Structural Units Research Articles

Densification and network structural changes in binary aluminosilicate glass via cold sintering process

Binary aluminosilicate glasses containing 20–50 wt% Al2O3 were successfully densified through a cold sintering process (CSP) using 1–10 M NaOH solutions. The investigation focused on densification and structural unit changes in the cold-sintered binary aluminosilicate glasses. Specifically, the binary aluminosilicate glass with 40 wt% Al2O3, cold-sintered at 180 °C using 1–10 M NaOH solutions, achieved a relative density of up to 90 % at 10 M NaOH. This was attributed to an enhanced dissolution-precipitation process facilitated by an increased concentration of the NaOH solution. In aluminosilicate glasses with 20–50 wt% Al2O3, the relative densities approached 90 % after CSP at 180 °C using a 10 M NaOH solution. Al(OH)3 formation in the cold-sintered glasses was confirmed, particularly at higher concentrations of NaOH solution (>10 M) and higher contents of Al2O3 (>40 wt%). Changes in Si structural units were observed during CSP, with Al-rich Si units becoming dominant as the concentration of the NaOH solution increased. The higher substitution of Si-O-Si bonds by Si-O-Al bonds led to the precipitation of Al(OH)3, as well as an increased Vickers hardness and biaxial flexural strength of the cold-sintered glasses. These findings demonstrate that the Al2O3 content and NaOH concentration play important roles in the densification and enhancement of the mechanical property in the cold-sintered alumina-rich binary aluminosilicate glasses and offer insights into the optimal conditions for obtaining desirable aluminosilicate materials through CSP.

POWER SUPPLY UNIT OF THE STAND AND LABORATORY INSTALLATION FOR TREATING OLIVES WITH ELECTROSTATIC FIELD

Most technological machines (TM) use hydraulic drives and internal combustion engines, such as lifting and transporting, loading and unloading, construction, road, track, and mining. Increasing the durability of the specified TM units is an urgent task. One of the possible solutions to this urgent problem is the electrostatic treatment of hydraulic oils and diesel fuels. Over the past three decades, researchers have conducted many studies focused on finding optimal means of using external force fields to improve the quality of lubricating materials and intensify their production. Types of influence of force fields, such as mechanical, mechanochemical, acoustic, electromagnetic, and electric, are increasingly used to regulate the behaviour of dispersed particles in nonpolar and slightly polar environments. The theory of regulated interphase transitions proves that the emergence, growth, and size change of supramolecular structures, surrounded by an adsorption-solvate layer and creating complex structural units in oil dispersion systems, contribute to the emergence of new properties of these systems. One of the main provisions of this theory is the need for extreme and antibating changes in the size of complex structural units with the help of external influences, which include force fields. Lubricating materials differ in their degrees of dispersity, composition, and properties, so the effect of force fields on them is diverse. The ability to regulate intermolecular interactions and the size of complex structural units are significant in the operation of lubricants. Electric fields make it possible to control phase interactions in these dispersed systems: they increase the constant dipole moments of particles and the electrosurface forces, which contribute to the deformation of the electric double layer. Under the action of strong electric fields, structural changes occur in hydrocarbon dispersion systems, which significantly change the physicochemical properties of lubricating materials. Thus, the dynamic viscosity of the lubricant and its resistance to deformation may change depending on the chemical nature of the system. Previously conducted experimental studies allow us to formulate the requirements for the stand in detail, which enables investigation of the properties of petroleum-based liquids. Thus, it is possible to achieve increased anti-wear properties of petroleum-based liquids when the liquid passes through the gap between the electrodes in an electrostatic field. The voltage between the electrodes should be U = 1000–1500 V, and the speed of the liquid movement in the space between the electrodes should be V = 4.5–6.5 m/s. The power supply unit of the stand for electroprocessing petroleum-based liquids, proposed in this paper, meets these requirements. The article proposes a fundamentally new scheme for the power supply unit of the laboratory stand for direct current electrotreatment of petroleum-based liquids. The power supply unit is a bipolar source of adjustable direct current. It provides smooth regulation of the voltage from 0 to 3000 V and step regulation of the output current. The block has double protection against short circuits at the output and input. Keywords: anti-wear property, oil, influence of an electrostatic field on the anti-wear properties of oil, device for electrostatic treatment of oil.

Micro‐Ring Morphology of Ag7NCs and Light‐Induced Reversible Interconversion of FCC Ag14NCs via Cu2+ ions‐Mediated Particle‐Assisted Reversible Interconversion

AbstractDespite the remarkable progress made on intercluster conversion in atomically precise metal nanoclusters (MNCs) and their self‐organization to develop microscopic molecular architecture with well‐defined size and shape, achieving light‐induced reversible structural transformation and the development of micro‐ring self‐assembly in MNCs have, so far, remained elusive. The present investigation touches on these two long‐standing quests by showcasing a new route, light‐induced Particle‐Assisted Reversible Interconversion (PARI) for the reversible transformation from Face Centered Cubic (FCC) Ag14NCs to Ag7NCs. Our studies reveal that the lack of plasmonic silver nanoparticles (AgNPs) in the system results in the formation of Ag7NCs with metallic kernels having centrosymmetric crystal packing. The molecular self‐organization of Ag7NCs through various non‐covalent interactions such as C−H⋅⋅⋅O, C−H⋅⋅⋅H−C, and C−H⋅⋅⋅π leads to the formation of micro‐ring morphology, a unique molecular architecture in MNCs. The in situ generated AgNPs due to the acceleration of the reaction kinetics by Cu2+ ions facilitate the growth of Ag14NCs with FCC metallic kernel. These two structural units of AgNCs show light‐induced reversible structural transformation which is also associated with the reversible tuning of their spectroscopic and morphological signatures. This PARI‐guided interconversion strategy put forward a most appropriate example of a structure–property relationship in MNCs.

SCIENTIFIC-TECHNICAL AND PRODUCTION POTENTIAL OF UKRAINE FOR THE PRODUCTION OF SCIENTIFIC PRODUCTS OF DIESEL CONSTRUCTION

In this work, an attempt is made to provide an assessment of the prospects for the development of automotive diesel engineering in Ukraine, the availability and preservation of scientific, technical and production potential for the continuation of the production of knowledge-intensive products of this domestic sub-industry in modern conditions. According to the authors, the manufacturers of vehicles in Ukraine quickly found the support of the State regarding the inclusion of the relatively most complex structural units of the car design - the engine and the chassis - in the list of imported components, since the manufacture of these parts requires high-tech processes that ensure the manufacture of low-quality parts. Other personal opinions of the authors have been expressed regarding the reasons for the absence of energy sources that ensure the economic development of the country and are considered science-intensive products in the modern domestic automotive industry. According to the results of the research, it was established that the list of developments of the domestic automotive diesel industry in recent years extends from the two-cylinder diesel engine of the ZIM-800D four-wheeled motorcycle, which was proven to be introduced into the series, and the ZIM-1901 and ZIM-1902 microcars, to the design documentation of the modern six-cylinder diesel engine 6DTNA2 with a four-valve cylinder head and electronic fuel injection system. As an example of the capacity of the domestic production potential, the production technology of the cylinder head of a four-cylinder diesel engine 4ChN 8.8/8.2 was worked out with the involvement of available production resources and the use of imported components. This approach makes it possible to significantly reduce the time for the manufacture and preparation of the production of structural elements of the domestically produced engine, which is a representative of the "Slobozhansky diesel" power series.

Micro-Ring Morphology of Ag7NCs and Light-Induced Reversible Interconversion of FCC Ag14NCs via Cu2+ ions-Mediated Particle-Assisted Reversible Interconversion.

Despite the remarkable progress made on intercluster conversion in atomically precise metal nanoclusters (MNCs) and their self-organization to develop microscopic molecular architecture with well-defined size and shape, achieving light-induced reversible structural transformation and the development of micro-ring self-assembly in MNCs have, so far, remained elusive. The present investigation touches on these two long-standing quests by showcasing a new route, light-induced Particle-Assisted Reversible Interconversion (PARI) for the reversible transformation from Face Centered Cubic (FCC) Ag14NCs to Ag7NCs. Our studies reveal that the lack of plasmonic silver nanoparticles (AgNPs) in the system results in the formation of Ag7NCs with metallic kernels having centrosymmetric crystal packing. The molecular self-organization of Ag7NCs through various non-covalent interactions such as C-H⋅⋅⋅O, C-H⋅⋅⋅H-C, and C-H⋅⋅⋅π leads to the formation of micro-ring morphology, a unique molecular architecture in MNCs. The in situ generated AgNPs due to the acceleration of the reaction kinetics by Cu2+ ions facilitate the growth of Ag14NCs with FCC metallic kernel. These two structural units of AgNCs show light-induced reversible structural transformation which is also associated with the reversible tuning of their spectroscopic and morphological signatures. This PARI-guided interconversion strategy put forward a most appropriate example of a structure-property relationship in MNCs.

The role of national and international standardization activities in the process of post-war reconstruction of Ukraine

The article analyzes the role of national and international norm-project activities in the process of post-war reconstruction of Ukraine. It is proved that in the conditions of the Russian-Ukrainian war, which is of an aggressive nature on the part of the aggressor, great troubles and destruction have been caused to our people and their state, which have manifested themselves in numerous human casualties, disintegration and destruction of the basic everyday and critical infrastructure of territorial communities, destruction and the actual devastation of large territories, which makes it virtually impossible for a person to exist and function in the relevant territory, limits his opportunities to organize his stable and predictable life cycle, as well as to satisfy existential needs, efforts, and interests. However, the war itself objectifies and actualizes the issue of the post-war restoration of the state and its TG, and this, in turn, puts on the agenda the issues of rule-making by the public authorities of the state and subjects of international relations, including member states of the international community and their associative and structural units - international intergovernmental and intergovernmental organizations, including, first of all, the important stage of norm-making - norm-project activity. It is argued that norm-projecting activity at the national and international levels in the process of post-war recovery of Ukraine plays an important methodological and praxeological significance, because the principles of post-war recovery of Ukraine and its TG: a) quite clearly, clearly, unambiguously reflect and determine the fundamental directions, forms and guidelines of norm-projecting activity public authorities of the state; b) even more, they are aimed at the unambiguous formation and formulation of the rights and obligations of the subjects of social relations that will arise in the process of post-war recovery; c) must be adequately taken into account and reflected in the relevant standard-setting activity of public state authorities, as well as, and this is especially important, in the standard-setting of local self-government bodies; d) they form the foundations of state legal and municipal legal policy in the field of post-war reconstruction. At the same time, the lion’s share of the above principles of the post-war reconstruction of Ukraine and its TG has a significant impact on the international level - their practical implementation cannot be implemented without significant financial assistance from foreign partners. And this, in turn, actualizes and contextualizes the normative-drafting activity of public authorities of Ukraine (including local self-government bodies) in the field of international contract law, including normative-drafting work in the field of international inter-municipal cooperation, as well as general international cooperation.

Role of CsBr in structure and properties of new cesium bromo-borate glasses

Glasses of enlarged chemical composition in the xCsBr-(100-x)B2O3 system, with x = 30–80 mol% have been prepared and studied for the first time. The hydrothermal preparation method is used to prepare fine powdered samples. The X-ray Diffraction (XRD), Fourier Transform Infrared spectra (FTIR) and 11B Nuclear Magnetic Resonance (11B NMR) are the tools used to study the structure of glasses. Even at the high CsBr concentration (30–60 mol%), XRD results revealed an amorphous structure characterized most of the examined compositions. But glasses enriched with CsBr (70 and 80 mol%) possess some ordered sub-structures impeded in the main amorphous network. 11B NMR and FTIR spectroscopy confirmed the presence of BO3 triangle as the major and dominant structural units. The four coordinated boron (BO4), on the other hand, can't be detected in the all analyzed compositions. An extremely low concentration from BBr4 tetrahedral groups (boron coupled with Br) is formed. The B-O bonds of planar BO3 triangles, which are the fundamental units, were involved in the production of amorphous clusters of the type Cs4B5O9]Br. Density (D) measurement and calculating molar volume (Vm), packing density and free volume(Vf) have been studied. The added CsBr can't play a role of modifier but it might be inserted interstitially between the borate structural units causing increasing of molar volume and free space in the glass network structure. The results based on transmission electron microscopy (TEM-EDP) and X-ray diffraction pattern (XRD) are in good agreement, indicating that the amorphous-clustered species are developed in the studied glasses.

The Relationship of Transposable Elements with Non-Coding RNAs in the Emergence of Human Proteins and Peptides

: Transposable elements are the oldest structural and functional units that were formed during the emergence of life on Earth. The most ancient properties of transposable elements are the multifunctionality of their transcription and translation products and the formation of their many variants through processing, due to which transposable elements are key evolutionary sources of long non-coding RNAs, circular RNAs, microRNAs, proteins and peptides formation. Moreover, the same type of transposon can simultaneously serve as the source of the origin of all these molecules, providing the adaptive properties of living organisms, especially complex eukaryotes, including humans. The ancient ability of transposable elements for mutual integration due to their protein products interacting with DNA and RNA molecules, as well as for mutual regulation due to the functionality of their RNA, is the basis for the origin of many proteins and non-coding RNAs characterized by the same properties. This can explain the emergence of transcription factors from transposable elements, that is, proteins capable of interacting with the structures of DNA molecules due to the presence of specific amino acid sequences derived from transposable elements. This article presents facts about the origin during the evolution of many protein and non-- coding RNA genes from transposable elements. Specific proteins and peptides translated from long non-coding RNAs, pri-microRNAs and circular RNAs are described, which reflect the origin of non-coding RNAs from transposable elements in evolution. These proteins and peptides are promising tools for the treatment of viral infections and drug-resistant tumors, since, together with non-coding RNAs, they are involved in antiviral and antitumor responses.

Electrolytic manganese residue and red mud co-treatment: Synthesizing zeolite X and adsorbing leaching solution from electrolytic manganese residue

Electrolytic manganese residue (EMR) and red mud (RM) are solid wastes from electrolytic metallic manganese and alumina production. These wastes continue to accumulate, causing significant environmental damage and resource waste. To solve these problems, porous zeolite X (ERZ) was synthesized with EMR and RM as the main raw materials. ERZ was then employed to adsorb the leaching solution generated during EMR purification. Also, an investigation was carried out to ascertain the most favorable parameters for the synthesis of zeolite, and the resulting ERZ was characterized. The results indicated that the synthesized ERZ exhibits excellent crystallinity, high thermal stability, and a large specific surface area. Next, solid-state NMR (SSNMR), XRD, and Raman spectroscopy were used to characterize the ERZ synthesis process: the structural units of X zeolite are β cages and 4Rs. Additionally, the study examined the adsorption impact of ERZ on impurity ions in the leaching solution, revealing that the adsorption mechanism is chemisorption. Furthermore, the effective regeneration of ERZ demonstrated its significant practical utility. To summarize, this study presents a new feasible way for effectively utilizing EMR and BA.

Blogging in the field of higher education: theoretical and practical experience of leading HEIs of Europe

Methods. The results were obtained through the use of empirical research methods (description of the components of blogging and activities of higher educational institutions in the blogosphere), theoretical methods (analysis, synthesis, abstraction, generalization, explanation, classification of blogging in the field of education). The study covers socio-communication, system and functional approaches, content analysis, elements of SWOT analysis. Results. It is substantiated that the main parameters of an educational blog are the topic, structure and format of content, criteria for publication, dynamics of publications, rules of participation, confidentiality, protection of intellectual property. The principles on the basis of which an educational blog should be created and developed are highlighted, namely: purposefulness, informativeness, systematicity, coherence and safety. It was determined that the blog performs a number of functions, which include interpersonal communication, organization of learning, social adaptation, self-expression and creativity. It has been demonstrated that the organizational, personnel, technical, information and legal support of the blog in the field of higher education is gaining importance. It has been established that modern higher education institutions keep blogs both in the classical understanding of this phenomenon and in other forms, often calling a blog a corporate feed of news, which is provided at the level of structural units of the educational institution. To some extent, this indicates a change in these concepts, since the news feed does not support the function of comments, which is a mandatory requirement for a blog. Novelty. A conceptual scheme of the blogging components of higher educational institutions, containing an institutional, functional and effective component, is proposed. The topics of the educational blogs of the leading HEIs in Europe have been determined. Based on the research of practical education of the leading higher education institutions of Europe, it was determined that modern effective tools for the promotion of educational services and academic activity, which complement communication and assimilation of material, are also: storytelling, comics, interactive books, virtual corporate characters (mascots) of an educational brand. Practical value. The results of the study may be useful for Ukrainian HEIs promoting their brand in the market of educational services through blogging.

Современные тенденции экономического развития регионов страны

The article reflects the importance of socio-economic development of regions as a structural unit of the economy of the entire country. The economic activity of seven enlarged macro-regions with the presence of the main departments of the Central Bank of the Russian Federation is analyzed - the Central Federal District (Main Department for the Central Federal District), North-West (NWGU), Siberian (SGU), Southern (SGU), Ural (UGU), Volga-Vyatka (VGU), Far Eastern (DGU), for each of which the main indicators, trends and dependencies are identified. Based on the data obtained, it was found that throughout the country there is varying degrees of investment activity in four types of activity - construction, industry, mining, services. Positive and negative factors of investment activity of entrepreneurs and investors are identified, and the state of the transport and logistics infrastructure of cargo transportation in the country is ranked. Based on the data obtained, recommendations are developed to improve the competitiveness of the territories and achieve technological sovereignty of the country.

Quantitative and Qualitative Relationships between Phospholipid Fatty Acid Analysis Biomarkers and Lignin in Soil from the Tibetan Plateau (China) under Laboratory Incubation Conditions

Lignin, an organic compound with a complex structure, is formed through the polymerization of structural units linked by carbon–carbon bonds and ether bonds. The question of whether lignin is labile or resistant to biological and chemical degradation in soil, particularly in alpine ecosystems, remains unresolved. To address this knowledge gap, we analyzed the relationship between phospholipid fatty acid biomarkers and the abundance of lignin components in grassland soils from North Tibet, China. Soil samples were collected from alpine grasslands, including alpine meadows and alpine steppes. The relative abundance of lignin in these alpine grassland soils before and after a 210-day incubation period was measured. Our results indicate that the relative abundance of lignin in the alpine grassland soils decreased during the incubation period. Significant relationships were found between the phospholipid fatty acid biomarkers of bacteria, fungi, Gram-positive bacteria, and Gram-negative bacteria and the relative abundance of lignin components. This research was conducted under laboratory conditions that are optimal for the development of microorganisms but significantly different from the conditions in Tibet. Furthermore, this study contributes to the understanding of soil organic matter degradation and the dynamics of microbial communities in alpine grassland soils in the context of future global warming.

Structural parameters and molecular model of Shendong subbituminous coal

Coal has a highly complex chemical structure, similar to polymers, coal is a macromolecular structure composed of a large number of “similar compounds”, which is called the basic structural unit. Understanding coal structure is the basis of its transformation and utilization. Shendong (SD) coal was analyzed by FTIR, XRD, XPS, and NMR. The results show that SD coal normalized structure formula is C100H68.5O35.7N1.2S0.2 and the average number of aromatic rings is 1.98. –CH2— content accounts for about 82% in aliphatic C–H region, and the ratio of ether bond C–O, aromatic ether C–O and CO is about 2:1:11 in oxygen-containing functional group region. The d002, LC, La and NC of SD coal microcrystalline structure parameters are 0.1832 nm, 1.4688 nm, 2.0852 nm and 9.017, respectively. Aromatic carbon and aliphatic carbon ratios of SD coal are 55.67% and 29.97%, aromatic cluster size and average methylene chain length are 0.224 and 1.817. Based on these structural parameters, molecular model of SD coal was constructed with 13C SSNMR experimental spectra as a reference. The model was constructed with an atom composition of C214H214O49N2S.

Chameleon Sequences-Structural Effects in Proteins Characterized by Hydrophobicity Disorder.

Repeated protein folding processes both in vivo and in vitro leading to the same structure for a specific amino acid sequence prove that the amino acid sequence determines protein structuring. This is also evidenced by the variability of structuring, dependent on the introduced mutations. An important phenomenon in this regard is the presence of a differentiated secondary structure for chain fragments of identical sequence representing distinct forms of the secondary-order structure. Proteins termed chameleon proteins contain polypeptide chain fragments of identical sequence (length 6-12 aa) showing structural differentiation: helix versus β-structure. In the present paper, it was shown that these fragments represent components matching the structural status dictated by the physicochemical properties of the entire structural unit. This structural matching is related to achieving the goal of the biological function of the structural unit. The corresponding secondary structure represents a means to achieving this goal, not an end in itself. A selected set of proteins from the ChSeq database have been analyzed using a fuzzy oil drop model (FOD-M) identifying the uniqueness of the hydrophobicity distribution taken as a medium for recording the specificity of a given protein and a given chameleon section in particular. It was shown that in the vast majority, the status of chameleon sections turns out to be comparable regardless of the represented secondary structure.

Impact of SnO2 doping on spectroscopic characteristics of the SnO2-Na2O-CoO-B2O3 borate glass matrix

The role of tin oxide (SnO2) on the structure-optical features of borate glasses containing low cobalt oxide impurities was studied. The study was carried out on a glass system [x SnO2 – (80-x) B2O3 – 19.5 Na2O – 0.5 CoO]; x = 0.0, 0.5, 1.0, 2.0 and 3.0 mol%. Glass synthesis was carried out by the melt-quench technique. Structure and optical absorption spectroscopy were carried out to explore the optical transitions of Co cations inside the present glass matrix. The obtained results indicate that, with the further addition of SnO2 content, the molar volume decreased from 31.675 cm3/mol to 29.147 cm3/mol. FTIR studies indicated the basic structural units of trigonal BO3 units and BO4 tetrahedra. Herein also, additional contents of tin oxide increased the nonbridging oxygen contents. The reason behind such increment is attributed to the existence of Sn4+ ions in octahedral coordination acting as network modifiers. Optical absorption spectra indicated the existence of Co ions in both Co2+ and Co3+ oxidation states. Moreover, the existence of significant SnO2 concurred with the significant blue shift in the visible absorption bands and red shift in near infrared absorption bands. The positions absorption bands of Co ions were analyzed in the context of ligand field parameters determinations. The obtained data of the crystal field splitting parameter (10Dqt) showed decreased values from 3451 cm−1 to 3364 cm−1 with more SnO2 addition. While Racah parameter B values were also, attained showing increased values from 967 cm−1 to 985 cm−1 when additional SnO2 is added. Further, the impacted role of SnO2 addition on the structural and optical properties of the present glasses was finally estimated.

Self-Healing fluorinated polymer deep eutectic electrolytes for stable lithium metal batteries

Lithium metal batteries (LMB) have attracted great attention in the last two decades for their high theoretical capacity and ultralow redox potential. However, LMB commercial applications still face safety risks such as electrolyte leakage, short circuits and even spontaneous combustion. Fluorinated polymer electrolytes have the advantages of high thermal stability and wide electrochemical window, endowing them an ideal alternative to liquid electrolytes. This work draws inspiration from the self-healing mechanism by introducing 2-ureido-4-pyrimidinone (UPy) units and successfully demonstrates that the fluorinated polymer deep eutectic electrolytes (FPDE) show high electrochemical performances in LMB. Self-healing structural units can alleviate the volumetric expansion of lithium anode during the charging and discharging process, while the fluorinated group endow the electrolyte wide electrochemical window, high migration number and superior interface stability. The joint effect of deep eutectic electrolytes and fluoroalkane makes FPDE show excellent flame-retardant performance with 0 s self-extinguish time. Symmetric Li||Li cell using the FPDE shows stable performance up to 6000 h. The full cell with Li||FPDE||LFP provides 80.4 % capacity retention after 600 cycles. This work might show some potential for development high safety LMBs.

Novel phosphate bioglasses and bioglass-ceramics for bone regeneration

Bioactive glasses and glass-ceramics are biomaterials characterized by excellent bone bonding abilities. Many different bioactive glass formulations have been studied since the introduction of 45S5 bioglass by Larry Hench. Among silicate and borate bioglasses the phosphate-based ones seem to be interesting in drug delivery systems applications due to their high solubility and low toxicity. In this study novel phosphate bioactive glasses from the composition of P2O5 – CaO – Ca(OH)2 – KF – Na2O – TiO2 and P2O5 – CaO – Ca(OH)2 – ZnO – KF –TiO2 modified with 500 ppm or 2000 ppm of HAuCl4 – 3H2O were obtained by traditional melt-quenching technique. Glass crystallization temperature was measured by DSC calorimetry. The bioglasses were partially crystallized above the crystallization temperature and the bioactive glass-ceramic based on the composition of the parent glasses was obtained. The FT-IR structural studies were performed to detect the presence of structural units beneficial for bioactivity of the materials. Crystalline phases of the bioglass-ceramics were identified with XRD. All bioglass-ceramics contained bioactive β-pyrophosphate. The obtained bioglasses and glass-ceramics were incubated in SBF to evaluate their bioactivity. Only P2O5 – CaO – Ca(OH)2 – KF– Na2O–TiO2 bioglass-ceramics developed apatite-like layer on the surface after incubation in Simulated Body Fluid and was chosen as the material for future studies. The impact of the chemical composition of the bioglass, presence of particular structural units and bioglass-ceramic phase composition on the in vitro bioactivity was discussed.

Regulating structural units and morphology of SiOC anode for enhanced high-rate storage and long-life lithium ion batteries

The widespread use of silicon oxycarbide (SiOC) anodes in industry has been hampered by their limited reversible capacity, subpar rate performance, and complex manufacturing methods. In this research, a novel strategy is proposed to in situ construct SiOC with oxygen-rich structural units and flake morphology via one-pot synthesis, which integratively facilitates the reversible capacity and enhances the transport capability of Li+. Benefiting from these structural and compositional merits, the produced SiOC electrode showcases an impressive reversible capacity of 906 mAh g−1 at 0.1 A g−1, a remarkable rate capability of 591 mAh g−1 and cycling stability of 98 % capacity retention rate at 2.0 A g−1 after 1200 cycles. Characterization results prove that the SiOC with a higher content of oxygen-rich structural units and flakes is helpful in forming the stable solid-electrolyte interface film and buffering volume expansion. Furthermore, it is demonstrated that the SiOC anodes containing LixSiOy compounds reduce the irreversible use of Li-ions during the initial reaction. Our findings present an effective method to simultaneously manipulate the structural units and morphology of SiOC compounds, paving the way for superior electrochemical performance.

Prosecutor’s Supervision over the Implementation of Legislation in the field Development of the Arctic Zone of the Russian Federation

In the article, the author examines the Arctic territories supervised by the prosecutor’s office, where prosecutors supervise the implementation of laws in the development of the Russian Arctic. Highlights the main elements of prosecutorial supervision: subject, objects, subjects and powers of prosecutors. Analyzes the results of the work of regional prosecutors’ offices to supervise the implementation of laws, the supervised territory of which is entirely included in the Arctic zone of the Russian Federation. The author proposes in supervisory activities to take into account the main goals, objectives and priority areas of activity defined by the Fundamentals of State Policy of the Russian Federation in the Arctic for the period until 2035, as well as the Strategy for the Development of the Arctic Zone of the Russian Federation and Ensuring National Security for the period until 2035. In order to improve prosecutorial supervision, the author proposes to create a new structural unit in the Main Directorate for Supervision of the Execution of Federal Legislation of the General Prosecutor’s Office of the Russian Federation — a department for supervision of the implementation of federal legislation in the Arctic regions and two specialized prosecutor’s offices (environmental and transport) with deployment in the Arctic zone of the Russian Federation, as well as the publication of departmental orders of the Prosecutor General of the Russian Federation.

Carbon dot-loaded Fe3O4 as photonic pigments for multilevel anti-counterfeiting

Amorphous arrays assembled from colloidal microspheres are a way that obtains angle-independent structural colors. In order to obtain additional properties, colloidal microspheres, which are constituent units, can be modified with other materials. Here, we utilized the silane-functionalized carbon quantum dots (SiCDs) by incorporating them into the Stöber reaction to fabricate Fe3O4@SiO2/SiCDs nanospheres with a core-shell structure. Amorphous colloidal arrays (ACAs) were constructed on commercial printing paper using Fe3O4@SiO2/SiCDs nanoparticles as structural units by a simple permeation assembly. Macroscopically, the prepared ACAs exhibit the magnetic properties of Fe3O4, while under sunlight, they display bright, angle-independent structural colors. Under ultraviolet light, the array shows significant fluorescence. This enables the presentation of multidimensional information under varying magnetic and lighting conditions. By adjusting the thickness of the outer SiO2/SiCDs composite layer, the optical properties and magnetism can be controlled easily. Moreover, due to the strong light absorption capability and high refractive index of Fe3O4, the digital patterns constructed with Fe3O4@SiO2/SiCDs nanospheres demonstrate excellent multi-level anti-counterfeiting characteristics, even under water exposure. The magnetic properties of Fe3O4@SiO2/SiCDs nanospheres, along with their distinct display characteristics under different optical environments, suggest their wide applicability in the fields of multifunctional anti-counterfeiting pigments, bioimaging, and sensing displays.