Sökning: "differential measurements"

Visar resultat 11 - 15 av 211 avhandlingar innehållade orden differential measurements.

  1. 11. Advanced Schottky Diode Receiver Front-Ends for Terahertz Applications

    Författare :Peter Sobis; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; terahertz electronics; TRL-calibration; frequency converters; down converters; phase shifters; S-parameter measurements; Schottky diodes; subharmonic mixers; radiometers; terahertz technology; submillimetre wave technology; heterodyne receivers; differential phase shifters; sideband separating mixers;

    Sammanfattning : This thesis treats the development of high frequency circuits for increased functionality of terahertz receiver front-ends based on room temperature Schottky diode technology. This includes the study of novel circuit integration schemes, packaging concepts as well as new measurement and characterisation techniques. LÄS MER

  2. 12. Optical techniques for measurements of atmospheric trace gases

    Författare :Pär Ragnarson; [1994]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:1994:Ragnarsson;

    Sammanfattning : Differential optical absorption spectroscopy (DOAS) and differential absorption lidar (DIAL) have been used for measurement of atmospheric trace gases. A fully automated system for atmospheric pollution monitoring of a medium-sized city has been constructed, based on the DOAS technique. LÄS MER

  3. 13. Computed Tomography of Acetabular Cup Wear and Effect of Surface Roughness on Wear and Oxidation of UHMWPE Hip Prostheses

    Detta är en avhandling från Stockholm : KTH

    Författare :Anneli Jedenmalm; KTH.; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hip prostheses; Computed Tomography; Surface roughness; UHMWPE; Wear; Coating; Gamma-irradiation; pin-on-disc; hip simulator; TECHNOLOGY Other technology Medical engineering; TEKNIKVETENSKAP Övriga teknikvetenskaper Medicinsk teknik;

    Sammanfattning : Aseptic loosening is the most common complication in total hip replacement (5- 10% at 10 years follow up). The magnitude of the problem is illustrated by the fact that about one million hip prostheses are implanted worldwide each year. LÄS MER

  4. 14. Optimal Control of Partial Differential Equations in Optimal Design

    Detta är en avhandling från Stockholm : KTH

    Författare :Jesper Carlsson; KTH.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Optimal design; MATHEMATICS Applied mathematics Numerical analysis; MATEMATIK Tillämpad matematik Numerisk analys;

    Sammanfattning : This thesis concerns the approximation of optimally controlled partial differential equations for inverse problems in optimal design. Important examples of such problems are optimal material design and parameter reconstruction. In optimal material design the goal is to construct a material that meets some optimality criterion, e.g. LÄS MER

  5. 15. Characterisation and application of a laser-based hard x-ray source

    Detta är en avhandling från Department of Physics, Lund University

    Författare :Matthias Grätz; Lund University.; Lunds universitet.; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; X-ray spectroscopy; radiography; medical imaging; differential imaging; time-gated imaging; scatter reduction; Monte Carlo simulation; Atomic and molecular physics; computed tomography; Fysicumarkivet A:1998:Grätz; laser-produced plasma; Atom- och molekylärfysik; X-ray sources;

    Sammanfattning : Hard X-rays are generated by focusing 110 fs laser pulses with intensities of about 1017 W·cm-2 onto solid metal targets. Characteristic properties of this X-ray source are the small source size, the short pulse duration and the high peak flux. LÄS MER