Current Issue : April-June Volume : 2026 Issue Number : 2 Articles : 5 Articles
The article presents a series of studies on a new polymer binder in the form of an aqueous composition of MA-AANa/D in the aspect of its reusability in the casting process and its safe storage in landlls. FT-IR analysis conrmed that microwave radiation induces crosslinking of both the MA-AANa/D binder and the moulding sand containing it. It was found that after simple treatment of the microwave-cured binder, its original binding properties can be restored, as the hydrogen-bond networks formed under microwave irradiation are reversible. The bending strength ( ) tests of both fresh and regenerated moulding sands bonded with MA-AANa/D conrmed that the achieved curing degree meets the requirements for mould and core production. In addition, the biodegradability of the MAAANa/ D binder was evaluated using the Zahn-Wellens test. The progressive biodegradation was monitored through chemical oxygen demand (UV-Vis) measurements and the corresponding biodegradation degree (Rt). The results conrmed that MA-AANa/D is fully biodegradable in aqueous environments, as evidenced by an Rt value of 63.5% after 28 days of testing....
In modern environments, the brain is continuously exposed to numerous external stimuli, including the microwave radiation used in telecommunication technologies. It has been suggested that the absorption of this radiation by brain tissue can induce local heating. Because brain temperature influences neural activity, metabolism, and overall brain function, microwave-induced heating raises concerns over the safety of such technologies. Proper evaluation of the risks associated with microwave-based technologies thus requires accurate quantification of heating in deep organs without disrupting their physiology. This study, demonstrates that microwave-induced brain heating can be remotely monitored in vivo via luminescence thermometry using near-infrared luminescent silver sulfide (Ag2S) nanoparticles. Their temperature-dependent luminescence lifetime is a reliable thermometric parameter for the measurement of absolute brain temperature. The in vivo results offer direct, real-time evidence of brain heating (up to 4 °C) under telecom exposure conditions (3 GHz). Moreover, they establish lifetime thermometry as a reliable, minimally invasive approach for investigating thermoregulation in deep tissues even under external electromagnetic stimulation....
Graphene can effectively enhance the impedance matching and dielectric loss capability in dielectric loss/magnetic loss dual-mechanism absorbers, and influences the overall magnetic loss capability of the material through various mechanisms. In this study, carbonyl iron/graphene composite absorbers with different graphene contents were prepared using the solution blending method. An absorbing honeycomb structure was fabricated using aramid honeycomb as the substrate via an impregnation process. The complex permittivity and complex permeability of the materials were tested within the 2–18 GHz frequency band. The absorption capability and mechanism were comprehensively analyzed alongside the reflection loss curves. Furthermore, the influence of graphene on the magnetic loss capability of the dual-mechanism absorbing material was investigated through VSM tests. Research indicates that the content and distribution of graphene can enhance the dispersion of CIP. In addition to a significant improvement in dielectric loss, it also exerts an influence on magnetic loss through a synergistic mechanism....
Microwave permeability of amorphous Co67Fe7B26 films deposited on a flexible substrate was studied in a wide range of film thicknesses up to 1.40 μm. Microwave permeability measurements were carried out using the coaxial technique in the frequency range from 0.1 to 10 GHz. It was found that both the static permeability and the ferromagnetic resonance frequency depend weakly on the film thickness. Analysis of the microwave data showed that the studied films possess in-plane magnetic anisotropy. The influence of the skin effect on the frequency dependence of the microwave permeability was modeled using an analytical approach. It was demonstrated that the decrease in the peak of the imaginary part of the microwave permeability with film thickness growth is related to the skin effect. The results obtained may be useful for microwave applications of soft magnetic CoFeB films....
To address the challenge of achieving high-precision and ordered calibration of strongscatter points in inverse synthetic aperture radar (ISAR) images, this paper proposes a collaborative framework that integrates YOLOv12-pose with Peak-Constrained Watershed (PCW). The method first employs the YOLOv12-pose model to produce an initial localization of scatter points. PCW is then applied to fine-segment individual points. Finally, a three-stage global optimal matching strategy is introduced to achieve high-precision fusion between index labels and their geometric positions. Experimental results on a microwave photonic radar ISAR dataset demonstrated that the proposed method achieved an average error of 1.89 pixels, with accuracy, recall, and F1 scores exceeding 95%. The approach significantly outperformed standalone YOLO, Mask R-CNN, and traditional SVM-based methods while maintaining label consistency and substantially improving precision and robustness for the recognition, localization, and tracking of strong scatter points in ISAR imagery....
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