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Relevant bibliographies by topics / Anisotopy

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Journal articles

Academic literature on the topic 'Anisotopy'

Author: Grafiati

Published: 4 May 2024

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Journal articles on the topic "Anisotopy"

1

Engelhorn, Tobias, Georg Michelson, Simone Waerntges, et al. "Changes of Radial Diffusivity and Fractional Anisotopy in the Optic Nerve and Optic Radiation of Glaucoma Patients." Scientific World Journal 2012 (2012): 1–5. http://dx.doi.org/10.1100/2012/849632.

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Purpose of this study was to evaluate with diffusion-tensor imaging (DTI) changes of radial diffusivity (RD) and fractional anisotropy (FA) in the optic nerve (ON) and optic radiation (OR) in glaucoma and to determine whether changes in RD and FA correlate with disease severity. Therefore, glaucoma patients and controls were examined using 3T. Regions of interest were positioned on RD and FA maps, and mean values were calculated for ON and OR and correlated with optic nerve atrophy and reduced spatial-temporal contrast sensitivity (STCS) of the retina. We found, that RD in glaucoma patients was significantly higher in the ON (0.74 ± 0.21 versus 0.58 ± 0.17⋅10−3 mm2 s−1;P<0.05) and OR (0.79 ± 0.23 versus 0.62 ± 0.14⋅10−3 mm2 s−1;P<0.05) compared to controls. Aside, FA was significantly decreased (0.48 ± 0.15 versus 0.66 ± 0.12 and 0.50 ± 0.20 versus 0.66 ± 0.11;P<0.05). Hereby, correlation between changes in RD/FA and optic nerve atrophy/STCS was observed (r>0.77). In conclusion, DTI at 3 Tesla allows robust RD and FA measurements in the ON and OR. Hereby, the extent of RD increase and FA decrease in glaucoma correlate with established ophthalmological examinations.

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2

Yu, R., X. F. Zhang, L. L. He, and H. Q. Ye. "Topology of charge density and elastic anisotropy of Ti3SiC2 polymorphs." Journal of Materials Research 20, no. 5 (2005): 1180–85. http://dx.doi.org/10.1557/jmr.2005.0145.

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Using an all-electron, full potential first-principles method, we have investigated the topology of charge density and elastic anisotropy of Ti3SiC2 polymorphs comparatively. By analyzing the charge density topology, it was found that the Ti–Si bonds are weaker in β than in α, resulting in a destabilizing effect and lower Young’s modulus in directions between a and c axes for β. On the other hand, the Si–C bonds (absent in α) are formed in β in the c direction. The formation of the Si–C bonds not only mitigates the destabilizing effect of the weaker Ti–Si bonds, but also results in larger Young’s modulus in the c direction. In contrast to the high elastic anisotrophy, the elastic anisotropy of Ti3SiC2 is very low.

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3

Peregudov, Dmitriy, Anatoly Soloviev, Igor Yashin, and Victor Shutenko. "GALACTIC COSMIC RAY ANISOTROPY MODELLING." Solar-Terrestrial Physics 6, no. 1 (2020): 29–34. http://dx.doi.org/10.12737/stp-61202003.

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We calculate the angular distribution of cosmic rays at a given point of the heliosphere under the assumption that the incoming flux from outer space is isotropic. The static magnetic field is shown to cause no anisotropy provided that the observation point is situated out of the trapped particle area. We consider a coronal ejection model in the form of a static cylinder with an axial homogeneous magnetic field inside. We calculate angular distribution samples in the trapped particle area (inside the cylinder) and show that there is a certain cone of directions with a reduced flux. For the same model with the moving cylinder, the angular distribution samples are calculated for different positions of the observation point outside the cylinder. Anisotropy of order of the ejection to light velocity ratio is shown to arise. The calculated samples are in qualitative agreement with URAGAN muon hodoscope data.

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4

Byun, Joongmoo. "Automatic Velocity Analysis Considering Anisotropy." Journal of the Korean Society of Mineral and Energy Resources Engineers 50, no. 1 (2013): 11. http://dx.doi.org/10.12972/ksmer.2013.50.1.011.

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5

Yurov, V. M. "ANISOTROPY OF THE SURFACE OF CARBON MATERIALS." Eurasian Physical Technical Journal 18, no. 3 (37) (2021): 15–24. http://dx.doi.org/10.31489/2021no3/15-24.

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In this work, a model of the surface layer of perfect single crystals is used and the role of surface energy in physical processes occurring in the region of nanosized carbon materials is clarified. Of these, diamond, graphite, carbyne and fullerenes have been investigated. The thickness of the surface layer of diamond with cubic symmetry is 8.2 nm and is a nanostructure. The average size of the synthesized nanodiamond is of the order of ~ 8 nm. The value of the surface energy σhkl calculated by us along the diamond planes (100), (110), and (111) is in good agreement with experiment and other calculations. The thickness of the surface layer of graphite along the a axis is equal to R(I)a = 8.0 nm and also represents a nanostructure. But along the c axis we have a layer thickness of about 1.5 nm and the number of monolayers is only 2. On this c axis, graphite can be created a monolayer by turning it into graphene. The σhkl value calculated by us along the a and c planes of graphite is 25957 and 5515 mJ/m2 , respectively. Carbines represent a polymeric polyyne or cumulene chain composed of sp-hybridized carbon atoms. If we imagine that the thickness of the surface layer of carbyne is stretched into a one-dimensional chain along the c axis, then the length of this chain is up to 200 nm for α-carbyne. The thickness of the surface layer of fullerenes significantly exceeds the thickness of the surface layer of pure metals. The surface energy of fullerenes σhkl increases with an increase in the number of carbon atoms С36 → С96. It also changes in the series (111) → (100) → (110).

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6

Shimada, Hikaru, Ayumi Kiyama, Panitha Phulkerd, and Masayuki Yamaguchi. "Anomalous Optical Anisotropy of Oriented Cellulose Triacetate Film." Nihon Reoroji Gakkaishi 45, no. 1 (2016): 19–24. http://dx.doi.org/10.1678/rheology.45.19.

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7

Rongkonusa, Melisa, Gerald Tamuntuan, and Guntur Pasau. "Analisis Anisotropi Suseptibilitas Magnetik Batuan Beku Lengan Utara Sulawesi." Jurnal MIPA 6, no. 1 (2017): 8. http://dx.doi.org/10.35799/jm.6.1.2017.15846.

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Telah dilakukan penelitian untuk menentukan pola anisotropi suseptibilitas magnetik dan status singkapan batuan beku dari pola yang diperoleh. Pengukuran anisotropi suseptibilitas magnetic dilakukan pada lima sampel batuan beku dari Sulawesi Utara menggunakan Bartington MS2B. Arah pengukuran sampel disesuaikan dengan desain Tauxe. Hasilnya menunjukkan bahwa suseptibilitas maksimum terdistribusi disekitar arah utara dan timur. Sedangkan suseptibilitas intermediet dan minimum terdistribusi disekitar Utara-Timur dan Timur-Selatan. Elipsoida suseptibilitas cenderung prolate atau lebih lonjong. Batuan beku yang dianalisis merupakan kelompok batuan terobosan yang mekanisme lelehannya terjadi secara vertikal.A research has been conducted to determine the anisotropic pattern of magnetic susceptibility and the status of igneous rocks exposure from the obtained pattern. We have measured the anisotropy of magnetic susceptibility on five samples of igneous rock from North Sulawesi by Bartington MS2B. The position of samples were adjusted according to the Tauxe’s design. The result shows that the maximum susceptibility is distributed around northward and eastward, while the intermediate and minimum susceptibility are distributed around nortward-eastward and eastward-southward. The susceptibility ellipsoid tends to be prolate or more oval. This shows that the igneous rocks that have been analyzed are group of intrusive rocks which melting mechanism occurs through vertical fracture.enetie

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8

Pranowo, Waskito, and Sonny Winardhi. "Application of Velocity Variation with Angle (VVA) Method on an Anisotropic Model with Thomsen Delta Anisotropy Parameters." Jurnal Geofisika 16, no. 2 (2018): 6. http://dx.doi.org/10.36435/jgf.v16i2.371.

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Anisotropic properties will influence seismic propagation, for example it will affect wave velocity. One of well-known anisotropi equation for Transversaly Isotropic media is weak anisotropy with Thomsen's notation. Supriyono [2011] tried to estimate all of these variables by using velocity variation with angle (VVA) attribute. This research uses synthetic data, which is CMP Gather to know limitations of VVA attribute, to identify the error values, and to determine the best indicator of anisotropic eect. This research also uses another analysis method, which is grid search inversion to estimate VP0. From this research, Both VVA and grid search invesion still produce signcant error. The effects which will appear because of anisotropic property's presence are hockey-stick and over NMO-stretching.

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9

Maki, Yasuyuki, Hideki Okamura, and Toshiaki Dobashi. "Optical Anisotropy and Molecular Orientation of Neutralized Curdlan Gels." Nihon Reoroji Gakkaishi 45, no. 1 (2016): 65–69. http://dx.doi.org/10.1678/rheology.45.65.

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10

Danian, Shi, Dong Yingjun, Jiang Mei, et al. "Shear wave anisotropy beneath the Qinghai and Tibetan Plateau." Global Tectonics and Metallogeny 7, no. 1 (1999): 15–24. http://dx.doi.org/10.1127/gtm/7/1999/15.

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