Search for dissertations about: "eye fatigue"

Showing result 1 - 5 of 16 swedish dissertations containing the words eye fatigue.

2. 1. Very high cycle fatigue of automotive steels : Testing and computation at 20 kHz

   Author : Mohamed Sadek; Jens Bergström; Nils Hallbäck; Ulrich Krupp; Karlstads universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Very high cycle fatigue; ultrasonic fatigue testing; automotive steels; fatigue strength; stress intensity computation; crack growth; Materialteknik; Materials Engineering;

   Abstract : Mechanical fatigue failure occurs in components subjected to cyclic loading. A crack initiates at critical regions in the component and propagates during repeated loading. The expected fatigue life depends on the level, type and frequency of the loading. READ MORE

4. 2. Self-rated health and respiratory symptoms among civil aviation pilots : Occupational and non-occupational risk factors

   Author : Xi Fu; Dan Norbäck; Christer Janson; Berndt Stenberg; Uppsala universitet; []
   Keywords : Civil Aviation; Aircraft pilot; Indoor environment; Self-rated health SRH ; Respiratory health; Asthma; Rhinitis; Headache; Fatigue; Insom-nia; Body mass index BMI ; Sense of Coherence SOC ; Psychosocial work environment; Quantitative PCR; Fungal DNA; Volatile organic compounds of microbial origin MVOC ; Cat allergen; Dog allergen; Horse allergen;

   Abstract : There is concern about the indoor environment in aircraft but few stud-ies exist on self-rated health (SRH) and respiratory symptoms among pilots. Occupational and non-occupational risk factors for SRH, respira-tory symptoms and other symptoms among commercial pilots were investigated in this thesis. READ MORE

5. 3. On the asperity point load mechanism for rolling contact fatigue

   Author : Johan Dahlberg; Bo Alfredsson; Sören Sjöström; KTH; []
   Keywords : Rolling contact fatigue; Spalling; Asperity contact; Point load; Micro-cracks; Traction; Applied slip; TECHNOLOGY; TEKNIKVETENSKAP;

   Abstract : Rolling contact fatigue is a damage process that may arise in mechanical applications with repeated rolling contacts. Some examples are: gears; cams; bearings; rail/wheel contacts. The resulting damage is often visible with the naked eye as millimeter sized surface craters. READ MORE

6. 4. Fatigue and Corrosion Fatigue Fracture of a Plasma Nitrided, Laser Hardened, and Galvanized B-Mn Steel

   Author : Pedro De la Cruz Rodrígues; Birger Karlsson; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : Fundamental and technological aspects of fatigue and fracture of conventional and advanced material are topics of primary importance to the development of materials science and engineering. Surface treatments have been established to improve the surface properties of material against surface phenomenon such as wear, corrosion, fatigue and corrosion fatigue. READ MORE

7. 5. Too tired to talk? Sleep, fatigue, and social functioning

   Author : Benjamin C Holding; Karolinska Institutet; Karolinska Institutet; []
   Keywords : ;

   Abstract : Sleep has been shown to have many health promoting functions, and is vital for the maintenance of physiological, cognitive, and emotional well-being. Much of what we know about sleep derives from studies showing what happens when individuals do not obtain sufficient sleep. READ MORE