bluuebunny/crossref_metadata_2025_split huggingface dataset:
Управление автономным подруливающим устройством
Authors: Бурылин Я.В. , Попов А.Н. , Кондратьев С.И. , Боран-Кешишьян А.Л. , Соловьёв А.В. 
Published: December 2024

В статье предлагаются алгоритмы автоматического управления автономным подруливающим устройством в различных режимах его эксплуатации. Устройство предназначено для кантования судна в стесненных условиях порта с целью безопасной постановки к причалу на смену обычным буксирам-кантовщикам. В режиме свободного хода по заданной траектории авторулевой устройства имеет вид расширенного ПИД регулятора по курсу с учетом поправки за отклонение от траектории. Для обеспечения режима динамического позиционирования используются оба азипода и работают синхронно в направлении, обратном отклонению от заданной точки. В режимах эскортирования и сближения с судном учитываются скорости и курсы судна и устройства для решения задачи стабилизации устройства по ориентации и направлению движения. Для режима подруливания производится декомпозиция управления по каналам средств управления, когда азиподы, работая совместно, обеспечивают управление по поперечному и вращательному движениям, главный двигатель судна - по продольному движению. В режиме швартовки характер управления носит черты как алгоритма управления по траектории, так и режима динамического позиционирования.
The article proposes algorithms for automatic control of an autonomous thruster in various modes of its operation. The device is intended for tilting a vessel in cramped port conditions for the purpose of safe docking at the berth to replace conventional tugboats. In the free-wheeling mode along a given trajectory, the autopilot has the form of an extended PID heading controller, taking into account corrections for deviation from the trajectory. To ensure dynamic positioning mode, both azipods are used and operate synchronously in the direction opposite to the deviation from a given point. In the modes of escorting and approaching a vessel, the speeds and courses of the vessel and the device are taken into account to solve the problem of stabilizing the device in orientation and direction of movement. For the steering mode, control is decomposed into control channels, when the azipods, working together, provide control for transverse and rotational movements, and the main engine of the vessel - for longitudinal movement. In the mooring mode, the nature of the control has the features of both the trajectory control algorithm and the dynamic positioning mode.
Исследование влияния строительства мостового перехода через р. Ока (г. Нижний Новгород) на вышерасположенные водоводы с применением математического моделирования руслового потока
Authors: Решетников М.А. , Ситнов А.Н. , Воронина Ю.Е. , Шестова М.В. 
Published: December 2024

Для проектируемого мостового перехода через р. Ока в г. Нижний Новгород произведена оценка влияния его строительства на надежность эксплуатации вышерасположенных по течению водоводов в русле. Данные водоводы подвержены размыву и для оценки влияния возводимых опор моста на состояние водоводов произведено трехмерное математическое моделирование речного потока в исследуемом районе реки. Моделирование основывается на системе уравнений Навье-Стокса. Для описания турбулентных явлений используется k-e модель турбулентности. Трехмерная геометрия исследуемого участка включает русло реки, мостовые опоры, водоводы. Выполненное математическое моделирование участка р. Ока в районе водоводов в двух состояниях – в естественном (до строительства моста) и эксплуатационном (после ввода моста в эксплуатацию) при низких меженных уровнях позволило сделать вывод о практически отсутствующем влиянии опор моста на дальнейший размыв дна в районе водоводов. Также не оказывает влияния на размыв дна под трубами водоводов дноуглубление, необходимое для поддержания судоходства на дополнительном судовом ходу в рукаве. Результаты работы предназначены для использования при проектировании и строительстве объекта.
For the projected bridge crossing over the river. An assessment of the impact of its construction on the reliability of operation of upstream aqueducts in the riverbed was carried out in Nizhny Novgorod. These conduits are subject to erosion and to assess the impact of the bridge supports being erected on the condition of the conduits, three-dimensional mathematical modeling of the river flow in the studied river area was performed. The simulation is based on a system of Navier-Stokes equations. The k-e turbulence model is used to describe turbulent phenomena. The three-dimensional geometry of the area under study includes the riverbed, bridge supports, and culverts. The performed mathematical modeling of the section of the river The Oka in the area of the aqueducts in two states – in natural (before the construction of the bridge) and operational (after the bridge was put into operation) at low inter-soil levels allowed us to conclude that there was practically no effect of the bridge supports on further erosion of the bottom in the area of the aqueducts. Also, dredging, which is necessary to maintain navigation on an additional ship's course in the sleeve, does not affect the erosion of the bottom under the pipes of the aqueducts. The results of the work are intended for use in the design and construction of the facility.
Разработка и исследование системы эффективного маневрирования судна курсом для расхождения с судном-целью на основании оптимизационного подхода
Authors: Филатов В.И. , Астреин В.В. , Боран-Кешишьян А.Л. , Михеева Т.А. , Федосенко Ю.С. 
Published: December 2024

Данная статья является продолжением ряда исследований [1, 2, 3, 12, 13] по разработке системы поддержки принятия решений безопасности судовождения – СППР. В предлагаемом исследовании рассматривается вопрос выработки траектории движения судна, обеспечивающей безопасность судовождения с учётом ограничений, накладываемых на область маневрирования. Объектом управления является морское судно. Задачей судна является следование между последовательно-заданными координатами по линиям заданного пути (ЛЗП). Средой, в которой судну необходимо следовать составляют статические и динамические объекты, которые оказывают влияние на безопасность судна. В статье рассматривается метод выработки манёвра для расхождения с судном-целью таким образом, чтоб обеспечить безопасность судна. Разработан алгоритм, позволяющий реализовать метод для автоматического расчёта безопасного курса, который основан на синтезе численных методов, теории графов, математическом моделировании, методов численной оптимизации. Результатом работы алгоритма является модифицированная траектория расхождения с судном-целью, обеспечивающее расхождение на безопасном расстоянии.
This article is the continuation of cycle researches [1, 2, 3, 12, 13] dedicated to develop marine Ship’s Decision Support System of Navigational Safety – DSS. The Subject of generation Ship’s preliminary navigation trajectory that manages navigational safety taking into account restrictions and obstructions that exist in navigational area described in this article. The controlled object in this system is marine Vessel. The main challenge of the Vessel is Proceeding between sequentially-ordered positions with its coordinates through Voyage Plan Courses (VPC). External area, where the Ship should navigate consists of static and dynamic objects that may have influence on Safety of Navigation. In the research highlighted method of maneuver generation for collision avoidance with other target-tracked vessels (ТТ) such way to manage Safety of Navigation. The Algorithm developed that could solve above-mentioned Task for automatic calculation of Safety maneuver, that based on mathematical methods and includes numerical methods, graph theory, mathematical modelling, methods of numerical optimization. The results of Algorithm performance are modified Trajectory to avoid collision or close-quarter situation with vessel-target or obstruction in a safety distance off.
Метод формирования программной скорости движения группы БПЛА
Authors: Губанков А.С. , Горностаев И.В. 
Published: December 2024

В статье представлены результаты разработки метода автоматического формирования программных скоростей движения автономных беспилотных летательных аппаратов мультироторного типа, выполняющих различные полетные задания (такие как, например, мониторинг морских и прибрежных территорий для отслеживания популяций редких и промысловых видов, оценка потенциальных объемов биологических ресурсов, аэрофотосъемка и т.д.) поодиночке или в составе группы (строя). При этом траектории движения этих летательных аппаратов задаются гладкими пространственными кривыми – параметрическими сплайнами третьего порядка, что позволяет легко их корректировать в процессе выполнения задания. Для поддержания высокой скорости движения аппаратов по траекториям при одновременном сохранении заданной точности перемещения (без нарушения строя) в работе предлагается непосредственно в процессе выполнения миссии корректировать указанную скорость таким образом, чтобы исполнительные устройства всех аппаратов успевали обеспечивать их требуемые перемещения с учетом ограничений на развиваемые движителями векторы тяги. При этом для расчета значений программных скоростей использовалась упрощенная модель динамики квадрокоптера, учитывающая влияние силы ветра, сопротивления среды, силы тяжести и суммарного вектора силы тяги движителей аппарата. Синтезируемые на основе этого метода системы могут быть реализованы даже на маломощных бортовых вычислительных устройствах беспилотных летательных аппаратов.
The article presents the results of the development of a method for the automatic formation of reference speeds for autonomous unmanned aerial vehicles of multirotor type, performing specified missions (such as monitoring of the sea and coastal territory in order to track populations of rare and endangered species, as well as evaluating the potential volumes of biological resources) singly or as part of a group (in formation). At the same time, the trajectories of these aircraft are set by smooth spatial curves – parametric splines of the third order, which makes it easy to adjust the specified trajectories during the mission. In order to maintain a high speed of movement of vehicles along trajectories with high accuracy of movement and saving formation, it is proposed to adjust the specified speed directly during the mission in such a way that the thrusters can ensure their required movements, taking into account the restrictions on the thrust vectors. At the same time, a simplified model of the dynamics of a quadcopter was used to calculate the values of reference speeds, taking into account the influence of wind force, environmental resistance, gravity and the total thrust vector of the propellers. The systems synthesized on the basis of this method can be implemented even on low-power onboard computing devices of unmanned aerial vehicles.
Balss pamatfrekvence afektīvā un neitrālā prosodijā dažādas strukturālās sarežģītības lingvistiskajās vienībās
Authors:   Rīgas Tehniskā Universitāte. Liepājas Akadēmija. Pedagoģijas un sociālā darba centrs, Trinīte Baiba , Zdanoviča Anita ,   Rīgas Tehniskā Universitāte. Liepājas Akadēmija. Pedagoģijas un sociālā darba centrs, Kurme Daiga ,   Rīgas Tehniskā Universitāte. Liepājas Akadēmija. Pedagoģijas un sociālā darba centrs, Lavrāne Evija ,   Rīgas Tehniskā Universitāte. Liepājas Akadēmija. Pedagoģijas un sociālā darba centrs, Magazeina Ilva ,   Rīgas Tehniskā Universitāte. Liepājas Akadēmija. Dabas un inženierzinātņu centrs, Jansone Anita ,   Rīgas Tehniskā Universitāte. Liepājas Akadēmija. Dabas un inženierzinātņu centrs
Published: December 2024

Emotional states can be characterised by specific acoustic parameters. Fundamental frequency (F0) reflects biomechanical characteristics of vocal folds and is sensitive to affective components. Vocally expressed negative emotions are accompanied by increased muscular activation, while positive and neutral emotions result in fewer physiological changes.

The present study aimed to research (1) whether the length of linguistic unit impacts the change of F0; (2) whether F0 differs in words, phrases, and continuous speech produced in neutral, happy, and angry prosody.

Methods: Ten professional actors (5 males, 5 females) recorded nine voice samples (4 words, 4 phrases, 1 paragraph) in neutral, happy, and angry intonations. Each linguistic unit was recorded three times, resulting in a data pool of 810 samples. Six experts assessed the affective component of each actor’s performance to obtain 270 highest-ranked samples. Selected recordings were analysed using the software PRAAT v. 6.1.31. and script Vocal fundamental frequency, v. 02.04 (Phonanium, 2019).

Results: In females, there were no statistically significant differences in speaking F0 between different linguistic units within a single prosody type. In males, mean F0 significantly increased with the increasing complexity of the linguistic unit in neutral, but not affective conditions. Overall, the highest speaking F0 was observed in happy prosody for females and in angry prosody for males. Both genders showed significant differences in mean F0 between neutral and affective prosody in words and phrases. A statistically significant difference in F0 between angry and happy intonation was observed in phrases in males and in text in females.

Conclusion: The results showed that affective prosody did not impact mean F0 between linguistic units of different complexity. However, emotional intonation increased speaking F0. The differences in F0 between neutral and affective prosody were observed in all components of linguistic hierarchy, from single words to continuous speech. Since voice is used in daily communication, recognizing the role of emotions in vocal output can improve understanding of functional voice disorders.
Formation Rate of Quasiperiodic Eruptions in Galactic Nuclei Containing Single and Dual Supermassive Black Holes
Authors: Cao Chunyang , Liu F. K. , Chen Xian , Li Shuo 
Published: December 2024

Abstract
Quasiperiodic eruptions (QPEs) are a novel class of transients recently discovered in a few extragalactic nuclei. It has been suggested that a QPE can be produced by a main-sequence star undergoing repeated partial disruptions by the tidal field of a supermassive black hole (SMBH) immediately after getting captured on a tightly bound orbit through the Hills mechanism. In this Letter, we investigate the period-dependent formation rate of QPEs for this scenario, utilizing scattering experiments and the loss-cone theory. We calculate the QPE formation rates in both a single-SMBH and a dual-SMBH system, motivated by the overrepresentation of postmerger galaxies as QPE hosts. We find that for SMBHs of mass 106–107
M
⊙, most QPEs formed in this scenario have periods longer than ≃ 100 days. A single-SMBH system generally produces QPEs at a negligible rate of 10−10–10−8 yr−1 due to inefficient two-body relaxation. Meanwhile, in a dual-SMBH system, the QPE rate is enhanced by 3–4 orders of magnitude, mainly due to a boosted angular momentum evolution under tidal perturbation from the companion SMBH (galaxy). The QPE rate in a postmerger galactic nucleus hosting two equal-mass SMBHs separated by a few parsecs could reach 10−6–10−5 yr−1. Our results suggest that a nonnegligible fraction (≃10%–90%) of long-period QPEs should come from postmerger galaxies.
Autonomous Detection of Mineral Phases in a Rock Sample Using a Space-prototype LIMS Instrument and Unsupervised Machine Learning
Authors: Gruchola Salome , Schmidt Peter Keresztes , Tulej Marek , Riedo Andreas , Mezger Klaus , Wurz Peter 
Published: December 2024

Abstract
In situ mineralogical and chemical analyses of rock samples using a space-prototype laser ablation ionization mass spectrometer along with unsupervised machine learning are powerful tools for the study of surface samples on planetary bodies. This potential is demonstrated through the examination of a thin section of a terrestrial rock sample in the laboratory. Autonomous isolation of mineral phases within the acquired mass spectrometric data is achieved with two dimensionality reduction techniques: uniform manifold approximation and projection (UMAP) and density-preserving variation of UMAP (densMAP), and the density-based clustering algorithm Hierarchical Density-Based Spatial Clustering of Applications with Noise (HDBSCAN). Both densMAP and UMAP yield comparable outcomes, successfully isolating the major mineral phases fluorapatite, calcite, and forsterite in the studied rock sample. Notably, densMAP reveals additional insights into the composition of the sample through outlier detection, uncovering signals from the trace minerals pyrite, rutile, baddeleyite, and uranothorianite. Through a grid search, the stability of the methods over a broad model parameter space is confirmed, revealing a correlation between the level of data preprocessing and the resulting clustering quality. Consequently, these methods represent effective strategies for data reduction, highlighting their potential application on board spacecraft to obtain direct and quantitative information on the chemical composition and mineralogy of planetary surfaces and to optimize mission returns through the unsupervised selection of valuable data.
Delivering Patient-Centered Care with Respect to Patient Education and Health Literacy in Athletic Training Job Settings
Authors: Mitchell Alicia M. , Neil Elizabeth R. , Eberman Lindsey E. , Armstrong Tara A. , Greffly Thomas J.P. , Winkelmann Zachary K. 
Published: December 2024

ABSTRACT

Context
A patient-centered care (PCC) environment allows athletic trainers (ATs) to develop trusting relationships with patients, enabling them to make the most informed care decisions. To provide PCC, the AT should assess health literacy and deliver quality patient education.

Objective
To explore the lived experiences of ATs from different job settings to identify how they deliver PCC specific to health literacy and patient education.

Design
Qualitative.

Setting
Virtual interviews.

Patient or Other Participants
27 ATs (age=34±10 y; women=15, men=12) from the physician practice (n=10), college (n=9), and secondary school (n=8) settings.

Main Outcome Measures
We interviewed the participants using a semi-structured interview protocol. Three researchers coded the transcripts following the consensual qualitative research process for each job setting. Trustworthiness was achieved through multi-analyst triangulation, member checking, and internal auditing.

Results
Four domains emerged from all interviews: 1) work environment, 2) essential traits and skills, 3) health literacy assessment strategies, and 4) patient education materials and delivery. In the work environment, ATs described the patient load, interprofessional relationships, and patient characteristics across settings. For essential traits and skills, ATs from the settings varied widely, and different strategies were needed based on differing patient needs. For health literacy assessment strategies, ATs did not formally assess health literacy and relied on perceptions and assumptions. Effective digital information and health informatics strategies were described for patient education materials and delivery.

Conclusions
ATs from physician practice, college, and secondary school settings describe using various strategies to create a patient-centered environment. Participants shared their behaviors in assessing health literacy and delivering patient education from various job settings.
Cerebral blood flow change with fluid resuscitation in acute ischemic stroke
Authors: Miller Joseph , Moloney John Aidan , Elagamy Noah , Tuttle Jacob , Tirgari Sam , Calo Sean , Thompson Richard , Nahab Bashar , Lewandowski Christopher , Levy Phillip 
Published: December 2024

BACKGROUND:
In acute ischemic stroke (AIS), cerebral autoregulation becomes dysfunctional, impacting the brain’s ability to maintain cerebral blood flow (CBF) at adequate levels. Reperfusion of affected and nearby brain tissue in AIS is currently the aim of treatment in AIS, but the effectiveness of fluid resuscitation on increasing the CBF is debated.

OBJECTIVE:
We investigated the hypothesis that early fluid resuscitation with normal saline bolus would improve CBF velocity in the initial resuscitation of patients with AIS.

METHODS:
We conducted a prospective, quasi-experimental study on 30 patients in the early stages of AIS management. Patients had a National Institutes of Health Stroke Scale (NIHSS) score of 3 or higher. Patients met inclusion criteria if they were 18–90 years old and had time of stroke onset within 12 h. Patients with a severe underlying disability, hemorrhagic stroke, advanced directives for comfort care/hospice, as well as pregnant patients were excluded. Noninvasive hemodynamic monitoring was performed. We performed transcranial Doppler (TCD) insonation of the middle cerebral arteries (MCAs) to measure CBF velocity. Each patient received a 500-ml normal saline crystalloid bolus as a standardized intervention, then had hemodynamic and TCD measurements repeated. Analysis was limited to patients with stroke confirmed with neuroimaging. Mean flow velocity (MFV) was compared before and postreceiving the bolus in the MCA ipsilateral to the ischemic location.

RESULTS:
Thirty patients were analyzed who had confirmed AIS. The mean age was 53 ± 13 years, 50% were female, and the median NIHSS was 6 (interquartile range: 4–7). Outcomes measured included various cerebrovascular and cardiovascular parameters. Infusion of 500-mL normal saline bolus produced increases in systolic blood pressure (+7 mmHg, 95% confidence interval [CI] 0.6–13 mmHg) and stroke volume (SV) index (+2.2 ml/m2, 95% CI 0.3–4.1 ml/m2). The mean change in MFV was not statistically significant (+0.3 cm/s, 95% CI-3.7–4.3 cm/s). An adjusted model showed higher age and lower baseline SV index were not associated with improved MFV following administration of the fluid bolus.

CONCLUSION:
Our prospective study of AIS patients revealed that a fluid bolus improves hemodynamic parameters, but did not significantly increase CBF velocity.

TRIAL REGISTRATION:
clinicaltrials.gov (identifier: NCT02056821).
How to Write a Systematic Review with Meta-analysis?
Authors: Grover Sandeep , Naskar Chandrima 
Published: December 2024

Abstract
Systematic reviews (SRs) and meta-analyses are considered to be the highest level of evidence. They attempt to synthesize the existing original research and provide a structured and comprehensive approach to evaluate the existing evidence on any given research question. This article attempts to provide an overview of how a SR differs from other types of reviews and provides information on how to do a SR and meta-analysis. SRs differ from other types of reviews in terms of having a well-defined research question, systematic literature search, predefined eligibility criteria and outcomes, assessment of study quality, synthesis of findings, and, if possible, a meta-analysis. The different steps involved in carrying out a SR include defining the research question (by using the PICOT framework, i.e. population, intervention, comparison, outcome, and timeframe), developing a protocol and registering the same, carrying out a comprehensive literature search, carefully selecting the studies, extracting the data, assessing the quality of the included studies, data synthesis, and interpretation of results. For meta-analysis, additional steps involve the calculation of effect sizes, choosing the appropriate model for analysis (fixed vs. random effects), preparation of forest plots, assessment of publication bias, and doing subgroup/sensitivity analyses.