Magnetization Processes
Mostrando 1-12 de 14 artigos, teses e dissertações.
-
1. MAGNETOMETRIA IN-SITU PARA CARACTERIZAÇÃO DE MATERIAIS ELETRODEPOSITADOS
We have recently made studies of electrodeposits of Co onto graphene attached to different substrates, successfully performed via in-situ magnetization measurements. The magnetic analysis of deposits as a function of time lapse, indicate that Co grows with different magnetic characteristics from the beginning to the end of each run, independent of the substr
Quím. Nova. Publicado em: 18/07/2019
-
2. Ruido magnético Barkhausen para el estudio de la anisotropía magnética en aceros inoxidables
ABSTRACT The magnetic Barkhausen noise (MBN) is a phenomenon that occurs in ferromagnetic materials when they are exposed to slowly varying magnetic fields, generating discrete jumps in their magnetization. These jumps are produced by the movement of the magnetic domain walls. They can be detected by a small coil allocated on the sample surface. The movement
Matéria (Rio J.). Publicado em: 19/07/2018
-
3. NANOBIOCATALYTIC SYSTEMS BASED ON LIPASE-Fe3O4 AND CONVENTIONAL SYSTEMS FOR ISONIAZID SYNTHESIS: A COMPARATIVE STUDY
Abstract Superparamagnetic nanomaterials have attracted interest in many areas due to the high saturation magnetization and surface area. For enzyme immobilization, these properties favor the enzyme-support contact during the immobilization reaction and easy separation from the reaction mixture by use of low-cost magnetic processes. Iron oxide magnetic nanop
Braz. J. Chem. Eng.. Publicado em: 2016-09
-
4. Interaction fields evaluation in fine particle systems
A computer simulation model for estimation of the interaction fields in fine particle systems has been developed. The method uses the experimental 8Mα(H) plot, constructed from the Fourier description of the initial magnetization curve and the hysteresis loop, and the 8M(H) plot, obtained from the remanence curves. The dependencies of the interaction fields
Publicado em: 2011
-
5. In vivo evaluation of cortical thickness with magnetic resonance imaging in patients with bipolar disorder
Changes in cortical thickness can be related to neuropsychiatric disorders and neurodegenerative processes. Previous studies have been conducted to characterize the pattern of changes in cortical thickness in several psychiatric diseases. The aim of the present study was to evaluate changes in cortical thickness with magnetic resonance imaging (MRI) in patie
Psychology & Neuroscience. Publicado em: 2009-12
-
6. Interação da matéria de vórtices com estruturas de defeitos : detecção das primeiras penetrações
This thesis results from a systematic study of the interactions between penetrated vortices and pinning centers carried out on structured superconductors films of YBCO, Nb and Pb. A regular array of pinning centers (antidots, ADs) was inserted in those samples by mechanical indentations (in YBCO and Nb films), and by a lithographic processes (Pb). The struct
Publicado em: 2009
-
7. Síntese, sinterização e caracterização de ferritas à base de Ni-Zn
Were synthesized different ferrites NixZn1-xFe2O4 (0,4 ≤ x ≤ 0,6) compositions by using citrate precursor method. Initially, the precursors citrates of iron, nickel and zinc were mixed and homogenized. The stoichiometric compositions were calcined at 350C without atmosphere control and the calcined powders were pressed in pellets and toroids. The
Publicado em: 2008
-
8. MAGNETIC CHITOSAN FOR REMOVAL OF URANIUM (VI) / Quitosana magnética para remoção de urânio (VI)
The chitosan, an aminopolysaccharide formed for repeated units of Dglucosamine, is a deacetylation product of chitin. It presents favorable ionic properties acting as chelant, being considered a removing ionic of contaminants from water effluents. It has ample bioactivity, that is, is biocompatible, biodegradable, bioadesive and biosorbent. The chitosan inte
Publicado em: 2007
-
9. Iron oxide based nanoparticles: synthesis and characterization / Síntese e caracterização de nanopartículas baseadas em óxidos de ferro
Magnetic nanoparticles have importance in several areas of knowledge including physics, chemistry and biology. Obtaining nanomaterials with well defined characteristic and shapes is a great challenge for this area of research. In this work two synthetic processes for the synthesis of the magnetic nanoparticles were developed, in reversed micelles and sol-gel
Publicado em: 2005
-
10. Estudo de mineralizações de tipo Cu-porfiro do sul do Peru por meio de sensoriamento remoto e aeromagnetometria
A large number of mineral deposits are known in the Andes, including Cu-porphyry deposits. Among these, Cuajone, Quellaveco and Toquepala are some of the most important in the southern portion of Peru. They are located in the domain ofthe Bolivian Orocline, within the Incapuquio shear zone, a structure that controls the mineralization, ofabout 60 Ma. Airborn
Publicado em: 2002
-
11. Transições de fase e propriedades magneticas de compostos R-T
In this work we studied intrinsic and extrinsic magnetic properties of rare earth-transition metals compounds. The intrinsic magnetic properties of R(Fe,M)12 intermetallic compounds was systematically investigated. Emphasis was given to the determination of magnetic phase transitions and magnetocrystalline anisotropy field. Measurements of the temperature de
Publicado em: 1995
-
12. Influencia das anisotropias magneticas nos processos de magnetização de ligas amorfas
Measurements of initial magnetic susceptibility and initial magnetic permeability aftereffect were performed in a set of amorphous metallic ribbons of nominal composition FexCo75-xSi15B10 (2 £ x £ 40). The observed behaviors for the susceptibility curves as a function of the external agents applied in the samples (tensile stresses, DC magnetic field, therm
Publicado em: 1992