Interlaboratory comparison on 137Cs activity concentration in fume dust

Proceeding of the 9th International Topical Meeting on Industrial Radiation and Radioisotope Measurement Applications, 6-7 July 2014, Valencia, Spain.; International audience; A comparison was conducted, between 11 European National Metrology Institutes and EC-JRC, on measurement of Cs-137 activity concentration in fume dust. As test material an activity standard produced from real contaminated fume dust was used. The standard material consisted of 13 cylindrical samples of compressed fume dust. The material contained Cs-137 and Co-60 of reference activity concentrations of (9.72 +/- 0.10) Bq/g and (0.450 +/- 0.018) Bq/g, respectively, for the reference date of 1 June 2013, determined using the comparison results. The organization and results of the intercomparison, as well as the process of obtaining reliable reference values are presented

60Co in Cast Steel Matrix: a European Interlaboratory Comparison for the Characterisation of New Activity Standards for Calibration of Gamma-ray Spectrometers in Metallurgy

International audience; Two series of activity standards of Co-60 in cast steel matrix, developed for the calibration of gamma-ray spectrometry systems in the metallurgical sector, were characterised using a European interlaboratory comparison among twelve National Metrology Institutes and one international organisation. The first standard, consisting of 14 disc shaped samples, was cast from steel contaminated during production ("originally"), and the second, consisting of 15 similar discs, from artificially-contaminated ("spiked") steel. The reference activity concentrations of Co-60 in the cast steel standards were (1.077 +/- 0.019) Bq g(-1) on 1 January 2013 12h00 UT and (1.483 +/- 0.022) Bq g(-1) on 1 June 2013 12h00 UT, respectively

Fitness machine for disabled people for strengthening arms

Úvod této práce je zaměřen na rešerši posilovacích strojů pro postižené i jejich samotné výrobce. Na základě poznatků získaných během konzultací byla sestavena specifikace požadavků kladených na daný technický systém. Práce se dále zabývá vlastním návrhem a popisem součástí stroje, doplněnými o ověřovací a simulační výpočty.Katedra konstruování strojůObhájenoThe diploma work is focused on the background of the fitness machines for disabled people and their producers. Based on the knowledge gained during the consultation the specification of requirements for the technical system was prepared. The diploma work also deals with the design and description of the machine components, attached with verification and simulation of calculations

Study of formation of 3,4-dihydro-benz[e]oxazin-2-on and 3H-benzoxazol-2-on from carbamates

Práce popisuje kinetiku a mechanismus alkalické hydrolýzy fenyl-N-(2-hydroxyfenyl)karbamatů a fenyl-N-(2-hydroxybenzyl)karbamatů.Dokončená práce s úspěšnou obhajobo

PTRAC File Utilization for Calculation of Free-Air Ionization Chamber Correction Factors by MCNPX

A free-air ionization chamber is used as a standard of photon air-kerma. Several correction factors are applied to the air-kerma value. Correction factors for electron loss (kloss) and for additional ionization current caused by photon scatter (ksc), photon fluorescence (kfl), photon transmission through diaphragm edge (kdtr), and photon scatter from the surface of the diaphragm aperture (kdsc) were determined by the MCNPX code utilizing information stored in Particle Track (PTRAC) output files. Individual steps of the procedure are described and the calculated values of the correction factors are presented. The values are in agreement with the correction factors published in a literature for similar free-air chambers

Quality of Services in Transport Company Jihotrans

Customers of transport company Jihotrans values in the survey five basic factors for the quality of its services. In total, these evaluations define a variable overall quality of services. In the article is first performed a descriptive analysis of this variable. Using basic statistical methods, the significant dependence of the overall quality of services provided by some other qualitative and quantitative variables included in the questionnaire was then explored. In addition to analysis of variance there were used models of correlation and regression analysis, including models with dummy variables. Using analysis of variance, it was shown that the overall quality of service depends considerably on the competitive advantages of the company. It was also derived linear regression model dependence of this variable on the evaluation of the development of enterprise competitiveness. As the best model, was derived regression model which expresses the dependence of overall service quality on a pair of variables assessment of the development of enterprise competitiveness and competitive advantage for enterprises. This model was described computationally and also was presented graphically

Mathematical modeling of chemical deliming and simulation of economical parameters in gelatin production

The paper deals with optimization of the calcimine deliming process during production of food grade gelatin. This process is the most important step from chemical engineering and environmental protection standpoint during production of food gelatin. The main objective of the paper is to provide a suitable mathematical description of the chemical deliming process. The proposed model is subsequently used for optimization of the deliming process to minimize the operating costs and environmental burden. The experimental part follows two main aims: determination of the effective diffusion coefficient of calcium sulfate during deliming with ammonium sulfate based on experimentally measured data, and computer simulations of the operating costs from the viewpoint of various soaking numbers, degree of the deliming and strength of the bond of calcium hydroxide to collagen. The results give ground for further optimization and exact transfer of laboratory data into real industrial operations

Mathematical simulation for optimization of tanning processes; deliming of white hide

In this paper, the authors show the usefulness of theoretical tools of chemical engineering in natural polymer processing, namely on the example of white hide deliming. White hide is a consequent product in the processes in which raw hide is transformed into leather. It is produced in the de-hairing stage which follows the soaking operation. For next operation, tanning, it is necessary to remove calcium hydroxide from white hide. Mathematical descriptions of both non-chemical and chemical deliming are presented, concentration fields of the reacting chemicals described and the importance of the acido-basic boundary inside the white hide shown. Experimental determination of the effective diffusion coefficient is also included. The presented mathematical models can serve as a very good basis for rationalization of the deliming process, save considerable amounts of energies, deliming chemicals and technological water, and make the whole process more environmentally friendly

Advancing traceability in medical X-ray imaging dosimetry within the TraMeXI Project: Introduction of AutoSpectr Software for automated computation of X-ray spectra and their parameters

International conference on radiation applications in Physics, Chemistry, Biology, Medical Sciences, Engineering and Environmental Sciences; 10-12 June, 2024, University of Granada, Spain