bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bottom rack intake improvement as a fluid physics application through a computational fluid dynamics model
Authors: Calderón H E , Rada L M , De Plaza J S 
Published: November 2021

Abstract
This research focuses on improving the hydraulic behavior of a traditionally design bottom rack intake, from variations in roughness parameters, free height, and the inclusion of chamfers, establishing a contribution to the contrast between classical physics and the physics that takes over the partial resolution of the Navier-Stokes equations. To make possible the structure in OpenFOAM, it is necessary to use the geometric tool Salome-Meca, as well as a meshing tool (snappyHexMesh), and the InterFOAM solver in the processing stage. In the same way, through the turbulence model (K-E) local effects are evidenced in the Fluid-Structure interaction, as well as the identification of events and the development of the phenomenon of vorticity. The results show the improvement presented in some areas of the structure from the stabilization of the water flow through of the fluid-structure interaction change, the modification of the geometry and roughness, minimizing the presence of vertical vortices, cavitation, and surrounding areas. This allows us to conclude that traditional hydraulic do not consider the real physical flow behavior within the structure and neither the subsequent phenomena that develop, establishing as a starting point the need to rethink the design of the bottom rack intakes.
Design of a mechanical pedal valve to improve the use of water in plumbing systems
Authors: López Uribe L F , Sánchez Rincón C S , Díaz Jiménez M , Flórez Solano E 
Published: November 2021

Abstract
The use of water is a very important economic and environmental factor in all industrial sectors since the improvement in its use offers an optimization of this resource. The waste of water usually causes damages firstly to the environment by the supply sources, then to the industries by its high demand and to the hydrosanitary sources that the houses have. The valves have some control that allows a more comfortable use of this resource in sinks that provides some savings. Currently, there are valves that usually replace the traditional ones due to their automatic and/or mechanical operation, which allows for innovation and savings of this resource. In this sense, this research is oriented to the design of a mechanical pedal valve that allows a more comfortable and controlled control, thus granting the operator control in an immediate way, without wasting the fluid in the middle of the washing and avoiding a manual contact that in a certain way dissipates the risk of contagion of diseases such as Covid-19 by direct manipulation. An analytical methodology supported by computer aided drafting programs such as Ansys Fluent and SolidWorks was used. Finally, it was determined that, for the dynamic and static studies, the designed valve complies with the Colombian technical standard and the static design factors.
Physical and mechanical behavior of fine soil according to the content of multispecies diatoms
Authors: Zuluaga D A , Sabogal D , Buenaventura C A , Slebi C J 
Published: November 2021

Abstract
The physical response and geotechnical properties of diatomaceous soils are not fully understood, data are sparse, and do not account for the effects of single and multispecies frustule content, origin, type, and variability. The main physical problem lies in the irregular response of diatomaceous soils due to micro and nano scale causes and its unexpected effects on the macro scale. This research compared the characteristics of a multispecies diatomaceous soil sample (North American origin) with other diatomaceous single-species soils. Six artificial soil mixtures were prepared, dosed by weight, in order to determine the influence of the content of frustules. The results show that the liquid limit of the samples is lower than that of the monospecies samples for any content of frustules. The pore areas of the monospecies samples are found to be 4 to 7 times larger than those of the North American soil. Void ratios and compressibility ranges are higher as the diatom content increases. The internal friction angle of diatomaceous soils varies in a non-linear tendency with respect to fossil content. For the studied soil at 100% fossil concentration, the internal friction angle reached 38.32°, a magnitude that is lower than the values reported for most of the monospecies contrast samples.
Attitudes towards physics. A study with high school students from the Colombian context
Authors: Hernánez-Suarez C A , Gamboa-Suárez A A , Suarez O J 
Published: November 2021

AbstractScience education should promote the development of competent students in science and develop their interest in science; however, although the role and relevance of science within society is evident; the interest towards it is not conscious, being the negative attitudes of the students the main problem in the teaching of physics, which translates into a deficient knowledge and lack of scientific vocation. This report aims to diagnose the attitudes of students in high school physics courses. The study was developed through a non-experimental, descriptive research design, obtained from the application of a Likert scale that evaluates attitudes towards physics, adapted and validated to the context of students in an educational institution in Colombia. The results indicate that the attitudes of the students are slightly favorable, which is an empirical precedent to continue with the studies on attitudes towards physic. This should be considered to enhance the learning processes in these students, especially for those who have their first approach to physical concepts and give importance to attitudes when teaching.
Teaching of physics applied to engineering higher education by using English language: a literature review
Authors: Vargas Villamizar Ó H 
Published: November 2021

Abstract
The use of English as a second language is an increasing trend in higher education focused on non-native speakers, particularly for engineering programs interested in becoming actors inserted into the international academic context. However, the dual condition of both teaching engineering curriculum contents, and simultaneously using English language in non-native speaking contexts, entails risks and challenges that should be deeply understood. Considering this, results from a literature review are presented, built on articles from academic databases regarding use of two approaches, English as a medium of instruction and Content and language integrated learning, in engineering at higher education institutions, with specific interest in physics teaching, because of its relevance in engineering body of knowledge. As a finding, this topic has not been sufficiently studied in academic literature, and two focuses to carry out further research are suggested to contribute to the understanding of how to teach physics by using English language in non-native speaking contexts.
Tunable stiffness in fish robotics: mechanisms and advantages
Authors: Quinn Daniel , Lauder George 
Published: November 2021

Abstract
One of the emerging themes of fish-inspired robotics is flexibility. Adding flexibility to the body, joints, or fins of fish-inspired robots can significantly improve thrust and/or efficiency during locomotion. However, the optimal stiffness depends on variables such as swimming speed, so there is no one ‘best’ stiffness that maximizes efficiency in all conditions. Fish are thought to solve this problem by using muscular activity to tune their body and fin stiffness in real-time. Inspired by fish, some recent robots sport polymer actuators, adjustable leaf springs, or artificial tendons that tune stiffness mechanically. Models and water channel tests are providing a theoretical framework for stiffness-tuning strategies that devices can implement. The strategies can be thought of as analogous to car transmissions, which allow users to improve efficiency by tuning gear ratio with driving speed. We provide an overview of the latest discoveries about (1) the propulsive benefits of flexibility, particularly tunable flexibility, and (2) the mechanisms and strategies that fish and fish-inspired robots use to tune stiffness while swimming.
Fairness, effectiveness, and needs satisfaction: new options for designing climate policies
Authors: Büchs Milena , Ivanova Diana , Schnepf Sylke V 
Published: November 2021

Abstract
Financial compensations are often proposed to address regressive distributional impacts of carbon taxes. While financial compensations have shown to benefit vulnerable groups distributionally, little is known about their impacts on emission reduction or needs satisfaction. A potential problem with cash compensations is that if households spend this money back into the economy while no additional decarbonisation policies are implemented, emission reductions that arose from the tax may at least partly be reversed. In this letter, we compare the emission savings and impacts on fuel and transport poverty of two compensation options for carbon taxes in 27 European countries. The first option consists of equal per capita rebates for home energy and motor fuel taxes. The second option is the provision of universal green vouchers for renewable electricity and public transport, supported by additional investments in green infrastructures to meet increased demand for such green consumption. Results show that the first option of tax rebates only supports small emission reductions. In contrast, universal green vouchers with expanded green infrastructures would reduce home energy emissions by 92.3 MtCO2e or 13.4%, and motor fuel emissions by 177.5 MtCO2e or 23.8%. If green vouchers and infrastructure were provided without a prior tax, emission savings would be slightly lower compared to the ‘tax and voucher’ scheme, but fuel and transport poverty would drop by 4.1 and 2.2 percentage points, respectively. In contrast, taxes with rebates would increase fuel and transport poverty by 4.1 and 1.8 percentage points. These findings demonstrate that it is important to take environmental and energy poverty impacts of compensations for unfair distributional impacts of climate policies into account at the design stage. Such compensation measures can achieve higher emission reductions and reduce energy poverty if they involve an expansion of the provision of green goods and services, and if everyone is given fair access to these goods and services.
The implications of uncertain renewable resource potentials for global wind and solar electricity projections
Authors: Santos Da Silva Silvia R , Iyer Gokul , Wild Thomas B , Hejazi Mohamad I , Vernon Chris R , Binsted Matthew , Miralles-Wilhelm Fernando 
Published: November 2021

Abstract
Studies exploring long-term energy system transitions rely on resource cost-supply curves derived from estimates of renewable energy (RE) potentials to generate wind and solar power projections. However, estimates of RE potentials are characterized by large uncertainties stemming from methodological assumptions that vary across studies, including factors such as the suitability of land and the performance and configuration of technology. Based on a synthesis of modeling approaches and parameter values used in prior studies, we explore the implications of these uncertain assumptions for onshore wind and solar photovoltaic electricity generation projections globally using the Global Change Analysis Model. We show that variability in parametric assumptions related to land use (e.g. land suitability) are responsible for the most substantial uncertainty in both wind and solar generation projections. Additionally, assumptions about the average turbine installation density and turbine technology are responsible for substantial uncertainty in wind generation projections. Under scenarios that account for climate impacts on wind and solar energy, we find that these parametric uncertainties are far more significant than those emerging from differences in climate models and scenarios in a global assessment, but uncertainty surrounding climate impacts (across models and scenarios) have significant effects regionally, especially for wind. Our analysis suggests the need for studies focusing on long-term energy system transitions to account for this uncertainty.
Strong quantum nonlocality for unextendible product bases in heterogeneous systems
Authors: Shi Fei , Li Mao-Sheng , Chen Lin , Zhang Xiande 
Published: November 2021

Abstract
A set of multipartite orthogonal product states is strongly nonlocal if it is locally irreducible in every bipartition, which shows the phenomenon of strong quantum nonlocality without entanglement. It is known that unextendible product bases (UPBs) can show the phenomenon of quantum nonlocality without entanglement. Thus it is interesting to investigate the strong quantum nonlocality for UPBs. Most of the UPBs with the minimum size cannot demonstrate strong quantum nonlocality. In this paper, we construct a series of UPBs with different large sizes in d

A
⊗ d

B
⊗ d

C
and d

A
⊗ d

B
⊗ d

C
⊗ d

D
for d

A
, d

B
, d

C
, d

D
⩾ 3, and we also show that these UPBs have strong quantum nonlocality, which answers an open question given by Halder et al (2019 Phys. Rev. Lett.
122 040403) and Yuan et al (2020 Phys. Rev. A 102 042228) for any possible three and four-partite systems. Furthermore, we propose an entanglement-assisted protocol to locally discriminate the UPB in 3 ⊗ 3 ⊗ 4, and it consumes less entanglement resource than the teleportation-based protocol. Our results build the connection between strong quantum nonlocality and UPBs.
Combo separability criteria and lower bound on concurrence
Authors: Zangi S M , Wu Jian-Sheng , Qiao Cong-Feng 
Published: November 2021

Abstract
Detection and quantification of entanglement are extremely important in quantum information theory. We can extract information by using the spectrum or singular values of the density operator. The correlation matrix norm deals with the concept of quantum entanglement in a mathematically natural way. In this work, we use Ky Fan norm of the Bloch matrix to investigate the disentanglement of quantum states. Our separability criterion not only unifies some well-known criteria but also leads to a better lower bound on concurrence. We explain with an example how the entanglement of the given state is missed by existing criteria but can be detected by our criterion. The proposed lower bound on concurrence also has advantages over some investigated bounds.
Submersible power-generating unit as an alternative energy sources
Authors: Kolganov A V , Zemlyanovskiy V A , Guseinov Ch S , Portnyagin N N 
Published: November 2021

Abstract
There was proposed a compact underwater energy generating device in which energy is produced by underwater currents and tidal phenomena on the Arctic coast for small settlements. These communities will be created to track ships sailing along the Northern Sea Route and to provide operational assistance if necessary. The idea of the technical proposal is structurally distinctive, the device is carried out of a set of conventional pipes of a certain diameter with a fairly wide bell (funnel), horizontally mounted towards the underwater current. This idea is quietly new for Russia, and it’s learned not very well. Calculation was provided in a new way on the basis of Propellers theory. In result there are shown table with calculated efficiency of our turbines with defined quantity of turbines in machine unit. Also we suppose that our approach is more accurate then results obtained with Betz’s formula as so as Betz’s formula doesn’t consider geometrical option of impeller.
Validation and assessment of different RANS turbulence models for simulating turbulent flow through an orifice plate
Authors: Jurga A P , Janocha M J , Yin G , Giljarhus K E T , Ong M C 
Published: November 2021

Abstract
In the present study, numerical simulations using different Reynolds-Averaged Navier–Stokes (RANS) turbulence models are carried out to investigate the turbulent flow through the orifice plate at Reynolds number (Re) of 23000. The orifice thickness to pipe diameter ratio (t) and the orifice diameter to pipe diameter ratio (β) are fixed and equal to 0.1 and 0.5, respectively. The objective is to evaluate the behaviour of various RANS models with respect to the relevant flow parameters such as the pressure drop, velocity distributions and turbulence intensity profiles in the pipe by comparing the results with available published experimental data. The following turbulence models are studied: the k – ε, the k – ε Low Re, the k – ε RNG, the k – ε Realizable, the k – ω SST, the γ – SST, the EARSM and the k – ε Cubic models. It is found that based on the validation study of the flow through the orifice plate, the following models are in good agreement with experimental measurements: the k – ω SST, the γ – SST and the EARSM. They show a better performance than the k – ε model family in predicting the flow features which are important for the orifice flowmeter design.
Integrated computer digital decision for Offshore production automated management
Authors: Mukhina A G , Volkov D A 
Published: November 2021

Abstract
Rising requirements for the hydrocarbons production management system state are based on the industrial situation control necessity according to the environmental conditions. Development of the system construction and complexity indicates the integrative approach implementation reasonability for the producing capacity main indexes estimation and regularity of pace parameters evaluation as well as the layer productiveness level identification. Data processing and management tasks are the waymarks for the industrial multilevel structures models creation. Computer integrated model includes the estimated analytical tool for the extended operational functional support for the production parameters evaluation and technological process state diagnostics in changeable conditions and productive region origin and features traceability. Based on the well observations it is possible to apply the systematic approach for the trends occurrence and dynamics evaluation of the reservoir development time series data. And integrated decision includes the information value degree identification tool for the hydrocarbons production digital model updating.
Burst strength analysis of composite overwrapped pressure vessel using finite element method
Authors: Regassa Y , Lemu H G , Sirhabizu B 
Published: November 2021

Abstract
The purpose of this numerical study was to investigate the burst performance of a type III composite overwrapped pressure vessel (COPV) using finite element methods. An Aluminum overwrapped composites pressure vessel was modeled from four layers of carbon fiber/epoxy ply with 0.762 mm and arranged in two different sequences and orientations. The overwrap composite pressure vessel burst performance was examined by applying an internal pressure of 55 MPa on a ply arrangement of [-15°/0°/+15°/90°] and other research findings on [+55°/-55°] as an optimum filament winding angle were used for comparison purpose. Moreover a ply level orientation effect analysis, which is a superior feature of ABAQUS, was used for the composite modelling. The designed ply sequence and orientation exhibit a higher burst pressure at [0°] ply and minimum at [90°] ply orientation. The vertical COPV design displays a maximum stress along the axial direction that leads to the consideration of maximum vessel thickness to be along axial direction for burst resistant design of COPV.
Numerical stress analysis of tubular joints
Authors: Santacruz A , Mikkelsen O 
Published: November 2021

Abstract
The finite element analysis (FEA) presented in this paper pertains to the stress analysis of both the welded tubular T and X joints and is aimed to assess both the importance of the presence of the weld geometry and the suitability of shell and solid elements with regards to the FEA of welded tubular joints and, additionally, to confirm or dispute a correlation between the standards AWS D1.1 and DNVGL-RP-C203 with regards to the minimum size of the weld geometry. Using symmetry, three unit-load cases are investigated: axial loading, in-plane and out-of-plane bending. The results indicate that the FE models acknowledging the presence of the weld geometry and using solid elements are more suitable for the FEA of welded tubular joints and, moreover, the stress concentration factor (SCF) obtained at the chord “crown” location from the FE models subjected to the axial load case either approach, as in the case of the welded tubular T joint, or surpass, as in the case of the welded tubular X joint, the value estimated from the parametric equations as given in DNVGL-RP-C203.
Recent work and prospective analysis on offshore structures and marine energy harvesting at the Faculty of Engineering of the University of Porto
Authors: Taveira-Pinto F , Rosa-Santos P , Fazeres-Ferradosa T. 
Published: November 2021

Abstract
Marine energy harvesting and offshore structures for marine renewable energy exploitation rise as a trending topic of both research and industrial activities. However, many challenges are yet to be tackled and solved when it comes to place such equipment and structures at sea. Over the past years the Marine Energy Group at FEUP has been tackling some of those challenges aiming at a better competitiveness of marine renewable energy in comparison to traditional oil & gas sector, which is more mature and developed at this point in time. Additionally, recent findings of this research team have also been applicable to several offshore oil & gas infrastructures. In this work, the latest contributions, projects and research outcomes developed by the team are reviewed and presented towards the enhancement of future research lines and industrial opportunities.
FRP pipeline performance in tensional and torsional S-lay installation loads
Authors: Pavlou Dimitrios 
Published: November 2021

Abstract
The loading conditions of a composite pipeline is the main factor for its dimensioning. During S-lay offshore installation of multilayered FRP pipelines, severe tensional and torsional loads take place in the above sea part of the pipeline. Since the wall pipe is multilayered and the material properties of the laminae and the laminate is anisotropic, the maximum stresses depend on the stacking sequence. In the present work, an analytical model is proposed for calculating the capacity of multilayered FRP pipelines to carry axial and torsional loads. Numerical results for typical multilayered filament wound E-Glass/Epoxy pipelines under axial tension and torsion are provided and discussed.
Research of the possibilities of the existing transport system in Russia for the transportation of goods and methane-hydrogen mixtures for export
Authors: Abukova L , Safarova E , Filippova D , Stolyarov V 
Published: November 2021

Abstract
The theory of using hydrogen and hydrogen-methane mixtures (HMC) assumes the operation of an industrial cluster created in the presence of significant reserves of methane, excess electricity, trunk pipeline facilities for transportation and storage, as well as contracts for the supply of mixtures to the domestic market and export. For a balanced decision on the use of existing facilities of the gas transmission network and underground storage facilities for methane-hydrogen mixtures, determination of transit volumes, additional research is required in order to take into account the peculiarities of the behaviour of hydrogen and its mixtures. The authors carried out work to systematize the features of production and storage, assess the consequences of accompanying negative effects to maintain the operational reliability of the production complex. Taking into account the preliminary results, additional research and the adoption of national and industry standards are required before starting significant investments in the creation of a hydrogen energy industry.