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Vedanarayanan, Srinivasa Raghavan. "Agents of Influence in Social Networks". University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342464356.
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Gilani, Syed Zafar ul Hussan. "Understanding the behaviour and influence of automated social agents". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/279022.
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Online social networks (OSNs) have seen a remarkable rise in the presence of automated social agents, or social bots. Social bots are the new computing viral, that are surreptitious and clever. What facilitates the creation of social agents is the massive human user-base and business-supportive operating model of social networks. These automated agents are injected by agencies, brands, individuals, and corporations to serve their work and purpose; utilising them for news and emergency communication, marketing, social activism, political campaigning, and even spam and spreading malicious content. Their influence was recently substantiated by coordinated social hacking and computational political propaganda. The thesis of my dissertation argues that automated agents exercise a profound impact on OSNs that transforms into an array of influence on our society and systems. However, latent or veiled, these agents can be successfully detected through measurement, feature extraction and finely tuned supervised learning models. The various types of automated agents can be further unravelled through unsupervised machine learning and natural language processing, to formally inform the populace of their existence and impact.
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Melkersson, Kristina. "Influence of antipsychotic drugs on hormone levels /". Stockholm, 2000. http://diss.kib.ki.se/2000/91-628-4089-4/.
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Törnberg, Daniel C. F. "Exhaled nitric oxide : influence of mechanical ventilation and vasoactive agents /". Stockholm, 2004. http://diss.kib.ki.se/2004/91-7140-070-2/.
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DURAN, VICTOR HUGO BLANCO. "INFLUENCE OF STUBBORN AGENTS IN A MODEL OF OPINION FORMATION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23910@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Os modelos matemáticos de formação de opiniões vêm sendo estudados pelos físicos principalmente desde os anos 80 e atualmente fazem parte do novo ramo conhecido como Sociofísica. Esta área de pesquisa recente utiliza ferramentas e conceitos da física estatística e computacional. Os modelos deste tipo têm dado bons resultados para descrever certos aspectos do comportamento social e político, como a formação de opiniões, adoção de novas tecnologias ou atitudes extremas, que apresentam uma fenomenologia, a exemplo das transições ordem-desordem, análoga a alguns sistemas físicos. Dentro desse cenário, enquadra-se a presente dissertação, em que estudamos um modelo de formação de opiniões que pode ser associado a qualquer debate público com três opções (sim, não, indecisos). Consideramos uma população de indivíduos (ou agentes) totalmente conectados, que podem estar em três estados diferentes. As interações ocorrem aos pares e são competitivas, sendo negativas com probabilidade p ou positivas com probabilidade 1-p. Esta distribuição bimodal das interações produz um comportamento semelhante ao que resulta da introdução de contrários (no sentido de Galam) na população. Além disso, considera-se que uma certa fração d dos indivíduos são intransigentes ou obstinados, usualmente chamados de inflexíveis em dinâmica de opiniões, que conservam suas opiniões. Estudamos o impacto da concorrência entre contrários e inflexíveis sobre a opinião global, por meio de simulações computacionais. Os nossos resultados mostram que a presença de inflexíveis afeta o comportamento crítico da população só se tal desordem é temperada (em inglês quenched), ou seja, se os intransigentes não alteram as suas convicções com o tempo. Por outro lado, na versão recozida (em inglês annealed) do modelo, em que os inflexíveis são escolhidos em cada intervalo de tempo (isto é, a inflexibilidade é ocasional), a transição de fase de não-equilíbrio que ocorre na ausência de inflexveis permanece inalterada. Discutimos também a relevância do modelo para os sistemas sociais reais.
Mathematical models of opinion formation have been studied by physicists mainly since the 80s and are now part of the new branch known as Sociophysics. This recent area of research borrows tools and concepts from statistical physics. Models of this kind are providing good results to describe certain aspects of the social and political behavior, such as the formation of opinions, adoption of new technologies or extreme attitudes, that present a phenomenology, e.g., order-disorder transitions, analogous to some physical systems. Within this scenario, fits this thesis. We study a model of opinions that can be associated to any public debate with three options (yes, no, undecided). We consider a fully connected population of individuals (or agents), which can be in three different states. Interactions occur by pairs and are competitive, being negative with probability p or positive with probability 1-p. This bimodal distribution of interactions produces a behavior similar to that resulting from the introduction of contrarians (in the sense of Galam) in the population. Furthermore, we consider that a certain fraction d of individuals are intransigent or stubborn, usally called inflexibles in opinion dynamics. These individuals keep their opinions unchanged. By means of computer simulations, we study the impact of competition between contrarians and inflexibles on the formation of the majority opinion. Our results show that the presence of inflexibles affects the critical behavior of the population only if such condition is quenched, that is, if the intransigents not change their beliefs with time. On the other hand, in the annealed version of the model, where the inflexibles are chosen at each time interval (that is, stubborness is occasional), the nonequilibrium phase transition which occurs in the absence of inflexibles is not affected. We also discuss the relevance of the model to real social systems.
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Becerril, Diez Azucena. "Influence of chelating agents on proteolysis of micellar casein slurries". DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1635.
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ABSTRACT
Influence of chelating agents on proteolysis
of micellar casein slurries
Azucena Becerril Díez
The focus of this research was to analyze the effect of Ca chelators on the proteolytic activity of rennet during ripening of a micellar casein slurry. This research was divided in two phases. During the first phase, preliminary studies were performed to understand the behavior of rennet and the milk system in the presence of chelating agents. A solution of reconstituted skim milk at 10% (w/v) was prepared. Individual samples of this solution were divided in two study groups, samples with chelators and rennet and samples with only chelators. Two different chelators were used, sodium hexametaphosphate (SHMP or NaHMP) at concentration levels of 2.5 and 10 mM; and sodium citrate (SC) at concentration levels of 5 and 25 mM. These samples were incubated in a water bath at 32°C to measure coagulation time (CT) and Urea-PAGE electrophoresis was performed to identify presence of caseins and smaller peptides. For the second experiment, micellar casein slurries were prepared with a 25% protein content to simulate protein content in cheese. Samples were classified in two study groups, samples with chelators and rennet and samples with only chelators. Percentage of water soluble nitrogen analysis (%WSN) was performed following Kjeldahl procedures to measure the break down of caseins into free soluble nitrogen and Urea-PAGE electrophoresis was used to measure the appearance of smaller peptides due to protein break down. Bands with a higher density on electrophoretic gels were an indication of a higher concentration of peptides due to possible increased exposure of caseins to proteolysis. For the second phase, samples with the 2 most significant chelator levels were selected to add a protease and measure with the same tests if there was a higher rate of proteolysis. The data showed no particular trend or significant difference between treatments (p>0.05) for the %WSN test while some treatments showed a significant effect in samples treated for Urea-PAGE gels. In the Urea-PAGE analysis a different ANOVA was conducted on the percentage of alpha, beta, and gamma caseins for treatments before and after the incubation period separately and for the difference between both periods. These ANOVAs showed that the percentage difference in each casein before and after incubation was affected by the choice and level of chelator, and that these effects were modified by the presence or absence of rennet (p<0.001).
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Harte, Rachel A. "Influence of membrane environment and pharmacological agents on acyl CoA:cholesterol acyltransferase". Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386935.
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Huart, Pascal. "Influence de l'interaction lipides-agents antimiotiques sur l'activité des enzymes mitochondriaux". Doctoral thesis, Universite Libre de Bruxelles, 1990. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/213124.
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Roediger, Micah. "Evaluating the Impact of Training on the Effectiveness of Peer Change Agents: A Campus-wide Intervention". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/76820.
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The current study investigated the impact of a training program on a peer-to-peer intervention designed to increase the use of bicycle helmets on a large college campus. The training program was evaluated by the number of interactions a peer change agent--an individual who attempts to make a positive change in another person's behavior, had with bicyclists. The results suggest the training program may be effective in increasing change agent interactions for change agents who are already commitment to the intervention leading to more interactions per capita between committed trained change agents and bicyclists than untrained change agent and bicyclists. However, these results must be interpreted with caution due to small and unequal sample sizes.Master of Science
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Hardika, Ryan C. "Influence of chlorine concentration on the effectiveness of Cleaning-in-Place Agents". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587049313594841.
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Stoddard, James E. "The effect of group influence on organizational buying". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-03042009-041233/.
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Propper, David J. "The influence of immunosuppressive agents and pregnancy on sensitisation to major histocompatibility antigens". Thesis, University of Aberdeen, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358128.
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The studies in this thesis concern alloantibody responses against MHC class I antigens. These antibodies are induced by blood transfusions and strongly associated with clinical kidney allograft rejection. These findings were: 1. Cytotoxic antibodies in 11 multiparous patients, who had become broadly sensitised by blood transfusions, were of IgG class and directed to HLA class I antigens. In all patients, some of these antibodies were directed against class I specificities expressed by the partner by whom the patient was parous. 2. In high responder multiparous rats, humoral responses against paternal MHC class I antigens reencountered in blood transfusions given after pregnancy were suppressed. In contrast, minor histocompatibility antigens shared between the paternal and later blood donor strains enhanced anti-MHC class I antibody responses. 3. In multiparous rats, anti-paternal antibodies stimulated by pregnancy were not influenced by materno-paternal disparities at MHC class II or minor antigenic loci, and were directed to conventional MHC class I epitopes. 4. In high responder rats, there was no evidence for either humoral or cellular tolerance to non-inherited maternal MHC antigens. 5. In high responder rats pre-treated with blood transfusions and concomitant cyclosporin A, subsequent antibody responses to third party MHC class I antigens encountered in challenge transfusions, given without cyclosporin A, were suppressed only when minor histocompatibility antigens were shared between the initial and challenge transfusions. 6. Three drugs:- cyclosporin A, FK506 and rapamycin abrogated anti-MHC class I alloantibody responses to blood transfusions by naive rats and, at the same time, induced humoral tolerance. None of these drugs, however, inhibited either ongoing, alloantibody synthesis or humoral anamnestic responses in high responder rats with established humoral immunity.
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Georgilas, Athanasios-Panagiotis. "Animal proteins used as fining agents and their influence on the anthocyanins' profile". Master's thesis, ISA/UL, 2012. http://hdl.handle.net/10400.5/8610.
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Mestrado Vinifera EuroMaster - Instituto Superior de AgronomiaThe treatment of wine with fining agents is a common practice in the wine industry which aims to achieve wine’s clarity and improves its stability along the time. The objective of this work was to examine the influence of various animal proteins used as fining agents on the anthocyanins’ profile. For this experiment, two Portuguese varieties, Touriga Nacional and Trincadeira have been used in which two different concentrations have been applied for each fining product. The fining agents are commercial fining products widely used in the wine industry such as Egg Albumin, Isinglass, PVPP, Gelatin, Casesol. These proteins were added in the wines in order to perceive the effect of the adding protein and other fining agents on the wine’s anthocyanidins final composition, since that these monomeric anthocyanins have an important function on the sensory characteristics of wines, such as colour. The clarification process lasted 7 days for each fining product. At the end of each clarification period, monomeric anthocyanin analysis was carried out by HPLC. By the analysis in the HPLC, we perceived that in general the biggest impact from all the fining agents is displayed to the acylated and coumarylated derivatives of the monomeric anthocyanins rather than the 3-glucoside antocyanidins. Having this as a fact and learning through the initial analysis that Touriga Nacional is richer in these two groups rather than in glucoside derivatives we are able to explain why Touriga Nacional was more affected in all the fining treatments compared to Trincadeira that is poorer in acylated derivatives and in general it was less influenced by the fining agents. Moreover, further analysis have been carried out in order to examine the influence of the fining agents on the concentration of pigments, the quantity of condensed tannins as well as on the chromatic characteristics of the wine after fining. For the quantity of condensed tannins after fining, the results have shown that all the fining agents promoted a reduction on the final quantity of tannins after the treatments whereas for the pigments and colour intensity the impact was notably lower compared with the tannins. Regarding the impact on the colour anthocyanins, Casesol promoted the greatest influence on their quantity. In addition, the general tendency indicates that the fining products in high concentrations provoke a bigger decrease on the amount of total anthocyanins compared with the small concentrations
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Zhu, Tao. "Cultural influence on visitors' perceived service quality of a Chinese travel agency /". free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426121.
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Gothoskar, C. S. "The influence of particle size on sand-pack properties and drying profile". Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1533.
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Thesis (M.S.)--West Virginia University, 2000.Title from document title page. Document formatted into pages; contains xi, 65 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 63-65).
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Hart, Jonathan Michael. "The influence of biofilm on the antifungal activity of amine oxide". View the abstract Download the full-text PDF version, 2009. http://etd.utmem.edu/ABSTRACTS/2009-015-Hart-index.htm.
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Thesis (M.S.)--University of Tennessee Health Science Center, 2009.Title from title page screen (viewed on August 11, 2009). Research advisor: Jegdish P. Babu, Ph.D. Document formatted into pages (ix, 32 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 28-31).
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Rubil, Dijana, i Caroline Schöld. "The influence of and interaction between socialization agents in the child-consumers purchasing process". Thesis, Jönköping University, JIBS, EMM (Entrepreneurship, Marketing, Management), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-13096.
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In several years researchers have focused on identifying different socialization agents that influence the child consumer in the purchasing process. These studies have identified parents, friends and peers, television, role models, and different virtual communities as socialization agents. However, there is still no understanding of how the socialization agents are integrated in the decision-making process.
The purpose is therefore to identify how the child-consumers are influenced by different sources in their decision-making process, and recognise the socialization agents’ interaction as influencers.
The authors have found that there is a continuous interaction between the socialization agents in the decision-making process. The socialization agents, such as parents, siblings, friends and peers, television, role models and virtual communities, separately influence the adolescents in the purchasing process, however, the adolescents do not only take into consideration the opinion of one socialization agent but rather they use all of them. The authors have also found that the socialization agents act as support systems to other socialization agents, this in both influence and credibility.
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Jide-Akinwale, Efe. "Influence of socialisation agents on generation y students' apparel purchasing intentions / Efe Jide-Akinwale". Thesis, North-West University, 2013. http://hdl.handle.net/10394/10614.
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The global apparel market is an increasingly desirable industry sector for many marketers. The apparel retail industry in South Africa has experienced significant growth since the year 2000. In 2009, South Africans spent approximately R57 million on apparel items (Statistics South Africa, 2009). On average, South Africans spend R600 or more per month on apparel, making the apparel industry a very lucrative market. Consumer socialisation is the process by which the youth gain the necessary skills and knowledge that enable them to function as consumers in the marketplace. Consumer socialisation highlights the sources of consumer influences or ‘socialisation agents’ that transfer norms, develop attitudes, motivations and behaviour to the learner. Consumer attitudes, behaviour and skills are acquired through socialisation agents such as parents (father, mother and guardian), peers (brothers, sisters and friends) and the mass media (newspaper, television, radio, magazines) The Generation Y cohort (defined as individuals born between 1986 and 2005) is described as the largest and most profitable consumer group for marketers. Generation Y is a lucrative and growing market segment, particularly for apparel retailers. Apparel includes clothing, shoes, jewellery and cosmetics. Those Generation Y members engaged in tertiary education represent an especially important segment given that tertiary education often translates into higher future earning potential and a higher social status within a community and among peers. The primary objective of this research study was to investigate Generation Y students’ attitudes towards the influence of socialisation agents’ on apparel purchasing intentions in South Africa. The target population used in this research study was defined as full-time Generation Y undergraduate students, aged between 18-24 years, who were enrolled at public higher education institutions (HEIs) in South Africa in 2013. The sampling frame comprised the 23 registered South African public HEIs. A non-probability judgement sample method was used to narrow this sampling frame down to two HEI campuses situated in the Gauteng Province. For this study, a convenience sample of 500 full-time Generation Y students who were registered at these two South African HEI campuses during 2013 was drawn. A self-administered questionnaire was used for the collection of primary data for this research study. Academic staff at each of the two HEIs were contacted and asked if they would assist with the distribution of the survey questionnaire to students during class. The attitude towards the influence of socialisation agents on apparel purchasing intentions was measured based on peers, parents and the media. The outcomes from this research study suggest that Generation Y students do not perceive the influence of socialisation agents (peers/parents/media) as being particularly positive. While there was a significant positive relationship between their perceptions concerning the influence of peers, parents and media on apparel purchasing, none of these socialisation agents were perceived as having a significant influence on the Generation Y students’ monthly apparel spending. In terms of gender differences, males perceived the peer influence to be more important while females perceived the parent influence to be more important. There was no significant difference between males and females concerning the importance of the media influence on apparel purchasing. The analysis of statistical information gathered from this study will be relevant to both marketing practitioners and academia in understanding Generation Y consumers’ attitudes towards the influence of socialisation agents (peers/parents/media) in apparel purchasing intentions.MCom (Marketing Management), North-West University, Vaal Triangle Campus, 2014
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Higgins, J. A. "A study of the influence of cryoprotective agents on freeze-thaw damage to liposomes". Thesis, University of Brighton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371416.
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Lee, Yong Hoon. "Equine anaesthesia : influence of ancillary agents on intramuscular blood flow and other cardiopulmonary parameters". Thesis, Royal Veterinary College (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522628.
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Cossus, Louis. "Influence des agents phytopathogènes sur la production de lipopeptides et le protéome de Bacillus subtilis". Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69804.
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La bactérie Bacillus subtilis est considérée comme une solution alternative aux pesticides conventionnels pour la gestion des agents phytopathogènes. Les mécanismes de biocontrôle de cette bactérie sont multiples et reposent fortement sur la production de lipopeptides. A l'heure actuelle, l'influence des mycètes/oomycètes phytopathogènes sur la physiologie et les mécanismes de biocontrôle de B. subtilis est peu connue. L'objectif de ce projet de doctorat était d'étudier chez B. subtilis l'influence de différents mycètes/oomycètes phytopathogènes sur les mécanismes de biocontrôle et plus particulièrement sur la production de lipopeptides. Dans un premier temps, les lipopeptides produits par B. subtilis PTB185 ont été caractérisés par spectrométrie de masse et une méthode permettant leur quantification relative a été développée à l'aide d'un MALDI-TOF. Cette première étape a permis de montrer que la souche PTB185 produit de la surfactine, de l'iturine et de la fengycine. Les essais de confrontation sur gélose ont montré que l'activité antagoniste et la production de lipopeptides par B. subtilis variaient significativement (P ≤ 0.05) selon l'agent pathogène testé. Aucune corrélation entre la production de lipopeptides et l'activité antimicrobienne de B. subtilis n'a toutefois été observée. Le mycélium autoclavé des agents phytopathogènes a également influencé significativement les quantités de lipopeptides produites par B. subtilis en milieu liquide. La production de fengycine et/ou d'iturine a augmenté significativement en présence du mycélium de Botrytis cinerea, Mucor sp., Pythium ultimum ou Rhizoctonia solani, alors que l'addition de mycélium n'a pas affecté de façon significative la production de surfactine, en comparaison avec le traitement témoin. Les bactéries cultivées en milieu liquide en présence du mycélium de Mucor sp. ont causé une réduction significativement plus importante de la croissance de B. cinerea, R. solani et S. sclerotiorum, comparativement aux bactéries cultivées en absence de mycélium. Ces résultats montrent pour la première fois l'influence du mycélium autoclavé des agents phytopathogènes sur l'activité antagoniste et la production de fengycine/iturine chez B. subtilis. Une étude plus approfondie de l'influence du mycélium autoclavé et des composés extracellulaires des mycètes/oomycètes phytopathogènes sur B. subtilis PTB185 a par la suite été réalisée en protéomique. Le mycélium autoclavé de tous les agents phytopathogènes testés a fortement inhibé les protéines associées au métabolisme et à la biosynthèse de la thiamine chez la bactérie. Le mycélium autoclavé de Mucor sp. a fortement stimulé les protéines associées au « phage-like element PBSX » et fortement diminué celles du métabolisme et de la biosynthèse de la biotine. Les composés extracellulaires de P. ultimum ont diminué les protéines associées à la formation des flagelles et stimulé celles associées à la production de subtilosine. Le mycélium autoclavé et les composés extracellulaires de R. solani ont augmenté de façon importante les protéines associées à la synthèse de sidérophores. Les composés extracellulaires de S. sclerotiorum ont pour leur part très faiblement impacté le protéome de la bactérie. Les résultats de cette étude, en plus de témoigner de l'influence des interactions biotiques sur la production des lipopeptides, apportent des informations supplémentaires quant à l'influence de ces dernières sur la physiologie/les mécanismes de biocontrôle de B. subtilis. Enfin, cette étude offre de nouvelles perspectives pour optimiser le milieu de culture de B. subtilis à des fins biotechnologiques.The bacterium Bacillus subtilis is considered as a promising alternative to conventional pesticides for plant disease management. The mechanisms underlying the biocontrol properties of this bacterium are multiple and are closely related to the production of lipopeptides. Currently, little is known about the influence of plant pathogenic fungi/oomycetes on B. subtilis physiology and biocontrol mechanisms. The objective of this doctoral research project was to study the influence of fungi/oomycetes on B. subtilis biocontrol mechanisms, especially on the production of lipopeptides. In the first instance, the lipopeptides produced by B. subtilis PTB185 were characterised by mass spectrometry and a method allowing the relative quantification of these compounds was developed using MALDI-TOF instrumentation. This first step displayed the capacity of strain PTB185 to produce surfactin, iturin, and fengycin. Confrontation assays conducted on agar showed that B. subtilis antagonistic activity and production of lipopeptides vary significantly (P ≤ 0.05) according to the pathogen tested. However, no correlation between lipopeptides production and B. subtilis antimicrobial activity was observed. Autoclaved mycelia of plant pathogens were also shown to significantly influence the quantities of lipopeptides produced by B. subtilis in liquid culture. Fengycin and/or iturin were produced in significantly higher amounts in presence of mycelium of Botrytis cinerea, Mucor sp., Pythium ultimum, or Rhizoctonia solani, while addition of mycelium in the medium did not significantly affect surfactin production as compared to the control. Bacteria grown in liquid medium amended with Mucor sp. mycelium caused a significantly higher reduction of mycelial growth of B. cinerea, R. solani, and Sclerotinia sclerotiorum as compared to the bacteria grown with no mycelium. These results show for the first time the influence of autoclaved plant pathogen mycelium on B. subtilis antagonistic ability and production of fengycin/iturin. The influence of autoclaved mycelia and extracellular compounds of plant pathogenic fungi/oomycetes on B. subtilis was further investigated by proteomics. Autoclaved mycelium of all tested pathogens strongly inhibited the proteins associated with B. subtilis thiamine metabolism and biosynthesis. Autoclaved mycelium of Mucor sp. strongly increased proteins associated with the phage-like element PBSX and strongly decreased those related to biotin metabolism and biosynthesis. Extracellular compounds of P. ultimum reduced proteins associated with flagellar assembly and stimulated those related to the production of subtilosin. Autoclaved mycelium and extracellular compounds of R. solani strongly increased proteins associated with the production of siderophores. Extracellular compounds of S. sclerotiorum barely affected the proteome of the bacterium. The results of this study, besides providing additional evidence of the influence of biotic interactions on lipopeptides production, give further information on the influence of the latter on B. subtilis physiology and biocontrol mechanisms. Finally, this study provides new insights into the optimisation of the culture medium to grow B. subtilis for biotechnological applications.
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Wernick, David A. "Secondary Stakeholders as Agents of Influence: Three Essays on Political Risk, Reputation and Multinational Performance". FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/538.
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Organizational researchers have recently taken an interest in the ways in which social movements, non-governmental organizations (NGOs), and other secondary stakeholders attempt to influence corporate behavior. Scholars, however, have yet to carefully probe the link between secondary stakeholder legal action and target firm stock market performance. This is puzzling given the sharp rise in NGO-initiated civil lawsuits against corporations in recent years for alleged overseas human rights abuses and environmental misconduct. Furthermore, few studies have considered how such lawsuits impact a target firm’s intangible assets, namely its image and reputation. Structured in the form of three essays, this dissertation examined the antecedents and consequences of secondary stakeholder legal activism in both conceptual and empirical settings.
Essay One argued that conventional approaches to understanding political risk fail to account for the reputational risks to multinational enterprises (MNEs) posed by transnational networks of human rights NGOs employing litigation-based strategies. It offered a new framework for understanding this emerging challenge to multinational corporate activity. Essay Two empirically tested the relationship between the filing of human rights-related civil lawsuits and corporate stock market performance using an event study methodology and regression analysis. The statistical analysis performed showed that target firms experience a significant decline in share price upon filing and that both industry and nature of the lawsuit are significantly and negatively related to shareholder wealth. Essay Three drew upon social movement and social identity theories to develop and test a set of hypotheses on how secondary stakeholder groups select their targets for human rights-related civil lawsuits. The results of a logistic regression model offered support for the proposition that MNE targets are chosen based on both interest and identity factors. The results of these essays suggest that legal action initiated by secondary stakeholder groups is a new and salient threat to multinational business and that firms doing business in countries with weak political institutions should factor this into corporate planning and take steps to mitigate their exposure to such risks.
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Li, Ching-lu. "The influence of aluminium on enzymes in the rat brain with special reference to those involved in polyanine biosynthesis". [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12368040.
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Wiegand, Douglas Michael. "Exploring Personality Traits and Susceptibility to Social Influence in Student Change-Agents: Implications for Participation in a Campus-Wide Safety Initiative". Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29746.
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This study explored the impact of commitment tactics and individual differences in personality on change-agent participation in a peer-to-peer intervention. The intervention involved approaching bicyclists on campus, discussing the importance of helmet use, and rewarding them with a coupon for a discounted helmet if they signed a promise to wear one.
Change-agent volunteers (n = 82) were trained in one of three commitment conditions to explore their relative impact on approaching a set number of bicyclists. Specifically, change-agents were asked to commit to a personal goal of number of targets they would approach in private, in public to a small group of people, or in public to a large group of people. In addition, change-agents completed measures of the "Big Five" personality traits and susceptibility to social influence tactics to explore their potential influence on intervention performance variables.
No statistically significant differences were found in goal attainment between the commitment conditions. However, 10% more of the change-agents making a public, group commitment met their goal when compared to those who made an individual, private commitment. No significant relation was found between the Big Five personality traits and the number of bicyclist targets approached. However, the Big Five predicted 19% of the variance in the rate of obtaining signed promise cards from bicyclists.
Of the susceptibility to social influence variables, only the Ingratiation score was shown to be useful for predicting change-agent effort, accounting for 18% of the variance in the number of targets approached.
The peer-to-peer intervention was not successful in increasing bicycle helmet use on campus. Limitations of the intervention in comparison to a successful helmet program are discussed.Ph. D.
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Schneider, Amber N. Hafertepe Kenneth. "More than meets the eye the use of exhibitions as agents of propaganda during the inter-war period /". Waco, Tex. : Baylor University, 2009. http://hdl.handle.net/2104/5309.
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Esbjörnsson, Jimmy. "EMO - A Computational Emotional State Module : Emotions and their influence on the behaviour of autonomous agents". Thesis, Linköping University, Department of Science and Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9090.
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Artificial intelligence (AI) is already a fundamental component of computer games. In this context is emotions a growing part in simulating real life. The proposed emotional state module, provides a way for the game agents to select an action in real-time virtual environments. The modules function has been tested with the open-source strategy game ORTS. This thesis proposes a new approach for the design of an interacting network, similar to a spreading activation system, of emotional states that keeps track of emotion intensities changing and interacting over time. The network of emotions can represent any number of persisting states, such as moods, emotions and drives. Any emotional signal can affect every state positively or negatively. The states' response to emotional signals are influenced by the other states represented in the network. The network is contained within an emotional state module. This interactions between emotions are not the focus of much research, neither is the representation model. The focus tend to be on the mechanisms eliciting emotions and on how to express the emotions.
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Passos, Vanara FlorÃncio. "Influence of protective agents to prevent intrinsic or extrinsic erosion: in vitro and in situ studies". Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9608.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoConsidering the decline in the prevalence of caries and periodontal diseases in society, there is greater tooth longevity. Thus, non-carious cervical lesions have been observed with greater frequency. Therefore, products that enable the reduction of tooth wear, with easy access and daily use, are ideal alternatives for reducing the loss of mineralized tissue. This thesis consists of three papers that aim, respectively: (1) verify the preventive effect of three commercial AmF, AmF/SnF2 or SnF2-containing dentifrices through an erosive/abrasive model on human dentin; (2) investigate the effect of Mg(OH)2 present in commercial dentifrices in preventing the erosion of enamel by extrinsic and intrinsic acids, as well as, the influence of the number of experimental days in erosion progression; (3) evaluate in situ the action of Mg(OH)2 and NaF in prevention of intrinsic erosion on human enamel. In Articles 1 and 2, were conducted in vitro models, randomized, blind, cyclic, in which the specimens were subjected to the process of de- and remineralization. In Article 1, the erosion was simulated by intrinsic acid, while in Article 2, was intrinsic and extrinsic acids. In Article 1, was added the process of abrasion for toothbrushing. For both studies, the cycle was repeated three times daily for 5 days. In Article 3, the study was in situ, randomized, double-blind, crossover in three phases of five days each, with the participation of 18 volunteers who wore palatal appliances containing 2 blocks of human enamel treated with different toothpastes: control (0 ppm F), Mg(OH)2 (2%) and NaF (1450 ppm F). The specimens were subjected to erosion by immersion them in a cup containing 0.01 M hydrochloric acid (pH = 2) for 60 seconds, 4 times a day, in predetermined times. Then, the volunteers brushed their teeth for 25 seconds with the device in the mouth, and the dilution dentifrice/saliva was rinsed mouthwash for 60 seconds. The alterations caused in specimens of all articles were evaluated by hardness and/or stylus profilometry. Data were tested using ANOVA (p <0.05). The Tukey test was used when required, in cases in which ANOVA revealed difference statistically significant. The results showed that in the article 1, AmF/SnF2 or SnF2 significantly reduced (p <0.05) the loss of dentin surface after erosion/abrasion. In Article 2, Mg(OH)2 or NaF-containing dentifrices were effective in reducing demineralisation caused by citric acid 0.05 M (p <0.001) compared to control. However, none prevention was observed for simulation of intrinsic acid, for both products. The results of the article 3 showed that tested dentifrices reduced the loss of surface enamel (p = 0.021). However, these products not present remineralizing effects (p = 0.349). Thus, it is concluded that dentifrices containing stannous fluoride or magnesium hydroxide are effective in performing some protective effect on the dental substrate after action of acids exogenous or endogenous.
Considerando o declÃnio da prevalÃncia da doenÃa cÃrie e periodontal na sociedade, observa-se uma maior longevidade dentÃria. Assim, lesÃes cervicais nÃo-cariosas tÃm sido observadas com maior freqÃÃncia. Portanto, produtos que possibilitem a reduÃÃo do desgaste dentÃrio, sendo de fÃcil acesso e de uso diÃrio, sÃo alternativas ideais para a reduÃÃo da perda de tecido mineralizado. Dessa forma, esta tese à constituÃda por trÃs artigos que objetivaram, respectivamente: (1) verificar o efeito preventivo de trÃs pastas comerciais contendo AmF, AmF/SnF2 or SnF2 atravÃs de um modelo erosivo/abrasivo em dentina humana; (2) investigar o efeito do Mg(OH)2 presente em dentifrÃcios comercializados na prevenÃÃo do processo erosivo no esmalte por Ãcidos extrÃnseco ou intrÃnseco, bem como, a influÃncia do nÃmero de dias experimentais na progressÃo da erosÃo; (3) avaliar in situ a aÃÃo do Mg(OH)2 e NaF na prevenÃÃo da erosÃo por Ãcidos de origem intrÃnseca em esmalte humano. Nos artigos 1 e 2, foram realizados modelos in vitro, cÃclico, randomizado, cego, no qual os espÃcimes foram submetidos a processo de des- e remineralizaÃÃo. No artigo 1, foi simulado processo erosivo por Ãcido de origem intrÃnseca, enquanto no artigo 2, foi avaliada erosÃo por Ãcido de origem intrÃnseca e extrÃnseca. No artigo 1, foi acrescentado o processo abrasivo atravÃs da escovaÃÃo. Para ambos os estudos, o ciclo foi repetido trÃs vezes ao dia durante cinco dias. No artigo 3, foi realizado um estudo in situ, randomizado, duplo-cego, cruzado, em trÃs fases de 5 dias cada, com a participaÃÃo de 18 voluntÃrios, que utilizaram dispositivos palatinos, contendo 2 blocos de esmalte dentÃrio humano tratados com diferentes dentifrÃcios: controle (0 ppm F), Mg(OH)2 (2%) e NaF (1450 ppm F). Os espÃcimes foram submetidos à erosÃo por imersÃo do dispositivo em um copo contendo HCl 0,01 M (pH=2) por 60 segundos, 4 vezes ao dia, em horÃrios prÃ-determinados. Em seguida, os voluntÃrios escovaram seus dentes por 25 segundos e, com o dispositivo na boca, bochecharam a suspensÃo dentifrÃcio/saliva formada por 60 segundos. As alteraÃÃes ocasionadas nos espÃcimes de todos os artigos foram avaliadas por testes de dureza e/ou perfilometria mecÃnica. Os dados obtidos foram testados usando ANOVA (p< 0,05). O teste de Tukey foi aplicado, quando necessÃrio, em casos no qual ANOVA revelou diferenÃa estatÃstica. Os resultados do artigo 1 mostraram que dentifrÃcios contendo AmF/SnF2 ou SnF2 reduziram significativamente (p<0,05) a perda de superfÃcie dentinÃria apÃs o processo erosivo/abrasivo. No artigo 2, dentifrÃcios contendo Mg(OH)2 ou NaF foram efetivos em reduzir a desmineralizaÃÃo ocasionada por Ãcido cÃtrico 0,05 M (p<0,001) comparados ao grupo controle. Entretanto, para simulaÃÃo de erosÃo por origem intrÃnseca nÃo houve prevenÃÃo para ambos os produtos. Os resultados do artigo 3 demonstraram que houve efeito dos dentifrÃcios testados na reduÃÃo da perda de superfÃcie de esmalte (p = 0,021). Entretanto, os mesmos nÃo evidenciaram efeitos na reduÃÃo da desmineralizaÃÃo (p = 0,349). Dessa forma, conclui-se que dentifrÃcios contendo fluoreto estanhoso ou hidrÃxido de magnÃsio sÃo efetivos em realizar algum efeito protetor no substrato dentÃrio apÃs aÃÃo de Ãcidos de origem exÃgena ou endÃgena.
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Highley, Thomas A. "Agents of Influence: A Metaphor Analysis of Middle Level Students’ and Teachers’ Conceptualizations Surrounding Blended Learning". University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535702776334066.
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Njuguna, Rebecca Wanjiku. "Investigating Factors that Influence Compliance of Digital Financial Service Agents to Legislation and Standards in Kenya". Master's thesis, Faculty of Commerce, 2021. http://hdl.handle.net/11427/33914.
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This study investigated the factors that influence compliance with existing legislation and standards among digital financial services (DFS) agents in Kenya. DFS in Kenya serve 60% of the adult population with at least 16 million subscribers. Much of these are attributable to the mobile money service Mpesa which accounts for the largest DFS market share. The number of DFS agents serving the market has grown to over five times the number of bank branches and ATMs in the country. With this growth in DFS, there have been many operational challenges among agents and the legislation has been at nascent. The aim of the study was to understand agent operational factors and how they influence compliance. Therefore, the main research question that guided the study was “How do operational factors affect compliance of DFS agents with agency banking legislation and standards in Kenya?” Additionally, the study investigated the compliance status among agents and identifiable groupings by compliance behaviour. Previous studies on DFS agents have identified persistent operational challenges but there has been no inquiry on how existing legislation addresses these challenges and whether their persistence is due to non-compliance. To investigate compliance, first, Configuration Theory (CT) was used to conceptualise DFS agents as organisations, classifying their operations under CT's principles of structure, strategy and environment. Subsequently, a conceptual model was developed with structure, strategy and environment as independent variables and compliance as the dependent variable. The first three propositions derived stated that structure, strategy and environment have an influence on compliance. The fourth proposition posed was that strategy has a greater influence on compliance than structure and environment. Quantitative paper-based questionnaires were used to collect cross-sectional data from 450 DFS agents in Kenya. A Partial Least Squares approach to Structural Equation Modelling (PLS-SEM) was applied to analyse the data on Smart PLS3. All four propositions were confirmed. Structure, strategy and environment had highly significant effects on compliance and strategy had the strongest effect on compliance. The findings suggest that Strategy, which was measured using training and technology utilization questionnaire items plays the biggest role in an agent's operations and compliance. Training equips agents with skills to manage liquidity, offer quality customer service, perform Know-Your-Customer (KYC), CustomerDue-Diligence (CDD) and suspicious transaction reporting (STR) procedures to assist with fraud detection and anti-money-laundering (AML) by identifying counterfeit customer identification documents, cash, and suspicious behaviour. Technologies such as CCTV cameras, counterfeit cash detectors and cash counting machines not only enhance efficiency but support the enforcement of the fraud and AML procedures. A two-step cluster analysis was performed to classify agents by compliance behaviour. Two distinct clusters emerged. The cluster where majority of agents fell exhibited better training and awareness of existing legislation, higher education levels and financial resources and was compliant with most of the questionnaire items measured. The second cluster with fewer agents was uncompliant on most questionnaire items measured and was characterised by lower education levels, financial resources and training levels. There were commonalities in both clusters which were relatively low scores on legislation awareness, and low compliance scores on liquidity and possession of DFS agent operational manuals. These findings suggest that an agent with a good alignment of financial and human resources (structure), good training and technology (strategy) and well informed about existing legislation (environment) would be compliant and is likely to experience less operational challenges. The findings also provide insights on what areas agents can take initiative for their own development, the most important being liquidity management, technology optimization and educating themselves on what legislations apply to them, and their compliance roles and responsibilities. Lastly, the study provides regulators with exploratory findings on the state of compliance among DFS agents in Kenya, indicating which areas agents are having most difficulty with. Banks and MNOs must recognize the crucial role of training and tailor programs to be responsive to all agent's operational and legislative areas.
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Karagunduz, Ahmet. "Influence of surfactants on the sorption and transport of contaminants in saturated and unsatruated soils". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20745.
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ívarsson, Óli. "Improved Combat Tactics of AI Agents in Real-Time Strategy Games Using Qualitative Spatial Reasoning". Thesis, University of Skövde, School of Humanities and Informatics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-956.
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Real-time strategy (RTS) games constitute one of the largest game genres today and have done so for the past decade. A central feature of real-time strategy games is opponent AI which is suggestively the “last frontier” of game development because the focus of research has primarily been on other components, graphics in particular. This has led to AI research being largely ignored within the commercial game industry but several methods have recently been suggested for improving the strategic ability of AI agents in real-time strategy games.
The aim of this project is to evaluate how a method called qualitative spatial reasoning can improve AI on a tactical level in a selected RTS game. An implementation of an AI agent that uses qualitative spatial reasoning has been obtained and an evaluation of its performance in an RTS game example monitored and analysed.
The study has shown that qualitative spatial reasoning affects AI agent’s behaviour significantly and indicates that it can be used to deduce a rule-base that increases the unpredictability and performance of the agent.
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Hassan, Saad A. "Influence of Cholesterol Import on Aspergillus fumigatus Growth and Antifungal Suscepibility". Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc5539/.
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Invasive pulmonary aspergillosis is a life-threatening fungal infection commonly observed in immunocompromised patients and has a mortality rate approaching 100% once the disease is disseminated. Aspergillus fumigatus is the most common pathogen. Early diagnosis improves the prognosis but is very difficult since most signs and symptoms are nonspecific. Antifungal therapy, usually based on sterol biosynthesis inhibitors, is also of limited efficacy. In my attempts to discover a diagnostic sterol marker for aspergillosis, I observed that A. fumigatus incorporates large amounts of cholesterol from serum-containing medium. This observation suggested the hypothesis that exogenous cholesterol from the host can be imported by A. fumigatus and used as a substitute for ergosterol in the cell membrane. This proposed mechanism would reduce the efficacy of antifungal drugs that act as sterol biosynthesis inhibitors. Experiments to test this hypothesis were designed to determine the effects of serum-free and serum-containing medium on growth of A. fumigatus in the presence and absence of azole antifungal agents. The results showed a marked increase in growth in the presence of human serum. Cultures in media containing cholesterol but no serum also showed enhanced growth, a result indicating that a non-cholesterol component of serum is not primarily responsible for the increased growth. However, sterol analysis of A. fumigatus cultured in the absence of inhibitors showed little or no change in ergosterol levels. This result suggested that the imported cholesterol was not being used as membrane sterol. However, in parallel experiments using Itraconazole, an antifungal agent that attenuates sterol biosynthesis by inhibiting the sterol 14a-demethylase (ERG11), ergosterol levels decreased with increasing doses of inhibitor. Moreover, serum-containing medium partially rescued A. fumigatus from the effects of Itraconazole, and a similar rescue effect was observed with serum-free media containing cholesterol. From the preceding results, it can be concluded that human serum enhances A. fumigatus growth, that cholesterol import rescues Aspergillus from the effects of antifungal agents, that the potency of some azole antifungals is decreased by cholesterol, and that imported cholesterol may substitute for membrane ergosterol in the presence of sterol biosynthesis inhibitors.
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Hot, Julie, i Julie Hot. "Influence des polymères de type superplastifiants et agents entraineurs d'air sur la viscosité macroscopique des matériaux cimentaires". Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00962408.
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Depuis quelques années, le béton connait une période de mutation. Les tendances actuelles concernant la formulation des bétons à hautes performances et à faibles impacts environnementaux montrent que la fraction volumique solide est de plus en plus élevée. Cette augmentation de la fraction volumique solide est cependant difficilement compatible avec une fluidité importante. La thèse présentée ici a donc pour but de proposer des solutions permettant de contourner le problème de viscosité des ces nouveaux bétons. Nous nous attachons ainsi à identifier les mécanismes d'action de certains polymères à l'origine d'une diminution de la viscosité macroscopique de pâtes de ciment concentrées. Les polymères que nous étudions appartiennent à deux familles différentes : les super plastifiants et les agents entraîneurs d'air. Alors que le chapitre 1 a pour objectif d'expliquer le contexte actuel et de justifier l'intérêt des recherches menées durant cette thèse, le chapitre 2 présente les procédures expérimentales utilisées. Nous proposons des protocoles permettant de faire la distinction entre les effets des polymères étudiés sur la contrainte seuil et leurs effets sur l'autre paramètre du comportement :la viscosité. Dans le chapitre 3, nous mettons en évidence certains mécanismes d'action des polymères adsorbants de type super plastifiants. Nous observons que deux polymères peuvent avoir un effet différent sur la dissipation visqueuse d'une pâte de ciment pour une contrainte seuil donnée. Nous suggérons alors que les molécules de polymère adsorbé modifient l'état de floculation du système, et donc la façon dont le cisaillement se concentre entre les grains. Dans le même temps, les molécules de polymère non adsorbé modifient la viscosité du fluide interstitiel. La viscosité macroscopique résulte alors de la compétition entre ces deux mécanismes. Dans le chapitre 4, nous nous intéressons aux effets des agents entraîneurs d'air. Grâce à des mesures sur pâtes de ciment et mortiers, nous montrons que, suivant la consistance du système étudié, l'entraînement d'air peut diminuer ou non la viscosité. Nous suggérons qu'un tel comportement trouve son origine dans la compétition entre la tension de surface qui tend à empêcher la déformation des bulles et la consistance du système en écoulement qui tend à les déforme
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Kemble, Rebecca Jane Thornley. "Antioxidants and natural anti-cancer agents in the large bowel and the influence of intestinal microbial fermentation". Thesis, Robert Gordon University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311796.
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Steinbach, Gregory C. "Vascular imaging with ultrasound contrast agents : characterization of pharmaceutical, physiological, and instrumentation parameters that influence clinical efficacy /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9944212.
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Lejus-Bourdeau, Corinne. "Métabolisme des agents anesthésiques et cytochromes P450 3A4, 1A2 et 2E1 : influence de l'âge et interactions médicamenteuses". Rennes 1, 2002. http://www.theses.fr/2002REN1B065.
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Objectifs : évaluer l'intérêt des cultures primaires d'hépatocytes pour l'étude de l'inhibition du CYP3A4 par le propofol, déterminer son effet sur les CYP1A2 et 2E1, rôle du CYP2E1 dans la potentialisation du mivacurium. L'inhibition du CYP3A4 est variable selon le modèle et le substrat. La faible intensité de l'inhibition sur les hépatocytes est liée à l'absorption du propofol sur le support de culture. Une inhibition compétitive du CYP2E1, (hydroxylation de la chlorzoxazone) est observée sur les microsomes humains (Ki 48æM) et porcins (Ki 19æM) avec une altération prédite de 23-43 % de la clairance d'élimination hépatique de la chlorzoxazone pour 17-45æM de propofol. Le propofol exerce une inhibition mixte sur le CYP1A2 (dééthylation de l'éthoxyrésorufine) sur les hépatocytes humains (Ki 80æM, Kies 53æM)) et la protéine recombinante (Ki 175æM, Kies 26æM) ainsi qu'une inhibition incompétitive sur les microsomes ( Kies 42æM) et les hépatocytes (40æM) porcins. L'inhibition des CYP1A2 et 3A4 suggère une altération du métabolisme des agents co-administrés et celle du CYP2E1, une protection contre la toxicité de l'halothane et du paracétamol. Le métabolisme du sévoflurane quantifié à l'aide des fluorures urinaires est lié à l'âge par une relation allométrique, confirmant l'ontogenèse du CYP2E1. La baisse de l'activité cholinestérase durant l'inhibition de sévoflurane, due à l'hémodilution, ne peut expliquer la durée d'action accrue du mivacurium.
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Hot, Julie. "Influence des polymères de type superplastifiants et agents entraineurs d'air sur la viscosité macroscopique des matériaux cimentaires". Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1114/document.
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Depuis quelques années, le béton connait une période de mutation. Les tendances actuelles concernant la formulation des bétons à hautes performances et à faibles impacts environnementaux montrent que la fraction volumique solide est de plus en plus élevée. Cette augmentation de la fraction volumique solide est cependant difficilement compatible avec une fluidité importante. La thèse présentée ici a donc pour but de proposer des solutions permettant de contourner le problème de viscosité des ces nouveaux bétons. Nous nous attachons ainsi à identifier les mécanismes d'action de certains polymères à l'origine d'une diminution de la viscosité macroscopique de pâtes de ciment concentrées. Les polymères que nous étudions appartiennent à deux familles différentes : les super plastifiants et les agents entraîneurs d'air. Alors que le chapitre 1 a pour objectif d'expliquer le contexte actuel et de justifier l'intérêt des recherches menées durant cette thèse, le chapitre 2 présente les procédures expérimentales utilisées. Nous proposons des protocoles permettant de faire la distinction entre les effets des polymères étudiés sur la contrainte seuil et leurs effets sur l'autre paramètre du comportement :la viscosité. Dans le chapitre 3, nous mettons en évidence certains mécanismes d'action des polymères adsorbants de type super plastifiants. Nous observons que deux polymères peuvent avoir un effet différent sur la dissipation visqueuse d'une pâte de ciment pour une contrainte seuil donnée. Nous suggérons alors que les molécules de polymère adsorbé modifient l'état de floculation du système, et donc la façon dont le cisaillement se concentre entre les grains. Dans le même temps, les molécules de polymère non adsorbé modifient la viscosité du fluide interstitiel. La viscosité macroscopique résulte alors de la compétition entre ces deux mécanismes. Dans le chapitre 4, nous nous intéressons aux effets des agents entraîneurs d'air. Grâce à des mesures sur pâtes de ciment et mortiers, nous montrons que, suivant la consistance du système étudié, l'entraînement d'air peut diminuer ou non la viscosité. Nous suggérons qu'un tel comportement trouve son origine dans la compétition entre la tension de surface qui tend à empêcher la déformation des bulles et la consistance du système en écoulement qui tend à les déformeThe concrete industry has been undergoing significant change in recent years. Current trends in mix design of high strength and environmentally friendly concretes show that solid volume fraction is progressively increasing. This increase in solid volume fraction is however not compatible with an adequate fluidity. The aim of the work presented here is thus to bring solutions to the high viscosity of these new concretes. We try to identify potential mechanisms of action of some polymers at the origin of a decrease in the macroscopic viscosity of concentrated cement pastes. We focus here on two types of polymers: super plasticizers and air entraining agents. In a first chapter, we explain the current economic, social and industrial situation and justify the need of the research work presented here. In a second chapter, we show the importance of the experimental procedure. We suggest protocols from which the effects of tested polymers on the viscosity parameter can be distinguished from the effects on yield stress. In a third chapter, we show some potential mechanisms of action of adsorbing polymers as super plasticizers. We observe that for the same effect on yield stress, viscous dissipation of cement pastes can be different for the two tested polymers. We suggest that adsorbed polymer molecules modify the flocculation state of the system and thus the way shear concentrates between cement grains. In the same time, non adsorbed polymer molecules modify the viscosity of the interstitial fluid. Therefore, the macroscopic viscosity results from the competition of the two above phenomena. In the fourth chapter, we are interested in the effects of air entraining agents. Thanks to experimental measurements on cement pastes and mortars, we show that according to the system consistency, air entrainment can increase or decrease viscosity. We suggest that such a behaviour finds its origin in the competition between surface tension, which tends to prevent air bubble deformation and the system consistency, which tends to deform the same air bubbles
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Lee, Young Eun. "Investigating consumers' use of product recommendation agents: understanding the influence of product type and in-store context". Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31381.
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Product Recommendation Agents (RAs) are web-based software systems that
advise consumers about what to buy based on the needs expressed by those consumers.
Most research on RAs has focused on evaluating the different algorithms that generate
recommendations, while the effectiveness of RAs is determined by many factors beyond
design of algorithms.
This dissertation focuses on two important but understudied factors, namely, the
influences of product type and in-store context. These factors were investigated in two
separate laboratory experiments: Study 1 and Study 2. Study 1 examined the influence
products with high emotional contents on consumers' use of RAs. Such products are
characterized by attribute conflicts which involve the correlation of the favourable values
of some attributes with the unfavourable values of others. Two RAs - one that highlights
attribute conflicts and one that presents them implicitly - were developed and compared.
The experiment results show that the RA highlighting attribute conflicts negatively
influences consumers' perceptions and acceptance of RAs, as compared to the RA
obscuring the conflicts. In addition, task emotionality - the degree to which a decision
task is perceived to bring severe negative consequences - moderates such relationships.
Study 2 examined the influence of in-store contexts on consumers' use of RAs. The
in-store context has become important with the advent of mobile RAs operated on
handheld devices, such as Personal Digital Assistants. In the in-store context,
compatibility between the way the store displays the products and the way RAs guides
consumers' decision making is an important predictor of decision performance. Two RAs
which guide consumers' decisions in two different manners - alternative-driven and
attribute-driven ways - were contrasted. Due to a limit to displaying complex products
sorted by every attribute on product shelves, products are displayed randomly by alternative in a store. Therefore, the alternative-driven RA is more compatible with the
store's product displays than attribute-driven RA. The experiment results show that
compatibility increases both accuracy of decisions and perceived control. In addition,
mobile RA use, as compared to RA non-use, decreases consumers' perceived effort and
increases their intentions to return to the store.Business, Sauder School of
Graduate
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Le, Roux Ignus. "The influence of online travel agent performance on customer satisfaction levels at a selected hotel". Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/3105.
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Tourism is an international industry; constant evolution is taking place in the marketing of tourism products and the expectation levels of hotel guests. Online Travel Agents have become more dominant in recent years. This dominance has been assisted by travellers’ more frequent use of the internet to search for information, by the bundling of heterogeneous products and by these agents’ use of the social media. Guest satisfaction levels and expectations are impacted by changes in lifestyle, reasons for travel and the information accessed prior to making their reservations. The basis of this study was establishing the impact of the information supplied by Online Travel Agents on guest satisfaction levels at The Monarch Hotel. The evolution and function of the tourism distribution channel and the factors affecting guest satisfaction and its measurement were explored.
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Swift, Cathy Owens. "Characteristics of Purchasing Managers That Influence Preferences to Enter Buyer-Seller Partnerships by Single Sourcing". Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc278311/.
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This research addresses the question of whether there are personal characteristics of purchasing managers that lead them to make decisions regarding buyer-seller partnerships, and supplier sourcing in particular, that may be suboptimal, therefore affecting the performance of the firm. This question warrants study due to the current business environment, in which business firms have been entering into both formal and informal buyer-seller partnerships as a means of surviving in a highly competitive
environment.
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Li, Ching-lu, i 李淸露. "The influence of aluminium on enzymes in the rat brain with special reference to those involved in polyanine biosynthesis". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31953888.
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Ritchie, Rebecca Helen. "Acute haemodynamic effects of three cardioactive agents: metoprolol, sotalol and milrinone : influence of myocardial content and systolic interval /". Title page, table of contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phr611.pdf.
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Dowling, Ruth Brigid. "The influence of pharmacological agents on Pseudomonas aeruginosa and Haemophilus influenzae infection of the respiratory mucosa in vitro". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300382.
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Kwok, T. T. "The influence of tumour geometry upon cellular response to cytotoxic agents : An in vitro study using multicellular spheroids". Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372883.
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Velásquez, Juan David. "Cathexis--a computational model for the generation of emotions and their influence in the behavior of autonomous agents". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10651.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.Includes bibliographical references (p. 93-98).
by Juan David Velásquez.
M.S.
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Iarmarcovai, Gwenaëlle. "Influence des agents génotoxiques, des facteurs individuels et du mode de vie sur le contenu centromérique des micronoyaux". Aix-Marseille 2, 2007. http://www.theses.fr/2007AIX20660.
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La technique du FISH (sondes pancentromériques) a été associée au test des micronoyaux (MN) avec blocage de la cytodiérèse pour déterminer : (i) le contenu centromérique de MN de lymphocytes périphériques de travailleurs professionnellement exposés, de patients cancéreux et de volontaires sains et (ii) leur modulation du fait de l’exposition professionnelle, du tabagisme, de la consommation d’alcool, de l’âge, du sexe et du polymorphisme génétique. Divers mécanismes pourraient être à l’origine des MN centromériques : les MN monocentromériques reflèteraient des anomalies de migration, et les MN multicentromériques des anomalies de duplication du centrosome. L'analyse séparée des MN centromériques pourrait améliorer la compréhension des mécanismes de dysfonctionnements cellulaires à leur origine, et permettre de mieux situer le test des MN en terme de mise en évidence d’effets environnementaux, d'instabilité chromosomique, et, in fine, de prévention et/ou prédiction du risque cancérogèneFluorescent in situ hybridization using pancentromeric DNA probes was combined with the cytokinesis-block micronucleus (MN) assay to determine: (i) chromosome damage (MN frequency and number of centromeric signals) in peripheral lymphocytes of occupationally exposed workers, cancer patients and healthy donors, (ii) their modulation due to occupational exposure, smoking habit, alcohol consumption, age, gender, and genetic polymorphisms. Two alternative pathways of chromosome loss would exist: impaired chromosome migration, leading to increased monocentromeric MN, and centrosome amplification, possibly leading to multicentromeric MN. Scoring the number of centromeric signals provides additional information about the mechanisms of cellular dysfunctions in the origin of centromeric MN, may improve the sensitivity of the MN assay in detecting environmental effects and chromosome instability, and would more specifically define the prevention and/or prediction of cancer risk with this assay
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Potdevin, Delphine. "Vers des agents conversationnels animés sociaux : Quelle influence de l'intimité virtuelle sur l'expérience utilisateur et la relation-client ?" Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASW004.
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Les Agents Conversationnels Animés (ACAs) sont de plus en plus présents dans notre quotidien et s’insèrent progressivement dans nos habitudes d’usage. Ces systèmes experts disposent de compétences métier dans des domaines variés (banque, assurances, santé, éducation). Cependant, ces systèmes souffrent encore aujourd’hui d’un défaut d’adoption de la part des utilisateurs, qui, s’ils ne refusent pas catégoriquement de les utiliser, s’en lassent très rapidement. Il se pourrait que les compétences métier seules soient insuffisantes pour satisfaire les utilisateurs et que les compétences sociales des ACAs jouent un rôle important dans la relation-client. A la frontière de la psychologie sociale, de l’informatique affective et de l’ergonomie, cette thèse a ainsi pour enjeu d’explorer l’impact des compétences socioémotionnelles des ACAs sur l’expérience utilisateur (UX) et la relation-client. Pour son rôle central dans les relations humaines, mais également pour sa contribution au sentiment de présence sociale et à la construction de la relation-client, nous avons choisi de nous concentrer sur une compétence sociale particulière : l’intimité. Nous avons développé un modèle théorique d’intimité virtuelle dédié aux ACAs, inspiré de la littérature en psychologie humaine. D’une part, nous avons confirmé la validité de ce modèle dans une série d’études interrogeant la perception d’intimité virtuelle d’observateurs à l’égard d’interactions entre une conseillère touristique virtuelle exprimant des comportements multimodaux intimes et une touriste. Nos résultats montrent que notre agent est capable de susciter autant d’intimité qu’un humain et que la perception d’intimité virtuelle est sensible à différents facteurs de régulation (propriétés de l’interaction, caractéristiques individuelles). D’autre part, nous avons exploré les perceptions, les comportements et l’expérience de vrais touristes en situation réelle d’interaction avec une version autonome de notre conseillère virtuelle intime. Nos résultats désignent l’intimité virtuelle comme un candidat potentiel pour favoriser la dimension sociale de l’interaction humain-agent et tendre vers une meilleure UX. Ils ouvrent de nouvelles perspectives dans le but de permettre aux ACAs de devenir de véritables partenaires sociauxEmbodied Conversational Agents (ECAs) are increasingly present in our daily lives and are gradually finding a place in our habits. These expert systems have professional skills in a wide range of domains (banking, ensurrance, health, education). However, ECAs are still suffering from a lack of adoption by users, who tire of them very quickly or just refuse to use them. One explaination is that profesionnal skills alone are not enought to satisfy users and social skills play an important role in the customer-relationship.At the crossroads of social psychology, affective computing and ergonomics, this thesis aims to explore the impact of socioemotional skills of ECAs on user experience (UX) and the customer-relationship.For its central role in human relationships, but also for its contribution to the sense of social presence and to the building of the customer-relationship, we chose to focus on one particular social skill: intimacy. We developed a theoretical model of virtual intimacy for ECAs, inspired by the literature in human psychology. First, we confirmed the validity of our model in a series of studies investigating the perception of virtual intimacy of observers with respect to interactions between a virtual tourism counselor expressing intimate multimodal behaviors and a tourist. Our results show that our virtual counselor is capable of generating as much intimacy as a human and that the perception of virtual intimacy is sensitive to different regulating factors (interactions properties, individual caracteristics).Second, we explored the perceptions, behaviors and experiences of real tourists in real interaction situations with an autonomous version of our intimate virtual counselor.Our results identify virtual intimacy as a potential candidate to foster the social dimension of human-agent interactions and move toward a better UX. They open up new opportunities to allow ACAs to become genuine social partners
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Moon, Richard John Lee. "An investigation into the influence control agents and microwave heating have upon the synthesis of free radical polymers". Thesis, University of Nottingham, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716839.
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The aim of this thesis was to examine the effect that microwave heating has on polymerisation reactions modified with a range of techniques. The intention was to explain any differences observed between microwave and conventional heating with complete understanding of how the materials used interact with microwave energy. Chapter 1, the introduction chapter, provides an introduction to polymerisation chemistry, and explains important terms which will be used in this thesis. This chapter also provides an introduction into microwave heating, including the mechanisms of microwave heating, and explores some of the controversy surrounding reports of microwave accelerated reactions. Chapter 2 seeks to determine if microwave heating effects polymerisations controlled with chain transfer agents. Chain transfer agents are the most commonly applied industrial technique to control polymerisation reactions. This is performed through investigating the fundamental constant governing chain transfer agents, the chain transfer constant. Reactions were then modified to force conditions thought to be conducive to enhancing microwave reaction differentiation. Chapter 3 examines the effect of microwave heating applied to nitroxide mediated polymerisations. Standard reactions are performed to identify any potential microwave effect, and then different means of accelerating the reaction are examined. This included forcing exothermic conditions on the reactions through significantly increased initiator levels. Chapter 4 examined the effect of microwave heating on the production of hyperbranched polymers, a different polymer architecture to those studied previously. The reactions were performed with a range of different solvents and control agents, which interacted with microwave energy to varying extents, to further probe the effect of microwave heating. Finally these reactions were accelerated using similar techniques as used in Chapter 3 Finally Chapter 5 details how these reactions were performed and the conditions used. This chapter also details the analytical techniques used in this thesis, and describes the condition.
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Soyez, Jean-Baptiste. "Conception et modélisation de systèmes de systèmes : une approche multi-agents multi-niveaux". Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10184/document.
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La problématique générale de cette thèse, qui s'inscrit dans le contexte du projet européen InTraDE (Intelligent Transportation for Dynamic Environment), concerne la modélisation de systèmes de systèmes (SdS). Un SdS est un système composé d'une hiérarchie de systèmes autonomes présents à différents niveaux de représentation. Cette thèse répond au besoin d'outils de modélisation généralistes respectant les caractéristiques fondamentales des SdS, en proposant un formalisme multi-agents mullti-niveaux et les algorithmes qui assurent le respect de ces caractéristiques. L'utilisation d'un modèle multi-agents permet de profiter de l'autonomie naturelle des agents et l'aspect multi-niveaux de notre modèle permet aux entités modélisées de raisonner à propos de l'organisation hiérarchique du système en leur offrant la notion explicite de niveau. En plus de la modélisation des systèmes complexes, cette thèse aborde les problèmatique liées à leur simulation, en particulier, le fait que les ressources informatiques (mémoire et microprocesseur utilisés) nécessaires pour simuler avec précision de tels systèmes sont particulièrement importantes. Nous proposons ainsi une méthodologie pour tirer partie de la capacité des simulations multi-niveaux à produire un compromis entre la précision de la simulation et les ressources informatiques utiliséesThe main problematic of this thesis, which takes place in the context of the european project InTraDE (Intelligent Transportation for Dynamic Environment), deals with the modeling of systems of systems (SoS). A SoS is a system composed of a hierarchy of autonomous systems present in several representation levels. This thesis answers the need of generic modeling tools respecting the fundamental characteristics of SoS, proposing a multi-level multi-agent formalism and algorithms wich insure their respect. The use of a multi-agent model allows to take advantage of the natural autonomy of agents and the multi-level aspect of our model permits to modeled entities to reason about the organisational hierarchy of the system, carrying the explicit notion of level. Besides the modeling of complex systems, this thesis also deals with the problematic related to their simulations, particularly, the fact that computer resources (used memory and microchips) needed to simulate with precision such systems are truly important. We propose a methodology to benefit from the muli-level simulations capacity to produce compromise between the simulation precision and the used computer resources
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Kareem, Fakhriya Mohammed. "The influence of exogenously applied 'anti-stress' agents in the upregulation of the drought response in Iraqi wheat varieties". Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/10667.
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Bread wheat (Triticum aestivum L.) is one of the most important cereal crops grown in the world. It has great importance because it constitutes a major source of carbohydrate for more than one third of the world’s population (Budak et al., 2013). In the last three decades, drought conditions are becoming more widespread in wheat production areas including Europe, Australia and Asia, and it is considered a major cause of reduced wheat growth and productivity in most developing countries with semi-arid climates. Drought constitutes the most important threat for wheat production in Iraq and especially for the Kurdistan Regional Governate owing to the limited source of water during at least some part of the growing period. Because wheat is considered a staple food and has economic importance for the Kurdistan Regional Government research is needed to determine the production capacity of Iraqi wheat varieties under drought stress and the potential for the maximization of the drought tolerance response. The soil moisture holding capacity of the intended growing medium was measured gravimetrically in pots with and without wheat plants and correlated with the soil capacitance measured using a TDR Theta Probe (Delta-T Devices). This was used to determine the available water content of the soil (AWC) and to control and manage the watering regimes during drought studies. The results of a study of the response of different cultivars of Iraqi wheat (Triticum aestivum L.) to watering regimes of 70% and 50% showed that drought stress had a significant effect on the biomass and yield traits especially tiller number and stem bundle weight compared to normal conditions. The highest significant difference was observed for cv. Tamooz 2 in comparison to Adana 99, but there was a little difference between cvs. Rizgary and Sham 6. The effect of the exogenous application of salicylic acid (SA) and molybdenum (Mo) on drought tolerance of cvs. Tamooz 2 and Adana 99, showed that Tamooz 2 had higher values for growth characteristics and higher yield potential when sprayed with a lower concentration of SA (1.44 mM) under well-watered conditions in comparison with Adana 99. The effect of spraying variety Tamooz 2 with SA at different growth stages indicated that biomass production and yield components (the number of spikes/pot, grain dry weight and average 1000 grain dry weight) significantly increased at both stem+flower as well as leaf+stem+flower sprayings for plants subjected to drought. Also, SA treatments at stem extension and flowering had a positive effect on the up-regulation of the drought response gene CBF/DREB under drought stress conditions. These findings indicate that agronomic treatments with exogenous applications of salicylic acid and molybdenum could help to reduce the effects of drought in the field.