An optical system for measuring the eccentricity of glass wool pipe — for industrial use
An optical system for measuring the eccentricity of the glass wool pipe has been developed for an industrial use. The system consists of a contact sensor, a photo light sensor and a signal processing system with a logic circuit. The system is simple, fast and efficient for practical use; it allows implementation of on-line process monitoring and alarm warning signals for unacceptable pipe eccentricity during manufacturing.
Processo de reciclagem da escória de aciaria e do resíduo de corte do granito visando a produção de lã mineral
The aim of this work was to study the use of steelmaking slag and waste from granite cutting as raw material to the production of glass wool and rock wool. Firstly, the chemical composition of the slag and the granite waste were analyzed. These results were used to infer the amount of additives to assemble the charge for the experiments. Two charges compositions were aimed: the composition of glass wool and rock wool found in the literature. Thus, six mixtures were prepared: two using steelmaking slag as main raw-material, two using granite cutting waste as main raw-material and two mixtures of both residues as main raw material. A laboratory-scale electric furnace was used to melt the studied mixtures of residues and additives used as charge. Three different temperatures were studied: 1400oC, 1450oC and 1500oC. Firstly, a small amount of the melt material were turned into a water filled recipient, this process was performed in order to impose a fast freezing that is a characteristic of mineral wool production. Finally, with the rest of the melt material it was performed the Herty Viscosity Test. Samples of the produced material were characterized by chemical analysis, X-ray diffraction and Scanning Electronic Microscopy. The results found in this research may lead to a technological innovation, because they indicate that the use of residues to produce glass and rock wool is possible.
Noctilucent cloud observations over Greenland by a Rayleigh lidar
We report on the detection of noctilucent clouds (NLCs) by a Rayleigh lidar system located on the west coast of Greenland during operations in July and August 1994. The lidar detected NLCs in the zenith on three nights (July 28–29, July 31–August 1, and August 4). The lidar measurements are presented at temporal (1 minute) and spatial (192 meter) resolutions exceeding previously reported lidar measurements of NLCs and reveal significantly more structure in the clouds. Unique cloud features are observed for each night NLCs were detected. Because of the large backscatter ratio associated with NLCs, the volume backscatter coefficient for the cloud particles can be determined more accurately from the lidar signal than the backscatter ratio as the upper mesospheric molecular number density is negligible in the volume backscatter coefficient calculation. The volume backscatter coefficient values determined from the three nights of NLC observations would be classified by current models as moderate to extreme. The extreme backscatter from NLC measurements on August 4 tests the assumptions used in existing models.