bluuebunny/crossref_metadata_2025_split huggingface dataset:
El estilo de la crítica literaria en La máscara, la transparencia
Authors: Antzus Ramos Ioannis 
Published: October 2021

En este artículo estudiamos el estilo de la crítica literaria en La máscara, la transparencia (1975), la gran obra ensayística de Guillermo Sucre (Venezuela, 1933). Para llevar a cabo este análisis partimos de su propia concepción de la crítica y nos centramos en dos aspectos fundamentales: 1) la dialéctica entre el movimiento y la fijeza, y el intento de convertir el texto crítico en un absoluto verbal, y 2) la conciencia de que está tratando con palabras (y no con cosas), lo que da lugar a una actitud de pasión y de crítica con respecto a la propia escritura. Ponemos así de manifiesto cómo los postulados críticos de los que parte el autor permean su propia escritura ensayística.
Dual Fluorescence Emission by Irradiation of Single Optical Source for Fluorescein Sodium and 5-ALA Applications
Authors: Kwon So Yoon , Yoon Ki-Cheol , Kim Kwang Gi 
Published: October 2021

Abstract
Most brain surgeries aim to completely resection a tumor. However, the arrangement of blood vessels around brain tumors is often complex. Moreover, the tumors and blood vessels have similar colors, making it difficult to identify the boundaries between them with the naked eye. Fluorescent staining is a method used to distinguish the borders between brain tumors and blood vessels. The fluorescent contrast agents commonly used to observe tumors are 5-aminolevulinic acid and fluorescein sodium, which have different surgical sensitivities, depending on the type of tumor. In this article, a dual band bandpass filter with dual-wavelength emission for 5-aminolevulinic acid and fluorescein sodium is designed, and the dual-band bandpass filter capable of inducing simultaneous fluorescence emission of fluorescein sodium and 5-aminolevulinic acid was investigated experimentally to improve accuracy, speed, and energy efficiency in clinical settings. The possibility of dual fluorescence emission with a single irradiation is proposed. The efficiency of transmission and reflection (optical density) is 98% and 0.01%, respectively, and the bandwidth is 50% in the proposed filter. The proposed fluorescent dual-band filter has the advantage of saving energy, reducing auxiliary manpower and unit costs, and reducing operating room space requirements by producing two fluorescence diagnostic effects using a single equipment.
Importance of Three-Dimensional Vehicle Heat Exchanger Modeling
Authors: Schmid Michal , Paščenko Petr , Bozkurt Fatih , Petržela Pavel 
Published: October 2021

Abstract
This article demonstrates, via a comprehensive study, the necessity of using a 3D computational fluid dynamics (CFD) approach for heat exchanger (HTX) modeling within underhood vehicle simulation. The results are presented as the difference between 1D and 3D CFD approaches with a focus on auxiliary fluid (e.g., coolant) temperature prediction as a function of primary fluid (e.g., air) inlet conditions. It has been shown that the 1D approach could significantly underpredict auxiliary fluid inlet temperature due to neglecting the spatial distribution of primary fluid velocity magnitude. The resultant difference in the auxiliary fluid flow HTX inlet temperature is presented and discussed as a function of the uniformity index (UI) of the primary fluid flow velocity magnitude. In addition, the 3D HTX model’s importance is demonstrated in an industrial example of full 3D underhood simulation.
A Simulation Study on the Effect of Particle Size Distribution on the Printed Geometry in Selective Laser Melting
Authors: Sagar Vaishak Ramesh , Lorin Samuel , Göhl Johan , Quist Johannes , Jareteg Klas , Cromvik Christoffer , Mark Andreas , Edelvik Fredrik , Wärmefjord Kristina , Söderberg Rikard 
Published: October 2021

Abstract
Selective laser melting (SLM) process is a powder bed fusion additive manufacturing process that finds applications in aerospace and medical industries for its ability to produce complex geometry parts. As the raw material used is in the powder form, particle size distribution (PSD) is a significant characteristic that influences the build quality in turn affecting the functionality and esthetic aspects of the product. This article investigates the effect of PSD on the printed geometry for 316L stainless steel pow der, where three coupled in-house simulation tools based on discrete element method (DEM), computational fluid dynamics (CFD), and structural mechanics are employed. DEM is used for simulating the powder bed distribution based on the different powder PSD. The CFD is used as a virtual testbed to determine thermal parameters such as heat capacity and thermal conductivity of the powder bed viewed as a continuum. The values found as a stochastic function of the powder distribution are used to analyze the effect on the melted zone and deformation using structural mechanics. Results showed that mean particle size and PSD had a significant effect on the packing density, melt pool layer thickness, and the final layer thickness after deformation. Specifically, a narrow particle size distribution with smaller mean particle size and standard deviation produced solidified final layer thickness closest to nominal layer thickness. The proposed simulation approach and the results will catalyze the development of geometry assurance strategies to minimize the effect of particle size distribution on the geometric quality of the printed part.
Bayesian Experimental Design of Cyber-Physical Tests for Hydrodynamic Model Calibration
Authors: Abbiati Giuseppe , Sauder Thomas 
Published: October 2021

Abstract
An application of cyber-physical testing to the empirical estimation of difference-frequency quadratic transfer functions is presented. As an alternative to today’s procedure based on hydrodynamic tests with broad-banded or realistic (e.g., JONSWAP) wave spectra, tests in bichromatic waves are considered. The laboratory setup is the one developed by Sauder & Tahchiev (2020) that enables magnifying the sensitivity of the floater response to the low-frequency wave loading by adjusting the stiffness and damping parameters of a virtual soft mooring system. Bayesian experimental design is proposed to optimize the selection of the control variables (frequencies in the bichromatic wave and properties of the virtual mooring system) for a batch of cyber-physical tests. The experimental design algorithm is based on the recent work of Huan & Marzouk (2013). In a virtual yet realistic case study using an uncertain parametric quadratic transfer function, we demonstrate how the uncertainty of its describing parameters and other calibration parameters (low-frequency added mass and hydrodynamic damping) can be reduced. Results indicate that the proposed procedure has the potential for reducing experimental cost for calibration of hydrodynamic models.
Application of the Quemada Viscosity Model for Drilling Fluids
Authors: Knutsen Sandra , Cayeux Eric , Saasen Arild , Khalifeh Mahmoud 
Published: October 2021

Abstract
A number of different models are used to describe the shear rate dependent viscosity of drilling fluids. Most, such as the Herschel-Bulkley model, have a purely empirical basis. The Quemada model, while still empirical, is based on physical principles. It is based on the notion that structural units develop in the fluid at low shear rates which are then partially broken down as the applied shear rate increases.
In the current work, drilling fluid rheological data are fitted to the Herschel-Bulkley and the Quemada model. The development of the Quemada model and the calculation of each model parameter are presented. We show that the Quemada model better fits measurements over a wider range of shear rates than the Herschel-Bulkley model. We describe how to select the parameters of the Quemada model. Knowing the difficulty of obtaining a known shear rate for fluids with yield stresses, we discuss how this can affect the quality of the Quemada model fit. Furthermore, in principle, the Quemada model is not applicable in presence a non-zero yield stress. Therefore, we show how to handle the yield stress using a (very high) zero shear rate viscosity.
An Optimization Based Approach for Damage Identification of Idealized Ship Structural Assemblies
Authors: Silionis Nicholas E. , Anyfantis Konstantinos N. 
Published: October 2021

Abstract
Damage identification in ship structures is traditionally performed through on-site inspections. In this work, a first step is made towards assessing an in-line with operation ship hull Structural Health Monitoring system by registering onboard sensor data. Specifically, an optimization-based approach is proposed for solving the inverse problem for damage identification through processing static response data. Idealized geometry and loading conditions are considered for the deck and shell plating. Damage is abstractly represented as a single circular hole randomly located within the defined domain. Strain readings representing onboard measured data are provided by a FE model developed for this purpose. These correspond to zero-strain paths for each considered case: axial strains along the ship’s neutral axis on the side shells and shear strains along the deck’s centerline. Damage detection amounts to predicting its location, essentially considered the design variable of an optimization problem seeking to minimize an error function between strains measured for various damage scenarios and an indicative target scenario. Three established optimization algorithms are used for this task: a gradient-based, a Genetic Algorithm-based and a statistics-based method (Design of Experiments and Response Surface Methodology). Results indicate that the gradient and GA based approaches are more efficient while the less efficient statistics-based approach proved less computationally demanding.
Mechatronic Design and Maneuverability Analysis of a Novel Robotic Shark for Coral Reef Detection
Authors: Gao Liyang , Li Peng , Qin Hongde , Deng Zhongchao 
Published: October 2021

Abstract
In this paper, mechatronic design of a novel robotic shark for coral reef detection is presented. To obtain good maneuverability, a barycenter regulating device is designed to assist the posture adjustment of the robotic shark at low speed. Based on STAR-CCM+ software, the lift coefficients and drag coefficients of pectoral fin are calculated using overlapping grid technique. Based on Newton-Euler approach, a dynamic model with particular consideration of pectoral fins for three-dimensional motion is established. A CPG controller is used to generate rhythmic motion of each joint. Furthermore, based on the dynamic model, three-dimensional trajectory of spiral motion and swimming speed in different oscillation parameters are simulated. The results show that swimming speed of the robotic shark can be improved by increasing the amplitude and frequency or decreasing the phase difference. Also, oscillation frequency plays a more significant role. Furthermore, under the action of single pectoral fin, the robotic shark can achieve spiral motion and the turning radius is about 35.8m under the parameters set in this article.
Effect of Air Fraction on Force Coefficients in Oscillatory Flow
Authors: Vested Malene Hovgaard , Christensen Erik Damgaard 
Published: October 2021

Abstract
The forces on marine and offshore structures are often affected by spilling breakers. The spilling breaker is characterized by a roller of mixed air and water with a forward speed approximately equal to the wave celerity. This high speed in the top of the wave has the potential to induce high wave loads on upper parts of the structures. This study analyzed the effect of the air content on the forces. The analyses used the Morison equation to examine the effect of the percentage of air on the forces. An experimental set-up was developed to include the injection of air into an otherwise calm water body. The air-injection did introduce a high level a turbulence. It was possible to assess the amount of air content in the water for different amounts of air-injection. In the mixture of air and water the force on an oscillating square cylinder was measured for different levels of air-content, — also in the case without air. The measurements indicated that force coefficients for clear water could be use in the Morison equation as long as the density for water was replaced by the density for the mixture of air and water.
Cuttings Transport With Oil- and Water-Based Drilling Fluids
Authors: Ytrehus Jan David , Lund Bjørnar , Taghipour Ali , Saasen Arild 
Published: October 2021

Abstract
Deviated well sections are common in modern well construction. In mature areas like the North Sea region, practically all producers or injector wells will have highly deviated sections. These wells must be drilled and completed in an optimal manner with respect to drill time, cost, risk and functionality. Most cuttings transport and hydraulic models are developed based on tests with model fluids and often in small diameter test sections. Hole cleaning properties and hydraulic behaviour of field fluids differ from those of most model fluids. Furthermore, results from small diameter tests may not always be relevant for, nor scalable to, field applications due to time, length and other scale differences. Hence, there is a need for studies in controlled laboratory environments with various field application designed drilling fluids to improve engineering models and practices.
This paper presents results from laboratory tests using field applied fluids. The drilling fluids have similar density and viscosity within the relevant shear rate range applied during drilling operations and in the tests. One of the fluids is oil-based and the other one is an inhibitive water-based drilling fluid.
Effect of Bilge Radius and Bilge Keel Height on Roll Damping Performance of Floating Structures
Authors: Kwon Chang Seop , Kim Joo-Sung , Kim Hyun Joe 
Published: October 2021

Abstract
A round bilge with a bilge keel structure is a key element which can alleviate roll motions of ships and floating structures by transferring the roll momentum of a floating body into the kinetic energy of water. This study presents a practical guide to properly designing a bilge radius and bilge keel height of a barge-shaped and tanker-shaped FPSOs. A parametric study to figure out the effect of bilge radius and bilge keel height on the roll damping performance is conducted through a series of numerical roll free decay simulations based on Computational Fluid Dynamics (CFD). The bilge radius is normalized by the half breadth of ship, and the bilge keel height is normalized by the maximum bilge keel height which is limited by the molded lines of a side shell and bottom shell. In addition, it is investigated to identify how the roll damping performance of a rectangular section differs from the result of a typical round bilge section with maximum available bilge keel height.
Large-Eddy Simulation of Flow Past a Circular Cylinder Using OpenFOAM and Nektar++
Authors: Jiang Hongyi , Ju Xiaoying , Lu Yucen 
Published: October 2021

Abstract
Steady incoming flow past a circular cylinder has been a classical problem in fluid mechanics owing to its extensive practical applications in e.g. offshore engineering. In this study, large-eddy simulations are performed for flow past a circular cylinder at the Reynolds number (Re) of 3900. Particular focuses are on the comparisons of different numerical methods and computational domain patterns. The case Re = 3900 is computed with both OpenFOAM and Nektar++, which are based on the conventional finite volume method and the highorder spectral/hp element method, respectively. It is found that the computational cost for the Nektar++ model is only less than 10% of that for the OpenFOAM model. In addition, both circular and C-shaped domains are tested for the OpenFOAM and Nektar++ models. It is found that a circular domain is required for the OpenFOAM model to minimise the footprint of mesh non-orthogonality on the simulated flow, while the Nektar++ model does not have strict requirements for the orthogonality of the mesh. The present findings regarding the computational cost and the domain/mesh patterns are expected to be applicable to the numerical modelling of bluff-body flows in general. Based on Nektar++ and the circular domain, additional simulations are performed at Re = 1000 and 7000. For the three Re values investigated, the Strouhal number, hydrodynamic forces and the streamwise and spanwise vorticity fields are examined and compared.
Sea Trials Summarization on Fundamental Formation Control of Multiple Cruising AUVs
Authors: Fujiwara Toshifumi , Kim Kangsoo , Sasano Masahiko , Sato Takumi , Inaba Shogo , Okamoto Akihiro , Imasato Motonobu , Osawa Hiroyuki 
Published: October 2021

Abstract
In the 2nd term SIP project (SIP2), “Innovative Technology for Exploration of Deep Sea Resources” in Japan, National Maritime Research Institute, NMRI, is promoting the AUVs control system construction initiatively together with the leading agency, Japan Agency for Marine-Earth Science and Technology, JAMSTEC. To promote future high-level formation control, two types of fundamental formation control tests were tried using two AUVs and one ASV in the sea. One of them is virtual leader-follower control, and the other is centralized AUV control by one ASV. Seafloor topography mapping at the coast in Japan was successfully conducted by the two control methods with AUVs as test trials.
In this paper, the results of the fundamental formation control tests of them are reported and summarized. Detailed consideration of the test results is represented using a simple simulation of AUVs in the latter half of this paper. Moreover, the plan for the promotion of the formation control system that will be done in near future is introduced.
Evaluation of Cumulative Collapse of a LNG Carrier Hull Girder Under Dynamic Cyclic Bending Moments
Authors: Ji Jian , Liu Bin , Chen Lin , Liao Xianting , Guedes Soares C. 
Published: October 2021

Abstract
The present paper continues the recent work reported by Liu and Guedes Soares [1] where finite element simulations were conducted to investigate the ultimate strength of a container ship hull girder under cyclic bending moments. Here a membrane LNG carrier is investigated to evaluate the “cyclic ultimate strength” of this specialized ship hull structure including double bottoms, sides and decks. The paper aims to analyze the ultimate strength and to compare the collapse modes of a LNG carrier hull girder under monotonic and dynamic cyclic bending moments, revealing the difference in their failure modes. Nonlinear finite element method is employed, using the explicit LS-DYNA solver, to analyze the ultimate strength of hull structures. The numerical results show that the cyclic ultimate strength of hull structures is about 20% lower than the monotonic ultimate strength in the present study.
Ship Collision Analysis of Double Hull Structures in Various Ship Types
Authors: Chen Jie , Liu Bin , Villavicencio R. , Ji Jian , Guedes Soares C. 
Published: October 2021

Abstract
This paper elaborates the impact characteristics of double hull structures in various ship types including bulk carrier, container ship, LNG carrier and oil tanker. Their own structural configurations, such as the strengthened topside tank in the container ship, affect the crashworthiness of double hull structures in ship collisions. Two striking bows are modeled so as to evaluate the crashworthiness of the double hull structures. The calculations are performed using LS-DYNA to assess the impact characteristics of four struck ships. The ship collision analysis also discusses the assumption of rigid bow in conventional analysis and its effect on the evaluation of side structural crashworthiness. The numerical force-displacement responses and absorbed energy-displacement curves of various ships are compared. The comparison aims to reveal the discrepancy of the crashworthiness of the four typical double hull structures. It is of importance to analyze their structural characteristics for the design of crashworthy structures.
A Low-Cost Modular Image-Based Approach to Characterize Large-Field Wave Shapes in Glass Wave Flume
Authors: Fu Shuangjiu , Vronsky Michael , Alam Mohammad-Reza 
Published: October 2021

Abstract
Accurately determining water surface elevation and wave shapes in the hydraulic laboratory is critical for experimental research and physical understanding of ocean waves. Existing technologies such as wave gauges cannot capture the continuous wave profile across both space and time. This poses an issue, as nonlinear wave characteristics vary as a function of position and cannot be fully described using such point measurements. Furthermore, wave gauges are intrusive to the flow field. Alternative single-camera methods can’t capture wave characteristics in a large field-of-view properly without sacrificing resolution. In this paper, the authors propose an easy-to-use, low-cost method for measuring wave height and shape along the length of the flume over time. The method utilizes stitching of multiple web-cameras and the application of a Canny-based edge detection algorithm with experimentally determined thresholds and additional filters for maximum robustness and efficacy. Additionally, distortion correction is implemented in a computationally efficient manner. Video is acquired by three Logitech C920 PRO HD cameras recording at a resolution of 1280 × 720 at 24fps. The wave generator can generate waves with frequency between 0.1Hz and 1Hz. The experimental results show that wave height measurements can be obtained with a maximum resolution of 0.83mm with a relative error of ±1.5% when compared with a reference wave gauge measurement. This work demonstrates the ability to arbitrarily extend the horizontal field-of-view while providing more accurate measurement results.
Model-Inversion Feedforward Control for Wave Load Reduction in Floating Wind Turbines
Authors: Fontanella Alessandro , Belloli Marco 
Published: October 2021

Abstract
This paper develops a novel feedforward control strategy for reducing structural loads caused by waves in floating offshore wind turbines. The proposed control strategy is based on the inversion of a linear model of the floating wind turbine, and a real-time forecast of the wave obtained from an upstream measurement is utilized to compute a collective pitch control action. Two feedforward controllers are considered: one is designed to cancel the rotor speed oscillations and one to lower the towertop fore-aft shear force. The feedforward control strategies are implemented in a 10MW floating wind turbine, complementing the standard feedback controller for generator speed regulation. Numerical simulations are carried out in FAST, in four operating conditions with realistic wind and waves, proving the proposed feedforward controller effectively mitigates the structural loads caused by waves. In detail, the feedforward action reduces the loads spectra in the frequency range where linear wave is active. The best performance is realized higher winds (the FA force is reduced up to 25% in 22 m/s wind), where the wave excitation is the strongest.