bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of nuclear reaction cross section data of proton and deuteron induced reactions on 75As, with particular emphasis on the production of 73Se
Authors: Amjed Nouman , Aslam M. Naveed , Hussain Mazhar , Qaim Syed M.
Published: May 2021

75Se (T1/2 = 120 d), 73gSe (T1/2 = 7.1 h) and 72Se (T1/2 = 8.4 d) are important radioisotopes of selenium, being used in tracer studies, PET investigations and as a generator parent, respectively. Cross section data for the formation of those radionuclides in proton and deuteron induced reactions on 75As were critically analyzed up to about 70 MeV. A well-developed evaluation methodology was applied to generate the statistically fitted cross sections, based on the critically analyzed literature experimental data and the theoretical cross section values of three nuclear model codes ALICE-IPPE, TAYLS 1.9, and EMPIRE 3.2. Using the fitted cross sections the integral yield of each radionuclide was calculated. For the estimation of impurities, the integral yield of each radionuclide was compared with the yields of the other two radionuclides over a given energy region, and therefrom the energy range was suggested for the high purity production of each of the radionuclides 75Se, 73Se and 72Se. For production of the very important non-standard positron emitter 73Se via the 75As(p,3n)73Se reaction, the optimum energy range was deduced to be E
p = 40 → 30 MeV, with a thick target yield of 1441 MBq/μAh and the 72,75Se impurity level of <0.1%.
Immutability of Distributed Hash Model on Blockchain Node Storage
Authors: Rahardja Untung , Hidayanto Achmad Nizar , Lutfiani Ninda , Febiani Dyah Ayu , Aini Qurotul
Published: May 2021

The blockchain system uses hash functions. Hash is used in the blockchain to mark each block of data. Hash function algorithms map a string that is usually hexadecimal of any size to a sequence of fixed-size bits. This journal will discuss the distributed hash model for immutable blockchain node storageThe methodology used in the preparation of this research is mind mapping and literature review, namely the collection of scientific journals, articles and ebooks. Storage of nodes on the blockchain using a distributed hash model. The distributed hash model only stores a portion of the block data at each node, and the block data is taken as a resource. A hash connects each block with the previous on the blockchain, so the entire blockchain transaction cannot be changed or deleted. For further research will expand the research topic regarding storage immutability on the blockchain so that it becomes more complete and detailed.
miR-375 acts as a novel factor modulating pituitary prolactin synthesis through Rasd1 and Esr1
Authors: Zhang Jinglin , Gao Jie , Zhang Di , Liu Hui , Gou Kemian , Cui Sheng
Published: May 2021

Prolactin (PRL) is a pituitary hormone that regulates multiple physiological processes. However, the mechanisms of PRL synthesis have not been fully elucidated. The aims of the present study were to study the functions and the related mechanisms of miR-375 regulating PRL synthesis. We initially found that miR-375 mainly expressed in the lactotrophs of mouse pituitary gland. To identify the function of miR-375 in the pituitary gland, the miR-375 knockout mice were generated by using Crispr/Cas9 technique. The results showed that miR-375 knockout resulted in the decline of pituitary PRL mRNA and protein levels by 75.7 and 60.4%, respectively, and the serum PRL level reduced about 46.1%, but had no significant effect on FSH, LH and TSH. Further, we identified that Estrogen receptor 1 (alpha) (Esr1) was a downstream molecule of miR-375. The real-time PCR and Western blot results showed that ESR1 mRNA and protein levels markedly decreased by 40.9 and 42.9% in the miR-375 knockout mouse pituitary, and these were subsequently confirmed by the in vitro study using transfections of miR-375 mimics and inhibitors in pituitary lactotroph GH4 cells. Further, Rasd1 was predicted by bioinformatic tools and proved to be the direct target of miR-375 in lactotrophs using the dual-luciferase reporter assay. Rasd1-siRNA transfection results revealed the negative effect of Rasd1 in regulating ESR1. Collectively, the results presented here demonstrate that miR-375 positively modulates PRL synthesis through Rasd1 and Esr1, which are crucial for understanding the regulating mechanisms of pituitary hormone synthesis.
Transfiguratus est ante eos. Desarrollo teológico de la Transfiguración del Señor en un sermón inédito del siglo XVIII
Authors: Flórez Angarita Darwin Eduardo
Published: May 2021

En el Archivo Histórico de la Provincia de San Luis Bertrán–Colombia (AHPSBC), se encuentran diversos sermones predicados por los frailes dominicos de la Nueva Granada durante el siglo XVIII. Tomando como base los métodos histórico–crítico y teológico, se hace aquí un análisis teológico del sermón De Transfiguración: Transfiguratus est ante eos (Mat 17, 2), predicado el 06 de agosto de 1786; mediante la identificación de categorías teológicas basadas tanto en fuentes bíblicas y patrísticas como de los demás escritores eclesiásticos propuestos por el autor. Debido a que estos textos gozan de un lenguaje icónico y apologético, se brindan los aportes a la Historia de la Teología a través del análisis paleográfico, archivístico, diplomático y codicológico del documento.
Wie Cloud Services das traditionelle Radiogeschäft modernisieren können
Authors: Brenner Christian
Published: May 2021

radio.cloud ist ein komplett neues technisches und operationelles Konzept zur Produktion von Radioprogrammen für UKW, DAB+ und Webradios. Insbesondere bei Radio Networks und Radio-Sendergruppen spielt radio.cloud seine maximale Effizenzsteigerung, Skalierbarkeit und Flexibilität durch Mehrfachnutzung von Inhalten und Moderationen aus. Wir interviewen in diesem Beitrag Christian Brenner, einen Medienunternehmer mit Schwerpunkt auf technischen Innovationen. Brenner baute u. a. die Firma Smart-Cast auf, die für Sender wie Disney, Fox oder Cartoon Network in vielen Ländern Asiens das lokalisierte Content-Management als Software-as-a-Service abgewickelt hat. SmartCast ist heute Teil des Satellitenkonzerns SES/Astra. Sein aktuelles Projekt ist die neue Plattform radio.cloud (in Bayern bekannt als BayCloudNet), die die Produktion und Kontribution für Radiosender über seine Firma NexCast technisch revolutioniert. Christian Brenner hat selbst auch mehrere Radio- und Fernsehsender aufgebaut, kennt also die Anforderungen seiner Kunden, die er heute als Dienstleister bedient.
One-pot fabrication of cellulose-collagen fibrous networks for potential use as wound dressing: From characterization to first evaluation of cytocompatibility
Authors: Xu Wei , Zhang Die , Cai Jie , Cheng Shui-Yuan , Ding Wen-Ping
Published: May 2021

Biomedical researchers have been attempting to construct a wound dressing with the structure and function of a bionic natural extracellular matrix. This dressing would provide a comfortable environment for wound self-healing. In this study, cellulose-collagen fibrous networks were easily fabricated via the one-pot method using genipin in situ crosslinking collagen hydrolysate in cellulose nanofibrous membranes made by electrospinning cellulose acetate and subsequent deacetylation. The morphology, properties, and successful entrapment of collagen in the cellulose fibrous dressings were validated by scanning electron microscopy, element analysis, Fourier transform infrared spectroscopy, X-ray diffraction, water-swelling test, and thermal gravimetric analysis. The functional cellulose nanofiber-based composite membranes exhibited a network structure, good thermal stability, and acceptable water resistance. Human epidermal cells seeded on the composite nanofibrous membranes presented favorable growth, indicating good cytocompatibility and suitability of the dressing to the wound. Therefore, these novel cellulose-collagen fibrous networks may have potential use in biomedical applications.
Brewing process development by integration of edible filamentous fungi to upgrade the quality of brewer’s spent grain (BSG)
Authors: Parchami Mohsen , Ferreira Jorge A. , Taherzadeh Mohammad J.
Published: May 2021

Brewer’s spent grain (BSG) is the main solid by-product of the brewing sector. High moisture and nutrient-rich content render BSG easily perishable, leading to waste generation and environmental impacts. BSG has narrow applications in both feed and food sectors due to its composition including high fiber and low protein. Therefore, a processing strategy leading to the nutritional valorization of BSG could widen its applications. In this study, submerged cultivation of edible filamentous fungi (Aspergillus oryzae, Neurospora intermedia, and Rhizopus delemar) was introduced as a strategy to enhance the protein content of BSG. The growth of all strains in BSG increased the protein content of the fermented BSG. The highest increase of protein content (from 22.6% to 34.6%), was obtained by cultivation using A. oryzae and medium supplementation. The protein content increase was followed by a decrease in the content of polysaccharides (up to ca. 50%), namely starch, glucan, xylan, and arabinan. The addition of cellulase resulted in enhanced ethanol production from BSG but led to lower concentration of recovered solids. In conclusion, simple processing of BSG using edible filamentous fungi can lead to quality improvement of BSG, providing potential economic and environmental benefits to the brewing sector.
PARTICULARITIES OF MAGNETIC FIELD SHIELDING FOR UNDERGROUND CABLE LINE BY COMPOSITE FILL-UP SOIL WITH MAGNETIC PROPERTIES
Authors:   Institute of Electrodynamics of the National Academy of Sciences of Ukraine, pr. Peremohy, 56, Kyiv, 03057, Ukraine,, Kucheriava I.M.
Published: May 2021

The computations of the magnetic field generated by high-voltage (330 kV) underground power cable line with special fill-up soil having different dimensions (bulk) are carried out by the two- and three-dimensional computer models. The supplementary soil above the cables is the composite material with effective magnetic properties and serves as a magnetic shield. The computer results obtained by 2D and 3D models are compared. The efficiency of magnetic field shielding depending on the magnetic permeability, width, and height of the fill-up soil is studied. As revealed, there is the optimal small soil height for the best magnetic field mitigation on the top of the ground directly over the cable line. In addition, the width of the magnetic soil has an appreciable effect on shielding efficiency. The shielding of underground single-circuit three-phase power cable lines is efficient only when using the magnetic fill-up soil (or ordinary external screen made of magnetic materials) with enough small height. References 14, figures 7.
The first data on the study of Corythucha arcuata (Say, 1832) (Heteroptera: Tingidae) in Kherson region of Ukraine
Authors: Meshkova Valentyna , Nazarenko Serhii , Glod Oleksandr
Published: May 2021

Oak lace bug (OLB) Corythucha arcuata (Say, 1832) (Heteroptera: Tingidae) is native to North America. In 2000 it got to Italy and has spread for recent 20 years in many countries in Europe. In 2017 OLB first registered in Kherson region of Ukraine. The aim of the research was to summarize the first data on oak lace bug spread in Ukraine. The studies were carried out in 2020 at 31 sample plots in the south-western part of the Kherson region (46°10 ' to 47°21' N, 32°10' to 33°05' E). The sample plots were located in forest stands, shelterbelts, and oaks in cities. The age of inspected stands is from 25 to 250 years old.

The presence of oak lace bug and the threat to oak trees was assessed by a point system: 0 – OLB is absent; 1 – single, one egg mass per whole plot; 2 – rare, below 10% of trees damaged; 3 – common, OLB presents not in all trees, foliage damage up to 50%; 4 – widespread, OLB presents in all trees, foliage damage up to 100%. The weighted average score of OLB presence was evaluated for different groups of stands and some of their characteristics.

The specimens of OLB and the traces of their vital activity were found at 19 sample plots (61,3%). At 51.6% of sample plots examined the OLB was common or widespread. The pest is widespread at 8 sample plots, including oaks in cities Kherson, Oleshki, and Hola Prystan, Doslidne forestry of the Steppe branch of Ukrainian Research Institute of Forestry & Forest Melioration named after G.M. Vysotsky (URIFFM) and Burkutske forestry of the Velikokopanske Forest & Hunting Enterprise.

Mean OLB score is higher in forests than in shelterbelts and has a trend to increase with oak age. The highest OLB infestation was assessed in the sample plots neighbouring city streets and forest roads and in the sample plots near the waterway. The proportion of SP with common and widespread OLB from all inhabited plots near city streets, forest roads, and waterways exceeds 80%.

The data obtained can be considered preliminary, since the reproduction, distribution, and settlement of the oak lace bug in the territory of the Kherson region began only 2 years ago.
Вплив технології створення енергетичних плантацій Salix viminalis L. на їх ріст і продуктивність після першого трирічного обороту заготівлі біомаси
Authors: Fuchylo Yaroslav , Vokalchuk Bohdan
Published: May 2021

Оцінено вплив сортових особливостей, схеми та густоти садіння живців на ріст і продуктивність енергетичних плантацій верби прутоподібної (Salix viminalis L.) впродовж двох років другого трирічного обороту заготівлі біомаси в умовах Центрального Лісостепу України. Об’єктом дослідження були плантації двох сортів – ‘Тора’ і ‘Тернопільська’, які висаджені дворядними кулісами з відстанню між рядами 0,75 м, за двох схем садіння живців: відстань між кулісами – 1,5 м (0,75-1,50-0,75 м) та 2,5 м (0,75-2,50-0,75 м). За обох схем садіння, вибравши відповідну відстань між живцями у ряду, було сформовано насадження з трьома варіантами густоти: 12, 15 та 18 тис. шт. га-1. Після досягнення дослідними насадженнями трирічного віку, їх надземна частина була зрізана. На початку четвертого року вегетації зі зрізаних кущів появились молоді пагони, результати дослідження біометричних показників яких впродовж двох років наведені у цій роботі.
Зі збільшенням густоти садіння на всіх варіантах досліду спостережено зменшення середньої висоти кущів. Найбільшу середню висоту (6,09 м ) мали рослини сорту ‘Тора’ за схеми садіння 0,75-1,50-0,75 м та густоти 12 тис. шт.·га-1. Виявлено тенденцію до зменшення кількості пагонів у кущі та їхньої висоти за збільшення густоти плантації. Кількість пагонів у кущі дворічних плантацій становила в межах від 4,8 до 6,9 шт. у сорту 'Тора'  та від 5,0 до 8,0 шт. на один кущ у сорту 'Тернопільська'.
Максимальні показники продуктивності за два роки (41,7 т·га-1 сухої біомаси) та приросту біомаси впродовж другого року (21,3 т·га-1 сухої біомаси) зафіксовані в насадженнях сорту ‘Тора’ за схеми садіння 0,75-1,50-0,75 м і густоти 15 тис. кущів на 1 га. У сорту ‘Тернопільська’ найвищу врожайність (30,5 т·га-1) було зафіксовано за тієї ж схеми садіння і густоти на 1 га. За відстані між кулісами 2,5 м найвищу продуктивність дворічної біомаси також мав сорт ‘Тора’ – 34,0 т·га-1. Максимальна продуктивність сорту ‘Тернопільська’ становила 23,5 т·га-1, а мінімальна (17,5 т·га-1) – за максимальної густоти садіння (18 тис.шт.·га-1).
Еколого-соціо-економічний аналіз управління міськими територіями в умовах зміни клімату: на прикладі міст обласного значення України
Authors: Soloviy Vitaliy , Dubovich Ion
Published: May 2021

Зміна клімату на території України швидко прогресує, втім національна екологічна політика наразі не відповідає нагальності кліматичних викликів. У цьому контексті особливої актуальності набуває роль міст, як середовищ уразливості до зміни клімату, втім, також і джерела потенційних рішень. На основі аналізу 78 планів міст обласного значення України, які є учасниками Глобальної Угоди мерів щодо клімату та енергії, наведено критичний міждисциплінарний аналіз виконання містами своїх зобов’язань і цілей щодо зменшення викидів, ефективності управління міськими територіями в умовах зміни клімату, а також парадигм, у рамках яких розгортається екологічна політика щодо зміни клімату на місцевому рівні. Виявлено, що більшість міст працюють у рамках парадигми слабкої сталості, застосовують підходи, які не відповідають особливостям викликів зміни клімат, і не виконують поставлених цілей. Поширений суто формалістичний підхід до використання шаблонів для планування, декларативне ставлення до питань адаптації та фрагментарна звітність. Перевага надається вузькому спектру рішень, а супутні вигоди заходів переважно не розглядаються. Водночас, наявні позитивні тенденції, такі як виникнення нішевих інновацій, розбудова мереж та нагромадження досвіду в окремих секторах. Розроблено методику оцінювання ефективності управління міськими територіями в умовах зміни клімату та з її допомогою здійснено оцінку трьох міст обласного значення – Львова, Харкова та Одеси. На основі здійсненого аналізу та результатів оцінювання, запропоновано рекомендації щодо переходу від слабкої до трансформаційної парадигми сталості, як передумови ефективного управління міськими територіями в умовах зміни клімату.
Examining the Road Networks and Locations of Firefighting Teams by Using GIS Techniques
Authors: İnanç Taş , Abdullah E. Akay
Published: May 2021

For effective response to forest fires, the period of time necessary for the firefighting team to reach the fire site should not exceed the critical response time, where the fire is more likely to be taken under control. For this reason, the optimum route that allows the team to reach the fire site by a fire truck within the shortest time possible should be determined. Computer-aided methods such as the road network analysis are widely used in the solution of such transportation problems that require the shortest path analysis. In this study, the locations of the existing road networks and firefighting team were examined using GIS techniques in order to determine the optimum route that will provide the promptest access to the fire site. The study was carried out in the Adana Forest Enterprise Directorate, where first degree fire-sensitive forests are located. There are three firefighting teams located in the boundaries of the study area. The sites in the study area where previously occurred forest fires (15), which burned 1 ha or more forest areas, were evaluated as potential fire sites. The analysis results showed that 64,12% of the forest areas in the study area was reached by the firefighting teams within 20 minutes, which is the critical response time for first degree fire sensitive forests. It was found that the teams could reach 12 potential fire sites within the critical response time. This result revealed the necessity to establish new firefighting teams in the study area. In addition, it is thought that improving the road network density in the study area by building new roads or increasing the truck travel speed by improving the conditions of existing roads will help to solve the problem.
Desafíos y tensiones al orden de género en la Universidad del Valle
Authors: Ibarra María Eugenia
Published: May 2021

Este artículo analiza las relaciones y prácticas de género de los estudiantes de la Universidad del Valle, desde una perspectiva constructivista, que devela los vínculos y entrecruzamientos que las definen, capta las interacciones entre hombres y mujeres, homosexuales, transexuales e individuos de género fluido, jóvenes y adultos, blancos mestizos, afrocolombianos e indígenas, caleños, vallecaucanos y de otros municipios de Colombia; casi todos de ingresos bajos y medios. También se fija en los actos y comportamientos relacionados con las posiciones sociales de los estudiantes y en los modos de apropiación del campus, identificando espacios de representación y representaciones del espacio, la separación que se percibe entre los géneros, las etnias, los consumos o la pertenencia a una disciplina. La ruta de investigación privilegia la mirada etnográfica y la observación intencional, utiliza como principales herramientas las conversaciones informales, los grupos focales, los talleres y la cartografía social. La información obtenida permite evidenciar que en el campus de Meléndez interactúan diversas sexualidades y orientaciones del deseo, identidades y expresiones de género, que conviven en un ambiente de reivindicaciones y de retos a los privilegios de la masculinidad hegemónica. Esas tensiones se producen en un campo de deliberación y disputa, que revela la oposición al sistema sexual binario, por parte individuos y de algunos agentes vinculados a colectivos y organizaciones políticas, pero también la defensa del orden de género por parte de otros. El texto se divide en tres apartados: en primer lugar, muestra cómo los estudiantes se apropian del espacio y entran en disputa por subvertir o mantener el orden de género. En segundo lugar, el artículo describe el modo en que se produce su sociabilidad en la universidad y destaca matices en las prácticas espaciales que se viven en el campus. En tercer lugar, analiza cómo y quiénes enfrentan algunas prácticas heteropatriarcales o las mantienen para preservar el orden de género.
Transfronterización, sobrefronterización y desfronterización. El arte de la performance en la frontera entre Estados Unidos y México
Authors: Bouhaben Miguel , Piñeiro Eleder
Published: May 2021

En este texto interpretativo-hermenéutico se utilizan obras artísticas realizadas en la frontera entre Estados Unidos y -México para reflexionar acerca de conceptos filosóficos y antropológicos alrededor de la securitización de la movilidad humana y al límite como categoría central en la construcción de la modernidad capitalista. La singularidad de estas obras radica en que intervienen performativamente el espacio fronterizo con la finalidad de explicar el carácter poroso, construido, difuso y heterogéneo de las fronteras, siendo la más extensa del mundo un laboratorio biopolítico desde el cual poder generalizar. Asimismo, las obras artísticas analizadas abordan una variedad de disciplinas cuyos procesos suponen una transgresión poética de los límites fronterizos. Del estudio del corpus de obras surgieron tres categorías de trabajos performativos sobre la frontera: transfronterización, que implica una transgresión del límite a través del cuerpo; la sobrefronterización, que desarrolla una acción que se superpone y opera sobre el propio límite; y la desfronterización, que aboga por la eliminación poética del límite. De este modo, en los análisis se aborda la transfronterización performativa, como desafío a las formas de control que imponen los pasos fronterizos a través del uso del cuerpo como acto lúdico, como expresión de la diferencia y como abyección (To the Rhythm of the Swing, Rocío Boliver, 2012); la sobrefronterización performativa, como sobreescritura de una acción sobre el límite de la frontera en el Río Bravo, que opera en torno a la paradoja movilidad/inmovilidad y entendimiento-creatividad (Operation Tumbleweed, K. Yoland, 2018); y la desfronterización performativa, como mecanismo de borramiento de la valla para la configuración de una posibilidad utópica y un mundo-otro sin límites que puede leerse como una desfronterización política, antropológica y deconstructiva (Erasing the Border, Ana Teresa Fernández, 2012). Tras los análisis, en la parte final del trabajo defendemos el carácter transdisciplinar y contestatario, tanto de las obras seleccionadas como de la propuesta activista de sus autores.
Diseño y validación de un cuestionario para evaluar oportunidades de práctica pedagógica, metacognición y «lifelong learning», brindadas por los programas de formación inicial docente
Authors: Matsumoto-Royo Kiomi , Ramírez-Montoya María-Soledad , Conget Paulette
Published: May 2021

El objetivo del estudio fue diseñar y validar un cuestionario para recoger información respecto de las oportunidades que brindan los programas de formación inicial docente de aproximarse a la práctica pedagógica, de desarrollar habilidades de procesamiento metacognitivo y de adoptar el lifelong learning. El instrumento fue diseñado conforme a la literatura y validado usando el método Delphi. Fue aplicado en una muestra de 198 estudiantes de Pedagogía. Luego de ajustes en función de los resultados de un análisis factorial confirmatorio, se obtuvo una versión de alta validez y confiabilidad. El cuestionario está organizado en tres dimensiones y 24 reactivos y permite estudiar desde la perspectiva de los estudiantes las acciones de los programas de formación docente, constituyendo un marco referencial para orientar las decisiones de ajuste e innovación en este ámbito de formación.
Alternative evaluation of voltage at top of transmission line tower stricken by lightning
Authors: Trotsenko Yevgeniy , Dixit Mandar Madhukar , Brzhezitsky Volodymyr , Haran Yaroslav
Published: May 2021

The object of the research is a circuit that simulates a lightning strike to a tower of 220 kV power transmission line, taking into consideration the reflection of a current wave from 10 nearest towers. Computation of the voltage arising at the top of the stricken tower is necessary further to determine the lightning performance of transmission line by various methods. For Indian conditions, the average number of lightning strikes to this power line per 100 kilometers per year is about 77, which is a fairly high figure. As a rule, for the tasks of lightning protection, the lightning current is approximated by some analytical expression. In most cases, such expressions are various combinations of exponential functions. However, the waveform of real lightning currents on oscillograms differs significantly from the waveform attributed to them and approximated by relatively simple exponential expressions. For a more detailed study of transient processes caused by thunderstorm activity, there is a need to use oscillograms of real lightning currents when modeling.
The problem of determining the voltage at the top of the stricken transmission line tower was solved using circuit simulation. To simulate the lightning current, digitized oscillograms of real lightning currents with peak values of –5.256 kA and –133.586 kA were applied.
The article shows that the proposed approach gives a more accurate and visual representation of the transient process at the top of the stricken tower than the approximation of the lightning current by simple exponential expressions. Applying a simplified exponential description of the lightning current leads not only to a simplification of the nature of the transient process at the tower top, but also to an underestimation of the results to 8.8%. The selection of the equivalent circuit for the power line towers also affects the result. Representation of towers in the equivalent circuit with lumped inductances leads to slightly higher values compared to application of surge impedances in the circuit. In this case, the smaller the current amplitude, the greater the difference (8.6 % in the domain of low currents and 1.9 % in the domain of high currents). Since this leads to some reserve during the computations of lightning performance, it is recommended to use an equivalent circuit with lumped inductance for a transmission line tower.
The conducted research contributes to the development of methods for calculating the lightning performance of power lines and extends the scope of application of circuit simulation programs.
Influence of heating to high temperatures on mechanical properties of boride-based refractory materials
Authors: Lokatkina Anastasiia , Prikhna Tetiana , Moshchil Viktor , Barvitskyi Pavlo , Borimsky Oleksandra , Devin Leonid , Ponomaryov Semyon , Haber Richard , Talako Tatiana , Bondar Anatoly
Published: May 2021

The object of research is HfB2, ZrB2 and ceramics composition HfB2-30 % SiC and ZrB2-20 % SiC, ZrB2-20 % SiC-4 % Si3N4 obtained under high pressure, their mechanical characteristics before and after heating to high temperatures and temperatures of beginning of melting. The research was conducted in order to create new effective refractory materials for use in the aerospace industry. Therefore, the melting temperatures of sintered materials and the effect of heating on their mechanical properties were also studied. Additives (ZrB2-20 % SiC and HfB2-30 % SiC) although led to a decrease in specific gravity. But increased hardness (by 17 % and 46 % in the case of ZrB2 and HfB2, respectively) and fracture toughness (by 40 % and 21 % in the case of ZrB2 and HfB2, respectively). However, significantly reduced the onset of melting temperature in vacuum to 2150–2160 °C.
Materials sintered from ZrB2 and HfB2 was not melted after heating to 2970 °C. After heating to a melting point of 2150–2160 °C (in the case of materials with additives) and to temperatures of 2970 °C (in the case of materials sintered with ZrB2 or HfB2), the hardness and fracture toughness decreased. Thus, the hardness of the material prepared from ZrB2 decreased by 19 % and its fracture toughness – by 18 %, and of that prepared from ZrB2–20 % SiC – by 46 % and 32 %, respectively. The hardness of the material prepared from HfB2 decreased by 46 %, its fracture toughness – by 55 %, and of that prepared from HfB2-30 % SiC, after heating decreased by 40 %, but its fracture toughness increased by 15 %. The sintered HfB2 (with a density of 10.4 g/cm3) before heating showed a hardness of HV(9.8 N)=21.27±0.84 GPa, HV(49 N)=19.29±1.34 and HV(98 N)=19.17±0.5, and fracture toughness K1C(9.8 N)=0.47 MH·m0.5, and ZrB2 with a density of 6.2 g/cm3 was characterized by HV(9.8 N)=17.66±0.60 GPa, HV(49 N)=15.25±1.22 GPa and HV(98 N)=15.32±0.36 GPa, K1C(9.8 N)=4.3 MH·m0.5. Material sintered with HfB2-30 % SiC (density 6.21 g/cm3) had Hv(9.8 N)=38.1±1.4 GPa, HV(49 N)=27.7±2.8 GPa, and K1C(9.8 N)=8.1 MH·m0.5, K1C(49 H)=6.8 MH·m0.5. The sintered with ZrB2-20 % SiC material had density of 5.04 g/cm3, HV(9.8 N)=24.2±1.9 GPa, HV(49 N)=16.7±2.8 GPa, K1C(49 H)=7.1 MH·m0.5. The SiC addition to the initial mixture significantly reduces the elasticity of the materials.
Determination of inductances for pulsating current traction motor
Authors: Goolak Sergey , Tkachenko Viktor , Sapronova Svitlana , Spivak Oleksandr , Riabov Ievgen , Ostroverkh Oleksandr
Published: May 2021

The object of research is a pulsating current traction motor. To improve the accuracy of its mathematical model, it is necessary to use the values of the parameters that are determined in experimental studies of the electric motor. In particular, it is important to use in the model of the electric motor inductance obtained experimentally. A method is proposed for calculating the inductance of the armature winding, main poles, additional poles and compensation winding and the total inductance of the traction motor armature circuit. The calculations are based on the results of the indirect inductance measurement method, in which the electrical values of various modes of power supply of the electric motor windings are directly measured, and the inductances are determined by auxiliary calculations. The inductances of the traction motor armature circuit have a non-linear dependence on the current flowing through them. The main difference of the study is that the measurements of the electrical parameters required for calculating the inductance are carried out over the entire range of operating currents of the windings. The essence of the proposed technique is to measure the active power in the armature winding, the winding of the main and additional poles, and the compensation winding, as well as in the armature circle as a whole when they are supplied with alternating current. According to the obtained values of active power losses and phase displacement, the corresponding reactive power losses are determined, with the help of which the inductances of the motor windings are calculated. Approbation of the methodology for calculating the conduction inductance for an electric motor of a pulsating current NB-418K6 (country of origin Russia), is used on electric locomotives of the VL80T and VL80k series (country of origin Russia). A scheme for measuring electrical parameters necessary for calculating inductance is proposed. The graphical dependences of the inductance on the armature current, built on the basis of calculations, confirmed the hypothesis about the nonlinear dependence of these inductances on the armature current. For further application of the results obtained in the simulation of the operation of the traction electric motor NB-418K6, a polynomial approximation of the total inductance of the armature circuit was performed.
Implementation of artificial intelligence in the construction industry and analysis of existing technologies
Authors: Kyivska Kateryna , Tsiutsiura Svitlana
Published: May 2021

The object of research is the process of using information technology in the construction industry. One of the most problematic areas is increasing the efficiency of the construction industry through the introduction of digital technologies. The research carried out is based on the application of an approach that is implemented using artificial intelligence. The study used machine learning and fuzzy logic methods to mark visual data and analyze it for potential threats, as well as to reduce all possible risks. The main feature of this approach is that using machine learning technology, it is possible to reduce the risks of a project before they affect its profit. So, using artificial intelligence in combination with BIM technologies, it is possible to predict work on construction projects based on real-time data, past activities and other factors in such a way as to optimize construction processes. The benefits to be gained from implementing digital processes will become even more evident in future projects as AI continues to analyze company data. This is due to the fact that the proposed approach using fuzzy logic has a number of features, in particular, the more information machine learning algorithms process, the more complex they become. As a result, they provide even more useful information and allow to make even better decisions. This provides an opportunity to minimize risks and efficiently allocate resources when working on projects. Compared to conventional information technology, artificial intelligence can be used to build a knowledge-based security management system and combine statistical probabilities to help mitigate security risks in construction projects.
Research of the rheological properties of water variances of polysaccharides
Authors: Tochkova Oksana , Gagan Inna , Мelnyk Oksana
Published: May 2021

The object of research is aqueous dispersions of polysaccharides. One of the most problematic factors is the insufficient study and study of the physicochemical properties of polysaccharides, in particular starch. Among natural polysaccharides, starch occupies a unique position. It has a wide range of applications across many industries and technologies. This is what determines a large number of studies of the state of starch of various botanical origin under the action of various factors that have appeared in the literature recently. Natural polysaccharides, in contrast to synthetic ones, are characterized by a partial ordered structure, formed in the process of synthesis and growth.
In the course of the study, a new method of relaxation in starch mixtures was proposed. It was found that structural relaxation in time is slow and long. It was also found that the physicochemical characteristic of polysaccharides, relaxation, is explained by a partially ordered structure with the mutual arrangement of individual chains in a spatial network. It was shown that, under the action of shear stresses, the retest destroys the pseudoplastic liquid structures of aqueous dispersions of starch, followed by restoration to an equilibrium state within 17 hours. The process of recovery or structural relaxation of the spatial structures of aqueous dispersions of polysaccharides occurs due to the rearrangement of the spatial network of the polymer and is formed due to the existence of cross-linked chemical bonds.
Thanks to this method of using polysaccharides, it is possible to obtain improved organoleptic, structural, mechanical and physicochemical characteristics of food products. Compared to similar thickeners (pectin, flour), native potato and corn starches provide and provide structural form to products such as sauces, puddings, pastries, minced meat, fish products, and low fat dairy products. In the food system, the role of polysaccharides is to stabilize structure and interact with other components to deliver or maintain nutrients and taste.
Improvement of images by using graduate transformations of their Fourier depictions
Authors: Polovynko Ihor , Kniazevich Lubomyr
Published: May 2021

The object of research is low-quality digital images. The presented work is devoted to the problem of digital processing of low quality images, which is one of the most important tasks of data science in the field of extracting useful information from a large data set. It is proposed to carry out the process of image enhancement by means of tonal processing of their Fourier images. The basis for this approach is the fact that Fourier images are described by brightness values in a wide range of values, which can be significantly reduced by gradation transformations. The work carried out the Fourier transform of the image with the separation of the amplitude and phase. The important role of the phase in the process of forming the image obtained after the implementation of the inverse Fourier transform is shown. Although the information about the signal amplitude is lost during the phase analysis, nevertheless all the main details correspond accurately to the initial image. This suggests that when modifying the Fourier spectra of images, it is necessary to take into account the effect on both the amplitude and the phase of the object under study.
The effectiveness of the proposed method is demonstrated by the example of space images of the Earth's surface. It is shown that after the gradation logarithmic Fourier transform of the image and the inverse Fourier transform, an image is obtained that is more contrasting than the original one, will certainly facilitate the work with it in the process of visual analysis. To explain the results obtained, the schedule of the obtained gradation transformation into the Mercator series was carried out. It is shown that the resulting image consists of two parts. The first of them corresponds to the reproduction of the original image obtained by the inverse Fourier transform, and the second performs smoothing of its brightness, similar to the action of the combined method of spatial image enhancement. When using the proposed method, preprocessing is also necessary, which, as a rule, includes operations necessary for centering the Fourier image, as well as converting the original data into floating point format.
Intellectual theory of value: substantiation and formulation
Authors: Yereshko Julia , Kreidych Iryna
Published: May 2021

The object of research is the role of the intellectual capital and knowledge in modern economics and value creation process. Therefore, taking into account the intellectual component of value due to the transformation of the society’s productive forces structure in the transition to a post-industrial economic system, there was proven the necessity of rethinking the existing theories of value.
Based on the classic politeconomists, neoclassics and institutionalists groundwork analysis, there was defined the economic essence of the intellectual capital. This essence consisted in the people’s capacity, using the personal factor of production, rather part of it – the knowledge and intellect, to produce objectified factors. Also, there was justified the place of an intellectual capital in a system of productive forces – its feature of simultaneous affiliation to an immaterial (as a form of individual development), as far as to a material (applied knowledge) spheres.
Due to active modern automation and robotics in manufacturing, labour as a factor of production is gradually replaced by knowledge: personal and ones materialized in the means of production. Thus, there are grounds for the assumption that namely knowledge, not labour, that is present in all spheres of social production, but rather, more accurately, the productive part of knowledge – an intellectual capital is the source of the value of goods in a post-industrial (neoindustrial) economic system. Modern economy has inherent significant share the intellectual component that participates in generating the innovative goods as the new value.
Therefore, based on the above stated, the «intellectual theory of value» was formulated, which defines directions for the intellectual economics paradigm development in future.
Docência masculina em Naviraí/MS: vivências e representações sociais
Authors: Alves de Oliveira Leonardo , Peres Gonçalves Josiane
Published: May 2021

Ainda que a população brasileira seja majoritariamente formada por mulheres, é muito expressiva a parcela que estas constituem na composição do corpo docente da educação básica, especialmente na educação infantil e nos anos iniciais do ensino fundamental. Entre os fatores de ordem cultural, social, política e econômica que provocaram o processo de feminização do magistério, é importante destacar as representações, imagens e símbolos atribuídos aos profissionais docentes devido às possibilidades de serem ativados(as) pela atuação desses profissionais. Nesse sentido, considerando a pequena parcela de professores homens, a pesquisa desenvolvida pelo Grupo de Estudos e Pesquisa em Gênero, Desenvolvimento e Educação da UFMS, buscou identificar as representações sociais relacionadas à atuação profissional de professores homens de educação infantil e anos iniciais do ensino fundamental por meio de entrevistas semiestruturadas gravadas, transcritas e analisadas. A utilização de grupos taxionômicos no estudo em representações sociais justificou-se pelo fato de os entrevistados (familiares, professores e gestores) comporem subgrupos que eventualmente possam se encontrar e pelos seus supostos interesses comuns no que diz respeito à educação de crianças. Os resultados revelam representações de gênero que transpõem-se a homens e mulheres como professores em relações de contradição.
Lentidão e nuanças: a ideia de mestre e cultura autêntica em Nietzsche
Authors: Hardt Lúcia Schneider , Junior Paulo Becher
Published: May 2021

formação humana, inclusive as definições de maestria. Nesse cenário de reflexões, indagamos: existe espaço na realidade pedagógica atual para um mestre que apela para a hesitação como um recurso pedagógico? Uma hesitação pautada pela lentidão e nuances. Caberia a figura de um mestre com esse estilo dentro de um mundo que se caracteriza como veloz, onde o tempo não pode parar? Diante desta proposta de formação, não é preciso pressa. Tornando-se amigo do tempo lento, há de ser possível perceber as sutis verdades escondidas na trajetória formativa de cada um, e, desta forma, compreender que a filosofia da orientação proposta por Nietzsche se configura como um contínuo processo de reorientação e assim aprendemos a estreita relação entre a cultura autêntica e a noção do cultivo de si, condições necessárias para afirmar a vida, inclusive a considerar sua inteireza trágica. Para essa empreitada, mestres são necessários. A ação do mestre visa libertar o discípulo dos grilhões que aprisionam a sua formação aos interesses da sociedade, buscando desenvolver atividades que possibilitem a força humana de criação.
Aprendizagem e Competência: uma análise da Base Nacional Comum Curricular (BNCC)
Authors: Enzweiler Deise Andreia
Published: May 2021

O objetivo desse artigo é problematizar a concepção de aprendizagem a partir de três documentos oficiais recentes da educação brasileira: as Diretrizes Curriculares Nacionais Gerais para a Educação Básica (2010); o Plano Nacional de Educação (2014) e a Base Nacional Comum Curricular - BNCC (2018). As reflexões aqui propostas ancoram-se metodologicamente ao campo dos Estudos Foucaultianos e analiticamente em autores da teorização social contemporânea e dos Estudos Curriculares. Como conclusão dessa análise, que configura um recorte de pesquisas ainda em andamento, destaca-se que há ênfases distintas em relação à aprendizagem, especialmente com as novas proposições apresentadas na BNCC.
Principais marcadores tumorais de câncer de mama: revisão da literatura
Authors: Da Silva Mônica Pereira , De Campos Renata Aparecida , Simioni Patricia Ucelli
Published: May 2021

O câncer é uma alteração celular decorrente de alterações multifatoriais, como a idade, fatores genéticos e lesões proliferativas atípicas, podendo atingir um ou vários órgãos do corpo. O tumor de mama se destaca pelo seu risco letal e mutilador, sendo que sua identificação em estágios inicias resulta em uma maior chance de cura. Os marcadores tumorais são substâncias encontrados em tumores e em líquidos biológicos e alterações na expressão dos mesmos estão diretamente ligadas ao crescimento de células neoplásicas. Existem vários marcadores tumorais, sendo que alguns podem ser específicos enquanto outros estão presentes em diversos tipos de tumores. Estes biomarcadores são importantes para o diagnóstico precoce do tumor de mama, favorecendo o tratamento e a sobrevida do paciente. Os marcadores mais utilizados para diagnóstico e acompanhamento clínico de tumores de mama são: antígeno tumoral semelhante à mucina (MCA; mucin like antigen), antígeno do tumor 15.3 (CA15.3), antígeno de câncer 27.29 (CA 27.29), oncogene C-erbB-2, catepsina e antígeno carcinoembrionário (CEA).  Embora esses marcadores sejam amplamente utilizados, a avaliação de novos marcadores irá possibilitar o desenvolvimento de novos estudos clínicos, entre eles terapias gênicas específicas para tumores de mama.
Pessoas idosas institucionalizadas, transtornos depressivos e questões odontológicas: qual o estado da arte?
Authors: Lopes Luiza Guilhermina de Oliveira , Santos Camila Mello dos , Bulgarelli Alexandre Fávero
Published: May 2021

Resumo Objetivo Fazer um mapeamento e uma discussão sobre o conhecimento científico envolvendo o objeto de pesquisa Condições de saúde bucal e depressão em idosos institucionalizados. Método Revisão de Escopo do tipo mapeamento da literatura. O mapeamento dos dados selecionados foi feito pela técnica de sistematização de dados por meio da Análise de Conteúdo Somativa na perspectiva de Temas Manifestos nos textos. Após as exclusões foram selecionados 27 artigos. Resultados Com a análise dos artigos foi possível dividi-los em dois temas. Todos os continentes possuem publicações acerca do tema. Sobre sua metodologia, muitas pesquisas com desenho de estudos dedutivos foram realizadas e poucas pesquisas foram desenvolvidas com métodos indutivos. Conclusão O presente estudo identificou que existe uma interlocução entre algumas condições de saúde bucal (xerostomia e perda dentária) e prevalência de transtornos depressivos em idosos institucionalizados.