Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Cat Cay refers to two islands in the Bahamas, North Cat Cay and South Cat Cay which is uninhabited. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. This image shows yachts and sail boats docked at the North Cat Cay marina. One of the yachts is flying a United States of America flag while another is called “Elsa B.” Two men, one dressed in a khaki uniform, stand on the dock. Three men can be seen in the boat closest to the camera. Slide labeled Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:6
http://ufdc.ufl.edu/AA00028368/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
View of young and older palm trees on a beach on North Cat Cay. Cat Cay refers to two islands in the Bahamas, North Cat Cay and South Cat Cay which is uninhabited. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. In the distance is the stone Gun Cay lighthouse, which was built in 1836. The light house’s top half is painted red and the lower half is painted white. Slide labeled Bryant Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:8
http://ufdc.ufl.edu/AA00028370/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
This image shows a view from a boat of some North Cat Cay houses. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. In the distance is the stone Gun Cay lighthouse, which was built in 1836. The light house’s top half is painted red and the lower half is painted white. In the foreground of the image is the front end of a boat flying a triangular shaped black and white flag with a red star. Slide labeled Bryant Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:13
http://ufdc.ufl.edu/AA00028375/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Two men are standing in a row boat near a red and blue seaplane floating off the coast of North Cat Cay. Slide labeled Bryant Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:12
http://ufdc.ufl.edu/AA00028374/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Walter W. S. Cook (wearing shorts) walks with another companion towards the marina on North Cat Cay, Bimini, Bahamas. Cook, who was the founding director of the Institute of Fine Arts at New York University, served as an art professor from 1932 to 1953, and was historian of Medieval Spanish art. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. In the image, the area near the walkway is planted with palm trees. Various types of boats and yachts are docked in the marina. Slide labeled Bryant Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:11
http://ufdc.ufl.edu/AA00028373/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Cat Cay refers to two islands in the Bahamas, North Cat Cay and South Cat Cay which is uninhabited. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. This image shows a picture of the beach with two small structures: a white cylindrical building with a pyramid shaped roof and the view of the roof of another structure in the distance. Tall grasses and palm trees are growing on the shoreline. This image was featured in William Junior Bryant’s book “Flames of Life: A Pictorial Philosophy,” first published in 1961. Slide labeled Bryant Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:9
http://ufdc.ufl.edu/AA00028371/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Walter W. S. Cook (wearing shorts) walks with another companion on North Cat Cay, Bimini, Bahamas. Cook, who was the founding director of the Institute of Fine Arts at New York University, served as an art professor from 1932 to 1953, and was historian of Medieval Spanish art. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. The walking path is lined with palm trees. In the distance is a view of the ocean and a tall, narrow stone building with windows, an arched doorway, and a pyramid shaped roof. Slide labeled Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:10
http://ufdc.ufl.edu/AA00028372/00001

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Cat Cay refers to two islands in the Bahamas, North Cat Cay and South Cat Cay which is uninhabited. North Cat Cay was purchased in 1931 by Louis Wasey as a private island and is presently (2013) owned by members of the Cat Cay Yacht Club. After converting the island to a private club, Wasey built a nine-hole golf course now known as Windsor Downs. The course occupies the center of the island and is named for the Duke of Windsor, who was the Governor of the Bahamas during World War II. The golf course, pictured, features sand traps, a lake, grassy fields, and is planted with many palm trees. Slide labeled Cat Cay, Mar '46.
Bahamas -- North America -- North Cat Cay, Bimini

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 3:7
http://ufdc.ufl.edu/AA00028369/00001

Éditeur(s) : Apud Frid. Fleischer in comm
Extrait de : Flora brasiliensis. Volumen I. Pars I (après l'index de la deuxième partie)
Résumé : Monts aurifères de Cata-Branca, dans la province de Minas Gerais
Tab. physiognom IL.
Siècle(s) traité(s) : 19
Permalien : http://www.manioc.org/images/TLS17055-0327i1
TLS17055-0327i1

Extrait de : Manuel de la navigation dans la mer des Antilles et dans le golfe de Mexique : vues de cotes (Pl. 48)
Résumé : Baie de la côte Blanche. Ile du Cat restant à l'O. (Côte du Mississipi). Ile du Ship restant à l'E. (Côte du Mississipi).

Droits : Domaine public
Permalien : http://www.manioc.org/images/SCH131460110i1
SCH131460110i1

Éditeur(s) : HAL CCSD Public Library of Science
Résumé : International audience
DNase I requires Ca²+ and Mg²+ for hydrolyzing double-stranded DNA. However, the number and the location of DNase I ion-binding sites remain unclear, as well as the role of these counter-ions. Using molecular dynamics simulations, we show that bovine pancreatic (bp) DNase I contains four ion-binding pockets. Two of them strongly bind Ca²+ while the other two sites coordinate Mg²+. These theoretical results are strongly supported by revisiting crystallographic structures that contain bpDNase I. One Ca²+ stabilizes the functional DNase I structure. The presence of Mg²+ in close vicinity to the catalytic pocket of bpDNase I reinforces the idea of a cation-assisted hydrolytic mechanism. Importantly, Poisson-Boltzmann-type electrostatic potential calculations demonstrate that the divalent cations collectively control the electrostatic fit between bpDNase I and DNA. These results improve our understanding of the essential role of cations in the biological function of bpDNase I. The high degree of conservation of the amino acids involved in the identified cation-binding sites across DNase I and DNase I-like proteins from various species suggests that our findings generally apply to all DNase I-DNA interactions.
ISSN: 1553-734X

hal-00645165
https://hal.archives-ouvertes.fr/hal-00645165
https://hal.archives-ouvertes.fr/hal-00645165/document
https://hal.archives-ouvertes.fr/hal-00645165/file/journal.pcbi.1001000.pdf
DOI : 10.1371/journal.pcbi.1001000

Éditeur(s) : HAL CCSD Public Library of Science
Résumé : International audience
Ro 31-8220 is a potent protein kinase C (PKC) inhibitor belonging to the chemical class of bisindolylmaleimides (BIMs). Various PKC-independent effects of Ro 31-8220 have however been demonstrated, including inhibition of the ATP-binding cassette drug transporter breast cancer resistance protein. In the present study, we reported that the BIM also blocks activity of the solute carrier organic cation transporter (OCT) 1, involved in uptake of marketed drugs in the liver, in a PKC-independent manner. Ro 31-8220, in contrast to other pan-PKC inhibitors such as staurosporine and chelerythrine, was thus shown to cis-inhibit uptake of the reference OCT1 substrate tetraethylammonium in OCT1-transfected HEK293 cells in a concentration-dependent manner (IC50 = 0.18 μM) and without altering membrane expression of OCT1. This blockage of OCT1 was also observed in human hepatic HepaRG cells that constitutionally express OCT1. It likely occurred through a mixed mechanism of inhibition. Ro 31-8220 additionally trans-inhibited TEA uptake in OCT1-transfected HEK293 cells, which likely discards a transport of Ro 31-8220 by OCT1. Besides Ro 31-8220, 7 additional BIMs, including the PKC inhibitor LY 333531, inhibited OCT1 activity, whereas 4 other BIMs were without effect. In silico analysis of structure-activity relationships next revealed that various molecular descriptors, especially 3D-WHIM descriptors related to total size, correspond to key physico-chemical parameters for inhibition of OCT1 activity by BIMs. In addition to activity of OCT1, Ro 31-8220 inhibited those of other organic cation transporters such as multidrug and toxin extrusion protein (MATE) 1 and MATE2-K, whereas, by contrast, it stimulated that of OCT2. Taken together, these data extend the nature of cellular off-targets of the BIM Ro 31-8220 to OCT1 and other organic cation transporters, which has likely to be kept in mind when using Ro 31-8220 and other BIMs as PKC inhibitors in experimental or clinical studies
ISSN: 1932-6203

hal-01255837
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01255837
DOI : 10.1371/journal.pone.0144667
PUBMED : 26657401
PUBMEDCENTRAL : PMC4675551

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
Berkeley F. Jones stands on the steps of the “Percy Cates and Sons” general store in Rock Sound, Eleuthera, Bahamas. The sign shows that the store sells dry goods and shoes. This image was taken during Jones’ fishing trip with William Junior Bryant to the Bahamas in 1948. Slide labeled BFJ Rock Sound '48.
Bahamas -- North America -- Rock Sound, Eleuthera

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 4:7
http://ufdc.ufl.edu/AA00028405/00001

Résumé : (Bibliography) Includes bibliographical references.
(Citation/Reference) Brown, J.C. Cat., 1493-1800,
(Citation/Reference) Sabin,
(Citation/Reference) Martin & Walter,
(Citation/Reference) Bissainthe, M. Dictionnaire de bib. haitienne,
Statement of responsibility for v. 2-4: Par J.Ph. Garran, député par le département du Loiret. Imprimé par ordre de la Convention nationale. Tome II, distribué au Corps législatif en pluviôse an VI.; ... Tome III, [-IV,] distribué au Corps législatif en nivose an VII.
Dates of publication: v.2: An VI de la République [1798]; v.3: An VII de la République [1799].
Text divided into three sections: Première partie. Des troubles parmi les blancs durant l'Assemblée constituante, et de la première assemblée coloniale (v.1); Seconde partie. Des insurrections contre les blancs, et de la seconde assemblée coloniale (v.2); Troisième partie. De l'administration de Polverel et de Sonthonax, et de l'affranchisement général des noirs (v.3-4).
(Statement of Responsibility) fait au nom de la Commission des colonies, des Comités de salut publique, de législation et de marine, réunis, par J. Ph. Garran, député par le département du Loiret. Imprimé par ordre de la Convention nationale, et distribué au Corps législatif en ...
Haiti
Haïti

Droits : This item is presumed to be in the public domain. The University of Florida George A. Smathers Libraries respect the intellectual property rights of others and do not claim any copyright interest in this item. Users of this work have responsibility for determining copyright status prior to reusing, publishing or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions may require permission of the copyright holder. The Smathers Libraries would like to learn more about this item and invite individuals or organizations to contact Digital Services (UFDC@uflib.ufl.edu) with any additional information they can provide.
870249362
ocn870249362
http://ufdc.ufl.edu/AA00021851/00001

Éditeur(s) : Impensis Levini Hulsii Impensis Levini Hulsii ( Noribergae (Nuremberg) )
Résumé : (Citation/Reference) Church, E.D. Discovery,
(Citation/Reference) Lenox,
(Citation/Reference) Sabin
(Citation/Reference) LC (Raleigh)
(Citation/Reference) BN (Raleigh)
(Citation/Reference) J.C. Brown cat.
Colophon: Noribergae, excudebat Christophorus Lochner, 1599.
Translation of part five of Hulsius' Collection of voyages and travels, (Kurtze wunderbare Beschreibung dess Goldreichen Königreichs Guianae in America).
Page 2 incorrectly numbered 6.
Latin edition of part V of the Hulsius Voyages. Probably printed after Hulsius' 1599 German edition of part V. Only pts. IV and V of the collection were translated into Latin--Cf. Lenox Library, Contributions to a catalogue, no. 1, p. 8; also Church, E.D.A catalogue of books relating to the discovery ... of North and South America, v. 2, p. 662.
An abridgment of Sir Walter Raleigh's the discoverie of the large, rich, and bevvtiful empire of Guiana, originally published London, Robert Robinson, 1596--Cf. Church, v. 2, p. 651; also Tiele, P.A., Mémoire bibliographique sur les journaux des navigateurs néerlandais, p. 307.
The map and plates are the same as those in the German version. Map has title "Nova et exacta delineatio Americae partis avstralis. ... Noribergae, per Leuinum Hulsium. Anno 1599."
Another Latin translation was included in the 8th part of De Bry's "Great voyages," in 1599.
(Statement of Responsibility) per generosum dominum, Dn. Gvalthervm Ralegh eqvitem anglum detectum est: paulò post jussu ejusduobus libellis comprehensa: ex quibus Iodocvs Hondivs tabvlam geographicam adornavit, addita explicatione belgico sermone scripta: nunc verò in latinum sermonem translata, & ex variis authoribus hinc inde declarata.
Guiana
America
South America
West Indies

84408216

Éditeur(s) : HAL CCSD Wiley-Blackwell Wiley
Résumé : International audience
Rhodamine 123 is a fluorescent cationic dye commonly used as a mitochondrial probe and known or suspected to be transported by certain drug membrane transporters. The present study was designed to characterize the putative interactions of rhodamine 123 with human organic cation transporter (OCT) 1 and OCT2. Intracellular uptake of the dye was demonstrated to be enhanced in both hOCT1- and hOCT2-overexpressing HEK293 cells when compared with control HEK293 cells. This increase of rhodamine 123 influxes was found to be a saturable carrier-mediated process, with low K(m) values (K(m) = 0.54 μm and K(m ) = 0.61 μm for transport of the dye in hOCT1- and hOCT2-positive HEK293 cells, respectively). Known inhibitors of hOCT1 and hOCT2 activities such as verapamil, amitriptyline, prazosin, and quinine were next demonstrated to decrease rhodamine 123 accumulation in hOCT1- and hOCT2-overexpressing HEK293 cells. In addition, the dye was found to inhibit hOCT1- and hOCT2-mediated uptake of tetraethylammonium (TEA), a model substrate for both hOCT1 and hOCT2; rhodamine 123 appeared nevertheless to be a more potent inhibitor of hOCT1-mediated TEA transport (IC(50) = 0.37 μm) than of that mediated by hOCT2 (IC(50 ) = 61.5 μm). Taken together, these data demonstrate that rhodamine 123 is a high-affinity substrate for both hOCT1 and hOCT2. This dye may be therefore useful for fluorimetrically investigating cellular hOCT1 or hOCT2 activity, knowing, however, that other factors potentially contributing to cellular accumulation of rhodamine 123, including mitochondrial membrane potential or expression of the efflux transporter P-glycoprotein, have also to be considered.
ISSN: 0767-3981

inserm-00872840
http://www.hal.inserm.fr/inserm-00872840
DOI : 10.1111/j.1472-8206.2012.01071.x
PUBMED : 22913740

Éditeur(s) : HAL CCSD Ecological Society of America
Résumé : Although niche-based and stochastic processes, including dispersal limitation and demographic stochasticity, can each contribute to community assembly, it is difficult to quantify the relative importance of each process in natural vegetation. Here, we extend Shipley's maxent model (Community Assembly by Trait Selection, CATS) for the prediction of relative abundances to incorporate both trait-based filtering and dispersal limitation from the larger landscape and develop a statistical decomposition of the proportions of the total information content of relative abundances in local communities that are attributable to trait-based filtering, dispersal limitation, and demographic stochasticity. We apply the method to tree communities in a mature, species-rich, tropical forest in French Guiana at 1-, 0.25- and 0.04-ha scales. Trait data consisted of species' means of 17 functional traits measured over both the entire meta-community and separately in each of nine 1-ha plots. Trait means calculated separately for each site always gave better predictions. There was clear evidence of trait-based filtering at all spatial scales. Trait-based filtering was the most important process at the 1-ha scale (34%), whereas demographic stochasticity was the most important at smaller scales (37-53%). Dispersal limitation from the meta-community was less important and approximately constant across scales (similar to 9%), and there was also an unresolved association between site-specific traits and meta-community relative abundances. Our method allows one to quantify the relative importance of local niche-based and meta-community processes and demographic stochasticity during community assembly across spatial and temporal scales.
ISSN: 0012-9658

hal-01032424
https://hal.archives-ouvertes.fr/hal-01032424

Éditeur(s) : HAL CCSD Oxford University Press (OUP)
Résumé : International audience
The diffusion of titanium along with Ni, Co and Mn in pure synthetic forsterite has been studied as a function of temperature, oxygen fugacity, crystallographic orientation and chemical potentials in the four-component system MgO–SiO2–TiO2–TiO1·5. In over 100 different experimental conditions, no Ti diffusion profiles with the classical shape of the error function were observed. Instead, the profiles vary between ‘stepped’ at high fO2 (probably owing to diffusion on octahedral sites and trapping in tetrahedral sites), to hockey-stick shapes at low fO2 owing to concentration-dependent diffusion. The profile shapes vary systematically between these end-members according to oxygen fugacity. These profile shapes are also reproduced in experiments using natural San Carlos olivine. The change in profile shape is interpreted to be a function of valence-state change from Ti4+ to Ti3+, shown by a sigmoidal log fO2–diffusivity relationship. To distinguish between Ti4+ and Ti3+ in forsterite, a diffusion profile was also investigated using ‘hydroxylation spectroscopy’ whereby a crystal from a diffusion experiment was hydroxylated by annealing in an H2O-rich fluid at moderate pressure and temperature. The point defects associated with the added structural OH were then determined by infrared spectroscopy, providing evidence for the presence of Ti4+ and Ti3+ at intermediate oxygen fugacity. The transition from Ti4+ to Ti3+ occurs at considerably higher fO2 in these diffusion experiments than in equilibrium experiments in similar systems. Titanium diffusion, qualified using a mobility parameter (M), is fastest along the c-axis, at high activity of silica, low oxygen fugacity and high temperature. The rate of Ti diffusion is broadly similar to those of Mn, Ni and Co, and closer to published rates of Mg self-diffusion in olivine than Si self-diffusion. The observed Ti3+ and Ti4+ diffusion occurs on the M-sites. From statistical examination of the large Mn, Ni and Co diffusivity dataset, we determine that there is a 102/3 dependence of diffusion on aSiO2; the cations diffuse more rapidly at high aSiO2. In addition, diffusivity has a 10–1/8 dependence on fO2, suggested to be the result of increased concentration of loosely bound Ti3+–vacancy pairs, which enhance the mobility of other cations. This behaviour is likely to be present in natural systems where trivalent (e.g. Fe3+, Al3+, Cr3+) and divalent cations diffuse together. Consideration should be given to diffusive interference by highly charged, fast-moving cations when extracting time scales from frozen diffusion profiles.
ISSN: 0022-3530

hal-01531344
https://hal.archives-ouvertes.fr/hal-01531344
DOI : 10.1093/petrology/egw067

Éditeur(s) : HAL CCSD Springer Verlag
Résumé : International audience
Polarized emittance measurements were acquired for synthetic forsterite, the pure magnesium end member of the olivines group, on the whole infrared spectral range and up to the melting point by using CO2 laser heating. The experimental data, fitted with a semi-quantum dielectric function model, allowed the retrieval of the temperature dependence of the absorption coefficient of forsterite both in the opaque and semi-transparent regions. The analysis of the phonon parameters indicates that the lattice dynamics evolve drastically with increasing temperature. The normal modes involving motions of the magnesium cations located in site 1 are the more impacted, and some of them vanish around 1,200 K. The results confirm that the enhancement of the lattice anharmonicity and the increasing mobility of the magnesium cations are closely linked and are at the origin of the anomalies observed in the evolution of the thermophysical properties. This complete set of spectroscopic data may be a step toward a more precise evaluation of the impact of thermal radiation heat transfer inside systems involving forsterite and quantification of their heat budget.
ISSN: 0342-1791

hal-00817079
https://hal.archives-ouvertes.fr/hal-00817079
DOI : 10.1007/s00269-013-0570-z

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Predicting the impact of underground engineering on the environment requires the knowledge of natural media at different scales. In particular, understanding basic phenomena controlling the properties of rocks in the presence of complex fluids necessitates a detailed atomic description of the solid/fluid/solid contacts, the subject of Part I of the present study. First, building the solid interspace between two different crystals in a non-periodic situation is achieved using the ab initio and molecular mechanics code GenMol (TM). A description of the fluid confined within the interspace is then derived from the original genetic iterative multi-species (GIMS) algorithm implemented in the same code. This approach consists of equilibrating chemical potentials, cycle after cycle and species after species, between the confined fluid and the free natural fluid. An elementary iteration for a species k consists of different steps incrementing the number N-k of particles k, with other numbers N-k remaining constant. At each step, an optimum fluid composition is obtained by a genetic process distributing the fluid particles on a grid by stochastic shots, followed in fine by a refining process. The effectiveness of the GIMS approach is demonstrated in the case study of a fluid confined between two (0 0 1) kaolinite faces, with apertures h varying between 4 and 10 A. connected to a 9-species external solution [H2O, Cl-, Na+ CO2(aq), NaCl(aq), Ca2+, Mg2+, HCO3-, H3O+] where concentrations are ranging from 55 to 10(-4) mol/L. The results show a drastic variation in the solute/solvent and cations/ions ratios in the confined fluid when aperture h is lowered to less than 1 nm. These results obtained with a very rapid convergence of the iterative algorithm combined with a very competitive genetic optimizer are validated with high precision on a free solution. This description of contacts between crystals is original and unattainable by standard crystal interface approaches. It opens the way to understanding and/or predicting phenomena between crystals in a complex natural environment, such as adhesion or repulsion investigated in the Part II of this study.
ISSN: 0022-0248

hal-00544569
https://hal.archives-ouvertes.fr/hal-00544569
DOI : 10.1016/j.jcrysgro.2010.08.009