Suchergebnisse

1. Algunos aspectos psicológicos del mentir en México.-- 2. Psicología de la agresión cotidiana.-- 3. La agresión en la mujer.-- 4. Algunos grandes agresores

"Today, tourism is an important component of development, in terms of economics, knowledge and welfare. The 9th International Conference on Sustainable Tourism aimed to find ways to protect the natural and cultural landscape through the development of solutions which minimise the adverse effects of tourism. Papers from the meeting form this volume."

Rural cultural landscapes are social–ecological systems that have been shaped by traditional human land uses in a co-evolution process between nature and culture. Protected areas should be an effective way to protect cultural landscapes and support the way of life and the economy of the local population. However, nature conservation policymaking processes and management guidelines frequently do not take culturalness into account. Through a new quantitative approach, this paper analyzes the regulatory framework of two protected areas under different management categories, located in an ancient cultural landscape of the Madrid Region (Central Spain), to identify the similarities in their conservation commitments and the effectiveness of their zoning schemes. The results show some arbitrariness in the design and management of these parks, highlighting the importance of prohibited measures in their zoning schemes that encourage uses and activities more related to naturalness than to culturalness. The recognition of protected areas as cultural landscapes and their management considering both naturalness and culturalness issues are important methods of better achieving sustainable management objectives from a social–ecological approach. This methodological approach has proven useful to unravel various legislative content, and its application on a larger scale could reveal important information for the sound management of protected areas (PAs) in cultural landscapes.

The development of new materials for performing photocatalytic processes to remove contaminants is an interesting and important research line due to the ever-increasing number of contaminants on our planet. In this sense, we developed a layered double hydroxide material based on Zn and Cr, which was transformed into the corresponding oxide by heat treatment at 500 & DEG;C. Both materials were widely characterized for their elemental composition, and structural, morphological, optical and textural properties using several experimental techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, scanning and transmission electron microscopy, Fourier transform infrared spectroscopy, UV-vis spectroscopy and physisorption techniques. In addition, the photocatalytic activity of both materials was analysed. The calcined one showed interesting photocatalytic activity in photodegradation tests using crystal violet dye. The operational parameters for the photocatalytic process using the calcined material were optimised, considering the pH, the initial concentration of the dye, the catalyst load, and the regeneration of the catalyst. The catalyst showed good photocatalytic activity, reaching a degradation of 100% in the optimised conditions and showing good performance after five photodegradation cycles. ; This research was funded by 2014-2020 ERDF Operational Programme and by the Department of Economy, Knowledge, Business and University of the Regional Government of Andalusia, grant number FEDER-UCA18-107510.

As cimenteiras são responsáveis por aproximadamente 3% das emissões mundiais de Gases de Efeito Estufa (GEE) e por aproximadamente 5% das emissões de dióxido de carbono (CO2). Uma das alternativas utilizadas para reduzir as emissões de GEE na indústria cimenteira é o uso de combustíveis alternativos por meio do coprocessamento de Resíduos Sólidos (RS) e da utilização de biomassa. Este estudo tem como objetivo analisar a mitigação das emissões de GEE de um cimenteira no Distrito Federal, baseado na utilização de combustíveis alternativos, tendo como foco o coprocessamento de RS no processo produtivo do cimento. A metodologia utilizada foi a Avaliação do Ciclo de Vida (ACV) com a categoria de impacto "mudanças climáticas". Concluiu-se que, dentre os cenários analisados, aquele correspondente à utilização de 70% de coque de petróleo e 30% de Resíduos Sólidos Agrossilvopastoris (RSA) é a melhor alternativa para a geração de calor nos fornos de clínquer do ponto de vista de emissões de GEE.

Concentrating solar power is becoming one of options for producing energy to replace conventional polluting energy sources. However, improving the efficiency and reducing the cost of technologies based on this type of energy to make it more competitive is still a work in progress. This study proposes replacing the thermal oil used as the heat transfer fluid in the absorber tubes of parabolic trough solar collectors (PTCs) with nanofluids based on spherical molybdenum disulphide nanoparticles with the aim of improving the thermal efficiency of concentrating solar power plants. The colloidal stability of the nanofluids was verified by UltravioleteVisible spectroscopy, Zeta potential and Dynamic Light Scattering monitoring. The presence of spherical MoS2 nanoparticles resulted in an increase of up to 13% in specific isobaric heat and 6% in thermal conductivity compared to thermal oil. Finally, the efficiency of parabolic trough solar collectors was estimated to increase by 5%, which also favours the decrease of pumping power and the elimination of selective coatings on the absorber tube. To our knowledge, this is the first time that MoS2-based nanofluids are tested as heat transfer fluids in PTCs analysing its implementation in the solar energy application. © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). ; We acknowledge Ministerio de Ciencia, Innovaci?n y Universidades del Gobierno de Espa?a for funding under Grant No. RTI2018-096393-B-I00 and for financial support related to measurements of thermal properties, which were performed using devices acquired under Grant No. UNCA15-CE-2945. Also, this research was funded by 2014?2020 ERDF Operational Programme and by the Department of Economy, Knowledge, Business and University of the Regional Government of Andalusia, grant number FEDER-UCA18-107510.