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Our country has a great importance in the world market in terms of the production of metal raw materials and end products, especially in the iron and steel industry. In order to realize an efficient and high quality production process, it is necessary to continuously monitor the Carbon (C) and Sulfur (S) concentrations of the material throughout the entire production process. During the marketing phase of the products in question, the material qualities must be reported by the conformity assessment bodies. At this stage, it is expected to increase the accuracy and reliability of the measurement results in the quality control tests of the products. For this purpose, the verification and validation of the analysis method which were employed should be carried out by the conformity assessment bodies. However, it is observed that there are different applications that fall outside the procedures described in the relevant international guidelines. In this study as an example to the best available techniques, method validation and uncertainty estimation studies were carried out for the total carbon (C) and total sulfur (S) analyses in metals and alloys following the procedures described in the standard of "General Requirements for the Competence of Test and Calibration Laboratories". [ABSTRACT FROM AUTHOR]

The structural, elastic, electronic and vibrational properties of Co3Al and Co3Ta alloys with density functional theory have been investigated. The lattice constants, bulk modulus and its pressure derivative are evaluated and compared with the available data. The numerical first principles calculations of the elastic constants were used to calculate C11, C12 and C44 for Co3Al and Co3Ta alloys. The electronic band structure, electronic total and partial densities of states, and total magnetic moment of the Co3Al and Co3Ta alloys are computed and analyzed in comparison with the existing findings. From the electronic calculations made for both alloys, it was found that the alloys were metallic in nature. Phonon-dispersion curves and their corresponding total and projected densities of states have been obtained for the first time using a linearresponse in the framework of the density functional perturbation theory. The frequencies of the optical phonon modes of both alloys are calculated and found to be 4.46, 6.095 and 10.35 THz for Co3Al, 4.83, 6.11 and 6.86 THz for Co3Ta. Finally, specific heat capacity at a constant volume versus temperature CV of Co3Al and Co3Ta alloys is calculated and discussed using the quasi harmonic approximation. [ABSTRACT FROM AUTHOR]