|
|
On The Analyse of High Productive Reaming Technology
Gashkova, Irina ; Slaný, Martin (referee) ; Píška, Miroslav (advisor)
Diplomová práce se zabývá analýzou technologie vysoceproduktivního vystružování. V rámci práce byly provedeny testy vystružování za různých technologických podmínek (vc=40, 60, 80, 100 m/min; f=0.2, 0.4, 0.6, 0.8 mm) na materiálu austenitické oceli DIN 1.4404 při použití vystružovací hlavicí MT3. Jednotlivé operace vystružování byly porovnány z hlediska parametrů jako tlačná síla, krouticí moment, výsledná drsnost obrobeného povrchu a dále z hlediska tvaru třísky. Následně byly vypočítány průměrné hodnoty a směrodatná odchylka naměřených parametrů. Dále bylo provedeno porovnání pomocí diagramů. Výsledky ukazují lepší kvalitu, nižší drsnost povrchu (Ra 0,37 µm) a méně zdeformovanou třísku při pomalejších řezných rychlostech (40 m/min) a menším posuvu na otáčku (0,2 mm). Výsledky také ukazují nárůst tlačné síly a krouticího momentu za uvedených technologických podmínek. Při zvyšující se řezné rychlosti vystružování tyto silové účinky klesají.
|
|
| |
|
|
Determination of selected perfluoroalkyl compounds in complex matrices
Ondreášová, Klára ; Vávrová, Milada (referee) ; Mgr. Petra Kosubová, Ph.D (advisor)
Diploma work focuses on the determination of selected representatives of perfluoroalkyl substances in complex matrices, particularly, in sewage sludge and feed. In case of sewage sludge, samples were extracted into methanol and three extractions techniques were compared: accelerated Soxhlet, pressurized liquid extraction and Powley method. Powley method showed sufficient efficiency, the lowest matrix effect and minimal background. Perfluorooctane sulfonate was present in all tested samples of sewage sludge (0.74–38.02 ng.g-1). Other detected compounds were perfluorodecanoic acid and perfluorooctanoic acid. Three extraction techniques were tested on feed samples (QuEChERS, fast methanol extraction and Powley method into acetonitrile). Powley method provided the cleanest extracts and showed simultaneously the highest recovery of native perfluoroalkyl substances and the lowest matrix effects. Perfluorooctane sulfonate and perfluorooctanoic acid were rarely present in samples of complete and supplemental feeds, while other perfluoroalkyl substances were found at levels below limit of quantification or they were not detected at all. Perfluorooctane sulfonate (0.100–2.768 ng.g-1), perfluoroundecanoic acid and perfluorotridecanoic acid were determined in all fish meal samples.
|
|
|
Milling Machine for Machining of Plastics
Frejlich, Tomáš ; Brada, Michal (referee) ; Brandejs, Jan (advisor)
Bachelor thesis deals with the structural design of the longitudinal and transverse feed for the milling of embedded hollow fibers of fixed size used in heat exchangers and the design of these components during milling. The work contains a brief description of the routing, basic milling division and a brief overview of the kinds of lines that are use for machine tools. It als presents an overview of fastenings for easy and quick clamping of milling, individual design variations and optimal solution. The works also includes the drawing of the components and complete set. The results of the Bachelor thesis are used for the Laboratory heat transfer and flow at University of Technology, Faculty of Mechanical Engineering.
|
|
|
Friction and air feeders for paper sheets
Svoboda, Ondřej ; Košťál, David (referee) ; Brandejs, Jan (advisor)
The thesis is focused on summarizing the evidence on the issue of paper sheets feeding at the final processing of documents. The thesis includes dividing of paper feeders, their characterization, and description of friction and air feeders, which are most widespread. As a model for the description methods of sheets feeding were used machinery CFM 700 and GPM 540A of Cyklos company. The thesis also compares friction and air feeding from the constructional point of view. The conclusion focuses on the new methods in the paper feeding in future.
|
|
|
Calculation of column destillation unit.
Bytešník, Jan ; Jecha, David (referee) ; Jícha, Jaroslav (advisor)
The bachelor's thesis is divided into three main parts. The first part discusses principles and theoretical base of the distillation process. The majority part of this thesis includes solution of elementar steps towards the resultant parameters of the distillation column. This results may be served like input parameters during other calculations, which can make an effective optimalization of the distillation column for the practical use. The last part of bachelor's thesis compares results of the second part with results, which was generated by ChemCAD aplication with the same input numerical values.
|
|
|
Development of technologies for feeding cattle in the past 50 years
SLAVÍK, Roman
Bachelor thesis is focused on the technology used for feeding cattle for after - recent 50 years. The aim is to evaluate the technical development of this technique. There are also mentioned physiological requirements for cattle. Category cattle and their nutrition. Further comprehensively evaluated using the food. There are mentioned machines which are used for cleaning, processing, production and silage to the feed trough. Part of the work deals with agrotechnical requirements mentioned machines. These requirements followed by appropriate selection of the feed technique. The last chapter deals with the development of feeding chosen. In conclusion evaluates tech-nological progress in the development of feeding.
|
|
|
RSS reader application for iOS
Nováček, Stanislav ; Vojíř, Stanislav (advisor) ; Hradil, Jiří (referee)
The aim of this thesis is to develop an iOS application, an RSS reader mobile application with some social aspects and it's publication on the App Store. This thesis can also serve as inspiration when creating similar applications for iOS devices and enclosed source code can also serve as a practical study material. There are two parts of this thesis - the theoretical part and the practical part. In the theoretical part, the reader is provided with an overview of mobile development and mobile platforms. Moreover, there are mentioned new features of iOS 8, things needed for iOS development, a brief overview of Objective-C and Swift programming languages and web syndication and RSS & Atom formats characterized. In the practical part, there is the development of the RSS reader application which is based on using Feedly cloud services. Next there is a description of the features and functionality, the user interface, some topics of implementation are tackled and there is a list of third party libraries that are used in the application. Some marketing strategies and support is described in the last few pharagraphs of this part of the thesis.
|
|
|
Fundamental aspects of performance horse nutrition
PROCHÁZKOVÁ, Kamila
The main aim of this thesis is to create literary study and evaluace fundamental aspects of horse nutrition. The thesis deals with physiology of digestion, muscle metabolism and energy needs of performance horses. It analyzes feed and techniques used for equine nutrition. The thesis describes significance of individual nutrients, minerals and vitamins, their digestability and utilization by the body and proportional respiration in the feeding dosage.
|
|
|
Nutritive value determination of granular feed mixtures for dogs
ZNOJ NOVOTNÁ, Barbora
The aim of this thesis was evaluate the nutritive value of complete granulated dry food for adult dogs in normal activity. 17 dry feeds were choosen with regard to quality classes - 7 superpremium, 5 premium and 5 economy. Content of moisture, crude protein, crude fat, crude fibre, crude ash were determined in laboratory and NFE (nitrogen-free extracts - carbohydrates) and metabolizable energy were determined by calculations. The results of the analysis were compared with figures stated on the packaging of the feed. Quality classes were compared with each other. It was found that 12 from 17 feeds exceeded the tolerance limites for declarated nutrients. Not all of the feeds on the market is suitable for the dogs and an appellation superpremium isn't guarantee of good quality.
|
guest ::
