bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of Media Three-dimensional (3D) Visualization using Virtual Reality on Chemistry Education
Authors: Suleman M , Sugiyarto K H , Ikhsan J 
Published: December 2019

Abstract
This study aims to develop and test feasibility three-dimensional (3D) visualization of media using virtual reality in chemistry learning . The development model used in this study is Research and Development (R&D) model. This study implemented the stages of planning, preliminary development of the product, preliminary field testing, main product revision adapted from Borg and Gall. The development of the learning media in this study was validated by media expert, material expert, peer reviewers, and subject teachers, and was tested to 23 students. The results of this study revealed that three-dimensional (3D) media using virtual reality is feasible to use as learning media for high school students. The percentages of validation results are 74% by media and material experts, 76% by chemistry teachers, 84% by peer reviewers, and 77% by students. Overall, the average total percentage score of feasibility of the three-dimensional media is 78% categorized to ‘good’. In conclusion, the developed three-dimensional (3D) learning media using virtual reality is feasible to use in the chemistry learning process for the material of reaction rate.
Molecular Identification of Several Orchid Species Based on OPA10 and OPA18 RAPD Marker
Authors: Kurniawati Junita , Sugiyarto Lili , Yulianti Evy , Nurcahyo Heru , Mercuriani Ixora S. 
Published: December 2019

AbstractThe purpose of this study was to determine the genetic characteristics of nine orchids plants collected by Biology Gardens of Mathematics and Science Faculty of UNY based on OPA10 and OPA18 markers, to detect their genetic relationship, and determining the exact RAPD markers for identification of intraspecies and interspecies orchids. The analysis was carried out by isolating DNA from the leaves of 9 species of orchids (Rhynchostylis retusa, Vanda tricolor, Dendrobium aphyllum, Dendrobium fimbriatum, Dendrobium moschatum, Dendrobium crumenatum, Dendrobium antennatum, Dendrobium anosmumGigantea Alba andDendrobium anosmumGigantea) using TIANGEN DNA healing plant kit. Molecular identification was analysed based on the PCR-RAPD technique using OPA 10 and OPA18 primers. Electrophoregraph of PCR results are converted into binary data and analysed with NTSYSpc 2.02 software. The similarity index (kinship level) was analysed based on UPGMA dendrogram. The results of the analysis showed that there was genetic diversity in 9 orchid plants tested. Intra-species orchids show higher similarity than inter-species. Primer OPA 10, OPA18, and a combination of both shows polymorphism in intra-species orchids.
Comparison of Real Object and Blended Learning towards Students’ Metacognitive Knowledge
Authors: Musyaddad A. , Suyanto S. 
Published: December 2019

AbstractThis study aims to compare the effectiveness of real object-based learning and blended learning towards students’ metacognitive knowledge in ecosystem material. This research is a quasi-experiment using a pretest-posttest comparison group design. The population of this study was all students of class X in Bantul Public High School 1 and Bantul Public High School 2. The sample of this study was class X MIA 3 students as experimental group 1 and class X MIA 6 students as experimental group 2 in Bantul Public High School 1 and class X MIA 4 students as experimental group 1 and class X students MIA 6 as experimental group 2 in Bantul Public High School 2 which is determined through cluster random sampling. Data collection techniques in this study used tests and questionnaires. The research data analysis technique uses One Way ANOVA tests to determine the effect of real objects and blended learning on students’ metacognitive knowledge. The results showed that the two learning methods did not have a significant effect on students’ metacognitive knowledge, but blended learning had a higher average increase in metacognitive knowledge than real object-based learning.
Developing A Learning Continuum on Ecological Aspect from Elementary to Senior High School Based on The Opinions of Biology Education Experts
Authors: Mendala  , Subali B. , Paidi  
Published: December 2019

Abstract
This research uses survey method aiming to investigate the opinions of biology education experts toward the teaching and the assessment of ecological aspects previewed from the level of competency and characteristic of specific pedagogical materials in order to develop the learning continuum of ecological aspects from elementary to senior high schools was conducted in 2018-2019. The population used in this research was hypothetical population which consisted of the all experts of biology education who taught in public and private universities in Indonesia. The sample used in this research was convenience sample consisted of 85 experts of biology education who taught at 18 public and private universities in Yogyakarta, Central Java, East Java, West Java, and Jakarta determined by using purposive technique. The instrument used was confirmatory assessment questionnaire learning continuum based on mastery of ecological aspects which has been arranged by Subali et al. (2016) and the validty was well examined through the focus group discussion activity by 3 lecturers of UNY and 5 lecturers of UNS. The result of this research showed that learning continuum of ecological aspects according to the biology education experts’ opinion, start be taught and assessed in the fourth and fifth grade of elementary school with the competency level C1 and C2. Then, it will be continued to the higher level in seventh grade of junior high school with the competency level C2 and tenth grade of senior high school with the competency level C3.
Teacher’s TPACK Profile: The Affect of Teacher Qualification and Teaching Experience
Authors: Antony M. K. , Paidi  , Subali B. , Pradana S. P. , Hapsari N. , Astuti F. E. C. 
Published: December 2019

Abstract
The 21st century is the era of technology and digital. The 21st century affects all aspects of life, regardless education. This is clearly the teacher must improve their ability to master ICT in learning. The aim of this study was to determine the affect of teacher qualifications and teaching experience on biology teacher’s TPACK in the Magelang City. This was a survey research. The data collection technique uses TPACK test instruments from Paidi & Subali (2018). This research was conducted in all public secondary schools in the Magelang City, Central Java. Population in this study was hypothetico population. The sample in this study were 14 high school biology teachers in Magelag City. The analysis of data was two-way ANOVA, with provisions p <0.05, which means that there is a significant variable influence on TPACK implementation. This finding reveals that teacher qualifications and teacher teaching experience have Sig. score p <0.05. In conclusion, there was a significant affect of teacher qualifications and teaching experience on biology teacher’ TPACK.
Power law fluid model on wave mitigation, 2D simulation using smoothed particle hydrodynamics
Authors: Iryanto  , Bunga M S , Mustamiin M , Magdalena I , Erwina N 
Published: December 2019

Abstract
This article is focused on numerical modelling to describe influence of coastal vegetation in wave mitigation. The model based on Navier-Stokes equations with stress tensor written in power law model. Numerical approach used to solve the problem is SPH (Smoothed Particle Hydrodynamics). Three numerical simulation are conducted; plane Couette-Poiseuille flow, wave mitigation on flat bottom, and wave mitigation on incline bottom. The first simulation shows that our numerical results are in good agreement with analytic solution provided in [13]. The second simulation shows that existence of the coastal vegetation reduce the wave amplitude. Whereas the last simulation shows that the vegetation reduce the run up height. Further, the power law constant influences how high the run up.
What Difficulties that Students Working in Mathematical Reasoning Questions?
Authors: Zaini A H , Retnawati H 
Published: December 2019

Abstract
Reasoning skill plays an important role in developing all other mathematical skills. However, the results of subhan’s research (2017) inform that students are still weak and have difficulty in solving mathematical reasoning questions. Therefore, a study to analyze students’ difficulties in solving reasoning questions should be conducted to overcome this problem. Participants in the study were 15 of the 25 public high school students in Bantul district of Yogyakarta who had completed mathematical reasoning questions. They were deliberately chosen because when they completed mathematical reasoning questions from 25 students only 15 students completed mathematical reasoning questions in their entirety. The instruments of mathematical reasoning are as many as five questions in the class XI line material that has been tested for quality.The analysis was performed using types of difficulties adapted from procedure Newman which includes (1) reading, (2) comprehension, (3) transformation, (4) process skill, and (5) encoding. The results of the study indicate to encoding difficulties of 37.93%, comprehension difficulties of 24.14%, transformation difficulties of 19.54%, and process skill difficulties of 18.39%.
Why are mathematics teachers advised to use blended learning in the learning process?
Authors: Nuri Bulan 
Published: December 2019

Abstract
The success of mathematics learning is strongly influenced by the initiative and strong ability of educators to implement the learning that supports the achievement of the goals of mathematics learning. An effort to help provide an overview to the teacher to find a solution in choosing a learning model that can be applied in mathematics learning, this research was conducted. Focusing on the results of implementing blended learning in all possible learning programs with varying levels of education, 11 relevant articles were obtained to answer the formulation of this problem. The results obtained that the use of blended learning is very possible in mathematics learning. This is based on the results of research relating to the implementation of blended learning which has the potential to improve learning outcomes, activity, interest, motivation, understanding and even provides space for communication skills, teamwork, independence, and student achievement.
The Types and Factors of Error of Elementary School Students in Solving Mathematical Word Problems: An Analysis Using the Fong’s Method
Authors: Ramdhani Putri Hikmah , Bondan Widjajanti Djamilah 
Published: December 2019

AbstractThis research aims to identify types of error and factors that cause 6th-grade elementary school students in rural and urban areas to make errors in solving mathematical word problems based on Fong’s Schematic Model for Error Analysis. This research is a survey with a quantitative approach. The research population is all of the 6th-grade elementary school students in Kebumen, Jawa Tengah, Indonesia, totaling 1.928 students. The sample was 522 students consisting of 316 students from urban areas and 206 students from rural areas. The instrument of data collection is an essay test in mathematical word problems form. The instrument is declared valid by the content and construct validity. The instrument reliability coefficient is 0.83. The results of the study show that 6th-grade elementary school students in the urban area make errors incomplete schema with errors (E5) category while rural area students make errors in the category of irrelevant procedures (E2) and complete schemes with errors (E5). Furthermore, the cause of 6th-grade elementary school students in urban areas to make mistakes is a language factor, while in rural areas students make language and operational factors simultaneously.
Why is Mathematical Representation Difficult for Students?
Authors: Saifiyah S , Retnawati H 
Published: December 2019

Abstract
Mathematical representation is one of the mathematical skills that can help students present mathematical problems in various forms. However, students often face difficulties in doing so. This study aims to investigate the causes of difficulties faced by students in solving mathematical representation questions on trigonometry of the 10th grade. This is a qualitative case study. Data were collected both by documentation of research results in the form of 6 essay questions on mathematical representation and by interviews. The research participants were 10 high school students in the 10th grade of science program in Cirebon Regency, West Java, Indonesia. Through this case study, found the causes of difficulties experienced by students in solving mathematical representationquestions. Most difficulties (10 students) occurbecause students cannot represent mathematical expressions/symbol to solve questions in the form of images. On the other hand, the least difficulties (6 students) occurbecausestudents cannot using image representation to solve written text questions.
Improving Students’ Mathematical Literacy Skills Through Multiple Intelligences Approach in Problem Based Learning
Authors: Arrum Putri Dini , Bondan Widjajanti Djamilah 
Published: December 2019

Abstract
This literature study was focused on Multiple Intelligences approach in Problem Based Learning to improve Students’ Mathematical Literacy Skills. There are some relevant researches to describe Multiple Intelligence approach in Problem Based Learning and improve mathematical literacy skills. Now, the implementation of mathematics education should emphasize how the concepts learned by students can be applied in the real life context. This means that students are expected to not only able to solve problems at school, but also the problems outside of school. This ability is called mathematical literacy skills. The implementation of Problem-Based Learning methods can be applied by teachers to be able to improve students’ mathematical literacy skills. Problem-Based Learning is a student-centered learning method in which students actively participate in discussion groups where they discuss problem solving strategies. However, not every student is logically intelligent. Therefore, the implementation of Problem Based Learning must be combined with multiple intelligence approaches that can enhance each type of students’ intelligence.
Body posture and biomechanics in women after mastectomy
Authors: Lopera-Muñeton C , Valencia-Legarda F , Bedoya-Bedoya O M , Correa-Castaño D , Páramo-Velásquez C A 
Published: December 2019

Abstract
Breast cancer is the most frequently diagnosed cancer among women. Breast cancer has shown survivorship rate improvements due to technology, early diagnosis and better treatments than before. As breast cancer survivors are living longer, there has been greater focus on understanding the side treatment effects. Women following mastectomy displayed several postural and biomechanical alterations. The major problem in women after mastectomy, besides upper limb dysfunction, are disorders in the trunk area, specially the thoracic kyphosis, which has an influence on the formation of functional disorders in the median part of the spine. The current research describes the postural and biomechanical alterations after mastectomy in breast cancer patients and review the evidence regarding the possible effect of external prosthesis in corporal biomechanics and functionality. Results showed a tendency of muscle imbalance and shoulder and neck asymmetry.
Serious game for real-time brain-computer interface training
Authors: Vega I M , Adarve C A , Villar-Vega H F , Páramo C A 
Published: December 2019

Abstract
This article presents the development of the serious game PROEZA, for training users of a brain-computer interface system for control a hand prosthesis. The document describes the integration of electroencephalogram signals captured by an Emotiv Epoc+ headband, with the Unity video game engine. Also, it is presented how control commands are generated for the video game and for a handheld prosthetic device from these signals, basis of brain-computer interface systems. In addition, a protocol for validate the skills of the users to control the signals of the brain-computer interface system is proposed, based on evaluations before and after to training in PROEZA. The experimental results, after tests carried out on 2 users, show that the proposed protocol promises to be an appropriate strategy to evaluate the ability of users to control the brain-computer interface system and opens up the possibility to develop multiple physical and neuro rehabilitation applications using of serious games.
Design of a vegetable production model: Z-farming
Authors: López A , Aguilar M , Vélez J S , Pineda E F , Ordoñez G A 
Published: December 2019

AbstractCurrently, climate change is a limiting factor in agriculture, due to the changes in periods and intensity of rainfall, extreme temperatures which generate economic losses and shortages of food. In addition to this factor, population growth and migration to the cities establish the need to seek strategies to guarantee food security and sovereignty, through the so-called urban gardens. From this concept comes a new and visionary subtype of agriculture called Z-farming, which includes the production of food in vertical environments, without using soil and available in open spaces close to cities or completely closed. The “Semillero de Investigación en Tecnología Electrónica Aplicada, Centro de Biotecnología Industrial, Servicio Nacional de Aprendizaje, Palmira”, developed an automated system design for plant production, which aims to raise awareness about food production in small spaces, in order to provide a tool for food production. The design includes the improvement of product characteristics with emphasis on shape, function, and use, with a priority focus on the end user. The project aims to develop a prototype of an automated plant production system as a strategy for innovation and research in sustainable agriculture.
Implementation of a technological, information, and communication tool for project management in the network of Tecnoparque, Colombia
Authors: Castro-Maldonado J J , Londoño-Gallego J A , Londoño-Marin S , Patiño-Murillo J A 
Published: December 2019

Abstract
In Colombia, the development of technology-based projects is being promoted and encouraged. In this sense, different institutions, both private and governmental, allocate a large amount of technical and financial resources to develop or contribute to the development of such initiatives. However, in entities such as the “Red de Tecnoparque Colombia del Servicio Nacional de Aprendizaje”, strategies that allow managing and evidencing the activities developed by each of the projects carried out in the network had not been implemented. Therefore, no information support allowed to measure or sustain the technological maturity of the projects gestated. Thus, in “Tecnoparque Nodo Medellín”, a software platform was developed to register and manage the entire development path of technological projects. Also, the platform provides management indicators and a repository of evidence to use at the national level, allowing monetization of the activities of support in Investigation and development of the “Red Tecnoparque” in Colombia.
Management context of entrepreneurship in engineers and architects in Tachira, Venezuela
Authors: Garmendia Mora J C , Barrientos Monsalve E J , Castro Maldonado J J 
Published: December 2019

Abstract
This article arises from the research in which one of its objectives was to characterize the entrepreneurs of the small and medium industries of Tachira, Venezuela in terms of their managerial competencies, developed under the qualitative approach, having these entrepreneurs as key informants. The interview and field notes were used as techniques for data collection. Today the entrepreneurs of the construction sector are mostly engineers and architects, graduates of universities in the region, who have the technical skills related to the core of the business, but have shortcomings in other managerial and entrepreneurial skills, so we propose a change in the curriculum study that includes as a longitudinal axis of engineering careers, subjects that allow the internalization of various managerial skills that increase the likelihood of success in future companies.
Development of a generalized proportional integral control strategy for level control in a coupled tank system
Authors: Regino-Ubarnes F J , Gómez-Camperos J A , Ruedas-Rodriguez A F 
Published: December 2019

Abstract
This work presents the analysis and design of a generalized proportional integral control strategy for a level control in a coupled tank system, such analysis is made under the active disturbance rejection. The principle objective is to show the advantages of the control strategy generalized proportional integral as to signals tracking and disturbance rejection, compared to conventional control techniques such as the proportional integral derivative control. To validate the process, the modeling of the system was carried out and with this model simulations were carried out under nominal conditions, applying the two control strategies. It was found that the generalized proportional integral control presented a better performance since it achieves a lower mean squared error percentage than the proportional integral derivative control, even in the presence of disturbances.
Control design using state observation and model reference adaptive systems for a dc motor
Authors: Florian-Villa A E , Patiño-Murillo J A 
Published: December 2019

Abstract
This paper proposes an adaptive control structure involving the integration of a Luenberger observer with a model reference adaptive system. The Luenberger state observation algorithm describes a dynamic system that estimates the state vector of a system under observation. Model reference adaptive system is a technique providing an automatic adjustment of a controller in real-time. The integrated control structure was implemented in the simulation of a first-order system that describes the dynamics of a direct-current motor. The results obtained show the performance improvement to other classic control techniques for these direct-current systems. Simulation results also demonstrate the acceptable performance achieved by the proposed control for systems involving variables without direct measurement. For these cases, it is mandatory to have a good observation of the unmeasured variable and a suitable control structure developed for the overall process.
Manufacture of cellulose acetate membranes and chitosan nanoparticles for the retention of mercury in water
Authors: Castaño Ramirez M , Gutierrez Jimenez D , Palacio Valderrama J C 
Published: December 2019

Abstract
In Colombia, an average of 75 tons of mercury is released annually due to the illegal mining activity of gold, causing natural water sources to be contaminated in regions that collect water through rivers and streams, generating mercury poisoning. Nanochitosan, a biopolymer synthesized at the nanoscale, has shown its ability to retain different heavy metals in wastewater due to its greater availability of amino groups at its surface. In this work, a set of preliminary parameters were identified and established for the development of cellulose acetate membranes with chitosan nanoparticles for mercury retention. Nanoparticles were synthesized by ionic gelation, varying the addition rate of sodium tripolyphosphate. The membranes were prepared by solvent exchange, varying the concentration of polyethylene glycol, the pore-forming agent. Finally, the samples were characterized by scanning electron microscopy and dynamic light scattering. The results showed that there is a proportional relationship between the rate of addition and the size of the particles obtained, while, for the membranes, 11% polyethylene glycol produced a porous network with cellulose acetate fibers inside the pores.