bluuebunny/crossref_metadata_2025_split huggingface dataset:
Web services selection a perspective of computational physics
Authors: Adarme M A , Jimeno M A , Puerto E G 
Published: August 2020

AbstractConcerning computational physics, web services are conceived as mathematical units that are experienced in different systems that offer service composition. Due to the exponential growth of web services and their deployment on cloud platforms, quality of service parameters have now become an essential factor when searching for and selecting services that must satisfy specific non-functional requirements of a user application. A variety of service components are highly configurable and are dynamic scenarios because a significant number of services can meet these requirements. This work analyzes the systemic perspective of approaches for the selecting and searching of web services that have specifications of optimization strategies based on the configurable quality of service parameters with test scenarios in cloud environments that have a considerable number of services as input. The study shows that policies based on artificial intelligence and related areas are the ones with the most significant convergence, and the approaches analyzed to give a perspective of future work aimed at strategies based on automatic learning.
Application of virtual technologies for the representation of physical phenomena in maintenance tasks
Authors: Dueñas Ramírez L M , Villegas López G A , Chamat Torres C P 
Published: August 2020

Abstract
Maintenance during industrial development has evolved, always seeking the in-depth study of the physical phenomena that occur in the elements and systems that have suffered functional failures. Maintenance has been adapted to each challenge presented. The progress and development of computer science have opted for the massive use of information and communication technologies that support industrial processes, generating new possibilities in maintenance management and operation. These tools could contribute to improving the efficiency of maintenance processes, taking into account that these costs represent a third of the total production cost in an organization. This work seeks to identify the evolution of these technological tools in the applications that they have had in representing the physical phenomena of maintenance management. This research also seeks to establish the minimum requirements that these tools must consider in their applications and uses. Considering the appropriation of these technologies in Colombia, in order to determine where the country is in terms of development and technological use, being important information for the recognition of the scenario and decision-making that prevail in a competitive Colombian industry world level.
Determination of connective heat transfer coefficients in an intermittent kiln
Authors: Guerrero Gómez G , Vera Duarte L E , Noriega Sánchez C J 
Published: August 2020

AbstractThe determination of heat transfer coefficients are parameters of great importance when evaluating thermal losses in a system. Therefore, the present work reports the convective heat transfer coefficients in different positions of a rectangular kiln for the production of artisanal ceramic materials, located in Ocaña, Norte de Santander, Colombia, from which the heat losses present in the were determined. As a result, a virtual instrument was designed for temperature acquisition, using a data acquisition card, as well as a chassis and thermocouples generating a temperature report and their respective temperature profiles. The determination of heat transfer coefficients are parameters of great importance when evaluating thermal losses in a system. The energy supplied by the fuel is 51.21 kJ and the energy loss in the walls and floor of the brick kiln is 17.67 kJ, which represents 34.51% of the energy supplied. The thermal gradient in the kiln is not homogeneous, affecting the quality of the products. This will be avoided by building the walls with refractory materials.
Physical-thermal straw properties advantages in the design of a sustainable panel-type construction system to be used as an architectural dividing element
Authors: Díaz Fuentes C X , Pérez Rojas M C , Mancilla J J 
Published: August 2020

Abstract
The walls in architecture determine the energy behavior of a home, the physical and thermal properties of the building elements are capable of controlling the energy transfer of to the interior, avoiding dependence on artificial cooling systems, which increase energy consumption. The research takes advantage of the physical-thermal attributes of straw, considering its use as a material, presenting sustainable constructive solutions for the walls configuration in rural houses with a warm tropical climate. The proposed design starts from identifying the properties of materials with a low carbon footprint such as straw, wood, cardboard, which are viable due to their low weight and easy obtaining. The result is the modular design of the EcoStraw panel that consists of a compressed straw matrix, embedded in a module whose function is to isolate the heat conduction between the interior and exterior, a modular and wooden support structure with the aim of giving structural stability in the stack and a cardboard laminate lining that acts as an interior closing surface. The constructive solution can be industrialized, economical and with a low impact on the environment.
Design of a high precision mechanical linear system for the study of the variables involved in the gas metal arc welding process
Authors: Lázaro Plata J L , Sánchez Rincón C S , Regino Ubarnes F J 
Published: August 2020

Abstract
The gas metal arc welding process is studied because of its high productivity and low cost. One of the drawbacks of this process is achieving repeatability of the welding seams. This article shows the design of a linear mechanical system that provided a high precision in the trajectory of the base platform. Three important factors were investigated such as platform speed, the main stresses present and the manufacturing material. A descriptive type methodology was used which consisted of conducting the study as a discrete particle system. The optimum conditions for the efficiency of its operation were a linear velocity of 1.44 mm/s, maximum shear stress in the power screw of 283.57 kPa, which was calculated by means of static analysis to determine as the material of medium carbon steel of type AISI 1040, which due to its ductility, facilitated the machining of the power screw. This provided a mechanical efficiency of 30.9%. The kinematic calculations of the system were made with standardized elements found on the market.
Testing stabilization of high-plasticity clays used in sloping terrain by adding sodium silicate
Authors: Flórez-Góngora C H , Garzón-Peña A T , Molina-Giraldo R D 
Published: August 2020

Abstract
High-plasticity clays can be stabilized by the addition of a small percentage of sodium silicate. Sixteen mixtures of 4000 g with different concentrations of sodium silicate at difference percentage were designed, to which were carried out physical, mechanical and chemical characterization tests that allowed to analyze the behavior at intervals of time. Physical, mechanical and chemical properties of the soil were evaluated. Using stabilization with sodium silicate in high plasticity clays, changes in the physical, mechanical, and chemical parameters of the soil were achieved. Having satisfactory results with 3% saturation, optimal concentration, at time intervals of 2 days and 1 month; Then as time passes the soil tries to return to its initial properties, which establishes that the concentration of the Silicate and its effect on the physical and mechanical properties of the soil should be checked over a longer time interval. Studying the physical, mechanical, and chemical parameters of high plasticity clays by adding multiples mixtures of sodium silicate contributes to the understanding of the soil behavior on the pressure condition.
Assessing wind and solar resources. Case study: department of Norte de Santander, Colombia, stage 1
Authors: Serpa Jimenez A M , Mogollon G , Gallardo Pérez H J 
Published: August 2020

Abstract
Renewable sources used to produce energy has gained momentum due to its environmental benefits and economic feasibility. Colombia has been part of the global tendency to develop non-conventional renewable technologies such as wind and solar and integrate those technologies into the energy matrix of the country. However, the lack of understanding of the wind and solar resources in some areas of the country including the department of Norte de Santander, Colombia, has limited the deployment of these technologies and the development of new projects. This research proposes an approach to assess wind and solar resources in the department of Norte de Santander, Colombia. Also, this paper discusses the physics behind the generation of energy from wind and solar sources and the contributions required from different backgrounds to help in the wide deployment of solar and wind energy. In this first stage, a rough technical concept is developed, and the proposed sites are selected based on publicly available maps of low resolution presenting average irradiance and wind speed, and proximity to electricity transmission infrastructure. The areas selected have a global horizontal irradiance ranging from 4.0 kWh/m2 to 5.0 kWh/m2 and wind speeds between 4.0 m/s and 6.0 m/s at 10.0 m height on average in a year.
Numerical Analysis of Inner Flow Loss Evolutions in a Low-Aspect Ratio Transonic Compressor Rotor at Windmilling Conditions
Authors: Li Da 
Published: August 2020

Abstract
This paper conducts a detailed numerical investigation to study the evolutions of flow topology and aerodynamic losses in a low-aspect ratio compressor rotor operating from freewindmill condition (near stall point) to highly loaded windmill condition (near choke point). Firstly, a simplified numerical calculation method based on energy transfer between rotor blade and working fluid is employed to capture the windmill points at low rotational speeds. Then, the influences of windmill on tip leakage loss are analyzed. At windmilling conditions, the tip leakage flow travels across the clearance from suction to pressure side and causes blockages near the pressure surface in the casing end-wall region, which is quite different from the flow phenomenon at freewindmill conditions. Finally, the influences of windmill on flow separations are investigated. In tip region, with the rotor operating from freewindmill to highly loaded windmill condition, the flow separation switches from suction surface separation to pressure surface separation, and both the intensity and size are increased. Unlike near the tip, the hub separations always appear on the suction surface and a radial growth is observed near the trailing edge at the highly loaded windmilling condition, which is not presented at both the near stall and windmill points.
Research on overflow diffusion characteristics of dredger
Authors: Shao Mingqi , Wang Jin , Ding Xuewen 
Published: August 2020

Abstract
Dredging engineering is widely used in port and waterway construction, water conservancy facilities construction, environmental protection dredging, land reclamation, subsea tunnel excavation and deep-sea mining, among which drag suction dredger is an important tool for dredging operation. During the process of its construction, the mud overflow process is an important link to realize the mud treatment of excavation. According to the actual engineering conditions, the loading and overflow process is an important part of the treatment of excavated slurry. With the increasing requirements of environmental protection, the related ecological pollution caused by dredging has become a hot spot today, and the diffusion of overflow slurry is one of the sources of pollution generated by dredging suction dredgers. Therefore, combining with actual engineering conditions, this paper adopts the theory of computational fluid dynamics (CFD) to study the diffusion characteristics, diffusion range, and influencing factors and proposes construction strategies to reduce its pollution impact.
Aero-thermal-elastic Coupled Simulations of An Air-cooled Turbine with an FDM solver
Authors: Guo Zhaoyuan , Wang Qiang , Dong Ping , Jiang Yuting 
Published: August 2020

Abstract
The aero-thermal-elastic coupled simulations of an air-cooled turbine vane were carried out by a developed coupled solver, HIT3D, employing the finite difference method. The pressure on the vane surface and the temperature in the solid vane were obtained by the coupled heat transfer simulation, then the single-way aero-elastic and thermal-elastic analysis on the turbine vane were performed. It shows that the predicted profile temperature employing the transition model agrees well with the measured one, the blade deformation caused by aerodynamic force is negligible, and that the greater thermal deformation and thermal stress locate at the blade leading edge pressure side and at the blade trailing edge, as the result of the strong temperature gradient and the constraint at the vane endwalls.
Study of a quantitative characterization parameter “oil and gas producing efficiency” of the producing degree of reserves in the developed area
Authors: Dai Jinyou , Wang Rui 
Published: August 2020

Abstract
Implementing the producing degree of reserves in the developed area is of great significance for timely understanding of oil and gas development trends in the developed area, and then taking targeted adjustment measures to improve oil and gas producing efficiency. On the basis of the analysis of different scale pore percolation capacity of reservoir and the study of four kinds of porosity (connected porosity, effective porosity, flowing porosity, filling porosity) and their corresponding calculation models of oil saturation, a quantitative characterization parameter - “oil and gas producing efficiency” of the producing degree of reserves in the developed area is proposed, and its theoretical discussion and case analysis are carried out. Research shows: 1) Oil and gas producing efficiency is the ratio of the reserves involved in percolation to geological reserves in the developed area of the oilfield, which is finally expressed as the ratio of the product of the flowing porosity and the original oil saturation of the flowing pores to the product of the connected porosity and the original oil saturation of the connected pores. 2) Reservoir flowing porosity and the original oil saturation of flowing pores are a function of displacement power, while the original oil saturation of connected pores is a function of reservoir forming power. Therefore, the oil and gas producing efficiency is essentially a coupling function of displacement power and reservoir forming power. 3) When the displacement power is greater than the reservoir forming power, the oil and gas will be fully developed, and the oil and gas producing efficiency will be 1; when the displacement power is less than the reservoir forming power, the oil and gas will be partially developed, and the oil and gas producing efficiency will be less than 1. 4) The calculation examples of X oilfield in Ordos Basin show that the connected porosity is 11.2%, the original oil saturation of the connected pores is 57.1%, the flowing porosity is 5.32%, the oil and gas producing efficiency is 0.832, and the oil and gas are partially developed. If the oil and gas are to be fully developed, the production pressure difference can be increased from 4.1MPa to 6.2MPa. 5) The study of oil and gas producing efficiency deepens the understanding of reserves producing status in the developed area of the oilfield, and has guiding significance for the targeted production adjustment and production pressure difference optimization of the oilfield.
Numerical investigations on influence of spacing of tidal current turbine array
Authors: An Qi , Wu Shuang , Liu Yanjun 
Published: August 2020

Abstract
In order to maximize the energy extraction potential from the marine resource, the primary task is to improve the power generation efficiency of multi-unit turbine arrays. There are many factors that affect the power generation efficiency of hydro turbine arrays. This paper mainly studies the influence of the effects of array structure parameters on the flow structure of the near-wake flow field and the energy utilization. The numerical simulation results are compared with the experimental data to verify the reliability of the numerical model. The double-row staggered arrangement of the turbine array is selected, and the size of the array structure parameter, the horizontal distance Dx and the vertical distance Dy, is changed to calculate a series of working conditions. The analysis of the results shows that when the horizontal distance Dx is 2.5RD and the vertical distance Dy is 2RD, the energy efficiency of the turbine array will reach the highest.
Research on the Pulsed Eddy Current Sensor of the Crack Depth of Turbine Disk
Authors: Xia Liu , Liu Lihui , Chen Dixiang 
Published: August 2020

Abstract
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Investigation of store separation characteristics by leading edge spoilers before supersonic cavity
Authors: Cui Pengcheng , Li Bin , Tang Jing , Chen Jiangtao , Li Huan , Mingsheng Ma 
Published: August 2020

Abstract
The internal cavity is widely used on new generation aircraft. However, there are some new aerodynamic and acoustic issues accompanied with the internal cavity. Store separation is a challenge when separated from a high-speed cavity, the store usually generates nose-up pitch moment due to the separated flow and large static pressure gradient, which is a threat to store separation safety. Leading edge spoiler is an effective passive flow control method to improve the store separation characteristics, however the effects of varisized leading edge spoiler on store separation characteristics are still unknown. In this paper, a parameterized leading edge spoiler model is established to investigate the store separation characteristics by leading edge spoilers flow control before supersonic cavity, a small aspect ratio fly-wing aircraft and a simplified store model are employed to simulate the store separation characteristics. Numerical results show that the leading edge spoiler lifts the shear layer and significantly changes the pressure distribution inside the cavity, which makes the store a nose down pitch angle during separation. The height of leading edge spoiler greatly influences the store separation characteristics for it changes the shear layer and vortex structure. The angle of spoiler and the gas between spoiler and aircraft also have great effects on store separation, larger angle and smaller gas lead to less nose-up angle.
The Point Interpolation Method for Static Analysis Using Quadratically Consistent Three-Point Integration Scheme
Authors: Chen Huihui , Jia Cheng , Gu Ying , Zhou Yujie , Ge Ziyu 
Published: August 2020

Abstract
The element free Galerkin method (EFG) is much interest in recent years due to its merits of only node information needed in constructing shape functions and high precision. However, its low computational efficiency becomes a technical issue in the simulation of realistic problems. To develop a more efficient and accurate method, the point interpolation method using quadratically consistent three-point integration scheme (PIM-QC3) is proposed, based on consistency framework for meshfree nodal shape function and its derivatives. And the shape functions along with corrected nodal derivatives at integration points, adopt quadratic basis, meet the differentiation of the approximation consistency (DAC) and the discrete divergence consistency (DDC). In addition, they possess Kronecker delta property and could enforce displacement boundary conditions simply. The T6-Scheme is utilized for node selection in constructing approximation, to avoid the singular moment matrix and make the computation of shape functions simple. Numerical results show the excellence of the proposed method in accuracy and efficiency of all tested methods. Specially, it is more efficient than three-point integration scheme based on element-free Galerkin method. The research in this paper could provide an efficient and reliable tool for analysis of engineering structure.
Quasi-static single bubble formation behaviour: interaction with adjacent induced flow structure
Authors: Zhao Ziwei , Hu Jun , Yu Yong 
Published: August 2020

Abstract
Single bubble formation behaviours which develops from submerged nozzle under the quasi-static mode in stagnant deionized water in a rectangular column are studied. Bubble formation behaviours are captured by a digital high-speed camera and information of the induced adjacent flow field is synchronously obtained via the particle image velocimetry (PIV) system. Interactions of induced bubble adjacent flow patterns with bubble formation behaviours are investigated at each stage of a three-stage bubble formation model. Results indicate that recirculation of the continuous phase near the bubble base accelerates rapid detachment of the bubble and the dynamic pressure variation in the liquid induced by bubble behaviours is the main reason why such flow pattern appears.
High-order simulation solving Navier-Stokes equations with Spalart–Allmaras turbulence model
Authors: Yang Li , Yue Lianjie , Zhang Qifan , Zhang Xinyu 
Published: August 2020

Abstract
The goal of this paper is to implement an accurate and robust solver for compressible Navier-Stokes equations coupled with the Spalart–Allmaras model, which possesses the capability of shock-capturing and predication of boundary layer and separated flow. In a given stencil width, a WENO-Z scheme equipped with Roe flux difference split method is used to calculate the inviscid flux, and central differencing scheme for the viscous terms are employed. The explicit Runge-Kutta is adopted for the temporal discretization. The simulation results of selected cases are given to verify the validation of the solver.
Measurements of velocity and droplet sizing in industrial applications using non-invasive laser systems
Authors: Lai W.T. , Zhang Xin , Yan T. , Xu D. 
Published: August 2020

Abstract
Many industrial applications involve the measurements of the velocity and size for the design of the products. Examples of such products are kitchen ventilator, water pump, household appliances and industrial oriented nozzles for fire suppression and paint. In the area of industrial safety, validation of the face mask for leakage is also an important aspect of the mask design. Fire suppression, paint nozzle, and mask filter are items which we encounter and rely on in our daily life. The design of products of those items to provide the best and optimal outcome is a critical aspect of the research and development in many industries. This paper covers two laser based techniques, Phase Doppler Particle Analyzer (PDPA) and Particle Image Velocimetry (PIV), for the design of fire suppression nozzles, paint nozzles, and N95 filter mask. The results of velocity profiles and droplet size distributions provided the critical information to evaluate the design and to allow corrections of deficiency in the process. Both the PDPA and PIV are non-invasive laser based techniques which introduce no disturbance to the flow and particle fields to be measured, giving the true representation of the measurement results.