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Dissertations / Theses on the topic 'Varying environments'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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1

Collins, Joseph P. "Branching processes with varying environments." Thesis, University of Bath, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607471.

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This thesis concentrates on Branching Processes. We look at applying spine techniques and martingale changes of measure in order to first provide alternative proofs of well known discrete-time results concerning Branching Processes in Random Environments. We then apply the same ideas in a different setting to study Branching Brownian Motion with a Random Environment, focussing on the long-term spatial behaviour of the process. The final area of interest is Branching Brownian Motion with absorption at the origin, where we consider t he asymptotic behaviour of the survival probabilities near cri
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2

Baumann, Andrea. "Robot motion planning in time varying environments." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963283677.

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3

Aydogmus, Murat. "Multireceiver acoustic communications in time-varying environments." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/42577.

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Approved for public release; distribution is unlimited<br>In this thesis, we present a two-receiver underwater acoustic communications system. It is based on the Kalman filter for equalization and tracking of acoustic channels characterized by considerable multipath. To model this channel and its dependency on the ocean environment we use the Bellhop acoustic ray tracing model. Error-correction coding is applied to the source data. Recursively updated channel estimates are used to update the state filters and tracking of the channel. It is shown that, under moderate conditions of Doppler shift
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4

Pfeiffer, Barbara [Verfasser]. "Path Planning and Location Problems with Varying Environments / Barbara Pfeiffer." Aachen : Shaker, 2006. http://d-nb.info/1186584963/34.

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5

ROEHL, NITZI MESQUITA. "ONLINE TRAINING OF NEURAL METWORKS: METHODOLOGY FOR TIME VARYING ENVIRONMENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1998. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8593@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>CENTRO DE PESQUISA DE ENERGIA ELÉTRICA<br>Lidar com processos não estacionários requer adaptação rápida e, simultaneamente, evitar esquecimento catastrófico de um comportamento passado. Duas técnicas de treinamento em redes neurais que satisfazem este requerimento são propostas, uma no âmbito de aprendizado com supervisão e outra relacionada à classe de redes não supervisionadas. Um novo algoritmo de treinamento supervisionada em redes multi camadas para modelagem de sistemas num contexto não estacionário é proposto. O a
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Brändström, Samuel. "Invasion-analysis of stage-structured populations in temporally-varying environments." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149324.

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Climate change may cause epidemic threats as species spreading human diseases invades previously unpopulated areas. A species can establish in new areas if they fulfills an invasion criterion. Two common invasion criteria are the long-term exponential growth-rate, r, and the basic reproduction number, R0, that measures the population's exponential growth in time and growth between generations respectively. Previous work have determined the long-term exponential growth-rate of the mosquito Aedes aegypti, a vector spreading dengue, zika and yellow fever, in Europe. However, in epidemiology r is
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7

Persson, Torgny. "Genetic expression of Scots pine growth and survival in varying environments /." Umeå : Dept. of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200655.pdf.

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8

Khan, Maqsood Ahmad. "Titanium alloys : in-vitro corrosion and wear within varying biological environments." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266093.

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9

Land, Miriam L. "On measuring differential yielding abilities of wheat cultivars over varying environments." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9925.

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10

Poessel, Sharon A. "Ecology and Behavior of Coyotes in Urban Environments at Varying Spatial Scales." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4257.

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Increasing global urbanization has altered landscapes for many wildlife species, including carnivores. Some carnivore species have been able to adapt to and even thrive in urban environments, including coyotes (Canis latrans). As coyotes continue to settle in more urban areas, human-coyote conflicts, such as attacks on humans or pets, are also increasing. Understanding the various factors affecting space use of urban coyotes may assist wildlife officials in reducing such conflicts. We conducted three studies of urban coyotes at varying spatial scales. First, using a captive population of coyot
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11

Wetz, Matthias [Verfasser]. "Transmission methods for wireless multi carrier systems in time-varying environments / Matthias Wetz." Ulm : Universität Ulm. Fakultät für Ingenieurwissenschaften und Informatik, 2011. http://d-nb.info/1018024808/34.

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12

Khera, Tanya. "The diversity and distribution of Mycobacterium species in varying ecological and climatic environments." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/51639/.

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The species within the genus Mycobacterium are commonly detected in a variety of environments including soil, water and dust. Many species within the group are capable of causing opportunistic diseases and are hypothesised to be responsible for the reduction in BCG efficacy in tropical countries. Consequently it is important to understand the diversity and biogeography of mycobacteria in the environment. Soil and water samples were collected from a total of 42 residential sites in 9 different climatic regions. To determine community composition, community DNA was extracted and amplicon pyroseq
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13

Lai, Hui-Chen. "Simulink-based implementation and performance analysis of TDS-OFDM in time-varying environments." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/43943.

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Approved for public release; distribution is unlimited<br>In this thesis, we develop simulink-based software models to implement and test the time-domain synchronous OFDM (TDS-OFDM) transmitter and receiver systems. This technique has been introduced in terrestrial digital broadcasting in the P.R.C., and it seems to be particularly suitable to highly mobile environments. The transmission channel is modeled as a time-varying Rayleigh multipath channel. Two standard transmission channels models are considered: the COST 207 model with 6-path typical urban (TU6) characteristics and the China test8
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14

Hamilton, Kevin Michael. "Heuristic based multi-manipulator motion planning in time varying environments with fault tolerance." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388093.

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15

Herron, Ciara. "Wreck-site formation processes in varying energy environments : an investigation in Irish coastal waters." Thesis, University of Ulster, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414105.

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16

Blades, Christoffer, and Filiz Boyraz. "Elevator Supervisory Group Control systems : Analyzing the performance of elevator assignment algorithms in varying environments." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166467.

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Elevators are used every day and that puts expectations on how fast an elevator can handle passenger requests. This report aims to describe different elevator assignment algorithms for Elevator Supervisory Group Control (ESGC) systems and compare them to each other, with an emphasis on the delay time. To research the field of ESGC systems four different algorithms were chosen and implemented: Simple control, Zone control, Collective control and Fuzzy control. The algorithms were also chosen in such a way that their strategies differentiated from each other to some degree. The algorithms were t
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Hohenberger, Johannes [Verfasser], and Karsten [Gutachter] Meyer. "Activation of Small Molecules at Iron Complexes in Varying Trigonal Ligand Environments / Johannes Hohenberger ; Gutachter: Karsten Meyer." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1140917099/34.

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18

Lake, Graciela Esther. "Quantification of potential arsenic bioavailability in spatially varying geologic environments at the watershed scale using chelating resins." Texas A&M University, 2002. http://worldcat.org/oclc/391591271/viewonline.

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19

Redd, Sarah M. "Effects of varying environments on the ecology and evolution of the New Zealand Mud Snail and its interactors." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/s_redd_100109.pdf.

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Thesis (M.S. in zoology)--Washington State University, December 2009.<br>Title from PDF title page (viewed on Jan. 21, 2010). "Department of School of Biological Sciences." Includes bibliographical references (p. 34-40).
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20

Beunardeau, Roland. "Risks And returns Of fixed income arbitrage strategies in varying economic environments : a model based on empirical considerations." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90233.

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Thesis: S.M. in Management Studies, Massachusetts Institute of Technology, Sloan School of Management, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 164-165).<br>I propose a discrete time model of financial markets in which an arbitrageur has investment opportunities but faces a number of financial constraints. Investment opportunities arise when the price discrepancy between a pair of similar assets becomes large enough. I propose an innovative way to model the effects of market liquidity and the arbitrage industry's reversion force on a stochast
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21

Imort-Just, Nina Annik [Verfasser], and Jörn [Akademischer Betreuer] Bennewitz. "Analyses of quantitative traits in varying environments in pigs and Brown Swiss cattle / Nina Annik Imort-Just ; Betreuer: Jörn Bennewitz." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2020. http://d-nb.info/1207389242/34.

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22

Imort-Just, Annik [Verfasser], and Jörn [Akademischer Betreuer] Bennewitz. "Analyses of quantitative traits in varying environments in pigs and Brown Swiss cattle / Nina Annik Imort-Just ; Betreuer: Jörn Bennewitz." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2020. http://d-nb.info/1207389242/34.

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23

Hutchison, Andrew John. "Making sense of varying standards of care : front-line staff experiences of working in residential care environments for adults with learning disabilites." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5294/.

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Current evidence suggests that people with learning disabilities living in residential facilities are being exposed to considerable variation in the standards of care they receive. While attempts have been made to understand variations in care standards and factors associated with abusive or neglectful practices, there remains a need for more research in this area. Additionally, little attention has been paid to understanding support staff experiences of working in residential or inpatient services and to developing a more theoretical understanding of the role they fulfil. Using Interpretive P
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24

Míča, Ivan. "Optimalizovaná detekce řečové aktivity v prostředí s proměnnými vlastnostmi." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-233660.

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This thesis deals with the issue of algorithmic voice activity detection. Impacts of adverse conditions on the reliability of detection is analysed, and main historical and up-to-date approaches to this issue are discussed. Simulations on both synthetic, and application specific labeled speech databases are used to support the theoretical analysis of important VAD methods. Based on the theoretical analysis together with the performance results, an optimization is proposed that is capable to overcome some limitations of the current methods when dealing with variable working conditions.}
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25

Jaffri, Sarah. "Characterization of the photosynthetic apparatus of Chlorella BI sp., an Antarctica mat alga under varying trophic growth states." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1304348068.

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26

Kiam, Jane Jean [Verfasser], Axel [Akademischer Betreuer] Schulte, Axel [Gutachter] Schulte, and Eva [Gutachter] Besada-Portas. "Al-Based Mission Planning for High-Altitude Pseudo-Satellites in Time-Varying Environments / Jane Jean Kiam ; Gutachter: Axel Schulte, Eva Besada-Portas ; Akademischer Betreuer: Axel Schulte ; Universität der Bundeswehr München, Fakultät für Luft- und Raumfahrttechnik." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2019. http://d-nb.info/1224617231/34.

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27

Kiam, Jane Jean [Verfasser], Axel Akademischer Betreuer] Schulte, Axel [Gutachter] Schulte, and Eva [Gutachter] [Besada-Portas. "Al-Based Mission Planning for High-Altitude Pseudo-Satellites in Time-Varying Environments / Jane Jean Kiam ; Gutachter: Axel Schulte, Eva Besada-Portas ; Akademischer Betreuer: Axel Schulte ; Universität der Bundeswehr München, Fakultät für Luft- und Raumfahrttechnik." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2019. http://d-nb.info/1224617231/34.

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Kiam, Jane Jean [Verfasser], Axel [Akademischer Betreuer] Schulte, Axel Gutachter] Schulte, and Eva [Gutachter] [Besada-Portas. "Al-Based Mission Planning for High-Altitude Pseudo-Satellites in Time-Varying Environments / Jane Jean Kiam ; Gutachter: Axel Schulte, Eva Besada-Portas ; Akademischer Betreuer: Axel Schulte ; Universität der Bundeswehr München, Fakultät für Luft- und Raumfahrttechnik." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2019. http://nbn-resolving.de/urn:nbn:de:bvb:706-7008.

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29

Lin, Gregory Galen. "Adaption to a varying auditory environment." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40596.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.<br>Includes bibliographical references (leaf 40).<br>by Gregory Galen Lin.<br>M.Eng.
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30

Marshall, Harry. "Social foraging behaviour in a varying environment." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11178.

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Social foraging behaviour has an important influence on individuals’ survival and reproduction through its role in the acquisition of food resources. It also determines the amount of foraging time required in differing environments, and so the amount of time available for other activities, such as socialising and resting, which have been implicated in an individual’s fitness, as well as the stability of the wider social group. In this thesis I explore the links between these two processes by investigating the drivers of social foraging behaviour, and how the foraging time budgets that this beh
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31

Wilson, John Michael. "Robust communication in a time-varying noisy environment." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80062.

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Matched filter detectors are used to detect known signal waveforms transmitted under noisy conditions. Moving-average matched filters (MAMF's) are a class of digital filters whose performance is measured in terms of Signal to Noise Ratio (SNR). The overall performance of a MAMF is described by the SNR Improvement (SNRI) which is the ratio of Output SNR (OSNR) to Input SNR (ISNR). The OSNR and ISNR are the SNR at the output and input of the MAMF respectively. SNRI is maximized by maximizing OSNR since ISNR is fixed for a received signal and noise. The OSNR of a MAMF is a function of the noise a
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32

Perkins, Kerry. "Cuttlefish (Sepia officinalis) camouflage in varying environmental conditions." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/68322/.

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Cephalopods first appeared around 500 million years ago. Since then they have developed from the external shelled ammonites, belemnites and nautiloid's to the soft bodied organisms we find today. By becoming soft bodied, protection which would have been provided by the shell was lost and a different approach to predator avoidance was adopted. Modern day cephalopods such as octopus, squid and cuttlefish frequently use camouflage techniques to avoid detection. In addition to countershading, which is an often used camouflage technique by aquatic species, the presence of chromatophores allow a ver
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Gopinath, Rakesh. "Concrete carbonation prediction for varying environmental exposure conditions." Doctoral thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32700.

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The Durability Index (DI) approach has been developed in South Africa, in order to improve the durability performance of reinforced concrete structures. The DI approach is based on durability index tests, which are linked to transport mechanisms related to particular deterioration processes (Alexander et al., 1999a). Carbonation of concrete is governed, inter alia, by the microstructure and the transport characteristics of the concrete. A carbonation model with permeability coefficient (k) from the Oxygen Permeability Index (OPI) test as the key material variable was developed by Salvoldi (201
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34

Rostek, Mateusz. "Constructing steel modular buildings with varying interconnections." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119321.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 86-88).<br>Modular construction uses prefabricated building components called modules, which are fabricated in a factory, transported to a site, and then assembled together to create a building. A "module" is one of the building blocks used to construct a modular building and may be comprised of a load bearing structure, MEP components, interior finishes, and exterior cladding. This alternate way
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35

Czarnota, Jenna. "Modeling Spatially Varying Effects of Chemical Mixtures." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4361.

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Cancer incidence is associated with exposures to multiple environmental chemicals, and geographic variation in cancer rates suggests the importance of accommodating spatially varying effects in the analysis of environmental chemical mixtures and disease risk. Traditional regression methods are challenged by the complex correlation patterns inherent among co-occurring chemicals, and the applicability of geographically weighted regression models is limited in the setting of environmental chemical risk analysis. In comparison to traditional methods, weighted quantile sum (WQS) regression performs
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Gieleghem, Ryan Thomas. "Robust acoustic signal detection and synchronization in a time varying ocean environment." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78186.

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Thesis (S.M.)--Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and the Woods Hole Oceanographic Institution), 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 99-100).<br>Signal detection and synchronization in the time varying ocean environment is a difficult endeavor. The current common methods include using a linear frequency modulated chirped pulse or maximal length sequence as a detection pulse, then match filtering to that signal. In higher signal to noise ratio (SNR)
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37

Janeski, John. "Dynamics of an Electrodynamic Tether System in a Varying Space-Plasma Environment." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23922.

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Electrodynamic tethers have a wide range of proposed applications in the fields of satellite propulsion and space plasma research. The fundamental purpose of this dissertation is to improve the understanding of the behavior of an electrodynamic tether (EDT) system in Earth's ionosphere. An electrodynamic tether system consists of two satellites connected by a long tether that generates current to produce either power or thrust via the system's electromagnetic interaction with the space environment. Previous electrodynamic tether investigations decouple the interaction between the tether and t
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38

Sandholm, Suzanne, and Susanne Gerndt. "Barns rörelse i förskolans verksamhet : Hur rörelseaktiviteter integreras i förskolans verksamhet enligt uppfattningar från förskollärare." Thesis, Linnéuniversitetet, Institutionen för utbildningsvetenskap (UV), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-68844.

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Syftet med den här studien är att bidra med kunskap om varför det är viktigt att barn får delta i olika rörelseaktiviteter på förskolan. Uppsatsen kommer bland annat att lyfta hur förskollärare tänker kring rörelse, vilka former av rörelse som integreras samt vilka förutsättningar pedagogerna upplever att de har när det gäller att erbjuda barnen olika rörelseaktiviteter. Studien har genomförts med en induktiv kvalitativ forskningsmetod, genom intervjuer av förskollärare. De intervjuade har valts ut efter i vilka miljöer deras förskoleverksamheter är belägna. Miljöerna
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Reich, Torsten. "Development of a digital SQUID magnetometer for widely varying fields in urban environment." Ilmenau ISLE, 2009. http://d-nb.info/999193260/04.

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Liu, Xinyi. "Modelling the mechanical response of Japanese lacquer (urushi) to varying environmental conditions." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/9308.

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Urushi is a complex natural polymer that has been used to protect and decorate objects for many hundreds of years. Urushi is an important material as decorated objects can obtain great value and historical worth. A star item of urushi lacquerwares, the Mazarin Chest, property of Victoria & Albert (V&A) Museum in London, is famous as one of the finest pieces of Japanese lacquerware in the world, dating back to as early as the late 1630s. These urushi lacquerwares are often exposed to environments that are detrimental to both their aesthetic appeal and structural performance, and restoration and
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Sun, Wei. "3-D collision detection and path planning for mobile robots in time varying environment." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182522950.

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42

Bohora, Anil R. "Visual robot guidance in time-varying environment using quadtree data structure and parallel processing." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182282896.

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Eleftheriou, Evangelos Carleton University Dissertation Engineering Electrical. "Adaptive filtering in a time-varying environment with applications to equalization of fading HF channels." Ottawa, 1985.

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Al, Minshid Alaa Hani Naser. "Surface chemistry of metal oxide nanoparticles in biological and environmental media of varying pH." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6359.

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Investigate the interaction of nanomaterials with biological systems, known as nano-bio interaction is of great interest for the assessment of the concern arising from nanomaterials progressive use. Such interaction determines nanomaterials potential effect on human and environment becomes more and more important to understand how they interact with living organisms and the environment. The novel physicochemical characteristics of nanomaterials, such as their small size, large surface area to volume ratio and surface energy, may initiate new toxicological effects due to nanomaterials ability t
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Vidakovic, Steven Slavko. "Fluid dynamic means of varying the thrust vector from an axisymmetric nozzle /." Title page, summary and contents only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phv648.pdf.

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Schmitzer, Daemon Thomas. "Diversity of Shenango River Fish at Sites with Varying Types of Land Use." Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1285260725.

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47

Koeninger, Nicole K. "Determining Soil Erosion with Varying Corn Stover Cover Factors." UKnowledge, 2015. http://uknowledge.uky.edu/bae_etds/27.

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Since the Dust Bowl, conservation agriculture has become a common practice globally. Because of the rising interest in the use of corn biomass as a feedstock for biofuel production, the effects of corn stover removal on soil erosion were explored. It was hypothesized that selective harvesting strategies would impact soil erosion differently across a variety of slopes. Soil erosion boxes were constructed, and a rainfall simulator with an intensity of 30 mm hr-1 for 46 min was used to create runoff from slopes of 1, 5, and 10% and three cover factor treatments (no removal and two simulated corn
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Vessby, Karolina. "Distribution and reproduction of dung beetles in a varying environment : implications for conservation of semi-natural grasslands /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5823-4.pdf.

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Wu, Chumeng. "Effects of varying environmental conditions on performance of completely autotrophic nitrogen removal from dewatered sludge liquors." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43236.

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Centrate, an ammonia rich wastewater, usually contains high concentrations of ammonia (around 1000 mg/L) and accounts for about 20% of total nitrogen loading to wastewater treatment plants. However, the conventional nitrification/denitrification approach for centrate treatment is costly to operate and releases a large quantity of carbon dioxide, due to the addition of organic compounds for denitrification. A brand new approach for nitrogen management is a novel process called anaerobic ammonium oxidation (ANAMMOX). ANAMMOX offers a cost effective solution for centrate treatment. Compared to th
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Goodson, Joanne Marie. "Environmental controls on the colonisation and establishment of vegetation on river banks under varying grazing pressure." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289259.

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