Готові списки джерел за темами / Electromagnetic fence

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Добірка наукової літератури з теми "Electromagnetic fence"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Electromagnetic fence"

Amirkhanyan, Mariya, and Fedor Bryukhan. "Shielding effect of reinforced concrete fences in electromagnetic fields of industrial frequency." MATEC Web of Conferences 251 (2018): 06006. http://dx.doi.org/10.1051/matecconf/201825106006.

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Electromagnetic fields (EMF) are one of the main types of physical pollution of the environment in urban lands. The danger of adverse impact of EMF on human health increases with growth of electric power consumption. Therefore, the issues of protection of the population against EMF impact are becoming very important. One of the options for protection against EMF exposure is the use of reinforced concrete fences with shielding properties. Despite the simplicity of such a device against EMF, it can be stated that shielding effect assessment issues are poorly known. The objective of this paper is to assess the shielding effect of reinforced concrete fences in EMF industrial frequency. The shielding effect of the reinforced concrete fences study was conducted on the surrounding area of the thermal power plant (TPP), located on the edge of Mytishchi city of the Moscow Region. The effects of an abrupt increase in the EMF intensity in front of the reinforced concrete fence and its decrease behind the fence are revealed. It is found that these effects are associated with the concrete reinforcement impact inside the fence, in which an alternating electric current is generated. The shielding effect determines the partial reflection of EMF in front of the fence and decrease of EMF inside it. Accounting for the shielding effect of reinforced concrete fences provides perspectives of organizing the protection of the population near residential and industrial buildings, as well as protection of personnel working in the strong EMF areas.

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Cho, Yong-Heui. "High performance metal-only fan-beam reflectarray with a delta source applicable for an electromagnetic fence." International Journal of Contents 7, no. 4 (December 28, 2011): 44–49. http://dx.doi.org/10.5392/ijoc.2011.7.4.044.

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Shein, Alexandr N., Svetlana Yu Artamonova, Vladimir V. Potapov, Nickolay O. Kozhevnikov, and Vladislav E. Ushnitskii. "THE ELECTROTOMOGRAPHY SURVEY IN DIFFICULT GEOTECHNOGENIC CONDITIONS AT THE PEACEFUL UNDERGROUND NUCLEAR EXPLOSION "CRYSTAL" SITE." Interexpo GEO-Siberia 2, no. 3 (May 21, 2021): 61–68. http://dx.doi.org/10.33764/2618-981x-2021-2-3-61-68.

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The paper presents the results of measurements in 2019 by electrotomography at the site of the emplacement hole of the peaceful underground nuclear explosion "Crystal", carried in 1974 at a depth of 98 m in permafrost Cambrian carbonate rocks, and the neighboring forest area. The fence made of metal poles and barbed wire around the site, and the buried fragments of the casing of the emplacement hole create significant interference of measurements. To avoid the electromagnetic noise, the measured data of the apparent electrical resistivity was cleaned manually. Data inversion was performed in the Res2Dinv program. Geoelectric models, namely two-dimensional sections of the upper part of the geological environment to a depth of up to 80 m, were obtained. To verify the models, forward modeling was performed using the ZondRes2D program.

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Osinowo, Olawale Olakunle, Michael Oluseyi Falufosi, and Austin Ejimunkonye Okafor. "Integrated Very Low Frequency Electromagnetic (Vlf-Em) Geophysical And Hydrogeochemical Study Of Abeku Dumpsite In Ibadan, Southwestern Nigeria." GeoScience Engineering 64, no. 2 (June 1, 2018): 40–51. http://dx.doi.org/10.2478/gse-2018-0011.

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Abstract Very Low Frequency Electromagnetic (VLF-EM) and hydrogeochemical studies have been integrated to measure ground conductivity and also determine the concentration of leachate derived contaminants in the groundwater around Abeku dumpsite in Ibadan, southwest Nigeria. Ten (10) VLFEM profiles were occupied within and around the dumpsite fence. Water sample from wells were also analyzed to determine the concentration of pollutants in the study area. Qualitative interpretations of VLF-EM results indicate relatively high ground conductivity within the dumpsite, which decreases away from the actual waste dump phase of the dumpsite. Ground conductivity is relatively higher in the south and east of the dumpsite which are located downhill of the groundwater hydrostatic head when compared with the north and west of the study area situated uphill of hydraulic gradient. Hydrogeochemical analyses present NO3−, SO42− and PO42− ions concentration in the range of 9.24 – 13.64 mg/L, 3 – 12 mg/L and 0.33 – 1.07 mg/L respectively. The SO42− and PO42− ions concentrations are within permissible limits, while the NO3− ion concentration is slightly above the Federal Ministry of Environment’s standard for potable water in Nigeria.

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Aguirre, Jerry, Marcos Vargas, and Paul Garland. "Radiation Mechanisms and Electromagnetic Interference in Ceramic Electronic Packages." International Symposium on Microelectronics 2012, no. 1 (January 1, 2012): 000628–37. http://dx.doi.org/10.4071/isom-2012-wa36.

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A full-wave electromagnetic analysis for characterizing typical electromagnetic shielding practices in ceramic electronic packages is presented. Typically in printed circuit board emissions, the power plane emissions, and exposed surface nets are considered, however, the signal interconnect from the PCB to an electronic package can also be a significant source of radiation and hence an electromagnetic interference (EMI) issue. In this paper we describe electromagnetic radiation mechanisms resulting from high-frequency and high-speed applications in ceramic multilayer electronic packages and review the typical practice of implementing via fences to mitigate and reduce the EMI risk within a package substrate and also for the case when the package is part of a package/board configuration.

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Hussein, Ahmed Ali. "Using rectangular trace to reduce the crosstalk of the coupled microstrip lines." International Journal of Engineering & Technology 5, no. 1 (December 29, 2015): 7. http://dx.doi.org/10.14419/ijet.v5i1.4771.

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New electronic products must have high-speed, small size and lower voltages supply. With such layout, signal integrity (SI) becomes an actual important issue because sensitive equipment is affected on electromagnetic interference (EMI). Crosstalk is a major factor in signal integrity (SI) of printed circuit boards (PCBs). Crosstalk noise is usually represented in terms of Near-End crosstalk (NEXT) and Far-End crosstalk (FEXT). Crosstalk is a common problem that degrades circuit performance. To reduce this problem, via hole-fences connected by guard trace between double microstrip lines are used, in this case the crosstalk will be reduce by 6 dB than use 3W rule, but when it replaced by rectangular metal the crosstalk was reduce by 7dB, is better than use via hole-fences by 1 dB. The simulation result was done by using FEKO 5.5 simulator.

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Ferguson, I. J., W. J. Taylor, and K. Schmigel. "Electromagnetic mapping of saline contamination at an active brine pit." Canadian Geotechnical Journal 33, no. 2 (May 8, 1996): 309–23. http://dx.doi.org/10.1139/t96-009.

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Frequency-domain and time-domain electromagnetic methods were used to investigate groundwater contamination at an active brine pit in southwestern Manitoba, Canada. The objectives of the survey were to delineate contamination suspected to be occuring at the site and to compare frequency-domain electromagnetic (FDEM) and time-domain electromagnetic (TDEM) measurements in a survey area containing pipelines, fences, and power lines. The survey successfully delineated a region of high conductivity around brine pit, confirming that leakage is occurring from the pit. Modelling of the FDEM results suggests the contamination is spreading within a series of shallow sand units. Comparison of FDEM and TDEM survey results indicate that small-separation FDEM systems are much more useful for mapping in a developed area containing sources of cultural noise. The FDEM systems permit rapid mapping of spatial variations in conductivity, are affected to only a limited degree by cultural features, and provide some resolution of the depth variation of conductivity at shallow depth. It was not possible to obtain useful TDEM measurements anywhere near the active brine pit because of the signal distortion in the late-time response. Key words: geophysics, electromagnetic, brine pit, saline contamination.

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Krueger, Daniel, Ken Peterson, and Laurie Euler. "Electromagnetic Isolation Solutions in Low Temperature Cofired Ceramic (LTCC)." International Symposium on Microelectronics 2011, no. 1 (January 1, 2011): 000760–67. http://dx.doi.org/10.4071/isom-2011-wp3-paper5.

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Low Temperature Cofired Ceramic (LTCC) is a commercial ceramic-glass multilayer technology with compelling advantages for microelectronics, microsystems and sensors. High frequency applications require good electrical properties such as low dielectric los,s and newer applications require extreme isolation from electromagnetic interference (EMI) that is even difficult to measure (−150db). Approaches to providing this isolation, once provided by via fences, have included sidewall coating and full tape thickness features (FTTF) that have been introduced by the filling of slots with via-fill compositions. Several techniques for creating these structures have been modeled for stress and temperature effects in the face of other necessary attachments, such as metallic seal frames. The relative effects of attachment media, FTTF geometry, and alternative measures will be reported. Approaches for thick film and thin film implementations are described.

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Qian, Wei, and David E. Boerner. "Electromagnetic response of a discretely grounded circuit—An integral equation solution." GEOPHYSICS 59, no. 11 (November 1994): 1680–94. http://dx.doi.org/10.1190/1.1443556.

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We derive an integral equation to describe the electromagnetic response of a discretely grounded circuit. This investigation is relevant to the study of man‐made structures such as metallic fences, grounded powerlines, and pipelines, all of which may fall into the class of discretely grounded conductors. The solution developed here is an extension to existing circuit theory and takes into account the self and mutual interaction of the circuit elements. It is possible to ignore these interactions at low frequencies where the grounding impedances dominate the effective impedance of the circuit. However, at frequencies where the electromagnetic skin depth is comparable to the length between adjacent grounding points, the effective impedance of the circuit is proportional to frequency, and the inductance of the circuit dominates its electromagnetic response. Within the quasi‐static limit (i.e., where displacement currents can be neglected) electromagnetic excitation by either horizontal electric or vertical magnetic dipoles produces a constant primary electric field at high frequencies (far‐field). Thus, the electric current in the discretely grounded circuit will always be inversely proportional to frequency for these types of sources. Horizontal magnetic dipole or vertical electric dipole sources generate primary electric fields that are proportional to the inverse square root of frequency in the high frequency limit of the quasi‐static domain, and thus the current in a circuit excited by such sources will decrease as the inverse of square root of frequency. The integral equation solution derived here can be used to investigate the influence from cultural conductors on actual electromagnetic surveys and also provides further insights into the current channeling response of surficial conductors.

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Cuinas, Inigo. "An Introduction to Cybersecurity at Physical Layer: Obstacles at Radio Channel to Mitigate Hackers’ Chance." Elektronika ir Elektrotechnika 26, no. 6 (December 18, 2020): 58–65. http://dx.doi.org/10.5755/j01.eie.26.6.28006.

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Cybersecurity commonly focuses on higher layers of Open Systems Interconnection (OSI) model, as it is a discipline associated to Computer Science. However, physical layer is the front line of the defence of a system against external attacks, and Electrical Engineering, concretely Radiofrequency Engineering, can provide tools to reinforce radio networks also in terms of information security. This paper analyses different techniques related to site shielding. From hard traditional shielding, similar to Faraday cages, to different soft shielding solutions as vegetation fences and frequency selective surfaces (FSS), the variety of solutions is broad and would be useful in actual deployments. Finally, Building Information Modelling (BIM) appears as an interesting tool that could be incorporated along the design and construction of an office building to improve the electromagnetic behaviour, and subsequently the cybersecurity issues of the communication networks hosted by the building itself.

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Дисертації з теми "Electromagnetic fence"

Колесник, Константин Васильевич, та Г. М. Виноградов. "Радиолучевые охранные средства с фазированными антенными решетками". Thesis, ИЦ "Политехпериодика", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/26946.

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Представлен обзор результатов работ, связанных с исследованиями технических средств охраны объектов различного назначения, которые проводились с участием авторов в течение ряда лет. Одним из таких средств являются электромагнитные заборы. Предложено использовать в системах формирования электромагнитного поля заданной формы в качестве излучателей микрополосковые фазированные антенные решетки (ФАР). Показаны основные направления совершенствования радиолучевых охранных средств с ФАР.

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Тези доповідей конференцій з теми "Electromagnetic fence"

Koh Wee Jin, Tan Joo Huat, and K. C. H. Ernest. "High frequency (HF) suppression with a shielded fence." In 17th International Zurich Symposium on Electromagnetic Compatibility. IEEE, 2006. http://dx.doi.org/10.1109/emczur.2006.215015.

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Ege Engin, A., and Jesse Bowman. "Virtual ground fence options for shielding power plane noise." In 2014 IEEE International Symposium on Electromagnetic Compatibility - EMC 2014. IEEE, 2014. http://dx.doi.org/10.1109/isemc.2014.6899016.

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Ipekoglu, Yasin, O. Mert Yucedag, Safak Saraydemir, and Hasan Kocer. "Microstrip patch antenna array design for C-band electromagnetic fence applications." In 2015 9th International Conference on Electrical and Electronics Engineering (ELECO). IEEE, 2015. http://dx.doi.org/10.1109/eleco.2015.7394587.

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Khorrami, Mohammad Ali. "Optimized virtual ground fence for power delivery filtering of mixed-signal systems." In 2014 IEEE International Symposium on Electromagnetic Compatibility - EMC 2014. IEEE, 2014. http://dx.doi.org/10.1109/isemc.2014.6898995.

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Engin, A. Ege, and Jesse Bowman. "Virtual ground fence: A methodology for GHz power filtering on printed circuit boards." In 2012 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC). IEEE, 2012. http://dx.doi.org/10.1109/apemc.2012.6237970.

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Ciccomancini Scogna, Antonio, Antonio Orlandi, Tzong-Lin Wu, and Ting-Kuang Wang. "Analysis and design of GHz power noise isolation using 45° rotated photonic crystal fence." In 2011 IEEE International Symposium on Electromagnetic Compatibility - EMC 2011. IEEE, 2011. http://dx.doi.org/10.1109/isemc.2011.6038399.

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Jong Ho Kim and Dong Chul Park. "A simple method of crosstalk reduction by metal filled via hole fence in bent transmission lines on PCBs." In 17th International Zurich Symposium on Electromagnetic Compatibility. IEEE, 2006. http://dx.doi.org/10.1109/emczur.2006.214946.

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Tan, Dunlin, Jong Jen Yu, David Hee, Zhi Hong Liu, Philippe Eudeline, Dominique Baillargeat, and Beng Kang Tay. "A light-weight electromagnetic shield using high density carbon nanotube fence-wall for RF packaging." In 2015 IEEE MTT-S International Microwave Symposium (IMS2015). IEEE, 2015. http://dx.doi.org/10.1109/mwsym.2015.7166849.

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Brewczyński, Konrad, Marek Życzkowski, Mieczyslaw Szustakowski, Łukasz Olszewski, Piotr Markowski, Mateusz Karol, and Leon Jodłowski. "Laboratory and field tests of the active composite fence with integrated fiber optic modalmetric sensor and electromagnetic sensor." In 11th Integrated Optics - Sensors, Sensing Structures and Methods, edited by Tadeusz Pustelny, Przemyslaw Struk, Pawel Mergo, and Jacek Wojtas. SPIE, 2016. http://dx.doi.org/10.1117/12.2244525.

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Li, Shulan, Yuan'an Liu, and Bihua Tang. "Analysis of Radiation Reduction of Coupled Microstrip Lines By Additional Via Fences." In 2007 International Symposium on Electromagnetic Compatibility. IEEE, 2007. http://dx.doi.org/10.1109/elmagc.2007.4413553.

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