2,615 research outputs found
Mechanical design of automatic beach cleaner / Muhammad Qaiyim Almunawwar Ahmad Zawave and Nurulnatisya Ahmad
Get PDFThe aim for this project is to design the machine that capable to help clean up on the beach more efficiently without using a lot of energy and reduces the cost that is affordable for everyone. The method of operating this machine is pushes and pulls mechanism because it has a wheel. Rather than picking up trash on the beach manually, this machine will pick it up automatically without digging into the sand and collecting one by one the trash that found on the beach. The design of the machine should be suitable on sandy place like on the beach because it has a mechanism that separates the sand and trash. The machine also will be design with the right size
Non-discursive knowledge and the construction of identity. Potters, potting and performance at the bronze age tell of Százhalombatta, Hungary
Get PDFThis article explores the relationship between the making of things and the making of people at the Bronze Age tell at Százhalombatta, Hungary. Focusing on potters and potting, we explore how the performance of non-discursive knowledge was critical to the construction of social categories. Potters literally came into being as potters through repeated bodily enactment of potting skills. Potters also gained their identity in the social sphere through the connection between their potting performance and their audience. We trace degrees of skill in the ceramic record to reveal the material articulation of non-discursive knowledge and consider the ramifications of the differential acquisition of non-discursive knowledge for the expression of different kinds of potter's identities. The creation of potters as a social category was essential to the ongoing creation of specific forms of material culture. We examine the implications of altered potters' performances and the role of non-discursive knowledge in the construction of social models of the Bronze Ag
Fig. 5 in Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents
No full textFig. 5. Mechanism of antifungal action of volatile phenolics.Published as part of Ahmad, Aijaz, Elisha, Ishaku Leo, Vuuren, Sandy van & Viljoen, Alvaro, 2021, Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents, pp. 1-17 in Phytochemistry (112864) 190 on page 10, DOI: 10.1016/j.phytochem.2021.112864, http://zenodo.org/record/825715
Fig. 4 in Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents
No full textFig. 4. Mechanism of antibacterial action of volatile phenolics.Published as part of Ahmad, Aijaz, Elisha, Ishaku Leo, Vuuren, Sandy van & Viljoen, Alvaro, 2021, Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents, pp. 1-17 in Phytochemistry (112864) 190 on page 9, DOI: 10.1016/j.phytochem.2021.112864, http://zenodo.org/record/825715
Structural analysis and parametric study ballasted track in sandy regions
No full textThe sand intrusion in railway tracks in sandy regions can significantly change the mechanical behaviour of tracks and thus threaten the safety of train operation. This paper presents substantial field tests on both sandy and clean railway tracks to study the effect of sand intrusion on the longitudinal resistance of ballast bed and the vibration behaviour of track structures. After that, a 3D multi-scale the discrete element model is developed to study the micro-contact between ballast particles and the vibration behaviour of sandy tracks during train passing in detail. Also, the effect of train speeds and axle loads on the mechanical behaviour of sandy tracks is discussed. The results show that the sand intrusion increases the vibration acceleration amplitude of rail and sleeper by 11.3% and 50.3%, while ballast bed decreases by 44.9%. Besides, the sand intrusion significantly changes the energy distribution in the track, wherein the frequencies of the highest energy of rail and sleeper are increased while that of the ballast bed is decreased. The parametric study shows the high train speed can cause the increase in overall acceleration of the ballast bed and high axle load can cause an increase in the micro-contact forces between ballast particles, diffusion angle of the contact force chain, displacements of ballast particles, acceleration of ballast particles, and sleeper displacements.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Mechanics and Physics of Structure
Crushed rock and clay amelioration of a nutrient decifient, sandy soil of Maputaland
No full textBibliography: leaves 57-62.Various studies have suggested the possibility that food derived through subsistence agriculture in the Mseleni region of Maputaland contributes to malnutrition within the local community, particularfy within the high proportion of the population which suffers from a severe, disabling form of osteoarthritis. This study was conducted to determine if the application of local crushed rock or black clay to these nutrient deficient, sandy soils would increase available nutrient concentrations and improve the growth of plants in the ameliorated soil
Fig. 2 in Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents
No full textFig. 2. World map showing the publications of the different countries involved in scholarly publication of the anti-infective properties of volatile phenolics (1985–2019) as retrieved from the Scopus database.Published as part of Ahmad, Aijaz, Elisha, Ishaku Leo, Vuuren, Sandy van & Viljoen, Alvaro, 2021, Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents, pp. 1-17 in Phytochemistry (112864) 190 on page 3, DOI: 10.1016/j.phytochem.2021.112864, http://zenodo.org/record/825715
Fig. 3 in Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents
No full textFig. 3. Term map generated from all keyword fields on the anti-infective of volatile phenolics.Published as part of Ahmad, Aijaz, Elisha, Ishaku Leo, Vuuren, Sandy van & Viljoen, Alvaro, 2021, Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents, pp. 1-17 in Phytochemistry (112864) 190 on page 3, DOI: 10.1016/j.phytochem.2021.112864, http://zenodo.org/record/825715
Sandy coastlines under threat of erosion
Get PDFSandy beaches occupy more than one-third of the global coastline1 and have high socioeconomic value related to recreation, tourism and ecosystem services2. Beaches are the interface between land and ocean, providing coastal protection from marine storms and cyclones3. However the presence of sandy beaches cannot be taken for granted, as they are under constant change, driven by meteorological4,5, geological6 and anthropogenic factors1,7. A substantial proportion of the world’s sandy coastline is already eroding1,7, a situation that could be exacerbated by climate change8,9. Here, we show that ambient trends in shoreline dynamics, combined with coastal recession driven by sea level rise, could result in the near extinction of almost half of the world’s sandy beaches by the end of the century. Moderate GHG emission mitigation could prevent 40% of shoreline retreat. Projected shoreline dynamics are dominated by sea level rise for the majority of sandy beaches, but in certain regions the erosive trend is counteracted by accretive ambient shoreline changes; for example, in the Amazon, East and Southeast Asia and the north tropical Pacific. A substantial proportion of the threatened sandy shorelines are in densely populated areas, underlining the need for the design and implementation of effective adaptive measures.Accepted Author ManuscriptCoastal Engineerin
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