Pub Date : 2021-01-01DOI: 10.1080/20909977.2020.1868658
J. Amigun, O. A. Akinleye-Martins
ABSTRACT In hydrocarbon exploration, fractures act as possible pathways for hydrocarbon flow especially in low-permeable siliciclastic reservoirs and carbonate reservoir layers. These fractures on typical seismic section are designatesub-seismic scale structures, occur below seismic resolution and thus difficult to detect on seismic section. This study aims to predict and characterise sub-seismic scale fractures within low-permeability siliciclastic reservoirs of Agbada Formation in “Kin” Field onshore Niger Delta basin by using discontinuity attributes i.e. similarity and curvature. The input seismic data of the study field was initially conditioned using the dip steering algorithm to improve the image quality of fractures in the data. Time-slices were extracted within the horizons of interest for seismic attribute analysis. Conventional log from porosity density was used to validate the interpreted fractures within the borehole environment. The attribute analyses result at time-slices 2024 ms, 2100 ms and 2197 ms show subtle features i.e. fractures with predominant trends NW – SE and NE – SW. A multi-attribute analysis was performed to optimise fractures prediction. Further results show relatively high fracture density at the western central and south eastern regions of the study area. Therefore, these regions could be inferred as potential hydrocarbon zones and locations for future wells placement.
{"title":"3D seismic discontinuity attributes analyses for low – permeability reservoir sand fractures characterisation: an onshore example from Niger delta, Nigeria","authors":"J. Amigun, O. A. Akinleye-Martins","doi":"10.1080/20909977.2020.1868658","DOIUrl":"https://doi.org/10.1080/20909977.2020.1868658","url":null,"abstract":"ABSTRACT In hydrocarbon exploration, fractures act as possible pathways for hydrocarbon flow especially in low-permeable siliciclastic reservoirs and carbonate reservoir layers. These fractures on typical seismic section are designatesub-seismic scale structures, occur below seismic resolution and thus difficult to detect on seismic section. This study aims to predict and characterise sub-seismic scale fractures within low-permeability siliciclastic reservoirs of Agbada Formation in “Kin” Field onshore Niger Delta basin by using discontinuity attributes i.e. similarity and curvature. The input seismic data of the study field was initially conditioned using the dip steering algorithm to improve the image quality of fractures in the data. Time-slices were extracted within the horizons of interest for seismic attribute analysis. Conventional log from porosity density was used to validate the interpreted fractures within the borehole environment. The attribute analyses result at time-slices 2024 ms, 2100 ms and 2197 ms show subtle features i.e. fractures with predominant trends NW – SE and NE – SW. A multi-attribute analysis was performed to optimise fractures prediction. Further results show relatively high fracture density at the western central and south eastern regions of the study area. Therefore, these regions could be inferred as potential hydrocarbon zones and locations for future wells placement.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"18 1","pages":"58 - 69"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89534664","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 : 2021-01-01DOI: 10.1080/20909977.2021.1907963
Mohamed El Bohoty, A. Khalil, Wahed Hassan, A. El-Kotb, A. Awad, Mohamed Khalifa
ABSTRACT The purpose of the current paper is to investigate the subsurface geological active structures, through the analysis of the magnetic data, to conduct a scientific evaluation of the infrastructure of the area surrounding the new port of Jarjob that located on the northern coast about 60 km from the city of Marsa Matruh towards the city of Salloum and sited in the vicinity of the proposed area. The Magnetic data comprise the RTP aeromagnetic map as well as the resulting map from the geomagnetic survey for the part that was chosen in the proposed area. Two Overhauser Magnetometers are used to make a detailed comprehensive land magnetic survey, while the aeromagnetic map is obtained with authorisation from the General Petroleum Company. The necessary reduction-filtering phases like the daily variation, regional gradient, and the time variation are applied to obtain the total intensity anomaly map. Resulting total land magnetic intensity map is then reduced to the north magnetic pole and followed by the application of filtering linear wavelength technique to RTP aeromagnetic map and RTP land magnetic map to isolated the shallower residual components using different grid intervals. The obtained major tectonic trends of the study area show that the regional structures are controlled by the regional deeper structure taken NE-SW and E-W directions. The average calculated depth to the basement surface ranges from 2.6 to 3.2 km. So, the strength and solidity of the infrastructure of the port area, especially land magnetic survey area being studied that occupies a privileged place, which overlooks directly on the port coast and close to the main building, makes it a candidate for the establishment of industrial and economic projects and logistical services in the port.
{"title":"Geophysical study of subsurface structures of the area surrounding the new port of Jarjob in El-Negila-Marsa Matruh using magnetic data","authors":"Mohamed El Bohoty, A. Khalil, Wahed Hassan, A. El-Kotb, A. Awad, Mohamed Khalifa","doi":"10.1080/20909977.2021.1907963","DOIUrl":"https://doi.org/10.1080/20909977.2021.1907963","url":null,"abstract":"ABSTRACT The purpose of the current paper is to investigate the subsurface geological active structures, through the analysis of the magnetic data, to conduct a scientific evaluation of the infrastructure of the area surrounding the new port of Jarjob that located on the northern coast about 60 km from the city of Marsa Matruh towards the city of Salloum and sited in the vicinity of the proposed area. The Magnetic data comprise the RTP aeromagnetic map as well as the resulting map from the geomagnetic survey for the part that was chosen in the proposed area. Two Overhauser Magnetometers are used to make a detailed comprehensive land magnetic survey, while the aeromagnetic map is obtained with authorisation from the General Petroleum Company. The necessary reduction-filtering phases like the daily variation, regional gradient, and the time variation are applied to obtain the total intensity anomaly map. Resulting total land magnetic intensity map is then reduced to the north magnetic pole and followed by the application of filtering linear wavelength technique to RTP aeromagnetic map and RTP land magnetic map to isolated the shallower residual components using different grid intervals. The obtained major tectonic trends of the study area show that the regional structures are controlled by the regional deeper structure taken NE-SW and E-W directions. The average calculated depth to the basement surface ranges from 2.6 to 3.2 km. So, the strength and solidity of the infrastructure of the port area, especially land magnetic survey area being studied that occupies a privileged place, which overlooks directly on the port coast and close to the main building, makes it a candidate for the establishment of industrial and economic projects and logistical services in the port.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"53 1","pages":"218 - 234"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85820454","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 : 2021-01-01DOI: 10.1080/20909977.2021.1913364
S. A. A. S. Araffa, M. Abdelazeem, Hassan S. S. Sabet, Ahmed M. M. Al Dabour
ABSTRACT El Moghra area represents a vital part of the national reclamation area at the northern part of Western Desert, Egypt. Delineating subsurface structures (faults & basins) and depth to the basement is the base of planning the area. Basins can be water aquifers or oil traps. Gravity data has been used to tackle such aims. The gravity (Bouguer) anomaly map is separated into regional components (deep sources), and residual component (shallower sources). The residual gravity map was used to delineate subsurface structural features dissecting the investigated area. Also, Euler deconvolution and Tilt Derivative methods have been used for delineating the structural elements. The gravity interpretation indicates that the most main tectonic have E–W, ENE–WSW, and N–S trends for the major structures, while the minor structures are aligned in NNE–SSW, NE–SW, NNW–SSE, and NW–SE. The results of depth estimation using 2D and 3D modelling show that the eastern and southwestern parts of the area under study exhibit a deep basement structure, reaches more than 7000 m (basin). However, the central and northwestern parts of the investigated area show shallower depth of basement rocks (4100 m).
El Moghra地区是埃及西部沙漠北部国家垦区的重要组成部分。圈定地下构造(断层、盆地)及基底深度是该区规划的基础。盆地可以是含水层或油层。重力数据已经被用来实现这些目标。将重力(布格)异常图划分为区域分量(深层源)和残差分量(浅层源)。利用残差重力图对研究区进行了地下构造特征圈定。此外，欧拉反褶积和倾斜导数方法已被用于描绘结构元素。重力解释表明，大部分主要构造具有E-W、ENE-WSW和N-S走向，次要构造呈NNE-SSW、NE-SW、NNW-SSE和NW-SE走向。二维和三维模型深度估算结果表明，研究区东部和西南部为深基底构造，深度超过7000 m(盆地)。然而，调查区中部和西北部基底岩深度较浅(4100 m)。
{"title":"Gravity interpretation for delineating subsurface structures and depth of basement at El Moghra area, North Western Desert, Egypt","authors":"S. A. A. S. Araffa, M. Abdelazeem, Hassan S. S. Sabet, Ahmed M. M. Al Dabour","doi":"10.1080/20909977.2021.1913364","DOIUrl":"https://doi.org/10.1080/20909977.2021.1913364","url":null,"abstract":"ABSTRACT El Moghra area represents a vital part of the national reclamation area at the northern part of Western Desert, Egypt. Delineating subsurface structures (faults & basins) and depth to the basement is the base of planning the area. Basins can be water aquifers or oil traps. Gravity data has been used to tackle such aims. The gravity (Bouguer) anomaly map is separated into regional components (deep sources), and residual component (shallower sources). The residual gravity map was used to delineate subsurface structural features dissecting the investigated area. Also, Euler deconvolution and Tilt Derivative methods have been used for delineating the structural elements. The gravity interpretation indicates that the most main tectonic have E–W, ENE–WSW, and N–S trends for the major structures, while the minor structures are aligned in NNE–SSW, NE–SW, NNW–SSE, and NW–SE. The results of depth estimation using 2D and 3D modelling show that the eastern and southwestern parts of the area under study exhibit a deep basement structure, reaches more than 7000 m (basin). However, the central and northwestern parts of the investigated area show shallower depth of basement rocks (4100 m).","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"12 2 1","pages":"270 - 278"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91071482","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 : 2021-01-01DOI: 10.1080/20909977.2020.1870789
M. Youssef
ABSTRACT In the present paper, the properties of more energetic coronal mass ejections (ECMEs) (kinetic energy ≥1E + 30 ergs) observed between the years from 1996 to 2006 were studied. Through this period and under certain time-based and spatial conditions 253 Flare-ECMEs were selected . These 253 energetic CME-Flare events separated into two groups according to their time of detection, Before Flare-ECME events and After Flare–ECME event. This study indicates that the mean CME width for both before and after Flare-ECMEs are 90 and 100 degrees, respectively. Also, it was found that the before Flare-ECMEs are in average faster than the after Flare-ECMEs. The results show also both before and after Flare-ECMEs are wider than other CMEs. Besides it was found that the before Flare-ECMEs are in average faster than the after Flare-ECMEs, while the after Flare-ECMEs are in average more massive than before Flare – ECMEs. Finally it was found that both after and before Flare-ECMEs has negative mean acceleration.
{"title":"On Properties of Energetic Coronal Mass - Flare Events","authors":"M. Youssef","doi":"10.1080/20909977.2020.1870789","DOIUrl":"https://doi.org/10.1080/20909977.2020.1870789","url":null,"abstract":"ABSTRACT In the present paper, the properties of more energetic coronal mass ejections (ECMEs) (kinetic energy ≥1E + 30 ergs) observed between the years from 1996 to 2006 were studied. Through this period and under certain time-based and spatial conditions 253 Flare-ECMEs were selected . These 253 energetic CME-Flare events separated into two groups according to their time of detection, Before Flare-ECME events and After Flare–ECME event. This study indicates that the mean CME width for both before and after Flare-ECMEs are 90 and 100 degrees, respectively. Also, it was found that the before Flare-ECMEs are in average faster than the after Flare-ECMEs. The results show also both before and after Flare-ECMEs are wider than other CMEs. Besides it was found that the before Flare-ECMEs are in average faster than the after Flare-ECMEs, while the after Flare-ECMEs are in average more massive than before Flare – ECMEs. Finally it was found that both after and before Flare-ECMEs has negative mean acceleration.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"2015 1","pages":"70 - 75"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82765008","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 : 2021-01-01DOI: 10.1080/20909977.2021.1938884
M.L. Eladawy, H. A. Basset, M. Morsy, M. Korany
ABSTRACT Climatological spatiotemporal variability of global solar radiation (GSR) and its trend analysis, fluctuations and abrupt changes based on seven sites (Cairo, Arish, Barrani, Matrouh, Aswan, Asyut, Kharga) in Egypt were studied during the period 1985–2018. Fifth-generation dataset of European Center for Medium-Range Weather Forecasts (ECMWF) reanalysis of the global climate and weather for the past 4 to 7 decades (ERA5) data after validation with available observed GSR data has been used. Monthly, seasonal and annual GSR values have marked variations. The results revealed that the highest values of coefficient of variation occurred at stations in winter, while the lowest values occurred in summer. Moreover, in winter and spring, all stations presented a positive Mann-Kendell (MK) trend and almost all stations in annual except Aswan, Asyut and Kharga, whereas in autumn, all station presented a negative MK trend, summer in all stations except Barrani and Cairo. The fluctuations in the annual GSR were investigated using the cumulative sum charts (CUSUM) method, where all stations have alternating trend between negative and positive CUSUM along period.
{"title":"Study of trend and fluctuations of global solar radiation over Egypt","authors":"M.L. Eladawy, H. A. Basset, M. Morsy, M. Korany","doi":"10.1080/20909977.2021.1938884","DOIUrl":"https://doi.org/10.1080/20909977.2021.1938884","url":null,"abstract":"ABSTRACT Climatological spatiotemporal variability of global solar radiation (GSR) and its trend analysis, fluctuations and abrupt changes based on seven sites (Cairo, Arish, Barrani, Matrouh, Aswan, Asyut, Kharga) in Egypt were studied during the period 1985–2018. Fifth-generation dataset of European Center for Medium-Range Weather Forecasts (ECMWF) reanalysis of the global climate and weather for the past 4 to 7 decades (ERA5) data after validation with available observed GSR data has been used. Monthly, seasonal and annual GSR values have marked variations. The results revealed that the highest values of coefficient of variation occurred at stations in winter, while the lowest values occurred in summer. Moreover, in winter and spring, all stations presented a positive Mann-Kendell (MK) trend and almost all stations in annual except Aswan, Asyut and Kharga, whereas in autumn, all station presented a negative MK trend, summer in all stations except Barrani and Cairo. The fluctuations in the annual GSR were investigated using the cumulative sum charts (CUSUM) method, where all stations have alternating trend between negative and positive CUSUM along period.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"8 1","pages":"372 - 386"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72907201","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 : 2021-01-01DOI: 10.1080/20909977.2021.1979890
Mahmoud Ahmed Ibrahim, A. Othman, Sultan Awed Sultan Araffa, Mohamed Said Mebed, M. Abu Bakr
ABSTRACT The present study aims to identify the geologic structure of the Abu Dabbab area. The previous work state that the study area contains different ore minerals such as Tantalum, Niobium, Cassiterite, Gold, and sulphides. Processing, analysis, and interpretation of aeromagnetic and recorded seismic events data of the study area were to define the seismic activity zones and the main trend in the study area and its relation with ore deposits distribution. The area is controlled by different structural elements of trends NE-SW, NNW-SSE, and E-W. The results indicated that most of ore deposits are located at an active fault zone which is characterised by high seismic activity. There are high deformation zone trends NE-SW. There is a high value zone located approximately at the centre of the northern portion of the study area. This high energy zone is oriented towards NE and extends to the Red Sea. The energy map shows that the energy released from the study area is considered as a part of the energy release of the Red Sea area suggesting a tectonic connection between this region and the Red Sea.
{"title":"Analysis and interpretation of geophysical data to delineate the geologic structures of Abu Dabbab area, South Eastern Desert, Egypt","authors":"Mahmoud Ahmed Ibrahim, A. Othman, Sultan Awed Sultan Araffa, Mohamed Said Mebed, M. Abu Bakr","doi":"10.1080/20909977.2021.1979890","DOIUrl":"https://doi.org/10.1080/20909977.2021.1979890","url":null,"abstract":"ABSTRACT The present study aims to identify the geologic structure of the Abu Dabbab area. The previous work state that the study area contains different ore minerals such as Tantalum, Niobium, Cassiterite, Gold, and sulphides. Processing, analysis, and interpretation of aeromagnetic and recorded seismic events data of the study area were to define the seismic activity zones and the main trend in the study area and its relation with ore deposits distribution. The area is controlled by different structural elements of trends NE-SW, NNW-SSE, and E-W. The results indicated that most of ore deposits are located at an active fault zone which is characterised by high seismic activity. There are high deformation zone trends NE-SW. There is a high value zone located approximately at the centre of the northern portion of the study area. This high energy zone is oriented towards NE and extends to the Red Sea. The energy map shows that the energy released from the study area is considered as a part of the energy release of the Red Sea area suggesting a tectonic connection between this region and the Red Sea.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"23 1","pages":"397 - 406"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86640710","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 : 2021-01-01DOI: 10.1080/20909977.2020.1859668
M. Oladunjoye, A. Adefehinti, O. Akinrinola
ABSTRACT Hydromorphic soils have potential for sustainable agricultural production due to shallow water deposition, accumulation of organic matter and residual available moisture for farming during dry season. Integrated geophysical investigations comprising Ground Penetrating Radar (GPR) and Vertical Electrical Sounding (VES) were conducted on a valley bottom soil at Ilora, Southwestern Nigeria to determine subsurface geometry, lithology and water table in relation to its agricultural significance. Seventeen GPR profiles were established while twenty eight VES were conducted using Schlumberger array. Three test pits were excavated to a depth of 1 m for ground truth. Horizons revealed on the GPR are; sub-parallel reflections assumed to be fine muddy sand rich in organic matter, low amplitude and weak reflections indicating attenuated signal because of high moisture content and mutiple chaotic, non-parallel reflectors. The VES results show system of two to four geo-electric layers with average overburden thickness of about 7 m. The excavated pits show intercalation of clayey and loamy soil and revealed water level to be 0.8 m. The integrated geophysical approach applied has successfully identified the spatial pattern of clayey soil, overburden thickness and water level of the valley bottom soil which help retention of water during dry season.
{"title":"Integrated geophysical investigation for the characterisation of valley bottom soil at Ilora, Southwestern Nigeria","authors":"M. Oladunjoye, A. Adefehinti, O. Akinrinola","doi":"10.1080/20909977.2020.1859668","DOIUrl":"https://doi.org/10.1080/20909977.2020.1859668","url":null,"abstract":"ABSTRACT Hydromorphic soils have potential for sustainable agricultural production due to shallow water deposition, accumulation of organic matter and residual available moisture for farming during dry season. Integrated geophysical investigations comprising Ground Penetrating Radar (GPR) and Vertical Electrical Sounding (VES) were conducted on a valley bottom soil at Ilora, Southwestern Nigeria to determine subsurface geometry, lithology and water table in relation to its agricultural significance. Seventeen GPR profiles were established while twenty eight VES were conducted using Schlumberger array. Three test pits were excavated to a depth of 1 m for ground truth. Horizons revealed on the GPR are; sub-parallel reflections assumed to be fine muddy sand rich in organic matter, low amplitude and weak reflections indicating attenuated signal because of high moisture content and mutiple chaotic, non-parallel reflectors. The VES results show system of two to four geo-electric layers with average overburden thickness of about 7 m. The excavated pits show intercalation of clayey and loamy soil and revealed water level to be 0.8 m. The integrated geophysical approach applied has successfully identified the spatial pattern of clayey soil, overburden thickness and water level of the valley bottom soil which help retention of water during dry season.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"68 1","pages":"110 - 124"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84162724","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 : 2020-12-23DOI: 10.1080/20909977.2020.1860610
E. Elhosseiny, M. N. Ismail, A. Tadross, R. El-Bendary, H. Selim, A. H. Ibrahim
ABSTRACT In this work, the astrophysical parameters of the open cluster Gulliver 1 are calculated using Gaia DR2 catalogue. The parameters that covered under this study are the radius, distance, colour excess, age, total mass and relaxation time also the parallax and proper motion values in both coordinates Ra and Dec beside studying the luminosity and mass functions of the cluster. Using the radial density profile, radius is found to be 6.8 ± 0.2 arcmin. We get the distance and age from the colour magnitude diagram to be 2818.38 ± 11 pc and 1.78 Gyr ±20 Myr, respectively. the horizontal-projected distances from the sun on the galactic plane X⊙ & Y⊙, the distance from the galactic plane Z⊙ and the distance from the galactic centre Rgc are obtained as 507.5 ± 2 pc, −2222 ± 8.7 pc, −1657.4 ± 6.5 pc and 3609 ± 14 pc respectively. Also, astrometric parameters are obtained such as parallax and proper motions in both coordinates Ra and Dec as 0.31 ± 0.08 mas, −7.9 ± 0.14 mas/yr and 3.6 ± 0.08 mas/yr, respectively. From the estimated relaxation time we inferred that the cluster is relaxed and has a mass of 146.2 Mʘ. Some parameters are presented for the first time.
{"title":"Analytical study of the newly discovered open cluster Gulliver 1","authors":"E. Elhosseiny, M. N. Ismail, A. Tadross, R. El-Bendary, H. Selim, A. H. Ibrahim","doi":"10.1080/20909977.2020.1860610","DOIUrl":"https://doi.org/10.1080/20909977.2020.1860610","url":null,"abstract":"ABSTRACT In this work, the astrophysical parameters of the open cluster Gulliver 1 are calculated using Gaia DR2 catalogue. The parameters that covered under this study are the radius, distance, colour excess, age, total mass and relaxation time also the parallax and proper motion values in both coordinates Ra and Dec beside studying the luminosity and mass functions of the cluster. Using the radial density profile, radius is found to be 6.8 ± 0.2 arcmin. We get the distance and age from the colour magnitude diagram to be 2818.38 ± 11 pc and 1.78 Gyr ±20 Myr, respectively. the horizontal-projected distances from the sun on the galactic plane X⊙ & Y⊙, the distance from the galactic plane Z⊙ and the distance from the galactic centre Rgc are obtained as 507.5 ± 2 pc, −2222 ± 8.7 pc, −1657.4 ± 6.5 pc and 3609 ± 14 pc respectively. Also, astrometric parameters are obtained such as parallax and proper motions in both coordinates Ra and Dec as 0.31 ± 0.08 mas, −7.9 ± 0.14 mas/yr and 3.6 ± 0.08 mas/yr, respectively. From the estimated relaxation time we inferred that the cluster is relaxed and has a mass of 146.2 Mʘ. Some parameters are presented for the first time.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"66 1","pages":"35 - 42"},"PeriodicalIF":0.0,"publicationDate":"2020-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85075709","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 : 2020-12-21DOI: 10.1080/20909977.2020.1846246
H. Ezzat, M. Hegazy, N. Nada, Osama Osman, M. Ibrahim
ABSTRACT Nanocomposite natural polymer/metal oxide (NP/MO) is an attractive new technology for numerous applications as sensors, coatings, electronic devices, adhesives and optical circuits. NP includes cellulose Cel, chitosan Cs and sodium alginate NaAlg while MO are ZnO and CuO. Furthermore, modification of NP/MO with graphene oxide (GO) increases efficiency and stability of NP/MO in all its applications and fields. Theoretical calculations using density functional theory (DFT) were conducted to study the effect of using GO on electronic properties and thermal stability of NP/MO. Total dipole moment (TDM), HOMO/LUMO band gap energy (∆E) and molecular electrostatic potential (MESP) were computed for the interaction of GO with NP/MO at B3LYP/LANL2DZ. Moreover, QSAR descriptors were also calculated for the same interactions. It was found that GO/NP/MO structure is auspicious for new materials with the efficient expense, more stable (physically and chemically), thermally stability and more sensitive, particularly GO/Cel/MO and GO/Cs/MO, while GO/Nav Alg/MO did not make significant changes.
{"title":"Development of natural polymer/metal oxide nanocomposite reinforced with graphene oxide for optoelectronic applications","authors":"H. Ezzat, M. Hegazy, N. Nada, Osama Osman, M. Ibrahim","doi":"10.1080/20909977.2020.1846246","DOIUrl":"https://doi.org/10.1080/20909977.2020.1846246","url":null,"abstract":"ABSTRACT Nanocomposite natural polymer/metal oxide (NP/MO) is an attractive new technology for numerous applications as sensors, coatings, electronic devices, adhesives and optical circuits. NP includes cellulose Cel, chitosan Cs and sodium alginate NaAlg while MO are ZnO and CuO. Furthermore, modification of NP/MO with graphene oxide (GO) increases efficiency and stability of NP/MO in all its applications and fields. Theoretical calculations using density functional theory (DFT) were conducted to study the effect of using GO on electronic properties and thermal stability of NP/MO. Total dipole moment (TDM), HOMO/LUMO band gap energy (∆E) and molecular electrostatic potential (MESP) were computed for the interaction of GO with NP/MO at B3LYP/LANL2DZ. Moreover, QSAR descriptors were also calculated for the same interactions. It was found that GO/NP/MO structure is auspicious for new materials with the efficient expense, more stable (physically and chemically), thermally stability and more sensitive, particularly GO/Cel/MO and GO/Cs/MO, while GO/Nav Alg/MO did not make significant changes.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"90 1","pages":"10 - 22"},"PeriodicalIF":0.0,"publicationDate":"2020-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85465658","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 : 2020-12-21DOI: 10.1080/20909977.2020.1838698
A. Mohamed, M. AbuBakr, M. Awad, K. Sakr, M. Etman
ABSTRACT Nile Delta is one of the most significant regions in Egypt. The offshore Nile Delta is located in a complex structural area of Mediterranean Ridge, which is an important wrench fault separating the Arabian plate to the African Plate. This study aims at monitoring the recent crustal deformation and velocity of the Northern delta beside its connection to the seismicity and tectonic activities of the African plate using the permanent GNNS stations distributed at the Egyptian Delta and Europe. The available GNNS data (2009-2019) were analysed utilising the Bernese 5.2 software, to identify the velocity vectors, and the principal segments of crustal strains along the investigated region. The results show that the average absolute velocity ranges between 14 and 22 mm/yr with an accuracy of 3 mm/yr, and the residual velocity is estimated at 0.51 to 4.98 mm/yr with an accuracy of 2.5 mm/yr. Furthermore, the rate of the gathered strains in the northern Nile Delta was recently changed from low to moderate. The outcomes show that the area under investigation suffers from irregular seismic activity related to the crustal movements, which occurred along with the major fault trends in the region.
{"title":"Utilisation of GNSS and seismicity for monitoring crustal deformation of the Northern part of the Nile Delta, Egypt","authors":"A. Mohamed, M. AbuBakr, M. Awad, K. Sakr, M. Etman","doi":"10.1080/20909977.2020.1838698","DOIUrl":"https://doi.org/10.1080/20909977.2020.1838698","url":null,"abstract":"ABSTRACT Nile Delta is one of the most significant regions in Egypt. The offshore Nile Delta is located in a complex structural area of Mediterranean Ridge, which is an important wrench fault separating the Arabian plate to the African Plate. This study aims at monitoring the recent crustal deformation and velocity of the Northern delta beside its connection to the seismicity and tectonic activities of the African plate using the permanent GNNS stations distributed at the Egyptian Delta and Europe. The available GNNS data (2009-2019) were analysed utilising the Bernese 5.2 software, to identify the velocity vectors, and the principal segments of crustal strains along the investigated region. The results show that the average absolute velocity ranges between 14 and 22 mm/yr with an accuracy of 3 mm/yr, and the residual velocity is estimated at 0.51 to 4.98 mm/yr with an accuracy of 2.5 mm/yr. Furthermore, the rate of the gathered strains in the northern Nile Delta was recently changed from low to moderate. The outcomes show that the area under investigation suffers from irregular seismic activity related to the crustal movements, which occurred along with the major fault trends in the region.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"75 1","pages":"1 - 9"},"PeriodicalIF":0.0,"publicationDate":"2020-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83367232","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：