Sökning: "ions upstream"

Hittade 5 uppsatser innehållade orden ions upstream.

  1. 1. Faradaic Reactions in Capacitive Deionization : A Comparison of Desalination Performance in Flow-through Cell Architectures

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :John Bradley; Miranda Carlström; [2023]
    Nyckelord :Capacitive deionization; Faradaic reactions; Flow-through CDI; Upstream anode; Downstream anode; Desalination Performance; pH fluctuations;

    Sammanfattning : Capacitive Deionization (CDI) is an energy-efficient desalination technology that utilizes an electric field to extract ions from water. Flow-through CDI systems show potential for superior desalination performance compared to traditional flow-by CDI; however, they face the challenge of increased occurrence of Faradaic reactions, leading to undesired by-products and reduced energy efficiency. LÄS MER

  3. 2. Identifying Fundamental Characteristics of Shock Nonstationarity using MMS Measurements : Identifying and Distinguishing Non-stationary Behaviour Through the Magnetic Field Gradient in Quasi-perpendicular Shocks

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Hannah Wik; [2023]
    Nyckelord :Space; Space Plasma Physics; Collisionless Shocks; MMS; Non-stationarity; Shock Reformation; Rippling; Bow Shock; Solar Wind; Rymd; Rymdfysik; Kollisionsfria chocker; MMS; Icke-stationär; Reformation; Bogchock; Solvind;

    Sammanfattning : Collisionless shocks are widespread phenomena in the universe, and understanding the mechanisms behind their energy dissipation, with a rare number of collisions between particles, remains a significant unresolved question. The Earth’s bow shock provides an excellent opportunity to study this phenomena in situ. LÄS MER

  4. 3. Energetic O+ ions upstream from the Saturnian bow shock, measured by Cassini

    L3-uppsats, Institutionen för fysik och astronomi; Institutet för rymdfysik, Uppsalaavdelningen

    Författare :Dimitrios Tsimpidas; [2013]
    Nyckelord :Cassini; INCA; Space; Saturn; bow shock; ions upstream;

    Sammanfattning : We use particle and magnetic field data from the Ion and Neutral Camera (INCA) and the magnetometer (MAG) onboard Cassini to detect and examine an energetic particle event that occurred upstream from the Saturnian bow shock during DOY 229/2007. The energetic (>100 keV) O+ ions are observed only when the Interplanetary Magnetic Field (IMF) connects the spacecraft with the planetary bow shock. LÄS MER

  5. 4. Identifiering av fosfatfosfors käll- och flödesfördelning i ett litet jordbruksområde

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Rasmus Rönnberg; [2012]
    Nyckelord :Eutrophication; phosphorous; agricultural area; hydrology; HYPE; isotope;

    Sammanfattning : Eutrophication of lakes and streams are nowadays a well known environmental problem and implies an enrichment of the nutrients phosphorus (P) and nitrogen (N). Phosphorus is considered to be the most important component for the growth of aquatic plants and leads in too large quantities to an intensification of growth. LÄS MER

  7. 5. Surhetstillståndet i bäckar uppströmskalkdoserare i Dalarnas län

    Kandidat-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Goulnara Khoussainova; [2010]
    Nyckelord :försurningsbedömning; buffertkapacitet; surhetstillstånd; kalkning; vattenkemisk analys;

    Sammanfattning : The acid deposition of sulphur- and nitrogenoxides from combustion of coal and oil cause acidification that lowers pH and gives increased contents of metals and altered aquatic biodiversity in the stream. The liming of lakes and streams, which was introduced to resist the acidification, demand large economic resourses despite of the decreased deposition of the acidifyng substances. LÄS MER