Micromechanical High-doses Radiation Sensor with Bossed Membrane and Interferometry Optical Read-out

AbstractThe silicon-glass MEMS high-doses radiation sensor with in situ detection, so far not possible in the field of detection of doses above 10 kGy, has been presented. The sensor consists of a chamber filled with the high density polyethylene (HDPE) and a silicon bossed membrane. The radiolysis product of HDPE increases the pressure inside the chamber causing the deflection of the membrane, which is proportional to the pressure, thus to radiation dose. The sensor has been irradiated with high energy electron beam and shows good detectability for 10-40 kGy. The deflection of the membrane has been detected by optical interferometer

Technological Assessment of MEMS Alkali Vapor Cells for Atomic References

This paper is a review that surveys work on the fabrication of miniature alkali vapor cells for miniature and chip-scale atomic clocks. Technology on microelectromechanical systems (MEMS) cells from the literature is described in detail. Special attention is paid to alkali atom introduction methods and sealing of the MEMS structure. Characteristics of each technology are collated and compared. The article’s rhetoric is guided by the proposed classification of MEMS cell fabrication methods and contains a historical outline of MEMS cell technology development

Alkali Vapor MEMS Cells Technology toward High-Vacuum Self-Pumping MEMS Cell for Atomic Spectroscopy

The high-vacuum self-pumping MEMS cell for atomic spectroscopy presented here is the result of the technological achievements of the author and the research group in which he works. A high-temperature anodic bonding process in vacuum or buffer gas atmosphere and the influence of the process on the inner gas composition inside a MEMS structure were studied. A laser-induced alkali vapor introduction method from solid-state pill-like dispenser is presented as well. The technologies mentioned above are groundbreaking achievements that have allowed the building of the first European miniature atomic clock, and they are the basis for other solutions, including high-vacuum optical MEMS. Following description of the key technologies, high-vacuum self-pumping MEMS cell construction and preliminary measurement results are reported. This unique solution makes it possible to achieve a 10−6 Torr vacuum level inside the cell in the presence of saturated rubidium vapor, paving the way to building a new class of optical reference cells for atomic spectroscopy. Because the level of vacuum is high enough, experiments with cold atoms are potentially feasible

Polish market of spare parts for truck analysis, and Kamar company development chances

Poniższa praca poświęcona została dwóm zagadnieniom. Pierwszym z nich jest analiza rynku części zamiennych i akcesoriów do samochodów ciężarowych w Polsce. Drugim natomiast, analiza firmy Kamar, będącej przedstawicielem tego rynku, na tle konkurencji. Celem pracy jest identyfikacja możliwych strategii i kierunków rozwoju, na przykładzie wymienionej powyżej firmy.Na obraz pracy składa się w pierwszej kolejności część teoretyczna, zawarta w rozdziałach pierwszym i drugim. Rozdziały trzeci i czwarty stanowią analizę firmy Kamar i wybranych firm konkurencyjnych. Na końcu pracy zostanie przeprowadzone podsumowanie wyników badań. Autor podejmie również próbę określenia optymalnej strategii i kierunku rozwoju analizowanego przedsiębiorstwa.W niniejszej pracy przyjęto dwie hipotezy. Pierwsza z nich mówi o szansie rozwoju i ekspansji przedsiębiorstwa poprzez wprowadzenie na rynek towarów własnej produkcji. Natomiast w myśl drugiej, elementem wspierającym rozwój firmy Kamar, jest zwiększenie liczby punktów dystrybucji towarów na terenie Polski.This thesis focuses on two aspects. The first one is an analysis regarding to polish market of spare parts and accessories for trucks. The second one is an analysis of Kamar company, which is a representative of mentioned market, and her comparison to the competitors. The main goal of presented thesis is an identification of plausible development strategies for Kamar company.Primarily, first and second chapter of the thesis contains theoretical part, based on wide literature studies. Thereafter, chapters three and four presents an analysis of Kamar company, and chosen market competitors. Finally, the results of mentioned analyses are going to be presented, and summarized. At the end of this thesis, author is going to reveal the optimal development strategy for studied company.Hereby, two hypotheses are being tested. First of them is saying that the chance for Kamar company development is to set her own production line and introduce those product under a new brand to the market. Second hypothesis stands, that development of mentioned organization is connected with augmentation the number of company sales points in Poland

Pomotional activities used in the Internet by polish companies from automotive market

This thesis focuses on Internet promotion activities on Polish automotive market. Main aim is to underline promotion activities used by companies to promote their car dealers. Moreover, the aim is to emphasize those activities of both, companies and car dealers, which are connected with Internet.The thesis contains theoretical part, based on wide literature studies, as well as empirical part compiled on the basis of author own research. In order to posses information needed, author decided to provide individual interviews with dealers sales representatives of Fiat, Renault and Suzuki.Interview was made with sales representatives of one dealer of each mentioned above company in Krakow. Studies have shown that it is possible to distinguish certain characteristic of Internet promotional activities, which are typical for companies of Polish automotive market.The results may be subjective because of the limited number of analyzed companies. The results show however some characteristic methods of promotion activities in the Internet, which are used by all analyzed companies and dealers.Poniższa praca została poświęcona tematyce promocji w Internecie polskich przedsiębiorstw branży motoryzacyjnej. Celem pracy było przedstawienie działań promocyjnych wystosowywanych przez koncerny samochodowe do autoryzowanych dealerów marki, a także działań promocyjnych w Internecie prowadzonych zarówno przez same koncerny, jak i przez dealerów.Na pracę składa się część teoretyczna, oparta na analizie literaturowej, oraz praktyczna część badawcza. W celu pozyskania informacji do badań, autor przeprowadził wywiad osobisty z przedstawicielami koncernów Fiat, Renault i Suzuki, w salonach tych marek na terenie miasta Krakowa.Wywiad został przeprowadzony na próbie jednego salonu każdej z wymienionych powyżej marek. Wyniki ukazały, że można mówić o pewnej prawidłowości w prowadzeniu działań promocyjnych w Internecie polskich przedsiębiorstw branży motoryzacyjnej.Wyniki przeprowadzonych badań mogą być subiektywne, ze względu na dobraną próbę badawczą trzech marek. Ukazują one jednak pewne prawidłowości, którymi kierują się koncerny motoryzacyjne przy przeprowadzaniu akcji promocyjnych

Sealing of silicon-glass microcavities with polymer filling

Investigation of hermetic sealing of selected polymers in silicon-glass microcavities has been presented. The anodic bonding method has been adapted for hermetic encapsulation of the polymer in microcavity. According to standard conditions of the anodic bonding process (temperature: 400°C, voltage: 1000 V), the main challenge was the significant reduction of temperature in order to avoid degradation of the polymer. An analysis of the influence of reduced temperature and oxygen-free atmosphere on bond quality has been done. Proper parameters of the anodic bonding process enabling good and hermetic encapsulation of the polymer in the microcavity as well as optimal polymer treatment have been elaborated. Studies have shown that the closure of high density polyethylene in microcavity by anodic bonding process at a temperature reduced to 340°C is possible. This procedure will be used for the fabrication of main elements for a new family of high radiation MEMS sensors