A custom-made numerical model capable of conductive and radiative heat transfer is extensively presented in the paper. It was used for modeling of heat losses in open metal freezing-point cells. Besides the modeling results, experimental results are also presented that confirm the operation of the model. The main objective of the paper is to analyze and evaluate the temperature error due to radiative heat losses in glass cell parts.
COBISS.SI-ID: 10944596
A novel, non-contact, optical type of surface moisture sensor was designed and investigated. It is based on absorption of NIR light absorption from laser source. Two laser sources are used, one with water-absorbing wavelength and the other which is much less affected by water and two InGaAs photo diodes. The sensor’s response was measured by a precision embedded data acquisition system NI CompactRIO and evaluated using a moisture analyser. Razvili smo nov, brez-kontaktni optični merilni sistem za merjenje površinske vlage v materialih. Merilni sistem deluje na podlagi absorpcije svetlobe NIR laserja. Sestavljen je iz dveh laserskih diod, ene z valovno dolžino, ki se v vodi absorbira, in druge, na katero vlaga tako rekoč ne vpliva. Za detekcijo sta uporabljeni dve InGaAs fotodiodi. Odziv senzorja smo izmerili vgrajeni sistemom za zajem podatkov NI CompactRIO in ovrednotili z uporabo analizatorja vlage.
COBISS.SI-ID: 10861652
This paper presents a temperature evaluation method by means of high-speed, visible light digital camera visualization and its application to the mineral wool production process. The proposed method adequately resolves the temperature-related requirements in mineral wool production and significantly improves the spatial and temporal resolution of measured temperature fields. Additionally, it is very cost effective in comparison with other non-contact temperature field measurement methods, such as infrared thermometry. Using the proposed method for temperatures between 800°C and 1500°C, the available temperature measurement range is approximately 300 K with a single temperature calibration point and without the need for camera setting adjustments. In the case of a stationary blackbody, the proposed method is able to produce deviations of less than 5 K from the reference (thermocouple-measured) temperature in a measurement range within 100 K from the calibration temperature. The method was also tested by visualization of rotating melt film in the rock wool production process. The resulting temperature fields are characterized by a very good temporal and spatial resolution (18,700 frames per second at 128 pixels x 328 pixels and 8000 frames per second at 416 pixels 298 pixels).
COBISS.SI-ID: 14157083
The paper describes the measurement and nonparametric estimation of phase difference with stronger inhibition of spectral leakage. Phase difference is estimated by discrete Fourier transform coefficients around component peaks using Rife Vincent windows class I (RV1) and the minimum side-lobe level (MSL) windows. Selecting a suitable window order, MSL windows demonstrate very low bias error and lower noise error propagation than RV1 windows.
COBISS.SI-ID: 10986324
The aim of this study is to show that the utilization of the SS of hesitation in a conversational recommender system (RS) can improve the user quality of experience (QoE) when interacting with a video-on-demand system. The system adjusted the list of the video items to be recommended according to the extracted SS class {hesitation, no hesitation}. Our results showed a significant difference in user satisfaction with the system between those two groups, indicating that the use of SS of hesitation in conversational RS improves the QoE when the user interacts with a video-on-demand
COBISS.SI-ID: 10520916