Electromagnetic Field Research Articles

Novel cisplatin-magnetoliposome complex shows enhanced antitumor activity via Hyperthermia

There are several methods to improve cancer patient survival rates by inducing hyperthermia in tumor tissues, which involves raising their temperature above 41 °C. These methods utilize different energy sources to deliver heat to the target region, including light, microwaves or radiofrequency electromagnetic fields. We have developed a new, magnetically responsive nanocarrier, consisting of liposomes loaded with magnetic nanoparticles and cis-diamminedichloroplatinum (II) (CDDP), commonly known as Cisplatin. The resulting magnetoliposome (ML) is rapidly internalized by lung and pancreas tumor cell lines, stored in intracellular vesicles, and capable of inducing hyperthermia under magnetic fields. The ML has no significant toxicity both in vitro and in vivo and, most importantly, enhances cell death by apoptosis after magnetic hyperthermia. Remarkably, mice bearing induced lung tumors, treated with CDDP-loaded nanocarriers and subjected to an applied electromagnetic field, showed an improved survival rate over those treated with either soluble CDDP or hyperthermia alone. Therefore, our approach of magnetic hyperthermia plus CDDP-ML significantly enhances in vitro cell death and in vivo survival of treated animals.

Broadband, Wide-Angle, and Versatile Metasurface Illusions with Inverse Synthetic Aperture Radar Imaging.

Generation of controllable illusions has raised widespread interest. Over the past few decades, this field has been revolutionized by the emergence of metamaterials and metasurfaces. However, current efforts utilizing single-layer metasurfaces are limited to simple illusion demonstrations by reproducing electromagnetic field distributions, which also struggle to achieve both broad bandwidths and wide angular ranges. Here, a nontrivial multi-layer illusion strategy is proposed utilizing the inverse synthetic aperture radar imaging. The customization of illusions is facilitated by correlating the phase dispersion of meta-atoms within the target frequency interval with the positioning of the structure. The approach enables the creation of illusions across a broadband of 8 to 12 GHz and a wide angular range from -30° to 30°. As a proof of principle, several illusions are experimentally demonstrated, showcasing the diversity of the approach. This work presents a viable illusion strategy that is more feasible for practical applications in the microwave domain, paving the way for future advances of customizable illusions.

Multi-bump solutions for critical Schrodinger equations with electromagnetic fields and logarithmic nonlinearity

Multi-bump solutions for critical Schrodinger equations with electromagnetic fields and logarithmic nonlinearity

Electromagnetic Field-Aware Radio Resource Management for 5G and Beyond: A Survey

The expansion of 5G infrastructure and the deployment of large antenna arrays are set to substantially influence electromagnetic field (EMF) exposure levels within mobile networks. As a result, the accurate measurement of EMF exposure and the integration of EMF exposure constraints into radio resource management are expected to become increasingly important in future mobile communication systems. This paper provides a comprehensive review of EMF exposure evaluation frameworks for 5G networks, considering the impacts of high-energy beams, the millimeter wave spectrum, network densification and reconfigurable intelligent surfaces (RISs), while also examining EMF-aware radio resource management strategies for 5G networks and beyond, with RIS technology as an assistive factor. Furthermore, challenges and open research topics in the EMF evaluation framework and EMF-aware resource management for 5G mobile networks and beyond are highlighted. Despite the growing importance of RIS technology in enhancing mobile networks, a research gap remains in addressing specific EMF exposure considerations associated with RIS deployments. Additionally, the impact of EMF-aware radio resource allocation approaches on RIS-assisted 5G networks is still not fully understood.

Revisiting the dynamics of a charged spinning body in curved spacetime

Abstract We analyze the motion of the spinning body (in the pole-dipole approximation) in the gravitational and electromagnetic fields described by the Mathisson-Papapetrou-Dixon-Souriau equations. First, we define a novel spin condition for the body with the magnetic dipole moment proportional to spin, which generalizes the one proposed by Ohashi-Kyrian-Semerak for gravity. As a result, we get the whole family of charged spinning particle models in the 
 curved spacetime with remarkably simple dynamics (momentum and velocity are parallel). Applying the reparametrization procedure, for a specific dipole moment, we obtain equations of motion with constant mass and gyromagnetic factor. Next, we show that these equations follow from an effective Hamiltonian formalism, previously interpreted as a classical model of the charged Dirac particle.

Local-photon model of the momentum of light

Recently we introduced a local photon approach for modeling the quantized electromagnetic field in position space. Using this approach, we define the momentum of light in this paper as in quantum mechanics as the generator for spatial translation. Afterward, we analyze the momentum dynamics of photonic wave packets which transition from air into a denser dielectric medium. Our analysis shines new light onto the Abraham-Minkowski controversy, which highlights the intricacies involved in the characterization of the momentum of the electromagnetic field. Although our results align with Minkowski's theory and with the definition of the canonical momentum of light in quantum electrodynamics, there are also some crucial differences. Published by the American Physical Society 2025

Charged spherically symmetric and slowly rotating charged black hole solutions in bumblebee gravity

In this paper, we study the scenario in which the matter field is an electromagnetic field nonminimally coupled to the bumblebee vector field. We present exact charged spherically symmetric black hole solutions and slowly rotating charged solutions in bumblebee gravity with and without a cosmological constant. The static spherically symmetric solutions describe the Reissner–Nordström-like black hole and Reissner–Nordström-(anti) de Sitter-like black hole, while the stationary and axially symmetric solutions describe the Kerr–Newman-like black hole and Kerr–Newman–(anti) de Sitter-like black hole. We utilize the Hamilton–Jacobi formalism to study the shadows of the black holes. Additionally, we investigate the effect of the electric charge and Lorentz-violating parameters on the radius of the shadow reference circle and the distortion parameter. We find that the radius of the reference circle decreases with the Lorentz-violating parameter and the charge parameter, while the distortion parameter increases with the Lorentz-violating parameter and the charge parameter.

A Neural Device Inspired by Neuronal Oscillatory Activity with Intrinsic Perception and Decision-Making.

Bionic neural devices often feature complex structures with multiple interfaces, requiring extensive post-processing. In this paper, a neural device with intrinsic perception and decision-making (NDIPD), inspired by neuronal oscillatory activity is introduced. The device utilizes alternating signals generated by coupling the human body with the power-frequency electromagnetic field as both a signal source and energy source, mimicking neuronal oscillatory activity. The peaks and valleys of the alternating signal are differentially modulated to replicate the baseline shift process in neuronal oscillatory activity. By comparing the amplitude of the peaks and valleys in the NDIPD's electrical output signal, the device achieves intrinsic perception and decision-making regarding the location of mechanical stimulation. This is accomplished using a single interface, which reduces data transmission, simplifies functionality, and eliminates the need for an external power supply. The NDIPD demonstrates a low-pressure detection limit (<0.02 N), fast response time (<20ms), and exceptional stability (>200000 cycles). It shows great potential for applications such as game control, UAV navigation, and virtual vehicle driving. The innovative energy supply method and sensing mechanism are expected to open new avenues in the development of bionic neural devices.

On-site quantitative detection of fentanyl in heroin by machine learning-enabled SERS on super absorbing metasurfaces

The global surge in opioid misuse, particularly fentanyl, presents a formidable public health challenge, highlighted by increasing drug-related mortalities. Our study introduces a novel approach for on-site quantitative detection of fentanyl in heroin, employing machine learning-enabled surface-enhanced Raman spectroscopy (SERS) on superabsorbing metasurfaces. The metasurface enables superior light absorption (>90%) across a broad wavelength range (580–1100 nm). This architecture facilitates significant electromagnetic field enhancement, over 2.19 × 107, ensuring high sensitivity, uniformity, and reproducibility. Our method precisely captured SERS signals across a detection range of 1–100 μg/mL in fentanyl solutions, fentanyl-heroin mixtures, and fentanyl-spiked saliva, demonstrating its versatility and practical utility. Incorporation of partial least squares regression into our analysis achieved over 93% accuracy in concentration predictions, eliminating the need for pre-data processing or specialized personnel. This marks a key advancement in rapid, accurate fentanyl detection, aiding the fight against the opioid crisis and improving public health safety.

Magnetic Pulse Powder Compaction

Powder metallurgy (PM) offers several advantages over conventional melt metallurgy, including improved homogeneity, fine grain size, and pseudo-alloying capabilities. Transitioning from conventional methods to PM can result in significant enhancements in material properties and production efficiency by eliminating unnecessary process steps. Dynamic compaction techniques, such as impulse and explosive compaction, aim to achieve higher powder density without requiring sintering, further improving PM efficiency. Among these techniques, magnetic pulse compaction (MPC) has gained notable interest due to its unique process mechanics and distinct advantages. MPC utilizes the rapid discharge of energy stored in capacitors to generate a pulsed electromagnetic field, which accelerates a tool to compress the powder. This high-speed process is particularly well-suited for compacting complex geometries and finds extensive application in industries such as powder metallurgy, welding, die forging, and advanced material manufacturing. This paper provides an overview of recent advancements and applications of MPC technology, highlighting its capabilities and potential for broader integration into modern manufacturing processes.

Fabrication of Silicon Surface Microstructures via Vortex Femtosecond Laser Irradiation for Reusable Substrates in SERS Applications.

Surface-enhanced Raman spectroscopy (SERS) is a key technique in analytical chemistry because of its exceptional sensitivity and specificity for detecting a broad spectrum of substances. Herein, a silicon (Si) substrate fabricated using vortex femtosecond laser beams in ambient air is proposed as an innovative, highly sensitive, and reusable platform for advanced SERS applications. The substrate has composite nanostructures adorned with bush-like formations on top of the elongated structures, which is a direct consequence of the orbital angular momentum of the vortex beam. Simulations conducted using COMSOL provide valuable insights into the distribution of hot spots and electromagnetic field across the substrate surface after gold nanoparticles deposition, underscoring the superior SERS detection capabilities of the fabricated substrate using vortex beams as compared to those processed by Gaussian beams. The vortex-fabricated substrate possesses remarkable reusability, stability, and time-resistance. It exhibited outstanding detection performance for malachite green and microcystin-LR, achieving limits of detection values of 3.91 pM and 2.69 pg·mL-1, respectively. Therefore, the Si substrates fabricated using a vortex femtosecond laser beam is an ideal candidate for advancing SERS sensors to new heights.

Reducing Operational Costs in Sulselbar’s 150 kV System with Electromagnetic Field and Sine-Cosine Optimization

Dynamic economic dispatch (DED) is a crucial task in modern power systems, requiring efficient optimization to minimize generation costs while satisfying operational constraints. This study introduces a Hybrid Electromagnetic Field Optimization with Sine-Cosine Algorithm (EMFO-SCA) tailored to address the unique challenges of the Sulselbar 150 kV power system. Specifically, the algorithm is designed to handle non-linear cost functions, complex constraints, and dynamic load variations across a 24-hour scheduling period. EMFO-SCA achieves a balanced integration of global exploration (via Electromagnetic Field Optimization) and local exploitation (via the Sine-Cosine Algorithm), resulting in robust optimization performance. Applied to a system with seven active generator buses, EMFO-SCA demonstrates an average operational cost reduction of 0.27% compared to the Kho-Kho Algorithm (KKA). This improvement translates to measurable cost savings while maintaining strict adherence to generation limits, ramp rate constraints, and power balance at all intervals. For instance, during peak demand at 521.52 MW (hour 12), the method effectively minimizes costs without compromising operational reliability. The dual-phase design of EMFO-SCA enables faster convergence and higher accuracy than conventional methods, making it a scalable solution for real-world DED challenges. By optimizing power generation schedules dynamically and reliably, this study establishes EMFO-SCA as a significant advancement in energy system optimization, with clear potential for practical deployment in similar power systems.

Assessment of Electromagnetic Interference (EMI) Effects in High-Voltage AC OHLs Adjacent to Underground Pipelines

The interaction between high-voltage transmission lines and nearby buried metallic pipelines can create electromagnetic fields that induce potentially dangerous voltages, posing safety risks. This paper explores the impact of electromagnetic interference on underground water pipelines located near a high-voltage transmission line (up to 380 kV) in Riyadh, part of the Saudi national grid. The study found that certain sections of the pipelines did not experience voltages beyond the standard safety limits under normal operating conditions. However, during Line-to-Ground fault scenarios (such as short circuits), the induced voltages exceeded safe thresholds. To mitigate this risk, gradient control wires were implemented to reduce the induced voltage and maintain compliance with safety standards. The research showed that adjusting the wire resistance could effectively lower these voltages, with a 10mΩ resistance proving adequate for this specific line. The findings and recommendations may vary depending on the specific design of the overhead line and the local geography. DOI: https://doi.org/10.52783/pst.1497

Plasmonic waveguide-mode based aluminum nanogratings for enhanced chemical and biological sensing in the UV regime

Abstract We have designed and modeled one dimensional narrow-gap aluminum nanogratings for plasmonic sensing of bulk and localized changes in the refractive index in the UV spectral region. The proposed configuration of the plasmonic sensors based on narrow-gap nanogratings allows normally light to be directly coupled into plasmonic waveguide modes in the gaps between the nanogratings, thereby alleviating the problem of employing bulky prism coupling mechanisms. The rigorous coupled wave analysis (RCWA) simulations were performed to optimize all the narrow-gap nanograting parameters such as the periodicity ‘P’, the gap between the nanograting walls ‘W’, and height ‘H’ of the nanogratings such that the plasmonic sensors based on these nanogratings operated in the UV spectral region and had the highest values of sensing performance characteristics. The plasmon resonance related dips in the reflectance spectra of these narrow-groove nanogratings can be tuned in the far-UV and deep-UV wavelength ranges by varying the different structural parameters of these nanogratings. Furthermore, we have defined other performance parameters like FOM bulk * and FOM localized * to account for the depth of the plasmonic resonance dip along with the sensitivity (S) and figure of merit (FOM). These narrow-gap nanogratings have localized regions of high electromagnetic fields inside the gaps between the nanogratings, which results in enhanced sensitivity of the proposed structures. We have calculated the maximum bulk sensitivity (S) of 190 nm RIU−1 with the figure of merit (FOM bulk *) of 2.567 RIU−1 in the UV region. Similarly, the highest localized sensitivity (S s) of 18.2 nm nm−1 and a figure of merit (FOM localized *) of 0.15356 nm−1 was obtained for the narrow-gap aluminum nanograting based plasmonic sensor. The high sensitivity achieved in localized and bulk sensing enables this configuration to be developed into a compact and highly robust sensor for chemical and bio-sensing applications.

Nonlinear Breit–Wheeler pair production using polarized photons from inverse Compton scattering

Abstract Observing multiphoton electron–positron pair production (the nonlinear Breit–Wheeler process) requires high-energy γ rays to interact with strong electromagnetic fields. In order for these observations to be as precise as possible, the γ rays would ideally be both mono-energetic and highly polarized. Here we perform Monte Carlo simulations of an experimental configuration that accomplishes this in two stages. First, a multi-GeV electron beam interacts with a moderately intense laser pulse to produce a bright, highly polarized beam of γ rays by inverse Compton scattering. Second, after removing the primary electrons, these γ rays collide with another, more intense, laser pulse in order to produce pairs. We show that it is possible to measure the γ-ray polarization dependence of the nonlinear Breit–Wheeler process in near-term experiments, using a 100 TW class laser and currently available electron beams. Furthermore, it would also be possible to observe harmonic structure and the perturbative-to-nonperturbative transition if such a laser were colocated with a future linear collider.

Is Industrial-Scale Wastewater Treatment Possible with a Commercially Available Atmospheric Pressure Plasma System? A Practical Study Using the Example of a Car Wash

The topic of water reuse is becoming increasingly important. It might be possible to use the well-known antibacterial effect of atmospheric pressure plasma due to its special mixture of reactive species, UV, and electromagnetic fields in a scaled-up, industrially interesting area to remove bacteria from wastewater, and thus, make it usable again. To review this question, water volumes of 5L and of different qualities (turbidity and different degrees of hardness) were treated with a commercially available plasma system. The change in water-specific values such as pH, EC, ORP, nitrate, and nitrite content was determined. To test the antibacterial effect, both direct and indirect treatment of the test germ Pseudomonas aeruginosa was conducted. In the first case, the inoculated water samples were plasma-treated, while in the second case, the water samples were treated before inoculation with the germ. The viable bacteria were counted via the spread plate method. The best reduction rate of at least 6 log levels was achieved when inoculated deionized water samples were treated directly with plasma. A significant reduction in viability was also observed in directly treated clear tap water samples, whereby the different degrees of hardness did not influence the effectiveness of the plasma. The bacterial load remained almost unchanged when reused water samples from a car wash were treated. Based on the results, a possible application in a car wash was discussed including a cost estimation and possible limitations.

Efficient SERS Substrate HOF@Au in Conjunction with DNAzyme-Mediated DNA Walker as a Signal Amplifier for the Ultrasensitive Detection of Lomefloxacin.

Lomefloxacin (LOM) is an efficacious antibiotic that might lead to liver damage and other adverse reactions if consumed over an extended period. Hence, this study proposed a DNAzyme-mediated DNA walker as a signal amplifier in combination with a substantial quantity of Au nanoparticle (NP)-loaded hydrogen-bonded organic frameworks (HOFs) as a surface-enhanced Raman scattering (SERS) substrate to accomplish the highly sensitive detection of LOM in food. Crucially, due to their high specific surface area and strong adsorption capacity, HOFs act as an ideal substrate for the in situ growth of a large amount of Au NPs, which exhibit a robust and uniform SERS enhancement. Once the target LOM was presented, the DNAzyme was activated to start the DNA walker and produce single DNA in abundance, which further triggered the catalytic hairpin assembly (CHA) cycle. In addition, the multi-interstitial core-shell structure of Au@Ag@4-nitrobenzenethiol (4-NTP)@Au@Hp3 produced more SERS "hot spots" and significantly amplified the local electromagnetic field, with HOF@Au synergistically strengthening the Raman signal of 4-NTP. Using this principle, this sensor achieved the ultrasensitive detection of LOM through the "signal on" strategy, with a detection limit as low as 4.62 × 10-14 mol/L. This strategy explored a meaningful innovative path for the design of a novel SERS biosensor for the sensitive and selective detection of antibiotics in food.

Effects of anthropogenic electromagnetic fields used for subsurface oil and gas exploration (controlled-source electromagnetics, CSEM) on the early development of Atlantic haddock (Melanogrammus aeglefinus).

Controlled source electromagnetics (CSEM) uses electromagnetic fields (EMF) to detect oil reservoirs. Atlantic haddock, Melanogrammus aeglefinus, is a commercially important demersal fish species that can potentially be impacted by such surveys due to potential overlap with egg distribution. In this study, haddock eggs were exposed to EMF, replicating CSEM survey conditions in a laboratory. Three different EMF intensities were used to replicate different distances between the EMF source and the organism. Exposures lasted for 15min. A worst-case scenario, i.e. 1h exposure at the highest EMF level was also carried out. None of the treatments caused malformations, mortality or affected hatching of eggs. However, EMF exposure induced tachycardia in newly hatched larvae and reduced the size of their yolk sac reserve. The effect was significant at the lowest EMF intensity (corresponding to 1000m between the EMF source and the exposed subject) and increased with exposure time and intensity.

Effects of 60 Hz Non- Uniform Electromagnetic Fields on Tomato (cv L-05) Seed Germination, Photosynthesis and Seedling Growth Under Salt Stress Conditions.

Effects of 60 Hz non-uniform electromagnetic fields (EMFs) on the tomato (cv. L-05) seed germination, photosynthesis, and seedling growth under salt stress and laboratory conditions were investigated. A previous trial investigated the impact of salt stress levels (0, 40, 60, 80, and 100 mM NaCl) on tomato seeds, and the 100 mM NaCl level was selected to study the effects of EMFs in attenuating salinity stress on germination, physiology, and growth of tomato seedlings. In the second experiment, untreated seeds and seeds treated with nonuniform EMFs of 2, 4 and 6 mT for 9 min were exposed to a 100 mM NaCl saline solution (SS). The results of the first bioassay showed that the addition of SS drastically reduced the germination percentage (67%), mean germination time (54%), mean germination speed (69%), germination rate index (39%), and germination vigor (78%) of tomato seeds when compared to the control treatment. In the second experimental trial, the effect of pretreatment of tomato seeds with EMFs of 2 or 4 mT for 9 min exposed to SS stress revealed a significant increase in the germination percentage (224%-226%) and germination rate (128%-151%). Salinity stress drastically reduced the tomato seed germination while 60 Hz nonuniform EMFs induced a mitigating response of tomato seeds under salinity stress to improve the germination, photosynthesis, and seedling growth. The 60 Hz nonuniform EMFs of 4mT for 9 min showed the best biological responses under salinity stress. Applied EMFs to tomato seeds protect tomato plants under salinity stress. Bioelectromagnetics. 00:00-00, 2024. © 2024 Bioelectromagnetics Society.

Dynamics of Energetic Heliospheric Ions in Pluto's Induced Magnetosphere

AbstractWe present a model of the interaction between energetic heliospheric ions and Pluto's induced magnetosphere. The electromagnetic fields near the dwarf planet are highly non‐uniform, displaying extended signatures of pile‐up and draping. While the induced magnetosphere possesses a downstream extension above 100 Pluto radii, the weak interplanetary magnetic field in the outer heliosphere leads energetic ions to gyrate on comparable length scales. We obtain the three‐dimensional structure of the fields near Pluto using a hybrid model, and a particle tracing tool is applied to study the dynamics of energetic ions traveling through these fields. For multiple initial energies, we compute the ion fluxes through a plane detector downstream of Pluto. Our results are as follows: (a) Deflection by Pluto's induced magnetosphere causes highly non‐uniform perturbations in the flux pattern of energetic ions at its downstream side. These patterns include regions where the fluxes are increased or reduced by up to 40%, compared to the values in uniform fields. (b) Consistent with findings from New Horizons, the modeled perturbations gradually diminish with distance downstream of the dwarf planet out to 200 Pluto radii. (c) The deflection of the energetic ions mainly occurs within regions of Pluto's induced magnetosphere where the magnetic field is significantly enhanced, thereby causing a localized reduction in gyroradii. (d) The magnitude of the depletion in flux in our steady‐state model is weaker than seen by New Horizons; this may suggest that time‐dependent processes in Pluto's wake (e.g., bi‐ion waves) play a major role in deflecting these ions.