Medical image segmentation is a key technology in computer-aided diagnosis systems. However, the accuracy of the existing segmentation models often falls short in practical applications. To improve the accuracy of the model, this paper proposes a novel U-shaped network called MMP-Net, meticulously crafted for medical image segmentation tasks. The MMP-Net incorporates three core modules: the multi-kernel convolution module, which enhances the multi-receptive field representation of the model; the multi-layer-guided channel attention module, which combines the features from different encoder layers, and the combined features are used to guide the channel attention; the phase-guided Laplacian convolution module, which leverages the boundary sensitivity of Laplacian convolution kernels to effectively capture edge gradient changes and local detail textures in images. The proposed MMP-Net has been validated with three metrics (Dice, HD95, and IOU) across five public medical image datasets (ISIC2017, ISIC2018, BUSI, COVID-19, PH2). Experimental results demonstrate that the MMP-Net outperforms other popular models in all these three metrics with moderate model parameters (2.03M) and computation (5.36G FLOPs). This achievement offers an efficient and accurate solution for medical image segmentation tasks, making it particularly suitable for mobile healthcare and edge computing scenarios. The source code will be available at https://github.com/liyiwei-png/MMP-Net.git
The paper presents the patterns of change of the electromagnetic radiation absorption coefficient values of in the frequency range of 2.0–17.0 GHz for an aluminum-foiled polymer film onto which three-dimensional spiral elements formed from aluminum foil with a thickness of 20.0 μm are attached. These patterns are presented depending on the diameter of these elements. Taking these patterns into account, the authors developed a technology for the manufacture of multilayer microwave absorbers based on three-dimensional spiral elements made of aluminum foil. This technology involves thermopressing the construction in the form of identical fragments of a synthetic non-woven fibrous material, between which 3D spiral elements made of aluminum foil are distributed, and adhesively bonding the resulting structure to a fragment of aluminum-foiled polymer film. Absorbers manufactured in accordance with the developed technology are characterized by a wider effective absorption band (12.0 GHz) compared to similar ones. They are also flexible and lightweight. This makes them suitable for use in creating partitions for zoning anechoic chambers or for covering the walls of these chambers.
The paper presents the results of a study on the structure and electrical properties of graphite-like amorphous carbon films deposited by electron-beam evaporation with vacuum heat treatment. The current-voltage characteristics of the films were analyzed in weak and strong electric fields in the temperature range from 25 to 155 °C. For the contact of carbon films with nickel, the Schottky barrier height was calculated based on the obtained current-voltage characteristics. It was found that in the temperature range of 25-45 °C, the mechanism of direct tunneling of charge carriers through the narrow Schottky barrier dominates (φb = 0.055 eV). In the range of 55-75 °C, a transition to the thermally assisted tunneling mechanism is observed (φb = 0.076 eV). At temperatures above 85 °C, charge carrier transport through the Schottky barrier occurs via thermionic emission (φb = 0.3 eV). The analysis of the current-voltage characteristics of graphite-like carbon films allowed us to establish the main mechanisms of hopping conductivity via localized states. It is shown that in the temperature range of 298-348 K, conductivity is determined by states near the Fermi level. The temperature interval of 348-428 K corresponds to conductivity through the band tail of localized states near the conduction band. It is shown that the increase in conductivity in strong electric fields is due to the Poole-Frenkel effect.
In this study, zinc oxide (ZnO) ceramics were synthesized by a modified Pechini sol-gel method, replacing conventional zinc nitrate with zinc acetate to provide a distinct chemical environment and avoid toxic emissions during heat treatment. To the best of our knowledge, this work represents the first time this acetate-based Pechini route is investigated from a thermoelectric perspective. This approach offers a scalable, inexpensive, and non-toxic route with precise compositional control. To enhance thermoelectric performance, the powders were doped with 2
