Global ETD Search

71	Scintilační detektor sekundárních elektronů pro environmentální rastrovací elektronový mikroskop / Scintillation SE detector for ESEM Odehnal, Adam January 2016 (has links) Thesis deals with theoretical knowledge about scanning electron microscopy and environmental scanning electron microscopy. It describes principle of operation, signals generated by interaction between primary electron beam and specimen and means of detection of secondary electron signal in environmental conditions using scintillation detector. Furthermore, thesis focuses on optimization of detection od secondary electrons by adjusting electrode system of scintillation detector. Computer program Simion is used for modelling signal electron trajectories for proper adjustments. Simulation were starting-point for adjusting the design of the detector. Detection efficiency of adjusted detector was determined by evaluating signal magnitude from captured images, secondary electron detection capability from voltage contrast and quality of the captured images from signal/noise ratio.
72	Haftkräfte zwischen technisch rauen Oberflächen Fritzsche, Jörg 02 March 2017 (has links) (PDF) Die eingereichte Dissertation beschäftigt sich mit der messtechnischen Erfassung sowie der Modellierung von Haftkräften zwischen rauen Oberflächen. Dabei wurden durch Variation von Flüssigkeiten sowie dem Nutzen beschichteter Oberflächen verschiedene Benetzungseigenschaften eingestellt und untersucht. Zusätzlich wurden neben dem Kontaktwinkel der untersuchten Systeme die freien Ober- und Grenzflächenenergien bestimmt und mit den Kräften korreliert. Es zeigte sich, dass Haftkräfte auf rauen Oberflächen stets über mehrere Größenordnungen verteilt vorliegen. Die Beschreibung der ermittelten Verteilungen ist dabei entweder durch statistischer Funktionen oder zumindest teils auch durch eine im Rahmen der Arbeit entwickelten Modellierung möglich. Weiterhin zeigte sich, dass eine Unterteilung in verschiedene Haftmechanismen (durch Kapillarbrücken oder van der Waals- sowie polare Wechselwirkungen) vorgenommen werden kann. Kapillarbrücken bilden dabei die größten Kräfte aus. Sie entstehen auf Grund nanoskaliger Blasen (Nanobubbles), welche vor allem auf schlecht benetzenden Oberflächen existieren. Haftkraft Raster-Kraft-Mikroskop Rauheit Benetzung adhesive force atomic force microscope roughness wetting ddc:660 Metallschmelze Tiefenfiltration Schaumkeramik Teilchentechnologie Stoffübertragung Oberflächeneigenschaft Haftreibung Grenzflächenenergie Benetzung Rauigkeit Adsorption Blase
73	Automatizované procedury pro Koherencí řízený holografický mikroskop / Automated Procedures for Coherence Controlled Holographic Microscope Dostál, Zbyněk January 2016 (has links) Coherence-Controlled Holographic Microscope (CCHM) and a Fluorescence Holographic Microscope (FHM) were developed particularly for quantitative phase imaging and measurement of live cell dynamics, which used to be a subject of digital holographic microscopy (DHM). CCHM and FHM in low-coherence mode extend capabilities of DHM in the study of living cells. However, this advantage following from the use of low coherence is accompanied by increased sensitivity of the system to its correct alignment. Therefore, the introduction of an automatic self-correcting system is inevitable. Accordingly, in the thesis, the theory of a suitable control system is derived and the design of an automated alignment system for both microscopes is proposed and experimentally proved. The holographic signal was identified as a significant variable for guiding the alignment procedures. On this basis the original basic realignment algorithms were proposed, which encompasses the processes for initial and advanced alignment as well as for long-term maintenance of the microscope aligned state. Automated procedures were implemented in both microscopes unique set of robotic mechanisms designed and built within the frame of the thesis work. All of the procedures described in the thesis were in real experimentally proved at real microscopes in the experimental biophotonics laboratory. In addition, the control software, which contains the needed automated procedures, was developed for FHM.
74	"Åh, titta! Titta hur det ser ut!" : Små barns interaktion med digital teknik i naturvetenskapligt utforskande / "Oh, look! Look at that!" : Toddlers interaction with digital technology in scientific exploration Ericsson, Cim, Triumf, Sofia January 2019 (has links) Syftet med studien var att synliggöra hur små barn interagerar med ett mikroskop-ägg i utforskandet av naturvetenskapliga fenomen. I förskolans uppdrag ingår att arbeta med natur-vetenskap och teknik i barnens vardag. Förskollärarens kompetens och deras förhållningssätt gentemot barnen är betydelsefull för att möjliggöra för små barns digitala utforskande. Tidigare forskning visar att utforskande handlar om att få pröva, undersöka och på ett lekfullt sätt ta reda på mer om något. Det teoretiska ramverk som legat till grund för studien är social construction of technology, SCOT, vilket gett möjlighet att beskriva hur mening skapas i barns interaktion med olika tekniska artefakter. Studien genomfördes på en medelstor förskola i Luleå kommun med tre grupper barn i två-års ålder. Data samlades in med hjälp av filminspelning och ljudupptagning vid planerade aktiviteter. Bearbetningen har sketti en abduktiv analysprocess där en växelverkan mellan att härleda materialet till teoretiska utgångspunkter och en öppenhet för nya förklaringar och upp-täckter har varit vägledande. I resultatet framträder olika interaktionsramar som visar på vilket sätt barnen interagerar med den digitala teknologin utifrån tidigare erfarenheter och upplevelser. Resultatet visar även hur mikroskop-ägget på olika sätt kan möjliggöra för små barns naturvetenskapliga utforskande. Digital teknik förskola interaktion mikroskop-ägg SCOT utforskande Pedagogical Work Pedagogiskt arbete Pedagogy Pedagogik Human Aspects of ICT Mänsklig interaktion med IKT Humanities and the Arts Humaniora och konst
75	Fluorescence nanoscopy in three dimensions / Fluoreszenz-Nanoskopie in drei Dimensionen Geisler, Claudia 15 December 2009 (has links) No description available. 530 Physik Mathematics and Computer Science Mikroskopie Hochauflösung 4Pi PALM SMS photoschalten microscopy high resolution 4Pi PALM SMS photoswitching 33.18 42.03 RPV 280: Mikroskop {Physik: Optik}
76	Prüfung der Anwendbarkeit des Laser-Scanning-Mikroskopes zur Bewertung der Abnutzung von Zahnbürstenborsten / Examination of the applicability of the laser-scanning-microscope to evaluate the wear of toothbrush bristles Teske, Franziska 19 November 2013 (has links) No description available. 610 Zahnbürsten Zahnbürstenborsten Laser - Scanning - Mikroskop Zahnbürstenabnutzung toothbrush bristle toothbrush laser - scanning - microscope toothbrush wear Medizin (PPN619874732)
77	Možnosti využití nízkonapěťového transmisního elektronového mikroskopu LVEM 5 k identifikaci virů / Potential uses of the low voltage transmission electron microscope LVEM 5 for the identification of viruses. BIELNIKOVÁ, Hana January 2009 (has links) The aim of this study was to define and examin the capabilities of the low voltage transmission electron microscope LVEM 5 in the detection and identification of viruses, taking into consideration various contrasting agents, and a comparison to data from HV TEM.
78	Optimalizace UHV SEM pro studium nanostruktur v širokém rozsahu teplot / Optimization of UHV SEM for nanostructure study in wide temperature range Axman, Tomáš January 2018 (has links) This diploma thesis deals with the optimization of ultra-high vacuum scanning electron microscope - UHV SEM, which is developed within the Amispec project in cooperation with BUT, Institute of Scientific Instruments of the Czech Academy of Science and Tescan Brno, s.r.o. The theoretical part deals with the description of the actual state of the developed equipment and the research of competing systems. The next part describes the optimization of the sample holder and the pallet receptor for studying nanostructures over a wide range of temperatures. Part of the optimization is the sapphire thermal diode development and experimental verification of the functionality of the designed components. This is followed by the verification of the functionality of the whole system for the transport of samples to the UHV area, deposition with effusion cell and in-situ observations.
79	3D rekonstrukce objektů pomocí metod analýzy obrazu / Objects 3D reconstruction using image processing methods Maruniaková, Zuzana January 2018 (has links) This diploma thesis deals with 3D reconstruction of objects using image analysis methods. The work includes mathematical theory associated with this problem, a procedure for creating 2D sharp images and 3D reconstruction itself. The outputs are 2D sharp images, 3D models, stl models. Different kinds of data are analyzed.
80	Koherencí řízený holografický mikroskop s digitální optikou / Coherence Controlled Holographic Microscope with the digital optics Vavřinová, Jana January 2018 (has links) The Digital Micromirror Device (DMD) technology has been developed especially for Digital Light Processing projectors, which allow the image projection. After this succesful implementation, and thanks to the commercial availibility and low initial cost of the DMD chip, a wide range of other applications became possible. Besides, it may be used in microscopy as a spatial light modulator. For example in Coherence-Controlled Holographic Microscope (CCHM) that finds its use especially for imaging and measurement of live-cell dynamic processes. The DMD chip placed in the illumination part of CCHM allows for broadening the application possibilities. Namely it could be different illumination mode experiments or tomographic applications. The master's thesis deals with the optical design of CCHM with digital optics, i. e. DMD chip. The selection of optical elements for CCHM, the experimental verification of the imaging setup and the process of designing the illumination part are described in detail. In the end, the analysis of different designs for illumination setup with the digital optics in object arm is carried out and the results are compared.

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