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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.
21

Výroba nástrčného klíče / Production of socket wrench

Kryštof, Marek January 2020 (has links)
This thesis propses the design of production of a socket wrench. A socket wrench is used as safety wrench for loosening safety screws of the car wheels. The proper technology for production was chosen based on the component requirements. The component is made by using metal extrusion and heading. The starting blank for metal forming was chosen steel rod made of 1.7131 steel (ČSN 14 220) with a diameter of 26 milimeters. The safety wrench will be made by doublecrank press GTX-300H. Production will be done in three operations.
22

Výroba uzavřené matice objemovým tvářením / Bulk forming technology of cover nut

Dušek, Otakar January 2014 (has links)
The diploma thesis suggests a producing plan of the cover nut using cold forming technology. The component will be made of the structural steel 11 320 5R. Size of its assumed annual production is 800 000 pieces. The best option was chosen from four suggested production versions. A wire with a diameter of 13.2 mm was designed as a semi-product. The component will be made in four forming operations. Roll forming machine TPM 8 (produced by Šmeral Brno) with a nominal force of 1000 kN was elected for the proposed manufacturing technology. Drawing documentation was elaborated, which includes drawing of the rolling tool assembly and drawing of tools for 3rd operation (backward extrusion). The results of the economic evaluation shows that the production cost of one nut is 1 CZK.
23

Analysis of parametric gaits and control of non-parametric gaits of snake robots / ヘビ型ロボットのパラメトリックな運動の解析およびノンパラメトリックな運動の制御

Ryo, Ariizumi 23 March 2015 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第18942号 / 工博第3984号 / 新制||工||1614(附属図書館) / 31893 / 京都大学大学院工学研究科機械理工学専攻 / (主査)教授 松野 文俊, 教授 椹木 哲夫, 教授 藤本 健治 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
24

Comparative Mapping of QTLs Affecting Oil Content, Oil Composition, and other Agronomically Important Traits in Oat (Avena sativa L.)

Hizbai, Biniam T. 01 November 2012 (has links)
Groat oil content and composition are important quality traits in oats (Avena sativa L). These traits are controlled by many genes with additive effects. The chromosomal regions containing these genes, known as quantitative trait loci (QTL), can be discovered through their close association with markers. This study investigated total oil content and fatty acid components in an oat breeding population derived from a cross between high oil ('Dal') and low oil ('Exeter') parents. A genetic map consisting of 475 DArT (Diversity Array Technology) markers spanning 1271.8 cM across 40 linkage groups was constructed. QTL analysis for groat oil content and composition was conducted using grain samples grown at Aberdeen, ID in 1997. QTL analysis for multiple agronomic traits was also conducted using data collected from hill plots and field plots in Ottawa, ON in 2010. QTLs for oil content, palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1), linoleic acid (18:2) and linolenic acid (18:3) were identified. Two of the QTLs associated with oil content were also associated with all of the fatty acids examined in this study, and most oil-related QTL showed similar patterns of effect on the fatty acid profile. These results suggest the presence of pleiotropic effects on oil-related traits through influences at specific nodes of the oil synthesis pathway. In addition, 12 QTL-associated markers (likely representing nine unique regions) were associated with plant height, heading date, lodging, and protein content. The results of this study will provide information for molecular breeding as well as insight into the genetic mechanisms controlling oil biosynthesis in oat.
25

Gest?o das Telecomunica??es em uma Organiza??o de Telem?tica do Ex?rcito Brasileiro / Administration from the Telecommunications in an Organization of Telem?tica of the Brazilian Army

Mendes, Francisco Coelho 08 November 2005 (has links)
Made available in DSpace on 2016-04-28T20:19:07Z (GMT). No. of bitstreams: 1 2005-Francisco Coelho Mendes.pdf: 1286352 bytes, checksum: 7ae61c6525a08b92ab3c07d6c04e5716 (MD5) Previous issue date: 2005-11-08 / This study attend the administration from the system of telecommunications in a Public Organization of Telem?tica. It was object from the present study the 2nd Center of Telem?tica of Area (2nd CTA), Organization of the Brazilian Army based in the City of Rio de Janeiro, that acts in States Rio de Janeiro and Esp?rito Santo rendering services of telecommunications and informatics. This research was elaborated in two parts: a documental and another of field. The first was constituted of bibliographical consultations including information in national extent about telecommunications in Brazil, administration heading for the excellence, analysis and improvement of processes, as well as the paper of 2nd CTA in the services rendered of telecommunications. Second based on field research that had as specific objectives to analyze the processes and methods of work of the Organization and to identify information seeking to analyze the importance and the viability of the Integrated Net of Telecommunications of the Army (RITEx), managed by 2nd CTA. This part from the work consisted of the elaboration and application of questionnaires, with grounds in YIN (2001) and Alves-Mazzoti & Gewandsznajder (1998), applied to person of 2nd CTA and from the Command 1st RM. The information were analyzed using the program of statistical analysis of information SPSS, where the reached results verify the viability of maintaining a private net of telecommunications, and also the viability of the administration from the work processes adopted, needing some changes and innovations in the processes of the telecommunications of the Organization in study. This research proposes some improvements, as the technological innovation, specific trainings, capacity to adapt, cultural and political change of organizational integration. This study shows that is through an administration heading for the excellence that can reach the readiness of the service and efficient attendance to the customer. / Este estudo trata da gest?o do sistema de telecomunica??es em uma Organiza??o P?blica de Telem?tica. Foi objeto do presente estudo o 2? Centro de Telem?tica de ?rea (2? CTA), Organiza??o do Ex?rcito Brasileiro sediada na Cidade do Rio de Janeiro, que atua nos Estados do Rio de Janeiro e Esp?rito Santo prestando servi?os de telecomunica??es e inform?tica. Esta pesquisa foi elaborada em duas partes: uma documental e outra de campo. A primeira se constituiu de consultas bibliogr?ficas abrangendo informa??es em ?mbito nacional sobre telecomunica??es no Brasil, gest?o rumo ? excel?ncia, an?lise e melhoria de processos, bem como o papel do 2? CTA na presta??o de servi?os de telecomunica??es. A segunda baseou-se em pesquisa de campo que teve como objetivos espec?ficos analisar os processos e m?todos de trabalho da Organiza??o e identificar informa??es visando analisar a import?ncia e a viabilidade da Rede Integrada de Telecomunica??es do Ex?rcito (RITEx), gerenciada pelo 2? CTA. Esta parte do trabalho constou da elabora??o e aplica??o de question?rios, com base em YIN (2001) e Alves- Mazzoti & Gewandsznajder (1998), aplicados a integrantes do 2? CTA e do Comando da 1? RM. Os dados foram analisados usando o programa de an?lise estat?stica de dados SPSS, onde os resultados alcan?ados constatam a viabilidade de se manter uma rede privativa de telecomunica??es, e tamb?m a viabilidade da gest?o dos processos de trabalho adotados, necessitando de algumas mudan?as e inova??es nos processos das telecomunica??es da Organiza??o em estudo. Esta pesquisa prop?e algumas melhorias, quanto a inova??o tecnol?gica, treinamentos espec?ficos, capacidade de adaptar-se, mudan?a cultural e pol?tica de integra??o organizacional. Este estudo mostra que ? atrav?s de uma gest?o rumo ? excel?ncia que se pode alcan?ar a presteza do atendimento e assist?ncia eficiente ao cliente.
26

Comparative Mapping of QTLs Affecting Oil Content, Oil Composition, and other Agronomically Important Traits in Oat (Avena sativa L.)

Hizbai, Biniam T. 01 November 2012 (has links)
Groat oil content and composition are important quality traits in oats (Avena sativa L). These traits are controlled by many genes with additive effects. The chromosomal regions containing these genes, known as quantitative trait loci (QTL), can be discovered through their close association with markers. This study investigated total oil content and fatty acid components in an oat breeding population derived from a cross between high oil ('Dal') and low oil ('Exeter') parents. A genetic map consisting of 475 DArT (Diversity Array Technology) markers spanning 1271.8 cM across 40 linkage groups was constructed. QTL analysis for groat oil content and composition was conducted using grain samples grown at Aberdeen, ID in 1997. QTL analysis for multiple agronomic traits was also conducted using data collected from hill plots and field plots in Ottawa, ON in 2010. QTLs for oil content, palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1), linoleic acid (18:2) and linolenic acid (18:3) were identified. Two of the QTLs associated with oil content were also associated with all of the fatty acids examined in this study, and most oil-related QTL showed similar patterns of effect on the fatty acid profile. These results suggest the presence of pleiotropic effects on oil-related traits through influences at specific nodes of the oil synthesis pathway. In addition, 12 QTL-associated markers (likely representing nine unique regions) were associated with plant height, heading date, lodging, and protein content. The results of this study will provide information for molecular breeding as well as insight into the genetic mechanisms controlling oil biosynthesis in oat.
27

Effect of mechanical behaviour of artificial turf on player-surface interaction in soccer

El Kati, Rene January 2012 (has links)
This study aimed to extend the knowledge on player and surface loading by contributing new data in relation to a greater range of movements, relevant in-game scenarios and on carefully controlled third generation artificial turf surfaces. This was done by selecting soccer relevant movements and in-game scenarios for a player movement study with the help of a player focus group and questionnaire. Furthermore, four surfaces were created with surface hardness and rotational traction values at the upper and lower limits of the standards set by FIFA. The study showed that both the surface hardness and rotational traction properties can affect the human movement dynamics, though these effects were mainly present during the stop and turn manoeuvre. During the stop and turn manoeuvre the soft and high traction surfaces conditions led to increased frontal plane moments as well as increased average ground reaction forces during mid-stance. In combination with decreased ground contact times it appeared that the players were able to decelerate / accelerate faster and generate a larger force on the soft and high traction surfaces. During peak push off it appeared that the players were able to generate a larger force on the hard surfaces, which also led to a significant increase in plantar flexion moment. While some parameters showed an effect for surface hardness and / or rotational traction across all four surface conditions, for others such as the knee valgus, hip extension and hip internal rotation moment showed only a significant effect between two of the four surfaces. At the same time the other surfaces showed either no effect or the opposite effect. This suggests that the effects of the surface hardness can be influenced by the rotational traction properties, and vice versa. Regarding the jumping / heading manoeuvre the effects of the surface conditions were limited. This may have been related to the high demands of the movement, or to limitations of the mechanical measurement methods. In addition to the effects of surface properties on human movement dynamics the study also showed that the mechanical measurement methods may not be representative of the human loading. The impact force conditions of the advanced artificial athlete were substantially different to that of the stop and turn and jumping / heading manoeuvre. Whereas for the rotational traction test the study showed that the rotation of the foot during the ST was substantially less than the minimum 45° required by the FIFA guidelines. Regarding the inclusion of in-game scenarios the study showed that both the simulated opponent used for the stop and turn manoeuvre, and heading a ball during a maximal vertical stop jump manoeuvre can affect the human movement dynamics. During the stop and turn with a simulated opponent the frontal plane moments in the lower limbs were significantly increased. However, this increase in joint loading could not be related to any changes in movement strategy. During the landing after heading a ball during a maximal vertical stop jump the players used a different landing strategy by landing in a more upright position and increasing the ankle plantar flexion ankle just before lading. This allowed for a larger change in the ankle plantar / dorsi flexion angle to absorb the impact of the landing. In addition to this, the heading manoeuvre also led to a significant increase in the frontal plane joint moments of the lower limbs. For future studies it is recommended that a combination of surface properties is used to gain insight into how these affect each other regarding the effects they have on human movement dynamics. In addition, they should provide detailed information on the surface design as well as the properties. Regarding the quantification of the properties it is recommended that in addition to industry standards the surfaces are also quantified using conditions closer to those expected within the study. It is also recommended that future studies incorporate in-game scenarios in order to gain more insight into the effects of interventions that simulate actual match situations.
28

Comparative Mapping of QTLs Affecting Oil Content, Oil Composition, and other Agronomically Important Traits in Oat (Avena sativa L.)

Hizbai, Biniam T. January 2012 (has links)
Groat oil content and composition are important quality traits in oats (Avena sativa L). These traits are controlled by many genes with additive effects. The chromosomal regions containing these genes, known as quantitative trait loci (QTL), can be discovered through their close association with markers. This study investigated total oil content and fatty acid components in an oat breeding population derived from a cross between high oil ('Dal') and low oil ('Exeter') parents. A genetic map consisting of 475 DArT (Diversity Array Technology) markers spanning 1271.8 cM across 40 linkage groups was constructed. QTL analysis for groat oil content and composition was conducted using grain samples grown at Aberdeen, ID in 1997. QTL analysis for multiple agronomic traits was also conducted using data collected from hill plots and field plots in Ottawa, ON in 2010. QTLs for oil content, palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1), linoleic acid (18:2) and linolenic acid (18:3) were identified. Two of the QTLs associated with oil content were also associated with all of the fatty acids examined in this study, and most oil-related QTL showed similar patterns of effect on the fatty acid profile. These results suggest the presence of pleiotropic effects on oil-related traits through influences at specific nodes of the oil synthesis pathway. In addition, 12 QTL-associated markers (likely representing nine unique regions) were associated with plant height, heading date, lodging, and protein content. The results of this study will provide information for molecular breeding as well as insight into the genetic mechanisms controlling oil biosynthesis in oat.
29

Výroba spojovacího čepu objemovým tvářením / Bulk forming technology of connecting pin

Koukal, Vojtěch January 2014 (has links)
The project of master’s thesis elaborated within engineering studies of engineering technology deals with concept of manufacturing procedure of connecting pin made of steel 11 320 5R with cold forming. Two variants of production technique were projected based on the literature study of the cold heading and cold extrusion. Selected variant, for which the technological calculation was accomplished, consists of five forming operations. Manufacture was projected for multistage automatic forming machine TPM 8-A made by manufacturer Šmeral Brno with nominal forming force 1000 kN. Tool steel 19 436 was chosen as a material of extrusion and heading tools.
30

Drivers’ reliance on lane keeping assistance systems as a function of the level of assistance

Popken, Anke 28 April 2010 (has links) (PDF)
Fahrerassistenzsysteme werden zunehmend in Fahrzeuge eingebaut mit dem Ziel, den Fahrer beim Fahren zu unterstützen, Fahrfehler zu vermeiden und damit die Fahrsicherheit zu erhöhen. Derzeit sind häufig Systeme im Einsatz, die den Fahrer vor bestimmten Sicherheitsrisiken warnen (z.B. vor einem unbeabsichtigten Verlassen der Fahrspur). Der Trend geht aber hin zu Systemen, die stärker ins Fahrgeschehen eingreifen und somit Teile der Fahraufgabe automatisieren (z.B. selbständig die Spurhaltung des Fahrzeugs übernehmen). Aus der Forschung zur Mensch-Maschine Interaktion ist jedoch bekannt, dass Automatisierung nicht zwangsläufig zur Erhöhung von Sicherheit führt, sondern dass sie vielmehr auch unerwünschte Nebeneffekte für Performanz und Sicherheit mit sich bringen kann in dem Maße, wie Menschen an die veränderten Aufgabenanforderungen adaptieren. Im Straßenverkehr wird insbesondere befürchtet, dass Fahrer sich zu stark auf Fahrerassistenzsysteme verlassen, sich teilweise aus der Fahraufgabe zurückziehen („abschalten“) und ihre Aufmerksamkeit fahrfremden Dingen widmen. Dies kann unter Umständen dazu führen, dass Fahrer im Falle von Systemfehlern oder –ausfällen nicht mehr in der Lage sind rechtzeitig und angemessen einzugreifen bzw. die Kontrolle über das Fahrzeug zu übernehmen. Ziel der Dissertation war es zu untersuchen, inwieweit sich die Involviertheit von Fahrern in die Fahraufgabe verändert je stärker sie durch ein Assistenzsystem unterstützt werden (d.h., je stärker das System Teile der Fahraufgabe automatisiert). Um dies zu untersuchen wurden zwei theoretische Konzepte herangezogen: a) das Verlassen der Fahrer (auf ein System) und b) das Situationsbewusstsein der Fahrer. Basierend auf einer umfassenden Analyse der Forschungsliteratur zum Thema Automatisierung wurde ein theoretisches Rahmenmodell entwickelt, welches Veränderungen in der Involviertheit des Fahrers in die Fahraufgabe auf menschliche Adaptationsprozesse auf verschiedenen Ebenen zurückführt, die sich in Folge der veränderten Aufgaben­anforderungen durch zunehmende Automatisierung ergeben. Dazu zählen Veränderungen in Einstellungen, sowie in kognitiven, energetischen, und motivationalen Prozessen. Um Veränderungen in diesen Prozessen zu untersuchen, wurde eine Vielzahl an objektiven und subjektiven Maßen erhoben. Hauptgegenstand der Dissertation ist eine umfangreiche Fahrsimulatorstudie im Fahrsimulator mit Bewegungsplattform bei VTI (Swedish National Road and Transport Research Institute) in Linköping, Schweden. Dabei kamen zwei Querführungsassistenzsysteme (ein Heading Control System und ein Lane Departure Warning System) zum Einsatz, die den Fahrer in unterschiedlichem Maße bei der Spurhaltung unterstützten. Im Gegensatz zu einem Großteil der bisherigen Studien wurden prozessorientierte Performanzmaße zur Erfassung des Verlassens der Fahrer auf die Assistenzsysteme und des Situationsbewusstseins der Fahrer verwendet. Das Verlassen der Fahrer auf die Querführungsassistenzsysteme wurde durch Blickverhaltensmaße über die Bereitschaft der Fahrer erfasst, ihre visuelle Aufmerksamkeit von der Straße ab hin zu einer Zweitaufgabe im Fahrzeuginnenraum zu wenden. Zur Messung des Situationsbewusstseins der Fahrer wurden Fahrverhaltensmaße herangezogen welche als Indikator für die Schnelligkeit und Abruptheit der Reaktionen der Fahrer auf unerwartete kritische Fahrsituationen dienten. Ein Hauptbefund der Dissertation war, dass die Fahrer sich signifikant im Ausmaß ihres Verlassens auf einen hohen Grad an Assistenz unterschieden. Diese interindividuelle Varianz im Verlassen der Fahrer auf einen hohen Grad an Assistenz konnte am besten durch das Vertrauen der Fahrer in das Querführungsassistenzsystem und ihr Aktivierungsniveau erklärt werden: Je höher das Vertrauen der Fahrer in das System und je geringer ihr Aktivierungsniveau, desto stärker verließen sie sich auf das System. Individuelle Fahrermerkmale (Fahrstil) erklärten einen signifikanten Anteil der Varianz im Vertrauen der Fahrer in die Spurhalteassistenzsysteme. (ersetzt wegen neuem Herausgeber) / Advanced driver assistance systems are increasingly built in vehicles with the aim to support drivers while driving, to reduce driver errors and thereby to increase traffic safety. At present, these systems are often designed to warn drivers of specific safety risks (e.g., of an imminent departure from the driving lane). However, there is a trend towards systems that more strongly intervene in driving and that hence, automate parts of the driving task (e.g., autonomously keep the vehicle within the driving lane). However, research on human-machine interaction has shown that automation does not necessarily increase safety, but that it may also lead to unanticipated side effects on performance and safety to the extent that humans adapt to the changing task demands. A major concern in road traffic is that drivers rely too heavily on driver assistance systems, become less actively involved in the driving task, and divert their attention to things unrelated to driving. Thus, in the case of system malfunctions or failures, drivers possibly may not be prepared to intervene timely and accordingly and to regain control over the vehicle, respectively. The aim of this dissertation was to investigate changes in drivers’ active engagement in the driving task as a function of the degree to which they are supported by a driver assistance system (i.e., as a function of the degree to which the system automates the driving task). Drivers’ active task engagement was studied by referring to two theoretical concepts: a) drivers’ reliance (on a system) and b) drivers’ situation awareness. Based on an extensive review of previous research on automation, a conceptual theoretical framework was developed that links changes in operators’ active task engagement to human adaptation processes on different levels in response to the changing task demands due to automation. Among them are changes in human attitudes as well as in cognitive, motivational and energetic processes. In order to determine the relative influence of these processes, a range of objective and subjective measures was collected. The essential part of the dissertation is an extensive driving simulator study in an advanced moving-base driving simulator at VTI (Swedish National Road and Transport Research Institute) in Linköping, Sweden. Two lateral support systems (a Heading Control system and a Lane Departure Warning system) were implemented which assisted drivers to different degrees in lane keeping. Contrary to most previous automation studies, drivers’ reliance on the lane keeping assistance systems and their situation awareness were studied by using process-oriented performance-based measures. Drivers’ reliance on the lane keeping assistance systems was assessed by eye glance behaviour measures indicating drivers’ preparedness to allocate their visual attention away from the road scene to an in-vehicle secondary task. Drivers’ situation awareness was assessed by behavioural measures of the latency and magnitude of drivers’ initial reactions to unexpected critical driving situations. A major finding of the study was that drivers differed significantly in their reliance on a high level of lane keeping assistance. This interindividual variance in drivers’ reliance on higher-level assistance could be best explained by drivers’ trust in the system and their energetic arousal: The greater drivers’ trust in the system and the lower their arousal, the more did they rely on the system. Individual driver variables (driving style) explained a significant proportion of the variance in drivers’ trust in the lane keeping assistance systems. (replaced because a new publisher)

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