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The Global ETD Search service is a free service for researchers
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 181 to 190 of 194 (0.024 seconds)Spelling suggestions: "subject:"handbasket"" "subject:"nanobasket""
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Crafty Conversations : Om konsthantverk, konversationer och det som händer där emellanSandling, Erik January 2020 (has links)
No description available.
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Persoonlikheid, selfaktualisering en toesighouersvaardigheid as voorspellers van toesighouersukses / Personality, self-actualisation and supervisory skill as predictors of supervisor successHanekom, Anton Nel 01 1900 (has links)
Text in Afrikaans / Hierdie verhandeling fokus op persoonlikheid. selfaktualisering en toesighouersvaardighede. as voorspellers van toesighouersukses. Persoonlikheid en selfaktualisering word vanuit die dimensionele en humanistiese persoonlikheidsteoriee en toesighouersvaardighede vanuit die bestuurpsigologie beskryf. 'n Psigometriese toetsbattery is saamgestel uit drie instrumente wat onderskeidelik persoonlikheid (16 PF Vraelys), selfaktualisering
(Persoonlike Orientasie-inventaris) en toesighouersvaardigheid (Posmandjie) evalueer. Vir die doel van hierdie navorsing, is toesighouersukses (volgens prestasiebeoordeling), die afhanklike veranderlike terwyl persoonlikheid. selfaktualisering en toesighouersvaardigheid die onafhanklike veranderlikes is. Die psigometriese toetsbattery is gebruik om te bepaal of daar 'n
verband bestaan tussen: a) persoonlikheid. selfaktualisering en toesighouersvaardigheid
onderling
b) persoonlikheid. selfaktualisering en toesighouersvaardigheid. en
prestasie
c) persoonlikheid, selfaktualisering en toesighouersvaardigheid gesamentlik, en prestasie deur die formulering van statistiese kombinasies.
Die resultate is weergegee en die nulhipoteses aanvaar of verwerp waarna die resultate bespreek is. Hierna is die gevolgtrekking geformuleer dat die gekombineerde statistiese kombinasies of gedeeltes van die drie
psigometriese instrumente saam gebruik kan word om toesighouersukses te voorspel. / This dissertation focuses on personality. self-actualisation and
supervisory skills as predictors of supervisor success. The dimensional and humanistic personality theories were used to
describe personality and self-actualisation while supervisory skills
were explained in the context of management psychology. A psychometric battery was compiled consisting of three instruments to
evaluate personality (16 PF Questionnaire). self-actualisation
(Personality Orientation Questionnaire). and supervisory skills
(In-basket Exercise) respectively.
In this research supervisory success is the dependent variable. and
personality, self-actualisation and supervisory skills the independent
variables.
The psychometric battery were used to determines if any correlation
exists between:
a) personality, self-actualisation and supervisory skills
b) personality, self-actualisation and supervisory skills. and
performance.
c) personality, self-actualisation and supervisory skills combined and
performance through the formulation of statistical combinations.
The results were provided. interpreted and discussed. The conclusion was reached that the statictical combination or parts of the three psychometric instruments combined could be used to predict supervisory success. / Industrial and Organisational Psychology / M. Com. (Bedryfsielkunde)
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| 183 |
Étude des phénomènes de transfert et de l'hydrodynamique dans des réacteurs agités à panier catalytique / Study of external transport phenomena and hydrodynamics in a stirred catalytic basket reactorBraga, Maria 11 February 2014 (has links)
Parmi les différents outils de laboratoire, les réacteurs agités triphasiques à panier catalytique sont souvent utilisés pour l'acquisition de données cinétiques avec des catalyseurs mis en forme. Malgré sa large utilisation, très peu d'auteurs se sont intéressés à la caractérisation de l'hydrodynamique et des transferts de matière de ces outils. Or, dans les cas de réactions rapides, des limitations hydrodynamiques et/ou au transfert peuvent conduire à des difficultés à discriminer les catalyseurs ou à obtenir des paramètres cinétiques. L'objectif de cette étude était de connaître le domaine d'applicabilité de ces outils et présenter des pistes d'optimisation. Une méthodologie de caractérisation qui couple une étude hydrodynamique et une étude de transfert de matière a été mise en place. L'étude hydrodynamique a permis d'établir une cartographie des régimes d'écoulement gaz/liquide selon les conditions opératoires et les configurations géométriques. Cette étude a permis d'expliquer les résultats obtenus au niveau du transfert de matière, notamment, l'influence de la présence du panier et des bulles de gaz. Dans la configuration actuelle, cet outil semble être limité par le transfert liquide/solide. Ainsi, avec ce système, des études cinétiques pour des réactions avec une constante cinétique cin k pouvant aller jusqu'à 0,02 s-1 pourront être réalisées. Au-delà, l'outil sera inadapté. Pour améliorer cet outil de test, il faut optimiser le réacteur en modifiant le design du panier et de la turbine, et le diamètre de la cuve de manière à maximiser la vitesse radiale à travers du milieu poreux. Il faut aussi éviter la présence d'un régime de contournement du panier par le liquide / Stationary catalytic basket stirred reactors are often used among the various three-phase laboratory reactors for primary screening of commercial shaped catalysts. Until today, hydrodynamics and mass transfer studies concerning the impact of the presence of the basket in the flow are scarce which can be an obstacle to catalyst screening mainly in the case of fast reactions. The aim of this study is to know the range of applicability of these devices and optimize them if necessary. A characterization methodology that couples hydrodynamics and mass transfer was developed. The hydrodynamic studies allowed establishing a flow regime map of the gas/liquid flow for different reactor designs and operational conditions. This study has allowed as well understanding the influence of the basket and gas bubbles on gas/liquid and solid/liquid mass transfer. For the studied reactor, the liquid/solid mass transfer is the limiting phenomena. This system can however be used for catalyst screening for reaction rate constants smaller than 0.02 s-1. For faster reactions, these devices must be improved by changing the design of basket and impeller and the tank diameter. The optimized configuration should improve de radial flow through the porous medium and avoid the flow bypassing around the basket
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| 184 |
評估極值相依組合信用風險之有效演算法 / Efficient Algorithms for Evaluating Portfolio Credit Risk with Extremal Dependence施明儒, Shih,Ming Ju Unknown Date (has links)
蒙地卡羅模擬是在組合信用風險的管理上相當實用的計算工具。衡量組合信用風險時，必須以適當的模型描述資產間的相依性。常態關聯結構是目前最廣為使用的模型，但實證研究認為 t 關聯結構更適合用於配適金融市場的資料。在本文中，我們採用 Bassamboo et al. (2008) 提出的極值相依模型建立 t 關聯結構用以捕捉資產之間的相關性。同時，為增進蒙地卡羅法之收斂速度，我們以 Chiang et al. (2007) 的重要性取樣法為基礎，將其拓展到極值相依模型下，並提出兩階段的重要性取樣技巧確保使用此方法估計一籃子信用違約時，所有模擬路徑均會發生信用事件。數值結果顯示，所提出的演算法皆達變異數縮減。而在模型自由度較低或是資產池較大的情況下，兩階段的重要性取樣法將會有更佳的估計效率。我們也以同樣的思路，提出用以估計投資組合損失機率的演算法。雖然所提出的演算法經過重要性取樣的技巧後仍無法使得欲估計的事件在所有模擬路徑下都會發生，但數值結果仍顯示所提出的方法估計效率遠遠優於傳統蒙地卡羅法。 / Monte Carlo simulation is a useful tool on portfolio credit risk management. When measuring portfolio credit risk, one should choose an appropriate model to characterize the dependence among all assets. Normal copula is the most widely used mechanism to capture this dependence structure, however, some emperical studies suggest that $t$-copula provides a better fit to market data than normal copula does. In this article, we use extremal depence model proposed by Bassamboo et al. (2008) to construct $t$-copula. We also extend the importance sampling (IS) procedure proposed by Chiang et al. (2007) to evaluate basket credit default swaps (BDS) with extremal dependence and introduce a two-step IS algorithm which ensures credit events always take place for every simulation path. Numerical results show that the proposed methods achieve variance reduction. If the model has lower degree of freedom, or the portfolio size is larger, the two-step IS method is more efficient. Following the same idea, we also propose algorithms to estimate the probability of portfolio losses. Althought the desired events may not occur for some simulations, even if the IS technique is applied, numerical results still show that the proposed method is much better than crude Monte Carlo.
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Uplatnění biopotravin ve školních jídelnách: základní školy (České Budějovice) / Use of bio-food in school canteens: primary schools in České BudějoviceRUSFELOVÁ, Zuzana January 2011 (has links)
School canteens can significantly influence children?s eating habits and can demonstrate them perfectly good principles in food selection. The main objective of this thesis is to analyze the interest of school management and pupils? parents in the introduction of organic food in school canteen menus. The questionnaire survey was targeted at primary school and their school canteens that lie in the statutory city of České Budějovice and its immediate surroundings.
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| 186 |
Persoonlikheid, selfaktualisering en toesighouersvaardigheid as voorspellers van toesighouersukses / Personality, self-actualisation and supervisory skill as predictors of supervisor successHanekom, Anton Nel 01 1900 (has links)
Text in Afrikaans / Hierdie verhandeling fokus op persoonlikheid. selfaktualisering en toesighouersvaardighede. as voorspellers van toesighouersukses. Persoonlikheid en selfaktualisering word vanuit die dimensionele en humanistiese persoonlikheidsteoriee en toesighouersvaardighede vanuit die bestuurpsigologie beskryf. 'n Psigometriese toetsbattery is saamgestel uit drie instrumente wat onderskeidelik persoonlikheid (16 PF Vraelys), selfaktualisering
(Persoonlike Orientasie-inventaris) en toesighouersvaardigheid (Posmandjie) evalueer. Vir die doel van hierdie navorsing, is toesighouersukses (volgens prestasiebeoordeling), die afhanklike veranderlike terwyl persoonlikheid. selfaktualisering en toesighouersvaardigheid die onafhanklike veranderlikes is. Die psigometriese toetsbattery is gebruik om te bepaal of daar 'n
verband bestaan tussen: a) persoonlikheid. selfaktualisering en toesighouersvaardigheid
onderling
b) persoonlikheid. selfaktualisering en toesighouersvaardigheid. en
prestasie
c) persoonlikheid, selfaktualisering en toesighouersvaardigheid gesamentlik, en prestasie deur die formulering van statistiese kombinasies.
Die resultate is weergegee en die nulhipoteses aanvaar of verwerp waarna die resultate bespreek is. Hierna is die gevolgtrekking geformuleer dat die gekombineerde statistiese kombinasies of gedeeltes van die drie
psigometriese instrumente saam gebruik kan word om toesighouersukses te voorspel. / This dissertation focuses on personality. self-actualisation and
supervisory skills as predictors of supervisor success. The dimensional and humanistic personality theories were used to
describe personality and self-actualisation while supervisory skills
were explained in the context of management psychology. A psychometric battery was compiled consisting of three instruments to
evaluate personality (16 PF Questionnaire). self-actualisation
(Personality Orientation Questionnaire). and supervisory skills
(In-basket Exercise) respectively.
In this research supervisory success is the dependent variable. and
personality, self-actualisation and supervisory skills the independent
variables.
The psychometric battery were used to determines if any correlation
exists between:
a) personality, self-actualisation and supervisory skills
b) personality, self-actualisation and supervisory skills. and
performance.
c) personality, self-actualisation and supervisory skills combined and
performance through the formulation of statistical combinations.
The results were provided. interpreted and discussed. The conclusion was reached that the statictical combination or parts of the three psychometric instruments combined could be used to predict supervisory success. / Industrial and Organisational Psychology / M. Com. (Bedryfsielkunde)
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| 187 |
Some topics in mathematical finance: Asian basket option pricing, Optimal investment strategiesDiallo, Ibrahima 06 January 2010 (has links)
This thesis presents the main results of my research in the field of computational finance and portfolios optimization. We focus on pricing Asian basket options and portfolio problems in the presence of inflation with stochastic interest rates.<p><p>In Chapter 2, we concentrate upon the derivation of bounds for European-style discrete arithmetic Asian basket options in a Black and Scholes framework.We start from methods used for basket options and Asian options. First, we use the general approach for deriving upper and lower bounds for stop-loss premia of sums of non-independent random variables as in Kaas et al. [Upper and lower bounds for sums of random variables, Insurance Math. Econom. 27 (2000) 151–168] or Dhaene et al. [The concept of comonotonicity in actuarial science and finance: theory, Insurance Math. Econom. 31(1) (2002) 3–33]. We generalize the methods in Deelstra et al. [Pricing of arithmetic basket options by conditioning, Insurance Math. Econom. 34 (2004) 55–57] and Vanmaele et al. [Bounds for the price of discrete sampled arithmetic Asian options, J. Comput. Appl. Math. 185(1) (2006) 51–90]. Afterwards we show how to derive an analytical closed-form expression for a lower bound in the non-comonotonic case. Finally, we derive upper bounds for Asian basket options by applying techniques as in Thompson [Fast narrow bounds on the value of Asian options, Working Paper, University of Cambridge, 1999] and Lord [Partially exact and bounded approximations for arithmetic Asian options, J. Comput. Finance 10 (2) (2006) 1–52]. Numerical results are included and on the basis of our numerical tests, we explain which method we recommend depending on moneyness and time-to-maturity<p><p>In Chapter 3, we propose some moment matching pricing methods for European-style discrete arithmetic Asian basket options in a Black & Scholes framework. We generalize the approach of Curran M. (1994) [Valuing Asian and portfolio by conditioning on the geometric mean price”, Management science, 40, 1705-1711] and of Deelstra G. Liinev J. and Vanmaele M. (2004) [Pricing of arithmetic basket options by conditioning”, Insurance: Mathematics & Economics] in several ways. We create a framework that allows for a whole class of conditioning random variables which are normally distributed. We moment match not only with a lognormal random variable but also with a log-extended-skew-normal random variable. We also improve the bounds of Deelstra G. Diallo I. and Vanmaele M. (2008). [Bounds for Asian basket options”, Journal of Computational and Applied Mathematics, 218, 215-228]. Numerical results are included and on the basis of our numerical tests, we explain which method we recommend depending on moneyness and<p>time-to-maturity.<p><p>In Chapter 4, we use the stochastic dynamic programming approach in order to extend<p>Brennan and Xia’s unconstrained optimal portfolio strategies by investigating the case in which interest rates and inflation rates follow affine dynamics which combine the model of Cox et al. (1985) [A Theory of the Term Structure of Interest Rates, Econometrica, 53(2), 385-408] and the model of Vasicek (1977) [An equilibrium characterization of the term structure, Journal of Financial Economics, 5, 177-188]. We first derive the nominal price of a zero coupon bond by using the evolution PDE which can be solved by reducing the problem to the solution of three ordinary differential equations (ODE). To solve the corresponding control problems we apply a verification theorem without the usual Lipschitz assumption given in Korn R. and Kraft H.(2001)[A Stochastic control approach to portfolio problems with stochastic interest rates, SIAM Journal on Control and Optimization, 40(4), 1250-1269] or Kraft(2004)[Optimal Portfolio with Stochastic Interest Rates and Defaultable Assets, Springer, Berlin].<p><p><p> / Doctorat en Sciences / info:eu-repo/semantics/nonPublished
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Interactions synaptiques entre les interneurones de la couche moléculaire du cervelet / Synaptic interactions among interneurons in the molecular layer of the cerebellumAlcami Ayerbe, José 30 April 2013 (has links)
Les interneurones de la couche moléculaire du cervelet (ICM: cellules en panier et cellules étoilées) sont connectés par des synapses électriques fréquentes et puissantes chez les jeunes rats et souris autour de la fin de la deuxième semaine postnatale. Les courants capacitifs des ICM montrent une composante lente qui reflète la charge des interneurones couplés électriquement. Leur analyse permet de quantifier le nombre de cellules directement couplées à une cellule et le nombre équivalent de cellules couplées (Alcami et Marty, soumis), et d'établir une difference de couplage entre les cellules en panier et les cellules étoilées pendant le développement postnatal. Elle a mené à proposer une topologie de réseau des cellules en panier. La force du couplage peut être modulée par les courants intrinsèques, dont Ih dans le domaine hyperpolarisant. Les synapses électriques modifient la propagation et les patrons d'activité dans le réseau des ICM en réponse à une excitation du réseau.L'étude de la connectivité des ICM par des synapses chimiques GABAergiques nous a mené à réexaminer les sources d'erreur des mesures d'activité électrique en configuration cellule attachée (Alcami et coll., 2012). Les mesures en cellule attachée peuvent modifier l'activité électrique des ICM en introduisant un couplage conductif entre la pipette d'enregistrement et l'intérieur cellulaire, résultant d'une combinaison de mécanismes de couplage passifs et actifs. / Molecular layer interneurons of the cerebellum (MLIs: basket cells and stellate cells) are connected by frequent and strong electrical synapses in young rats and mice around the end of the second postnatal week. Capacitive currents of MLIs show a slow component that reflects the charge of electrically-coupled MLIs. The analysis of capacitive currents makes it possible to quantify the number of directly connected cells and the equivalent number of coupled cells (Alcami and Marty, submitted). They were used to show a difference in coupling between basket and stellate cells and propose a model of the basket cell coupled network. Electrical coupling strength can be modulated by intrinsic currents, like the h current in the hyperpolarizing range. Electrical synapses modify the propagation and the patterns of activity in the MLI network, when the network is excited.The study of connectivity of MLIs by chemical GABAergic synapses led us to reevaluate the sources of error of cell-attached recordings (Alcami et al., 2012). Cell-attached measurements can modify cellular electrical activity of MLIs, by introducing a conductif coupling between the recording pipette and the cell interior, resulting from a combination of passive and active coupling.
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Acute sports injuries in Sweden and their possible prevention : an epidemiological study using insurance dataÅman, Malin January 2017 (has links)
Physical activity is an essential component of a healthy life, e.g. to prevent obesity, cardiovascular disease and premature death, of which sports can be an important part. Unfortunately, sports activities increase the risk of both overuse and acute injuries. Severe acute injuries may also lead to a permanent medical impairment (PMI), which may influence the ability to be physically active throughout life. However, sports injuries may be prevented, but a profound understanding of the injuries and how to prevent them is needed. This doctoral thesis examine acute sports injuries reported by licensed athletes of all ages and level of sports nationwide in Sweden, by using national insurance data. Approximately 80% of all the Sports Federations (SF) had their mandatory accident insurance in the insurance company Folksam, and since there is no national sports injury surveillance system in Sweden, this is a unique database, able to be used in epidemiological studies on acute injuries occurring in organized sports in Sweden. The main aim of this thesis was to identify high-risk sports for acute injuries, the most common and the most severe injuries, especially in large sports with numerous licensed athletes, many injuries and injuries resulting in PMI. Based on the results, there will be recommendations regarding sports and body locations where injury prevention efforts should be focused to gain the greatest prevention effect at a national level in Sweden. Another aim was to evaluate the effectiveness of a neuromuscular knee control training program (KCP) that has been implemented nationwide to reduce knee and cruciate ligament injuries, among football players in Sweden. After evaluating the validity and reliability of the information within the database based on international guidelines, acute injury data were examined and the results presented in four papers. These results showed that there is a need of injury prevention especially in motorcycle sports, team ball sports, and ice hockey. Particularly, knee injuries need to be prevented since they were both the most common injuries and leading to PMI. The severe head- and upper limb injuries also need attention. Sixty-nine percent of the PMI injured athletes, were younger than 25 years. The injury prevention training program, KCP can be considered partially implemented nationwide, since 21 out of 24 district SFs provided KCP educations. The incidence of knee and cruciate ligament injuries has decreased among football players in Sweden. A concerning aspect is that there is no national official policy regarding sports injury and injury prevention in Sweden, nor an official authority that has the explicit responsibility for these issues.
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Využití data miningu v řízení podniku / Using data mining to manage an enterprise.Prášil, Zdeněk January 2010 (has links)
The thesis is focused on data mining and its use in management of an enterprise. The thesis is structured into theoretical and practical part. Aim of the theoretical part was to find out: 1/ the most used methods of the data mining, 2/ typical application areas, 3/ typical problems solved in the application areas. Aim of the practical part was: 1/ to demonstrate use of the data mining in small Czech e-shop for understanding of the structure of the sale data, 2/ to demonstrate, how the data mining analysis can help to increase marketing results. In my analyses of the literature data I found decision trees, linear and logistic regression, neural network, segmentation methods and association rules are the most used methods of the data mining analysis. CRM and marketing, financial institutions, insurance and telecommunication companies, retail trade and production are the application areas using the data mining the most. The specific tasks of the data mining focus on relationships between marketing sales and customers to make better business. In the analysis of the e-shop data I revealed the types of goods which are buying together. Based on this fact I proposed that the strategy supporting this type of shopping is crucial for the business success. As a conclusion I proved the data mining is methods appropriate also for the small e-shop and have capacity to improve its marketing strategy.
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