Sökning: "SEM EDX"

Visar resultat 11 - 15 av 73 avhandlingar innehållade orden SEM EDX.

  1. 11. Microstructure Investigation of the Oxidation Process in Zircaloy-2 - The Effect of Intermetallic Particle Size

    Författare :Pia Tejland; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Zircaloy-2; STEM; HAADF; ADF; FIB; SEM; EDX; APT;

    Sammanfattning : Zirconium alloys are widely used in nuclear reactors as fuel cladding tubes because of their low thermal neutron capture cross-section, good corrosion properties and satisfactory mechanical properties. With an improved corrosion resistance the alloys could be used for much longer times in the reactors, increasing fuel burn-up and decreasing the amount of radioactive waste. LÄS MER

  3. 12. Effect of metal and cubic carbide additions on interface chemistry, phase composition and grain growth in WC-Co based cemented carbides

    Författare :Jonathan Weidow; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; APT; TEM; EBSD; SEM; EDX;

    Sammanfattning : A cemented carbide is a composite material used in metal cutting operations. A hardness providing WC-based skeleton is embedded in a toughness providing binder, mainly consisting of Co. The material is produced by powder metallurgical methods. LÄS MER

  4. 13. Atmospheric corrosion of the MgAl alloy AM50 in rheocast and high pressure diecast conditions - Influence of Microstructure, CO2 and NaCl

    Författare :Mehrdad Shahabi Navid; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SEM; MgAl alloy; Atmospheric corrosion; High pressure diecast; XPS; XRD; Rheocast;

    Sammanfattning : The NaCl-induced atmospheric corrosion of the high pressure diecast (HPDC) MgAl alloy AM50 was investigated. Commercially pure (CP) Mg was used as the reference. Two levels of salt; i.e. LÄS MER

  5. 14. On Weapons Plutonium in the Arctic Environment (Thule, Greenland)

    Författare :Mats Eriksson; Lund Medicinsk strålningsfysik; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Nuclear physics; Kärnfysik; Nuclear medicine; radiobiology; Nukleärmedicin; radiobiologi; Nuclear engineering and technology; Kärnteknik; realtime digital image systems; SEM; ICP-MS; alpha spectrometry; gamma spectrometry; heterogeneous activity concentration; hot particle; separation technique; isotopic ratio; inventory; source term; fallout; americium; uranium; plutonium; radionuclide; Bylot Sound; Greenland; Thule; environmental radioactivity; nuclear accident;

    Sammanfattning : This thesis concerns a nuclear accident that occurred in the Thule (Pituffik) area, NW Greenland in 1968, called the Thule accident. Results are based on different analytical techniques, i.e. gamma spectrometry, alpha spectrometry, ICP-MS, SEM with EDX and different sediment models, i. LÄS MER

  7. 15. The relationship between fly ash chemistry and the thermal formation of polychlorinated pollutants during waste incineration

    Författare :Duong Ngoc Chau Phan; Stellan Marklund; Bogdan Dlugogorski; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Incinerations; dioxins; PCDD Fs; PCBs; PCNs; flue gas; fly ash; sampling; particle characterization; XPS; XRD; SEM EDX; formation; chlorination; PCA; OPLS; OPLS-DA;

    Sammanfattning : The thermal formation of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), biphenyls (PCBs), and naphthalenes (PCNs) is a major problem in waste incineration. Ideally, rather than relying on air cleaning systems and treatment techniques, their formation should be minimized or, if possible eliminated. LÄS MER