Log in

Relevant bibliographies by topics / Annual variability / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Annual variability.

Dissertations / Theses on the topic 'Annual variability'

Author: Grafiati

Published: 25 May 2024

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Annual variability.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Wallace, Craig. "Variability in the annual cycle of temperature and the atmospheric circulation." Thesis, University of East Anglia, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399842.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gutzler, David Scott. "The structure of annual and interannual wind variability in the tropics." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/54309.

Full text

Abstract:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.<br>Microfiche copy available in Archives and Science<br>Bibliography: leaves 218-224.<br>by David Scott Gutzler.<br>Ph.D.

APA, Harvard, Vancouver, ISO, and other styles

3

Ding, Hui [Verfasser]. "Annual to interannual equatorial Atlantic variability : mechanisms and tropical impacts / Hui Ding." Kiel : Universitätsbibliothek Kiel, 2010. http://d-nb.info/1020003529/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Hytteborn, Julia. "Water Quality in Swedish Lakes and Watercourses : Modeling the Intra-Annual Variability." Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234480.

Full text

Abstract:

Water quality is of great importance for ecosystems and society. This thesis characterized and modeled the variation in several key constituents of Swedish surface waters, with particular consideration given to intra-annual variability and sensitivity to climate change. Cyanobacterial data from 29 lakes and basins as well as total organic carbon (TOC) from 215 watercourses were used. Extensive data on catchment characteristics, morphometry, discharge, temperature and other water chemistry data were also analyzed. Models characterizing the seasonality in cyanobacterial concentration and relativ

APA, Harvard, Vancouver, ISO, and other styles

5

Filipe, Vianda Lulendo Luankosi. "Seasonal and inter-annual variability of SST and chlorophyll-a off Angola." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/6472.

Full text

Abstract:

Includes bibliographical references (p. 105-112).<br>The aim of this dissertation is to use satellite-derived images for the study of spatial and temporal variations in SST and in concentration of surface chlorophyll-a of the main oceanographic features off Angola. SST time-series over the 1987 to 2002 were derived from Meteosat 5-day SST composites with a spatial resolution of about 5-6 km in Angolan waters and a thermal resolution of 0.5°C. Chlorophyll-a data were from a 5-day composite of SeaWiFS GAC (4.5 km 'Global Area Coverage') images. Such images were available on a format comparable w

APA, Harvard, Vancouver, ISO, and other styles

6

Mount, Christopher P. "Spatial, temporal, and inter-annual variability of the Martian northern seasonal polar cap." Thesis, Northern Arizona University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1537795.

Full text

Abstract:

<p>Earth and Mars have nearly the same axial tilt, so seasons on these two bodies progress in a similar manner. During fall and winter on Mars, the primarily CO<sub>2</sub> atmosphere (~95% by volume) condenses out onto the poles as ice. Approximately 25% of the entire Martian atmosphere condenses, and then sublimes in the spring, making this cycle a dominant driver in the global climate. Because the water and dust cycles are coupled to this CO<sub>2</sub> cycle, we must examine seasonal CO<sub>2</sub> processes to understand the global (seasonal) distribution of H<sub>2</sub>O on Mars. The de

APA, Harvard, Vancouver, ISO, and other styles

7

Marston, Michael Lee. "Analysis of Extreme Reversals in Seasonal and Annual Precipitation Anomalies Across the United States, 1895-2014." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71697.

Full text

Abstract:

As population and urbanization increase across the United States, the effects of natural hazards may well increase, as extreme events would increasingly affect concentrated populations and the infrastructure upon which they rely. Extreme precipitation is one natural hazard that could stress concentrated populations, and climate change research is engaging heavy precipitation frequency and its impacts. This research focuses on the less-studied phenomenon of an extreme precipitation reversal - defined as an unusually wet (dry) period that is preceded by an unusually dry (wet) period. The magnitu

APA, Harvard, Vancouver, ISO, and other styles

8

Kohn, Deborah Diane. "Effects of genetic variability and founder number in small populations of an annual plant." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286448.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Bathke, Deborah J. "Meteorological processes controlling the variability of net annual accumulation over the Greenland ice sheet." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1073073721.

Full text

Abstract:

Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xv, 200 p.; also includes graphics. Includes bibliographical references (p. 173-184).

APA, Harvard, Vancouver, ISO, and other styles

10

Maldonado, Tito. "Inter-annual variability of rainfall in Central America : Connection with global and regional climate modulators." Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304656.

Full text

Abstract:

Central America is a region regularly affected by natural disasters, with most of them having a hydro-meteorological origin. Therefore, the understanding of annual changes of precipitation upon the region is relevant for planning and mitigation of natural disasters. This thesis focuses on studying the precipitation variability at annual scales in Central America within the framework of the Swedish Centre for Natural Disaster Science. The aims of this thesis are: i) to establish the main climate variability sources during the boreal winter, spring and summer by using different statistical techn

APA, Harvard, Vancouver, ISO, and other styles

11

Gonçalves, Renata Isabel de Sousa. "Growth variability of Greenlandic cod (Gadus morhua L.) estimated by means of otolith annual increments." Master's thesis, Instituto de Ciências Biomédicas Abel Salazar, 2008. http://hdl.handle.net/10216/9326.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Oozeeraully, Yuneeda Bibi Naheed. "The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15686.

Full text

Abstract:

Chlorophyll-a concentration is a measure of phytoplankton biomass and is therefore used as a proxy for primary production. The chlorophyll bloom occurring in the South western Indian Ocean is one of the major blooms in the open ocean and is subject to controversies about its formation, propagation and termination mechanisms. In this study, the region was divided into two sub-regions, the South East region (48°E-66°E, 24°S-30°S) and the East region (70°E-88°E, 24°S-30°S) and satellite datasets of chlorophyll-a, sea surface temperature, wind speed and direction and sea surface height were analys

APA, Harvard, Vancouver, ISO, and other styles

13

Switanek, Matthew. "Improving Seasonal to Annual Predictions of Climate Variability and Water Availability at the Catchment Scale." Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/193313.

Full text

Abstract:

In a water-stressed region, such as the southwestern United States, it is essential to improve current seasonal hydroclimatic predictions. Typically, seasonal hydroclimatic predictions have been conditioned by standard climate indices, e.g., NINO3 and PDO. In this work, a methodology called basin-specific climate prediction (BSCP) is proposed to improve hydroclimatic predictions. The method analyzes the statistically unique relationships between sea surface temperatures (SSTs) and a basin's hydroclimate. The oceanic region which maximizes the correlation is subsequently used as a predictor for

APA, Harvard, Vancouver, ISO, and other styles

14

Gonçalves, Renata Isabel de Sousa. "Growth variability of Greenlandic cod (Gadus morhua L.) estimated by means of otolith annual increments." Dissertação, Instituto de Ciências Biomédicas Abel Salazar, 2008. http://hdl.handle.net/10216/9326.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

White, Kellie L. "Annual and intra-annual shell growth lines of the freshwater bivalve Pyganodon grandis, an evaluation of their utility for the analysis of past environmental variability." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30853.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Köchy, Martin. "Opposite trends in life stages of annual plants caused by daily rainfall variability : interaction with climate change." Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2007/1469/.

Full text

Abstract:

Global Circulation Models of climate predict not only a change of annual precipitation amounts but also a shift in the daily distribution. To improve the understanding of the importance of daily rain pattern for annual plant communities, which represent a large portion of semi-natural vegetation in the Middle East, I used a detailed, spatially explicit model. The model explicitly considers water storage in the soil and has been parameterized and validated with data collected in field experiments in Israel and data from the literature. I manipulated daily rainfall variability by increasing the

APA, Harvard, Vancouver, ISO, and other styles

17

Marble, Douglas Craig. "Simulated annual and seasonal Arctic Ocean and sea-ice variability from a high resolution, coupled ice-ocean model." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA397317.

Full text

Abstract:

Dissertation (Ph.D. in Physical Oceanography) Naval Postgraduate School, Sept. 2001.<br>Dissertation supervisors: Maslowski, Wieslaw ; Semtner, Albert J. "September 2001." Includes bibliographical references (p. 163-177). Also available online.

APA, Harvard, Vancouver, ISO, and other styles

18

Davies, Sarah B. "Vegetation Dynamics of a Tidal Freshwater Marsh: Long-Term and Inter-Annual Variability and their Relationship to Salinity." W&M ScholarWorks, 2004. https://scholarworks.wm.edu/etd/1539617817.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Chiarini, Francesca <1983&gt. "Study of the inter-annual variability of particle vertical fluxes in two moorings in the Ross Sea (Antarctica)." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5469/1/chiarini_francesca_tesi.pdf.

Full text

Abstract:

The most ocean - atmosphere exchanges take place in polar environments due to the low temperatures which favor the absorption processes of atmospheric gases, in particular CO2. For this reason, the alterations of biogeochemical cycles in these areas can have a strong impact on the global climate. With the aim of contributing to the definition of the mechanisms regulating the biogeochemical fluxes we have analyzed the particles collected in the Ross Sea in different years (ROSSMIZE, BIOSESO 1 and 2, ROAVERRS and ABIOCLEAR projects) in two sites (mooring A and B). So it has been developed a mo

APA, Harvard, Vancouver, ISO, and other styles

20

Chiarini, Francesca <1983&gt. "Study of the inter-annual variability of particle vertical fluxes in two moorings in the Ross Sea (Antarctica)." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5469/.

Full text

Abstract:

The most ocean - atmosphere exchanges take place in polar environments due to the low temperatures which favor the absorption processes of atmospheric gases, in particular CO2. For this reason, the alterations of biogeochemical cycles in these areas can have a strong impact on the global climate. With the aim of contributing to the definition of the mechanisms regulating the biogeochemical fluxes we have analyzed the particles collected in the Ross Sea in different years (ROSSMIZE, BIOSESO 1 and 2, ROAVERRS and ABIOCLEAR projects) in two sites (mooring A and B). So it has been developed a mo

APA, Harvard, Vancouver, ISO, and other styles

21

Alimohammadi, Negin. "Modeling Annual Water Balance in The Seasonal Budyko Framework." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5099.

Full text

Abstract:

In this thesis, the role of soil water storage change on the annual water balance is evaluated based on observations at a large number of watersheds located in a spectrum of climate regions, and an annual water balance model is developed at the seasonal scale based on Budyko hypthesis. The annual water storage change is quantified based on water balance closure given the available data of precipitation, runoff, and evaporation estimated from remote sensing data and meteorology reanalysis. The responses of annual runoff, evaporation, and storage change to the interannual variability of precip

APA, Harvard, Vancouver, ISO, and other styles

22

Regonda, Satish Kumar. "Intra-annual to inter-decadal variability in the upper Colorado hydroclimatology: Diagnosis, forecasting and implications for water resources management." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3239392.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Greene, Nicola. "Intra-annual variability in standards of water and sanitation in Upper Humla, Nepal : an investigation into the causes, importance and impact." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16183.

Full text

Abstract:

This study investigates the impact of seasonality on standards of water and sanitation in the mountainous district of Humla, Nepal. The research considers impact on two levels: community level access and service delivery. First of all, it examines annual variation in village level access to water and sanitation. Secondly, it looks at the wider picture of service delivery and considers how seasonal variations present opportunities and challenges for improvement in standards for water and sanitation. Three case studies from Humla are presented which illustrate village level access to water and s

APA, Harvard, Vancouver, ISO, and other styles

24

Reins, Nina J. "Long Term Bathymetry Changes in the Lower Mississippi River due to Variability in Hydrograph and Variable Diversion Schemes." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2490.

Full text

Abstract:

This research is part of an ongoing effort to improve predictions for bathymetric and morphological changes in the Lower Mississippi River. The utilized model is a subset of a previously calibrated Delft3D model. This shorter model has reduced computational time, and can be deployed for analysis focused on the area between Belle Chasse and HOP, which is the domain of the model. Simulation runs conducted under this study vary from 12 years to 48 years, utilizing a developed 12-year variable hydrograph. The comparison of variable annual hydrograph and repeated representative annual (uniform) hyd

APA, Harvard, Vancouver, ISO, and other styles

25

Hauck, Judith [Verfasser], Dieter [Akademischer Betreuer] Wolf-Gladrow, and Birgit [Akademischer Betreuer] Schneider. "Processes in the Southern Ocean carbon cycle: Dissolution of carbonate sediments and inter-annual variability of carbon fluxes / Judith Hauck. Gutachter: Dieter Wolf-Gladrow ; Birgit Schneider. Betreuer: Dieter Wolf-Gladrow." Bremen : Staats- und Universitätsbibliothek Bremen, 2012. http://d-nb.info/1071993844/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Saunders, Ryan Alexander. "Ecological investigations of euphausiids at high latitudes." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/347.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Torp, Mikaela. "The effect of snow on plants and their interactions with herbivores." Doctoral thesis, Umeå : Department of Ecology and Environmental Science, Umeå University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-30444.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Reboita, Michelle Simões. "Elementos da variabilidade climática no extremo sul do Brasil, no Período de 1990 a 2001." reponame:Repositório Institucional da FURG, 2004. http://repositorio.furg.br/handle/1/3488.

Full text

Abstract:

Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós-Graduação em Engenharia Oceânica, Escola de Engenharia, 2004.<br>Submitted by Lilian M. Silva (lilianmadeirasilva@hotmail.com) on 2013-04-19T22:49:03Z No. of bitstreams: 1 Elementos da Variabilidade Climática no Extremo Sul do Brasil, no Período de 1990 a 2001..pdf: 17940864 bytes, checksum: 36cb3aef5938e868c38a69767e658fa2 (MD5)<br>Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2013-06-10T18:09:00Z (GMT) No. of bitstreams: 1 Elementos da Variabilidade Climática no Extremo Sul do Brasi

APA, Harvard, Vancouver, ISO, and other styles

29

Marzin, Anahita. "Indicateurs biologiques de la qualité écologique des cours d’eau : variabilités et incertitudes associées." Thesis, Paris, AgroParisTech, 2013. http://www.theses.fr/2013AGPT0002/document.

Full text

Abstract:

Evaluer, maintenir et restaurer les conditions écologiques des rivières nécessitent des mesures du fonctionnement de leurs écosystèmes. De par leur complexité, notre compréhension de ces systèmes est imparfaite. La prise en compte des incertitudes et variabilités liées à leur évaluation est donc indispensable à la prise de décision des gestionnaires. En analysant des données nationales (~ 1654 sites), les objectifs principaux de cette thèse étaient de (1) tester certaines hypothèses intrinsèques aux bio-indicateurs et (2) d'étudier les incertitudes de l'évaluation écologique associées à la var

APA, Harvard, Vancouver, ISO, and other styles

30

Barroso, Cássia Pianca. "Variabilidade espaço-temporal da morfologia costeira: resultados de sensoriamento remoto." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/21/21136/tde-16032015-155053/.

Full text

Abstract:

A habilidade de prever mudanças morfológicas nas regiões costeiras é restringida pela falta de dados observacionais com suficiente resolução espacial e temporal. Com o desenvolvimento do sensoriamento remoto, esse problema pode ser minimizado, especialmente com o uso de câmeras de vídeo para o estudo de regiões costeiras. Os objetivos dessa tese são, através do uso de imagens de vídeo, (1) desenvolver um método robusto para extrair a localização da linha de costa; (2) analisar um conjunto de dados inéditos de 26 anos de imagens diárias; (3) caracterizar as escalas espaciais e temporais da vari

APA, Harvard, Vancouver, ISO, and other styles

31

Koks, Josephus [Verfasser], Edzo [Akademischer Betreuer] Veldkamp, Alexander [Gutachter] Knohl, and Heinz [Gutachter] Flessa. "Tropical forest conversion to rubber and oil palm plantations: landscape-scale and inter-annual variability of soil greenhouse gas (GHG) fluxes and the contribution of tree-stem emissions to the soil GHG budget in Jambi province, Sumatra, Indonesia / Josephus Koks ; Gutachter: Alexander Knohl, Heinz Flessa ; Betreuer: Edzo Veldkamp." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1213096316/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Barral, Quentin-Boris. "Caractérisation du front Nord-Baléares : Variabilité et rôle de la circulation des masses d'eau en Méditerranée Occidentale." Electronic Thesis or Diss., Toulon, 2022. http://www.theses.fr/2022TOUL0006.

Full text

Abstract:

La Méditerranée Occidentale est l’un des bassins avec le plus de pollution plastique au monde, et son réchauffement de surface est quatre fois plus intense que celui des océans. Elle est dite "bassin laboratoire" pour l’étude de l’océan global : elle développe sa propre circulation de retournement. Sa courantologie est composée de 4 couches et d’environ 6 masses d’eau. La rencontre de deux masses d’eau de différentes températures et salinités en surface crée un front thermohalin. Cette thèse présente des avancées récentes sur la caractérisation des zones de fronts et sur la dynamique des masse

APA, Harvard, Vancouver, ISO, and other styles

33

Mayot, Nicolas. "La saisonnalité du phytoplancton en Mer Méditerranée." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066440/document.

Full text

Abstract:

Le phytoplancton est un élément primordial dans les réseaux trophiques marins et il est un acteur principal dans les cycles biogéochimiques de la planète. Cependant, des incertitudes subsistent autour des facteurs environnementaux influençant sa saisonnalité ainsi que sa capacité à se développer. L’objectif majeur de cette thèse est d’étudier la réponse du phytoplancton à la variabilité interannuelle des facteurs environnementaux en Mer Méditerranée. Plus précisément, il s’agit de déterminer l’influence de ces derniers sur la saisonnalité du phytoplancton.Dans un premier temps, la variabilité

APA, Harvard, Vancouver, ISO, and other styles

34

Boulanger, Xavier. "Modélisation du canal de propagation Terre-Espace en bandes Ka et Q/V : synthèse de séries temporelles, variabilité statistique et estimation de risque." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0009/document.

Full text

Abstract:

Les bandes de fréquences utilisées conventionnellement pour les systèmes fixes de télécommunication par satellites (bandes C et Ku i.e. 4-15 GHz) sont congestionnées. Néanmoins, le marché des télécommunications civil et de défense accuse une demande de plus en plus importante en services multimédia haut-débit. Par conséquent, l'augmentation de la fréquence porteuse vers les bandes Ka et Q/V (20-40/50 GHz)est activement étudiée. Pour des fréquences supérieures à 5 GHz, la propagation des signaux radioélectriques souffre de l'atténuation troposphérique. Parmi les différents contributeurs à l'aff

APA, Harvard, Vancouver, ISO, and other styles

35

Omar, Youssouf Moussa. "Etude de l'habitat épipélagique du Golfe de Tadjourah (Djibouti) : structures de variabilité et processus qui les gouvernent." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0017/document.

Full text

Abstract:

L’objectif de cette thèse est d’étudier les caractéristiques physiques et biogéochimiques de l’habitat épipélagique (0-200 m), ses variabilités spatio-temporelles et les processus qui les gouvernent dans le Golfe de Tadjourah (Djibouti). L’analyse spectrale singulière (SSA) et la fonction empirique orthogonale (EOF) sont appliquées à deux jeux des données satellitales dérivées du radiomètre AVHRR_MetopA et des capteurs de la couleur de l’océan (Modis et Meris). Cette analyse statistique montre que les variabilités de la température de la surface de la mer (SST) et de la concentration de la chl

APA, Harvard, Vancouver, ISO, and other styles

36

Ahmad, Hafiz Bashir. "Intraspecific variability in embolism resistance and functional trade-offs in sunflower (Helianthus annuus L.) and Maritime pine (Pinus pinaster Ait.)." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0747/document.

Full text

Abstract:

Plusieurs études ont montré que la productivité des forêts et des cultures décroît sur l’ensemble de la planète en réponse au changement climatique, et que les risques de mortalité liée à la sécheresse s’accroissent. Ces mortalités massives ont été observées dans tous les écosystèmes forestiers et seraient dues à un dysfonctionnement hydraulique des plantes, causé par de l’embolie xylémiène. Le spectre interspécifique de résistance à l'embolie a été largement étudiée, mais peu d'attention a été accordée à la variabilité intra-spécifique de ce trait. C’est pourquoi, l’objectif de ce travail de

APA, Harvard, Vancouver, ISO, and other styles

37

Sandström, Helena. "Contouring variability in radiosurgery - dosimetric and radiobiological implications." Licentiate thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-123252.

Full text

Abstract:

The use of Stereotactic Radiation Therapy (SRT) employing one large fraction of radiation, as in stereotactic radiosurgery (SRS), or few fractions of high doses, has continuously increased due to the technical development and the progress in dose delivery complemented by the positive clinical experience. The success of stereotactic radiation therapy depends on many clinical, dosimetric and radiobiological factors. For SRS in particular, the delivery of a highly conformal dose distribution to the target in one fraction allowing at the same time the sparing of the normal tissue and the critical

APA, Harvard, Vancouver, ISO, and other styles

38

Huttunen, K. L. (Kaisa-Leena). "Biodiversity through time:coherence, stability and species turnover in boreal stream communities." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211602.

Full text

Abstract:

Abstract Describing how and why species composition of ecological communities varies across spatial and temporal scales is a primary objective for ecological research. A key challenge is to distinguish changes in community composition resulting from external factors from the natural background variability. In this thesis I aimed to study: 1) the level of temporal variation in community composition of stream macroinvertebrates, 2) the role of different environmental factors to temporal variability, 3) the effect of temporal variability on bioassessment outcomes, and 4) comparability of differen

APA, Harvard, Vancouver, ISO, and other styles

39

Liguori, Antonio. "Stima della variabilità intra-annuale del regime dei deflussi idrici superficiali in bacini non strumentati." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/8061/.

Full text

Abstract:

La curva di durata di lungo periodo (POR) è uno strumento grafico molto efficace che mette in evidenza la relazione fra intensità e frequenza delle portate osservate in un determinato intervallo temporale. Essa è ricavata dall'idrogramma dei deflussi, ma presenta il problema della perdita di informazioni relative alla variabilità annuale e stagionali delle portate. Per tal motivo si è reso necessario l'utilizzo di due nuove interpretazioni delle curve di durate: le curve di durata annuali (alle quali può essere associato il concetto di percentile e quindi di probabilità di superamento di un pa

APA, Harvard, Vancouver, ISO, and other styles

40

Mayot, Nicolas. "La saisonnalité du phytoplancton en Mer Méditerranée." Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066440.

Full text

Abstract:

Le phytoplancton est un élément primordial dans les réseaux trophiques marins et il est un acteur principal dans les cycles biogéochimiques de la planète. Cependant, des incertitudes subsistent autour des facteurs environnementaux influençant sa saisonnalité ainsi que sa capacité à se développer. L’objectif majeur de cette thèse est d’étudier la réponse du phytoplancton à la variabilité interannuelle des facteurs environnementaux en Mer Méditerranée. Plus précisément, il s’agit de déterminer l’influence de ces derniers sur la saisonnalité du phytoplancton.Dans un premier temps, la variabilité

APA, Harvard, Vancouver, ISO, and other styles

41

XuHan, Xu. "L'embryogénèse somatique chez le tournesol (Helianthus annuus L. ) : comparaison avec l'embryogénèse zygotique." Toulouse, INPT, 1999. http://www.theses.fr/1999INPT008A.

Full text

Abstract:

L'embryogenese somatique chez le tournesol (helianthus annuus l. ), comparaison avec l'embryogenese zygotique. Dans le but d'accroitre la production d'embryons somatiques, un genotype recalcitrant a ete etudie par comparaison avec un genotype non-recalcitrant. Les embryogeneses primaire, secondaire et cyclique ainsi que leur utilisation pour le transfert de genes dans les tissus embryogenes ont ete developpees avec succes. Les mecanismes cellulaires et moleculaires impliques dans l'embryogenese somatique et les effets des tissus environnants ont ete etudies chez le genotype non-recalcitrant pa

APA, Harvard, Vancouver, ISO, and other styles

42

Azpiroz, Rivero Hilda Susana. "Analyse de la variabilité génétique d'Helianthus annuus à partir de la culture d'embryons." Paris 11, 1989. http://www.theses.fr/1989PA112136.

Full text

Abstract:

Ce travail fait état de deux applications concrètes de la culture d'embryons immatures à l'amélioration du tournesol, l'objectif sous-jacent étant d'évaluer la variabilité génétique du matériel sur lequel ont été appliquées ces techniques. 1-L'une permet de créer des contraintes hydriques durant la culture "in vitro" au stade juvénile (embryon ou plantule), afin de sélectionner le matériel plus résistant au déficit hydrique. 2-L'autre se réfère à la culture "in vitro" des embryons immatures dans la fixation de lignées pures par la méthode de filiation monograine (SSD), afin d'accélérer la séle

APA, Harvard, Vancouver, ISO, and other styles

43

Persson, Anna. "Heart rate variability for driver sleepiness assessment." Thesis, Linköpings universitet, Institutionen för medicinsk teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157187.

Full text

Abstract:

Studies have reported that around 20 % of all traffic accidents are caused by a sleepy driver. Sleepy driving has been compared to drunk driving. A sleepy driver is also an issue in the case of automated vehicles in the future. Handing back the control of the vehicle to a sleepy driver is a serious risk. This has increased the need for a sleepiness estimation system that can be used in the car to warn the driver when driving is not recommended. One commonly used method to estimate sleepiness is to study the heart rate variability, HRV, which is said to reflect the activity of the autonomous ne

APA, Harvard, Vancouver, ISO, and other styles

44

Maury, Pierre. "Adaptation à la sécheresse et photosynthèse chez le tournesol (helianthus annuus l. )." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT011A.

Full text

Abstract:

Les mecanismes impliques dans la regulation du fonctionnement photosynthetique en periode seche sont plus ou moins rapidement reversibles, perturbant le fonctionnement de la plante apres rearrosage. L'objectif du travail est d'etudier la reponse genotypique du tournesol (helianthus annuus l. ) a une acclimatation au deficit hydrique, par analyse des capacites de regulation de l'energie lumineuse, et d'assimilation du co#2, a partir de modeles biochimiques. L'acclimatation induit, chez l'hybride viki, des modifications du fonctionnement du chloroplaste. Celles-ci se traduisent apres retour a de

APA, Harvard, Vancouver, ISO, and other styles

45

GAGNE, GENEVIEVE. "Variabilite de populations d'orobanche cumana - genetique de la resistance a l'orobanche chez le tournesol (helianthus annuus l. )." Clermont-Ferrand 2, 2000. http://www.theses.fr/2000CLF22186.

Full text

Abstract:

L'orobanche, orobanche cumana, est une angiosperme, parasite des racines du tournesol (helianthus annuus l. ). Originaire du bassin mediterraneen, elle cause d'importants degats dans les pays producteurs excepte en france. Cinq races d'orobanche ont ete caracterisees dans les pays de l'est (elle est observee en russie des le debut du siecle) et 4 en espagne (ou elle est apparue en 1958). Ces races seraient controlees par des genes notes or. Mais l'etude de la genetique de la resistance n'est pas encore bien comprise. La capacite du pathogene a surmonter les resistances et sa facilite de dissem

APA, Harvard, Vancouver, ISO, and other styles

46

Dräger, Nadine [Verfasser], and Achim [Akademischer Betreuer] Brauer. "Holocene climate and environmental variability in NE Germany inferred from annually laminated lake sediments / Nadine Dräger ; Betreuer: Achim Brauer." Potsdam : Universität Potsdam, 2017. http://d-nb.info/1218401508/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Junior, Hugo Jose Tozze. "Caracterização e identificação de espécies de Colletotrichum associadas à antracnose do pimentão (Capsicum annuum) no Brasil." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-20032008-151208/.

Full text

Abstract:

A antracnose é uma das doenças mais importantes do pimentão em vários países. Por muitos anos, somente C. gloeosporioides foi relatado como agente causal da antracnose desta cultura no Brasil. Entretanto, recentemente C. acutatum e C. capsici também tem sido associados a esta doença em algumas regiões do país. Neste trabalho, 56 isolados de Colletotrichum obtidos de pimentão e procedentes de diferentes regiões produtoras do país foram caracterizados e identificados por meio de algumas características morfológicas e culturais, e pela análise por PCR utilizando oligonucleotídeos espécie-específi

APA, Harvard, Vancouver, ISO, and other styles

48

Seviour, William J. M. "Variability of the polar stratosphere and its influence on surface weather and climate." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ed566f6a-cc23-40c7-8237-465646058eb5.

Full text

Abstract:

Research during the last two decades has established that variability of the winter polar stratospheric vortex can significantly influence the troposphere, affecting the likelihood of extreme weather events and the skill of long-range weather forecasts. This influence is particularly strong following the rapid breakdown of the vortex in events known as sudden stratospheric warmings (SSWs). This thesis addresses some outstanding issues in our understanding of the dynamics of this stratospheric variability and its influence on the troposphere. First, a geometrical method is developed to characte

APA, Harvard, Vancouver, ISO, and other styles

49

O'Donnell, Alison J., Kathryn J. Allen, Robert M. Evans, Edward R. Cook, and Valerie Trouet. "Wood density provides new opportunities for reconstructing past temperature variability from southeastern Australian trees." Elsevier B.V, 2016. http://hdl.handle.net/10150/621340.

Full text

Abstract:

Tree-ring based climate reconstructions have been critical for understanding past variability and recent trends in climate worldwide, but they are scarce in Australia. This is particularly the case for temperature: only one tree-ring width based temperature reconstruction – based on Huon Pine trees from Mt Read, Tasmania – exists for Australia. Here, we investigate whether additional tree- ring parameters derived from Athrotaxis cupressoides trees growing in the same region have potential to provide robust proxy records of past temperature variability. We measured wood properties, in

APA, Harvard, Vancouver, ISO, and other styles

50

Rachid, Alchaarani Ghias. "Variabilité génétique et identification des QTLs liés à la qualité des semences chez le tournesol (Helianthus annuus L. )." Toulouse, INPT, 2004. http://www.theses.fr/2004INPT002A.

Full text

Abstract:

Afin de progresser dans le domaine de la sélection assistée par marqueurs moléculaires chez le tournesol, nous avons réalisé plusieurs expérimentations sur une population de lignées recombinantes (RILs) issues du croisement entre deux génotypes 'PAC-2' et 'RHA-266'. La variabilité génétique pour la résistance partielle au mildiou (Plasmopara halstedii) et à la maladie des taches noires (Phoma macdonaldii), ainsi que pour quelques caractères d'intérêt agronomique et des paramètres de la germination et du développement des plantules ont été étudiés chez les RILs et leurs parents. L'analyse de va

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!