At the time when employees nowdays represent an important resource in achieving business success,... more At the time when employees nowdays represent an important resource in achieving business success, there is an increasing focus on the process of recruitment and selection of personnel, because every company seeks to fill a vacant position with the best candidates, ie. those who best meet the requirements of the job. Therefore, this paper will propose an MCDM approach to the recruitment and selection of personnel by applying methods for decision making, in this case, by applying SWARA and ARAS methods. In order to determine the effectiveness of the proposed model, in the paper will also be presented a numerical example.
The Kojima-Moon-Ochi (KMO) thermodynamic consistency test of vapour-liquid equilibrium (VLE) meas... more The Kojima-Moon-Ochi (KMO) thermodynamic consistency test of vapour-liquid equilibrium (VLE) measurements for 32 isothermal data sets of binary systems of various complexity was applied using two fitting equations: the Redlich-Kister equation and the Sum of Symmetrical Functions. It was shown that the enhanced reliability of the fitting of the experimental data can change the conclusions drawn on their thermodynamic consistency in those cases of VLE data sets that are estimated to be near the border of consistency.
Densities data of n-hexane, toluene and dichloromethane at temperatures 288.15-413.15 K and at pr... more Densities data of n-hexane, toluene and dichloromethane at temperatures 288.15-413.15 K and at pressures 0.1-60 MPa, determined in our previous work, were fitted to the modified Tait equation of state. The fitted temperature-pressure dependent density data were used to calculate the derived properties: the isothermal compressibility, the isobaric thermal expansivity, the difference between specific heat capacity at constant pressure and at constant volume and the internal pressure, over the entire temperature and pressure intervals specified above. In order to assess the proposed modeling procedure, a comparison of the obtained values for the isothermal compressibility and the isobaric thermal expansivity with the corresponding literature data were performed. The average absolute percentage deviations for isothermal compressibility were: for n-hexane 2.01-3.64%, for toluene 0.64-2.48% and for dichloromethane 1.81-3.20%; for the isobaric thermal expansivity: for n-hexane 1.31-4.17%, ...
Hungarian Journal of Industrial Chemistry Volume 9, Issue 4, 1981, Pages 407-415 Enthalpy and ent... more Hungarian Journal of Industrial Chemistry Volume 9, Issue 4, 1981, Pages 407-415 Enthalpy and entropy of pure nonpolar, slightly polar and polar gases (carbon monoxide, propylene, hydrogen sulphide and ammonia) were calculated by two different procedures. One of them is based on the original Redlich-Kwong (RK) equation of state and the other on the RK equation with optimal parameters. 2063 P-v-T data points of 124 isotherms were used to compute enthalpy and entropy of four investigated substances, with respect to the ideal gas reference state. Values of the properties, calculated by two procedures, were compared with experimental and smoothed results. The Redlich-Kwong equation of state is found to be suitable for enthalpy and entropy calculations of nonpolar, slightly polar and polar gases, regardless of whether original or modified form with optimal temperature dependent parameters are applied. However, for a highly polar compound, such as ammonia, better results are obtained with...
Proceedings of the International Thermal Science Seminar Bled. Volume 1, 2000
The effects of mean diameter of particles and of particles concentration, for particles cloud, on... more The effects of mean diameter of particles and of particles concentration, for particles cloud, on the radiative heat flux have been analyzed by a mathematical model. The mathematical model for the radiation of particulate media on the surrounding walls, for 3-D rectangular geometry has been developed. The model is based on the Hottel-Cohen Zone Method for the analysis of radiative heat transfer. Total View Factors for radiative exchange have been evaluated by the Monte Carlo Method. Mie Theory has been used for the determination of the radiative properties of particles cloud in the enclosure. Parameters defining the radiative properties by Mie equations are: particles shape, mean diameter of particles, complex refractive index of particles material, density of material, particles concentration and the wavelength of incident radiation. The particles considered have been of spherical shape. In the zone method, the enclosure and its surrounding surfaces are divided into a number of volume and surface zones, each of which is assumed to have uniform properties. A radiative energy balance is written on each zone giving the net radiative heat transfer between that zone and every other volume and surface zone in the system. The Monte Carlo Method is based on probability and statistics. The concept of energy bundles is introduced to simulate the actual physical process of radiation. A statistically meaningful number of energy bundles are followed from initial points of emission through randomly determined paths until the final points of absorption on the system. The mathematical and physical background of the interaction between incident radiation and a single solid particle is the solution of Maxwell's wave equations. Gustav Mie solved Maxwell,s wave equations with the appropriate boundary conditions for single cylindrical and spherical particles and the resulting equations are called the Mie equations. The main objectives of the study are: To link numerically Hottel-Cohen zone method and Monte Carlo Method with Mie equations and to create an original 3-D computer code for the prediction of heat flux distribution. Using the code, as the results, the distribution of net radiative heat flux on the surfaces of a cube have been predicted for various values of mean diameter of particles and of particles concentration. The parametric study has been carried out keeping constant: complex refractive index of particles material and density of material. The wavelength of incident radiation was varied as well. It has been concluded, inter alia, that the larger is the mass concentration of particles the higher is the radiative heat flux transferred to the surfaces. The influence of particles diameter on the heat flux is not straight forward and it depends on the wavelength of incident radiation.
In this work an apparatus for density measurements in the compressed liquid regions was presented... more In this work an apparatus for density measurements in the compressed liquid regions was presented. This installation is based on the use of the DMA HP density measuring cell and the DMA 5000 densimeter (both instruments are products of Anton Paar, Gratz, Austria). Calibration of DMA HP cell was performed by applying the classical method where a vacuum, water and n-decane were recommended to be used as calibration fluids. To test the capabilities of the set-up, the densities of n-hexane, toluene and dichloromethane were measured in the temperature interval 288.15 to 413.15 K and the pressure range 0.1-60 MPa. The obtained results were compared with the corresponding values found in the literature. Depending on the literature selected for comparison (the temperature and pressure ranges available) the average absolute percentage deviations were: for n-hexane 0.03-0.10%; for toluene 0.04-0.08% and for dichloromethane 0.02-0.03%. A deeper insight into the results of this work shows that ...
At the time when employees nowdays represent an important resource in achieving business success,... more At the time when employees nowdays represent an important resource in achieving business success, there is an increasing focus on the process of recruitment and selection of personnel, because every company seeks to fill a vacant position with the best candidates, ie. those who best meet the requirements of the job. Therefore, this paper will propose an MCDM approach to the recruitment and selection of personnel by applying methods for decision making, in this case, by applying SWARA and ARAS methods. In order to determine the effectiveness of the proposed model, in the paper will also be presented a numerical example.
The Kojima-Moon-Ochi (KMO) thermodynamic consistency test of vapour-liquid equilibrium (VLE) meas... more The Kojima-Moon-Ochi (KMO) thermodynamic consistency test of vapour-liquid equilibrium (VLE) measurements for 32 isothermal data sets of binary systems of various complexity was applied using two fitting equations: the Redlich-Kister equation and the Sum of Symmetrical Functions. It was shown that the enhanced reliability of the fitting of the experimental data can change the conclusions drawn on their thermodynamic consistency in those cases of VLE data sets that are estimated to be near the border of consistency.
Densities data of n-hexane, toluene and dichloromethane at temperatures 288.15-413.15 K and at pr... more Densities data of n-hexane, toluene and dichloromethane at temperatures 288.15-413.15 K and at pressures 0.1-60 MPa, determined in our previous work, were fitted to the modified Tait equation of state. The fitted temperature-pressure dependent density data were used to calculate the derived properties: the isothermal compressibility, the isobaric thermal expansivity, the difference between specific heat capacity at constant pressure and at constant volume and the internal pressure, over the entire temperature and pressure intervals specified above. In order to assess the proposed modeling procedure, a comparison of the obtained values for the isothermal compressibility and the isobaric thermal expansivity with the corresponding literature data were performed. The average absolute percentage deviations for isothermal compressibility were: for n-hexane 2.01-3.64%, for toluene 0.64-2.48% and for dichloromethane 1.81-3.20%; for the isobaric thermal expansivity: for n-hexane 1.31-4.17%, ...
Hungarian Journal of Industrial Chemistry Volume 9, Issue 4, 1981, Pages 407-415 Enthalpy and ent... more Hungarian Journal of Industrial Chemistry Volume 9, Issue 4, 1981, Pages 407-415 Enthalpy and entropy of pure nonpolar, slightly polar and polar gases (carbon monoxide, propylene, hydrogen sulphide and ammonia) were calculated by two different procedures. One of them is based on the original Redlich-Kwong (RK) equation of state and the other on the RK equation with optimal parameters. 2063 P-v-T data points of 124 isotherms were used to compute enthalpy and entropy of four investigated substances, with respect to the ideal gas reference state. Values of the properties, calculated by two procedures, were compared with experimental and smoothed results. The Redlich-Kwong equation of state is found to be suitable for enthalpy and entropy calculations of nonpolar, slightly polar and polar gases, regardless of whether original or modified form with optimal temperature dependent parameters are applied. However, for a highly polar compound, such as ammonia, better results are obtained with...
Proceedings of the International Thermal Science Seminar Bled. Volume 1, 2000
The effects of mean diameter of particles and of particles concentration, for particles cloud, on... more The effects of mean diameter of particles and of particles concentration, for particles cloud, on the radiative heat flux have been analyzed by a mathematical model. The mathematical model for the radiation of particulate media on the surrounding walls, for 3-D rectangular geometry has been developed. The model is based on the Hottel-Cohen Zone Method for the analysis of radiative heat transfer. Total View Factors for radiative exchange have been evaluated by the Monte Carlo Method. Mie Theory has been used for the determination of the radiative properties of particles cloud in the enclosure. Parameters defining the radiative properties by Mie equations are: particles shape, mean diameter of particles, complex refractive index of particles material, density of material, particles concentration and the wavelength of incident radiation. The particles considered have been of spherical shape. In the zone method, the enclosure and its surrounding surfaces are divided into a number of volume and surface zones, each of which is assumed to have uniform properties. A radiative energy balance is written on each zone giving the net radiative heat transfer between that zone and every other volume and surface zone in the system. The Monte Carlo Method is based on probability and statistics. The concept of energy bundles is introduced to simulate the actual physical process of radiation. A statistically meaningful number of energy bundles are followed from initial points of emission through randomly determined paths until the final points of absorption on the system. The mathematical and physical background of the interaction between incident radiation and a single solid particle is the solution of Maxwell's wave equations. Gustav Mie solved Maxwell,s wave equations with the appropriate boundary conditions for single cylindrical and spherical particles and the resulting equations are called the Mie equations. The main objectives of the study are: To link numerically Hottel-Cohen zone method and Monte Carlo Method with Mie equations and to create an original 3-D computer code for the prediction of heat flux distribution. Using the code, as the results, the distribution of net radiative heat flux on the surfaces of a cube have been predicted for various values of mean diameter of particles and of particles concentration. The parametric study has been carried out keeping constant: complex refractive index of particles material and density of material. The wavelength of incident radiation was varied as well. It has been concluded, inter alia, that the larger is the mass concentration of particles the higher is the radiative heat flux transferred to the surfaces. The influence of particles diameter on the heat flux is not straight forward and it depends on the wavelength of incident radiation.
In this work an apparatus for density measurements in the compressed liquid regions was presented... more In this work an apparatus for density measurements in the compressed liquid regions was presented. This installation is based on the use of the DMA HP density measuring cell and the DMA 5000 densimeter (both instruments are products of Anton Paar, Gratz, Austria). Calibration of DMA HP cell was performed by applying the classical method where a vacuum, water and n-decane were recommended to be used as calibration fluids. To test the capabilities of the set-up, the densities of n-hexane, toluene and dichloromethane were measured in the temperature interval 288.15 to 413.15 K and the pressure range 0.1-60 MPa. The obtained results were compared with the corresponding values found in the literature. Depending on the literature selected for comparison (the temperature and pressure ranges available) the average absolute percentage deviations were: for n-hexane 0.03-0.10%; for toluene 0.04-0.08% and for dichloromethane 0.02-0.03%. A deeper insight into the results of this work shows that ...
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