Institute of Engineering Physics

The purpose of the research is to find ways to increase the efficiency of the nanosatellite constellation (network) in the conditions of replenishment and retirement of spacecraft during operation in orbit based on a self-organizing mesh network, in which routing is carried out dynamically based on the connectivity of network elements. Methods are based on decision-making techniques, systems analysis, and decentralized control principles, enabling a nanosatellite network to independently reconfigure itself to meet changing operating conditions and task requirements. Using the properties of self-organization and adaptive control methods (distribution and responsiveness to change), the nanosatellite constellation maintains a configuration of satellites capable of exchanging data and service information. A two-level network reconfiguration method has been developed, enabling proactive changes to the composition of nanosatellites based on historical assessments of the quality and strength of transmitted signals. Algorithms for route list generation and route analysis have been developed, which can be executed autonomously on each nanosatellite in the constellation. Results . The developed reconfiguration method enables asynchronous addition and deletion of satellites from the network based on received or discovered information about their status and connections between satellites. It is shown that the decentralized approach has linear time complexity for the most critical algorithms for updating and constructing network routes. Conclusion . The developed reconfiguration method and algorithms for managing a nanosatellite constellation form the basis for developing network software that allows each satellite to autonomously make decisions about modifying its status and route list.

The storage ring lattice of the quasi-frozen spin type consisting of magnetic elements and Wien filters is considered. In this case, the spin rotation under the action of the Electric Dipole Moment (EDM) and the Magnetic Dipole Moment (MDM) with compensation for the MDM rotation is taken into account. The main characteristics of the structure such as the direction of the invariant spin axis and the spin precession frequency are derived. The spin characteristics of the ideal structure and the structure with misalignments of elements such as the rotation of magnets around the longitudinal axis are considered.

In the original publication [...].

Diabetes has become a global health challenge, driving the demand for innovative, non-invasive diagnostic technologies to improve glucose monitoring. Urinary glucose concentration, a reliable indicator of metabolic changes, provides a practical alternative for frequent monitoring without the discomfort of invasive methods. In this simulation-based study, we propose a novel asymmetric photonic structure that integrates Tamm plasmon polariton (TPP) modes and a cavity mode for high-precision refractive index sensing, with a conceptual focus on the potential detection of urinary glucose. The structure supports three distinct resonance modes, each with unique field localization. Both the TPP modes, confined at the metallic–dielectric interfaces, serve as stable references whose wavelengths are unaffected by refractive-index variations in human urine, whereas the cavity mode exhibits a redshift with increasing refractive index, enabling high responsiveness to analyte changes. The evaluation of sensing performance employs a sensitivity formulation that leverages either TPP mode as a reference and the cavity mode as a probe, thereby achieving dependable measurement and spectral stability. The optimized design achieves a sensitivity of 693 nm·RIU−1 and a maximum figure of merit of 935 RIU−1, indicating high detection resolution and spectral sharpness. The device allows both reflectance and transmittance measurements to ensure enhanced versatility. Moreover, the coupling between TPP and cavity modes demonstrates hybrid resonance, empowering applications such as polarization-sensitive or angle-dependent filtering. The figure of merit is analyzed further, considering resonance wavelength shifts and spectral sharpness, thus manifesting the structure’s robustness. Although this study does not provide experimental data such as calibration curves, recovery rates, or specificity validation, the proposed structure offers a promising conceptual framework for refractive index-based biosensing in human urine. The findings position the structure as a versatile platform for advanced photonic systems, offering precision, tunability, and multifunctionality beyond the demonstrated optical sensing capabilities.

Zirconium nitride (ZrN) nanoparticles (NPs) can offer appealing plasmonic properties for biomedical applications, but the synthesis of nontoxic, water-dispersible nanoformulations exhibiting plasmonic features in the biotransparency window presents a great challenge. Here, we report the synthesis, by methods of laser ablation, of small ZrN-based NPs, which are unique in combining photothermal heating and near-field enhancement in the transparency window. Depending on the synthesis environment, the formed ZrN-based NPs exhibit plasmonic absorption bands with maxima around 660–670 and 610–630 nm, which are largely red-shifted compared to what is expected from pure ZrN NPs. The observed shift is explained by the inclusion of zirconium oxide ZrOx (1 < x < 2) into NP composition and NP coating by naturally formed ZrOx. We then explored biophotonic applications of ZrN NPs. While pure NPs demonstrate their nontoxicity in vitro, their conjugation with anti-HER1 affibody ZHER1:1907 and subsequent photothermal heating with NIR-I laser cause 100% cancer cell death. In addition, profiting from the field enhancement, we demonstrate bioimaging functionality using a designed surface-enhanced Raman scattering probe based on an NP-conjugated azobenzene-CN-OH molecule as a Raman reporter. Combining a strong photothermal effect and the imaging option, laser-synthesized ZrN/ZrOx NPs promise a major advancement of theranostic modalities based on plasmonic nanomaterials.

Abstract Light diffraction is studied numerically and experimentally on a double fork‐shaped grating representing a periodic grating containing two spaced dislocations. The spatial dynamics of the phase singularities (optical vortices) has been investigated as a function of dislocation parameters. Produced optical vortices affect each other while propagating in a free space. For dislocations of the same topological charge, the propagation trajectories and their transverse displacement coordinates depend on the dislocation spacing, and the larger the dislocation spacing, the smaller the relative displacement of the optical vortices and the smaller their trajectory curvatures. For oppositely charged dislocations, three types of spatial behavior of optical vortices are found. The numerical results agree well with the experimental data.

At an experiment on acceleration of a polarized proton beam up to an energy at $$13\text{ GeV}$$ , the possibility of crossing the transition energy at $$5.7\text{ GeV}$$ by a jump is considered. The scheme of crossing by a rapid change of transition energy, assumes the longitudinal movement in Barrier Bucket RF near the zero value of the slip-factor. The jump itself is carried out in the absence of an RF field. The paper presents the influence of the above features on the dynamics of a polarized beam.

Penelitian ini bertujuan untuk mengatasi tantangan dalam menciptakan dan meningkatkan sistem audit internal dalam badan usaha. Ini mengeksplorasi peran penting audit internal dalam meningkatkan efisiensi produksi dan mengatur sistem pengendalian internal yang efektif. Terlepas dari pentingnya audit internal, terdapat kesenjangan dalam memahami dampak komprehensifnya terhadap operasi perusahaan. Penelitian ini bertujuan untuk mengevaluasi dan meningkatkan sistem pengendalian internal dan kegiatan audit internal, mengusulkan perbaikan untuk kinerja perusahaan yang lebih baik. Dengan menggunakan penilaian kualitatif dan studi kasus, hasil penelitian ini menggarisbawahi perlunya fungsi audit internal yang kuat untuk menyederhanakan operasi dan meningkatkan efisiensi organisasi. Temuan ini menyiratkan bahwa peningkatan praktik audit internal dapat memberikan kontribusi signifikan terhadap keberhasilan dan produktivitas bisnis secara keseluruhan. Highlight: Peran Audit Internal: Kunci dalam meningkatkan efisiensi produksi dan operasi perusahaan. Penilaian Sistem Pengendalian: Mengevaluasi sistem pengendalian internal pada badan usaha. Proposal Perbaikan: Merekomendasikan peningkatan aktivitas audit internal dan kinerja perusahaan. Kata Kunci: Audit Internal, Sistem Pengendalian Internal, Efisiensi Bisnis, Operasi Perusahaan, Peningkatan Audit