bluuebunny/crossref_metadata_2025_split huggingface dataset:
Designing augmented reality-based teaching resource of three dimensional geometry
Authors: Mailizar  , Johar Rahmah , Lainufar  
Published: March 2020

Abstract
Indonesia, like many other countries, sees Information and Communication Technology (ICT) as a potential tool for enhancing education and the country is keen to integrate this digital technology in the classroom classrooms. Therefore, since 2004 Indonesian Ministry Education and Culture has stipulated a regulation on the implementing the technology in teaching and learning process. Furthermore, since 2013 Indonesian government implemented a new curriculum emphasizing the use of ICT in the classroom. Recently, Augmented Reality (AR) is one of digital technologies that has received increasing attention for teaching and learning of mathematics. However, lack of research has been devoted to design and develop Augmented Reality-Based teaching resources for secondary school mathematics. This study aimed at designing and developing Augmented Reality - based teaching resources (e.g., lesson plans, student worksheets and Augmented Reality Applets) for teaching Geometry in senior secondary schools. In order to achieve the aim, in this study, we employed a design research model proposed by Plomp and Nieveen. This model consists of three phases that are preliminary phase, prototyping phase and assessment phase. It is important to note that this paper reports results from preliminary. In the preliminary phase we distributed questionnaires to teachers and students which were then followed by interviews. The findings revealed that teachers and students were keen to integrate Augmented Reality technology in teaching and learning mathematics. Furthermore, the teachers expected to be equipped with ICT-based learning resources that support discovery and project based teaching approach. Based on the findings, we designed and developed Augmented Reality applet, lesson plan and student worksheet for teaching three dimensional geometry in senior secondary schools with a project based-teaching approach.
Development of learning instructions on mathematics learning based on M-APOS to improve problem-solving ability of grade VII students of middle school / MTs
Authors: Yerizon  , Armiati  , Fadhilah L , Afifah Rusyda N 
Published: March 2020

Abstract
This study discusses the development of mathematical learning instructions based on the M-APOS theory. It aims to produce a mathematical learning instruction based on the M-APOS theory for students on grade VII of SMP / MTs of the second semester which is valid, practical, and improve students’ mathematical problem-solving abilities. The type of research is research and development which develops lesson plans and worksheets. The Plomp model was used in this study consisted the preliminary analysis phase, the prototype development stage, and the assessment stage. In the preliminary stage, a needs analysis, curriculum analysis, concept analysis and analysis of students is carried out. At the prototype development stage, a formative evaluation was carried out consisting of self-evaluation, one-to-one evaluation, expert review, small group evaluation, and field test. The subjects of this study were VII grade students of SMP Negeri 2 Pasaman. Based on the field test, learning instructions, the RPP and LKPD based on M-APOS mathematics for class VII SMP in the second semester, are valid, practical and effective. Valid is from aspects of content, presentation, language, and graphics. Practical is the in terms of implementation, time, ease of use. And effective is in terms of its potential impact on students’ mathematical problem-solving abilities.
Students’ obstacles in understanding the properties of the closed sets in terms of the APOS theory
Authors: Herawaty Dewi , Widada Wahyu , Handayani Sri , Berindo  , Febrianti Rina , Anggoro Abdurrobbil F D 
Published: March 2020

Abstract
An understanding of the concepts and principles of open sets can be done through activities in the form of mathematical actions, processes, objects organized in a scheme. This was the operationalization of the APOS theory (Action, Processes, Objects, and Schema). The purpose of this study was to describe students’ mistakes in understanding the properties of open sets in terms of the APOS Theory. This research was part of development research. It was the stage need assessment stage. We want to determine the characteristics of students to determine the right learning model. The subject of this study were 15 students of mathematics education at the University of Bengkulu. Students were selected based on the tasks that they do in learning Real Analysis. Data was collected from paper and pencil results and task-based interview results. Data were analyzed qualitatively using fixed comparison techniques. The results of this study were that students can only coordinate two or more sets, and the difficulty of proving a set theorem closes. One such theorem was “F was a subset of R, F closed sets if and only if F contains all the cluster points”. He can only take actions separately from the characteristics of the set given. The conclusion of this study was the difficulty of students in understanding the properties of the closed sets was the inability of students to carry out interiorization from actions to processes. Also, it was not able to encapsulate processes into objects. He was unable to reach the scheme of the properties of closed sets.
The thinking process of students in understanding the concept of graphs during ethnomathematics learning
Authors: Widada Wahyu , Herawaty Dewi , Andriyani Dwi S , Marantika Renti , Yanti I D , Falaq Dwi Anggoro Abdurrobbil 
Published: March 2020

Abstract
Understanding of concepts was one of the goals of learning graph theory. The concept of graph can be achieved through learning ethnomathematics. The purpose of this study was to describe students’ thinking processes in understanding the concept of graphs during ethnomathematics learning. This research was part of development research. This was the prototype stage. The subjects of this study were 26 students in the University of Bengkulu. The instrument of this study was the researchers themselves plus interview guides, anecdotes and observation sheets. Data collection was done during ethnomathematics learning. Data were analyzed qualitatively with the constant comparative technique. The results of this study were students begin learning with a culture of communication using mobile phones. Students think about the definition of graph by corresponding to a cellphone with a vertex. The edge of a graph was corresponded to the existence of a relationship between mobile phones. Students can define graph as a system that was built by a set of non-empty vertices, and a set of edges which were pairs of non-sequential vertices. The conclusion of this study was that students’ thought processes in understanding the concept of graph through ethnomatematics approaches. It was a contextual problem about the culture of communication using mobile phones.
Crochet crafts as a context using LSLC in number pattern
Authors: Andini  , Putri R I I 
Published: March 2020

Abstract
The research aims to produce a learning trajectory that can help students understand of number pattern learning by using the context of crochet crafts in 8th grade students. This research was conducted at SMP Negeri 1 Palembang. This research method using design research. The stages of the research carried out consisted of preparation for the experiment, design experiments, and retrospective analysis. Data collection is done through question answers, interviews, video recordings, and photos. In this study, learning was designed and developed based on alleged learning, PMRI, and LSLC. The results of this study indicate that learning pattern numbers using the context of crochet crafts can help students understand numerical patterns and find equations that can be used to find patterns of numbers to n.
Students’ metacognitive skills in solving word problem
Authors: Widodo Yulianto Florensius 
Published: March 2020

Abstract
Problem solving is the primary purpose of the mathematics curriculum. Metacognitive skills play an important role in problem solving. Solving mathematics word problem is a part of the problem solving. Students need appropriate steps and strategies to solve word problems and, in many cases, each student uses different strategy in solving word problem. This is because the difference of mathematical ability. This study aimed to describe the profile of metacognitive skills of students with high math ability and low math ability in solving the mathematics word problem, from the aspects of metacognitive skills of planning, monitoring and evaluating. The type of this research is qualitative descriptive. Subjects of the study are two students of Senior High School in Yogyakarta. Data collection techniques are observation, test, documentation and interviews. The validity of the data using a triangulation method. Data analysis techniques of this research are data reduction, data display, and conclusion/verification. The results of the study show that students who have high mathematical abilities meet the indicators of metacognitive skills in the planning, monitoring and evaluating stages. While students who have low mathematical abilities meet indicators of metacognitive skills in the planning stage but, have not fully met the indicators of metacognitive skills in the monitoring and evaluating stages in solving problems.
Gerpak Tuyul as the context in learning addition integer using LSLC system
Authors: Agustina A , Putri R I I 
Published: March 2020

Abstract
The researcher aims to produce a learning trajectory that can help students understand the operation of adding integers using the game gerpak tuyul. The sample of this study was students of class VIII of SMP Negeri 1 Palembang. The research method used is design research (design research). this study was designed through integer material learning using the context of the game of gerpak tuyul. Data collection is done through video recordings, photos and interviews. The stages of this study consisted of experimental preparation, design experiments and retrospective analysis. This research was only conducted in stage 1, namely preliminary preparation. The results of this study indicate that the resulting learning trajectory can help students more easily understand the concept of integer addition operations.
Studies of level visual thinking in geometry
Authors: Anwar  , Juandi D 
Published: March 2020

Abstract
Learning mathematics is how students get information that is built capable of solving a problem. One way of thinking someone is by visual thinking. Visual thinking has an important role in the success of mathematics learning, especially in solving mathematical problems that require high-level reasoning, one of them in solving the problems of abstract geometry. Although to help students develop their ability to think visually or visualize, first the teacher must pay attention to the level of visual thinking of students. This paper aims to determine the level of visual thinking in geometry. Based on the results of the literature review the authors built three levels of visual thinking in geometry, level 0: Non-visual (NV), level 1: local visual (LV) and level 2: Global Visual (GV).
Students of the extended abstract in proving Lobachevsky’s parallel lines theorem
Authors: Widada Wahyu , Herawaty Dewi , Jumri Rahmat , Wulandari Hayatri , Aliza Fenny , Anggoro Abdurrobbil F D 
Published: March 2020

Abstract
The highest quality of the students in proving the theorem was extended abstract. One of the theorems that was difficult to determine was Lobachevsky’s parallel lines. The purpose of this study was to describe the characteristics of extended abstract level students in proving the Lobachevsky parallel lines theorem. This was part of research development. This stage was the student analysis phase. The subjects of this study were 21 Mathematics Education Pre-service teachers who were taking Geometry courses. The instrument of this study was the researchers themselves with the help of task sheets and interview guides. Data was collected through task-based interviews. Qualitative data analysis techniques with fixed comparison techniques. The results of this study were that students were able to understand the axiom “through a point outside the line g, there were at least two lines parallel to g”. This axiom was used to prove the Nonmetrical Theorem. Also, students were able to prove that through point T which was not located at line g, there were not so many lines parallel to g. Students were able to compare the deductive structure of Lobachevsky’s Geometry with Euclid’s Geometry. The conclusion of this study was that extended abstract students were able to present several elements and pass interdependence between one another, so that it becomes an integrated entity. He can generalize to new structures.
Colonic Carcinoma Diagnosis using Chitosan Nanoparticles Based on the Optical Properties.
Authors: Abuelmakarem Hala S. , Hamdy Omnia , Sliem Mahmoud A. , El-Azab Jala , Om-Hashem M.A. , Ahmed Wafaa A. 
Published: March 2020

Abstract
Medical diagnosis using optical techniques and contrast agents is a promising method where it is safe and unexpansive technique. Every tissue can be distinguished by its optical absorption and scattering properties that are related to many physiological changes and it is a sign for cancerous cells. Characterizing the light propagation in the human tissues is a vital issue in early cancer diagnosis for more effective therapeutic. In this work, the glowing effect of chitosan nanoparticles has been observed. Also, the light propagation in each of colon cancer (Caco-2 cell line) and normal cells (WI-38 cell line) at 650 nm and 808 nm in the absence and in the presence of chitosan nanoparticles was studied to study its effect in differentiate the cancer cells from the normal cells. Chitosan nanoparticles were characterized by the dynamic light scattering and transmission electronic Microscope (TEM). A Monte-Carlo simulation model was applied to obtain spatially resolved steady state diffuse reflectance measurements for each of the examined cells. Furthermore, the optical fluence rate distribution at the tissue surface were used to reconstruct the image using the diffuse equation using the finite element method. Chitosan nanoparticles appeared its glowing effect. The proposed diffuse reflectance curves and fluence rate images show different features regarding for each of Caco-2 cell line and WI-38 cell line that promises to be effective in medical diagnosis.
Laser-Induced Synthesis of Pure Zinc Oxide Nanoflakes
Authors: Sabry Raghda , Fikry Mohamed , Ahmed Ola S , Zekri Abdel Rahman N , Zedan Abdallah F 
Published: March 2020

Abstract
Nanostructured zinc oxide (ZnO) has received immense attention as a low-cost and non-toxic photo-active material for different applications such as photocatalysis, photovoltaics, photonic and bio-medical fields. Herein, facile crystalline ZnO nanoflakes were prepared by homogeneous precipitation followed by laser-induced recrystallization and without the use of any organic ligand. The effect of laser type and wavelength on the recrystallization process was studied adopting a pulsed nitrogen laser (λ=337 nm) and a continuous argon laser (λ=488 nm). The pulsed nitrogen laser features a pulse duration of 150±1 ns, pulse energy of 1.3±0.3 mJ, and a target irradiance of 5.7±0.5 kW/cm2 while the continuous argon laser provides an irradiance of 10±0.3 mW/cm2. The morphology, structure and optical properties of the prepared nanostructures were studied using a scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Visible, photoluminescence (PL), and Raman spectroscopy. The results confirm the formation of pure ZnO nanoflakes of the wurtzite structure. The laser-induced evolution of ZnO nanoflakes depends on the nature of the precipitating agent, laser energy and exposure time. The ZnO nanoflakes prepared using urea-assisted homogeneous precipitation is more advantageous than that precipitated with NaOH. Moreover, the pulsed nitrogen laser of higher irradiance demonstrated an enhanced formation of ZnO nanoflakes after 90 min of irradiation. The laser irradiation provides a facile synthetic route to pure ZnO nanostructures for various applications.
Raman spectroscopy of unknown mineral sample by solar pumped laser system
Authors: Abdel Hadi Yasser A , Ghazala M S Abo , Yousef Samir A , Rahoma U Ali , Elminawy Ahmed A 
Published: March 2020

Abstract
A detailed Raman spectroscopy study on an unknown sample by using compact solar-pumped (Nd:YAG) laser as an excitation source is simulated by using a primary parabolic concentrator mirror, Compound Parabolic Concentrator (CPC) to be used as an off-grid technique for identification unknown mineral samples. The unknown sample is exposed to the laser beam as the source of exciting photons at wavelength 532 nm. The frequencies of the scattered light are measured by using a highly sensitive spectrometer which detects in the range of (350 - 1150nm) with an optical resolution of 0.2 nm and 600 g/mm. The data are processed by an optical spectroscopy software to be compared with reference libraries. This study shows that the use of solar laser in the field of Raman spectroscopy is advantageous in increasing the precision of analyzing the materials and accordingly in reducing the costs of the analyzing process.
Exploration and Analysis of Container Architectural Adaptability Design in Central Jiangxi Province
Authors: Xiong Shenbing , Zhou Lintao , Wu Jiaqi , Tong Zhineng , Zhou Ming 
Published: March 2020

Abstract
Containers have always been used as materials in construction projects, and have the advantages of low carbon environmental protection, quick installation, convenient transportation, low construction price, and recyclable recycling. There is a potential for development in the field of sustainable buildings and fabricated buildings. Exploring the adaptability design of this modular unit can promote the industrialization of container construction. The purpose of this project is to make an in-depth discussion and study on the functional adaptability of container architecture in central Jiangxi Province province.
Discussion on Application of Energy Saving Technology in Green Building
Authors: Tong Zhineng 
Published: March 2020

Abstract
In the green building, in order to realize the sustainable development, it is necessary to use energy saving and environmental protection technology as far as possible in the design, construction and use of the building, reduce energy consumption, and realize the construction of the green building which is suitable for people to live. Green buildings run through the design, construction and use of the building, so we should consider the implementation and utilization of green buildings from the whole process.
Zigbee-based wireless gas monitoring sensor alarm system in coal mine
Authors: Jia Xuguang , Shi Fan , Guan Yongxing , Tang Shoufeng , Tong Minming 
Published: March 2020

Abstract
In view of the underground monitoring and monitoring system of coal mine, wired data transmission has been used in the past, but there are some disadvantages such as complicated wiring work, large amount of labor, fixed network structure which is not convenient to meet the dynamic requirements and low stability. Therefore, this study designs a monitoring system based on ZigBee wireless sensor network, wireless transmission, strong mobility, high reliability, low power consumption, strong real-time performance, etc, can be real-time monitoring of the coal mine environment parameters, including downhole temperature, humidity and gas concentration, and the acquisition of information sent by ZigBee wireless transmission way. STM32F103RBT6 is adopted as the wireless network processor in the system, which is responsible for establishing the network and transmitting data. NDIR HC sjh-5 CUBIC gas concentration sensor to collect underground mine data; Wireless SZOS embedded wireless communication module is used as the wireless sending and receiving port to enhance the wireless sending power. The software architecture adopts ZigBee protocol stack. The research shows that the proposed ZigBee wireless sensor network based coal mine underground gas monitoring system can help improve the real-time monitoring level and reduce safety risks in the complex and special environment of coal mine underground.
Experimental study on gas production optimization of pig manure and wheat straw under different pig manure levels
Authors: Chu Yajun , Liu Shengyong , Bai Hao , Zhang Shuqing , Peng Lei , Wei Dongdong , Lu Jie , Jie Libin , Pan Yibo 
Published: March 2020

Abstract
In order to explore the optimal ratio of pig manure and wheat straw mixed fermentation process, the experiment controlled the temperature of the fermentation control fermentation process to 35 °C, the total mass of the fermentation liquid was 700 g, and the total soild (TS) was 8%. The effect of pig manure content on fermentation. Based on the analysis of the gas production per unit of TS, when the pig manure content is 80%, the unit TS produced has the highest gas yield of 344 ml/g, which is 58.9% higher than that of pure wheat straw fermentation. Fermentation increased by 11.43%. In order to explore the best pig manure content in the fermentation process, regression analysis was performed on the gas production per unit of TS by origin. The result was that when the content of pig manure was 79%, the gas production was the highest, 336.3 ml/g, which was higher than that of wheat straw fermentation. 55.51%, 9.05% higher than pure pig manure fermentation. The methane content was used as the analysis result: when the pig manure content was 75%, the highest average methane content after start-up was 60.33%, which was 15.24% higher than that of wheat straw alone, and 3.4% higher than that of pig manure alone. Therefore, during the fermentation process of pig manure and wheat straw, when the content of pig manure is controlled at about 75%, the biogas production in the fermentation process and the methane content in the biogas can be effectively improved..
Analysis of Residential Space Structure Based on Housing Price in Lanzhou City
Authors: Li Mingtao , Guo Qianqian 
Published: March 2020

Abstract
Based on the residential POI (Point of Interest) data in the central district of Lanzhou, the spatial pattern of housing price were discussed using spatial auto correlation analysis. The results show that: the spatial variation of residence price in Lanzhou presented a point axle type pattern with the east-high and west-low feature. The spatial dependence and anisotropy were apparent in spatial variability of housing price, housing price in different directions have different degrees of spatial autocorrelation. Furthermore, with the increase of variation, the influence of structural components, such as traffic, environment and public service, were becoming more and more significant.
Establishment and analysis of damage calculation model under fuel air explosion effect
Authors: Zhang Xiaonan , Huang Qiang , Bai Xueyang , Liu Yexin , Gao Li , Sun Zhidan 
Published: March 2020

Abstract
Fuel air explosive has unique damage characteristics because of its different action mechanism. In this paper, through analyzing the damage mechanism and characteristics of fuel air explosive, the damage efficiency of fuel air explosive was quantitatively described by using overpressure and specific impulse. In combination with theoretical calculation and experimental fitting, the corresponding damage effectiveness calculation model of fuel air explosive was established. According to the actual application of fuel air explosive, the group of personnel was selected as the pseudomorphic target, the distribution area and relevant parameters of the target were set, so as to establish the corresponding damage criteria, which provided a reference for the effective evaluation of the damage efficiency of fuel air explosive.