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Dissertations / Theses on the topic 'Suction'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Mui, Tak Sang. "The shearing effect of suction /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20MUI.

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2

Åslund, Peter. "On Suction Box Dewatering Mechanisms." Doctoral thesis, KTH, Fiber- och polymerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4780.

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In previous studies on suction box dewatering, three mechanisms were identified that determine the dry content of a web, viz. web compression, displacement of water by air and rewetting. In the present work, the relative importance of the three mechanisms was investigated through direct measurement of the web deformation, the dry content changes during and after the suction pulse, the air flow through the fibre network and the saturation of the web after the suction pulse. Suction pressure, suction time and rewetting time were varied. The experiments were done with chemical and mechanical pulp
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3

Ulvestad, Anders. "Consolidation Settlement of Suction Caissons." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19504.

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Consolidation settlement analysis is an essential part of the design process for suction caissons. However it is a complex task since soil volume important for settlement analyses is directly affected by the installation process. Consolidation settlements have been found to be the critical design criterion in several subsea developments, adequate and correct analysis is therefore vital. The FEM code PLAXIS has been used to evaluate the reconsolidation process after completed installation of the suction caisson. Emphasize has been placed on studying the shear strength increase with time along t
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4

Guan, Yun. "The measurement of soil suction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq23989.pdf.

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5

Almgren, Birgitta. "Endotracheal Suction a Reopened Problem." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4798.

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6

Ridley, Andrew Martin. "The measurement of soil moisture suction." Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7933.

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7

Pinna, Rodney. "Buckling of suction caissons during installation." University of Western Australia. School of Civil Engineering, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0008.

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Suction caissons are a foundation system for offshore structures which offer a number of advantages over traditional piled foundations. In particular, due to the method of installation used, they are well suited for deep-water applications. The suction caisson consists of an open ended cylindrical shell, which is installed below the seabed in a sequence which consists of two loading phases. The caisson is first installed part way under self weight, with the installation being completed by lowering the pressure within the cylinder and thus allowing the ambient water pressure to force the caisso
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8

Wiklund, Pär-Eric. "Suction dynamics of axial piston pumps /." Stockholm, 1998. http://www.lib.kth.se/abs98/wikl0511.pdf.

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9

Yang, Shannon X. (Shannon Xuan). "Positive pressure induced channeled suction cups." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83829.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 39-40).<br>Leaking in water pipe is a critical issue in Middle Eastern countries such as Kuwait where water is scarce. In-pipe robots can be dispatched to discover the network and inspect the inner surface of the pipe. This thesis describes the design and characterization of suction pads for in-pipe robots. The suction cups are made of hyperelastic materials that contain air channels inside. Instead of using conventi
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10

Buchanan, Donna Lynn 1952. "SUCTION CATHETER PLACEMENT IN THE NEONATE DURING ENDOTRACHEAL SUCTION USING THREE HEAD POSITIONS (BRONCHIAL, CANNULATION, PULMONARY TOILET)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275533.

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11

Hubrich, Klaus. "Highly loaded compressor with boundary layer suction /." Lausanne : EPFL, 2005. http://library.epfl.ch/theses/?nr=3237.

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12

Gottschalk, Malte [Verfasser]. "Zur Beultragfähigkeit von Suction Buckets / Malte Gottschalk." Aachen : Shaker, 2017. http://d-nb.info/1138178322/34.

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13

Elgabu, Hesham M. "Critical evaluation of some suction measurement techniques." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/49627/.

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Suction is an important stress-state variable of unsaturated soils. The magnitude of suction affects the shear strength, the hydraulic conductivity, and the volume change behaviour of unsaturated soils. The measurement of soil suction is a prerequisite for the characterisation of unsaturated soils. Soil suction can be determined either by adopting direct or indirect measurement techniques. Despite several techniques available currently for measuring and controlling matric and total suctions of soils in the laboratory, several aspects related to various suction measurement techniques, such as t
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14

Byrne, Byron Walter. "Investigations of suction caissons in dense sand." Thesis, University of Oxford, 2000. http://ora.ox.ac.uk/objects/uuid:64c30b2e-155c-4642-9115-5e2bf5667af5.

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Offshore structures are used in a variety of applications ranging from the traditional oil and gas extraction facilities to emerging renewable energy concepts. These structures must be secured to the seabed in an efficient and cost effective manner. A novel approach is to use shallow inverted buckets as foundations, installed by suction, in place of the more usual piles. These foundations lead to cost savings through reduction in materials and in time required for installation. It is necessary to determine how these foundations perform under typical offshore loading conditions so that design c
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15

Tessler, Thomaz Martino. "Weather downtime analysis for cutter suction dredgers." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-26012017-092026/.

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The dredging activity is increasing worldwide due to ships that require bigger drafts, and consequently deeper navigation channels. Some dredging projects requires the operation of cutter suction dredgers on open waters, once these are capable of removing compact sediments and rocks while still maintaining a good productivity. These facts motivated the creation of a weather driven downtime prediction software for this type of operation, based on simplified calculations of the main dredging systems of a CSD. The motions caused by waves, and the forces and moments caused on these dredgers by win
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16

El-Gharbawy, Sherif Lotfy. "The pullout capacity of suction caisson foundations /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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17

Jones, Brendan. "The suction characteristics of power steering pumps." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299810.

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18

Westraad, Delme. "Suction induced shear strength of gold mine tailings." Diss., Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-06102005-092115.

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19

Power, Kenton C. "Suction and compressibility characteristics of an unsaturated till." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27012.

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Most geotechnical projects involving compacted soils are typically in a state of unsaturated condition. However, compressibility characteristics of such soils are typically estimated extending the principles that are commonly used for saturated soils. The compressibility and settlement characteristics of compacted soils are influenced by several parameters such as the applied loading, water content, compaction energy and soil structure. All the above parameters are in turn influenced by matric suction, which is one of the stress state variables for interpreting the engineering behavior of unsa
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20

Supachawarote, Chairat. "Inclined load capacity of suction caisson in clay." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0188.

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This thesis investigates the capacity and failure mode of suction caissons under inclined loading. Parametric finite element analyses have been carried out to investigate the effects of caisson geometry, loading angle, padeye depth (i.e. load attachment point), soil profile and caisson-soil interface condition. Displacement-controlled analyses were carried out to determine the ultimate limit state of the suction caissons under inclined load and the results presented as interaction diagrams in VH load space. VH failure interaction diagrams are presented for both cases where the caisson-soil int
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21

Svenmarker, Staffan. "Heparin coating and cardiotomy suction in cardiopulmonary bypass." Doctoral thesis, Umeå : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-134.

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22

Abbott, Helen Amanda. "Permeability and suction characteristics of compacted unbound aggregates." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278345.

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23

Lourenço, Sérgio Duarte Nunes. "Suction measurements and water retention in unsaturated soils." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/1331/.

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Techniques for testing unsaturated soils have been investigated by the author where the measurement and control of parameters were undertaken directly. Suction was measured and controlled with a new high suction tensiometer and water content through mass measurements with a balance. These techniques have been used for the determination of soil water retention curves and for the development of a suction . control system using air circulation and water injection. The techniques allow the soil to be subject to the same drying and wetting conditions that occur in nature and avoid the need for elev
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24

Kessens, Chad C. "A Self-Sealing Suction Technology for Versatile Grasping." Thesis, University of Maryland, College Park, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10844746.

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<p> This thesis describes the design, development, and evaluation of a novel "self-sealing" suction technology for grasping. As humans desire robots capable of handling an increasingly diverse set of tasks, end effectors that are able to grasp the widest possible range of object shapes and sizes will be needed to achieve the desired versatility. Technologies enabling the exertion of local pulling contact forces (e.g. suction) can be extraordinarily useful toward this end by handling objects that do not have features smaller than the grasper, a challenge for traditional grippers. However, simpl
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25

Van, Sintern Wolff H. "Investigation of suction recirculation in rocket pump inducers." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08292008-063509/.

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26

Mahaffey, Ross M. "Review and optimisation of pump suction reducer selection." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46255.

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The approach flow to a pump must be undisturbed and free from unequal velocity distributions, unequal pressure distributions, entrained air or gas bubbles, vortices and excessive pre-swirl. A reducer fitting is typically used in pump station pipe work to reduce the size of the suction pipe to match the size of the pump suction end flange. Two types of reducer fittings are commonly manufactured, namely: Eccentric Reducers and Concentric Reducers. Inlet pipework design guidelines traditionally prescribe the use of eccentric reducers, with the flat side on top. This prescription is to allow
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27

Leathrum, Travis. "Modular auger design to prevent clogging in suction." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123283.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 47-48).<br>A mechanical design was conducted for a modular auger system that reduces the risk of clogging in suction piping meant to process sargassum seaweed. The auger supports a slurry pump-based system being designed to address sargassum blooms adversely affecting beaches in the Caribbean. By reducing clogging, the auger will prevent damage to the pump and reductions in productivity. A mathematical model of th
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28

Lewis, Joshua Mark. "Measuring the effects of cutter suction dredge operating parameters on minor losses due to fixed screens installed at the suction inlet." Thesis, Texas A&M University, 2014. http://hdl.handle.net/10945/44419.

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CIVINS<br>One of the most efficient and versatile types of modern dredges is the cutter suction dredge. Specific regulations mandate the placement of screens over the suction mouth during dredging operations to prevent ordnance, wildlife, and other debris from entering the system; however, these screens change the operational capability of the dredge in the form of an additional minor loss. The goal of this experiment was to determine the effects of different dredge operating parameters – cutter head speed, ladder arm swing speed, flow rate, and screen opening area ratio – on a screen’s
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29

BUTTICE', Vincenzo. "VOLUMETRIC BEHAVIOUR OF SOILS EXPERIENCING WIDE CHANGES IN THE DEGREE OF SATURATION." Doctoral thesis, Università degli Studi di Palermo, 2021. http://hdl.handle.net/10447/499197.

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30

Kassem, Emad Abdel-Rahman. "Measurements of moisture suction in hot mix asphalt mixes." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4259.

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The presence of moisture in hot mix asphalt (HMA) causes loss of strength and durability of the mix, which is referred to as moisture damage. This study deals with the development of experimental methods for measuring total suction in HMA, which can be defined as the free energy state of water in HMA mixes. The total suction is related to the ability of moisture to get into the mix under unsaturated conditions; it is also related to the ability of the mix to retain moisture. Soil suction has been studied extensively. However, suction in HMA as a porous material and its relationship to moisture
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31

Colmenares, Montanez Julio Estaban. "Suction and volume changes of compacted sand-bentonite mixtures." Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/7775.

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32

Dineen, Kieran. "The influence of soil suction on compressibility and swelling." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/45469.

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This thesis presents a study into the influence of suction on the compressibility and swelling characteristics of a broad range of reconstituted clay soils. Soil water relationships are explored, discussing evaporation, shrinkage, swelling and the development of suction. A comprehensive review of suction measurement techniques is detailed, identifying operating principles, performance and limitations of each technique. For the main experimental programme a new, osmotically suction controlled oedometer has been developed. The oedometer utilises the osmotic potential of a large molecular weight
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33

Ghariani, Samia. "Experimental study of wind induced suction on flat roofs." Thesis, University of Ottawa (Canada), 1991. http://hdl.handle.net/10393/7540.

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A 1:10 scale model building previously tested in the NRCC 9$m \times 9m$ wind tunnel was reproduced with a more exaggerated scale of 1:100 in a smaller wind tunnel and tested. Also tested was a half of the building cut along the line of symmetry and with various heights. The purpose of the testing was (1) to examine the repeatability of the roof pressure patterns with a more exaggerated scaling factors, and (2) to explore the feasibility of using a portion of the building for the testing of structural details against wind action. It was confirmed that the proposed simulation of only a half or
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34

Heidarpour, Manouchehr. "Turbulent flow in a porous tube with wall suction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28345.pdf.

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35

de, Ruyter Marcus J. M. "Two-dimensional cut plan optimization for cutter suction dredgers." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/79367/.

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Optimal cut plans for cutter suction dredgers aim to maximize operational efficiency. Maximizing operational efficiency involves minimization of stoppage time resulting from non-productive dredger movements. To automate a systematic search for optimal twodimensional cut plans for cutter suction dredgers two models with an adaptive simulated annealing-based solution approach were developed. The first model, the dredge cut nesting model, optimizes irregular stock cutting problems where stencils represent dredge cuts and sheets represent dredging areas. Stencils are collections of unit dredge cut
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36

Wångby, Emil. "Transport of non-spherical particles in pipeflow with suction." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79806.

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The interest of how small non-spherical particles transport behaviour when transported in pipe-flow is of large interest in a variety applications. This kind of theory have been used when studying composite manufacturing and how particles behaves in the human lungs. The main focus is to study the statistical deposition rate in a flow-field with and without capillary action and gravity. Two kind of particle shapes are of main interest which are prolate and oblate spheroids. In this study the method of vector projection is used to track particle orientation instead of the more common methods of
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37

Khapko, Taras. "Transition to turbulence in the asymptotic suction boundary layer." Licentiate thesis, KTH, Stabilitet, Transition, Kontroll, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141344.

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The focus of this thesis is on the numerical study of subcritical transition to turbulence in the asymptotic suction boundary layer (ASBL). Applying constant homogeneous suction prevents the spatial growth of the boundary layer, granting access to the asymptotic dynamics. This enables research approaches which are not feasible in the spatially growing case. In a first part, the laminar–turbulent separatrix of the ASBL is investigated numerically by means of an edge-tracking algorithm. The consideration of spanwise-extended domains allows for the robust localisation of the attracting flow struc
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38

Song, Zhenhe. "Pullout behaviour of suction embedded plate anchors in clay." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/2173.

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In recent years oil and gas mining has moved into increasingly deeper water in search of undeveloped fields. As water depths approach and exceed 3000 m conventional offshore foundation systems become inefficient and ineffective in stabilising platforms and floating production storage units. The trend of supporting structure design in deep water has been to install catenary and taut leg mooring systems. Consequently, many types of anchoring systems are being developed and used in order to withstand large mooring forces. The SEPLA (Suction Embedded Plate Anchor) is ideal for use in this situatio
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39

Song, Zhenhe. "Pullout behaviour of suction embedded plate anchors in clay." Curtin University of Technology, Dept. of Civil Engineering, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18648.

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In recent years oil and gas mining has moved into increasingly deeper water in search of undeveloped fields. As water depths approach and exceed 3000 m conventional offshore foundation systems become inefficient and ineffective in stabilising platforms and floating production storage units. The trend of supporting structure design in deep water has been to install catenary and taut leg mooring systems. Consequently, many types of anchoring systems are being developed and used in order to withstand large mooring forces. The SEPLA (Suction Embedded Plate Anchor) is ideal for use in this situatio
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40

Leivo, T. (Tomi). "Basement membrane zone proteins, epithelial integrins and TGF-β system in reepithelialization, dermatitis herpetiformis and psoriasis:modulation by isotretinoin, betamethasone and calcipotriol". Doctoral thesis, University of Oulu, 2000. http://urn.fi/urn:isbn:951425712X.

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Abstract TGF-βs are cytokines that signal through the receptor complex of type I and type II receptors. Hemidesmosome (BP180, BP230, plectin/HD1, α6β4 integrin), anchoring filaments (laminin 5), and anchoring fibrils (collagen VII) form a hemidesmosomal adhesion complex that provides stable adherence of keratinocytes to the epidermal basement membrane. Nidogen, collagen IV, and laminins are components of the basement membrane, integrins are cell adhesion molecules, and tenascin-C is a matrix protein. The expression of TGF-β receptors I and II was studied in normal epidermis and lesional and n
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41

Van, Heerden Jacobus Hendrik Francois. "Direct measurement of pore fluid suction in gold mine tailings." Diss., Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-09212005-135324/.

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42

Chen, Wen. "Uniaxial behaviour of suction caissons in soft deposits in deepwater." University of Western Australia. School of Civil and Resource Engineering, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0136.

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Suction caissons are a cost-effective alternative to traditional piles in deep to ultradeep waters. No design rule has been available on the axial capacity of suction caissons as part of the mooring system in soft sediments. In this research, a series of centrifuge tests were performed using instrumented model caissons, to investigate the axial capacity and radial stress changes around caissons during installation, consolidation and vertical pullout in normally consolidated, lightly overconsolidated and sensitive clays. Total pressure transducers instrumented on the caisson wall were calibrate
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43

Cotter, Oliver. "Installation of suction caisson foundations for offshore renewable energy structures." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534163.

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44

Dekker, Marijn Johannes. "The Modelling of Suction Caisson Foundations for Multi-Footed Structures." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27161.

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Suction caissons are a type of offshore foundation that allow for fast and noise-free installation and decommissioning of offshore structures. They have been used for 20 years in the oil and gas industry and are also becoming more common in the offshore wind sector as a promising way to cost reduction. SPT is a leading contractor for the installation of both single anchor piles and foundations on multiple caissons. The suction caissons are installed by applying a differential pressure between the inner and outer sides of the caissons, which pushes the caissons into the soil. When a platform is
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45

Reijnen, Duncan P. (Duncan Peter). "Experimental study of boundary layer suction in a transonic compressor." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10754.

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46

Merchant, Ali A. (Ali Abbas). "Design and analysis of supercritical airfoils with boundary layer suction." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10987.

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47

Bobke, Alexandra. "Simulations of turbulent boundary layers with suction and pressure gradients." Licentiate thesis, KTH, Linné Flow Center, FLOW, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185275.

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The focus of the present licentiate thesis is on the effect of suction and pressure gradients on turbulent boundary-layer flows, which are investigated separately through performing numerical simulations.The first part aims at assessing history and development effects on adverse pressure-gradient (APG) turbulent boundary layers (TBL). A suitable set-up was developed to study near-equilibrium conditions for a boundary layer developingon a flat plate by setting the free-stream velocity at the top of the domain following a power law. The computational box size and the correct definition of the to
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48

Stanley, Mary Helen. "Suction Cup Lysimeter Method for Extracting Pine Bark Substrate Solution." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/42244.

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The objective of this study was to determine the effectiveness of suction cup lysimeters (SCL) in extracting substrate solution from pine bark substrates. Lysimeter types tested were 4.8-cm diameter with a ½ or 1-bar air-entry value (AEV) and 2.2-cm diameter also with a ½ or 1-bar AEV. Sufficient volume could be obtained when a vacuum pressure of 30, 40 or 50 cb was applied to lysimeters with a minimum extraction time of five minutes. The 2.2-cm lysimeters were found to be suitable for extracting solution if smaller sample volumes were needed. To determine effect of vacuum pressure and e
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49

Brucia, Josephine Jacobs. "The effect of suction catheter insertion on head-injured adults." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060867440.

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50

Register, Craig H. "A survey of neonatal suction techniques performed by registered nurses." Huntington, WV : [Marshall University Libraries], 2002. http://www.marshall.edu/etd/descript.asp?ref=128.

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