Dissertations / Theses on the topic 'Ovaling'
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Kužela, Josef. "Průzkum vlivu geometrie průřezu ohýbané části na životnost stabilizační tyče automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230519.
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Diploma thesis discusses and summarizes the problematic how ovality effects durability of bended tubes. The work presents an approach to the solution, the experiments concerning change of ovality, changes in the thickness of the distorted cross-section. Final results represent connection between ovality and durability.
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Šrom, Jan. "Analýza procesu ohybu trubky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318754.
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Master thesis analyzes rotary draw bending of the tubes without using a mandrel. Bending process is accompanied by many defects due to large displacement of formed material. One of the major defects is flattering of the cross section also called ovality. In order to decrease ovality comes up a proposal of the changes to the tool design. Modifications of tool’s geometry are numerically analyzed by finite element method in software ANSYS. According to the results of the simulations an optimized pressure die is manufactured. Several experimental tests are accomplished to verify the effect of the optimized tool design. Approximately 100 bends confirm a decrease of ovality using modified pressure die.
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Gottlieb, James Harold 1954. "Torsional properties of an ovaline cross section." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/292023.
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Torsional properties of a solid, linearly elastic, and isotropic bar with the cross section in the shape of an ovaline were investigated. An ovaline is a variant of an ellipse defined by the parametric equations: x = a(1 + αcos²λ)cosλ, and y = b(1 + βsin²λ)sinλ. Only ovalines with a smooth, aerodynamic type of cross section under St. Venant torsion were considered. The torsional properties of interest included the maximum shear stress component, the maximum shear stress magnitude and the torsional stiffness. The results from twenty-eight finite element models were correlated to several candidate solutions for each of the torsional properties based on variances of the classical elliptical solution. Correction factors are provided where appropriate. The recommended methods of solution provide highly accurate results for the class of ovalines considered in a fraction of the time required to obtain results via the finite element method.
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Loučka, Pavel. "Měření ovality extrudovaného vlákna pomocí tří kamer." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401570.
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One of the important parameters observed during extruded fibre fabrication is its diameter. The diameter can be measured with a single scanning camera assuming that the fibre section has a circular shape. As proved in practice, another important parameter is ovality, that is the rate of fibre flattening. This paper assumes that the fibre section shape is elliptical. In such a case, at least three different views on examined fibre are needed. Mathematical part of this paper is concerned with analytical description of fibre ovality measurement using two different approaches based on the knowledge of linear algebra, projective geometry and conic sections theory. Main goal of this paper is thus to use both mathematical theory and image analysis methods for ovality and diameter determination. Precise calcluation of such quantities is, however, conditioned on precise camera system calibration, which is described in the paper as well. Additionally, the work contains a brief mention of technical realization of ovality measurement and its possible difficulties.
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Franzen, Olaf. "Katheterinterventioneller Verschluss von Vorhofseptumdefekten und offenen Foramina ovalia." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=968467121.
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Wong, Stephanie. "The ecophysiological effects of CO2 enrichment on the seagrass Halophila ovalis." Thesis, Wong, Stephanie (2016) The ecophysiological effects of CO2 enrichment on the seagrass Halophila ovalis. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/35396/.
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Ocean acidification is one of the biggest challenges happening in the marine environment and causes a shift in dissolved inorganic carbon (DIC) concentrations and lowers the seawater pH. This causes negative impacts on many marine organisms and thus affecting the ecosystem. However, the effect of increasing CO2 concentration dissolved in the ocean can potentially be beneficial to the growth of seagrass. This effect was examined on the seagrass Halophila ovalis (R. Br.) Hook f., the dominant seagrass species found in Swan-Canning Estuary, Western Australia. This study was done with controlled experiments, using CO2-enrichment as a simulation of ocean acidification. The seagrass was collected and cultured in the laboratory for 15 days while pH and alkalinity of seawater and photochemical efficiency (Fv /Fm) of the seagrass were monitored. Chlorophyll content, growth (shoot plastochrone interval, leaf and rhizome elongation) and biomass productivity of the plants were measured at the end of the experiment. The seagrass was collected in early and mid-winter for two experiment replicates and a strong seasonal variation was observed. A diurnal pattern was found in pH for both CO2-enriched and control aquaria, showing a buffering effect by seagrass photosynthesis. Significant differences were found in the DIC concentrations with decreasing pCO2 and increasing HCO3- concentrations in the first experiment but opposite results found in the second experiment. The healthier seagrass in the first experiment showed a decreasing photochemical efficiency over time while the seagrass in the second experiment showed an increasing photochemical efficiency potentially due to the recovery from storm stress and epiphyte load. Significantly higher biomass productivity was found in the seagrass from the CO2-enriched aquaria of the first experiment but not in the second. It was difficult to determine whether the increase in biomass productivity was caused by the addition of CO2 or the seagrass reproduction. It is suggested that more replicates and long term experiments are needed to study the relationship between seagrass productivity and seasonality along with the effect of increasing dissolved CO2 in seawater. Field experiments are also needed in the future to explore the potential of using seagrass in buffering the effect of ocean acidification which might help the broader marine community at an ecosystem level to survive the ongoing environmental changes.
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Steele, Rebecca. "Chronoecology of a Cave-dwelling Orb-weaver Spider, Meta ovalis (Araneae: Tetragnathidae)." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/etd/3713.
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Circadian clocks enable coordination of essential biological and metabolic processes in relation to the 24-hour light cycle. However, there are many habitats that are not subject to this light cycle, such as the deep sea, arctic regions, and cave systems. This study analyzes the circadian pattern of isolated populations of a subterranean spider, Meta ovalis from two Tennessee caves and five Indiana caves. Locomotor activity was recorded with TriKinetics LAM50 Locomotor Activity Monitor under a 12-hour light (L), 12-hour dark (D) (LD 12:12) cycle preceding total darkness (DD). Significant differences were found within and among populations found in Tennessee cave systems in average free running period and onset of locomotor activity. Selection, drift, and genetic fixation are explored as the causes of variation in the present study, using M. ovalis as the model organism. All five caves in Indiana show little variation, whereas both Tennessee caves show large interindividual variation.
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Steele, Rebecca, Clinton Elmore, Rebecca Wilson, Darrell James Moore, Blaine W. Schubert, and Thomas Charles Jones. "Chronoecology of the Cave Dwelling Orb-Weaver Spider, Meta ovalis (Araneae: Tetragnathidae)." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/198.
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Circadian clocks are endogenous time keeping mechanisms that are ubiquitous among animals. They enable coordination of many essential biological and metabolic processes in relation to the 24 hour light cycle on earth. However, there are many habitats on earth that are not subject to this light cycle. This study aims to look at the potential genetic drift of the circadian rhythm of a subterranean spider, Meta ovalis, as well as gathering general natural history information on this under-studied spider. This study will fill general gaps in knowledge of this spider and its habitat, highlight the importance of studying organisms within a subterranean environment, and place importance on cave conservation and acquiring knowledge of these specialized, and sensitive species. This study integrates circadian and foraging theory to evaluate species as circadian specialists and generalists based on how narrowly or widely their activity is spread over the 24 h cycle. We suggest that M. ovalis benefits from a generalist strategy, showing small bursts of focused activity widely dispersed across the 24 h cycle, allowing it to capture prey opportunistically whenever it is available. Live spiders were collected from area caves, monitored in an environment controlled for light and temperature, and returned to their cave of origin. The activity of each spider was analyzed for differences in circadian activity among and between populations to determine if there is a significant drift of the circadian strategy between isolated populations of Meta ovalis. We expect to see a different circadian strategy implemented between populations due to drift from the spiders being isolated from other populations.
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Poon, Yuk-lam Francis. "A case study of tonic food drink marketing strategy /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14038626.
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David, Patrice. "Structures génétiques et relation génotype-phénotype en milieu marin : Le cas du bivalve "Spisula ovalis"." Montpellier 2, 1996. http://www.theses.fr/1996MON20143.
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La genetique des populations de bivalves marins est caracterisee par deux observations recurrentes: 1) une correlation positive entre l'heterozygotie individuelle et la valeur selective, 2) des deficits en heterozygotes inexpliques au regard du mode de reproduction (fecondation externe, dispersion larvaire). Le polymorphisme genetique des populations naturelles du bivalve spisula ovalis a ete etudie par electrophorese enzymatique pour rechercher l'origine de ces phenomenes. Des correlations positives entre l'heterozygotie et la survie d'une part, entre l'heterozygotie et la croissance d'autre part, ont ete mises en evidence chez cette espece. La comparaison des observations avec les attendus theoriques suggere que les locus enzymatiques utilises sont neutres, et que leur heterozygotie est correlee a celle d'autres locus responsables des variations de croissance et de survie. La structure genetique des populations de s. Ovalis montre des deficits en heterozygotes, ainsi qu'une heterogeneite spatio-temporelle fine. Les deficits en heterozygotes sont variables entre locus et pourraient etre dus a une sous-estimation de l'heterozygotie par la technique d'electrophorese (alleles nuls). La structure genetique fine a ete mise en relation avec la demographie de l'espece, caracterisee par une segregation spatiale entre classes d'age, pouvant restreindre les echanges genetiques
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Said, Nicole. "Effects of temperature and location on the photosynthesis-irradiance relationship of the seagrass Halophila ovalis." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2017. https://ro.ecu.edu.au/theses/2028.
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Seagrasses are among the most threatened ecosystems globally, despite their ecological importance. The global area is declining at a median rate of 5-7% y-1 which can be attributed to two major anthropogenic causes: direct impacts from coastal development and dredging, often associated with ports; and indirect impacts from reduced water quality (Waycott et al., 2009). Both pose a threat due to reduced light quantity. Knowledge of seagrass photosynthetic characteristics can assist in predicting and managing impacts of light reducing activities, such as dredging. However, information on photo-physiology is quite limited. Most studies on seagrass photosynthetic characteristics generally focus only on one location or time of sampling. Yet, most seagrass species have broad distributions and grow over a range of temperatures. For effective management it is important to know if these characteristics vary in space and time and under different temperature conditions, so that the appropriate information can be applied.
The aim of this study was to assess whether the photosynthesisirradiance (P-I) relationship of seagrass varied in different locations and under different temperatures. The model species used was Halophila ovalis, an ecologically important seagrass, which is globally distributed, but little is known about the variation in its P-I relationship. Four locations were selected across a latitudinal gradient along the Western Australian coast (3 temperate & 1 tropical) and H. ovalis was collected from two sites within each location. Plants were acclimated to three different temperatures, 17°C, 23°C and 28°C, which relatively covered each locations average minimum and maximum temperature. P-I relationships of whole plants were determined in sealed chambers, with oxygen concentrations measured in the dark (respiration), and light (30-300 μmol photons m-2 s-1). At all locations, temperature affected all photosynthetic parameters, but there were significant Temp x Location/Site interactions (p
This study showed that there was a significance difference on the P-I relationship when using different plant segments, with a vast difference in using leaves alone compered to whole or reconstructed plants. In conclusion the P-I response of H. ovalis is affected by temperature, but the effect is spatially and temporally variable, with the methodology employed showing an effect on the P-I relationship. Therefore the management of H. ovalis, and likely other seagrasses, based on their photosynthetic light requirements will require location-specific knowledge and, in most cases, site-specific knowledge of P-I relationships.
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Kilminster, Kieryn Lee. "Biogeochemical constraints on the growth and nutrition of the seagrass Halophila ovalis in the Swan River Estuary." University of Western Australia. School of Plant Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0016.
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[Truncated abstract] Biogeochemical processes in seagrass sediments influence growth and nutrition of seagrasses. This thesis investigates the below-ground interactions between biotic and abiotic factors that influence seagrass nutrition and growth, with focus on a small species of seagrass, Halophila ovalis (R. Br.) Hook ƒ., from the Swan River Estuary, Western Australia. Seagrass showed significantly lower growth and an increase in leaf nitrogen and phosphorus concentrations with increased organic matter loading. With maximal light reduction, lower growth rates and average leaf weights were observed, and leaf nitrogen and phosphorus concentrations were higher. Light reduction was also shown to increase bioavailability of inorganic nutrients within porewater of seagrass sediment . . . Sulphide was hypothesised to have an inhibitory effect on nutrient uptake of Halophila ovalis. Below-ground sulphide inhibits the photosynthetic efficiency of photosystem II at sulphide concentrations greater than 1 mM. Sulphide exposure enhanced phosphate uptake, with no significant effect on ammonium uptake of H. ovalis. This thesis demonstrates that biogeochemical processes both constrain the potential growth of seagrasses and influence the nutrient status of seagrass tissue. Consideration of the influence of sulphide stress on seagrasses is likely to be particularly important for anthropogenically influenced aquatic systems, where inputs of organic matter are enriched relative to pristine ecosystems. A better understanding of biogeochemical processes will allow researchers to predict how future changes in sediment chemistry will influence seagrass meadows.
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Rector, Meghan Anne. "Foraging in the Cave Environment: The Ecology of the Cave Spider Meta ovalis (Araneae: Tetragnathidae)." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259688464.
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Parker, Joshua G. "Fast-tracking succession: Utilising Halophila ovalis to improve the survival of climax seagrass transplants in Western Australia." Thesis, Parker, Joshua G. (2020) Fast-tracking succession: Utilising Halophila ovalis to improve the survival of climax seagrass transplants in Western Australia. Honours thesis, Murdoch University, 2020. https://researchrepository.murdoch.edu.au/id/eprint/61173/.
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Seagrasses provide many important ecosystem services and functions, benefiting a wide range of marine organisms and the livelihoods of many people around the world. Unfortunately, the global extent of seagrasses worldwide has declined significantly as a result of anthropogenic impacts in conjunction with more intense and frequent natural impacts, exacerbating the loss. There have been many attempts around the world and more recently in Western Australia to restore degraded and damaged seagrass meadows. Common transplanting methods involve vegetative fragments or seeds/seedlings which are planted either directly into bare substrate or together with artificial substrate stabilisers such as mesh mats. These methods have displayed mixed results and proved to be very costly and slow.
Recent thinking in seagrass rehabilitation involves “compressed succession” which promotes fast-growing colonising species to spread into disturbed areas, then planting slow-growing climax species into these areas. In this study, plagiotropic sprigs of Posidonia australis (N = 108) were planted into areas containing either Halophila ovalis, P. australis or bare sand in Jervoise Bay, Perth and monitored weekly from April to August 2020. Similarly, orthotropic sprigs of Posidonia coriacea (N = 120) were planted into areas containing either H. ovalis, P. coriacea or bare sand in Bateman Bay, Ningaloo Reef and monitored fortnightly from June to August 2020. We hypothesised that if the colonising species H. ovalis was present, then sprig survival would be improved.
The study in Jervoise Bay found that over the course of five months, approximately 60 % of sprigs survived overall. Sprig survival was improved in treatments that featured existing seagrass growth. Sprig survival was only improved by 11 % when transplanted into an existing meadow of P. australis compared to a meadow of H. ovalis. Similarly, the study in Bateman Bay found that over the course of seven weeks, approximately 88 % of sprigs survived overall. Sprig survival was relatively similar in all treatments, however greater survival rates occurred in treatments that featured existing seagrass growth. Even though H. ovalis is smaller in structural form than P. australis and P. coriacea, the rapid growth rate of H. ovalis makes it appealing to transplant into, making it a viable “compressed succession” pathway. Overall, the results support the idea that existing seagrass meadows can provide protection for transplants, improving their survival.
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Decker, Ulrike [Verfasser], and Roland [Akademischer Betreuer] Frankenberger. "Analyse der koronalen Dichtigkeit unter Verwendung verschiedener Wurzelkanalsealer mit verschiedenen Obturationstechniken bei ovalen Wurzelkanälen / Ulrike Decker. Betreuer: Roland Frankenberger." Marburg : Philipps-Universität Marburg, 2015. http://d-nb.info/1064976336/34.
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Choney, Gary. "The impact of Black swan (Cygnus atratus) grazing on the seagrass Halophila ovalis in the Lower Swan River estuary." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/446.
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Grazing is an important ecosystem process, influencing community structure and rates of ecosystem processes. Although grazing on seagrasses is generally considered to be minor in many temperate regions of the world, waterfowl are often considered significant grazers in temperate lagoons and estuaries. This study examined spatial and temporal variation in swan abundance, grazing pressure and the impact grazing has on seagrass. Little is known on how grazing rates vary on larger water bodies in the southern hemisphere at different times of year and whether temporal changes in grazing rates affect the ability of seagrasses to tolerate grazing. The plant response to grazing may not be consistent seasonally, in light of recent terrestrial studies suggesting changes in environmental factors over a year such as light, temperature and nutrient supply can influence the ability of plants to cope with grazing. Furthermore, studies have suggested changes in sexual reproduction can be considered a trait to cope with grazing. However, very few studies have investigated this relationship, particularly in seagrasses. With these three main knowledge gaps in mind, this study examined grazing interactions between the black swan (Cygnus atratus) and the seagrass Halophila ovalis in a temperate, estuarine seagrass ecosystem, the Lower Swan River estuary, Western Australia. Firstly, spatial and temporal variation in black swan abundance was documented across 45 sites in four seasons (spring, summer, autumn and winter) and at two times of day. Further investigations sought to determine whether there were changes in grazing pressure over a year. This was conducted at three high “swan use” sites in each season. Finally, the strategies seagrasses use to cope with grazing, and how these vary temporally were assessed using an observational approach across a natural grazing gradient and experimental manipulations (simulated grazing). There was significant variation in black swan density among seasons, with the highest number of swans present during autumn (185 swans), intermediate numbers in summer (104 swans) and winter (80 swans) and the lowest in spring (53 swans). Swans may move to ephemeral wetlands during times of low swan abundance on the estuary. An analysis of the temporal variation in swan abundance on the surrounding wetlands on the Swan Coastal Plain does not show a consistent pattern of seasonal variation on the wetlands. Movement of black swans to ephemeral wetlands is likely to be due to a variety of factors including water height, food availability and the breeding needs of the black swan.
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Lavignasse, Sophie. "Lexicographie et dictionnairique d'un dictionnaire de spécialité traitant de sport : un cas d'application, le "Dictionnaire du rugby - L'Ovalie dans tous ses sens"." Thesis, Cergy-Pontoise, 2010. http://www.theses.fr/2010CERG0469.
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Dans un premier temps, afin de définir et de créer une typologie des ouvrages dictionnairiques existants concernant le sport, plus de 400 disciplines sportives ont été identifiées et plus de 200 ont été définies (celles qui étaient les moins répandues dans le monde). Elles ont été ensuite classées dans 19 groupes thématiques, classement qui a été par la suite soumis à une analyse critique. L'ensemble de ces disciplines a permis de référencer près de 500 ouvrages dictionnairiques à partir desquels différents critères d'élaboration d'un dictionnaire de spécialité ont pu être établis. Ainsi, les critères les plus pertinents et les plus adaptés ont été choisis pour élaborer le "Dictionnaire du rugby – L'Ovalie dans tous ses sens".Dans un second temps, une approche concernant ce dictionnaire de spécialité a été présentée en précisant les choix concernant, d'une part, le sujet, et d'autre part, la philosophie d'un tel ouvrage. Cette réflexion a porté sur l'objectif d'un tel dictionnaire, sur le public visé, sur la façon dont il a été rédigé ainsi que sur sa structure. En outre, il a été pertinent d'analyser le traitement du terme rugby (et de son vocabulaire) dans une quinzaine d'ouvrages. Enfin, une étude a été entreprise pour proposer la méthodologie concernant l'élaboration du "Dictionnaire du rugby – L'Ovalie dans tous ses sens" en insistant notamment sur le protocole de rédaction, sur la création de la charte graphique, sur la présentation du paratexte, sur l'élaboration de la nomenclature, sur les différentes étapes de la rédaction et sur celles de la correctionFirstly, in order to define and create a typology of existing dictionaries concerning sport, we identified more than 400 sports and among them we defined more than 200 sports (those which were the less common around the world). We then classified them into 19 thematic groups, which classification has been submitted to a technical review. All these sports have allowed us to reference near to 500 dictionaries from which we have been able to identify the various criteria which enable the writing of specialty dictionaries. We have chosen the most relevant and suitable criteria to write our "Dictionnaire du rugby – L'Ovalie dans tous ses sens".Secondly, we described our approach concerning this specialty dictionary by specifying our thought and choices related to, on the one hand, the subject and, on the other hand, the philosophy of a work of this kind. This reflection covered the objective of such a dictionary, the targeted public, the way it has been written and its structure. Furthermore, we considered the treatment of the term rugby (and of its vocabulary) in about fifteen books. Finally, we proposed our methodology for the writing of the "Dictionnaire du rugby – L'Ovalie dans tous ses sens" focusing in particular on the protocol of writing, the creation of a graphic chart, the presentation of the paratext, the conception of a nomenclature, and on the different steps of the writing and the rectifications
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Büttner, Katharina [Verfasser], Johannes [Akademischer Betreuer] Ebert, Anselm [Gutachter] Petschelt, and Johannes [Gutachter] Ebert. "Füllung von mit SAF präparierten kleinen ovalen Wurzelkanälen – Einfluss verschiedener Sealer / Katharina Büttner ; Gutachter: Anselm Petschelt, Johannes Ebert ; Betreuer: Johannes Ebert." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1237498996/34.
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Фединець, Олександр Олександрович, and Oleksandr Fedynets. "Інформаційно-вимірювальна система для контролю відхилення форми та розміщення поверхонь для деталей великої довжини." Master's thesis, ТНТУ ім. І. Пулюя, 2020. http://elartu.tntu.edu.ua/handle/lib/33746.
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Розроблено інформаційно-вимірювальну систему для контролю відхилення форми та розміщення поверхонь для деталей великої довжини. В даному дипломі було проведено вдосконалення методів контролю параметрів довгомірних труб для геолого-розвідувальних робіт. Описаний вимірювальний пристрій, що здійснює комплексний контроль основних параметрів. Проведено розрахунок елементів конструкції приладу, Зроблено математичне дослідження руху циліндричного тіла зі зміщеним центром мас по похилій площині. Також у даній роботі проведено опис роботи та аналіз схеми електричної принципової та складено алгоритм роботи мікропроцесорної системи.An information and measuring system for the control of the deviation of the shape and placement of surfaces for long parts has been developed. In this diploma the improvement of methods of control of parameters of long pipes for geological prospecting works was carried out. The measuring device which carries out the complex control of the basic parameters is described. The calculation of the structural elements of the device is performed. A mathematical study of the motion of a cylindrical body with a shifted center of mass on an inclined plane is made. Also in this work the description of work and the analysis of the scheme of electric basic and the algorithm of work of microprocessor system is made.
ВСТУП ...7 1 АНАЛІТИЧНА ЧАСТИНА ...8 1.1 Огляд методу контролю заданих параметрів ...8 1.2 Аналіз об’єкту вимірювання і контролю ...11 1.3 Опис кінематичної і пневматичної схеми приладу ...12 2 ОСНОВНА ЧАСТИНА ...14 2.1 Опис роботи приладу ...14 2.2 Вибір елементів конструкції приладу ...15 2.3 Розрахунок передачі гвинт-гайка ...16 2.4 Вибір електродвигуна ...21 2.5 Розрахунок черв’ячної передачі ...23 2.1 Вибір пневмоциліндрів ...34 2.1.1 Розрахунок пневмоциліндра завантажувача ...34 2.1.2 Розрахунок пневмоциліндра сортування ...35 2.2 Визначення похибки контролю ...38 2.3 Повірка пристрою ...38 3 НАУКОВО-ДОСЛІДНА ЧАСТИНА ...40 3.1 Дослідження руху циліндричного тіла зі зміщеним центром мас по похилій площині ...40 3.2 Опис програми та програма роботи ...48 4 СПЕЦІАЛЬНА ЧАСТИНА ...51 4.1 Опис схеми електричної структурної ...51 4.2 Опис роботи та аналіз схеми електричної принципової ...52 4.3 Алгоритм роботи мікропроцесорної системи ...54 4.4 Лістинг програми зчитування ...58 5 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ ...61 5.1 Характеристика небезпечних зон обладнання і заходи безпеки при роботі ...61 5.2 Розрахунок плавкої вставки електродвигуна ...65 5.2 Безпека в надзвичайних ситуаціях ...66 5.21 Безпека виробничої діяльності на підприємствах ...66 5.2.2 Вплив шуму на виробничу діяльність та методи захисту ...67 ЗАГАЛЬНІ ВИСНОВКИ ДО МАГІСТЕРСЬКОЇ РОБОТИ ...71 ПЕРЕЛІК ПОСИЛАНЬ ...72 ДОДАТКИ ...74
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Nguyen, Xuan Vy [Verfasser]. "Application of genetic markers for identification of Halophila members and genetic variation of Halophila ovalis from Western Pacific to Eastern Indian Ocean / Xuan Vy Nguyen." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2014. http://d-nb.info/1057897493/34.
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Kleye, Christin [Verfasser], and Roland [Akademischer Betreuer] Frankenberger. "Vergleich zweier maschineller Nickel-Titan-Revisionssysteme hinsichtlich der Revisionseffizienz von Wurzelkanalfüllungen in ovalen Wurzelkanälen mit und ohne Einsatz des Lösungsmittels Eukalyptol / Christin Kleye. Betreuer: Roland Frankenberger." Marburg : Philipps-Universität Marburg, 2014. http://d-nb.info/1054419086/34.
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Rýdel, David. "Tlakově lité odlitky z Al slitin - trendy vývoje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228046.
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The objective of this diploma thesis is to state the influence of porosity, DAS and shape factor on mechanical characteristics for the cast transmission cover made in Kovolit Modrice a.s.Which was molten from AlSi9Cu3. It was used an imaging software (Olympus Five) for classification of metallographical structures.
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Klocová, Petra. "Hodnocení porezity u odlitků tlakově litých z Al slitin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228047.
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The objective of this diploma thesis is an evaluation of die-castings porosity, eventually the evaluation of seats with local squeeze in connection with their mechanical and structural properties. The swatches of alloy AISi9Cu3 were taken from the engine block made by Škoda Auto Company, Mladá Boleslav. To the evaluation and the comparison of the results there were the other VUT FSI Brno students´ theses used.
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Adler, Carolin [Verfasser], Michael [Akademischer Betreuer] Hülsmann, and Sabine [Akademischer Betreuer] Sennhenn-Kirchner. "Vergleichende In-vitro-Studie zur Entfernung der medikamentösen Einlage Kalziumhydroxid aus runden und ovalen Wurzelkanälen. Vergleich von passiver Ultraschallspülung und SAF: Eine Micro-Computertomographie-Studie / Carolin Adler. Gutachter: Michael Hülsmann ; Sabine Sennhenn-kirchner. Betreuer: Michael Hülsmann." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://d-nb.info/1058250361/34.
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Козоріз, А. В. "Розробка установки автоматизованого контролю якості обсадних труб." Thesis, Івано-Франківський національний технічний університет нафти і газу, 2003. http://elar.nung.edu.ua/handle/123456789/3991.
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Показано, що одними з основних параметрів COT, які відповідають за експлуатаційну надійність обсадної колони і можуть бути визначені методами неруйнівного контролю, є овальність та ексцентриситет. На основі проведених теоретичних досліджень розроблені способи та встановлені аналітичні залежності для визначення овальності та ексцентриситету COT. Експериментально досліджено характер залежності між основними параметри контролю та характеристиками дефектів. Розроблено та впроваджено у виробництво комплекс технічних засобів і технологій, які дозволяють проводити автоматизований вхідний контроль якості обсадних труб.Обзор современных технических средств и технологий контроля качества элементов и соединений трубных колонн показывает, что, не смотря на широкое использование в нефтегазовой области методов неразрушающего контроля, вопрос комплексного контроля стальных обсадных труб (СОТ) остается нерешенным. По данным Американских нефтегазовых компаний в США на трубных базах после проверки обсадных труб на соответствие действующим стандартам отбраковывается до 20% общего количества проверенных труб. Учитывая то, что аварии с обсадными трубами составляют 7-8% всех аварий в бурении, на их ликвидации расходуется свыше 10% времени, которое приходится на ликвидацию аварий всех видов, задача разработки и внедрения методов и средств контроля СОТ является, безусловно, актуальной. Входной контроль СОТ с помощью разработанных технических средств и технологий обеспечит недопущение к эксплуатации труб с дефектами, а также позволит формировать обсадную колонну в соответствии с фактическим техническим состоянием СОТ. ель работы состоит в разработке методов, технических средств и технологий автоматизированного контроля стальных обсадных труб в условиях баз производственного обслуживания нефтегазодобывающего предприятия. Практическое значение полученных результатов состоит в том, что разработанные технические средства и технологии реализованы в комплексной установке контроля основных параметров СОТ, внедренные в производство. Разработанные методы и технические средства прошли промышленные испытания на базе производственного обслуживания Хрестищенского УБР ДК "Укргаздобыча" и в Научно-производственной фирме "Зонд".
Is shown, that some of basic parameters of casing pipes, which are responsible for operation reliability of casing string are ovality and eccentricity. These parameters can be defined by methods of non-destructive testing. On the basis of the carried out theoretical researches the designed ways also are established analytical dependences for definition of casing pipes ovality and eccentricity. Character of dependence between basic parameters of testing and defect characteristics was investigated experimentally. Is developed and entered into manufacture the complex of means and techniques which allow to carry out the automated entrance inspection of quality of casing pipes.
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Ovali, Fatih. "Efficient Analysis Of Large Array Antennas A Thesis Submitted To The Graduate School Of Natural And Applied Sciences Of Middle East Technical University By Fatih Ovali In Partial Fulfillment Of The Requirements F." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605652/index.pdf.
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Large phased array antennas are widely used in many military and commercial applications. The analysis of large arrays containing many antenna or frequency-selective (FSS) surface elements is inefficient or intractable when brute force numerical methods are used. For the efficient analysis of such structures hybrid methods (analytic and numerical, numerical and numerical) can be used. In this thesis, a hybrid method combining the uniform geometrical theory of diffraction (UTD) and the moment method (MoM) used for the analysis of large, finite arrays is modified for the efficient yet accurate analysis of large printed dipole arrays. In the present hybrid UTD-MoM approach, the number of unknowns to be solved is drastically reduced as compared to the conventional MoM approach, which provides a great efficiency on the computational cost. This extreme reduction in the number of MoM unknowns is carried out by introducing a few UTD-ray type global basis functions for the unknown array element currents. In this study, this hybrid UTD-MoM method is applied to the analysis of a finite, planar periodic array of printed dipoles on a grounded dielectric substrate. The efficiency and accuracy of this hybrid method are demonstrated with some numerical results.
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NGUYEN-THI, Van-Oanh. "SPECTROSCOPIE ET STABILITE DES HYDROCARBURES AROMATIQUES POLYCYCLIQUES DANS LES CONDITIONS DU MILIEU INTERSTELLAIRE." Phd thesis, Université Paris Sud - Paris XI, 2003. http://tel.archives-ouvertes.fr/tel-00005244.
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Ce travail porte sur la dynamique intramoléculaire des Hydrocarbures Aromatiques Polycycliques soumis aux conditions du milieu interstellaire (PAH isolé rotationnellement froid mais vibrationnellement excité). Des études théoriques et expérimentales ont été menées sur leur deux voies de relaxation: émission IR ou fragmentation. Le spectre d'absorption IR a été obtenu par dynamique moléculaire couplée à une méthode semi-classique Adiabatic Switching. La dynamique a été réalisée sur une surface de potentiel semi-empirique Tight-Binding dans le but de simuler tous types de PAHs pouvant dépasser une centaine de carbones (systèmes encore inaccessibles aux expériences et aux calculs ab-inito). Une paramétrisation du potentiel adaptée aux PAHs a été développée ainsi qu'un modèle donnant la densité d'états anharmonique quantique. La simulation spectrale reproduit les grandes tendances en fonction des variables pertinentes en astrophysique: rôle de l'ionisation fort changement de l'allure du spectre et de l'intensité totale absolue), et de la température (décalage vers le rouge, élargissement et modification des intensités des bandes), effet d'anharmonicité (énergie de point zéro, fréquences), et de structure (compacité, cycle pentagonal et taille). La cinétique de fragmentation (induite par absorption séquentielle de photons) d'un hydrogène du cation fluorène (ionisation REMPI) a été étudiée à l'aide d'un jet supersonique et d'un spectromètre de masse. Cette méthode expérimentale originale a permis de déterminer la section efficace absolue d'absorption, d'analyser son atténuation avec le nombre de photons absorbés et l'évolution de la constante de dissociation dans un domaine d'énergie relativement large. Une attention particulière a été portée sur les techniques d'analyse des données. (la loi de Poisson, matrice de branchement, la loi cinétique, matrice d'évolution, simulation de la forme de signaux du spectromètre). Un ajustement libre de la variation de cette constante est proche de celui du modèle statistique PTD mais très différent à basse énergie du modèle RRK. L'énergie d'activation obtenue par ces deux modèles est compatible avec celle déduite du potentiel Tight-Binding.
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Chen, Ming-Ren, and 陳銘仁. "Genetic Structure of Halophila ovalis (R.Br.) Hook. f. in Taiwan." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/80535859541321637807.
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碩士國立海洋大學
海洋生物研究所
85
In the present study, the morphological and enzymic characters of Halophila ovalis (R.Br.) Hook.f. from Taiwan and Peng-Hu were investigated. The species is rather variable in morphology and with significant differences between 10 populations. In the analyses of isozymes, 7 among the 10 loci are polymorphic with 41% in avarage. The observed value of heterozygosity ranges from 0.000 to 0.250, while the expected value of heterozygosity ranges from 0.000 to 0.311. The number of alleles per locus ranges from 1.10 to 1.60, while the effective number of alleles per locus is from 1.012 to 2.952. Results of Chi-sqauare and F-tests showed that heterozygosity of Halophila ovalis is rather low and far from the Hardy-Weinberg Equilibrium. According to the pattern of genetic variability, 32.25% of variation occurs between populations while 67.75% is present within each population. Obviously, interpopulational genetic exchange is rather low, and the geological location is not correlated to genetic distance. In summary, the genetic variation of Halophila ovalis is higher than other seagrasses and freshwater plants, such high differentiation and variability may be caused by its potential to adapting diversed habitats and wide distribution.
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Wu, Kuo-yen, and 吳國彥. "Testing of dispersal method in Thalassia hemprichii and Halophila ovalis." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56746069259748297271.
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碩士國立中山大學
海洋科學系研究所
104
Thalassia hemprichii and Halophila ovalis are two widely distributed seagrasses in Indo-West Pacific Ocean. In this study we investigated their dispersal mechanisms. Threehypotheses are proposed and tested: 1. dispersal by current 2. transported by birds, 3. transported by fishes. I used plants at different stages-adult plants,seedling,fruits and seeds to test these three hypotheses.Samples of Thalassia hemprichii and Halophila ovalis were collected from Dongsha Atoll in 2013 and 2014.Adult plants of Thalassia hemprichii could remain floating and survive for at least 2 months, longer than the seedlings which could have one month floating stage if unattached to substrate. Fruits of Thalassia hemprichii could remain floating for two weeks and release germinable seeds., but germination rates decline with longer floating time. Adult plants of Halophila ovalis could only float for one weeks before dying. The seeds of Halophila ovalis could pass through animal gastrointestinal tracts and remain competent for germination ,but seeds of Thalassia hemprichii could not. These two seagrasses use different dispersal mechanisms.
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Hsu, Chi-Hsuan, and 徐季玄. "Dispersal mechanisms of the Halophila ovalis population in Taiwanese waters." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/x6w95v.
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碩士國立中山大學
海洋生物科技暨資源學系研究所
107
In recent years, climate change, coastal development and marine pollution are causing dramatic decline of marine ecosystems, especially seagrass ecosystem which locates exclusively in subtidal zone. Understanding their dispersal mechanisms and connectivity are very important for restoration, conservation and management of seagrasses. Halophila ovalis (R. Brown) J. D. Hooker is a wildly distributed species in the Indo-Pacific. Around Taiwanese water, it can be found in Tainan, Penghu Islands and Dongsha Atoll. Previous literature indicated their fruits and seeds which digested by birds were have a much higher germination rate. Therefore, the biotic vector such as migratory birds may play an important role on their long distance dispersal. If the migratory shore birds are responsible for carrying new recruits from different geographic populations (countries), a temporal genetic structure shift could be expected. In this study, we performed the sampling for consecutive years in Penghu, Qigu and Dongsha Atoll to reveal a possible temporal population structure shift to test the biotic dispersal hypothesis. A temporal genetic structure shift between 2017 and 2018 was observed, and all the populations have unique genetic structure. This indicates low dispersal capacity and local adaptation may play an important role on shaping the genetic structure of H. ovalis among sites within year, however, temporal genetic structure shift between years might result in fast turnover rate of seed bank.
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Hsu, Yao-Yu, and 許曜羽. "Population connectivity of Halophila ovalis in the Indo-West Pacific." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6muh2j.
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碩士國立中山大學
海洋生物科技暨資源學系研究所
107
Seagrass, as marine angiosperms, plays an important role in coastal ecosystems. Understanding the population connectivity between geographic regions is important for their future restoration. Halophila ovalis is distributed in the Indo- West Pacific and can produce recruits through both asexual and sexual reproduction. The former uses rhizomatous rametes or rhizome fragments to disperse, the latter uses seeds to achieve the purpose of expanding their population. Since it’s fruits and seeds have negative buoyance and the seeds of H. ovalis could pass through the digestive tract of waterfowls and lead to higher germination rates than un-ingested controls. Therefore, biological vectors (i.e. migratory birds) may be a possible mechanism for long-distance dispersal. In this study, we collected 625 samples from 23 sites to understand the population connectivity of H. ovalis in the Indo-West Pacific. ITS and microsatellite loci were used to barcode and reveal the population connectivity pattern, respectively. According to the result, 432 samples of H. ovalis from 17 sites were used in this study. High level genetic diversity was found within 17 populations. The results of FST analysis showed that significant genetic differentiation was found among H. ovalis populations in the Indo- West Pacific. The results of STRUCTURE analysis showed that most of H. ovalis populations in the Indo- West Pacific possess unique genetic composition. Indicate that the gene flow between H. ovalis populations in the Indo- West Pacific is limited, therefore, long-distance dispersal by migratory birds is unlikely the main mechanism for shaping their connectivity pattern, and we suggest at least three cryptic species may occur within its distribution.
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Franzen, Olaf [Verfasser]. "Katheterinterventioneller Verschluß von Vorhofseptumdefekten und offenen Foramina ovalia / vorgelegt von Olaf Franzen." 2001. http://d-nb.info/968467121/34.
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Chang, Jing-Chou, and 張錦洲. "Studies on artificial rearing of an aquatic firefly, Luciola ovalis Hope, in Taiwan." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/20493747882837163837.
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碩士國立中興大學
昆蟲學系
82
Luciola ovalis Hope is one of the aquatic fireflies commonly distributed in Taiwan. Based on the present obervations by ficial rearing, its adult longevity was found to be ca. 10 days; pupal period, ca. 7 days; larval stage, ca. 90 days and egg period, ca. 25 days. It took about 120 days to complete the whole life cycle. The larvae could feed on at least 10 smallils as their food. The matured larvae climbed up from water to the ground for pupating in a soil chamber. Each female could lay about 100 eggs in her life. Artificial rearing of the firefly with a river snail was carried out in a glass tank equipped with an air pump andting lamps. The rearing conditions were set up at 22.5 ±2.5℃, water temperature; and L:D=14:10, photoperiod. Each instar was judged by measuring body length and prothorax length and width of the reared larvae. The larval survival was recorded 80s after rearing and was found to be 94.6% by the shallow rearing tank and 91.2% by the deep tank. The period for 50% adult emergence was 148 days by the shallow tank and 167 days for the deep one. An artificial diet was developed for rearing this firefly. The diet is composed of above 50% animal proteins to which were added fat, dextrose, vitamins, starch and sweet rice powder. The rearing on this diet was conducted in a plastic tray equipped with an air pump. The results showed that the larvae took 208s to reach 50% adult emergence. This artificial diet wasfor rearing 4th to 6th instar larvae than for 1st to 3rd instars.
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Wang, Chain-Ji, and 王前智. "Functional responses of Amblyseius ovalis (Acari: Phytoseiidae) preying on Tetranychus uritcae (Acari: Tetranychidae) and their spatial distribution." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/28913271129707660990.
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碩士國立中興大學
昆蟲學系
83
The population distributions of Amblyseius ovalis (Evans) and Tetranychus urticae Koch were evaluated by the values of indices and their distribution─uniform, random, and aggregative distribution types, according to the hypotheses of (1) index of dispersion (ID), (2) Green''''s coefficient of dispersion (Cx), (3) Lloyd''''s mean crowding index (mc), (4) Lloyd''''s patchiness index (mc/m), (5) Morisita''''s coefficient of dispersion ( Iδ, Iβ), (6)Taylor''''s power law regression with intercept (㏒a) and sloped (7) Iwao''''s patchiness regression (α, β). The frequencies of distribution types of mites'''' populations mearsured by week or by stages were accordingly rearranged and utilized to assess the appropriate type of distributions. A. ovalis and T. urticae population in the field were either aggregative or random type. Predator-prey relationship was demostrated by A. ovali feeding on T. urticae. The responses of daily predation rate and predation rate curve of A. ovalis on 8 prey densities of T. urticae showed a Holling'''' s typeΠ and type Ⅲ responses─functional responses of predator. Non-linear regression model was used to fit daily predation rates on the different prey densities and found 43 functional response equations which included the independent variables of (1) predator''''s stages, sexes, and feeding history prey'''' s species, stages, and sexes, (3) habitat substrates and sizes, and (4) temperatures. The fitted regression equations were used to find out the theoretical attack rates (a) and handling time (Th) under different tested conditions. Those a'''' s and Th''''s were also variate with the tested conditions by which the interactions and relations between the predator and the prey were interpreted and discussed.
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Pai, Kuei Fang, and 白桂芳. "Interactions between Amblyseius ovalis (Evans) (Acarina: Phytoseiidae) and Bemisia argentifolii Bellows & Perring (Homoptera: Aleyrodidae) on Cucumber." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94556318979212785598.
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博士國立中興大學
昆蟲學系
91
Both male and female silverleaf whitefly (SLWF), Bemisia argentifolii Bellows and Perring, feeding on cucumber, matured in 19.7 ~ 19.9 days at 28 ℃. Adult females laid 101 eggs in 25.6 days of oviposition period with a rate of 3.64 eggs per female per day. Peak reproduction rate was found at either day 4 (6.52 eggs/female/day) or day 8 females (6.02 eggs/female/day). SLWF population multiplied 101.5 times in a mean generation time of 29.6 days with 0.156 eggs/female/day of intrinsic rate of increase. The strategies successes used by SLWF for host adaptation, if not on all kinds of hosts but at least in cucumbers, are maturity rate and adult longevity instead of reproduction rate. Feeding on cucumber pollen, 68.8% Amblyseius ovalis (Evans) females developed into adults, but none on honey-dew of silverleaf whitefly (Bemisia argentifolii, SLWF). Females of A. ovalis deposit most of their eggs on the top of chaeta of underside of leaves with 26.8 eggs per female in an average of a 24.4 day life span. The daily reproduction rate per female is 1.1 eggs. Two highest daily reproduction rates (2.0 ~ 2.1 eggs/female/day) of females were found at female aged 4 and 8 ~ 10 days; the female sex ratio (female/ (female + male)) of offspring was 0.68. A total of 16.7% females feeding on cucumber pollen did not reproduce eggs, but the females resumed egg reproduction when first instars of SLWF were supplied. A. ovalis feeding on eggs, 1st and 2nd instar of silverleaf whitefly, Bemisia argentifolii has shorter developmental duration, better survival rate, and longer longevity. All the predator females reproduced eggs when they fed on the 1st or 2nd insatr of SLWF, but only 50.0 % did on SLWF eggs and 61.1 % did on eggs and pollen. Feeding on 2nd instar of SLWF with pollen, A. ovalis females gave the highest fecundity, while A. ovalis feeding on eggs with pollen added gave the lowest one. The daily reproduction rates (0.1 ~ 1.3 eggs/♀♀/day) of A. ovalis were significantly varied due to stages of SLWF preys. The net reproductive rate (Ro) of 4.28 ~ 21.86 and the intrinsic rate of increase (rm) of 0.140 ~ 0.288 and generation time (T) of 10.41 ~ 12.17 days were found while A. ovalis fed on tested stages of SLWF. The larvae of predator didn’t prey on SLWF, but other stages (protonymph, deutonymph and female) foraged an average of 43.9 first instar or 16.7 second instar of SLWF in the life-time of A. ovalis. Deutonymphs and females of A. ovalis showed a Holling typeⅡfunction when it fed on eggs and immature stages of SLWF. Female of A. ovalis retained the highest daily predation rate (predation plateau) 5.88 nymphs in 4 cm2 leaf disc at prey density of 28 1st instar nymphs in 24 hours (a: 0.6286, Th: 0.1723). A. ovalis female showed highest daily reproduction rate of 1.0 ~ 1.5 eggs/female/day when offered 24 ~ 32 nymphs in 4 cm2 leaf disc. Consequently, the stage-specific effects of SLWF were found and evaluated from the response of developmental duration, pre-oviposition period, oviposition period, longevity, fecundity, sex ratio of progeny, and intrinsic rate of increase of A. ovalis. The variations on functional and numerical responses of A. ovalis were also correlated to the different B. argentifolii stages. Feeding on SLWF, A. ovalis completed its maturity with high survival rate and reproductive rate. Furthermore, the development rate, longevity and fecundity of A. ovalis were enhanced when the additional cucumber pollen was added. We conclude that A. ovalis prefers SLWF 1st and 2nd instars later instead of eggs; therefore, SLWF 1st and 2nd instars are suitable food for population growth of A. ovalis. The vertical distribution of Bemisia argentifolii was stage-specific by eggs, nymphs and adults on cucumber. Adults and eggs appeared at upper leaves, while the 1st & 2nd instar nymphs and 3rd & 4th instar nymphs appeared at middle and lower leaves, respectively. A high density of active stages of Amblyseius ovalis was attracted by the 1st and 2nd nymphs of whitefly which aggregated on the middle leaves. The spatial distribution patterns of B. argentifolii and A. ovalis were aggregated according to Taylor’s Power Law (a: 0.401, b: 1.257 and a: 0.311, b: 1.074) and Iwao’s Mean Crowding Regression (α: 1.325, β: 1.090 andα: 1.477, β: 1.014). Population densities of both predacious mite and whitefly did not depend on temperature in summer season (Jun. ~ Sep.) but did in the period of October to May. A. ovalis or B. argentifolii did not positively correlate with weekly precipitation. Population density increases of A. ovalis and B. agrentifolii on cucumber appeared highly synchronized (Y = 0.4458x + 0.4123, R2 = 0.7740, p < 0.0001). Apparently, the A. ovalis was an important density dependent factor of B. argentifolii on cucumber. A. ovalis showed same degree of effectiveness as chemical measures did to suppress SLWF population increases on cucumbers. The cucumber yield was 1.74 times on A. ovalis released plots than the no predator released plots. In order to gain a better suppression on SLWF density and a higher yield of cucumber fruitage, we released A. ovalis of 7 adults/plant or 14 adults/plant. Inoculative release of A. ovalis in cucumber field could increase the cucumber yield at the lower population density of SLWF. We suggest that A. ovalis can be adopted for integrated control of SLWF with carefully selected pesticides.
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Naidoo, Yougasphree. "Ultrastructural features of the leaf blade epidermis and squamulae intravaginales of the marine angiosperm Halophila Ovalis (R.Br.) Hook.f." Thesis, 1986. http://hdl.handle.net/10413/9952.
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Chen, Chia-Ming, and 陳佳明. "Taxonomy of Hippidae and Reproductive Ecology of Hippa ovalis (A. Milne-Edwards, 1862) (Crustacea: Decapoda: Anomura) in Taiwan." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/42504698143557831577.
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碩士國立臺灣海洋大學
環境生物與漁業科學學系
98
Abstract Hippidae belongs to the Infraorder Anomura, Order Decapoda, Class Malacostraca, Subphylum Crustacea. There are two genera and six species of hippid crabs of Taiwan in this study, including Hippa adactyla Fabricius, 1787, H. admirabilis (Thallwitz, 1892), H. marmorata (Hombron & Jacquinot, 1846), H. ovalis (A. Milne-Edwards, 1862), H. truncatifrons (Miers, 1878) and Mastigochirus gracilis (Thallwitz, 1892). H. marmorata is a new record from Taiwan. The morphological characters, identification keys, line drawings and color photographs of these species are provided as useful information for the studies in the future. There are approximately 27 known hippid species in the world. The hippids from Taiwan is about 22.2 % of the world or 35.2 % of the Indo-West Pacific. The hippid diversity of Taiwan is the highest in the Indo-West Pacific. The reproductive ecology of H. ovalis from the intertidal zone near the estuary of Nan-ao River, Yilan County was studied. A total of 2029 specimens (1317 females and 712 males) of H. ovalis were collected from November, 2008 to December, 2009. Carapace length of female ranged from 9.2 to 36.9 mm, with mean carapace length 21.8±3.6 mm. Carapace length of male ranged from 11.0 to 26.1 mm, with mean carapace length was 18.8±2.0 mm. There is significantly difference (p < 0.05) in the ratios of carapace length and carapace width, carapace length and body weight between the sexs according to the analysis of covariance. The monthly sex ratios were significant difference (p < 0.05) from 1:1 in Chi-square test. Females outnumbered males in each monthly sample. H. ovalis are multiple spawners and reproduce all year round. Its main reproductive season is from May to October, with a peak in June and July. The fecundity and mean egg diameter (non-eyed) were 660 to 16817 eggs and 527±28 μm, respectively. The carapace length at first sexual maturity of female was around 18.1 mm, and male was around 16.0 mm. The reproductive activity of H. ovalis was significantly affected by air temperature from the multiple regression analysis. H. ovalis were parasitized by Halysiorhynchus macrocephalus (Shipley & Hornell, 1906) larva which belongs to the Phylum Platyhelminthes, Class Cestoda, Order Trypanorhyncha, Family Mixodigmatidae. H. macrocephalus is a new record from Taiwan. There is no evidence showing that how the parasite affected the reproduction of its host, H. ovalis.
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Kirsch, Hinnerk. "Häufigkeit von persistierenden Formina ovalia (PFO) und kernspintomographisch pathologischen cerebralen Strukturen bei uneindeutigen Dekompressionskrankheiten mit neurologischen Symptomen (DCS II)." 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015430559&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Hamann, Fiona [Verfasser]. "Untersuchung der Ursachen von Luftembolien während eines katheterinterventionellen Verschlusses von Vorhofseptumdefekten und offenen Foramina ovalia / vorgelegt von Fiona Hamann." 2009. http://d-nb.info/996437126/34.
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Hallai, Julian de Freitas. "On the effect of Lüders bands on the bending of steel tubes." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4588.
Full textAbstract:
In several practical applications, hot-finished steel pipe that exhibits Lüders bands is bent to strains of 2-3%. Lüders banding is a material instability that leads to inhomogeneous plastic deformation in the range of 1-4%. This work investigates the influence of Lüders banding on the inelastic response and stability of tubes under rotation controlled pure bending. It starts with the results of an experimental study involving tubes of several diameter-to-thickness ratios in the range of 33.2 to 14.7 and Lüders strains of 1.8% to 2.7%. In all cases, the initial elastic regime terminates at a local moment maximum and the local nucleation of narrow angled Lüders bands of higher strain on the tension and compression sides of the tube. As the rotation continues, the bands multiply and spread axially causing the affected zone to bend to a higher curvature while the rest of the tube is still at the curvature corresponding to the initial moment maximum. With further rotation of the ends, the higher curvature zone(s) gradually spreads while the moment remains essentially unchanged. For relatively low D/t tubes and/or short Lüders strains, the whole tube eventually is deformed to the higher curvature entering the usual hardening regime. Subsequently it continues to deform uniformly until the usual limit moment instability is reached. For high D/t tubes and/or materials with longer Lüders strains, the propagation of the larger curvature is interrupted by collapse when a critical length is Lüders deformed leaving behind part of the structure essentially undeformed. The higher the D/t and/or the longer the Lüders strain is, the shorter the critical length.
This class of problems is analyzed using 3D finite elements while the material is modeled as an elastic-plastic solid with an “up-down-up” response over the extent of the Lüders strain, followed by hardening. The analysis reproduces the main features of the mechanical behavior provided the unstable part of the response is suitably calibrated. The uniform curvature elastic regime terminates with the nucleation of localized banded deformation. The bands appear in pockets on the most deformed sites of the tube and propagate into the hitherto intact part of the structure while the moment remains essentially unchanged. The Lüders-deformed section has a higher curvature, ovalizes more than the rest of the tube, and develops wrinkles with a characteristic wavelength. For every tube D/t there exists a threshold of Lüders strain separating the two types of behavior. This bounding value of Lüders strain was studied parametrically.text
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Jaw, Yuan-ning, and 趙元寧. "Study on the seasonal variation of biomass and the effect of temperature and salinity on seed germination of Halophila ovalis in Penghu." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/399fvr.
Full textAbstract:
碩士國立澎湖科技大學
水產養殖系水產資源與養殖碩士班
106
The coverage of seagrass Halophilaovalis in Citou Bay is the highest of all the seagrass meadows in Penghu. It has high ecological importance because there are abundant species of creatures. However, the distribution of the seagrass meadow is shrinking because of the influence of human disturbance and environmental changing. In this study, it revealed that the coverage dropped twice in a year, during July to August and December to February. The third pair of leaves was obviously smaller during the high-water temperature period of July to August. There were two peaks of biomass, rhizome length, and leaf amount during April to July and November to January; moreover, blooming and fruiting periods appeared as well. The ratio of shoot system to root system were 0.49±0.11. There were four undulations of the curve showed that it has a short life cycle and rapid growing speed. The length of rhizome grew longer during October to January for anchoring in the monsoon season. There was the best growth rate under the salinity of 25 and 35ppt and the temperature of 30℃. After germinating, the cotyledon extended and radicle stretched, and then the first to the fifth leaf and the first pair of buds grew consecutively. Low salinity would not only promote the germination rate but also shorten the time frame of germination. There was no statistical significant difference of germinate rate between the group with and without artificial light. However, the average germination days of the group without artificial light was obviously shorter than the other. Providing light to the young seedlings would be helpful on growing more leaves. Considering the growth of young seedlings, the best germination condition would be under the salinity of 10ppt with light, although the best germination index was the condition under the salinity of 5ppt without light. Therefore, the best preservation condition for seagrass seeds was 10℃ and 35ppt. Keywords: Halophila ovalis, biomass, germination
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Adler, Carolin. "Vergleichende In-vitro-Studie zur Entfernung der medikamentösen Einlage Kalziumhydroxid aus runden und ovalen Wurzelkanälen. Vergleich von passiver Ultraschallspülung und SAF: Eine Micro-Computertomographie-Studie." Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5F21-E.
Full textAbstract:
Ziel der Studie: Vergleich zweier Methoden zur Entfernung der medikamentösen Einlage Kalziumhydroxid aus runden und ovalen Wurzelkanälen mithilfe eines Micro-CTs.
Material und Methode: Es wurden 80 extrahierte menschliche Prämolaren und Inzisivi verwendet. Die Wurzelkanäle wurden von koronal auf eine einheitliche Länge von 18 mm gekürzt und mit dem FlexMaster-System (VDW, München) bis zu Größe 40/.04 präpariert. Nach jeder Instrumentengröße wurden die Kanäle mit 2 ml 3%igem Natriumhypochlorit gespült. Die Spülung erfolgte mit einer 2 ml Spritze und einer Nadel der Größe 30 (NaviTip 30 Gauge, Ultradent, München). Die Applikation des Kalziumhydroxidpräparates (UltraCal XS. Ultradent Products Inc., Utah, USA) wurde mit einer Injektionsnadel der Größe 30 durchgeführt. Eine anschließende röntgenologische Kontrolle sicherte die vollständige und homogene Verteilung des Präparates im Wurzelkanal. Alle Probenzähne wurden für sieben Tage bei 37°C Lufttemperatur und 100% Luftfeuchtigkeit gelagert. Nach Anfertigung präoperativer Micro-CT-Scans von jedem Wurzelkanal erfolgte eine Volumenbestimmung der applizierten Kalziumhydroxideinlage. Außerdem konnten die Proben anhand der Bilddaten einer runden oder ovalen Querschnittsform zugeteilt werden. Anschließend erfolgte die Einteilung der Probenzähne in vier Gruppen; Gruppe 1 (n = 10, ovale Querschnittsform), Gruppe 2 (n = 10, ovale Querschnittsform), Gruppe 3 (n = 30, runde Querschnittsform), Gruppe 4 (n = 30, runde Querschnittsform). Die Gruppen 1 und 3 wurden dem Spülprotokoll der Self-Adjusting File (SAF) zugeteilt, die Gruppen 2 und 4 dem der passiven Ultraschallspülung (PUI). Das Spülprotokoll beider Entfernungsmethoden sah eine 4-minütige Anwendung, aufgeteilt in 8 jeweils 30 Sekunden lange Zyklen und eine Gesamtspülmenge von 20 ml 3%igem Natriumhypochlorit vor. Die Auswertung erfolgte durch Anfertigung postoperativer Micro-CT-Scans und erneute Bestimmung des verbliebenen Volumens an medikamentöser Einlage. Zur statistischen Auswertung wurde der Quotient aus Volumen nach der Entfernung zu dem Volumen vor der Entfernung berechnet und eine zweifaktorielle Varianzanalyse (ANOVA) durchgeführt.
Ergebnisse: Keine der verwendeten Methoden konnte eine vollständige Entfernung der medikamentösen Einlage Kalziumhydroxid erreichen. Die SAF-Spülung erreichte signifikant bessere Ergebnisse als die PUI. Es konnte kein signifikanter Einfluss der Kanalform (rund/oval) auf die Reinigungswirkung beider Systeme festgestellt werden.
Schlussfolgerung: Das SAF-System entfernt Kalziumhydroxid effektiver aus runden und ovalen Wurzelkanälen als die passive Ultraschallspülung. Mit beiden Systemen konnten relativ saubere, aber keine vollständig von Kalziumhydroxid gereinigten Kanalwände erzielt werden.
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VINH, NGUYEN THANH, and 阮成永. "Biology, life table parameters and predation rates of Neoseiulus womersleyi (Schicha) and Euseius ovalis (Evans) feeding on four tetranychid mites (Acari: Phytoseiidae, Tetranychidae) and two kinds of pollen." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/02442590320277872176.
Full textAbstract:
博士國立中興大學
昆蟲學系所
100
ABSTRACT The development, life table and predation rates of the predatory mites Neoseiulus womersleyi and Euseius ovalis feeding on four tetranychid mites and two kinds of pollen was studied in a chamber at 25°C, 75±5% RH and 16:8 (L:D) photoperiod. Immature stages of N. womersleyi feeding on Tetranychus urticae and T. kanzawai had shorter development duration (4.71 and 5.02 days for females, 4.77 and 5.19 days for males, respectively) than those feeding on other food sources. Immature stages of E. ovalis females feeding on Oligonychus mangiferus and T. urticae developed in 4.99 and 5.13 days, respectively, the shortest developmental duration measured. Immature stages of E. ovalis males feeding on O. mangiferus and T. urticae developed in 5.12 and 5.37 days, respectively. The longevity of N. womersleyi males (13.31 to 14.51 days) and females (17.67 to 21.81 days) feeding on T. urticae, T. kanzawai or maize pollen was longer than the longevity of N. womersleyi feeding on O. mangiferus, P. citri or loofah pollen. Euseius ovalis males (12.91 to 16.74 days) and females (16.24 to 23.77 days) feeding on O. mangiferus, T. urticae or maize pollen lived longer than E. ovalis males and females feeding on T. kanzawai or Panonychus citri or loofah pollen. Among all of the food sources tested, the fecundity of N. womersleyi was high (33.57 eggs/female) on T. urticae, but low on P. citri (17.63 eggs/female), whereas E. ovalis was high (35.86 eggs/female) on O. mangiferus and low (8.89 eggs/ female) on T. kanzawai. Sex ratio differed among food sources and ranged from 0.67 to 0.78 for N. womersleyi and from 0.68 to 0.78 for E. ovalis. In addition, female sex ratios of N. womersleyi and E. ovalis in the field also changes, higher sex ratio in June, July and November, and lower sex ratio was found in August, September and December. The highest net reproductive rate (R0 = 24.86 offspring/individual) and intrinsic rate of natural increase (rm = 0.254/day) were found in N. womersleyi feeding on T. urticae and T. kanzawai, respectively; the lowest R0 (9.88 offspring/individual) was recorded on O. mangiferus and the lowest rm (0.179/day) was on loofah pollen. When feeding on O. mangiferus, E. ovalis had a higher R0 (26.46 offspring/individual) and rm (0.256/day) than those fed on other food sources. Neoseiulus womersleyi immatures consumed 9.73 T. urticae eggs, 13.53 larvae, or 11.57 protonymphs, while gravid females consumed 12.13 T. urticae eggs, 14.37 larvae, or 12.07 protonymphs daily. Female N. womersleyi consumed a total of 218.12 T. urticae eggs, 260.85 larvae, or 222.33 protonymphs, while male N. womersleyi consumed a total of 96.39 T. urticae eggs, 112.23 larvae, or 99.65 protonymphs. When O. mangiferus larvae or protonymphs were offered to E. ovalis, immatures consumed 18.57 larvae or 17.47 protonymphs. Gravid females consumed 16.83 larvae or 12.83 protonymphs daily, with a total of 330.68 larvae or 252 protonymphs. Adult E. ovalis males consumed fewer O. mangiferus larvae (107.69) or protonymphs (91.51) than females. Conversion rate of predation to reproduce was expressed as “Food-reproduction exchange rate” of N. womersleyi was lower on T. urticae than on T. kanzawai. E. ovalis showed a higher food-reproduction exchange rate on O. mangiferus than on T. urticae.
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"EFFICIENT ANALYSIS OF LARGE ARRAY ANTENNAS A THESIS SUBMITTED TO THE GRADUATE SCHOOL OF NATURAL AND APPLIED SCIENCES OF MIDDLE EAST TECHNICAL UNIVERSITY BY FATÝH OVALI IN PARTIAL FULFILLMENT OF THE REQUIREMENTS F." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605652/index.pdf.
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Benham, Claudia. "Understanding and governing the social-ecological impacts of industrial development in the coastal zone: A transdisciplinary case study analysis of Liquefied Natural Gas development in the Great Barrier Reef World Heritage Area." Phd thesis, 2016. http://hdl.handle.net/1885/118269.
Full textAbstract:
Coastal zones are complex and highly productive social-ecological
systems (SES), but their resilience is increasingly threatened by
a range of human activities including land use change and the
expansion of port infrastructure associated with the global
movement of minerals, petroleum products and other commodities.
Over the last decade, the gas industry has emerged as a key
driver of port development as it seeks to rapidly develop
unconventional resources such as Coal Seam Gas (CSG). In many
cases, unconventional gas developments are accompanied by the
construction of coastal infrastructure including gas processing
and liquefaction plants, pipelines and shipping facilities, used
for export and import of refined gas products. This brings the
gas industry into increasingly close contact with marine and
coastal ecosystems.
Seagrasses (marine flowering plants) are among the habitats most
at risk of disturbance associated with port development. Seagrass
meadows are critical to the health of marine ecosystems, playing
an important role as a coastal filter for sediment and nutrients,
acting as foraging and nursery habitats for wildlife, and storing
carbon and other greenhouse gases (GHGs) in the oceans. The loss
of seagrass meadows can therefore have secondary impacts on the
broader ecosystem, including on the wildlife that depend on them
for habitat, including fish, benthic invertebrates, marine
turtles and sirenians (dugongs and manatees). Many of these fauna
species are facing localised declines across the world as a
result of multiple pressures including loss of foraging and
breeding habitat, an increase in marine pollutants and fishing
pressure. Adding to this complexity, infrastructure developments
along the coastline are embedded within complex networks of
human-environment interactions and as such, their ecological and
social impacts are intimately linked. Human communities are
affected by the environmental, social and economic changes that
are associated with large-scale industrial developments,
including a deterioration in ecosystem services, higher living
costs, increased burden on healthcare and other community
services and public safety concerns, in addition to economic
benefits. Because coastal counities are intimately connected to
the environment through the exchange of material inputs and
ecosystem services, degradation of the local environment also has
ramifications for local livelihoods and quality of life.
Australia is currently the world’s leading exporter of coal,
and is expected to become the largest global exporter of
Liquefied Natural Gas (LNG) by 2018-19. Six LNG facilities are
currently in operation or development around the country, three
of which are located inshore of the Great Barrier Reef (GBR) on
the north-eastern coast of Queensland. The GBR is perhaps best
known for the natural values that make it one of the great
wonders of the world, but it is also home to a number of large
industrial ports and the subject of ongoing port development
proposals. The proposed expansion of port development in the
Great Barrier Reef World Heritage Area (GBRWHA) to support growth
in the LNG and coal sectors prompted the World Heritage Council
to review Australia’s management of the GBRWHA in 2012, placing
the World Heritage status of the GBR in question. The review
expressed strong concerns about the capacity of current
governance structures to protect the ecosystems of the GBR, given
the unprecedented scale and speed of industrial development along
its margins, and highlighted the need to better understand the
impacts of such developments on the ecology of the GBR and the
local communities whose wellbeing and livelihoods depend on its
resources. Although there has been much research on the social,
economic and environmental impacts of inland CSG infrastructure,
this has not been the case for coastal LNG plants and associated
port developments.
With this in mind, this thesis sought to understand how recent
forms of industrial development affect complex SES in the GBRWHA
through an in-depth case study of the Port of Gladstone, where
recent LNG development has led to concerns over port impacts to
the marine environment and social wellbeing among the local
community. In so doing, I employed a trandisciplinary methodology
comprising a suite of ecological and social research methods,
which was subsequently developed into a broader framework for
application to other contexts. The first phase of the research
involved a survey of local residents in the Gladstone Region,
which revealed that impacts of port development on water quality,
fish health and seagrass meadows, and the socio-economic impacts
associated with rapid LNG development, were of highest concern to
local residents. Short-term declines in seagrass cover have been
observed in a number of areas of the GBR since 2011, and these
are attributed to the interaction of multiple processes including
dredging, flooding and cyclones (Great Barrier Reef Marine Park
Authority, 2014; McKenna et al., 2015). The research also
included a component of ecological field- and laboratory-based
research that examined the interactions between elevated
event-based sedimentation rates and seagrasses in the Port of
Gladstone. Lastly, the research drew together these two
components through a critical assessement of the processes of
Environmental Impact Assessment (EIA) and Social Impact
Assessment (SIA) for the Gladstone LNG projects. These twin
processes are designed to predict and provide a framework for
managing the impacts of developments at the local scale.
The findings of this research relate both to the ecology of
seagrass meadows in the port of Gladstone and to the
socio-economic changes that are intimately linked to
environmental change. The research demonstrates that local
attitudes towards LNG development in the GBR are closely linked
to perceptions of environmental health before and after port
development, as well as the values that local residents associate
with the marine environment. The importance of coastal ecosystems
to local livelihoods, lifestyles and sense of place, and their
vulnerability to port-related disturbance emphasises the need to
protect them into the future. Seagrasses in the Port of Gladstone
demonstrate resistance to sedimentation, but growth declines
significantly when these species are shaded or buried for
prolonged periods, such as may occur after flood events or
dredging. Additionally, the research found that the coastal
setting and specific characteristics of the LNG industry –
including the speed and unprecedented scale of development –
have led to highly specific, and often cumulative, social and
economic impacts that are difficult to predict and manage through
current project-based impact assessment processes. Finally,
although it is widely acknowledged that both scientific and local
knowledges, including the knowledge of local indigenous peoples,
play an important role in governance processes, current
governance arrangements inhibit effective knowledge sharing and
adaptive governance throughout the project lifecycle. This thesis
provides evidence for the benefits of a more inclusive, adaptive
approach to impact assessment, and also highlights the ways in
which transdisciplinary research may be used to improve our
understanding of complex social-ecological systems.