Sökning: "RARE-EARTH ELEMENTS"

Visar resultat 41 - 45 av 67 avhandlingar innehållade orden RARE-EARTH ELEMENTS.

  1. 41. All-fibre optical sensor system for chemical sensing based on fibre Bragg grating technology

    Författare :Adel Asseh; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals with the realization of an all-fibresensor system for chemical sensing through the evanescentfield, based on fibre Bragg grating technology. The advantagesof all-fibre systems are most apparent for the potential userof the system. These systems are of small size, have highmobility, and require no precision alignment. LÄS MER

  3. 42. Development of metal hydride surface structures for high power NiMH batteries : Also extended cycle-life and lead to more effective recycling methods

    Författare :Yang Shen; Dag Noréus; Andreas Züttel; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Metal hydrides; NiMH batteries; Surface treatment; Ni clusters; Rare earths hydroxides; Oxygen; Hydrogen; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : By combining alkaline etching of hydrogen storage alloys or their hydrides with a controlled oxidation, it was possible to improve reaction kinetics and accelerate activation of MH-electrodes. Both AB5 and AB2 alloys were studied where A is mixtures of rare earth elements for AB5 alloys and titanium and/or vanadium, zirconium for AB2 alloys; nickel contributes the major part of B. LÄS MER

  4. 43. Tectonic implications of ca. 1.45 Ga granitoid magmatism at the southwestern margin of the East European Craton

    Författare :Audrius Cecys; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geologi; southern Sweden; fysisk geografi; physical geography; Mesoproterozoic; geochemistry; syntectonic; petrology; structural geology; anisotropy of magnetic susceptibility; Danopolonian orogeny; Geology; granite;

    Sammanfattning : Between ca 1.53 and 1.40 Ga, the southwestern margin of the East European Craton was subjected to extensive magmatism and deformation. While various suites of anorthositic, mangeritic and charnockitic-granitic rocks were emplaced between ca. LÄS MER

  5. 44. Electronic structure studies using resonant X-ray and photoemission spectroscopy

    Författare :Martin Magnuson; D D Sarma; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Fysik; Physics;

    Sammanfattning : This thesis addresses the electronic structure of molecules and solids using resonant X-ray emission and photoemission spectroscopy. The use of monochromatic synchrotron radiation and the improved performance of the instrumentation have opened up the possibility of detailed analyses of the response of the electronic systems under interaction with X-rays. LÄS MER

  7. 45. Extended Producer Responsibility for Closing Material Loops: Lessons from energy-efficient lighting products

    Författare :Jessika Luth Richter; Internationella miljöinstitutet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Extended Producer Responsibility; recycling; fluorescent lighting; waste management; Policy Evaluation; LEDs; WEEE Directive;

    Sammanfattning : The transition to a low-carbon economy requires enabling technologies including energy-efficient lighting products. It is increasingly recognized that a sustainable economy is not only low-carbon and energy efficient, but also resource efficient. LÄS MER