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- Abbas, Nadeem, 1980-, et al.
(författare)
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Smart Forest Observatories Network : A MAPE-K Architecture Based Approach for Detecting and Monitoring Forest Damage
- 2023
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Ingår i: Proceedings of the Conference Digital solutions for detecting and monitoring forest damage.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Forests are essential for life, providing various ecological, social, and economic benefits worldwide. However, one of the main challenges faced by the world is the forest damage caused by biotic and abiotic factors. In any case, the forest damages threaten the environment, biodiversity, and ecosystem. Climate change and anthropogenic activities, such as illegal logging and industrial waste, are among the principal elements contributing to forest damage. To achieve the United Nations' Sustainable Development Goals (SDGs) related to forests and climate change, detecting and analyzing forest damages, and taking appropriate measures to prevent or reduce the damages are essential. To that end, we envision establishing a Smart Forest Observatories (SFOs) network, as shown below, which can be either a local area or a wide area network involving remote forests. The basic idea is to use Monitor, Analyze, Plan, Execute, and Knowledge (MAPE-K) architecture from autonomic computing and self-adaptive software systems domain to design and develop the SFOs network. The SFOs are planned to collect, analyze, and share the collected data and analysis results using state-of-the-art methods. The principal objective of the SFOs network is to provide accurate and real-time data to policymakers and forest managers, enabling them to develop effective policies and management strategies for global forest conservation that help to achieve SDGs related to forests and climate change.
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- Abdulgadir, Alamin, et al.
(författare)
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Performance Simulation of a Composite Filter Material Containing Mechanical Pulp Fibers, Microfibrillated Cellulose, and Cellulose Nanofibers
- 2022
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Ingår i: Proceedings of the International Mechanical Pulping Conference. ; , s. 160-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Nonwoven fibrous materials with reticular support of an interconnected fiber network and a tortuous airflow pathway have been commonly used in filtration applications. To meet the criteria of filter efficiency and performance, the filter materials are recommended to contain different types of fibers such as mechanical pulp fibers, microfibrillated cellulose, cellulose nanofibers, and other polymer or synthetic fibers with a range of dimensions, i.e., length and diameter. Cellulose fibers in filter media possess irregular and complex structures with hollow or collapsed lumen structures owing to their refinement or pulping method. The development of an appropriate filter media model requires information on actual fiber characteristics. In this study, a simulation method was used to investigate the complex microstructures of filter media. The physical parameters such as fiber wall thickness, diameter, length, cross-section shapes, and curliness were obtained from fiber analyzers and scanning electron microscopy. Based on the experimental findings, GeoDict database comprising different types of common fiber models was constructed. 3-Dimensional fibrous models corresponding to the wet-laid binderless filter material were generated. Using the GeoDict modules, the pore size distributions, average pore sizes, air permeability, pressure drop and initial filter efficiency simulations were performed. The simulation results appear to be in close agreement with the experimental results. The incorporation of cellulose nanofibers resulted in reduced average pore sizes and air permeability of the filter material, thus enhancing the initial filter efficiency. The filter media developed a biobased material derived from pulp fibers for advanced applications such as medical facemask, and air filtration purposes.
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| 9. |
- Abouhatab, Assem, et al.
(författare)
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Determinants of import demand for Egyptian potatoes in Germany and the United Kingdom
- 2016
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Ingår i: Acta Horticulturae. - 0567-7572 .- 2406-6168. ; 1132, s. 39-48
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The European Union (EU) is the major import market for Egyptian fresh potatoes. Germany and the United Kingdom (UK) jointly imported about 44% of Egyptian potato exports to the EU during the period 1994-2012. This study sought to identify the determinants of import demand for Egyptian potatoes in these two countries. A general differentiated demand system approach was used to estimate conditional potato import demand per country. For each country, it was assumed that the system of conditional import demand equations for potatoes is specified according to the sources of origin and also depends on all imported potato prices and total import potato expenditure. When estimated econometrically, this import demand model allows conditional price and expenditure elasticities to be derived. The econometric results indicated that with an estimated elasticity of 1.95, Egyptian potato exports responded significantly to total expenditure on imported potatoes by Germany. On the other hand, Egyptian potato exports to Germany did not exhibit significant price responses. In all cases but one, estimated conditional uncompensated price elasticities were not statistically different from zero. However, more interesting results were obtained concerning the price responses of Egyptian potato exports to the UK, whereby the conditional (uncompensated) direct elasticity of potato imports from Egypt to the UK (-0.71) showed an inelastic response to its own price. Furthermore, Egyptian potato exports seemed to compete on the UK market with potatoes originating from Israel and France, while they displayed complementarity with Dutch imports.
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| 10. |
- Abouhatab, Assem, et al.
(författare)
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Exchange rate uncertainty and Egyptian exports of horticultural commodities into the EU
- 2019
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Ingår i: Acta Horticulturae. - 0567-7572 .- 2406-6168. ; 1258, s. 11-18
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Konferensbidrag (refereegranskat)abstract
- This paper investigates the impact of exchange rate volatility on Egyptian exports of fresh fruit and vegetables (FFVs) to their major importing markets in the EU. Using quarterly data covering the period 1994-2016, we examine the determinants of Egypt’s exports of FFVs to the EU, and then derive the long-term effects of exchange rate volatility on the FFV exports. The empirical results show that exchange rate volatility has a long-run significant effect on Egypt’s FFV exports to the EU. Overall, the findings highlight the importance of exchange rate volatility in understanding the behavior of Egyptian exports of FFVs to the EU. Thus, the design and implementation of exchange rate policies and export promotion programs in Egypt should take into consideration the stability and level of the real exchange rate.
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