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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.
31

Silové zatížení frézovacích nástrojů při obrábění / Force loading of milling tools during the machining process

Švec, Michal January 2020 (has links)
This thesis compares the force load of two kinds of cutting tool inserts while milling. The thesis is devided into two main parts – research and experiment. The research part is focused on the theory of the force load measuring, cutting tools and cutting tool inserts and their coating. 14 grooves were made with each cutting insert while the force load was measured. Constant cutting conditions were applied. The experiment was repeated four times for each kind of cutting insert. The aim of the thesis is to determine if both kinds of inserts mill with the same force load. The results reveal that one kind of cutting tool inserts mill with the force load higher up to 85 %.
32

Volba optimálního nástroje pro vybranou technologii obrábění / Selection of an optimal tool for the selected machining technology

Podstata, Jan January 2020 (has links)
This thesis compares the properties of four types of replaceable cutting tool inserts from different suppliers during milling. The comparative factors are cutting force, material loss of the insert and the roughness of the resulting surface. The thesis is divided into two parts - a comprehensive overview of the current state of knowledge and an experiment. The first part analyzes the load, the possibility of its measurement, surface treatment of tools, milling cutters and replaceable inserts. The experiment took the form of measuring the load during face milling, measuring the surface roughness of the machined material and measuring the material loss of the inserts on an optical strain gauge. The replaceable cutting tool inserts were compared based on the performed measurements.
33

Obrábění kalených ocelí / Machining of hardened steels

Veselý, Ondřej January 2021 (has links)
Diploma thesis on Machining hardened steels is focused on the analysis of longitudinal turning of hardened steel 14 109 by using a tool from PKNB in terms of measuring the force load using a dynamometer and then evaluating the surface quality. The theoretical part deals with the issue of turning technology, cutting materials and heat treatment of steel. In the practical part, the influence of cutting conditions on the resulting values was assessed during the experiment. Twelve samples with different combinations of cutting conditions were tested, then was selected a sample that met the criterion of combining minimum cutting forces values and surface quality. The experiment shows that force load values can be achieved twice less by combining cutting conditions with an appropriate combination.
34

Dvouválcový čtyřdobý plochý zážehový motor / Two-cylinder four stroke spark ignition flat engine

Dragoun, Jan January 2012 (has links)
This thesis deals with the possibilities for realization of the crankshaft-cylinder four-stroke gasoline engine is flat, usable in the urban vehicle. In the work described stresses exerted on the crank mechanism can balance the crankshaft, torsional stress and strength calculation method of control. In the final part of this work is outlined proposal for implementation of the crankshaft.
35

Explozivní síla v kondiční přípravě fotbalistů kategorii dorostu / Explosive power in conditioning young soccer players

Presl, Aleš January 2019 (has links)
Bibliographic identification PRESL, Aleš: Explosive power in fitness training of soccers in teengers. Diploma thesis. Charles Univerzity. Faculty of Physical Education and Sport. Department of Athletic. Supervisor: PhDr. Radim Jebavý, PhD. Prague: FTVS UK, 2019. Abstract Title: Explosive power in fitness of soccers in teengers Objectives: The main of the thesis is to determine the influence of the interventional fitness program on the development of explosive strength of the lower extremities by means of plyometric exercises in the youth category in football and its subsequent comparison in three measurements between the experimental and control group. Methods: Testing was performed using four motor tests and an intervention program with two-group plyometric exercises. 16 footballers aged 17.6 ± 0.9 took part in 3 measurements with an interval of 4 weeks. The data were processed using basic statistical methods. Results: The interventional fitness program had a positive effect on increasing the level of explosive strength in the experimental group. Due to the introductory part of TJ and 3 measurements, the control group also improved significantly. Keywords: youth category, strength abilities, lower limbs, intervention program, comparison
36

Explozivní síla v kondiční přípravě fotbalistů kategorii dorostu / Explosive power in conditioning young soccer players

Presl, Aleš January 2020 (has links)
Bibliographic identification PRESL, Aleš: Explosive power in fitness training of soccers in teengers. Diploma thesis. Charles Univerzity. Faculty of Physical Education and Sport. Department of Athletic. Supervisor: PhDr. Radim Jebavý, PhD. Prague: FTVS UK, 2019. Abstract Title: Explosive power in fitness of soccers in teengers Objectives: The main of the thesis is to determine the influence of the interventional fitness program on the development of explosive strength of the lower extremities by means of plyometric exercises in the youth category in football and its subsequent comparison in three measurements between the experimental and control group. Methods: Testing was performed using four motor tests and an intervention program with two-group plyometric exercises. 16 footballers aged 17.6 ± 0.9 took part in 3 measurements with an interval of 4 weeks. The data were processed using basic statistical methods. Results: The interventional fitness program had a positive effect on increasing the level of explosive strength in the experimental group. Due to the introductory part of TJ and 3 measurements, the control group also improved significantly. Keywords: youth category, strength abilities, lower limbs, intervention program, comparison
37

Vliv zimního přípravného období na explozivní sílu u amatérských fotbalistů / The effect of the winter preparation period torwards the explosive power in amateur football players

Bébr, Milan January 2021 (has links)
Title The effect of the winter preparation period torwards the explosive power in amateur football players Objectives To find out what efect has preparation period on explosive power of lower limbs at football players of the regional championship level. Methods Quantitative research was held as a motorical testing of football team Sokol Kolovraty (n = 20) during winter preparation period. To determine the development of explosive power of the lower limbs was selected 5 motoric tests: High jump from the spot, Four jump from foot to foot, Long jump from the spot, Triple jump on the left (right) leg, Deep forward bend in standing position. This study was so-called "cross over" study, or as crossover study in which the team was divided by randomization info two groups, group A and a group B. The first half of the study (4 weeks) the group A performer strength intervention and the group B a different running intervention. In the middle of the research, after control measurements, the group exchanged their intervetnions. Results Based on the Mix-design ANOVA I can state the results showed the statistical significance of strength intervention compared to running intervention without strength exercise. In all test fot the explosive power of the lowe limbs the positive changes occurred during the strength...
38

Studium účinků pasivních silových složek řezání na obráběný povrch / An Experimental Study of the Impact of Passive Forces of Cutting on a Machined Surface

Slaný, Martin January 2013 (has links)
This dissertation thesis focuses on the evaluation of modern machine tools, especially tools for finishing operations, with which the effect of the passive force components on the machining process is evaluated. The thesis will examine the analysis of creating chips and circumstances that accompany this process and substantially involve the formation of a new surface. The analysis of the process of the recording of the power load of the MT3 tool takes place in the experimental part of the thesis. MT3 is a reaming head intended for finishing holes at high cutting speeds (100-200 m.min-1) with removal of small cross section AD (0.024 mm2) chips. Particular attention is paid to the newly created profile from the surface after machining and evaluation of changes in geometry and loading of the cutting edge, which is significantly reflected in the establishment and the development of passive forces.
39

K diskurzivní tvorbě normových autorit na německých školách a její vliv na formování spisovné němčiny / On the Discursive Constitution of Language Norm Authorithies in German Schools and Their Influence on the Creation of the Standard Variety

Horbank, Olivia Josephine January 2014 (has links)
This master thesis analyzes the question, how norm authority constitutes itself in the context of school education. It is based on firsthand data from several adio- and audiovisual recordings of classes in two German schools (trade school and high school). The project provides a description of the mechanism by which the teacher establishes himself as the norm-authority and how he is able to assert this authority towards the student, the norm subject. At the same time, the reaction of the norm subjects towards the intervention of the norm authority into their language production is analyzed. Theoretically, the essay is embedded in the social force field of a standard-variety ("soziales Kräftefeld einer Standardvarietät") by Ulrich Ammon and the language management theory. By following the steps of the language management process, the handling of the language norm is described and an analysis is made of how language norms are actively adopted into the learning process. The analysis and evaluation of the class recordings underline the dynamic character of language norms and show the procedural nature of norm formation and their adoption. Key Words: norm, variety, social force field, language management, macro and micro level, norm authority, norm subject
40

Kondiční příprava mimo led A týmu HC Rytíři Kladno v sezóně 2012/2013 / Off-ice fitness training of HC Rytíři Kladno A team in season 2012/2013

Hanzlík, Petr January 2014 (has links)
UNIVERZITA KARLOVA V PRAZE Fakulta tělesné výchovy a sportu DIPLOMOVÁ PRÁCE 2014 Petr Hanzlík UNIVERZITA KARLOVA V PRAZE Fakulta tělesné výchovy a sportu Diplomová práce Kondiční příprava mimo led A týmu HC Rytíři Kladno v sezóně 2012/2013 Vedoucí diplomové práce: Zpracoval: PhDr. Radim Jebavý, Ph.D. Bc. Petr Hanzlík srpen 2014 Prohlašuji, že jsem tuto diplomovou práci vypracoval samostatně a pouze za použití uvedené literatury. .….….….……….. Petr Hanzlík Touto cestou bych chtěl poděkovat PhDr. Radimovi Jebavému, Ph.D. za cenné rady, odborné připomínky a vedení diplomové práce. Dále bych chtěl poděkovat PhDr. Zdeňku Vojtovi za možnost podílet se na tréninkovém procesu a měření hráčů A mužstva HC rytíři Kladno. Rád bych také poděkoval Mgr. Miroslavě Zimové za pomoc při tvorbě a úpravách této práce a v neposlední řadě všem kladenským hráčům sezony 2012/2013 za jejich obětavou pomoc při realizaci a měření. Svoluji k zapůjčení této diplomové práce ke studijním účelům. Prosím, aby byla vedena přesná evidence vypůjčovatelů, kteří musí pramen převzaté literatury správně citovat. Jméno a příjmení: Číslo OP: Datum vypůjčení: Poznámka: … … … … … … … … … … … … … … … … … … … … … … … … Abstrakt Název: Kondiční příprava mimo led A týmu HC Rytíři Kladno v sezóně 2012/2013 Cíle práce: Analyzovat a porovnat kondiční...

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