bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimal path planning of a disinfection mobile robot against COVID-19 in a ROS-based research platform
Authors: Banjanovic-Mehmedovic L. , Karabegovic I. , Jahic J. , Omercic M.
Published: December 2021

Due to COVID-19 pandemic, there is an increasing demand for mobile robots to substitute human in disinfection tasks. New generations of disinfection robots could be developed to navigate in high-risk, high-touch areas. Public spaces, such as airports, schools, malls, hospitals, workplaces and factories could benefit from robotic disinfection in terms of task accuracy, cost, and execution time. The aim of this work is to integrate and analyse the performance of Particle Swarm Optimization (PSO) algorithm, as global path planner, coupled with Dynamic Window Approach (DWA) for reactive collision avoidance using a ROS-based software prototyping tool. This paper introduces our solution – a SLAM (Simultaneous Localization and Mapping) and optimal path planning-based approach for performing autonomous indoor disinfection work. This ROS-based solution could be easily transferred to different hardware platforms to substitute human to conduct disinfection work in different real contaminated environments.
A multi-criteria decision-making in turning process using the MAIRCA, EAMR, MARCOS and TOPSIS methods: A comparative study
Authors: Trung D.D. , Thinh H.X.
Published: December 2021

Multi-criteria decision-making is important and it affects the efficiency of a mechanical processing process as well as an operation in general. It is understood as determining the best alternative among many alternatives. In this study, the results of a multi-criteria decision-making study are presented. In which, sixteen experiments on turning process were carried out. The input parameters of the experiments are the cutting speed, the feed speed, and the depth of cut. After conducting the experiments, the surface roughness and the material removal rate (MRR) were determined. To determine which experiment guarantees the minimum surface roughness and maximum MRR simultaneously, four multi-criteria decision-making methods including the MAIRCA, the EAMR, the MARCOS, and the TOPSIS were used. Two methods the Entropy and the MEREC were used to determine the weights for the criteria. The combination of four multi-criteria making decision methods with two determination methods of the weights has created eight ranking solutions for the experiments, which is the novelty of this study. An amazing result was obtained that all eight solutions all determined the same best experiment. From the obtained results, a recommendation was proposed that the multi-criteria making decision methods and the weighting methods using in this study can also be used for multi-criteria making decision in other cases, other processes.
Gravity assists maneuver in the problem of extension accessible landing areas on the Venus surface
Authors: Eismont Natan A. , Zubko Vladislav A. , Belyaev Andrey A. , Zasova Ludmila V. , Gorinov Dmitriy A. , Simonov Alexander V. , Nazirov Ravil R. , Fedyaev Konstantin S.
Published: December 2021

This study discusses the usage of Venus gravity assist in order to choose and reaching any point on Venusian surface. The launch of a spacecraft to Venus during the launch windows of 2029 to 2031 is considered for this purpose. The constraints for the method are the re-entry angle and the maximum possible overload. The primary basis of the proposed strategy is to use the gravitational field of Venus to transfer the spacecraft to an orbit resonant to the Venusian one – with the aim of expanding accessible landing areas. Results of the current research show that this strategy provides an essential increase in accessible landing areas and, moreover, may provide an access to any point on the surface of Venus with a small increase in ∆V required for launch from the Earth and in the flight duration. The comparison with the landing without using gravity assist near planet is also given.
Use of high-sensitivity cardiac troponins in the emergency department for the early rule-in and rule-out of acute myocardial infarction without persistent ST-segment elevation (NSTEMI) in Italy
Authors: Clerico Aldo , Zaninotto Martina , Aimo Alberto , Dittadi Ruggero , Cosseddu Domenico , Perrone Marco , Padoan Andrea , Masotti Silvia , Belloni Lucia , Migliardi Marco , Fortunato Antonio , Trenti Tommaso , Malloggi Lucia , Cappelletti Piero , Galli Gianni Antonio , Bernardini Sergio , Sciacovelli Laura , Plebani Mario
Published: December 2021

Serial measurements of cardiac troponin are recommended by international guidelines to diagnose myocardial infarction (MI) since 2000. However, some relevant differences exist between the three different international guidelines published between 2020 and 2021 for the management of patients with chest pain and no ST-segment elevation. In particular, there is no agreement on the cut-offs or absolute change values to diagnose non-ST-segment elevation MI (NSTEMI). Other controversial issues concern the diagnostic accuracy and cost-effectiveness of cut-off values for the most rapid algorithms (0 h/1 h or 0 h/2 h) to rule-in and rule-out NSTEMI. Finally, another important point is the possible differences between demographic and clinical characteristics of patients enrolled in multicenter trials compared to those routinely admitted to the Emergency Department in Italy. The Study Group of Cardiac Biomarkers, supported by the Italian Scientific Societies Società Italiana di Biochimica Clinica, Italian Society of the European Ligand Assay Society, and Società Italiana di Patolgia Clinica e Medicina di Laboratorio decided to revise the document previously published in 2013 about the management of patients with suspected NSTEMI, and to provide some suggestions for the use of these biomarkers in clinical practice, with a particular focus on the Italian setting.
Transformation Plasticity in Carbonitrided PM-Steels: Quantification of Plasticity Effects in Dependence of the Part Density*
Authors: Damon J. M. , Dietrich S. , Schulze V.
Published: December 2021

To optimize heat treatment processes of case hardened components, heat treatment simulations are used to predict surface layer conditions. Only a precise knowledge and modelling of the transformation processes allows a trustworthy prediction of the hardness and residual stresses in the surface zone. The transformation plasticity mechanism plays an essential role in the heat treatment process and its correct simulation has a significant influence on the resulting calculated residual stress profiles and component distortion. Without considering transformation plasticity, simulative residual stresses are significantly overestimated [1]. In this work, powder metallurgical components are pressed and sintered and subsequently carbonitrided for a dilatometric investigation to characterize the correlation between transformation plasticity effect and the density. The results show a dependence of the austenite-martensite volume change that led to a significant difference of 0.5 Vol-%. A model describing the martensite volume change with respect to density is proposed. This also affects the description of the transformation plasticity constants (K) between K = 5 – 6 × 10–5 MPa–1 in dependence of density. With currently available data, the effect of chemical composition and density cannot be separated and quantified and further studies are therefore necessary to allow such a refinement.
Ti-Co mixed oxide as photocatalysts in the generation of hydrogen from water
Authors: Pérez-Larios Alejandro , Torres-Ramos Isabel , Zanella Rodolfo , Rico José Luis
Published: December 2021

The effect of Co into the titanium oxide matrix as photocatalysts in the generation of hydrogen from water is herein reported. Ti–Co mixed oxides and pure titania were synthetized by sol-gel. The Co content was 0, 1, 3, 5, and 10 wt.%. The solids were characterized by Scanning electron microscope-energy dispersive spectrometer (SEM-EDS), N2 physisorption, X-ray difrraction (XRD), ultraviolet visible spectroscopy (UV–Vis), spectroscopy Raman, X-ray photoelectron spectroscopy (XPS) spectroscopy and High resolution transmission electron microscope (HRTEM). The results showed that the mixed oxides show larger specific surface areas (73–186 m2/g) compare to that of pure TiO2 (64 m2/g). The XRD patterns of the Ti-Co samples resemble that of anatase and segregation of Co was not observed by this technique. The band gap energies of these solids vary from 3.05 to 2.85 eV which are smaller than that of pure TiO2 (3.2 eV). The Ti-Co oxides showed an enhancement in the hydrogen production (∼3056 μmol/h) compare to that of TiO2 (190 μmol/h) when using UV light. Furthermore, the photocatalytic activity of titania (110 μmol/h) for this reaction was also smaller than those observed for the Ti-Co mixed oxides (∼4056 μmol/h) under visible light.
Severe accident simulation for VVER-1000 reactor using ASTEC-V2.1.1.3
Authors: Abdel-Latif S. H.
Published: December 2021

The station black-out (SBO) is one of the main accident sequences to be considered in the field of severe accident research. To evaluate a nuclear power plant’s behavior in the context of this accident, the integral ASTEC-V2.1.1.3 code “Accident Source Term Evaluation Code” covers sequences of SBO accidents that may lead to a severe accident. The aim of this work is to discuss the modelling principles for the core melting and in-vessel melt relocation phenomena of the VVER-1000 reactor. The scenario of SBO is simulated by ASTEC code using its basic modules. Then, the simulation is performed again by the same code after adding and activating the modules; ISODOP, DOSE, CORIUM, and RCSMESH to simulate the ex-vessel melt. The results of the two simulations are compared. As a result of SBO, the active safety systems are not available and have not been able to perform their safety functions that maintain the safety requirements to ensure a secure operation of the nuclear power plant. As a result, the safety requirements will be violated causing the core to heat-up. Moreover potential core degradation will occur. The present study focuses on the reactor pressure vessel failure and relocation of corium into the containment. It also discusses the transfer of Fission Products (FPs) from the reactor to the containment, the time for core heat-up, hydrogen production and the amount of corium at the lower plenum reactor pressure vessel is determined.
Study on specific heat capacity and thermal conductivity of uranium nitride
Authors: Gokbulut M. , Gursoy G. , Aşcı Ş. , Eser E.
Published: December 2021

In this study, we have proposed an analytical method for calculating the specific heat capacity of uranium nitride nuclear material. The specific heat capacity results have obtained by the use of the Debye-Einstein approximation. The thermal conductivity of nuclear material has been obtained by using the experimental data of thermal diffusivity and the calculation results of specific heat capacity. This method shows that our results are satisfactory for the wide range temperature variations. The proposed approach can be easily applied to determine the thermodynamic properties of the other nuclear materials.
Series Under Threat
Authors: Laugier Sandra
Published: December 2021

Lockdown has given us an occasion to discover new television series and to revisit others. TV series accompany us in our ordinary lives, but they can also be a resource or refuge in extraordinary situations. As the enduring success of Friends proves, they provide us with universes of comfort. TV series provide strong common cultural referents, which populate both ordinary conversations and political debates. TV series, by virtue of their aesthetic format (their duration, weekly and seasonal regularity, and the fact that they are, or were until recently, usually viewed in the context of the home), the attachment they inspire to their characters, the democratization and diversification of modes of viewing them (internet, streaming, discussion forums), make possible a specific form of education and constitution of a public. TV shows are hence a medium for political and ethical discussion. The article studies two series, Homeland and The Bureau, which are paradigmatic examples of a genre that has grown exponentially since the beginning of the century, and which we refer to as the “security series” genre. These series are great works of art and can also be seen as powerful tools for educating and informing the public.
A conversation on the quartic equation of the secular determinant of methylenecyclopropene
Authors: Ramasami Ponnadurai
Published: December 2021

The Hückel method (HM) is based on quantum mechanics and it is used for calculating the energies of molecular orbitals of π electrons in conjugated systems. The HM involves the setting up of the secular determinant which is expanded to obtain a polynomial which is to be solved. In general, the polynomial is one which may be factorized. However, in May 2020, students brought to my attention that the secular determinant of methylenecyclopropene could not be factorized completely. As a result of this, we used a combination of online tools, technology and visualization to calculate the roots of the secular determinant. This write-up, in a playwriting format, describes the conversation between the facilitator and the students.
Anthropomorphised warlike beings with horned helmets: Bronze Age Scandinavia, Sardinia, and Iberia compared
Authors: Vandkilde Helle , Matta Valentina , Ahlqvist Laura , Nørgaard Heide W.
Published: December 2021

Horned-helmet imagery continues to raise questions about what is local and what is global in Bronze Age Europe. How similar is the imagery found on Sardinia, in southwestern Iberia and southern Scandinavia in material appearance, medium of representation, and sociocultural setting? Does it occur at the same point in time? Does it spring from or transmit a shared idea? Analysis reveals intriguing patterns of similarity and difference between the three zones of horned-helmet imagery 1000–750 BC. The results point to actors and processes at the local level while also pinpointing interconnections. Across all three contexts, horns signify the potency of the helmet wearer, the quintessential warrior. Horns visualise a defined group of bellicose beings whose significance stems from commemorative and mortuary rites, sites, and beliefs – in conjunction with political processes. We suggest that the eye-catching imagery of very particular males wearing horned insignia relates on the one hand to local control of metals and on the other to the transfer of novel beliefs and cults involving embodied gigantisation. It is characteristic that the horned figure is adapted into some settings, but only sparingly or not at all in others. This imagery has a complex history, with Levantine roots in the LBA Mediterranean. The Scandinavian addendum to the network coincides with the metal-led Phoenician expansion and consolidation in the west from c. 1000 BC. A Mediterranean–Atlantic sea route is suggested, independent of the otherwise flourishing transalpine trading route.
L-Type Calcium Channels Contribute to Ethanol-Induced Aberrant Tangential Migration of Primordial Cortical GABAergic Interneurons in the Embryonic Medial Prefrontal Cortex
Authors: Lee Stephanie M. , Yeh Pamela W. L. , Yeh Hermes H.
Published: December 2021

Exposure of the fetus to alcohol (ethanol) via maternal consumption during pregnancy can result in fetal alcohol spectrum disorders (FASD), hallmarked by long-term physical, behavioral, and intellectual abnormalities. In our preclinical mouse model of FASD, prenatal ethanol exposure disrupts tangential migration of corticopetal GABAergic interneurons (GINs) in the embryonic medial prefrontal cortex (mPFC). We postulated that ethanol perturbed the normal pattern of tangential migration via enhancing GABAAreceptor-mediated membrane depolarization that prevails during embryonic development in GABAergic cortical interneurons. However, beyond this, our understanding of the underlying mechanisms is incomplete. Here, we tested the hypothesis that the ethanol-enhanced depolarization triggers downstream an increase in high-voltage-activated nifedipine-sensitive L-type calcium channel (LTCC) activity and provide evidence implicating calcium dynamics in the signaling scheme underlying the migration of embryonic GINs and its aberrance. Tangentially migrating Nkx2.1+GINs expressed immunoreactivity to Cav1.2, the canonical neuronal isoform of the L-type calcium channel. Prenatal ethanol exposure did not alter its protein expression profile in the embryonic mPFC. However, exposing ethanol concomitantly with the LTCC blocker nifedipine prevented the ethanol-induced aberrant migration bothin vitroandin vivo. In addition, whole-cell patch clamp recording of LTCCs in GINs migrating in embryonic mPFC slices revealed that acutely applied ethanol potentiated LTCC activity in migrating GINs. Based on evidence reported in the present study, we conclude that calcium is an important intracellular intermediary downstream of GABAAreceptor-mediated depolarization in the mechanistic scheme of an ethanol-induced aberrant tangential migration of embryonic GABAergic cortical interneurons.
Application of spatial auto-beta models in statistical classification
Authors: Zikarienė Eglė , Dučinskas Kęstutis
Published: December 2021

In this paper, spatial data specified by auto-beta models is analysed by considering a supervised classification problem of classifying feature observation into one of two populations. Two classification rules based on conditional Bayes discriminant function (BDF) and linear discriminant function (LDF) are proposed. These classification rules are critically compared by the values of the actual error rates through the simulation study.
Activities of the Lithuanian Mathematical Society in 2018–2021
Authors: Leipus Remigijus
Published: December 2021

The article gives a survey of mathematical life and activities of the Lithuanian Mathematical Society during the past four years.
Chimera state in coupled map lattice of matrices
Authors: Mačernytė Kotryna , Šmidtaitė Rasa
Published: December 2021

In recent years, a lot of research has focused on understanding the behavior of when synchronous and asynchronous phases occur, that is, the existence of chimera states in various networks. Chimera states have wide-range applications in many disciplines including biology, chemistry, physics, or engineering.

The object of research in this paper is a coupled map lattice of matrices when each node is described by an iterative map of matrices of order two. A regular topology network of iterative maps of matrices was formed by replacing the scalar iterative map with the iterative map of matrices in each node. The coupled map of matrices is special in a way where we can observe the effect of divergence. This effect can be observed when the matrix of initial conditions is a nilpotent matrix.

Also, the evolution of the derived network is investigated. It is found that the network of the supplementary variable $\mu$ can evolve into three different modes: the quiet state, the state of divergence, and the formation of divergence chimeras. The space of parameters of node coupling including coupling strength $\varepsilon$ and coupling range $r$ is also analyzed in this study. Image entropy is applied in order to identify chimera state parameter zones.
Pseudo-Heronian triangles whose squares of the lengths of one or two sides are prime numbers
Authors: Mazėtis Edmundas , Melničenko Grigorijus
Published: December 2021

The authors introduced the concept of a pseudo-Heron triangle, such that squares of sides are integers, and the area is an integer multiplied by $2$. The article investigates the case of pseudo-Heron triangles such that the squares of the two sides of the pseudo-Heron triangle are primes of the form $4k+1$. It is proved that for any two predetermined prime numbers of the form $4k+1$ there exist pseudo-Heron triangles with vertices on an integer lattice, such that these two primes are the sides of these triangles and such triangles have a finite number. It is also proved that for any predetermined prime number of the form $4k+1$, there are isosceles triangles with vertices on an integer lattice, such that this prime is equal to the values of two sides and there are only a finite number of such triangles.
Magnitude, number and school mathematics
Authors: Norvaiša Rimas
Published: December 2021

Definitions of concepts of magnitude and number used in academic mathematics are not suitable for school mathematics for reasons of their cognitive complexity. We discuss possible ways to treat magnitudes and numbers in school mathematics based on mathematical reasoning.
Genetic and imaging study of a case with multiple malformations: limb body wall complex
Authors: Celis Luis Gustavo , Almonacid Isabel Cristina , Velasquez Esperanza , Fernandez Isabel , Dorado Jose , Ferrero Andreina Zannin , Quintero Paola Zuleta , Viasus Maria Camila Garzon , Cardenas Sergio Vergara , Bracho Fernandez Ana Isabel
Published: December 2021

The Limb-Wall Complex is a rare and sporadic congenital anomaly characterized by multiple craniofacial and thoracoabdominal malformations as well as involvement of the spine and lower extremities. The etiology is unknown and the chromosomal study is normal, however, it is related to an alteration in the formation of the umbilical cord (short umbilical cord), abdominal placental insertion and persistence of the extraembryonic coelom. This condition causes intracavitary organs to be exposed and adhered to the placenta and consequently also attached to the mother’s uterus. The diagnosis can be made from the first trimester of gestation with a nuchal translucency ultrasound in order to detect this pathology in time and to be able to offer good genetic counseling to the parents, since the prognosis is not favorable
Yogurt reduces the risk of infection of COVID—19
Authors: Hui Lei , Tao Xiang
Published: December 2021

Objective: To investigate whether yogurt reduces the risk of infection of COVID—19. Methods: 10000 citizens in Wuhan who drink yogurt every day and 10000 citizens in Wuhan who do not drink yogurt were retrospective reviewed by telephone follow-up. Results: The positive rate of COVID—19 nucleic acid detection was 0.13% among the 10000 people in Wuhan who drink yogurt every day. The positive rate of COVID—19 nucleic acid detection was 7.89% among the 10000 people in Wuhan who do not drink yogurt. The COVID—19 infection rate of the citizens who drink yogurt every day is significantly lower than that of the citizens who do not drink yogurt. Conclusion: Yogurt reduces the risk of infection of COVID—19.
Design and fabrication of human skin by threedimensional bioprinti
Authors: Sannam Khan Rabia , Yousuf Qudoos
Published: December 2021

Skin has an essential role in preserving homeostasis and in maintaining the safety of the human body from outside environment by playing its role as the largest body part of human. The stratified, categorized and complex arrangement of skin gives a physical protection to the body by maintaining and regulate the transportation of metabolites and water off the body. The injuries that can originate after any chemical or physical trauma can cause impairment of skin barrier and its physiological functions.1 In skin injuries, considerable amount of skin can be lost, and it develops extremely critical to replace injury caused impaired skin. Transplants in order to protect the lots of water from body and to save the body from opportunistic pathogens can replace the impaired skin. Skin grafts can also expedite the wound recovery procedure and support and restore the barrier and can maintain the regulatory functions on the site of wound.2,3 Apart from grafts tissue engineered skin plays an exceptionally beneficial role and in vitro stage for the evaluation of skin permeability and adverse inflammation response. The tissue-engineered skin has several advantages in comparison to animal skin by having the major significance by mimicking the skin physiology and easing the ethical concerns of animal use. Additionally, tissue engineered skin models also give the significant insights into the causes of skin diseases, hence, explicate the pathophysiological mechanisms in order to see the progression, and can help in the treatment of skin disease.4,5 It has been seen that numerous tools have become accessible for the tissue engineering and are adopting different novel approaches and technologies, and amongst these 3D bioprinting offers many significant advantages Since it is possible of dispensing live cells, phase changing hydrogels, insoluble factors and maintaining high cell viability in a desired pattern.6
Evaluation of bond strength in lithium disilicate ceramics subjected to different times and methods of removal of hydrofluoric acid residues
Authors: Pérez Raquel Yokebed Guerra , Trujillo Anthony Pierre Bolaños , Bittencourt Bruna Fortes , Alayo Pablo Chavez , Murillo Diego Alonso Melendez , Dominguez John Alexis
Published: December 2021

Objective: To evaluate the bond strength in lithium disilicate ceramics subjected to different times and methods of removal of conditioning residues. Materials and methods: Bonding strength was evaluated in lithium disilicate discs after conditioning with hydrofluoric acid, the samples were subjected to different times and methods of removal: air-water spray, ultrasonic bath with distilled water 2 min, ultrasonic bath with distilled water 4 min, phosphoric acid 2 min, phosphoric acid 4 min. Cylinders were made of flowable composite resin that were positioned on the discs. The samples were subjected to micro-shear tests on a universal testing machine. Results: The two-way ANOVA test and the Pos Hoc Tukey test (p<0.05) revealed that the ultrasonic bath group with distilled water 2 min presented significant difference with respect to the phosphoric acid 4 min; however, it did not present significant difference with respect to the other groups. Conclusion: The ultrasonic bath removal method for 2 min presented the highest value of bonding strength.
NEURAL CORRELATES OF SIMPLE SENSOMOTOR REACTION AS MARKERS OF INFORMATION PROCESSING SPEED IN MILITARY VETERANS
Authors:   ESC “Institute of Biology and Medicine” of Taras Shevchenko National University of Kyiv, Ukraine, Podkovka O.I. , Makarchuk M.Y. ,   ESC “Institute of Biology and Medicine” of Taras Shevchenko National University of Kyiv, Ukraine, Filimonova N.B. ,   ESC “Institute of Biology and Medicine” of Taras Shevchenko National University of Kyiv, Ukraine, Knyr O.S. ,   ESC “Institute of Biology and Medicine” of Taras Shevchenko National University of Kyiv, Ukraine, Pampuha I.V. ,   ESC “Institute of Biology and Medicine” of Taras Shevchenko National University of Kyiv, Ukraine, Horbunov O.A. ,   ESC “Institute of Biology and Medicine” of Taras Shevchenko National University of Kyiv, Ukraine
Published: December 2021

We examined the latent periods (LP) of simple sensorimo- tor reaction (SSMR) and peculiarities of brain connectiv- ity during carrying out tests on SSMR in the group of veterans of Joint Forces Operation (JFO) and in military men-patients with post-traumatic stress disorder (PTSD) and with mild traumatic brain injury (mTBI). To this aim, we used a computer test with coherent analysis of EEG. Differences in brain activation were analyzed by LORETA method. It was shown that the speed of SSMR in the group of JFO veterans was significantly lower than in the con- trol group. The LP of SSMR in the group of JFO veterans were 279 ms vs 258 ms in the control group. Comparative analysis of SSMR LP in the group of JFO veterans and in the group with PTSD as well as group with mTBI did not reveal significant differences. The EEG study and coherent analysis showed a significant decrease in the brain connectivity in the group of JFO veterans compared to control group, especially in the low frequency ranges. There were no significant differences in brain activation between the JFO veterans, PTSD and mTBI patients, but JFO veterans had significantly lower activation of cu- neus, middle occipital gyrus and lingual gyrus compared to control group. Conclusively, in order to detect hidden brain lesions, an additional medical examination may be recommended for JFO veterans.
THE CONDITION OF BRAINSTEM PART OF THE AUDITORY ANALYZER IN DIABETES MELLITUS TYPE 2 PATIENTS WITH HEARING IMPAIRMENT
Authors:   Kolomiychenko Institute of Otolaryngology NAMS of Ukraine, Kyiv, Ukraine, Shydlovska T.A. , Shydlovska T.V. ,   Kolomiychenko Institute of Otolaryngology NAMS of Ukraine, Kyiv, Ukraine, Navalkivska N.Y. ,   Kolomiychenko Institute of Otolaryngology NAMS of Ukraine, Kyiv, Ukraine
Published: December 2021

The purpose of our study is to examine the condition of brainstem part of the auditory analyzer based on examination of the short-latent auditory evoked potentials (SLAEP) in 43 patients with diabetes mellitus (DM) type 2 with disorders of auditory function. We revealed sensorineural hearing loss (SNHL) of the I-II degree according to the internation- al classification. The registration of SLAEP was conducted by the system «Eclipse» «Interacoustics» (Denmark). We detected a lengthening of the latent periods of the peaks (LPP) of the II, III, IV and V waves of SLAEP, as well as the inter-peak intervals of I-III and I-V comparing to the control values. So, LPP of III wave SLAEP was 3.85 ± 0.04 ms, and of V wave was 5.83 ± 0.05 ms. According to the severity of DM type II, we divided the patients into two groups: without (group I) and with (group II) complica- tions. A comparative analysis revealed that the values of LPP III wave and also I-III in group 2 not only significantly exceeded the normal values, but also significantly differed from the same indicators in group 1. Thus, the LPP of the III wave of SLAEP was 3.81 ± 0.03 and 3.95 ± 0.05 ms, in group 1 and 2, respectively. In group 2 inter-peak interval I-III was 2.29 ± 0.03 ms, inter-peak interval I-V was 4.21 ± 0.04 ms. This indicates the possible influence of the complicated course of diabetes mellitus II on the development of disorders in the central departments of the auditory analyzer, particular in its brainstem structures. Therefore, among all studied groups of patients with SNHL on the background of DM type II there are a pronounced deviations from the norm in the state of the brainstem part of the auditory analyzer. The obtained data indicate an important role of the state of brainstem part of auditory analyzer in the development of sensorineural hearing disorders in diabetes mellitus type II.
SOLAR BATTERIES AS AN ELEMENT OF DESIGN OF MODERN ENERGY EFFICIENT BUILDINGS
Authors:   V.  E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, Pekur I. V.
Published: December 2021

The concept of increasing the energy efficiency of buildings by placing solar panels on their facades is considered. This solution is evaluated from the point of view of modern urban design, and the possibilities of increasing the energy efficiency of lighting systems of modern buildings with the use of solar panels for their power supply are determined. The implementation of a combination of power from renewable energy sources and from the stationary grid in the absence of energy storage systems (batteries) allows to create systems capable of using almost all the electricity generated by an alternative energy source. In this case, energy losses to energy transportation will be minimal. The absence of such battery systems in the designs allows to install only the design-calculated number of solar panels without the need to make a significant backup of generating capacity for its accumulation or operation in adverse weather conditions. An additional advantage of abandoning energy storage - batteries, is a significant reduction in the use of environmentally hazardous substances such as lead, lithium and acidic or alkaline electrolytes, the production of which has a negative impact on the environment, and their disposal requires additional costs. In the work, it is proposed to use cassette facade systems with built-in solar panels, which allow architects to create a modern appearance of buildings and structures. It is shown that in the absence of solar tracking systems, the reduction in generation is 23% for the case of horizontal expansion of solar panels compared to the case of the optimal angle (for Kyiv 40o) and 40% for the case of vertical installation of solar panels. The analysis indicates the possibility of creating a modern energy-efficient design of building facades, both in the design of modern buildings and in the restoration of facades of existing buildings.
INVESTIGATION OF THERMAL RADIATION ANGULAR AND POLARIZATION CHARACTERISTICS OF ONE-DIMENSIONAL PHOTONIC STRUCTURES ON A FINITE SUBSTRATE
Authors:   V.  E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, Maslov V. P.
Published: December 2021

One-dimensional photonic structures (PS) are the layered metamaterials, which optical properties are due to interference effects within the structure. Due to the interaction of electromagnetic waves with the periodic structure, the thermal radiation (TR) of such PS has the features of coherent: it has a selective spectrum and a petal pattern. The relevance of TR PS research is due to the search for new materials to create sources of infrared (IR) radiation in the middle and far IR range (with a wavelength > 5 μm). The second important area of application of the radiating properties of the PS is the creation of non-radiating coatings to remove unwanted TR from the heated surfaces of the IR devices. Despite the fact that the irradiative properties of PS have been studied quite well, in the literature insufficient attention is paid to the influence of the finite substrate on the parameters of TR structures. The influence of a finite incoherent substrate on the angular and polarization characteristics of the thermal radiation of the system (photonic structure)/substrate has been investigated. Systems consisting of plane-parallel Ge or Si plates as PS and incoherent BaF2, BaF2/Al and Al substrates were used in experimental studies. It has been established, the contrast and amplitude of the directional diagram petals of the TR system depend on the ratio of the optical characteristics of the photonic structure and the substrate. The presence of a strongly reflective substrate eliminates the difference between the angular dependences of the s- and p-polarized components of the TR. In the case when the PS is placed on a transparent incoherent substrate with a lower refractive index, there is an increase in the p-polarized component of the TR and the suppression of the s-polarized. The thermal imaging picture of the TR angular distribution of the Si/Al system has been recorded and it was experimentally proved that the TR of photonic systems exhibits circular patterns. The results of the work can be used in the development of narrowband emitters in the middle and far infrared range, coatings to increase radiation energy exchange and coatings with minimal emissivity that are invisible in the thermal range.
DIAGNOSIS OF SEMICONDUCTOR HETEROSYSTEMS USING THE PHOTOVOLTAIC METHOD
Authors:   V.  E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, Shekhovtsov L. V.
Published: December 2021

The diagnostic method is as follows: the lateral photo-EMF spectral characteristics are measured, generated in the structure (or device) when illuminated by wavelength light with a near the edge of the basic semiconductor layer. For illustrations of efficiency method the given part of the measurement results for Schottky contact samples with a nitrogen concentration of 5% and a thermal annealing temperature of 900 and 950°C. It has been found that a significant character and a small amplitude of such a characteristic indicates qualitative at a homogeneity and the necessary magnitude of the potential barrier (or barriers), that it is necessary to form to make Schottky contact or other structure. A significant characteristic and a small amplitude of such a characteristic indicates a qualitative one-line and the required value of a potential barrier (or barriers) that must be formed for the manufacture of a semiconductor structure or device. If the spectral characteristic has one maximum and amplitude that is many times higher than the amplitude of a significant characteristic, then this indicates a formed transition layer between components of heterosystems with high, compared with a quasine-power region of semiconductor, conductivity. The presence of such a layer increases the probability breaks down of the microelectronic device. Investigation of the distribution of lateral photours along the metal semiconductor interface compliant interpretation of spectral characteristics features. The linear significant form of distribution of EMF confirms the presence of a transition layer with a lower doping level compared with GaAs. An important feature of the diagnostic method is its non-destructive character, as well as the possibility of applying to semiconductor or devices based on them, in which the photovoltaic effect may occur.
Sensitivity to Mn content mechanical properties of phase composition of ADI
Authors:   I. M. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Kyiv, Ukraine, Gogaev K. О. , Podrezov Yu. M. ,   I. M. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Kyiv, Ukraine, Voloshchenko S. M. ,   I. M. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Kyiv, Ukraine, Askerov M.G. ,   I. M. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Kyiv, Ukraine, Minakov M.V. ,   I. M. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Kyiv, Ukraine
Published: December 2021

The effect of manganese content on the phase composition and mechanical properties was studied on ADI materials that are isothermally quenchеd at different temperatures. ADI samples with Mn content of 0.78% and 0.24% were analyzed. The final structure of the cast iron was created by austenitizing heating at 900 ° C for 30 minutes. and subsequent isothermal quenching in liquid tin at temperatures of 310, 330, 350, 380 ° C for samples with high manganese content and at 350, 370 ° C for samples with low content. It is shown that increasing the manganese content increases the amount of residual austenite under the same quenching conditions. This enhances the positive role of the TRIP effect on the hardening processes. In particular, ADI with a high content of Mn show a higher rate of strengthening at the initial region of loading diagram, higher hardness and increased damping capacity. Instead, due to the embrittlement action of manganese, such materials have lower mechanical characteristics, which determined fracture moment. It was found that for the same quenching conditions, deformation to fracture and toughness are reduced by half on samples with higher manganese content. The negative effect of manganese on the fatigue is less significant, because the embrittlement action is compensated by phase transformations in the crack head, which inhibits its spread under cyclic loading. Due to the fact that manganese enhances the positive role of the TRIP effect but decrease fracture résistance, it is proposed to use ADI materials with high Mn content in products that operate in conditions of wear but are not subject to extreme stress. Keywords: ADI materials, manganese alloying, isothermal hardening, TRIP effect, retained austenite, strengthening, hardness. damping capacity.
Structure and wear of gradient steel castings
Authors:   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Kondratyuk S.Ye. , Veis V.I. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Parkhomchuk Z.V. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Loktyonov-Remyzovskii V.A. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv
Published: December 2021

The effect of overheating of the melt over the equilibrium liquidus in the temperature range 1570 °C – 1670 °C and the rate of its cooling during crystallization and structure formation of castings on the formation of the length and morphology of the main macrostructural zones, grain dispersion, characteristics of the fine crystal structure, hardness and intensity of abrasive wear over the section of 25L steel castings with a differentiated cast structure was investigated. Regular changes of these indicators depending on thermokinetic conditions of crystallization are established. The determining influence of the melt cooling rate on the morphology and dispersion of the cast structure due to different degrees of melt supercooling during crystallization of different structural zones of castings is shown. As the distance from the rapidly cooling surface of the castings and taking into account the increase in the temperature of the melt overheat from 1570 ºC to 1670 ºC, the grain size varies from 5… 7 numbers to 1… 2 numbers, respectively. In the case of normal heat removal rate during crystallization, the grain size in the castings varies from 4… 2 to -1… -2 numbers. The determined characteristics of wear resistance of steel in different structural zones correlate with changes in the characteristics of the cast structure and the cross-sectional strength of castings. The research results open the prospect of developing new foundry technologies for the production of cast products with differential properties for special operating conditions. Keywords: gradient structure, structural zones, melt, wear.
Influence of MHD - plasma melt processing on the structure and properties of cast aluminum alloy A390
Authors:   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Narivsky A.V. , Smirnov O.M. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Panarin V.E. ,   G. V. Kurdyumov Institute for Metal Physics of NAS of Ukraine, Kyiv, Ukraine, Skorobagatko Yu.P. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Goryuk M.S. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Tverdokhvalov V.O. ,   Physico-Technological Institute of Metals and Alloys of NAS of Ukraine, Kyiv, Ukraine, Lomakin V.M. ,   Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine
Published: December 2021

Growth of production of cast products and the desire of enterprises to reduce the cost of manufacturing metal products led to a significant increase in requirements for the structure and properties of aluminum alloys. Increasing of physical and mechanical properties of alloys is most effectively at the stages of their preparation in liquid state. At that, it is possible to affect effectively on the quality of cast metal by external actions on alloys, deep refining from gases and harmful impurities, active modifying of alloy, reducing or eliminating the negative impact of heredity of charge materials. The main disadvantage of the processes of structure refinement of alloys by using modifiers is instability of their results, which depends on various reasons. One of the most important reasons is providing conditions for the formation and preservation of active modifier particles in the melt volume. They are assimilating by liquid alloy and acting on crystal nucleus at crystallization. It is known that only ~10% particles are active of the total number of particles added with the ligature into the melt. Other particles dissolve in the melt, take away by the crystallization front, or push back on to intergranular boundaries. The considered methods of electromagnetic, MHD and plasma actions on liquid metal allow to refine and modify alloys without use of special reagents. The paper presents studying of the structure and properties of supereutectic silumin A390 after treatment in casting magnetodynamic installation (MDI) by submerged into melt the plasma argon jet and alternating electromagnetic field & magnetohydrodynamic (MHD) effects, including simultaneous combination. There are developed the scientific and technological bases of MHD-plasma processing of liquid hypereutectic silumin A390 and original equipment for their realization. It provides dispersed structure of solidified alloy. Thus, there is a significant decreasing of sizes both particles of primary silicon and dendrites of α-solid solution of aluminium. Also, strength characteristics of alloys increased to 10%, and elongation rises up in 1.5-2 times. Keywords: plasma jet, magnetodynamic installation (MDI), aluminum alloy, mechanical properties.
Analysis of research programs: a sociological perspective
Authors: Reznik Volodymyr
Published: December 2021

The origins and content of the methodology of scientific research programs of I. Lakatos are considered taking into account the problems and tasks of the history of sociology. The reception of the methodology of research programs in sociology can be explained by the relevance of the analytical model of the structure and dynamics of the research program in the analysis of sociological knowledge. Within the framework of sociological knowledge, metatheoretical, theoretical and empirical structural levels are analytically distinguished. Certain structural analogies are observed: between the “hard core” and “negative heuristics” of the research program, on the one hand, and metatheory, on the other; between the “protective belt” and the “positive heuristic” of the research program, on the one hand, and theory, on the other; between the empirical content of the research program, on the one hand, and the empirical basis of sociology, on the other. One can observe a number of analogies in the dynamics of functional connections between the structural components of the research program, on the one hand, and the dynamics of functional connections between metatheorizing, theorizing, and empirical analysis in sociology, on the other.
About Conditions of Spatial Collapse in an Infinite System of Bose Particles
Authors: Grinyuk B.E. , Bugaev K.A.
Published: December 2021

Using the variational principle, we show that the condition of spatial collapse in a Bose gas is not determined by the value of the scattering length of the interaction potential between particles contrary to the result following from the Gross–Pitaevskii equation, where the collapse should take place at a negative scattering length.
Стан і перспективи розвитку досліджень у галузі корозії та протикорозійного захисту конструкційних матеріалів в Україні
Authors: Хома Мирослав Степанович
Published: December 2021

У доповіді акцентовано увагу на актуальності для України питання корозії та протикорозійного захисту металоконструкцій і промислового обладнання. Наведено результати досліджень, які в цій галузі проводять установи НАН України, заклади вищої освіти та акредитовані лабораторії. На прикладі ПАТ «Укрнафта» та ТОВ «Укрінсталькон» продемонстровано відповідальний підхід підприємств до протикорозійного захисту обладнання та металоконструкцій. Розглянуто стан робіт з корозійного моніторингу, розроблення нових інгібіторів корозії з екологічно чистої сировини, дослідження сірководневої та вуглекислотної корозії у нафтогазовидобуванні тощо. Показано роль Міжвідомчої науково-технічної ради з питань корозії та протикорозійного захисту металів у визначенні пріоритетних напрямів робіт з цієї проблематики.