bluuebunny/crossref_metadata_2025_split huggingface dataset:
Underwater autonomous thruster as a way to navigate a vessel in confined waters
Authors: Бурылин Я.В. 
Published: March 2024

Основой безопасной и эффективной проводки судна в стесненных условиях портовой акватории узостей, проливов, рек, шлюзов и доков является обеспечение пропульсивными и рулевыми установками судна его достаточной маневренности. Как правило крупнотоннажные грузовые суда, обеспечивающие 80% мирового грузооборота оборудованы одним винторулевым комплексом, расположенным на корме. Для повышения маневренности таких судов применяют буксиры-кантовщики в основных режимах работы «на битенг» или «на укол». Если акватория порта позволяет, то практически любое крупнотоннажное судно может быть безопасно поставлено к причалу с использованием четырех конвенционных буксиров-кантовщиков при допустимых для порта условиях окружающей среды. В случае, когда акватории порта недостаточно для вмещения судна и кантующих его буксиров, швартовка невозможна. В настоящей статье предлагается концепт подводного подруливающего устройства, крепящегося к днищу грузового судна. Такое устройство не требует дополнительной акватории для повышения мобильности судна и позволяет заводить суда в акватории, соизмеримые по ширине с шириной самого судна, что позволит повысить количество причальных мест на единицу площади портовой акватории и существенно повысить грузооборот порта.
The basis for safe and efficient navigation of a vessel in the cramped conditions of port waters such as narrow passages, straits, rivers, locks and docks is to ensure the vessel’s propulsion and steering installations provide sufficient maneuverability. As a rule, large-capacity cargo ships, providing 80% of the world's cargo turnover, are equipped with one rudder complex located at the stern. To increase the maneuverability of such vessels, tilt tugs are used in the main modes of operation: “biting” or “punching”. If the port water area allows, then almost any large-capacity vessel can be safely berthed using four conventional berthing tugs under environmental conditions acceptable for the port. In cases where the port water area is not sufficient to accommodate the vessel and its tugboats, mooring is impossible. This paper proposes a concept for an underwater thruster attached to the bottom of a cargo ship. Such a device does not require additional water area to increase the mobility of the vessel and allows ships to be launched in water areas comparable in width to the width of the vessel itself, which will increase the number of births per unit area of the port water area and significantly increase the port's cargo turnover.
Parametric analysis of stability of ship nonlinear automatic control systems
Authors: Грушун А.И. , Грушун Т.А. , Осадченко А.Е. 
Published: March 2024

Рассматривается алгебраический метод построения областей абсолютной устойчивости судовых нелинейных систем автоматического управления (САУ) на основе критерия В.М. Попова и метода D-разбиения. Классическая реализация этих методов требует построения частотного годографа D-разбиения и кривой Попова. Эти годографы имеют нерегулярный характер изменения, и для сложных систем их построение может превратиться в существенную проблему, связанную с выбором шага изменения и максимального значения частоты. В свою очередь, для решения задачи нужны годографы не в целом (не во всем диапазоне частот), а лишь их отдельные точки, с помощью которых определяются границы искомых областей и значения необходимых параметров. Предлагается определять наличие этих точек по положительным вещественным корням специальным образом построенных алгебраических уравнений, что не требует перебора значений частотных характеристик, тем самым не требует их непосредственного построения. Вычисление положительных вещественных корней, в отличие от вычисления комплексных корней, не представляет сложности. Предлагаемое решение задачи позволяет полностью автоматизировать процесс получения результата, повысить сложность исследуемых нелинейных САУ и сократить временные затраты при построении областей абсолютной устойчивости..
We consider an algebraic method for constructing areas of absolute stability of shipboard nonlinear automatic control systems (ACS) based on the criterion of V.M. Popov and the D-partition method. The classical implementation of these methods requires the construction of a frequency hodograph of the D-partition and a Popov curve. These hodographs have an irregular behavior and for difficult systems their construction can turn into a significant problem associated with the choice of the step of change and the maximum frequency value. In turn, to solve the problem, hodographs are needed not as a whole (not in the whole frequency range), but only their individual points, with the help of which the boundaries of the desired areas and the values of the required parameters are determined. It is proposed to determine the presence of these points by positive real roots of specially constructed algebraic equations, that does not require enumeration of the values of the frequency characteristics, thus does not require their direct construction. Calculating positive real roots, unlike calculating complex roots, is not difficult. The proposed solution of the problem makes it possible to fully automate the process of obtaining the result, increase the complexity of the studied nonlinear ACS and reduce time costs when constructing areas of absolute stability.
Autonomous underwater vehicle navigation via sensors maximum-ratio combining in absence of bearing angle data
Authors: Дементьев К.В. , Альчаков В.В. , Мирянова В.Н. 
Published: March 2024

В данной работе предлагается схема объединения датчиков по методу разнесенного приема для использования расширенного фильтра Калмана в задаче позиционирования подводного аппарата с помощью устройств связи (буев), предоставляющих информацию о местоположении с помощью механизма наклонных дальностей, инерциальных датчиков, доплеровского лага и датчика давления при отсутствии данных об угле пеленга. Описаны методы оценки параметров всех компонентов навигационной системы. Представлены результаты имитационного моделирования с соответствующими метриками качества. Полученные данные позволили сформировать и оценить модель определения положения подводного аппарата, что по-прежнему является актуальной и сложной задачей для исследователей морского дна. Было показано, что объединение датчиков методом разнесенного приема позволяет сократить вектор состояния фильтра, что открывает новые возможности для повышения эффективности и быстродействия систем управления и навигации.
The paper proposes a maximum-ratio combining algorithm in the sensor fusion scheme for using an extended Kalman filter in the underwater vehicle positioning task by means of communication devices (buoys) providing location information using a slant-range mechanism, inertial measurement units, a Doppler velocity log, and a pressure sensor in the absence of bearing angle data. The parameter estimation methods for all navigation system components are described. The results of simulation modeling with corresponding quality metrics are presented. The obtained findings allowed to compose and evaluate a position determination model for the underwater vehicle, which is still a relevant and complex task for seabed explorers. It has been shown that the maximal-ratio combining algorithm for sensor fusion provides a reduction in the filter state vector, which opens up new opportunities for improving the efficiency and performance of control and navigation systems.
To the question of using existing design automated mooring devices in autonomous navigation
Authors: Заслонов В.В. 
Published: March 2024

В настоящей статье рассматривается проблема внедрения автоматизированных швартовных устройств в рамках опытно-конструкторской работы «Разработка системы управления и проектирование буксира-автомата» для обеспечения морских операций в связке с грузовым судном без участия человека. Были рассмотрены варианты конструкции разных разработчиков, которые были воспроизведены в системе объемного моделирования без магнитных и вакуумных устройств стыковки, так как в процессе отдельного эксперимента было проведено математическое сравнение в автоматической системе расчета рассматриваемых устройств и произведены имитации по распределению нагрузки, тепла и др., для того чтобы установить, что тип стыковки при морских операциях не влияет на вид конструкции швартовного устройства. Воспроизведенные конструкции, внедренные в эксплуатацию, были так же подвергнуты спектральным экспериментам, в ходе которых было выявлено, что существующие конструкции невозможно применять на борту судна для осуществления эскорта, раскантовки и швартовных операций по причине отсутствия необходимых технических и технологических возможностей, что отражается на безопасности. В свою очередь, была предложена и описана конструкция, удовлетворяющая критериям надежности, что установлено в ходе имитационных экспериментов при моделировании.
This article discusses the problem of the introduction of automated mooring devices in the framework of the experimental design work "Development of a control system and design of an automatic tug" to ensure maritime operations in conjunction with a cargo vessel without human participation. Design variants from well-known developers were considered, which were reproduced in a volumetric modeling system for visualizing processes and obtaining experimental data, and an automatic calculation system was developed to obtain statistical data during modeling. The essence of the experiment was to reproduce the loads in the models that would arise in cases of their use when unboarding, escorting, mooring a cargo ship by the developed automatic tugs. As a result of the experiment, the variants of the application of the most well–known methods of docking - vacuum and magnetic - were evaluated, the application of these methods in the process of sea maneuvers in the conditions of the introduction of marine autonomous surface vessels was evaluated. The conclusion of this article is the justified criteria for the design of a new automated mooring device, which formed the basis for the design of a mooring device, a variant of which is also proposed in this paper.
Investigation of the hydrodynamic impact between scientific boat hull and measuring equipment on a basis of numerical modeling of velocity fields
Authors: Чебан Е.Ю. , Лукина Е.А. , Кожевников А.И. , Капустин И.А. , Никущенко Д.В. 
Published: March 2024

Изучение гидрологии водоемов остается актуальной проблемой для решения большого круга практических задач. Одним из способов исследования полей скорости на водных объектах является применение ADCP – акустических доплеровских профилографов течений (Acoustic Doppler Current Profiler) различных модификаций и производителей. В настоящей работе представлены результаты исследования взаимного влияния корпуса маломерного научно-исследовательского тримарана и профилографа ADCP с помощью методов вычислительной гидродинамики. Исследовано влияние различных вариантов крепления ADCP на гидродинамику судна, а также получены вызванные скорости при движении тримарана, в том числе с различными вариантами размещения профилографа по длине и глубине судна. Выявлены области неблагоприятной интерференции потоков вокруг корпуса судна и измерительного оборудования. Предварительные оценки показывают, что величина корректировки измеряемых ADCP скоростей, может составлять 5-10% в зависимости от места его расположения. Полученные значения сопротивления и поля вызванных скоростей позволяют выбрать место расположения профилографа по длине судна, обеспечивающее минимизацию сопротивления и вызванных скоростей, влияющих на точность работы прибора. Результаты исследования могут быть использованы в практических целях для определения места и способа крепления ADCP на исследовательских судах.
Investigation of hydrology of reservoirs remains an important issue in solution of a wide range of practical problems. One of practical way to learn velocity fields around bodies could be to use different types of ADCP (Acoustic Doppler Current Profiler). The article presents the results of a research of the hydrodynamic interaction between the hull of a scientific boat and ADCP unit on a basis of numerical simulation of velocity fields. The influence of various ADCP mounting options on the hydrodynamics of the scientific boat was studied. The induced velocities during the movement of the trimaran were obtained, including influence of different locations of the profiler along its length and depth. Regions of unfavorable interference of flows around the hull and measuring equipment have been obtained. Preliminary predictions show that the amount of correction to the measured ADCP velocity could be about 5-10 % depending on its location along the hull. The obtained values of resistance and the field of induced velocities make it possible to select the location of the ADCP unit, ensuring minimization of resistance and induced velocities that affect the accuracy of the device. The results of the research could be used to practically determine the location and method of attaching ADCP on research vessels.
DINAMIKA KONFLIK SURIAH PADA MASA PEMERINTAHAN BASHAR AL-ASSAD
Authors: Yuliansyah Yuliansyah , Syukur Syamzan , Susmihara Susmihara 
Published: March 2024

This paper departs from the conflict that occurred in Syrian City, so it makes the author interested in trying to understand the basic problems that are the cause of the conflict. In addition, the author also tries to see who the actors who played a role in the conflict are, as well as the impact that the Syrian conflict has on the international world. The Syrian conflict has been going on for forty years to date, and the conflict has not yet seen its end. Since March 2011 the conflict in Syria has claimed so many lives, thousands of people have been displaced, and thousands of children orphaned. Many houses collapsed, infrastructure and public facilities were destroyed due to the conflict. Data on the Syrian conflict is collected from books, journals, and the web. These data are then categorized, systematized, and analyzed according to the purpose of writing. This paper concludes that the cause of the conflict in Syria is not due to differences in religious sects but rather the political and economic interests of the opposition opponents of Assad and opposition-supporting countries. There are three actors who play a role in the Syrian conflict: President Bashar al-Assad and his supporters, the Syrian opposition, and the Jihadist group. The resulting impact of the Syrian conflict is the large number of casualties that have fallen and the problem of refugees. From the time of the conflict in March 2011 to April 2013, The death toll was 150,000. Meanwhile, the displaced population is 2.4 million people, which is dominated by women and children. Meanwhile, 4 million Syrians are homeless. For the international community, the Syrian conflict has an impact on the handling of refugees.
The expression of sehnsucht in the Japanese city pop revival fandom through visual media on Reddit and YouTube
Authors: Vichot Rhea 
Published: March 2024

Japanese city pop music, which emerged in the late 1970s through the late 1980s, saw a resurgence in interest in the late 2010s as an online revival fandom formed across multiple platforms. This emergent fandom has prompted scholars to ask why this fandom emerged and how this audience relates to music disconnected in time and place from themselves. Various forms of qualified nostalgia have been suggested to describe different modes of engagement with media of the past, although these terms are both semantically awkward and do not capture the case of engagement with media removed from the personal or generational past. However, sehnsucht, an alternative model of evaluating the past against the present, is better suited to describing the mode of connection between fans, music, and the past. A thematic analysis of visual media in a case study of conversations on the r/citypop subreddit and on YouTube reveals that city pop fans seem to cluster many of the themes of sehnsucht in their relationship to a musical genre from an idealized past removed from the austere present.
Ultrasonication and RSM-based optimization of antioxidant activity, saccharide composition and fatty acids from Phoenix dactylifera L. Medjool date seeds influenced by ethanol
Authors: Thirubuvanesvari-Duraivelu Pushpa , Salwa Abd Gani Siti , Hassan Masriana , Izuan Effendi Halmi Mohd , Fawaz Abutayeh Reem , A.A. Al-Najjar Mohammad , Abu-Odeh Ala’ 
Published: March 2024

In response with the demand in date industry finding on sustainable solution for date seeds management and its bioactive rich constituent, current study envisaged the optimum condition for the ultrasound extraction of Phoenix dactylifera L. Medjool date seeds and its antioxidative activity by employing a three-level three-factor Box–Behnken design via response surface methodology (RSM). Ethanol (EtOH) concentration (50-80%), time (30-90 min) and temperature (40-70 °C) were the independent variables investigated for ABTS•+ scavenging antioxidant activity and subjected to analysis of variance (ANOVA). The optimum conditions for maximum antioxidant activity (60.93% ± 0.021) were achieved at 80% EtOH, 44 min and at 57 °C, where the effect of EtOH concentration were notably significant. The observed agreement between the experimental (60.93% ± 0.021) and predicted (60.35%) values indicated the employed model suitability while substantiates the successful implementation of RSM for optimizing extraction parameters. The optimized extract characterized through UPLC-QTOF/MS and GC-MS/MS, detailed the presence of saccharides (isomaltose, mannotriose and stachyose) and volatile compounds, namely 5 saturated fatty acids that encompassed within the 8.42% (w/w) of total fat obtained. This verifies the ability of the solvent mixture extracting fatty acids and saccharides even under high EtOH concentration.
KEY WORDS: Date seeds, Response surface methodology (RSM), Antioxidant, Saccharide, GC-MS/MS, UPLC-QTOF/MS
Bull. Chem. Soc. Ethiop. 2024, 38(3), 547-562.
DOI: https://dx.doi.org/10.4314/bcse.v38i3.1
Synthesis and characterization of silver nanoparticles from Cocos nucifera L. male flowers: An investigation into their potent antibacterial and anticancer efficacy
Authors: K. Gatasheh Mansour 
Published: March 2024

The current research focused on the production of silver nanoparticles using dichloro methane-mediated Cocos nucifera male flower extract and their minimum inhibitory concentration against ten different bacterial pathogens. C. nucifera male flowers were extracted by 100% DCM, and the phytochemicals present in this extract were studied. These plant phytochemicals act as reducing agents to reduce the silver nitrate (AgNO3) to silver nanoparticles (AgNPs) which was confirmed by UV/Vis spectrophotometer, Fourier transform infra-red spectrum, X-ray diffraction analysis, and scanning electron microscopy. The 15 µL of silver nanoparticles was the minimum inhibitory concentration for Klebsiella pneumonia and Bacillus subtilis. The 20 µL of silver nanoparticles is the MIC for Pseudomonas aeruginosa, Vibrio harveyi, and Plesiomonas shigelloides. 30 µL of plant flower extract concentration highly inhibits the E. coli, Staphylococcus aureus, Salmonella paratyphi, Vibrio mimicus, and Vibrio alginolyticus bacterial pathogens. C. nucifera male flowers extract derived silver nanoparticles are highly stable and have high potential activity against MCF-7 Cell line.
KEY WORDS: Cocos nucifera, Nanoparticles, Phytochemicals, Antimicrobials, Bacterial pathogens, MCF 7 Cell line
Bull. Chem. Soc. Ethiop. 2024, 38(3), 715-724.
DOI: https://dx.doi.org/10.4314/bcse.v38i3.13
Digital technology and Nollywood film industry
Authors: Hanmakyugh Teddy Thaddeus 
Published: March 2024

Film also known as the 7th Art is a medium for education, information and entertainment which has over the years undergone a series of technological innovations. This paper examines the evolution of cinema from the ‘silent era’ to the ‘new age era’ characterized by a trajectory of innovations and improvements due to technological developments. The paper adapts the Diffusion of Innovations Theory (DIT) propounded by Everett Rogers in 1962 to assess the extent to which innovations in digital technology have altered the old traditional film production landscape. The paper seeks, among others, to determine and highlight the significant areas technology has impacted on the development of motion pictures globally with particular emphasis on the Nigerian film industry popularly known as Nollywood. Our major point of interest is on the roles, impacts, challenges and prospects of digital technology in the areas of production, distribution, marketing and exhibition of films. By using the assumptions of DIT which seeks to explain how, why, and at what rate new ideas and technology spread. The paper further reviews relevant literature and some empirical results from scholars to justify its claims. We are able to establish in our findings that digital technology is the driving force of film development which has contributed enormously to world cinema. Furthermore, the rapid development and emergence of Nollywood film industry as the second largest producer of films in the world next to Bollywood of India is attributable to the emergence of digital technology.
Amplifying theatre aura in the era of amplified technology
Authors: Ibironke Shalom , Yacim Roseline Ande 
Published: March 2024

Theatre scholars and practitioners have expressed concerns about the state of theatre, with some even proclaiming that it is dying or dead. This viewpoint is often rooted in the observation of the growing competition in the art and culture sector, driven by the advancements in technology that have led to the emergence of digital art and Non-Fungible Tokens (NFTs). While these technological innovations have the potential to enhance the quality of theatre content, they also present a new alternative that theatre finds hard to compete with. This article builds on Walter Benjamin's The Work of Art in an Age of Mechanical Reproduction, to explore the concept of aura and its relevance in contemporary Nigerian theatre. The study delves into the nature of the aura's manifestation, examines Benjamin's claims on the decay of the aura, and investigates how the aura has survived in the past. It further examines how modern art, particularly digital art and NFTs, have created a new form of utility. The study aims to identify strategies that can amplify theatre's aura to compete favourably with modern technology and attract new audiences whose tastes are heavily influenced by modern technology. The study finds that the theatre and its artists can use NFTs to record the provenance of their physical artworks, such as costumes, props, and set designs to allow potential buyers to easily check for the authenticity of the artwork and preserve the aura of the piece. Thereby, providing insights on how the aura can be preserved and revitalised to ensure theatre's continued relevance in the age of technology.