bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of virgin coconut oil (VCO) components after heating and adding Cymbopogon nardus as the essential oil
Authors: Suaniti N M , Adnyana I W B , Manurung M 
Published: November 2019

AbstractCymbopogon nardushas the potential to be an essential oil, used for kitchen spice, cosmetics (aromatherapy), and cancer medicines which contains citrate, eugenol, citronellol, citronellal, geraniol, citronellyl acetate, geranyl acetate, beta-caryophyllene, limonene, and methyl eugenol. This study aimed to analyze the components of Virgin Coconut Oil (VCO) after heating and addingCymbopogon narduscompared to commercial products. The method of making coconut oil was enzymatic and heated for about ten minutes. Analysis of VCO components after being heated and added citronella was carried out by using ultimate size difference, microscopic analysis, and Gas Chromatography-Mass Spectrometry compared with the commercial VCO product. The results showed that there was an intensity change in the similarity of ion fragments as well as microscopically and carbon content of more than 70%, hydrogen 10%. Separation of VCO components resulted in good separation among ethyl esters such as ethyl caprylate, ethyl laurate, and ethyl myristate detected for 30 minutes by gas chromatography and fragment ion similarity in mass spectrometry. Chemical components in commercial oils were lauric acid, ethyl laurate, glycerol tricaprylate, and vinyl decanoate.
Optimization of condition extraction in quantification of total flavonoid content in the seeds of the Arummanis (Mangifera indica L.) mango from Indonesia
Authors: Masturi  , Alighiri D , Nuzulina K , Rodhiyah M , Drastisianti A 
Published: November 2019

Abstract
Mangoes are an abundant local fruit. Mango seed is a biowaste material that only becomes an environmental problem. Therefore, a study was conducted to utilize one of the compounds contained in mango seeds particularly the seeds of the Arummanis (Mangifera indica L.) from Indonesia, namely flavonoids. One of the most optimum methods is used for extraction with a variety of solvents, namely ethanol, methanol, and hexane. Determination of total flavonoid content is based on the AlCl3 method with total flavonoids content expressed in QE (Quercetin equivalent) at a maximum wavelength of 425 nm. The results showed that the most optimal total flavonoid content was from ethanol extract with the reflux method of 3.234 mg QE/g extract.
The analysis of teacher’s ability in create lesson plans and student worksheet
Authors: Haryani S , Wardani S , Supardi K I , Prasetya A T 
Published: November 2019

Abstract
The purpose of this study was to analyzed the ability of teachers in designing the lesson plan and student worksheet based on learning models of Curriculum 2013. A total of 8 people as subjects in this qualitative descriptive research. The ability to design lesson plans and student’s worksheet which prepared by subjects was analyzed using a particular assesment rubric. The performance of lesson plans preparation was generally weak in terms of writing preliminary and learning activities. The ability of give apperception in terms of connecting between the pre-requisite and the material to be studied was less attention. In the case of the writing of learning activities in student’s worksheet, 4 out of 8 subjects choosed discovery learning. The stimulus provided in worksheet still lacks opportunities for students to identify problems. PBL and PJBL models were selected by the rest of the subjects. The results were also not appropriate for writing for a student-oriented phase on issues for PBL and fundamental questions for PJBL. Another weakness was the ability to give students opportunities to construct their own knowledge through connecting observation data, video observation, or discussion activities. Some things that have been considered were the integration of character education development and literacy reading. Higher-order thinking (HOTs) still needs to be improved. In addition, the ability to understand the vastness and depth of the material, and learning strategies need to be improved better so that students were able to construct their knowledge.
An analysis of students conceptual understanding of submicroscopic level in solubility and solubility product constant (Ksp) using three-tier multiple choice test
Authors: Susilaningsih E , Alawiyah N , Sulistyaningsih T , Nada E I , Drastisianti A 
Published: November 2019

Abstract
This research aims to know the student’s conceptual understanding of the submicroscopic level using a three-tier multiple choice test with the help of multiple representation’s teaching material. This research used mix method with sequential explanatory strategies, and the research subject was students of Islamic senior high school (MA) Riyadlotut Thalabah, Rembang, Central Java, Indonesia which consists of the class of XI IPA 1, XI IPA 2, and XI IPA 3. The data collection technique used three-tier multiple choice test that most questions focus on the submicroscopic level. The result shows that the percentage of students’ Conceptual Understanding of Particulate Level on Solubility and Solubility Product Constant (Ksp) material was 15,14% for Scientific Knowledge(understand)category, misconception type 1 was 7,99%, misconception type 2 was 0,97%, misconception type 3 was 21,55%, lack of knowledge type 1 was 5,06 %, lack of knowledge type 2 was 0,36%, lack of knowledge type 3 was 46,03%, and for lucky guess was 2,86%.
Profile of students critical thinking skills on redox concept in SMA Negeri 8 Semarang
Authors: Dewi R K , Wardani S , Wijayati N 
Published: November 2019

Abstract
The following study was carried out as a preliminary investigation of students’ critical thinking skills after a learning process in redox reaction matter. The subject of this research was 36 students of science class grade XI school year 2018/2019 in SMA Negeri 8 Semarang. The data analysis technique in this research was done by calculation of the questionnaire results of students’ responses to the questions on redox material. Methods of data collection were done by observation, documentation, teacher interview, and student interview. The instruments of this study consisted of observation sheets, questionnaires, and interview sheets. The results showed that students’ critical thinking skills in redox material concept after learning process included in the category was low achievement. In advanced, we will develop efforts to improve students’ critical thinking skills at SMA Negeri 8 Semarang that will be done by applying creative learning models and use of learning media.
Analysis of student concept understanding on the material of buffer solution using three-tier test assisted by multiple representation teaching materials
Authors: Drastisianti A , Susilaningsih E , Wijayati N , Nada E I , Alawiyah N , Supartono  
Published: November 2019

Abstract
This research is a mix method research with the design of sequential explanatory strategy. This research aims to know and describe students’ conceptual understanding of buffer solution material and to get student response to teaching material of multiple representation buffers (macroscopic, submicroscopic, and symbolic). Research subjects were 114 students from eleven grade of natural science class (XI MIPA 3, XI MIPA 4, and XI MIPA 5), state senior high school 12 (SMA Negeri 12) Semarang, Indonesia, academic year 2017/2018. Quantitative data was collected through a diagnostic test in the form of three-tier multiple choice test totaling 20 items and questionnaires to find out the student’s response to multiple representation of teaching materials. Qualitative data is obtained by interview to confirm student answers. Multiple representation materials validated by three validators and received very excellent results with an average score of 190.33 from 212. The average score of the questionnaire was 30.026 with a proper category, and Alpha Cronbach reliability was 0.884. The results of this study indicate that the understanding of the concept of students on the material of buffer solution as much as 47.061% understand, 29.868% less understood, 12.763% misconception, and 10.307% do not understand.
A modified economic order quantity of vendor – buyer non-cooperative supply chain model for imperfect quantity and inspection error using the nash equilibrium concept
Authors: Setiawan R , Chrisnawati H E , Kuswardi Y 
Published: November 2019

Abstract
In this paper, the Economic Order Quantity (EOQ) of two-level supply-chain systems has been analyzed using the Nash Equilibrium concept. In this paper, a two-echelon supply chain consisting of a single vendor and a single buyer that both under the non-cooperative strategy. A mathematical analysis method, which according to appropriate literature, data and recent research result, is used to determine the mathematical formula of expected individual total cost both vendor and buyer, expected total cost of inventory system and also EOQ of decision variables. The non-cooperative strategy is used by the vendor and buyer to gain their optimal revenue. Thereby, game theoretical solution which is Nash equilibrium concept is used to determine the economic order quantity of this system. In this study, several assumptions are considered like the existence of the imperfect quality product in the manufacturing process and inspection error (Type I and Type II) in buyer’s place. To the best of authors’knowledge, this is the first paper that deals with a game theoretical solution, which is especially Nash equilibrium, in probabilistic supply chain under the imperfect condition and inspection error
Customer satisfaction analysis based on service quality: case of local credit provider in Bali
Authors: Suciptawati N L P , Paramita N L P S P , Aristayasa I P 
Published: November 2019

Abstract

Lembaga Perkreditan Desa (LPD) or village credit institution is a financial institution that is only exists in Bali. LPDs had been developed to promote the local people economies by providing micro credits as well as to deposit their money. This paper is aimed to study the satisfaction of customers toward LPD’s services. A hundred and fifty customers of LPD Sidakarya that is located at Denpasar were purposive sampling selected as the respondents of the study on July 2017. The data were collected by applying self-organized questionnairé which its items were developed using 7 scale on Likerts’ measurement. The respondents were asked to value their expectation as well as their perception on five dimension of service quality i.e. tangible factor, reliability, responsiveness, assurance, and empathy. The study reveals tangible factor was perceived positively whilest the other determinants need to be improved.
Development of 3CM (cool-critical-creative-meaningful) learning model to increase creative thinking skill
Authors: Wahyudi  , Waluya S B , Suyitno H , Isnarto  
Published: November 2019

Abstract
This research aims to develop a 3CM learning model to support student to improve their creative thinking skills. The method used in this research was R&D with ASSURE development model consisting of six stages: 1) analyze learners, 2) state objectives, 3) select method, media, and materials, 4) utilize media and materials, 5) require learner participation, 6) evaluated and revise. The participants in the research is pre-service primary teacher students. Product validation was done through an expert’s assessment by using the expert’s validation sheet. The practicality of the product is tested with limited trials with college lecturers and some students with questionnaires and interviews. Product effectiveness was seen by implementing limited development testing to a particular class with a group pretest-posttest design and the result was analyzed by using a Paired-Samples T-Test. The result of this research is a 3CM learning model to support students’ to improve their creative thinking skills. The validity and practical of the learning model was proven by the result of the expert assessment in learning and limited test by peers and students in small group, material and instructional media. The effectiveness of the learning model was also proven based on Paired-Samples T-Test of students’ pretest and posttest.
Hierarchical Bayesian segmentation for piecewise stationary autoregressive model based on reversible jump MCMC
Authors: Suparman  
Published: November 2019

Abstract
This paper aims to decompose time series data in segments where many segments are unknown. The data in each segment is modeled as a stationary autoregressive where the model order is unknown. The model parameters include the number of segments, the location of segment changes, the order of each segment, and the autoregressive coefficients of each segment. The Bayesian method is used to estimate parameters, but Bayesian estimator cannot be calculated analytically. The Bayesian estimator is calculated using the reversible jump Markov chain Monte Carlo algorithm. The performance of the algorithm is tested using synthesis data. The simulation results show that the algorithm estimates the model parameters well.
Spectral theory for self-adjoint linear relation (SALR) on a Hilbert space and its application in homogenous abstract cauchy problem
Authors: Hariyanto S , Sari R K , Farikhin  , Sumanto Y D , Solikhin  , Aziz A 
Published: November 2019

Abstract
A spectral theory studies eigenvalues and eigenvectors of SALR on H. SALR on Hilbert space H is a linear relation satisfying A = A*. Many applications of SALR on quantum theory, such as the homogenous abstract Cauchy problem.If M is an operator that has an inverse then eigenvalues and eigenvectors are easily determined, but If M is an operator that does not have an inverse then eigenvalues and eigenvectors are quite difficult determined. One way that can be done is to use a linear relation. Furthermore, there are some properties of spectral theoryof linear operator that can not apply to SALR. This paper aims to give a spectral theory for SALR and its application in a homogenous abstract Cauchy problem.
Modified Stojkovic-Stanimirovic method to find redundant constrains in linear programming problems
Authors: Estiningsih Y , Farikhin  , Tjahjana R H 
Published: November 2019

Abstract
Important techniques in linear programming are modeling and solving practical optimization. A redundant constraint is a constraint that can be remove from a system of linear constraints without changing the feasible region. Method for identifying redundant constraints which in the process only uses the objective function and inequality constraints, i.e., Stojkovic-Stanimirovic method. In this paper we give a modified method of Stojkovic-Stanimirovic method to detect redundant constraints in linear programming problems. The advantages of employing the propose method is still to use the different objective function on linear programming associated the same feasible set have the same result. To clarify these method is given an example cannot be solve using detect Stojkovic-Stanimirovic method but can be solve using propose method.
Increasing number of clusters on fuzzy time series (fts) forecasting method
Authors: Ningrum R W , Surarso B , Farikhin  
Published: November 2019

Abstract
Determining the effective number of clusters can influence forecasting results in FTS method’s applications. Unfortunately, the issue of how many clusters should be used to improve forecasting results has not been touched in previous researches. We observe for some different number of clusters and compare its Root Mean Squared Errors (RMSEs) results. The numerical simulation using Jakarta Composite Index (IHSG) data and the forecasting results show that RMSEs value decrease when the number of clusters is increased. The RMSEs value drops significantly when n = 50 clusters are used.
Ant colony system algorithm for generalized trapezoidal fuzzy capacitated vehicle routing problem
Authors: Kusumawati R , Sahid  , Lestari A D 
Published: November 2019

Abstract
Traffic congestion causes late arrivals at customers and long travel times resulting in large transport costs. Traffic congestion also can result in the travel time of the vehicle from one place to another cannot be determined precisely even though the distance travelled is the same. In this paper, fuzzy capacitated vehicle routing problem (FCVRP) with travel time expressed by generalized trapezoidal fuzzy numbers is addressed. The fuzzy model is reduced to corresponding crisp one using fuzzy ranking method. Then, we propose ant colony system (ACS) algorithm with the status transition rule, global pheromone trail update and local pheromone trail update for constructing the optimal vehicle routes of the reduced problem. A numerical example of Bright gas 5.5 kg distribution is demonstrated to find the optimal solution of the proposed method. Travel time are obtained basing on real data measured by an electronic system at ten different times. The proposed method is simpler and more computationally efficient when compared to existing methods.
Model selection in regression linear: a simulation based on akaike’s information criterion
Authors: Darnius O , Normalina  , Manurung A 
Published: November 2019

Abstract
Akaike’s Information Criterion (AIC) was firstly annunced by Akaike in 1971. In linear regression modelling, AIC is proposed as a model selection criterion since it estimates the quality of each model relative to other models. In this paper we domonstrate the use of AIC criterion to estimate p, the number of selected varibles in regression linear model through a simulation study. We simulate two particular cases, namely orthogonal and non - orthogonal cases. The orthogonal case is run where there is totally no correlation between any independent variable and one dependent variable, whereas for the the orthogonal case is run where there is a correlation between some independent variables and one dependent variable. The simulation results are used to investigate of the overestimate number of independent variables selected in the model for two cases. Although the two cases produce the oversetimate number ofindependent variables, most of the time the orthogonal case still provide less overestimate of independent variables than the non orthogonal case.
Some properties of new hesitant fuzzy operators
Authors: Nazra A , Asdi Y , Yuspa W A , Wahyuni S 
Published: November 2019

Abstract
Hesitant fuzzy sets are tools that appear and are useful for dealing with vagueness and uncertainty. Interestingly, we can determine two new operators inspired by operators which have been defined. Some properties associated with binary operations of hesitant fuzzy elements that were introduced by previous researchers are constructed. We obtain several relations between the new operators and such binary operations. Here we also give a correction of a result in previous related article.
The differences in geometry cognitive learning results using ICTAdobeFlash CS6 program
Authors: Zainil M , Helsa Y , Ahmad S , Ningsih Y , Ningsih H , Yanti W T 
Published: November 2019

Abstract
This research is motivated by the lack of students’ interest in learning mathematics that isconsideredto be difficult and tedious. Then, this problem results the low cognitive learning outcomes of the students. The matter happens because the teacher is still considered to be the centre in learning process, the lack of variations in instructional media, and the way the teachers teach in the class. This study aims to determine whether there are differences in the students’ cognitive learning outcomes from the use of ICT instructional media using adobe flash CS6 programs at SDN 01 and 09 Bandar Buat. This type of research is a quasi-experimental in the form of non-equivalent control group design. The sampling technique is purposive sampling, in which the first class is chosen as the control class and the second class is the experimental class. The instrument used in this study is an objective test with multiple choice types. The data analysis technique used is inferential statistical test with t-test. The results show that the values of the experimental class using the ICT media of the Adobe Flash CS6 program based on STAD is 82.66 with a standard deviation 13.67, while the class that does not use ICT media of the Adobe Flash CS6 program based on STAD is 74.84 with a standard deviation of 13.88. It can be concluded that the hypothesis testing using the t-test at the significance level a = 0.05 obtained tcount
= 2.36 and ttable
= 1.99. Thus, the condition in which tcount >ttable
shows that the hypothesis H.
The application think pair share in learning mathematic
Authors: Ningsih Y , Andika R , Sari I K , Ahmad S , Kenedi A K 
Published: November 2019

Abstract
This research was aimed at showing the effect of using cooperative learning type Think Pair Share toward learning outcome of math. This research included two classes in class . The classes were chosen by using Random Sampling. The Design was Treatment by Block Design. The result of the study showed that: (1) The result of the study of the students who were taught by cooperative learning type Think Pair Share modelwas higher than the result those tought by conventional model. (2) The result study of male students who were taught by using cooperative learning model type Think Pair Share is higher than the those tought by conventional model. (3) The result study of female students who were taught by using cooperative type was higher than those tought by conventional model. (4) There was no interaction between the learning model with gender toward students result study.
Utilization of manipulative teaching aids to grow the numerical ability of students with disabilities
Authors: Sugiman  , Suyitno H , Rochmad  , Junaedi I 
Published: November 2019

AbstractChildren with disabilities (CwD) have limitations in conceptual understanding of mathematics. Lack of numerical conceptual understanding will cause CwD to experience difficulty in counting. The purpose of this case study was to analyze the growth of numerical abilities of students with disabilities through the application of manipulative teaching aids. This research method used a qualitative approach. The subjects of this study were students of the seventh grade of the State Extraordinary School of Salatiga (SLBN) who had limited vision, mind, hearing, or speech impairment. After the results of the students’ work were corrected, the qualitative data analysis was done by analyzing the results of the test, interview, and triangulation data. The results of this research: Through the use of Manipulative Teaching Aids, the numerical abilities of CwD could be improved and developed. It is recommended that teachers in ES should use Manipulative Teaching Aids so that the numerical abilities of CwD can be improved and developed.