bluuebunny/crossref_metadata_2025 huggingface dataset:
Narrative strategies in the stories by Vladimir Nabokov in the 1920s
Authors:   Azbooka-Atticus Publishing Group, Stepanova Alla
Published: January 2024

The author argues that the features of the narrative structure in the stories by Vladimir Nabokov have repeatedly become the subject of researchers’ attention, both literary critics and linguists. Scholars have highlighted some features specific to the modernist narrative in the analyzes of particular Nabokov works and in the scholarly articles devoted to Nabokov in general. One of the most prominent feature is the uncertainty of the “deictic modus of the text” (Mikhail Dymarsky). However, in the early Nabokov works, when his individual style was just being formed, one can find examples of a consistently sustained traditional narrative. The material for this study was Nabokovʼs stories of the 1920s: this period accounts for almost half of the short stories he created; in addition, the instability of the authorʼs preferences when choosing narrative strategies attracts researcher’s attention. The fundamental differences between these strategies, their incompatibility, and their orientation toward solving mutually exclusive problems become more noticeable when comparing early Nabokov prose and the works by Anton Chekhov, a writer whose creative method evolved within the framework of the traditional narrative. So, along with all sorts of ways to violate the usual conditions of communication with the reader, Nabokov also uses the types of narration explored by Alexandre Chudakov on Chekhovʼs material. In other words, in the early stories, Nabokov actively masters the experience of his recent predecessors and looks for ways to overcome traditional narrative forms; in this sense, the arsenal of his artistic devices is more diverse than that of his predecessors. The results of the study allow to formulate a question about the plot conditionality of certain narrative devices in Nabokovʼs stories and, more broadly, in his prose.
“Greece” semantic field in Marina Tsvetaeva’s idiolect
Authors:   Southern Federal University, Izotova Natalia , Tabachenko Liudmila ,   Southern Federal University
Published: January 2024

The presentation of an author’s individual linguistic picture of the world by describing the structure and content of semantic fields is one of the relevant areas of literary texts’ and author idiolects’ analysis in modern linguistics. The article is devoted to the semantic and associative analysis of the lexemes comprising the “Greece” semantic field in Marina Tsvetaeva’s idiolect. The analysis enables to state the correlations between the “Greece” and other key semantic fields and to identify universal and the author’s individual semantic meanings and associations of the lexemes, which form the core and periphery of the semantic field “Greece”. The latter aspect of the analysis has not come into the linguistic research focus yet. The analysis of semantic fields is especially effective in the study of Marina Tsvetaeva’s idiolect, which is characterized by semantic compression, dynamism in the unfolding of meanings and semantic capacity of words. The core of the semantic field under study is the lexeme Greece, the center of the field includes the one-root words Greek, a Greek, the synonym Hellas, as well as its derivatives. The periphery of the field consists of toponyms, names of garments, numerous ancient anthroponyms and theonyms. The lexemes of the semantic field “Greece” also represent other significant semantic fields in Marina Tsvetaeva’s poetic, prose and epistolary texts. They denote the following meanings and associations: ‘culture’, ‘education’, ‘creativity’, ‘love for freedom’, ‘Orthodox faith’, ‘kindness, generosity’. The semantic field “Greece” is mainly associated with people dear to the poetess: her father Ivan Tsvetaev, Maximilian Voloshin, Rainer Maria Rilke. Recreating the spirit and culture of Greece, Tsvetaeva embodied the image of an era close to her, a country native to her in spirit and in which she did not have to be disappointed.
Investigating the vulnerability of the northern coasts of Iran due to changes in the water level of the Caspian Sea by considering the effects of climate change
Authors: Ghassabian Sina , Tayari Omid , Momeni Roghabadi Mehdi , Irandoost Mohsen
Published: January 2024

Coastal aquifers are one of the most important sources of water supply, and it is expected that the effects of climate change will be one of their threatening factors in the short or long term. The present study was conducted in the northern coasts of Iran (Amirabad, Babolsar) and the main goal was to investigate the behavior of saltwater advance in coastal aquifers considering the changes in the coastline due to the effects of climate change and aquifer characteristics. In order to simulate the flow of underground water and the advancement of salt water in the coastal aquifer of the Caspian Sea, MODFLOW MT3DMS and SEAWAT numerical models were used in the GMS10.6 software. The results show that there is a salinity increase of up to 60 ppt, which is much higher than the minimum seawater salinity of 2 ppt. According to the results, it is clear that in the studied area, contaminated water entered the underground aquifers, especially in the coastal erosion areas and during the seasons when the sea level changes and when the changes in the coastline increase.
Modeling and optimization of engineering parameters for the treatment of textile wastewater using modified clay/TiO2/ZnO
Authors: Jamil Tayyaba
Published: January 2024

The objective of this project was to develop a new hybrid nanocomposite that would maximize chemical oxygen demand (COD) and color removal from effluent from the actual textile industry to overcome the water crisis brought on by increasing industrialization and urbanization. This study is the first to use modified clay/TiO2/ZnO nanocomposites for adsorbing actual textile wastewater treatment. The adsorption capacity from the dye removal was evaluated to optimize the three engineering parameters (pH, adsorbent dose, and time) utilizing response surface methodology. An isotherm kinetic intra-particle diffusion model was developed to study the sorption phenomena. The best fit for sorption was provided by Langmuir isotherms, with an R2 of better than 0.99. The sorption process follows the pseudo-second-order kinetics that favors chemisorption, following kinetic theory. The sorption process is endothermic, viable, and spontaneous in nature, according to a thermodynamic study. At the optimal pH (5.5), adsorbent dose (0.55 g), and time (75 min), the maximum COD and color removal were achieved to be 94 and 91% with a maximum sorption capacity of 660 mg/g. In this optimization, the adj. R2 and R2 correlation coefficients were calculated as 0.7213 and 0.7653, respectively. The hybrid composite seems to be effective for treating real effluents.
We Need Them. They Will Do Much Better Without Us. A Review of Survival at Stake, by Poorva Joshipura
Authors: Venkatesh G
Published: January 2024

The SEeB Editorial Team does not provide abstracts for book reviews.
The Impact of miR-122 on Cancer
Authors: Wu Shijie , Wu Yiwen , Deng Sijun , Lei Xiaoyong , Yang Xiaoyan
Published: January 2024

MiRNAs are confirmed to be a kind of short and eminently conserved noncoding
RNAs, which regulate gene expression at the post-transcriptional level via binding to the 3'-
untranslated region (3’-UTR) of targeting multiple target messenger RNAs. Recently, growing
evidence stresses the point that they play a crucial role in a variety of pathological processes,
including human cancers. Dysregulated miRNAs act as oncogenes or tumor suppressor genes in
many cancer types. Among them, we noticed that miR-122 has been widely reported to significantly
influence carcinogenicity in a variety of tumors by regulating target genes and signaling
pathways. Here, we focused on the expression of miR-122 in regulatory mechanisms and tumor
biological processes. We also discussed the effects of miR-122 dysregulation in various types of
human malignancies and the potential to develop new molecular miR-122-targeted therapies.
The present review suggests that miR-122 may be a potentially useful cancer diagnosis and
treatment biomarker. More clinical diagnoses need to be further launched in the future. A promising
direction to improve the outcomes for cancer patients will likely combine miR-122 with
other traditional tumor biomarkers.
Enhanced Sampling in Molecular Dynamics Simulations: How Many MD
Snapshots can be Needed to Reproduce the Biological Behavior?
Authors: Tavares Camila A. , Santos Taináh M.R. , Gonçalves Mateus A. , da Cunha Elaine F.F. , Ramalho Teodorico C.
Published: January 2024

Since its early days in the 19th century, medicinal chemistry has concentrated its efforts
on the treatment of diseases, using tools from areas such as chemistry, pharmacology, and molecular
biology. The understanding of biological mechanisms and signaling pathways is crucial information
for the development of potential agents for the treatment of diseases mainly because they are such
complex processes. Given the limitations that the experimental approach presents, computational
chemistry is a valuable alternative for the study of these systems and their behavior. Thus, classical
molecular dynamics, based on Newton's laws, is considered a technique of great accuracy, when
appropriated force fields are used, and provides satisfactory contributions to the scientific community.
However, as many configurations are generated in a large MD simulation, methods such as Statistical
Inefficiency and Optimal Wavelet Signal Compression Algorithm are great tools that can
reduce the number of subsequent QM calculations. Accordingly, this review aims to briefly discuss
the importance and relevance of medicinal chemistry allied to computational chemistry as well as to
present a case study where, through a molecular dynamics simulation of AMPK protein (50 ns) and
explicit solvent (TIP3P model), a minimum number of snapshots necessary to describe the oscillation
profile of the protein behavior was proposed. For this purpose, the RMSD calculation, together
with the sophisticated OWSCA method was used to propose the minimum number of snapshots.
Ovothiol-A Mitigates High-Fat Diet-Induced Non-alcoholic Fatty Liver
Disease in Rats
Authors: Arafa Nada Hussien , Shehata Mohamed Refaat , Mohamed Ayman Saber
Published: January 2024

Background:

Obesity is frequently linked to multiple comorbid and chronic illnesses,
including non-alcoholic fatty liver disease, type 2 diabetes, cancer, and heart disease. Ovothiol-A
is one of the most powerful natural antioxidants found in marine invertebrates like sea urchins.

Objective:

The current study aimed to investigate ovothiol-A's hypolipidemic and hypoglycemic
potential in obese rats.

Methods:

All groups get a high-fat diet (HFD) for four weeks except for the control group. The
control and HFD groups received distilled water, while the Ovothiol-A groups received two doses
of Ovothiol-A (200 and 400 mg/kg orally) concurrent with HFD.

Results:

Weight gain, glucose, insulin, alanine aminotransferase, aspartate aminotransferase,
gamma-glutamyl transferase, alkaline phosphatase, total cholesterol, triglycerides, low-density
lipoprotein, malondialdehyde, and nitric oxide were all decreased after oral administration of Ovo
at either the 200 or 400 mg/kg dose, while levels of high-density lipoprotein (HDL), glutathionereduced, catalase and glutathione-S-transferase increased. Histopathological alterations were less
noticeable in the liver tissue of Ovothiol-A groups, with only a few vacuolated or pyknotic nuclei
amongst a few dispersed hepatocytes.

Conclusion:

The current findings indicate that ovothiol-A protects against high-fat diet-induced
fatty liver in rats. The anti-obesity mechanism of Ovothiol-A is associated with its hypolipidemic,
hypoglycemic, and antioxidant properties.
Formulation and Evaluation of Glipizide-loaded Mucoadhesive Microparticle
Using Salvia hispanica Seeds Mucilage as Co-polymer
Authors: Ojha Smriti , Tripathi Stuti , Tripathi Shivendra  Mani , Mishra Sudhanshu
Published: January 2024

Aims:

Chia seed (Salvia hispanica L.) gum is a mucoadhesive, biodegradable polymer
with sustained release properties.

Objective:

The objective of this study was to compare different formulations of glipizide-loaded
microparticles using chia seed mucilage and sodium alginate, focusing on sustained release and
mucoadhesive properties.

Background:

The present study aimed to comparatively evaluate various eco-friendly
formulations of glipizide-loaded microparticles prepared using chia seed mucilage and sodium
alginate.

Materials and Methods:

Gum was extracted from chia seeds and lyophilized, and preformulation studies were performed according to established protocols. Microparticles were
formulated using the ionic gelation method, with sodium alginate as a copolymer and zinc
chloride as a cross-linking agent. The prepared microparticles were evaluated using scanning
electron microscopy (SEM) for size and particle aggregation, and Fourier Transform infrared
spectroscopy (FTIR) for drug-polymer interaction, entrapment efficiency, swelling index, and in
vitro drug release.

Results:

The % yield of chia seed mucilage was 27.35%. The pH of the mucilaginous suspension
was 4.67 ± 0.50. The moisture content value was 14.56 % ± 0.50. The values of Carr's index and
Hausner's ratio were 22.58 ± 1.89 and 1.38 ± 0.05, respectively. FTIR spectra showed no
interaction between pure glipizide and chia seed mucilage, confirming no possible change in
glipizide's pharmacology. SEM studies have confirmed the shape of the microparticles to be
spherical, with average sizes ranging from 1235.18 ± 8.7 to 1423.25 ± 9.5 µm, and the drug
entrapment efficiency ranged from 64.25 ± 2.52 to 81.82 ± 7.56%. The release of glipizide from
the microparticles was sustained, and the Higuchi and Korsmeyer-Peppas models were found to
be the best-fit kinetic models.

Conclusion:

The promising copolymer blend of chia seed mucilage and sodium alginate was
used for the development of sustained-release dosage forms. A copolymer blend with a ratio of
1:1 produced glipizide-loaded microparticles with sustained release profiles and good
mucoadhesive ability, along with a high percentage of drug entrapment efficiency.
Sulbactam-Durlobactam, A Novel Drug for the Treatment of Multidrug
Resistant Acinetobacter baumannii Infections - A Systematic Review
Authors: Velmurugan Hemasri , Venkatesan Sajitha , Meles Hadush Negash , Neelambaram Krishnapriya , Thangaraju Pugazhenthan
Published: January 2024

Background:

Sulbactam-durlobactam (SUL-DUR) has been tested in vitro for its ability to gen-
erate resistance in clinical isolates of Acinetobacter species. According to prior studies, combining durlobac-
tam with sulbactam causes sulbactam-resistant isolates to become more active and revert to susceptibility.
We aimed to conduct a systematic review of the in vitro activity of SUL-DUR on A. baumannii (Ab) iso-
lates, including carbapenem-resistant A. baumannii (CRAb), to provide an overview for physicians dealing
with Ab infections.

Methods:

The following keywords were searched in the PubMed, Google Scholar, and EMBASE databases
to look for eligible original works that have been published without restrictions till June 30, 2023: A. bau-
mannii and sulbactam-durlobactam, SUL-DUR, durlobactam, and sulbactam-ETX2514. We also searched
clinicaltrials.gov and the Clinical Trials Registry of India (CTRI) for clinical trials involving sulbactam-
durlobactam and Acinetobacter

Results:

There were a total of 852 abstracts found. Among them, 633 articles with titles, abstracts, and key-
words were reviewed, and 574 articles were removed after the initial screening. A total of 59 full-text eligi-
ble articles were evaluated, and 51 of them were eliminated because they did not satisfy the criteria set for
inclusion. The full texts of the final 8 in vitro studies on A. baumanii and sulbactam/durlobactam were fur-
ther evaluated. There were 5 trials on A. baumanii and sulbactam/durlobactam found on clinicaltrials.gov
and the Clinical Trial Registry of India (CTRI).

Conclusion:

The findings from the studies show that SUL-DUR might be a successful therapeutic option for
multidrug-resistant-Ab infections. Future clinical trials will be required to validate the possibility of using
this combination to treat multidrug-resistant A. baumannii infections.
Exosome and Other Extracellular Vesicles in Gene Therapy and
Personalized Care
Authors: Minocha Neha , Sardana Satish
Published: January 2024

Exosomes and other extracellular vesicles (EVs) have emerged as versatile
agents facilitating cell-to-cell communication, assuming pivotal roles in both physiological and pathological contexts. This manuscript presents an extensive overview of the existing knowledge concerning the utilization of exosomes and EVs in gene therapy and
personalized healthcare. It delves into their inherent capacity for transferring genetic material, their limited immunogenicity, and their potential for precise and targeted delivery.
Furthermore, the paper investigates the ever-evolving domain of biomarker discovery,
where exosomes and EVs hold substantial promise for the early detection of diseases and
the monitoring of treatment responses. As ongoing research advances, the manuscript explores the potential for refining protocols related to standardization and quality control,
along with the optimization of scalable manufacturing methods. Additionally, the manuscript sheds light on the burgeoning potential for individualized treatments driven by genomic profiling. By examining these facets, we foresee that exosomes and EVs will play
a pioneering role in ushering in a new era of precision medicine, offering safer, more efficacious, and highly customized therapeutic interventions across a spectrum of medical
conditions.
Inherent Insights using Systematic Analytics of Developments Tools in Ethereum Blockchain Smart Contract
Authors: Jyoti Amrita , Gupta Pradeep , Gupta Sonam , Khatter Harsh , Mishra Anurag
Published: January 2024

Ethereum is an open-source, public, blockchain-based distributed computing platform
and operating system that allows the development and execution of distributed applications without
the risk of downtime, fraud, control, or intervention from a third party. Along with serving as
a platform, Ethereum also offers a Turing-complete Blockchain programming language that aids
in the publication of distributed applications. One of the major Ethereum projects is Microsoft's
collaboration with Consensus, which provides Ethereum Blockchain as a Service (EBaaS) on Microsoft
Azure to give enterprise clients and developers access to a cloud-based blockchain development
environment with a single click. Only the implementation determines the size of the
Ethereum blockchain. Geth's Ethereum blockchain is around 11 GB in size, compared to Parity's 6
GB. Although the total size of the Ethereum blockchain, in its entirety, may reach 60GB+. Even
though the toolset you require may vary depending on the specific blockchain, the majority of
tools are compatible with Ethereum, therefore here we highlighted the various enhancement tools
that we use for implementing blockchain applications on the Ethereum platform.
Therapeutic Potential and Clinical Effectiveness of Quercetin: A Dietary
Supplement
Authors: Devi Vishakha , Deswal Geeta , Dass Rameshwar , Chopra Bhawna , Kriplani Priyanka , Grewal Ajmer Singh , Guarve Kumar , Dhingra Ashwani K.
Published: January 2024

Fruits and vegetables (like apples, citrus, grapes, onions, parsley, etc.) are the
primary dietary sources of quercetin. In addition, isolated quercetin is also available on the
market as a dietary supplement with a daily dose of up to 1000 mg/d. The objective of the
present study is to explore the therapeutic potential and clinical efficacy of quercetin as a dietary
supplement. The present paper highlights the safety parameters and clinical trial studies
with several targets reviewed from the data available on PubMed, Science Direct, ClinicalTrails.
gov, and from many reputed foundations. The results of the studies prove the
unique position of quercetin in the treatment of various disorders and the possibility of using
phytochemicals such as quercetin for an efficient cure. As evidenced by the numerous published
reports on human interventions, it has been concluded that quercetin intake significantly
improves disease conditions with minimal adverse effects.
Application of The Elaboration Likelihood Models in The Political Campaign of Sudrajat-Syaikhu During The West Java Regional General Election in 2018
Authors: Pontoh Andhika Kurniawan , Soeharno Farrah Mardiati , Risjad Mutia Adia
Published: January 2024

The Regional Election (PILKADA) of West Java in 2018 has seen significant change in the increasing electability of one of the governor and vice governor candidates Sudrajat-Ahmad Syaikhu ahead of the election day. Amid the estimation commissioned by various survey institutions, the final results of the vote count showed a significant jump in the vote collection of Sudrajat-Syaikhu. These significant jumps can be achieved because the candidate utilized campaign persuasion messages by emphasizing religious values, supporting for certain groups social and political causes and was benefited by the existing authorities both from the government and the party. Government programs that should be prioritized, were promoted on the shades of significant phenomenal issues to get votersâ€™ attention. This article tries to explain the application of the Elaboration Likelihood Model to the Sudrajat-Syaikhu's campaign that succeeded in changing voter behavior in West Java. The Elaboration Likelihood Model asserts two main channels for conveying persuasion messages, the central route and the peripheral route. In the Elaboration Likelihood Model theory, persuasive messages will be received differently by the recipient. This is because recipients have differences in motivation and ability to comprehend the conveyed messages. Central persuasion messages can be seen in the form of messages containing strong logical and directed information, whereas peripheral persuasion messages comprise short-cut elements related to authority, commitment to the group, reciprocal relationships, scarcity and social proof. This paper will describe the application of the Elaboration Likelihood Model theory in the Sudrajat-Syaikhu campaign strategy which utilized and was benefited from the peripheral route using Islamic populist strategies, support for #2019GantiPresiden cause and 212 movement, and authorities from party, military and the ruling government. The utilization of this peripheral route is proven able to increase the number of votes in the end, which reflects the reality of prioritization of religious values above other aspects in West Java.Key words: Elaboration Likelihood Model, Voters Motivation, Pilgub Jabar 2018, Sudrajat-Syaikhu
Aferrarse al mundo - Historias de lectoras, lectores y sus bibliotecas
Authors:   Universidad de Antioquia, Colombia, Marín Colorado Paula Andrea , Valencia Margarita ,   Instituto Caro y Cuervo, Colombia, Agudelo Ochoa Ana María ,   Universidad de Antioquia, Colombia, Guzmán Méndez Diana Paola ,   Universidad de Antioquia, Colombia, Robledo Corredor Ana Katherine , Castaño Gómez Leidy Dayana
Published: January 2024

Los estudios sobre la relación entre los lectores, sus libros y sus lecturas se concentran por lo general en el pasado remoto o en aquellos lectores sobresalientes en su medio intelectual. Por ello, este texto emprende una exploración sobre lectoras y lectores habituales del presente y la relación con sus bibliotecas personales, con sus libros y con la lectura. A través de este ejercicio, las autoras buscan comprender prácticas lectoras y su relación con los libros como objetos materiales y culturales, al mismo tiempo que construyen archivos que testimonien las trayectorias de algunos lectores habituales del presente en Bogotá y en Medellín. Este libro es un testimonio de lectoras y lectores: de cómo llegaron a la práctica lectora, de cómo ha sido su relación con la lectura y con el libro como objeto, y de cómo la lectura ha transformado sus vidas. Más importante, es el testimonio de cómo los libros han sido, para ellas y ellos, el ancla para aferrarse al mundo.
Organization of response to information security incidents
Authors: Trofimov D. O. , Shepelev M. S. , Reznichenko S. A.
Published: January 2024

Objective. Development of practical recommendations for creating an effective information security incident response system. Method. The article includes an analysis of existing methods and tools for detecting and analyzing information security incidents, as well as a study of the consequences of such incidents and their impact on the work of a company or organization. Result. Development of a set of practical recommendations aimed at creating an effective information security incident response system. During the analysis of existing methods and tools for the detection and analysis of information security incidents, the most effective and adapted approaches were identified. These methods include both technical means of detection and rapid incident response processes. The recommendations were created taking into account the characteristics of companies and organizations of various industries and are also intended for use by persons who do not have deep knowledge in the field of information security. The recommendations include clear step-by-step instructions, resources and tips that will allow companies to easily implement the proposed measures in their practice. Conclusion. The development of an effective information security incident response system is critically important for companies and organizations, as they face an increasing number of cyber-attacks and threats to information security. Creating an effective information security incident response system is an integral part of a successful business strategy. The developed practical recommendations have the potential to significantly reduce the risks and damage associated with information security, even for companies and organizations without prior experience in this field. These recommendations focus not only on technical aspects, but also on organizational measures to ensure timely detection, analysis and response to incidents.
CFD analysis of air flows and temperatures based on radiant heating in industrial environments
Authors: Aralov E. S. , Kumitsky B. M.
Published: January 2024

Objective. The study aims to investigate the complex interaction between radiant heating and airflow in industrial environments.The aim is to understand the dynamics of temperature, with particular attention to optimizing energy efficiency and comfort in industrial premises heated by a dual-zone dark gas radiant heater. Method. Using Computational Fluid Dynamics (CFD) and Ansis simulation software, the study developed a model that represents typical industrial conditions. This method included the determination and verification of temperature gradients and air velocity parameters, as well as careful mapping of the complexities of the industrial heating process. Result. The analysis provides detailed graphical representations of temperature and air velocity at individual points, revealing the effect of radiant heating on airflow patterns. Particular attention has been paid to how the temperature profiles interact with a dual-zone heating system, revealing important data that helps understand thermal dynamics in industrial environments. Conclusion. The findings demonstrate the potential for significant progress in energy savings and improved worker comfort in industrial environments using radiant heating. The integrated research approach fills a critical gap in existing research, highlighting the need and potential for further exploration of sustainable heating technologies in challenging industrial environments.
Calculation of a heat exchanger using heat pipes in the exhaust air heat recovery system
Authors: Zaitsev A. S. , Shamarov M. V. , Zhlobo R. A. , Ivchenko E. O.
Published: January 2024

Objective. The purpose of the work is to develop practical recommendations for the design and manufacture of a heat exchanger using heat pipes, which could find widespread use in heating, ventilation and air conditioning systems at facilities for various purposes. Method. The research is based on methods of thermodynamic analysis, full-scale and computational modeling of processes and objects of refrigeration and cryogenic technology, air conditioning and life support systems. Result. The implementation of the practical recommendations studied in the work on the use and design of heat exchangers using heat pipes in ventilation, heating and air conditioning systems will provide significant savings in energy spent on heating and/or cooling the air supplied to the room served by the HVAC system. To reduce heat loss in a building, it is rational to maintain air balance and compensate for the exhaust air with an organized influx of outside air, to heat which the heat of the removed exhaust air is utilized. Conclusion. Compared to a heat exchanger based on a glycol recuperator, a regenerator using heat pipes is less energy-intensive, requires virtually no maintenance, and is also more energy efficient due to the absence of a pumping device that requires electricity in the design. At the same time, the ability to completely separate the supply and exhaust ventilation flows of the regenerator on heat pipes is preserved, which is extremely in demand in medical institutions, due to the need to comply with strict sanitary standards.
Modern concrete composites for earthquake-resistant construction
Authors: Murtazaev S.-A. Yu. , Sheina S. G. , Saidumov M. S. , Murtazaev I. S.-A.
Published: January 2024

Objective. The purpose of the research is to develop earthquake-resistant building composites Method. The study is based on experimental dynamic testing of fine-grained concrete. Existing approaches to ensuring seismic safety of buildings and structures are analytically summarized. Result. Domestic and foreign experience in designing fine-grained concrete compositions for earthquake-resistant construction is presented. Compositions of fine-grained concrete of various classes were obtained using raw materials of natural and man-made origin. Recipes were proposed and their construction, technical and dynamic properties were studied. Conclusion. The strength of fine-grained concrete increases with decreasing loading time, and at a loading time of approximately 0.01 sec or a loading rate of about 5000-7000 MPa sec, this excess is about 30% compared to the statistical strength of concrete. This allows us to recommend fine-grained concrete for structures experiencing dynamic impact.
On the Natyre of the Influence of the Architecture of Molecules on the Thermophisical Properties of Alkane Isomers
Authors: Neruchev Yu. A. , Zhakin A. I. , Radchenko A. K. , Shkurina V. A.
Published: January 2024

Purpose. Performing measurements of sound velocity and density in the liquid phase of hexane isomers on the saturation line in a wide range of state parameters, including the critical region.

Methods. Using a precision pulse-phase method for measuring the speed of sound in the liquid phase of hexane isomers and their density with a pycnometer at atmospheric pressure. The paper discusses the results of precision measurements of sound velocity and density in five hexane isomers. The speed of sound was measured on the equilibrium curve in the liquid phase of isomers by the pulse-phase method in the range from -30 to their critical point. The measurement error of the speed of sound did not exceed 1 m/s. Density measurements were performed using a pycnometer at atmospheric pressure in the range from -30 to their normal boiling point with an error not exceeding 0.05%. The results of sound velocity and density measurements were used to study the character of intermolecular forces. The necessity of taking into account the non-covalent chemical interaction of molecules of the studied substances is shown.

Results. Sound velocity measurements were performed on the saturation line in the liquid phase of all five hexane isomers in the temperature range from -30 C to the critical temperature of all 5 isomers. The obtained results are used to study the features of the dependence of the energy of intermolecular forces on the parameters of the state in the field of research.

Conclusion. It is shown that the energy of intermolecular forces in marginal hydrocarbons and other simple substances is the sum of 3 terms representing: 1) the energy of the dispersive attractive forces proportional to the square of the density; 2) the energy of the repulsive forces proportional to the biquadrate of the density and 3) the energy of weak chemical non-covalent binding forces proportional to the cubic root of the density of matter.
Physical and Chemical Activation of Quartz Raw Materials with Sodium Hydroxide in the Ratio of the Eutectic Composition in the Na2O – SiO2 System
Authors: Lavrov R. V. , Kuvardin N. V. , Narmatov S.
Published: January 2024

The purpose of this work was to continue research on the activation of quartz raw materials using alkali metal hydroxides. This paper presents a theoretical justification and practical confirmation of the physical and chemical activation of quartz raw materials by sodium hydroxide, taking into account the eutectic ratios in the Na2O–SiO2 system.

Methods. Quartz glass sand VS-030-B was chosen as a source of quartz raw materials; as a sodium-containing raw material flake sodium hydroxide brand TR. For the scientific basis, the phase diagram of Na2O-SiO2 of Berezhny was used. To study the phase composition of activated quartz sand, X-ray phase analysis was used; to study a particle of the activation product of quartz sand and sodium hydroxide, scanning electron microscopy was used. To confirm the effectiveness of the developed method, comparative pulping of sodium vitreous silicate was carried out according to the proposed method and previously known ones.

Results. A method has been developed for activating quartz raw materials with sodium hydroxide to obtain vitreous sodium silicates using a mixture of two activation products, to obtain one of which parts of quartz raw materials and sodium hydroxide are taken in an eutectic ratio, and to obtain another activation product, the remainder of quartz raw materials and the calculated minimum the amount of sodium hydroxide required to obtain a shell on a quartz grain.

Conclusion. Based on the results of comparative experimental cooking of tableted mixtures for silicate lumps using the developed method for activating quartz raw materials and using a mixture of quartz sand and sodium carbonate, the efficiency of the developed method, expressed in reducing the cooking temperature, is experimentally affected. The results of the study were issued in the form of a patent of the Russian Federation No. 2714415 "Method of preparing a charge for alkaline silicate glass".
Gas Chromatographic Determination of Residual Concentrations of a Mixture of Organochlorine Pesticides in Food Products
Authors: Melikhova E. V. , Solovyova V. Yu.
Published: January 2024

Purpose of research.The aim of the work is to optimize the conditions for gas chromatographic determination of a mixture of eight organochlorine pesticides: aldrin, hexachlorobenzene, heptachlor, α-hexachlorocyclohexane, γ-hexachlorocyclohexane, dichlorodiphenyltrichloromethylmethane, dichlorodiphenyldichloroethane and dichlorodiphenyldichloroethylene.

Methods.For chromatographic studies of organochlorine pesticides we used a Shimadzu GC-2010Plus gas chromatograph (Shimadzu, Japan) equipped with an automatic equilibrium vapor sample dispenser NT200N, electron-capture detector based on 63Ni and quartz capillary nonpolar column "Chromatek" SPB-5 (30 m, 0.32 mm, film thickness on the basis of phenyl(5%) and dimethyl(95%) polysiloxanes 0.5 μm) with an operating temperature range of 60°C 320/340°C. The chromatograms were processed in the application LabSolutions GPC.

Results.On the basis of experimentally obtained data the optimal conditions for gas chromatographic determination and separation of eight-component mixture of organochlorine pesticides were selected, namely: the value of mobile phase flow division 1:10, carrier gas flow rate – 1.0 ml/min, two-stage temperature programmable column mode from 160 to 240°C with the rate of increase of 5°C/min. The metrological characteristics of the analysis and validation of the results of the proposed technique with the method of high-performance liquid chromatography were evaluated. Good reproducibility of chromatography results with the possibility of detection of organochlorine pesticides at the level of 10-6 – 10-5 μg/cm3 was proved. Application of Fisher's test has shown absence of significant differences in reproducibility of sampled populations the investigated methods of chromatographic analysis of COPCs are equally accurate. Extraction sample preparation of samples of real objects was proposed, the calculated extraction degrees >84% allow to recommend the technique for quantitative determination of analytes.

Conclusion.The method of gas chromatographic analysis was tested for determination of organochlorine pesticides in samples of drinking water and baby puree (Russia) by additive method. Exceeding the norms of residual contents of organochlorine pesticides in the samples of the food products under study was not detected.
X-ray Fluorescence Analysis of the Elemental Composition of Tungsten, Nickel and Copper
Authors: Ageevа E. V. , Loktionova O. G. , Ulitin D. A.
Published: January 2024

The purpose of this work was to conduct an X-ray fluorescence analysis of the elemental composition of tungsten, nickel and copper metal waste using an Olympus Delta portable spectrometer.

Methods. To determine the chemical composition of raw materials, samples of metal waste in the form of copper rods, tungsten rods of various diameters and scraps of nickel plates intended for recycling were examined. To determine the elemental composition of metal waste, the method of X-ray fluorescence analysis (XFA) was chosen. The X-ray fluorescence method is based on the ratio of the intensity of X-ray fluorescence to the concentration of elements in the sample. Samples irradiated with powerful X-ray tube radiation, in response, emit characteristic fluorescent radiation of atoms proportional to their concentration in the sample. This method allows us to qualitatively assess the elemental composition of complex samples without violating their physico-chemical properties with minimal time costs. The Olympus Delta spectrometer was used as an express analyzer of metals and alloys, with the help of which experimental data on the composition of metal waste of tungsten, nickel and copper were obtained.

Results. Based on the conducted studies aimed at X-ray fluorescence analysis of the elemental composition of tungsten, nickel and copper metal waste using the Olympus Delta portable spectrometer, it was found that the samples of the studied metal waste correspond to the following grades of alloys: tungsten rod made of tungsten grade VA; nickel plate made of nickel grade PNK-0T1; copper rod made of copper grade M3r.

Conclusion. The results obtained will allow further research on their processing by the method of electroerosive dispersion and reuse in the production of heavy tungsten alloys. Renovation of metal waste, including tungsten, nickel and copper metal waste, will contribute to resource conservation, import substitution and ensuring the technological sovereignty of the Russian Federation.
Determination of Mass and Quantitative Productivity of the Process of Electrodispersion of Nickel Waste in Isopropyl Alcohol
Authors: Horiakova N. N. , Ageeva E. V. , Sadova K. V. , Agarkov N. S.
Published: January 2024

The purpose of this study was to obtain electroerosive dispersed nickel by processing nickel waste by electrodispersing in isopropyl alcohol, as well as to study the performance of this process and the particle size of the obtained dispersed nickel.

Methods. Nickel waste in the form of plates was processed into powder by electrodispersion at an experimental electroerosive dispersion plant (RF Patent No. 2449859) in an isopropyl alcohol medium. The study of the average particle size of the obtained electroerosive dispersed nickel was carried out using a laser particle size analyzer "Analysette 22 NanoTec".

Results. For the first time, spherical nickel powders in the medium of isopropyl alcohol were obtained from industrial waste by the method of electroerosive dispersion. The parameters of the electroerosive dispersion unit necessary for the dispersion of nickel waste have been determined. A directly proportional dependence of the mass productivity of the process of electroerosion research of nickel waste dispersion on the voltage at the electrodes in isopropyl alcohol in the range of 120-220 V. has been experimentally established. The optimum for dispersing nickel waste in isopropyl alcohol is the voltage at the electrodes in the range of 200-220 V. It is established that the smallest particle size is nickel powder obtained at a voltage of 220 V at the electrodes, while the mass productivity at this value of the voltage at the electrodes is the maximum.

Conclusion. Based on the presented experimental studies of the mass and quantitative productivity of the process of electroerosive dispersion of nickel waste in isopropyl alcohol, a high efficiency of the use of electrodispersion technology for obtaining dispersed nickel powder, which is not inferior to industrially used powders in terms of average particle size, has been established. It has been experimentally established that the smallest particle size has a nickel powder obtained at a voltage of 220 V on the electrodes, while the mass productivity at this value of the voltage on the electrodes is maximum.
Contribution of the Magnetic Subsystem to the Generation of Longitudinal Acoustic Waves during Domain Wall Motion in Yttrium Orthoferrite
Authors: Zhukov E. A. , Zhukova V. I. , Kuzmenko A. P.
Published: January 2024

Purpose. Modern technologies in their development are increasingly in need of increasing the speed of processing and recording information. An alternative to semiconductor methods is magnetic memory based on changing magnetic moments. The speed of magnetization reversal is determined by the speed of motion of domain walls. The speed is maximum in weak ferromagnets. The purpose of this work is to study the effect of a magnetic wave generated by a moving domain wall on a longitudinal acoustic wave, taking into account the absorption of a magnetic wave in yttrium orthoferrite.

Methods. The equation describing the effect of a magnetic wave generated by a moving domain wall on a longitudinal acoustic wave is solved using the following methods: the slowly varying amplitude method, the perturbation theory method, and the Lagrange method.

Results. For an orthoferrite crystal, the contribution of the magnetic wave accompanying the motion of the domain wall in yttrium orthoferrite to the deformation of the amplitude of the longitudinal acoustic wave is calculated. This contribution in a bounded crystal, without taking into account the absorption of magnetic waves in the absence of the influence of acoustic waves on them, is of the order of 10-6 cm. In an unbounded crystal, the corresponding contribution, taking into account the absorption of magnetic waves, into the generation of longitudinal acoustic waves is of the order of magnitude 10-10 cm with a theoretical thickness of the domain wall D3 ≈ 10-6 cm.

Conclusion. To study the mechanisms of the influence of a magnetic wave generated by a moving DW on a longitudinal acoustic wave, yttrium orthoferrite was taken. Since a weak ferromagnet is characterized by a significant increase in the magnetoelastic coupling when it overcomes the sound barrier. It is this circumstance that made it possible to experimentally observe the generation of elastic displacements by a moving domain wall. To develop devices for recording and processing information based on weak ferromagnets, it is necessary to fully investigate the mechanisms that affect the dynamics of a domain wall during its motion. Such a factor is the interaction of magnetic and acoustic waves with the domain wall, which can affect the quality of information processing. The evaluation of the contributions of these mechanisms can be used to develop the element base of devices for recording and processing information based on the magnetic memory of weak ferromagnets.
The Disintegration of Magnetic Fluid Layer on Liquid and Solid Substrates in Vertical Magnetic Field
Authors: Khokhryakova G. A.
Published: January 2024

The purpose of this work is to experimentally study the process of decomposition of a horizontal layer of a magnetic fluid lying on a liquid non-wettable substrate into an ordered system of drops under the influence of a vertical magnetic field.

Methods. In the experiment, the studied liquids in the form of a two-layer system filling a cylindrical glass cuvette were placed on a horizontal platform in the center of the Helmholtz coils connected to a direct current source. The development of magnetic fluid layer free surface instability was monitored using a high-speed digital video camera installed at the top of the coil system.

Results. The dependence of the critical strength of the magnetic field on the thickness of the torn layer and the magnetic susceptibility of the magnetic fluid is determined. The obtained experimental data are compared with the results of existing theoretical studies of the instability of the magnetic fluid layer. Compared to the case of a solid substrate, the rupture of the magnetic fluid layer on a liquid substrate occurred at lower values of the critical field strength. In this case, the development of instability of the free surface magnetic fluid layer on a solid substrate occurs at field strengths twice as high as the instability strength of the interface of the layer on a liquid substrate.

Conclusion. The use of a liquid substrate makes it possible to break such layers of the magnetic fluid, the deformation of which on a solid substrate is limited only by a periodic perturbation of the surface. The magnitude of the critical strength leading to the disintegration of a continuous magnetic fluid layer on a liquid substrate increases with increasing thickness of this layer. An increase in the magnetic susceptibility of the magnetic fluid leads to a decrease in the critical field strength.