Littérature scientifique sur le sujet « Pierre – microscopie »
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Articles de revues sur le sujet "Pierre – microscopie"
1
Erlandsen, Stanley L. « Microscopy Society of America ». Microscopy and Microanalysis 8, no I1 (juillet 2002) : 36–37. http://dx.doi.org/10.1017/s1431927602021098.
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It is my pleasure to welcome you to Microscopy and Microanalysis 2002, jointly sponsored by the Microscopy Society of America, Microbeam Analysis Society, Microscopy Society of Canada/Société de Microscopie du Canada, and the International Metallographic Society. An excellent program with an outstanding list of invited speakers for symposia has been assembled by the Program Committee consisting of the Chair, Edgar Voelkl, and Co-Chairs, David Piston (MSA), Raynald Gauvin (MAS/MSC), and Allan Lockley (IMS). Highlights of Microscopy and Microanalysis 2002 include the world's largest display of microscopes and related technologies together with outstanding sessions on all aspects of microscopy and microanalysis. Symposia will be held on 3-D electron microscopy of macromolecules and cryo-electron microscopy of macromolecules, the quantitative aspects of X-ray microscopy, confocal microscopy, biomaterials, biological and materials specimen preparation. Special sessions will be held on holography, phase imaging, deep tissue imaging, (S)TEM instrumentation, developments in focused-ion beam instruments and imaging, metallographic specimen preparation from start to finish, and the changing role of atom probe microscopes in the nanotechnology era. Advances in immunolabeling, EELS, and detectors for X-ray microanalysis also will be presented. A special analytical electron microscopy session honoring the work of Elmar Zeitler is also scheduled. A pre-meetingworkshop “Future of Materials Characterization of Charging Materialsusing Microbeam Analysis” organized by Dr. Raynald Gauvin will be held at McGill University in Montreal on August 2–3. The Local Arrangements Committee, headed by Pierre Charest, has coordinated the scheduling of many local events to complement the meeting.
2
Gagnon, Jean-Marie. « La caisse sous le microscope ». Critique 37, no 1 (12 avril 2005) : 131–45. http://dx.doi.org/10.7202/057013ar.
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Pour le meilleur ou pour le pire, de nombreux travailleurs se voient forcés par leur contrat de travail de confier à une caisse de retraite la gestion d'une partie importante de leurs économies. C'est ainsi que sont nés des investisseurs institutionnels de première importance, comme la caisse de retraite des employés municipaux de l'Ontario et celle des enseignants de cette province. La Caisse de dépôt et placement du Québec est le plus important de ces gestionnaires. Elle occupe l'avant-scène financière. Tous les Québécois, et même les Canadiens des autres provinces, scrutent ses moindres décisions. En 1993, elle a fait l'objet d'un ouvrage de Pierre Arbour.
3
Weber, Walter. « Das Herz von Frédéric de Wangen, Bischof von Basel, 1776-1782 ». Gesnerus 53, no 1-2 (27 novembre 1996) : 15–26. http://dx.doi.org/10.1163/22977953-0530102003.
Texte intégralRésumé :
leaden heart-shaped case with the year 1782 engraved, was found in the church St. Pierre in Porrentruy, Switzerland. It contained a preserved heart. Preservation had been obtained with vegetable materials and was such that microscopic and electron-microscopic preparations could be made. Tt was the heart of the bishop of Basel, Frédéric de Wangen. The heart is studied anatomically, and the historical background of the find is presented.
4
Somdet Katib et Kanchana Rungsihirunrat. « Macroscopic-microscopic characteristics and AFLP fingerprint for identification of Erythroxylum novogranatense, E. cambodianum and E. cuneatum endemic to Thailand ». International Journal of Research in Pharmaceutical Sciences 11, no 4 (3 octobre 2020) : 6144–54. http://dx.doi.org/10.26452/ijrps.v11i4.3288.
Texte intégralRésumé :
Erythroxylum novogranatense (Morris) Hieron, E. cambodianum Pierre and E. cuneatum (Miq.) Kurz in family Erythroxylaceae was traditionally used as an antipyretic, general stimulant and gastrointestinal diseases. Due to their morphological similarity, the correct identification was necessary for the quality control in herbal medicine. E. novogranatense (Morris) Hieron, E. cambodianum Pierre and E. cuneatum (Miq.) Macroscopic and microscopic characteristics evaluated Kurz endemic to Thailand according to WHO standard guideline and amplified fragment length polymorphism (AFLP) fingerprint. Morphological characters of E. novogranatense, E. cambodianum and E. cuneatum were similar in their flower, fruit and seed but different in stem and leaf. Microscopic characteristics from these three species, including constant leaf numbers, showed individual values. The stomata were classified as paracytic type. The midrib transverse section showed distinct characters of the epidermis, palisade cell, stomata, spongy cell, parenchyma, xylem vessel, phloem tissue and collenchyma. AFLP fingerprint showed highly polymorphisms 97.42% with the number of bands (349 bands) ranging between 50-750 bands. Primer E+ACG/M+CTT had the highest number of AFLP band (91 bands). The dendrogram generated from UPGMA could separate these three species. In summary, the combination of morphological characteristics, microscopic investigation and AFLP fingerprinting can be used to identify plant species and determine the genetic relationship among three Erythroxylum species.
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Carmichael, Élizabeth, Stéphane Doyon et Isabelle Paradis. « Chronique du Centre de conservation du Québec ». Études 16 (14 septembre 2018) : 47–62. http://dx.doi.org/10.7202/1051324ar.
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Pour cette troisième collaboration à Rabaska, le Centre de conservation du Québec (Ccq) nous offre deux textes préparés autour du thème de la miniature. Stéphane Doyon, de l’atelier bois, traite de la restauration de la maquette vieille de 150 ans d’une église représentée à l’échelle 1:24 et de grande qualité, tandis que Isabelle Paradis, de l’atelier métal-pierre, décrit l’apport que peut avoir l’étude microscopique des finis peints à la documentation et la conservation des bâtiments patrimoniaux.
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Castro, Ray Mundo Martins, Ruy Gastaldoni Jaeger, Sinesio Talhari et Ney Soares de Araújo. « Piedra negra : estudo de seu agente etiológico em microscopia eletrônica de varredura ». Revista do Instituto de Medicina Tropical de São Paulo 29, no 4 (août 1987) : 251–52. http://dx.doi.org/10.1590/s0036-46651987000400011.
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No presente trabalho foi realizado estudo em microscopia eletrônica de varredura do fungo Piedraia hortae, através de material obtido de lesões no cabelo de índios do Amazonas. O exame em microscopia eletrônica revelou ascosporos poliédricos, ovóides e arredondados, arranjados isoladamente ou na forma de pseudohifas, de permeio a material extracelular densamente compactado.
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Barron, Laurence D. « False Chirality, Absolute Enantioselection and CP Violation : Pierre Curie’s Legacy ». Magnetochemistry 6, no 1 (15 janvier 2020) : 5. http://dx.doi.org/10.3390/magnetochemistry6010005.
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The 1884 suggestion of Pierre Curie (1859–1906) that the type of dissymmetry shown by collinear electric and magnetic fields may induce an enantiomeric excess, in a chemical reaction that would otherwise produce a racemic mixture, is explored in the context of fundamental symmetry arguments. Curie’s arrangement exhibits false chirality (time-noninvariant enantiomorphism), and so it may not induce absolute enantioselection (ae) in a process that has reached thermodynamic equilibrium, since it does not lift the degeneracy of chiral enantiomers. However, it may do so in far-from-equilibrium processes via a breakdown in microscopic reversibility analogous to that observed in elementary particle processes under the influence of CP violation, the associated force possessing false chirality with respect to CP enantiomorphism. In contrast, an influence like circularly polarized light exhibiting true chirality (time-invariant enantiomorphism) lifts the degeneracy of enantiomers, and so may induce ae in all circumstances. Although to date, ae has not been observed under the influence of Curie’s arrangement of collinear electric and magnetic fields, it is argued that two different experiments have now demonstrated ae under a falsely chiral influence in systems far from equilibrium, namely in a spinning sample under a gravitational field, and in the separation of enantiomers at a ferromagnetic surface.
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Guédon, Jeanne-Sylvine, et Jean-Louis Durville. « L’analyse pétrographique : un outil de la géologie de l’ingénieur ». Revue Française de Géotechnique, no 164 (2020) : 3. http://dx.doi.org/10.1051/geotech/2020020.
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L’examen pétrographique des matériaux rocheux utilisés en génie civil (pierres en œuvre, granulats pour béton) permet de mettre en évidence des éléments nuisibles ou des caractéristiques défavorables et, plus généralement, d’évaluer l’aptitude à une utilisation donnée, en complément d’essais pétrophysiques et mécaniques. L’accent est mis sur l’analyse pétrographique de lames minces au microscope optique polarisant, éventuellement complétée par l’examen au microscope électronique à balayage. Cette analyse peut être utilisée a priori, lors d’une recherche de matériaux, ou pour le diagnostic de désordres observés sur ouvrages. Plusieurs exemples sont donnés : dissolution ou gélifraction de calcaires, altération par lessivage des argiles dans un grès poreux, fissuration d’un marbre en œuvre sous l’effet des variations de température, aide au diagnostic de roches siliceuses vis-à-vis de l’alcali-réaction. Quelques normes ou recommandations relatives à l’examen pétrographique sont commentées. On insiste en conclusion sur les compétences, spécifiques aux questions de géologie de l’ingénieur, que doit posséder le pétrographe.
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Wang, Qing Cheng, Xiao Dong Yang, Guang Rui Shang, Zhuo Juan Yang, Guo Hua Cao et Hong Ji Xu. « Modeling and Analysis of the Supporting Force of Water Strider’s Legs ». Applied Mechanics and Materials 138-139 (novembre 2011) : 356–61. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.356.
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In this paper, the microstructure of the water strider’s legs was observed, the lengths, diameters of the water strider’s legs were measured by the instruments such as scanning electron microscope . The supporting force model of water strider’s legs was established, the factors associated with the supporting force were analyzed. The critical conditions in which water strider’s legs do not pierce the water surface were discussed. the maximum supporting force of water strider’s single hind leg was calculated according to the supporting force model of water strider’s legs, the calculated value is 3399.13×10-6N, which is about 17 times of its body weight.
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Carmichael, Stephen W. « Probing Individual Proteins in Unsupported Membranes ». Microscopy Today 15, no 4 (juillet 2007) : 3–5. http://dx.doi.org/10.1017/s1551929500055644.
Texte intégralRésumé :
Proteins in biologic membranes perform a large variety of essential functions. The fact that about one third of all genes code for membrane proteins, and that the majority of drugs target these proteins, attest to that fact. However, until now, proteins have been studied under artificial conditions, such as after being crystallized, frozen, or adsorbed to a substrate. Rui Pedro Gonçalves, Guillaume Agnus, Pierre Sens, Christine Houssin, Bernard Bartenlian, and Simon Scheuring have devised a novel setup with the atomic force microscope (AFM) to allow proteins to be probed while they are in unsupported membranes. Their method is similar in principle to methods where a small area of a membrane is sampled, such as when a piece of membrane is examined by patch clamping. The difference is that instead of attaching a membrane to the end of a pipette, it is spread across a piece of perforated Si(001).
Thèses sur le sujet "Pierre – microscopie"
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Berthonneau, Jérémie. « Le rôle des minéraux argileux dans la dégradation de la pierre : application à la conservation de la "Pierre du Midi" en termes de durabilité et compatibilité des matériaux en oeuvre ». Phd thesis, Aix-Marseille Université, 2013. http://tel.archives-ouvertes.fr/tel-00958572.
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De par l'étendue de leur répartition géographique et la facilité de leur extraction, les molasses d'âge miocène du bassin rhodanien ont été largement exploitées par l'homme comme pierre de construction depuis le début de l'ère chrétienne. Le patrimoine bâti provençal érigé à l'aide de ce matériau, connu sous le nom de " Pierre du Midi ", et exposé aux intempéries depuis plus de cinq cents ans présente cependant un certain nombre de morphologies de dégradations. Parmi ces dégradations, la desquamation en plaques a la particularité de se développer en dehors des zones de remontées capillaires ainsi qu'en l'absence de sels solubles, de sollicitation mécanique, de pollution atmosphérique ou de colonisation biologique. Ce phénomène est donc induit par les propriétés intrinsèques du matériau et son comportement vis-à-vis des conditions environnementales. L'objectif de ce travail de recherche est d'établir le rôle joué par les minéraux argileux dans ce phénomène de dégradation spécifique. Une étude de terrain a pu mettre en exergue que le degré de desquamation en plaques observable sur des monuments de périodes de construction équivalentes est variable suivant l'origine des assises. A l'issue de cette reconnaissance, neuf échantillons représentatifs de la variabilité du degré de desquamation en plaques ont été prélevés en carrières. Une étude conventionnelle sur les caractéristiques pétrographiques et la composition minéralogique de ces types de " Pierre du Midi " a tout d'abord été conduite. Par la suite, une définition précise du cortège de minéraux argileux a été menée par le biais d'une approche méthodologique originale. Cette dernière combine la caractérisation cristallochimique au MET-EDS à la simulation des raies 00ℓ de diffraction des rayons X. Cette méthode a permis de déterminer les quantités de chacune des phases de phyllosilicate composant les différents cortèges. Le lien entre la quantité de feuillets de phyllosilicates expansifs et le degré de desquamation en plaques a pu, de ce fait, être mis en évidence. Après avoir déterminé les propriétés de stockage et de transfert des fluides des différents types de pierre, leur comportement hydromécanique a été évalué. L'ensemble de ces propriétés pétrophysiques a permis de mettre en relief la forte hétérogénéité du matériau à l'étude. Les indices de durabilité calculés à partir de ces résultats manquent cependant de pertinence quant à la prédiction du phénomène de desquamation en plaques. Après une analyse statistique (ACP) des données expérimentales, la meilleure interprétation suggère que ce phénomène soit déclenché par l'interaction entre les feuillets de phyllosilicates expansifs et les molécules d'eau. Cette interaction se manifeste par le comportement hydromécanique des pierres qui entraîne leur dégradation. Ce dernier est largement contrôlé par les propriétés physiques de stockage et de transfert des fluides qui conditionnent l'accommodation des déformations au niveau macroscopique.
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Godet, Marie. « Jaunissement de la pierre par laser : origines et remèdes ». Thesis, Paris, Muséum national d'histoire naturelle, 2017. http://www.theses.fr/2017MNHN0001/document.
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Le nettoyage laser Nd:YAG Q-switched (1064 nm) confère souvent aux surfaces nettoyées un aspect plus jaune que les autres techniques de nettoyage. Cet effet jaune peut conduire à l’obtention de contrastes de couleur inesthétiques si différentes techniques de nettoyage sont utilisées sur un même ensemble architectural, comme c’est le cas par exemple pour le portail des Valois de la basilique Saint-Denis près de Paris. Une des hypothèses émises pour expliquer le phénomène est que le jaunissement laser serait lié à la présence de résidus d’irradiation nanométriques formés par interaction du faisceau laser avec la salissure, en particulier les croûtes noires gypseuses communément observées sur les monuments en pierre. Dans le cadre de cette thèse, une méthodologie analytique multi-échelle allant jusqu’à l’échelle nanométrique a été développée pour observer et caractériser les composés néoformés responsables de la coloration jaune. Des éprouvettes de croûtes modèles à base d’hématite et de croûtes reconstituées à partir de croûte noire naturelle ont été élaborées. La croûte noire naturelle a été caractérisée pour déterminer les composés susceptibles de réagir au faisceau laser et donc de contribuer au jaunissement. Des oxydes de fer (hématite, magnétite, maghémite) et des cendres volantes silico-alumineuses issues de la combustion du charbon ont ainsi pu être mis en évidence. La nature chimique et structurale des produits de l’irradiation laser des éprouvettes a ensuite été examinée à l’aide d’un panel de techniques incluant entre autres la microscopie électronique à transmission (MET) couplée à la diffraction électronique et aux spectroscopies de rayons X par dispersion d’énergie (EDX) et de perte d’énergie des électrons (EELS). Des nanostructures cristallisées sous forme de nano-sphères et de nano-résidus ont ainsi pu être observées. La caractérisation de la composition chimique à l’échelle nanométrique a permis de révéler la présence de fer dans toutes les nanostructures. Une étude approfondie de la couleur a en outre permis de relier les propriétés colorimétriques du processus de jaunissement à la nature des nano-composés néoformés par irradiation laser. D’autre part, le portail des Valois de la basilique Saint-Denis a été le sujet d’une étude de cas qui est venue complémenter la recherche tout en ancrant l’étude dans la réalité du monde de la conservation des monuments historiques. Enfin des essais de remédiation ont démontré les potentialités de l’utilisation d’un rayonnement UV pour atténuer ou ne pas produire de jaunissement. In fine, ce travail a permis de démontrer que le phénomène de jaunissement laser observé à l’échelle macroscopique est intimement lié à des transformations de matière à l‘échelle nanométrique, induites par l’interaction du rayonnement laser avec les oxydes de fer et les cendres volantes présents dans les encrassementsNd:YAG Q-Switched laser cleaning of soiled stone at 1064 nm can sometimes result in yellower appearances than other conventional cleaning techniques. This yellowing effect can lead to unsightly colour contrasts if different cleaning techniques are used on the same architectural complex, as is the case for the Valois Portal of the Saint-Denis basilica near Paris. One argument made to explain the phenomenon is that the laser yellowing is linked to the creation of nano-sized irradiation residues through the laser beam interaction with soiling matter such as black gypseous crusts. In this study, a multi-scale analytical method extending to the nanoscale has been used to observe and characterize the neo-formed compounds accountable for the yellow discoloration. Samples of model crusts containing hematite and reconstituted crusts prepared with natural black crust have been synthetized. The natural black crust has been characterized in order to identify the compounds that may react under the laser beam and thus contribute to the yellowing effect. Iron oxides (hematite, magnetite and maghemite) and aluminosilicate fly-ashes originating from coal combustion have been discovered. The chemical and structural nature of irradiation products has then been investigated by several techniques including in particular transmission electron microscopy (TEM) coupled with electronic diffraction and energy-dispersive X-ray (EDX) and electron energy-loss (EELS) spectroscopies. Iron containing nanostructures crystallized in the form of nano-spheres and nano-residues have been evidenced and characterized. By studying thoroughly the colour, the colorimetric properties of the yellowing process have been linked to the nature of the neo-formed compounds. Furthermore a case study on the Valois Portal has completed the research while setting it within the reality of the conservation world. Finally experiments with UV light have shown the promising potentiality of this tool as a remedy to the yellowing effect. In summary, this study has demonstrated that the yellowing phenomenon observed at the macroscale is intimately linked to matter transformations occurring at the nanoscale, induced by the interaction between the laser beam and the iron oxides and fly-ashes found in black crusts
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Cifuentes, Nava Maria del Carmen. « Mode de formation des muscles du vol chez un insecte lépidoptère rhopalocère : Pieris Brassicae L ». Paris 6, 1986. http://www.theses.fr/1986PA066502.
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INÁCIO, Cícero Pinheiro. « Modelo de infecção in vitro da piedra branca, análise dos aspectos morfológicos, ultraestruturais e abordagem de identificação polifásica dos agentes etiológicos ». Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16917.
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CNPq
Piedra branca é uma infecção de etiologia fúngica caracterizada pela formação de nódulos restritos a porção extrafolicular dos pelos e cabelos, sendo ocasionada por leveduras do gênero Trichosporon. O diagnóstico é clínico e laboratorial micológico, sendo concluído com a identificação precisa do agente etiológico. Esta pesquisa teve como objetivo elaborar um modelo de infecção in vitro da piedra branca, analisar os aspectos morfológicos e ultraestruturais dos nódulos e seus agentes, e autenticar taxonomicamente os isolados por meio de uma abordagem de identificação polifásica. A infecção dos cabelos foi induzida utilizando 18 isolados do gênero Trichosporon, mantidos na Coleção de Culturas Micoteca URM. Para confirmação taxonômica dos isolados, foi adotada métodos empregados na taxonomia clássica, Espectroscopia de Massa (MALDI-TOF MS) e sequenciamento das regiões ITS (ITS1–5.8s-ITS2), IGS1 (Intergenic spacer) e domínios D1/D2 do rDNA. Foi verificado que 15 (83,33%) dos isolados de levedura foram identificados por meio da Espectrometria de Massa MALDI-TOF MS. Os métodos moleculares foram considerados os mais precisos, possibilitando a identificação dos isolados de levedura como: T. asahii (8), T. faecale (3), T. montevideense (5), T. mycotoxinivorans (1) e Hyphopichia burtonii (1). Os nódulos típicos foram formados por 12 isolados, seis formaram nódulo atípico (Quatro de T. asahii e dois de T. montevideense) e dois não formaram nódulo (um de T. montevideense e um de T. faecale). Os constituintes químicos detectados nos nódulos foram carbono, oxigênio, sódio, cálcio, manganês e magnésio. A consistência friável dos nódulos está relacionada com as baixas concentrações de cálcio e enxofre, conferindo a facilidade de rompimento do nódulo. Neste modelo, foi verificado que temperaturas elevadas e umidade excessiva não estão relacionadas com o desenvolvimento desta tricopatia.
White piedra is a fungal infection caused by Trichosporon species. The clinical condition of this mycosis is the production of white nodules adhered to the hair shaft. The diagnosis take in account the clinical feature and mycological laboratory results, which is finalized with the precise etiologic agent identification. This research aimed to develop an in vitro infection model of white piedra, analyzing the morphological and ultrastructural aspects of nodules and aetiological agents, and to identify the isolates by a polyphase approach. The infection of the hair was induced using 18 isolates of the genus Trichosporon, from the Culture Collection Micoteca URM. To taxonomic confirmation of the Trichosporon isolates, were adopted methods used in the classical taxonomy, Mass Spectroscopy (MALDI-TOF MS) and sequencing of the ITS (ITS1-5.8s-ITS2), IGS1 (Intergenic spacer) and D1/D2 domains of rDNA regions. A total of 15 (83.33%) yeast isolates were identified by mass spectrometry MALDI-TOF MS. Molecular tols were considered more accurate, allowing the identification of all yeast isolates as: T. asahii (8), T. faecale (3), T. montevideense (5), T. mycotoxinivorans (1) and Hyphopichia burtonii (1). Typical nodules were formed by 12 isolates, 6 isolates formed atypical nodules (T. asahii (4) and T. montevideense (2)) and 2 isolates did not formed nodules (T. montevideense (1) and T. faecale (1)). The chemical constituents detected in the nodules were carbon, oxygen, sodium, calcium, manganese and magnesium. The softh consistency of the nodules is associated with the low concentrations of calcium and sulfur, that providing ease disruption of the nodule. In this in vitro infection model, it was observed that the temperatures and humidity were not related to the development of this tricopatia.
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ROCHA, Ana Paula Santiago. « Piedra preta : características in vitro, aspectos ultraestruturais e identificação de novos agentes etiológicos ». Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16596.
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CAPEs
Piedra preta é uma micose superficial assintomática, caracterizada pela formação de nódulos rígidos e enegrecidos localizados ao longo do fio capilar. É uma micose considerada rara, inócua, podendo acometer tanto o gênero feminino quanto o masculino em qualquer faixa etária. Piedraia hortae, agente etiológico desta micose, é um fungo filamentoso, demáceo que produz o pigmento melanina, caracterizando uma coloração enegrecida na parede celular e nas estruturas fúngicas. Este pigmento, por sua vez, é caracterizado como um potente fator de virulência, favorecendo, desse modo, seu potencial em causar parasitismo no cabelo. Na literatura, não há referências citando que outros fungos demáceos, que formam ascostroma, ascos e ascosporos, semelhantes ao P. hortae, possam ser agente etiológico dessa feohifomicose. Assim, o objetivo desse trabalho foi avaliar a capacidade de fungos demáceos de formarem nódulos na porção extrafolicular de fios de cabelo humano, semelhantes aos da piedra preta. Foram obtidos onze isolados de fungos demáceos, sendo dez da Coleção de Cultura Micoteca URM, UFPE, os quais estavam preservados sob óleo mineral e posteriormente semeados em meio Àgar Batata Dextrose para estimulação do crescimento; e um isolado proveniente do Laboratório de Micologia Médica. Foram preparadas suspensões dos isolados dos fungos demáceos em 2,0 ml de água destilada esterilizada, ajustada para concentração final de 106 células/mL. Em seguida, vertidos separadamente 0,5 mL de cada suspensão sobre os fios de cabelo contidos nas placas de Petri previamente esterilizada e mantidas a temperatura de 28°C e 37°C. O experimento foi conduzido através de observações macroscópicas e microscópicas dos cabelos durante 40 dias e acompanhado em intervalo de 5 dias. Dois isolados (970 e 3334) mostraram um elevado potencial capaz de causar infecção no fio capilar. Entretanto, oito isolados apresentaram apenas uma colonização. Exophiala dermatitidis e Cladosporium tenuissimo foram capazes de formar nódulos semelhantes ao da piedra preta, porém estruturas de reprodução como ascostroma, ascos e ascosporos, não foram vizualizadas.Todavia, podemos inferir que esses fungos apresentam um potencial capaz de parasitar os fios de cabelo, degradando e destruindo a queratina e os componentes cutiulares, sendo o potente agente de tricomicose.
Black piedra is a superficial mycosis asymptomatic, characterized by the formation of hard lumps and blackened located along the capillary yarn. It is a mycosis considered rare, innocuous and can affect both the female and the male at any age. Piedraia hortae, the etiologic agent of this mycosis, is a filamentous fungus, dematiaceous that making the pigment melanin, featuring a blackish color in the cell wall and the fungal structures. This pigment, in turn, is characterized as a potent virulence factor, facilitating there by the potential to cause parasitic hair. In the literature, there are no references citing that other demáceos fungi that form ascostroma, asci and ascospores, similar to P. hortae, may be etiologic agent of this phaeohyphomycosis. The objective of this paper is to demáceos fungal ability to form nodules in extrafollicular portion of human hair, similar to those of black piedra. Eleven isolates of fungi demáceos, obtained of the Culture Collection URM, UFPE, which were preserved under mineral oil and then plated on potato dextrose agar medium for growth promotion; and one isolated from the Medical Mycology Laboratory. Fungal isolates demáceos suspensions were prepared in 2.0 ml of sterile distilled water, adjusted to a final concentration of 106cells / ml. Then separately poured into 0.5 mL of each suspension over the strands of hair contained in the previously sterile Petri dishes and kept at 28 °C and 37 °C. The experiment was conducted by macroscopic and microscopic observations of the hair for 40 days and monitoring in the range of 5 days. Two isolates (970 and 3334) showed a high potential capable of causing infection in the capillary. However, eight isolates showed only colonization. Exophiala dermatitidis and Cladosporium tenuissimo was capable of forming nodules were similar to those of black piedra; however ascostroma structures such as playback, asci and ascosporos were not displayed. However, we can infer that these fungi have the potential able to parasitize the hairs, degrading and destroying the keratin and cuticulares components, the powerful Trichomycosis agent.
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Dierolf, Martin Johannes Verfasser], Franz [Akademischer Betreuer] Pfeiffer, Pierre [Akademischer Betreuer] Thibault et Reinhard [Akademischer Betreuer] [Kienberger. « Ptychographic X-ray Microscopy and Tomography / Martin Johannes Dierolf. Betreuer : Franz Pfeiffer. Gutachter : Pierre Thibault ; Reinhard Kienberger ; Franz Pfeiffer ». München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1091562199/34.
Texte intégral
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Blais, Catherine. « Rôle et métabolisme des ecdystéroïdes au niveau des disques imaginaux alaires de Pieris brassicae L. (Lepidoptère) ». Paris 6, 1986. http://www.theses.fr/1986PA066217.
Texte intégralRésumé :
Les disques imaginaux alaires de larves âgées et de prénymphes de Pieris brassicae (Lépidoptère) se différencient in vitro en présence d'ecdysone (0,2-4 mu m) ou de 20-hydroxyecdysone (0,2 mu m). Ces hormones sont métabolisées par les tissus imaginaux (organes entiers, homogénats ou fractions subcellulaires); les réactions intéressent trois positions de la molécule d'ecdysone: les carbones c-26 (26-hydroxylation et formation d'acides ecdysonoïques), c-20 (20-hydroxylation) et c-3 (formation réversible de dérivés 3-déhydro). Les systèmes enzymatiques responsables des réactions d'oxydation en c-20 (microsomal) et d'oxydo-réduction en c-3 (cytosolique) ont été caractérisés chez les chrysalides. Cette étude soulève le problème de la signification physiologique de ce métabolisme des ecdystéroïdes (inactivation et/ou transformation en métabolites actifs biologiquement) dans les disques imaginaux, organes-cibles des hormones
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Pieper, Christoph Michael Verfasser], Jörg [Akademischer Betreuer] Enderlein, Helmut [Akademischer Betreuer] Grubmüller et Tim [Akademischer Betreuer] [Salditt. « Diffusion and Flow on Microscopic Length Scales Studied with Fluorescence Correlation Spectroscopy / Christoph Michael Pieper. Gutachter : Jörg Enderlein ; Helmut Grubmüller ; Tim Salditt. Betreuer : Jörg Enderlein ». Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://d-nb.info/1042305552/34.
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MOUCHE, Fabrice. « Etude structurale de macromolécules biologiques par cryomicroscopie électronique, reconstruction tridimensionnelle et recalage de données de cristallographie aux rayons X ». Phd thesis, Université Pierre et Marie Curie - Paris VI, 2001. http://tel.archives-ouvertes.fr/tel-00006224.
Texte intégralRésumé :
Parmi les disciplines représentatives de la biostructure, la cryomicroscopie électronique permet, au travers de techniques adaptées, d'atteindre de hautes résolutions. Mon travail a porté sur l'étude d'une catégorie de molécules, les particules isolées à faible degré de symétrie et entre autres sur les pigments respiratoires extracellulaires tels que les hémocyanines de céphalopodes (Vampyroteuthis infernalis, Benthoctopus species, Sepia officinalis) et une hémoglobine d'annélide (Lumbricus terrestris). Une approche empirique a été retenue, et nous a permis de différencier les informations techniques et les données biologiques. Le premier but, basé sur l'utilisation d'un matériel biologique connu, était de travailler sur les techniques d'observation de l'échantillon, d'analyse des images, de reconstruction et de correction des structures. Le deuxième but était d'apporter des réponses de type biologique, par le biais de ces améliorations techniques. Le début de ma thèse fut lié à l'utilisation d'un microscope équipé d'un cristal de LaB6, ne permettant pas de descendre significativement sous la barre des 20 Å. Néanmoins, il nous a permis de répondre à une question de type phylogénétique (Benthoctopus species et Vampyroteuthis infernalis appartiennent à des ordres frères), et de démontrer l'importance du type de microscope et de la source électronique associée. Naturellement, l'étape suivante fut d'accéder à un microscope équipé d'un canon à émission de champ. L'accès sporadique et sur de courtes périodes à ce type de microscope, dont les premiers exemplaires sont arrivés en France en 2000, ne m'ont pas permis de tester systématiquement tous les modes d'utilisation. Malgré tout, les résultats que nous avons obtenu ont validé les avantages de l'émission de champ. Certes, la barre des 6-7 Å de résolution, donnant partiellement accès aux informations relatives à la structure secondaire des protéines, n'a pas encore été atteinte, mais il apparaît que les progrès que nous avons effectués tendent vers cette valeur. Cette progression repose en partie sur l'amélioration des méthodes de collecte des images, de reconstruction et de correction de la fonction de transfert de contraste.
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Meyerhöfer, Dietrich. « Johann Friedrich von Uffenbach. Sammler – Stifter – Wissenschaftler ». Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-13B0-E.
Texte intégralLivres sur le sujet "Pierre – microscopie"
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Orrells, Daniel, Duncan F. Kennedy, Nicoletta Momigliano, Robert L. Fowler, Juan Christian Pellicer, Elizabeth Prettejohn et Neville Morley. Antiquity in Print. Sous la direction de Nora Goldschmidt, Fiachra Mac Góráin et Charles Martindale. Bloomsbury Publishing Plc, 2024. http://dx.doi.org/10.5040/9781350407800.
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Daniel Orrells examines the ways in which the ancient world was visualized for Enlightenment readers, and reveals how antiquarian scholarship emerged as the principal technology for envisioning ancient Greek culture, at a time when very few people could travel to Greece which was still part of the Ottoman Empire. Offering a fresh account of the rise of antiquarianism in the 18th century, Orrells shows how this period of cultural progression was important for the invention of classical studies. In particular, the main focus of this book is on the visionary experimentalism of antiquarian book production, especially in relation to the contentious nature of ancient texts. With the explosion of the Quarrel between the Ancients and the Moderns, eighteenth-century intellectuals, antiquarians and artists such as Giambattista Vico, Johann Joachim Winckelmann, the Comte de Caylus, James Stuart, Julien-David Leroy, Giovanni Battista Piranesi and Pierre-François Hugues d’Hancarville all became interested in how printed engravings of ancient art and archaeology could visualize a historical narrative. These figures theorized the relationship between ancient text and ancient material and visual culture – theorizations which would pave the way to foundational questions at the heart of the discipline of classical studies and neoclassical aesthetics. What did it meant to see and visualize ancient Greece in the eighteenth century, and why does that still matter today? Antiquity in Print: Visualizing Greece in the Eighteenth Century provides a fresh, new narrative about the emergence of classical studies as a discipline during the Enlightenment. The book examines how antiquarians during the mid-eighteenth century illustrated their narratives about the history of ancient art – in particular, of ancient Greece. In the seventeenth and eighteenth centuries, science became spectacular: with the invention of the modern microscope and the telescope and the increase in imperial and commercial travel, new, strange and exoticized worlds were being depicted for European readers. Advances in mathematics and logic also interrogated the truthfulness of ancient texts. The so-called Quarrel between the Ancients and the Moderns erupted. Antiquity in Print explores how key eighteenth-century intellectuals and antiquarians such as Giambattista Vico, Alexander Pope, Bernard de Montfaucon, Johann Joachim Winckelmann, Pierre-Jean Mariette, the Comte de Caylus, James Stuart, Julien-David Leroy, Giovanni Battista Piranesi and Pierre-François Hugues d’Hancarville all became interested in how printed engravings of ancient art and archaeology could visualize a historical narrative. Antiquity in Print shows how these figures theorized the relationship between ancient text and ancient material and visual culture, and how these theorizations would pave the way to the foundational questions at the heart of the discipline of classical studies and neoclassical aesthetics.
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Beamish, Rob. Steroids. An Imprint of ABC-CLIO, LLC, 2011. http://dx.doi.org/10.5040/9798216018940.
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Sports fans or not, readers will be fascinated by this revealing examination of the pressures leading to the widespread use of steroids in sport and the negative, unintended consequences of their ban. From Baron Pierre de Coubertin's original objectives in establishing the modern Olympic Games to the increasingly widespread use of performance-enhancing drugs during the Cold War to the 1998 drug scandal during the Tour de France and beyond, Steroids: A New Look at Performance-Enhancing Drugs puts the social construction of steroids as a banned substance under the microscope and interprets the implications of that particular conception of steroid use in sport. Clearly written and highly accessible for all readers, this book addresses a pressing issue in professional and high-performance sport—the use of steroids—by placing it within the historical context of the ongoing desire to achieve the pinnacle of human sport. Topics examined in detail include the three major crises of Ben Johnson's positive test in the 1988 Seoul Olympics, the creation of the World Anti-Doping Association, and the House Committee on Government Oversight's probe into steroid use. The author provides a critical examination of the current ban on steroids, and boldly advocates a common-sense solution to the complex problem of steroid use in sport: the adoption of harm-reduction strategies and policies rather than outright proscription.
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Iliopoulos, John. Introduction. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198805175.003.0001.
Texte intégralRésumé :
The discovery of a new elementary particle at LHC, the large hadron collider operating at CERN, has stirred great emotion not only in the scientific community, but also in world media. In this little book we argue that this is due to the potential scientific of the discovery: it was the last missing piece in our struggle to understand the structure of the world and it may shed light on the origin of masses in the early Universe. We will explain that this particle is the remnant of a phase transition which occurred when the Universe was only a tiny fraction of a second old. In doing so we will uncover a surprising connection between the laws of physics which we discover in our laboratories while studying the microscopic structure of matter and those which govern the large scale evolution of the world.
Chapitres de livres sur le sujet "Pierre – microscopie"
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Lavrov, Andrey I., et Alexander V. Ereskovsky. « Studying Porifera WBR Using the Calcerous Sponges Leucosolenia ». Dans Methods in Molecular Biology, 69–93. New York, NY : Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2172-1_4.
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AbstractSponges (Porifera), basal nonbilaterian metazoans, are well known for their high regenerative capacities ranging from reparation of a lost body wall to whole-body regeneration from a small piece of tissues or even from dissociated cells. Sponges from different clades utilize different cell sources and various morphological processes to complete the regeneration. This variety makes these animals promising models for studying the evolution of regeneration in Metazoa. However, there are few publications concerning the regenerative mechanisms in sponges. This could be partially explained by the delicacy of sponge tissues, which requires modifying and fine adjusting of common research protocols. The current chapter describes various methods for studying regeneration processes in the marine calcareous sponge, Leucosolenia. Provided protocols span all significant research steps: from sponge collection and surgical operations to various types of microscopy and immunohistochemical studies.
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McKeever, Paul E. « Laboratory Methods of Brain Tumor Analysis ». Dans Principles And Practice Of Neuropathology, 272–97. Oxford University PressNew York, NY, 2003. http://dx.doi.org/10.1093/oso/9780195125894.003.0015.
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Abstract This chapter is divided into four categories: specimen procurement, cell-type-specific markers, measures of proliferative capacity, and genetic markers (Nelson et al., 1983; Russell and Rubinstein, 1989; Burger et al., 1991; Burger and Scheithauer, 1994). Only methods applicable to a cell or tissue specimen are within the scope of this review. The tables summarize information and cite references that document methods. Specimen Procurement The appropriate time to realize that more tissue is needed is during the biopsy procedure rather than after surgery. Intraoperative monitoring of biopsy tissue is recommended to optimize sampling and preparation of tissue for further procedures (Fig. 15.1A,B; see Color Fig. 15.1B in separate color insert). This allows the pathologist to gauge the adequacy of the specimen. Specimens which reveal only hemorrhage, necrosis, and normal or gliotic brain tissue require further sampling. Brain with a few glia (gliosis vs. glioma) is a particular problem and should be sampled further. Intraoperative monitoring of the biopsy specimen allows determination of the best region from which to take another specimen for permanent section. Microscopic features may indicate the need for microbiologic culture or for special fixation for immunohistochemistry. Unless the intraoperative microscopic diagnosis is unequivocal, a small piece should be put in glutaraldehyde for possible electron microscopy. Such samples can be discarded if not needed but the need for rebiopsy can be avoided if they are needed.
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Knight Powell, Amy. « Bruegel’s Dirty Little Atoms ». Dans Contamination and Purity in Early Modern Art and Architecture. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland : Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789462988699_ch06.
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The Scientific Revolution was dirty: ‘now [the sun] shows itself to us as partly impure and spotty,’ Galileo wrote after looking at that celestial body through a telescope in 1612. Like the telescope, the microscope revealed the generally mottled nature of things. This was an aesthetic problem. The revelation of spots, stains, and cavities turned perfectly whole bodies complicated and ugly. Meanwhile, the equally ‘impure and spotty’ theory of atomism began to take hold. But well before the popularization of the telescope and microscope or the admission of atomism to plausibility, the artist Pieter Bruegel the Elder unfurled a ‘dirty’ atomism across panel and paper.
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Chen, C. Julian. « Piezoelectric Scanner ». Dans Introduction To Scanning Tunneling Microscopy, 213–36. Oxford University PressNew York, NY, 1993. http://dx.doi.org/10.1093/oso/9780195071504.003.0009.
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Abstract The heart of STM is a piezoelectric scanner, sometimes called piezadrive or simply pieza. In this chapter, we provide a brief summary of the basic physics of piezoelectricity and piezoelectric ceramics relevant to the applications in STM. Three major types of piezodrives, the tripod, the bimorph, and the tube, are analyzed in detail. The piezoelectric effect was discovered by Pierre Curie and Jacques Curie (1880), about 100 years before the invention of the STM.4 A sketch of their pioneering experiment is shown in Fig. 9.1. A long, thin quartz plate, cut from a single crystal, was sandwiched between two tin foils. While one tin foil is grounded, another tin foil was connected to an electrometer. By applying a weight to generate vertical tension, an electrical charge was detected by the electrometer.
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Biborski, Mateusz, Marcin Biborski et Janusz Stępiński. « Badania nad technologią wybranych zabytków żelaznych ». Dans Ocalone Dziedzictwo Archeologiczne, 135–44. Wydawnictwo Profil-Archeo ; Muzeum im. Jacka Malczewskiego w Radomiu, 2020. http://dx.doi.org/10.33547/oda-sah.10.zn.12.
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The extensive programme of research on artefacts recovered from the Przeworsk culture cemetery in Żelazna Nowa, Comm. Magnuszew, included performing a series of metallographic analyses. Only three objects were subjected to the analyses due to their good preservation: two knives and a shield grip fragment. The aim was to determine the technology of manufacture of particular objects and to identify the raw materials from which they were forged. Microstructure was examined using a Leica DMLM metallurgical microscope, and the observed metal structures were photographed. In addition, metal hardness was measured using the Vickers method, with a load of 10 kG (98N). Carbon content of steel was determined based on microscopic observation. As demonstrated by the analyses, the artefacts were made from metal obtained through the bloomery process from bog iron with a significant admixture of phosphorus. The technology used for manufacture of the analysed artefacts was not particularly sophisticated. They were forged from single pieces of bloomery iron. The only exception is a knife (inv. no. CCLII/15), which was forged from two different pieces of metal welded together, namely from a piece of high phosphorus iron and a piece of soft steel. This made the knife more flexible, while rendering its blade sufficiently hard and more resistant to abrasion. One cannot rule out that the blades of both knives were originally hardened by local carburisation, in connection with later thermal processing (quenching). The results of metallographic research seem to support our assumptions. The two knives and the shield grip were manufactured in local Przeworsk culture workshops, perhaps from iron originating from the centre of metallurgy in the Mazowsze (Mazovia) region.
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Chen, C. Julian. « Tip Treatment ». Dans Introduction To Scanning Tunneling Microscopy, 281–94. Oxford University PressNew York, NY, 1993. http://dx.doi.org/10.1093/oso/9780195071504.003.0013.
Texte intégralRésumé :
Abstract The importance of tip treatment in STM was recognized by Binnig and Rohrer from the very beginning of their experimentation (Binnig and Rohrer, 1982). In order to understand the observed resolution, they realized that if the tip would be considered as a piece of continuous metal, the radius must be smaller than JO A. The number does not appear very meaningful for a tip radius, but it is nevertheless clear that conventional field-emission tips of radius I 00-1000 A would not provide the resolution they observed.
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Chen, C. Julian. « Mechanical Design ». Dans Introduction to Scanning Tunneling Microscopy, 329–42. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198856559.003.0013.
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This chapter discusses various mechanical designs for STM and AFM. The central piece of the mechanical design of STM and AFM is the course positioner. Therefore, various types of course positioners are also discussed. The louse and the pocket-size STM are discussed first. It is of significant historical importance but no longer popular today. The single-tube STM has a very simple mechanical structure, and still the basis of the most popular commercial STM and AFM. The Besocke-type or the beetles is very popular among builders of special-purpose STM due its immunity to temperature variation and vibration. For STM requiring superb stability, the walker and the kangaroo are the preferred design. The commercial nanostepper, the Inchworm, is described. It has been successfully used by many designers of special-purpose STM.
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Jones, Peter. « The causes of bleeding disorders ». Dans Living with Haemophilia, 49–70. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780192632296.003.0004.
Texte intégralRésumé :
Abstract The human body grows from a single cell, the fertilized ovum. At conception the union of the father’s sperm and the mother’s egg forms this cell. Within the cell lies the nucleus that governs all the functions of the cell. Packed within this first nucleus, a structure so small that it can on1y be seen through a microscope, is all the information needed for the control of the growth and development of the baby. This information has come from the child’s father and mother and, through them, from previous generations of the family. The nature of this information is explained Later in this chapter. When a single piece of the information is faulty, a bleeding disorder may result.
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Canul Soliis, Maricela Adelaida, Ángel Carmelo Sierra Vázquez, Julio Cesar Rodríguez Pérez, Alma Alejandra Santana Garma et Shirley Margarita Amaya Martin. « PARASITOSIS EN EL GUAJOLOTE CRIOLLO (MELEAGRIS GALLOPAVO) DE YUCATÁN : PARASITOS EN LOS GUAJOLOTES CRIOLLOS ». Dans Zootecnia : tópicos atuais em pesquisa, 181–95. Editora Científica Digital, 2023. http://dx.doi.org/10.37885/230312264.
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Objetivo: Identificar los géneros y especies de Mallophaga y nematodos gastrointestinales (NGI) presentes en guajolotes criollos en el estado de Yucatán. Métodos: Se muestrearon en comunidades rurales entre el año 2014 a 2020, animales machos y hembras mayores de un año de edad. Para la identificación de Mallophaga los guajolotes fueron inspeccionados de manera visual en diferentes áreas corporales (cabeza, cuello, ala, pechuga, pierna, espalda y cola). Los Mallophaga localizados se depositaron en viales con alcohol al 70% hasta ser transportados al laboratorio para su identificación, para identificar los NGI se obtuvieron 32 Intestinos y 120 muestras de heces fecales, ambas fueron analizadas en el laboratorio de usos múltiples del Instituto Tecnológico de Conkal, utilizando un estereoscopio y un microscopio con objetivos 10 y 40x. Resultados: La especie de Mallophagas con mayor frecuencia fue Chelopiste meleagridis (51.7%). El NGI que más prevaleció fue Ascaridia galli (43%). Conclusión: En el estado de Yucatán es el primer estudio en su tipo que se realiza en guajolotes criollos de traspatio. La región corporal que resulto más afectada fue la pierna, se recomienda continuar con el trabajo para evaluar el efecto en la producción.
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Coolen, A. C. C., R. Kühn et P. Sollich. « General introduction ». Dans Theory of Neural Information Processing Systems, 3–28. Oxford University PressOxford, 2005. http://dx.doi.org/10.1093/oso/9780198530237.003.0001.
Texte intégralRésumé :
Abstract 1.1 Principles of neural information processing The brain is a piece of hardware that performs quite sophisticated information processing tasks, using microscopic elements and operations which are fundamentally different from the ones on which present-day computers are based. The microscopic processors in the brain, the nerve cells or neurons (see Figure 1.1), are excitable brain cells which can be triggered to produce electrical pulses (spikes), by which they communicate with neighbouring cells. These neurons are rather noisy elements, which operate in parallel. They do not execute a fixed ‘program’ on a given set of ‘data’, but they communicate signals through relay stations (the synapses), located at the junctions where the output channel (axon) of one neuron meets an input channel (dendrite) or the cell body of another. The strengths of these relay stations, or synaptic efficaices, are continuously being updated, albeit slowly. The neurons of each given brain region are organized and wired in a specific network, the structure of which can vary from very regular (especially in regions responsible for pre-processing of sensory data) to almost amorphous (especially in the ‘higher’ regions of the brain, where cognitive functions are performed), see Figure 1.2. The dynamic relay stations, or synapses, in combination with some adjustable intrinsic neuron properties, represent both ‘data’ and ‘program’ of the network. Hence program and data change all the time.
Actes de conférences sur le sujet "Pierre – microscopie"
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Jones, Lewys. « Development of a User Adjustable Pole-piece Gap Objective-lens ». Dans European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.322.
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Huang, Huan, et Zhixiong Guo. « Ablation and Separation of Dermis via Ultra-Short Pulsed Laser ». Dans ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10403.
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Dermal tissue ablation and layer-separation with minimal thermal damage to the surrounding tissue via an ultra-short pulsed (USP) laser has been investigated. At first, a parametric study for wet tissue surface line ablation was investigated. The line features were measured by both microscope and scanning electron microscopy. The dermis ablation threshold and the incubation factor were determined through the line ablation results. It is found that a general microscope may give inflated ablation line width. Following the ablation experiment, histological view of ablated wet tissue samples with different combinations of laser parameters has been undertaken to obtain proper laser parameters for tissue separation with minimal thermal damage. The separation of a whole piece of wet dermal tissue into two thin layers was presented. A thin dermal tissue layer pushing to 220 μm thickness was obtained.
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« Progress update on the development of The User Adjustable Pole-piece ». Dans Microscience Microscopy Congress 2023 incorporating EMAG 2023. Royal Microscopical Society, 2023. http://dx.doi.org/10.22443/rms.mmc2023.170.
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Ohnishi, Ichiro. « Development of an ultrahigh resolution objective lens pole-piece with high analytical capability for aberration corrected 300 kV microscope ». Dans European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.461.
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Johnson, Peter K., María Arana, Koldo M. Ostolaza et Johan Bressers. « Crack Initiation in a Coated and an Uncoated Nickel-Base Superalloy Under TMF Conditions ». Dans ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-236.
Texte intégralRésumé :
A thermomechanical fatigue (TMF) cycle, intended to represent aero-engine blade working conditions, was selected for carrying out tests on uncoated and aluminide coated SRR99 samples until test piece failure. Optical images of the surface of test pieces were collected during testing to monitor surface crack initiation and accompanying transformations. Using these images, surface changes were quantified as a function of time. Post test, each sample was taken through an incremental polishing procedure to allow damage in the tested material to be studied as a function of depth, using optical microscope based quantitative metallography and scanning electron microscopy (SEM). The relationship between the observed surface changes and the damage built-up subsurface was examined. Differences in damage density on the surface and subsurface planes between coated and uncoated samples could accommodate the observed life reductions.
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Ma, Yong, Jincheng He, Yi Liu, Longliang Yang, Binzheng Liu, Xingye Zhou, Shixiong Liang et Zhihong Feng. « A Microscopic Deep UV Imaging System with a Single Detector ». Dans 2021 Photonics & Electromagnetics Research Symposium (PIERS). IEEE, 2021. http://dx.doi.org/10.1109/piers53385.2021.9694893.
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Zhanghao, Karl, Long Chen, Xusan Yang, Miaoyan Wang, Zhenli Jing, Hongbin Han, Michael Q. Zhang, Dayong Jin, Juntao Gao et Peng Xi. « Super-resolution fluorescence dipole orientation microscopy ». Dans 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7734948.
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Zhulei Xiang, Weijuan Qu, Shuaiyang Zhao, Zhaomin Wang, Guixia Guan, Xin Jing et Zhiguo Liu. « Phase compensation in Digital Holography Microscopy ». Dans 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7735433.
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Kuan-Ting Lin, Susumu Komiyama, Sunmi Kim, Ken-ichi Kawamura et Yusuke Kajihara. « Development of a cryogen-free passive near-field microscope ». Dans 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7735109.
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Biehs, Svend-Age, Alejandro W. Rodriguez, Konstantin Kloppstech, Nils Konne, Ludwig Worbes, David Hellmann et Achim Kittel. « Theoretical description of a near-field scanning thermal microscope ». Dans 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7735303.
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