Search Results

You are looking at 1 - 3 of 3 items for :

  • Author or Editor: I. Fazekas x
  • Chemistry and Chemical Engineering x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

The regional distribution of copper and other trace elements was determined in the brain of a patient deceased in Wilson's disease against a control brain. The heterogeneous distribution of copper was checked by scanning electron microscope equipped with an X-ray microanalyzer.

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: J. Bajdik, K. Pintye-Hódi, G. Regdon, P. Fazekas, P. Szabó-Révész, and I. Erős

Abstract  

Eudragit NE 30 D aqueous dispersion is a commonly used coating material, which contains methacrylate copolymers as film-forming agent and nonoxynol 100 as an endogenous emulsifier. The dissolution of the active ingredient from Eudragit NE-coated samples during storage is known to undergo a change. The crystallization of the emulsifier agent can play an important role in this. This polymer is not soluble in the gastrointestinal tract, but is permeable. Various parameters can influence the permeability of this film, e.g. via the tensile properties of the film. Change in the film thickness can cause the stretching of the film on a solid surface. Alterations in this physical parameter of the film were measured and the effects of different storage conditions were evaluated. The free film was prepared by spraying onto teflon. The crystallization of nonoxynol was followed via the changes in the DSC curve of the free film. A relationship was found between the film thickness and the crystallization of nonoxynol. It was established that the different storage conditions influence these changes. The temperature and the air humidity are important in this phenomenon. Lengthening of the storage time increased the difference in film thickness and crystallisation of emulsifier.

Restricted access
Journal of Radioanalytical and Nuclear Chemistry
Authors: G. Molnár, T. Belgya, L. Dabolczi, B. Fazekas, Zs. Révay, Á. Veres, I. Bikit, Z. Kiss, and J. Östör

Abstract  

Prompt gamma-activation analysis (PGAA) is an important complementary technique to conventional instrumental activation analysis that can be successfully used in a number of cases when INAA is not applicable. Therefore, a PGAA facility has been constructed at the recently refurbished and upgraded Budapest Research Reactor. It occupies the end position of a new curved themal guide of 30 m length and 2.5×10 cm2 cross section which provides a clean beam of low energy neutrons. The sophisticated HPGe-BGO -ray spectrometer system can be operated in Compton-suppression and pair-spectrometer modes simultaneously. The octal splitting of the main BGO improves efficient pair mode operation when coincidences between pairs of opposite segments and the HPGe detector are required separately. Gamma-gamma coincidence measurements will also be possible when the new multiparameter data acquisition system is completed. One of the main tasks at the new facility will be the accumulation of new spectroscopic data for detector calibration and standardisation, as well as for the construction of a more accurate prompt -ray library for the chemical elements. Various applications are planned, such as the determination of hydrogen in fullerenes and of toxic trace elements in environmental samples.

Restricted access