Дисертації з теми "Phase accumulation"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-27 дисертацій для дослідження на тему "Phase accumulation".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Carceller, Jean-Luc. "Formation, accumulation, et caractérisation des polymères gluténiques du grain de blé tendre (Triticum aestivum L. )." Toulouse, INPT, 2000. http://www.theses.fr/2000INPT003C.
Повний текст джерелаTóth, Balázs. "Two-phase flow investigation in a cold-gas solid rocket motor model through the study of the slag accumulation process." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210575.
Повний текст джерелаThe first stage of spacecrafts (e.g. Ariane 5, Vega, Shuttle) generally consists of large solid propellant rocket motors (SRM), which often consist of segmented structure and incorporate a submerged nozzle. During the combustion, the regression of the solid propellant surrounding the nozzle integration part leads to the formation of a cavity around the nozzle lip. The propellant combustion generates liquefied alumina droplets coming from chemical reaction of the aluminum composing the propellant grain. The alumina droplets being carried away by the hot burnt gases are flowing towards the nozzle. Meanwhile the droplets may interact with the internal flow. As a consequence, some of the droplets are entrapped in the cavity forming an alumina puddle (slag) instead of being exhausted through the throat. This slag reduces the performances.
The aim of the present study is to characterize the slag accumulation process in a simplified model of the MPS P230 motor using primarily optical experimental techniques. Therefore, a 2D-like cold-gas model is designed, which represents the main geometrical features of the real motor (presence of an inhibitor, nozzle and cavity) and allows to approximate non-dimensional parameters of the internal two-phase flow (e.g. Stokes number, volume fraction). The model is attached to a wind-tunnel that provides quasi-axial flow (air) injection. A water spray device in the stagnation chamber realizes the models of the alumina droplets, which are accumulating in the aft-end cavity of the motor.
To be able to carry out experimental investigation, at first the the VKI Level Detection and Recording(LeDaR) and Particle Image Velocimetry (PIV) measurement techniques had to be adapted to the two-phase flow condition of the facility.
A parametric liquid accumulation assessment is performed experimentally using the LeDaR technique to identify the influence of various parameters on the liquid deposition rate. The obstacle tip to nozzle tip distance (OT2NT) is identified to be the most relevant, which indicates how much a droplet passing just at the inhibitor tip should deviate transversally to leave through the nozzle and not to be entrapped in the cavity.
As LeDaR gives no indication of the driving mechanisms, the flow field is analysed experimentally, which is supported by numerical simulations to understand the main driving forces of the accumulation process. A single-phase PIV measurement campaign provides detailed information about the statistical and instantaneous flow structures. The flow quantities are successfully compared to an equivalent 3D unsteady LES numerical model.
Two-phase flow CFD simulations suggest the importance of the droplet diameter on the accumulation rate. This observation is confirmed by two-phase flow PIV experiments as well. Accordingly, the droplet entrapment process is described by two mechanisms. The smaller droplets (representing a short characteristic time) appear to follow closely the air-phase. Thus, they may mix with the air-phase of the recirculation region downstream the inhibitor and can be carried into the cavity. On the other hand, the large droplets (representing a long characteristic time) are not able to follow the air-phase motion. Consequently, a large mean velocity difference is found between the droplets and the air-phase using the two-phase flow measurement data. Therefore, due to the inertia of the large droplets, they may fall into the cavity in function of the OT2NT and their velocity vector at the level of the inhibitor tip.
Finally, a third mechanism, dripping is identified as a contributor to the accumulation process. In the current quasi axial 2D-like set-up large drops are dripping from the inhibitor. In this configuration they are the main source of the accumulation process. Therefore, additional numerical simulations are performed to estimate the importance of dripping in more realistic configurations. The preliminary results suggest that dripping is not the main mechanism in the real slag accumulation process. However, it may still lead to a considerable contribution to the final amount of slag.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Mohamed, Fathimath. "Accumulation of trace elements in aquatic food chains due to sea-fill activities." Thesis, University of Canterbury. Department of Chemistry, 2015. http://hdl.handle.net/10092/11125.
Повний текст джерелаDjerrada, Abderrahmane. "Stockage thermique de l'energie solaire." Paris, ENSAM, 1988. http://www.theses.fr/1988ENAM0014.
Повний текст джерелаMayer, Didier. "Etude des proprietes thermophysiques de materiaux a transition solide-solide en vue d'applications au stockage de la chaleur." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0063.
Повний текст джерелаSklenářová, Lenka. "Možnosti aplikace systémů s akumulací tepla v jaderné energetice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230557.
Повний текст джерелаAchard, Patrick. "Etude et caractérisation de parois d'enveloppe de bâtiment intégrant un matériau à changement de phase et constituant une interface modulable permettant la captation de l'énergie solaire et la gestion des ambiances intérieures." ENMP, 1986. http://www.theses.fr/1986ENMP0016.
Повний текст джерелаFerreira, Ana Lúcia Morgado. "Isolation and characterization of PHAs-accumulating bacteria from HSSL." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/13401.
Повний текст джерелаPolyhydroxyalkanoates (PHAs) are biodegradable and biocompatible biopolymers. PHAs emerge as a possible solution as substitutes of petroleum based plastics, being produced under the Biorefinery concept, in which wastes and by-products of numerous industries may be used as carbon source. This project aimed the isolation and characterization of organisms able to store PHAs from Hardwood Sulphite Spent Liquor (HSSL), a by-product of the pulp and paper industry. Isolation was performed from a Mixed Microbial Culture (MMC) selected under feast and famine conditions, using some components present in HSSL as substrates, such as acetic acid and xylose. Five pure isolates able to produce PHAs resulted from the successive streaking in solid medium containing HSSL. The purity of the isolates was evaluated through Gram staining and FISH analysis and the PHAs accumulation by Nile Blue staining. Two strains were identified as Rhohococcus spp. and three as Pseudomonas spp.. One isolate of each genus was selected and further studied in terms of growth and PHAs accumulation capability from three distinct carbon sources (HSSL, acetic acid and xylose). Both isolates, Rhodococcus spp. and Pseudomonas spp., were able to grow and use the three carbon sources as well as to produce PHAs. However, both strains showed a higher maximum specific growth rate (μmax) when HSSL was used as carbon source, 0.212 ± 0.0219 h-1 and 0.251 ± 0.0526 h-1, respectively. A qualitative evaluation of the PHAs accumulation through Nile Blue staining exhibited a higher accumulation when acetic acid was used as sole carbon source. In an attempt to identify some of the species responsible for PHAs accumulation of the selected MMC, belonging to the dominant class, Alphaproteobacteria, a 16S rDNA clone library was constructed. It was possible to identity Novosphingobium spp., Sphingobium spp. and Pleomorphomonas spp.
Polihidroxialcanoatos (PHAs) são biopolímeros biodegradáveis e biocompatíveis. Os PHAs são considerados uma solução possível como substitutos dos plásticos derivados do petróleo, podendo ser produzidos no âmbito do conceito de Biorefinaria utilizando resíduos como fonte de carbono. Este trabalho teve como objectivo o isolamento e a caracterização de bactérias produtoras de PHAs a partir de licor de cozimento ao sulfito ácido (HSSL), um sub-produto da indústria papeleira. Os isolamentos foram realizados partindo de uma cultura mista seleccionada para a acumulação de PHAs por imposição de ciclos de fome e fartura, utilizando alguns dos componentes do HSSL como substrato, nomeadamente a xilose e o ácido acético. Após repicagens sucessivas em meio sólido contendo HSSL, foi possível obter cinco isolados puros capazes de acumular PHAs. A pureza dos isolados foi avaliada através de coloração de Gram e análise FISH e a capacidade de acumulação de PHAs por coloração de Azul do Nilo. Duas estirpes foram identificadas como Rhohococcus spp. e três como Pseudomonas spp.. Um isolado de cada género foi seleccionado e estudado em termos de crescimento e capacidade de acumulação de PHAs, a partir de três fontes de carbono distintas (HSSL, ácido acético e xilose). Verificou-se que ambos os isolados, Rhodococcus spp. e Pseudomonas spp., foram capzes de crescer nos três meios e produziram PHAs. Contudo, ambas as estirpe apresentaram uma taxa específica de crescimento (μmax) superior com HSSL como fonte de carbono, 0.212 ± 0.0219h-1 e 0.251 ± 0.0526h-1 respectivamente. Uma avaliação qualitativa da acumulação de PHAs utilizando coloração Azul do Nilo mostrou uma acumulação maior nos ensaios em que o ácido acético era a única fonte de carbono. Numa tentativa de identificar algumas das espécies responsáveis pela acumulação de PHAs da cultura mista seleccionada pertencentes à classe dominante, Alfaproteobactéria, recorreu-se à construção de uma biblioteca de clones 16S rDNA. Foram identificadas as espécies Novosphingobium spp., Sphingobium spp e Pleomorphomonas spp.
Jang, Ha Won. "Phases of capital accumulation in Korea and evolution of government growth strategy, 1963-1990." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307330.
Повний текст джерелаGutjahr, Sylvain. "Analyse des caractères d’intérêt morphogénétiques et biochimiques pour le développement des sorghos sucrés à double usage « grain-bioalcool »." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20061/document.
Повний текст джерелаSweet sorghum offers many advantages as an alternative to widely cultivated crops such as corn and sugarcane to produce biofuels: it is resistant to water stress, it requires few inputs; it has a shorter growth cycle compared to sugarcane in particular. Sorghum also exhibits a great genetic diversity and is genetically less complex than sugarcane. Finally, sorghum can be cultivated for dual‐purpose uses, using grains for food or feed and sweet juice for biofuel production. Hence, sorghum is a promising option to reduce the competition for land and (water) resource use between food and fuel, in particular in cropping environments with high drought and heat stress frequency, as in West Africa. However, stem sweetness is a complex trait prone to genotype x environment interactions (GxE). The metabolic, morphological and phenological mechanisms involved in the kinetic of stem sugar accumulation and its possible competition with grain filling are largely unknown or controversial in the literature. The present work is part of the European project Sweetfuel and aims at better understanding these mechanisms and contributing to define dual‐purpose sorghum ideotypes for soudano‐sahelian conditions.Based on field and greenhouse experiments respectively in Mali and France, it was found that sugars start accumulating in stem internodes at the onset of their elongation, i.e. potentially soon before the plant flowers. The successive accumulation of hexose and then sucrose in internodes could be dynamically explained by changes in the activity of key enzymes related to sucrose metabolism. In Mali, a field experiment performed on 14 genotypes, contrasted for photoperiod sensitivity and sown at three planting dates, highlighted the interest of increasing vegetative phase duration to increase sugar yield. This was explained first of all by the higher number of internodes that could expand during a longer vegetative phase, and thus, by the higher production of stem biomass, and, to a minor extent, by the longer time for internodes to mature and accumulate sugar (sugar concentration in the stem was however fairly stable across sowing dates). Also, vegetative phase duration and photoperiod sensitivity can be considered as two key parameters promoting stem sugar content before grain filling. In the same time, it was shown that stem sugar content kept remarkably constant between anthesis and maturity in most of studied genotypes and that the reduction observed for some genotypes was overcome with an early sowing. Moreover, sugar accumulation in the stem between flowering and maturity did not benefit from panicle pruning. These results together suggest that the competition for carbohydrates between stem sugar reserves and grain filling is weak; it is even weaker for big/large stem genotypes with huge sugar reserves in the stem that would buffer a post‐flowering allocation of sugar from the stem to the grains if required. This low competition was confirmed at a finer scale, as no differences were observed in the activity of key enzymes of sucrose metabolism between the sterile and the fertile line of a same genotype.This work demonstrates the potential of sorghum for dual‐purpose in particular for soudano‐sahelian cropping conditions and the interest of using its genetic diversity for this breeding purpose. It provides further knowledge for revisiting the phenotyping strategies to be adopted to investigate the genetic basis of sugar and grain production and their combination. The results are also currently used to improve the way the source‐sink relationships underlying this dual production are formalized in crop and plant models at CIRAD. Such models will be then useful to assist sorghum ideotype exploration for dual purpose
De, Villiers Louise Adriana. "Monitoring accumulative fatigue and recovery status in elite field hockey players during different phases of a competitive season." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96082.
Повний текст джерелаENGLISH ABSTRACT: There is a lack of research in the sport of field hockey, specifically where monitoring of fatigue and recovery is concerned. The primary aim of the study was thus to monitor the accumulative fatigue and recovery state of elite field hockey players during the different phases of a competitive season. The specific objectives of the study were to determine the changes in heart rate recovery of elite hockey players; to determine the changes in perceptual fatigue; to determine the relationship between players’ perceptions of recovery and stress; and to determine the relationship between the objective and subjective measures of recovery and fatigue over different phases during a competitive season. Elite female hockey players (n = 15) from Stellenbosch University were monitored over 23 weeks. This group comprised of players from the first team (Maties) and second team (VICS) of the club. The following tests were administered: the Heart rate Interval Monitoring System (HIMS) test with the use of SUUNTO heart rate monitors and SUUNTO Team Manager, the Perceptual Fatigue questionnaire (on a weekly basis), and the Recovery-Stress Questionnaire for Athletes (RESTQ-Sport 76) (during each phase of their normal competition cycle). There were a number of significant findings (p<0.05) relating to the aim and objectives of the study. One of the main findings was that there were significant differences between the phases with regard to the measured variables. Players experienced significantly more Fatigue, Lack of Energy and Pressure during the first Competition phase. With regard to the HIMS, players performed the best during the second Competition phase, following the university holidays. Even though not all the differences were statistically significant, collectively the results indicate that these monitoring tools can be used for teams. An added advantage with all three monitoring tools is that each person can be used as their own baseline. In a team setting it gives the coach and support team the opportunity to individualise training programmes and recovery methods.
AFRIKAANSE OPSOMMING: Daar is ‘n tekort aan navorsing in hokkie, en spesifiek in die monitering van vermoeienis en herstel by spelers. Die hoofdoel van die studie was dus om akkumulerende vermoeienis en die hersteltoestand van elite hokkiespelers gedurende verskillende fases van die kompetisie seisoen te monitor. Die spesifieke doelwitte van die studie was om die verandering in hartspoed herstel van die hoë vlak spelers te bepaal; om veranderinge in perseptuele vermoeienis te bepaal; om die verwantskap tussen die spelers se persepsies van herstel en stress te bepaal; om die verwantskap tussen die objektiewe en subjektiewe van herstel en vermoeienis oor die verskillende fases tydens die kompetisie seisoen te bepaal. Elite vroue hokkie spelers (n = 15) van Stellenbosch was oor 23 weke gemonitor. Hierdie groep het uit spelers van die eerste span (Maties) en die tweede span (VICS) van die klub bestaan. Die volgende toetse was uitgevoer: Die Hartspoed Interval Monitering Sisteem (HIMS) toets met behulp van die SUUNTO hartspoed monitors en die SUUNTO span administrasie sisteem; en die Perseptuele Vermoeienis vraelys was op ‘n weeklikse basis voltooi, terwyl die Herstel Stres vraelys vir Sportmense (RESTQ-Sport 76) gedurende elke fase van hul oefensiklus voltooi is. Daar was ‘n aantal betekenisvolle bevindings (p<0.05) wat verband hou met die doel en doelwitte van die studie. Een van die hoof bevindings was dat daar betekenisvolle verskille tussen die fases was met betrekking tot die veranderlikes. Spelers het beduidend meer Vermoeienis, Gebrek aan Energie en Druk gedurende die eerste Kompetisie fase ervaar. Met betrekking tot die HIMS het spelers die beste presteer gedurende die tweede Kompetisie fase, na afloop van ‘n rus periode gedurende die universiteitsvakansie. Hoewel al die verskille nie statisties beduidend was nie, is daar aangedui dat die moniterings instrumente geskik is vir gebruik by spanne. ‘n Verdere voordeel by al drie moniterings instrumente is dat elke persoon as sy eie basislyn kan dien. In ‘n spanopset bied dit aan die afrigter en ondersteuningspan die geleentheid om oefening en herstelmetodes te individualiseer.
Duval, Manuel. "La semence et la biotine : découverte d'une protéine à biotine chez Pisum sativum L., marqueur moléculaire de la maturation des semences et des phases précoces de la germination." Grenoble 1, 1995. http://www.theses.fr/1995GRE10133.
Повний текст джерелаUtada, Satoshi. "Effect of a Prior Plastic Deformation during Heat Treatments on the Mechanical Properties of Ni-Based Superalloys for Turbine Blade Application Evolution of superalloy for turbine airfoil and development of recycling technology Platinum containing new generation nickel-based superalloy for single crystalline application Tensile, low cycle fatigue and very high cycle fatigue characterizations of advanced single crystal nickel-based superalloys Creep Property and Phase Stability of Sulfur-Doped Ni-Base Single-Crystal Superalloys and Effectiveness of CaO Desulfurization Evaluation and comparison of damage accumulation mechanisms during non-isothermal creep of cast Ni-based superalloys." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0019.
Повний текст джерелаNi-based single crystal (SX) superalloys are used for turbine blade applications because of their high-temperature durability. During the production of a turbine blade, unexpected plastic deformation (PD) can be introduced to the material. In this study, SX materials were pre-deformed in between solution and aging heat treatments to mimic PD during production. Mechanical tests on the pre-deformed materials have been performed to understand the effect of the prior PD.During aging treatments of pre-deformed AM1 SX superalloy, faster coarsening of γ′ precipitates and enhanced void nucleation were observed in the vicinity of slip bands which were introduced by PD at room-temperature. During creep deformation of pre-deformed AM1 at high temperature/low stress conditions (≥ 950 °C), the microstructure coarsened bands act as diffusion induced creep damage accumulating paths, further triggering recrystallization and resulting in drastic reduction of creep properties. At low temperature/high stress conditions (≤ 850 °C), microstructure shearing was facilitated in the microstructure coarsened band and it decreased creep properties. Recrystallization was not observed at lower temperature creep because the diffusion damage was suppressed. These relationships have been explained by creep tests on pre-deformed materials prepared by different pre-deformation temperatures and heat treatment procedures.CMSX-4 Plus SX superalloy was tested similarly to AM1 to understand the effect of the chemical composition. Effect of pre-deformation on alloy’s microstructure was mild in CMSX-4 Plus compared to that in AM1. Therefore, the predeformation did no exhibit large creep life debit in CMSX-4 Plus at temperatures lower than 1050 °C. However, during creep of CMSX-4 Plus at 1150 °C, pre-deformation presented huge impact on creep life and ductility by the same mechanisms as the ones observed for AM1 at 1050 °C.In order to restore properties of pre-deformed SX superalloys, rejuvenation heat treatment was added after PD.Rejuvenation treatment successfully restored microstructure after PD at room-temperature, and creep properties of rejuvenated specimens were shown to be equivalent to that of original AM1 and CMSX-4 Plus without PD
Kratochvíl, Petr. "Generátor přesného kmitočtu - DDS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217814.
Повний текст джерелаShakya, Mahendra Man. "Generation of intense high harmonics : i) to test and improve resolution of accumulative x-ray streak camera ii) to study the effects of carrier envelope phase on XUV super continuum generation by polarization gating." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/408.
Повний текст джерелаMáca, Tomáš. "Modifikace hydroxidu nikelnatého pro zlepšení jeho elektrochemických vlastností v alkalických akumulátorech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-233682.
Повний текст джерелаRatnayake, Mudiyanselage Kalpani Manurangi. "A MULTI-PROXY APPROACH TO RECONSTRUCTION OF HOLOCENE CLIMATE CHANGE: EVIDENCE FROM LAKE ERIE SEDIMENTARY ARCHIVES." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1606763358671089.
Повний текст джерелаSloan, Andrew. "The Role of Non-Ferritic Phase in the Micro-Void Damage Accumulation and Failure of Dual-Phase Steels." Thesis, 2011. http://hdl.handle.net/1974/6804.
Повний текст джерелаThesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2011-09-30 11:49:18.645
Wei-FangChang and 張瑋芳. "Using Phase Accumulation Demodulation and Maximum Likelihood Estimation to Improve the Accuracy of Vital Signs and Range Detection in Cluttered Environments for FMCW Radar Systems." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7z5822.
Повний текст джерела國立成功大學
電機工程學系
106
This paper presents a noise tolerable method for FMCW radar systems to detect vital sign under strong reflected interference signals of stationary clutter. By using phase accumulated demodulation, vital sign detection can be demodulated clearly even under existence of strong clutters influence, and noise can be decreased so that the delay-line can be reduced for the compact system implementation. Moreover, the maximum likelihood estimation used to decrease the influence of the clutter. From the measurement results, the measured absolute range has 4.69% error from 0.5 m to 3.05 m in average. Moreover, the vital sign is 2.25% and 1.49% error with stationary clutter interferer 0.75 m and 1.3 m behind the human target.
Carr, John. "A 26 GHz Phase-Locked Loop Frequency Multiplier in 0.18-um CMOS." Thesis, 2009. http://hdl.handle.net/1974/1796.
Повний текст джерелаThesis (Ph.D, Electrical & Computer Engineering) -- Queen's University, 2009-04-24 11:31:35.384
WU, CHANG-LIN, and 吳昌霖. "Precise Radar Positioning with Phase Segmentation Accumulating Algorithm Designed for Minimally Invasive Surgery." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/p5bvfd.
Повний текст джерела國立中正大學
電機工程研究所
105
The radar-based positioning technology designed for the minimally invasive surgical instrument guiding is presented in this thesis. It is designed using the frequency modulation continuous wave radar system with a newly proposed algorithm to achieve the mm-scale positioning accuracy. According to the traditional FMCW radar theory, the range resoulation is limited by frequency sweeping bandwidth. This study focuses on a new theory of phase segmentation accumulation to overcome this issue. In order to achieve multi-target positioning, the binary phase shift keying (BPSK) is applied in tag modulation. Further mahthematical analysis of BPSK is also given in this work. The proposed radar system consists of a commercial 24 GHz programmable millimeter wave transceiver module and a frequency modulation PLL module, An extrenalit power amplifier is added to increase the signal power as well as the detecting range. The signal acquisition and signal processing is performed using NI – LabVIEW. In the experimental demonstrations, both metal plane and BPSK tag are employed as the targets. The results show that the range resoulation can be dramatically improved from 18.75 cm (limited by to 400MHz sweeping bandwidth) to 17.3 μm.
Wu, Yu-Sheng, and 吳育昇. "Application of Shift-Down Phenomenon in PHAs Accumulation Bacteria Screening and Fermentation Production." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/59855681936854495124.
Повний текст джерела高苑科技大學
化工與生化工程研究所
100
Polyhydroxyalkanoates (PHAs), one of the biodegradable biosynthetic polymers were function as carbon and energy reservoirs in numerous bacteria. They were known to accumulate inside the bacteria usually when carbon source is excess and one else essential growth nutrient is limited. Shift-down, a temporary unbalanced bacteria culture method established by simple dilution culture procedure can equivalently induce the PHAs accumulation. A temporary unbalanced bacteria growth phenomenon established by shift-down culture procedure was applied to screening PHAs accumulating environment bacteria isolates. The culture method was applied to test PHAs accumulating in standard and environment bacteria isolates. Despite the typical limiting nutrient or C/N ratio, PHAs accumulation seems to be common in bacteria applied of the culture method. This result shown that the shift-down culture method is simple and broad spectrum in screening environment bacteria to find new industry available PHAs produced candidates. The products were characterized as PHB in recovery of Pseudomonas sp. and Bacillus sp.0.03 g/L and 0.07g/L respectively.
Chen, Yen-Yu, and 陳嬿伃. "Distribution and Accumulation of Arsenic among Solid, Aqueous, and Plant Phases in the Guandu Wetland of Taiwan." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48033836651352054347.
Повний текст джерела國立臺灣大學
生物環境系統工程學研究所
100
The purpose of this study was to determine the distribution and accumulation of arsenic (As) among aqueous, solid, and plant phases in the Guandu Wetland of Taiwan. Chemical compounds and isotopic compositions in porewater samples of dry season and mineral compositions in the sediment samples of wet season were analyzed to characterize the As distribution with depth. Arsenic concentrations in plant samples were analyzed to assess the translocation factor (TF) and bioconcentration factor (BCF), and to understand the distribution and accumulation of As in the plant, solid, and liquid phases. Chemical compounds concentration were applied the factor and cluster analyses in porewater samples to delineate the vertical profile of oxidation zone (shallow layer), buffer zone (mid layer), and reduction zone (deep layer); and to elucidate the mechanism of As possible mobile in each zone. As-bearing minerals were not found in all sediment samples by using X-ray diffraction (XRD). However, the result of As species transformation indicated mild As(V) (arsenate) shifting to As(III) (arsenite) in the deep layer by X-ray absorption near-edge structure (XANES) of X-ray absorption spectra (XAS). The results implicate that reduction gradient was tended to increase with depth in this wetland systems. The cluster analysis was applied to determine the boundary of shallow zone and deep zone using isotopic compositions data of the sediment samples. The high values of sulfur isotope fractionation factor (ε) occurred in deep zone which was caused by the bacterial sulfate reduction. The results of sulfur isotope indicate that the source of water in shallow zone and deep zone are mainly from mixing of the seawater/surface water and Batou groundwater, respectively. Kandelia obovata is one of the most dominant plant species in mangrove ecosystems of the study area. In this study, As concentrations in plants (23.69 mg/kg) were higher than in the surrounding water (0.0018 mg/L) and soils (17.24 mg/kg). The order of arsenic concentration in various plant tissues at maturity was as follows: roots (19.74 mg/kg) > stems (1.76 mg/kg) > leaves (1.71 mg/kg) > seedlings (0.48 mg/kg), suggesting a high accumulation in the roots. The low translocation factors (TFstems/roots= 0.088, TFleaves/roots= 0.088 and TFseedlings/roots= 0.024) indicate that the translocation of As in various plant tissues is extremely low depending on salt tolerance mechanism of K. obovata. The significant tidal effects result in high BCFplant/water that the As concentrations in wetland water is diluted by seawater. A high BCFplant/soil (BCFplant/soil> 1) between plants and soil indicates that the uptake and bioaccumulation of As in K. obovata are significant; therefore, K. obovata is an As accumulator. The uptake mechanism of plants might depend on the formation of As-contained iron oxides in the root zone, causing the uptake of As in plants to be from soil.
Preuten, Tobias [Verfasser]. "Organellar gene expression : regulation of phage-type RNA polymerase transcript accumulation and analyses of mitochondrial gene copy numbers in Arabidopsis / von Tobias Preuten." 2009. http://d-nb.info/1007739207/34.
Повний текст джерелаVeale, Gerhardus Ignatius Potgieter. "Low phase noise 2 GHz Fractional-N CMOS synthesizer IC." Diss., 2010. http://hdl.handle.net/2263/27921.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2010.
Electrical, Electronic and Computer Engineering
unrestricted
Pereira, Carla Domiciana Ferreira Álvares. "Caracterização de fenologia das 5 cultivares de oliveiras tradicionais portuguesa." Master's thesis, 2017. http://hdl.handle.net/10400.26/20666.
Повний текст джерелаThe goal of this study was to monitor and observe the phenological phases of five cultivars of traditional Portuguese olive trees: Azeiteira, Blanqueta, Carrasquenha of Elvas, Cobrançosa and Galega vulgar, in olive groves located in Elvas, Campo Maior and Monforte. The study was conducted in the agricultural year of 2016/2017 and was based on 7 olive groves, each olive grove with 5 observation points, 4 trees per observation point resulting in 20 trees varieties/olive grove. The flowering period started on april, 22nd, for the Azeiteira cultivar (Monforte) and lasted 21 days, whereas the last cultivar to start flowering was Carrasquenha of Elvas, on May 5th, with a duration of 15 days. Multivariate analysis of the cultivars was performed during the period of accumulation of temperatures/thermal duration. This period initiated on January, 1st, and lasted until the first observation of state 75 of the BBCH scale. Results show 2 significantly different groups. Group 1, constituted by the Cobrançosa cultivar, in Elvas and Monforte, and the cultivar Carrasquenha in Campo Maior, showed plants with greater accumulation needs of growth degree-days demonstrating to have a later cycle. Group 2, formed by cultivars Azeiteira (Campo Maior and Monforte), also Blanqueta and Galega vulgar, presented plants with a higher precocity which had lower accumulation needs of growth degree-days. The persistent fruit rate scale, ranging from 1 to 6, was highest for both Cobrançosa (Elvas) and Galega (Monforte) cultivars, with a value of 5,7 and lowest for Carrasquenha (Campo Maior), with a value of only 4,0. Results show heterogeneity among the cultivars studied, which is very important to cope with climate changes. However, further investigation is necessary in order to confirm these findings and deepen our understandings of each individual behaviour.
Werz, Emma. "Darstellung und Verwendung von Nucleolipiden zur Lipophilisierung von Nucleinsäuren sowie deren Wechselwirkung und Duplex-Bildung an horizontalen Lipid-Bilayers und Phasengrenzen zur Entwicklung einer neuartigen RNA/DNA-Analytik." Doctoral thesis, 2016. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2016021714241.
Повний текст джерела