Essays about: "activity coefficient"

Showing result 1 - 5 of 32 essays containing the words activity coefficient.

1. 1. Investigation of the impact of different sugar compositions on the moisture absorption of hard candy when exposed to a humid environment

   University essay from Lunds universitet/Livsmedelsteknik och nutrition (master)

   Author : Gila van den Eijnde; [2023]
   Keywords : Hard candy; Sugar composition; Hygroscopicity; Moisture absorption; Shelf life; Product stability; Food technology; Technology and Engineering;

   Abstract : Hard candy is hygroscopic, implying that hard candy readily absorbs moisture from the environment, resulting in adverse changes in the texture and appearance of the candy. This thesis investigates the impact of different sugar compositions on the moisture absorption of hard candy when exposed to a humid environment. READ MORE

3. 2. Feasibility of quantitative 99mTc-DPD scintigraphy SPECT/CT for assessing the burden of ATTR cardiac amyloidosis

   University essay from Umeå universitet/Radiofysik

   Author : Sajad Kadhim Khalaf; [2023]
   Keywords : QSPECT; Amyloidosis; ATTR; LVMI; Recovery Coefficient; SUV; Calibration;

   Abstract : Background: Amyloid transthyretin (ATTR) cardiomyopathy is caused by the deposition of misfolded proteins, known as amyloid fibrils, in the myocardium. Quantitative Single Photon Emission Computed Tomography (QSPECT) utilizing 99mTc-DPD scintigraphy has the potential to assess ATTR-suspected cardiac amyloidosis (CA). READ MORE

4. 3. Uptake and retainment of radionuclides in edible mushrooms – from fruiting to cooking

   University essay from

   Author : Delshad Mansour Ayoubi; [2022-12-06]
   Keywords : Medical physics; Activity concentration; Transfer coefficient; Dose;

   Abstract : Purpose: The purpose of this study was to study the uptake, distribution and transfer of Mn-54, Zn-65, U-238, U-235, U-234, and Po-210 in mushrooms and their respective caps and stalks, the effects of chelates and ligands, and the potential release of radionuclides during a cooking procedure. Introduction: Fungi are organisms that are composed of a fruiting body (mushroom) and tubular hyphae, that branches out into complex networks called mycelium. READ MORE

5. 4. ESTIMATION OF RADIATION EXPOSURE FROM NATURALLY OCCURRING RADIONUCLIDES IN FOOD AND FOODSTUFF

   University essay from

   Author : Ida Bengtsson; [2022-01-13]
   Keywords : Medical physics; Naturally occurring radionuclides; committed effective dose from ingested radionuclides; Biokinetic models;

   Abstract : Purpose: The main purpose of this study was to provide an estimation of the committed effective dose received by the Swedish population from naturally occurring radionuclides (NORM) in the diet. This study was also aiming to investigate the impact on the committed effective dose due to the new developments in the biokinetic model for Po 210 . READ MORE

6. 5. Establishment of a deep learning algorithm for dosimetry of radiopharmaceuticals

   University essay from

   Author : Dennis Lipnicevic; [2022-01-13]
   Keywords : Medical physics; automated segmentation; dosimetry; kidney; nuclear medicine dosimetry; deep learning; convolutional neural network;

   Abstract : Purpose: The aim of this study was to introduce a volumetric convolutional neural network for segmentation of the kidneys in SPECT images and to apply it in the dosimetry of radiopharmaceuticals of this organ, in order to decrease segmentation time and to standardize the segmentation of the kidneys. Method: Three networks were trained using two network architectures and a total of 216 retrospectively collected images from patients that underwent imaging procedures at Sahlgrenska University Hospital between 2009 and 2018. READ MORE