Journal articles: 'Geo-electric'

1

Tang, Bo, Fei Qiao, Guang Zu Ge, Zi Hang Qu, Ying Huang, and Jian Xiong Zhu. "Research of Geoelectric Field Observation Interference with Different Electrode Arrangements from UHVDC Power Lines." Applied Mechanics and Materials 380-384 (August 2013): 3262–65. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3262.

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The interference from UHVDC power lines is a key issue puzzling the geo-electric field observation in seismic station. According to the working principle of geo-electric field observation instrument, the interference reason on geo-electric field observation is analyzed, which potential distribution of the electrodes in soil of geo-electric field observation instrument is changed by the ground current from ground electrode of power line. Based on the different electrode arrangements, the electric field calculation model at different positions away from ground electrode is established, and thus the variation could be acquired. The results show that interference values are affected due to the electrode spans and the electrode arrangement directions, and there has the minimum interference when the electrode span is 100 m or the angle between line of two electrodes and radial line of ground electrode is 45°.

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Prevot, D., Y. Borthomieu, F. Malet, C. Rebuffel, A. Carre, and C. Cenac-Morthe. "Saft Solutions For Full Geo Electric Propulsion." E3S Web of Conferences 16 (2017): 17005. http://dx.doi.org/10.1051/e3sconf/20171617005.

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A Allen, Dr David. "Water seepage investigation using geo-electric streamers." ASEG Extended Abstracts 2012, no. 1 (December 2012): 1–4. http://dx.doi.org/10.1071/aseg2012ab046.

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Ye, Lijun, Chunyang Liu, Wenshan Zhu, Haining Yin, Fucheng Liu, and Hexi Baoyin. "North/South Station Keeping of the GEO Satellites in Asymmetric Configuration by Electric Propulsion with Manipulator." Mathematics 10, no. 13 (July 4, 2022): 2340. http://dx.doi.org/10.3390/math10132340.

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Geosynchronous orbit (GEO) is a very important strategic resource. In order to maximize the utilization of the GEO resources, the use of all-electric propulsion GEO platforms can greatly extend the service life of satellites. Therefore, this paper proposes a control scheme of the north/south station keeping (NSSK) by using electric propulsion with a manipulator. First, on the basis of the traditional calculation method of the semi-diurnal period of the orbital inclination, the calculation method of the semi-monthly period and the semi-annual period of the orbital inclination are proposed. The new method can reduce the fuel consumption and reduce the control amount and control frequency of the station keeping (SK). Secondly, a fuel-optimized NSSK algorithm by using electric propulsion with a manipulator is proposed. The algorithm can not only be applied to a large initial orbital inclination but also can unload the large angular momentum of the asymmetric satellites while keeping the north/south station, thereby avoiding the loss of control of the satellite’s attitude. The research results of this paper provide a new idea for the SK control of the GEO satellites and have great engineering application value.

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Reza, AHM Selim, Quamrul Hasan Mazumder, and Mushfique Ahmed. "Geo-electrical Resistivity Survey in the High Barind for the Delineation of Aquifer Geometry." Rajshahi University Journal of Science 39 (October 9, 2013): 27–37. http://dx.doi.org/10.3329/rujs.v39i0.16540.

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Geo-electrical resistivity techniques have been employed in the High Barind as a reconnaissance investigation for the subsurface lithology. Out of 13 upazillas, comprising the Barind tract, Sapahar and Porsha Upazillas, situated in the High Barind are badly affected by water shortage. Vertical electrical soundings (VES) were executed using Schlumberger configuration in different areas taking the current electrode separation up to 170 meters. Direct method technique was employed to evaluate the geo-electric layer such as resistivity and thickness of the discrete layers. The results of the resistivity survey give the subsurface information consisting of three to four layers. The results of geo-electric sounding have been compared with the geological section wherever available. DOI: http://dx.doi.org/10.3329/rujs.v39i0.16540 Rajshahi University J. of Sci. 39, 27-37 (2011)

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Doumbia, Vafi, Kouadio Boka, Nguessan Kouassi, Oswald Didier Franck Grodji, Christine Amory-Mazaudier, and Michel Menvielle. "Induction effects of geomagnetic disturbances in the geo-electric field variations at low latitudes." Annales Geophysicae 35, no. 1 (January 4, 2017): 39–51. http://dx.doi.org/10.5194/angeo-35-39-2017.

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Abstract. In this study we examined the influences of geomagnetic activity on the Earth surface electric field variations at low latitudes. During the International Equatorial Electrojet Year (IEEY) various experiments were performed along 5° W in West Africa from 1992 to 1995. Among other instruments, 10 stations equipped with magnetometers and telluric electric field lines operated along a meridian chain across the geomagnetic dip equator from November 1992 to December 1994. In the present work, the induced effects of space-weather-related geomagnetic disturbances in the equatorial electrojet (EEJ) influence area in West Africa were examined. For that purpose, variations in the north–south (Ex) and east–west (Ey) components of telluric electric field were analyzed, along with that of the three components (H, D and Z) of the geomagnetic field during the geomagnetic storm of 17 February 1993 and the solar flare observed on 4 April 1993. The most important induction effects during these events are associated with brisk impulses like storm sudden commencement (ssc) and solar flare effect (sfe) in the geomagnetic field variations. For the moderate geomagnetic storm that occurred on 17 February 1993, with a minimum Dst index of −110 nT, the geo-electric field responses to the impulse around 11:00 LT at LAM are Ex = 520 mV km−1 and Ey = 400 mV km−1. The geo-electric field responses to the sfe that occurred around 14:30 LT on 4 April 1993 are clearly observed at different stations as well. At LAM the crest-to-crest amplitude of the geo-electric field components associated with the sfe are Ex = 550 mV km−1 and Ey = 340 mV km−1. Note that the sfe impact on the geo-electric field variations decreases with the increasing distance of the stations from the subsolar point, which is located at about 5.13° N on 4 April. This trend does not reflect the sfe increasing amplitude near the dip equator due the high Cowling conductivity in the EEJ belt.

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Omowumi, Falae Philips. "Application of Electrical Resistivity in Buildings Foundation Investigation in Ibese Southwestern Nigeria." Asia Pacific Journal of Energy and Environment 1, no. 2 (December 31, 2014): 91–102. http://dx.doi.org/10.18034/apjee.v1i2.214.

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Application of geophysical investigation has been carried out using Vertical Electrical Sounding (VES) at the proposed building site in Ibese Southwest Nigeria to determine the geophysical parameters that can be used to evaluate the structural competence of the subsurface geological characteristics of the site for construction purposes and building development. The Schlumberger configuration was used for the data acquisition. One-dimensional numerical inversion of individual DC resistivity was used to enhance the processing of the results for better achievement of the aim of the study. Models obtained from the 2D inversion of each VES were used for construction of geo-electric sections which exhibit the main geo-electric characteristics of the geological units present in the area. The interpretation results showed that the geo-electric sections consist of three-four layers namely: topsoil, pebble clay, limestone and sand/limestone. The layer resistivities and thicknesses range from 11 - 404 Ohm-m/0.4 - 1.5 m, 2-210 Ohm-m/ 0.8 - 9.2m and 33 - 160Ohm-m respectively. The investigation revealed that the sand/limestone litho unit is to be the most competent for shallow foundation for small to medium engineering structures.

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Lu, Wenqiang, Haoguang Wang, Guoqiang Wu, and Yong Huang. "Orbit Determination for All-Electric GEO Satellites Based on Space-Borne GNSS Measurements." Remote Sensing 14, no. 11 (May 31, 2022): 2627. http://dx.doi.org/10.3390/rs14112627.

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Orbit accuracy of the transfer orbit and the mission orbit is the basis for the orbit control of all-electric-propulsion Geostationary Orbit (GEO) satellites. Global Navigation Satellite System (GNSS) simulation data are used to analyze the main factors affecting GEO satellite orbit prediction accuracy under the no-thrust condition, and an electric propulsion calibration algorithm is designed to analyze the orbit determination and prediction accuracy under the thrust condition. The calculation results show that the orbit determination accuracy of mission orbit and transfer orbit without thrust is better than 10 m using onboard GNSS technology. The calibration accuracy of electric thrust is about 10−9 m/s2 and 10−7 m/s2 with 40 h and 16 h arc length, respectively, using the satellite self-positioning data of 100 m accuracy to calibrate the electric thrust. If satellite self-positioning data accuracy is at the 10 m level, the electric thrust calibration accuracy can be improved by about one order of magnitude, and the 14-day prediction accuracy of the transfer orbit with thrust is better than 1 km.

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Rabinah, A. H., Kusnadi, J. D. Anggraeni, M. Arisalwadi, and E. Agustriani. "Hydrogeology estimation using geo-electric survey in Sekotong, Lombok Barat." IOP Conference Series: Earth and Environmental Science 413 (January 2, 2020): 012005. http://dx.doi.org/10.1088/1755-1315/413/1/012005.

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10

Shen, Junfeng, Xuhui Shen, Qian Liu, and Na Ying. "The thermo-electric effect of magnetite and the mechanism of geo-electric abnormalities during earthquakes." Geoscience Frontiers 1, no. 1 (October 2010): 99–104. http://dx.doi.org/10.1016/j.gsf.2010.08.004.

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11

Konstantaras, A., G. N. Fouskitakis, J. P. Makris, and F. Vallianatos. "Stochastic analysis of geo-electric field singularities as seismically correlated candidates." Natural Hazards and Earth System Sciences 8, no. 6 (December 18, 2008): 1451–62. http://dx.doi.org/10.5194/nhess-8-1451-2008.

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Abstract. The study of the Earth's electromagnetic field prior to the occurrence of strong seismic events has repeatedly revealed cases where transient electric potential anomalies, often deemed as possible earthquake precursors, were observed on electromagnetic field recordings. In an attempt to understand the nature of such signals, several models have been proposed based upon the exhibited characteristics of the observed anomalies, often supported by different mathematical models simulating possible generation mechanisms. This paper discusses a candidate Electric Earthquake Precursor (EEP) signal, accompanying the Kythira Mw=6.9 earthquake in Greece (occurred on 8 January 2006). Neuro-Fuzzy along with stochastic models are currently incorporated for the modelling and analysis of the recorded Earth's electric field. The results of the study indicate that the Neuro-Fuzzy model treats the observed possible EEP signal as an external additive component to the recorded Earth's electric field, while the stochastic TARMA models accurately represent the recorded electric signals in both the time and the frequency domains. The complementary findings of both methodologies might potentially contribute to the future development of a more accurate and generalized framework for the efficient recognition and characterization of possible EEP's.

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Chen, Hong, Xingbing Xie, Enqin Liu, Lei Zhou, and Liangjun Yan. "Application of Infrared Remote Sensing and Magnetotelluric Technology in Geothermal Resource Exploration: A Case Study of the Wuerhe Area, Xinjiang." Remote Sensing 13, no. 24 (December 8, 2021): 4989. http://dx.doi.org/10.3390/rs13244989.

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As a new green energy source, geothermal resource’s exploration, development, and utilization are an important direction in geophysical exploration at present. In this study, the actual land surface temperature was inferred based on the thermal infrared band of Landsat8 remote-sensing images, and the information about the surface anomalies and their spatial distribution was obtained through a multifactor analysis. In addition, three magnetotelluric sounding profiles were deployed in the study area, and the geo-electric sections in the study area were obtained through inversion of the measured data. Then, based on the inverse geo-electric information and the land surface temperature anomaly information, we analyzed and verified the geothermal resource genesis of the thermal anomaly area and inferred the favorable geothermal resource area in the study area. The results show that these two methods can be used to compare and analyze the possible distribution of the geothermal resources in the study area in two dimensions: the spatial distribution on the surface and the vertical distribution in the subsurface. Moreover, the results of the geothermal anomalies inferred from the thermal infrared remote sensing and the geo-electric results inferred from the magnetotelluric data are in good agreement. This study demonstrates that the integrated application of thermal infrared remote sensing and magnetotelluric technology is a promising tool for geothermal exploration.

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Shaibu, Isah, M. O. Ovwasa, and A. Misbahu. "EVALUATION OF THE SUBSURFACE STRUCTURES IN PART OF FEDERAL UNIVERSITY OF GUSAU CAMPUS , ZAMFARA STATE, NIGERIA." FUDMA JOURNAL OF SCIENCES 6, no. 1 (April 11, 2022): 338–50. http://dx.doi.org/10.33003/fjs-2022-0601-906.

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Geo-electric evaluations of the subsurface structures of federal University Gusau Campus, Zamfara State, Nigeria were carried out using vertical electrical soundings technique (VES). The area lies within the Pre-Cambian Basement Complex of Northern Nigeria. Thirty-six (36) vertical electrical soundings (VES) along six profiles (A-F) were carried out during the survey. The surveys were carried out on grid 500m by 500m. The data obtained were interpreted using computer based program named Zohdy. The result of the interpreted curves reveals three distinct geo-electric curves types were delineated: K, H and HK-curves with H-type having the most prolific aquifer. The result also shows 3 geo-electric layers which were confirm by some borehole lithology. The aquifers in the study area are likely to be found in the fractured basement layers of western and southeastern parts of the study area. The civil engineering work can be sited mostly in the northern and southwestern parts of the study area which are the region of shallow basement within t=he study areas. Further boreholes in the area should reached an effective depth of 75m to 90m and the borehole be supervised by a certified hydrogeologist for optimum groundwater yields. Pumping test should be carried out in order to ascertain the size and type of submersible pump to install.

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Pujianiki, Ni Nyoman, and I. Nengah Simpen. "Aplikasi Geolistrik pada Pemetaan Daerah Intrusi Air Laut di Pantai Candidasa." MEDIA KOMUNIKASI TEKNIK SIPIL 24, no. 1 (August 24, 2018): 29. http://dx.doi.org/10.14710/mkts.v24i1.17574.

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To know the magnitude of sea water intrusion that occurred in Candidasa area need to be mapping by using Geo-electric Method. Geo-electric method is one Geophysical method that works by injecting an electric current into the ground and then measured the potential difference it generates. Based on the data of electric current and potential difference, resistivity will be obtained in the research area. The result of sea water intrusion mapping in Candi Dasa beach area indicates that sea water intrusion has occurred but not yet on the status of conspiracy. If groundwater extraction is not restricted, the level of intrusion will continue to increase. Contour resistivity indicates that there has been a sea water intrusion in the Candidasa Tourism Area in a mild status in the southeast area at a depth of 5-10 m. The measured rock resistivity values in the study sites ranged from 0.35 to 1800 ohm.m, the seawater intrusion criteria occurred at a resistivity of 0.5 - 30 ohm.m. The results of the study are expected to give policyholders input on sea water intrusion in Candidasa Tourism area so that appropriate policy steps can be taken.

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15

English, Robert E. "Evolving SP-100 powerplants via electric propulsion to GEO and lunarorbit." Journal of Propulsion and Power 9, no. 3 (May 1993): 449–55. http://dx.doi.org/10.2514/3.23642.

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Shi, Renhe, Li Liu, Teng Long, Jian Liu, and Bin Yuan. "Surrogate assisted multidisciplinary design optimization for an all-electric GEO satellite." Acta Astronautica 138 (September 2017): 301–17. http://dx.doi.org/10.1016/j.actaastro.2017.05.032.

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17

Sualla, S., M. Tijani, M. Oladunjoye, and O. Oki. "Geo-electric Laboratory Simulation for Characterization of Hydrocarbon Impacted Coastal Sands." Archives of Current Research International 12, no. 1 (January 24, 2018): 1–16. http://dx.doi.org/10.9734/acri/2018/37490.

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Burlov, Vyacheslav, and Maxim Polyukhovich. "System integration of processes of ensuring electric power networks safety under the conditions of impact of meteorological factors." E3S Web of Conferences 289 (2021): 01015. http://dx.doi.org/10.1051/e3sconf/202128901015.

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The problem of the influence of meteorological factors on electric power networks continues to be relevant. For the safe fulfillment of their purpose, electric power networks as an element of the electric power system must guarantee the safety, stability and efficiency of the electric power supply process. To solve the above problems, it is necessary to make decisions based on meteorological observations, since the safety of electric power networks depends on the timely forecasting of meteorological factors. The study examines the possibility of system integration of the process of ensuring the safety of electric power networks and the process of monitoring meteorological factors. In order to increase the level of safety of electric power networks, it is proposed to use a geo information system that collects, processes and transfers meteorological data.

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Magawata, U. Z., Ibrahim Mohammed, B. A. Ojulari, A. I. Augie, and Salisu Musa. "Geo-Electric Assessment of Kali Failed Dam Project Aliero, North Western Nigeria." International Journal of Geosciences 11, no. 01 (2020): 1–13. http://dx.doi.org/10.4236/ijg.2020.111001.

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Idfi, G., N. Suryoputro, Y. A. Laksono, and N. L. Khomsiati. "Ground water exploration using geo-electric method for Sumber Cemung pool development." IOP Conference Series: Materials Science and Engineering 669 (November 21, 2019): 012008. http://dx.doi.org/10.1088/1757-899x/669/1/012008.

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Rahmatsyah, Rita Juliani, and Juniar Hutahean. "Analysis of Clam Hill Site in Aceh Tamiang Using Geo-electric Method." Journal of Physics: Conference Series 1485 (March 2020): 012043. http://dx.doi.org/10.1088/1742-6596/1485/1/012043.

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ALABI, A. A., A. O. ADEWALE, O. O. ADELEKE, F. G. AKINBORO, AYODEJI AFE, and ADAM GANIYU. "GEO-ELECTRIC INVESTIGATION OF GROUNDWATER POTENTIAL IN LADERIN HOUSING ESTATE, ABEOKUTA, SOUTHWESTERN, NIGERIA." Journal of Natural Sciences Engineering and Technology 19, no. 1 (December 2, 2021): 74–91. http://dx.doi.org/10.51406/jnset.v19i1.2098.

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Vertical Electrical Sounding (VES) and 2D Electrical Resistivity Tomography (ERT), with Schlumberger and Wenner electrode array configurations respectively were employed to investigate the groundwater potential of Laderin Housing Estate located at Oke-mosan, Abeokuta, Ogun state, southwestern Nigeria. The area is underlain by the basement complex of the southwestern Nigeria. The research aimed at determining the aquifer/groundwater zone and characterizes the lithology of the study area. The geophysical survey involving nine VES and four profile of 2-D ERT lines with lengths varying from 100 m to 150 m were carried out. The field data from both the ERT and VES were processed and interpreted using RES2DINV and WINRESIST software respectively. Geometrical effects from the pseudo-section were removed and an image of true depth and true formation resistivity were produced. Three to four geo-electric layers were revealed in all, which are; topsoil, weathered layer, fractured and fresh basement rock. The result of 2 D inversion provide lithologic unit, weathering profile and geological structure favourable for groundwater potential. The results show that the basement rock was delineated with resistivity values that range between 701.3 Ωm and 9459.3 Ωm. The bedrock topography has a variable thickness of overburden between 3 m and above 16.4 m, which is fairly shallow. The geophysical survey show that VES 2, VES 3, VES 4, VES 5, and VES 6 are possible location for groundwater extraction. The difficult terrain, where thick overburden are located are also promising target for groundwater development.

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Zhang-Hui, AN, DU Xue-Bin, TAN Da-Cheng, FAN Ying-Ying, LIU Jun, and CUI Teng-Fa. "Study on the Geo-Electric Field Variation of Sichuan LushanMS7.0 and WenchuanMS8.0 Earthquake." Chinese Journal of Geophysics 56, no. 6 (November 2013): 721–30. http://dx.doi.org/10.1002/cjg2.20065.

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Papadopoulou, Konstantina, Efthimios Skordas, Jacques Zlotnicki, Toshiyasu Nagao, and Anatoly Rybin. "Study of Geo-Electric Data Collected by the Joint EMSEV-Bishkek RS-RAS Cooperation: Possible Earthquake Precursors." Entropy 20, no. 8 (August 18, 2018): 614. http://dx.doi.org/10.3390/e20080614.

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By employing the cross-correlogram method, in geo-electric data from the area of Kyrgyzstan for the period 30 June 2014–10 June 2015, we identified Anomalous Telluric Currents (ATC). From a total of 32 ATC after taking into consideration the electric current source properties, we found that three of them are possible Seismic Electric Signal (SES) activities. These three SES activities are likely to be linked with three local seismic events. Finally, by studying the corresponding recordings when a DC alternating source injects current into the Earth, we found that the subsurface resistivity seems to be reduced before one of these three earthquakes, but a similar analysis for the other two cannot be done due to their large epicentral distance and the lack of data.

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Ivchenko, N., and G. Marklund. "Observation of low frequency electromagnetic activity at 1000 km altitude." Annales Geophysicae 19, no. 6 (June 30, 2001): 643–48. http://dx.doi.org/10.5194/angeo-19-643-2001.

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Abstract. We present a statistical study of low frequency fluctuations of electric and magnetic fields, commonly interpreted as Alfvénic activity. The data base consists of six months of electric and magnetic field measurements by the Astrid-2 microsatellite. The occurrence of the events is studied with respect to the location and general activity. Large regions of broadband Alfvénic activity are persistently observed in the cusp/cleft and, during the periods of high geo-magnetic activity, also in the pre-midnight sector of the auroral oval.Key words. Ionosphere (auroral ionosphere) – Space plasma physics (waves and instabilities) – Magnetospheric physics (magnetosphere-ionosphere interactions)

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Jia, Zhuo, and Jian Min Zhang. "The Application of High-Density Resistivity Method to the Evaluation on the Stability of Gongchangling Open Pit's Slope." Applied Mechanics and Materials 686 (October 2014): 327–32. http://dx.doi.org/10.4028/www.scientific.net/amm.686.327.

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High-density resistivity method is a new, efficient electrical prospecting method, which can complete a two-dimensional (vertical and horizontal) prospecting process, possesses certain imaging functions for the geo-electric structure, and integrates electric profiling method with electric sounding method together. In this paper, the basic principle, data processing, and result explanation and inference of high-density resistivity method are introduced by taking the application of high-density resistivity method to the prospecting project in the slope of Gongchangling Open Pit, Liaoyang. The result of the prospecting result map analysis showed that the prospecting result was basically in line with the actual situation and proved the great significance of high-density resistivity method to the evaluation on the slope stability of Gongchangling open pit.

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Bezrukov, L. B., A. S. Kurlovich, B. K. Lubsandorzhiev, V. V. Sinev, V. P. Zavarzina, and V. P. Morgalyuk. "Geo-neutrino, Earth heat flux, Earth electricity." EPJ Web of Conferences 191 (2018): 03005. http://dx.doi.org/10.1051/epjconf/201819103005.

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We discussed the idea of big value of potassium abundance in the Earth. We showed that Borexino single event spectrum permit the potassium abundance up to 2% instead of the CNO neutrino flux contribution. Works [5], [6] introduce the idea that fast α particles are appeared in nuclear processes in solar core plasma. The reactions of these α particles with CNO nuclei can suppress the CNO neutrino flux. We demonstrated the connection between the existence of Earth’s electric field and the big value of 40K geo-neutrino flux because the both phenomena are the sequences from Hydride Earth model.

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Alabi, A. A., A. O. Adewale, J. O. Coker, and O. A. Ogunkoya. "Site Characterization for Construction Purposes at FUNAAB using Geophysical and Geotechnical Methods." Materials and Geoenvironment 65, no. 2 (September 1, 2018): 89–102. http://dx.doi.org/10.2478/rmzmag-2018-0007.

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AbstractGeophysical and geotechnical techniques were used to investigate the sub-surface information of a proposed site for a hostel construction at Federal University of Agriculture, Abeokuta. Ten vertical electrical sounding (VES) stations were adopted. Typical sounding curves obtained include the HA, KH, AKH and KQH types, of which the AKH-type consists of 40% of the survey points, and a maximum of five geo-electric sub-surface layers were delineated. Laboratory analyses were performed to investigate particle size distribution, Atterberg limit, compaction limit, California bearing ratio (CBR) and specific gravity. The CBR revealed that all soil samples, except L4, are mechanically stable and have high load-bearing capacity. The Atterberg limit test and the geo-electric section showed that the second layer of VES 4 is composed of sandy clay with high plastic index and low liquid limit, which may pose a threat to the foundation of any engineering structure. VES locations 5, 6 and 8 were identified as high groundwater potential zones suitable for optimum groundwater abstraction. The study area is suitable for both shallow and deep foundations, however VES 4 and VES 5 require reinforcement.

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Li, Chengzhang, Bo Xu, Wanmeng Zhou, and Qibo Peng. "Geostationary Station-Keeping of Electric-Propulsion Satellite Equipped with Robotic Arms." Aerospace 9, no. 4 (March 28, 2022): 182. http://dx.doi.org/10.3390/aerospace9040182.

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We propose two approaches based on feedforward control and model-predictive control, respectively, to solve the station-keeping problem of an electric-propulsion geostationary Earth orbit (GEO) satellite, whose thrusters are mounted on two robotic arms on its anti-nadir face. This novel configuration enables a wider range of thrust direction, making it possible to regard the thrust direction as control variables. To solve this control problem, we present the quick feedforward controller (QFFC) and the fuel-optimal model predictive controller (FOMPC). The QFFC is developed based on the analysis of GEO dynamics and the thruster configuration. The FOMPC applies an optimization algorithm to solve the nonlinear model predictive control (NLMPC) problem with the initial value given by the QFFC. Numerical simulations suggest that both controllers could achieve stable station-keeping over multiple objective elements with fewer thrusters and fewer maneuvers. The QFFC has higher control accuracy and lower computational requirements than the FOMPC, whereas the FOMPC could significantly save fuel consumption. The robustness assessment and other discussions of the controllers are also presented.

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Wulandari, Esti, Eko Rony Septoraharjo, Laksono Djoko Nugroho, Hudyantoro Hudyantoro, and Wateno Oetomo. "Analysis Of Water Balance Aspect On The Results Of Geo-electric Interpretation With Schlumberger Configuration." SPIRIT OF SOCIETY JOURNAL 4, no. 2 (March 31, 2021): 128–45. http://dx.doi.org/10.29138/scj.v4i2.1388.

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The background of the problem is that the need for water for various purposes constantly increases in line with the population growth and changes in water use patterns caused by technological advances, industrial growth, and changes in land use. Moreover, from the existing problems, several problem formulations were obtained as the basis for identifying the presumption of groundwater presence, among others, 1). what is the magnitude of the infiltration rate in the study area in relation to the influence of land use conditions, 2). how the results of geo-electric interpretation using the Schlumberger configuration in estimating aquifer layers based on geo-hydrological aspects, and 3). how the effect of time and cost efficiency. Based on the results of the analysis and calculations, several things can be concluded, including: 1). the volume of the infiltration rate using the Horton method (q) by considering the land cover / land use conditions (C), it is known that the average infiltration capacity on the land in the study location per year is more than 200 cm / year, and has an effective enough infiltration capacity so that it is average. -the annual average can store water up to> 200 cm / year, 2). In that area, an aquifer layer was found at a depth of 30-50 meters at the GL 1 point, and the GL point at a depth of 22-55 meters, with the results of the analysis showing the ability of the land to carry out the infiltration process properly and validated from the results of geo-electric investigations, and 3). the results evaluation analysis is able to streamline the amount of operational costs for groundwater source investigations and the time of implementation

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Allen, David, and Noel Merrick. "Robust 1D inversion of large towed geo-electric array datasets used for hydrogeological studies." Exploration Geophysics 38, no. 1 (March 2007): 50–59. http://dx.doi.org/10.1071/eg07003.

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Lozinski, Alexander R., Richard B. Horne, Sarah A. Glauert, Giulio Del Zanna, Daniel Heynderickx, and Hugh D. R. Evans. "Solar Cell Degradation Due to Proton Belt Enhancements During Electric Orbit Raising to GEO." Space Weather 17, no. 7 (July 2019): 1059–72. http://dx.doi.org/10.1029/2019sw002213.

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Ezzat, Mohamed, Daniel Vogler, Martin O. Saar, and Benjamin M. Adams. "Simulating Plasma Formation in Pores under Short Electric Pulses for Plasma Pulse Geo Drilling (PPGD)." Energies 14, no. 16 (August 4, 2021): 4717. http://dx.doi.org/10.3390/en14164717.

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Plasma Pulse Geo Drilling (PPGD) is a contact-less drilling technique, where an electric discharge across a rock sample causes the rock to fracture. Experimental results have shown PPGD drilling operations are successful if certain electrode spacings, pulse voltages, and pulse rise times are given. However, the underlying physics of the electric breakdown within the rock, which cause damage in the process, are still poorly understood. This study presents a novel methodology to numerically study plasma generation for electric pulses between 200 and 500 kV in rock pores with a width between 10 and 100 μm. We further investigate whether the pressure increase, induced by the plasma generation, is sufficient to cause rock fracturing, which is indicative of the onset of drilling success. We find that rock fracturing occurs in simulations with a 100 μm pore size and an imposed pulse voltage of approximately 400 kV. Furthermore, pulses with voltages lower than 400 kV induce damage near the electrodes, which expands from pulse to pulse, and eventually, rock fracturing occurs. Additionally, we find that the likelihood for fracturing increases with increasing pore voltage drop, which increases with pore size, electric pulse voltage, and rock effective relative permittivity while being inversely proportional to the rock porosity and pulse rise time.

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Ashari, Bugar, Darsono D, and Darmanto D. "Pattern Spread of Aquifer using Sounding Resistivity Method with Schlumberger Configuration in Dayu Gondangrejo Karanganyar." INDONESIAN JOURNAL OF APPLIED PHYSICS 4, no. 01 (May 11, 2016): 70. http://dx.doi.org/10.13057/ijap.v4i01.1172.

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The research on ground water survey by using geo-electric method Schlumberger was conducted at Dayu Village, Gondangrejo, Karanganyar. Geo-electric is one of the geo-physics method which learned about electrical current in or on the earth surface. The equipment used includes resistivitymeter, GPS (Global Position System), roll meter, hammer, electrodes, and cables. The purpose of this research is to determine the spread pattern of the aquifer, groundwater potential, the thickness and depth of the aquifer at Dayu Village. The thickness of the shallow aquifer in the area of Dayu is between 3 m to 12 m with a depth of less than 30 m, while the deep aquifer is having a depth of more than 30 m with thickness between 68.5 m up to more than 165.7m.There is a degradation of aquifer pattern from Jambu Village (West) to Mulyorejo Village (East).Inversely, we found an increase from Tanjung Lor Village (North) to Watudakon Village(south). Shallow aquifer that potentially contain much groundwater sources located in the village of Tanjung Kidul, Mulyorejo, Jambu, Kedung Ulo and Tanjung Lor. For deep aquiferispotentially found at Pucung village and Kedung Ulo village.

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Vial, Vanessa. "Consortium for Hall Effect Orbital Propulsion System (CHEOPS)." Project Repository Journal 12, no. 1 (January 31, 2022): 12–17. http://dx.doi.org/10.54050/prj1218318.

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Consortium for Hall Effect Orbital Propulsion System (CHEOPS) CHEOPS project proposes to develop three different Hall-effect thruster electric propulsion systems (EPS): a dual mode EPS for GEO applications, a low power for LEO applications and a less than 20 kW high thrust EPS for exploration applications. Each of these EPS are under development according to market needs and drivers applying incremental technology changes to existing EPS products.

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Oseni, A. E., and A. S. Durowoju. "Application of GIS in Electricity Distribution: A Case Study of part of Ashamu Layout Kosobo, Oyo East Local Government Area, Oyo State Nigeria." Nigerian Journal of Environmental Sciences and Technology 4, no. 2 (October 2020): 370–81. http://dx.doi.org/10.36263/nijest.2020.02.0106.

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Due to the natural limitations faced by the old system of keeping, planning and managing the distribution of electricity, a computerized system is developed for Power Holding Company of Nigeria (PHCN), on Ashamu Layout of Kosobo Area, Oyo State, Nigeria. Data was acquired using south total station (NTS) and the data was downloaded using NTS.comp and project boundary was plotted with AutoCAD civil 3D, 1m Ikonos resolution satellite imagery was downloaded and geo-referenced with Arcgis10.1. Spatial features such as roads and buildings were vectorized. Electricity distribution and management was designed and created using relational database management system (rdbms) approach. The raster image was added as layer to ArcGIS 10.1 environments for geo-referencing and vectorization. The roads, buildings, electric poles were vectorized and a south total station was used to acquire co-ordinates of the electric poles and transformers to their position on the imagery, creating spatial database for the study area. The developed system was tested by carrying out spatial analysis and spatial search using ArcGIS 10.1. The results obtained were displayed in graphics and tables. It was established from the result that Geographic Information System (GIS) has the capacity as an effective tool for management of electricity distribution system.

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Zhao, Lu, Hongxia Liu, Xing Wang, Yongte Wang, and Shulong Wang. "Improvements on the Interfacial Properties of High-k/Ge MIS Structures by Inserting a La2O3 Passivation Layer." Materials 11, no. 11 (November 20, 2018): 2333. http://dx.doi.org/10.3390/ma11112333.

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In this paper, the impact of La2O3 passivation layers on the interfacial properties of Ge-based metal-insulator-semiconductor (MIS) structures was investigated. It was proven that the formation of a thermodynamically stable LaGeOx component by incorporating a La2O3 interlayer could effectively suppress desorption of the interfacial layer from GeO2 to volatile GeO. The suppression of GeO desorption contributed to the decrease in oxide trapped charges and interfacial traps in the bulk of the gate insulator, or the nearby interfacial regions in the Al2O3/La2O3/Ge structure. Consequently, the hysteretic behavior of the dual-swept capacitance-voltage (C-V) curves and the frequency dispersion of multi-frequency C-V curves were remarkably weakened. Besides, more than one order of magnitude decrease in the gate leakage current density, and higher insulator breakdown electric field were obtained after inserting a La2O3 passivation layer.

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Sulu, Sweetny Steria, As’ari As’ari, and Seni Herlina Juwita Tongkukut. "PEMETAAN AKUIFER AIRTANAH DI WILAYAH KAMPUS UNSRAT MANADO DENGAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENIS." JURNAL ILMIAH SAINS 15, no. 1 (February 10, 2015): 20. http://dx.doi.org/10.35799/jis.15.1.2015.6771.

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PEMETAAN AKUIFER AIRTANAH DI WILAYAH KAMPUS UNSRAT MANADO DENGAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENISABSTRAK Penelitian ini bertujuan untuk memetakan keberadaan akuifer air tanah di Jl. Kampus Selatan Kecamatan Sario Kota Manado berdasarkan resistivitas batuan bawah permukaan hasil eksplorasi geofisika dengan metode geolistrik tahanan jenis. Penelitian ini terdiri dari 18 titik sounding yang terbagi dalam 4 lintasan dimana setiap lintasan dibuat model struktur lapisan tanah dibawah permukaan. Kondisi lapisan akuifer airtanah ini dapat dieksplorasi dengan metode geofisika yang dapat digunakan untuk menyelidiki struktur bawah permukaan berdasarkan perbedaan resistivitas batuan. Hasil eksplorasi ini kemudian diolah dengan menggunakan software IP2WIN untuk melihat data lapisan tanah berdasarkan nilai resistivitasnya (2D) dan pesebaran titik – titik terdapatnya akuifer airtanah. Berdasarkan model struktur lapisan tanah di bawah permukaan ini diperoleh lapisan akuifer airtanah yang berupa akuifer airtanah dangkal dengan nilai resistivitas ρ 14,5 Ωm. Lapisan akuifer airtanah yang berupa akuifer airtanah dangkal permukaan dengan kedalaman 2 meter pada titik sounding 3. Kedalaman 3 meter pada setiap titik sounding. Terdapat akuifer airtanah dangkal dalam pada kedalaman 10 meter dititik sounding 15. Kata kunci : Akuifer airtanah, geolistrik tahanan jenis, software IP2WIN, struktur lapisan tanah. THE MAPPING OF GROUNDWATER AQUIFER IN UNSRAT (MANADO BY USING THE GEO ELECTRIC OF RESISTIVITY METHOD ABSTRACT This research is intebded to map the existence of groundwater aquifer at Jl. Kampus Selatan Kecamatan Sario in Manadi city, based on resistivity of subsurface rock as exploration result is of geophysics by geo electric methode . The research consist of 18 sounding points which divided in 4 lines, that a model of this aquifer can be explored by geophysics method. This method can be use to see into subsurface structure based on the difference of rocks resistivity. This exploration result then proceeded by using IP2WIN software to see ground layers data based on resistivity values (2D) and the spread of the points in which the groundwater aquifer exists. Based on this subsurface ground layers structure, the groundwater aquifer layer of shallow groundwater is acquired with ρ 14,5 Ωm resistivity values. This can be found on sounding point 3 at depth of 2m. Aquifer with dept of 10m found in sounding point 15. Keyword : groundwater aquifer, geo electric resistivity, IP2WIN software, ground layers structure.

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Morán, Jefferson, and Esteban Inga. "Characterization of Load Centers for Electric Vehicles Based on Simulation of Urban Vehicular Traffic Using Geo-Referenced Environments." Sustainability 14, no. 6 (March 21, 2022): 3669. http://dx.doi.org/10.3390/su14063669.

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The current desire for people to reduce the environmental impact of their current lifestyle, as well as the variation in the prices of fossil fuels, has materialized in a rising trend for electric vehicles (EV). These vehicles are increasingly making inroads in the automotive market and positively contributing to reducing environmental pollution by greenhouse gas emissions; therefore, they improve energy efficiency. For the success of this innovation, it is necessary to correctly identify the effective places where the charging centers for electric vehicles (CCEV) will be placed, which will contribute significantly to its development, allowing us to guarantee the autonomy of electric vehicles with a charging supply. Thus, the present work proposes a vehicle traffic simulation process using the “SUMO” simulator interface. The study’s objective is to locate sites for electric vehicle charging centers or stations, taking as the primary variable the vehicular traffic that has a strong relationship with this type of research. Consequently, the study evaluates the existing resources in geo-referenced scenarios and has analyzed the vehicular flow considering the distances of the routes. As follows, the simulation becomes a tool to recommend the location and quantity of CCEV, guaranteeing users a nearby place where they can charge their vehicle and thus achieve adequate autonomy.

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Jeong, Juyeon, Hanna Jang, Desy Caesary, In Seok Joung, AHyun Cho, Daeung Yoon, and Myung Jin Nam. "Research Trends and Case Studies of Deep Learning Applications in Geo-electric and Electromagnetic Surveys." Journal of the Korean Society of Mineral and Energy Resources Engineers 59, no. 4 (August 31, 2022): 379–97. http://dx.doi.org/10.32390/ksmer.2022.59.4.379.

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Sinha, Rajiv, G. S. Yadav, Sanjeev Gupta, Ajit Singh, and S. K. Lahiri. "Geo-electric resistivity evidence for subsurface palaeochannel systems adjacent to Harappan sites in northwest India." Quaternary International 308-309 (October 2013): 66–75. http://dx.doi.org/10.1016/j.quaint.2012.08.002.

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Bingxiu, Bian, Wei Yanming, and Li Yong. "Key Technologies for the Application of the Electric Propulsion System on the GEO Satellite Platform." Measurement and Control 41, no. 3 (April 2008): 85–87. http://dx.doi.org/10.1177/002029400804100304.

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Likar, Justin J., Alexander Bogorad, Kevin A. August, Robert E. Lombardi, Keith Kannenberg, and Roman Herschitz. "Spacecraft Charging, Plume Interactions, and Space Radiation Design Considerations for All-Electric GEO Satellite Missions." IEEE Transactions on Plasma Science 43, no. 9 (September 2015): 3099–108. http://dx.doi.org/10.1109/tps.2015.2403272.

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Zhou, Feng, Huang Chen, Jingtian Tang, Zhiyong Zhang, Yuan Yuan, and Qihong Wu. "A comparison of φ formulae for three-dimensional geo-electromagnetic induction problems." Journal of Geophysics and Engineering 19, no. 4 (July 9, 2022): 630–49. http://dx.doi.org/10.1093/jge/gxac038.

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Abstract Geo-electromagnetic forward modeling problems are ill-posed due to the low signal frequencies being used and electrically insulating air space. To overcome this numerical issue, the $A - \phi $ formula using the magnetic vector potentials ($\bf A$) and electric scalar potentials ($\phi $) was developed. At present, there are two sets of $A - \phi $ formulae being used: one has a curl–curl ($\nabla \times \nabla $) structure and another one has a Laplace (${\nabla ^2}$) structure where the Coulomb gauge is enforced. The question as to which of the two approaches have superior performance for 3D geo-electromagnetic induction problems still remains open. In this study, we systemically compared the performances of these two $A - \phi $ systems in terms of both numerical accuracy and convergence rate. Numerical experiments suggest that for both magnetotelluric and controlled-source electromagnetic problems, the $A - \phi $ system with Laplace structure has better performance than the variant with curl–curl structure in terms of convergence rates.

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Yusuf, Solomon Nehemiah, Hilnan Christopher Drenkat, and Charity Mamza Azi. "Groundwater Exploration Using Vertical Electrical Sounding And 2D Electrical Resistivity Tomography In Shale Formation: A Case Study Of Sabongida, Plateau State, North Central Nigeria." Warta Geologi 48, no. 1 (April 28, 2022): 10–22. http://dx.doi.org/10.7186/wg481202202.

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Sabongida is characterized by lots of abortive boreholes which are often shallow as a result of the complex nature of shale formation in the area and limited application of integrated geophysical techniques before drilling of boreholes. The presence of shale formation in the area makes it extremely difficult to drill productive boreholes, while the existing hand dug wells are always shallow due to the difficulty in digging deeper wells, this and other factors motivated the choice of the study location for the purpose of proffering solutions to solve the perennial water problem in the area. Twenty-two (22) vertical electric soundings data (VES) using Schlumberger array with the aid of Ohms mega resistivity meter were conducted with electrode spread of AB/2 = 215 m and eleven (11) 2D electrical resistivity tomography data (ERT) using ADMT – 600 S - X equipment were acquired. ERT was conducted using 20 m as the length of each profile with 300 m in 10 profile lines and 400 m as the depth of probing. The result of the VES interpretation shows three to five geo-electric layers while the geo-electric section revealed the aquifers to consist of sandstones with varying thicknesses. Two groundwater potential zones were delineated as shelly sandstones and clayey sand. The different color band indicates the different layers within the ground as the soil resistivity varies, blue indicates low resistivity values, green - yellow indicates moderate resistivity values while high resistivity values are brown - red. The results from the 2D images indicate the low resistivity regions, suggesting aquifer is within the depths of 150 to 300 m. Thus, the recommended depths for drilling of productive boreholes are 180 to 210 m and 270 to 300 m in Sabongida.

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Burlov, Vyacheslav, Maxim Polyukhovich, Viktor Mankov, and Yulia Logvinova. "Development of safety management technology of electric power networks in order to sustainable development." E3S Web of Conferences 274 (2021): 10004. http://dx.doi.org/10.1051/e3sconf/202127410004.

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One of the fundamental principles of sustainable development is sustainable electric power supply to consumers. The implementation of this principle is possible only with guaranteed safety of electric power networks. Forecasting of possible threats is one of the tools to reduce the fault rate of technological equipment. Emergency shutdowns are largely caused by meteorological factors. The instability of meteorological conditions can lead to significant negative consequences for human life and activities. For forecasting and diagnosing meteorological conditions, it is advisable to use a territorial geo information system (GIS). Safety management processes requires the process creation with predefined properties. For safety management, it is recommended to use synthesisbased models, which makes it possible to apply an approach based on solving the inverse management problem. As a result of the study, the safety management technology of electric power networks based on the use of GIS was developed. The research considers threats caused by the impact of meteorological factors. In particular, some problems arising under the influence on the control object of environmental temperature, wind, and thunderstorm were analyzed. The presented simulation of safety management processes allows to guarantee reliable and safe electric power supply to consumers.

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Susilo, Adi, Fina Fitriah, Sunaryo, Eng Turniningtyas Ayu Rachmawati, and Eko Andi Suryo. "Analysis of landslide area of Tulung subdistrict, Ponorogo, Indonesia in 2017 using resistivity method." Smart and Sustainable Built Environment 9, no. 4 (May 16, 2020): 341–60. http://dx.doi.org/10.1108/sasbe-06-2019-0082.

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PurposeResearch has been conducted to analyze the landslide in Banaran area, Ponorogo Regency. The landslides occurred on April 1, 2017. This study was conducted to know the subsurface conditions in the Banaran area to analyze the disaster mitigation efforts. The mitigation efforts are made to reduce the risk from landslides and possible landslides.Design/methodology/approachThe method used is the geo-electric resistivity method of Wenner–Schlumberger configuration. The research was conducted in three villages namely Banaran Village, Bekirang Village and Mendak Village.FindingsThere are 12 resistivity measuring points with a track length of 410 m and a space of 10 m. The measured resistivity range is between 1.42 Ω.m and 67.500 Ω.m. The resistivity data and the local geological maps interpreted that the rocks in the Banaran area consist of clay, tuff lapilli, volcanic breccia and andesite lava. The landslide area begins at a depth of 8–35 m below the surface which is interpreted as tuff. Also, the thickness of the landslide material and the slope is = 400 which supports the occurrence of a more prominent landslide. The results of the parameter scoring of the landslide-prone areas indicated that the research area is very vulnerable to a landslide. The results of the interpretation indicate that the geo-electric resistivity method can provide a good overview for conducting landslide analysis, that is field slippage and potential material thickness occurrence landslide.Originality/valueThis article is very specific as it attempts to discover how prone Banaran are is to landslide.

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SOLODOVNIKOV, S., and T. SERHIYEVICH. "DEVELOPMENT OF ELECTRIC TRANSPORT IN THE REPUBLIC OF BELARUS ON THE BASIS OF PUBLIC-PRIVATE PARTNERSHIP IN THE CONDITIONS OF NEW GEOECONOMIC CHALLENGES AND THREATS." Экономическая наука сегодня, no. 14 (December 10, 2021): 21–28. http://dx.doi.org/10.21122/2309-6667-2021-14-21-28.

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The article is devoted to the study of the development of the sphere of production and consumption of electric transport in the Republic of Belarus. The principles that should be laid down in the management of the development of this sphere in the Republic of Belarus have been worked out: firstly, a systematic approach that allows to determine the directions and tools for the development of electric transport in the context of the ongoing structural policy and modernization of the national industrial complex; secondly, the development of all types of electric transport, including for the purposes of both passenger and freight traffic; thirdly, import substitution in the production of electric transport components in order to increase the localization of the production of high-tech goods; fourth, the implementation of the cooperative potential in the industry of the Union State in order to gain access to unique resources and sales markets and unification of technical regulations; fifth, financing of fundamental and applied research in the development of electric transport and ensuring the transfer of their results to the real sector of the economy; sixth, a variety of forms of state support for the production and consumption of electric transport and related infrastructure. It is concluded that, taking into account the world experience, the most promising mechanism for the development of electric transport in the new geo-economic conditions is the use of public-private partnership.

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Trofimov, Ivan, Leonid Trofimov, Sergei Podkovalnikov, Lyudmila Chudinova, Lev Belyaev, and Vladimir Savelév. "The computing and information system for research of prospective electric power grids expansion." Yugoslav Journal of Operations Research 29, no. 4 (2019): 465–81. http://dx.doi.org/10.2298/yjor181115021t.

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The paper describes the software tool implemented by Melentiev Energy Systems Institute SB RAS, aimed to solve wide range of energy issues. In this article, the Computing and Information System (CIS) means a software tool that provides collection, transfer, processing, storage, geo-visualization, and output of digital technical and economic data of different energy/power entities. Besides, this tool is incorporated within a mathematical model for optimization of expansion and operating modes of power systems. The paper discusses the example of how data storage and data representation in object-oriented database assist to improve efficiency of research prospective electric power systems expansion and operation.

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Yu, Liang, Tao Jiang, Yulong Zou, and Zhixin Sun. "Joint Energy Management Strategy for Geo-Distributed Data Centers and Electric Vehicles in Smart Grid Environment." IEEE Transactions on Smart Grid 7, no. 5 (September 2016): 2378–92. http://dx.doi.org/10.1109/tsg.2016.2542261.

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Journal articles on the topic 'Geo-electric'

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