bluuebunny/crossref_metadata_2025_split huggingface dataset:
Item analysis of teachnological pedagogical content knowledge (TPACK) in pre-service chemistry teachers using the Rasch Model application
Authors: Lestari Wahyuni Tri , Saputro Sulistyo , Masykuri Mohammad , Hastuti Budi , Ulfa Maria , Mulyani Sri , Yamtinah Sri 
Published: June 2020

Abstract
This research aims to analyze TPACK items using the Rasch model in terms of validity, reliability, item difficulty and bias items. The method used is descriptive quantitative with 34 pre-service chemistry teachers in semester VI consisting of 26 female students and 8 students from Sebelas Maret University (UNS). The instrument used in this study was the matter of Teachnological Pedagogical Content Knowledge (TPACK) which was adapted from the PPG Teachnological Pedagogical Content Knowledge (TPACK), which consisted of 30 multiple choice questions. The results showed that: 1) the validity of the suitability level of items was 27 questions that were fit and 3 questions that were not fit. 2) the results of raw variance data of 33.5% indicate that the requirements for Raw variance explained by measures of at least 20% can be met and the variance that cannot be explained by the instrument of 8.2% also meet the criteria ie, not to exceed 15%. 3) Reliability of pre-service chemistry teachers is 0.52 in the weak category, item reliability is 0.90 in the good category and reliability between pre-service chemistry teachers and items 0.64 in the sufficient category. 4) The level of difficulty of the questions is very difficult, difficult, easy, very easy and is dominated by questions that are categorized as difficult. 5) there are no questions that have a probability of less than 5% so there are no biased items. In conclusion, TPACK item analysis using the Rasch model is valid, reliable, item difficulty is very good and there are no biased items. So the questions that have been analyzed can be used to measure TPACK on pre-service chemistry teachers.
Numerical analysis of one dimensional heat transfer on varying metal
Authors: Mahardika D P , Haryani F F 
Published: June 2020

Abstract
Heat is an energy that we often encounter in our daily lives. Heat can be transferred from one medium to another, such as a solid medium. Heat transfer in a solid is called heat conduction or diffusion. Numerical analysis is one approach used to solve differential diffusion in many cases. In this paper, the concern is the proposed finite difference method to simulate one-dimensional heat transfer on varying metals. This numerical method utilizes the Neumann boundary conditions as well as the Taylor series in finding differential diffusion solutions. The solution obtained was applied and simulated in the case of heat transfer by conduction on various metals. From this simulation, we can obtain data in the form of temperature distribution across various metals by adjusting to boundary conditions. Then, the distribution is used to predict when various metals reach their equilibrium temperature. The final equilibrium temperature on varying metal must satisfy Thermodynamics Law. In order to illustrate the accuracy, the varying boundary conditions are presented. The results obtained in the form of temperature distribution will be simulated with the help of the MATLAB program to obtain conclusions from the objects of this paper. The conclusion indicates that using finite difference is accurate in some boundary conditions.
Bivariate zero inflated generalized Poisson regression model in the number of pregnant maternal mortality and the number of postpartum maternal mortality in the Central Java Province in 2017
Authors: Aini Q , Purhadi  , Irhamah  
Published: June 2020

Abstract
Excess zero is one of the problems in Generalized Poisson regression where the number of responses is contained zero exceeds 60 percent. One of the statistical methods have been developed is Zero Inflated Generalized Poisson Regression (ZIGPR). If there are two response variables, the appropriate regression analysis is Bivariate ZIGPR (BZIGPR). This study aims to determine the factors that influence the number of pregnant maternal mortality and the number of postpartum maternal mortality in 91 sub districts in Pekalongan Residency, Central Java Province 2017 through by the BZIGPR. The variables are percentage of K1 pregnancy examinations, percentage of K4 pregnancy examinations, percentage of deliveries assisted by health workers, percentage of pregnant women who received Fe3, percentage of TT2 + immunization in pregnant women, ratio of midwives per 100,000 population and percentage of obstetric complications management. The estimation of BZIGPR parameters using the Maximum Likelihood Estimation (MLE) method which results in a non-linear form so that, it is solved by the Berndt Hall-Hall Hausman (BHHH) iteration method. The result hypothesis testing using the Maximum Likelihood Ratio Test (MLRT) is reject null hypothesis. BZIGPR produces 2 regression models ln

μ
^

l
i

and logit

p
^

l
i

. The predictor variables that affect response Y1 and Y2 on model ln

μ
^

l
i

are all of predictor variables. The predictor variables that affect response Y1 on model logit

p
^

l
i

are all of predictor variables while the predictor variables that affect response Y2 are all of predictor variables except percentage of pregnant TT2 + immunization women and percentage of midwives per 100,000 population.
Redesign of road drainage system in jalan Banyumas Km 7 Selomerto, Wonosobo with normal discharge method
Authors: Faqih Nasyiin , Lestarini Wiji 
Published: June 2020

Abstract
In the rainy season the condition of the channel on Jalan banyumas Km 7 Wonosobo Regency is not able to accommodate the flow of water so that flooding often occurs. Because of that, it is necessary to redesign new drainage channels. This research is quantitative, the method used is to analyze both hydrologically and hydraulically to get the best drainage building design. From the calculated data, it can be concluded that the drainage channel on the Banyumas km 7 Selomerto road must be expanded or dredged at certain channel points where the expansion must take into consideration the current conditions in the field. For the most discharge (Q) is in the QF section with a discharge of 0.13517 m3 / second and the lowest is in the G7 segment with a discharge of 0.00308 m3 / second. From the calculation results obtained that channels 2, 3, 4, 5, 6 and 7 must be redesigned and made a new building.
Characteristics of mechanical properties of coir-fibre/rubber composite
Authors: Arrohman S , Mustofa A S H , Ariawan D , Diharjo K 
Published: June 2020

Abstract
Indonesia has the largest coconut land in the world with area of 3.88 million hectares producing 3.2 million tons of coconut. It produces a large amount of coir fibre and it is potential as reinforcement of composite material. The country also has large rubber forest land with industry investment opportunity of US $ 3 billion. The investigation of mechanical properties with different composition of coco fibre and rubber is needed to find its optimum properties of the porous natural composite. The specimens were varied in weight fraction between coco fibre and rubber (30:70; 50:50; 70:30). All specimens were tested with tensile testing in longitudinal and transverse direction to get its tensile properties and observed by macro photo. The result shows that the increasing of fibre reduces the strength and strain and it has optimum modulus for 50% fibre. This can be used as engineering consideration in producing of product, such as mattress and carpet.
Infrared absorption spectra analysis of TeO2-ZnO-Bi2O3-TiO2 doped B2O3 glasses
Authors: Fausta Devara Ega , Marzuki Ahmad , Cari  
Published: June 2020

Abstract
Boro-tellurite glasses with composition 60TeO2- (30-x)ZnO- 5Bi2O3- 5TiO2- xB2O3 (where x = 0,2.5, and 5 mol%) have been successfully fabricated by melt quenching technique. FTIR characterization was carried out in range 400-4000 cm−1 using a KBr pellet method to study the glass chemical bond. The results show that several absorption peaks were recorded in range 400-4000 cm−1. However, most of the absorption peaks were detected in the region 400-1600 cm−1. It can be divided into 5 groups from 400-450 cm−1, 620-650 cm−1, 900-940 cm−1, and 1100-1300 cm−1. The main absorption peak of TZBT glass located at 620-650 cm−1, which is the fingerprint of TeO2 glass from Te-O vibration of TeO4 units. The addition of B2O3 components constructed a new absorption at 930 cm−1 and 1100-1300 cm−1. The absorption at 930 cm−1 belongs to B-O vibrations of BO4 units. While the absorption at 1100-1300 cm−1 relates to B-O vibrations of BO3 units. For further investigation, the deconvolution process was performed to discover the effect of the addition of B2O3 in the main absorption spectra. It was confirmed that six bands detected in the main absorption peak. The effect of B2O3 reduces the absorption band and shift the wavenumbers in TZBT glass.
An analysis of student’s concepts understanding about simple harmonic motion: Study in vocational high school
Authors: Wardani Fitri 
Published: June 2020

Abstract
This study presents an analysis of the student’s concept of understanding about simple harmonic motion in vocational high school. The sample of the study consisted of 76 vocational high school students 1 Mondokan. The two-tier research instrument used to measure students’ understanding of concepts. The category of concept understanding assessment based on concept understanding indicators, i.e., no understanding, specific misconception, partial understanding with a specific misconception, partial understanding, and sound understanding. The results of the analysis of the quality of the instrument indicate the value of person reliability of 0.82, and item reliability of 0.76 is in a good category. The results showed that specific misconception was 14.6%, partial understanding with a specific misconception was 23.9, partial understanding 36.8%, and sound understanding 24.7%. These findings indicate the need to empower students’ understanding of concepts, using instructional media that can visualize abstract concepts of simple harmonic motion.
Vibration analysis of Kartini reactor secondary cooling pump using FFT analyzer
Authors: Ahmadi H , Subchan M , Rachmanita R E , Audora R D , Wibuana A 
Published: June 2020

Abstract
The vibration of the secondary cooling system the Kartini reactor works to remove heat from the primary cooling system so that the heating element stays below the safety limit of the specified operating temperature. One component that is supported is a pump that is needed one of them by the vibration analysis method. By using vibration analysis, the type of cause of damage to the pump can be detected without dismantling the pump, so that it can provide predictability of maintenance time, scheduling repairs, picking up damaged equipment before hazardous needs. Vibration measurement with vibration meter (Lutron VB 8202) is carried out on the bearing housing of the secondary cooling pump motor housing in the direction: vertical, horizontal and axial. The value of the vibration compared with the vibration pump standard (ISO 10816-3). From the results of pump vibration measurements, there are several pump parts whose conditions are classified as vibrations that can cause damage to these components, namely the pump motor section. The average vibration on the pump motor is 5.74 mm / s greater than 4.5 mm/s that is classified as a vibration velocity value which can cause damage to other pump components. The results of the symptom analysis of variations in the vibration of abnormal values in the pump motor are caused by looseness of rotation and damage to roller bearings.
Investigation of undergraduate student concept understanding on Hydrostatic Pressure using two-tier test
Authors: Cari C. , Pratiwi Scundy Nourma , Affandy Harry , Nugraha Dewanta Arya 
Published: June 2020

Abstract
Investigating students’ understanding of the concept of hydrostatic pressure is based on the importance of this understanding to be able to master static fluid material. This study uses qualitative methods to investigate the understanding of student concepts on the topic of hydrostatic pressure. The sample used in this study was 206 undergraduate student physics and undergraduate student physics education at Universitas Sebelas Maret, and Universitas Islam Negeri (UIN) Sunan Kalijaga Yogyakarta. The results of the analysis show that ten items developed were declared valid in content based on expert judgment. This is evidenced by the acquisition of V index of 0.99, while the Vtable is 0.92. The reliability estimation results obtained by the value of person reliability (testee) of 0.82, and reliability items of 0.75. It can be concluded that the consistency of the answers from either the testee or from the item in question has high reliability. The results of the investigation showed that there were many undergraduate students after studying physics, not being able to understand even in the simplest parts. Some concepts have been misunderstood; this has led to undergraduate students considering physics as a difficult, complicated, and time-consuming science to be able to understand it.
Engineering design behavior elementary student’s through the STEM approach
Authors: Firdaus A R , Rahayu G D S 
Published: June 2020

Abstract
This study aims to obtain an overview of the engineering design behavior students at the elementary school level. This research was carried out using the Pre-Experiment method with Pretest-posttest One-Group design. The lesson is implemented using learning based on Science, Technology, Engineering and Mathematics (STEM) where the learning method refers to the Engineering Design Process. The stages consist of problem scoping, idea generation, design and construct, design evaluation and re-design. Data analysis uses quantitative descriptive analysis. Observations of the engineering design behavior students revealed that in the first phase, students who learned through STEM were categorized as beginner designers and in the second phase as emerging designers. The conclusion of this study is that STEM-based learning can improve the engineering design behavior of elementary students.
Mathematics communication ability in statistica materials based on reflective cognitive style
Authors: Shodiqin A. , Waluya S.B. , Rochmad  , Wardono  
Published: June 2020

Abstract
This study aims to explore the mathematical communication of students based on Reflective cognitive style. This research is a qualitative research that is descriptive qualitative. The subjects in this study were students who took statistics methods, the selection of research subjects with a purposive sampling technique, the validity of the data was obtained by the method triangulation technique. Data analysis with the process: (1) reduction data, (2) presentation data; and (3) making conclusions and verification. The results of this study are: (1) SM subjects are able to propose hypotheses by making convince statements related to the problem given, but in guessing hypotheses tend to require a relatively long time, (2) SM subjects can understand and evaluate ideas in mathematics in problems solving in writing, (3) subjects are able to present and read tables, and graphs, as well as fill out the things that are known and asked completely and correctly, (4) the subject SM is able to conclude the answer from the results of solving the problem in accordance with the question, (5) able to complete and clear in communicating his ideas to others verbally, clearly and completely, but tends to take a long time. By studying or analyzing mathematical communication on statistical methods based on reflective cognitive style, it will certainly improve mathematics learning.
The difficulties of students when solving HOTS problem and the description of students cognitive load after given worked example as a feedback
Authors: Asrafil  , Retnawati H , Retnowati E 
Published: June 2020

Abstract
The study aims to describe the obstacles of high school mathematics teachers in teaching the distance and angle of the three dimensions materials. This research is a descriptive exploratory study with a qualitative approach. We collected the data using interviews and questionnaires. The subject was 11 mathematics teachers of SMA, SMK, and MA in Semarang City and Demak Regency. The data was analyzed by looking for themes and determining inter-theme relations to gain an understanding. The findings are as follows. First, obstacles faced by mathematics teachers to teach the distance and angle of the three dimensions materials are teachers’ limited professional competence, students’ difficulties in understanding the concept, students’ difficulties in thinking, and the need for proper learning media. Second, some efforts made by teachers to overcome and expect obstacles happened namely discussing problems with other senior teachers, preparing and learning the materials that require special attention, using visual media, provides exercises with many types, close to psychology with students, and testing various proper teaching models and methods of three-dimension materials.
Effectiveness of problem solving-based module to improve analytical thinking
Authors: Karenina Aziza , Widoretno Sri , Prayitno Baskoro Adi 
Published: June 2020

Abstract
This research is the result of the effectiveness test of analytical thinking using the integration of problem solving and analytical thinking aspects in the of the human respiratory system material. The problem-solving aspects are identify, define, explore, act, and look back while the aspects of analytical thinking are differentiating, organizing, and attributing. The research method used was quasi-experimental. There were 74 participating students divided into two classes, namely the control class and the experimental class. The effectiveness of the analytical thinking process is based on two types of questions, namely multiple-choice and metacognitive questions. The results show that 1) the average score of the analytical thinking process using multiple-choice questions of the experimental class (76.95) is higher than that of the control class (65.20); 2) the average score of the analytical thinking process using multiple-choice questions of the experimental class (61.72) is higher than that of the control class (60.63); and 3) the average score of aspects of the analytical thinking process of the experimental class is higher than that of the control class, but the students obtain the lowest score in the organizing aspect.
Analysis of STEM-PBL based e-module needs to improve students’ critical-thinking skills
Authors: Purnamasari Dian , Ashadi  , Utomo Suryadi Budi 
Published: June 2020

Abstract
STEM is a learning approach that integrates the teaching of science and mathematics through scientific inquiry, technology and engineering, and mathematical analysis to develop 21st century skills. One of them is critical-thinking skills that are thinking skills involving cognitive, analytical, rational, and logical processes and inviting students to do reflective thinking to problems. The application of STEM which is integrated with problem-based learning and packaged in an e-module will produce creative individuals with critical thinking. The design of the research uses qualitative description. It aims to investigate the need for teaching materials in the form of STEM-PBL based e-Module and critical thinking profiles of students in senior high schools. The subjects of the research were 75 students and 1 chemistry teacher. The data were collected through several techniques such as interviews, questionnaires and critical-thinking essay tests. The results show that students cannot think critically in solving chemical problems and need teaching materials in the form of STEM-PBL-based e-Modules.
ICT-Based Learning Media to Enhance Students’ Problem Solving Ability in Efforts to Face the Industrial Revolution 4.0
Authors: Herdianto E N , Mardiyana  , Indriati D 
Published: June 2020

Abstract
This study aimed to describe the feasibility of ICT-based learning media to improve student’s abilities in mathematical problem solving to face the industrial revolution 4.0. This research developed by four D method, consist of define, design, develop and disseminate. The stages include analysis of potential and problems, the formulation objectives of the research, preparation of research instruments and learning media design, validation and revision of learning media, and implementation. Product trials were conducted in two different classes. The results showed that ICT based learning media were valid for use, in terms of the results from media expert validation. ICT-based learning media also meet practically and effectiveness for use in learning mathematics and can improve students’ problems-solving ability, reviewed from evaluation tests that were developed show the results that students who use ICT-based learning media have better problem solving skills.
Developing environmental awareness through experiential learning: A critical analysis of higher education students’ practices
Authors: Widyastuti Fatma , Probosari Riezky Maya , Sajidan  , Saputro Sulistyo , Sutikno  
Published: June 2020

Abstract
Today’s higher education students recognize the importance of environmental issues, but the traditional learning curriculum is weak in opportunities for students to experience the link between the theory and practice of environmental sustainability. The aims of this study were given information about higher education students’ awareness of the environment according to their experiences. Furthermore, implementing best practices in Experiential Learning. Environmental awareness is an attitude in seeing and managing the environment surrounding. It is about the way how students thinking and viewing about surrounding based on their own perspectives. Experiential Learning is referred to learning by doing, experiencing, discovering, and exploring. It is a philosophy and methodology where educators intentionally involve with students in direct experience and focused reflection to improve knowledge, develop skills, and clarify values. The method of this study was descriptive qualitative research and the data were analyzed by the Rasch model. The participants were 30 physics students of semester two in Environmental Science/Ilmu Pengetahuan Lingkungan (IPL) subject. The students conducted in practice through experiential learning to gain the data. The results of this study concluded that students’ awareness of the environment was based on their existing and recent experiences.
Adaptive reasoning and procedural fluency in three-dimensional
Authors: Kusuma Dewi I.L , Waluya S.B , Rachmad  , Firmasari S 
Published: June 2020

Abstract
This research is motivated by the difficulty of students determining the angle between a line and a plane in the construction of three dimensions. Students sometimes hesitate to identify the algorithm that will be used to solve the distance and angle problems in the three-dimensional material in the lecture of Capita Selecta. Based on this, this study aims to analyze the adaptive reasoning abilities and procedural fluency of students in solving three-dimensional problems. The method used in this study is a qualitative method with a descriptive design. The research was conducted on 20 students. The results of this study indicate students can think logically in choosing the right concepts and situations and are accurate in doing calculations. Students also have shown the correct procedure by making fields through the CF line and ⊥ ACH fields. The algorithms used by students are varied so that students are found to have not been precise in determining the projection length of the CF line. It can affect the angle between the CF line and the ACH plane obtained.