Bamboo has been one of the most important housing materials for families of all income-levels for generations in many parts of the world. Through an analysis of methods of construction used for housing in the coffee region of Colombia, this thesis investigates the most important features of the use of bamboo in the traditional and modern techniques used to build walls, floors and structures. / In conducting this research I collected extensive graphic material such as pictures, sketches, drawings and plans, from old and new town houses, rural houses, haciendas, and slums, in the three main regions of Colombia, where bamboo is the most important natural resource for construction. / The first part of the study gives a general overview of construction systems for walls, floors and structures in housing using bamboo throughout the world, especially in Asia and America. The second part is a study of one of the three regions in Colombia where environment, its preservation, and its sustainability are the main issues, and it contains an analysis of the data collected from the three regions. The main part of the thesis classifies and analyses new techniques and systems that are applied in the construction of walls, floors and structures in the region of Old Caldas, Colombia.

No description available.

The thesis is a study of a Guaraní community (comunidad) situated in the Department of Santa Cruz in the southeastern lowlands of Bolivia. The thesis uses the concept of ‘comunidad’ as a focus of investigation. While this concept is one that is familiar and firmly embedded in contemporary discourses throughout Bolivia, the meanings which different people and interest groups attach to it and the purposes which they ascribe to it are far from unanimous. Apart from the physical and legal entity, comprising a group of people, the land on which they live, and the legal title for its ownership, a comunidad is a multifaceted and multilayered complex of diverging and sometimes competing ideas, desires and agendas. Questioning the concept of ‘comunidad’ in this way opens up new perspectives on what people are doing and why that could easily be overlooked in continuing to assume that we know what we are talking about when talking about a ‘comunidad indígena’ in Bolivia today. The thesis explores the case of Cañón de Segura by eliciting and bringing together the various claims and perspectives that impact on the lives of its inhabitants (comunarios). Starting with a historical overview to situate the comunidad within Bolivian and Guaraní history, the thesis moves into an ethnographic discussion of the comunarios’ own perceptions and meanings of ‘comunidad’, followed by an exploration of various outsiders’ perspectives on the same topic that impact on the comunarios’ lives in different ways. The aim of the thesis is to illustrate the overlap and entanglements between these different positions in order to show how the different perspectives on the meaning and purpose of a Guaraní ‘comunidad’ all contribute to shape the actual realities of people’s lives ‘on the ground’.

Thesis (Ph.D.)--Boston University Vita. Includes bibliographical references (leaves [157]-169). / It was the purpose of this study to test hypotheses concerning the relationship of the variables of self-esteem and stability of the self-concept to the relative level of personality adjustment, as well as to see how interactions of these variables in combination were related to adjustment. The study stemmed from an investigation by Brownfain which attempted to validate the stability of the self-concept as a predictor of personality adjustment . The variable of self-esteem was mentioned but not controlled in his study. The present study used a self-rating inventory devised by Brownfain in order to measure these independent variables, but examined them in relation to different adjustment criteria.

Typescript (photocopy). / Digitized by Kansas Correctional Industries / Department: Dietetics, Restaurant, and Institutional Management.

Thesis (Ph. D.)--University of Oregon, 2006. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 729-756). Also available for download via the World Wide Web; free to University of Oregon users.

In the past two decades depth-sensing indentation has becomea widely used technique to measure the mechanical properties ofmaterials. This technique is particularly suitable for thecharacterisation of materials at sub-micro or nano scale thoughthere is a tendency to extend its application to the micro ormacro scale. The load-penetration depth curve of depth-sensingindentation is a characteristic of a material and can be usedfor analysing various mechanical properties in addition tohardness. This thesis deals with the mechanicalcharacterisation of bulk materials, thin films and coatings,gradient materials, and composites using depth-sensingindentation. Finite element method has been resorted to as atool to understand the indentation behaviour of materials. The piling-up or sinking-in behaviour of materials plays animportant role in the accurate determination of materialsproperties using depth-sensing indentation. Finite elementsimulations show that the piling-up or sinking-in behaviour isdetermined by the material parameters, namelyE/σyratio and strain hardening exponent orexperimental parameterhe/hmaxratio, and the contact friction. Anempirical model has been proposed to relate the contact area ofindentation to theE/σyratio and thehe/hmaxratio and used to predict thepiling-up orsinking-in of materials. The existence of friction is found toenhance the sinking-in tendency of materials. A generalrelationship between the hardness and the indentationrepresentative stress valid for both soft and hard materialshas been obtained. A possible method to estimate the plasticproperties of bulk materials has been suggested. Measuring the coating-only properties requires theindentation to be done within a critical penetration depthbeyond which substrate effect comes in. The ratio of thecritical penetration depth to the coating thickness determinedby nanoindentation is independent of coating thickness andabout 0.2 for gold / nickel, 0.4 for aluminium / BK7 glass, and0.2 for diamond-like-carbon / M2 steel and alumina / nickel.Finite element simulations show that this ratio is dependent onthe combination of the coating and the substrate and moresensitive to differences in the elastic properties than in theplastic properties of the coating/substrate system. Thedeformation behaviour of coatings, such as, piling-up of thesoft coatings and cracking of the hard coatings, has also beeninvestigated using atomic force microscope. The constraint factors, 2.24 for WC phase and 2.7 for WC-Cocemented carbides, are determined through nanoindentation andfinite element simulations. A modified hardness model of WC-Cocemented carbides has been proposed, which gives a betterestimation than the Lee and Gurland hardness model. Finiteelement method has also been used to investigate theindentation behaviour of WC-Co gradient coatings. Keywords:depth-sensing indentation, nanoindentation,finite element method, atomic force microscope, mechanicalproperties, hardness, deformation, dislocations, cracks,piling-up, sinking-in, indentation size effect, thin coatings,composite, gradient materials, WC-Co, diamond-like-carbon,alumina, gold, aluminium, nickel, BK7 glass, M2 steel.

Graduation date: 1953

<p>In the past two decades depth-sensing indentation has becomea widely used technique to measure the mechanical properties ofmaterials. This technique is particularly suitable for thecharacterisation of materials at sub-micro or nano scale thoughthere is a tendency to extend its application to the micro ormacro scale. The load-penetration depth curve of depth-sensingindentation is a characteristic of a material and can be usedfor analysing various mechanical properties in addition tohardness. This thesis deals with the mechanicalcharacterisation of bulk materials, thin films and coatings,gradient materials, and composites using depth-sensingindentation. Finite element method has been resorted to as atool to understand the indentation behaviour of materials.</p><p>The piling-up or sinking-in behaviour of materials plays animportant role in the accurate determination of materialsproperties using depth-sensing indentation. Finite elementsimulations show that the piling-up or sinking-in behaviour isdetermined by the material parameters, namely<i>E/σ</i><i>y</i>ratio and strain hardening exponent orexperimental parameter<i>h</i><i>e</i><i>/h</i><i>max</i>ratio, and the contact friction. Anempirical model has been proposed to relate the contact area ofindentation to the<i>E/σ</i><i>y</i>ratio and the<i>h</i><i>e</i><i>/h</i><i>max</i>ratio and used to predict thepiling-up orsinking-in of materials. The existence of friction is found toenhance the sinking-in tendency of materials. A generalrelationship between the hardness and the indentationrepresentative stress valid for both soft and hard materialshas been obtained. A possible method to estimate the plasticproperties of bulk materials has been suggested.</p><p>Measuring the coating-only properties requires theindentation to be done within a critical penetration depthbeyond which substrate effect comes in. The ratio of thecritical penetration depth to the coating thickness determinedby nanoindentation is independent of coating thickness andabout 0.2 for gold / nickel, 0.4 for aluminium / BK7 glass, and0.2 for diamond-like-carbon / M2 steel and alumina / nickel.Finite element simulations show that this ratio is dependent onthe combination of the coating and the substrate and moresensitive to differences in the elastic properties than in theplastic properties of the coating/substrate system. Thedeformation behaviour of coatings, such as, piling-up of thesoft coatings and cracking of the hard coatings, has also beeninvestigated using atomic force microscope.</p><p>The constraint factors, 2.24 for WC phase and 2.7 for WC-Cocemented carbides, are determined through nanoindentation andfinite element simulations. A modified hardness model of WC-Cocemented carbides has been proposed, which gives a betterestimation than the Lee and Gurland hardness model. Finiteelement method has also been used to investigate theindentation behaviour of WC-Co gradient coatings.</p><p><b>Keywords:</b>depth-sensing indentation, nanoindentation,finite element method, atomic force microscope, mechanicalproperties, hardness, deformation, dislocations, cracks,piling-up, sinking-in, indentation size effect, thin coatings,composite, gradient materials, WC-Co, diamond-like-carbon,alumina, gold, aluminium, nickel, BK7 glass, M2 steel.</p>

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