NRIAG Journal of Astronomy and Geophysics最新文献_第10页

Kaolinite under pressure at audio frequency range and its electrical features 高压下高岭石在音频范围内的电气特性

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1719341

M. Gomaa

{"title":"Kaolinite under pressure at audio frequency range and its electrical features","authors":"M. Gomaa","doi":"10.1080/20909977.2020.1719341","DOIUrl":"https://doi.org/10.1080/20909977.2020.1719341","url":null,"abstract":"ABSTRACT Electrical features of a humid kaolinite specimens was measured at various pressures and at various frequencies . Surface impedance is supposed on kaolinite particle surfaces (from humidity), chemical reaction and charge transport along surface hydroxyls of kaolinite edges besides the permanent negative charges. Classic mixture laws do not support the interpretation of electrical properties, especially, at high pressures. Accordingly, interpretation was made with percolation threshold theories. Pressure increase causes decrease in pore spaces and accordingly increases possible connections of pore distances filled with humidity to total pore spaces after applying pressure. With pressure increase, the pore voids between particles decrease and water conducting paths increase. Also, dielectric constant and conductance increase with increase of pressure. On the other hand, at a certain pressure, at low frequencies, a noticeable increase of capacitance with pressure increase, that tends to reach constant value, for relatively high pressures. The diffusion and interfacial mechanisms was suggested to interpret samples with increase of pressure and frequency. The latter mechanism acts simultaneously with surface chemical reaction mechanism (Debye behavior) to give a depressed arc (relaxation time distribution). Finally, the pressure and frequency are effective factors on electrical properties.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"42 1","pages":"176 - 189"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83111384","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}

引用次数: 5

Evolution in seismic monitoring system and updating seismic zones of Egypt 埃及地震监测系统的演变与地震带的更新

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1803661

E. Fergany, K. Omar, Gad-El-Kareem A. Mohammed

{"title":"Evolution in seismic monitoring system and updating seismic zones of Egypt","authors":"E. Fergany, K. Omar, Gad-El-Kareem A. Mohammed","doi":"10.1080/20909977.2020.1803661","DOIUrl":"https://doi.org/10.1080/20909977.2020.1803661","url":null,"abstract":"ABSTRACT On 3 September 2015, an unexpected earthquake with magnitude MB = 4.5 occurred in a completely silent area, located at 40 km south El Alamein city north western desert, where there are ~ 20 million pieces of unexploded ordnance. This study aims to: i) review and interpret the widespread seismic activity in Egypt during the last three decades, and ii) delineate the active seismic source zones map of Egypt based on realistic assumptions. These assumptions include only the real and accurate seismic events from the whole earthquake catalogue of Egypt. The idea based on the accuracy of the monitoring system, magnitude size of earthquakes, and detailed structure elements map of Egypt. The seismic catalogue of Egypt was updating to the end of 2019 including the historical and instrumental earthquakes since −2200 BC. The seismicity map of Egypt was outlined along five interval periods based on the significant evolution in the seismic monitoring system. The advanced monitoring period in the detection and location of seismic events in entire Egypt was supposed to begin in 2003 where the ENSN almost accomplished. Seismicity of advanced monitoring period 2003–2019 can be used as a tracer of real seismicity boundaries entire Egypt. Active seismic source zones map was delineated based on the advanced monitoring period and the unified Mw ≥ 4.5 instrumental catalogue from 1900 to 2019. To validate the seismic zones model, it compared with the structural elements map and given a rational matching. The new local seismic spots entire Egypt was discussed because of the invention in the seismic monitoring system entire Egypt and attributed to the misdetection and/or dislocation events due to the lack of monitoring system before the accomplished of ENSN. In conclusion, a validated active seismic zones map of Egypt was delineated using real and accurate seismic and geologic data based on powerful assumptions.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"29 1","pages":"548 - 557"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79834560","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}

引用次数: 1

Geoelectrical analysis for evaluating the aquifer hydraulic characteristics in Ain El-Soukhna area, West Gulf of Suez, Egypt 埃及西苏伊士湾Ain El-Soukhna地区含水层水力特征地电分析

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1713583

M. Youssef

引用次数: 14

Airborne gamma-ray spectrometric data interpretation on Wadi Queih and Wadi Safaga area, Central Eastern Desert, Egypt 埃及中东部沙漠Wadi Queih和Wadi Safaga地区机载伽玛射线光谱数据解释

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1728893

R. E. El Qassas, M. Salaheldin, S. M. Assran, Th. Abdel Fattah, M. Rashed

{"title":"Airborne gamma-ray spectrometric data interpretation on Wadi Queih and Wadi Safaga area, Central Eastern Desert, Egypt","authors":"R. E. El Qassas, M. Salaheldin, S. M. Assran, Th. Abdel Fattah, M. Rashed","doi":"10.1080/20909977.2020.1728893","DOIUrl":"https://doi.org/10.1080/20909977.2020.1728893","url":null,"abstract":"ABSTRACT Wadi Queih and Wadi Safaga lie in the central part of the Eastern Desert of Egypt. The airborne gamma-ray spectrometric data of the study area have been interpreted qualitatively and quantitatively and correlated with the surface lithologic units to define the anomalous uranium zones and to reveal if any association is present between the radiometric anomalies and the structural trends.The radiometric data have been treated statistically. The results revealed that the area has a wide range of radioactivity ranging from 0.1 to 23.6 Ur for the total-count (TC), 0.1 to 3.3 % for potassium (K), 0.01 to 19.1 ppm for equivalent uranium (eU), and 0.29 to 18.9 ppm for equivalent thorium (eTh). The calculated CV values for all the rock units in the study area are less than 100% for three radio-elements (K, eU, eTh), except for potassium in Thebes Formation. The younger granites and Duwi Formation have the highest radiometric values. The lowest values exist over ophiolitic metagabbro, basic metavolcanics, metasediments, serpentinites, and Umm Gheig Formation. The generated composite radio-elements and composite image maps define the locations of the high anomalous radiometric and eU zones as bright white areas. The most radioactive anomalies have NW-SE and NE-SW trends.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"25 1","pages":"155 - 167"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84708700","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}

引用次数: 4

Investigation of groundwater occurrences in structurally controlled terrain, based on geological studies and remote sensing data: Wadi El Morra, South Sinai, Egypt 基于地质研究和遥感数据的构造控制地形地下水赋存情况调查:埃及南西奈的Wadi El Morra

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1788270

Hussien M. Hussien, M. Yousif, Abdelfatah El Sheikh

{"title":"Investigation of groundwater occurrences in structurally controlled terrain, based on geological studies and remote sensing data: Wadi El Morra, South Sinai, Egypt","authors":"Hussien M. Hussien, M. Yousif, Abdelfatah El Sheikh","doi":"10.1080/20909977.2020.1788270","DOIUrl":"https://doi.org/10.1080/20909977.2020.1788270","url":null,"abstract":"ABSTRACT The investigations of groundwater occurrences and its recharge mechanisms in structurally controlled terrain under arid environments are necessary for developing sustainable management strategies. In current study, an interdisciplinary approach includes readily accessible climatic, geological, topographic, and hydrological datasets together with satellite imagery and field data, were employed for better understand of the groundwater regime existing under special geological setting. Our findings indicate that: 1) the Araba sandstone aquifer has maximum thickness of about 220 m in some area controlled by structural setting, particularly the basement uplift, 2) the hydrologic analyses of this basin revealed that it received a total 52.66 × 106 m3 of rainfall between July 2018 to June 2019 that led to runoff volume about 29.47 × 106 m3 with total losses amounts about 23.2 × 106 m3, 3) topographically-driven modern recharge to the structural controlled terrain (Wadi El Morra) can be occurred, and therefore further investigation related to the aquifer response to climate variability, are required. The study suggested a management plan to capitalize the available surface water potentialities of El Morra basin through establishing three lakes that store water and enhance the groundwater recharge opportunities. In addition, three regions are selected for future groundwater exploration based on geological and subsurface data.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"55 1","pages":"512 - 531"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85070933","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}

引用次数: 3

Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt 埃及卢克索新提巴市拟议扩建的地震场地效应估计

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1784697

Abdelnasser Mohamed, Sayed Mohamed Ali, A. Mostafa

{"title":"Estimation of seismic site effect at the new Tiba City proposed extension, Luxor, Egypt","authors":"Abdelnasser Mohamed, Sayed Mohamed Ali, A. Mostafa","doi":"10.1080/20909977.2020.1784697","DOIUrl":"https://doi.org/10.1080/20909977.2020.1784697","url":null,"abstract":"ABSTRACT The Horizontal-to-Vertical Spectral Ratio (HVSR) technique is one of the most suitable tools for estimating the geological effect on ground motion. The main target of this study is to estimate the site effect and the fragility index value at the new Tiba City proposed extension. To achieve these targets, 21 ambient vibration recordings were conducted with 1 km grid to cover the investigated area. The estimated predominant frequency (f0) distribution is a relative uniform and occurs at low frequency, ranging from 0.35 to 0.75 Hz and its maximum corresponding amplitude of seismic wave (A0) starts from 3.1 up to 6.5. The qualitative interpretation of loose sedimentary cover thickness is large (136 to 410 m with average ~270 m) that coincided with occurrence of (f0) at low level. The fragility index for the ground (Kg) at each measured site was computed depending on the estimated H/V amplitude and corresponding (f0), and found to range from 17 to 118 across the investigated area. The highest values of Kg were obviously found in the northeastern part of the proposed site, where the highest amplification factor and the lowest fundamental frequency are found.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"4 1","pages":"499 - 511"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90995101","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}

引用次数: 2

Characteristics of the simulated pollutants and atmospheric conditions over Egypt 埃及上空模拟污染物和大气条件的特征

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1755479

A. Saber, H. Abdel Basset, M. Morsy, F. El-Hussainy, M. Eid

{"title":"Characteristics of the simulated pollutants and atmospheric conditions over Egypt","authors":"A. Saber, H. Abdel Basset, M. Morsy, F. El-Hussainy, M. Eid","doi":"10.1080/20909977.2020.1755479","DOIUrl":"https://doi.org/10.1080/20909977.2020.1755479","url":null,"abstract":"ABSTRACT In this paper the integrated chemistry-climate model (RegCM4-CHEM) was used to study the characteristics of the simulated pollutants and atmospheric conditions over Egypt with a focus on the Nile Delta (ND) region. The densely populated ND region is known for its severe air quality issues driven by high levels of anthropogenic pollution in conjunction with natural sources such as dust, and agricultural burning events. The data used in our study is from Monitoring Atmospheric Composition and Climate reanalysis data (2003–2010) and from the RegCM4-CHEM model simulation (2001–2010) over Egypt. It is found that surface ozone (O3) has higher values during the period from May to September that indicates their sensitivity to temperature and sinking air above the subtropical high pressure during these hot months. Higher values of carbon monoxide (CO) occur in winter associated with the largest amounts of fuel burning in winter. The higher values of formaldehyde (HCHO) occur in summer associated with high temperatures and an abundance of OH (hydroxyl radical). The higher values of NOy appear in summer months, September and October in the layer between 1000 and 300 hPa, it is in the upper layer is generally greater than in the middle because it contains nitrogen oxide (NOx), which regarded as a catalyst in O3 loss and production.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"142 4 1","pages":"402 - 419"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83862833","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}

引用次数: 7

Evaluation of Abu Madi Formation in Baltim North & East gas fields, Egypt, using seismic interpretation and well log analysis 利用地震解释和测井分析评价埃及Baltim东北气田Abu Madi组

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1765275

H. H. E. Kadi, S. Shebl, M. Ghorab, A. Azab, M. Salama

{"title":"Evaluation of Abu Madi Formation in Baltim North & East gas fields, Egypt, using seismic interpretation and well log analysis","authors":"H. H. E. Kadi, S. Shebl, M. Ghorab, A. Azab, M. Salama","doi":"10.1080/20909977.2020.1765275","DOIUrl":"https://doi.org/10.1080/20909977.2020.1765275","url":null,"abstract":"ABSTRACT Abu Madi Formation is a gas fertile rock unit in Nile Delta basin and the main gas production rocks in Baltim fields which located in the Mediterranean sea, north of Baltim city, Egypt. This rock unit in the study area contains two gas productive sand zones; these are zone III main and zone III lower. The lithologic components of Abu Madi Formation that defined from the dia-porosity (density–neutron) cross-plot and the tri-porosity (RHOMAA–DTMAA) cross-plot, showing that, Abu Madi Formation consists mainly of sandstone, shale, shaly sandstone in some parts and calcareous material. The resultant petrophysical parameter values, revealed that, both zone III main and zone III lower in the area under investigation show potential in their petrophysical characteristics, as a fertile gas reservoir. Zone III lower shows the most advanced petrophysical characterisation as a desired reservoir, with lower value of shale volume of 4%, good effective porosity of 17% and higher value of hydrocarbon saturation of 70%. Finally, these reservoirs are bounded by two normal faults with remarkable displacement. The first fault located at south, strike E - W and dips toward the North, the other fault located north, trending NE- SW and dips to the north.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"26 1","pages":"449 - 458"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80575370","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}

引用次数: 6

Sky twilight brightness at zenith expressed in magnitudes 以星等表示的天顶的暮色亮度

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1714176

S. Nawar, A. Morcos, R.M. El Agmy, G. Gad, Samar Elgohary

引用次数: 1

Sequoia reservoir evaluation through conventional petrophysical analysis in Eastern Mediterranean, Nile Delta, Egypt 利用常规岩石物理分析评价埃及尼罗河三角洲东地中海地区红杉储层

NRIAG Journal of Astronomy and Geophysics Pub Date : 2020-01-01 DOI: 10.1080/20909977.2020.1711696

H. M. El Shayeb, G. Abdel-Gawad, A. Noah, M. M. Abuelhasan, M. A. Ataallah

{"title":"Sequoia reservoir evaluation through conventional petrophysical analysis in Eastern Mediterranean, Nile Delta, Egypt","authors":"H. M. El Shayeb, G. Abdel-Gawad, A. Noah, M. M. Abuelhasan, M. A. Ataallah","doi":"10.1080/20909977.2020.1711696","DOIUrl":"https://doi.org/10.1080/20909977.2020.1711696","url":null,"abstract":"ABSTRACT The Sequoia Field, in West Delta Deep Marine concession, represents deep marine slope channels in Nile Delta of Egypt. The main hydrocarbon bearing formation is the Late Pliocene El Wastani Formation. Sequoia Channel of the El Wastani Formation are considered as the main reservoirs of Sequoia Field. Well log data analysis, of five wells were accomplished using computer software programs (e.g. Interactive petrophysics (I.P.) Software was used in petrophysical evaluation for Petrophysical analysis, in terms of determining the effective porosity, shale volume, and reservoir fluid saturation of Sequoia Channel of El Wastani Formation, is the primary aim of this study in order to achieve better determination of the reservoir quality in Sequoia Field. We found that Sequoia Channel of El Wastani Formation is having high storage capacity properties permit them of bearing a good amount of hydrocarbon fluids in the Sequoia Field. It was found that effective porosity ranges between 19% and 29%, shale content ranges between 10% and 28%, the water saturation ranges between 15% and 40%. It is clear that the facies effect is the main factor that is controlling the distribution of the petrophysical properties.","PeriodicalId":100964,"journal":{"name":"NRIAG Journal of Astronomy and Geophysics","volume":"24 1","pages":"52 - 62"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72705470","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}

引用次数: 3