Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 96 for “"absorption rate"”.
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Modeling and calculation of the specific absorption rate for multi-antenna mobile devices
… human exposure to the RF radiation, the specific absorption rate (SAR) is introduced as a measure. Regulatory agencies have standards limiting the maximum SAR to ensure safety. In order to comply with the regulations, the SAR induced in the human head and body should be evaluated by experimental …
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Fast simulation of E1, B1 and Specific Absorption Rate for 7T MRI with the use of graphical processors
Specific Absorption Rate (SAR) is a dominant constraint in high field MR, and has been a topic of much recent interest with developments of parallel transmission systems (pTx). While real-time estimates of local SAR over large volumes as well as SAR-constrained pTx RF design are highly desirable …
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IMAGING SPECIFIC ABSORPTION RATE WITH MR THERMOMETRY USING PARAMAGNETIC LANTHANIDE COMPLEXES AND IN VIVO GABA MR SPECTROSCOPY IN MOVEMENT DISORDERS
… in vivo (MRS). This dissertation focuses separately on the development, application and quantitation issues of these two aspects of MRI.
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Balanced antennas for mobile handset applications. Simulation and Measurement of Balanced Antennas for Mobile Handsets, investigating Specific Absorption Rate when operated near the human body, and a Coplanar Waveguide alternative to the Balanced Feed.
… on the mobile phone ground plane. The specific absorption rate (SAR) performance of the antenna is also studied experimentally by measuring antenna near field exposure. The measurement results are correlated with the calculated ones. A new dual-band balanced antenna using coplanar waveguide …
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Investigation, design and implementation of circular-polarised antennas for satellite mobile handset and wireless communications. Simulation and measurement of microstrip patch and wire antennas for handheld satellite mobile handsets and investigations of polarization polarity, specific absorption rate, and antenna design optimization using genetic algorithms.
… antennas are investigated and discussed to operate at L band (1.61-1.6214GHz) and ISM band (2.4835-2.5GHz) A substantial size reduction was achieved compared to conventional designs by introducing special modifications to the antenna geometries. Most of the antennas are designed to produce …
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Absorption enhancement of plasmonic thin film solar cell combined with nanocavity
… a lot of attention from researchers for their absorption capabilities. This study focused on the design of plasmonic thin film solar cell so that the absorption can be optimized. The structures were developed with different materials, geometries and configurations through Finite Element Method …
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Experimental and theoretical study of carbon dioxide absorption into potassium carbonate solution promoted with enzyme
… into the environment. Currently, CO2 chemical absorption using monoethanolamine (MEA) as a solvent is the best available option for CO2 capture from flue gas streams. The issue with this technology is the high capture cost which ranges from $50/metric ton to $70/metric ton CO2 avoided. Energy …
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Development of a System of MEA Solutions Activated by Novel Poyamines for Natural Gas Sweetening Mass Transfer in Absorber and Desorber Columns
… to have high CO2 loading as well as high absorption rate. As branched polyethyleneimine (PEI-B) (MW ≈ 800 with almost 16 amino groups) showed a superior performance in adsorption applications for capturing CO2, it was important to test its performance in absorption process. …
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ΜΕΛΕΤΗ ΤΗΣ ΒΙΟΙΣΟΔΥΝΑΜΙΑΣ ΙΔΙΟΣΚΕΥΑΣΜΑΤΩΝ ΑΣΠΙΡΙΝΗΣ ΠΟΥ ΚΥΚΛΟΦΟΡΟΥΝ ΣΤΗΝ ΕΛΛΑΔΑ
… ON WHICH THE COMPARATIVE STUDY WAS BASED ARE: ABSORPTION RATE CONSTANT (KA), ELIMINATION RATE CONSTANT (KE), AREA UNDER THE CURVE ([AUC] ), MAXIMUM CONCENTRATION (T MAX), ABSORPTION HALF LIFE (T 1/2/ KA) AND ELIMINATION HALF LIFE (T 1/2 /KE). IT WAS PROVED THAT (1) NONE OF THE ABOVE PRODUCTS …
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Preparation and Characterization of a Treated Montmorillonite Clay and Epoxy Nanocomposite
… by weight montmorillonite. Samples that were saturated with water showed lower moduli due to the epoxy matrix. The greatest moisture absorption rate was found at 7%, the least at 3%.
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A Comparison Study of Carbon Dioxide Absorption Performance in MEA and Blended Amine Solvents for Post-combustion Process: Experiment, Modeling and Simulation
… single amine solvents for the CO2 chemical absorption process for improving absorption performance and reducing the investment and operating costs. In this research, the CO2 absorption performance of aqueous MDEA/PZ blends and aqueous MEA/MDEA/PZ blends were comprehensively investigated …
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Self-organized fine-tuned response in a driven spin glass
… resulting in macroscopic quantities like work absorption rate and internal energy decreasing as compared to the near-equilibrium distribution. Which spins fall into which categories is specific to a particular realization of the external drive; changing to another drive changes which spins are …
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Development of solvent for CO2 capture for utilization in concrete and storage in geological formations
… the solvents was evaluated in terms of initial absorption rate, solvent precipitation and CO2 equilibrium loading. To present the best performing solvents as commercial products, the selected solvents were further optimized concerning solvent concentration, precipitation, CO2 partial pressure …
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Impact of engineered nanoparticles on the growth of roots
… to the soil in high quantity and have a slow absorption rate in plants. In comparison engineered nanoparticles can be highly attractive as fertilizers as their small size will allow faster absorption. In particular, iron oxide-based nanoparticles will be highly promising as Fe-deficiency …
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Evaluation of the performance of corrugated shipping containers : virgin versus recycled boards
… same ring crush values. The effect of moisture absorption rate by materials on the creep rate was investigated also. The results revealed that exposure to the high and cyclic relative humidity conditions used in this study caused significant reduction in compression strength for both box types. …
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IDENTIFICATION OF Cav 3.2 T-TYPE VOLTAGE GATED CALCIUM CHANNELS AS KEY MEDIATORS OF TARGETED INHIBITION OF HEPATOCELLULAR CARCINOMA BY AMPLITUDE-MODULATED RADIOFREQUENCY ELECTROMAGNETIC FIELDS
… of action w e have a ssessed the Specific Absorption Rate (SAR) level and dis tribution inside the human body . Additionally, we performed various i n vitro and in vivo experiments that were exposed to HCC - specific AM RF EMF using systems replicating human exposure levels and treatment …
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Evaluation of nanoparticles-based thermotherapy for cancer
… iron oxide nanoparticles can be used to generate heat for the treatment of cancer. With suitable coating, these nanoparticles are biocompatible, stable in solution, and absorbed by tumor cells in good contrast. The mechanism of heating is mainly due to Neel relaxation process and a quantity …
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Theoretical prediction of drug release in GI tract from spherical matrix systems
… in their ability to deliver the drug at a steady rate thus reducing the dosage interval and providing a prolonged pharmacodynamic effect. But despite the steadily increasing practical importance of these devices, little is known regarding their underlying drug release mechanisms. Mathematical …
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An Underwater Vehicle Navigation System Using Acoustic and Inertial Sensors
… of acoustic signals that have a lower absorption rate and a more extended propagation distance than electromagnetic signals underwater. The significant disadvantage of the INS is the “drift,” the unbounded error growth over time in the outputs. This thesis is aimed to study and test a …
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