This was correlated with the transcripts levels of key carotenogenic genes such as DcPsy1 and DcPsy2, which decreased their relative expression levels in DcPar1 silenced plants, while DcPsy1 increased their transcripts levels in carrots that expressed AtPar1 gene. These results allow us to suggest that the Par1 gene has a regulatory role on the synthesis and/or accumulation of carotenoids in the carrot root that grows in darkness. This work allowed us to expand our knowledge regarding the regulatory mechanisms of the synthesis and/or accumulation of carotenoids in carrots, in addition to proposing the DcPar1 gene as a target gene to manipulate with the purpose of increasing the antioxidant compounds levels in economic interest crops.
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Książki na temat "Dacus"

1

White, Ian M. Taxonomy of the Dacina (Diptera:Tephritidae) of Africa and the Middle East. [Hatfield, South Africa]: Entomological Society of Southern Africa, 2006.

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Haynsworth, Toby. Eugene Bonner, Tar Heel composer of opera. Rock Hill, SC: Winthrop College, Manuscript Collection, 1991.

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Sutanthawong, Mānon. Phong sī sathō̜n sǣng samrap tham khrư̄angmāi malǣngwan phonlamai (Dacus Dorsalis, Hendel). [Krung Thēp]: Samnakngān Phalangngān Paramānū phư̄a Santi, 1989.

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Stibick, Jeffrey N. L. Action plan: Oriental fruit fly, Bactrocera dorsalis (Hendel), (Synonym = Dacus dorsalis Hendel). Hyattsville, Md.]: U.S. Dept. of Agriculture, Animal and Plant Health Inspection Service, Cooperating State Departments of Agriculture, 1990.

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István, Főzy. Nopcsa báró és a Kárpát-medence dinoszauruszai: A 'Magyarosaurus dacus' és a többiek. Tatabánya: Alfadat-Press, 2000.

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Darus. Tel Aviv: Yediʻot aḥarnonot, 2002.

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Schnieper, Claudia. Baumeister Dachs. Luzern: Kinderbuchverlag, 1987.

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Mamat, Omar. Tuk Darus. Kuala Lumpur: Dewan Bahasa dan Pustaka, Kementerian Pendidikan Malaysia, 1988.

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Pons, Agustí. Deu daus. València: E. Climent, 1991.

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Deu daus. València [Spain]: E. Climent, 1991.

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Części książek na temat "Dacus"

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Schnell, Anneliese, Richard A. Jarrell, Dorrit Hoffleit, Christoffel Waelkens, Thomas R. Williams, Thomas Nelson Winter, Narahari Achar i in. "Petrus Dacus [Danus]". W The Biographical Encyclopedia of Astronomers, 895. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30400-7_5182.

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Drew, Richard A. I., i Meredith C. Romig. "Figures." W The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 83–118. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0015.

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Drew, Richard A. I., i Meredith C. Romig. "Taxonomy." W The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 25–73. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0010.

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Drew, Richard A. I., i Meredith C. Romig. "New geographical distribution records." W The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 78–79. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0012.

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Abstract New geographical records are presented for 27 species of fruit flies (25 from genus Bactrocera and 2 from genus Dacus) from Papua New Guinea, Indonesian Papua, associated islands and Bougainville.
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Drew, Richard A. I., i Meredith C. Romig. "New male lure records." W The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 80. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0013.

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Abstract New male lure records are presented for 18 fruit fly species from the genus Bactrocera and Dacus from Papua New Guinea, Indonesian Papua (West Papua, Central Papua, Papua), associated islands and Bougainville.
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Drew, Richard A. I., i Meredith C. Romig. "New host plant records." W The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 81. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0014.

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Abstract New host plant records are presented for the following fruit species from Papua New Guinea, Indonesian Papua (West Papua, Central Papua, Papua), associated islands and Bougainville: Bactrocera neocheesmanae, B. bancroftii, B. contermina, B. frauenfeldi, B. musae, B. speculifera, B. trivialis and Dacus axanus.
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Drew, Richard A. I., i Meredith C. Romig. "Systematic analysis of the fauna of Papua New Guinea and associated biogeographical territories." W The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 13–16. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0007.

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Abstract This chapter presents the classification of the dacine fauna of Papua New Guinea and associated biogeographical territories into two genera, Bactrocera Macquart (with 21 subgenera) and Dacus Fabricius (with three subgenera). These include the subgenus Diplodacus May, which occurs in north-eastern Australia and the Torres Strait Islands. A key to genera and subgenera recorded in the Australian-Pacific Region is provided.
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Heppner, John B., John B. Heppner, Minos E. Tzanakakis, Minos E. Tzanakakis, Minos E. Tzanakakis, Pauline O. Lawrence, John L. Capinera i in. "Olive Fruit Fly, Bactrocera oleae (Rossi) (=Dacus oleae) (Diptera: Tephritidae)". W Encyclopedia of Entomology, 2666–69. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_1840.

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Liu, Y. Ch. "Control Technique of Melon Fly, Dacus cucurbitae, by Using Mixed Cuelure". W Fruit Flies, 359–63. New York, NY: Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4757-2278-9_70.

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Elghadi, Esam, i Gordon Port. "Use of Entomopathogenic Fungi for the Biological Control of the Greater Melon Fly Dacus frontalis in Libya". W Area-Wide Management of Fruit Fly Pests, 251–65. Boca Raton, FL : CRC Press, [2020]: CRC Press, 2019. http://dx.doi.org/10.1201/9780429355738-24.

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Streszczenia konferencji na temat "Dacus"

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Philimis, Panayiotis, Elias Psimolophitis, Stavros Hadjiyiannis, Alessandro Giusti, Josep Perelló, Albert Serrat i Pedro Avila. "A centralised remote data collection system using automated traps for managing and controlling the population of the Mediterranean (Ceratitis capitata) and olive (Dacus oleae) fruit flies". W First International Conference on Remote Sensing and Geoinformation of Environment, redaktorzy Diofantos G. Hadjimitsis, Kyriacos Themistocleous, Silas Michaelides i George Papadavid. SPIE, 2013. http://dx.doi.org/10.1117/12.2028244.

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Huang, Yu, Wu-Tung Cheng, Kun-Han Tsai, Greg Crowell i Chris Mcmahon. "Diagnosing DACS (Defects That Affect Scan Chain and System Logic)". W ISTFA 2004. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.istfa2004p0191.

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Abstract In this paper, DACS stands for Defects that Affect Chain and System, which could be any type of silicon defects caused by an unintentional interaction between a scan chain signal and a system logic signal. The device could fail scan chain testing or show up as a latent failure in the customer’s system. A novel diagnosis methodology is proposed to locate both ends of a DACS. The proposed algorithm can be generally applied to any type of DACS. Experimental results on industrial chips demonstrate the effectiveness of the proposed method.
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Shon, Myungjoon, Kisu Kim, Hansol Lee, Sung Y. Shin i Jiman Hong. "DACS". W SAC 2017: Symposium on Applied Computing. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3019612.3027148.

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Krishnan, Girish, i G. K. Ananthasuresh. "An Objective Evaluation of Displacement-Amplifying Compliant Mechanisms for Sensor Applications". W ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99345.

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Displacement-amplifying compliant mechanisms (DaCMs) reported in literature are mostly used for actuator applications. This paper considers them for sensor applications that rely on displacement measurement, and evaluates them objectively. The main goal is to increase the sensitivity under constraints imposed by several secondary requirements and practical constraints. A spring-mass-lever model that effectively captures the addition of a DaCM to a sensor is used in comparing eight DaCMs. We observe that they significantly differ in performance criteria such as geometric advantage, stiffness, natural frequency, mode amplification, factor of safety against failure, cross-axis stiffness, etc., but none excel in all. Thus, a combined figure of merit is proposed using which the most suitable DaCM could be selected for a sensor application. A case-study of a micro machined capacitive accelerometer and another case-study of a vision-based force sensor are included to illustrate the general evaluation and selection procedure of DaCMs with specific applications. Some other insights gained with the analysis presented here were the optimum size-scale for a DaCM, the effect on its natural frequency, limits on its stiffness, and working range of the sensor.
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Joshi, Narendra D., Michael J. Epstein, Susan Durlak, Steven Marakovits i Paul E. Sabla. "Development of a Fuel Air Premixer for Aero-Derivative Dry Low Emissions Combustors". W ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-253.

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An experimental program was conducted to develop premixer concepts for use in GE’s aero-derivative Marine and Industrial gas turbine engines such as the LM 1600, 2500 and 6000. These engines operate typically at pressure ratios up to 30:1. Extensive tests in 1 and 2 cup test combustors were carried out to evaluate the Double Annular Counter-Rotating Swirler (DACRS) premixers at test conditions representative of the above mentioned engines. These tests also help establish combustor design parameters. Single digit NOx emissions were measured at engine operating conditions with the DACRS II and III premixers. Premixer interactions and their effects on Lean Blow Out were also studied.
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Hura, Harjit S., Narendra D. Joshi, Hukam C. Mongia i Jon Tonouchi. "Dry Low Emissions Premixer CCD Modeling and Validation". W ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-444.

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Computational Combustion Dynamics has been used extensively at General Electric Company for combustion applications. This paper demonstrates an application of Advanced Combustion Code to GE’s lean premixed dry low NOx emissions LM2500 and LM6000 gas turbine combustors. A methodology for anchoring the Double Annular Counter-Rotating Swirler (DACRS) exit conditions to Laser Doppler Velocity data from a reacting single cup experiment is described. The DACRS exit velocity profiles and turbulence parameters are inlet boundary conditions for the annular combustor simulation. Since over 80 per cent of the total air enters the combustor via the premixers, inaccuracies in these boundary conditions have a significant impact on the predicted flame shape, liner temperatures and emissions. The paper shows comparisons between measured and predicted velocity in a rectangular duct equipped with a single DACRS. The k-ε turbulence model and the two-step eddy break up/eddy dissipation combustion models are used to predict the reacting flow field of the natural gas/air flame. The inlet velocity profiles are developed first to match the LV data and the observed flame impingement location at nominal settings of the inlet turbulence parameters. The sum square error between measured and predicted velocity is used as the optimization function. Next, a design of experiment computational study is conducted to determine the inlet turbulence length scale and kinetic energy in order to further improve the data match. The eddy break up model is shown to be more robust than the eddy dissipation model. The eddy dissipation model resulted in slow combustion rates, and high fuel and carbon monoxide emissions.
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Galchenko, E. I., I. I. Seregina i O. V. Eliseeva. "The use of environmentally friendly growth regulators in the cultivation of root crops". W III All-Russian Scientific Conference with International Participation "Science, technology, society: Environmental engineering for sustainable development of territories". Krasnoyarsk Science and Technology City Hall, 2022. http://dx.doi.org/10.47813/nto.3.2022.6.204-209.

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In field studies, the influence of various environmentally friendly plant growth bioregulators was studied when growing carrots (Daucus carota L.) of the Vitamin 6 variety. Various concentrations of growth regulators were studied, which allow obtaining the maximum possible yield of carrot plants under given growing conditions.
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Lučić, Sonja. "VEŠTAČKA INTELIGENCIJA I PATENTNO PRAVO". W XVIII Majsko savetovanje. University of Kragujevac, Faculty of Law, 2022. http://dx.doi.org/10.46793/xviiimajsko.479l.

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Artificial intelligence is a field of technology that is developing intensively. Along with the development of artificial intelligence, the issue of its patent protection has become topical. Artificial intelligence systems are based on highly developed algorithms and mathematical models, phenomena with which patent law is traditionally in conflict. This issue is not just a national or European problem. There is also an intensive debate in the United States about the patentability of artificially intelligent systems. The author deals with the question of whether artificially intelligent systems can enjoy patent protection. The paper analyzes the case of "DABUS" which refers to an international patent application in which the artificially intelligent system DABUS is listed as the inventor. Numerous intellectual property offices around the world (eg American, British, German, Australian, EPO) have rejected such a patent application. On the other hand, the Federal Court of Australia has ruled that under the Australian Patent Act AI could be listed as the inventor. Recognition of AI as the inventor (not the owner) of inventions generated by artificial intelligence can have certain consequences, including in the field of copyright.
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Fantappier, Pierluigi. "L-DACS Spectral Efficiency". W 2019 Integrated Communications, Navigation and Surveillance Conference (ICNS). IEEE, 2019. http://dx.doi.org/10.1109/icnsurv.2019.8735269.

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Davis, Dustin W., Junghwa Nolan, Justin T. Brumberg, Ertan Yilmaz, Balachandar Varatharajan, Jeffrey S. Goldmeer i Benjamin P. Lacy. "The Effect of Fuel Density on Mixing Profiles in a DACRS Type Premixer: Experiments and Simulation". W ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27878.

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A combined experimental and computational study was conducted to investigate the effect of fuel density variations on mixing from a double annular counter-rotating swirl (DACRS) nozzle operated at atmospheric pressure under non-reacting conditions using either helium (He) or a mixture of He and CO2 as fuel simulants. A small probe traversed through the flow collecting gas samples that were sent to gas analyzers measuring the concentration profiles. The resulting measurements are then used to validate the computational fluid dynamics (CFD) model. A commercial CFD code (CFX 10) with a Reynolds averaged Navier-Stokes (RANS) formulation was used to simulate the experiment. Multiple turbulence closures, such as standard and realizable k-ε and SSG Reynolds stress model were evaluated. Additionally, several geometrical considerations, such as modeling a 72° sector versus a full 360°, were tested. While at high fuel-to-air momentum flux ratios (J) the fuel simulant concentration profiles were outward-peaked, and at low J the profiles were center-peaked. An analysis of the experimental results clearly indicate the momentum flux ratio is the most influential parameter controlling mixing in a DACRS nozzle. The simulations produced quantitative agreement with the experimental measurements using the realizable k-ε turbulence closure and only modeling a 72° sector of the nozzle. The complexity of the studied problem required a considerable refinement of the grid to produce an accurate and grid independent solution. The validated model may now be used to explore the design space for optimization of a nozzle for utilization in a syngas application.
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Raporty organizacyjne na temat "Dacus"

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Zuehlke, A. C. DACS upgrade acceptance test procedure. Office of Scientific and Technical Information (OSTI), wrzesień 1994. http://dx.doi.org/10.2172/10189342.

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Zuehlke, A. C. DACS upgrade acceptance test report. Office of Scientific and Technical Information (OSTI), grudzień 1994. http://dx.doi.org/10.2172/10115311.

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Rogers, Kris C., Kenneth D. Vane i Myron Coplin. Pyramid Development Corporation PC/DACS. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 1989. http://dx.doi.org/10.21236/ada234169.

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Zuehlke, A. C. GMS/DACS interface acceptance test report. Office of Scientific and Technical Information (OSTI), październik 1994. http://dx.doi.org/10.2172/10192320.

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Zuehlke, A. C. GMS/DACS interface acceptance test procedure. Office of Scientific and Technical Information (OSTI), wrzesień 1994. http://dx.doi.org/10.2172/10185766.

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Ermi, A. M. System design description for ``Mini-DACS`` data acquisition and control system. Office of Scientific and Technical Information (OSTI), październik 1996. http://dx.doi.org/10.2172/328465.

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Vargo, F. G. Jr, L. T. Trujillo i S. O. Smith. System design description for mini-dacs data acquisition and control system. Office of Scientific and Technical Information (OSTI), wrzesień 1994. http://dx.doi.org/10.2172/10190088.

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ERMI, A. M. 241-SY-101 DACS instrument problem screen (SCR 448) acceptance test procedure. Office of Scientific and Technical Information (OSTI), czerwiec 1999. http://dx.doi.org/10.2172/782426.

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Larsen, D. C. Thermocouple module halt acceptance test report for tank 241-SY-101 DACS-1. Office of Scientific and Technical Information (OSTI), marzec 1998. http://dx.doi.org/10.2172/362545.

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Gauck, G. J. Closed out tank 241-SY-101 DACS System Change Request No. 301-400. Office of Scientific and Technical Information (OSTI), marzec 1995. http://dx.doi.org/10.2172/37591.

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