bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and Structural Properties of Sm3+ doped Sodium Lithium zinc Lead Borate Glasses
Authors: Rajagukguk Juniastel , Situmorang Rappel , Nasution Budiman , Rajagukguk Donna Helen , Retno Susilorini Rr M I , Sarumaha Chayani S , Kaewkhao Jakrapong
Published: March 2021

Sodium lithium zinc-lead borate glasses co-activated with Sm3+ ion were prepared by melt and quenching method. The glass composition regarding to (65 – x)B2O3 : 5ZnO : 5Li2O : 15 Na2O : 10PbO: x Sm2O3 chemical formula is synthesized with x = 0.0; 0.05; 0.1; 0.5; 1.0; 2.0 and 4.0 mol.%. These samples which are labeled as Sm_0.0; Sm_0.05; Sm_0.1; Sm_0.5; Sm_1.0; Sm_2.0 and Sm_4.0 respectively. The structural characteristic was investigated and analyzed by using the FTIR and XRD. Moreover, physics properties such as molar weight, density, molar volume, refractive index, etc were calculated with the standard equations. From the measurement and calculation, the density was found to increase slightly by showing linear trends with Sm2O3 content in the glass network structure. It was happened due to the compactness level of glass structure and geometrical arrangement have modified in the glass network. The molar volume of the glass samples also gradually increases from 28.185 cm3/mol to 29.613 cm3/mol. From the FTIR and XRD analysis can be confirmed that the present samples are amorphous without the presence of the crystalline peak.
Determination of Total Tannins and Antibacterial Activities Ethanol Extraction Seri (Muntingia calabura L.) Leaves
Authors: Gurning K , Simanjuntak H A , Purba H , Situmorang R F R , Barus L , Silaban S
Published: March 2021

This research aims were to determine the total tannin level and to test the antibacterial activity of the ethanol extract of Muntingia calabura L., leaves. The extraction was carried out by maceration method with ethanol solvent. Determination of total tannin content was carried out by colorimetric method which was measured at a wavelength of 745 nm using UV-Vis spectrometry and tannic acid was used as the standard. The antibacterial activity test was carried out by diffusion disc method against, such as Escherichia coli, Salmonella typhi and Propionebacterium acnes bacteria. The variations in the concentration of the ethanol extract of M. calabura included 12.5%; 25%; 50%, and 75%. Chloramphenicol was used as positive control and DMSO 10% as negative control. The results showed that the ethanol extract of the M. calabura leaves had a total tannin level of 0.0655±0.0002 mg/g d.w (Mean±SD). Antibacterial activity of ethanol extraction by the M. calabura leaves against E. coli (14.18±0.96; 15.53±0.40; 15.92±1.27; and 16.50±0.52), S. typhi (13.37±0.35; 14.47±1.14; 14.97±0.87; and 15.50±0.66), and P. acnes (14.13±0.24; 14.60±0.20; 15.52±1.14; and 16.37±0.46). Antibacterial activity of Chloramphenicol against E. coli, S. typhi and P. acnes are 31.25±2.08; 25.15±1.61; and 23.25±4.42.
Analysis of denial of service attack on web security systems
Authors: Iswandi Walad S. , Zarlis Muhammad , Syahril Efendi M.IT
Published: March 2021

In this study, an analysis of the Web security system from a Denial-of-Service Attack (DoS) with SYN Attack, Ping of Death, Land Attack, Smurf Attack and UDP Flood types. The server computer that will be tested for DoS attacks is a local web server including humpuss.com IP: 54.169.71.56, horasindo.com IP: 104.152.168.14, kinarsih.com IP: 156.67.210.132, padanglws.co.id IP: 202.162. 207,101 and arianaas.com with IP Address 213.136.83.52 port 80. The attack on the local web server computer was carried out through attacking cloned computers as many as 5 zombie computers and then observing data traffic on each Web server computer. The test results use ping to the local web server computer, where the target web server sends a replay request time out and the check results in the Google Chrome browser are slow to inaccessible conditions. Ping access time the greater the packet, the greater the average time when accessing a local web server with 5,000 packets is 242.68 seconds, 10,000 packets is 310.28 seconds, 20,000 packets are 337.4 seconds, 30,000 packets are 377.2 seconds, 40,000 packets are 398.4 seconds, 50,000 packets are 545.4 seconds and 100,000 packets are above 600 seconds with the condition that the web server will recover after 600 seconds where the system recovery process depends on each local web server.
In-Vitro Dissolution and Characterization of Self-Emulsifying Drug Delivery System of Artemisinin for Oral Delivery
Authors: Utami Debri , Meliana Yenny , Helmiyati  , Budianto Emil
Published: March 2021

Artemisinin is a compound extracted from Artemisia Annua. Artemisinin is used globally as the first-line antimalarial drug. Despite its high efficacy against the malaria parasite, artemisinin has low bioavailability because it has low solubility in water. This present study was conducted to prepare and characterize the self-emulsifying drug delivery system of artemisinin to increase the dissolution profile of artemisinin. The stability of the resulting emulsion was observed visually for 6 hours. Droplet size, polydispersity index, and zeta potential of the emulsion were measured using Nano Particle Analyzer. The optimum formulation was evaluated with the dissolution test and compared with the artemisinin crystal. Several formulations have good stability of the resulting emulsions where no creaming or flocculation was formed during the observation. Droplet sizes of the resulting emulsions ranged from 114.17-247.93 nm and the polydispersity index of the emulsions ranged from 0.35- 0.56. Zeta potential values of the selected formulations were found in the range of -23.23 - -2.33 mV. Fourier Transform Infrared Spectroscopy spectra of self-emulsifying drug delivery system showed the presence of artemisinin in the formulation with lactone and peroxide peaks. The dissolution of artemisinin in the self-emulsifying drug delivery system was significantly increased compared to artemisinin crystal. Artemisinin was released up to 98,6 %in 150 minutes in self-emulsifying drug delivery system formulation.
On the rainbow connection number of triangle-net graph
Authors: Yulianti L , Nazra A , Muhardiansyah  , Narwen
Published: March 2021

Let G be an arbitrary non-trivial connected graph. For every two vertices u and v in G, a (u,v)-path in G is called a rainbow (u,v)-path if all edges are colored differently. Next, a rainbow (u, v)-geodesic in G is a rainbow (u,v)-path of length d(u,v). Graph G is rainbow connected if for every two vertices u,v ∈ V(G), there exists a rainbow (u,v)-path. If there exists a rainbow (u, v)-geodesic in G for every two vertices u, v ∈ V(G) then G is strongly rainbow connected. The rainbow connection number rc(G) is the minimum number of colors needed to make G rainbow connected, while the strong rainbow connection number src(G) is the minimum number of colors needed to make G strongly rainbow connected. Let Trn be the generalized triangle-ladder graph for n ≥ 2. The triangle-net graph, denoted by H = (Trn)m, is constructed by taking m homogeneous generalized triangle-ladder graphs and identifying their terminal vertices, for m ≥ 2. This paper determined the rainbow connection number of the triangle-net graph and the upper bound of the strong rainbow connection number of the graph.
Robustness Test of SIMON-32, SPECK-32, and SIMECK-32 Algorithms Using Fixed-Point Attacks
Authors: Susanti B H , Permana O J , Amiruddin
Published: March 2021

SIMON-32 and SPECK-32 are a family of lightweight block ciphers publicly released by the National Security Agency (NSA) in June 2013. Meanwhile, SIMECK-32 is a lightweight block cipher based on the combination of good design components from SIMON- 32 and SPECK-32 block ciphers. In this paper, we tested the robustness of the SIMON-32, SPECK-32, and SIMECK-32 algorithms against fixed-point attacks. Block cipher fixed-points may facilitate fixed-point attacks if an adversary can control the block cipher key input. The results of fixed-point attacks on the SIMON-32, SPECK-32, and SIMECK-32 algorithms show that all three variants of the algorithm have fixed-points.
Metric and edge-metric dimensions of bobble-neighbourhood-corona graphs
Authors: Rinurwati  , Nabila R E
Published: March 2021

Resolving set in a graphG =(V(G), E(G)) is an ordered subset W of V(G) such that every vertex in V(G) has distinct representation with respect to W. Resolving set of G of minimum cardinality is called basis of G.Cardinality of basis of G is called metric dimension of G, dim(G). An ordered set W is called edge resolving set of G if every edge in E(G) has distinct edge-representation with respect to W. Edge-resolving sets in a graph Gof minimum cardinality is called edge-metric basis of G. Cardinality of edge-basis of G is called as edge-metric dimension of G, edim(G). Neighbourhood corona of G and H, G*H, is agraph obtained by taking graph G and |V (G)| graph Hi
with Hi i = 1,2,…, |7(G)| is copy of H, then all vertices in H¡ are connected with neighbouring vertex of vertex v¡ in V (G). In this paper, we determine and analyse metric and edge-metric dimension of bobble-neighbourhood-corona, that is metric and edge-metric dimension of neighbourhood-corona of G and H, G*H, with H is trivial graph K1, and G £ {Cn,Kn}.
The complement metric dimension of particular tree
Authors: Amalia R , Mufidah S A , Yulianto T , Faisol  , Kuzairi
Published: March 2021

Let G be a connected graph with vertex set V(G) and edge set E(G). The distance between vertices u and v in G is denoted by d(u,v), which serves as the shortest path length from u to v. Let W = {whw2,…,wk} ⊆ V(G) be an ordered set, and v is a vertex in G. The representation of v with respect to W is an ordered set k-tuple, r(v|W) = (d(v,w1),d(v,w2),…,d(wk)). The set Wis called a complement resolving set for G if there are two vertices u,v⊆V(G)\W, such that r(u|W)=r(v|W). A complement basis of G is the complement resolving set containing maximum cardinality. The number of vertices in a complement basis of G is called complement metric dimension of G, which is denoted by

dim

¯

(G). In this paper, we examined complement metric dimension of particular tree graphs such as caterpillar graph (Cmn), firecrackers graph (Fmn), and banana tree graph (Bm,n). We got

dim

¯

= m(n+1)-2 for m>1 and n>2,

dim

¯

= m(n+2)-2 for m>1 and n>2, and

dim

¯

= m(n+1)-1 if m>1 and n>2.
The distance 2-resolving domination number of graphs
Authors: Wardani D A R , Utoyo M I , Dafik  , Dliou K
Published: March 2021

The distance 2-resolving dominating set is the combination of two concepts, the resolving set and the distance 2-dominating set. The distance 2-resolving dominating set is a set that is both a distance 2-dominating set and a resolving set. The distance 2-resolving domination number is the minimum cardinality of a distance 2-resolving dominating set, denoted by γल2
(G). In this study, we define the distance 2-resolving dominating sets, and we examine distance 2- resolving domination number of graphs. We give the exact value of the distance 2-resolving domination number of complete graph, star graph, friendship graph and path graph.
On the packing chromatic number of vertex amalgamation of some related tree graph
Authors: Citra S M , Kristiana A I , Adawiyah R , Dafik  , Prihandini R M
Published: March 2021

All graph in this paper is simple graph. Let G = (V, E) where V is nonempty of vertex set of G and E is possibly empty set of unordered pairs of elements of V. The distance from u to v in G is the lenght of a shortest path joining them, denoted by d(u,v). A function c : V (G) → {1,2,…k} is called a k-packing coloring if every c(u) = c(v) = i and d(u, v) > i + 1. The smallest positive integer of k which has packing coloring is packing chromatic number, denoted by χρ. In this paper, we investigated packing chromatic number of vertex amalgamation of some related tree graph, namely broom graph, star graph, path graph and banana graph.
On metric chromatic number of comb product of ladder graph
Authors: Rohmatulloh M Y , Slamin  , Kristiana A I , Dafik  , Alfarisi R
Published: March 2021

All graphs in this paper are connected and nontrivial graph. Let f : V(G) → {1,2,…,k} be a vertex coloring of a graph G where two adjacent vertices may be colored the same color. Consider the color classes Π = {C1, C2,…, Ck}. For a vertex v of G, the representation color of v is the k-vektor r(v | Π) = {d(v, C1),d(v, C
2),…, d(v, C
k)}, where d(v, Ci) = min{ d(v, c); c e Ci}. If r(u | Π) = r(v | Π) for every two adjacent vertices u and v of G, then f is a metric coloring of G. The minimum k for which G has a metric k-coloring is called the metric chromatic number of G and is denoted by μ(G). The metric chromatic number on comb product of ladder graphs namely path graph, star graph, fan graph, cycle graph, and complete graph.
Semiparametric regression based on fourier series for longitudinal data with Weighted Lest Square (WLS) optimization
Authors: Kuzairi  , Miswanto  , Mardianto M F F
Published: March 2021

Regression modelling is one Statistical methods that be used to investigate the relationship between predictor variable and response variable. In regression modelling can be estimated with three approaches, such as parametric, nonparametric and semiparametric regression. In this case, we concentrated to elaborate semiparametric regression. Semiparametric regression consists of parametric and nonparametric component. This research examined semiparametric regression model with Fourier series estimator for longitudinal data. By minimizing Weighted Least Square (WLS), the Fourier series estimator depends on the oscillation parameter. The result is the estimator for parameter and curve regression, that be used to model with real data. The optimal model is selected based on minimum Generalized Cross Validation (GCV) which affects the small value of Mean Square Error (MSE) and high determination coefficient so that the model can be used further as estimation and prediction.
Magnetohydrodynamics fluid flow passing through a sliced magnetic sphere influenced by mixed convection
Authors: Widodo B
Published: March 2021

We consider mathematical modelling of magnetohydrodynamics viscous fluid flow when passing a magnetic sliced sphere in which the effect of mixed convection included. We therefore develop dimensional governing equations from the law of the mass conservation, momentum conservation, and energy equation. The governing equations further are converted into non-dimensional equations by using non-dimensional variables. Further, by using similarity equations in which stream function is included, we obtain non-linear system equation. This non-linear equation is solved numerically by using Keller-Box scheme. We further take numerical computation to analyze velocity and temperature on front of the lower stagnation of the magnetic sliced sphere when various parameters are included, such as Prandtl number, sliced angle, magnetic parameter and mixed convection parameter. We obtain numerical solution that when magnetic parameter increases then profile of fluid velocity decreases but the profile of fluid temperature increases. The mixed convection parameter increases then the velocity profile of the fluid increases but the temperature profile of the fluid decreases. The Prandtl number parameter increases then both of the velocity and temperature profiles of the fluid decreases, respectively. The sliced angle parameter increases then the fluid velocity profile increases but the fluid temperature profile decreases.
Scaffolding for elementary students in solving mathematical problems: a case study
Authors: Dhahir D F , Sulistyarini I
Published: March 2021

Mathematics subject matter does not only emphasize the result of the work but also emphasizes the understanding of the learning process. Previous studies revealed that the failure of students to solve mathematical problems may be caused by the infectivity of the students’ mathematics communication, thus they may need certain scaffoldings, especially in the online distance learning policy during the Covid-19 pandemic outbreaks. This study aims to describe how elementary students require scaffolding in solving mathematics problems. It uses a descriptive qualitative approach. The data were analyzed by using an interactive analysis model. The data were collected by participant-observation and semi-experimental methods. The subjects were four 2 nd to 9 th-grade students who were undergoing online learning from home policy. Their abilities to solve mathematics problems were observed, then scaffoldings were regarded as becoming the appropriate solution. The result indicated that students’ failure in solving mathematics problems began with their failure to understand the questions. Therefore, when communicating mathematics problems, teachers should ensure that students can understand them well. Besides, even if the questions have been delivered afterward, they frequently hampered at the next stages. Therefore, they do need personalized scaffolding in mathematics. It must correspond to each of their prior knowledge and skills, and be prepared in a clear step-by-step manner.
Mathematical collaborative learning in 21 st century based on national science olympiad in junior high school
Authors: Sutama  , Narimo S , Prayitno H J , Anif S , Sari D P
Published: March 2021

Learning in 21 st century is no longer interpreted as process of transfer of knowledge from teachers to students, but rather emphasizes the efforts of teachers to facilitate students in constructing concepts and solving problems independently. The purpose of this study was to describe mathematical collaborative learning in 21 st century. It was qualitative research. The research was conducted at SMP Negeri 1 Colomadu Karanganyar in 2019/2020 academic year. The research instruments included lesson plans, problem solving tasks, and observation sheets. Data validity used time triangulation. Data analyses were done through data collection, data reduction, data presentation, and drawing conclusion. Based on results, 1) The ability of critical thinking: students were skilled in concluding discussion result that had been carried out with logical assumptions and were able to determine the right actions to solve the problems; 2) The ability of creativity: students were skilled at formulating complex problem solving strategies; 3) The ability of collaboration: there was a positive dependence among students so that an academic support system was embodied, in which each group member was commited to achieve mutual success; 4) The ability of communication: there was dynamic interaction between group members and teachers, so that learning occurs effectively.
The preliminary study of students’ creative problem-solving ability
Authors: Sipayung T N , Imelda  , Siswono T Y E , Masriyah
Published: March 2021

Mathematics helps students to practice their thinking skills. One of the thinking skills expected to face the times is the ability to think creatively. Therefor we need a qualitative research with descriptive methods. The research that was conducted at SMP Santo Yoseph Medan in the academic year 2020/2021 involved 16 students representing class VII-B and 14 students representing VII-C junior high schools as research subjects and the results showed that students’ creative problem-solving abilities did not show good results. The instrument used was a test of creative problem-solving abilities which consisted of 3 questions. This is analyzed based on the indicators of fluency, flexibility, and originality for solving questions number 1, 2, and 3. Based on the fluency indicator in solving problem number 1, data is obtained that 14 people are not fluent and 16 people are fluent. In solving problem number 2, data is obtained that 15 people are not fluent and 15 people are fluent. In solving problem number 3, it is obtained data that 18 people are not fluent and 12 people are fluent. Based on the indicator of flexibility in solving problem number 1, it is obtained data that 29 people are not flexible and 1 person is less flexible. In solving problem number 2, it is obtained data that 30 people are not flexible and none are flexible. In solving problem number 3, it is obtained data that 30 people are not flexible and none are flexible. Based on the originality indicator in solving problem number 1, it is obtained data that 29 are not new and 1 person is not new. In solving problem number 2, data shows that 27 are not new and 3 are not new. In solving problem number 3, it is obtained data that 27 people are not new and 3 people are not new.
On the implementation of project-based learning to improve the students creative thinking skills in solving rainbow antimagic coloring problems
Authors: Budi H S , Dafik  , Tirta I M
Published: March 2021

This study was intended to know the implementation of project-based learning to improve creative thinking skills of students in solving rainbow anti-magic coloring problems. The methods used in this study were a combination of quantitative and qualitative methods. The quantitative method was used for the statistical analysis of test, while the qualitative method was used to analyse data that are related to the results of the test on each indicator and the results of phase portraits. This research used two classes, experimental and control, in which each class consisted of 26 students as respondents. Both classes were given treatments with different type of learning model. In the experimental class, the learning instruments that have been developed was applied along with a project-based learning method, while in the control class only used project based learning. The results of creative thinking skills of the students for control class indicated that 53% of students were categorized as low, 37% of students were categorized as medium, and 10% of students were high-level creative thinking skill while in the experimental class 34% of students were low, 44% of students were medium, and 22% of students were high-level creative thinking skill. The homogeneity test result of two classes, using a pre-test result, showed p–value of 0.701 > 0.05; therefore, the mean difference between classes was not significant. The inferential statistical result of the independent sample t-test on the post-test showed p–value 0.0053 (p < 0.05), which was significant. It can be concluded that project-based learning has a significant effect for improving creative thinking skills of the students in solving rainbow anti-magic coloring.
The analysis of students’ creative-innovative thinking skills in solving total dominator coloring under the implementation of research-based learning model
Authors: Lazuardi A R , Slamin  , Dafik
Published: March 2021

Thinking skills are very important in all aspects of life, especially education. In the era of 21st century skills, creative innovative thinking skills, play a serious role in improving students’ life skills. This study aims to determine the application of research based learning (RBL) in improving students’ creative innovative thinking skills in solving the total dominator coloring. Mixed methods is the research method used in this study. The research subjects consisted of two classes, namely 24 students in the control class and 21 students in the experimental class. The two classes were given a different treatment. Control class using PBL model and experimental class using RBL student worksheets. Homogenity test results on problems pre-test showed a significance value of 0.067 > 0.05, which means that the two classes are homogeneous. The results of the independent sample t-test showed the results of 0.000 < 0.05, which means significant. The conclusion obtained from this study is that there is an increase in students’ creative innovative thinking skills after the application of research-based learning models in solving total dominator coloring problems.
The analysis of the implementation of problem-based learning students’ generalization skills in obtaining the resolving total domination number
Authors: Ervani R S R , Dafik  , Tirta I M
Published: March 2021

Problem Based Learning (PBL) is a way to form and teach using problems as a stimulus and focus for student activities. Student generalization skills are one of the skills that can be improved using PBL. Mathematical generalization is a competency achieved by students, which includes general perception (identificationing pattern), general expression (describing patterns), generality symbolic expression (formulating patterns), generality manipulation (using generalization results). This research was conducted to see the effect of PBL instrument development on students’ ability to solve problems solving the total dominating set. The study used a mixed method, combining quantitative and qualitative methods. The research subjects consisted of two classes each with n = 24 for control class, and n = 23 for experimental class. In the control class and the experimental class PBL model is used, but only in the experimental class applied the student worksheet. The homogeneity test of the pre-test results for both classes showed a p-value of 0.2199 (p > 0.05), so that the average difference between the two classes was not significant (homogeneous). Based on the independent t-test on the post test scores of the two classes, the p- value was 0.01682 (p < 0.05), so it can be concluded that there is an effect of PBL instrument application on students’ generalization skills.
Scientific communication skills on mechanical wave concept using student facilitator and explaining model assisted schoology
Authors: Hakim L , Alatas F
Published: March 2021

This research aims to find out the improvement and achievement of students’ scientific communication skills on the concept of mechanical waves using a cooperative model of student facilitator type and explaining assisted schoology. The research was conducted in the 2019/2020 school year in Man 2 Bekasi City. The sample taken was XI MIPA 3 as many as 34 students. The research method used pre experiment with the research design of the one group pre-test post-test design, sampling technique using purposive sampling. The instrument used is a test instrument in the form of an essay question as many as 9 questions and a non-test instrument to see the scientific communication of students at each meeting. The N-gain results, on the scientific communication skills (SCS) of students to find back relevant information from sources that have been read have the greatest increase. Then, based on the non-test results, it was found that the achievement of students’ scientific communication skills had increased in communicating reports orally (presentations).
Improving students' mathematical inductive reasoning ability through reflective learning Model
Authors: Kurniawati L , Miftah R , Indriani R
Published: March 2021

Mathematical inductive reasoning ability is one of the higher-order thinking skills that students must have. Mathematical inductive reasoning includes the process of drawing to conclude, estimating answers or solutions, and providing explanations of existing models, facts, properties, relationships, or patterns. This research aims to analyze mathematical inductive reasoning ability between students who received a reflective learning model and those who received conventional learning. The research was conducted at one of the senior high school in Tangerang Selatan. The method used in this research is a quasi-experimental method with Randomized Subjects Post-test Only Control Group Design. The instrument used was a mathematical inductive reasoning ability test. The research results based on the analysis using t-test showed that the students’ mathematical inductive reasoning ability who are taught by reflective learning model higher than students taught by the conventional model. This matter visible from the mean score of the results tests students’ mathematical inductive reasoning who taught with reflective learning model is 75,50 and who taught with a conventional model is 67,68. In conclusion, this research results that mathematics learning with a reflective learning model can improve the students’ mathematical inductive reasoning ability better than using conventional learning models.
Improving students’ mathematical creative reasoning on polyhedron through concept-based inquiry model
Authors: Dwirahayu G , Mas’ud A , Satriawati G , Atiqoh K S N , Dewi S
Published: March 2021

Mathematical reasoning is defined as an activity of mathematical thinking to produce statements or conclusions based on existing facts. Mathematical reasoning is divided into creative reasoning and imitative reasoning. According to constructivism theory, the idea in mathematics should be built by students, therefore mathematics become logic, meaningful, and real. One of the constructivist learning models that facilitate students to actively discover their own concepts is CBI model. The study aims to know the effectiveness of the CBI model on teaching mathematics toward improving MCR. The research is conducted in the year 2019/2020 at junior high school one in Citeureup-Bogor. Two classes, as the sample of the research, the first class as experiment class,and the second class as control class, both of them consists of 36 students. The instrument used to identify students’ MCR abilities was an essay test on the polyhedron material. By using t-test analysis at a significant level of 5%, we obtained the Sig. (2-tailed) the value obtained was 0.018. Therefore, Sig. (2-tailed) = 0.018 < α = 0.05. It means that students’ MCR taught by CBI model is higher than students’ MCR who taught with conventional learning models.
NgaBatik: Application Interactive Games to Learn About Design Batik Ngawi Based Android Through The Application of STEAM Learning Model
Authors: Febriansari Devie , Atmojo Idam Ragil Widianto , Ardiansyah Roy , Januardy Sargian
Published: March 2021

Batik is one of the cultural heritages that have been established by UNESCO as a Cultural Heritage Humanity’s Oral and Non-material (Masterpieces of the Oral and Intangible Heritage of Humanity) since October 2009. Art Batik is the art over the cloths to clothe the beginning only used by the family empires only. The advancement of science in the field of information and communication technology, especially the use of handheld devices Android smartphone has changed the perspective and lifestyle in carrying out daily activities. This impacted on the traditional arts activities. The less the interest of the public to learn or just know about the background of this application that combines the advancement of science in the field of technology to load content such as batik, especially in Ngawi Regency so that people can preserve it.. This application is made into a games interactive education format mockup use software Marvell and is designed to run on devices with operating systems Android and if the teacher want to explain with the students, the teachers can use STEAM learning model.
Virtual Reality and Educational Game to Learn Madurese History and Alphabet For Elementary School Students
Authors: Ramansyah Wanda , Aini Nuru , Fitriansyah Wisno , Pratama M Dimas
Published: March 2021

This development research aims to develop a learning media that collaborates virtual reality and educational game to learn Madurese history and alphabet. This learning media was created to facilitate the difficulties of 3rd grade students of Pangarangan III Elementary School of Sumenep in learning Madurese history and alphabet. This learning media is developed based on information technology that can bring students to an environment that seems real. This media also supports distance learning which is suitable for students to use in learning during the current Covid-19 pandemic. The development of this learning media uses ADDIE Model. The learning media that has been created are then tested with results of trials on media design experts is 91% (very high), trials on material or content experts are 84% (high), trials on individual users (three students) are 85% (high), testing trials in small group users (six students) was 87% (high), and trials in large group users (twenty students) was 86% (high). It can be concluded that the virtual reality and educational games are well worth it and no need to revise. The application of this media in learning will have an impact on increasing the effectiveness, efficiency and attractiveness of learning Madura history and alphabet.
Students’ Perceptions of Using Microsoft Teams Application in Online Learning During the Covid-19 Pandemic
Authors: Wea Kristiana Nathalia , Dua Kuki Agustina
Published: March 2021

The spread of COVID-19 has an impact on changing the learning process at the Faculty of Teacher Training and Education (FKIP) Nusa Nipa University (UNIPA). UNIPA chose to implement online learning using Microsoft Teams. This study aims to determine the FKIP students’ perceptions on the use of Microsoft Teams application in online learning during the COVID-19 pandemic. The sample of this research was 176 FKIP students’ which were spread in 5 study programs. They are Physics Education, Chemistry Education, Biology Education, and Elementary School Teacher Education. This research is qualitative research with data collection techniques were questionnaire and analyzed using Likert scale. The results showed that FKIP UNIPA students had a good perception of using Microsoft Teams. Students hope that this application will continue to be used during online learning with some improvements so that learning using this application can take place more effectively and efficiently.
Developing instrument to measure entrepreneur skills of vocational school students based on sustainable development
Authors: Dalyanto A , Sajidan  , Siswandari  , Sukarmin
Published: March 2021

Entrepreneurial activities require a variety of skills. Instruments that measure the entrepreneurial skills of vocational school students are still very limited. This article aims to develop and validate instruments in measuring the entrepreneurial skills of vocational school students based on sustainable development. The research population was vocational school students in Klaten. Stratified cluster random sampling is used for sampling. The research method used is a quantitative method with an explanatory type of study that is directed to analyze and produce an instrument for assessing entrepreneurial skills. The item analysis to determine the criteria of internal consistency used Pearson Product Moment regarding data collected from one hundred and sixty students. The reliability of the instrument was determined using Cronbach’s alpha coefficient. The criteria of internal consistency from each component is relatively high. The lowest average degree is 0.556 in the component view of independence, and the highest average level is 0.605 in the seeing opportunities component. The Cronbach’s alpha coefficient for the reliability test was 0.622 in the learning orientation component as the lowest degree and 0.819 in the result-oriented component as the highest degree. The results revealed that the entrepreneurial skills instrument is a valid and reliable tool for assessing the entrepreneurial skills of vocational school students.
Identification of Multiple Representation Abilities Using C3TMC Instrument: Needs Analysis in Chemistry Learning
Authors: Faradilla P H , Sri Y , Sulistyo S
Published: March 2021

Chemistry learning plays a significant role in producing pupils whom both mastered the cognitive aspect and multiple representative aspects (contextual learning). Evaluation instrument used by the teacher for measuring cognitive aspect is common, but those for measuring multiple representation ability is rare. The proper instrument is needed to measure multiple representations. This study aims to describe the analysis of the needs of the Computerized Three-Tier Multiple choice (C3TMC) Instrument to measure student’s multiple representational abilities in chemistry learning. Qualitative descriptive is the research method chosen by conducting a qualitative survey. The sampling technique was purposive sampling. The participants consisted of 17 chemistry teachers in the Surakarta area. This research used 13 items of the survey that aimed to reveal teachers’ needs on the learning evaluation process had been validated by two experts. The results obtained show that the analysis of computerized and needed an assessment instrument that was able to measure students’ multiple representational abilities has a high utilization category in chemistry learning, namely 88.2%. By considering the results, the teachers tremendously need a good instrument to measure pupils’ multiple representation abilities in Chemistry learning.
Mixture Model Nonparametric Regression and Its Application
Authors: Adrianingsih Narita Yuri , Budiantara I Nyoman , Purnomo Jerry Dwi Trijoyo
Published: March 2021

Regression analysis is a statistical analysis used to determine the pattern of relationships between predictor variables and response variables. There are two models of estimation approaches in regression analysis, namely parametric regression, and nonparametric regression. The parametric regression approach is used in the shape of the regression curve is known. In cases with unknown relationship patterns, the development is done using nonparametric regression. Nonparametric regression is a model estimation method which is based on an approach that is not bound by certain assumptions of the regression curve shape. Nonparametric regression varies greatly with variable curves that are different between one predictor variable with another predictor variable. In nonparametric regression, there are several types of the recommended kernel, spline, and Fourier series. In many cases, however, these conservative nonparametric regression methods cannot handle more complex problems. Mixture methods by combining several methods such as a mixture of spline and Fourier series, kernel and Fourier series, and so on, give a better result. This study aims to obtain estimates of a mixture of a truncated spline, kernel, and Fourier series by using the Ordinary Least Square (OLS) method and obtain methods for selecting knots, bandwidth, and optimal oscillation parameters with the smallest GCV. The results of this study are the formulation of a mixed estimation model of the truncated spline, kernel, and Fourier series and the smallest GCV formula to obtain the optimum location and number of points of knots, bandwidth, and oscillations.
Promoting Scientific Literacy in Chemistry Learning on the Subject Colloid through Instructional Material Development
Authors: Hatta  , Miterianifa  , Octarya Zona
Published: March 2021

Students’ scientific literacy skills are still low because they are still minimal or not the availability of chemistry teaching materials that contain balanced scientific literacy skills. The research objective was to develop scientific literacy-based chemistry teaching materials that contain balanced scientific literacy, validity, readability, and effectiveness. This research conducted research and development methods with the ADDIE approach which consists of five steps; analyze, design, develop, implement, and evaluation. Based on the research results, the teaching materials were based on science literacy colloid material which developed has the characteristics of a balanced scientific literacy content, namely 41,17% of science as the body of knowledge, 17,64% of science as a way of investigating, 17,64% science as a way of thinking, and 23,52% interaction of science, technology, and society. 7 validators of scientific literacy-oriented teaching materials were declared feasible and have criteria easy to understand with average readability of 74.11%. An increase in scientific literacy skills students who use science literacy-based teaching materials is higher than students who using teaching materials used in school.
The Removal of Methylene Blue and Congo Red Dyes from Aqueous Solution by Using Sulfonated Carbon Derived Fishbone
Authors: Nurhadi M. , Kusumawardani R. , Rindoi M. , Apriliani A. D. , Khair A. F. , Noor A. , Lumbantobing T. P.
Published: March 2021

In the world, the dyes pollutant from industrial activity is big issue that must be sought the solution. Among of dyes pollutants were methylene blue (MB) and congo red (CR). In this research have been conducted the removal of methylene blue and congo red onto sulfonated carbon derived fishbone (SCFB) as adsorbent from aqueous solution. The preparation steps of SCFB adsorbent involved the sulfonation (H2SO4; 1M) of fishbone powder for 6 h, by stirrer at room temperature, and followed by carbonization at 500 °C for 2 h. The physical properties of the adsorbents were characterized using Fourier Transform Infrared, X-Ray Diffraction (XRD), and nitrogen adsorption-desorption studies. The dye removal study using SCFB adsorbent was carried out by varying contact time and initial dye concentration. The kinetics models were determined by the effects of contact time. The adsorption isotherms were tested to isotherm Langmuir and Freundlich with a base on the effect of initial dye concentration. The result showed that The removal of MB and CR dyes using SCFB adsorbent fitted a pseudo-second-order kinetic models. The maximum dye removal capacity of SCFB was 128.2 mg g−1 for CR and 35.7 mg g− 1 for MB. Base on the maximum dye removal capacity, the SCFB can be considered as good adsorbent to remove dyes pollutant from environment.
The Generic Science Skill Profile of High School on Theory Momentum And Impulse
Authors: Sakliressy M T , Sunarno W , Nurosyid F
Published: March 2021

So many jobs today require high-level skills, logical thinking, creative thinking, generic and scientific processes, being able to solve problems, and make decisions. These skills are one of the main goals of 21st-century learning. Based on the results of a survey by TIMSS (Third International in Mathematics and Science Study) students in Indonesia in the field of science are ranked 38 out of 40 countries. This study aims to describe the generic science skill profile of YPPK Teruna Bakti high school students class XI on momentum and impulse. The method used in this research is descriptive quantitative. Data were collected through a test method in the form of multiple-choice questions based on three of the nine generic science skills indicators according to Brotosiswoyo. The test was conducted on 35 students. The test results showed that the overall average level of mastery was 55.7%. Generic science skills per indicator, for direct observation indicators 59.5%, concept building indicators 55.7%, logical consistency indicators 51.4%. The overall average for the concept of momentum and impulse is 60%, the concept of momentum-impulse relationship and the law of conservation of momentum is 52%, and the concept of collision and application impulse-momentum is 55%.
Maxwell Klein-Gordon System with General Gauge Coupling on 4-Dimensional Flat Spacetime
Authors: Mulyanto  , Akbar Fiki T , Gunara Bobby E
Published: March 2021

In this paper, we study the Maxwell Klein Gordon system (MKG) with the addition of general gauge couplings on four-dimensional Minkowski space. This system analyzes the interaction of the electromagnetic field (photon) coupled with the complex scalar field (spin-0 particles). This research considers the multi-field interactions by adding general coupling. Our method begins from the Lagrangian of Maxwell Klein Gordon equation with potential turn on. We derive the energy of the system, then write the equation of motion in the form of a non-linear partial differential equation. By using the spherical means method, we express the solutions in an integral form of its curvature. Then, by using temporal gauge condition and conservation of energy, we prove the inequality for some general coupling. The result shows that the first and the second derivative of it bounded by the energy and IL norm. This result will become the main key to proving the global existence of Maxwell Klein-Gordon’s theory.
The Effect of Teacher Candidates’ Science Process Skill on Analytical Chemistry Through Guided Inquiry Learning Model
Authors: Juniar Anna , Silalahi Albinus , Suyanti Retno Dwi
Published: March 2021

This study was purposed to find out is there any significant difference of guided inquiry and conventional learning model implementation towards Analytical Chemistry practicum courses, particularly on Redox, Argentometry and Complexometry titrations. This study also analyzed the effect of the learning model through quasi-experimental method. There were 28 teacher candidates in experimental class which taught by using guided inquiry (GI) learning model and 23 teacher candidates in control class which taught by using conventional learning model. Based on Mann-Whitney test, p-values for Redox, Argentometry and Complexometry practicum courses were 0.001, 0.012, 0.030 respectively. Since p-values were less than 0.05 then Ha is accepted which means teacher candidates’ science process skill in experimental class is different significantly compared to control class. The effect of model was calculated through N-gain which score 81%, 76% and 80% in experimental class and 55%, 57% and 59% in control class for respective practicum. This means the teacher candidates’ science process skill is better in experimental class (taught by using GI model) than control class (taught by using conventional model). These findings give contribution to chemistry education especially for improving chemistry teacher candidates’ quality and reducing them who often feel difficult to learn Analytical Chemistry.
Students’ Creative Thinking Skills of Learning Cell Metabolism Using Stim-Hots Model
Authors: Sukmawati A , Sajidan  , Harlita
Published: March 2021

Creative thinking skills are high-level thinking skills that have a large impact on the progress of students in particular. The importance of creative thinking skills is a major concern for training it to students. This study aims to train students’ creative thinking skills on the material in cell metabolism by using modules based on stimulating higher order thinking skills (Stim-HOTs). This research uses quantitative descriptive methods. The instrument used was a creative thinking test instrument on cell metabolic material that had been integrated with aspects of creative thinking. The research subjects were 64 students of 12th grade high school in Surakarta including 32 control class students and 32 module class students. The results showed that the creative thinking skills of students who were trained using modules based on stimulating higher order thinking skills on metabolic material had increased. It showed in the eksperimen class, namely in the aspects of fluency 70,31, originality 71,48, and flexibility 62,5 are at the high category level.
Meta-Analysis of The Effectiveness of Problem-Based Learning Towards Critical Thinking Skills in Science Learning
Authors: Luvia Ranggi Nastiti , Yokhebed  , Ramli Murni , Yuliani Hadma
Published: March 2021

In 21st century learning, students are required to be able to face the world of work that requires the ability, one of them is critical thinking. The objective of this meta-analysis is to estimate the effectiveness of problem-based learning on critical thinking skills. This meta-analysis research method consists of some steps, they are research problem, data collection (study), data coding, data analysis, and interpretation. Based on the journal research, it is found 17 critical thinking skills journals, 17 articles that fulfill the criteria: an empirical study on problem-based learning in college and secondary education conducted in classrooms. This explanation revealed that there is a strong positive effect of Problem-based Learning on critical thinking skills. The findings of the research revealed that the results of the meta-analysis were obtained an effect size of the influence of Problem-based Learning on the dependent variable of critical thinking skills of 3,1 which is classified as high where the influence of Problem-based Learning on the dependent variable of critical thinking skills is 99.9%.