The Experts below are selected from a list of 81 Experts worldwide ranked by ideXlab platform
Tamer Elbatt - One of the best experts on this subject based on the ideXlab platform.
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stability analysis of slotted aloha with opportunistic rf energy harvesting
IEEE Journal on Selected Areas in Communications, 2016Co-Authors: Abdelrahman M Ibrahim, Ozgur Ercetin, Tamer ElbattAbstract:Energy harvesting (EH) is a promising technology for realizing energy-efficient wireless networks. In this paper, we utilize the ambient RF energy, particularly interference from neighboring transmissions, to replenish the batteries of the EH enabled nodes. However, RF energy harvesting imposes new challenges into the analysis of wireless networks. Our objective in this paper is to investigate the performance of a slotted Aloha random access wireless network consisting of two types of nodes, namely Type I, which has unlimited energy supply and Type II, which is solely powered by an RF energy harvesting circuit. The transmissions of a Type I node are recycled by a Type II node to replenish its Battery. We characterize an inner bound on the stable throughput region under half-duplex and full-duplex energy harvesting paradigms as well as for the finite capacity Battery Case. Additionally, we analyze the Case where RF energy harvesting serves as a backup for an unlimited energy source. We present numerical results that validate our analytical results, and demonstrate their utility for the analysis of the exact system.
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stability analysis of slotted aloha with opportunistic rf energy harvesting
arXiv: Networking and Internet Architecture, 2015Co-Authors: Abdelrahman M Ibrahim, Ozgur Ercetin, Tamer ElbattAbstract:Energy harvesting (EH) is a promising technology for realizing energy efficient wireless networks. In this paper, we utilize the ambient RF energy, particularly interference from neighboring transmissions, to replenish the batteries of the EH enabled nodes. However, RF energy harvesting imposes new challenges into the analysis of wireless networks. Our objective in this work is to investigate the performance of a slotted Aloha random access wireless network consisting of two types of nodes, namely Type I which has unlimited energy supply and Type II which is solely powered by an RF energy harvesting circuit. The transmissions of a Type I node are recycled by a Type II node to replenish its Battery. We characterize an inner bound on the stable throughput region under half-duplex and full-duplex energy harvesting paradigms as well as for the finite capacity Battery Case. We present numerical results that validate our analytical results, and demonstrate their utility for the analysis of the exact system.
Irina Masalova - One of the best experts on this subject based on the ideXlab platform.
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a degradation study of isotactic virgin and recycled polypropylene used in lead acid Battery casings
Polymer Testing, 2006Co-Authors: N. Rust, E.e. Ferg, Irina MasalovaAbstract:Polypropylene has become a great concern with regards to environmental pollution since it is generally resistant to normal conditions of degradation. This factor has encouraged the industry to find ways to regenerate spent polypropylene. A good example of such a process is the recycling of lead acid batteries. The use of recycled polypropylene has cost saving implications, but does have a disadvantage in that the material starts to deteriorate after multiple processes. The comparative study investigated the use of various ratios of virgin and different grades of recycled PP in the manufacturing of lead acid Battery Cases and their influence on its physical and chemical properties. The degradation of PP was also investigated as the material was subjected to multiple manufacturing processes where the influence of stabilizers was considered. A common technique used for the analysis of PP, MFI was shown to be an effective technique to maintain a good quality control system within the Battery Case manufacturing process. The study further showed that it is important to maintain a compatible grade of PP for both the Battery Case and lid in order to allow for effective heat sealing of the two components.
E.e. Ferg - One of the best experts on this subject based on the ideXlab platform.
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A correlation between the variable melt flow index and the molecular mass distribution of virgin and recycled polypropylene used in the manufacturing of Battery Cases
Polymer Testing, 2013Co-Authors: E.e. Ferg, L.l. BoloAbstract:Abstract This study looked at establishing a correlation between the variable melt flow index (VMFI) values of molten polypropylene (PP) with different piston-load masses using a standard MFI analyser. The study was done using virgin PP and recycled PP obtained from recycling Pb-acid batteries. The study showed that the results would fit a suitable power function equation where the size of the exponent reflects the increase in flow characteristics of the polymer with increased piston-load mass. The established correlation was then compared to the average molecular weight distribution of virgin PP determined by gel permeation chromatography (GPC). Good agreement was obtained for the range of grades of virgin PP samples that correlated well with the Mark-Houwink power law where the inverse of the MFI (1/MFI) would be proportional to the average molecular weight to the power of 3.4 (Mw 3.4 ). GPC analysis cannot be effectively used to study recycled PP, where a number of factors can influence the melt flow properties such as fillers, impurities and the presence of polyethylene in the polymer matrix. Instead, a comparative understanding of the flow behaviour of recycled PP to that of virgin PP was done by using the VMFI method to possibly show the dissimilar polymer melt flow behaviour of using virgin and recycled PP material in injection moulding of new Battery Cases and lids, or when attempting to seal the lid to the Battery Case during manufacturing.
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a degradation study of isotactic virgin and recycled polypropylene used in lead acid Battery casings
Polymer Testing, 2006Co-Authors: N. Rust, E.e. Ferg, Irina MasalovaAbstract:Polypropylene has become a great concern with regards to environmental pollution since it is generally resistant to normal conditions of degradation. This factor has encouraged the industry to find ways to regenerate spent polypropylene. A good example of such a process is the recycling of lead acid batteries. The use of recycled polypropylene has cost saving implications, but does have a disadvantage in that the material starts to deteriorate after multiple processes. The comparative study investigated the use of various ratios of virgin and different grades of recycled PP in the manufacturing of lead acid Battery Cases and their influence on its physical and chemical properties. The degradation of PP was also investigated as the material was subjected to multiple manufacturing processes where the influence of stabilizers was considered. A common technique used for the analysis of PP, MFI was shown to be an effective technique to maintain a good quality control system within the Battery Case manufacturing process. The study further showed that it is important to maintain a compatible grade of PP for both the Battery Case and lid in order to allow for effective heat sealing of the two components.
Abdelrahman M Ibrahim - One of the best experts on this subject based on the ideXlab platform.
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stability analysis of slotted aloha with opportunistic rf energy harvesting
IEEE Journal on Selected Areas in Communications, 2016Co-Authors: Abdelrahman M Ibrahim, Ozgur Ercetin, Tamer ElbattAbstract:Energy harvesting (EH) is a promising technology for realizing energy-efficient wireless networks. In this paper, we utilize the ambient RF energy, particularly interference from neighboring transmissions, to replenish the batteries of the EH enabled nodes. However, RF energy harvesting imposes new challenges into the analysis of wireless networks. Our objective in this paper is to investigate the performance of a slotted Aloha random access wireless network consisting of two types of nodes, namely Type I, which has unlimited energy supply and Type II, which is solely powered by an RF energy harvesting circuit. The transmissions of a Type I node are recycled by a Type II node to replenish its Battery. We characterize an inner bound on the stable throughput region under half-duplex and full-duplex energy harvesting paradigms as well as for the finite capacity Battery Case. Additionally, we analyze the Case where RF energy harvesting serves as a backup for an unlimited energy source. We present numerical results that validate our analytical results, and demonstrate their utility for the analysis of the exact system.
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stability analysis of slotted aloha with opportunistic rf energy harvesting
arXiv: Networking and Internet Architecture, 2015Co-Authors: Abdelrahman M Ibrahim, Ozgur Ercetin, Tamer ElbattAbstract:Energy harvesting (EH) is a promising technology for realizing energy efficient wireless networks. In this paper, we utilize the ambient RF energy, particularly interference from neighboring transmissions, to replenish the batteries of the EH enabled nodes. However, RF energy harvesting imposes new challenges into the analysis of wireless networks. Our objective in this work is to investigate the performance of a slotted Aloha random access wireless network consisting of two types of nodes, namely Type I which has unlimited energy supply and Type II which is solely powered by an RF energy harvesting circuit. The transmissions of a Type I node are recycled by a Type II node to replenish its Battery. We characterize an inner bound on the stable throughput region under half-duplex and full-duplex energy harvesting paradigms as well as for the finite capacity Battery Case. We present numerical results that validate our analytical results, and demonstrate their utility for the analysis of the exact system.
N. Rust - One of the best experts on this subject based on the ideXlab platform.
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a degradation study of isotactic virgin and recycled polypropylene used in lead acid Battery casings
Polymer Testing, 2006Co-Authors: N. Rust, E.e. Ferg, Irina MasalovaAbstract:Polypropylene has become a great concern with regards to environmental pollution since it is generally resistant to normal conditions of degradation. This factor has encouraged the industry to find ways to regenerate spent polypropylene. A good example of such a process is the recycling of lead acid batteries. The use of recycled polypropylene has cost saving implications, but does have a disadvantage in that the material starts to deteriorate after multiple processes. The comparative study investigated the use of various ratios of virgin and different grades of recycled PP in the manufacturing of lead acid Battery Cases and their influence on its physical and chemical properties. The degradation of PP was also investigated as the material was subjected to multiple manufacturing processes where the influence of stabilizers was considered. A common technique used for the analysis of PP, MFI was shown to be an effective technique to maintain a good quality control system within the Battery Case manufacturing process. The study further showed that it is important to maintain a compatible grade of PP for both the Battery Case and lid in order to allow for effective heat sealing of the two components.
