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Дисертації з теми "Structure porale complexe"

Автор: Grafiati
Опубліковано: 16 листопада 2024

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1

Yacouba, Amani Abdoul Nasser. "Approche multi-géophysique pour la caractérisation de la fracturation et des propriétés de transport des roches carbonatées." Electronic Thesis or Diss., Orléans, 2024. http://www.theses.fr/2024ORLE1024.

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Анотація:
Dans un contexte de changements globaux et de transitions écologiques et énergétiques, le changement climatique induit une sècheresse récurrente et de crise de la ressource en eau dans plusieurs régions et continents. Il est donc crucial d'étudier les aquifères d'eaux douces afin d'accompagner ces transitions et assurer une gestion et une utilisation durable et raisonnée de cette ressource vitale. En l'occurrence, la zone vadose qui joue un rôle important dans la recharge de ces aquifères et le transfert d'éventuels polluants et d'intrants. La plupart du temps, cette zone non saturée en eau, s
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2

Bennett, Laura. "Community structure detection in complex biological networks." Thesis, King's College London (University of London), 2013. https://kclpure.kcl.ac.uk/portal/en/theses/community-structure-detection-in-complex-biological-networks(4a2e4275-b4c5-4598-85c3-cdfdbc213581).html.

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With the advent of high-throughput technology there has been a large increase in the availability of biological data, such as interaction data of genes, proteins and metabolites. It is therefore necessary to develop ways in which these data can be efficiently modelled and analysed. Networks over a natural modelling framework for complex biological systems and as such, network theory and related computational approaches have proven important in bioinformatics. A particular facet of network theory that has been employed to analyse biological networks is community structure detection. Community s
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3

Sivilich, Anjanette U. "Wheeler/Portage Nike missile launch site C-47 : historic structure report." Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1175435.

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Анотація:
This is a historic structure report for the C-47 Nike missile launch site in Wheeler, Indiana. This report provides a description, condition assessment, and recommendation for restoration of the site since it has sustained damage from weather, fire, and vandals. The site is listed on the State Register and National Register of Historic Places and the Nike Preservation Group desires to turn the site into a Cold War museum and memorial.A history of the Cold War and development of the Nike missile systems and C-47 site provides the background of the project. Each structure and feature is describe
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4

Willshaw, Stephen Kilgour. "On pattern-switching phenomena in complex elastic structures." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/on-patternswitching-phenomena-in-complex-elastic-structures(d013e89e-c413-4612-a1f7-9fc55739cdfb).html.

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Анотація:
We investigate global pattern-switching effects in 2D cellular solids in which the voids are arranged in a square lattice. Uniaxial compression of these structures triggers an elastic instability which brings about a period-doubling transformation of the void shapes at a critical strain. Specifically, a square array of circular voids forms a pattern of mutually orthogonal ellipses and a similar effect is observed for diamond-shaped voids. The onset of instability is governed by the void fraction and size-effects are found for the experimental samples. We establish empirical laws which characte
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5

Longdon, Alexander. "Stably complex structures on self-intersection manifolds of immersions." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/stably-complex-structures-on-selfintersection-manifolds-of-immersions(7ed7cb10-a143-4638-8447-6f4353388565).html.

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In this thesis we study the problem of determining the possible cobordism types of r-fold self-intersection manifolds associated to self-transverse immersions f: M^{n-k} -> \R^n for certain values of n, k, and r. Namely, we study the double-point self-intersection manifolds of immersions M^{n+2} -> \R^{2n+2} and M^{n+4} -> \R^{2n+4}, focusing on the case when $n$ is even. In the case of self-transverse immersions f : M^{n+2} -> \R^{2n+2}, we see that when n is even the double-point self-intersection manifold is a boundary, which is a result originally due to Szucs. In the case of self-transver
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6

Hemming, Oliver. "Structure and reactivity of low-coordinate first-row transition metal complexes." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/structure-and-reactivity-of-lowcoordinate-firstrow-transition-metal-complexes(a7879b58-897e-4080-99f6-8551511a503a).html.

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Анотація:
Earth-abundant first-row transition metals have seen a renaissance in chemistry in recent years due to their relatively low toxicity and cost in comparison to precious metals. Furthermore open-shell transition metal complexes exhibit useful one-electron redox processes which contrasts to their heavier d block anologues. This thesis aims to synthesize and analyse the structure and reactivity of low-coordiante first-row transition metal complexes of from groups 7-9 with an aim to utilize these species in catalysis. The divalent compound [Co{N(SiMe3)2}2] reacts with the primary phosphines PhPH2 i
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7

Yuan, Daopeng. "Structural studies of human CD23 and its complexes." Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/structural-studies-of-human-cd23-and-its-complexes(b8946602-66b9-4b39-a02e-4cda67c1c26d).html.

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Анотація:
IgE plays a central role in the pathogenesis of immediate hypersensitivity reactions through interacting with its receptors, in particular the high affinity receptor FcεRI. The low-affinity IgE receptor, CD23, affects IgE-dependent immune responses by regulating the synthesis of IgE, facilitating allergen presentation to the immune system, and influencing the activation and differentiation of B- and T-cells. Surprisingly, CD23 is different from other Ig receptors and belongs to the C-type (calcium-dependent) lectin family. Calcium binding to CD23 affects IgE binding to CD23, but previous NMR a
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8

O'Brien, Kieran. "Electronic structure and bonding in pyrrolic macrocycle-supported complexes of actinides." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/electronic-structure-and-bonding-in-pyrrolic-macrocyclesupported-complexes-of-actinides(9c8ab96e-0e0d-4cca-aaa2-ef30102fbcc2).html.

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Анотація:
Chemistry of the early actinides has undergone a lot of developments in recent years, and due to the need of specialised laboratories to handle these often highly radioactive complexes, computational chemistry has become a powerful aid in understanding the physical properties of these unique systems. This thesis describes a systematic computational study of organoactinide and organometallic model complexes of the form [LAnX]n+ where L is the macrocyclic trans- calix[2]benzene[2]pyrrolide ligand using density functional theory (DFT) in conjunction with a variety of partition-based methods –
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9

Alsayary, Omar. "Group 4 and Group 10 post metallocene ethylene polymerization catalysis : catalyst structure-polymer properties relationship." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/group-4-and-group-10-post-metallocene-ethylene-polymerization-catalysis-catalyst-structurepolymer-properties-relationship(ae5d83a2-4e13-4b8c-b7cc-cf7d67667d3d).html.

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Анотація:
The new ligand L1 [2-[(E)-2,6-diisopropylphenyl-phenyimino]-2H-acenaphthylen-(1E)-ylidene]-(2,4,6-trimethyl-phenyl)-amine was prepared by stepwise addition of 2,6-diisopropylaniline and 2,4,6 trimethylaniline to acenaphthenequinone. The L1NiBr2 complex crystallized as a pseudo tetrahedral monomer, as determined by single crystal X-ray diffraction. This new catalyst L1NiBr2 and 3 related catalysts, bis(2,6-diisopropylphenyl)acenaphthenediimineNiBr2 (L2NiBr2), [(N,N'-bis-(2,6-diisopropylphenyl)-phenanthrene-9,10-diylidendiamineNi-η3-C3H4COOCH3)]+.{B[C6H3(CF3)2]4-} [(L3Ni-η3-C3H4COOCH3)]+.{B[C6H3
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10

Solomon, Sophia Astero. "Allyl and pentadienyl carbanion complexes of alkali metals : metal- and functionality-directed structure and bonding." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/allyl-and-pentadienyl-carbanion-complexes-of-alkali-metals-metal-and-functionalitydirected-structure-and-bonding(a88c30ae-8e8c-49e5-86d7-cc95569aab72).html.

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Анотація:
Five ansa-tris(allyl) complexes [(PhSi{C3H3(SiMe3)}3)(Li?tmeda)3] (2.1), [(MeSi{C3H3(SiMe3)}3)(Li?pmdeta)3] (2.2), [(MeSi{C3H3(SiMe3)}3)-(Na.tmeda)3] (2.3), [(PhSi{C3H3(SiMe3)}3)(Na?tmeda)2Na]2 [2.4]2 and [(MeSi-{C3H3(SiMe3)}3)(K?OEt2)2(KLi{OtBu})]2 [2.5]2 have been synthesised, and studied by X-ray crystallography and NMR spectroscopy. A collaboration was undertaken to study some of the complexes by DFT. Crystallographic studies have shown that the overall structure of the complex is dependent on a combination of several factors: the metal cation; the substituent on the central silicon atom f
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11

Sprick, Reiner Sebastian. "Polytriarylamines containing fused ring and heterocyclic structures prepared using N-heterocyclic carbene complexes of palladium." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/polytriarylamines-containing-fused-ring-and-heterocyclic-structures-prepared-using-nheterocyclic-carbene-complexes-of-palladium(c09188eb-490b-452c-945a-22979f58c76d).html.

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Анотація:
For the preparation of semiconducting polymers often ‘standard’ catalytic systems are used without further optimisation. New ligands, such as N-heterocyclic carbenes have shown excellent activity in cross-coupling reactions (e.g. Suzuki-Miyaura reaction, or Hartwig-Buchwald amination). These systems show excellent conversions under mild conditions and even allow the use of aryl chlorides as reagents. Nevertheless, previously no system has been reported for the synthesis of conjugated polymers, e.g. the Suzuki polycondensation or Buchwald-Hartwig type polycondensation using these catalysts. A N
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12

Guo, Liang. "Structural and functional studies of mitochondrial small Tim proteins." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/structural-and-functional-studies-of-mitochondrial-small-tim-proteins(03dde6fd-6692-4af5-9023-b85a33803fcd).html.

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Анотація:
Most mitochondrial proteins are encoded by nuclear DNA, and synthesised in the cytosol, then imported into the different mitochondrial subcompartments. To reach their destination, mitochondrial inner membrane proteins require import across the outer mitochondrial membrane, and through the intermembrane space. This passage through the IMS is assisted by the small Tim proteins. This family is characterised by conserved cysteine residues arranged in a twin CX3C motif. They can form Tim9-Tim10 and Tim8-Tim13 complexes, while Tim12 appears to form part of a Tim9-Tim10-Tim12 complex that is associat
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13

Roberts, Hannah Nike. "The use of molecular design to fine-tune the redox properties and electronic structure of half-sandwich group 6 metal acetylide complexes." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/the-use-of-molecular-design-to-finetune-the-redox-properties-and-electronic-structure-of-halfsandwich-group-6-metal-acetylide-complexes(622ea5ae-2d9c-4523-ace3-165e51e93be5).html.

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Анотація:
Chapter One introduces the chemistry of organometallic acetylide complexes, with a particular focus on complexes containing redox active half sandwich end-capping groups. Carbon chain complexes containing these auxiliaries are of particular interest for the development of molecular materials with: electronic, magnetic, luminescence and optical properties. An overview of the research undertaken in these areas and the spectroscopic analysis has been explored. Chapter Two describes the synthesis of the cycloheptatrienyl tungsten complexes: [W(C=CHR)(dppe)(η-C7H7)]+ and [W(C≡CR)(dppe)(η-C7H7)]. In
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14

Heaven, Graham. "Structural investigation of histidine domain protein tyrosine phosphatase and its interactions with endosomal sorting complexes required for transport." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/structural-investigation-of-histidine-domain-protein-tyrosine-phosphatase-and-its-interactions-with-endosomal-sorting-complexes-required-for-transport(80578bba-c1d7-4b88-8cab-02421913d660).html.

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Анотація:
Biogenesis of the multivesicular body (MVB) organelle is an important process for regulation of signalling in the cell. Signal receptors embedded within the outer MVB membrane can be sorted into intralumenal vesicles which bud away from the cytosol to within the MVB preventing further signalling. Sorting of receptors, invagination of the membrane and release of vesicles into the MVB lumen are mediated by the endosomal sorting complexes required for transport (ESCRT) along with a range of accessory proteins including histidine domain protein tyrosine phosphatase (HD-PTP). HD-PTP is a multidomai
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15

Awang, Draup Awang Jefri. "Numerical simulation of the structural response of friction stir welded aluminium 2139-T8 alloy subjected to complex loading configurations." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/numerical-simulation-of-the-structural-response-of-friction-stir-welded-aluminium-2139t8-alloy-subjected-to-complex-loading-configurations(a840bd28-102d-4c15-be6c-b4e72631e875).html.

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Анотація:
Friction stir welding (FSW) and aluminium alloy 2139-T8 are currently being considered for use in future military vehicles. However, stringent regulations on weld integrity under extreme loading conditions limit the adoption of new technologies. Moreover, current finite element (FE) based methods do not give reliable predictions of strain distribution in welds, which makes it difficult to assess the performance of structures. Therefore, an extensive research program was carried out to develop a generalised finite element (FE) based methodology to predict the response of welded structures under
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16

Haghjoo, Farhad. "The synthesis and structural characterisation of a series of iodides and dipyridyl ketone based metal complexes with relevance to the Grätzel photovoltaic cell and single molecule magnets." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/the-synthesis-and-structural-characterisation-of-a-series-of-iodides-and-dipyridyl-ketone-based-metal-complexes-with-relevance-to-the-gratzel-photovoltaic-cell-and-single-molecule-magnets(18f7cd83-fa41-46b9-a5c8-a28e95a9b184).html.

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Анотація:
The Grätzel photovoltaic cell is described in the introductory chapter and the main experimental method used in this study, X-ray crystallography, in the second chapter. The work described in chapter 3 and 4 was inspired by the Grätzel cell namely, the synthesis and characterisation of iodide and poly-iodides in chapter 3 and transition metal complexes synthesised using 2,2’-dipyridyl ketone in chapter 4.Chapter five looks in detail at a series of tri-angular lanthanide complexes, a chance discovery made while synthesising the 2,2’-dipyridyl ketone complexes described in chapter 4. These tri-a
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