bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rules for teaching to deaf students: A creative action that overpass the inclusive education
Authors: Pilonieta-Cortés L , Martínez-Lozano J J , Vergel Ortega M 
Published: November 2019

Abstract
The research aims to create guidelines to guide pedagogical processes for hearing-impaired children. The methodology used was supported for a qualitative paradigm, oriented under the ethnomethodology, type field; used was observation techniques and non-structured interviews. For this effect was selected teachers that works with deaf students as key informers in different schools from Bogotá-Colombia. Results show that learning times of deaf students and hearing students are different, who are associated with a specific pedagogical and didactic strategy. It is concluded that guidelines in teaching deaf children incorporate adaptations that implement tangible visual material, experiential and experimental projects.
Mobile devices for the development of critical thinking in the learning of differential equations
Authors: Rincón Leal L , Vergel Ortega M , Paz Montes L S 
Published: November 2019

AbstractThe purpose of this research was to establish a relationship between mobile devices and the development of critical thinking in students of the differential equations subject. The research had a quantitative and qualitative methodological approach with quasi-experimental design, the sample was 110 students. Results: The integration of mobile applications favored and motivated the learning of the applications of differential equations, where the student develops critical thinking at the moment that creates, discovers, imagines and assumes. At the same time, when interacting with colleagues, it implements autonomous and collaborative learning, with the ease of access to information. Conclusion: Regarding the perception of students about this tool, 40% highlight its usefulness in understanding the topics and 51.2% step by step methodology. The average age of the students was 20 years with a standard deviation of 2.01 years.
Fostering mathematical logical intelligence in primary school students
Authors: Márquez Patiño R A , Gallardo Pérez H J , Vergel Ortega M 
Published: November 2019

Abstract
Education must form thinking people, who develop all their potentialities, among them, those referring to mathematical logical intelligence. The objective is to elaborate a didactic proposal that fosters mathematical logical intelligence in students. For this, the research was framed in a quantitative approach with fieldwork design and at a descriptive level. The survey was applied as a technique and as instruments a questionnaire for teachers and a test for students. The population was made up of all teachers and students in basic primary education. An intentional non-probability sample was applied, made up of 22 teachers who attend primary school programs and 30 students of the same educational level. The results identify the lack of strategies related to the processes of classification, serialization, and number of primary school teachers during their pedagogical work. Next, we describe the shortcomings that students have in applying mathematical logic processes in a series of activities proposed in the evaluative test. Finally, didactic strategies are defined according to the conditions of the learning environment analyzed so that from the work of the classroom it is possible to promote logical mathematical intelligence in the students.
Mathematical entrepreneurship in educational institutions
Authors: Palácios R A Fonseca , Paz Montes L S , Alvarez Paz D M 
Published: November 2019

Abstract
In the present investigation, a reflection was made on the teaching practices in the area of mathematics that entails educational institutions conducive academic spaces to generate entrepreneurial attitudes in students. These are personalized from the voices of the participants, involving the student in the development of the entrepreneurial culture and in the basic competences generated from the mathematics. The complexity present in the teaching practice becomes significant in the student when it is possible to establish an interrelation with their social, cultural, economic environment and, above all, in the proactive action that the student develops in the face of any situation in life. A new feeling that allows manifestations in students of: autonomy, responsibility, innovation, creativity and to generate in them citizen awareness.
Development of math skills in first semester students of public accounting
Authors: Alvarado gallardo O A , Gallardo Pérez H J , Vergel Ortega M 
Published: November 2019

Abstract
This research project describes the results of applying two pedagogical methodologies: problem-based learning and the use of new information technologies through GeoGebra in the development of the theme of functions for students of public accounting. The research was developed from a positivist paradigm, quantitative approach of quasi-experimental type of pretest and posttest with control and experimental group. In order to determine the development of competencies, a diagnostic test was initially applied to evaluate the mathematical knowledge with which the students enter; then pretest and posttest tests were applied to the control and experimental groups, in which by means of an intervention plan to the experimental group in the posttest stage, favorable results were evidenced by improving the proportion of correct answers and the development of competencies in geometric algebraic reasoning compared to the pretest stage. One of the conclusions reached in the research is that applying other methodologies in class such as problem-based learning with the support of GeoGebra software encourages the process of teaching learning and students find applicability to the topics treated by associating them with situations of practical life.
Mathematical argumentation in the classroom
Authors: Salazar-Torres J , Vera M , Contreras Y , Gelvez-Almeida E , Valbuena O , Barrera D , Rincon O 
Published: November 2019

Abstract
The article shares some elements of comprehensive type about “mathematical argumentation in the classroom”; whose analysis, was made from two fundamental categories in the development of an oral mathematical argumentation process for the conviction, contradiction and validation of a written mathematical argumentation process. The research addressed two central categories of argumentation as a discursive form, the first one is the epistemic position, and the second one is the discursive position that students unveil at the time of mathematically arguing the solution to a problem situation. The research was developed under the interpretative paradigm through the design of a case study directed by the theory and technique of a focal group, for the collection of information. In the findings, difficulties in the passage were evidenced from the semantic to the theoretical from the epistemic position; regarding the discursive position, the presence of three discursive forms was revealed: description, explanation and argumentation, the latter being the least used by the students.
Experimental study of turbulent syngas/methane/air flames at a sub-atmospheric condition
Authors: Cardona A , García A , Cano F , Arrieta C E , Yepes H A , Amell A 
Published: November 2019

Abstract
The aim of this work was determined turbulent burning velocities of air-syngas-methane flames at sub-atmospheric conditions using the angle method and Schlieren imaging. We analyzed a high hydrogen content syngas that can be obtained with a Conoco-Phillips coal gasification process. Equivalence ratios evaluated here correspond to lean combustion conditions: 0.8-1.0. Experiments were carried out at room temperature of 297 K and 849 mbar. The chemical-turbulence interaction was evaluated considering geometric parameters, laminar flame properties, and turbulence length scales. It was found that the turbulent burning velocity and the ratio between turbulent and laminar burning velocities increases with the turbulence intensity. Additionally, the addition of syngas to methane increases the laminar and turbulent burning velocity.
Drinking water treatment sludge as a partial substitute for clays in non-structural brick production
Authors: Fonseca Herreño L C , Valdés Solano D M , Rodríguez Sarabia K D , Cabello Pérez J O , Muñoz Quintero A A 
Published: November 2019

Abstract
The sludge as by-products of the water treatment is composed of particles of sand, silt and clay, colloidal organic matter and chemical substances that have been added to the water source during the treatment processes, this has aroused interest in its study as an economic and sustainable alternative in the making of non-structural and ornamental materials, among others. This research was carried out in a water treatment plant in the municipality of Ocaña, Colombia, which does not have a system for the adequate treatment and final disposal of the sludge generated, resulting in the discharge of this waste directly into the body of water, Algodonal river. Sampling of the sludge was taken from the plant for the analysis of its physical properties; subsequently, bricks with different mixing ratios are made and subjected to resistance tests according to national and international standards. It was found that the sludge generated in the sedimentation tank of the water treatment plant has a potential for the manufacture of non-structural brick, taking into account that the results of the tests showed similar or superior properties in comparison with a commercial brick produced in the region.
Methodology to determine the wear on the cutting tool during milling-planning in a computer numerical control machining center
Authors: Espinel-Blanco E , Arévalo-Ruedas J H , Florez-Solano E 
Published: November 2019

Abstract
The increased service life of cutting tools used in material removal processes results in significant savings in terms of production time and costs. Machining downtimes, especially those related to tool changes, represent a significant percentage of machine downtimes, which reduces efficiency. A proposed methodology is presented for the analysis of the behavior of the cutting tool through the application of the ISO standard, for which roughness and wear were determined and micrographs were used as indicators for the verification of the condition of the tool. The effectiveness of the proposed methodology that can be used in manufacturing processes to avoid failures in the workpiece due to improper use of the cutting tool was tested.
Carbon dioxide mixtures for organic power cycles using waste heat sources
Authors: Noriega Sanchez C J , Afanador García N , Guerrero Gómez G 
Published: November 2019

Abstract
The theoretical study proposed here is based on the energy recovery of sensible heat sources of medium and low temperature levels from Rankine power cycles in which binary mixtures of carbon dioxide and organic fluids are the working fluids. In this sense, the impact of these blends on performance parameters in the basic Rankine cycle configuration is addressed, as well as, optimization analyses of global conductance to ensure the highest production of net power cycle. The results allowed identifying what mixtures stand out in each performance indicator, particularly at net power and first law efficiency.
Impact of information and communication technologies on organizational learning
Authors: Manzano O , Peñaranda M , Páez H 
Published: November 2019

Abstract
The use of information and communication technologies a strategic tool has become one of the greatest benefits that has given a total shift to the different tactics that could be implemented to improve processes within organizations. The purpose of the research was to determine the relationship between information and communication technologies and organizational learning in the “micro, pequeñas y medianas empresas” of the city of Ocaña, Colombia. The focus of the research was quantitative correlation type; with non-experimental transactional field design given that the impact of the information and communication technologies variable on organizational learning was analyzed at a moment of time and without manipulating the variables. In order to collect the information, a Likert instrument with a Cronbach’s Alpha coefficient of 89.70% was validated. The results through the analysis of variance could show that information and communication technologies have a positive and significant impact on the organizational learning variable. The calculated correlation coefficient was 72.30%, showing that there is a high and positive correlation between the two variables. The information and communication technologies tools that managed to improve the competitiveness of companies are intranet, email, video conferences, social networks, search engines, document management, electronic commerce, databases and support applications for each type of organization.
Numerical analysis of the influence of friction conditions on the pile-up effect in Vickers hardness measurements
Authors: Trzepiecinski T , Lemu H G 
Published: November 2019

Abstract
Vickers indentation load-depth curve may be used to determine basic mechanical properties of metallic materials such as hardness, yield stress, modulus of elasticity, and elastic and plastic work. The pile-up phenomenon observed during indentation causes underestimation of the projected contact area and the diagonal dimensions of the impression in different hardness measurement scales (nano-, micro-, and macro-). The aim of this paper is to conduct a numerical analysis of the effect of friction conditions on the pile-up phenomenon during testing of DC04 steel sheet. The mechanical properties of the sheet metal used for the modelling purpose were first characterized by tensile tests on samples cut along the rolling direction (0°), transverse to the rolling direction (90°) and at an angle of 45° to the rolling direction. The numerical computation was conducted using ABAQUS, which is one of the powerful finite element-based programs. A wide range of variation of friction coefficients, i.e. 0-0.3 has been used in the analysis. It has been observed that the results of indentation of anisotropic materials are significantly affected by friction. The difference in the pile-up height measured at rolling direction of sheet metal and transverse to the rolling direction decreases with the reduction of the maximum displacement of the indenter. For higher values of the coefficient of friction, the higher the value of the indenter displacement, the lower becomes the increase in the pile-up height value.
Contact stresses associated with the wedge-lock mechanism in a prototype subsea pipeline recovery tool
Authors: Xing Y , Eriksson N B , Ong M C , Knutsen C 
Published: November 2019

Abstract
This paper examines the contact stresses associated with the wedge-lock mechanism in a prototype subsea pipeline recovery tool (PRT) through numerical methods and experimental testing. The prototype PRT studied combines IK-Norway subsea plug technology in a subsea PRT. This allows the PRT to seal the subsea pipeline while it is being retrieved. The PRT can then flush the pipeline before retrieval and therefore providing for operational cost savings. This paper presents the first stage of the study which the sealing mechanism is not studied. The current wedge-lock mechanism uses a cone to press steel balls against the insides of the subsea pipeline thereby locking the PRT to the pipeline. Designing for sufficient contact stresses is critical to ensure that the PRT can grab the subsea pipeline tightly in order to ensure a successful recovery. The contact pressure distribution between the ball and cone in the wedge-lock mechanism is modelled using finite element method in Ansys. The resulting indentation depths occurring at the pipeline are compared against physical tests. It was found that the contact problem associated with the wedge-lock mechanism is complex and the actual contact stress/final gripping force is sensitive to the input parameters. Second, the results show that the Ansys numerical model is able to represent the contract stresses fairly accurately if the friction coefficient is well-controlled. Third, it was observed that a low friction coefficient ensures low indentation depths. Last, the results highlight that an increase in the cone-angle leads to a decrease in the indentation depth.
Implementation of linear, double-linear, and nonlinear fatigue damage accumulation rules for fatigue life prediction of offshore drilling top-drive tie-rods
Authors: Inoma J E , Pavlou D G , Zec J 
Published: November 2019

Abstract
The offshore oil and gas industry has been exposed to major challenges over the last decade, particularly demanding cost cuts and more effective technical solutions. Predictive systems and remaining life assessments for both machine and structural components are known to be one of the core areas that has gathered much attention lately. This paper focuses on multiaxial fatigue that is a problem in number of engineering structures and equipment. The ability to properly assess and quantify multiaxial fatigue of offshore equipment and structures has major benefits for owners of engineering assets both in terms of technical and safety integrity. Traditionally, Palmgren-Miner’s damage rule is used for life estimation involving multiaxial fatigue due to its ease of use. There are however some known shortcomings with Palmgren-Miner’s rule namely: it does not consider the loading sequences. This for instance can result in overestimation of fatigue life in scenarios where stress amplitudes are decreasing, and moreover underestimation of fatigue life in scenarios where stress amplitudes increase. This research work thus involves closely studying the application of Palmgren-Miner’s linear damage rule, Manson’s double linear damage rule, and Subramanyan’s non-linear damage rule for the purpose of enhancing the predictability of damage as well as accuracy of fatigue life assessments. Each of these techniques were applied for tie-rods of an offshore drilling top-drive having a known stress history. The loading histories were provided by a drilling company. The torque and axial force values are transformed to stress components for the corresponding critical spots. The “rainflow” counting technique is applied to the obtained stress histories and the mean stress effect is considered for the damage accumulation calculations. The fatigue life prediction of the three models are justified and discussed. This research work was aimed at contributing towards the utilization of more robust fatigue life estimation techniques such as Manson’s double linear damage rule and simplified non-linear damage rules which capture the true nature of the fatigue that equipment’s are subjected to, and thus to improve the reliability of the fatigue life predictions.
Predictive maintenance (PdM) analysis matrix: A tool to determine technical specifications for PdM ready-equipment
Authors: El-Thalji I 
Published: November 2019

Abstract
Predictive maintenance (PdM) and operations optimisation are expected to generate the highest industrial and societal impact within the oil and gas industry. Such an optimistic expectation requires several changes in asset design and maintenance management. Nowadays, design for maintenance and maintenance support needs are mainly guided by the IEC 60706-2 standard. However, Designing for PdM ready-equipment is not yet part of that standard. To design PdM ready-equipment a specific analysis method shall be performed to evaluate the technical requirements and specifications of designed equipment to be PdM ready. Therefore, the purpose of this paper is to propose and demonstrate a PdM analysis method that helps to specify the technical specifications to monitor and predict the health of a specific physical asset. The proposed matrix is an evolution of further development of failure Mode, effect and criticality analysis (FMECA) and failure mode symptoms analysis (FMSA) rather than a revolutionary analysis. The case study method is used to extract stakeholders needs of what they expect from PdM analysis (PdMA) and how practical such type of analysis shall be. The developed PdMA matrix shows a simple relation between failure (their modes/levels) and measured abnormal symptoms and tracking and prediction indicators. The electric generator is used to demonstrate the use of the matrix. The PdMA matrix can be developed further to be more quantitative by including the probability of detection and probability of prediction.
A web based solution to track trawl vessel activities over pipelines in Norwegian Continental Shelf
Authors: Farmanbar M , Palanisamy A , Høydal A B , Keprate A , Haug G 
Published: November 2019

Abstract
Vessel activities such as trawling and anchoring potentially affect pipeline integrity. Therefore, the detailed information about the trawl activity in the area is essential for accurate assessment of pipeline, where to inspect and where to implement corrective intervention, based on up to date trawling intensity and equipment used. The main contribution of this paper is to present a detailed analysis of trawling vessels activities based on the automatic identification system (AIS) data combined with DNV GL ship register, data from HIS Maritime World Register of Ships and information gathered on the trawl equipment. In this aspect, an interactive web-based solution has been designed and developed to monitor and track trawl vessel activities in the Norwegian Continental Shelf which can be used for assessing integrity of pipelines. Data Analysis and visualization techniques have been utilized to transfer high-dimensional data by encoding it as visual objects contained in graphical presentations. The extracted knowledge result in the density mapping, vessel tracking, computing crossing points of trawl vessel paths, computing a buffered polygon around the pipeline for the chosen threshold and cross-over statistics of pipeline and vessels, etc. The use of such a framework is mostly advantageous for the port authorities, marine transportation, relevant fisheries management authority, etc.
Evaluation of ballast failures during operations of semi-submersible rigs
Authors: Unegbu N , Gudmestad O T 
Published: November 2019

Abstract
Risk analysis/assessment is one of the challenges encountered during operations of offshore units on the Norwegian Continental Shelf (NCS). In recent years, the Petroleum Safety Authority (PSA) has focused on hazards relating to floating installations and thus requested that more attention should be made by the industry on hazards relating to buoyancy loss and stability. Ballast systems play a very vital role to ensure vessel stability. Various failure modes of semi-submersible ballast systems are identified and possible barriers and consequences due to the ballast system failure during drilling operation are considered. The failure mode effect and criticality analysis (FMECA) of the main components of the semi-submersible’s ballast system is adopted to determine the failure causes and failure modes that could influence each components performance, and thus identifying the most critical component(s). The Structured What-If Technique (SWIFT) is used to compensate for hazard identification for the unidentified hazards (i.e., human errors), in the FMECA. By studying the most critical system components, a qualitative risk analysis is conducted to model accidental sequences by using the fault tree method to establish the chain of failure events. The result of the Structured What If Analysis (SWIFT) shows that maloperation of the ballast system is the main contributing failure cause. This involves, failure to properly describe ballast procedure, failure to follow ballast plan, wrong sequence of closing/opening valve, maloperation of valve, time pressure complacency, communication gap or general lack of knowledge of the system. The FMECA findings indicate that failure of valves to “close on demand” with a Risk Priority Number (RPN) of 60, is the most critical.