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- Ståhlberg, F., et al.
(författare)
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Method for quantification of low flow velocities by magnetic resonance phase imaging.
- 1986
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Ingår i: Acta Radiologica. Supplementum. - 0365-5954. ; 369, s. 486-489
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to compare the influence of flow in the velocity range 0 to 25 mm/s on modulus, phase, real and imaginary images obtained with a standard magnetic resonance scanner (Siemens Magnetom, 0.5 T), and to develop a simple method for determination of flow velocities in vivo from this information. Using a flow phantom, the flow dependent magnetic resonance imaging (MRI) signal has been studied as a function of flow perpendicular to the image slice with non-doped water (simulating moving cerebrospinal fluid) as well as with water doped with Mn2+ (simulating moving blood) for each of the four mentioned image types. The results show a marked flow dependence on all types of images studied. The variation of the signal with flow in the modulus images is relaxation-time dependent in the studied velocity range and it is non-monotone for non-doped water. In the phase images, however, the variations are monotone and not dependent on relaxation times. In modulus images the curve shape is relatively independent on flow direction, while phase images are clearly dependent on flow direction in the studied velocity range. The signal versus velocity curves for the real and imaginary images show resemblance to those for the modulus and the phase images, respectively. It is concluded that the phase information can be used to generate a signal versus velocity calibration curve, which can be used to quantify low flow velocities in vivo.
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- Trollfors, B, et al.
(författare)
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Aetiology of acute epiglottitis in adults
- 1998
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Ingår i: Scandinavian journal of infectious diseases. - : Informa UK Limited. - 0036-5548. ; 30:1, s. 49-51
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Tidskriftsartikel (refereegranskat)
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- Al-Madhlom, Qais, et al.
(författare)
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Site Selection Criteria of UTES Systems in Hot Climate
- 2019
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Ingår i: Proceedings of the XVII ECSMGE-2019. - Iceland : The Icelandic Geotechnical Society (IGS). ; , s. 1-8
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Konferensbidrag (refereegranskat)abstract
- Underground Thermal Energy Storage UTES systems are widely used around the world. The reason is that UTES is essential in utilizing Renewable Energy sources (RE). The efficiency of the energy system relies strongly on the efficiency of the storage system. Therefore, in the installation of a hyper-energy system, a lot of attention is to be paid in improving the storage system. In order to design an efficient storage system, firstly, standard criteria are to be investigated. These explain the process of making high efficiency storage system that must be specified. The criteria, mainly, depends on: best type and best location. These two variables are in high interference with each other. The bond between the two variables is represented by the geological, hydrological, meteorological, soil, hydrogeological properties/factors of the site. These factors are specified by geo-energy mapping. Despite the importance of this type of mapping, there is no specific criteria/formula that defines the choice. This paper aims to: give a brief literature review for UTES systems (types, classification, advantages/disadvantages for each type, and examples of an installed system). In addition, some factors within geo-energy mapping are highlighted and standard criteria to achieve good storage system are suggested. The suggested criterion comprises a process to transfer the quantity values to quality values according to the expert opinion. The suggested criteria are defined through the following stages: selecting the best type of UTES systems according to hydro-geological in site conditions; using the analytical hierarchy process to rank the best location to install the storage system and then using ArcMap (GIS-Software) to provide representative results as maps. Karbala Province (Iraq) is the study area used here
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- Amara, Sofiane, et al.
(författare)
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Concentration heating system with optical fiber supply
- 2011
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Ingår i: Energy Procedia. - : Elsevier BV. - 1876-6102. ; 6, s. 805-814
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports on an experimental realization and field testing of a recently proposed solar fiber optic mini dish light concentrator connected to a hot water accumulator. The prototype dish is 150 cm in diameter. In repeated test the collected and concentrated sunlight was transported in a one millimeter diameter optical fiber to a selective surface in the storage tank. This surface absorbs the radiation which remains trapped inside as it heat exchanges with tank fluid which temperature can reach 70 °C.
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- Amara, S., et al.
(författare)
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Experimental study of a concentration heating system with optical fiber supply
- 2009
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Ingår i: Abstract book and proceedings : Effstock 2009. - Stockholm : Energi- och Miljötekniska Föreningen / EMTF Förlag.
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Konferensbidrag (refereegranskat)abstract
- The buildings thermal function is important to provide comfort to its tenants. This means to provide cooling during hot seasons and/or heating in cold season. Current study concerns modelling of a new design of thermal photo sensors that results in a more efficient heating for Tlemcen site, Algeria.
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