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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the 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.
1

French prisoners of war on parole in Britain (1803-1814)

Bennett, Roy January 1964 (has links)
No description available.
2

Runaways at the training institution central Ohio /

Bartollas, Clemens Lester January 1973 (has links)
No description available.
3

Determination of escape-proneness among reformatory inmates

Eisenklam, Peter A. January 1968 (has links)
There is no abstract available for this thesis.
4

Wayfinding in complex spaces

Thompson, Bill January 1999 (has links)
This thesis is primarily a theoretical examination of people environment relationships directed towards the performance requirements of buildings for human occupation. It commences with a review of extant behavioural models used in the fields of Life Fire Safety Engineering and Wayfinding. The review includes several other interconnected disciplines and areas of interest such as space syntax and cognitive science. Extant behavioural models are described as essentially mechanical however there is also another, less familiar and not yet fully understood, symbiotic model. The symbiotic model is expanded and a new form of spatial analysis, developmental syntax, presented. Symbiotic models seem capable of providing a theoretical base for both the mechanical and also more subtle and complex relationships between space, social interaction and personal knowledge. Case studies are included as tentative explorations of developmental syntax and the symbiotic model in use and recommendations are made for further research into both developmental syntax and the symbiotic model.
5

Modelling occupant evacuation during fire emergencies in buildings /

Gruchy, Derek F. H. January 1900 (has links)
Thesis (M. App. Sc.)--Carleton University, 2004. / Includes bibliographical references (p. 149-152). Also available in electronic format on the Internet.
6

Estudo de um método para projectar sistemas de escape de um motor de combustão interna a 4 tempos

Rocha, Rodrigo Gomes da January 2010 (has links)
Tese de mestrado integrado. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto. 2010
7

Behavioural assessment and identification tools for sea bream and sea bass escapees: implications for sustainable aquaculture management / Estudio comportamental y herramientas de identificación de doradas y lubinas escapadas: implicaciones para la gestión sostenible de la acuicultura

Arechavala-Lopez, Pablo 04 November 2012 (has links)
No description available.
8

The behavioral effect of laboratory turbulence on copepods

Rasberry, Katherine Denise 13 July 2005 (has links)
Copepod species are distributed throughout the ocean by many factors, including chemical, biological, and physical effects. Turbulence in the ocean has been suggested as a factor that vertically partitions some species of copepod. Copepods may seek calmer waters by sinking to deeper levels as the surface waters become more turbulent, or may maintain their position in turbulent waters. The goal of this study is to determine the behavioral effects of turbulence on three species of copepod, Calanus finmarchicus, Acartia tonsa, and Temora longicornis. Experiments consisted of exposing each of the species to stagnant water plus four levels of turbulence intensity. The experiments were conducted in a laboratory apparatus that mimics oceanic turbulence. The turbulence characteristics have been previously characterized by particle image velocimetry (PIV), that show the turbulence to be nearly isotropic and homogeneous in the observation region. Behavior responses were quantified via several measures, including the number of animals phototactically aggregating per minute, the number of escape events, the swimming speed, and the net-to-gross-displacement ratio. There are important conclusions about the effect of laboratory turbulence on copepods. The size of the copepod has a significant effect on its aggregation and swimming capability with increasing turbulence. The smaller copepods had less ability to overcome a strong flow field, and they were more likely to be advected by the stronger flow fields. Swim style also can influence how a copepod reacts to increased turbulence. If the copepod is a hop and sink traveler, then the copepod continues to hop and sink more than its cruising counterparts as turbulence increases. The cruise and sink travelers did not alter the number of escapes in response to turbulence.
9

Práce kurátora pro mládež s dětmi v zařízeních pro výkon ústavní a ochranné výchovy / Activity of officers in charge of youth in risk with children in facilities for institutional and protective education

Dembická, Veronika January 2011 (has links)
This thesis aims to analyze the activity of officers in charge of youth in risk with children, which for various reasons were given into the care facility for institutional or protective care. The thesis closely specifies the officers in charge of youth in risk in the social and legal protection of children and the clientele to which its activities are focused. In the third chapter are described steps that may be of interest to protect the rights and interests of the child adopted. The following three chapters are devoted to institute of institutional and protective care - reasons which may be resorted to these measures, what competences and duties belong to the officers in charge of youth in risk and how are the termination or withdrawal of the measure. A separate chapter is devoted to the theme of family preservation, as a process that supports the functioning of the family. In some cases is demonstrated what specific procedures officers in charge of youth in risk in Usti nad Labem in solving educational problems of children benefiting.
10

Numerical study of EGR mixing and distribution in a piston engine intake line

García Olivas, Guillermo 10 January 2022 (has links)
[ES] Teniendo en cuenta la cantidad de motores de combustión interna que se encuentran en activo actualmente, y sus potenciales emisiones de contaminación si se realizaran de forma incontrolada por el parque automovilístico, las normativas internacionales son cada vez más estrictas en cuanto a la cantidad de gases perjudiciales para el medio ambiente que pueden emitir dichos motores de manera unitaria. Debido a ello, se han ido desarrollando e implantando técnicas de reducción de contaminantes como el downsizing en el cual se reduce el tamaño del motor para reducir el consumo, la implantación de motores híbridos y la Recirculación de Gases de Escape. Esta técnica de recirculación puede abordarse de dos maneras alternativas: la Recirculación de Gases de Escape de Ruta Larga inyecta dichos gases antes del compresor, mientras que la Recirculación de Gases de Escape de Ruta Corta (o alta presión) los reinyecta después del compresor, en el mismo colector de admisión del motor. Dado que en ambas configuraciones se produce una inyección directa del flujo recirculado en la corriente principal, en el presente trabajo se propone un estudio numérico de la mezcla entre las corrientes de aire y gases recirculados usando un software comercial de mecánica de fluidos computacional (STAR-CCM+). En la configuración de Ruta Larga se ha propuesto en primer lugar estudiar el efecto en los parámetros globales del compresor de una entrada heterogénea compuesta por aire y gases de escape. Para ello, se han analizado 9 puntos de funcionamiento distintos, tratando de abarcar el mapa completo del compresor centrífugo con una tasa de inyección constante. Se ha demostrado, por un lado, la necesidad de un esquema transitorio de cálculo para la obtención de resultados confiables en todo el dominio del compresor. Por otro lado, se ha demostrado que, con tasas de penetración de flujo estándar, la inyección de gases recirculados no tiene un impacto reseñable en las prestaciones del compresor, con excepción de la zona de bombeo. En segundo lugar, se ha desarrollado un diseño numérico de experimentos en configuración de Ruta Larga con el objetivo de encontrar correlaciones entre la condensación generada en dichas uniones (la cual puede aparecer bajo ciertas condiciones de operación del motor) y la mezcla entre las corrientes de aire y gases de escape. Se ha demostrado que la penetración de los gases en la corriente principal es un factor clave en la condensación generada, aumentando la cantidad de mezcla entre ambas corrientes. En la configuración de Ruta Corta se han realizado estudios de configuración numérica tratando de estudiar la influencia de factores como malla, tamaño del paso temporal y modelos de turbulencia en la distribución final de los gases de escape entre los diferentes cilindros del motor. Se ha demostrado que los submodelos RANS pueden predecir la mayor parte de puntos de operación tanto en variables medias como instantáneas comparando resultados numéricos con mediciones experimentales. Fijando una configuración numérica, posteriormente se han analizado diferentes mezcladores en colectores de motores de 4 y 6 cilindros, demostrando la aplicabilidad de los índices de mezclado desarrollados y cuantificando la influencia de los diferentes efectos físicos que influyen en la distribución y mezcla de los gases de escape en la corriente principal. / [CA] Tenint en compte la quantitat de motors de combustió interna que es troben en actiu actualment, i les seues potencials emissions de contaminació si es realitzaren de manera incontrolada pel parc automobilístic, les normatives internacionals són cada vegada més estrictes quant a la quantitat de gasos perjudicials per al medi ambient que poden emetre aquests motors de manera unitària. A causa d'això, s'han anat desenvolupant i implantant tècniques de reducció de contaminants com el downsizing en el qual es redueix la grandària del motor per a reduir el consum, la implantació de motors híbrids i la Recirculació de Gasos de Fuita. Aquesta tècnica de recirculació pot abordar-se de dues maneres alternatives: la Recirculació de Gasos de Fuita de Ruta Llarga injecta aquests gasos abans del compressor, mentre que la Recirculació de Gasos de Fuita de Ruta Curta (o alta pressió) els reinjecta després del compressor, en el mateix collector d'admissió del motor. Atés que en totes dues configuracions es produeix una injecció directa del flux recirculat en el corrent principal, en el present treball es proposa un estudi numèric de la mescla entre els corrents d'aire i gasos recirculats usant un programari comercial de mecànica de fluids computacional (STAR-CCM+). En la configuració de Ruta Llarga s'ha proposat en primer lloc estudiar l'efecte en els paràmetres globals del compressor d'una entrada heterogènia composta per aire i gasos de fuita. Per a això, s'han analitzat 9 punts de funcionament diferents, tractant d'abastar el mapa complet del compressor centrífug amb una taxa d'injecció constant. S'ha demostrat, d'una banda, la necessitat d'un esquema transitori de càlcul per a l'obtenció de resultats de confiança en tot el domini del compressor. D'altra banda, s'ha demostrat que, amb taxes de penetració de flux estàndard, la injecció de gasos recirculats no té un impacte ressenyable en les prestacions del compressor, amb excepció de la zona de bombament. En segon lloc, s'ha desenvolupat un disseny numèric d'experiments en configuració de Ruta Llarga amb l'objectiu de trobar correlacions entre la condensació generada en aquestes unions (la qual pot aparéixer sota unes certes condicions d'operació del motor) i la mescla entre els corrents d'aire i gasos de fuita. S'ha demostrat que la penetració dels gasos en el corrent principal és un factor clau en la condensació generada, augmentant la quantitat de mescla entre tots dos corrents. En la configuració de Ruta Curta s'han realitzat estudis de configuració numèrica tractant d'estudiar la influència de factors com a malla, grandària del pas temporal i models de turbulència en la distribució final dels gasos de fuita entre els diferents cilindres del motor. S'ha demostrat que els submodelos RANS poden predir la major part de punts d'operació tant en variables mitjanes com instantànies comparant resultats numèrics amb mesuraments experimentals. Fixant una configuració numèrica, posteriorment s'han analitzat diferents mescladors en col·lectors de motors de 4 i 6 cilindres, demostrant l'aplicabilitat dels índexs de barrejat desenvolupats i quantificant la influència dels diferents efectes físics que influeixen en la distribució i mescla dels gasos de fuita en el corrent principal. / [EN] Considering the amount of internal combustion engines (ICEs) existing nowadays, and the pollutants that they could potentially emit, it is no surprise that international standards are getting increasingly severe regarding the allowed limits of pollutants that can be released by such engines. For this reason, different techniques have been developed in order to diminish pollutants, as downsizing in which the engine size is reduced to decrease the consumption, the hybridation of engines and the exhaust gases recirculation (EGR). This recirculation technique can be addressed by 2 different paths: Low Pressure EGR (LP-EGR) which reintroduce the exhaust gases before the compressor, while High Pressure EGR (HP-EGR) injects exhaust gases after the compressor in the intake manifold. Since both configurations deal with a direct injection of the recirculated flow in the main stream, in the present work a numerical study of the mixing between air and EGR flows is proposed, using a commercial code of computational fluid dynamics (STAR-CCM+). In LP-EGR configuration has been proposed the study of the influence of a heterogeneous inlet (composed by air and exhaust gases) on the main performance of a centrifugal compressor. To do that, 9 different operating points have been analyzed, trying to cover the whole map of the compressor with a constant injection rate. It has been demonstrated the necessity of a transient scheme for obtaining reliable results in the complete domain of the compressor. On the other hand, it has been proved that, with standard penetration rates of the flow, EGR do not have a remarkable impact in the performance of the compressor, besides the surge zone. In LP-EGR scheme, a numerical design of experiments has been developed with the aim to find correlations between the generated volume condensation (which can appear under some operating points of the engine) and the mixing between air and exhaust gases. It has been proved that the penetration of the EGR in the main stream is a key factor in volume condensation, increasing the amount of mixing between the streams. In HP-EGR configuration, different studies of numerical configuration have been conducted trying to find the influence of factors like mesh, time-step size, and turbulence models in the final distribution of exhaust gases between the cylinders of the engine. RANS submodels have demonstrated that can predict most of the operating points both average and instantaneous variables in comparison with experimental measurements. After that, fixing a numerical setup, different mixers in 4 and 6 cylinder manifolds have been calculated, showing the applicability of the developed mixing indexes, and quantifying the influence of the different physical effects that can influence in the mixing and distribution between air and exhaust gases streams. / García Olivas, G. (2021). Numerical study of EGR mixing and distribution in a piston engine intake line [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/179406 / TESIS

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