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You searched for subject:(UVP measurements). Showing records 1 – 3 of 3 total matches.

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1. Rahman, MD. Mashuqur. In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method.

Degree: Soil and Rock Mechanics, 2010, KTH

In underground construction grouting is performed to seal tunnels and caverns against excessive water inflow or to reduce the lowering of the ground water table. The rheological properties, such as viscosity and yield stress, of the used grouts play a fundamental role in grouting. No method has been developed yet to measure these properties in-line in the field during grouting. Methods used today are rather primitive and not robust enough for field use and they are mainly performed in order to verify and fulfil stipulated quality criteria. Modern grouting rigs are today equipped with continuous measurement of flow and pressure but instruments for continuous monitoring of rheological properties and their changes with time in the field are still lacking. A relatively new method, known as ‘UVP-PD’, for continuous in-line measurements of the rheological properties of cement grouts, was tested in this work. Standard grouting equipment (UNIGROUT) and flow meter (LOGAC) was used to ensure field conditions. The objective of this work was to determine the feasibility of the ‘UVP-PD’ method for cement based grouts. After performing full scale experimental works, this method was found feasible for measuring the rheological properties of cement based grouts directly in-line.

Subjects/Keywords: Rheology; In-line measurements; Cement grouts; UVP-PD method

measurements and studies using the UVP-PD application. Limitations involved in the current work are… …Techniques . . . . . . . 27 4.1 Off-Line Measurements of the Rheological Properties of… …Laboratory measurements . . . 4.1.2 Field measurements of rheological properties… …Ultrasound Velocity profiling (UVP) . . . . 51 6.1 Ultrasound doppler theory… …processing . 57 6.2.2 UVP monitor 6.1.1 The doppler effect . . . . . . . . . . 58… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Rahman, M. M. (2010). In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33878

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Rahman, MD Mashuqur. “In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method.” 2010. Thesis, KTH. Accessed May 19, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33878.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Rahman, MD Mashuqur. “In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method.” 2010. Web. 19 May 2019.

Vancouver:

Rahman MM. In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method. [Internet] [Thesis]. KTH; 2010. [cited 2019 May 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33878.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rahman MM. In-Line Rheological Measurements of Cement Based Grouts Using the UVP-PD Method. [Thesis]. KTH; 2010. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33878

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


EPFL

2. Jenzer Althaus, Jolanda Maria Isabella. Sediment Evacuation from Reservoirs through Intakes by Jet Induced Flow.

Degree: 2011, EPFL

Reservoir sedimentation is worldwide a significant long term problem and requires in view of the current mitigation measures an alternative and more sustainable solution. This challenge motivated the present study with the purpose to develop an alternative efficient method to release sediment out of a reservoir. The concept is based on the release of sediment through the headrace tunnel and turbines whereby a special focus was set on the fine sediment in the area in front of the power intakes. Specific jet arrangements should provide the energy and generate the optimum circulation needed to maintain the sediment in suspension and enhance its entrainment into the power intakes during turbining sequences. This new idea was experimentally tested in a rectangular laboratory tank with the following dimensions: 2 m wide, 1.5 m high and 4 m long. Two jet configurations were systematically investigated: a configuration of four jets arranged in a circle on a horizontal plane and a linear jet configuration located parallel to the front wall. The influence of the jet characteristics (nozzle diameter dj, jet velocity vj, jet discharge Qj, and jet angle θ) and the geometrical configuration parameters on the sediment release was investigated. As initial condition an almost homogeneous sediment concentration distribution was induced by air bubbles. This condition simulated a muddy layer like in front of the dam by the fading of a turbidity current. The water level during all the experiments was held constant by releasing the same discharge through the water intake as was introduced by the jets (experiments with jets) or through the back wall (experiments without jets), respectively. Turbidity measurements combined with flow velocity measurements gave information about the sediment release efficiency. The sediment release (evacuated sediment ratio, ESR) is defined as the evacuated sediment weight Pout divided by the sediment weight initially supplied Pin and represents the normalized temporal integral of the released sediment amount: ESR = Pout/Pin. Analogously, the settled sediment ratio is the settled sediment divided by the sediment weight initially supplied Pin. Experiments without jets as reference configuration showed an almost linear relation between the sediment release and the discharge within the tested range: the higher the discharge, the higher the evacuated sediment ratio. For a constant discharge the ultimate sediment release as well as the settled sediment ratio was easily estimated by a simple physical approach taking into account the settling velocity and the flow field generated by the discharge through the water intake and the back wall. For the tested discharge range the sediment release was between 0.09 and 0.37 for … Advisors/Committee Members: Schleiss, Anton, De Cesare, Giovanni.

Subjects/Keywords: reservoir sedimentation; suspended sediment; sediment release; resuspension; circular jet arrangement; UVP-measurements; turbidity measurements; axial mixer-like flow pattern; radial mixer-like flow pattern; jet mixing; numerical simulation; physical experiments; hydro-power plants; turbidity current; sédimentation des réservoirs; sédiments en suspension; évacuation des sédiments; re-suspension; arrangement circulaire de jets; mesures UVP; mesures de turbidité; champs de vitesse de type mélangeur axial; champs de vitesse de type mélangeur radial; mélanges de jets; simulation numérique; expériences physiques; aménagements hydrauliques; courants de turbidité

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jenzer Althaus, J. M. I. (2011). Sediment Evacuation from Reservoirs through Intakes by Jet Induced Flow. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/154766

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Jenzer Althaus, Jolanda Maria Isabella. “Sediment Evacuation from Reservoirs through Intakes by Jet Induced Flow.” 2011. Thesis, EPFL. Accessed May 19, 2019. http://infoscience.epfl.ch/record/154766.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Jenzer Althaus, Jolanda Maria Isabella. “Sediment Evacuation from Reservoirs through Intakes by Jet Induced Flow.” 2011. Web. 19 May 2019.

Vancouver:

Jenzer Althaus JMI. Sediment Evacuation from Reservoirs through Intakes by Jet Induced Flow. [Internet] [Thesis]. EPFL; 2011. [cited 2019 May 19]. Available from: http://infoscience.epfl.ch/record/154766.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jenzer Althaus JMI. Sediment Evacuation from Reservoirs through Intakes by Jet Induced Flow. [Thesis]. EPFL; 2011. Available from: http://infoscience.epfl.ch/record/154766

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


EPFL

3. Amini, Azin. Contractile floating barriers for confinement and recuperation of oil slicks.

Degree: 2007, EPFL

Marine oil spills can cause serious environmental damages to natural resources and to those whose sustenance depends upon these resources. Unfortunately experience shows that even the best efforts have not prevented occasional occurrences of major accidents on the sea. As long as massive oil spills are probable, special techniques and equipments will remain essential to facilitate spill cleanup in coastal regions. Oil spill containment booms are the most commonly adopted techniques to collect and contain oil on the sea surface, or to protect specific areas against slick spreading. Recently, an anti-pollution boom called the Cavalli system, has been designed with the intention of preventing the spread of spilled oil by trapping it inside a flexible floating reservoir and improving the pumping operation by decreasing the reservoir surface, and consequently increasing the oil layer thickness. Although flexible barriers have become increasingly common as a cleanup facility, there is no more than inadequate elaborate knowledge about their behavior. According to an extensive literature review, most of existing researches, either physical or numerical, have been done for rigid barriers. The main motivation for introducing the present research project is to study the efficiency and operational limits of the Cavalli system. However, the objectives are not constrained to this particular case. The present investigation focuses on the behavior of flexible barriers containing spilled oil. Previous researches of containment booms, even for the case of rigid barriers, have been mainly carried out in calm water. Accordingly, the main concentration is devoted to the response of a flexible barrier in presence of sea waves. Both experimental and numerical approaches were pursued to evaluate the efficiency limits and behavior of flexible barriers. Two-dimensional experiments have been carried out in a laboratory flume 6.5 m long, 1.2 m deep, and 12 cm wide. Flexible and rigid barriers containing rapeseed oil were examined, with and without waves. As the first step, the behavior of a flexible barrier in currents without waves was studied and compared to that of a rigid barrier. The key challenge was to contain the oil behind a flexible barrier that can freely deform in the water flow. This could be achieved using a slitted side skirt on the boom where it faces the lateral wall of the flume. The failure mode observed for rapeseed oil was entrainment failure. The initial failure velocity of different experimental conditions was studied and an empirical relationship was suggested in order to assess the maximum permissible oil-water relative velocity as a function of barrier draft and oil characteristics. The geometrical characteristics of the contained slick were examined and empirical equations were proposed to predict the slick length and headwave thickness as a function of contained oil volume. The second and more significant step was to conduct experiments with a flexible floating barrier in presence of five different waves. The… Advisors/Committee Members: Schleiss, Anton.

Subjects/Keywords: Oil spill containment boom; flexible barrier; two-phase fluid; entrainment failure; interfacial instability; Cavalli system; headwave; UVP measurements; LSPIV measurements; wave steepness; surging drainage; numerical simulation; fluid-structure interaction; drag coefficient; nappe d'hydrocarbure; barrière flexible; fluide multiphasique; limite d'entraînement; instabilités interfaciales; système Cavalli; mesures UVP; mesures LSPIV; cambrure de vague; drainage dû à la houle; simulation numérique; interaction fluide-structure; coefficient de traînée

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Amini, A. (2007). Contractile floating barriers for confinement and recuperation of oil slicks. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/111523

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Amini, Azin. “Contractile floating barriers for confinement and recuperation of oil slicks.” 2007. Thesis, EPFL. Accessed May 19, 2019. http://infoscience.epfl.ch/record/111523.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Amini, Azin. “Contractile floating barriers for confinement and recuperation of oil slicks.” 2007. Web. 19 May 2019.

Vancouver:

Amini A. Contractile floating barriers for confinement and recuperation of oil slicks. [Internet] [Thesis]. EPFL; 2007. [cited 2019 May 19]. Available from: http://infoscience.epfl.ch/record/111523.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Amini A. Contractile floating barriers for confinement and recuperation of oil slicks. [Thesis]. EPFL; 2007. Available from: http://infoscience.epfl.ch/record/111523

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.