bluuebunny/crossref_metadata_2025_split huggingface dataset:
V International Conference Days of Applied Mathematics
Authors: Sandoval-Amador A , Acosta A Pimienta , V-Niño E D 
Published: December 2019

This proceeding presents the written contributions of the participants of the V International Conference Days of Applied Mathematics (V ICDAM), which was held from 15 to 17 May 2019, at the Barranquilla, Colombia, and was organized by the “Facultad de Ciencias Basicas y Biomedicas” of the Universidad Simon Bolivar.
The purpose of the V ICDAM was to share experiences of mathematical knowledge for solving situations/problems seen from different contexts. The topics developed in this conference was: (i) Mathematical Didactics (MD), (ii) Mathematical Modelling (MM), (iii) Scientific Computing (SC), and (iv) Multidisciplinary Science (MS)
Within the framework of this conference, the Olympic of University Applied Mathematics and the Olympic of High School Applied Mathematics were held. With these latest activities, the idea is to mitigate the gap between high school and higher education in the region, inviting students of the 11th grade and the math teachers from schools and institutions of higher education located in the metropolitan area of Barranquilla.
List of Organizing Committee, National Scienctific Committee and International Scienctific Committee are available in this pdf.
Importance of coupling the teaching methodologies of mathematics with the learning styles of digital natives
Authors: Guzmán M Orozco , Castro S Obredor , Acuña F Mejía , Malo E Silvera 
Published: December 2019

AbstractThe purpose of this article is to explain the importance of adapting the teaching and learning methods of mathematics through the use of ICTs. It is suggested that it is necessary to do so, because at present, we are in the knowledge and information society. For this, we use the literature review as an investigative method, with which we hope to explain the disadvantages of continuing to use traditional methods and the importance of innovating it through reflective practices and collaborative projects. Then, we will address the skills that need to be developed, to adapt students to the demands of today‘s societies. Similarly, we will explain the characteristics of modern students through the concept of digital natives, to identify what tools and methods can be used in order to facilitate meaningful learning of mathematics. Finally, we will be offering a discussion about the method that should be implemented and what studies exist to support its use. It is concluded that the Tics must be included in the teaching of mathematics because they are necessary to adjust to work and professional life.
Geocatatum: Its influence on the development of children‘s geometric thinking
Authors: Ovalle E López , Ortega M Vergel , Colmenares C A Gómez 
Published: December 2019

Abstract
The objective of this article is to analyse the influence of the implementation of the Geocatatum platform, a didactic tool in the teaching of geometry in early childhood education. The research follows a mixed study, quasi-experimental and phenomenological design; the sample conformed of 250 children from educational institutions in the Catatumbo, Norte de Santander, Colombia. Resources and services for students and teachers are announced in the development. The results show that the virtual resources and services designed and implemented improved academic performance in geometry and the development of geometric thinking. Emerging categories to these factors were promotion of practices of application of geometry in context, effective use of tic and communicative skills.
Technology and mathematics as a cognitive component
Authors: Mendoza D , Nieto-Sánchez Z C , Vergel-Ortega M 
Published: December 2019

Abstract
The objective of the study was to analyze the technological impact and cognitive attributes of technology for the construction of meaningful learning of mathematics students at Universities in Ecuador and Colombia. The sample was non-probability, with the participation of 1124 students. A mixed study of sequential explanatory design was applied. In the quantitative phase, correlational method, were applying a digital questionnaire, the data were analyzed through multiple regression and statistical analysis of nested variance to two variables demonstrating the need to implement mathematical software. In the qualitative phase, the mathematical software Wiris and Geogrebra were implemented and results merged by the contrasting method. The conclusions demonstrate the impact of digital connectivity, distinguishing technology as a cognitive component through dynamic knowledge. The method was effective to the development of logical analytic thinking; boosted the activity of the right limbic lobe.
Landscape sustainability analysis: Methodological approach from dynamical systems
Authors: Redondo J M , Bustamante-Zamudio C , Amador-Moncada J , Hernandez-Manrique O L 
Published: December 2019

Abstract
Sustainable development is a concept that has been maturing since its promulgation in Brundtland in 1987. Following a complex systems-based reflection that involves system dynamics, dynamical systems and viability theory, is proposed that sustainability is an emerging expression of the landscape, whose emergence results from the socio-ecological interactions of the landscape, so its analysis must be of a type systemic, incorporating the temporal transformation of all landscapes aspects, and not only portions of them, in addition, in this paper is explained that sustainability does not exist as a single state, but that there are sustainabilities and that, although its analysis is specific space, it should allow comparison with higher and lower spatial scales. In this way, a methodological approach is made from dynamical systems theory for sustainability landscape analysis. This perspective not only allows to recognize the trend behavior of a socio-ecological system in the landscape establishing its sustainability, but it is also oriented to decision-making, so, the management of sustainability indicators should not be done as if in the landscape were disconnected, causing possible deterioration of other indicators during the management, but through sustainability principles defined as indicators set satisfying constraints. In this way, the perspective from the dynamical systems theory allows the recognition of sustainability and guides on the decision making in the landscape.
Some tastings in Morales-Ramis theory
Authors: Acosta-Humánez P , Jiménez G 
Published: December 2019

Abstract
In this paper we present a short material concerning to some results in Morales-Ramis theory, which relates two different notions of integrability: Integrability of Hamiltonian systems through Liouville Arnold theorem and integrability of linear differential equations through differential Galois theory. As contribution, we obtain the abelian differential Galois group of the variational equation related to a bi-parametric Hamiltonian system.
Renal lithiasis detection in uro-computed tomography using a non-parametric technique
Authors: Rodríguez-Ibáñez R , Vera M I , Vera M , Gelvez-Almeida E , Huérfano Y , Valbuena O , Salazar-Torres J 
Published: December 2019

Abstract
Renal lithiasis is the pathology that causes nephritic colic, which is one of the most frequent reasons for consultation in emergency medical services. According to the size, location, hardness and number of stones present in the urinary system, usually in the human kidney, it is established to which form of treatment is suitable for the patient. These kidney stones can be analyzed by means of biopsy or imaging modalities such as computed tomography images. This type of images has challenging problems called noise, artifacts and low contrast. In this paper, in order to address these problems, a non-parametric semi-automatic computational technique is developed for detecting kidney stones, present in computed tomography images, using digital image processing techniques based on a smoothing filter and an edge detector. Finally, the size and position of the stones present in the images are calculated and a precision metric is considered to compare the manual segmentation, performed by an urologist, and the one generated by the NPCT, obtaining an excellent correlation. This technique can be useful in the renal lithiasis detection and if it is considering this kind of computational strategy, medical specialists can establish the clinic or surgical actions oriented to address this pathology.
Volumetric quantification in ovarian pathology using abdomino-pelvic computed tomography
Authors: Valbuena O , Vera M I , Vera M , Gelvez-Almeida E , Huérfano Y , Borrero M , Salazar-Torres J , Salazar W 
Published: December 2019

Abstract
Pathological ovary is categorized into cystic tumors, solid tumors and mixed, according to the content of the affected ovary. Accordingly, the degree of benignity or malignity thereof is established. The imaging study for the preliminary morphological assessment of PO is ultrasound, in its pelvic and transvaginal modalities, for which well-established criteria are available. Once the ultrasound findings suggest malignancy, complementary studies such as abdominal-pelvic tomography images and tumor markers are requested. This type of images has challenging problems called noise, artifacts and low contrast. In this paper, in order to address these problems, a computational technique is proposed to characterize a pathological ovary. To do this, a thresholding and the median and gradient magnitude filters are applied, preliminarily, to complete the preprocessing stage. Then, during the segmentation, the algorithm of region growing is used to extract the three-dimensional morphology of the pathological ovary. Using this morphology, the volume of the pathological ovary is calculated and it allows selecting the surgical-medical behavior to approach this kind of ovary. The validation of the proposed technique indicates that the results are promising. This technique can be useful in the detection and monitoring the diseases linked to pathological ovary.
Association between breath methane concentration and visceral fat area: a population-based cross-sectional study
Authors: Ozato Naoki , Saito Shinichiro , Yamaguchi Tohru , Katashima Mitsuhiro , Tokuda Itoyo , Sawada Kaori , Katsuragi Yoshihisa , Kakuta Masanori , Imoto Seiya , Ihara Kazushige , Nakaji Shigeyuki 
Published: December 2019

Abstract
High visceral fat area (VFA) is a stronger predictor of cardiovascular disease and overall mortality, compared with body mass index (BMI) and waist circumference (WC). Recent reports demonstrate that obesity is related to breath gas, which is produced by the intestinal microflora. However, these studies define obesity using BMI, not VFA. In this population-based cross-sectional study, we investigated the relationship between breath gases (methane and hydrogen) and both VFA and BMI. A total of 1033 participants (62% women; age [mean ± standard deviation] 54.4 ± 14.9 years) in the 2015 Iwaki Health Promotion Project in Japan were enrolled in the study. Breath samples were collected using a breath bag and analyzed by gas chromatography. VFA was measured using a visceral fat meter. The proportion of methanogenic bacteria to total intestinal microbiota was measured by polymerase chain reaction and 16S rRNA gene sequencing analysis. Our analysis revealed a significant association between high VFA and low breath methane, even after adjusting for confounding factors (B = −0.024 and P = 0.004). To identify the association between breath methane and VFA in participants with methane-producing bacteria in their intestinal microflora, participants were divided into two groups based on the presence or absence of methanogenic bacteria in their stool. The Methanogen + group was further divided into two subgroups with breath methane higher (Methane-UP) or lower (Methane-LO) than the median breath methane concentration. VFA was significantly lower in the Methane-UP group than in the Methane-LO group. In participants with methanogenic bacteria, breath methane concentration might be an independent biomarker of visceral fat accumulation.
Research on radiation noise field reconstruction of underwater vehicle shell structure
Authors: Xu He , Kong Deyi , Qian Yujie 
Published: December 2019

Abstract
When studying the radiation noise of underwater vehicle, it is more realistic to simulate the underwater vehicle by using the volume source shell structure model. However, in the process of using COMSOL to simulate the radiation noise of the underwater vehicle shell structure, the far field calculation cannot be realized with the software because the calculation amount is too large. This paper proposes to measure the noise of underwater vehicle shell structure model in the near field. According to the theory of acoustic holographic and the idea of equivalent source, it is achievable to obtain the equivalent sound source of underwater vehicle shell structure noise source, and thus realizing sound field reconstruction. Studies have shown that underwater vehicle radiation noise field reconstruction and far-field calculation can be achieved by transformation within the tolerance of error. At the same time, this paper also compares the reconstructed sound fields obtained by different methods.
Study on compatibility of hydroxypropyl guar gum/ultrafine powder of bagasse blends
Authors: Huang Xiaobing , Chang Gang , Wei Xiaoyi , Wang Fei , Cui Lihong , Fu Tiaokun , Xia Wen 
Published: December 2019

Abstract
The influence of the concentration of bagasse ultrafine powder on the compatibility of hydroxypropyl guar gum solution/bagasse ultrafine powder blend system was investigated by Hakke MARSIII rheometer from Germany. According to Utraki principle, composite viscosity, storage modulus and loss modulus analysis, cole-cole curve and other theories, the stable and dynamic scanning data of the blends were processed and analyzed. It was found that when hydroxypropyl guar gum/bagasse ultrafine powder =40/100 (m/m), the compatibility between the two was good. SEM also confirmed this conclusion.
Study the critical value of outburst effect inspection index in the case of regional gas predrainage
Authors: Wang Song 
Published: December 2019

Abstract
China is one of the nations that have grievous coal and gas outburst problems, gas outburst prediction is the key technology of gas prevention and treatment, the critical value of gas outburst prediction index in relation to coal mine production safety and the economy. In order to study the evaluation index of the regional drainaged NO.3 coal seam in Sihe mine, based on the gas outburst integrative theory, proposes gas content under the corresponding beginning outburst gas pressure is treated as evaluation index critical value. Raw coal samples were taken on site and sealed, and their residual gas content and residual gas pressure were determined after adsorption equilibrium. By this method, the law of residual gas content and residual gas pressure of raw coal under the influence of original moisture is studied, and the corresponding gas content under initial gas outburst pressure is obtained, and the critical gas content value of 10m3/t is verified on the spot.
Experimental research and application of tunnel transient electromagnetic leading detection remove noise method
Authors: Lv Guoren , Ge Jiandong , Zhang Lewen 
Published: December 2019

Abstract
In the construction process of underground space engineering such as tunnels, it often faces geological disasters such as water inrush and mud inrush. The transient electromagnetic method is based on the difference in electrical resistivity between surrounding rock and water-bearing structure, and can detect and locate the water-bearing structure in front of the tunnel face. However, due to the interference in the tunnel environment, the quality of the late data in the actual detection process is relatively poor and generally cannot be used. In this paper, uniform half-space model and three-layer classical model are designed to study the applicability of converting induced electromotive force detected by transient electromagnetic method into apparent resistivity. It is found that the late data conversion effect is good when there is no interference, and the late data conversion effect is poor in the case of strong interference. Using these two models, three filtering algorithms are compared respectively to improve the quality of late data, improve the detection depth of transient electromagnetic method. Through field experiments, after comparing the filtering algorithm with the traditional direct truncation method, it is found that the late data can be used, which effectively improves the depth of detection, and the early data imaging results are the same as the direct truncation mode imaging results, the filtering algorithm does not affect the early data.
Research on the settlement of deep water submerged dike structure
Authors: Liu Wenbin , Zhao Yan 
Published: December 2019

Abstract
The 12.5 m deep-water channel from Nanjing to mouth in the Yangtze River is a national key channel. This paper analyzed the settlement feature of deep water submerged dike structure in He changzhou waterway section based on in-site tests. The settlement was recorded and a fitting function to predict the long-term settlement was proposed.
Calibration and Error Analysis of Mine Dust Monitoring System
Authors: Yang Zhang , Jingcan Shi , Changlong Jiang , Shoufeng Tang , Minming Tong 
Published: December 2019

Abstract
Since most of China’s coal mines have not taken effective measures to prevent dust and dust, the harm of dust to the human body has been in a high situation. At present, there are still some problems in the reliability and detection accuracy of most dust monitoring systems. In this paper, a large number of simulation experiments have been carried out, and the test data have been used to verify the results. The reliability and measurement accuracy of the dust monitoring system are verified from the calibration and repeatability of the monitoring system. At the same time, the error sources that affect the accuracy of the monitoring system are analyzed and the solutions are proposed. The system is improved in the subsequent experiments, which improves the accuracy and reliability of the system measurement.
Valuation of Urban Water Eco-System Service Functions
Authors: Zhang Lijia , Huo Peng , Zhang Yang 
Published: December 2019

Abstract
Water eco-system service functions refer to the natural environment conditions and utilities formed by the water eco-system and ecological process to maintain human survival. They are the eco-environmental conditions for human survival and development and the basic resources of human social and economic development. During the rapid development of the urbanization process, the urban water eco-system has been increasingly influenced by human activities. Humans have severely destroyed the original urban water system while exploiting and utilizing water resources on a large scale, and consequently resulted in a series of water environment problems. In order to build a harmonious urban eco-system and reasonably utilize and protect water resources, it is of great importance to analyse and improve the urban water eco-system service functions and conduct the valuation, so as to arouse the public’s awareness of recognizing and protecting the urban water resources.
Research Progress of Biochar in Memediation of Contaminated Soil
Authors: Shuang Cui , Xumeng Cui , Qikai Zhang , Jianhui Song , Changjia Jiang 
Published: December 2019

Abstract
Biochar is a carbon-rich material produced by pyrolysis and carbonization of biomass raw materials (mainly agricultural wastes) under complete or partial hypoxia. Because of its excellent structural properties, it is often applied to contaminated soil as a remediation agent and soil amendment agent. In recent years, biochar has attracted widespread attention in environmental remediation, and has become a research hotspot in current environmental science. This paper introduces the biochar treatment of soil pollution by introducing the concept, preparation method and physicochemical properties of biochar. The research progress of biochar in the treatment of heavy metal contaminated soil in recent years was reviewed. The effect of biochar on the bioavailability of heavy metals in soil was discussed. However, there are still some shortcomings in current research and remediation methods. It is expected to find environmentally friendly, scientific and reasonable materials and technologies to repair soil pollution.
Research progress on wastewater treatment methods and technologies in paper industry
Authors: Lin Yi , Lin Hua , Chen Kaiwei , Cai Tongbo , Liu Zhaojun , Wang Yian , Chhuond Kong 
Published: December 2019

Abstract
The pulp and paper industry has polluted a large amount of water, and it has the traits of high concentration and wide coverage, which can be said to be one of the most serious polluting sectors in China. With the rapid development of the paper industry, the treatment of its wastewater has also attracted the attention of many departments. The treatment of industrial wastes from the paper industry has always been concerned by researchers, and it has many treatment methods which has its own advantages and disadvantages. This paper discusses different common methods and combination techniques and their application in treatment of industrial wastes from the paper industry.
Design and Research of Wind Erosion in Sandy Land and Typical Sand Fixation Project in Small Watershed in Jiangxi Province
Authors: Zhan Lichao G , Meng Chen , Yuejun Song , Peilin G E , Minghao MO , Jian Duan 
Published: December 2019

Abstract
Due to the difference in climate, soil, region and geomorphology in north and south, there are certain characteristics in the design requirements of sand fixation project for a small watershed in Jiangxi Province in southern red soil region. It is quite different from that of northern China, so it should be designed according to the local condition of Jiangxi province. This paper enumerates the distribution, causes and characteristics of wind erosion in sandy land in Jiangxi Province. According to the principle of “advanced technology, reasonable economy, safety and reliability”, sandy land treatment and restoration technology of typical Vitex trifolia in Jiangxi Province are selected for description. Suitable sand fixation engineering design for Jiangxi Province with prolonged service life, high comprehensive benefit, low cost and simple construction technology is formed. It has important technical guiding significance for promoting the construction of ecological Poyang Lake Basin and national ecological civilization experimental area, improving the effectiveness of sand control measures, protecting “one lake of clean water” in Jiangxi Province.