Thin films of pure bismuth were deposited by vacuum thermal evaporation onto glass substrates maintained at different temperatures: 27 deg. C, 50 deg. C, 100 deg. C, 150 deg. C and 200 deg.C, respectively. The structure of the obtained films was analyzed by means of X-ray Diffractometry, with a Shimadzu diffractometer, which operates with a Cu target. The XRD patterns corresponding to a wide angular range proved the polycrystallinity of the bismuth

Bismuth trioxide (Bi2O3) thin films were prepared by dry thermal oxidation of metallic bismuth films deposited by vacuum evaporation. The oxidation process of Bi films consists of a heating from the room temperature to an oxidation temperature (To = 673 K), with a temperature rate of 8 K/min; an annealing for 1 h at oxidation temperature and, finally, a cooling to room temperature. The optical transmission and reflection spectra of the films were

The analysis of the sounds emitted by the new system of bells from the Saint Trinity Cathedral of Alba Iulia, Romania was performed and compared to a witness sound, by means of complex acoustic analysis programs called Wavanal and Sigview. The study of the partials influence on the amplitude, intensity and, inherently the pitch of the resulting sounds emitted by the bells system is also considered. The change in time of the partials intensity and

Measuring the thickness of steel plates during the hot rolling process is crucial for getting the necessary feedback to obtain the desired values at room temperature. The dilatation and the phase transformations of steel occur during heating and subsequent cooling and rolling strongly influences the results of thickness measurements. The radiometric method provides the necessary means for making real-time and fully automatized measurements of steel

Different optical parameters for thin solid films can be computed as functions of wavelength from the optical transmission and reflection spectra. Subsequently, several models can be tested on the obtained data, in order to check their validity with respect to the materials under study. Moreover, these models offer the possibility to estimate essential physical parameters. Such models are tested within this article for the refraction index and for

The influence of thermal treatment (different annealing atmospheres) on the electrical properties of cobalt oxide thin layers was studied. The layers were fabricated by sol-gel technique. Electrical properties were determined by the four–point probe method and Van der Pauw technique. The film resistivity decreases with temperature which confirms the semiconductor nature of the film. For the same film thickness value, the layers exposed in air exhibit

Bismuth trioxide and antimony trioxide were deposited by thermal vacuum evaporation one on top of the other. The temperature of the substrate during deposition was maintained at 20 deg. C, 70 deg. C and 120 deg. C, respectively. Also, the deposition order of the two oxides was reversed, in order to find if there is any change in the properties of the entire two oxides structure. Their structural characteristics were studied by means of X-ray diffraction

Thin-film coatings based on cobalt oxides are obtained. For depositing cubic spinel Co3O4 and CoO films the sol-gel dipcoating technique was used. The as-deposited films were subjected to different thermal treatments in air and in reducing atmosphere (H2/N2), respectively. Optical absorption spectroscopy, X-ray diffraction and atomic force microscopy (AFM) were used to characterize the samples. The Swanepoel method was employed for the study of the

Structural and optical analysis of bismuth oxide thin films was studied. The vacuum thermal evaporation was used to prepare bismuth films onto glass substrates maintained at different temperatures. Subsequently, their thermal oxidation in air was performed for 1 and 2 hours time, respectively. The optical measurements consisted in recording the transmission and reflection spectra of the films at an UV/VIS Spectrometer. The structural characteristics

Alumina protective coatings were made on steel samples by pulsed laser deposition. Improvement of the thermal shock resistance of the steel is the main purpose of such a steel coating. The adhesion of the aluminum oxide thin layer on the steel base was increased by a whole new technique. Thus, microdimensional holes were done in the coating by a pulsed Nd:YAG laser. The characteristics of the laser and the geometry of the experiment were analyzed