Дисертації з теми "Nature variables"
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Jones, William I. "Examining Preservice Science Teacher Understanding of Nature of Science: Discriminating Variables on the Aspects of Nature of Science." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284776708.
Повний текст джерелаFields, Alexander James. "Nature of anger in the workplace| Exploration of relevant variables and their structure." Thesis, The University of Texas at San Antonio, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1605134.
Повний текст джерелаIn the workplace, counter productive work behaviors (CWBs) are strongly discouraged. Vardi and Weitz (2004) concluded that counter productive work behaviors are a fairly common occurrence and cost businesses billions of dollars each year. Many of these CWBs are perpetrated by angry or disgruntled employees. When angry employees are identified they can be helped with coping strategies to productively manage their anger, as opposed to engaging in CWBs (Hargrave, Hiatt, Dannenbaum, & Shaffer, 2008). This paper seeks to better equip professionals and researchers with tools to identify these at risk employees. Specifically the Anger Parameters Scales (APS) and the Anger Expressions Scale (AES) have been examined in a workplace sample for the first time. Additionally this study has examined the use of more readily available demographic information to predict at risk persons. The expected factors of the measures in question did not emerge as predicted by the AES. The factor structure of the APS was partially validated as four of the five scales loaded well enough for further analysis. None of these scales could be captured by more available demographic variables. This study also gathered normative data on anger elicitors by means of coding narratives of participants who were asked to describe a typical anger provoking situation.
DiPietro, Domenic J. "Effects of Nature and City Sounds on Physiological and Psychological Variables in College Students." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1597857209685718.
Повний текст джерелаPollard, Karen R. "The nature of the low mass supergiants : RV Tauri and R Coronae Borealis variables." Thesis, University of Canterbury. Astronomy, 1994. http://hdl.handle.net/10092/7632.
Повний текст джерелаBastille-Denis, Emmanuelle. "La nature et le rôle des variables psychologiques comme facteurs de maintien du trouble lié à l'horaire de travail." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26289.
Повний текст джерелаPrzyjemski, Katrina. "Natural language variables : variable-based semantic theories of pronouns and proper names." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:2ec9cd7c-5fe3-4dd5-ae3b-e94e317246c1.
Повний текст джерелаSarrazin, Philippe. "Motivation a l'accomplissement dans les activites motrices : mise en evidence de processus et variables affectant les croyances relatives a la nature de l'habilete motrice, le choix d'une difficulte, l'effort fourni et la performance." Paris 11, 1995. http://www.theses.fr/1995PA112394.
Повний текст джерелаStump, Simon. "Natural enemies in a variable world." Thesis, The University of Arizona, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3718576.
Повний текст джерелаNatural enemies are ubiquitous in nature. In many communities, natural enemies have a major effect on the diversity of their prey. Their effects are very diverse: they can promote or undermine the ability of their prey to coexist through a variety of mechanisms. As such, an important step in understanding how diversity is maintained will be to understand how different forms of predator behavior affect prey coexistence. In this dissertation, I study how two major types of predators affect plant coexistence in two different communities.
First, I study natural enemies in tropical forests, using both theory and empirical work. In tropical forests, most natural enemies are thought have a narrow host range, and be distance-responsive (i.e., mainly harm seeds and seedlings that are near adults of their main host). Previous theoretical work has shown that specialized natural enemies can maintain diversity of their prey, whether or not they are distance-responsive. However, it is unknown whether specialist natural enemies are more or less able to promote prey coexistence if they are distance-responsive. Using theoretical models, I show that distance-responsive predators are less able to maintain diversity. Additionally, I show that habitat partitioning does not interfere with the ability of distance-responsive predators to maintain diversity, even if it causes seedling survival to be highest near conspecific adults.
From an empirical aspect, I studied the host range of seed-associated fungi. Soil-borne microbes, such as fungi, are thought to play an important role in maintaining diversity in tropical forests. However, the microbial community itself is often treated as a black box, and little is known about which microbes are causing major effects, or how specialized seed-microbe associations are. Here I use experimental inoculations to examine the host range and effect of a guild of seed-associated fungi that are thought to be mainly pathogens. I show that fungal species are differentially able to colonize different seed species, and have species-specific effects on seed germination. I show that in many cases, plant phylogeny, and to a lesser extent fungus phylogeny, are good predictors of colonization.
Finally, I study how an optimally foraging granivore can promote (or undermine) coexistence amongst annual plants, using theory. Optimal foraging theory is one of the major theories for how predators behave; despite this, little is known about whether an optimally foraging predator could promote coexistence amongst a diverse community of prey. Previous models have shown than two species can coexist due to optimal foraging, but did not test whether multiple prey can coexist, nor if the effect is altered by environmental variation. Here, I show that if the predators specialize on different prey at different times, the predators can allow multiple prey species to coexist. In this case, environmental variation has little effect on the ability of predators to maintain diversity. If the predators are generalists, they cannot maintain diversity. Additionally, I show that generalist predators will create a negative storage effect, undermining coexistence.
Stump, Simon Maccracken. "Natural Enemies in a Variable World." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/560856.
Повний текст джерелаBogaerts, Márquez María 1991. "Identification of environmental variables in Drosophila melanogaster natural populations." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2022. http://hdl.handle.net/10803/673159.
Повний текст джерелаUnderstanding how species adapt to the environment is still an open question in Evolutionary Biology. While the focus has been on the genetic basis, the analysis of the environmental factors which drive these adaptive processes lags behind. Our main goal is to identify the main environmental variables that contribute to adaptation. We used natural D. melanogaster populations from Europe and North America, and analyzed both SNPs and transposable elements (TEs). To accurately detect and estimate TE population frequencies, we updated the T-lex algorithm and released a new version: T-lex3. We performed a Genome-Environment Analysis (GEA) to associate TEs and SNP allele frequencies with several environmental variables, and we identified temperature, rainfall and wind as the relevant variables involved in environmental adaptation. In addition, we found 10 TEs associated with an environmental variable. Finally, we developed a bioinformatic pipeline that integrates >200 D. melanogaster world-wide genomes, which will facilitate environmental analysis in space and time.
Gayral, Françoise. "Sémantique du langage naturel et profondeur variable : Une première approche." Paris 13, 1992. http://www.theses.fr/1992PA132004.
Повний текст джерелаYi, Jon Rong-Wei 1975. "Natural-sounding speech synthesis using variable-length units." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50438.
Повний текст джерелаIncludes bibliographical references (p. 112-115).
by Jon Rong-Wei Yi.
M.Eng.
Balendra, Padma Rani. "Deep vein thrombosis of the leg : natural history and haemostatic variables." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334477.
Повний текст джерелаIshizaki, Masato. "Mixed-initiative natural language dialogue with variable communicative modes." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/518.
Повний текст джерелаMcCartney, Ellen J. "Effect of contextual variables on mealtime problem behavior in the natural environment." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3593.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains v, 50 p. : ill. Includes abstract. Includes bibliographical references (p. 30-35).
Lane, Peter. "Simple synchrony networks : a new connectionist architecture applied to natural language parsing." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322386.
Повний текст джерелаDas, Dipanjan. "Semi-Supervised and Latent-Variable Models of Natural Language Semantics." Research Showcase @ CMU, 2012. http://repository.cmu.edu/dissertations/342.
Повний текст джерелаPrice, Zahrah. "An investigation of socioeconomic status (SES) as a variable affecting the nature of mother-infant interaction." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/2933.
Повний текст джерелаAzzabou, Noura. "Variable Bandwidth Image Models for Texture-Preserving Enhancement of Natural Images." Paris Est, 2008. http://pastel.paristech.org/4041/01/ThesisNouraAzzabou.pdf.
Повний текст джерелаThis thesis is devoted to image enhancement and texture preservation issues. This task involves an image model that describes the characteristics of the recovered signal. Such a model is based on the definition of the pixels interaction that is often characterized by two aspects (i) the photometric similarity between pixels (ii) the spatial distance between them that can be compared to a given scale. The first part of the thesis, introduces novel non-parametric image models towards more appropriate and adaptive image description using variable bandwidth approximations driven from a soft classification in the image. The second part introduces alternative means to model observations dependencies from geometric point of view. This is done through statistical modeling of co-occurrence between observations and the use of multiple hypotheses testing and particle filters. The last part is devoted to novel adaptive means for spatial bandwidth selection and more efficient tools to capture photometric relationships between observations. The thesis concludes with providing other application fields of the last technique towards proving its flexibility toward various problem requirements
Villarreal, Guerrero Federico. "Enhanced Greenhouse Cooling Strategy with Natural Ventilation and Variable Fogging Rates." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202717.
Повний текст джерелаKaneryd, Linda. "Dynamics of ecological communities in variable environments : local and spatial processes." Doctoral thesis, Linköpings universitet, Teoretisk Biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76165.
Повний текст джерелаLögdberg, Frida. "Population dynamics in variable environments – impacts of noise colour and synchrony." Doctoral thesis, Linköpings universitet, Teoretisk Biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72951.
Повний текст джерелаBinot, Aurélie. "La conservation de la nature en Afrique centrale entre théorie et pratiques. Des espaces protégés à géométrie variable." Phd thesis, Université Panthéon-Sorbonne - Paris I, 2010. http://tel.archives-ouvertes.fr/tel-00508990.
Повний текст джерелаBinot, Aurélie. "La conservation de la nature en Afrique centrale entre théories et pratiques : des espaces protégés à géométrie variable." Paris 1, 2010. https://tel.archives-ouvertes.fr/tel-00508990.
Повний текст джерелаLiu, Jingshu. "Unsupervised cross-lingual representation modeling for variable length phrases." Thesis, Nantes, 2020. http://www.theses.fr/2020NANT4009.
Повний текст джерелаSignificant advances have been achieved in bilingual word-level alignment from comparable corpora, yet the challenge remains for phrase-level alignment. Traditional methods to phrase alignment can only handle phrase of equal length, while word embedding based approaches learn phrase embeddings as individual vocabulary entries suffer from the data sparsity and cannot handle out of vocabulary phrases. Since bilingual alignment is a vector comparison task, phrase representation plays a key role. In this thesis, we study the approaches for unified phrase modeling and cross-lingual phrase alignment, ranging from co-occurrence models to most recent neural state-of-the-art approaches. We review supervised and unsupervised frameworks for modeling cross-lingual phrase representations. Two contributions are proposed in this work. First, a new architecture called tree-free recursive neural network (TF-RNN) for modeling phrases of variable length which, combined with a wrapped context prediction training objective, outperforms the state-of-the-art approaches on monolingual phrase synonymy task with only plain text training data. Second, for cross-lingual modeling, we propose to incorporate an architecture derived from TF-RNN in an encoder-decoder model with a pseudo back translation mechanism inspired by unsupervised neural machine translation. Our proposition improves significantly bilingual alignment of different length phrases
Pérez, Sáez Juan G. "Recruiting the Water Quality Trader: Do Socioeconomic Variables and Levels of Trust Matter?" The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397745413.
Повний текст джерелаWadie, Iain Hugh Charles. "Modelling of natural flexible variable structures for the automatic processing of meat carcasses." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336942.
Повний текст джерелаRichwine, Pebble Lea. "The Impact of Authentic Science Inquiry Experiences Studying Variable Stars on High School Students' Knowledge and Attitudes about Science and Astronomy and Beliefs Regarding the Nature of Science." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/194456.
Повний текст джерелаliu, xian. "PREDICTION OF NON-NATIVE INVASIVE PLANT SPECIES OCCURRENCES IN RELATION TO ENVIRONMENTAL VARIABLES IN SOUTHERN ILLINOIS." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1911.
Повний текст джерелаJohannesson, Karin. "Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land." Licentiate thesis, Linköping University, Linköping, Sweden, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-20140.
Повний текст джерелаJonas, Altouise Glowdean. "The influence of persons and marketing related variables on consumers purchasing of environmentally-friendly products." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1011098.
Повний текст джерелаVanrullen, Tristan. "Vers une analyse syntaxique à granularité variable." Phd thesis, Université de Provence - Aix-Marseille I, 2005. http://tel.archives-ouvertes.fr/tel-00142086.
Повний текст джерелаdans des applications de haut niveau. Nous présentons et évaluons ensuite plusieurs analyseurs syntaxiques dans ce formalisme, le dernier (SeedParser) étant destiné à mettre en oeuvre une véritable analyse à granularité variable. L'évaluation de ces outils est l'objet d'une étude approfondie. Enn, nous présentons quelques applications développées à l'aide de nos outils.
Souri, Davood. "Theoretical and Applied Essays on the Instrumental Variable Method." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/28765.
Повний текст джерелаPh. D.
Karoubi, Martine. "Système de raisonnement en langage naturel guidé par un raisonnement caricatural." Paris 11, 1986. http://www.theses.fr/1986PA112373.
Повний текст джерелаThe work presented here is our contribution to a question-answering system. The object of this work is twofold: First we present a new version of an answering strategy built around a natural language like representation. This system uses contextual production rules to build a reasoning tree which is the answer to the question. Among other technical features, we use "patterns of rules" to increase the performances of the pattern¬matching algorithm. In the second part we describe a mechanism for exploiting the results of a strategy called "caricature". We refine abstract caricatural reasoning paths in real fine-grain reasonings. We use the caricatural classes to choose "transparent rules" and we also compare phrases to detect the main differencies that have to be reduced
Cummings, Michael Alan. "Acculturation, Family Variables, and Cognition of a Subgroup of American Indian Children Ages 3-9." DigitalCommons@USU, 1997. https://digitalcommons.usu.edu/etd/6095.
Повний текст джерелаWilson, Robin M. "Influence of demographic variables on the likelihood of management plans for land trust properties." Muncie, Ind. : Ball State University, 2009. http://cardinalscholar.bsu.edu/678.
Повний текст джерелаCamacho, Mark A. "Depth analysis of Midway Atoll using Quickbird multi-spectral imaging over variable substrates." Thesis, Monterey California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2674.
Повний текст джерелаNdoye, Idrissa. "Isolement et approche synthétique de produits naturels issus du champignon endophyte Paraconiothyrium variabile." Paris 6, 2012. http://www.theses.fr/2012PA066314.
Повний текст джерелаParaconiothyrium variabile is an endophytic fungus isolated from the conifer Cephalotaxus harringtonia and displayed a significant antagonism against common plant pathogens. We undertook the chemical characterization of the fungal metabolites implied in the mutualistic relationship between the host plant and the endophyte in order to study their role in the observed antagonism. The analysis of the AcOEt extract of the culture filtrate of P. Variabile revealed four main families of metabolites: α-tetralones, isocoumarin, isobenzofuran, and a cyclodipeptide obtained in different culture conditions. The absolute configuration of three α-tetralones with a hydroxyl at C-4 was determined S by analysis of their circular dichroism spectra. The biotransformation of juglone and isosclerone led to increased amount of isosclerone and structural analogues, respectively. Dimerization of isosclerone under acidic conditions gave the best results towards the natural spirobisnaphtalene skeleton of palmarumycins. Additionally, a contribution to the synthesis of a biomimetic linear precursor of hirsutellones was done
Chidurala, Manohar. "A Numerical Study of Unsteady Natural Convection in a Rectangular Enclosure -- The Effect of Variable Thermodynamic and Transport Properties." ScholarWorks@UNO, 2009. http://scholarworks.uno.edu/td/973.
Повний текст джерелаSaid, Maryam Darwesh. "Epidemic cholera in KwaZulu-Natal the role of the natural and social environment /." Thesis, Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-12082006-124732.
Повний текст джерелаHolmqvist, Stephanie. "Comparison of Two Methods for Detecting Intrathecal Synthesis of Borrelia Specific Antibodies." Thesis, Linnaeus University, School of Natural Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-7868.
Повний текст джерелаIn Europe, Lyme disease is caused by the species Borrelia (B.) burgdorferi sensu stricto, B. garinii and B. afzelii. The disease is the most common vector-borne infection in Europe and the United States, and the resulting manifestation can involve the skin, nervous system, heart and joints. The symptoms that arise are associated with the Borrelia species causing the infection. The species most associated with neuroborreliosis is B. garinii whilst B. burgdorferi sensu stricto is associated with arthritis and B. afzelii is associated with dermatological symptoms. Lyme disease normally has three phases in untreated patients. The first phase is characterised by erythema migrans, a reddening of the skin around the area of the tick bite. If the disease develops to the second phase the patient will suffer from neuroborreliosis which is characterised by neurological symptoms such as headache and peripheral facial paralysis. Cerebrospinal fluid (CSF) analysis is used to diagnose neuroborreliosis. The diagnosis is complicated by variations between the different Borrelia species and that many healthy individuals have antibodies directed against Borrelia. Antibodies in CSF can be found in different diseases. The antibodies can be produced in the central nervous system or come across the blood-brain barrier and thus derive originally from the blood. By measuring the concentration of total albumin in serum and in CSF it can be determined if the antibodies present in the CSF have been produced in the central nervous system or if they originate from the blood. The typical manifestation in the last phase of Lyme disease is severe arthritis. The aim of this examination project was to compare two ELISAs for detection of antibodies directed to Borrelia. Indirect ELISAs from DAKO and Euroimmun were compared for the diagnosis of neuroborreliosis in 100 individuals. Borrelia specific antibodies of class IgM or IgG were found in 16 of 100 patients by DAKO’s ELISA and in 20 of the same 100 patients by Euroimmun’s ELISA. The reason that Euroimmun’s method detected more cases of neuroborreliosis is probably that this method detects antibodies directed to all three pathological species of Borrelia while DAKO’s method only detects antibodies directed to B. burgdorferi. In conclusion, this study indicates that Euroimmun’s method to detect antibodies of class IgM and IgG directed to Borrelia is superior to DAKO’s method. The obtained results were confirmed by Western blot analysis which gave results in accordance with those of Euroimmun’s ELISA.
Cayani, Banda Alexia Gabriela, and Gutiérrez Adriana Leofel Montenegro. "Principales variables que intervinieron en el desarrollo de la exportación de gas natural de camisea durante el periodo 2000 - 2018." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/651665.
Повний текст джерелаThis research paper seeks to analyze the main variables that intervened in the development of Camisea's natural gas exports during the period 2000 - 2018. For this, throughout the process, it was identified as essential to propose as a main objective, to know the relevance of the international market compared to the local market for the development of the Camisea gas export project during the period 2000 - 2018. The elaboration of the study was carried out based on the scientific method, and for its development, was applied the qualitative exploratory design of the case study type. On one hand, the steps for handling the primary information were, the search for epistemological antecedents in outstanding databases, bibliometric databases and databanks, all reliable and recognized sources; likewise, the research for theoretical bases that would support the subject of study; also, the detection of a problematic reality that would highlight the main and specific problems; in addition, the raising of valid arguments that would justify the investigation; and finally, the analysis of documents containing numerical information and statistical data of the sector under study. On the other hand, in order to obtain the primary information, eighteen semi-structured interviews were carried out with experts from eleven different companies, public and private, which are part of the Camisea project. To process this information, the Atlas. ti® software and the data triangulation technique were used, contrasting the background, the information contained in the theoretical framework and the result of the interviews. Finally, the main variables that intervened in the development of Camisea's natural gas exports during the period 2000 - 2018 were: the low domestic demand, the volume of proven reserves, the international price, the income from royalties, the investment in infrastructure, the technological development and the contractual framework. With the results of the study, we seek to contribute to future research that seeks to address the research topic, either from the same or another perspective.
Tesis
Dömeland, Narvaez Dörte. "Empirical studies on human capital and natural resources." Doctoral thesis, Universitat Pompeu Fabra, 2006. http://hdl.handle.net/10803/7345.
Повний текст джерелаThe first chapter of the thesis on "Empirical Studies on Human Capital and Institutions" presents estimates of returns to education in Germany and analyses the determinants of educational choices. The second chapter uses estimated returns to home country experience of US immigrants to provide empirical evidence that trade increases on-the-job human capital accumulation even in less developed countries, thereby resolving the theoretical ambiguity whether trade increases or decreases learning-by-doing. Similar to trade, GDP per capita, a high average level of educational attainment and stronger quality of policy and institutions are found to be positively associated with on-the-job human capital accumulation. The last chapter analyses the effect of natural resources and aid on institutions, providing empirical evidence that contrary to aid, mineral and fuel abundance tends to be associated with significantly lower quality of institutions if ethnic fractionalization is large.
Thomazini, Luís Fernando Viviani. "Estudo do comportamento da temperatura e da umidade relativa do ar no interior de um secador solar misto de ventilação natural." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-28092015-172717/.
Повний текст джерелаThe use of dryers to dehydrate agricultural products is appropriate to the needs of small farmers, because the dehydrated product has higher added value compared to the fresh ones, requires less storage space and lasts longer. It is necessary, however, offer to the small farmer economically viable equipment and, if possible, using natural and renewable energy sources , combining sustainability and economic growth. Therefore, the objectives were to study the behaviour of temperature and relative humidity inside a mixed-mode solar dryer with natural ventilation due to external weather conditions. And also the periods more or less favorable to the drying process, depending on the combination of meteorological variables. It was concluded that not always higher solar radiation results in higher temperature values inside the dryer. Cloudy and mainly rainy days may disturb the performance of the dryer, more than, for example, thermal losses due to the wind speed surrounding it. The data showed also that It was possible for the dryer to maintain its temperature higher than the outside temperature, predominantly between 06h and 18 h, while in the rest of the day the behaviour of temperature and relative humidity inside and outside of the equipment, resembles. Periods of high sunlight intensity and little rain are the most favorable to drying. However, winter months with little rain may present better performance than months situated near or in the summer but having cloudy and rain constantly.
Kossowska, Nicole. "Utvärdering av enterokockdiagnostik : Identifiering av vancomycin - variabla enterokocker." Thesis, Malmö universitet, Fakulteten för hälsa och samhälle (HS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-43741.
Повний текст джерелаThe Gram-positive bacteria Enterococci, belong to the normal intestinal flora in humans and in animals. In the following study, vancomycin-variable enterococci (VVE) are investigated. VVE is a vanA-positive bacteria, meaning that they are sensitive to vancomycin and can develop a resistance in vivo. Vancomycin-resistant enterococci (VRE) consists of two different species of bacteria, Enterococcus faecalis and Enterococcus faecium. Furthermore, VVE consists of E. faecium and can be difficult to detect with a culture-based diagnostic andcan therefore lead to the bacterium being underdiagnosed. This in turn means that the bacteria can be quietly spread within the hospital. VVE has a unique ability, it can transition from vancomycin-variables to having vancomycin-resistant phenotypes. Therefore, this study investigates at what vancomycin concentration the VVE broths can be enriched in the broths before the qPCR. The results show that the vancomycin concentration is optimal at 2 mg/L. However, for the background flora this might be a too high concentration.
Franco, Camila Manara. "Determinação de hidrocarbonetos majoritarios presentes no gas natural utilizando espectroscopia no infravermelho proximo e calibração multivariada." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250570.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
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Resumo: Através da Espectroscopia de Infravermelho Próximo (NIR), auxiliada por quimiometria, foram desenvolvidos modelos de calibração para determinar a concentração de hidrocarbonetos majoritários em misturas gasosas cujas concentrações são semelhantes a aquelas observadas em gás natural. Os espectros foram obtidos em dois diferentes espectrofotômetros NIR construídos no próprio laboratório, os quais empregavam células de caminho óptico fixo e variável. Diferentes conjuntos de amostras foram preparados de forma a reproduzir a variabilidade de concentração de metano, etano, propano e butano encontrada nas diversas fontes de gás natural. A análise de amostras certificadas, através dos modelos de calibração, apresentou valores para a raiz do erro médio quadrático de previsão (RMSEP) iguais a 1,07, 0,21, 0,22 e 0,14 % (v/v) na determinação de metano, etano, propano e butano, respectivamente. A previsão do gás metano apresentou melhor repetibilidade quanto realizada pela espectroscopia NIR do que com a técnica padrão, cromatografia gasosa. Visando a possibilidade da construção de um espectrofotômetro NIR dedicado à análise de gás natural foi realizado um estudo de seleção de variáveis, cujo resultado indicou que, utilizando até 13% do número inicial de variáveis (280) é possível realizar a previsão dos hidrocarbonetos gasosos sem perda da qualidade analítica quando comparado à análise que utiliza a faixa espectral completa. Por meio dos comprimentos de onda selecionados, pode-se prever a concentração de metano, etano, propano e butano com valores de RMSEP iguais a 1,32, 0,41, 0,22 e 0,14 % (v/v), respectivamente.
Abstract: Near Infrared (NIR) Spectroscopy and Chemometrics were used to construct calibration models to determine the concentration of major hydrocarbons in gas mixtures in concentrations similar to those observed in natural gas. The spectra were obtained by two different NIR spectrophotometers made in the laboratory, one employing a cell of fixed and other with variable optical path. Different sample sets were prepared in order to mimic the variability of methane, ethane, propane and butane concentration found in natural gas obtained from various sources. The analysis of certified samples made by using the calibration models showed Root-Mean-Square Errors of Prediction (RMSEP) equal to 1.07, 0.21, 0.22 and 0.14% (v/v) for methane, ethane, propane and butane determination, respectively. The prediction of methane gas content showed better repeatability compared to the standard technique based on gas chromatography. To investigate the possibility of constructing an NIR spectrometer dedicated to the analysis of natural gas, the selection of variables was evaluated. The results indicated that, by using up to 13% of the initial variables, the prediction of hydrocarbon gases is achieved with the same quality when compared to the results obtained using the full spectral range. Employing the selected wavelengths, it is possible to predict the concentration of methane, ethane, propane and butane with values of RMSEP equal to 1.32, 0.41, 0.22 and 0.14% (v / v), respectively.
Mestrado
Quimica Analitica
Mestre em Química
Braly, S. Katharine. "Environmental variables influencing sexual reproduction of sea oats, Uniola paniculata (Poaceae) across a natural dune field on Bear Island, North Carolina." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/r1/bralys/sbraly.pdf.
Повний текст джерелаGirard, Alexandre 1987. "Fast and strong lightweight robots based on variable gear ratio actuators and control algorithms leveraging the natural dynamics." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111689.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 191-196).
In many applications, robots have to bear large loads while moving slowly and also have to move quickly through the air with almost no load. These type of bi-modal tasks, with conflicting requirements in terms of operating speeds and desired impedances, often lead to the use of oversized and inefficient actuators which are inhibitory particularly for mobile robots. Multiple gear ratios, like in a powertrain, address this issue by allowing an effective use of power over a wide range of output speeds, by enabling significant changes to the reflected intrinsic actuator impedances and by making possible the leveraging or attenuation of the natural load dynamics. This thesis aims to develop the technological solutions needed to use variable gear ratio actuators and exploit the advantages of variable transmissions in a robotic context. First, by addressing the issue of how to make fast and seamless gearshifts between two very different reduction ratios under diverse load conditions, with a solution based on a dual-motor actuator architecture and a control scheme using the null space. Second, by developing control algorithms that select optimal gear ratios dynamically based on state feedback, to move with minimal motor torques and to adjust the output impedance appropriately given a task. The proposed approach exploit variable transmissions not merely for increasing maximum torque and speed, but also to significantly alter the dynamic properties, including load sensitivity, robustness, and backdrivability. Simulations and experiments using a novel lightweight robotic arm using three custom-built dual-speed dual-motor actuators are presented. Results demonstrate very fast gear shifting in highly dynamic situations with dual-speed dual-motor actuators, and show that actively changing gear ratios using the proposed control algorithms can lead to an order-of-magnitude reduction of necessary motor torque and power.
by Alexandre Girard.
Ph. D.
Agustini, José Antonio. "Extratos vegetais obtidos de espécies nativas do Cerrado brasileiro no controle do ácaro-rajado (Tetranychus urticae Koch) /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151887.
Повний текст джерелаResumo: O ácaro rajado, Tetranychus urticae Koch, é uma praga que ataca várias culturas em todo o mundo. Seu controle é feito basicamente por acaricidas químicos sintéticos. O uso inadequado de defensivos agrícolas, além de acarretar problemas ao meio ambiente, ao trabalhador e ao consumidor, pode levar ao desenvolvimento de populações de pragas resistentes aos seus princípios ativos. Extratos vegetais têm sido estudados na busca de novos princípios ativos que causem menos problemas ambientais, ocupacionais e de saúde humana, e que possam fazer parte de programa de manejo integrado de pragas e doenças. As florestas brasileiras são constituídas por uma grande diversidade de plantas que podem apresentar metabólitos secundários interessantes com propriedades biocidas. O objetivo deste estudo foi avaliar extratos aquosos e hidroetanólicos de folhas e cascas de doze espécies vegetais nativas do Cerrado brasileiro quanto à atividade acaricida e ao efeito sobre a fecundidade de fêmeas do ácaro-rajado, T. urticae. De cada espécie vegetal foram avaliados dois órgãos (folhas e cascas), duas épocas de coletas (primavera/verão e outono/inverno) além de dois tipos de solventes (água e etanol 70%). Os extratos foram aplicados por pulverização em torre de Potter, avaliando-se mortalidade, repelência e oviposição após 120 horas. Todas as doze espécies apresentaram atividade acaricida significativa sobre T. urticae, dependendo da época de coleta, do material vegetal e do solvente utilizado. Em nove e... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The two-spotted spider mite, Tetranychus urticae Koch, is a pest that attacks various crops throughout the world. The mites control is basically made by synthetic chemical acaricides. The inappropriate use of pesticides, besides causing problems to the environment, to the workers and the consumers, can lead to the development of populations of pests resistant to its active ingredient. Some pesticides such as neonicotinoids and pyrethroids have their origin in secondary plant metabolites such as tobacco and chrysanthemum, respectively. Plant extracts have been studied in the search for new active ingredients that cause less environmental, occupacional and human health problems, and that can be part of an integrated pest and disease management program. The Brazilian forests are constituted by a great plant diversity that can have interesting secondary metabolites with biocide properties. The objective of this study was to evaluate the mitecide activity of the aqueous and hydroethanolic extracts of leaves and bark of twelve native species from the Brazilian Cerrado and their effect on the fecundity of T. urticae mite females. Two plant organs (leaves and barks), two collection seasons (spring/summer and autumn/winter) were evaluated from each plant species, besides two types of solvents (70% ethanol and water). The extracts were applied by Potter tower spray, evaluating mortality, repellency and oviposition after 120 hours. All twelve species showed significant miticide activity... (Complete abstract click electronic access below)
Mestre
Derrington, Kathryn. "Comparative analysis of perceptions of metacognitive processes in traditional school leavers and mature age entry students in their first year of university education." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16443/1/Kathryn_Derrington_Thesis.pdf.
Повний текст джерела