bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Experiment of Heat Matter Based on Scientific Inquiry in Senior High School
Authors: Purba Emelia Rosa , Siregar Nurdin , Sinulingga Karya 
Published: March 2021

Abstract
This study aims to determine (1) whether the science process skills of students who are taught with the scientific inquiry model are better than students who are taught using conventional learning, (2) whether the critical thinking skills of students who are taught with the scientific inquiry model are better than in students who are taught with conventional learning. This type of research is a quasi-experiment with two groups pretest-posttest design. Sampling was carried out by means of cluster random sampling by taking two classes from three classes, namely class XI IPA-3 as the experimental class, amounting to 30 people and class XI IPA-1 as the control class, amounting to 31 people. The instruments used were tests and non-tests in which science process skills were in the form of student worksheets and critical thinking skills were in the form of essay questions consisting of 5 validated questions. Hypothesis testing using different test (t-test). Based on the results of the study, it was concluded that: (1) the science process skills of students who were taught with the scientific inquiry model were better than those who were taught using conventional learning, (2) the critical thinking skills of students who were taught with the scientific inquiry model were better than in students who are taught with conventional learning.
Effective cost and high-performance supercapacitor electrodes from Syzygium oleana leave biomass wastes
Authors: Taer Erman , Ridholana Resta Edra , Apriwandi  , Taslim Rika , Agustino  
Published: March 2021

Abstract
Effective cost and high-performance supercapacitor electrodes were prepared using Syzygium oleana leave biomass wastes. Simple one-stage integrated pyrolysis is adopted to get the porous activated carbon monolith without the addition of synthetic materials. The carbon samples were chemically activated by using sodium hydroxide. Four different carbonization temperature of 550 °C, 600 °C, 650 °C, and 700 °C have been evaluated and compared for their electrochemical behavior in supercapacitor cells. The physical characteristics were obtained using dimensions reduction and an X-ray diffraction method. The electrochemical properties of the porous activated carbon monolith were studied using cyclic voltammetry technique. Furthermore, two different aqueous electrolytes were selected to improve the electrochemical behavior of the electrode such as 1 M H2SO4 and 6 M KOH with low scanning rate of 1 mV s−1. The capacitive of symmetric supercapacitor showed high specific capacitance of 153 F g−1. Moreover, the maximum specific energy and specific power were found as high as 21.25 Wh kg−1 and 76.57 kW kg−1 at the voltage window of 0-1.0V. The simple and economically friendly method demonstrated to obtained porous activated carbon monolith derived from Syzygium oleana leaves waste makes them excellent candidates for future electrode materials of energy storage technologies.
Characteristic polynomial and eigenvalues of anti-adjacency matrix of directed unicyclic corona graph
Authors: Hasyyati N , Sugeng K A , Aminah S 
Published: March 2021

Abstract
A directed graph can be represented by several matrix representations, such as the anti-adjacency matrix. This paper discusses the general form of characteristic polynomial and eigenvaluesof the anti-adjacencymatrix of directed unicyclic corona graph. The characteristic polynomial of the anti-adjacency matrix can be found by counting the sum of the determinant of the anti-adjacency matrix of the directed cyclic inducedsubgraphs and the directed acyclic induced subgraphs from the graph. The eigenvalues of the anti-adjacency matrix can be real or complex numbers. We prove that the coefficient of the characteristic polynomial and the eigenvalues of the anti-adjacency matrix of directed unicyclic corona graph can be expressed in the function form that depends on the number of subgraphs contained in thedirected unicyclic corona graphs.
Hub and Spoke allocation to minimize the distance and frequency of transportation with Lower Noise Consideration
Authors: Aurachman R 
Published: March 2021

Abstract
City logistics is a concept that has developed lately. One method that can be applied is the application of Hub and Spoke in the Urban Logistics system. Hubs and spoke are commonly used for logistics systems in general. However, for hub and spoke in urban logistics systems certainly have different considerations. Using the system methodology, this paper proposes a mathematical model of the application of hub and spoke in urban logistics systems by considering several constraints, one of which is the minimization of noise caused by the transportation process.
Common closed neighbourhood prime labeling
Authors: Rinurwati  , Alfiyani A S 
Published: March 2021

AbstractLetG= (VG,EG) be a connected graph of ordern.A bijectiong:VG→ {1,2,3,…,n} is said to be prime labeling if for each two distinct verticesa,b ∈Vcwhichais adjacent tob, gcd(g(a),g(b))= 1. A graph that satisfies the prime labeling is called a prime graph. Graph G is a neighbourhood prime graphif there is a bijectiong: VG→{1,2,3,…,n}so that for each vertexa £ VGwithdeg(a) >1,gcd{g(b): b £ N(a)} =1. Graphs that have neighbourhood-prime labeling are called neighbourhood prime graphs. In this paper, we introduce a new variant of labelingas a development of prime labeling and neighbourhood prime labeling called common-closed-neighbourhood prime labeling. A bijectiong: VG→ {1,2,3, …,n}is said to be common closed neighbourhood prime labeling if for each two distinct verticesa,b∈VGwhichais adjacent tob, gcd{g(c):c∈N[a,b]} = 1, whereN[a,b] =N[a] ∩N[b]. A common-closed-neighbourhood prime graph is a graph that satisfies the common closed neighborhood prime labeling. Also, we studied an algorithm for some graphs which admits common closed neighbourhood prime labeling.
On the local antimagic labeling of graphs amalgamation
Authors: Kurniawati Elsa Yuli , Agustin Ika Hesti , Dafik  , Marsidi  
Published: March 2021

Abstract
Let G be a simple connected graph, an ordered pair of sets G(V, E), with V is a set of vertices and E is a set of edges. Graph coloring has been one of the most popular branches in topics of graph theory. In 2017 Arumugam et al. developed a new notion of coloring, namely local antimagic coloring of a graph. This concept is a combination of graph labeling and graph coloring. The local antimagic of graphs is one of the colorings of graph theory that is interesting to study. By the definition, the local antimagic coloring is a bijection f : E(G) ƒ> {1, 2, 3,…, |E(G)|} if for any two adjacent vertices u and v, w(u) = w(v), where w(v) = ΣeeE(v) f (e), and E(u) is the set of edges incident to u. Thus any local antimagic labeling induces a proper vertex coloring of G where the vertex v is assigned the color w(v). The local antimagic chromatic number xla(G) is the minimum number of colors taken over all colorings induced by local antimagic labelings of G. In this paper, we will study the local antimagic coloring of amalgamation of graphs.
On the irregular coloring of bipartite graph and tree graph families
Authors: A’yun Q , Dafik  , Adawiyah R , Agustin Ika Hesti , Albirri E R 
Published: March 2021

Abstract
This article discusses irregular coloring. Irregular coloring was first introduced by Mary Radcliffe and Ping Zhang in 2007. The coloring c is called irregular coloring if distinct vertices of G have distinct codes. The color code of a vertex v of G with respect to c is code(v) = (a0, a1, a2,…, a
k) = a0a1a2, …ak, where a0
= c(v) and ai, (1 < i < k) is the number of vertices that are adjacent to v and colored i. The minimum k-color used in irregular coloring is called the irregular chromatic number and is denoted by \ir. Irregular coloring is included in proper coloring, where each vertex that is the neighbors must not be the same color. The graphs used in this article are a family of bipartite graphs and a family of tree graphs, including complete bipartite graphs, crown graphs, star graphs, centipede graphs, and double star graphs.
Comparison Backpropagation (BP) and Learning Vector Quantification (LVQ) on classifying price range of smartphone in market
Authors: Anshori M Y , Rahmalia D , Herlambang T 
Published: March 2021

Abstract
In this time, there are many smartphones sold in market with various price. The price of smartphone depends on some components such as weight, internal storage, memory (RAM), rear camera, front camera and brands. In this research, there are two methods for classifying price range of smartphone in market, i.e. Backpropagation (BP) and Learning Vector Quantization (LVQ). From classifying price range of smartphone in market using BPand LVQ, there are the differences on the both of them. BP classifies price range of smartphone by gradient descent of target and output on its iteration. LVQ classifies price range of smartphone by euclideandistance of weight and data on its iteration. Based on simulations, BP gives better accuracy value with value 88.75 % in training data and 87.5 % in testing datathan LVQ with value 81.25 % in training data and 72.5 % in testing data
The process of student analytical thinking in understanding and applying lattice method to solve mathematical problem
Authors: Annizar A M , Sofiah  , Lestari A C , Dalimarta S , Wulandari Y N 
Published: March 2021

AbstractOne of the educational objectives that is to improve analytical thinking skills. An improvement in analytical thinking skills can be initiated by analyzing the student’s thinking process when faced with a new problem. Meanwhile, the Lattice Method is a method of multiplication which is very rarely taught in the school so that few students know about. Therefore, this research aims to describe the process of analytical thinking students in understanding and applying the Lattice Method to solve mathematical problems. The method used in this research is descriptive with a qualitative approach. The data has collect with tests and interviews. The subject’s determination uses a purposive sampling technique. The results showed that four subjects had interesting thought processes in understanding and applying LatticeMethod that they had never previously studied. S1 is able to understand the LatticeMethod in multiplication by explaining in detail the correct systematic and correlating the problem using the LatticeMethod. S2 is able to understand the problem but still not able to explain properly. S3 is able to understand the problem in its own way with the concept taught earlier. While, S4 is able to understand the problem in its own way without the concept of LatticeMethod.
The development of geometry test to analyze students’ creative thinking skills in the area of square formula derivation
Authors: Aini N R , Susanto S , Yudianto E , Wijaya H T , Cahyanita E 
Published: March 2021

AbstractTechnology advances demand students to adapt creatively in solving problems. This research is development research with the intention of producing a certain product that validity, practicality, and effectiveness be tested, where the development process is described as thorough as possible then evaluated. This development of geometry test used Thiagarajan model or known as 4-D consisting of define, design, develop, disseminate stage. Geometry test that have been developed are used to describe students’ creative thinking skills. This creative thinking is divided into four things that are fluency, flexibility, elaboration, originality. The subjects in this research were 3 students of 32 Junior High School Class consisting of students in visualization, analysis and informal deduction level. Data retrieval in this research was done by using a test and interview. Based on the research result data, three students fulfilled creative thinking skills, among them student was classified as the category of quite creative (TKBK 2), who were fulfilling the indicator of fluency and flexibility, student was classified as the category of less creative (TKBK 1), who were fulfilling the indicator fluency, and student was classified as the category of creative (TKBK 3) so that fulfilling the indicator of fluency, flexibility, originality.
An analysis of the ability to apply student problem solving concepts and algorithms in online and offline learning systems based on realistic mathematical approaches
Authors: Sipayung T N , Simanjuntak S D , Wijaya A , Sugiman  
Published: March 2021

Abstract
In the problem solving requires the ability to apply concepts and algorithms. Problems of particular concern in this regard are math problems related to everyday life. The abilities of each student are different and need to be analyzed. Therefore, a qualitative study with descriptive methods was carried out to determine the students’ problem-solving abilities in applying concepts and algorithms. But in this case, the research subjects were selected randomly and divided into two parts, namely students who applied offline and online learning with 5 discussion groups each. The research subjects were VII students of SMP RK Serdang Murni and SMP HKBP Lubuk Pakam. Based on problem solving on the student worksheet on the material of addition and subtraction of integers based on a realistic mathematics approach, it was obtained data that the ability to apply problem-solving concepts and algorithms in groups of students who applied offline learning tended to be better than the group of students who applied online learning. This was concluded based on results of problem solving carried out by the group of students. Therefore, it is hoped that the ability of teachers to design online learning will be further improved regarding the use of technology so that the results obtained are as good as the implementation of offline learning.
Analysis of cognitive level biology exercise questions in science text books based on TIMSS frame work
Authors: Salsabella S , Juanengsih N 
Published: March 2021

Abstract
In the book, exercise questions are given to discuss the content taught by focusing on these exercise questions. One of the best feature of the book is that it includes many drill materials and assignments. Books are one of the reasons for the variation in the results of Indonesian student achievement. So it is essential to conduct an analytical study of existing textbooks, especially in terms of the implementation of the cognitive level contained in the exercises.This study aimed to describe the cognitive level of biology exercise questions in science textbooks based on TIMSS 2015 frameworks. The method of this research was a descriptive research method with a qualitative approach. This study used two science textbooks with a different publisher, namely book A and book B, which the most used in South Jakarta Junior High School. The instrument used was sheets document analysis. To analyze the questions used indicators in the TIMSS framework as a guide. The result showed that biology exercise questions in book A were contained 54,45% knowing domain, 29,25% applying domain, and 16,3% reasoning domain, while in book B was contained 80,2% knowing domain, 13,43% applying domain, and 6,33% reasoning domain.
The antioxidant activity of roselle and dragon fruit peel functional drink in free radical inhibition
Authors: Suryaningsih S , Muslim B , Djali M 
Published: March 2021

Abstract
This paper investigates the antioxidant of roselle and dragon fruit peel functional drink in free radical inhibition. Roselle free radical inhibition was determined at variations in temperature and heating time of 40, 50, 60°C, and 5, 10, and 15 minutes. For dragon fruit peels 60, 80, 100°C and 5, 15, and 25 minutes. The functional drink formula consists of roselle extract and dragon fruit peel (50%: 50%), 65% sucrose. The inhibition ability of roselle extract and dragon fruit peel and functional drinks were tested using the DPPH (2,2-diphenyl-1- picrylhydrazyl) method. The experimental design was a Complete Randomized Design. All chemical analyses reported as mean. Anova and Duncan (P≤0.05) test.The results showed that the optimum free radical inhibition ability of roselle extract at 60°C for 5 minutes 80.679% and dragon fruit peel at 100°C for 25 minutes 72.588%. The functional drink formula of roselle extract and dragon fruit peel (50%: 50%) could inhibit free radicals by 65.057% with phenols content of 317.59 ppm. The functional drink formula of roselle and dragon fruit peel contains antioxidants that have the ability to inhibit free radicals, which is considered as an alternative to functional drinks that are very beneficial for body health.
Improving students’ higher order mathematical thinking skills in accelerated classes through purdue learning model
Authors: Kadir  , Rukman D F 
Published: March 2021

Abstract
The acceleration program is a positive alternative for intellectually gifted students to obtain relevant education with their potential to develop optimally. The purpose of this study was to improve higher order mathematical thinking skills (HOMTS) in accelerated class students through the Purdue learning model. The research was conducted at one of the state junior high schools in Tangerang Selatanfor the 2016/2017 academic year. The research method was Classroom Action Research (CAR) in two cycles. Data were collected using observation sheets, daily journals, and tests. The results revealed that the application of the Purdue learning model could increase the average HOMTS of 63.75 in the first cycle to 74.25 in the second cycle. The improvement of HOMTS includes aspects of analyzing, evaluating, and creating. Student activities including visual, oral, writing, drawing, motor, mental and emotional also increased in the very good category. In addition, the results of the study also revealed that most students gave positive responses to the Purdue learning model. The conclusion of this study is that the application of the Purdue model in mathematics learning can improve HOMTS, activities, and students’ positive responses.
Semantic networks as mental representation of students in reading images on cell biology
Authors: Juanengsih N , Rahmat A , Wulan A R , Rahman T 
Published: March 2021

Abstract
A semantic network is a network that represents semantic ties between concepts or a network of frames. It is also used as a type of knowledge representation.This study aims to obtain an overview of the student’s mental representation; it’s formed when reading the image on cell biology. Participants in the study were 31 students (age 19-20) of Biology Education in the 2018/2019 academic year who attended a Cell Biology lectureat a university in Jakarta, Indonesia. After attending Cell Biology lectures, student’s mental representation was measuring. The instrument used to measure mental representation is a worksheet, a modified version of the mental representation measurement model with the CNET-Protocol. The images read by students consist of two pictures, namely the transcription initiation complex and the translation initiation complex. The results showed three semantic network patterns describe students’ mental representations, and each student has a different pattern and quality of mental representation. Based on the research findings, biology educators are encouraged to train students to read pictures of biology.
Implication of thinking maps assisted inquiry model for higher order thinking skills (HOTS) on chemistry
Authors: Kharismayuni E , Feronika T , Yunita L 
Published: March 2021

Abstract
The 2013 curriculum emphasizes a learning system that can build students HOTS. The Inquiry Model is known to increase HOTS. Even though it is effective for increasing HOTS, the Inquiry model has shortcomings soThinking Maps are needed. The research objective was to determine the effect of the use Inquiry model assisted by Thinking Maps on HOTS in chemistry. The research method used a Quasi Experiment with a research design of Non equivalentPretest and Posttest Control. The research design group consisted of a control and experimental group. The research sample involved students of class X MIPA 1 and MIPA 2 in high schools at Depok with a total sample of 25 students who were taken using purposive sampling technique. The data were obtained from 25 multiple choice instruments of HOTS. The results of the posttest hypothesis test using the Independent Sample T Test indicate that the Sig. 2-tailed is 0.021 <a (0.05), which means it is accepted. The results of the data obtained were then analyzed. The results showed that there were implications for the Inquiry learning model assisted by Thinking Maps on HOTS in chemistry. The Thinking Maps assisted Inquiry Model can train HOTS on students.
Patients Data Extraction from DDO Files Extension using Rule-based Classification Algorithm
Authors: Alam Nur , Amin Mukhlis , Hazriani  , Yuyun  
Published: March 2021

Abstract
Arrangement patient’s report process of Elim Rantepao hospital is especially complicated because patient data was obtained from FCR Console Prima what saved as DDO file extension as Unicode string. This problem makes understanding and select data manually become difficult. This research tries to give a solution on how to arrange reports easily through application tools developing. This research uses a rule-based classification algorithm to extract Patient Name, Age, ID Number, Date, and time. Applying this algorithm, increase system performance up to 96,6%. This application is very accurate as long as the file DDO has not broken.
Analysing Tourism Application Using Information Technology Governance Trust Model in COVID-19 Pandemic Situation
Authors: Setyadi R 
Published: March 2021

Abstract
At the beginning of 2020, Indonesia was shocked by the COVID-19 pandemic. One of the areas affected by the COVID-19 outbreak is tourism. In the tourism sector, the Indonesian government is closing tourism activities to minimize the transmission of the COVID-19 virus. The tourism sector has been a mainstay of income for tourism village communities and supports its foreign exchange earnings. This study analyzes local government tourism applications using IT governance trust (ITGT)in the COVID-19 pandemic situation. The method used is by distributing questionnaires to application makers and government employees who use tourist applications. Data were analyzed inferentially using quantitative Smart-PLS analysis. The application of multiple regression techniques to analyze questionnaire data on mobile tourism applications’ reliability and validity during the COVID-19 epidemic. This article used descriptive research to respond to the implementation of IT governance (ITG). The statistical results obtained indicate that the quality of information, system quality, and service quality of the tourism mobile application significantly affect user confidence in using tourism applications. Thus, this study contributes to recommendations for using the ITGT model to determine the extent to which tourism applications can prepare themselves to improve their tourism applications during the COVID-19 pandemic. This study provides direct information to practitioners about what to consider in enhancing tourist application features, especially in the COVID-19 pandemic situation, so there is a need for ITG in planning reliable tourism applications during the COVID-19 pandemic.