National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Simulation of a temperature field of the FDM printhead
Rousek, Jakub ; Dvořák, Jaromír (referee) ; Zemčík, Oskar (advisor)
The aim of this thesis is to analyze the thermal behaviour of the printhead used on RepRap 3D printers. The main focus was on heatbreak zone, where are located important processes in terms of softening and melting of materiál. For choosed printheads is looked at effect of their design on the temperature profile and lenght of thermoplastic transition phase. For the purpose of simulations, 3D models were created using CAD system. These models were then used as vase for the simulation models of temperature distribution and spreading. The prinhead used for CR10 printer reach significantly worse result of heat distribution in heatbreak for model with bolt attachment between heat block and heatsink. This attachment is increasing temperature at the bottom of of heatsink and also increasing length of transition zone. The same attachment is look at for the second type of printhead – A10M. Here is difference less noticable. The heat transfer by attachment bolts is compenzated by reducing thickness of wall in the heatbreaks. For the printhead type diamond was deemed necessery usage of insulation materiál between heat block and rst of the components. Insufficient insulation is increasing risk of clogging and thermal damage to construction supporting fan.
Dechová rehabilitace u pacientů operovaných pro spontánní pneumothorax
DOLANSKÝ, Petr
This bachelor thesis deals with the issue of respiratory therapy after surgical treatment of spontaneous pneumothorax. Pneumothorax is defined as the presence of air or other gas in the pleural cavity. Patients experience high dyspnea, soreness, decreased respiratory parameters and changes in posture. The aim of the work was to map the possibility of respiratory rehabilitation in patients operated for spontaneous pneumothorax and to propose a procedure for respiratory rehabilitation in these patients. The theoretical part briefly describes the anatomy of the chest, describes the primary and auxiliary inspiratory and expiratory muscles. Furthermore, the problem of pneumothorax, its division, diagnosis, symptomatology, conservative and surgical treatment are described. At the end, the breathing rehabilitation techniques and other physiotherapeutic concepts, that can be used in patients after spontaneous pneumothorax surgery, are discussed. The practical part had been done in the form of qualitative research, in which three patients that were operated for spontaneous pneumothorax participated. Kinesiological examination took place the first day after the surgery. It consisted of the muscle test according to Janda, goniometric measurement of active range of motion in shoulder joint, anthropometric measurment of chest development, measurement of maximum inspiratory pressures using a Micro RPM, Borg's CR10 scale and measurement of hemoglobin oxygen saturation. In the following days, the therapy itself took place, ending with a final kinesiological examination. The measured values were compared with each other. Improvements were achieved in all probands, so it can be argued that the therapy had a positive effect.
Simulation of a temperature field of the FDM printhead
Rousek, Jakub ; Dvořák, Jaromír (referee) ; Zemčík, Oskar (advisor)
The aim of this thesis is to analyze the thermal behaviour of the printhead used on RepRap 3D printers. The main focus was on heatbreak zone, where are located important processes in terms of softening and melting of materiál. For choosed printheads is looked at effect of their design on the temperature profile and lenght of thermoplastic transition phase. For the purpose of simulations, 3D models were created using CAD system. These models were then used as vase for the simulation models of temperature distribution and spreading. The prinhead used for CR10 printer reach significantly worse result of heat distribution in heatbreak for model with bolt attachment between heat block and heatsink. This attachment is increasing temperature at the bottom of of heatsink and also increasing length of transition zone. The same attachment is look at for the second type of printhead – A10M. Here is difference less noticable. The heat transfer by attachment bolts is compenzated by reducing thickness of wall in the heatbreaks. For the printhead type diamond was deemed necessery usage of insulation materiál between heat block and rst of the components. Insufficient insulation is increasing risk of clogging and thermal damage to construction supporting fan.

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