1,721,609 research outputs found
Modified Clay and Zeolite Nanocomposite Materials: Environmental and Pharmaceutical Applications
No full textModified Clay and Zeolite Nanocomposite Materials: Environmental and Pharmaceutical Applications retraces the most important knowledge gaps that the scientific community is facing, including a drawback of real-world applications. This valuable resource explores the novel applications of this group of nanomaterials that can be suitably surface-modified to obtain properties that can be applied in environmental and pharmaceutical fields. For example, modification with surfactants has given new motivation to the study of these materials by producing an inversion in the ion exchange behavior from cationic to anionic. This strategy has paved the way for new uses highlighted in this timely resource
Residual Strength Evaluation after Impact Tests in Extreme Conditions on CFRP Laminates
No full textCompression after impact tests were performed using a new apparatus, designed and realized by University of Naples "Federico II", within the Solid Mechanics Program financed by ONR, that allow a more simple functioning and more reliable data respect to the one suggested by the ASTM D7137 Standard. Impact tests were carried out on carbon fibre in vinylester resin laminates of Naval interest, loaded when supported by the devise suggested by the EN6038 European Standard and also when supported by a water pillow, to investigate the influence of the water- material interaction. The results about the residual compression strength evaluation, obtained in different test conditions like increasing impact energy levels, different loading temperatures, different specimens thickness, were compared: they showed a negligible influence of the temperature, even if T = -25°C represents a crucial condition, evidencing a different trend. On the other side, a sensible influence of the load application was noted: the residual strength of the laminates tested on the water is sensibly higher than the one obtained by the traditional pure impact tests. © 2016 The Authors
IL SITO DI VIA LEPANTO: BREVI NOTE SUL TARDOANTICO IN AREA VESUVIANA.
No full textAppendice archeometrica in E. De Carolis, G. Soricelli
Numerical, Experimental and Analytical Correlation for Predicting the Structural Behavior of Composite Structures under Impact
No full textIn the present work, numerical, experimental and analytical results regarding impact events on composite structure are presented. The test case consists in a classic 24 plies CAI specimen (100×150 mm) subjected to 10 J impact. The work can be divided into two phases. The first phase is finalized to the definition of a procedure able to provide a robust numerical model, which can simulate accurately the structural response of composite plates subjected to impact events. At this phase, the numerical results are compared with analytical ones. In the second phase, both inter- and intra-lamina failure are considered. Regarding the inter-laminar failure, an experimental-numerical procedure is defined in order to set the right parameters related to cohesive behaviour. For both phases, trade-off analyses on the main numerical parameters are performed. All numerical results are compared with experimental ones in terms of both energy balance and damaged area. © 2016 The Authors
Automated Procedure for Roll Pass Design
No full textThe aim of this work has been to develop an automatic roll pass design method, capable of minimizing the
number of roll passes. The adoption of artificial intelligence technologies, particularly expert systems, and a
hybrid model for the surface profile evaluation of rolled bars, has allowed us to model the search for the
minimal sequence with a tree path search. This approach permitted a geometrical optimization of roll
passes while allowing automation of the roll pass design process. Moreover, the heuristic nature of the
inferential engine contributes a great deal toward reducing search time, thus allowing such a system to be
employed for industrial purposes. Finally, this new approach was compared with other recently developed
automatic systems to validate and measure possible improvements among them
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