Search for dissertations about: "centring"

Showing result 1 - 5 of 8 swedish dissertations containing the word centring.

  1. 1. Go with the flow : visually mediated flight control in bumblebees

    University dissertation from Lund University, Faculty of Science, Department of Biology

    Author : Nellie Linander; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; insect; vision; Bombus terrestris; flight control; optic flow; centring; flight speed; height; viewing angle; learning flight; Insect; vision; Bombus terrestris; flight control; optic flow; centring; flight speed; height; viewing angle; learning flight;

    Abstract : Despite their small brains and tiny eyes, flying insects are capable of detecting and avoiding collisions with moving obstacles, and with remarkable precision they navigate through environments of different complexity. For this thesis, I have investigated how bumblebees use the pattern of apparent image motion that is generated in their eyes as they move through the world (known as optic flow), in order to control flight. READ MORE

  2. 2. Three dimensional mathematical modelling of pronuclei migration for the mouse

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Sofia Tapani; Göteborgs universitet.; Gothenburg University.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; fertilisation process; pronucleus; dynamical simulation; SDE; correlation; CUSUM; microtubule; confocal microscopy; dynamical simulation; microtubule; SDE; CUSUM; confocal microscopy; pronucleus; correlation;

    Abstract : The main question addressed in this thesis is what happens between the moment when the sperm enters the egg and the fusion of the male and the female pronuclei. Orientation of the apposing pronuclei most likely plays a decisiverole in the polarity of the developing embryo. READ MORE

  3. 3. Applanation Resonance Tonometry for Intraocular Pressure Measurement

    University dissertation from Umeå : Tillämpad fysik och elektronik

    Author : Per Hallberg; Olof A. Lindahl; Anders Eklund; Christina Lindén; Per Ask; [2006]
    Keywords : Physics; Resonance; applanation; tonometry; glaucoma; Goldmann; biomechanical; Intraocular; ART; Fysik; fysik; Physics;

    Abstract : Elevated intraocular pressure (IOP) is one of the major risk factors for glaucoma. Since glaucoma is a leading cause of blindness, reliable methods for measuring the IOP are important. This doctoral dissertation presents a new method, applanation resonance tonometry (ART), for measurement of IOP. READ MORE

  4. 4. Aspects on measuring electrical current utilizing magnetic zero-flux technique

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Maria Hammarqvist; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Current Transformer; AC Current; Frequency Response; Measurement Uncertainty; Traceability; Zero-Flux Measurement Technique; Zero-Flux;

    Abstract : The utilization of high accuracy measurements of electrical quantities is a prerequisite for the development of modern society. Generally, measurements serve different purposes and hence the criteria for the measurement equipment and method are different. READ MORE

  5. 5. Active Lateral Secondary Suspension in a High-Speed Train to Improve Ride Comfort

    University dissertation from Stockholm : KTH

    Author : Anneli Orvnäs; Sebastian Stichel; Viktor Berbyuk; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; railway; active suspension; ride comfort; sky-hook; Hinf; multi-body simulations; on-track tests; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Abstract : Active secondary suspension in trains has been studied for a number of years, showing promising improvements in ride comfort. However, due to relatively high implementation and maintenance costs, active technology is not being used in service operation to a large extent. READ MORE