Sökning: "Nitrogen-rich"

Visar resultat 1 - 5 av 19 avhandlingar innehållade ordet Nitrogen-rich.

  1. 1. Synthesis and Characterization of Nitrogen-rich Calcium α-Sialon Ceramics

    Författare :Yanbing Cai; Saeid Esmaeilzadeh; Zhijian Shen; Elis Carlström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nitrogen-rich; SiAlON; Sintering; Microstructure; Properties; Inorganic chemistry; Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : In this thesis, a synthesis concept has been developed, which uses nitrogen-rich liquid phases for sintering of Ca-α-sialon ceramics. First, keeping the Si/Al ratios constant, the effects of N/O ratio on the properties and microstructure were investigated through a liquid phase sintering process. LÄS MER

  3. 2. Preparation, characterization and properties of nitrogen rich glasses in alkaline earth-Si-O-N systems

    Författare :Ali Sharafat; Saeid Esmaeilzadeh; Stuart Hampshire; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Oxynitride glasses; glass forming region; nitrogen content; hardness; refractive index; Inorganic chemistry; Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : Nitrogen rich glasses in the systems Ca-Si-O-N, Sr-Si-O-N and AE-Ca-Si-O-N (AE = Mg, Sr and Ba) have been prepared using a novel glass-synthesis route. The limits of the glass forming regions in the Ca and Sr systems and substitution limits in the AE-Ca-Si-O-N systems have been determined and physical properties of the glasses measured. LÄS MER

  4. 3. Wear resistant low friction coatings for machine elements

    Författare :Olle Wänstrand; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; materialvetenskap; Materials Science;

    Sammanfattning : By the introduction of machine elements made of light metals, e.g. Al or Mg alloys, which are coated with a material providing high wear resistance and low friction coefficient, both economical and environmental benefits can be gained. A high resistance against wear results in increased lifetime and lower costs for spare parts and maintenance. LÄS MER

  5. 4. Comparative study on different Anammox systems

    Författare :Grzegorz Cema; Elżbieta Płaza; Joanna Surmacz-Górska; Karl-Heinz Rosenwinkel; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Anammox; biofilm system; landfill leachate; nitrogen removal; reject water; removal rates; Environmental engineering; Miljöteknik;

    Sammanfattning : The legal requirements for wastewater discharge into environment, especially to zones exposed to eutrophication, lately became stricter. Nowadays wastewater treatment plants have to manage with the new rules and assure better biogenic elements’ removal, in comparison with the past. LÄS MER

  7. 5. Surface Stabilization and Electrochemical Properties from a Theoretical Perspective

    Författare :Daniel Petrini; Karin Larsson; Jan-Otto Carlsson; Martin Stutzmann; Uppsala universitet; []
    Nyckelord :Inorganic chemistry; DFT; Diamond; High surface conductivity; Surface reactivity; c-BN; Oorganisk kemi;

    Sammanfattning : Diamond and cubic boron nitride surfaces have extreme properties that can be exploited in novel tribological, electrochemical and electronic applications. Normally insulating diamond surfaces can exhibit high surface conductivities due to hydrogen termination and the nature of the surrounding atmosphere. LÄS MER