bluuebunny/crossref_metadata_2025_split huggingface dataset:
Use of augmented reality technology and GPS to encourage tourism in the Sucre department
Authors: Salgado D. , Benitez D. , Morales A. , Gonzalez M. , Huertas N. 
Published: July 2021

Abstract
Globalization has boosted the tourism sector, making it one of the most important economic activities in developing countries in the 21st century, creating the need for urban growth through the construction of new physical infrastructures to guarantee accommodation, permanence, the security and mobility of large masses of people, putting the integrity of cultural heritage at risk. For this reason, the objective of this research is to design a system that integrates various emerging technologies, among which Augmented Reality and the Global Positioning System stand out, in order to develop digital content of cultural heritage and preserve its immaterial value., in addition to allowing the tourist to live a different experience when visiting the host place, superimposing digital information in the places they visit. The type of research is descriptive and technological development. Among the results found, the communication between the different technologies of the proposed system is outlined, as well as the flow of data that allow the functionality of the system. It is concluded that the proposed system contributes to the conservation of cultural objects and expressions through the generation of multimedia content and that it allows tourists to live an innovative experience through the proposed technologies.
Design of a telemedicine system for the provision of primary health care (PHC) services
Authors: Jaramillo D. , Mondragon M. , Morales A. , Sanchez S. , Romero H. 
Published: July 2021

Abstract
Currently, technological progress has allowed health-related issues to be worked on collaboratively, expanding their learning, managing to provide health services in remote places, guaranteeing one of the fundamental rights of every human being, among these technological advances are Telemedicine stands out, which has been playing a leading role especially in these times of pandemic. For this reason, the objective of this research is to design an information system that integrates multiple technologies to support the provision of primary health care services. The research is descriptive and technological development in scope. As a final result, block diagrams and flow diagrams were obtained to represent the set of technologies to be used and the information data flow of the proposed system. It is concluded that the proposed system would facilitate the provision of health services in areas with or without internet connectivity, as well as support decision-making by executives of health organizations, in addition, telemedicine is a new technological trend for what projects like this allow Colombia to be at the forefront in health and technology issues.
Evaluation of a virtual learning object with augmented reality technology for teaching of the computer parts
Authors: Romero I J , Romero H J , Sierra K A , Morales A D , Sánchez S A 
Published: July 2021

AbstractThis article refers to the evaluation of the Virtual Learning Object (OVA) Computer AR, OVA with augmented reality technology to facilitate the teaching-learning of the concepts of computer maintenance, related to the internal parts of the computer, with the sixth grade students of the COLMERCEDES educational institution. The methodological design with a quantitative and descriptive approach involved the application of the OVA quality assessment instrument called LORI (Learning Object Review Instrument), under OVA quality assessment dimensions and criteria, which determine that it is a quality digital teaching resource. The quantitative descriptive analysis focuses on the assessments of students and teachers when exploring the tool and its contents, aspects such as motivation, usability, accessibility, among others, are measured, so that the relevance of designing and using interactive virtual objects with augmented reality technology for teaching and learning the basic concepts related to the internal parts of the computer is concluded. Among the results obtained were positive, it was evident that the OVA designed met the quality criteria to obtain a high assessment by the population under study, concluding that it was appropriate to design an OVA with augmented reality to generate contributions to the teaching and learning processes on concepts related to the internal parts of the computer. The data in the dimensions of evaluation with a low tendency indicate that it should be complemented with a contextualized setting, so that it can be adapted to the characteristics and needs of the students.
Bibliometric review of emerging technologies in Gas Insulated Substations SF6
Authors: Gómez-Sandoval K Y , Marriaga-Márquez I A , Silva-Ortega J I , Grimaldo-Guerrero J W , Hernandez-Herrera H 
Published: July 2021

Abstract
The gas insulated substations (GIS) are made up of a set of equipment submerged in SF6 gas and a metal enclosure in which all the equipment associated with the substation is located. The GIS are being widely used in the high voltage electrical sector, due to this, developments and a high degree of research corresponding to new trends or emerging technologies that allow advances in this equipment are being presented. for this reason, this report contains a documentary investigation on the subject of isolated gas substations, through which a bibliometric analysis was carried out that allowed observing the high interest that GIS present in the scientific community in different parts of the planet. The objective of this work is to provide information corresponding to GIS such as some technical characteristics, a regulatory framework and new emerging technologies.
Recommendation system with graph-oriented databases for repository of open educational resources
Authors: Morales A. , Gonzalez J. , Alquerque K. , Reyes J. , Sanchez S. 
Published: July 2021

Abstract
The advancement of telecommunications has stimulated individualized study and collaborative learning, allowing the creation of pedagogical innovations by the teaching and administrative staff of educational institutions. Among these innovations are the Open Educational Resources (OER), which since its inception have contributed to teaching practices and contributed to the free learning of students. For this reason, the objective of the research is to design a repository of open educational resources integrating a recommendation system with graph-oriented databases. The study is descriptive and technological development. The results are the schematization of the system architecture by means of a block diagram and flow diagram.
Operation of a Dish Stirling Heliothermic System with Directly Illuminated Tube Receiver
Authors: Carrillo G E , Cárdenas Y 
Published: July 2021

Abstract
The generation of electricity from solar energy is one of the options within the renewable technologies that have gained much importance in recent years. Within this area, Dish Stirling systems stand out among solar concentration technologies, as they have the highest efficiency in converting thermal energy into electricity. Unfortunately, there are few publications and information on operating parameters of this type of technology. For this reason, this paper presents a methodology to characterize the behavior of this type of system, considering project parameters of a system installed in the city of Itajuba-MG Brazil. In the initial stage, a geometric and optical analysis is presented, which allows us to determine parameters such as the parabolic disk opening area and optical parameters that define the performance of this component. In the next stage, a thermal analysis is elaborated as a way to quantify the losses in the receiver system and to be able to calculate the energy supplied to the Stirling engine fluid. Finally, relationships are established to characterize the behavior of the Stirling engine working with a DIR type receiver. The results show that for speeds below 8 m/s, the heat loss due to radiation is higher than the loss due to convection, representing up to 90% of the total heat loss in the system, for solar irradiation of 1000 W/m2, the maximum electrical power obtained by the system was 0.99 kW.
Computational analysis of the mechanical behavior of carbon nanotubes in a rail-wheel system
Authors: García Carlos , Echeverri Mateo , Carlos Jesus , Suárez Gustavo 
Published: July 2021

Abstract
Currently, railway systems have presented many problems associated with friction and wear due to movement between the interface of the wheel-rail system, a situation that has been demanding large investments and railway costs in transport companies due to the frequent change of pieces of the system. As a possible solution, the addition of carbon nanotubes (CNTs) has been underway in some modified lubricants to increase the antifriction properties. In this investigation, computational simulations were developed to analyze the behavior of the CNTs as a reducing component of the friction of the material. A constitutive model was considered by Hooke’s law for the wheel-rail system and the CNTs. Numerical lattices were designed to develop the computational simulations. The constitutive equations were solved by the Finite Differences Method (F.D.M.). The computational models were subjected to transverse loads emulating the movement of the system. Simulations were performed for one wheel-rail model with insert of 0.01 percent of CNTs. The results identified in the report of the insertions of the CNTs in the wheel-rail system show a dissipative-absorbent behavior of the deformation energy is detected, combined with rotation effects of the CNTs, a condition that may allow a reduction in friction and wear CNTs can contribute to improve the tribological properties of lubricants in affected railway systems and a longer service life of mechanical elements. The computational developments carried out in this research can facilitate the analysis of behaviors of nanostructured materials under conditions of extreme functionality where the experimental processes are complex.
Generation and Capture of Electric Energy Using Piezoelectric Materials: A Review
Authors: Rincón-Quintero A D , Sandoval-Rodriguez C L , Zanabria-Ortigoza N D , Cárdenas-Arias C G , Ascanio-Villabona J G , Durán-Sarmiento M A 
Published: July 2021

Abstract
Piezoelectricity comes as a principle of transformation of mechanical energy into electrical energy, it is limited in terms of investment, time and research, due to this fact, the need arises to be able to innovate with data collection on the most used models to collect and generate electrical energy. In this research, the literature regarding the generation and collection of electrical energy using piezoelectric materials was analyzed, from this analysis, fifty innovative articles were determined in the last three years, which were reflected in a data matrix, in which It presents the generation and collection element, the applications, and shows the performance in terms of power or voltage that the prototypes supply. With the results of the table, a condensed panorama of current data is obtained, about the most used and outstanding of this form of little-used energy, but which is a competent and efficient alternative for the generation of electricity.
Implementation of a prototype water electrolysis system as an alternative to produce hydrogen
Authors: Tarazona-Romero B E , Sandoval-Rodriguez C L , Ascanio-Villabona J G , Quintero-Ruiz A , Páez-Castro R E , Acosta-Cárdenas O A 
Published: July 2021

Abstract
The objective of the development of the prototype or scale model of production of hydrogen and oxygen through the electrolysis process of water is to generate an alternative with a sustainable approach, which proposes the supply or source of energy initially with a direct current power source. replaceable in the future by a photovoltaic solar system. For the development of the prototype, it began with the academic compilation of information, then the model was made in CAD, followed by the need to integrate an electronic control system and a mechanical system to obtain the final model, materials were selected and used premises for the development of the two systems, the electronic and physical schematization was carried out, chaired by the assembly and field experimentation. It is important to highlight that the constructed scale model generates hydrogen and oxygen with a low current consumption and a constant voltage, the maximum point of gas generation is the maximum point of energy consumption and its relationship is almost linear.
Matrix design for guided bend tests under the codes AWS D1.1, AWS D1.5, ASME Section IX and standard NTC 523 for specimens with thicknesses equal to or less than 3/8 inches
Authors: Pinzón Candelario Manuel , Torres Bermúdez Germán , Serna Yhon F Soto , Zuleta J N 
Published: July 2021

Abstract
This article presents the design of a guided bending system, which allows integrating the AWS D1.1, AWS D1.5, ASME Section IX and NTC 523 codes. The study meets the requirements of these standards and reduces use of different matrices for testing specimens with thicknesses equal to or less than 3/8 of an inch.
Synthesis of starch powder from different organic wastes: A green approach to a valuable material
Authors: Sanabria D P , Farfán H I , Quintana D N , Abril I V , Castro H F , Paredes R A , Roa K L 
Published: July 2021

Abstract
Plastic pollution has become one of the main causes of irreversible damages to the environment. Despite the well-known adverse effects, the lack of culture in recycling is causing overcrowded landfills with tons of this disposable material. Developing new products is necessary to replace plastics with eco-friendly materials, in this way, biopolymers are a suitable alternative. Biopolymer synthesis requires a natural polymer known as starch, which is a common compound in roots, tubers, fruits, cereals and aquatic plants. In the present work, we study different solid organic wastes such as cassava, potatoes, plantain, corn and two types of algae Elodea Canadensis and Myriophyllum Quítense, in order to discover its feasibility as starch sources. For this purpose, we established an extraction method taking into account the main structure of each organic waste. By means of Fourier-transform infrared spectroscopy (FTIR) and iodine test, we obtained the chemical structures and principal characteristics of each starch. Synthesized powders exhibited characteristics of thermoplastic starches making them available for its potential use in biopolymers.
SEPIC - MPPT controller with photovoltaic energy for groundwater extraction
Authors: Corzo C L , Núñez R A , Flórez J I , Rodríguez P A , Plata K J 
Published: July 2021

Abstract

The model-based design methodology is presented for the development of an experimental SEPIC-MPPT controller powered by a photovoltaic module, designed to extract water from a deep well using a DC submersible motor pump. To specify the proposed methodology, a photovoltaic panel was characterized under various conditions of solar radiation and the modeling of its Voltage-Current relationship was carried out. The best tilt angle for the installation was determined to be nine degrees (9°). Similarly, a SEPIC controller was developed from model-based design. The results obtained showed an average adjustment error of less than 4%, on the performance parameters contrasted in the modeled / experimental system. The efficiency achieved by the SEPIC-MPPT controller was 85.26%. It is concluded that the methodology implemented for the design is coherent and valid for the development of SEPIC-MPPT controllers with application in underground water extraction systems, in areas with photovoltaic potential.
Extraction of Humic Acids from Different Origins: A Review
Authors: Quiroz-Urzola H , Castro-Suarez J R , Colpas-Castillo F 
Published: July 2021

Abstract
The synthesis of molecules such as humic acids is a good strategy for the remediation of eroded soils. Since the synthesis and extraction of these carbon molecules do not represent a process of energy liberation of the carbon, it is also a low-cost process. Bad practices in soils, such as the indiscriminate use of pesticides and pesticides, cause damage to the soil that can be difficult to reverse, depending on the type of exposure and resilience they have. For example, the Atlantic coast is the most affected by salinization, according to Ideam a phenomenon related to incorrect agricultural activities, devastating tourism, and the impact of the dry climate. Soil erosion is an effect that has a negative influence on activities such as agriculture since the erosion of the soils prevents or causes the agricultural activity to be low or almost nil. Humic acids are molecules that can retain cations in their macroporous structure. Therefore, it is important to study what is the affinity that these macromolecules have with the cations of Zn, Ca, K, Mg and therefore, to know with which of them the affinity is greater depending on the type of carbon studied. The objective of this monographic study is to review the conceptual part of humic acids, their different forms of extraction, and their applications reported by different authors working in this field.
Portable Device for Continuous Measurement (DIPORMEC)
Authors: Rodriguez-Arias H.A. 
Published: July 2021

Abstract
Nowadays, the conditions of the workplace are having a very important role in different areas. Therefore, a device was created to measure variables, for the time being, of quantity, of light, Lumens and Lux, temperature and relative humidity. Besides, this device continuously saves these variables in a file on an SD card to be analysed later. Another feature of this device is that it is portable which means it works with built-in batteries or with a universal connector, so that it can work easily in a workplace (offices). For this work it is shown how what we call cloning of the luminosity sensor was performed, for this particular case, with an LDR the amount of Lux is determined, taking as reference the light sensor of the Samsung A7 cell phone, and thus generating the equation that governs the sensor. In the connection diagram, the possibility of connecting other sensors that do not require adjustment work such as the one of brightness is left open, taking full advantage of the Arduino card’s capacity, but for the moment it is not part of the study of this work.
Radial distribution Systems solving in GAMS - Practice Implementation
Authors: Rojas-Martinez L A , Montoya OD , Martinez-Trespalacios J A , Rojas C. , Pacheco C. , Castro-Suarez john R. 
Published: July 2021

Abstract
In the following work, the practical implementation of a radial distribution system will be carried out. This work is done in the GAMS software. In the present work the analysis will be carried out to three radial systems of 10, 33, 69 nodes. In which it is expected to analyze the best location of distributed generation systems (GD) and batteries (B), in order to obtain an objective function (Z) that represent the best performance of each system. The systems have a single source of generation and will be assigned Distributed Generators and Batteries. In the same way taking into account the variation of the systems, it is expected to analyze the active power losses, the reactive power losses, the power of the battery and the charge state of the battery in a period of 24 hours. The analysis was done with the GAMS software.
Teaching equipment of newton’s second law
Authors: Gallego Becerra Hugo Armando , García Sebastián Martínez , Henao Melo Luis Guillermo 
Published: July 2021

Abstract
Mechanic is the branch of physics that is responsible for the study of the movement and balance of bodies in a system, within this can also be considered the bodies at rest. For the first case the scientist Isaac Newton considered the study of the movement of bodies, where he defines that any physical system which is subjected to different actions, as long as such actions are not nullified, will result in a change in the state of the body. The force is the magnitude that quantitatively measures the intensity, direction and direction of that interactions, having said that, if the summation of all forces of a system is different from zero, it can be concluded that the system will be in motion and therefore have an associated acceleration. Based on the above definition, was executed by the research group Design and Construction of Prototypes for Demonstration Experiments (DICOPED) in the design and construction of a prototype that allows to verify the Newton’s Second Law, looking to develop an autonomous, robust and low-cost prototype, that allows the use of the technology and tools present in the means, encourage and facilitate the teaching of basic concepts but no less important of physics to students of basic and higher education.
Enhanced thermal sensitivity in single metal thermocouple: significance of thickness-engineering of the metal layers
Authors: Mulla Rafiq , Dunnill Charles W 
Published: July 2021

Abstract
Single metal thermocouples (SMTs) have recently been developed with a new design concept of width-engineering of metal segments. In such designs, two segments of different micro-width are formed to obtain different levels of Seebeck effects. The variations in the Seebeck effect achieved from dissimilar segment width are small. In addition, the fabrication of such micro-width patterns requires special fabrication facilities such as photolithography or electron-beam lithography. In this paper, an alternative method is presented that has the potential to give high thermal sensing SMTs and requires no sophisticated facilities to fabricate. The method is based on thickness-engineering instead of width-engineering, and thus devices can be obtained from commonly available thin film deposition techniques. Constructing better thermal sensing SMTs is possible with this approach as thickness can be easily and conveniently varied down to nanoscale range which is necessary to achieve significant changes in the Seebeck effects from effectively utilizing size effects. As a result, a high thermal sensing bismuth based-SMT has been fabricated with a sensitivity of as high as 31 μV K−1, one of the highest values reported for SMTs. It is straightforward, more convenient over width-engineering approach and thus SMTs can be easily developed.
Symmetric and antisymmetric kernels for machine learning problems in quantum physics and chemistry
Authors: Klus Stefan , Gelß Patrick , Nüske Feliks , Noé Frank 
Published: July 2021

Abstract
We derive symmetric and antisymmetric kernels by symmetrizing and antisymmetrizing conventional kernels and analyze their properties. In particular, we compute the feature space dimensions of the resulting polynomial kernels, prove that the reproducing kernel Hilbert spaces induced by symmetric and antisymmetric Gaussian kernels are dense in the space of symmetric and antisymmetric functions, and propose a Slater determinant representation of the antisymmetric Gaussian kernel, which allows for an efficient evaluation even if the state space is high-dimensional. Furthermore, we show that by exploiting symmetries or antisymmetries the size of the training data set can be significantly reduced. The results are illustrated with guiding examples and simple quantum physics and chemistry applications.
Platypnoea-orthodeoxia syndrome in an older patient with COVID-19 pneumonia and orthostatic hypotension—a case of prolonged hospital admission
Authors: Ismail Muhammad Azam , Trevest Katie 
Published: July 2021

Abstract
An 89-year-old woman was admitted to hospital with a fall, general malaise and low oxygen saturations. She tested positive for SARS-CoV-2 and commenced on standard therapy for COVID-19 pneumonia. She improved initially but reported ongoing dyspnoea exacerbated by position. Following investigations to rule out other causes, she was given a diagnosis of platypnoea-orthodeoxia syndrome (POS). She was treated with gradual verticalization therapy with supplemental oxygen and subsequently discharged to an intermediate care bed (ICB).