Sökning: "water impedance"

Visar resultat 1 - 5 av 23 uppsatser innehållade orden water impedance.

1. 1. Characterisation of Ionic Liquid doped Polybenzimidazole Membranes for Application in High-Temperature Proton Exchange Membrane Fuel Cells

   Master-uppsats, Lunds universitet/Kemiteknik (CI)

   Författare :Adam Jacobsson Trönndal; [2023]
   Nyckelord :Fuel cells; Phosphoric acid; Polybenzimidazole; PA-PBI; Ionic liquid; IL; High temperature proton exchange membrane fuel cell; HT-PEMFC; Electrochemical impedance spectroscopy; EIS; IL-PBI; Chemical engineering; Technology and Engineering;

   Sammanfattning : In this study four membranes were tested and evaluated against each other for use in high-temperature proton exchange membrane fuel cell (HT-PEMFC) applications. A phosphoric acid (PA) doped polybenzimidazole (PBI) membrane, was used as a reference as the current state-of-the-art. LÄS MER

3. 2. Permeation studies of Niacinamide and its effect on human skin

   Master-uppsats, Malmö universitet/Institutionen för biomedicinsk vetenskap (BMV)

   Författare :Andebrhan Fsahaye; [2023]
   Nyckelord :niacinamide; permeation; human skin; impedance; hydration;

   Sammanfattning :  Background: Niacinamide (NIA) is one of the most commonly used cosmetic ingredients. It belongs to the vitamin-B3 family and has extensive dermatological therapeutic benefits. NIA has been proven to be a useful skincare product in serving as anti-acne agent, preventing skin hyperpigmentation, removal of wrinkles from the face etc. LÄS MER

4. 3. Electrical Impedance Profiling of Plants, Coffee and TREO

   Uppsats för yrkesexamina på grundnivå, Uppsala universitet/Signaler och system

   Författare :Adam Bushara; Sebastian Daniel Clyne; [2022]
   Nyckelord :;

   Sammanfattning :  The aim of the project was to investigate the possibility of using low-cost hardware to monitor plant health, measure the impedance of water containing dissolved substances at different concentrations, and observe how the plant impedance is affected compared to auxiliary measurements of soil moisture, ambient light, humidity, and temperature.To measure impedance, we used electrical impedance spectroscopy which gives the impedanceacross a spectrum of frequencies. LÄS MER

5. 4. Antenna Implants and Feasibility of Performance Limitations : AStudy of Radiation Efficiency on Electrically Small Antenna Implants with Finite Conductivity and Size

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

   Författare :Erik Algarp; [2022]
   Nyckelord :Antennaimplant; Medical Implant CommunicationSystem; Electrically small antenna; Electric dipole; Magnetic dipole; Fundamental bounds; Performance limits; Radiation efficiency; Conductor loss; Antennimplant; Medical Implant Communication System; Elektriskt små antenner; Elektrisk dipol; Magnetisk dipol; Fundamentala begränsningar; Prestandagränser; Strålningseffektivitet; Metallförlust;

   Sammanfattning : Antenna implants are used to establish a telemetry link to enable wireless data transfer, suitable for telemedicine and other medical applications. Inbody environments with water-based tissues lead to severe power absorption, making signal strength and radiation efficiency challenging yet central performance aspects of antenna implants. LÄS MER

7. 5. Barrier properties of model coatings using recycled iron oxide pigment

   Uppsats för yrkesexamina på grundnivå, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

   Författare :Nathalie Hagenfjärd; [2021]
   Nyckelord :Organic coatings; Iron oxide pigment; EIS; Barrier properties;

   Sammanfattning : The aim of this study was to compare the barrier properties of organic coatings with the same polymer matrix but different types of iron oxide particles, commercial and recycled. The work was carried out for the company SSAB with the aim of investigating whether the pigment Merox ferric oxide, which is produced in-house at the company during the pickling process, can be used and replace commercial iron oxide pigment. LÄS MER