MIREA — Russian Technological University (RTU MIREA) is The Federal State Budget Educational Institution of Higher Education «MIREA — Russian Technological University» (RTU MIREA) is a higher educational institution in Moscow, which is a modern educational, research and innovation complex.
New model of the waveguide structure based on the graded-index photonic crystal structure with attenuating refractive index with a distance and nonlinear crystal with the Kerr-type nonlinear response disappearing with an increase in the light intensity is proposed. Both cases of the sign of the Kerr nonlinearity coefficient corresponding to the disappearance of self-focusing and defocusing nonlinearity are considered. New exact solutions to the nonlinear contact boundary problem in explicit form are found. The light intensity distribution using obtained exact analytical solutions are described and analyzed with variation of the optic structure parameters. Two types of the transverse distribution of the light intensity corresponding to the surface wave characterized by one maximum, and monotonic attenuation in field with a distance from the interface and the waveguide modes characterized by several intensity peaks formed in graded-index photonic crystal structure are described by obtained exact solutions. It is shown that formation of the waveguide modes occurs with an increase in the interface dielectric constant.
Solution-combustion-synthesized powders were used to obtain Bi1-xBaxFeO3 ceramics (0 <= x <= 0.20) with A-site Ba2+ substitution; sintering was performed at 600 degrees C. X-ray diffraction and Raman spectroscopy confirm rhombohedral BiFeO3 as the primary phase, whereas highly doped compositions contain trace amounts of BaCO3 (<= 7 %). Broadband measurements (1 kHz-1 MHz, 25-500 degrees C) show that epsilon ' increases with Ba content and exhibits a reproducible anomaly at 310-320 degrees C; at 1 kHz and room temperature, the permittivity of BBFO20 is nearly twice that of BFO. The ac-conductivity displays a low-frequency, nearly frequency-independent (dc-like) plateau for T > 325 degrees C followed by a power-law region; the frequency exponent s decreases from similar to 0.63 -0.44 to similar to 0.01 and remains approximate to 0 above 400 degrees C, consistent with correlated-barrier hopping. Arrhenius analysis of sigma(ac)(T) resolves several temperature regions with distinct activation energies E-a. At room temperature, the M - H loops remain unsaturated up to +/- 17 kOe, while M-s, M-r, and H-c increase monotonically with x (from M-s approximate to 0.40 to 2.50 emu/g; H-c approximate to 31 to 78.68 Oe at x = 0.20). Owing to this combination of improved dielectric stability, reduced loss, and enhanced room-temperature magnetization, the synthesized powders show strong potential for applications in multifunctional capacitors, magnetic sensors, tunable microwave components and magnetoelectric device architectures.
Scene graph generation provides a compact structured representation for visual perception, but accurate and fast graph prediction from images and videos remains challenging. Recent VLM-based methods can generate scene graphs end-to-end as structured text, yet often produce long outputs with irrelevant objects and relations. We present SceneGraphVLM, a compact method for image and video scene graph generation with small visual language models. SceneGraphVLM serializes graphs in a token-efficient TOON format and trains the model in two stages: supervised fine-tuning followed by reinforcement learning with hallucination-aware rewards that balance relation coverage and precision while penalizing unsupported objects and relations. For videos, the model can optionally condition each frame on the previously generated graph, providing lightweight short-term context without tracking or post-processing. We evaluate SceneGraphVLM on PSG, PVSG, and Action Genome. With compact VLMs and vLLM-accelerated decoding, SceneGraphVLM achieves a strong quality-speed trade-off, improves precision-oriented SGG metrics while preserving reasonable recall, and generates complete scene graphs with approximately one-second latency. Code and implementation details are available at: https://github.com/markus0440/SceneGraphVLM.git.
A series of adamantane-based amino acid derivatives incorporating γ-aminobutyric acid (GABA) as a spacer, with the general structure Ad-CH2-CO-GABA-X-OMe (where X represents L-tryptophan (Trp), L-histidine (His), H-Ala-((S)-2-oxopyrrolidin-3-yl)-OMe (Pld), or L-methionine (Met)), were synthesized and evaluated in vitro for their antiviral activity against rimantadine-resistant influenza A virus strains A/Moscow/78/2020(H1N1)pdm09 and A/Cheboksary/125/2020(H1N1)pdm09. The results demonstrated that the presence of an L-tryptophan residue is crucial for effective inhibition of influenza virus replication, with the corresponding derivative exhibiting potent activity at an IC50 of 0.5 µg/mL. A comparative analysis of structural features and antiviral properties was conducted between the adamantane derivatives and analogous derivatives of the closo-decaborate anion ([B10H10]2-) functionalized with identical amino acid residues Na2[B10H9-O(CH2)2O(CH2)3C(O)-X-OCH3] (X = Trp, His) and spacers of comparable length. This study suggests that combining adamantane-based compounds with closo-decaborate clusters could lead to the development of highly effective therapeutic compositions with enhanced efficacy and improved safety profiles.
The newly formulated non-Newtonian rivulet flows streaming down an inclined planar surface, with additional periodic perturbations arising from the application of the 2nd Stokes problem to the investigation of rivulet dynamics, are demonstrated in the current research. Hereby, the 2nd Stokes problem assumes that the surface, with a thin shared layer of the fluid on it, oscillates in a harmonic manner along the x-axis of the rivulet flow, which coincides with the main flow direction streaming down the underlying surface. We obtain the exact extension of the rivulet flow family, clarifying the structure of the pressure field, which fully absorbs the arising perturbation. The profile of the velocity field is assumed to be Gaussian-type with a non-zero level of plasticity. Hence, the absolutely non-Newtonian case of the viscoplastic flow solution, which satisfies the motion and continuity equations, is considered (with particular cases of exact solutions for pressure). The perturbed governing equations of motion for rivulet flows then result in the Riccati-type ordinary differential equation (ODE), describing the dynamics of the coordinate x(t). The approximated schematic dynamics are presented in graphical plots.
