Sökning: "bipolar gradient"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden bipolar gradient.

  1. 1. Bipolar electrochemistry for high throughput screening applications

    Författare :Sara Munktell; Fredrik Björefors; Maria Hahlin; Tautgirdas Ruzgas; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bipolar electrochemistry; electrodeposition; corrosion; screening; gradients; recycling; gold nanoparticles; Scanning Droplet Cell; Hard x-ray photoelectron spectroscopy; pitting corrosion; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Sammanfattning : Bipolar electrochemistry is an interesting concept for high throughput screening techniques due to the ability to induce gradients in a range of materials and their properties, such as composition, particle size, or dopant levels, among many others. One of the key advantages of the method is the ability to test, create or modify materials without the need for a direct electrical connection. LÄS MER

  3. 2. Quantification of Fat Content and Fatty Acid Composition Using Magnetic Resonance Imaging

    Författare :Pernilla Peterson; Malmö Medicinsk strålningsfysik; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MRI; fat quantification; water fat imaging; chemical shift; skeletal muscle; fat reference; bipolar gradient; fatty acid composition; relaxation;

    Sammanfattning : In obesity and several other disease scenarios, the measurement of fat accumulation in various organs and tissues has become a sought-after technique in clinical diagnostics and research. Especially, quantitative and non-invasive techniques which also provide images of accumulated fat throughout the body would be valuable. LÄS MER

  4. 3. Ultra High Speed InP Heterojunction Bipolar Transistors

    Författare :Mattias Dahlström; KTH; []
    Nyckelord :InP HBT carbon high-speed;

    Sammanfattning : This thesis deals with the development of high speed InPmesa HBT’s with power gain cut—off frequencies up toand above 300 GHz, with high current density and low collectordischarging times.Key developments are Pd—based base ohmics yielding basecontact resistances as low as 10 Ωµm2, base—collector grades to enable to use ofInP in the collector, and an increase in the maximum currentdensity through collector design and thermal optimization. LÄS MER

  5. 4. Electric Fields for Surface Design and Chemical Analysis

    Författare :Christian Ulrich; Fredrik Björefors; Ingemar Lundström; Tautgirdas Ruzgas; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Electric fields; Surface design; Chemical analysis; Bipolar electrodes; Impedance spectroscopy; Electrochemistry; Elektrokemi; Chemical physics; Kemisk fysik; Physical chemistry; Fysikalisk kemi; Surface and colloid chemistry; Yt- och kolloidkemi;

    Sammanfattning : This thesis deals with the use of electric fields for evaluation and control of chemical systems. An electric field can result in the flow of charge across an interface between a metal and a solution, by means of chemical reactions. This interplay between electricity and chemistry, i.e. LÄS MER

  7. 5. Metall organic vapour phase epitaxy for advanced III-V devices

    Författare :Nils Nordell; Sture Petersson; Gunnar Landgren; Ferdinand Scholz; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Metalorganic vapour phase epitaxy MOVPE ; III-V compound semiconductors; epitaxial uniformity; p-type doping profiles; epitaxial regrowth; chlorine-MOVPE; buried heterostructure laser; heterostructure bipolar transistor; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Metalorganic vapour phase epitaxy (MOVPE) has proven to be a successful method for growth of structures for advanced optoelectronic semiconductor devices in III-V compounds. This thesis deals with technological and process related aspects of MOVPE from an experimental perspective. LÄS MER