The article deals with the quality evaluation of engraved surfaces of selected materials after application of CO2 E4060 laser. A machined steel was chosen steel ČSN 11 373, engraving was carried out on aluminium alloy EN AW 7075, plexiglass XT, plywood and cardboard. Engraving was performed under predetermined power conditions and laser feed rates. Marking of metallic materials was made after applying the marking paste LMM 6000. The evaluation was made on the basis of a visual inspection and then a suitable combination of parameters was chosen for individual materials.
Zhen Jiao, Ziyi Wang, Xiudong Wang and Wenjing Fan
The operation parameters for the supercritical carbon dioxide (ScCO2) evaporation method greatly affect the properties of the prepared drug-loaded micelles. In this study, the effects of those key parameters on the drug-loading content (LC) and drug entrapment efficiency (EE) are discussed. It is observed that EE and LC of the micelles are slightly increased with the enhancing temperature and the copolymer molecular ratio of hydrophilic/hydrophobic segment, while decreased with the enhancing ScCO2 evaporation rate. The pressure and volume ratio of ScCO2 to H2O are observed the optimum condition. In addition, the verification experiment is carried out under the obtained optimizing parameters. The prepared micelles exhibit relatively regular spherical shape and narrow size distribution with the EE and LC value of 70.7% and 14.1%, respectively.
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Macho Oliver, Čierny Matúš, Gabrišová Ľudmila, Juriga Martin, Ružinský Radovan and Peciar Peter
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the weld nugget and joint strength depends upon the selection of the welding processparameters. Normally, the welding processparameters are selected based on experience or from handbooks. However, it does not ensure that the selected welding processparameters can produce an optimal strength of the weld.
In order to increase the strength of products, many researchers have studied RSW process by experimental and numerical techniques. Eisazadeh et al . [ 2 ] developed an incremental finite element model for the parametric study of nugget
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