Sökning: "Aging"

Visar resultat 11 - 15 av 819 avhandlingar innehållade ordet Aging.

  1. 11. Lithium-ion battery models for performance and aging

    Författare :Jing Ying Ko; Göran Lindbergh; Ulrike Krewer; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lithium-ion batteries; pseudo two-dimensional model; model extension; parametrization; aging; lifetime; Chemical Engineering; Kemiteknik;

    Sammanfattning : The demand for lithium-ion batteries (LiBs) is increasing at an exponential rate, so is the need to understand their behaviors and properties.In this pursuit, models are useful tools for improving cell design,quality, control system, keeping track of performance, aging andlifetime. LÄS MER

  3. 12. Aging Hematopoiesis: Functional Insights and Prospects for Rejuvenation

    Författare :Anna Konturek-Ciesla; Avdelningen för molekylär hematologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Hematopoietic stem cells; Aging; Lineage tracing; Transcriptome profiling; Transplantation;

    Sammanfattning : Aging exerts profound effects on the hematopoietic system, leading to a loss of homeostatic control and reduced regenerative capacity. Clinical consequences of these changes include anemia, compromised immune function and an increased prevalence of myeloid disorders among the elderlies. LÄS MER

  4. 13. Electrochemical Studies of Aging in Lithium-Ion Batteries

    Författare :Matilda Klett; Göran Lindbergh; Charles Delacourt; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aging; EIS modeling; electrolyte characterization; graphite; hybrid electric vehicles; impedance spectroscopy; LiFePO4; Li-ion batteries;

    Sammanfattning : Lithium-ion batteries are today finding use in automobiles aiming at reducing fuel consumption and emissions within transportation. The requirements on batteries used in vehicles are high regarding performance and lifetime, and a better understanding of the interior processes that dictate energy and power capabilities is a key to strategic development. LÄS MER

  5. 14. The aging brain and changes in cognitive performance : Findings from morphometry and quantitative susceptibility mapping of iron

    Författare :Ninni Persson; Håkan Fischser; Kristine B. Walhovd; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; brain aging; volumes; ndividual differences; QSM; cognitive aging; iron; episodic memory; fluid-; crystalized abilities; sex differences; gender differences; Psychology; psykologi;

    Sammanfattning : Brain aging is a heterogeneous phenomenon, and this thesis illustrates how the course of aging can vary within individuals over time and between individuals as a function of age, sex, and genetic variability. We used two contrasts from magnetic resonance imaging (MRI), namely spin-lattice T1-weighted imaging, and quantitative susceptibility mapping (QSM) from gradient-echo images, to picture the aging brain, by means of morphometric measures and brain-iron concentrations. LÄS MER

  7. 15. Aging effects on commercial lean NOx trap catalysts

    Författare :Jesus De Abreu Goes; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aging; thermal degradation; sulfur poisoning; characterization; commercial lean NOx traps; NOx storage and reduction;

    Sammanfattning : As a countermeasure to global warming, vehicles with low carbon emissions are being investigated by promoting lean-burn engines and high combustion efficiencies. However, one limitation to the increasing use of these engines is the need to develop corresponding catalytic systems for controlling the nitrogen oxide (NOx) emissions in their lean exhaust. LÄS MER