bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel two-degree-of-freedom nonlinear piezoelectric energy harvester with a stopper for broadband low-frequency vibration
Authors: He Qingkai , Xu Zhenlong , Sun Shenyu , Zhou Maoying , Wang Yun , Ji Huawei 
Published: August 2023

Energy conversion efficiency and operation bandwidth are two main concerns in piezoelectric energy harvesting in low-frequency vibration environments. This paper presents a compact two-degree-of-freedom nonlinear piezoelectric energy harvester (2DOF NPEH) with a stopper. The proposed harvester consists of an elastic beam, a piezoelectric beam with tip mass, a pair of repulsive magnets, and a mechanical stopper. A bistable configuration is established through magnetic interaction. This study investigates the generating characteristics of the 2DOF NPEH under frequency-sweep excitation, utilizing a rigid stopper (RS) and different elastic stoppers (ESs). The experimental results indicate that the implementation of a mechanical stopper in a NPEH contributes to widening the operation bandwidth and enhancing the peak voltage. As the stiffness of the stopper increases, the bandwidth gradually shrinks while the peak voltage increases. The optimal energy conversion efficiency depends on the stiffness of the ES, and it occurs when the wire diameter of the spring is 1.2 mm. Compared with the 2DOF NPEH without a stopper, the utilization of a RS results in a 13.85-fold increase in the bandwidth of the generator at the first resonance. Moreover, the maximum absolute voltage is 12.82 times and 3.47 times the output voltage of the 2DOF NPEH at the first and second resonance, respectively. This work offers valuable insights into the design and optimization of piezoelectric energy harvesters in practical applications.
A drum structure triboelectric nanogenerator based on PS/MXene for football training monitoring
Authors: Wu Min 
Published: August 2023

Recently, flexible multifunctional sensors have attracted widespread attention from around the world. Here, we propose a novel PS/MXene-based triboelectric nanogenerator (PM-TENG), which has a drum structure design. Through comparative experiments, the optimal ratio of polystyrene (PS) materials was explored. The PS film and nylon film form the triboelectric materials, and copper foil acts as the conducive electrode. From the results, the open-circuit voltage (Voc) and short-circuit current (Isc) of the PM-TENG based on 35 mg/ml content of PS can reach 141 V and 5.9 µA, respectively. In addition, when the resistance value of the external load is 50 MΩ, the PM-TENG exhibits a maximum output power of 123 µW. Due to its excellent flexibility, the PM-TENG can be installed on the shoulders, neck, wrist, elbow, knee, and ankle to achieve all-round motion monitoring of football players. This research can promote the application of TENG sensors in the football monitoring field.
Candidate genes for height measurements in Campolina horses
Authors: Krebs Lisia Castro , Santos Marina Monteiro de Moraes , Siqueira Maria Claudia , Araujo Brennda Paula Gonçalves de , Solar Diaz Iara Del Pilar , Costa Raphael Bermal , Oliveira Chiara Albano de Araújo , Barbero Marina Mortati Dias , de Camargo Gregório Miguel Ferreira , Godoi Fernanda Nascimento de 
Published: August 2023

Context Genomic tools allow for increased efficiency in animal production and, consequently, greater production gains. Morphometric measurements of height can be used for breed characterisation/registration, and sex distinction, in addition to being associated with balance, posture, and the range of motion of the limbs, influencing the dynamics and quality of the gait. Aims This study was conducted to examine candidate genes related to the morphometric measurement of heights in Campolina horses. Methods The study involved information from 18 876 horses of this breed, containing phenotypic data of the measurements of withers, croup, back, and barrel heights, provided by the Brazilian Association of Campolina Horse Breeders (ABCCCampolina). Of these, 48 horses of the Brazilian Campolina breed were genotyped with the Equine 65 K lllumina® chip. The effects of the single-nucleotide polymorphisms were estimated by the weighted single-step method, using BLUPF90 family programs. Genes in the main chromosomal regions were identified by consultation with the NCBI. Key results A genomic-wide association study for withers height showed that 46% of the variation in this measurement was explained by 20 genomic windows. For croup height, 19 genomic windows were responsible for explaining 44% of the variation. Sixteen genomic windows were responsible for explaining 37.8% of the variation in back height and 18 genomic regions explained 39.7% of the variation in barrel height. Conclusion The ADAM17, SOX11, and KLF11 genes are located in the genomic windows that most explain the variations in the traits under study and have a biological action on the locomotor system. Implications The ADAM17, SOX11, and KLF11 genes are candidates for fine mapping and construction of molecular markers.
Scaling student feminisms
Authors: Elvira Ruiz Paloma 
Published: August 2023

Abstract
Ethnographically informed, this article examines the recent transnational feminist uprising by focusing on the Spanish student movement. Drawing on the contributions of the sociolinguistics of globalization and the pragmatics of scale, it gives an account of how feminist demands acquire intelligibility in the political agenda of the student movement based on a Madrilenian university, vis-a-vis the institutionalization of gender equality policies at university. Thus, by tracking the (un)making of political alliances over time between various coexisting centring institutions – spanning from university official authorities to forms of student grassroots institutionality – the article delves into the valuation processes of feminist scales and their competing logics of value-production, paying attention to how these processes get inscribed in the semiotic landscape.
Is indirect translation a friend or a foe of sustainable development?
Authors: Torres-Simón Ester , Valdez Susana , Pięta Hanna , Menezes Rita 
Published: August 2023

Abstract
This article addresses the United Nations’ Sustainable Development Goal 8 (Decent Work and Economic Growth) through the lens of pivot template subtitling, a practice deemed logistically efficient by some and ethically suspicious by others. Drawing on (i) a critical review of 29 European codes of ethics promoted by professional translation associations and (ii) the answers to our online questionnaire on pivot subtitling (completed by 376 subtitlers based in Europe), we analyse the main concerns raised about pivot subtitling from the standpoint of access to decent work and economic growth in the AVT industry. Findings suggest that, from the professional subtitlers’ point of view, current practices in pivot template-centred workflows may slow down the progress on SDG8, worsen working conditions and clash with professional codes of ethics. We end by suggesting ways to improve the use of indirect translation, so it does not hinder progress on SDG8 in the AVT industry.
Reply to the comment on ‘Limitations in evaluating COVID-19 protective face masks using open circuit spirometry systems: respiratory measurement mask introduces bias in breathing pressure and perceived respiratory effort’
Authors: Seibt Robert , Bär Mona , Rieger Monika A , Steinhilber Benjamin 
Published: August 2023

Abstract
Marek and colleagues have written a commentary on our paper (Seibt et al 2023) in which they point out some methodological inconsistencies and flaws. In our response, we first address the objective of our study so that the specific responses to Marek’s criticism are placed in the proper context. In Seibt et al (2023) we investigated whether additional respiratory measurement masks used to evaluate protective face masks influence the outcomes. The physiological effect of protective masks was not the target in our study, neither at rest nor during exercise. Subsequently, we address the criticisms of Marek et al point by point. With our study and this detailed response to Marek et al (2023)), we hope to support researchers in choosing the adequate methodological approach for evaluating the effects of protective face masks on human physiology.
Modified description for deposition of particles in small volumes
Authors: Orabi M 
Published: August 2023

Abstract
Different elements that control the concentrations and doses from radioactive particles are in need to be elaborately studied. From theoretical point of view, this requires improving the models that describe the controlling elements of the behaviors and dynamics of the particles. An important element is the deposition of the particles onto surfaces within small volumes, like gaps in buildings’ shells. This element is studied in this article by developing a modified theoretical scheme built by starting with the Fick;s 1st

law

of

diffusion
.

Velocities of depositions are calculated by taking into account the

turbulent

and

brownian

diffusion mechanisms within the

boundary

layer
.

The dependence of the particle’s eddy diffusion coefficient on the distance close to the surface is expressed by a

fourth

power

relation. This relation has only one free parameter. The model considers the

boundary

layer

to be composed of only one region. The value of the free parameter is determined in relation to the

friction

velocity
.

Particles sizes of

1

nm

–

100

μ
m

are studied. The obtained resulted are presented in comparison to one of the famous theoretical models. Agreeing with experiments, the proposed model shows a promising success and provides a deeper vision to describing the turbulence inside small-sized spaces. Additionally, it gives a new definition to the form and size of the

boundary

layer
.
Estimation of radiative capture 13B(n, γ
0+1)14B reaction rate in the modified potential cluster model*
Authors: Tkachenko A.S. , Burkova N.A. , Yeleusheva B.M. , Dubovichenko S.B. 
Published: August 2023

Abstract
We discuss current attempts to employ the modified potential cluster model to describe the available experimental data on the 13B(n, γ
0+1)14B total cross-sections. The estimated results of the M1 and E1 transitions from the n
13B scattering states to the ground and first excited states of 14B are presented. The 1st resonance at E

x
= 1. 275 MeV (1+) is revealed in both the cross-section and reaction rate. Within the variation in the asymptotic constant, a thermal cross-section interval of 5.1 – 8.9 mb is proposed. Based on the theoretical total cross-sections at energies of 0.01 eV to 5 MeV, we calculate the reaction rate in the temperature range of 0.01 to 10T
9. The ignition T
9 values of the 13B(n, γ
0+1)14B reaction depending on a neutron number density

of ~ 1022 cm−3 are determined. The radiative neutron capture reaction rates on the boron 10-13B and carbon 12-14С isotopes are compared.
URANS assessment of ship extreme roll event in irregular stern quartering sea
Authors: Chen X , Liu L W , Zhang Z G , Wang X Z , Feng D K 
Published: August 2023

Abstract
In this study, the extreme roll events of a free-running ONR Tumblehome model in stern quartering seas are predicted by an unsteady Reynolds-averaged Navier–Stokes (URANS) solver coupled with a dynamic overset grid approach. The validation study is first performed for the prediction of ship extreme roll amplitude in regular waves, indicating satisfactory agreement with an average difference of less than 3% between the simulation and experimental results. The URANS approach is then applied to the assessment of the extreme roll events as the ship is sailing in irregular seas. The ship is free to 6 degrees of freedom (DOF) motions with a course-keeping control. It is concluded that the ship’s yaw motion plays an important role in the occurrence of ship extreme roll events in an irregular stern quartering sea. A rapid increase of yaw angle is observed for the ship coupled with the occurrence of the extreme roll, even leading to the capsizing.
Nonlinear computation for focused wave groups on abrupt depth transitions
Authors: Wu Q , Feng Xingya , Dong Y 
Published: August 2023

Abstract
Focused wave groups in intermediate water depth propagating over varying abrupt depth transitions are studied numerically and experimentally. The experiments well validate the fully nonlinear model by a conformal mapping method. The generation of second-order and third-order harmonics is observed near the top of the submerged step, as well as the decrease of the main (first-order) components propagating along with the step. In addition, an enhancement of kurtosis occurs just after the step with a high-trailed profile, revealing a considerable asymmetry of the surface elevations. In addition, a wave group passing two or three steps is also investigated numerically. More submerged obstacles effectively strengthen the reflection capability in terms of the reflection coefficients computed with the amplitude of wave envelopes. Although the harmonics manifest a higher risk of extreme waves on abrupt depth transitions, the increase of water depth changes might not further enhance the maximum skewness and kurtosis over the varying bottom.
Nonlinear wave propagation in a vegetated sandbar-lagoon system
Authors: Cong X , Kuang C P , Li H Y , Xing W , Chen J L 
Published: August 2023

Abstract
The sandbar-lagoon system presents a rich variety of values. At the same time, the degradation of ecosystems and coastal erosion caused by human activities and climate change are even more severe. A series of ecological conservation and restoration projects focused on vegetation rehabilitation have been implemented. However, there is insufficient scientific evidence to guide coastal engineering in the presence of vegetation. In this paper, ten tests were presented to experimentally investigate nonlinear wave propagation in a vegetated sandbar-lagoon system. The following conclusions can be obtained. In the absence of vegetation, the low-frequency wave energy proportion gradually increases with the rise of incident wave height. Double-peaked and even multi-peaked spectra are notable throughout the propagation in tests with larger incident wave heights. Wave height decay and wave energy dissipation due to vegetation effects increase as the incident wave height increases. The dependence of the wave energy dissipation induced by vegetation on the incident wave energy (the square of wave height) presents a linear relationship. Vegetation plays an important and complex role in both sea-swell wave and infragravity wave attenuation.
Absorption of wave reflections in way of an inlet boundary
Authors: Karola A , Tavakoli S , Mikkola T , Matusiak J , Hirdaris S 
Published: August 2023

Abstract
In recent years, Computational Fluid Dynamics (CFD) is increasingly becoming more attractive for the analysis of ship seakeeping. This is because of the increasing efficiency of computers and the accuracy of solvers (e.g. Reynold Navier Stokes Averaged – RANS) that may be more accurate in terms of idealizing nonlinear phenomena in comparison to potential flow methods. Notwithstanding this, RANS methods remain sensitive to accurate wave modelling across the fluid domain as well as the reflection of domain boundaries. This paper studies the effective absorption of the reflected waves from a structure heading back towards the inlet boundary with a relaxation zone method. This is achieved by applying the RANS CFD solver OpenFOAM-v2206 and wave generation toolbox waves2Foam. The modelled case is a 2D box in waves with different wave lengths. The distance of the relaxation zone and the distance after the relaxation zone until the box varies and their effect to excitation forces is studied. It is demonstrated that longer distances reduce the problems caused by wave reflections. The effects are reduced with coarser meshes as the mesh itself dampens the waves.
Numerical study of green water loads on a fixed structure with elastic sidewalls by MPS-FEM coupled method
Authors: Wu Mengmeng , Yang Guang , Zhao Weiwen 
Published: August 2023

Abstract
In rough seas, large masses of water will exceed the freeboard and cause violent slamming on the deck, known as green water. Due to its high destructive power, many scientists have devoted themselves to the study of green water. Given the complexity, various simplified methods have been used to study the mechanism and stresses of green water. In this paper, the loads and patterns of green water events on a fixed structure with rigid or flexible sidewalls were investigated using the solver MPSFSI-SJTU based on the Moving Particle Semi-Implicit (MPS) method coupled with the Finite Element Method (FEM). The rapid flow-structure interaction is generated by the wet dam-break method. Firstly, the numerical simulation of the water shipping events with the rigid structure was carried out, which was in good agreement with the existing numerical simulation results. Secondly, numerical simulations were carried out for different cases of fixed structures with elastic side wall and elastic upper wall. The influence of elastic modulus on wave loads and waveform was analyzed.
Numerical Evaluation of Hydrodynamic Coefficients in Roll Motion
Authors: Hwang E C , Yang K K 
Published: August 2023

Abstract
The determination of ship motions in a seaway heavily depends on hydrodynamic coefficients. However, the coefficients related to roll-motion exhibit nonlinear behavior due to viscous effects and relatively small wave damping, which pose significant challenges. To overcome these challenges, several studies have employed computational fluid dynamics (CFD) to analyze hydrodynamic performance, leveraging the advancements in computational performance. Nevertheless, limited research has investigated the error and uncertainty of these numerical solutions. In this study, we conducted a forced oscillation test on a ship-like section that induces lateral vortex shedding using the OpenFOAM with overset grid method. We validated the numerical results of the roll hydrodynamic coefficients with experiments and the results of potential theory. We used the procedure proposed by the ITTC to perform uncertainty analysis on the grid size and time step size, which presented the overall uncertainty of the numerical analysis results. Our findings indicate that the grid uncertainty of the added moment of inertia was significant in the low frequency region, while the time step uncertainty was significant in the high frequency region.
Comparative analysis of the long-term extreme VWBM calculated according to IACS Rec. No 34 rev 1 and rev 2
Authors: Mikulić A , Ćorak M , Parunov J 
Published: August 2023

Abstract
After facing some criticism regarding assumptions contained in IACS Rec. No. 34 Rev 1 (2001), efforts have been put in by IACS members resulting in a new revision of this document, which provides a procedure for computation of the long-term extreme wave loads on ocean-going ships. The main changes include a new scatter diagram, modification of the wave spectral model and energy spreading function, as well as probability level of design load. Preliminary, the reduction of extreme loads from 10% to 30%, depending on the vessel and response type, is estimated. As this reduction could have serious implications for ship structural design, the present research aims to further investigate consequences on the most important load component, i.e., vertical wave bending moment (VWBM) at midship. Transfer functions of VWBM are calculated using closed-form expressions, which are convenient for comparative studies where many computations are required. Ships of different types and sizes are subjected to the long-term VWBM analysis comparing extreme values based on the procedures proposed in Rev 1 and Rev 2. Although this study is not intended to provide extreme VWBM in absolute terms, the comparison with IACS UR 11 is nevertheless presented as a reference. It is found that Rev 2 long-term VWBMs never exceed corresponding IACS Rule values, which can’t be stated for Rev 1. Results also indicate that differences in scatter diagrams between Rev 1 and Rev 2 could explain a large decrease in the extreme VWBM.
Effects of variable porosity net on flow field inside deep-sea aquaculture cage
Authors: Yuan Xiaonan , Wang Chenyi , Miao Quanming , Zou Changfang 
Published: August 2023

Abstract
This paper focuses on the effect of the porosity of nets on the flow field inside the deep-sea aquaculture cage. Based on CFD method, the 2D flow fields inside and surrounding the deep-sea aquaculture cage from different views are simulated. The effects of certain porosity net and variable porosity net with different configurations on the fishability area, aquaculture efficiency and benefit of the cage are investigated. The results showed that the variable porosity net with suitable configurations in vertical direction can increase the fishability area and change the flow field inside the cage. This can be conducive to improving the efficiency of fish aquaculture. In horizontal direction, increasing the porosity of the nets parallel to the incoming flow direction can increase the fishability area and improve the water exchange capacity. This can be beneficial to improve fish aquaculture benefit. The results of this paper can guide for the selection of nets for deep-sea aquaculture cages.
Simulation of a floating solar farm in waves with a novel sun-tracking system
Authors: Wei Yujia , Ou Binjian , Wang Junxian , Yang Liang , Luo Zhenhua , Jain Sagar , Hetharia Wolter , Riyadi Soegeng , Utama IKAP , Huang Luofeng 
Published: August 2023

Abstract
The awareness of the energy and climate crisis has accelerated the development of renewable energy sources. Photovoltaic (PV) solar power plants harvest clean solar energy and convert it to electricity, which will be one of the most promising alternatives to the power industry in the context of a low-carbon society. Due to its low power density, the traditional deployment of PV systems on land or inland rivers requires much space. Therefore, industries are increasingly interested in expanding offshore Floating PhotoVoltaics (FPV) to oceans, where FPV has less influence on the marine environment and does not occupy precious space for land resources and human activities. This study performs a hydrodynamics-based structural response analysis for a novel FPV system in OpenFOAM. The wave-proof FPV platform is newly designed for this work, which integrated breakwater technologies to sustain the system’s survivability in harsh ocean-wave environments. Firstly, the rational mooring types for FPVs installed close to the island are studied considering seabed effects. Subsequently, extensive parametric studies have been conducted to determine a rational design strategy for the mitigation of wave impact. Several potential effects of the proposed platforms on the hydrodynamics in a coastal sea are evaluated for the first time.
Adaptive grid deformation method for CFD application to hull optimization
Authors: Wang Shuguang , Kim Yonghwan 
Published: August 2023

Abstract
This work introduces a new grid deformation method for an efficient CFD-based optimization of ship hull forms. The method uses a two-level point transformation technique to manipulate grid points with a small number of design points. At the first level, generic B-spline is employed to transfer grid points based on movements of control points sampled inside a control box, ensuring accuracy and smoothness of surface modification. At the second level, Radial Basis Function with Wendland’s C2 continuity is adopted to interpolate movements of control points based on relatively few design points. It is shown to be effective in preserving good mesh quality and efficiency. The method is applied to the deformation of hull surfaces for ship models KVLCC2 and KCS, and to investigate the effects of bulbous bow on calm-water resistance with fixed Lpp. A regression model is proposed for ship length, location of buoyancy, wet surface area, and displacement. Numerical results show that the present method is well-suited for CFD-based hull form optimization with better efficiency.