Diamagnetism
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Paramagnetic shimming for high-field MRI
The diamagnetism of biological tissues reduces the homogeneity of the magnetic field and may limit the number of samples in multi-sample gradient-recalled echo (GRE) experiments. This study aims to 1) evaluate the magnetic field distortions and signal loss artifacts in GRE images of proximal water samples, and 2) develop a passive shimming device to overcome
Brazilian Journal of Physics. Publicado em: 2009-06
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2. Relationship between viscosity and conductivity for tokamak plasmas
The relation between parallel viscosity and the parallel conductivity for tokamak plasma has been derived by combining Ideal MHD equilibrium equations with the concept of universal profiles. It is obtained that the parallel viscosity Π║ and parallel conductivity σ║ in a tokamak are related by Π║σ║-1 = γ (U-U0)I/R, where U is the loop voltage, U0
Brazilian Journal of Physics. Publicado em: 2009-03
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3. Diamagnetism and structural transition in the Ba2Cu3O4Cl2 compound
This work presents a study of structural and magnetic properties of the Ba2Cu3O4Cl2 (Ba2342) compound. Doped samples with K or Sr in the Ba site and Zn or Mg in the Cu site of the Ba2342 were prepared using a solid state diffusion method. They were characterized by X-ray powder diffractometry, scanning electron microscopy and dc-magnetization. Samples with B
Brazilian Journal of Physics. Publicado em: 2002-09
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4. Estudos de relaxação magnetica em supercondutores do tipo - II
We present in this work a study of magnetic relaxation in superconducting Y1Ba2CU3O7-d samples. We have used a single crystal grown in zirconia crucible, with Tc ~ 90 K and D T ~ 2 K; and a directionally solidified MTG sample with 17 % of Y211, Tc ~ 91 K and .D T ~ 2 K for H = 10 Oe. We discuss in a simplified manner the most relevant aspects of the magnetic
Publicado em: 2001
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5. "Um biossusceptômetro supercondutor AC para quantificar o ferro hepático". / A Superconductor AC Susceptometer to Quantify Liver Iron.
This work consisted in the development of a system to measure the magnetization of large paramagnetic and diamagnetic samples. The main application was susceptometric measurements of the hepatic tissue for quantification of the iron overload. Iron excess is commonly observed in thalassemic and sickle cell anemia patients who have repeatedly received red bloo
Publicado em: 2001
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6. THE MEAN SQUARE ANGULAR MOMENTUM AND DIAMAGNETISM OF THE NORMAL HYDROGEN MOLECULE
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7. Stable magnetic field gradient levitation of Xenopus laevis: toward low-gravity simulation.
We have levitated, for the first time, living biological specimens, embryos of the frog Xenopus laevis, using a large inhomogeneous magnetic field. The magnetic field/field gradient product required for levitation was 1430 kG2/cm, consistent with the embryo's susceptibility being dominated by the diamagnetism of water and protein. We show that unlike any oth