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RISS 인기검색어
- 검색키워드
- 저자 : Rodríguez-Lelis (검색결과 3 건)
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Iron oxide coating films in soda-lime glass by triboadhesion
J. O. Aguilar,J. M. Rodríguez-Lelis,M. J. Arjona 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
In the triboadhesion process the coating material is passed through a rotating cotton mop and the substrate to be coated. The cotton mop rotates at high velocity and exerts pressure on the surface of the substrate. The combined effect of pressure and velocity of the coating mop on the substrate increases its temperature close to the melting point, allowing deposition and diffusion of the coating material within the substrate. After it is deposited, its particles are embedded within the base material forming a thin film composite. The amount of the coating material deposited on the substrate has its maximum at the surface and then decreases as a function of the local temperature within the base material. Bearing this in mind, in the present work, triboadhesion is employed to deposit iron oxide in a substrate of soda-lime glass, with the purpose of determining the feasibility of using this technique for solar control coatings. It was found, through electronic scan microscopy, that a composite material film is formed following the coating direction. Reflectance and transmittance tests were carried out on the glass samples. A 20% difference was found in the visible spectral region (VIS), and a reduction between 10 and 20% in the Near Infrared Region (NIR). These results showed that the triboadhesion is a promising technique for the application of thin films for solar control or solar cells.
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Adhesion strength in laminated glazings containing multilayer solar control coatings
J. O. Aguilar,J. M. Rodríguez-Lelis,M. Carrasco de la Fuente,C. López-Mata,J. A. Arellano-Cabrera,F. Chan 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.6
We report on the mechanical and optical properties exhibited by a five layer laminated glazing (glass/PVB/PET/PVB/glass) in which a 0.1 mm thick polyethylene-terephthalate (PET) sheet carries a 70-110 nm CuS solar control coatings on either one or both sides of it and laminated with 0.38 mm clear polyvinyl-butyral (PVB) sheets in an autoclave at 135°C for 30 min under a pressure, 13 kg/cm2. The CuS coating was obtained by chemical deposition at 28°C during 1 h (70 nm) or 2 h (110 nm). The optical transmittance (T) of these laminated glazing is less than 1% in the ultraviolet region; 17-32% in the visible region, and 4-12% in the infrared region, depending on the CuS film thickness and whether the PET sheet is coated on one or both sides. The specular reflectance (R) of the glazing in the visible region is similar to that of a monolithic glass: about 10%, but in the infrared it increases toward 20%. The mechanical properties were evaluated through a compressive test giving interfacial adhesive strength of the laminated: 1.5-2 MPa for PET with a single side CuS coating and 3.4 MPa for the laminate with a PET coated on both sides.
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A general exergy-based environmental impact index
Sósimo E. Díaz-Méndez,José María Rodríguez-Lelis,Abel Hernández-Guerrero 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.8
An ecosystem is a complex system in which biotic and abiotic factors interact and influence each other both directly and indirectly. Each of these factors has to comply with a specific function in the different processes that occur inside the ecosystem, whether transporting or transforming energy or both. When anthropogenic emissions are produced, part of the useful energy of the ecosystem is used to assimilate or absorb those emissions, and the energy spent, loses its function and becomes lost work in accordance with the Gouy-Stodola theorem. Thus, the work that an ecosystem can carry out varies as a function of the lost work produced by anthropogenic sources. The permanency or loss of the ecosystem depends on how many irreversibilities it can support. The second law of thermodynamics through a systematic use of the exergy and lost work is the basis of this paper where a general environmental impact index, based on exergy, is proposed. For the purpose of this work, the ecosystem is divided in subsystems--water, soil, atmosphere, organisms and society--all of them inter-related. The ideal work variation can be obtained from each subsystem within the selected ecosystem, and a global index can be determined by adding the partial lost work of each subsystem. This global index is then used to determine the trend followed by the ecosystem from its pristine, original or environmental line base state. This environmental impact index applicability is presented for a simple combustion example.
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