Sökning: "nickel"

Visar resultat 21 - 25 av 431 avhandlingar innehållade ordet nickel.

1. 21. Nickel allergy in a Swedish adolescent population and its relation to orthodontic treatment and lifestyle factors

   Författare :Ronny Fors; Berndt Stenberg; Maurits Persson; Arne Hensten; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; adolescent; dental plaque; lifestyle; nickel; oral; orthodontic treatment; patch test; questionnaire; sensitisation; tolerance; Orthodontics; Ortodonti;

   Sammanfattning : Nickel stands out as the main cause of contact allergy in both children and adults, which has given rise to concern and the introduction of regulations by official bodies. Today´s youths are frequently exposed to body piercing and orthodontic treatment. LÄS MER

3. 22. Electrochromism in Nickel-based Oxides : Coloration Mechanisms and Optimization of Sputter-deposited Thin Films

   Författare :Esteban Damián Avendaño Soto; Gunnar Niklasson; Andris Azens; Claes-Göran Granqvist; Ulf Helmersson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Nickel based Oxide; Electrochromism; Thin Films; Sputtering; Coloration mechanism; Fysik; Physics; Fysik;

   Sammanfattning : Electrochromic properties of sputter-deposited nickel-based oxide films have been studied with a two-fold goal. From a practical point of view, the optical switching performance has been improved by optimizing the deposition conditions and film stoichiometry with respect to oxygen and hydrogen, and further by adding Mg, Al, Si, Zr, Nb or Ta to the films. LÄS MER

4. 23. Recovery of Rare Earth Elements from spent Nickel-Metal Hydride Batteries from Hybrid Electric Vehicles

   Författare :Kivanc Korkmaz; Kerstin Forsberg; Åke C. Rasmuson; Gisele Azimi; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Rare earth elements; hybrid electric vehicles; recycle; nickel; cobalt; precipitation; anti-solvent crystallization; selective roasting; Sällsynta jordartsmetaller; hybridelektriska fordon; återvinning; nickel; kobolt; utfällning; förträngningskristallisation; selektiv rostning; Chemical Engineering; Kemiteknik;

   Sammanfattning : Rare earth elements (REE) are a group of elements that are of critical importance in numerous technological applications, including “green technologies” such as wind turbines and hybrid car batteries. When the criticality of applications is considered, problems in supply has brought the option of effective secondary resource utilization into consideration. LÄS MER

5. 24. Fabrication and Corrosion Properties of Nickel Silicides Thin Films

   Författare :Eric Tam; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nickel silicides; ion-beam sputter deposition; potentiodynamic polarisation measurements; X-ray photoelectron spectroscopy; corrosion.; thin films;

   Sammanfattning : Surface engineering is a vital issue in engineering materials design. The enhancement of surface properties extends the materials lifetime and improves the materials performance without changing the bulk properties. Thin film deposition is one of the most commonly applied techniques in this field. LÄS MER

7. 25. Nickel allergy and hand eczema : epidemiological aspects

   Författare :Anna Josefson; Birgitta Meding; Bernt Lindelöf; Örebro universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; childhood eczema; contact allergy; patch test; population-based; predictive value; questionnaire; self-test; sensitivity; specificity; validity; wet work; MEDICINE; MEDICIN; Dermatology and venerology; Dermatologi och venerologi; Dermatology and Venerology; Dermatologi och venereologi;

   Sammanfattning : Nickel allergy is the most prevalent contact allergy and has been discussed as a possible riskfactor for hand eczema. However, hand eczema is one of the most frequently occurring skindiseases and has multifactorial origin. The aim of this thesis was to study the association between nickel allergy and hand eczema in the general population. LÄS MER