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Sökning: LAR1:ltu > (2010-2019)

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  • Abdul-Jalbar, Beatriz, et al. (författare)
  • A new heuristic to solve the one-warehouse N-retailer problem
  • 2010
  • Ingår i: Computers & Operations Research. - 0305-0548 .- 1873-765X. ; 37:2, s. 265-272
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We deal with a multi-echelon inventory system in which one warehouse supplies an item to multiple retailers. Customer demand arrives at each retailer at a constant rate. The retailers replenish their inventories from the warehouse that in turn orders from an outside supplier. It is assumed that shortages are not allowed and lead times are negligible. The goal is to determine replenishment policies that minimize the overall cost in the system. We develop a heuristic to compute efficient policies, which also can easily be used in a spreadsheet application. The main idea consists of finding a balance between the replenishment and the inventory holding costs at each installation. This new heuristic we compare with two other approaches proposed in the literature; the computational studies show that in most of the instances generated the new method provides lower costs.</p>
  • Abdulbaqi, Dana M., et al. (författare)
  • Enhanced Oil Recovery (EOR) as a Stepping Stone to Carbon Capture and Sequestration (CCS)
  • 2018
  • Ingår i: Mineral Economics. - Springer. - 2191-2203 .- 2191-2211. ; 31:1-2, s. 239-251
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Environmental concerns about carbon emissions coupled with the oil industry’s need to secure additional CO<sub>2</sub> for enhanced oil recovery (CO<sub>2</sub>-EOR) projects have sparked interest in the potential that CO<sub>2</sub>-EOR may have in jumpstarting carbon capture and sequestration (CCS). However, existing studies on the viability of coupling CO<sub>2</sub>-EOR with CCS have generally placed more focus on either the engineering or economic aspects of the problem. Most engineering studies focus on the technical aspects of the CO<sub>2</sub>-EOR project to produce the maximum amount of oil, while simultaneously storing the most CO<sub>2</sub> during the production process with the economics as an afterthought, while most economic studies found have focused on a singular aspect of the issue such as impacts of exogenously varying injection rates. Furthermore, modelling efforts have stopped at the end of the productive life of the field. We build a unique two-stage dynamic optimization model, which simultaneously addresses engineering and economic policy aspects, to study the viability of coupling CO<sub>2</sub>-EOR transitioning into CCS. Our model includes a carbon tax for emissions, which becomes a subsidy for full scale sequestration after oil production has ceased; this allows us to explore the transition from CO<sub>2</sub>-EOR, our first stage, to sole CO<sub>2</sub> sequestration in our second stage for a single field. We maximize the operator’s profits across both stages, while tracking the responsiveness of oil production and total carbon movements to both price and policy changes. We pair our optimization model with a reservoir simulation model, allowing us to mimic actual field behavior, giving our work a more realistic representation of both production and sequestration profiles. Our results suggest that small increases in the level of carbon tax can have large and discontinuous impacts on net sequestration. This stems from the observed transition from limited natural sources of CO<sub>2</sub> to more expensive captured CO<sub>2</sub> resulting from the implemented policy. With appropriate taxes, total volumes of captured CO<sub>2</sub> sequestered across both stages are equivalent to 30 to 40% of the emissions from the use of the oil produced. With the credits oil producers receive from sequestering CO<sub>2</sub>, which equate to the tax, relatively high carbon taxes incentivize additional sequestration without significantly impacting the supply of oil. This, alongside maintaining a steady stream of profits, is a win-win situation for energy security and the climate.</p>
  • Abdullah, M Ailieen, et al. (författare)
  • Building Networks for Delivering Integrated Product-Service Offerings (IPSOs)
  • 2010
  • Ingår i: Industrial product-service systems -IPS² : proceedings of the 2nd CIRP IPS² Conference [2010, Linköping, 14-15 April]. - Linköping. - 978-91-7393-381-0
  • Konferensbidrag (refereegranskat)abstract
    • <p>The paper describes the effect of forming business networks and collaborations for the purpose of developing an Integrated Product-Service Offering (IPSO) using the Product/Service Systems (PSS). The research method is an in-depth case study of a joint venture formed by four companies developing a new technology for chemical extraction from water sludge waste within the pulp and paper industry.Combining literature from PSS, network theories and collaborative product development, this paper puts forward the benefits for SMEs to collaborate in business networks and produce IPSOs when introducing a new technology in an emerging market. The case study shows that working towards the new market would not have been possible if each party acted individually or maintained their traditional buyer-supplieroperator roles, and that IPSOs can reduce the business risk.</p>
  • Abdullah, Mukhalad, et al. (författare)
  • Water Resources Projects Large Storage Dams
  • 2019
  • Ingår i: Journal of Earth Sciences and Geotechnical Engineering. - UK : Scientific Press International Limited. - 1792-9040 .- 1792-9660. ; 9:4, s. 109-135
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Several dams were built on Tigris, Euphrates, and Tigris tributaries in Iraq. The construction of dams had been done in the second half of 20th century. Of the most critical issues confronting the large storage dams in Iraq are the liquefactions in Mosul Dam foundations, land sliding and earthquake effects in Darbandikhan Dam, and the essential maintenance and rehabilitation requirements almost for all the dams. Absolutely, large storage dams made Iraq surviving from thirst in several occasions. Unfortunately, after 2003, the attention or will are not exist pertaining the building of new or partially built large dams.      </p>
  • Abdullah, Mukhalad, et al. (författare)
  • Water Resources Projects in Iraq Reservoirs in The Natural Depressions
  • 2019
  • Ingår i: Journal of Earth Sciences and Geotechnical Engineering. - UK : Scientific Press International Limited. - 1792-9040 .- 1792-9660. ; 9:4, s. 137-152
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Iraq had suffered for centuries from devastating floods, causing heavy life and property losses and for occasions it demolished the civilizations. Since 1950s, Iraq started to develop several natural depressions to function as escape to mitigate flood waves. The projects of this kind which had developed are: Habbaniyah project, Tharthar project, Schweicha depression and Southern Marshes. The exploitation of these projects comprises building barrages, regulators, and dykes. For Tharthar and Habbaniyah, the diverted water re-used during drought season. Although, these depressions which serve as reservoirs provide invaluable role in flood protection, the construction of the existing and future dams will reduce the feasibility of these projects.</p>
  • Abdullah, Mukhalad, et al. (författare)
  • Water Resources Projects in Iraq Barrages
  • 2019
  • Ingår i: Journal of Earth Sciences and Geotechnical Engineering. - UK : Scientific Press International Limited. - 1792-9040 .- 1792-9660. ; 9:4, s. 153-167
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Barrages are the early water resources structures that were built in the modern history in Iraq. The main function of the barrages to rise the water levels to feed the main canals of irrigation projects. Further, some barrages are functioning as a diversion structures during floods. The first built barrage and still in operation is Kut Barrage which opened in 1939, while the last one is Amarah Barrage that were opened in 2004. Some of the barrages are in good conditions, some are suffering from technical issues, and others especially at the lower reaches of Tigris and Euphrates Rivers getting insufficient maintenance. Generally, the upstream approaches need dredging of the sediments and small islands, and there is a need also for bathymetric survey of the rivers sections near barrages.  </p><p></p>
  • Abdullah, Mukhalad, et al. (författare)
  • Water Resources Projects in Iraq Irrigation Projects on Euphrates
  • 2019
  • Ingår i: Journal of Earth Sciences and Geotechnical Engineering. - UK : Scientific Press International Limited. - 1792-9040 .- 1792-9660. ; 9:4, s. 169-199
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Euphrates River is distinguished with long existing irrigation projects, which had been developed in the 20th century after centuries of deterioration. One of the major projects a long Euphrates inside Iraq is Great Abu Ghraib Project, which is the largest reclaimed area. Also, Great Musayab Project, Kifl-Shinafiyah Project and Shinafiyah-Nasiriya Project are other major projects. The most important for which Hindiyah Barrage had been built is Hilla Branch that supply many projects on both sides of this branch. Euphrates irrigation projects need a lot of investments to develop the status of the projects and confront the continuous decrease in water quality of the river. </p>
  • Abdullah, Mukhalad, et al. (författare)
  • Water Resources Projects in Iraq Irrigation Projects on Tigris
  • 2019
  • Ingår i: Journal of Earth Sciences and Geotechnical Engineering. - UK : Scientific Press International Limited. - 1792-9040 .- 1792-9660. ; 9:4, s. 201-230
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Along Tigris River reach inside Iraq, many large and small projects of irrigation were built. These projects depend on gravity flow or pumping. Starting from Jazeera project then small projects downstream Fatah, where these feed by pumping. After Samarra scheme, the important Ishaqi project, then after Baghdad, the projects of Nahrawan, Middle-Tigris and Dalmaj. The most important branch from Tigris is Gharraf Canal, which is not exploited yet, although plans were prepared decades ago. Downstream Kut Barrage, several projects are especially on the right side of Tigris. Finally, Shatt Al-Arab project which has a unique importance as it provide the solution for municipal need and save the orchards of dates in Basra.  </p>
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