2,660 research outputs found
Desarrollo de un recubrimiento sostenible elaborado por nanopartículas de sílice y biocidas naturales para la protección a largo plazo de superficies pétreas del patrimonio cultural frente al biodeterioro
No full textEl artículo presenta una investigación del Instituto de Restauración del Patrimonio de la Universidad Politécnica de Valencia, dirigida por Pilar Bosch Roig, sobre el desarrollo de un recubrimiento sostenible para proteger superficies pétreas del patrimonio cultural frente al biodeterioro. Este recubrimiento utiliza nanopartículas de sílice mesoporosa que liberan de forma controlada biocidas naturales como; limoneno, tomillo y orégano, seleccionados por sus propiedades antimicrobianas. El estudio analiza los efectos de deterioro de microorganismos ,como hongos y bacterias, sobre materiales como mármol y granito, incluyendo muestreos en obras y estructuras históricas. Se aplicó la formulación en muestras de mármol y se realizaron análisis microscópicos para observar la interacción entre hongos y superficies tratadas. La investigación combina ciencia de materiales y biodiversidad mediterránea para ofrecer una alternativa ecológica y efectiva en la conservación del patrimonio cultural
Uncovering Pathways for Girls' Education: Gender equity and early childhood development
No full textAndrea Bosch addresses strategies that can make a difference for women's and child's rights: girls' education. She discusses multi-channel learning as an educational strategy that attempts to overcome the traditional boundaries of the daily responsibilities of girls in developing countries through the careful design and combination of channels for girls to engage in learning. Through linking up and improving the quality of existing educational and communication channels, she argues that the opportunities for girls to learn and for young children to avail themselves of the benefits of their education are dramatically expanded. Development (2001) 44, 41–46. doi:10.1057/palgrave.development.1110235
Electrified Haber-Bosch Process: Green Ammonia Production
No full textThis report provides a design for a new process to make the ammonia-producing Haber-Bosch process more sustainable by reducing its CO2 emissions. It presents different elements of a process design with most importantly; process diagrams, mass and energy balances and a techno-economic analysis. The most important differences in this process is the use of water electrolysis and nitrogen production. This process emits approximately 50% less CO2 than regular Haber-Bosch methods. Nevertheless, the techno-economic analysis shows that this method is very expensive and that ammonia can only be sold at an acceptable price conform to the market with subsidies on electricity prices and can only become competitive if CO2 taxes are implemented for classic Haber-Bosch plants.Renewables Based Energy Conversion and StorageWB3595 Design ProjectMechanical Engineering | Process and Energy Technolog
Cambio tecnológico, tercerización laboral e impactos sobre el empleo : desafíos desde y para una narrativa argentina
No full textVictoria Basualdo - Hernán Letcher - Silvia Nassif - Mariano Barrera - Nayla Bosch - Andrea Copani - Pablo Peláez - Mauro RojasLiteraturverzeichnis Seite 63-6
Re: A Randomized Study of Intraoperative Autologous Retropubic Urethral Sling on Urinary Control After Robotic Assisted Radical Prostatectomy
No full textHotter cities, hazier skies: exploring aerosol feedback to urban heat using satellite data
No full textAtmospheric aerosols play a key role in the radiative balance of the Earth system, modulating the amount of solar radiation that reaches the surface and altering longwave heat retention. In urban areas, these processes can influence the development and intensity of the urban heat island (UHI), potentially amplifying or reducing surface temperature anomalies. This work investigates the relationship between aerosols and surface heating using multi-source satellite data. We employ sharpened Landsat land surface temperature (LST) maps and MODIS aerosol optical depth (AOD) products to explore aerosol heat feedbacks at very high spatial resolution. A case study is presented on Poznań, Poland, to show how differences in aerosol loading are associated with distinct UHI signatures. The results highlight the importance of integrating aerosol information into urban climate studies to better understand the complex interactions driving heat extremes
The Tide of the Unconscious Jung, Bosch and the Archetypes of The Garden of Earthly Delights
No full textMany scholars have discussed the meaning of Hieronymous Bosch\u27s The Garden of Earthly Delights concluding that Bosch\u27s works were of a conscious nature relating to the real world. By contrast, this study, using the theories of Carl Jung, fragments Bosch\u27s work and sees the milieu of his art through the eyes of the collective unconscious. Accordingly, a number of explanations of Jungian ideas are presented with the view to better understanding Bosch: Jung\u27s theory of the archetypes, his view of Christianity, his analysis of medieval alchemy, as well as matrix archetypes and symbolic forms relating to The Garden. Through this procedure an attempt is made to create a nexus between Bosch\u27s work and Jung\u27s theoretical constructs. The thesis does not draw conclusions, but rather looks at possibilities of meaning to be found in The Garden
Green Haber-Bosch Process:A Small-Scale Ammonia Reactor System Design
No full textThe global energy transition from a fossil fuel base energy system to a renewable energy source base system is the key mission for a low-carbon future. The target of CO2 emission reduction by 2050, following the Paris Climate Agreement, is 90% compared to the CO2 level of 1990. Haber-Bosch process is the main industrial procedure for the production of ammonia today and about 80% of the global ammonia is consumed by the fertilizer industry. However, the century old Haber-Bosch process is normally energized by fossil fuel and itreleases about 3% of the global carbon footprint. In light of this fact, replacing the conventional fossil fueled Haber-Bosch process for manufacturing ammonia with renewable source powered ammonia production is the main goal of this study. Instead of obtaining H2 from steam-reformed CH4, H2 is produced from electrolyzed H2O. This transition enables the conventional ammonia manufacturing process transforming into a green Haber-Bosch production of ammonia. Two Dutch companies, TNO and Zero Emission Fuels, are cooperatingand developing a small scale of reactor system that can convert ammonia from air and water by using solar PV panels. In this work, a new design of ammonia reactor system is developed. Ammonia is typically formed at high pressure (150 - 250 bar) and high temperature (400 - 500oC) using a promoted iron base catalyst. High temperature ensures rapid reaction kinetics, and high pressure boosts the product yield. Here a reactor system, that is operated at lower pressure (≤100 bar) and uses condensation to remove ammonia, is kinetically simulated in ASPEN. The effect of different operation conditions - reaction temperature (300oC, 350oC and 400oC) , pressure (50, 75 and 100 bar) and feed gas (N2 : H2) ratio (1 : 3 and 1 : 5) - on the production rate in a small-scale ammonia reactor have been systematically computed. The mass flow rate of the single pass reactor is set to 50 g/h in this work. With a catalyst bed length of 15 cm and inner diameter of 3.6 cm, according to the simulation, reaction temperature of 400oC and operating pressure of 100 bar can lead to the highest conversion (40%) in a single pass reactor. The average heat transfer area of the reactor system is to a great extend less than 50 m2, therefore, the double pipe heat exchanger is a favorable heat exchange system for the proposed reactor system. In the reactor design validation section, the selected optimum operation conditions are tested in the same scale reactor laboratory setup. Experimental results show that the single pass conversion of nitrogen at 400oC and 100 bar in such a small-scale reactor can reach 15.4% which is in the range of the industrial one pass conversion level. For reaction operated at 50 bar, 6% of ammonia yield is obtained. It is clear that ammonia production in small-scale and in milder operation condition is possible and the results are promising. The techno-economic analysis has been performed based on above mentioned outcome. The reactor system is integrated with ZEF AEC, ZEF compressor system and a membrane nitrogen separation system. With current ammonia design production (350 g/day), the cost of ammonia per kilogram can be achieved in the range of €1.8 to €2 depending on the operation condition. This is about 5 times more than fossil ammonia prices, but it is very competitive with biomass ammonia. In accordance with the sensitivity analysis, increasing the capacity of feed gas production or reducing the cost in plant equipment can remarkably reduce the ammonia price to less than 1 €/kg NH3. Furthermore, recommendations in four categories are discussed in the last section of this work, which can lead to a further step towards a green ammonia plant in small-scale.Mechanical Engineering | Process and Energy Technolog
Ontologies, Different Reasoning Strategies, Different Logics, Different Kinds of Knowledge Representation: Working Together
No full textThe recent experiences in the building, maintenance and reuse of ontologies has shown that the most efficient approach is the collaborative one. However, communication between collaborators such as IT professionals, librarians, web designers and subject matter experts is difficult and time consuming. This is because there are different reasoning strategies, different logics and different kinds of knowledge representation in the applications of Semantic Web. This article intends to be a reference scheme. It uses concise and simple explanations that can be used in common by specialists of different backgrounds working together in an application of Semantic Web
Objectivity and Plausibility in the Study of Organizations
No full textThe author argues that though it is impossible to know whether a theoretical claim
is epistemically objective or not, it may be accepted as plausible when it is felt to be in some accordance with “the given”—
empirical findings, subjective/intersubjective ideas, thoughts and feelings, and the opinions of and cultural categories used by
others. Processes of resistance and accommodation occur during research as well as within scientific communities, enhancing
the plausibility of certain theoretical claims over others. Accepted theories feed back into the research process as well as its
subject matter, thereby affecting subjective/intersubjective judgments of plausibility. Openness, honesty, and responsibility are
particularly important in the evaluation of the plausibility of theoretical claims.
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