A5036942568- Magnetic Properties of Alloys
- Magnetic properties of thin films
- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Applications
- Metal and Thin Film Mechanics
- Metallurgical and Alloy Processes
- Rare-earth and actinide compounds
- Hepatitis B Virus Studies
- Congenital Diaphragmatic Hernia Studies
- Magnetic Field Sensors Techniques
- Nuclear Materials and Properties
- Hepatitis Viruses Studies and Epidemiology
- Neonatal Respiratory Health Research
- Respiratory viral infections research
- Metallurgical Processes and Thermodynamics
- Thermodynamic and Structural Properties of Metals and Alloys
- Magneto-Optical Properties and Applications
- HIV, Drug Use, Sexual Risk
- Inorganic Chemistry and Materials
- Vaccine Coverage and Hesitancy
- Advanced Materials Characterization Techniques
- Superconducting Materials and Applications
- Metal Alloys Wear and Properties
- Microstructure and Mechanical Properties of Steels
- Blood donation and transfusion practices
Universidade Estadual de Campinas (UNICAMP)
1995-2021
Pontifícia Universidade Católica do Paraná
2006
The effects of alloy composition and heat treatment on the intrinsic coercivity Hci SmCo5 magnets were studied. Alloys having six chemical compositions near that stoichiometric used to produce via usual powder metallurgy techniques. Magnets either as sintered (1150 °C) or treated at 850 °C. substantial increase in due °C occurs reversibly with a negligible change lattice parameters, Curie temperature Tc anisotropy field HA. Quantitative metallography thermomagnetic measurements showed...
We studied the high temperature decomposition mechanism for Fe/sub 17/Sm/sub 2/N phase using several different experimental techniques, as thermomagnetic and thermogravimetric analyses. Our results show that occurs in a two step scheme. In first reaction we hare formation of SmN solid solution nitrogen iron. second step, this degases, observe evolution over broad range.
An enhancement of the Curie temperature, T/sub c/, was deduced from ac-susceptibility measurements on R/sub 2/Fe/sub 14/B (R=Nd and Pr) phase for exchange coupled nanocrystalline magnets with respect to corresponding microcrystalline magnets.
We describe the construction of a thermomagnetic analyser that uses microfurnace. The equipment can work in temperature range -30/spl deg/C up to 1000/spl deg/C, with heating/cooling rates as high 50/spl deg/C/min. without hysteresis. design allows use excitation and pick-up coils thousands turns, working at room temperature. This gives sensitivity revealed by measurement magnetic transitions thin films masses order 500 /spl mu/g. reproducibility measurements is very good, there only...
Objective: To determine the prevalence of recurrent wheezing (RW) in preterm infants who received prophylaxis against severe infection with respiratory syncytial virus (RSV) and to identify genetic susceptibility (atopy or asthma) risk factors for RW. Methods: This was a cross-sectional study involving palivizumab at referral center Brazil during first two years age. A structured questionnaire administered face-to-face interview parents legal guardians. Results: The included 410 (median age...
The results of oxygen absorption in temperatures ranging from 200 to 500 °C are reported for the phases Fe17R2, R=Pr and Sm. It was observed that saturation limit is temperature dependent, being 3 at/fu at °C, 12.8 300 20.3 400 28.5 °C. This implies above phase deeply altered by absorption. Samples with were studied as prepared heat treated °C/40 h. show heat-treated samples consist Fe, R2O3. Metallographic examination, susceptibility, Mössbauer spectroscopy data support hypothesis...
The results of oxygen absorption in temperatures ranging from 200 to 500/spl deg/C are reported. It was observed that the saturation limit is temperature dependent, being 3 atoms per formula unit (at/fu) at 200/spl deg/C, 12.8 at/fu 300/spl 20.3 400/spl and 28.5 deg/C. This implies above phase deeply altered by absorption. Samples with were studied as prepared heat treated deg/C/40 h. show samples consist Fe/sub 17/Sm/sub 2/, Fe Sm/sub 2/O/sub 3/. Metallographic examination susceptibility...