Yaroslav-the-Wise Novgorod State University

Magnetoelectric (ME) mechanical antennas typically have quality factor bounded by Chu-Harrington limit, which makes it challenging to improve the channel capacity & horbar;which is proportional to bandwidth & horbar;without severely compromising their efficiencies. To address this issue, a double H-bridge elastic substrate was incorporated into a ME array with composite of PZT/ferrite/Be-bronze tri-layered composite for device monolithic integration and efficient strain transfer, then the ME antenna was modeled, fabricated, and systematically characterized to demonstrate its substrate-assisted bandwidth superposition properties. A proof-of-concept supporting theory was established by elastodynamic and electrodynamic principles to reveal the parametric influence mechanism on bandwidth superposition. Experimental results demonstrated that the inter-structural multi-resonance coupling broadens the antenna -3 dB bandwidth by 3.84 & times; to 1120 Hz relative to a single ME unit, which was evidenced by ME response spectrum and underlying vibration dynamics. Furthermore, ASKmodulated communication tests achieved maximum data rate of 2kbps while maintaining a stable operational bandwidth of 1 kHz even under lossy cross-medium conditions. The Q & sdot;Rate product representing the trade-off between quality factor and channel capacity achieves 97, which is approximately 3.43 & times; greater than the maximum value of 28.32 reported so far. These advancements refine and enrich fundamental ME antenna theories while enabling integrated broadband antenna design for further practical implementation.

Relevance . Lactoferrin is a natural cationic iron-binding glycoprotein from the transferrin group. An important component of innate immunity, lactoferrin is a multifunctional protein with a broad spectrum of biological activity. Lactoferrin is widely used in pharmaceuticals and has potential application in animal husbandry. Methods. The search for potentially relevant articles was carried out by keywords in electronic databases and open Internet access. Results. A literature review revealed the antimicrobial, antifungal, antiviral, and immunomodulatory activity of lactoferrin. Lactoferrin is increasingly used in animal husbandry and veterinary medicine; however, the complexity of its production and purification hinders this process. The development and introduction of lactoferrin-based dietary supplements aimed at immunocorrection and strengthening the body of farm animals is promising. Lactoferrin can be used as a substance for the creation of a therapeutic agent in veterinary medicine. In addition, extensive opportunities could be created for the industry by creating herds of transgenic animals producing a biosimilar to human lactoferrin.

This article analyzes the reasons for the emergence of an anthropological interpretation of rhetoric in contemporary philosophy, as well as the problem of competing ideological meanings characteristic of the era of confrontation between two political systems and their inherent value orientations. In philosophy, this confrontation unfolds as a renewal, on new grounds, of the historical struggle between sophistry and Platonism for spiritual leadership in ensuring collective will. In doing so, the author provides an anthropological radicalization of the well-known epistemological problem posed by Plato to sophistry. In this regard, of particular interest are the elegant ways in which G. Blumenberg justifies the sophistic principle of "man as measure" in his works devoted to this anthropologically oriented rhetoric. The appropriateness of the advocated rejection not so much of Plato's ideal state as of the principles of truth-seeking in favor of effect and impression-making is analyzed. The author argues that anthropological rhetoric, as understood by G. Blumenberg, being the rhetoric of imperfect humanity, fails to overcome the metaphysical limitations of sophistry. Meanwhile, abandoning the disinterested, collaborative search for truth, in which people accept various versions of its analogy as reality, takes on the characteristics of a global doxic mirror, thereby transforming it into the rhetoric of the big data cave.

Magnetoelectric materials belong to the class of multiferroic structures in which electric polarization can be induced by the application of a magnetic field. In multilayer magnetoelectric elements consisting of magnetostrictive and piezoelectric layers, energy conversion occurs through mechanical coupling between the layers. Such structures can be used in sensors, automation systems, medical devices, and energy harvesting applications. Studies show that magnetoelectric elements can be effectively used in energy generators and can operate in both resonant and non-resonant modes. Experiments with elements of different dimensions (for example, $\mathbf{7 0} \times \mathbf{1 2} \times \mathbf{0 . 5 4 ~ m m}$) demonstrated that at a resonance frequency of about 21 kHz the output power can reach approximately 1 mW. The obtained results confirm the potential of magnetoelectric elements for the development of magnetoelectric generators. Moreover, the use of several elements operating in a resonant mode makes it possible to significantly increase the output power and enables such systems to be used for powering autonomous devices.

Magnetoelectric (ME) mechanical antennas, represented by strong ME coupling and efficient signal transmission under acoustic resonance, play an indispensable role in the emerging field of mechanically-driven VLF/LF communication. However, device further miniaturization through self-biasing techniques is constrained by substantial magnetic noise from conventional heterogeneous stacked configurations, posing indispensable challenges to communication stability. To address this issue, a full-gradient combinatorial co-fired technique was developed to synthesize monolithically-integrated nickel-zinc spinel ferrites (Ni1-xZnxFe2O4, 0.1 <= x <= 0.5) with magnetization gradient for constructing a self-biased, ultra-compact ME antenna. By precisely adjusting the Zn2 + compositional gradient, a magnetization gradient distribution was achieved within the monolithic ferrite, generating an internal magnetic field Hint(r) =-del Phi(r) that effectively replaces external bias. Experimental results demonstrate that the full-gradient co-fired ferrite samples achieved maximum dynamic magneto-mechanical coefficient (d33 m) of 20.98ppm/Oe and resonance ME voltage coefficient (MEVC) of 131.21 V/(cm & sdot;Oe) at zero bias, representing enhancements of approximately 4.33 & times; and 4.35 & times; , respectively, compared with homogeneous sample (x = 0.3) under comparative dimensions. Furthermore, the developed self-biased ME antenna exhibits a LOD (limit of detection) of 5pT with distance response strength of 10nT at 1 m, while achieving a competitive SNR (signal-to-noise ratio) of 69.89 dB relative to the counterparts reported so far. In amplitude-shift keying (ASK) modulated communication tests, the device successfully and stably received 20 bps ASK-modulated signals under air-saline lossy cross-medium conditions without distortion. This work marks a significant advancement in self-biased ME antenna miniaturization technology, offering a promising pathway for practical applications in high-frequency (HF)-denied environments with stringent demands of device portability and miniaturization & horbar; such as condition monitoring of subsea gas-insulated transmission lines (GIL) and underwater emergency communication.