Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876886
I. Hamzaoui, F. Bouchafaa, A. Hadjammar, A. Talha
The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated. There are two families from control structures, the strategy from maximizing the power with and without velocity control. The aim of this paper is to evaluate the performances of two types of MPPT controllers mentioned on an 7.5 kW test bench containing a DFIG and we interested to compare this two strategies from maximizing the power extracted for a wind generation system with a horizontal axis The corresponding simulation model are described in section III. The studied MPPT controllers are presented results are given, analyzed and discussed in part in part IV. Finally, In last part, extracts some conclusions on this paper.
{"title":"Improvement of the performances MPPT system of wind generation","authors":"I. Hamzaoui, F. Bouchafaa, A. Hadjammar, A. Talha","doi":"10.1109/SIECPC.2011.5876886","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876886","url":null,"abstract":"The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated. There are two families from control structures, the strategy from maximizing the power with and without velocity control. The aim of this paper is to evaluate the performances of two types of MPPT controllers mentioned on an 7.5 kW test bench containing a DFIG and we interested to compare this two strategies from maximizing the power extracted for a wind generation system with a horizontal axis The corresponding simulation model are described in section III. The studied MPPT controllers are presented results are given, analyzed and discussed in part in part IV. Finally, In last part, extracts some conclusions on this paper.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127209922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876923
L. Botha, C. Kitching, Ali Almsallam
Modern experimental radar systems that are used for advanced research into persistent surveillance and topics such as high range resolution need an ultra wide bandwidth of several hundred megahertz. There is furthermore a requirement for a high Spurious Free Dynamic Range (SFDR). This presents a unique challenge to the designer of the receiver- and exciter system. This paper presents the design challenges and one solution to these challenges.
{"title":"The design of experimental radar REX: Ultra high bandwidth receiver and exciter design","authors":"L. Botha, C. Kitching, Ali Almsallam","doi":"10.1109/SIECPC.2011.5876923","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876923","url":null,"abstract":"Modern experimental radar systems that are used for advanced research into persistent surveillance and topics such as high range resolution need an ultra wide bandwidth of several hundred megahertz. There is furthermore a requirement for a high Spurious Free Dynamic Range (SFDR). This presents a unique challenge to the designer of the receiver- and exciter system. This paper presents the design challenges and one solution to these challenges.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125991713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876988
M. Al-Khalidy
The main contribution of this paper is to present and discusses a new approach for development of a kinematics model and control strategy for a Nonholonomic Wheeled Mobile Robot WMR. Dynamic model is involved, the linearization of the model is also presented, and stability analysis is discussed. Extensive simulation results for the proposed controller are presented.
{"title":"Nonholonomic Wheeled Mobile Robot modeling and development","authors":"M. Al-Khalidy","doi":"10.1109/SIECPC.2011.5876988","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876988","url":null,"abstract":"The main contribution of this paper is to present and discusses a new approach for development of a kinematics model and control strategy for a Nonholonomic Wheeled Mobile Robot WMR. Dynamic model is involved, the linearization of the model is also presented, and stability analysis is discussed. Extensive simulation results for the proposed controller are presented.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126329743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876959
E. Akhouayri, E. Hassan, Ait Laasri, D. Agliz, A. Atmani
Automatic testing of stationarity and detecting of its abrupt change are of primary importance in numerous applications ranging from exploratory data analysis to diagnosis or surveillance. In which case, we are interested in points where the signal stationarity is violated. We consider the problem of how to detect these change-points, which we identify by finding sharp changes in the signal characteristics. Several different methods are considered. Here we suggest a method for detecting and picking these abrupt changes automatically. We divide a record into intervals of equal lengths and check the "local stationarity" between two consecutive intervals by using cross correlation. Because of its ability to accentuate abrupt changes in the signal frequency, it can be effectively employed to detect weak signals in a stationary noise background. In this paper we demonstrate the technique on the problem of detecting and picking P-arrival phase seismic. The intervals have approximately the same characteristics when these include only background noise. But, the similarity breaks abruptly when a seismic signal arrives. This break of similarity makes us possible to detect P-wave arrival. Because the method can detect changes both in frequency and amplitude we can use it on a basic problem in seismic data analysis, which is recognition of weak signals in the presence of ambient noise.
{"title":"Signal stationarity testing and detecting of its abrupt change","authors":"E. Akhouayri, E. Hassan, Ait Laasri, D. Agliz, A. Atmani","doi":"10.1109/SIECPC.2011.5876959","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876959","url":null,"abstract":"Automatic testing of stationarity and detecting of its abrupt change are of primary importance in numerous applications ranging from exploratory data analysis to diagnosis or surveillance. In which case, we are interested in points where the signal stationarity is violated. We consider the problem of how to detect these change-points, which we identify by finding sharp changes in the signal characteristics. Several different methods are considered. Here we suggest a method for detecting and picking these abrupt changes automatically. We divide a record into intervals of equal lengths and check the \"local stationarity\" between two consecutive intervals by using cross correlation. Because of its ability to accentuate abrupt changes in the signal frequency, it can be effectively employed to detect weak signals in a stationary noise background. In this paper we demonstrate the technique on the problem of detecting and picking P-arrival phase seismic. The intervals have approximately the same characteristics when these include only background noise. But, the similarity breaks abruptly when a seismic signal arrives. This break of similarity makes us possible to detect P-wave arrival. Because the method can detect changes both in frequency and amplitude we can use it on a basic problem in seismic data analysis, which is recognition of weak signals in the presence of ambient noise.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127383556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876970
K. Cahyorini, K. Indriana, Narsito
Dye-sensitized solar cells (DSSCs) are being a potential technology for application in solar energy and photovoltaic processes. Its light harvesting and photocurrent generation are highly dependent on the nanostructured semiconductor film and the mode of dye adsorption. The N-doped TiO2 with mesoporous structure, which synthesized through one step templating sol gel method using amine group containing surfactant, was used as semiconductor material. The ruthenium polypirydine complex that contain carboxylic anchoring group was used as dye sensitizer. The dye adsorption process has been performed in situ, stepwise, and directly on the surface of the N-doped TiO2 film. FTIR spectrophotometer is used to study the surface interactions of Ru complex with N-doped TiO2 surface. The result showed that the coordination of Ru-complex on N-doped TiO2 film occurs mainly by the contribution of unidentate (i.e., ester-like linkage) and partially by bidentate linkage. The absorption spectrum, IPCE and I-V curve were used to study the efficiency of in situ adsorption process in DSSCs, providing fill factor (ff) 64 % IPCE and overall DSSCs (77) efficiency 6.5%.
{"title":"Dye-sensitized solar cells based on in situ sensitized of nitrogen doped TiO2","authors":"K. Cahyorini, K. Indriana, Narsito","doi":"10.1109/SIECPC.2011.5876970","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876970","url":null,"abstract":"Dye-sensitized solar cells (DSSCs) are being a potential technology for application in solar energy and photovoltaic processes. Its light harvesting and photocurrent generation are highly dependent on the nanostructured semiconductor film and the mode of dye adsorption. The N-doped TiO2 with mesoporous structure, which synthesized through one step templating sol gel method using amine group containing surfactant, was used as semiconductor material. The ruthenium polypirydine complex that contain carboxylic anchoring group was used as dye sensitizer. The dye adsorption process has been performed in situ, stepwise, and directly on the surface of the N-doped TiO2 film. FTIR spectrophotometer is used to study the surface interactions of Ru complex with N-doped TiO2 surface. The result showed that the coordination of Ru-complex on N-doped TiO2 film occurs mainly by the contribution of unidentate (i.e., ester-like linkage) and partially by bidentate linkage. The absorption spectrum, IPCE and I-V curve were used to study the efficiency of in situ adsorption process in DSSCs, providing fill factor (ff) 64 % IPCE and overall DSSCs (77) efficiency 6.5%.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122409075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wireless Sensor Networks (WSN) are low power networks which have many small nodes. The nodes are low power sensors interconnected to each other to receive and transmit data from source to sink. By the transferring of data, the power of these nodes reduces and eventually the system dies. In this paper we introduce an efficient load sharing routing technique to increase the life time of all the nodes in a way to get maximum efficiency from the network. The routing algorithms such as link state which are used for wireless sensor networks prefer to choose a low cost path to decrease the transmission time but they do not consider the power of nodes for transmission which sometimes result in reduction of a lifetime of a network. We modify the previous method by saving the power of each node. A critical power is defined for a network and a node with power less than critical value is operated in power saving mode and is used only if there is no other substitute path available. A node in power saving mode set the cost of all the connected links to a very large value. When link state algorithm is applied on modified network, it is highly unlikely to get a low cost path with inclusion of such node unless a destination has only one path that includes this low power node. A computer simulation is performed to evaluate the performance of proposed algorithm. Our result clearly indicates an increase in lifetime of a network.
{"title":"Efficient load sharing routing algorithm to increase lifetime of Wireless Sensor Networks","authors":"Asjad Amin, Waqar Mehbob, Arslan Haider Ranjha, Hasnain Abbas, Nadeem Abbas, Waqas Anjum","doi":"10.1109/SIECPC.2011.5876920","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876920","url":null,"abstract":"Wireless Sensor Networks (WSN) are low power networks which have many small nodes. The nodes are low power sensors interconnected to each other to receive and transmit data from source to sink. By the transferring of data, the power of these nodes reduces and eventually the system dies. In this paper we introduce an efficient load sharing routing technique to increase the life time of all the nodes in a way to get maximum efficiency from the network. The routing algorithms such as link state which are used for wireless sensor networks prefer to choose a low cost path to decrease the transmission time but they do not consider the power of nodes for transmission which sometimes result in reduction of a lifetime of a network. We modify the previous method by saving the power of each node. A critical power is defined for a network and a node with power less than critical value is operated in power saving mode and is used only if there is no other substitute path available. A node in power saving mode set the cost of all the connected links to a very large value. When link state algorithm is applied on modified network, it is highly unlikely to get a low cost path with inclusion of such node unless a destination has only one path that includes this low power node. A computer simulation is performed to evaluate the performance of proposed algorithm. Our result clearly indicates an increase in lifetime of a network.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123920806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876901
M. Saleem, K. Karimov, M. Saeed
In this paper, the experimental results on the investigation of electric properties of organic semiconductor resistance strain sensors based on quasi-one dimensional ion-radical salts of tetracyanoquinodimethane and three phenyl methyl phosphonium [Ph3MeP(TCNQ)2] are described. It was observed that the sensitivity of the resistance strain sensors based on twinned crystals is significantly larger than that of uniform crystals.
{"title":"Resistance strain sensors based on quasi-one-dimension Ph3MeP(TCNQ)2 crystals","authors":"M. Saleem, K. Karimov, M. Saeed","doi":"10.1109/SIECPC.2011.5876901","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876901","url":null,"abstract":"In this paper, the experimental results on the investigation of electric properties of organic semiconductor resistance strain sensors based on quasi-one dimensional ion-radical salts of tetracyanoquinodimethane and three phenyl methyl phosphonium [Ph3MeP(TCNQ)2] are described. It was observed that the sensitivity of the resistance strain sensors based on twinned crystals is significantly larger than that of uniform crystals.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124012212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5877014
Hussam A. Kloub, Casey Smith, M. Hussain
We present a design, simulation results and fabrication of electromechanical switches enabling parallel data processing and multi functionality. The device is applied in logic gates AND, NOR, XNOR, and Flip-Flops. The device footprint size is 2μm by 0.5μm, and has a pull-in voltage of 5.15V which is verified by FEM simulation.
{"title":"Multi states electromechanical switch for energy efficient parallel data processing","authors":"Hussam A. Kloub, Casey Smith, M. Hussain","doi":"10.1109/SIECPC.2011.5877014","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5877014","url":null,"abstract":"We present a design, simulation results and fabrication of electromechanical switches enabling parallel data processing and multi functionality. The device is applied in logic gates AND, NOR, XNOR, and Flip-Flops. The device footprint size is 2μm by 0.5μm, and has a pull-in voltage of 5.15V which is verified by FEM simulation.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124205259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876975
Mohammed Alansi, I. Elshafiey, A. Al-Sanie
This paper investigates the implementation scenario of Space Division Multiple Access(SDMA) which is a notable application of Multiple Input Multiple Output(MIMO) system. SDMA is one of the most promising techniques aiming at solving the capacity problem of wireless communication systems and achieving higher spectral efficiency, depending on multiplexing signals based on their spatial signature. This paper presents of combining SDMA combined with the Orthogonal Frequency Division Multiplexing (OFDM). Various SDMA techniques are investigated including linear detection schemes, minimum mean square error, ordered successive cancellation, and maximum likelihood methods. Promising results are obtained to enhance spectral efficiency on the expense of computational complexity which needs to be addressed.
{"title":"Multi user detection for SDMA OFDM communication systems","authors":"Mohammed Alansi, I. Elshafiey, A. Al-Sanie","doi":"10.1109/SIECPC.2011.5876975","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876975","url":null,"abstract":"This paper investigates the implementation scenario of Space Division Multiple Access(SDMA) which is a notable application of Multiple Input Multiple Output(MIMO) system. SDMA is one of the most promising techniques aiming at solving the capacity problem of wireless communication systems and achieving higher spectral efficiency, depending on multiplexing signals based on their spatial signature. This paper presents of combining SDMA combined with the Orthogonal Frequency Division Multiplexing (OFDM). Various SDMA techniques are investigated including linear detection schemes, minimum mean square error, ordered successive cancellation, and maximum likelihood methods. Promising results are obtained to enhance spectral efficiency on the expense of computational complexity which needs to be addressed.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116382939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876887
Md Anowar Hossain, I. Elshafiey, M. Alkanhal, A. Mabrouk
This paper presents an empirical study of high resolution potentially jamming-resistant Synthetic Aperture Radar (SAR) system based on UWB-OFDM architecture. The Range-Doppler Algorithm (RDA) was used to construct a high resolution SAR image for simulation purpose. Suitable waveforms to achieve high resolution SAR imaging are proposed for both friendly and hostile environments. The proposed waveforms were tested for a point scatterer and for full 2-D SAR image construction. Simulation results demonstrate the benefits of using UWB-OFDM waveforms for SAR system, such as dynamic spectrum allocation, antijamming potential through pulse diversity-while having a potential to produce high resolution target images. The use of UWB-OFDM waveform for SAR system proves useful for high resolution image data collection for civilian purposes and provides significant anti-jamming capabilities for military purposes.
{"title":"Adaptive UWB-OFDM Synthetic Aperture Radar","authors":"Md Anowar Hossain, I. Elshafiey, M. Alkanhal, A. Mabrouk","doi":"10.1109/SIECPC.2011.5876887","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876887","url":null,"abstract":"This paper presents an empirical study of high resolution potentially jamming-resistant Synthetic Aperture Radar (SAR) system based on UWB-OFDM architecture. The Range-Doppler Algorithm (RDA) was used to construct a high resolution SAR image for simulation purpose. Suitable waveforms to achieve high resolution SAR imaging are proposed for both friendly and hostile environments. The proposed waveforms were tested for a point scatterer and for full 2-D SAR image construction. Simulation results demonstrate the benefits of using UWB-OFDM waveforms for SAR system, such as dynamic spectrum allocation, antijamming potential through pulse diversity-while having a potential to produce high resolution target images. The use of UWB-OFDM waveform for SAR system proves useful for high resolution image data collection for civilian purposes and provides significant anti-jamming capabilities for military purposes.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114250432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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