High-Temperature Lightweight Ceramics with Nano-sized Ferrites for EMI Shielding: Synthesis, Characterization, and Potential Applications

The present study focuses on the synthesis and characterisation of a lightweight ceramic material with electromagnetic interference (EMI) shielding properties, achieved using mullite containing micrometre-sized hollow spheres (cenospheres) and CoFe2O4 nanoparticles. This research explores compositions with varying CoFe2O4 contents ranging from 0 up to 20 wt.%. Conventional sintering in an air atmosphere is carried out at a temperature between 1100 and 1300 °C. The addition of ferrite nanoparticles was found to enhance the process of sintering cenospheres, resulting in improved material density and mechanical properties. Furthermore, this study reveals a direct correlation between the concentration of ferrite nanoparticles and the electromagnetic properties of the material. By increasing the concentration of ferrite nanoparticles, the electromagnetic shielding effect of the material (saturation magnetisation (Ms ) and remanent magnetisation (Mr)) was observed to strengthen. These findings provide valuable insights into designing and developing lightweight ceramic materials with enhanced electromagnetic shielding capabilities. The synthe-sized ceramic material holds promise for various applications that require effective electromagnetic shielding, such as in the electronics, telecommunications, and aerospace industries

implementation of energy efficient smart technologies at the urban territories of the arctic zone of russia

Special climate conditions and out-of-date energy system at the urban territories of the Arctic zone of Russia reinforce the need for the development of a new concept for the implementation of energy efficient smart technologies at these territories. In this regard, the article is focused on identifying the prospects for the development of the energy sector of the urban territories of the Arctic zone of Russia with the involvement of smart technologies. Methods of the study include system analysis and modeling, which allow authors to consider the prospects of implementing energy efficient smart technologies in a comprehensive manner. Article suggests the interpretation of the concept of "energy efficient smart technologies" determines the priorities and introduces the models for the implementation of these technologies at the urban territories of the Arctic zone of Russia. The proposed concept and models were developed taking into account the modern information and communication infrastructure of the given territories. Particular attention was paid to the complex of characteristics influence the implementation of energy efficient smart technologies at the urban territories of the Arctic zone of Russia

Anomalous Proximity Effect in Underdoped YBaCuO Josephson Junctions

Josephson junctions were photogenerated in underdoped thin films of the YBa$_2$Cu$_3$O$_{6+x}$ family using a near-field scanning optical microscope. The observation of the Josephson effect for separations as large as 100 nm between two wires indicates the existence of an anomalously large proximity effect and show that the underdoped insulating material in the gap of the junction is readily perturbed into the superconducting state. The critical current of the junctions was found to be consistent with the conventional Josephson relationship. This result constrains the applicability of SO(5) theory to explain the phase diagram of high critical temperature superconductors.Comment: 11 pages, 4 figure

Design of Force Fields from Data at Finite Temperature

We investigate the problem of how to obtain the force field between atoms of an experimentally determined structure. We show how this problem can be efficiently solved, even at finite temperature, where the position of the atoms differs substantially from the ground state. We apply our method to systems modeling proteins and demonstrate that the correct potentials can be recovered even in the presence of thermal noise.Comment: 10 pages, 1 postcript figure, Late

Observation of narrow baryon resonance decaying into pKs0pK^0_s in pA-interactions at 70GeV/c70 GeV/c with SVD-2 setup

SVD-2 experiment data have been analyzed to search for an exotic baryon state, the $\Theta^+$-baryon, in a $pK^0_s$ decay mode at $70 GeV/c$ on IHEP accelerator. The reaction $pA \to pK^0_s+X$ with a limited multiplicity was used in the analysis. The $pK^0_s$ invariant mass spectrum shows a resonant structure with $M=1526\pm3(stat.)\pm 3(syst.) MeV/c^2$ and $\Gamma < 24 MeV/c^2$. The statistical significance of this peak was estimated to be of $5.6 \sigma$. The mass and width of the resonance is compatible with the recently reported $\Theta^+$- baryon with positive strangeness which was predicted as an exotic pentaquark ($uudd\bar{s}$) baryon state. The total cross section for $\Theta^+$ production in pN-interactions for $X_F\ge 0$ was estimated to be $(30\div120) \mu b$ and no essential deviation from A-dependence for inelastic events $(\sim A^{0.7})$ was found.Comment: 8 pages, 7 figures, To be submitted to Yadernaya Fizika. v3-v5 - Some references added, minor typos correcte

Клинические результаты лазерной хирургии базальных менингиом головного мозга

Methods of surgical treatment of patients with skull base meningiomas using high intensity infrared laser radiation (ND-YAG laser) at a wavelength of 1.06 micron were developed. The paper presents results of Nd-YAG laser application in skull base meningioma removal with assessment of its efficacy as compared with conventional surgical methods.Разработаны методы оперативного лечения больных с менингиомами основания черепа с применением высокоинтенсивного лазерного излучения инфракрасного спектра диапазона (ND-YAG-лазер) с длиной волны 1,06 мкм. В работе приводятся полученные данные по использованию его при удалении менингиом основания черепа различной локализации, проведена оценка эффективности его применения по сравнению с традиционными методами хирургии

Elastic-to-plastic crossover below the peak effect in the vortex solid of YBa2Cu3O7 single crystals

We report on transport and ac susceptibility studies below the peak effect in twinned YBa2Cu3O7 single crystals. We find that disorder generated at the peak effect can be partially inhibited by forcing vortices to move with an ac driving current. The vortex system can be additionally ordered below a well-defined temperature where elastic interactions between vortices overcome pinning-generated stress and a plastic to elastic crossover seems to occur. The combined effect of these two processes results in vortex structures with different mobilities that give place to history effects.Comment: 4 pages, 4 figures. Published in PRB Rapid Comm., February 1, 200

Клинические результаты хирургического лечения пациентов с парасагиттальными менингиомами, оперированных с использованием инфракрасного лазера

Despite a significant advance in microsurgery of the parasagittal brain meningiomas the problem of its surgical treatment is not closed at the present time. This is due to the fact that parasagittal meningiomas can ingrow to the sinus lumen. In this cases the possibility of tumor resection using conventional techniques is limited. Attempts at the tumor radical removal lead to a massive operating blood loss, a stable severe neurological deficit and decrease the quality of life. This results in high recurrence rate of parasagittal meningiomas also. The paper presents the results of ND-YAG laser use in the removal of parasagittal meningiomas with assessment of its application efficacy as compared with conventional techniques.Несмотря на значительные достижения в микрохирургии парасагиттальных менингиом головного мозга, проблема их оперативного лечения не может считаться закрытой. Связано это с особенностями расположения матрикса и способностью этих опухолей прорастать в просвет верхнего сагиттального синуса. Возможности радикального удаления при этом с использованием традиционных методик ограничены. Попытки тотально резецировать опухоль часто сопровождаются массивной интраоперационной кровопотерей, значительной травмой окружающего мозга и приводят к стойкому неврологическому дефициту и низкому качеству жизни оперированных больных. Кроме этого, остается высоким число рецидивирования парасагиттальных менингиом, что приводит к необходимости реопераций. В статье анализируются результаты оперативного лечения этой категории больных с использованием ND-YAG-лазера и проводится их сопоставление с аналогичными пациентами, оперированными традиционно

Dynamics and Radiation of Young Type-Ia Supernova Remnants: Important Physical Processes

We examine and analyze the physical processes that should be taken into account when modeling young type-Ia SNRs, with ages of several hundred years. It is shown, that energy losses in the metal-rich ejecta can be essential for remnants already at this stage of evolution. The influence of electron thermal conduction and the rate of the energy exchange between electrons and ions on the temperature distribution and the X-radiation from such remnants is studied. The data for Tycho SNR from the XMM-Newton X-ray telescope have been employed for the comparison of calculations with observations.Comment: 19 pages, 8 figure