bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessment of factors responsible for farmers-herders conflict in Benue state north central, Nigeria¬
Authors: ADARIKU Michael Ejim  , LAGI Theophilus D  , SALIHU Muhammed Gani
Published: May 2023

Beyond the aggravating effects of climate change on both sedentary agrarian farming communities and the pastoral herders, are other man made factors, which could be seen in the persistent occurrence of farmers-herders conflicts in Benue State and across various parts of Nigeria, thus a clog in the wheel of progress to national development and cohesion. It was against this background that this study engaged conflict theory to examine the factors responsible for farmers-herders conflict in Benue State. The study employed Taro Yamane sampling technique on administered five-Likert scale questionnaire. Findings from study on the factors responsible for farmers-herders conflict reveals that encroachment on farm lands and crop destruction by cattle stands at (71.1%), Unemployment and poverty (62.9%),Communication barrier/Mutual distrust (64.2%), inadequate grazing reserves/Blockage of grazing routes (68.4%,), Raping/Kidnapping of women (59.4%), Land ownership tussle/ Indigenization (51.6%), Cattle rustling/Theft (26.6%) and Contamination of river bodies by cattle (71.9%). The deduction therefore is that majority of the respondents emphatically agreed with all the factors mentioned above as the major causes of the conflict in Benue and Nigeria in general. However, the opinions of most respondents out rightly rejected cattle rustling as a major cause of the conflict in the study area. The study recommends that the establishment of modern functional cattle ranches will significantly address the issues of grazing routes blockage and encroachment on farm lands/crop destruction which will drastically reduce or completely eliminate farmers-herders conflict in Nigeria. This study also recommends the urgent implementation of the National Young Farmers Scheme’ aimed engaging modern methods of farming by engaging 1,000 farmers from each of the 774 Local Government. That Federal government should evolve genuine and workable national strategies of disarming the armed killer herdsmen parading farming communities in Benue with sophisticated weapons of Ak47 to commit carnage, and rape against farming communities.
Terrorism, insurgency economy, and human security in Borno state, Nigeria
Authors: UNACHUKWU Ugochukwu Vitus  , ERUNKEN Canice Esidene  , MUAZU  , Muhammed Bello  , IGWEBUIKE Ozoemene Paul
Published: May 2023

Terrorism is designed is to create sense of public insecurity, showcase State’s inability to arrest violence, and it is severally oiled by an insurgency economy that benefits all stakeholders except the masses as seen in Borno State in the northeast of Nigeria. Terrorism could be seen jeopardizing human security extensively and pushing children outside the literacy nets, into vulnerability of recruitment and radicalization and same goes for the farming communities whose produce are extensively endangered by terror cell groups’ heinous campaign in Borno State. It was against this background that this study engaged criminal deterrence theory to examine terrorism and its implication for security of Borno State. This study decompose insecurity into food security and education security. This study employs exploratory research design with reliance on publicly available archive documents. The study relies solely on secondary data. The research is conducted by examining literature concerning terrorism and human security. Literature from non-serial publications, official reports, and conferences has been included particularly if they have been cited by other references in connection with terrorism, food security, education security and terror cell groups. Findings from this study showed that activities of terror cell groups negatively affect education security and food security. This study concluded that there is the need for governments across board to identify and dislodge the insurgency economy profiting and prolonging the insurgency. This study therefore recommends that Borno state government in conjunction with intergovernmental bodies should consolidate further the Safe School Initiatives to further ensure safety of “at risk schools”. This study also recommends that the government across board should conscientiously stem the farming and market vulnerability of the farming community and prevent looming food insecurity.
Site suitability analysis for locating petroleum stations using analytical hierarchy process (AHP) and MCDA approach: a case of Wolayita Sodo town, Ethiopia, Africa
Authors: Fiseha Mara  , SS. Manugula  , Marga Tashale Amanu
Published: May 2023

This study allows the local people as well as planners for the appropriate plans of land use planning in sustainable petroleum station of Wolayita Sodo town, Ethiopia, East Africa. The problem of haphazard location of petrol stations is one of the major difficulties at Wolayita Sodo towns. Due to less scientifically accepted sites and lack of attention to planning standards that has experienced the planning methods are expressed in poor sitting. The main objective of this study is to identify appropriate for locating petroleum stations and assessing existing stations by using Analytical Hierarchy Process (AHP) & Multi-Criteria Decision Analysis (MCDA) techniques. This study demonstrates the use of an integrated Idris 17.1 and Arc GIS 10.3.1 are used for to designate petroleum station site in the study area. MCDA consists of a series of techniques that permit a range of criteria relating to a particular issue to be scored, weighted and then ranked by their degree of suitability or importance for locating a particular facility or service to locate the suitable petroleum station site. The thematic maps of these criteria were prepared and standardized using pair wise comparison matrix. A weight for each criterion was given by comparing them with each other according to their importance, the consistence of comparing matrix were checked by calculating the consistence ratio (CR). The consistency ratio of this study indicated that 0.04 which is less than 0.1. Thus, consistent matrix was formed which was acceptable in order to combine all the mapping layers.
Rapunzel syndrome and small bowel Intussusceptions in a girl: A case report
Authors: Hussein-Choukri AHMANNA  , Ahmed EL BOUKHARY  , Najoua ABALLA  , Ibtissam ZOUITA  , Dounia BASRAOUI  , Mohamed OULAD SAIAD  , Hicham JALAL
Published: May 2023

Trichobezoars are indigestible masses of ingested hair commonly found in the stomach, often presenting with symptoms related to gastric outlet obstruction and severity related to the mass’s size and location. Rapunzel syndrome is caused by gastric trichobezoar with extended tail and small bowel obstruction. Patients with gastric trichobezoar can be asymptomatic until the bezoar increases in size. We report a case of a 8 years old girl who visited the emergency department with abdominal pain. She was finally diagnosed with Rapunzel syndrome that causes multiple small bowel intussusceptions associated with trichophagia. Surgery was needed to reduce the multiple intussusceptions, and to remove the large trichobezoar. This case highlights to consider the possibility of Rapunzel syndrome when diagnosing the main cause of intussusceptions.
Nasopalatine cyst excision and bone regeneration
Authors: Gabriela Vanessa Cobos Andagoya  , Karina Estefanía Sanguil Vásquez  , Leonardo Flavio Cabrera Maldonado  , Hugo Xavier Guamán Roldan
Published: May 2023

Introduction: The nasopalatine cyst is a non-odontogenic cyst, located within the nasopalatine duct of the maxilla, its diagnosis in most cases is by routine radiological finding and in other cases by the presence of symptomatology; coming to generate pain, paresthesia and visible signs such as facial deformities. Case description: The objective of this article is to make a literature review and presentation of the case of a 38-year-old male patient, who comes to the consultation for presenting an increase in volume in the anterior maxilla, of two years of evolution that presented favorable results after excision and placement of bone graft. Final considerations: Nasopalatine cyst represents less than 5% of the cysts at maxillary level and its recurrence is low. When it is a large cyst with destruction of the surrounding bone tissue, the best option is the use of a bone graft depending on biocompatibility, the affected site and costs. Demineralized bone matrix (DBX) is considered the gold standard due to its capacity for osteoinduction, osteoconduction and osteogenesis.
The new vision of mitochondrial permeability transition pore opening
Authors: Kasumov E.A  , Kasumov R.E.  , Kasumova I.V.
Published: May 2023

Mitochondria play a fundamental role in the functioning of the body but are also responsible for dysfunction, apoptosis, and death, associated with the mPTP (mitochondrial permeability transition pore) opening. Despite the fact that there are many articles on this topic, none of them solve the problem of PTP identification. The opening of the PTP is elicited by matrix Ca2+ and stimulated by binding of cyclophilin D (CyPD), Pi, elevated concentration of reactive oxygen species (ROS), free fatty acids, or diminished transmembrane potential. Nucleotides, Mg2+, and the binding of (cyclosporin A) CsA are known molecular inhibitors of PTP opening, whereas arginine-speciﬁc adducts of phenylglyoxal modulate PTP opening in a species and net-charge-dependent manner. It seems to us that the reason for the unresolved problem of mPTP lies in ignorance of the functioning of ATP synthase. According to our mechano-chemiosmotic mechanism we suggest that in ATP synthase two channels are connected, consisting of a c-ring of Fо and, α3β3-hexamer with a cap the oligomycin sensitivity conferring protein (OSCP) subunit of F1 in mitochondria closing a c-ring. In our opinion, OSCP subunit together with α3β3-hexamer act as an analogue of adenine nucleotide translocase (ANT), which can be designated as F1-ANT. It exchanges synthesized 3-ATP molecules in the active center of ATP synthase for 3-ADP molecules from the matrix with the participation of sodium and magnesium ions. Thus, we conclude that both ANT in the membrane and F1-ANT (OSCP subunit together with α3β3-hexamer) in the complex with the c-ring of ATP synthase are jointly involved in the functioning of mPTP.
Condroblastoma de tálus: relato de caso
Authors: Barbosa Thiago Moreth da Silva , Souza Antonio Marcelo Gonçalves de , Alves João Victor de Lima Brito , Moreth Micaella dos Santos Andrade , Vieira Kellem Carol Muniz , Freire Vitor Benedito Ferreira
Published: May 2023

O condroblastoma é um tumor cartilaginoso benigno raro, que compreende aproximadamente 1% de todos os tumores ósseos. Costuma ocorrer em pacientes dos 10 aos 25 anos de idade, sendo mais frequente em homens (2:1). Geralmente se localiza na epífise dos ossos longos, principalmente em fêmur distal, tíbia e úmero proximal, em indivíduos com fise aberta. Esse artigo traz um caso de um condroblastoma de tálus, apresentação atípica do tumor, com poucas publicações semelhantes na literatura. Trata-se de um paciente masculino, de 33 anos, com queixa de dor em tornozelo esquerdo há cerca de três anos. Após exames de imagem e histopatológico foi confirmada a hipótese de condroblastoma, e realizada ressecção com margem intralesional.
Hálux varo pós-traumático: tratamento por intermédio da técnica Mini TightRope
Authors: Gomes Marília Agostinho de Lima , Arruda André Taumaturgo Cavalcanti , Filho Pignatário de Andrade , Gonçalves Romeu  Krause , Neto José Fernandes Arteiro , Gomes André Cipriano Saraiva
Published: May 2023

O hálux varo é um acometimento infrequente na rotina ortopédica e consiste no desvio medial do hálux em relação ao primeiro metatarso. No presente artigo, relatamos o caso de uma paciente, do sexo feminino, com 45 anos, que chegou ao serviço de saúde após sofrer um trauma na região do pé direito. A paciente evoluiu com uma deformidade, ao apresentar um hálux varo pós-traumático, que necessitará de posterior intervenção cirúrgica. Para tanto, foi aplicada a técnica Mini TightRope, a qual apresentou vantagens em relação a outras estratégias cirúrgicas, já que pode promover a reabilitação funcional e estética do paciente.
Periarticular joint arthritis after ankle replacement vs. ankle arthrodesis. A systematic review
Authors: Pasache Lozano Rocio del Pilar , Morash Joel , O'Neill Shane , Glazebrook Mark
Published: May 2023

Objective: To complete a comprehensive literature review to determine the quantity and quality of literature supporting the incidence of IPJA after AA and TAR. Methods: A comprehensive review was performed to determine the quantity and quality of literature supporting the incidence of IPJA after AA and TAR. After applying inclusion and exclusion criteria, 23 TAR and 19 AA studies were included. Results: Only one high-quality level I was found, reporting 1.2% of IPJA after TAR. Majority of the studies were level IV and reported an incidence of subtalar arthritis of 0%-40%, talonavicular 2.8%-34%, and calcaneocuboid 2.8%-3.2% after TAR and an incidence of subtalar arthritis of 7.7%-100%, talonavicular 8.69%-11.6%, and calcaneocuboid of 22% after AA. Conclusion: There is currently poor quality evidence supporting a higher rate of IPJA after AA compared to TAR. Also there is poorquality evidence that supports IPJA as a complication of TAR; however, this is the current evidence on this topic. Better-quality longterm studies are required to make definitive and accurate conclusions on the incidence of IPJA.Level of Evidence III; Therapeutic Studies; Systematic Review.
Classification of foot type from podography: correlation of results between six quantitative assessment methods
Authors: Filho Renato Guilherme Trede , Rodrigues Thamires Cristina Perdigão , Brant Alícia Correa , Rodrigues Nara Lourdes Moreno , Mazuquim Bruno Fles , Richard Jim
Published: May 2023

Objective: Apply the different methods available in the literature to classify a sample of podography and evaluate the level of agreement between the results. Methods: Six quantitative and one qualitative method to classify foot type from podography were recorded on 30 feet. The podography indexes were calculated, and the level of agreement between methods was explored. Results: Correlation values were above r = 0.84 except for the test arch footprint angle. The highest correlation values were found between the truncated arch index and footprint index (0.99), arch index and footprint index (-0.94), and arch index and truncated arch index (-0.94), and the lowest was the arch footprint angle with the other parameters. However, there was a difference in the classification between the foot types, indicating a lack of agreement of thresholds between foot types. Qualitative visual inspection was the faster method to classify foot type.Conclusion: The visual inspection was the fastest test to apply, followed by the quantitative arch footprint angle test. High correlation values were found between tests, especially the arch index and the footprint index, arch-length index, truncated arch index, and Chippaux-Smirak index tests. Level of Evidence IV; Therapeutic Studies; Case Series.
Macrodystrophia lipomatosa of the right foot: a case report and treatment
Authors: Das Joydeep
Published: May 2023

Macrodystrophia lipomatosa (MDL) is a rare congenital disorder characterized by localized gigantism of one or several digits. It mayinvolve the entire limb due to progressive overgrowth of all mesenchymal elements with an excessive increase in the fibro-adiposetissues. It occurs most commonly in the lower limbs. It comes to clinical attention for cosmetic reasons, mechanical problems secondaryto degenerative joint disease, or the development of neurovascular compression. We report a case of MDL of the right foot withdifficulty walking and wearing footwear. With a complete radio-clinical workup and history review, a provisional diagnosis of MDL wasmade, confirmed by histopathology and during surgery. Level of Evidence V; Therapeutic Studies; Expert Opinion.
HANKOICHNUS ICHNOGEN. NOV., A NEW ARTHROPOD (?) TRACE FOSSIL FROM THE CARBONIFEROUS OF THE DONETS BASIN (UKRAINE)
Authors: Dernov V.S.
Published: May 2023

The flyschoid sediments of the Dyakove Group (Serpukhovian–Bashkirian) are exposed in the central part of the Donets Basin (Luhansk and Donetsk regions of Ukraine and Rostov Region of Russia). These sediments are important for studying the history of geological development of the Dnipro-Donets Downwarp. In addition, the sediments of the Dyakove Group contain deposits of a number of mineral resources (gold, ores of silver, lead, zinc, etc.). Nevertheless, the paleontological features of the Dyakove Group are poorly understood. This paper describes the phyllocarid (?) resting trace Hankoichnus bandersnatchi ichnogen and ichnosp. nov. from the early Bashkirian part of the Dyakove Group. Trace fossils of phyllocarids are poorly studied. Diagnosis of a new ichnogenus: a small phyllocarid (?) resting trace (Cubichnia), represented by a hexagon bounded on both sides by ridges (in fact, by grooves, since the described material is a convex hyporelief on the lower surface of a shale slab), with one small tubercle at one end. The ichnogenus Hankoichnus differs significantly from other resting traces of arthropods (e.g., Alph, Arborichnus, Kingella, Rusophycus, Selenichnites, Tonganoxichnus, etc.). The new ichnogenus has the greatest similarity with the trace fossils Gluckstadtella Savage, 1971. The difference between Hankoichnus and Gluckstadtella consists in the absence of imprints of producer’s limbs in Hankoichnus. The most likely makers of traces Hankoichnus are phyllocarid crustaceans. This is confirmed by the morphology of the trace and the remains of the carapace valves of these crustaceans, found together with Hankoichnus in the black shales in the complete absence of remains of other biota. Phyllocarid remains are relatively common in Devonian and Carboniferous black shales formed in a dysaerobic marine environment.
”MINERALOGY OF IGNEOUS COMPLEXES OF WESTERN VOLYN” – THE FIRST FUNDAMENTAL MONOGRAPH ON REGIONAL MINERALOGY IN UKRAINE
Authors: Batsevych N.V. , Naumko I.M. , Fedoryshyn Yu.I.
Published: May 2023

The contribution of the authors of the monograph “Mineralogy of igneous complexes of Western Volyn”, headed by Academician Yevhen Kostiantynovych Lazarenko, to the mineralogy of igneous rocks of the region is highlighted. The results of a detailed geological and mineralogical study, a geological and petrographic essay and the characteristics of mineral formation processes of Archean metamorphic and Zhytomyr-Kirovohrad and Osnitsk intrusive as well as dyke-effusive igneous complexes are discussed. It is shown that the materials obtained by the authors of this first fundamental monograph on regional mineralogy of Ukraine, together with the full use of literature at the time, formed the basis for all subsequent studies of Western Volyn, given its prospects for identifying of copper fields within the Volyn series of the Lower Ediacaria flood continental basalts. The obtained results, together with а set of data obtained later, made it possible to justify the need to intensify targeted efforts in the region. In the future, special attention should be paid to continuing the detailed study of the geological structure, mineral composition, petrographic and petrochemical features of rock-ore complexes of Western Volyn, the fluid regime of mineralogenesis of copper-containing flood continental basalts. Further research in the region will contribute to detailing the conditions for the formation of native copper mineralization in traps of the Volyn series in the aspect of assessing their copper ore potential; their results should be used by production geological organizations to optimize prospecting and exploration work in the preparation of promising areas for exploration. The significance of Yevhen Lazarenko’s contribution to regional mineralogical research, which was initiated by the monograph “Mineralogy of igneous complexes of Western Volyn”, is growing under these conditions. The book is still a powerful source of inspiration for geologists who continue the work of an outstanding scientist in the field of Earth sciences and conduct regional mineralogical research not only in Volyn, but also in other regions of Ukraine.
PLACER DEPOSITS OF DIAMONDS AND THEIR FORMATION CONDITIONS
Authors: Pidvysotskyi V.T. , Ostafychuk N.M. , Bashinsky S.I.
Published: May 2023

This article reviews information from published papers and studies by the authors about placer diamond deposits. Original data were obtained in result of field and laboratory-analytical work carried out in various countries of Africa and South America. The main types of placer diamond deposits – fluvial, fluvioglacial, eolian, and man-made – have been considered and characterized. The main attention is given to fluvial continental placers, which are the most diverse, well-studied and have the greatest industrial importance. Primary, secondary and mixed deposits are distinguished according to the method of feeding; short, moderate and long transport deposits – according to the distance of the diamond-bearing material movement. It is noted that although the short transport placers (deluvial-proluvial and beds of short watercourses) have not industrial value, they are very informative for the searching for root sources. It is important to reliably diagnose these deposits by lithological-facies and mineralogical features during prospecting works. The concepts about the conditions for the formation of diamond placers in various landscape and geological conditions are developed and clarified. Alluvial-proluvial-lacustrine and proluvial-lacustrine types of placers studied in Yakutia and Brazil are characterized in detail. Their characteristic feature is that their productive strata, being re-deposited products of crustal weathering, themselves underwent a hypergenic change at the place of occurrence, which significantly masks the primary conditions of formation. Continental alluvial redeposition and long transport placers, as well as marine, yield the most high-quality expensive diamonds, the average value of which can reach $300–400 per carat. Often, such placers are formed due to the erosion of ancient Proterozoic placers, which belong to the category of fossils. The article summarizes the genetic and morphological types of diamond placers in the form of a principle diagram of the distribution of sedimentary reservoirs of kimberlite minerals. The landscape-dynamic zones of sedimentation are highlighted. A classification scheme of sedimentary reservoirs containing diamond placers has been developed. Continental, transitional and marine environments are distinguished, with further detalization of sedimentation environments – peneplain, alluvial-lacustrine accumulative plain, alluvial-deltaic plain and shelf zones of sea basins. It is shown that the formation of valley placers, their internal structure, thickness, granulometric composition and diamond content of alluvium are influenced by the dynamic phases of the formation of annual valleys. Visualization of the mutual relationship of different morpho-genetic types of placer diamond deposits is given.
Correlation processing of incoherent scattering signal using multichannel device
Authors: Emelyanov L.Ya. , Pulayev V.А. , Rogozhkin E.V.
Published: May 2023

A method of correlation processing and the appropriate structure of the updated correlator operating as a part of the incoherent scatter radar in real time are proposed. The use of additional correlation channels makes it possible to reduce the error in determining the autocorrelation functions of the incoherently scattered signal and, as a consequence, to improve the accuracy of ionosphere parameters measurement without degrading height and temporal resolutions.
Spatial integration of navigation data as efficient method to improve quality of vessel traffic services support
Authors: Kravchenko O.I. , Shcherbina K.A. , Msallam E.P. , Vonsovich M.A.
Published: May 2023

Practical need for the integration of navigation data received by spatially-dispersed network of coast navigation stations of vessels traffic service in coastal regions has been proved. Technical supportability, potential and conceptual peculiarities of the integrated processing implementation of the abovementioned navigation data have been outlined. Perspectives of effective implementation of various well-known conceptual approaches to the development of such systems have been compared and analyzed. The functional scheme of the working automated radio system with a multi radar data processing subsystem has been developed. Its accuracy has been analyzed. The method has been offered and the experimental studies results have been cited to prove the effectiveness of the navigation data integrated processing to support the theoretical expectations. The presented data show that the current integral of the error parameter is considered to have minimal fluctuations, and the standard error shall not exceed the corresponding errors of each of the partial channels.
Ensuring stability of radar field when creating hydrometeorological monitoring system
Authors: Perelygin B.V.
Published: May 2023

Based on the model of the radar field formed by a group of meteorological radars, the radar field characteristics are calculated for different radar location variants based on a geometric approach. A failure of a part of the radar is simulated for each of the field construction variants and the degree of stability of the continuous radar field is quantitatively assessed upon the failure of a part of the radar. Recommendations are given on the construction of a systematically stable radar field.
Acoustic method for measuring turbulent state of the atmospheric boundary layer
Authors: Sidorov G. , Sheiko S. , Shapovalov S. , Polonska A. , Dmytrenko A.I.
Published: May 2023

A model for acoustic waves scattering by turbulent inhomogeneities in the atmospheric boundary layer is proposed and theoretically justified. The requirements for the equipment for experimental studies are given and analysis of the experimental data obtained by an acoustic locator of NURE meeting the requirements is performed. The adequacy of the theoretical model of acoustic waves scattering by turbulent inhomogeneities in the atmosphere and the possibility of classifying the state of turbulence based on the results of measurements of the envelope of echo signals have been proved experimentally.
Two level routing method with priority link resource allocation balancing in software defined telecommunication network
Authors: Lemeshko O.V. , Nevzorova O.S.
Published: May 2023

Two-level routing method with priority link resource allocation balancing in software defined telecommunication network is proposed. The proposed method is based on the use of a flow-based mathematical model, which allowed providing a coherent solution of routing and link bandwidth allocation. On the other hand, the basis of the proposed method is the interaction prediction principle of the theory of hierarchical multi-level control system, which allowed the introduction of a two-level hierarchy of calculations: the lower level was responsible for calculating routing variables, and the upper level was responsible for the link resource allocation. The numerical example confirms the correspondence of the method to optimal solutions for the finite number of iterations. Also, due to the use of the interaction prediction principle, the solution of the problem of recalculating routes and the order of link resource allocation can be completed on an arbitrary iteration, and the resulting solution will be permissible and meet all the conditions and limitations.
Features of organization of backhaul backbone network based on LTE technology
Authors: Tokar L.A. , Tokar D.I.
Published: May 2023

The questions of organization of backhaul backbone network using LTE technology are considered. The model of a backhaul network using multiprotocol label switching technology is proposed to form the transport basis for existing networks. The transport performance of the network was estimated.
Transformation of the airy pulse at temporary jump of the dielectric permittivity of the medium
Authors: Nerukh A.G. , Kuryzheva O.V.
Published: May 2023

The spatio-temporal problem of interaction of the Airy electromagnetic pulse and a plane dielectric layer is solved in the case of a permittivity sharp change in a layer at zero moment of time.  Expressions for the field inside the layer are obtained and the influence of the starting parameter on the position of the pulse inside the layer is shown. The evolution of the pulse in media with different refractive index is analyzed. A comparative analysis of the interaction of the Airy pulse with a plane layer between two dielectric media with a dielectric layer is carried out. The influence of pulse reflections from the layer boundaries on its shape and location is analyzed. From the analysis of the obtained results it follows that the choice of the initial space-time parameter affects the location of the pulse in the layer, and the transition of the signal to a medium with a larger (lower) permittivity results in the amplitude increase of oscillations and the main lobe shape change.
Physical and mathematical foundations of measurements in nonlinear dynamical systems
Authors: Machekhin Yu.P. , Kurskoy Yu.S., , Gnatenko A.S.
Published: May 2023

Physical and mathematical bases of measurements in physical non-linear dynamical systems are formulated. Physical properties, common to different systems, include: interval physical values; different modes of dynamics (including chaotic); strong dependence on the initial conditions; exposure to noise. We have used mathematical tools and methods of the dynamic chaos theory, open systems theory, fractal analysis: intervals of quantities values, fractal dimension, predictability time, model equation and others. New results and models are important for creating lasers with high stabilization of characteristics and practical application of solitons.
Optimization of thermal regime of continuous CO2-lasers with diffusion cooling
Authors: Vasyanovich A.V. , Gnatenko A.S. , Pustyl'nikov D.V.
Published: May 2023

Mathematical methods for optimizing parameters of the CO2 laser, realized using numerical computer simulation, are proposed. The results of numerical calculations coincide with the results of the experimental data, at a partial discrepancy, the reasons associated with the non-optimal consideration of the proposed recombination model on the wall of the O-tube in the reaction O+OW -> O2were established. The results of the work can be fully used to optimize various designs of continuous CO2 lasers.
Model of security threats for wireless communication systems in millimeter wave range
Authors: Salnykov D. , Tsopa O.
Published: May 2023

The article is devoted to the problem of using the next generation 5G, mil-lime waves (MM DV) in wireless communication systems. Possessing a high directivity and being susceptible to blocking by environmental objects, MM channels are often considered difficult to intercept by an intruder. The purpose of the work is to develop a threat model for the MM DL channel and to assess the security of the wireless data transmission system with the OC. A common threat model for evaluating the security parameters of information transmission systems at the physical level using a millimeter wave band (MM DV) is obtained.
General statements and analysis of the end-to-end encryption algorithm NTRU Prime IIT Ukraine
Authors: Gorbenko I.D. , Kachko O.G. , Yesina M.V.
Published: May 2023

The NTRU-like cryptosystem NTRU Prime IIT Ukraine, created on the basis of existing cryptographic transformations end-to-end encryption type, is considered. The description of this cryptosystem is given and its analysis is carried out. Also, features of its implementation, comparison of the main characteristics and indicators, as well as the definition of differences from existing NTRU-like cryptographic algorithms are presented. Conclusions are made and recommendations are given.
Side-channel attacks analisys against NTRU-similar algorithm
Authors: Kachko O.G. , Gorbenko Yu.I. , Akolzina O.S.
Published: May 2023

The results of NTRU-similar algorithm analysis with respect to resistance against side-channel attacks are given. Proposals of defending these attacks are given. The evaluations of how many keys will be reduced with key space limitations of key data (which are needed to ensure the properties of random sequences) are made.
Primary analysis and research on code-based schemes of electronic digital signature and public-key cryptosystems from NIST PQC
Authors: Kiian A.S. , Lutsenko M.S. , Kuznetsov A.A.
Published: May 2023

The code-based schemes of electronic digital signature and public-key cryptosystems, submitted to the contest of post-quantum cryptoalgorithms NIST PQC are considered. The general characteristics of the algorithms are give and basic properties and parameters are estimated. The comparative analysis of the electronic digital schemes and public-key cryptosystems is carried out according to the criteria of speed and length of the main cryptographic parameters.
Analysis and comparative studies of code-based key encapsulation mechanisms submitted to the NIST PQC competition
Authors: Lutsenko M.S. , Kiian A.S. , Kuznetsova T.Y. , Kuznetsov A.A.
Published: May 2023

The error correcting code-based key encapsulation mechanisms, presented to the NIST PQC competition, are investigated. The results of the primary comparative analysis of the cryptographic properties and the performance indicators of the key encapsulation schemes are presented.
Investigation of cross-platform realizations of stream symmetric ciphers
Authors: Kuznetsov A.A. , Frolenko V.O. , Eremin E.S. , Ivanenko D.V.
Published: May 2023

Modern symmetric stream ciphers Enocoro, Decim, Grain, HC, MUGI, Mickey, Rabbit, RC-4, Salsa20, SNOW2.0, Sosemanuk, Strumok, Trivium, and a block cipher AES, which can be used in streaming encryption modes, are being researched. The main results of testing the rate of formation of a key stream with cross-platform implementation of encryption algorithms in the Java programming language on operating systems Windows 10 (x64), Debian (Kali) and Android (x64) are presented. Testing was conducted on the portable personal computer (Intel Pentium 3550m 2.3GHz, RAM 4GB (1600МHz)) and on the mobile device, in particular, on the smartphone (Samsung galaxy S7).
Probabilistic model of fingerprint images of computer biometric authentication
Authors: Shlokin V.M. , Rasomakhin S.G.
Published: May 2023

Methods of computer biometric authentication are analyzed. Peculiarities of the identification process of fingerprints characteristic features are investigated. A probabilistic model of fingerprint images is proposed. The nature and sources of errors in the processing of imaging portraits under the conditions of distorting influences are grounded. The descriptions and characteristics of error distributions are obtained.
Method for measuring quantum phase noise and working transition line width of radio-optical system of random number generator
Authors: Nariezhnii O.P. , Semenets V.V. , Grinenko T.O.
Published: May 2023

Results of comprehensive theoretical and experimental studies on creation of a Quantum Random Number Generator (QRNG) prototype based on the implementation of double radio optical resonance in the vapor of the rubidium isotope are presented. A method is developed for the analytical and numerical solution of the coupled-mode QRNG equation, which describes the mode of interaction of quantum generators in the process of measuring their parameters. A feature of the proposed method is the possibility of studying quantum phase noise and the width of the quantum discriminators line on alkali metal vapors in the presence of an interaction error.
Database schema invariant to subject domains and its distinctive features
Authors: Yesin V.I.
Published: May 2023

The desire to avoid unnecessary costs inherent in the traditional methodology of creating relational databases, not only at the stages of conceptual and logical design, but also at the stage of physical design, has actualized the task of developing a database schema that is invariant to subject domains. The main developed and distinguishing elements of this scheme are as follows: composition, structure of the basic relations; implementation of integrity constraints; means ensuring the database security.
Examples of determining the rank of a number represented in the non-position system of residual classes
Authors: Krasnobayev V.A. , Zamula A.A. , Yanko A.S.
Published: May 2023

Possible methods are considered for determining the positional feature of the non-position code (PFNC) of the number system in residual classes (SRC) of the rank of a number. Two methods for determining the rank of a number in a SRC are presented. The main attention is paid to the method of determining the rank of a number based on using the result of the proof of the theorem on the rank of the sum of two numbers. Examples of a specific definition of the rank of a number are given.
Data hiding in the FAT family file system structure
Authors: Shekhanin K.Yu. , Kolhatin A.O. , Demenko E.E. , Kuznetsov A.A.
Published: May 2023

Methods of technical steganography, namely, those ones based on information messages hiding in the structure of the FAT family file system are studied. The basic method based on changing the numbering of cover files clusters is considered, its advantages and disadvantages are researched. An improved method is proposed that makes it possible to increase significantly the hidden data size. The results of the comparative analysis of hiding data in the structure of the FAT family file system are given.
Determination of refractive index of air along the ray based on the effect of absorption line broadening of air molecules
Authors: Remayeva O.A. , Sokolinskyi K.A.
Published: May 2023

Due to the large-scale use of GPS technology, the accuracy of determining the location of the object under investigation is of high importance. The effect of absorption of the basic molecules of air on the value of refractive index was examined. Based on these studies a method was developed for determining the magnitude of the average integral refractive index of air, and the errors in the method were investigated. The method for determining the integral average value of air refractive index is developed on the basis of these investigations. The accuracy of the method was studied.
Principles of measurement modeling in optical nonlinear dynamical systems
Authors: Machekhin Yu.P. , Kurskoy Yu.S. , Gnatenko A.S.
Published: May 2023

The task of the paper consists in a creating the principles for measurement modeling in optical nonlinear dynamical systems (lasers, solitons, optical cryptography systems). The measurement model of such systems should contain: the input values, their time and noise dependencies, measurement uncertainties of input quantities and initial conditions, evolution function and forecasting time. It is suggested to use the measurement portrait for the case when the mathematical description of the systems is impossible. Analysis of measurement portrait allows us to calculate the fractal dimension, dynamics of the dynamic variables and the relationship of their values without knowledge of the analytical solutions of the system equations. Bifurcation points and Lyapunov exponents, the forecast time of the dynamics and other quantities can be calculated too. The principles of modeling the measurement process, proposed by the authors, provide theoretical, model and experimental studies of physical phenomena in the optical nonlinear dynamical systems, facilitate the solution of a wide range of problems with creation and management of optical systems, and study the processes of self-organization and dynamics in such systems.
Ways of upgrading optical-electronic reconnaissance and aiming weapons and military equipment
Authors: Kondrat V. , Kostenko O. , Kutsenko V.
Published: May 2023

A comparative analysis of existing and prospective (modernized) optical-electronic means of night and day vision is carried out. The ways of their modernization are proposed in order to create an integrated automatic decision-making system for the destruction of targets for weapons and military equipment samples of the National Guard of Ukraine.
Verification of the hexagonal communication grid by infinite Petri nets
Authors: Shmeleva T.R.
Published: May 2023

A formal direct parametric description of the hexagonal grid model with side k is constructed according to the specified grid composition rules. A system of linear equations is constructed for finding invariants of positions on the basis of a direct description of the model. A method for calculating linear invariants of infinite Petri nets with a regular structure for an open hexagonal grid is used, and a solution of a system of linear equations in parametric form is obtained. It is proved that the hexagonal grid model, represented in the form of infinite Petri net, is a p-invariant Petri net for an arbitrary natural number k and has the boundedness and conservativeness properties. Communication grids, representing the implementation of the studied model, can be constructed using devices with limited capacity without overflow.
The steganoanalytical method for revealing a hidden communication channel with low capacity
Authors: Bobok I.I.
Published: May 2023

Two stegano-analytical methods, CM1 and CM2, were developed. The basis of these methods is a new general approach to the problem of detecting integrity violations of digital images, which uses the properties of singular numbers and singular vectors of blocks of the image matrix. The proposed methods serve to identify the steganographic communication channel, formed by the Least Significant Bit method. A digital image in lossy format is used as a container. The methods CM1 and CM2 are effective for small values (less than 0.1 bit/pixel) of the latency channel capacity (LCC). Algorithms that implement methods are polynomial. Errors of the first kind are 1.7 and 1.3%, respectively, the errors of the second kind do not exceed 4% (LCC 0.01 bit/pixel). Existing modern analogues in conditions of such a small latency channel capacity do not work.
Analysis of the spatial structure of meteor showers and associations of the KNURE catalog
Authors: Sakhno D.G. , Ivanova O.O. , Gorelov D.Y.
Published: May 2023

The algorithm is proposed for calculating the density of a meteor streams in the standard perihelion of its average orbit – a numerical criterion by which dust-forming properties of meteor streams can be compared. It is shown that the most powerful meteor streams are characterized by the values of the large semi-axes a≈1 a.e., perihelion distances of 0.4 <q <0.8 a.e. and eccentricities e> 0.8. The meteor streams are detected, whose density exceeds the density of such a powerful stream as GEMINIDS (according to density in the standard perihelion of its average orbit).
Adaptive method with noise- and signal-dependent switching of filters for suppression of non-stationary noise in an electrocardiogram signal in real time
Authors: Tulyakova N.O. , Trofymchuk O.M. , Stryzhak O.Ye.
Published: May 2023

А new method for suppressing non-stationary noise in an electrocardiogram (ECG) in real time with a noise- and signal-dependent switching of filter with the most suitable processing of local signal segment is proposed. Adaptive algorithms are designed on the basis of this method. Statistical estimates of efficiency are obtained using such criteria as mean-square error, maximum absolute deviation, and signal-to-noise ratio for a model of ECG signal sampled at 1 kHz under conditions of different levels of additive Gaussian noise. It is shown that, with a very low noise level, the proposed algorithms do not distort the QRS-complex, and with a middle and high noise level, they provide a high degree of its suppression. In comparison with the modern dynamic algorithm of filtering of electromyographic (EMG) noise in an ECG, the proposed adaptive filters have an advantage in efficiency and smaller processing delay. Good quality of suppression of different levels of EMG noise in the ECG signal is demonstrated.
Investigation of the effect of magnetic field and ultrasound on biological systems
Authors: Bondarenko I.S. , Bogdan O.N.
Published: May 2023

The use of ultrasound (US) and magnetic field (MP) occupies an important place in biomagnetic technologies. Data on the use in medicine of one of the little-known in the literature methods of sharing US and permanent MP are presented. The results of such use are described. The analysis of new approaches for studying the properties of the biological environment and their application for solving the problem of drug directional transport is performed.
Features of formation of information signals of resonant measuring converters with aperture and probe sensing elements
Authors: Bondarenko I.N. , Ю.С. Васильев
Published: May 2023

The effect of changing the interaction conditions of the aperture or probe sensitive elements of resonant measurement converters (RMC) with the objects of investigation on the process of formation of basic information signals is analyzed. The obtained experimental results allow us to state that the analytical relationships used to describe the influence of the parameters of the investigated objects on the quality factor and the resonance frequency of the RMC and a priori assume the invariability of its connection with the measuring system are not observed in practice.
relações público-privado na educação em tempos de pandemia do COVID-19: um olhar freireano
Authors: Kin Slodkowski Bruna , Poliana Becker Taila , Alejandra Behar Patricia
Published: May 2023

O neoliberalismo se constitui como uma ideologia caracterizada por um conjunto de ideias políticas e econômicas capitalistas que visam estimular o desenvolvimento econômico, sobretudo, sem a intervenção do Estado. No âmbito educacional, esse processo ocorre de modo sutil no qual a escola é compreendida na lógica de mercado. Além disso, a partir de 2019 o cenário mundial foi demarcado pela pandemia do coronavírus (COVID-19) que impactou as esferas econômicas, sociais, políticas e, sobretudo, a educação. Assim, este artigo tem como objetivo identificar e analisar a influência da relação público-privado no contexto educacional pandêmico a partir do viés teórico subsidiado em Paulo Freire. Desse modo, é utilizada como metodologia a pesquisa de revisão sistemática da literatura. Foram analisados 79 artigos sobre a temática sendo que somente 3 passaram pelos critérios de qualidade. Portanto, observou-se que em ambos artigos estava presente as relações público-privadas na educação brasileira balizadas nas desigualdades sociais e mercantilização da educação que se intensificaram com o período pandêmico haja visto que já existiam e estavam à serviço das agendas empresariais.