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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.
101

Über Gradschranken für Syzygien und kohomologische Hilbertfunktionen.

Nagel, Uwe. Unknown Date (has links)
Universiẗat, Diss., 1990--Paderborn.
102

Geometrische Algorithmen in der Flächenrückführung

Weller, Frank. Unknown Date (has links)
Universiẗat, Diss., 2000--Dortmund. / Dateiformat: PDF.
103

Constructions of cubical polytopes

Schwartz, Alexander. Unknown Date (has links) (PDF)
Techn. University, Diss., 2004--Berlin.
104

Algorithmic geometry via graphics hardware

Denny, Markus Oswald. Unknown Date (has links) (PDF)
University, Diss., 2003--Saarbrücken.
105

Willmore surfaces in Sn: transforms and vanishing theorems

Ma, Xiang. Unknown Date (has links) (PDF)
Techn. University, Diss., 2005--Berlin.
106

Výuka deskriptivní geometrie v našich zemích / Descriptive Geometry Teaching in the Czech Lands

Moravcová, Vlasta January 2016 (has links)
This thesis documents the history of descriptive geometry teaching in the Czech lands from its beginnings (i.e. from the 1830s) to the World War II. The center of the work is the description of development of descriptive geo- metry teaching at secondary schools, especially "Realschule�, supplemented with an analysis of Czech secondary school textbooks and a brief comparison between the situation in the Czech lands and foreign countries. Attention is also paid to the characterisation of descriptive geometry lectures at Czech and German polytechnics and universities in Prague, Brno and Příbram, inclusive of university textbooks. The work also mentions a brief global de- velopment of projection methods and a contribution of Czech geometers to the development of descriptive geometry. The thesis is supplemented with large factual and pictorial addenda.
107

Základy geometrie pro studenty oboru Učitelství pro první stupeň základních škol / Basics of geometry for students of Teacher Training for primary school.

FILIP, Lukáš January 2015 (has links)
The aim of the diploma thesis is to prepare study materials for a subject Basics of geometry for students of Primary school teaching. The materials should define the core concepts of secondary school geometry. Part of the materials are also problems with solutions and exercises with results. Software like DGS are an important support for teaching and will be also part of these materials. At the end af each chapter, there are quiz problems which follow Bloom's taxonomy.
108

Grafická podoba matematiky / A graphical approach to mathematics

BÍNA, Matěj January 2011 (has links)
This thesis broadens the contents of the schoolbooks "Matematika pro gymnázia." It is written primarily as a source material for teachers, however, as it is close to the aforementioned schoolbooks, can be used by students as well.
109

Užití 3D CAD systému SolidWorks ve výuce základů deskriptivní geometrie / Use of 3D CAD system SolidWorks for teaching the foundations of descriptive geometry

HEŘMAN, Michal January 2012 (has links)
The topic of this thesis concerns computer software for 3D modelling SolidWorks and its use for descriptive geometry problems creation. Descriptions of techniques of work in SolidWorks 3D parametric modeller are a part of this thesis, as well as the work with the software itself and description of problems being solved by it. Thesis also includes options of possible use of the final interactive gadget at basic and elementary schools. Moreover, in conclusion there is described to what extend it is appropriate to use SolidWorks software for descriptive geometry problem solving and when some problems might occur.
110

Extension de la technique de perçage vibratoire à des matériaux difficiles à usiner et au domaine du décolletage / Extension of the art drilling vibration to materials which are difficult to machine and the field of cutting

Onder, Olcay 17 October 2011 (has links)
Contexte de travail Le travail de thèse se déroulera en collaboration entre le CTDEC et le laboratoire GSCOP de Grenoble sous la responsabilité scientifique de Henri PARIS. Le travail de thèse sera co-dirigé opar Joël RECH (MdCf) du laboratoire LTDS en poste à l'ENI de Saint-Etienne. Le travail de thèse s'inscrit dans le cadre d'un projet dénommé FGVV (Forage à Grande Vitesse Vibratoire) soutenu par le FCE (pôles de compétitivité VIAMECA et ARVES INDUSTRIES). Objectifs industriels et scientifiques Ce projet FGVV vise essentiellement à maîtriser et à industrialiser la technologie dite de « forage vibratoire ». Cette technologie permet de réaliser des trous de très grandes profondeurs grâce à une vibration axiale du foret conduisant à une fine fragmentation des copeaux qui s'évacuent alors naturellement sans aucune difficulté. Le projet fait suite à plusieurs années de travaux scientifiques et technologiques, qui ont montré la viabilité technique et économique de ce procédé. L'objectif de cette thèse est d'étendre l'utilisation de cette technologie à des applications concernant des diamètres plus petits et sur des matériaux plus difficile à usiner. Le domaine du décolletage est souvent confronter à des perçages de petit diamètre, voire très petit diamètre (<1mm) dans des matériaux difficile à usiner (acier inox, titane, …). Dans ces applications, l'incidence de l'âme du foret devient importante et les modèles mis en place trouve leurs limites. De plus, les aspects thermiques et tribologiques à l'interface copeau outil ne sont pas simples à maîtriser et génèrent un amortissement qui peut être préjudiciable au bon fonctionnement de la tête de perçage vibratoire. Il s'agit, dans un premier temps, à l'aide de résultats expérimentaux d'identifier les phénomènes liés à coupe de ces matériaux qui sont les plus influents sur le comportement dynamique de la tête de perçage vibratoire. Dans un deuxième temps, cette caractérisation devrait permettre de mettre en place des modèles permettant de prédire le comportement et ainsi d'identifier des points de fonctionnement intéressants. Ces modèles seront alors intégrés dans un outil de simulation permettant de prédire le fractionnement du copeau et plus largement le comportement du système composé de la tête de perçage vibratoire, du foret et de la pièce. Dans un troisième temps, l'extension vers les très petits diamètres nécessite une bonne compréhension et un modélisation de l'amortissement issu de l'âme du foret qui devient prépondérant est nécessaire. Enfin, une optimisation des paramètres autour des points de fonctionnement identifiés permettra de répondre au mieux aux contraintes de productivité. Une re conception de la tête, intégrant ces nouvelles connaissances, est alors prévue pour répondre au mieux aux applications industrielles. Les modèles mis en place devraient aussi permettre une extension vers les applications sur des pièces en alliages d'aluminium moulées car les phénomènes de collage du copeau et son l'incidence sur la comportement dynamique de la tête de perçage vibratoire sont aussi présent sur ce type de matériau. / Background work The thesis work is conducted in collaboration between the laboratory and CTDEC GSCOP Grenoble in the scientific responsibility of Henri PARIS. This thesis will be co-directed by Joël RECH (MdCf) laboratory LTDS stationed in ENI Saint-Etienne. This thesis is part of a project called FGVV (Forage Vibratoire a Grande Vitesse) supported by the CFE (competitiveness clusters VIAMECA and ARVES INDUSTRIES). Objectives industrial and scientific This project focuses FGVV control and industrialize a technology called "drilling vibration." This technology can make holes very deep thanks to an axial vibration of drills leading to fragmentation of a thin shavings which go out then naturally without any difficulty. The project follows several years of scientific and technological work, which demonstrated the technical and economic viability of this process. The objective of this thesis is to extend the use of this technology in applications involving smaller diameters and materials more difficult to machine. The field of cutting is often confronted with small-diameter holes, even very small diameter (<1 mm) in materials difficult to machine (stainless steel, titanium,…). In these applications, the impact of the soul of drills becomes important and models introduced found their limits. In addition, thermal and tribological aspects to the interface chip tool are not easy to control and generate an amortization, which may adversely affect the proper functioning of the head of drilling vibration. In a first step, using experimental results to identify phenomena related to cutting of these materials which are most influential on the dynamic behavior of the head of drilling vibration. In a second time, this characterization is expected to introduce models to predict the behaviour and identify points of operation interesting. These models are then integrated into a simulation tool to predict splitting chip and more broadly the behaviour of the system composed of the head drilling vibration, and the drill room. In a third time, extending to the very small diameters requires a good understanding and modeling of depreciation from the soul of drills that becomes dominant is necessary. Finally, an optimization settings around the operating points identified will best respond to constraints on productivity. A re design of the head, incorporating this new knowledge, is then scheduled to suit the industrial applications. The models put in place should also allow an extension to the applications on parts of aluminum alloy castings as the phenomena of bonding the chip and its impact on the dynamic behavior of the head drilling vibration are also present on this type material.

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