Добірка наукової літератури з теми "Affinement de structure"
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Статті в журналах з теми "Affinement de structure"
van Meerssche Léonard, M. A., and P. J. Stoffyn. "Affinement de la Structure de SP(C2H5)3." Bulletin des Sociétés Chimiques Belges 68, no. 10-12 (September 1, 2010): 683–98. http://dx.doi.org/10.1002/bscb.19590681014.
Повний текст джерелаBourguiba, Noura Fakhar, and Leila Smiri Dogguy. "Preparation et affinement de la structure d'un silicate a double chaines d'yttrium et de trisodium." Materials Research Bulletin 29, no. 4 (April 1994): 427–36. http://dx.doi.org/10.1016/0025-5408(94)90075-2.
Повний текст джерелаBenazeth, S., Nguyen Huy Dung, M. Guittard та P. Laruelle. "Affinement sur monocristal de la structure du polytype 2H du séléniure de gallium GaSe forme β". Acta Crystallographica Section C Crystal Structure Communications 44, № 2 (15 лютого 1988): 234–36. http://dx.doi.org/10.1107/s0108270187010102.
Повний текст джерелаCarton, S., C. Lacour, R. Jouvent, and D. Widlöcher. "Le concept de recherche de sensations: traduction et validation de l'échelle de Zuckerman." Psychiatry and Psychobiology 5, no. 1 (1990): 39–48. http://dx.doi.org/10.1017/s0767399x00003369.
Повний текст джерелаToure, Abdoulaye Abba, Gabrielle Kra, Rose Eholie, Josette Olivier-Fourcade, and Jean-Claude Jumas. "Mise au point sur le système binaire TlTe et affinement des structures de TlTe et Tl5Te3." Journal of Solid State Chemistry 87, no. 1 (July 1990): 229–36. http://dx.doi.org/10.1016/0022-4596(90)90087-e.
Повний текст джерелаBaudour, J. L., L. Toupet, Y. Délugeard, and S. Ghémid. "Transitions de phase structurales dans les polyphényles. IX. Affinements des structures du p-terphényle hydrogéné à 200 K (diffraction des rayons X) et du biphényle deutéré à 40 K (diffraction des neutrons)." Acta Crystallographica Section C Crystal Structure Communications 42, no. 9 (September 15, 1986): 1211–17. http://dx.doi.org/10.1107/s0108270186092843.
Повний текст джерелаДисертації з теми "Affinement de structure"
Broutin, Isabelle. "Affinement de la structure de la collagenase d'hypoderma lineatum a 1,8 a de resolution." Paris 11, 1993. http://www.theses.fr/1993PA112318.
Повний текст джерелаNgassa, Tankeu Yvan Georges. "Affinement de structure par PEDT (Precession Electron Diffraction Tomography) dans des échantillons d’intérêt minéralogique." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R079.
Повний текст джерелаSince a few years, Precession Electron Diffraction Tomography (PEDT) coupled to dynamical calculations of diffracted intensities has been used to allow the structure solving and refinement at the nanoscale in a Transmission Electron Microscope (TEM). The method is here applied to the structure refinement of ferromagnesian spinels and orthopyroxenes for their use as geothermometers. The aim is to test the sensitivity of the method for the measurement of the occupancy rate, depending on temperature, of iron and magnesium cations on specific crystallographic sites of the structure. Studied samples are either synthetic (magnesioferrite (MgFe2)O4 and hercynite (FeAl2)O4) or natural (orthopyroxene (Mg1.4Fe0.6)Si2O6). The sensitivity of the method is tested as a function of various parameters such as the sample-thinning technique used for TEM observations, the sample chemical composition, the refinement methodology and parameters. In the case of our spinels, it is shown that samples as obtained by Focused Ion Beam (FIB) are not appropriated, contrary to samples as obtained by simple mechanical grinding. Structure refinements have then been successfully conducted, provided the chemical composition of the sample is fixed during the procedure. The final accuracy is then far sufficient to use the refinement results for geosciences applications. Concerning pyroxenes, FIB samples are suitable for the study. Refinement results are nevertheless more accurate once the chemical composition is imposed during the procedure
Latrach, Abdelkhalek. "Affinement structural par ajustement du profil total obtenu par diffraction X ou neutronique sur poudres." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598978d.
Повний текст джерелаDumas, Philippe. "Affinement cristallographique et etude structurale de l'acide ribonucleique de transfert de levure specifique de l'acide aspartique." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13182.
Повний текст джерелаPerca, Cristian. "Structure cristalline et magnétique de perovskites RBaMn2O6-d (où d=0 et 0.5)." Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00076575.
Повний текст джерелаEn ce qui concerne le composé YBaMn2O6, les mesures par DSC indiquent que celui-ci subit trois transitions : deux autour de 500K et la troisième à 750K. L'étude par diffraction des rayons X et de neutrons a montré que la phase de plus haute température cristallisait dans le groupe P4/nbm. Les diffractogrammes de rayons X et de neutrons ne présentent qu'un seul changement alors que deux transitions sont observées par DSC au voisinage de 500K. La phase intermédiaire a été affinée dans le groupe d'espace C2/m. La phase d'ordre de charges (en dessous de 500K) étant de basse symétrie, nous avons réalisé un affinement combiné rayons X-neutrons. Les résultats obtenus indiquent un écart de seulement 15% par rapport à un ordre de charges idéal Mn3+/Mn4+. L'affinement de la structure magnétique et les mesures de susceptibilité magnétique indiquent la formation de polarons de Zener contenant quatre cations manganèse.
Le composé YBaMn2O5,5 cristallise dans le groupe d'espace Icma, sa maille étant double de celle du composé au lanthane. Ceci est du à l'existence d'une rotation des octaèdres de la structure autour de la direction [001] dans le composé YBaMn2O5,5. L'affinement de la structure magnétique ainsi que les mesures de susceptibilité magnétique indiquent que les spins des cations Mn3+ présents dans la structure sont couplés de manière antiferromagnétique.
L'étude des composés RBaMn2O6 nous a permis d'établir un diagramme de phases en fonction de la terre rare et de la température.
Pignatelli, Isabella. "Etude cristallographique et cristallochimique des polytypes à longue péridode de micas." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10074/document.
Повний текст джерелаWe have studied by X-ray diffraction long period polytypes of micas, that are natural crystals formed far from the equilibrium condition in a magmatic system. Their stacking sequence can be considered as a more or less complex combination of three short polytypes 1M, 2M1 and 3T, called "basic structures". The aim was to obtain the first structural refinements of these polytypes, with special attention to the cationic distribution in the octahedral sheet, because, according to the literature, there seems to be a relation between this distribution and the formation of these polytypes. More than 120 crystals have been analysed, and two polytypes have been chosen, whose period is formed respectively by 4 and 5 layers (indicated as 4M3 and 5M3 respectively in Ramsdell notation). The refinement results suggest two interpretations for the formation of the 4M3 polytype, both indicating that the stacking sequence can be formed by the inter-growth of two sub-structures: a 3T with a 1M or two 2M1 sub-structures; the last case is an example of "cell twin". The results of the structural refinement of the 5M3 polytype show for the first time the coexistence of M1 and M2 types of layer, which differ for the cation distribution in the octahedral sheet, in the same polytype. The formation of this polytype can be due to the combination of two basic sub-structures and several interpretations are possible: 3T+1M, 3T+2M1, 1M+2M1, or two1M. A geological study has been done to reconstruct the history of the rhyodacite containing the long period polytypes. This rock is formed after a magma mixing, as showed by the presence of the disequilibrium textures of several minerals; this phenomenon seems to play a fundamental role for the formation of these polytypes, increasing the spiral?s activation and interactions, but also the spiral-crystal and crystal-crystal interactions
Saint-Martin, Romuald. "Croissance cristalline, structure et propriétés de transport thermique des cuprates unidimensionnels Sr2CuO3, SrCuO2 et La5Ca9Cu24O41." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112203.
Повний текст джерелаToday’s new technologies bring increasing demands to the electronics industry whose capacity of electronic circuits and related microprocessors increases very rapidly, following Moore’s law. The increasing number of transistors per unit area brings about significant heating which may be harmful to the good functioning of the systems and creates problems in the evacuation of the very localized heat generated in the electronic components. In order to control the heat flow which is produced, it is essential to use new materials able to conduct rapidly and efficiently, i. e. unidirectionally, the heat toward a heat sink. The present thesis work deals with the above described issues and presents the study of materials which have to be insulating in order to avoid short circuits in the electronic components and also exhibit a strong anisotropy of the thermal conductivity in order to evacuate the heat exclusively in one direction. Single crystals are therefore required. In order to realize thermal conductivity measurements in the best conditions, perfect homogeneous single crystals of excellent quality were synthesized by the Travelling Solvent Zone Method. This no-crucible crystal growth method allows the synthesis of impurity-free single crystals several cm long. The investigated materials are the low dimensional cuprates Sr2CuO3, SrCuO2 and La5Ca9Cu24O41 exhibiting in their structures an alignment of Cu2+ ions of spin ½ as linear chains or ladders, showing thus a distinct 1D character. Their thermal conductivity in the 1D direction is described as the sum of two contributions, one phononic and the other of magnetic origin. In order to obtain a better understanding of the different competitive interaction mechanisms, the influence on thermal conductivity, of the purity of the compounds and also of doping on the copper site has been investigated. Furthermore, structural refinement was done (X-ray and neutron diffraction) and has permitted to highlight distortions in the La5Ca9Cu24O41 samples
Allain, Magali. "Études structurales par diffraction des rayons X appliquées à des cages supramoléculaires et à des conducteurs moléculaires." Electronic Thesis or Diss., Rennes 1, 2022. http://www.theses.fr/2022REN1S081.
Повний текст джерелаThe discrete self-assembled metal assisted structures are big size edifices which do not crystallize easily and decompose rapidly. Moreover, the resolution of these structures is difficult because of the medium quality of the diffraction data sets. Different crystals selection techniques and a refinement method, applied to the supramolecular cages, are discussed, with a particular focus on the use of the Squeeze program which allows the suppression of the disordered atoms and molecules contributions. Two types of isolated and interlocked cages are structurally described. In the second part, a series of new organic conducting materials based on TMTSF and on TTF derivatives, incorporating a novel fluoro-tantalate anion, is described. The structure-conducting properties relationship is discussed. The first Bechgaard phase with a magnetic anion, namely hexafluororhenate, is described, together with its temperature dependent stability and conducting properties. TMTSF and BEDT-TTF have been associated to several mixed tantalum, rhenium or phosphorous hexafluoro anions to provide new conducting alloys. These syntheses also afforded crystalline materials with original anions. Two methods to estimate the oxydation state of the TMTSF donors are compared for several radical cation salts, either prepared during this PhD work or selected from a crystallographic data base
Dumas, Philippe. "Affinement cristallographique et étude structurale de l'acide ribonucléique de transfert de levure spécifique de l'acide aspartique." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37597630b.
Повний текст джерелаVéron, Emmanuel. "Synthèse et étude structurale de la gehlénite au bore Ca2Al2-xBxSiO7 : mécanisme de substitution B/AI et ordre local." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00703476.
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