This paper deals with design of tool deflection compensation system for milling spindle C1, provided by company TOSHULIN, a.s. A simplified simulation model of the spindle supplemented by compensatory elements was built by using programs ANSYS, MD ADAMS, Matlab/Simulink. As action elements there were use three piezoactuators each controled by PID controler. Efficiency of this compensation system was verified based on performed simulations.

This master’s thesis deals with the design and manufacture of device for testing and verification of functionality of atmospheric resistors produced by IMI CCI Czech Republic. An atmospheric resistor, also called disk stack, is a stack of disks through which the medium flows and the system of labyrinths in disk stack causing a pressure reduction of medium. This thesis describe design of the mechanical parts of stand for atmospheric resistors, choice pneumatic circuit’s components, data acquisition hardware for measuring flow, inlet and outlet pressure, and temperature. The software was created in LabVIEW programming environment. In the end of this paper was done measurement in order to test functionality of test stand and software.

OMNeT++ is a discrete-event simulator commonly used to build various network simulations. It can be extended by INET framework that supplies models of protocols and devices from TCP/IP environment. This paper explores current capabilities of INET to model IPv6, particularly routing. Implemented extension includes modules of dual-stack router and dual-stack host that support XML-based configuration of IPv6 addressing and static routing. We also introduce an OSPFv3 module that implements most of auxiliary features and is ready for future development of the routing protocol core.

Der Kaltstart von Polymerelektrolytmembran Brennstoffzellen (PEM-BZ) stellt nach wie vor eine wesentliche Herausforderung dar. Passende Betriebsstrategien sind für Start und Shutdown von entscheidender Bedeutung um den BZ-Stack nicht irreversibel zu schädigen. Vor allem das geeignete Wassermanagement muss in den Fokus gerückt werden, da gefrierendes Reaktionswasser sowohl beim Start als auch bei der Lagerung unter Frostbedingungen die Funktionstüchtigkeit der PEMBZ beeinträchtigen können. Im Rahmen des Forschungsprojektes HZwo: InTherm wurde von der Professur Alternative Fahrzeugantriebe ein Teststand für die Untersuchung von Shutdownprozeduren und Froststarts entwickelt. Für die Feuchtemessung wurde ein Taupunkthygrometer verwendet und um die Vorgänge im Stack nachzuvollziehen drei Stromdichte- Temperaturverteilungsmessungen integriert.

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This thesis explores the procedural generation of 3D buildings from the floor plan all the way to the fa¸cade and building’s details such as doors, windows, and roof. Through this, the study explores several techniques and approaches to create different layers of the building generation pipeline. The focus is on implementing a set of algorithms that, when running sequentially, are able to create complete 3D buildings in a short time (so they can be used in online generation), could be used in any open-world game, and with a limited count of triangles per building. Furthermore, the tool provides a clear and easy-to-use interface for designers in Unity, where they can interact with the multiple parameters of each building layer, giving designers a high degree of controllability. The tool is evaluated using the resulting buildings based on different metrics and how individual changes to different parameter starting from a template affect the output of the generator in terms of the metrics and the resulting building. The result from the analysis show that the polygon mathematics is well suited for generating 3D buildings for games.

An alternative indirect integration regime of porous low-k materials was investigated. Based on a single Damascene structure the intra level dielectric SiO2 or damaged ULK was removed by using HF:H2O solutions to create free standing metal lines. The free spaces between the metal lines were refilled with a spin-on process of a low-k material. The persistence of barrier materials and copper against HF solutions, the gap fill behavior of the used spin on glass on different structure sizes and the main challenges which have to solve in the future are shown in this study.

As infrastructures and software grow in complexity the need to keep track of things becomes important. It is the job of log aggregation solutions to condense log data into a form that is easier to search, visualize, and analyze. There are many log aggregation solutions out there today with various pros and cons to fit the various types of data and architectures. This makes the choice of selecting a log aggregation solution an important one. This thesis analyzes two full-stack log aggregation solutions, Elastic stack and SigNoz, with the goal of evaluating how the ingestion and storage components of the two stacks perform with smaller and larger amounts of data. The evaluation of these solutions was done by ingesting log files of varying sizes into them while tracking their performance. These performance metrics were then analyzed to find similarities and differences. The thesis found that SigNoz featured a higher CPU usage on average, faster processing times, and lower memory usage. Elastic stack was found to do more processing and indexing on the data, requiring more memory and storage space to allow for more detailed searchability of the ingested data. This also meant that there was a larger storage space requirement for Elastic stack than SigNoz to store the ingested logs. The hope of this thesis is that these findings can be used to provide insight into the area and aid those choosing between the two solutions in making a more informed decision.

The physical and mechanical characteristics of carbon fiber reinforced polymers (CFRP) and Ti6Al4V make them widely used in the aerospace industry. The hybrid structure of CFRP/ Ti6Al4V material has been used in the new generation of aircraft manufacturing. The drilling process of these materials is often associated with unfavorable machining defects such as delamination, burr formation, reduced surface integrity, and tensile residual stresses. These machining defects are attributed to high thermal load, continuous chip morphology, and poor chips evacuation efficiency. Vibration-assisted drilling (VAD) uses an intermittent cutting process to control the uncut chip thickness and chip morphology. VAD has potential advantages include low thermal load, high chips evacuation effectiveness, and longer tool life. This thesis presents an experimental investigation into the effect of VAD machining parameters on the cutting energy, CFRP delamination, surface integrity, geometrical geometry, Ti6Al4V burr formation, induced residual stresses, and tool wear during the drilling process of CFRP, Ti6Al4V, and CFRP/Ti6Al4V stacked materials. Moreover, a kinematics model is developed to link the observed results to the independent machining parameters (i.e., cutting speed, feed rate, modulation amplitude, and modulation frequency). The experimental work covers a wide range of machining parameters using four levels of frequencies (83.3, 125, 1500, and 2150 Hz). The VAD results show up to 56 % reduction in the cutting temperature with a significant enhancement in the CFRP entry and exit delamination, geometrical accuracy, surface integrity, and burr formation. The use of VAD also generates compressive stresses, hence improving the part fatigue life. / Thesis / Doctor of Philosophy (PhD)

This is a project about reconciling the rational world of architecture with the empirical world of nature. A small retreat on the Appalachian Trail near Dragon's Tooth, this project employs two elements belonging to each of those entities. The retreat is composed of a double envelope. The exterior envelope is a wooden screen and dry stacked stone wall relating to the natural world. In contrast, the second envelope is a glass and steel box, analogous to the rationality of man. Dimensional 2x4 lumber models are employed to study the light conditions, patterns, and construction of the wooden screen. / Master of Architecture