bluuebunny/crossref_metadata_2025 huggingface dataset:
L' emploi de ressources technologiques complémentaires auprès d’élèves de la maternelle 5 ans pour contrer la distance et s’adapter au contexte de la pandémie
Authors: Pépin Audrey , Imbeau Karine
Published: November 2021

Cet article présente différentes plateformes éducatives ainsi qu’une application et un réseau social qu’une enseignante en éducation préscolaire (maternelle 5 ans) a utilisés pour soutenir l’apprentissage de ses élèves et favoriser la communication entre les différentes actrices et acteurs du milieu scolaire en temps de COVID-19, où les manières conventionnelles d’enseigner et d’entrer en contact avec les actrices et les acteurs du milieu ont été bouleversées. L’article décrit la façon innovante dont ces ressources technologiques ont été combinées de manière à se compléter et la façon dont elles ont été intégrées dans la classe. L’article présente également les leviers à la réussite et les défis à relever lors de l'intégration de ces ressources ainsi que des conseils pour toutes celles et ceux qui voudraient les intégrer dans leur classe.
L’enseignement de l’éducation physique en formule hybride : l’expérience d’un enseignant au secondaire
Authors: St-Pierre Émilie , Julien Gabriel
Published: November 2021

La pandémie de Covid-19 a forcé plusieurs professionnels à revoir leur pratique. Le monde de l’éducation ne s’est pas vu épargné par cette crise alors que des milliers d’écoles à travers le monde ont été fermées (OCDE, 2020), forçant ainsi les enseignants à adapter leur enseignement afin de dispenser leur cours à distance. Cet article présente le point de vue de monsieur Gabriel Julien, enseignant en éducation physique et à la santé, relativement à sa pratique enseignante en temps de pandémie et à l’intégration d’outils et d’applications technologiques diversifiées dans sa pratique.
Modeling landfill CH4 emissions
Authors: Spokas K.A. , Bogner J. , Corcoran M.
Published: November 2021

The current IPCC landfill methane (CH4) methodology excludes critical process drivers now known to control emissions. These include site-specific (1) operational factors (i.e., thickness and composition of various cover soils; physical extent of engineered biogas recovery) and (2) temporal climate effects on soil moisture/temperature profiles in each cover which, in turn, drive gaseous transport, microbial methanotrophic oxidation, and temporally variable “net” CH4 emissions over an annual cycle. Herein, we address the international field validation and application of a process-based model CAlifornia Landfill Methane Inventory Model (CALMIM) which encompasses site-specific climate, cover soils, engineered biogas recovery, and other site-specific strategies. Using embedded soil microclimate models with (a) default 30-year climate data, (b) site-specific annual weather data, or (c) future climate predictions (i.e., CMIP5), the transient soil moisture and temperature effects on bidirectional diffusive CH4/oxygen transport and microbial oxidation can be estimated for any cover soil at any global location. We focus on site-specific field data comparisons to CALMIM-predicted annual and monthly CH4 emissions both without and without methanotrophic oxidation. Overall, 74% of 168 individual surface CH4 emission measurements across 34 international sites were consistent with CALMIM-modeled annual predictions with oxidation (+ or – SD). Notably, the model overpredicted 30 comparisons and underpredicted 13 comparisons. In addition to improving site-specific landfill CH4 inventories, we address how this freely available tool can be used to (a) recommend site-specific cover soil modifications to minimize emissions; (b) systematically compare the spatial and temporal variability of emissions for diverse global locations, latitudinal gradients, extreme climates, and future climate scenarios; (c) assist scheduling of field campaigns to capture seasonal variability; and (d) provide a 12-month annual framework with average monthly CH4 emission statistics for comparison to periodic temporal results from diverse bottom-up and top-down field techniques with variable uncertainties. Importantly, CALMIM does not require intensive site-specific model calibrations.
Using Memes to Carve a Space for Undocumented Latino/a Visibility and to Tackle Fossilized Myths
Authors: Thomas Kaitlin E.
Published: November 2021

This article considers the impact of memes shared among Millennial and Generation Z–oriented Latino/a social media outlets during the years 2014–17, and proposes reading memes as viable microliterary texts. Through the examination of many dozens of memes and hundreds of Facebook posts from the nonprofit organization UndocuMedia, I have identified two themes that reoccur with notable frequency: (in)visibility and knowledge. As expressed within the memetic platform, these themes have cultural functions beyond superficial banter: humor detracts from political absurdity, arguing points permits one to assume defensive and protective postures, and connecting with friends expands the network of allies. I first define memes and explain how they might be read as socially conscious microliterary texts. I then examine selected meme examples to illustrate how they are shared with the intent to challenge the social and political marginalization that has long plagued the undocumented Latino/a demographic in the United States and to debunk long–held fossilized myths. I conclude by discussing the role of accompanying hashtags and emoji in the process of transplanting online activism to the offline world.
Maya Blue and Franciscan Evangelism
Authors: Solari Amara , Williams Linda K.
Published: November 2021

In the first decades of the Franciscan evangelical campaign in Yucatán, Mexico (1540–90), Maya builders and artists directed the construction and pictorial decoration of hundreds of Christian edifices, ranging from small-scale chapels to larger churches and entire monastic complexes, offering a material record of the peninsula’s religious transformation. Strategic color selection and the deployment of Maya blue pigment in particular architectural, iconographic, and liturgical contexts enabled Indigenous catechumens to reconcile post-Tridentine conceptions of divinity with precontact sacred ideologies. By weaving diverse methodologies from the study of visual sources, textual documents, and material characterization techniques, we demonstrate how colonial Maya color theory actively engineered localized Catholicism.
Non-cell autonomous mechanisms control mitochondrial gene dysregulation in polycystic ovary syndrome
Authors: Moreno-Asso Alba , Altıntaş Ali , McIlvenna Luke C , Patten Rhiannon K , Botella Javier , McAinch Andrew J , Rodgers Raymond J , Barrès Romain , Stepto Nigel K
Published: November 2021

Polycystic ovary syndrome (PCOS) is a common endocrine disorder associated with insulin resistance and impaired energy metabolism in skeletal muscle, the aetiology of which is currently unclear. Here, we mapped the gene expression profile of skeletal muscle from women with PCOS and determined if cultured primary myotubes retain the gene expression signature of PCOS in vivo. Transcriptomic analysis of vastus lateralis biopsies collected from PCOS women showed lower expression of genes associated with mitochondrial function, while the expression of genes associated with the extracellular matrix was higher compared to controls. Altered skeletal muscle mRNA expression of mitochondrial-associated genes in PCOS was associated with lower protein expression of mitochondrial complex II–V, but not complex I, with no difference in mitochondrial DNA content. Transcriptomic analysis of primary myotube cultures established from biopsies did not display any differentially expressed genes between controls and PCOS. Comparison of gene expression profiles in skeletal muscle biopsies and primary myotube cultures showed lower expression of mitochondrial and energy metabolism-related genes in vitro, irrespective of the group. Together, our results show that the altered mitochondrial-associated gene expression in skeletal muscle in PCOS is not preserved in cultured myotubes, indicating that the in vivo extracellular milieu, rather than genetic or epigenetic factors, may drive this alteration. Dysregulation of mitochondrial-associated genes in skeletal muscle by extracellular factors may contribute to the impaired energy metabolism associated with PCOS.
A Mixed Study on the Effectiveness of Verbal Praise in Primary School Class
Authors: Zhang Shiyuan , Du Xinrong , Deng Jie
Published: November 2021

Verbal praise is frequently used as motivation by teachers in class and truly effective verbal praise plays an important role in maintaining classroom order and stimulating positive student behavior. In this study,  students from three classes of X Primary School of Jiangxi Province were interviewed and 328 verbal praise expressions collected. The subsequent empirical study on the effectiveness of verbal praise in four dimensions,  namely content,  spatiality,  subjectivity and time,  found that verbal praise generates both shallow and deep effects. The shallow effects act as a foundation for deep effects but do not necessarily result in deep effects. Other conditions are required to actualize a deep effect.
Left ventricular outflow tract obstruction after transcatheter mitral valve replacement: the importance of preprocedural planning and prevention
Authors: Abdulbasit Muhammad
Published: November 2021

Given the prevalence of mitral valve pathology in high-risk patients, transcatheter mitral valve replacement (TMVR) is becoming an attractive treatment modality. A known complication of TMVR is left ventricular outflow tract obstruction (LVOT) due to the prosthetic mitral valve and native anterior mitral valve leaflet encroaching into the LVOT. This is a serious complication which can lead to decreased cardiac output and death. Preprocedural planning with various imaging modalities (multi-detector cardiac CT and echocardiography) can predict those at high risk of LVOT obstruct. To increase awareness and to prevent this complication from occurring in the future, we present a case of LVOT obstruction after TMVR.
Propanolol as a treatment for deep infantile hemangioma: case report
Authors: Víctor Manuel Vargas Hernández , Estuardo Luján-Irastorza Jesús , Carlos Durand-Montaño , Daniela Ávila-Rebollar , Felipe de Jesús Ávila-Pérez , Monica Stephanie Loof-Esquivel , Alejandro Kava-Braverman , Roberto Hernández-Ramos
Published: November 2021

Background: Infantile hemangiomas (IH) are common neoplasms composed of proliferating endothelial cells. The duration and the growth rate are variable; some grow very poorly, while others grow rapidly and at an unpredictable rate. Despite the relative frequency of IH and the possible severity of complications, there are currently no uniform treatment guidelines. Although most are not worrisome, about 12% of IHs are significantly complex; propranolol has been adopted as a treatment. Objective: Report a clinical case of lactanate with hemangioma treated with propranolol. Case report: A healthy newborn is presented, with the presence of small telangiectasias in the right hemicneck without association with obstetric trauma; of a healthy 31-year-old mother; During its evolution at 3 months of age, the area covered with telangiectasias turned deep blue and the growth of a protrusion began, ultrasound and angioresonance, showed soft tissues of the posterior cervical space a lobulated mass of 9.1x4.1x4.9cm in its longitudinal and transverse diameter respectively, diagnosing it as a deep hemangioma; which was treated with propanolol. Discussion: Asymptomatic newborns with infantile neck hemangiomas are clinically controlled for the first six months of life, 60% of them develop life-threatening airway symptoms; the identification of the hemangioma was due to its rapid growth and not due to the alteration of surrounding structures that put the well-being of the infant at risk. Regarding the application of Propranolol, its administration was immediately after its identification, to avoid future complications. Conclusion: administration of propranolol systemically eliminates the characteristic color and reduces the size of the hemangioma.
Choriocarcinoma (stage IV) despite two normal dilation and curettages: A case report
Authors: Morshedi Bijan , Haworth Laura , Ito Traci
Published: November 2021

Choriocarcinoma is a highly metastatic subtype of gestational trophoblastic neoplasia (GTN) following pregnancy. It can arise from any type of pregnancy (50% occur after term pregnancies, 25% after molar pregnancies, and 25% after early pregnancy loss and ectopic pregnancies) (Soper, 2006). This case report describes an interesting diagnostic conundrum with normal histology findings on two separate endometrial dilation and curettages (D&C) and a unilateral oophorectomy in the context of high clinical suspicion for molar pregnancy that progressed to stage IV choriocarcinoma with brain and lung metastasis. The patient presented to our hospital nearly aphasic but would only say “molar pregnancy”. Due to her brain metastasis and worsening intraparenchymal hematoma, she underwent craniotomy confirming the diagnosis. After stabilization, she was transferred to a quaternary care center to complete chemotherapy with etoposide, methotrexate, actinomycin, cyclophosphamide, and vincristine and had a good response. At this time, there is no clear explanation for normal histology on two separate D&Cs and a unilateral oophorectomy in the context of a classic case of choriocarcinoma with progression from a molar pregnancy. It reminds us as providers that medicine remains an imperfect science and requires astute clinical judgement to properly treat patients when diagnostic data such as pathology findings and lab values appear to be incongruent with the larger clinical picture.
Audit of maternal deaths at the Saint Louis regional hospital from 2017 to 2019
Authors: Thiam Ousmane , Niang Khadim , Sow Djibryl Bahaid , Sarr Cherif Cheikh Tourade , Diouf Aliou , Idoko Patrick , Gueye Mamour , Ndiaye Papa , Ndiaye Seynabou , Mbaye Magatte
Published: November 2021

Objective: To audit maternal deaths at the regional hospital center of Saint-Louis. Materials and methods: This was a retrospective cross-sectional study of all maternal deaths that occurred between January 1, 2017 and December 31, 2019 at the Saint-Louis regional hospital center. Data were entered on EXCEL 2013 software. Analysis was performed on Epi Info version 3 software. Results: During our study, 73 cases of maternal death were collected. Maternal mortality was 520 per 100 000 live births. The mean age of the patients was 28.1 years±6.8. Multiparous women accounted for 43.8% and nulliparous women for 1.3%. The causes of maternal death were obstetric hemorrhage (28.77%), hypertension and its complications (20.55%), labour dystocia (15.07%) and anemia (6.85%). Direct obstetric causes of death were responsible for 64.38% of cases and indirect obstetric causes were seen in 35.62%. Death occurred postpartum in 68% of cases, during pregnancy in 25% and during labor in 7%. Death was preventable in 77.5% of cases. Conclusion: Maternal mortality is a real health problem in our practice. It affects young women. Indirect causes of death are becoming more significant causes of death in our practice. Maternal mortality is avoidable in the majority of cases.
PREVENTION AND SCREENING FOR COVID 19 INFECTIOUS DISEASE IN THE CONDITIONS OF GENERAL PRACTICE
Authors: Alekova S.
Published: November 2021

SARS-CoV-2 is the name of a new strain of coronavirus that was first reported in Wuhan City, the Chinese province of Hubei, in the middle of December 2019. The new viral disease has spread at an alarming rate worldwide, despite extreme anti-epidemic measures and strategies taken by many countries to limit the pandemic. Various activities of active and passive screening in the General practice have implemented to constrain the transamination of coronavirus infection. They involve a series of actions for informing and education of patients, early identification of suspected cases and management of patient with viral infection. To date, there is no approved vaccine or specific antiviral treatment available for COVID- 19. Further research is needed to understand in detail the life cycle of SARS-CoV-2, to detect the original source of the virus, to establish the mechanisms of transmission, as well as to develop effective methods for prevention of the onset of an infectious process and adequate treatment. It is necessary to be presented reliable scientific evidence that will contribute to more effective and quality screening in the General Practice. In this moment, all protective measures in the General medicine's office need to be focused on providing better protection for healthcare professionals and patients.
MiR-224 ameliorates inflammation and symptoms in mouse model of allergic rhinitis by targeting CDK9
Authors: Wang Sang , Wang Lei , Hu Hua , Dong Pin
Published: November 2021

Objectives To explore the regulatory effects of microRNA (miRNA)-224 and its potential target gene, cyclin dependent kinase 9 (CDK9), in the pathological process of allergic rhinitis (AR).
Methods To investigate the role of miR-224 and CDK9, it was screened by bioinformatics prediction software and verified by dual-luciferase reporter assay. The mouse model of AR was established by ovalbumin (OVA).The animal models were intervened with miR-224 agomir, negative control agomir, and saline respectively. The symptoms of sneezing and nasal rubbing were recorded. The expressions of miR224, CDK9, and cytokines in the nasal mucosa of different groups were analyzed by rt-PCR or western blotting. Enzyme-linked immunoassay (ELISA) was used to evaluate the levels of IgE and Histamine (HA) in the serum. The infiltration of inflammatory cells in the nasal mucosa was studied by immunohistochemistry. The expression and distribution of CDK9 in the nasal mucosa of mice were revealed by immunofluorescence.
Results In the nasal mucosa of the animal models, the level of miR-224 was downregulated, while that of CDK9 was upregulated. The upregulation of miR-224 by miR-224 agomir reduced the frequencies of nasal rubbing and sneezing, the expression of CDK9, the levels of cytokines, and the concentrations of IgE and HA. Moreover, miR-224 appeared to attenuate the infiltration of inflammatory cells and hypersecretion of glands in the nasal mucosa. The expression of CDK9, which was distributed under the mucosa, especially in the submucosa interstitial tissue, was significantly reduced.
Conclusion MiR-224 affected the pathogenesis of AR by targeting CDK9. It proves that miR-224 could be a novel potential therapeutic target for AR.
Bruceine D ameliorates the balance of Th1/Th2 in a mouse model of ovalbumin-induced allergic asthma via inhibiting the NOTCH pathway
Authors: Nie Ying , Yang Bangkun , Hu Junfeng , Zhang Lingling , Ma Zhimin
Published: November 2021

Allergic asthma is a heterogeneous inflammatory disorder triggered by inhaled allergens, leading to airflow obstruction, bronchial inflammation, and airway hyperresponsiveness (AHR). T helper (Th) 2 cell-mediated immune response and airway inflammation are the key features of allergic asthma. Bruceine D (BD) is a bioactive compound extracted from the seeds of Brucea javanica. The present study aimed to investigate the effects of increased doses of BD on AHR, secretion of Th1-/Th2-associated cytokines, and inflammatory cell infiltration in ovalbumin (OVA)-induced allergic asthma mice. The results showed that BD reduced OVA-induced inflammatory cell infiltration and bronchial hyperresponsiveness into the peribronchial tissues and perivascular areas. Mice treated with BD also showed significantly decreased expressions of Th2-associated cytokines (i.e., interleukin (IL)-4, IL-5, and IL-13) and elevated production of Th1-associated cytokines (i.e., interferon gamma and IL-2) following OVA stimulation. BD treatment dose-dependently inhibited OVA-induced accumulation of inflammatory cells in asthmatic mice. Further analysis revealed that OVA exposure upregulated pulmonary expressions of NOTCH signaling receptors, a group of transmembrane proteins that communicate signals upon binding to transmembrane ligands expressed on adjacent cells, while BD treatment significantly abolished OVA-induced activation of the NOTCH pathway. In conclusion, BD protected mice against OVA-induced allergic asthma by reducing AHR and restoring the Th1/Th2 balance through the NOTCH signaling pathway. Our findings highlighted the potential of BD as a therapeutic agent for allergic asthma.
Devising a method to control the operational quality and reliability of fiber-optical communication lines
Authors: Kiforuk Sergii
Published: November 2021

The lack of recommendations in the normative and technical documentation related to fiber-optic communication lines (FOCL) for assessing their technical condition necessitated devising a method to control the lines' quality and reliability of operation.
The method creates the basis for calculating the quality and reliability indicators of FOCL operation and suggests measures to improve them. It determines the methods of control, as well as the acquisition, accounting, and analysis of damage statistics with and without interruption of communication.
The graphic sequence of implementation of the stages of the method demonstrates that resolving the task to control these indicators should involve:
– managing the acquisition and actual acquisition of operational data on damages (the causes, nature, quantity, the duration of communication breakdown and complete elimination of damage);
– determining the quality and reliability indicators of FOCL operation annually;
– analysis of the obtained results and the development (correction) of measures to comply with the norms of these indicators;
– the implementation of measures to comply with the norms of quality and reliability of FOCL operation (if necessary).
Based on the operational data from a line operator acquired over three years in the specified climatic zone (a cable of the type OKLBg-3 DA12-3×4E-0.4F3.5/0.22N18-12/0), the methodical component of the method was examined.
The obtained results on the operational quality (damage density, average damage duration, break (downtime) of communication) and reliability indicators (FOCL readiness factor) of a subscriber access network without reservation showed that the line had low efficiency. The communication breakdown over three years amounted to K=12,569.8 stream∙hours. The downtime at this volume of digital stream∙hours has led to significant economic losses.
Line operators have been given recommendations for the proper FOCL operation and ensuring a normalized value of the line readiness coefficient. To this end, it is necessary to reduce the time to re-link and prolong the line's failure-free operation
Limiting COVID-19 infection by automatic remote face mask monitoring and detection using deep learning with IoT
Authors: Alsaydia Omar Mowaffak , Saadallah Noor Raad , Malallah Fahad Layth , AL-Adwany Maan A. S.
Published: November 2021

During the current outbreak of the COVID-19 pandemic, controlling and decreasing the possibilities of infections are massively required. One of the most important solutions is to use Artificial Intelligence (AI), which combines both fields of deep learning (DL) and the Internet of Things (IoT). The former one is responsible for detecting any face, which is not wearing a mask. Whereas, the latter is exploited to manage the control for the entire building or a public area such as bus, train station, or airport by connecting a Closed-Circuit Television (CCTV) camera to the room of management. The work is implemented using a Core-i5 CPU workstation attached with a Webcam. Then, MATLAB software is programmed to instruct both Arduino and NodeMCU (Micro-Controller Unit) for remote control as IoT. In terms of deep learning, a 15-layer convolutional neural network is exploited to train 1,376 image samples to generate a reference model to use for comparison. Before deep learning, preprocessing operations for both image enhancement and scaling are applied to each image sample. For the training and testing of the proposed system, the Simulated Masked Face Recognition Dataset ( SMFRD) has been exploited. This dataset is published online. Then, the proposed deep learning system has an average accuracy of up to 98.98 %, where 80 % of the dataset was used for training and 20 % of the samples are dedicated to testing the proposed intelligent system.
The IoT system is implemented using Arduino and NodeMCU_TX (for transmitter) and RX (for receiver) for the signal transferring through long distances. Several experiments have been conducted and showed that the results are reasonable and thus the model can be commercially applied
Grammatical categories determination for Turkish and Kazakh languages based on machine learning algorithms and fulfilling dictionaries of link grammar parser
Authors: Yerimbetova Aigerim , Tussupova Madina , Sambetbayeva Madina , Turdalyuly Mussa , Sakenov Bakzhan
Published: November 2021

This research is aimed at identifying the parts of speech for the Kazakh and Turkish languages in an information retrieval system. The proposed algorithms are based on machine learning techniques. In this paper, we consider the binary classification of words according to parts of speech. We decided to take the most popular machine learning algorithms. In this paper, the following approaches and well-known machine learning algorithms are studied and considered. We defined 7 dictionaries and tagged 135 million words in Kazakh and 9 dictionaries and 50 million words in the Turkish language.
The main problem considered in the paper is to create algorithms for the execution of dictionaries of the so-called Link Grammar Parser (LGP) system, in particular for the Kazakh and Turkish languages, using machine learning techniques.
The focus of the research is on the review and comparison of machine learning algorithms and methods that have accomplished results on various natural language processing tasks such as grammatical categories determination.
For the operation of the LGP system, a dictionary is created in which a connector for each word is indicated – the type of connection that can be created using this word. The authors considered methods of filling in LGP dictionaries using machine learning. 
The complexities of natural language processing, however, do not exclude the possibility of identifying narrower tasks that can already be solved algorithmically: for example, determining parts of speech or splitting texts into logical groups. However, some features of natural languages significantly reduce the effectiveness of these solutions. Thus, taking into account all word forms for each word in the Kazakh and Turkish languages increases the complexity of text processing by an order of magnitude
Design and simulation of a high-power double-output isolated Cuk converter
Authors: Ameen Yasir M. Y. , Al-Badrani Harith , Abdul Kadi Mohamed N.
Published: November 2021

Among the transformer-less DC-DC converters, the superiority of the conventional Cuk converter is obvious in its good properties. However, the output power is limited for all transformer-less converter types including the conventional Cuk converter. In order to get more supplied power from this converter, some changes in its design were necessary. One of these modifications is to add a transformer to transfer more power and to separate the output side from the input side. Supply of some applications such as the DC link of modular multilevel inverters, e. g. cascaded H-bridge (CHB) topologies required more than one output. Hence, this paper is concerned with the design, analysis and simulation of an isolated dual-output modified Cuk converter. The proposed converter is designed to deliver a total output power of 2,000 W using only one modulating switch. A complete design and detailed analysis of the high-frequency transformer with the ANSYS Maxwell platform is presented in this paper. The modeling and simulation results of the high-frequency transformer are validated by the experimental implementation results and good agreement was obtained with a small percentage of errors less than 4 %. A set of analytical equations has been derived and presented in this paper to represent a mathematical model of the converter. In addition, the entire converter circuit was simulated and analyzed with MATLAB/Simulink. The simulation results were checked and compared to the findings of the mathematical model, yielding an excellent match with a percentage error of less than 2.15 %. Finally, when the presented converter was tested under various loads, including unbalanced load situations, a reasonable output voltage regulation was achieved, with the two output voltages being nearly identical with a deviation of less than 0.25 % under a severe unbalanced load condition of 150 %
Determining an additional diagnostic parameter for improving the accuracy of assessment of the condition of stator windings in an induction motor
Authors: Gubarevych Oleg , Goolak Sergey , Daki Olena , Yakusevych Yuriy
Published: November 2021

This paper has proposed and substantiated the application of an additional diagnostic parameter for assessing the state of stator windings of induction motors during operation. The dependences of the values of phase shifts between phase currents and phase voltages have been obtained. These dependences showed that when an inter-turn short circuit occurs in the stator windings, the phase shifts are the same for all phases of the motor. That has made it possible to obtain the dependence of the change in phase shift on the change in the engine shaft rotation frequency.
This study's result has established the dependence of the rates of change of the phase angle on the engine shaft rotation frequency for both one and two damaged phases with varying degrees of damage. When analyzing these dependences, it was found that with an increase in the number of damaged phases of the electric motor, the linear section of the dependences decreases. In addition, with an increase in the degree of phase damage, the angle of inclination of the linear sections of the characteristics decreases. That has made it possible to determine an additional parameter for diagnosing the place and degree of an inter-turn short circuit of the windings in an induction motor with a squirrel-cage rotor. The values of the additional parameter, termed by this paper's authors as a "phase criterion" can be used to assess the condition and degree of damage to the stator winding of induction motors. The values of the phase criteria for various types of damage were: when phase A is damaged by 90 %, ξ=0.634, (deg)2/(rpm)2; when phase A is damaged by 80 %, ξ=0.393, (deg)2/(rpm)2; when phase A is damaged by 80 % and phase B is damaged by 90 %, ξ=0.25, (deg)2/(rpm)2; when phase A is damaged by 80 % and phase B is damaged by 90 %, ξ=0.173, (deg)2/(rpm)2.
The results of this research could be used to select an effective method for diagnosing an inter-turn short circuit in the stator winding when building a diagnostic system for induction motors as part of drives of transport equipment
Development of queries using the Z39.50 protocol in distributed information systems to support scientific and educational activities
Authors: Serikbayeva Sandugash , Tussupov Jamalbek , Sambetbayeva Madina , Muratova Gaukhar , Makhanov Mukhtar , Borankulova Gaukhar , Yerimbetova Aigerim
Published: November 2021

Distributed information systems that support scientific and educational activities can work with various information systems. The main goal of creating a distributed information system supporting scientific and educational activities is to accelerate the pace and improve the quality of information exchange in the scientific environment.
The paper considers technological methods for constructing models of information systems designed to support scientific and educational activities. The model under consideration is that the developed model of an information system for working with scientific materials should solve the problems of long-term storage of information, organizing data search by attributes, accumulating and replacing metadata.
Based on the analysis of typical scenarios of information servers, the tasks that should be solved when organizing an access control system for distributed information resources are formulated. Within the framework of this technology, three access control models are discussed, which differ in the degree of integration of information server functions with the Z39.50 technologies.
The creation and support of distributed information systems and electronic libraries that integrate heterogeneous information resources and operate in various software and hardware environments require special approaches to managing these systems. If the resources or data themselves can be managed locally, even for distributed information systems, then the task of managing access to distributed resources cannot be solved within the framework of local administration. The justification of the last thesis can be seen when considering typical scenarios of the information server, which we will describe below
Development of object state estimation method in intelligent decision support systems
Authors: Bezuhlyi Vitalii , Oliynyk Volodymyr , Romanenko Іgor , Zhuk Oleksandr , Kuzavkov Vasyl , Borysov Oleh , Korobchenko Serhii , Ostapchuk Eduard , Davydenko Taras , Shyshatskyi Andrii
Published: November 2021

A method of object state estimation in intelligent decision support systems (DSS) has been developed. The essence of the method is to ensure a high-quality analysis of the current state of the analyzed object. The key difference of the developed method is the use of an advanced genetic algorithm. The advanced genetic algorithm is used when constructing a fuzzy cognitive model and increases the efficiency of identifying factors and relationships between them by simultaneously finding a solution by several individuals. The objective and complete analysis is achieved using advanced fuzzy temporal models of the object state, taking into account the type of uncertainty and noise of initial data. The method also contains an improved procedure for processing initial data under a priori uncertainty, an improved procedure for training artificial neural networks and an improved procedure for topological analysis of the structure of fuzzy cognitive models. The essence of the training procedure is the training of synaptic weights of the artificial neural network, the type and parameters of the membership function, as well as the architecture of individual elements and the architecture of the artificial neural network as a whole. The method increases the efficiency of data processing at the level of 11–15 % using additional advanced procedures. The proposed method can be used in DSS of automated control systems (artillery units, special-purpose geographic information systems). It can also be used in DSS for aviation and air defense ACS, as well as in DSS for logistics ACS of the Armed Forces
Analyzing metallurgical interaction during arc surfacing of barrier layers on titanium to prevent the formation of intermetallics in titanium-steel compounds
Authors: Korzhyk Volodymyr , Khaskin Vladyslav , Grynyuk Andrii , Ganushchak Oleg , Shcheretskiy Volodymyr , Peleshenko Sviatoslav , Konoreva Oksana , Demianov Oleksii , Fialko Nataliia , Kvasnytskyi Viktor
Published: November 2021

This paper considers a possibility to obtain high-quality butt junctions of bimetallic sheets from steel clad with a layer of titanium, with the use of barrier layers. The task that was tackled related to preventing the formation of Ti-Fe intermetallic phases (IMPs) between the steel and titanium layer. The barrier layers (height ~0.5 mm) of vanadium and copper alloys were surfaced by arc techniques while minimizing the level of thermal influence on the base metal. To this end, plasma surfacing with a current-driving wire and pulsed MAG surfacing were used. The obtained samples were examined by methods of metallography, X-ray spectral microanalysis, durometric analysis. It has been established that when a layer of vanadium is plated on the surface of titanium, a defect-free structure of variable composition (53.87–65.67) wt % Ti with (33.93–45.54) wt % V is formed without IMPs. The subsequent surfacing of steel on a layer of vanadium leads to the formation of eutectics (hardness up to 5,523 MPa) in the fusion zone, as well as to the evolution of cracks. To prevent the formation of IMPs, a layer of bronze CuBe2 was deposited on the surface of vanadium. The formed layer contributed to the formation of a grid of hot cracks. In the titanium-vanadium-copper transition zones (0.1–0.2 mm wide), a fragile phase was observed. To eliminate this drawback, the bronze CuBe2 was replaced with bronze CuSi3Mn1; a defect-free junction was obtained. When using a barrier layer with CuSi3Mn1, a defect-free junction was obtained (10–30 % Ti; 18–50 % Fe; 5–25 % Cu). The study reported here makes it possible to recommend CuSi3Mn1 as a barrier layer for welding bimetallic sheets "steel-titanium". One of the applications of the research results could be welding of longitudinally welded pipes of main oil and gas pipelines formed from bimetallic sheets of steel clad with titanium.
Developing interactive interaction of dual buffering systems and conversion class systems with continuous supply of technological products
Authors: Lutsenko Igor , Koval Svitlana , Tytiuk Valerii
Published: November 2021

Many modern industrial production facilities consist of sequentially operating systems with a continuous supply of technological product. The task of stabilizing the qualitative and quantitative parameters of output products at all stages of such production is a very difficult task and often leads to additional time and money costs. Therefore, improving the efficiency of these processes is a relevant issue.
A review of analogous solutions to this type of problem revealed the variability of their authors’ approaches. However, all of them are aimed at optimizing existing control trajectories, rather than creating a new, more accurate trajectory.
Earlier, as part of the description of the basic principles of structural and parametric optimization of the management of production processes of this type, only the improved work of technological subsystems was reported.
This paper describes the principles of control over the proposed dual buffering system and its interactive interaction with other technological subsystems.
The introduction of buffering systems makes sequential technological subsystems more independent of each other. That makes it possible to increase the degree of freedom for each control subsystem and thereby improve the efficiency of finding the optimal mode of operation of the entire cybernetic system.
A conceptual model of the dual buffering system was built, the stabilization of the quantitative parameter at the output of the buffering system was substantiated through the development of an adaptation mechanism, and simulation modeling of the synthesized system was carried out.
The study shows that the use of buffering systems could improve the quality of energy utilization and reduce the wear of technological mechanisms by 14 % in general
Devising a method for improving crypto resistance of the symmetric block cryptosystem RC5 using nonlinear shift functions
Authors: Sahun Andrii , Khaidurov Vladyslav , Lakhno Valeriy , Opirskyy Ivan , Chubaievskyi Vitalii , Kryvoruchko Olena , Desiatko Alona
Published: November 2021

This paper analyzes ways to improve the cryptographic strength of the symmetric block cipher RC5. The task to enhance the stability of the classic RC5 cipher is explained by the fact that it is part of various open cryptographic libraries and is frequently used in practice. Several methods have been considered, applying which theoretically contributes to improving the stability of cryptographic transformations. It is found that unlike other alternatives (increasing the number of rounds, the length of the key, and the encryption block), the use of nonlinear shift functions does not increase the computational complexity of the RC5 algorithm. The study result has helped build an analytical model that was implemented in the form of the MATLAB (USA) software application. The software interface provides the ability to manually change the encryption parameters of the RC5 crypto algorithm. The resulting upgrade of the RC5 crypto algorithm has been tested on different sets of input data during encryption and decryption. The resulting modification also does not lead to an increase in the calculation time but makes it possible to improve the resistance to hacking the encrypted data by several orders of magnitude (210), provided that differential analysis methods are used and the number of rounds is 14. For one of the nonlinear functions used, resistance to the differential cryptoanalysis used increased by 212 times already in the eleventh round of encryption. The reliability of the improved cryptosystem has been confirmed by the absence of statistical correlation between the blocks of incoming messages and output blocks, the absence of collisions at which it is possible to obtain the same sequences of bits at the output with different messages at the input. The resulting algorithm could be applied in computer systems with low computing performance
Devising the formulation and technology for baking buns from flour of composite mixtures and sugar beet
Authors: Yakiyayeva Madina , Muldabekova Bayan , Mukhtarkhanova Rauan , Maliktayeva Pernekul , Zheldybayeva Ainur , Nasrullin Galymzhan , Toktarova Aigerim
Published: November 2021

The composition of legumes and sugar beet contains a large number of useful mineral and vitamin substances. The use of composite flour from leguminous crops for the preparation of bakery products helps increase food and biochemical properties. The main objects of this research are chickpea flour, bean flour, dry sugar beet powder, and wheat flour of the first grade. The main problem is an insufficient amount of minerals and vitamins, so the purpose of this work is to enrich bakery products and replace sugar in the recipe with sugar beet powder. The results showed that composite flour and sugar beet increased calcium content by 13.54 mg/100 g, iron ‒ by 0.57 mg/100 g, potassium ‒ by 141.03 mg/100 g, phosphorus ‒ by 38.89 mg/100 g, vitamin A ‒ by 0.002 mg/100 g, vitamin B2 ‒ by 0.016 mg/100 g, vitamin E ‒ by 0.32 mg/100 g, and vitamin PP ‒ by 0.405 mg/100 g. Microbiological indicators meet the established norms and requirements; the amount of mesophilic aerobic and facultative-anaerobic microorganisms, yeast, and mold in the test bun was the least compared to the control sample. As a result, it was proved that the use of composite flour of leguminous crops contributes to an increase in the nutritional and biological values of bakery products, and the application of dried sugar beet powder makes it possible to completely exclude sugar from the formulation of the resulting product. Employing this technology and formulations for obtaining bakery products makes it possible to expand the range of bakery products, reduce the duration of the manufacturing process, improve the quality of finished products, increase labor productivity. That also contributes to the improvement of the socio-economic indicators of bakery and confectionery enterprises
Design of an apparatus for low-temperature processing of meat delicacies
Authors: Zahorulko Andrii , Cherevko Oleksander , Zagorulko Aleksey , Yancheva Marіna , Budnyk Nina , Nakonechna Yuliya , Oliynyk Natalia , Novgorodska Nadia
Published: November 2021

Culinary meat products, in particular, delicacies, account for a significant share of the diet in many countries of the world, predetermining the need to introduce innovative solutions for the production of products of a wide range of use with original taste properties.
A structure of the device for low-temperature processing of meat delicacies involving the heating of the working surface with a flexible film resistive electric heater of radiative type has been developed. Temperature control is carried out with a needle thermocouple. That makes it possible to cool the delicacy to 25...30 °C by autonomous fans during the conversion of secondary thermal energy by Peltier elements. It was established that the low voltage at the temperature of 70...80 °C is 4...6 W, and, at 25...30 °C, it is, respectively, 1.5...3 W. A comparative analysis has been performed of the heat treatment of meat delicacy in the traditional way and in the developed apparatus upon reaching 71...75 °C inside the product.
The temperature for a traditional machine, after 5 minutes of processing, is 15...17 °C at the contact surface and 8 °C at the center. For the model structure, the temperature of the contact surface is 7...8 °C, and 4...5 °C in the center. After 25 minutes of processing in the traditional way, the temperature in the center was 17...18 °C, in the near-wall layers ‒ 60 °C. In the model structure, 8...9 °C, at a temperature of the near-wall layers of 25 °C. The temperature difference from the center to the near-wall layer, depending on the processing time in the traditional way, ranges from 10 to 50 °C, and, in the model apparatus, from 4 to 24 °C. The model device provides a uniform heat supply under conditions of achievement of 71…75 °C in the center of a product with a reduction of specific cost by 2.6 times in comparison with a traditional technique. The ham prepared in the developed apparatus is characterized by uniform coloration, juiciness, and natural original taste
Determination of optimal conditions for processing oil bottom sediments using electrohydraulic effect
Authors: Satybaldin Amangeldy , Tusipkhan Almas , Seitzhan Raikhan , Tyanakh Sairagul , Baikenova Gulzhan , Karabekova Dana , Baikenov Murzabek
Published: November 2021

Currently, there is an interest in effective technologies that cause minimal environmental harm, have low financial costs and allow you to obtain products with high added value. One of the ways to increase the yield of light and medium fractions from oil bottom sediments is to use the electrohydraulic effect. The electrohydraulic phenomenon is a new industrial method of converting electrical energy into mechanical energy, which occurs without the influence of intermediate mechanical links, with high efficiency. Statistical processing of experimental data was carried out with the identification of the optimal mode of the electrohydraulic effect on the destruction of the oil bottom sediment. The influence of various factors is shown (duration of contact, distance between electrodes, amount of added catalyst, capacitance of capacitor and value of applied voltage). The use of the generalized equation made it possible to determine the following optimal conditions for the destruction of the oil bottom sediment using electrohydraulic treatment: duration 7 min, distance 8 mm, amount of added catalyst 1.5 %, capacitance 0.3 μF, applied voltage 14 kV. In terms of the significance of the coefficient (tr), it should be noted that the dominant factors are the distance between the electrodes and the amount of added catalyst. The individual chemical composition of the light and medium fractions of the original oil residue and the processed oil residue was determined. Comparison of the individual chemical composition of fractions up to 200 °С and 200–300 °С, obtained from the oil bottom sediment and from the hydrogenated product, allows to conclude that the electrohydraulic effect has an effective effect on the destruction of the organic mass of the oil bottom sediment. The optimal conditions for electrohydraulic treatment of the oil residue aere established and it is shown that it is possible to utilize the oil bottom sediments