Authors:C. Sikalidis, T. Zorba, K. Chrissafis, and K.M. Paraskevopoulos
Phase changes of iron containing solid wastes from steel mill pickling
lines after thermal treatments were investigated aiming the determination
of the appropriate conditions for its transformation to be useful for industrial
raw materials. Above 275°C, the thermally treated wastes contain a mixture
of α-Fe2O3 (hematite)
and γ-Fe2O3 (maghemite)
in different proportions, depending on the maximum heating temperature of
the thermal treatment. Increasing the maximum temperature the maghemite participation
is decreased through its transformation to hematite. Above 850°C hematite
is the main constituent, suggesting that thermal treatment of the wastes in
this temperature will give a product that could be used as red iron pigment.
Authors:A. Ould-Abbas, M. Bouchaour, D. Trari, and N. E. Chabane Sari
steps of heat treatments of PS at different atmospheres: — First, PS is annealed in hydrogen at the temperature of 450° C for 15 min to desorb the porous silicon, then we change the temperature at 950° C and we let it for 2 h to simulate the step of
Authors:M. Kweon, L. Haynes, L. Slade, and H. Levine
Thermal analysis was used to deduce the mechanism of resistance to enzymatic digestion by starches and to account for the extent of resistance at different enzymolysis reaction temperatures. Thermalanalysis was also used to determine the most productive treatment temperature for exploration of the effects of heat-moisture treatment of starches on their subsequent chemical and physical behavior, including enzyme digestibility. The starches were selected according to an experimental design based on a nontraditional description of genetically varied corn starches. As a result, each functional response to heat moisture treatments of the starches adjusted to different moisture contents could be assigned to the relevant causative structural factor in the experimental design.
The effect of various temperature treatments on TL response characteristics of CaSO4: Dy has been investigated for its reusability when the phosphor has been previously irradiated to increasingly higher gamma doses. In practice, annealing at a standard temperature, namely 400 °C, usually precedes the use or reuse of the phosphor. However, the study demonstrates that the phosphor with a previous history of high accumulated doses does not completely retain its original TL response characteristics with 400 °C treatment unless the phosphor is treated at an elevated temperature, namely 650 °C.
Authors:G. Weber, D. David, L. Quaglia, J. Pauwels, and J. Vanaudenhove
Surface treatment on non-ferrous metals are proposed in order to minimize or determine quantitatively the interference of
gaseous contamination. These proposals result from a large number of determinations of superficial contamination on several
materials using microanalysis by nuclear reactions. This work is included in a larger program which aims the certification
of standard materials in their oxygen, nitrogen and carbon contents.
Authors:Marcela Soares, Juliana Mattos, Priscila Pujatti, Alexandre Leal, Wagner dos Santos, and Raquel dos Santos
The proposal of this work was to investigate the effect of the radioactive (NH3)2PtCl2, cis-diamminedichloroplatinum (II) or CDDP* on malignant glioma cells and verify if the low-dose continuous internal radio-chemotherapy
would be able to produce additive effects. The antitumoral activity of CDDP* and the non labeled cisplatin, CDDP, were evaluated
in glioblastoma. Cisplatin was cytotoxic for glioblastoma cells in a dose dependent manner. Treatment with CDDP*, (IC50 = 1.75 ± 0.07 μM), proved to be more potent than using just CDDP, (IC50 = 4.96 ± 0.40 μM). These results suggest that cisplatin is a very potent radiosensitizer evoking a supra additive effect.
Internal radio-chemotherapy treatment based on CDDP* may be useful alternative to reduce the drug concentration required for
effective inhibition of glioblastoma growth.
Authors:Julen Ibarretxe, Gabriël Groeninckx, and Vincent B. F. Mathot
difference in crystallinity ( dashed line ), final result after correction ( dashed-dotted line ), and zero level indicator ( dotted line )
Figure 9 presents the results of the same treatment applied to
In-vivo neutron activation analysis (IVNAA) has been used in this laboratory, approximately for the past twenty years, to determine the bone status of humans. For this purpose, the total body calcium (TBCa) is assayed and that is indicative of the bone mineral concentration of the individual. We have effectively used this method to diagnose, understand and monitor the treatment of osteoporosis among elderly women, particularly in post-menopausal women. This paper summarizes the technique and our experience in dealing with osteoporosis.
A locally produced mordenite type synthetic zeolite and its modified form obtained by the treatment with dilute hydrochloric
acid were tested for their cesium uptake characteristics. The two zeolites were compared with other commercially available
synthetic zeolites with respect to their ability to sorb radiocesium from dilute nitric acid solution. The effects of the
changes in the composition of the solution including the concentration of nitric acid, sodium and cesium on the uptake of
cesium were investigated. The results can be used in the removing processor radiocesium from different types of nuclear plant
effluents by these zeolites.