Sources Of Electromagnetic Radiation Research Articles

On the characterization and correlation of the rock failure-induced electromagnetic radiation and micro-vibration

A complete understanding of the rock fracture-induced electromagnetic radiation (EMR) mechanism and the coupling relationship between EMR and micro-vibration (MV) is highly challenging in rock engineering. For this purpose, a pioneer study is conducted that uses the synchronous monitoring experiments of EMR and MV during rock failure under uniaxial compression by the three-axis electromagnetic antenna and droplet-like MV acceleration sensors. The time-frequency evolution characteristics and correlation of EMR and MV during the failure process of rock under load were obtained, and the EMR-MV coupling effect was analyzed. The obtained results show dominant synchronicity of EMR and MV during the rock's failure process. It is inferred that both EMR and MV are generated with fracture (stress drop), and the signal intensity is proportional to the stress drop; the correlation coefficient between EMR and MV peak value is >0.85. During the rock's failure process, the peak vibration acceleration can reach 105 m/s2, and the attenuation speed of the MV signals was relatively faster than the EMR. However, the dominant frequencies of the two are both concentrated in the low-frequency band (< 30 kHz). The dominant frequency band of EMR is generally less than 20 kHz, while MV showed a slightly wider band, reaching 30 kHz. Besides, almost every fracture generated similar or the same main frequency (with a difference of 1–2 kHz) EMR and MV signals, indicating a noticeable correlation in the frequency domain. The analysis shows that the vibration during the rock's fracture can be regarded as small damping vibration to a certain extent, thus theoretically explaining its faster attenuation. The high time-frequency correlation between EMR and MV indicates that the EMR induced by rock fracture seems to be resulted by the vibrating charged crack clusters. In addition, the maximum EMR peak value mostly appears along the Z-axis of the EMR antenna, which further verifies the rationality of the above hypothesis. In brief, the charge accompanying rock fracture is the physical basis of EMR, and the vibration during the fracture process constitutes the power source of EMR. The research results further clarify the mechanism of EMR induced by rock fracture and lay a theoretical foundation for constructing the EMR location method for rock fracture sources.

Rapid Online Oxidation of Proteins and Peptides via Electrospray-Accelerated Ozonation.

Mass spectrometry-based analyses of protein conformation continue to grow in utilization due their speed, low sample requirements, and applicability to most protein systems. These techniques typically rely on chemical derivatization of proteins and as with all label-based analyses must ensure the integrity of the protein conformation throughout the duration of the labeling reaction. Hydroxyl radical footprinting of proteins and the recently developed fast fluoroalkylation of proteins attempt to bypass this consideration via rapid reactions that occur on time scales faster than protein folding, but they often require microfluidic setups or electromagnetic radiation sources. In this work, we demonstrate that ozonation of proteins and peptides, which normally occurs in the second to minute time scales, can be accelerated to the submillisecond to millisecond time scale with an electrospray ionization source. This rapid ozonation results in selective labeling of tryptophan and methionine residues. When applied to cytochrome C and carbonic anhydrase, this labeling technique is sensitive to solution conditions and correlates with solution-phase analyses of conformation. While significant work is still needed to characterize this fast chemical labeling strategy, it requires no complicated sample handling, electromagnetic radiation sources, or microfluidic systems outside of the electrospray source and may represent a facile alternative to other rapid labeling technologies that are utilized today.

Plasma instability in graphene field-effect transistors with a shifted gate

We present detailed numerical analysis of the Dyakonov–Shur (DS) plasma instability in a DC biased graphene field-effect transistor (FET) with the gate shifted with respect to the middle of the transistor conducting channel. We show that the geometric asymmetry is sufficient to trigger the DS instability in the two-dimensional electron gas in the transistor channel. We demonstrate sustained plasma oscillations in the instability end point and analyze the properties of these oscillations for different positions of the gate and at different values of other physical and geometric FET parameters. The obtained results show the possibility of designing a tunable on-chip source of terahertz electromagnetic radiation based on the graphene FET with shifted gate.

Radiation effect of M-slot patch antenna for wireless application

Today, the specific absorption rate has become an important and necessary measurement when designing and implementing any type of antenna. In recent years, various devices have appeared that use different frequencies for wireless communication systems, which are a source of electromagnetic radiation. The M-slot antenna is designed in this paper to operate in multi-band frequencies for wireless communications using computer simulation technology (CST) software 2020. The radiation effect for this antenna is calculated for tissue mass of the human fingertips, which consists of three layers (skin, meat, and bone), over a mass of 1 g and 10 g according to the IEEE and International Commission on Non-Ionizing Radiation Protection (ICNIRP) organization. The results are shown three applications in the communication system, which are Wi-Fi, worldwide interoperability for microwave access (Wi-Max) and, satellite X-band and, the value of specific absorption rate (SAR) increase with increased frequency.

Electromagnetic emission from axionic boson star collisions

We explore the dynamics of boson stars in the presence of axionic couplings through nonlinear evolutions of Einstein's field equations. We show that, for large axionic couplings, isolated boson stars become unstable, and decay via a large burst of electromagnetic radiation, becoming less massive and more dilute. Our full nonlinear results are in good agreement with flat-space estimates for the critical couplings. We then consider head-on collisions of sub-critical boson stars and study the electromagnetic and gravitational signal. Boson stars cluster around the critical point via interactions, and we argue that mergers will generically be also sources of electromagnetic radiation, in addition to gravitational waves, which can be used to place constraints on the axionic coupling if such multimessenger signals are detected.

Assessment of the effect of electromagnetic radiation from cell phones using the Daphnia magna test object

Currently, the problem of electromagnetic safety of the population has acquired social significance and is an urgent issue for the modern development of the Republic of Kazakhstan, as well as for other countries of the world. Environmental exposure to radiofrequency electromagnetic fields from mobile phones has rapidly increased in the last two decades and this trend is expected to continue. Modern technologies have become a source of electromagnetic pollution generated electromagnetic fields. Due to the increase in technogenic processes and their influence on the Earth’s electromagnetic field, the topic of the influence of electromagnetic radiation on living organisms has been increasingly studied. All sources of electromagnetic fields, as a rule, are a source of complex electromagnetic radiation that affects plants, animals, insects and soil flora in the zone of influence of electromagnetic fields. The effect of the electromagnetic fields emitted from cell phones on living organisms and human health have become one of the most important topics for research because cell phones are widely used all over the world. In many countries, cellular communication occupies a special place among anthropogenic sources of electromagnetic radiation. A cell phone is a small-sized transceiver operating in the 900/1800 MHz range, which refers to damaging environmental factors. The influence of electromagnetic radiation of cell phones on the abundance of Daphnia magna was investigated. Radiation effects are clearly evident in the toxicology study with Samsung Galaxy J7 and Vivo V 20 cell phones. During the experiment, the radiation of these models of cell phones was established, and the abundance under the influence of Vivo V 20 was higher than under the influence of Samsung Galaxy J7, but lower than in the control group. Key words: electromagnetic radiation, electromagnetic fields, cell phone, Daphnia culture, amount, hydrobionts.

Effect of the Thickness of Nanoscale Layers of the Metal-Dielectric Structure on Its Optical Characteristics

A biosensor is a device which uses a mixture of biological and physicochemical components to detect molecular-level interactions. Essentially, biosensors detect the change in physical properties which occur when an immobilized biological molecule, such as an antibody or a protein, binds to their target analyte. A number of methods have been developed to determine interactions between bioreceptors and their analytes, many of which are based on the principle of Surface Plasmon Resonance, or SPR. The ubiquity of SPR comes from its inherent advantages; it allows real time, highly sensitive monitoring of a wide range of molecular interactions, without the requirement for additional labelling of samples. Surface Plasmon Resonance is caused by the interaction of electromagnetic radiation and the free-flowing cloud of electrons within a metal, a process which induces electromagnetic waves and, under certain conditions, resonance effects. Alterations in the physical conditions at the surface have a significant effect on this resonance, and the detection of these changes form the basis of the SPR biosensor. In the work, the effect of the thickness of the layers of the metal-dielectric structure on its optical characteristics was studied. The simulation was carried out for the Krechman configuration, which is a glass prism on which a multilayer metal-dielectric structure is applied. AuSiO2 was used as a metal-dielectric structure, and a laser beam with a wavelength of 633 nm was used as a source of external electromagnetic radiation. The thickness of the gold film varied from 1 to 60 nanometers. The lowest value of the reflection coefficient is reached at a thickness of 50 nm. The thickness of the silicon dioxide film varied from 1 to 30 nm. When the thickness of the dielectric layer is up to 10 nm, its influence on the optical characteristics is insignificant. Macroscopic values of parameters were used in the study, but it is known that real parameters differ greatly from macroscopic ones. To increase the accuracy of modeling the sensor element in further studies, it will be necessary to take into account dimensional changes in the optical parameters of the nanosized metal component in the structure of the sensor element.

Development of Wireless Sensor Network for Environment Monitoring and Its Implementation Using SSAIL Technology.

The Internet of Things (IoT) technology and its applications are turning real-world things into smart objects, integrating everything under a common infrastructure to manage performance through a software application and offering upgrades with integrated web servers in a timely manner. Quality of life, the green economy, and pollution management in society require comprehensive environmental monitoring systems with easy-to-use features and maintenance. This research suggests implementing a wireless sensor network with embedded sensor nodes manufactured using the Selective Surface Activation Induced by Laser technology. Such technology allows the integration of electrical circuits with free-form plastic sensor housing. In this work, a low-cost asynchronous web server for monitoring temperature and humidity sensors connected to the ESP32 Wi-Fi module has been developed. Data from sensor nodes across the facility are collected and displayed in real-time charts on a web server. Multiple web clients on the same network can access the sensor data. The energy to the sensor nodes could be powered by harvesting energy from surrounding sources of electromagnetic radiation. This automated and self-powered system monitors environmental and climatic factors, helps with timely action, and benefits sensor design by allowing antenna and rf-circuit formation on various plastics, even on the body of the device itself. It also provides greater flexibility in hardware modification and rapid large-scale deployment.

Problem of Increasing the Operating Frequency in Cherenkov Plasma Sources of Electromagnetic Radiation

Problem of Increasing the Operating Frequency in Cherenkov Plasma Sources of Electromagnetic Radiation

Complex analysis of the ionosphere variations during the geomagnetic storm at 20 January 2010 performed by Detection of Ionosphere Anomalies (DIA) software and DEMETER satellite data

Abstract. The Detection of Ionosphere Anomalies (DIA) software was developed and used for ionosphere research in the Institute of Space Technique and Technology of the National Center of Space Research and Technology (Almaty, Republic of Kazakhstan). The software was designed for ionosphere anomalies detection, identification, and analysis from satellite spectral and wave data from scientific payloads installed on the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite. The main task of DIA software is to provide the researcher with a convenient package for detection and identification of the sources of electromagnetic radiation, variations of the ionic and electronic components of the ionosphere, and other ionosphere parameters from satellite data. Using this software, a complex research of the state of the medium-latitude ionosphere during a geomagnetic storm on 20 January 2010 was done. Electric and magnetic components of the field in ultralow frequency (ULF), extremely low frequency (ELF), and very low frequency (VLF) bands are processed and analyzed, as well as temperature, velocity, and density of ionic and electronic plasma components and fluxes of energetic electrons at satellite altitude during a storm.

Влияние магнитных полей на ацетилирование H3K9/14 в нейронах грибовидных тел медоносной пчелы

Living things have been evolving under certain parameters of the geomagnetic field. Many organisms are sensitive to electromagnetic fields and use them for spatial orientation and navigation during migration. The honeybee Apis mellifera L. is a convenient experimental model to study the biological effects of electromagnetic fields. The honeybees use the Earth’s magnetic field for orientation in space and mobilization for foraging. Recent decades have seen an emergence of numerous anthropogenic sources of electromagnetic radiation. They are likely to be stressors for bees and other insects. It is known the transcriptional activity changes as part of stress response, while histone acetylation is associated with transcription activation. The article reports the results of the study into H3K9/14 histone acetylation in the neurons (inner Kenyon cells) of mushroom body calyxes (structures responsible for learning and memory in insects) in the honeybee. It was shown that an increase in the natural geomagnetic field leads to a decrease in H3K9/14 histone acetylation. This indicates a decrease in transcriptional activity in mushroom bodies, which may affect cognitive and foraging activities of the honeybee.

Broadband active antenna for monitoring electromagnetic radiation sources

Broadband active antenna for monitoring electromagnetic radiation sources

Dirty thunderstorms caused by volcano explosive eruptions in Kamchatka by the data of electromagnetic radiation

During volcano eruptions, so called dirty thunderstorms are the sources of electromagnetic radiation. They are caused by ash-gas clouds formed during explosive eruptions. Thunderstorm activity in an ash-gas cloud during volcano eruption is monitored by radio equipment. The VLF direction finder, located at Paratunka, monitors thunderstorm activity in the region of Kamchatka Peninsula including dirty thunderstorms accompanying explosive eruptions of Shiveluch and Bezymyanniy volcanoes. In the paper, we analyze records of electromagnetic radiation associated with dirty thunderstorms occurring during volcano eruptions from 2017 to 2020. During that period 24 eruptions of Shiveluch volcano and 5 eruptions of Bezymyanniy volcano occurred. Seventeen and three of them, respectively, caused dirty thunderstorms. Two-stage scenario of development is typical for all the dirty thunderstorms. The first stage lasts for 5–7 minutes and accompanies eruptive column development. However, if the eruption begins according to a smooth scenario, the first stage may be weak. The second stage lasts for 20–80 minutes and is associated with eruptive cloud formation and propagation. The intensity of this dirty thunderstorm stage depends on eruption power as well as on the interaction of an eruptive cloud during its propagation with the clouds of meteorological origin. Based on the obtained data, that is indicated by the increase of cloud-to-cloud stroke number.

Event Distortion-Based Clustering Algorithm for Energy Harvesting Wireless Sensor Networks

Wireless sensor networks (WSNs) consist of compact deployed sensor nodes which collectively report their sensed readings about an event to the Base Station (BS). In WSNs, due to the dense deployment, sensor readings can be spatially correlated and it is nonessential to transmit all their readings to the BS. Therefore, for more energy efficient, it is vital to choose which sensor node should report their sensed readings to the BS. In this paper, the event distortion-based clustering (EDC) algorithm is proposed for the spatially correlated sensor nodes. Here, the sensor nodes are assumed to harvest energy from ambient electromagnetic radiation source. The EDC algorithm allows the energy-harvesting sensor nodes to select and eliminate nonessential nodes while maintain an acceptable level of distortion at the BS. To measure the reliability, a theoretical framework of the distortion function is first derived for both single-hop and two-hop communication scenarios. Then, based on the derived theoretical framework, the EDC algorithm is introduced. Through extensive simulations, the performance of the EDC algorithm is evaluated in terms of achievable distortion level, number of alive nodes and harvested energy levels. As a result, EDC algorithm can successfully exploit both the spatial correlation and energy harvesting to improve the energy efficiency while preserving an acceptable level of distortion. Furthermore, the performance comparisons reveal that the two-hop communication model outperforms the single-hop model in terms of the distortion and energy-efficiency.

A new transient electromagnetic prospecting method in TBM tunnel environment

Tunnel boring machine (TBM) construction is a safe and efficient tunnel construction method at this stage, which contributes to the essential role of ahead prospecting methods, an essential prerequisite for ensuring the safety of TBM construction. Due to the high interference in the TBM tunnel environment, it is difficult to effectively apply multiple ahead prospecting methods. The existing geophysical methods are restricted because of the extremely small prospecting space in the TBM tunnel environment. Also, the TBM tunnel environment is required to introduce high-resolution detection methods. This paper proposes an ahead prospecting method suitable for TBM tunnel, using the simulation of three-dimensional vector finite element. Specifically, this prospecting method uses transient electromagnetic electrical radiation sources to emit and receives the Ex. Besides, the full field apparent resistivity imaging method is used to perform imaging interpretation of the adverse geological structures in front of the tunnel face in a semi-quantitative manner, to obtain the prospecting results required for the ahead prospecting in TBM tunnel.

Study on Environmental Characteristics Of Jupiter System And Spacecraft Protection Design

The Jovian system exploration is one of the important fields of deep space exploration in China in the future. The environments in Jupiter’s system are very complex. The exploration of the environments in Jupiter’s system is an important scientific goal. Besides that, the impact of space environment on the spacecraft is also a key factor that restricting the mission design. In this study, the characteristics and research status of gravity field, magnetic field, atmosphere/exosphere, electromagnetic radiation, high-energy particle radiation, plasma, and meteoroids in Jupiter’s system are analyzed. The gravity field model is an important basis for the design of the orbit and propulsion subsystem and the redundant model needs to be built. Jupiter strong magnetic field constraints the design of sensitive electromagnetic equipment in control subsystem. The main sources of electromagnetic radiation in Jupiter’s orbit include solar radiation, Jupiter/Satellite reflection radiation, and Jupiter infrared radiation. The exospheres of Jupiter’s moons are thin but include different kinds of atoms. The flux of plasma and high-energy particles in Jupiter’s orbit is much higher than that in Earth’s orbit. They can produce a variety of radiation effects. Among these the focus of protection is total dose and internal charging. The sources of meteoroids include interplanetary and Jupiter system. The risk of surface degradation or breakdown caused by collision between meteoroids and spacecraft should be avoided.

A Correlation-Based Electromagnetic Time Reversal Technique to Locate Indoor Transient Radiation Sources

To overcome the multipath interference in locating transient electromagnetic (EM) radiation sources in an indoor environment, we propose a criterion that calculates the correlation between back-propagated signals from observation points, to be used in EM time reversal (EMTR) algorithms. The method introduced in this article has three main advantages with respect to classical methods that use full-wave simulations and other criteria, such as maximum field strength. First, compared with full-wave techniques in the back-propagation phase, the proposed correlation-based method utilizes approximated transfer functions from the ray-tracing technique, which can improve the computation efficiency. Second, an inverted-loss model is used for the back-propagation, which could reduce the localization error caused by multipath effects due to signal attenuation and time delay. Third, the proposed correlation criterion has weak correlation with the source characteristics, which makes it applicable to the localization in indoor reflective environments with only two observation points. Several numerical simulations are carried out to assess the performance of the proposed method. The results indicate that the proposed correlation-based EMTR technique is able to locate radiation sources accurately and efficiently in indoor reflective environments.

Kinetic theory of monochromatic waves bunching in a low-voltage beam discharge in rare gases

The kinetic theory of phase focusing, that is bunching in a low-voltage beam discharge in rare gases (LVBD) during the propagation of longitudinal electrostatic oscillations at the Knudsen numbers of the order of unity have developed. The anomalous relaxation of the almost monoenergetic electron beam in momentum and energy is described for the case when this process cannot be explained by electron–atom collisions. The paper has shown the important role of electrons that have the beam energy and isotropic directional distribution, which is formed as a result of elastic collisions between the beam electrons and atoms. The dependence of the anomalous relaxation length on parameters of the LVBD in rare gases is studied.The developed theory makes it possible to quantitatively interpret experimental data on the LVBD under conditions when the electron mean free path is of the order of the interelectrode gap. According to these data, regardless of the density of the charged particles in the LVBD plasma in rare gases, five Langmuir plasma wavelengths fit along the length of the anomalous relaxation of the electron beam. The study of the electron beam dynamics laws in a plasma is important for the development of plasma-electrical devices, where the beam discharge is applied, namely: widely used all-movable stabilizers, sources of intense electromagnetic radiation, controlled elements of electronic circuits, plasma chemical reactors, etc.

On Measurement of Electromagnetic Radiation by Computer System in Indoor Electromagnetic Environment

The source of electromagnetic radiation in the computer system will not only cause biological effects of electromagnetic radiation on the human body, but also cause pollution to the ecosystem, so the measurement of the amount of electromagnetic radiation in the computer system is particularly important. In this paper, the current situation and types of electromagnetic radiation pollution and indoor electromagnetic environment in the computer system electromagnetic radiation measurement instruction, and electromagnetic radiation occupational protection measures are analyzed, for the reference of readers.

Exploration of the high-redshift universe enabled by THESEUS

At peak, long-duration gamma-ray bursts are the most luminous sources of electromagnetic radiation known. Since their progenitors are massive stars, they provide a tracer of star formation and star-forming galaxies over the whole of cosmic history. Their bright power-law afterglows provide ideal backlights for absorption studies of the interstellar and intergalactic medium back to the reionization era. The proposed THESEUS mission is designed to detect large samples of GRBs at z > 6 in the 2030s, at a time when supporting observations with major next generation facilities will be possible, thus enabling a range of transformative science. THESEUS will allow us to explore the faint end of the luminosity function of galaxies and the star formation rate density to high redshifts; constrain the progress of re-ionisation beyond zgtrsim 6; study in detail early chemical enrichment from stellar explosions, including signatures of Population III stars; and potentially characterize the dark energy equation of state at the highest redshifts.