Sökning: "non-destructive evaluation"

Visar resultat 11 - 15 av 33 uppsatser innehållade orden non-destructive evaluation.

  1. 11. Acoustic Characterization of the Frequency-Dependent Attenuation Profile of Cellulose Stabilized Perfluorocarbon Droplets

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Lisa Saljén; [2020]
    Nyckelord :Ultrasound; Contrast Agent; Attenuation; Acoustic Characterization; Non Destructive Evaluation; Perfluorocarbon; Droplet; Cellulose; Oscillation; Acoustic Droplet Vaporization;

    Sammanfattning : The use of ultrasound contrast agents increases the information available for reconstruction during ultrasound imaging. Previously studied microbubbles, consisting of a gas core, are subject to limitations such as a short lifetime and a large size. LÄS MER

  3. 12. Non-destructive Evaluation of Ultrasound Contrast Agent

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Wendi Löffler; [2019]
    Nyckelord :ultrasound; microbubbles; contrast agent; attenuation; phase velocity;

    Sammanfattning : Clinical ultrasound imaging techniques can be greatly improved by the use of ultrasound contrast agents (UCAs). While microbubbles (MBs) without shell are unstable and cannot be used for practical applications,a shell produced from biocompatible polyvinylalcohol (PVA) significantly improves chemical versatility and stability. LÄS MER

  4. 13. Design and evaluation of a battery power supply for a mobile XRF measurement system

    Master-uppsats, Mittuniversitetet/Institutionen för elektronikkonstruktion

    Författare :Xingyu Zhu; [2019]
    Nyckelord :XRF; Power; Battery; Boost-circuit; Buck-circuit; Voltage regulator;

    Sammanfattning : X-ray fluorescence is a fast, non-destructive method to measure substances. This method can be used to detect elements in an environmental sample for elemental analysis. Commercially available XRF units exists, but their scope of application is limited. In the university lab, a more generalized XRF setup is available. LÄS MER

  5. 14. Alloy 718 manufactured by AM Selective Laser Melting : Evaluation of microstructure and weldability

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Valeri Ivanov Petkov; [2018]
    Nyckelord :Inconel 718; Selective Laser Melting; Additive Manufacturing; Heat Treatment; Weldability;

    Sammanfattning : Inconel 718 is one of the main superalloys that are used in hot structures of jet engines today, because of its excellent mechanical properties at high temperatures and its good weldability. This material has been extensively used and studied in cast and wrought forms during the past decades. LÄS MER

  7. 15. Non-Destructive testing of concrete with ground penetrating radar

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Byggkonstruktion och brand

    Författare :Elias Hammarström; [2018]
    Nyckelord :Concrete; Non-destructive testing; Ground Penetrating Radar GPR ; Assessment; Inspection;

    Sammanfattning : Concrete structures are susceptible to deterioration over time and it is vital to continually assess concrete structures to maintain the structural integrity and prolong the service life. In recent years there has been an increased interest in non-destructive testing of concrete, i.e. LÄS MER