bluuebunny/crossref_metadata_2025_split huggingface dataset:
Uncovering Differences: A Study on Loyalty in Esports Mobile Apps by Gender
Authors: Amor Jaime SC , Alguacil Mario , Crespo-Hervás Josep , Calabuig Ferran 
Published: June 2024

Abstract
The aim of this research is to assess the existence or absence of differences in brand perceptions of users of an esports mobile app according to gender. In addition, it intends to discover the explanatory capacity of brand variables for the prediction of user loyalty, to understand how these variables influence perceptions according to gender, and to contribute to the creation of strategies more aligned with the interests and needs of each target audience.
The study involved 1,668 users of an esports tournament mobile app. An online questionnaire created for this purpose was used to discover users’ perceptions of brand awareness, corporate image, perceived quality, and loyalty. The data were analyzed by creating structural equation models according to gender.
The study shows the absence of significant gender differences in the values of the brand variables, with higher means in the case of men. In addition, the important role of brand awareness, corporate image and perceived quality in understanding the loyalty of users of an esports app is confirmed for both genders, with differential aspects in the explanatory weight of some variables according to gender.
This study analyses brand perception in mobile sports apps and its relationship to user loyalty, a context that has been little analyzed so far at the brand level. In addition, it does so from a gender perspective, contributing to elimination of existing barriers and stereotypes in the context of esports events by discovering possible differences that allow managers to address each target audience more effectively.
Investigation of the Scale Effects on Roll Motion for The Ship Bettica Using Numerical Simulation
Authors: Phuong Nguyen Thi Ha , Yoshida Naofumi , Taniguchi Tomoki , Katayama Toru 
Published: June 2024

Abstract
In this paper, we focus on analysing scale effects on the roll motion of the Italian ship Bettica using a numerical method. First, the roll decay motion of the ship is simulated at both the model scale and full scale, and the predicted results are compared with experimental data to validate the numerical strategy. The results show that there are scale effects that cause the difference in roll amplitudes between the model and the full-scale ship. To investigate the viscous effects on the roll damping components, forced roll simulations are carried out at the model scale and full scale, and the roll damping components (frictional, wave-making, eddy-making, bilge keel and lift components) are obtained. An analysis of these roll damping components indicates that the frictional component is influenced by scale effects, especially in the case of zero or low forward speed. We also show that the bilge keel component is affected by scale effects when the height of the bilge keels is reduced to a certain value below the boundary layer thickness. The velocity fields around the bilge keels are analysed to better understand the scale effects.
Simulation Tests of a Drive Shaft and Propeller Control Subsystem for a Fast Boat
Authors: Grządziela Andrzej , Hożyń Stanisław 
Published: June 2024

Abstract
This paper presents an analysis of the acceleration of a fast boat using a simulation model. Mathematical equations of ship motion dynamics with two types of propeller capabilities are developed using MATLAB and Simulink as simulation tools. The equations are extended to include the acting thrust, resistance, propeller’s performance curves, and the PID governor curve for the acceleration manoeuvre. The application models the dynamic differential equations representing the vessel dynamics in one degree of freedom. MATLAB code was used to develop the ship acceleration as a multibody system. Modules of hydrodynamic forces, resistance, moments, and propeller performances were implemented to simulate the ship manoeuvring process. A comparison of the results for the boat’s propulsion performance with two different propellers and the characteristics of the PID governor, which controls the fuel dose in the gas turbines, was carried out. We present a summary including a comparative analysis of the results for the boat dynamics with and without the PID governor. The results obtained here confirm significant discrepancies between the results of numerical simulations with and without the PID governor.
Dynamic Modelling and Experimental Analysis of an Offshore Crane Payload Positioning System with a Parallel Cable-Driven Method
Authors: Ren Zhaopeng , Huang Zhe , Zhao Tingqi , Wang Shenghai , Sun Yuqing , Chen Haiquan , Fang Nan 
Published: June 2024

Abstract
The violent swinging motion of a payload imposes significant safety problems for the operation of offshore ship-mounted cranes (offshore cranes). We therefore propose a stable experimental hoisting platform for an offshore crane payload positioning system with a parallel cable-driven method (PP-PCDM), and an adaptive cable-drive anti-swing tension (ACAT) control method based on the PP-PCDM is developed to resolve the problem of swinging of the payload by limiting its spatial position. The PP-PCDM enables synchronous tracking of the movement of the payload when the crane is working. When the payload deviates from a stable state due to an external disturbance, the anti-swing cables are immediately retracted or released based on the feedback signal. The spatial position of the payload is then limited by adjusting the length and tension of the parallel cables until the payload appears stationary from the perspective of the ship’s deck. Operational safety and efficiency is substantially improved, and the proposed PP-PCDM structure and ACAT control method can be applied to a variety of different types of cranes. The results of simulations and physical experiments show that the anti-swing effect exceeds 89.86%. The PP-PCDM enables excellent performance of synchronous tracking and hoisting assistance, and ensures that the rated lifting weight of the offshore crane is not affected.
Numerical Study of the Scale Effect on Flow Around a Propeller Using the CFD Method
Authors: Van-Vu Huynh , Le Tat-Hien , Thien Doan Minh , Tao Tran Van , Ngoc Tu Tran 
Published: June 2024

Abstract
This paper presents an investigation of the scale effect on the flow around a propeller using the CFD method. The differences in the numerical setup and the results obtained for the characteristics of an open water propeller are described and analysed in this paper. Moreover, the paper also highlight and analyse the scale effect on differences in flow around the propeller, such as the pressure fields in the cross section, the distributions of the skin friction coefficient and limiting streamlines on the propeller blade, the vortices in the wake of the propeller, and the velocity fields. The differences in the flow around the propeller are more clearly seen when it works under heavy loading conditions, an important finding that can support designers in improving propeller performance, investigating cavitations, etc. at the full scale. The reference propeller used in this study is the benchmark propeller PPTC VP 1304.
Experimental Validation of an FEM Model Based on Lifting Theory Applied to Propeller Design Software
Authors: Grządziela Andrzej , Kraskowski Marek , Król Przemysław , Szturomski Bogdan , Kiciński Radosław 
Published: June 2024

Abstract
In the process of designing a marine propeller, hydroelasticity effects are neglected in most cases, due to the negligible influence of the blade’s deformation on its hydrodynamic characteristics. However, there are cases where the impact of hydroelasticity is crucial, for example in the case of high skew-back propellers or heavy-loaded composite propellers. Furthermore, the importance of composite propellers is growing due to their wide range of application, for instance in naval ships and unmanned vehicles. Although structural models and two-way fluid-structure interactions are implemented in most commercial CFD solvers, their relevance to the design process is severely limited due to the high computational cost for a single iteration. An effective solution would therefore be to implement a two-way fluid-structure interaction model in the lifting surface software, which is commonly accepted as a design tool due to its relatively low computational time and its applicability to multi-criteria optimisation. This paper presents the results of hydrodynamic analyses of an elastic propeller carried out using in-house software based on the lifting surface flow model, and extended with the FEM model for the blade structure. The results are compared with experimental measurements and computational analyses with the commercial RANS solver STAR-CCM+.
Optimisation of Double Floating Bodies for Small Unmanned Marine Devices Based on a New Hydraulic Flexible WEMP System
Authors: Cong Dongsheng , Ma Kai , Zhang Ruijun , Li Li , Zhang Xu 
Published: June 2024

Abstract
Low-power, small-size, unoccupied devices are often used in the ocean. However, the requirements for long-distance operation and long-term, high-power supplies have always been difficult technical problems to solve. Wave energy can be effectively used to meet the requirements of a high power supply. Based on a comprehensive analysis of the shortcomings of existing wave energy converters, we present an innovative design for a novel hydraulic flexible wave energy mobile power system and its internal structure. The dynamic model is then simplified into a double-float system, with a spring force from a flexible liquid bag on the upper and lower floating bodies. Furthermore, a model is developed to assess the energy efficiency of the double floating body, and the energy supply strategy and the posture of the double-float system are investigated. The hydrodynamic parameters of three typical axisymmetric rotary floating bodies are analysed using AQWA software, and it is found that the hemispheric-bottomed cylinder (HBC) exhibits superior energy efficiency under the same conditions of space, mass, and drainage volume. Its energy efficiency is mainly reflected in its ability to capture the wave frequency and wave width. HBC floaters perform optimally in both respects. The stability of our design is analysed, and a mathematical relationship between the centroid G and the centre O of the HBC model is developed. The stability of the model is then studied. This study provides a theoretical basis for the provision of low-power, compact, unmanned maritime equipment.
Spectral Analysis of Compass Errors Based on Fast Fourier Transform and Reduction Absolute Errors Using a Pass-Band Finite Impulse Response Filter
Authors: Jaskólski Krzysztof , Czaplinski Wojciech , Tomczak Arkadiusz 
Published: June 2024

Abstract
Compass errors can be regarded as a deviation of the vessel from the expected heading. Gyrocompass errors are randomly oscillating in nature, and it is difficult to describe the behaviour of a gyrocompass sufficiently accurately using mathematical relationships. Fibre-optic gyroscopes have no mechanical components, so the variability in their indications has a different nature; the computational processes and inertial sensors used cause certain types of errors. Thus far, compass studies have focused on presenting absolute errors in the time domain. However, compasses exhibit specific characteristics in the frequency domain that affect the amplitude of their deviation. This leads to the issue of identifying the oscillatory spectrum of errors in the operation of such compasses, and how this spectrum is impacted by the dynamic movement of the vessel. We attempt to assess this phenomenon by means of measurements taken on board the training and research vessel M/S NAWIGATOR XXI. The application of a fast Fourier transform allows for calculation of the absolute compass errors in the frequency domain, meaning that the frequency of occurrence of errors can be observed as noise against the background of the useful signal. Our results confirm the value of applying a finite impulse response filter, which is used to filter out noise in the form of absolute compass errors from the useful signal background. The convolution function proposed here considerably extends the possibilities for analysing the signal spectrum in the frequency domain when testing for the accuracy of compass device indications, and enables the elimination of random errors with a low frequency of occurrence..
Simulation-Based Approach to a More Efficient Handling Strategy for a Container Terminal Storage Yard: Case Study of the Baltic Hub Container Terminal
Authors: Moszyk Karol , Janowczyk Olga , Deja Mariusz 
Published: June 2024

Abstract
The primary objective of this research was to implement a more efficient handling strategy in the container terminal storage yard at the Baltic Hub Container Terminal (BHCT). Following an analysis of the current logistics system associated with starboard-side mooring, an attempt was made to shift the mooring to the port side. Two routing strategies corresponding to the analysed mooring operations were tested using a developed model. Simulations were conducted to enable a comparison of various handling strategies that were suitable for the mooring arrangements and equipment under investigation. This analysis was based on reliable information obtained from a real process. Evaluative criteria for examining the impact of changing the handling strategy of internal movement vehicles (IMVs) in the terminal storage yard in terms of process efficiency included the total time and distance of container transportation and the truck utilisation level. A new route for IMVs was developed to accommodate the changed mooring operation. This adjustment aimed to enhance the discharge process and to reduce the distance travelled, resulting in a reduction in fuel consumption. The shorter travel distance also positively impacted productivity, and contributed to a reduction in operating costs. The changes to the mooring arrangement directly resulted in a 10% increase in the quay crane gross productivity, measured in moves per hour (mph). Given that many ports do not pay attention to how ships are moored, the case study and analysis presented here can help staff quickly improve their handling strategy and productivity, thus increasing the port’s competitiveness.
Morphological features of myocardial bridging in patients who underwent CT coronary angiography in the National Heart Centre of Nepal
Authors: Kadel Arun , Rauniyar Binay Kumar , Kharel Sushant , Neupane Keshab Raj , Prajapati Dipanker , Adhikari Chandra Mani , Roka Madhu , Neupane Nirmal Psd 
Published: June 2024

Abstract

Objective
Multidetector computed tomography is considered a reliable, non-invasive modality for diagnosing myocardial bridging. The prevalence of myocardial bridges varies greatly based on the technique used to identify the anomaly. We aimed to evaluate the frequency and morphological features of myocardial bridging in patients who underwent ECG-gated 640 slice Multidetector computed tomography coronary angiography at Shahid Gangalal National Heart Centre.

Methods
A retrospective cross-selectional study was conducted at Shahid Gangalal National Heart Centre. From 1 January 2021 to 30 June 2021, 1068 consecutive patients were enrolled, and the frequency and morphological features of myocardial bridging among those patients were evaluated.

Results
Among the 1068 patients examined, 141 had one or multiple Myocardial bridging (13.2%). Out of 141 patients, 94.3% of bridging was superficial, while only 5.7% was deep. 97.9% of myocardial bridging was located in the left anterior descending artery, and 86.2% was present in the mid-segment of the left anterior descending artery.

Conclusion
Multidetector computed tomography is an effective noninvasive method for the diagnosis of myocardial bridging. The frequency of myocardial bridging in our study was 13.2%.
Labour Force Composition and Labour Shortage in North-Western Romania: A Cross-County Comparison1
Authors: Földes Ionuț , Mihály Zoltán , Pop Cristian 
Published: June 2024

Abstract
The paper analyses the labour force composition of two adjacent counties in north-west Romania: Maramureș and Sălaj. Regionally, employers stress the lack of available labour force and resort to commuter networks from nearby rural areas and immigrant labour. Why labour shortage? It is argued that Romania’s FDI-reliant export-led growth model factors in. Namely, the growth model’s reliance on low-cost labour that reduces employment incentives to a minimum (often minimum wage) and employment in repetitive labour-intensive activities make the prospect less attractive. If technological upgrading – requiring skilled employees – is absent, regional labour availability tends to be an issue. Alternative subsistence methods are favoured: seasonal transnational migration, household agricultural subsistence and remittances from relatives. Tying livelihood to families and households, these methods pool resources to replace (even if in part) wage labour under global market-dependency conditions.
Debt Dependency and the Cost of Migration: The Case of Roma and Non-Roma Migrants from Baia Mare
Authors: Delibas Hestia Ioana 
Published: June 2024

Abstract
The Baia Mare region was once one of Romania's main mining centres, with a significant proportion of the local population engaged in industry jobs. However, the extensive economic restructuring that followed the collapse of the old communist regime and the emergence of capitalist development was characterized by brutal privatization measures and great economic instability. While the transition years brought new opportunities for some, for most they meant unstable housing and employment, debt, and a declining social status. Thus, many workers quickly became ‘surplus populations’ (Li 2017) and were forced into patterns of circular migration abroad. Employing a qualitative research methodology, analysing both interviews and secondary data, this paper will focus on the adaptive responses of workers from Baia Mare to the changes in the socio-economic landscape after the collapse of the communist regime and the advance of neoliberal policies in Romania. In particular, the paper looks at Roma and non-Roma migrants from Baia Mare, attempting to compare their strategies and work histories in the context of migration, to see the extent to which class and race differences play a role in creating specific migration patterns in the post-socialist context. The comparison between racialized people living in improvised shelters on the periphery of Baia Mare and those who are working class but not living in a situation of destitution will show us the role that dispossession plays in creating certain conditions that lead to debt dependency and specific migration patterns.
Planning Hatvan: Urban Planning and Repression in One of Baia Mare’s Roma Neighbourhoods (1950-1989)
Authors: Mireanu Manuel 
Published: June 2024

Abstract
This paper starts from the premise that social space, the state space, is a socially productive territory characterized, among other things, by hierarchical social, economic and political relations. This hierarchical dimension of space comes to the fore when researching the urban marginalization of Roma people in Romania. The mechanisms of exclusion employed by the state against Roma groups are situated in a wide range of other policies, among which uneven territorial development ranks chief. As such, this paper seeks to analyse the junction between these processes. It asks the question: how did the process of urban planning reinforce the urban marginalization of Roma people during socialism in Baia Mare? In order to address this question, I mobilize the results of two years of archival research in the city of Baia Mare, coupled with the discursive analysis of this archival material. I perform a diachronic analysis of how Roma people were targeted by state practices of urban marginalization, such as stigmatization, criminalization and repression. I show how the policies of systematisation of Baia Mare shaped the territory of a particular neighbourhood – Hatvan, attempting to manage and control the Roma population there. Throughout the 1960s, Hatvan was considered a focal point for crime. This led to a large-scale plan to completely transform the area through evictions, demolitions and the displacement of Roma people. The result was a place that was seen as clean, ordered and lawful social space, which became what is currently known as the Vasile Alecsandri neighbourhood. However, this space continues to this day to be one of social marginalisation, economic deprivation and institutionalised racism.
“Aos Poucos, a vida Volta ao Normal”. Conflitos e Cotidiano em um Assentamento Rural
Authors: Alves Amone Inacia 
Published: June 2024

O presente estudo tem por objetivo analisar o cotidiano de um assentamento rural, Fazenda São João do Bugre, a mais antiga ocupação em Goiás, a fim de analisar as experiências vivenciadas após o período de conflito. A escolha desse assentamento, na região de Goiás, se deu pelo fato de ter, desde o processo de acampamento e ocupação, um forte acompanhamento e suporte da Comissão Pastoral da Terra - CPT. Contribuiu, também, para a escolha desse assentamento o fato de que as entrevistas selecionadas com agentes e ex-agentes pastorais apontaram para o fato deque eram inexistentes movimentos sociais no campo no Estado antes dessa ocupação. Com o uso da etnografia, entrevistas de caráter semiestruturado, procuramos captar os sentidos e os significados da conquista da terra paraaquele grupo. Nesse propósito, questionamos: Em que aspectos tornaram visíveis as mudanças provocadas pela formação empreendida pela CPT aos trabalhadores rurais da Fazenda Estiva/São João do Bugre? A fim de analisar essa questão fomos ao Assentamento da Fazenda Estiva, para melhor entender os resultados dessa formação empreendida pela CPT.
Educação do Campo em Busca de uma Identidade: Um Estudo de Caso na Escola “Sueli Mari Gheller” - Videira – SC
Authors: Nunes Juliana , Maciel Marluse Castro 
Published: June 2024

A rotatividade na escola de campo interfere na construção de identidade dos educandos. Diante dessa questão surge a necessidade de uma reflexão sobre as características e motivos que levam a rotatividade, assim como compreender a importância de uma educação no campo e para o campo. Neste contexto, o objetivo deste artigo é compreender osmotivos que causam a rotatividade dos alunos de 1º à 5º ano da Escola Polo Professora Sueli Maria Gheller. Trata-se de um estudo de caso e a metodologia utilizada para a realização dessa pesquisa foi análise de dados quantitativos coletados. Entende-se que o aluno, como todo ser humano, cria sua identidade a partir da cultura que o cerca, por isso necessita pertencer a um grupo para construir essa identidade, nesse sentido, a evasão escolar e a rotatividade não permitem que esse sentimento de pertencimento aconteça, afetando o educando cognitiva e afetivamente. Desse modo, surge um novo olhar voltado para a educação do campo, pois essa pesquisa vem mostrar que a escola pesquisado possui desafios e anseios, diferentes das demais, que precisam ser enfrentados.