Log in

Relevant bibliographies by topics / Cycle du carbonate de calcium (CaCO3) / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Cycle du carbonate de calcium (CaCO3).

Dissertations / Theses on the topic 'Cycle du carbonate de calcium (CaCO3)'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 29 dissertations / theses for your research on the topic 'Cycle du carbonate de calcium (CaCO3).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Planchat, Alban. "Alkalinity and calcium carbonate in Earth system models, and implications for the ocean carbon cycle." Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLE005.

Full text

Abstract:

L’alcalinité de l’océan (Alk) est essentielle dans l’absorption de carbone atmosphérique et offre une capacité tampon contre l’acidification. Dans le cadre des prévisions de l’absorption de carbone par les océans et des impacts potentiels sur les écosystèmes, la représentation de l’Alk et du principal facteur de sa distribution dans l’océan profond, le cycle du carbonate de calcium (CaCO3), ont souvent été négligés. Cette thèse aborde le manque de considération accordé à l’Alk et au cycle du CaCO3 dans les modèles du système terrestre (ESM) et explore les implications pour le cycle du carbone

APA, Harvard, Vancouver, ISO, and other styles

2

au, vicky whiffin@sydneywater com, and Victoria S. Whiffin. "Microbial CaCO3 precipitation for the production of biocement." Murdoch University, 2004. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20041101.142604.

Full text

Abstract:

The hydrolysis of urea by the widely distributed enzyme urease is special in that it is one of the few biologically occurring reactions that can generate carbonate ions without an associated production of protons. When this hydrolysis occurs in a calcium-rich environment, calcite (calcium carbonate) precipitates from solution forming a solid-crystalline material. The binding strength of the precipitated crystals is highly dependent on the rate of carbonate formation and under suitable conditions it is possible to control the reaction to generate hard binding calcite cement (or Biocement). The

APA, Harvard, Vancouver, ISO, and other styles

3

Derrien, Anne-Cécile. "Synthèse et caractérisation physico-chimique de géopolymères. Application cinétique de minéralisation de géopolymères et du biomatériau CaCO3 synthétique." Rennes 1, 2004. https://tel.archives-ouvertes.fr/tel-00007911.

Full text

Abstract:

Les chirurgiens sont confrontés à des pertes de substance osseuse qui impliquent l'utilisation de biomatériaux synthétiques de comblement. Leur utilisation permet de limiter les réponses immunitaires et leur disponibilité est quasi illimitée. Notre travail a porté sur des géopolymères (Si/Al=21). Ces aluminosilicates synthétisés ont été associés à des phosphates de calcium. Chauffés à 500ʿC, les géopolymères présentent des pH de 7 et un bon compromis propriétés mécaniques/ porosité. Ces matériaux ont été étudiés in vitro et in vivo pour évaluer leur potentiel pour une utilisation comme biomaté

APA, Harvard, Vancouver, ISO, and other styles

4

Marquina, Edgar Alberto. "Use of Dynamic Mechanical Testing, WAXD and SEM Image Analysis to Study the Properties of Polypropylene/Calcium Carbonate Nanocomposites." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1269363578.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Ouhenia, Salim. "Simulation des diagrammes de diffraction par la méthode combinée : application aux systèmes CaCO3." Caen, 2008. http://www.theses.fr/2008CAEN2080.

Full text

Abstract:

Le développement considérable réalisé ces dix dernières années dans les techniques de diffraction sur des échantillons sous forme de poudre même très texturés (temps d’enregistrement raisonnable et très bonne résolution) et les progrès fascinants des moyens de calcul sur des machines individuelles rendent possible l’accès à des informations précises et avec des temps de calcul raisonnablement courts. Dans ce travail, nous avons appliqué l’analyse combinée basée sur la méthode de Rietveld pour étudier des échantillons de carbonates de calcium naturels de coquilles de certaines espèces de mollus

APA, Harvard, Vancouver, ISO, and other styles

6

Ramos, Ana Paula. "Modificação de superfícies metálicas por meio da deposição de filmes finos orgânicos LB/LbL e filmes híbridos contendo CaCO3." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-11092009-114534/.

Full text

Abstract:

Muitos organismos vivos, tal como seus constituintes, são formados por sistemas químicos complexos que envolvem a interação entre compostos orgânicos e inorgânicos ligados química e/ou fisicamente. Nestes sistemas as matrizes orgânicas são geralmente compostas por macromoléculas como polissacarídeos e proteínas. Essas moléculas têm o papel de direcionar a nucleação e o crescimento da porção inorgânica. O uso de superfícies metálicas adequadas recobertas por este tipo de filme híbrido tem potencial aplicação em implantes de substituição óssea, no qual são requeridas superfícies quimicamente ine

APA, Harvard, Vancouver, ISO, and other styles

7

Tu, Zhenghuan. "Filtration dynamique de suspensions de CaCO3 et de solutions de surfactants." Compiègne, 2009. http://www.theses.fr/2009COMP1810.

Full text

Abstract:

Ce mémoire décrit des essais de la micro et l'ultrafiltration dynamique effectués avec trois pilotes de laboratoire, un pilote MSD à disque membranaire rotatif sur deux arbres, un pilote à disque rotatif avec une membrane organique fixe, et un pilote à cylindre tournant avec une membrane concentrique. Le module MSD a été testé en microfiltration de suspensions de CaCO3 où nous avons comparé des membranes céramiques et organiques. Les essais ont confirmé l'importance du recouvrement des disques. Ensuite, nous avons appliqué le système de MSD aux traitements des effluents modèles de surfactants

APA, Harvard, Vancouver, ISO, and other styles

8

Vieira, Juliana Aparecida. "Biodeposição de CaCO3 em materiais cimentícios : contribuição ao estudo da biomineralização induzida por Bacillus subtilis." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/170983.

Full text

Abstract:

A indústria da construção civil é conhecida como umas das atividades econômicas que causam os maiores impactos ambientais desde o processo de extração da matéria prima até a produção dos produtos, incluindo o transporte e manutenção do ambiente construído. A produção de um dos seus principais componentes, o cimento, é o maior contribuinte para a emissão de gases de efeito estufa, principalmente devido a queima de combustíveis fósseis. Por este motivo, pesquisas na área de biotecnologia sustentável são conduzidas para diminuir e até mitigar os efeitos danosos provocados pelos fatores que compõe

APA, Harvard, Vancouver, ISO, and other styles

9

Matahwa, Howard. "Chemical modification of polysaccharides with hydrophilic polymers for CaCO3 crystal growth modification and filler retention, for paper applications." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1396.

Full text

Abstract:

Thesis (PhD (Chemistry and Polymer Science))--Stellenbosch University, 2008.<br>Polysaccharides were modified with selected polymers via the grafting technique. Both anionic and cationic polysaccharides were prepared. Random and crosslinked graft copolymers were also prepared. The percentage grafting was determined by gravimetric analysis and results were confirmed by cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance microscopy (CP/MAS 13C NMR). These modified biodegradable polymers were then used to flocculate precipitated calcium carbonate (PCC). The effects o

APA, Harvard, Vancouver, ISO, and other styles

10

Görgen, Sigrid. "Les mécanismes moléculaires de la biominéralisation intracellulaire de CaCO3 chez les cyanobactéries." Electronic Thesis or Diss., Sorbonne université, 2020. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2020SORUS158.pdf.

Full text

Abstract:

La biominéralisation des carbonates de calcium est un processus répandu chez les bactéries. Cependant les mécanismes moléculaires sous-jacents restent mal compris. Récemment, la biominéralisation intracellulaire de phases amorphes de carbonate de calcium (iACC) a été découverte chez des cyanobactéries répandues environnementalement et phylogénétiquement. Un gène orphelin de fonction inconnue, nommé ccyA et codant pour une protéine nommée Calcyanine, a été identifié uniquement chez ces cyanobactéries. Ainsi mon travail de thèse a consisté à développer une approche génétique pour analyser la fon

APA, Harvard, Vancouver, ISO, and other styles

11

Ouhenia, Salim, and Daniel Chateigner. "Simulation des diagrammes de diffraction par la méthodecombinée : application aux systèmes CaCO3." Phd thesis, Université de Caen, 2008. http://tel.archives-ouvertes.fr/tel-00360209.

Full text

Abstract:

Le développement considérable réalisé ces dix dernières années dans les techniques de<br />diffraction sur des échantillons sous forme de poudre même très texturés (temps<br />d'enregistrement raisonnable et très bonne résolution) et les progrès fascinants des moyens de<br />calcul sur des machines individuelles rendent possible l'accès à des informations précises et<br />avec des temps de calcul raisonnablement courts. Dans ce travail, nous avons appliqué<br />l'analyse combinée basée sur la méthode de Rietveld pour étudier des échantillons de<br />carbonates de calcium naturels de coquilles

APA, Harvard, Vancouver, ISO, and other styles

12

Mansoori, Hamed. "Influence of Calcium and Magnesium Ions and their Carbonate Scales on CO2 Corrosion of Mild Steel." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1578414196892282.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Sahnoune, Farid. "Relations structure - propriétés mécaniques dans des systèmes PEHD/PS et PEHD/CaCO3 modifiés par des agents élastomères : application au recyclage des matières plastiques." Montpellier 2, 1998. http://www.theses.fr/1998MON20092.

Full text

Abstract:

L'objectif de l'etude est d'ameliorer la resistance au choc et la rigidite d'un melange polyethylene/polystyrene. Nous avons envisage d'ameliorer la rigidite par l'incorporation d'une charge minerale (carbonate de calcium). Pour compenser l'effet fragilisant d'une telle charge, nous avons incorpore ensuite des copolymeres elastomeres susceptibles d'agir aux interfaces du systeme et ameliorer ainsi la resistance au choc. Le materiau final etant complexe, nous avons decompose l'etude pour mieux comprendre les effets apportes par chaque constituant. Nous avons d'abord etudie les comportements des

APA, Harvard, Vancouver, ISO, and other styles

14

Davenport, Jesse. "Isotopic tracing of silicate and carbonate weathering in the Himalayan erosional system." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0241.

Full text

Abstract:

L'altération des lithologies himalayennes a potentiellement impacté le cycle global du carbone. Pour pouvoir contraindre et comprendre les processus qui se sont produits dans l'Himalaya et qui ont affecté ces cycles, nous devons être distinguer les signatures de l'altération du silicate et du carbonate dans la charge dissoute des fleuves de l'Himalaya. Des études antérieures ont tenté de le faire en utilisant diverses méthodes mais il n’existe toujours pas de consensus clair sur l’ampleur et le flux de l’altération du silicate dans l’Himalaya. Cette thèse propose l'utilisation du 40Ca comme tr

APA, Harvard, Vancouver, ISO, and other styles

15

Felix, JoÃo Ermeson Mota. "SÃntese de sÃlica mesoporosa de grande Ãrea superficial para o tratamento de efluentes e sua aÃÃo conjunta com CaCO3 e o extrato aquoso da folha da bananeira contendo taninos." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9822.

Full text

Abstract:

Este trabalho consiste na sÃntese de sÃlica mesoporosa de grande Ãrea superficial e seu uso para fins de tratamento de efluentes na remoÃÃo de metais tÃxicos e compostos orgÃnicos, alÃm do seu uso conjunto com CaCO3 e o extrato aquoso das folhas da planta Musa spp (Bananeira) que provavelmente contem taninos. Existem diversos trabalhos sobre a utilizaÃÃo de sÃlica mesoporosa, de taninos vegetais e do carbonato de cÃlcio, que possuem eficiÃncia na remoÃÃo de metais tÃxicos e de compostos orgÃnicos de corpos hÃdricos e efluentes. A sÃlica Ã um polÃmero inorgÃnico de formula mÃnima SiO2, onde mui

APA, Harvard, Vancouver, ISO, and other styles

16

Davenport, Jesse. "Isotopic tracing of silicate and carbonate weathering in the Himalayan erosional system." Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0241.

Full text

Abstract:

L'altération des lithologies himalayennes a potentiellement impacté le cycle global du carbone. Pour pouvoir contraindre et comprendre les processus qui se sont produits dans l'Himalaya et qui ont affecté ces cycles, nous devons être distinguer les signatures de l'altération du silicate et du carbonate dans la charge dissoute des fleuves de l'Himalaya. Des études antérieures ont tenté de le faire en utilisant diverses méthodes mais il n’existe toujours pas de consensus clair sur l’ampleur et le flux de l’altération du silicate dans l’Himalaya. Cette thèse propose l'utilisation du 40Ca comme tr

APA, Harvard, Vancouver, ISO, and other styles

17

Le, Vu Briac. "La biocalcification dans l'océan actuel à travers l'organisme modèle Emiliania huxleyi : quand la mer devient blanche." Paris 6, 2005. http://www.theses.fr/2005PA066523.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Walker, Jessica Mary. "Role of macromolecules in coccolithophore biomineralization." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31401.

Full text

Abstract:

Biomineralization refers to the production of mineralized tissues by organisms. The fine control which organisms can exert over this process produces crystals with morphologies and properties contrasting to that of non-biogenic crystals and specifically altered to suit the required functional need. A key model system of biomineralization are a unicellular marine algae, coccolithophores, which produce calcium carbonate scales known as coccoliths. These coccoliths are comprised of arrangements of single crystals of calcite interlocked to form a plate-shaped structure. Coccoliths are developed in

APA, Harvard, Vancouver, ISO, and other styles

19

Lemaitre, Nolwenn. "Approche multi-proxy (Thorium-234, Baryum en excès) des flux d'export et de reminéralisation du carbone et des éléments nutritifs associés à la pompe biologique océanique." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0009/document.

Full text

Abstract:

L’objectif principal de cette thèse est de mieux comprendre les différents facteurs contrôlant la pompe biologique de carbone en Atlantique Nord et dans l’Océan Austral, à proximité des îles Kerguelen, en utilisant notamment deux approches: le Thorium-234 (234Th) et le baryum biogénique (Baxs).En Atlantique Nord, les flux d’export de carbone organique particulaire (POC) augmentent lorsqu’ils sont associés à des minéraux biogéniques (silice biogénique et carbonate de calcium) et lithogènes, capable de lester les particules. L’efficacité d’export, généralement plus faible que précédemment suppos

APA, Harvard, Vancouver, ISO, and other styles

20

Alsadaie, Salih M. M. "Design and Operation of Multistage Flash (MSF) Desalination: Advanced Control Strategies and Impact of Fouling. Design operation and control of multistage flash desalination processes: dynamic modelling of fouling, effect of non-condensable gases on venting system design and implementation of GMC and fuzzy control." Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/15924.

Full text

Abstract:

The rapid increase in the demand on fresh water due the increase in the world population and scarcity of natural water puts more stress on the desalination industrial sector to install more desalination plants around the world. Among these desalination plants, multistage flash desalination process (MSF) is considered to be the most reliable technique of producing potable water from saline water. In recent years, however, the MSF process is confronting many problems to cut off the cost and increase its performance. Among these problems are the non-condensable gases (NCGs) and the accumulation o

APA, Harvard, Vancouver, ISO, and other styles

21

Rogers, Nicholas John. "The respiratory and gut physiology of fish : responses to environmental change." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/19295.

Full text

Abstract:

Many of the habitats occupied by fish are highly dynamic, naturally demonstrating substantial abiotic fluctuations over diurnal, tidal or seasonal cycles. It is also the case that throughout their 545 million year evolutionary history, fish have existed in aquatic environments very different to those of the present day. However, the past several decades have seen unprecedented rates of environmental change, at local and global scales, arising from human activities. The two major themes of the present thesis are: 1) Respiratory responses of fish to changes in environmental oxygen and temperatur

APA, Harvard, Vancouver, ISO, and other styles

22

"Models for Amorphous Calcium Carbonate." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.14508.

Full text

Abstract:

abstract: Many species e.g. sea urchin form amorphous calcium carbonate (ACC) precursor phases that subsequently transform into crystalline CaCO3. It is certainly possible that the biogenic ACC might have more than 10 wt% Mg and &sim; 3 wt% of water. The structure of ACC and the mechanisms by which it transforms to crystalline phase are still poorly understood. In this dissertation our goal is to determine an atomic structure model that is consistent with diffraction and IR measurements of ACC. For this purpose a calcite supercell with 24 formula units, containing 120 atoms, was constructed. V

APA, Harvard, Vancouver, ISO, and other styles

23

Makgae, Ofentse Alfred. "Morphogenesis of hierarchal CaCO3: a novel "soft" colloidal template for the fabrication of carbon materials." Thesis, 2016. http://hdl.handle.net/10539/21075.

Full text

Abstract:

A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Chemistry. University of the Witwatersrand, Johannesburg. May 2016<br>In this research project, the morphogenesis and polymorphism of calcium carbonate (CaCO3) and its subsequent use as a template in the fabrication of hollow carbon spheres (HCS) is reported. A series of ratios (i.e. 5:0, 5:1, 5:2, 5:3, 5:4, 5:5, and 0:5) of binary solvent mixtures consisting of polar aprotic (dimethylformamide and dimethyl sulfoxide) and p

APA, Harvard, Vancouver, ISO, and other styles

24

Oliveira, Susana Costa de. "Biomimetic mineralization: encapsulation in calcium carbonate shells." Master's thesis, 2015. http://hdl.handle.net/10362/16106.

Full text

Abstract:

Calcium carbonate biomineralization is a self-assembly process that has been studied to be applied in the biomedical field to encapsulate biomolecules. Advantages of engineering mineral capsules include improved drug loading efficiencies and protection against external environment. However, common production methods result in heterogeneous capsules and subject biomolecules to heat and vibration which cause irreversible damage. To overcome these issues, a microfluidic device was designed, manufactured and tested in terms of selectivity for water and oil to produce a W/O/W emulsion. During the

APA, Harvard, Vancouver, ISO, and other styles

25

Yacoby, Michael Joel. "The effect of magnetic and constant electric field antiscaling devices on the mechanism of CaCO3 scale formation." Thesis, 2014. http://hdl.handle.net/10210/9091.

Full text

Abstract:

D.Phil. (Chemistry)<br>The formation ofcalcium carbonate scale is a major problem in industry as well as in households. The scale that forms acts as an insulator, decreasing the effectiveness ofheat exchangers, be it a water cooling systems or a water heating system This raises the energy costs ofthat company and the costs of cleaning are expensive. Physical water treatment has been used for at least 50 years in the treatment ofwater with scale forming potential to reduce the formation ofthis scale. In thisthesis, tests were made on a magnetic and constantelectric field antiscaling device on t

APA, Harvard, Vancouver, ISO, and other styles

26

Chen, Hsingming Anna. "Auto Template Assembly of CaCO3-Chitosan Hybrid Nanoboxes and Nanoframes in Ionic Liquid Medium." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9252.

Full text

Abstract:

Recently, there has been increased effort in researching methods for producing hollow nanostructures because of their potential impact in the fields of catalysis, separation processes, drug delivery, and energy storage and conversion devices. The purpose of this thesis is to describe a method for forming hollow inorganic-organic hybrid nanoboxes and nanoframes. This approach relies upon ionic liquid (1-butyl-3-methyl-imidazolium chloride) mediated auto-templating assembly of CaCO3 and chitosan to form nanoframes (two open faces) and nanoboxes (one open face). The average dimension of the

APA, Harvard, Vancouver, ISO, and other styles

27

Zakir, Tasnuva. "Evaluation and Control of Pirssonite Scale Formation in Green Liquor Systems of the Kraft Process." Thesis, 2012. http://hdl.handle.net/1807/33786.

Full text

Abstract:

Scaling in green liquor handling systems is a persistent problem in many kraft mills. Scaling is commonly believed to be the result of pirssonite (Na2Ca(CO3)2∙2H2O) deposition. In this work, scale characterization was performed by analyzing 12 scale samples obtained from 10 kraft mills. Only 4 samples were identified as pirssonite while the remaining consisted of CaCO3. The predominant presence of CaCO3 in the scale samples was found to be the result of selective dissolution of Na2CO3 from pirssonite scale, leaving CaCO3 behind. Experimental studies were also conducted to study pirssonite solu

APA, Harvard, Vancouver, ISO, and other styles

28

Perala, Siva Rama Krishna. "Alternative Mechanisms for Size Control in Synthesis of Nanoparticles - Population Balance Modelling and Experimental Studies." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3361.

Full text

Abstract:

The extensive growth of nanotechnology has necessitated the development of economical and robust methods for large scale production of nanomaterials. It requires detailed quantitative understanding of lab-scale processes to enable effective scale-up and development of new contacting strategies for their controlled synthesis. In this thesis, attempts are made in both the directions using experimental and modelling approaches for synthesis of different nanoparticles. The two-phase Brust--Schiffrin protocol for the synthesis of gold nanoparticles was investigated first. The mechanism of transfer

APA, Harvard, Vancouver, ISO, and other styles

29

Perala, Siva Rama Krishna. "Alternative Mechanisms for Size Control in Synthesis of Nanoparticles - Population Balance Modelling and Experimental Studies." Thesis, 2013. http://etd.iisc.ernet.in/2005/3361.

Full text

Abstract:

The extensive growth of nanotechnology has necessitated the development of economical and robust methods for large scale production of nanomaterials. It requires detailed quantitative understanding of lab-scale processes to enable effective scale-up and development of new contacting strategies for their controlled synthesis. In this thesis, attempts are made in both the directions using experimental and modelling approaches for synthesis of different nanoparticles. The two-phase Brust--Schiffrin protocol for the synthesis of gold nanoparticles was investigated first. The mechanism of transfer

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!