Monitoring of gauges stability in calibration laboratory

Bakalářská práce se zaměřuje na stanovení postupu pro sledování stability měřidel v kalibrační laboratoři výrobního podniku. Tento postup je následně aplikován na vybraná měřidla – mikrometr, výškoměr a multimetr. Práce je založená na jednotné terminologii vycházející z mezinárodního metrologického slovníku. Dále jsou zde popsány vlivy ovlivňující měření, metody vyhodnocování nejistot měření a způsobilost měřicích procesů.This bachelor thesis focuses on setting a procedure of monitoring gauges stability in calibration laboratory. This procedure is applied on selected gauges – micrometer, height gauge and multimeter. The thesis is based on official terminology of the International Vocabulary of Metrology. Furthermore, it describes ambient impacts on measurements, measurement uncertainly and capability of measuring

Scaling slowly rotating asteroids with stellar occultations

Context. As evidenced by recent survey results, the majority of asteroids are slow rotators (spin periods longer than 12 h), but lack spin and shape models because of selection bias. This bias is skewing our overall understanding of the spins, shapes, and sizes of asteroids, as well as of their other properties. Also, diameter determinations for large (>60 km) and medium-sized asteroids (between 30 and 60 km) often vary by over 30% for multiple reasons. Aims. Our long-term project is focused on a few tens of slow rotators with periods of up to 60 h. We aim to obtain their full light curves and reconstruct their spins and shapes. We also precisely scale the models, typically with an accuracy of a few percent. Methods. We used wide sets of dense light curves for spin and shape reconstructions via light-curve inversion. Precisely scaling them with thermal data was not possible here because of poor infrared datasets: large bodies tend to saturate in WISE mission detectors. Therefore, we recently also launched a special campaign among stellar occultation observers, both in order to scale these models and to verify the shape solutions, often allowing us to break the mirror pole ambiguity. Results. The presented scheme resulted in shape models for 16 slow rotators, most of them for the first time. Fitting them to chords from stellar occultation timings resolved previous inconsistencies in size determinations. For around half of the targets, this fitting also allowed us to identify a clearly preferred pole solution from the pair of two mirror pole solutions, thus removing the ambiguity inherent to light-curve inversion. We also address the influence of the uncertainty of the shape models on the derived diameters. Conclusions. Overall, our project has already provided reliable models for around 50 slow rotators. Such well-determined and scaled asteroid shapes will, for example, constitute a solid basis for precise density determinations when coupled with mass information. Spin and shape models in general continue to fill the gaps caused by various biases

Historický vývoj a vegetační změny nivy dolního úseku řeky Labe

This work has been divided into two main sections theoretical and research sections. The theoretical section focuses on the bases for the studied issue. It mainly defines a floodplain and wider space of a river and presents development of recognition of processes, which we refer to as vegetation development and dynamics. These range from the theory of plant succession to vegetation succession in view of the significantly distributed environment. And it also shows how a one-sided view of the effect of a river on vegetation with recognition changed only after the biogemorphic approach, when all described parts are mutually related. Today no one will be surprised that vegetation also influences geomorphic processes, such as erosion and sedimentation, and that this view of the issue has been through its own development. The next part of the work presents the monitored territory and characterises natural phenomena, such as geomorphology, geology, hydrology and selected environmental characteristics (potential vegetation, climate, phytocelonology and phytogeography). It also summarises all available botanical data regarding the territory and familiarises the reader with the history and current status of botanical research. The final part of the work presents known changes which have occurred in the floodplain in the recent period (over several centuries). These mainly include changes in the manifestation of the river, indicated by changed oscillation of the water level, adjustments to the river bed and floodplain as such, along with pollution and eutrophisation of the river, a change to generic class (entry of neophytes and plant invasion) and a change to floodplain management. The research section is divided into four parts, which correspond to published or soon-to-be-published articles. The first collects all available data about historical species composition, compares them with the current situation and tries to put them into context with the changes that have occurred and area occurring in the floodplain. The second (and from my point of view crucial) part is based on long-term collection of data at permanent monitoring points. A large number of collected images (more than 700) include a large amount of information about the current composition of vegetation and make it possible to compare year-to-year changes, put them into context with changes in monitored abiotic factors and estimate the frequency of the processes that occur on gravel days. The third part focuses on the Corrigiola litoralis, known by its common name strapwort, which, as has already been stated in the introduction, is a critically endangered species and is also very characteristic for the studied groups. This part attempts if possible to present in the most effective way this species, its biology and changes in its population and to identify potential threats as well as opportunities. The fourth final part attempts to show other options for examination of vegetation changes. It uses the resources of geographical information systems. It presents examples of how the river flow in a relatively short period of time in a "little regulated" part has changed and how vegetation reacts to it. It uses both historical map data and modern aerial shots adjusted to orthophotographs

Process management in a manufacturing enterprise

The aim of this diploma thesis, which is divided into three chapters, is to find out what is the perception of efficiency in the company by employees, what activities most often cause the delay of deliveries to customers and how the facts could contribute to improvement. In the first part the reader is acquainted with the most important terminology related to project management of companies, such as definition of project, division of projects, process mapping, process improvement and others. In the second part the tasks of selected departments in companies such as the department of business, design department, purchasing department, production planning and quality management are explained on the theoretical level. The practical part builds on the theoretical part and is applied to the Faiveley Transport company involved in the production of components in the railway industry. Its aim is first to use the company materials to clarify the process from the receipt of the order until its dispatch within the aforementioned departments. At the end of the diploma thesis it is explained, using the interviews with the employees of the company and distributed surveys, how employees perceive the efficiency in the company and what are the most common causes of the delay of deliveries to the final customer. Finally, it suggests what measures could be implemented to eliminate the activities that delay the dispatch of products to the target customer and, consequently, his dissatisfaction.Cílem této diplomové práce, která je rozdělena do tří kapitol, je zjistit, jaké je vnímání efektivity ve firmě ze strany zaměstnanců, jaké činnosti nejčastěji způsobují zpoždění dodávek zákazníkovi a jak by se se zjištěnými skutečnostmi dalo pracovat. V první části je čtenář nejprve seznámen s důležitými pojmy souvisejícími s projektovým řízením firem, jako je definice projektu, dělení projektů, mapování procesů nebo jejich zlepšování. Ve druhé části jsou v teoretické rovině objasněny úlohy vybraných oddělení ve firmách, jako je obchodní či projektové oddělení, oddělení nákupu, plánování výroby a řízení kvality. Praktická část vychází z částí teoretických a je aplikována na firmu Faiveley Transport zabývající se produkcí komponent do železničního průmyslu. Jejím cílem je nejprve s použitím firemních materiálů objasnit proces od přijetí objednávky po její odeslání v rámci výše zmíněných odděleních a na konci práce je s využitím rozhovorů se zaměstnanci firmy a dotazníku rozeslaného mezi zaměstnance určeno, jak zaměstnanci vnímají efektivitu ve firmě a jaké příčiny zpoždění dodávek finálnímu zákazníkovi považují za nejčastější. Na závěr jsou navržena opatření vedoucí k odstranění činností způsobujících zpoždění odeslání produktů cílovému zákazníkovi a potažmo jeho nespokojenost

The Use of Coastal Agricultural Fields in Virginia as Foraging Habitat by Shorebirds

Volume: 108Start Page: 783End Page: 79

Nest-site selection and reproductive success of urban Red-shouldered Hawks in central California

Volume: 34Start Page: 18End Page: 2