DOI
string | abstract
string | title
string | author
list | URL
string | year
int64 | month
string |
|---|---|---|---|---|---|---|
10.20535/2411-1031.2021.9.1.249839
|
<jats:p />
|
Method of identification of data routes in wireless self-organized networks
|
[
"Divitskyi Andrii ",
"Salnyk Serhii ",
"Hol Vladyslav ",
"Storchak Anton "
] |
https://doi.org/10.20535/2411-1031.2021.9.1.249839
| 2,021
|
December
|
10.20535/2521-1943.2021.5.3.240310
|
<jats:p>The advantages and disadvantages of methods for gallium nitride crystals production are considered. The convergence of the solution of the problem of electroresistive heating at determination of a thermal condition of the high pressure apparatus cell is investigated. The thermal state of the high pressure apparatus cell used to determine the solubility of gallium nitride in iron has been modeled and investigated. It is determined that the combined discretization with the use of triangular and quadrangular elements allows to reduce the time of solving the coupled problem of electrical and thermal conductivity under these conditions. The results of calculations are presented by steady temperature fields in various elements of the device. It was obtained that at the temperature in the cell control point of 1800 °С its axial difference in the volume of the investigated sample of iron was 62 °С , the maximum difference was 156 °С. The simulated cell configuration and the heating conditions defined for it are acceptable for experimental studies of the solubility of GaN in contact with Fe under conditions of high pressures and temperatures.</jats:p>
|
Finite element analysis of electroresistive heating of a high pressure apparatus for studying the solubility of GaN in Fe
|
[
"Liudvichenko Oleksiy ",
"Anisin Oleksandr ",
"Lyeshchuk Oleksandr ",
"Shchydlovskyi Vitaliy "
] |
https://doi.org/10.20535/2521-1943.2021.5.3.240310
| 2,021
|
December
|
10.20535/2521-1943.2021.5.3.244795
|
<jats:p> The overview of modern forms and trends of international cooperation in aviation industry is presented.
The actuality of choice of cooperation schemes and main indices values of cooperation production for the aviation industry of Ukraine is determined.
The analysis of dependences of key technical and economic indices of the Project of creation of aircraft cooperative production is carried out and the aggregative methodology of estimation of aircraft cooperative production project efficiency is offered.</jats:p>
|
Aggregative Methodology of Aircraft Cooperative Production Project Efficiency Evaluation
|
[
"Kryvova Svitlana ",
"Zubanyov Alexander ",
"Rudko Artem ",
"Trubachev Serhii "
] |
https://doi.org/10.20535/2521-1943.2021.5.3.244795
| 2,021
|
December
|
10.20535/2521-1943.2021.5.3.248054
|
<jats:p>Problems. The choice of a rational method for stamping blanks with two hollows is usually carried out according to the permissible degree of deformation, the coefficient of material utilization, and the productivity of the process without taking into account the effect of the deformation pattern on the final mechanical properties of the stamped semi-finished product.
Purpose of the study. Determination of a rational method for stamping a blank of a 40x53 mm grenade launcher cartridge case based on the results of computer modeling using the finite element method. Cartridge case material - AD35 aluminum alloy. The workpiece has two hollows with different diameters and depths.
Implementation technique. By means of computer modeling using the finite element method, two options for stamping of a workpiece are researched - double-sided extrusion and sequential reverse extrusion with tilting of the workpiece.
Research results. Based on the results of the research, the features of deformation according to the given schemes, as well as the energy-force parameters and parameters of the stress-strain state of the processes, are determined. It has been established that both methods make it possible to obtain blanks with specified geometric dimensions. At the same time, sequential back extrusion provides a more uniform and predictable deformation of the material along the cross-section of the workpiece, but loses in productivity to double-sided extrusion.
Conclusions. The obtained research results can be used as criteria when choosing the optimal option for stamping of a workpiece with two hollows by cold extrusion.</jats:p>
|
Cold stamping of a cartridge case blank for 40x53 mm caliber grenade launcher ammunition
|
[
"Orlyuk Mikhailo ",
"Pimanov Pimanov ",
"Zhukov Vitaliy "
] |
https://doi.org/10.20535/2521-1943.2021.5.3.248054
| 2,021
|
December
|
10.20535/2521-1943.2021.5.3.248729
|
<jats:p>May 5, 2021 marked the 76th anniversary of the foundation of Zaporizhzhia Machine-Building Design Bureau Progress State Enterprise named after Academician

H. Ivchenko (Ivchenko-Progress SE).

On May 5, 1945, by order No. 193 signed by the People's Commissar of the Aviation Industry of the USSR O. Shahurin a research and development bureau (RDB) was established at the State Union Plant No. 478 in Zaporozhye to develop new and update earlier designed medium and low power aircraft engines for civil aviation.</jats:p>
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Ivchenko-Progress Se State and Prospects of its Development
|
[
"Kravchenko Ihor ",
"Kondratyuk Eduard "
] |
https://doi.org/10.20535/2521-1943.2021.5.3.248729
| 2,021
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December
|
10.20535/2522-1078.2021.1(9).240550
|
<jats:p>Медійна грамотність розглядається як компонент інформаційної безпеки особистості в умовах зростання напруженості медіасфери, поширення інфодеміі (“епідемії дезінформації”). Медіаосвіту названо умовою розвитку культури існування громадян в глобальному інформаційному просторі, навичок самостійного критичного аналізу змісту медіадискурсу. Автор стверджує, що протистояння інфодеміі являє собою своєрідний тест на рівень медійної грамотності, який значною частиною громадян не може бути пройдений успішно.</jats:p>
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Медійна освіта як вакцина про інфодемію та фактор протипоказання маніпуляції
|
[
"Венидиктов С. В. "
] |
https://doi.org/10.20535/2522-1078.2021.1(9).240550
| 2,021
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December
|
10.20535/2522-1078.2021.1(9).240576
|
<jats:p>Статтю присвячено наратору і нарації в документальних аудіотворах. Її метою є окреслення можливих feature-рівнів і категорій нарації. Визначено дослідницькі питання, пов’язані з можливими категоріями наратора у feature. У статті представлено також класифікацію аудіо- і візуальних текстів в їхній адаптації до радіопередач. Художні якості радіопередачі окреслюються як нараційні форми. Під нараційними радіоформами розуміють аудіотексти культури, що за допомогою слів і так званої звукової сценографії, породжених фікшн- і нон-фікшн-дійсністю, презентують події, героїв, історію тощо. </jats:p>
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Нарація в художньому радіорепортажі
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[
"Ковальська-Елькадер Н. "
] |
https://doi.org/10.20535/2522-1078.2021.1(9).240576
| 2,021
|
December
|
10.20535/2522-1078.2021.1(9).240613
|
<jats:p>Предметом дослідження стали напрями й умови взаємодії між редакціями наукових журналів, авторськими колективами та аудиторіями. У дослідженні використано метод моделювання. Розроблено модель фахової комунікації за посередництвом наукового журналу. Пізнавальні можливості моделі полягають у тому, що модель відтворює загальні риси предмета дослідження. Вибір методу дослідження зумовлено тим, що моделі легко візуалізуються, допомагають зосередитися на головному, а також дають змогу прогнозувати результат. Розроблена автором модель відображає структуру, вдастивості та взаємозв’язки між суб’єктами фахової комунікації, яка відбувається за посередництвом наукового журналу: 1) відправниками повідомлення — авторами чи авторськими колективами; 2) гейткіперами науки — редакторами і рецензентами, 3) аудиторіями.</jats:p>
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Модель фахової комунікації за посередництвом наукового журналу
|
[
"Фіялка С. Б. "
] |
https://doi.org/10.20535/2522-1078.2021.1(9).240613
| 2,021
|
December
|
10.20535/2522-1078.2021.1(9).240614
|
<jats:p>Пандемія COVID-19 спричинила низку змін в усіх галузях економіки та у життєдіяльності населення всіх країн світу. Впровадження різного типу обмежень (повсякденних карантинних та так званих локдаунів, коли діяльність великої кількості бізнесів фактично була паралізована), зростання кількості хворих спричинили неминучу кризу, в якій опинилися як державні установи, так і комерційні організації. Вимоги сучасності стали каталізатором до адаптації компаній до нових умов, у тому числі пристосування маркетингово-комунікаційних стратегій до змін на ринку. У статті на прикладі кейсів двох українських мережевих компаній із найбільш постраждалих від пандемії галузей («Епіцентр» та заклади громадського харчування Дмитра Борисова) розглянуто кризові реакції з використанням різних комунікаційних прийомів.</jats:p>
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Зміна парадигми кризових комунікацій у період пандемії COVID-19 (на прикладі України)
|
[
"Фісенко Т. В. "
] |
https://doi.org/10.20535/2522-1078.2021.1(9).240614
| 2,021
|
December
|
10.20535/2522-1078.2021.1(9).248774
|
<jats:p>У статті йдеться про історичні аспекти становлення TEDх в Україні як осередка міжнародної конференції TED, з’ясовано тематику і локацію виступів спікерів. Авторами дослідження зазначено, що в українському середовищі з’явився запит на інноваційний формат подачі ідей, які здатні змінювати суспільні процеси. Проаналізовано джерела науковців щодо використання інформації TED-конференцій та TEDх-подій у науково-освітньому процесі. Зазначено, що спікерами TEDх в Україні були не тільки відомі публічні особи, а й представники різних сфер діяльності, які виявили свою небайдужість та бажання розвивати українське суспільство.</jats:p>
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Конференція TEDх в Україні: історія та перспективи розвитку
|
[
"Романченко І. Г. ",
"Литвин А. В. "
] |
https://doi.org/10.20535/2522-1078.2021.1(9).248774
| 2,021
|
December
|
10.20535/s0021347021090016
|
<jats:p>Представлено методику оцінювання статистичних характеристик поля випромінювання апертурних антен із довільною формою розкриву, амплітудно-фазового розподілу та кореляційної функції фазових помилок, зручну для аналізу статистики антенних решіток з осьовою симетрією. На прикладі циліндричної кругової антенної решітки визначені основні середні та флуктаційні характеристики в межах прямої зовнішньої задачі статистичної теорії антен. Проведено оцінювання середньої діаграми спрямованості за потужністю та дисперсії відведення напрямку головного максимуму решітки та порівняння з відомими результатами. Показано, що за оціненими статистичними характеристиками кругові циліндричні решітки займають проміжне положення між лінійними та кільцевими.</jats:p>
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Оцінювання статистичних характеристик антенних решіток з осьовою симетрією за умови малих фазових помилок
|
[
"Замятин Вадим Иванович ",
"Левагин Геннадий Андреевич ",
"Чепига Валерий Николаевич ",
"Шевченко Антон Федорович "
] |
https://doi.org/10.20535/s0021347021090016
| 2,021
|
December
|
10.20535/s002134702109003x
|
<jats:p>В статье рассмотрена адаптивная антенная решетка (ААР), весовые коэффициенты которой совмещены с весовыми коэффициентами части эквалайзера без обратной связи, а выходной сигнал комбинируется с выходным сигналом части эквалайзера с обратной связью. Такие решетка и распределенный эквалайзер функционируют как единый многоканальный адаптивный фильтр, обеспечивающий прием полезного сигнала в условиях его многолучевости и наличия сигналов источников внешних помех. Представлены архитектура антенной решетки/эквалайзера, математическое описание многоканальных адаптивных алгоритмов его работы: рекурсивного алгоритма по критерию наименьших квадратов RLS (Recursive Least Mean Squares) на основе леммы об обращении матрицы MIL (Matrix Inversion Lemma), QR-разложения и преобразования Хаусхолдера с квадратичной вычислительной сложностью, а также простых алгоритмов по критерию наименьшего квадрата LMS (Least Mean Square), нормализованного LMS-алгоритма NLMS (Normalized LMS) и алгоритма аффинных проекций AP (Affine Projection) с линейной вычислительной сложностью. Результаты моделирования линейной антенной решетки с числом антенн/каналов, равным восьми, принимающей полезный сигнал 16-PSK, прошедший через двухлучевой канал связи, при наличии от одного до четырех источников помех с отношением сигнал–помеха (ОСП) –30 дБ по каждой помехе, при отношении сигнал–шум (ОСШ) в каналах решетки 10–30 дБ, демонстрируют эффективность предлагаемого решения.</jats:p>
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Антенная решетка и эквалайзер с обратной связью как единое адаптивное устройство
|
[
"Джиган Виктор Иванович "
] |
https://doi.org/10.20535/s002134702109003x
| 2,021
|
December
|
10.20535/s0021347021090053
|
<jats:p>Проанализированы параметры элементов структурной схемы фазированной антенной решетки Ка диапазона, включающей аналоговые ферритовые и дискретные полупроводниковые фазовращатели, блок управления и систему распределения мощности.
Предложен способ настройки фазирующих элементов решетки, использование которого позволяет значительно упростить и удешевить их производство. Экспериментально исследована эффективность предложенного способа настройки на примере 9-элементной линейной фазированной антенной решетки, что позволило проверить предположение об учете неидентичности фазовых характеристик элементов в ее каналах, и их влияние на параметры диаграммы направленности. Методика настройки также учитывает влияние электрических характеристик обтекателя или радиопрозрачного укрытия в случае их наличия.
Суть методики заключается в том, что все излучающие элементы антенны, кроме центрального канала, в котором фазовращатель отсутствует, закрываются радиопоглощающим материалом. Затем путем подбора вида и величины сигналов управления максимум диаграммы направленности ориентируется в направлении излучателя, находящегося в дальней зоне. Найденный сигнал управления запоминается. По одному открывая раскрывы других излучателей и настраивая их, получаем матрицу сигналов управления для заданного сектора сканирования. Таким образом формируется матрица управления фазовращателями, и при сканировании дополнительные вычислительные устройства не нужны. В результате проведенных экспериментальных исследований на примере 9-элементной линейной фазированной антенной решетки с использованием предложенной методики показано, что неидентичность параметров элементов СВЧ не влияет на быстродействие и точность установки фазового распределения в раскрыве антенны.</jats:p>
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Исследование и методика настройки фазированной антенной решетки Ka-диапазона
|
[
"Мальцев Сергей Борисович ",
"Щербаков Николай Всеволодович ",
"Войтович Олег Антонович ",
"Веселовська-Майборода Ганна Богданівна ",
"Лабазов Сергей Михайлович ",
"Линкова Анна Михайловна "
] |
https://doi.org/10.20535/s0021347021090053
| 2,021
|
December
|
10.20535/s0021347021090065
|
<jats:p>Совместную работу двух цифровых систем тропосферной связи (ЦСТС) можно быстро реализовать с помощью адаптивного сигнального управления одновременно на обеих станциях. Такое управление возможно организовать с помощью адаптивного алгоритма моделирования линии тропосферной связи (ЛТС) путем использования ЦСТС и контроля сигналов на выходе и входе адаптивных антенн (АдА), адаптивных передатчиков (АдП) и адаптивных приемников (АдПр) на каждой станции. Авторами использован современный цифровой тропосферный модем (ЦТМ) на одной станции и адаптивная обработка сигналов на основе специального цифрового блока управления (СЦБУ) на другой станции. В результате, адаптивное сигнальное управление одновременно на обеих станциях стабилизирует уровни тропосферных сигналов на этих станциях, что обеспечивает нормальную информационную надежность ЛТС с ЦСТС различной модификации при их совместной работе.</jats:p>
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Адаптивный цифровой тропосферный модем для линии тропосферной связи с двумя станциями тропосферной радиосвязи различных модификаций
|
[
"Рудаков В. И. ",
"Ковбасюк Александр В. ",
"Костина Олег Н. ",
"Орел Виктор Н. ",
"Башкиров Александр Н. ",
"Бычков Антон Н. "
] |
https://doi.org/10.20535/s0021347021090065
| 2,021
|
December
|
10.20535/s0021347021110042
|
<jats:p>В статье показаны высокие потенциальные возможности акустооптической линии задержки (АОЛЗ) для обработки широкополосных аналоговых сигналов. Обоснована актуальность разработки теории физических процессов в АОЛЗ, пригодной для прикладных применений. Предложен аппроксимационный метод решения этой проблемы. Показано, что при использовании кусочно-линейной аппроксимации, расчет временных и частотных характеристик АОЛЗ значительно упрощается. Получены универсальные формулы для определения выходного отклика АОЛЗ, его длительности и времени нарастания, при различных соотношениях длительности входного импульса и времени пересечения лазерного пучка упругим волновым пакетом. Предложена методика и формулы для определения частоты среза АОЛЗ. Проведено численное моделирование предложенных формул и доказана их адекватность. Обсуждена возможность использования полученных формул для исследования характеристик АОЛЗ за пределами граничной частоты. Установленные закономерности и результаты численного анализа экспериментально апробированы на макете АОЛЗ с прямым детектированием. Параметры осциллограмм входного и выходного импульсов, которые получены при различных соотношениях длительности входного импульса ко времени пересечения лазерного пучка упругим волновым пакетом, обсуждены в контексте установленных закономерностей и результатов численного анализа. По нормированному экспериментальному графику амплитудно-частотной характеристики АОЛЗ определена частота среза и показано ее соответствие с результатами численного анализа.</jats:p>
|
Аппроксимационный метод исследования характеристик акустооптической линии задержки
|
[
"Гасанов Афиг Рашидович ",
"Гасанов Руслан А. ",
"Ахмедов Р. A. ",
"Садыхов М. В. "
] |
https://doi.org/10.20535/s0021347021110042
| 2,021
|
December
|
10.20849/ijsn.v6i4.948
|
<jats:p>Introduction: The aging of China's population has further deepened, and according to the results of the seventh national census, the population aged 60 years and above in China was 264.02 million, accounting for 18.70% (China.2021).The rapid growth of the elderly population has led to an increase a geriatric orthopedic morbidity. The hip fracture is one of the common orthopedic diseases, which has posed a severe threat to the elderly's life and health (Yu, 2019).Purpose: In this study, we investigated the domestic and international literature, focusing on the analysis of DVT nursing prevention programs for elderly patients after hip arthroplasty, and proposed the current nursing research progress in preventing DVT to help elderly patients actively cope with DVT, improve the quality of life in later life, and make DVT a truly preventable disease.Method: Electronic searches using scholarly databases were employed and only significant articles that met the review objective were utilized.Findings: Currently, the main treatment option for hip fracture patients in clinical practice is surgery, and how to prevent Deep Vein Thrombosis (DVT) is an important task in the postoperative care of elderly orthopedic patients (Li, 2016). Research studies have shown that all elderly patients are at a very high risk of DVT during hospitalization, but the current trend is that 50% of patients at high risk of thrombosis are still not actively and effectively prevented from developing thrombosis for various reasons.Conclusion: This disease, which has a high incidence, a high mortality rate, and is difficult to prevent, requires increased attention and necessitates exploration to derive effective nursing intervention programs and related nursing measures to prevent reduce the formation of DVT and alleviate suffering for patient (Xu, 2016).In this review, we summarized the main nursing methods for preventing deep vein thrombosis of the lower extremities after hip fracture surgery in the elderly. Elderly patients are a special group of people, both physically and psychologically in a relatively fragile state, especially after the operation, so they need to be more careful in nursing work. In addition to general physical care, the care of their psychological state is also extremely important. This article describes in detail the physiological and psychological nursing interventions for patients, which can effectively guide and help medical staff to cope with the clinical care of such patients, and enable patients to better recover from surgery and trauma, and obtain a good prognosis.</jats:p>
|
Research Progress of Nursing Care for Elderly Patients With Complicating Postoperative Hip Fracture Deep Vein Thrombosis in China
|
[
"Zheng Dandan ",
"Cheng Wentao ",
"Wu Heyu ",
"Wu Haichao ",
"Cao Yuqi "
] |
https://doi.org/10.20849/ijsn.v6i4.948
| 2,021
|
December
|
10.20888/ridpher.v7i00.15957
|
<jats:p>Um dos objetivos deste texto é registrar aspectos do processo de reestruturação da Escola de Aplicação da Faculdade de Educação da Universidade de São Paulo (EAFEUSP) no período de 1998 a 2001, interrogando dimensões do universo escolar e as especificidades que caracterizam uma “escola de aplicação”. Inscrita numa perspectiva de pesquisa biográfica em educação, a análise proposta dialoga com momentos críticos da historia da EAFEUSP e ancora-se na experiência da autora como sua diretora nesse período. Os temas abordados abrangem aspectos da organização e funcionamento interno da escola – trabalho coletivo, progressão da aprendizagem – e aspectos das relações desta com o seu entorno territorial e acadêmico, refletindo sobre o seu papel nas pesquisas educacionais e na formação de professores.</jats:p>
|
Escola de Aplicação da Faculdade de Educação da USP
|
[
"Galvão Izabel "
] |
https://doi.org/10.20888/ridpher.v7i00.15957
| 2,021
|
December
|
10.20944/preprints202112.0472.v1
|
<jats:p>An adaptor signature can be viewed as a signature concealed with a secret value and, by design, any two of the trio yield the other. In a multiparty setting, an initial adaptor signature allows each party create additional adaptor signatures without the original secret. Adaptor signatures help address scalability and interoperabity issues in blockchain. They can also bring some important advantages to cryptocurrencies, such as low on-chain cost, improved transaction fungibility, and less limitations of a blockchain&rsquo;s scripting language. In this paper, we propose a new two-party adaptor signature scheme that relies on quantum-safe hard problems in coding theory. The proposed scheme uses a hash-and-sign code-based signature scheme introduced by Debris-Alazard et al. and a code-based hard relation defined from the well-known syndrome decoding problem. To achieve all the basic properties of adaptor signatures formalized by Aumayr et al., we introduce further modifications to the aforementioned signature scheme. We also give a security analysis of our scheme and its application to the atomic swap. After providing a set of parameters for our scheme, we show that it has the smallest pre-signature size compared to existing post-quantum adaptor signatures.</jats:p>
|
Post-Quantum Two-party Adaptor Signature Based on Coding Theory
|
[
"KLAMTI Jean Belo ",
"HASAN M. Anwar "
] |
https://doi.org/10.20944/preprints202112.0472.v1
| 2,021
|
December
|
10.20948/prepr-2021-104
|
<jats:p>This paper compares two approaches to determining road markings from video sequences, namely, the method of finding the markings using geometrized histograms and the method based on neural networks. An independent open dataset TuSimple is used to conduct a comparative analysis of the algorithms. Since the investigated methods have different architectures, their work is evaluated according to the following metrics: Accuracy, speed (relative FPS), general computational complexity of the algorithm (TFlops).</jats:p>
|
Comparative analysis of the geometrized histogram method and the neural network method for road markings recognition
|
[
"Podoprosvetov Aleksei Valerievich ",
"Anokhin Dmitry Anatolevich ",
"Kiy Konstantin Ivanovich ",
"Orlov Igor Aleksandrovich "
] |
https://doi.org/10.20948/prepr-2021-104
| 2,021
|
December
|
10.20950/1678-2305/bip.2021.47.e649
|
<jats:p>Previous study of this research group revealed that water from the Billings reservoir (Brazil) intended for human use (water supply and seafood) has microbiological contamination and causes lethality and brain and behavioral impairments in zebrafish. The objective of this study was to understand what have induced these impairments in the animal model. Chemical analyses on water samples from Rio Pequeno (RP), Rio Grande (RG), and Bororé (BO) rivers, as well as chemical and morphological analyses on zebrafish gills exposed to those waters were performed. Waters samples from RP, RG, and BO presented high levels of phosphorus. BO water and fish gills exposed to this water presented high levels of nitrogen. RG water caused potassium contamination in gills. Phosphorus, nitrogen, and potassium are indicators of anthropogenic pollution. RG water and fish gills exposed to this water presented low levels of calcium, which might be an indication of chemical imbalance that could lead to health problems in aquatic animals. RG and BO waters resulted in zirconium contamination in gills. BO water induced respiratory lamellae thickening in the gills, which may be the underlying mechanism for the observed hypoxia. In conclusion, behavioral, brain, and respiratory defects observed previously were induced by chemical and morphologicalb disturbances due to anthropogenic pollution in the Billings reservoir.</jats:p>
|
BILLINGS RESERVOIR (BRAZIL): CHEMICAL STUDIES ON WATER AND CHEMICAL AND MORPHOLOGICAL STUDIES ON ZEBRAFISH GILLS
|
[
"LEME Ednilse ",
"DUTRA-CORREA Maristela ",
"RODRIGUES Paula da Silva ",
"SMITH Welber Senteio ",
"BERNARDI Maria Martha ",
"KIRSTEN Thiago Berti "
] |
https://doi.org/10.20950/1678-2305/bip.2021.47.e649
| 2,021
|
December
|
10.20961/prima.v5i2.54635
|
<jats:p><p><em><strong>Utilization of Eggshell Waste As Liquid Organic Fertilizer in Rumbai Bukit District.</strong> </em>Eggshell waste can be used for the manufacture of liquid organic fertilizer. Eggshells can come from laying hens farm waste and household kitchen waste. The utilization of liquid organic fertilizer (POC) from eggshell waste is done to minimize environmental pollution. In addition, eggshell waste recycling has economic value. The activity of making liquid organic fertilizer was carried out by 10 Kukerta students, Riau University. The location for making liquid organic fertilizer is in the yard of Mr. Masdi's house, the chairman of RW 7, Rumbai Bukit District. The method of making liquid organic fertilizer is by fermentation for 10 days at a temperature of around 40<sup>o</sup>C. The materials used are eggshells, EM4 solution, brown sugar, and water, while the tools needed are a basin, a bottle, a grinder, and a thermometer. The purpose of this program is to increase the knowledge of the residents of Rumbai Bukit on the benefits of eggshell waste in making POC. So far, eggshell waste has only been piled up on vacant land belonging to the village and as a source of air pollution. Making POC from 1 kg of eggshell powder produced 500 ml. During the practice, 7 bottles of POC were produced containing 500 mL per bottle with a capital of Rp. 5,000 per bottle. POC testing on chili and papaya plants planted in people's yards was carried out with qualitative observations of the leaves which showed wider leaves than plants that were not given POC. The results of the participation questionnaire to increase the knowledge and skills of the RW 7 Rumbai Bukit community in participating in activities and developing POC manufacturing increased by 87.5%. This outreach activity adds to the value of eggshell waste every 1 kg after it becomes a POC, which is sold for a profit of Rp. 10,000. Utilization of eggshell waste as POC can increase the economy of the Family Welfare Development (PKK) women's group by 50%.</p></jats:p>
|
Pemanfaatan Limbah Cangkang Telur sebagai Pupuk Organik Cair di Kecamatan Rumbai Bukit
|
[
"Hasibuan Saberina ",
"Nugraha Muhammad Rafi ",
"Kevin Aufa ",
"Rumbata Novan ",
"Syahkila Syahkila ",
"Dhewanty Sekar Asmara ",
"Fadillah Muhammad Fajar ",
"Kurniati Maya ",
"Trilanda Nana ",
"Afifah Sherina Nur ",
"Shafira Tevania "
] |
https://doi.org/10.20961/prima.v5i2.54635
| 2,021
|
December
|
10.20998/2078-5364.2021.4.06
|
<jats:p>In the present article importance of adsorptive purification of vegetable oils is shown as the most responsible technological stage. Insufficiency of scientific developments in the scope of domestic sorbents in Ukraine is pointed out. The phytosorbent with nanotubes from sunflower peel improving some quality parameters of non-refined sunflower and soybean oils to standard values for refined oils has been offered.
Some literature data on the main characteristics of a number of sorption materials (carbonaceous, natural, fibrous, and sorbents obtained from agricultural waste - Corylus avellana Lambert nuts) as a result of heat treatment are analyzed. The main sorption properties are considered; dignity; limitations. The effect of temperature on the productivity of pyrolysis of plant raw materials and the properties of the resulting carbonizates in the temperature range 150-600 °C was investigated. The duration of exposure of materials at the final temperature of the process in all experiments was the same and amounted to 1 h. Analysis of the experimental data allows us to conclude that temperature is the main factor affecting the process of carbonization of the initial plant material. Regardless of the pyrolysis atmosphere, the yield of the product from plant raw materials decreases with a significant increase in temperature. At present, the main raw material for the industrial production of adsorbents is in many studies organic substances - wood, fossil coal, peat, remnants of the processing of agricultural raw materials due to their low cost and large amount. Solving the problem of creating sorbents based on plant raw materials with the inclusion of hydrated fullerenes in their composition solved the problem of creating sorbents and environmental problems, since the waste did not always find a useful application. Concentration of water solution of hydrated C60, fast C60FWS, є molecular-coloidal systems and spherical fractal clusters, structural unit of which is micro-hydrophilic, high-hydrophilic supramolecular complex, molecules can be folded to fit into ) 24-hydration of fullerene C60 (C60HyFn). The hydrated cultivation is set in its own well-ordered, structurally heterogeneous watery middle, in which the directness and kinetics of chemical processes are seen in such, that it is necessary to be washed in order to clean.</jats:p>
|
TECHNOLOGICAL ASPECTS OF APPLICATION OF THE PHYTOSORBENT WITH NANOTUBES IN THE PROCESS OF ADSORPTIVE OIL PURIFICATION
|
[
"Krichkovskaya L. ",
"Elnaggar Essam ",
"Dubonosov V. "
] |
https://doi.org/10.20998/2078-5364.2021.4.06
| 2,021
|
December
|
10.20998/2078-5364.2021.4.09
|
<jats:p>The aim of the paper is to assess dynamics of water quality in four main recreational areas in Kharkiv and to develop recommendations for water quality improvement. Methods. Field and laboratory methods and analytical data processing. Results. The paper presents analysis of dynamics in water quality for four main recreational areas located in Kharkiv: Zhuravlevskiy Hydropark, Oleksiivskiy Lugopark, Udyanskiy Hydropark and Osnovyanske Lake. Period of study: 2006-2020, time: May-June and August-September. Average data are presented. Samples were analysed at certified Laboratory of Analytical Chemical Research of the Karazin Institute of Environmental Sciences. Laboratory data were compared with national UA standards and European ones. Conclusions were made for the following key parameters: dissolved oxygen and BOD5, total mineralization, biogenic substances content, oil products and surfactants, toxic heavy metals content. There is no specific dynamics on the pollution level. Conclusions. The following recommendations for improvement of water quality were developed: (i) to preform regular monitoring of water quality; (ii) to introduce regular and systematic control by one local authority; (iii) to improve infrastructure of recreational areas; (iv) to introduce regular cleaning of the recreational areas; (v) to install bio-WC; (vi) to install additional waste containers (preferably with separate waste collection); (vii) plant trees for better isolation from highways; (viii) to improve level of water treatment on WWTP; (ix) to create nature protected areas along rivers</jats:p>
|
SURFACE WATER QUALITY IN KHARKIV RECREATIONAL AREAS: 2006-2020
|
[
"Utkina K. ",
"Garbuz A. ",
"Kulyk M. "
] |
https://doi.org/10.20998/2078-5364.2021.4.09
| 2,021
|
December
|
10.20998/2078-774x.2021.02.01
|
<jats:p>The high efficient design of the radiation-convective recuperator with secondary emitters have been proposed, in which due to the rational arrangement of heating surfaces, as well as due to the installation of secondary emitters in flues, an increase in heat perception is transmitted to the secondary heat carrier – preheating air. High efficiency of air preheating is provided by two-stage heating: 1st stage of heating – the internal air ring channel with bilateral heating which is washed by combustion products from the parties of the central cylindrical and peripheral ring channels of combustion products; 2nd stage of heating – the external air ring channel in which unilateral heating by products of combustion from the peripheral ring channel of products of combustion is organized. Inner and outer annular air ducts (tanks), interconnected by bypass pipes. To increase the efficiency of heat transfer in the considered recuperator in the central channel of combustion products is placed emitter, which consisting of intersecting radial plates, and in the annular channel of combustion products are placed auxiliary emitters, which made in the form of flat radial edges. These emitters provide an increasing in total heat flux to the walls of the channels of the recuperator. On the basis of the conducted theoretical researches, engineering calculations and CFD – modelling the characteristics of operation of the recuperator for its installation on the furnace of secondary smelting of aluminium are defined. The main advantages of the new design of recuperator are high thermo-hydraulic efficiency, compactness and low metal consumption, ease of installation on the furnace and no need for placement in separate chimneys. It is established that the recuperator provides air heating ta,ex ~ 400 °C at an acceptable aerodynamic drag (pressure drop) on the air track (∆pa ~ 1000 Pa). Appropriate design documentation has been developed for the manufacture of the recuperator, which is installed on a pilot furnace of secondary aluminium smelting by California Die Casting (USA).</jats:p>
|
Development of Highly Efficient Radiation-Convective Recuperator for Furnace of Secondary Aluminum Melting
|
[
"Vorobiov Mykyta ",
"Zgurskyi Volodymyr ",
"Prokofiev Alexey ",
"Gubatyk Ruslan "
] |
https://doi.org/10.20998/2078-774x.2021.02.01
| 2,021
|
December
|
10.20998/2078-774x.2021.02.06
|
<jats:p>At the present stage of the development of technology, it is necessary to ensure the strength, reliability and durability of the structure that successfully functions under conditions of high-temperature heat exchange as maximum as possible. In this regard, graphite structural elements are widely used, and they are also applied for parts of space and aircraft, jet and rocket engines. The transversely isotropic graphite cylinder used in this work has a unique set of qualities that make it indispensable for problems in nuclear physics and power engineering; however, in the calculation of thermal engineering practice, it has not been studied enough, since it contains a large scatter of thermophysical characteristics for various grades of graphite. The aim of the study, including the basis of the developed method for solving boundary value problems of doubly nonlinear unsteady thermal conductivity, is to consider the effect of temperature dependences of the thermophysical characteristics of the material on temperature, zonal radiative-convective heat transfer and anisotropy on the distribution of temperature fields along the length, at the center and surface of a semi-infinite solid cylinder. The essence of this method is that the Goodman’s and Kirchhoff’s transformations are applied to the problem posed converted to a dimensionless form, then the relative temperature and functions from it, are expanded in the series of sines on the a priori interval, then the superposition principle is applied, after which the original setting is converted to a set of linearized problems with reduced thermophysical characteristics. Linear problems are solved by the method of integral transformations, which are summed up. The upper limit of the priori interval is determined from the condition that the relative temperature obtained from the solution of the problem Fo ® ¥ takes the value of the upper limit of the a priori interval. A large number of numerical calculations in the Matlab environment graphically show changes in the relative temperature on the axis and surface of the cylinder in a wide range of Fourier criteria. It is found that with an increase in the Fourier criterion, the character of heating changes qualitatively from the axis to the surface of the cylinder, both in terms of nonlinearities and anisotropy. For the case of double nonlinearity, the location of the temperature fields at different anisotropies in comparison with an isotropic material is shown graphically.</jats:p>
|
The Calculation of Double Nonlinearity and Material Anisotropy Influence on the Temperature Distribution in the Cylinder Under High Temperature Heat Exchange
|
[
"Zaytsev Yevgenij "
] |
https://doi.org/10.20998/2078-774x.2021.02.06
| 2,021
|
December
|
10.20998/2078-774x.2021.03.04
|
<jats:p>Today, the world oversees an explosive development of the nuclear power stations (NPS) of a low power. Most projects deal with pressurized water reactors and as a matter of fact with steam generators (SG). Ukraine has a well-developed engineering industry backbone that can be used for the production of the equipment required for the nuclear power plants of a low power. This scientific paper delves into the computations of the strength of elements used for the monotube steam generator with cylindrical coils that is the most presentable of all the projects in question in IAEA materials. Appropriate methods were developed to perform structural computations and steam generator strength computations. The mathematical model was developed that allows us to perform strength computations of the SG elements making use of the analytical method with reference to the Regulations and do simulations using the ANSYS software code. The specified elements include the body elements, in particular the cylindrical part, the flange, the bottom and the cover, including the heat carrier branch pipe and heat exchange tubes. The comparison of the data obtained by both methods showed their similarity and accordingly, the accuracy of the data that are indicative of the need for an increase in the wall thickness of the cylindrical part of the external branch pipe intended for the heat carrier. The body bottom strain for calculated dimensions exceeds the permissible value by 1.56 %. Since this value is 5 % lower than permissible values it is deemed that the strength condition is passed through. The simulation proved that the strength conditions are met for heat exchange tubes, for the body, the body cover, the body flange, the conical part of the external branch pipe intended for the heat carrier. Based on the analysis done, we would like to recommend performing strength computations using the normative method with the subsequent check out by the simulation using the computer code.</jats:p>
|
Steam Generator Strength Computation for Nuclear Electric Power Plants of a Low Power
|
[
"Kravchenko Volodymyr ",
"Lymarenko Oleksandr ",
"Xiaolong Zhou ",
"Khromiy Kiril ",
"Buchka Yehor "
] |
https://doi.org/10.20998/2078-774x.2021.03.04
| 2,021
|
December
|
10.20998/2078-774x.2021.03.05
|
<jats:p>Extending the life of nuclear power plants in Ukraine during in the super-project period, as in most countries operating nuclear power units, is an accepted strategy and is being implemented practically. In this regard, there is a need for verification calculation of the main elements The calculated analysis of the stress-strain state of the heat exchanger is carried out using the finite element method of power equipment that determine the resource characteristics. The technical condition of the emergency cooling heat exchanger for the power unit no. 3 of the SUNPP has been evaluated. The analysis of design, technical and operational documentation in the amount of preliminary evaluation of technical condition was performed. Potential mechanisms of wear of heat exchanger elements were determined. The technique of carrying out verification calculations for static, cyclic and seismic stability was described. The emergency cooling heat exchanger calculation model is made in the APM Structure 3D calculation code. The tense-deformed state of the heat exchanger is calculated using the finite-element method of resampling the design region. The results of the verification calculation of the emergency cooling heat exchanger in the calculated states corresponding to normal operating conditions, hydrotests and under seismic impacts in conditions of the maximum design earthquake were presented. The correspondence of the actual stresses in the calculation zones of the heat exchanger to the permissible values, specified in the current regulatory documentation was established. The amount of damageability to the heat exchanger elements was determined for the permissible number of load cycles. The cyclical strength of the elements of the emergency cooling heat exchanger, taking into account the period of application equal to 60 years inclusive, is ensured in accordance with the requirements.</jats:p>
|
Assessment of the Technical Condition of the Emergency Heat Exchanger for the Reactor Plant of the B-320 Type in Order to Extend Its Service Life
|
[
"Konshin Valeriy ",
"Zaiats Mikola "
] |
https://doi.org/10.20998/2078-774x.2021.03.05
| 2,021
|
December
|
10.20998/2078-774x.2021.04.04
|
<jats:p>Due to the importance of the problems of implementing energy-saving technologies in modern conditions, one of the promising areas is the use of gas turbines for combined heat and power generation. One of the areas of effective development and technical re-equipment is the widespread use of highly economical combined steam and gas plants and gas turbines. The operation of the gas turbine unit “Aquarius” SE NPCG “Zorya-Mashproekt” with the injection of steam into the combustion chamber, which operates on the advanced cycle A-STIG and has in its circuit equipment for water regeneration, condensed from a vapor-gas mixture is considered. For condensation of steam from the vapor-gas mixture, a contact condenser-gas cooler is used, which is a mixing heat exchanger of complex design. The efficiency of heat transfer is determined by the design of the nozzle, namely, the developed heat transfer surface, small hydraulic supports, high heat transfer coefficients. An important aspect is the overall dimensions, which must be within certain limits. In the work it is offered to execute a design of the condenser in the form of a packed column. Different types of nozzles are considered to choose the best option. As a result of thermal design calculation of the contact capacitor, it is proposed to use Rashiga rings (15152) as a nozzle, which provide the lowest height of the nozzle at the required diameter of the device.</jats:p>
|
Selection of the Design of a Contact Condenser of a Gas-Steam Plant with Steam Injection into the Combustion Chamber
|
[
"Lytvynenko Oksana ",
"Myhaylova Irina "
] |
https://doi.org/10.20998/2078-774x.2021.04.04
| 2,021
|
December
|
10.20998/2078-774x.2021.04.06
|
<jats:p>When the casting roller is cooled or heated in the preconditioning chamber the water is supplied to its surface by flat-jet nozzles. The visual inspection of the model of the casting roller showed that a considerable part of it can be covered with the water film spreading from sprinkling zones. It was established that the heat conductivity in the roller body is considered to be a crucial thermal preparation factor in the conjugate heat-exchange problem for the roller of a large diameter at Bio criterion values exceeding 20. Hence, it is sufficient to provide an essential level of the heat transfer that corresponds to the heat transfer coefficient of 2000 W/(m2∙K) to provide appropriate operating conditions for the thermal preparation of the roller. The conditions are also met in sprinkling zones. Due to this fact this scientific paper studies the heat exchange conditions under the water film that spreads between the adjacent sprinkling zones. A range of changes in the flow rate of the spreading water film was determined experimentally. The conditions of heat exchange between the surface of alpha-calorimeter and the water film were analyzed depending on its flow rate and the heat meter surface temperature. A generalized correlation equation was derived. It was established that the heat exchange intensity in sprinkling zones and under the spreading water film meets technological roller treatment conditions in the preconditioning chambers. The obtained research data can be used for the rational arrangement of the collectors and flat-jet nozzles in casting roller preconditioning chambers to reduce the cold and hot water consumption and cut down operating costs.</jats:p>
|
Experimental Studies of the Heat Exchange Between the Water Film and the Casting Roller in the Thermal Preconditioning Chamber
|
[
"Pereselkov Alexander ",
"Kruglyakova Olga "
] |
https://doi.org/10.20998/2078-774x.2021.04.06
| 2,021
|
December
|
10.20998/2079-0775.2021.1.07
|
<jats:p>The article is devoted to an overview of the scientific and pedagogical activities of a prominent scientist in the field of engine building and mechanical engineering, one of the organizers of the higher school of Ukraine, a public figure, Professor Ya. M. Mayer. In the biographical work, the first study of complex life path and versatile creative heritage of the last rector of Kharkiv Technological Institute, the founder and director of the Ukrainian Research Institute of Internal Combustion Engines, director and scientific leader of the Ukrainian Research Aviation Diesel Institute, one of the creators of the famous V-2 diesel engine, one of the heads of the department «Theory of Mechanisms and Machines» Yakov Moiseevich Mayer.
Keywords: engine; engineering science; higher technical education; Ya. M. Mayer; KhPI; scientific school; SE “KhKBD”; diesel</jats:p>
|
MAIN WORKS OF PROFESSOR YA. M. MAYER (A REVIEW)
|
[
"Nazarenko Sergej ",
"Tkachuk Mykola А. ",
"Marusenko Svitlana "
] |
https://doi.org/10.20998/2079-0775.2021.1.07
| 2,021
|
December
|