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Journal articles on the topic 'Diffusion anisotropique'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Herrnberger, B. "Diffusionstensor-Magnetresonanztomographie." Nervenheilkunde 23, no. 01 (2004): 50–59. http://dx.doi.org/10.1055/s-0038-1626275.

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ZusammenfassungDiffusionstensor-Magnetresonanztomographie kombiniert die Messprinzipien von Magnetresonanztomographie und Diffusion. Sie charakterisiert die Diffusion von Wassermolekülen durch die Rekonstruktion von Diffusionstensoren, deren Eigenwerte (Hauptdiffusionsstärken) und Eigenvektoren (Hauptdiffusionsrichtungen) durch die Achsenlängen und Achsenrichtungen von Diffusionsellipsoiden veranschaulicht werden. Die Kenntnis der Diffusionsstärken erlaubt quantitative Aussagen zu Anisotropie und damit zur mikroskopischen Struktur von Gewebe, die Kenntnis der Diffusionsrichtungen das Verfolgen

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2

Čantrak, S., M. Benišek, M. Nedeljković, and M. Lečić. "Turbulenz-Anisotropie und nichtlokale Diffusion in drallbehafteter Scherströmung." PAMM 2, no. 1 (2003): 346–47. http://dx.doi.org/10.1002/pamm.200310157.

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3

Daoud, M., M. Gharbia, and A. Gharbi. "Anisotropie des coefficients de diffusion dans des cristaux liquides discotiques hexagonaux." Journal de Physique II 4, no. 6 (1994): 989–1000. http://dx.doi.org/10.1051/jp2:1994179.

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4

Schöller, Karsten, and Sebastian Siller. "DTI in der Diagnostik der zervikalen Myelopathie." Die Wirbelsäule 04, no. 04 (2020): 268–74. http://dx.doi.org/10.1055/a-1169-0990.

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ZusammenfassungDie degenerative zervikale Myelopathie (DCM) ist die häufigste Form der Rückenmarksaffektion im Erwachsenenalter. Die zugrundeliegenden pathophysiologischen Veränderungen sind komplex und eine operative Therapie ist in aller Regel spätestens dann notwendig, wenn relevante klinische Symptome einer stenosebedingten Rückenmarkskompression vorliegen. Für die Planung der Operation ist eine akkurate bildgebende Diagnostik essenziell. Diese soll dabei helfen, die zur klinischen Symptomatik beitragenden Wirbelsäulensegmente zu identifizieren.Die konventionelle Magnetresonanztomografie (

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5

Vomstein, Kilian, Bram Stieltjes, and Luise Poustka. "Strukturelle Konnektivität und Diffusionstensor-Bildgebung bei Autismus-Spektrum-Störungen." Zeitschrift für Kinder- und Jugendpsychiatrie und Psychotherapie 41, no. 1 (2013): 59–68. http://dx.doi.org/10.1024/1422-4917/a000210.

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Die Diffusions-Tensor-Bildgebung (DTI) erlangt seit mehreren Jahren in der Erforschung neuropsychiatrischer Krankheitsbilder einen immer höheren Stellenwert. Mit Hilfe dieser Technik können Faserverläufe in vivo dargestellt werden, was bisher anatomischen post-mortem Studien vorbehalten war. Auch bei der Untersuchung neurobiologisch-anatomischer Korrelate kinder- und jugendpsychiatrischer Störungsbilder wie den Autismus-Spektrum-Störungen gewinnt DTI zunehmend an Bedeutung. Die Interpretation dieser Bildgebungsdaten ist allerdings für wissenschaftlich interessierte Kliniker häufig nicht einfac

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6

Gill, A. S., and E. W. Laing. "Resistive evolution of a force-free plasma to equilibrium." Journal of Plasma Physics 46, no. 3 (1991): 437–57. http://dx.doi.org/10.1017/s0022377800016238.

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Using the magnetohydrodynamic model, the evolution of a resistive plasma can be represented as a relaxation through a sequence of force-free equilibrium states. We show, by extending existing work, that this process is equivalent to magnetic field diffusion in a strongly anisotropie static conductor. The latter evolution is easier to simulate numerically, and is carried out for laboratory based plasmas confined in cylinders and toroids. We obtain a variety of universal equilibrium profiles that are consistent with experiment and relaxation theory and that predict the existence of states arisin

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7

Moiseev, S. S., V. A. Petrov, and S. V. Stepanov. "Use of a radiation diffusion model for determination of optical and thermal radiative properties of anisotropie silica fiber thermal insulation." International Journal of Thermophysics 17, no. 2 (1996): 515–25. http://dx.doi.org/10.1007/bf01443408.

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8

Konopka, P. "Analytical Gaussian Solutions for Anisotropie Diffusion in a Linear Shear Flow." Journal of Non-Equilibrium Thermodynamics 20, no. 1 (1995). http://dx.doi.org/10.1515/jnet.1995.20.1.78.

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9

Baribeau, J. M., D. J. Lockwood, Z. H. Lu, and R. L. Headrickt. "Interface Phenomena in very thin Si-Ge Heterostructures." MRS Proceedings 317 (1993). http://dx.doi.org/10.1557/proc-317-77.

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ABSTRACTInterfacial properties of thin Si/Ge heterostructures are discussed. It is shown that (SimGen) p superlattices with well defined periodicity can be synthesized on both (100) Si and Ge using low temperature (350 °C) Molecular beam epitaxy. Multilayer structures are however intermixed over one or two monolayers and exhibit a roughness with lateral scale > 100 nm and an amplitude of the order of two Monolayers. On Si the roughness is strongly correlated from interface to interface, possibly due to small surface mobility during growth. Segregation of Ge during growth has also been evide

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10

Chu, W. H., M. Mehregany, X. Ning, and P. Pirouz. "Measurement of Residual Stress-Induced Bending Moment of P+ Silicon Films." MRS Proceedings 239 (1991). http://dx.doi.org/10.1557/proc-239-169.

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AbstractThis paper presents results from measurements of residual stress-induced bending moment of heavily-boron-doped (p+) silicon films. Microfabricated free-standing cantilever beams of p+ silicon were fabricated by using anisotropie etching of (100) silicon wafers in ethylene-diamine and pyrocatechol. The p+ etch stops forming the cantilevers were created by diffusion from a solid source at 1125°C for one and two hour time durations. The nonuniform residual stress distribution through the thickness of the p+ silicon cantilevers resulted in a deflection of the beams. The as-diffused p+ sili

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11

Kanzaki, Masami, Akihiko Yamaji, and Kazuya Kawakami. "Molecular Dynamic Simulation and Electrical Properties of Ba2In2O5." MRS Proceedings 496 (1997). http://dx.doi.org/10.1557/proc-496-193.

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ABSTRACTBrownmillerite(Ca2Al2O5-Ca2Fe2O5 solid solution) structure can be regarded as an oxygen-ion deficient perovskite structure. Because of high proportion of the oxygen vacancies in the structure, this material could be a candidate of fast oxide-ion conductor. Goodenough et al. indeed observed a first-order transition to a fast oxide-ion conductor at 930° C for Ba2In2O5 which adapts brownmillerite structure at ambient temperature. Molecular dynamics simulation was employed to study oxygen ion diffusion and phase transition of Ba2In2O5. The structure was well simulated at 300 K. When the sy

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12

Leiberich, A., and P. K. Roy. "Crystallite Dimensions and Strain in Poly-Si and Ti-Silicide Thin Films Measured with Grazing Incidence X-Ray Diffraction." MRS Proceedings 239 (1991). http://dx.doi.org/10.1557/proc-239-87.

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ABSTRACTThe present study describes the measurement of microcrystalline grain dimensions and crystallite strain for polycrystalline silicon (poly-Si) and titanium suicide, using grazing incidence X-ray diffraction (GIXRD). A variety of poly-Si sample configurations were synthesized by different low pressure chemical vapor deposition (LPCVD) processing techniques. Selected samples were subsequently processed by phosphorous diffusion doping and reaction with thin titanium layers. Characterization with GIXRD reveals differing crystallite grain dimensions, ranging from =80Å to =900Å. Crystal strai

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13

Herweh, C., J. Sellner, T. Wilhelm, U. Meyding-Lamadé, S. Heiland, and M. Hartmann. "Diffusion Tensor Imaging zur Bestimmung der temporalen Anisotropie und Diffusivität bei akuter Herpes-simplex-Virus-Enzephalitis." Aktuelle Neurologie 31, S 1 (2004). http://dx.doi.org/10.1055/s-2004-833416.

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14

Dobisz, E. A., B. Tell, H. G. Craighead, S. A. Schwarz, M. C. Tamargo, and J. P. Harbison. "Effects of Implant Temperature on Disordering of AlAs-GaAs Superlattices." MRS Proceedings 77 (1986). http://dx.doi.org/10.1557/proc-77-423.

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ABSTRACTThe effect of implant temperature, superlattice period, and directional diffusion has been studied for silicon impurity-enhanced compositional disordering of GaAs-AlAs superlattices (SL) of 9 ran and 16 nm period. The SL were implanted with Si at temperatures of 483 K, 293 K, and 77 K, with an energy of 100 keV and dose of 2.5 × 1014 cm-2. These were examined by cross-sectional transmission electron microscopy and secondary ion mass spectro-scopy for structural and compositional information. The damage due to implantation prior to annealing is strikingly less for superlattices than for

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15

Kallenberg, K., T. Goldmann, HC Bock, et al. "Erleichterte Diffusion und reduzierte Anisotropie in der Großhirnhemisphäre kontralateral zur Tumorlokalisation bei Patienten mit Glioblastom oder anaplastischem Astrozytom." RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren 182, S 01 (2010). http://dx.doi.org/10.1055/s-0030-1252582.

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16

Werner, Michael J., and Ray J. King. "Moisture Measurement of Composites." MRS Proceedings 347 (1994). http://dx.doi.org/10.1557/proc-347-253.

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ABSTRACTOpen reflection microwave resonator sensors have been developed for in situ measurement of the bulk moisture absorbed by nonconducting fiber-reinforced composites. These contacting sensors operate at about 4 GHz, and have sensitivities and resolutions of about 0.1% moisture. In application, two independent parameters are measured simultaneously. From these, the two components of the effective complex dielectric constant ε* (ε′= - јε″) as seen by the sensor are determined. Both ε′ and ε″ are highly linear with absorbed moisture.Both linearly polarized sensors (for measuring anisotropie

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