Indonesia Conference Directory

Corresponding Author
ginting Andarias

Institutions
Universitas Negeri Jakarta

Abstract
Abstract. The study aimed to determine the effect of anaerobic interval training, the difference in the increase in swimming speed between swimmers who have good and less arm muscle power, and the interaction effects of the three research variables. The study sample collected 24 people obtained by purposive sampling technique. The study was conducted by factorial 2x2 design. The research variable consisted of manipulative independent variables; Anaerobic interval training ratio 1:3 and 1:5. Independent variable attributes; arm muscle strength, dependent variable; 50 meter freestyle swimming speed. Data strength was obtained through full vertical arm test, swimming speed data with 50 meter distance test. The data analysis technique uses two-way ANAVA statistics with a significance level of α= 0.05. Research result; There is no significant difference between anaerobic interval training ratio 1:3 and 1:5 to increase the 50 meter freestyle swimming speed, as evidenced by the Fobs=1.19

Keywords
Anaerobic Interval, Working-Rest Time Ratio, Arm Muscle Power, Swimming.

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/bCWjte47cvGw

Corresponding Author
Dicky Rezky Munazat

Institutions
(a)Department of Physics, Universitas Indonesia, Depok 16424, Indonesia
*budhy.kurniawan[at]sci.ui.ac.id
(b)Research Center for Metallurgy and Materials, Indonesian Institute of Sciences (LIPI), Gedung 470, Puspiptek, South Tangerang 15314, Banten, Indonesia

Abstract
Polycrystalline La0.7Sr0.2Ba0.1Mn1-xNixO3 (x = 0.02 and 0.05) has been successfully synthesized by sol-gel method. This research aims to investigate the effects of low nickel substitution on the correlation between structure, microstructure, and electrical transport behavior. From Rietveld refinement result, crystal structure both samples were found to be Rhombohedral with R-3c (167) space group. Low nickel substitution at Mn-site shows that the Mn-O-Mn bond angle decreases and the Mn-O bond length increase which linked Jahn-Teller distortion, double exchange, core-shell model, and percolation model. Scanning electron microscope (SEM) result reveals that nickel substitution leads to smaller grain size. Temperature-dependent resistivity ρ(T) has been measured at 15-285 K with zero field cooling. The ρ(T) increases with decreasing grain size because of the enhancement of the grain boundary effect with the increase in the nickel content. The Curie temperature (TCMod) and the temperature of the metal-insulator transition (TM-I) moves to lower temperatures with increasing nickel substitution content. Percolation model can describe the electrical behavior of both samples based on electron-electron, electron-magnon, and electron-phonon scattering, and Kondo-like spin dependent scattering at low temperature and adiabatic small polaron hopping at high temperature.

Keywords
Nickel Substitution, Mix Valance Manganite, Percolation Model, Resistivity

Topic
Material Science

Link: https://ifory.id/abstract/xvdDfk8tEgPL

Corresponding Author
Syadan Ismail

Institutions
Universitas Sriwijaya, Universitas Muhammadiyah Palembang

Abstract
Financial Technology: Online lending bussiness is getting a bad perspective generated by the conflict of the default loan. Fintech gets the access easily to the unbanked small and medium enterprises (SME/UMKM) those are one of some factors of the default while another reason is the very high interest. Does this fintech gives some advantages to the SME-s business yet waiting for the bank services which is have less priority, rigid and complex rules by the regulator? This article is going to disscuss the role of Financial Techology: Peer to Peer Lending for SME in a safe and halal ways. Keywords: Financial Technology, Peer to Peer Lending, Crowdfunding, Small and Medium Enterprises, Halal Loan

Keywords
Financial Technology, Peer to Peer Lending, Crowdfunding, Small and Medium Enterprises, Halal Loan

Topic
International Conference of Islamic Economic and Financial Inclusion

Link: https://ifory.id/abstract/pXrfNAwmeQJM

Corresponding Author
Vera Maya Santi

Institutions
a) Department of Statistics, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta
b) Department of Statistics, Faculty of Mathematics and Natural Science, Institut Pertanian Bogor

Abstract
Variable selection is an important topic in linear regression analysis. In practice, a large number of predictors usually are introduced at the initial stage of modeling to attenuate possible modeling biases. stepwise deletion and subset selection are usually used which can be computationally expensive and ignore stochastic errors in the variable selection process. In addition, the best subset selection of variables suffers from several disadvantages, the most severe of which is its a lack of stability. In this article, penalized likelihood approaches are proposed to handle these kinds of problems. The proposed methods select variables and estimate coefficients simultaneously. Some of penalty functions are used to produce sparse solutions. Based on the RMSE and GIC criteria, it was found that the factors affecting Indonesian mathematics scores from PISA with 148 independent variables showed that the SCAD penalty function had the best performance compared to LASSO, Ridge and MCP. LASSO produces 13 important variables for the model while SCAD has 11 variables which mean that the LASSO model is more complex than SCAD. The MCP produces a simpler model with 3 important variables but produces excessive bias.Ridge penalty has a worst performance based on all criteria.

Keywords
Variable Selection; Penalized Likelihood; SCAD; LASSO; MCP; Ridge; GIC; RMSE.

Topic
Mathematics

Link: https://ifory.id/abstract/AxC9NBMjKQrk

Corresponding Author
Twediana Budi Hapsari

Institutions
Kuliyyah of Islamic Revealed Knowledge & Human Sciences, International Islamic University Malaysia (IIUM), Malaysia

Abstract
In general, Islamic Philanthropy is an important instrument which can solve the socio-economic problem of a country. The ultimate goal of Islamic Philanthropy is to benefit the economy and society. The history of Islamic Philanthropy started since the time of Prophet Muhammad S.A.W. and has been continuously developed until today. This paper aims to investigate participant of Muslim women in Islamic philanthropy in digital era specifically in the contribution of waqf institutions in Malaysia. History and present has shown evidence of significant contributions of women in Islamic Philanthropy as founders, beneficiaries and mutawallis or trustees. The methodology that has been applied in this research is library research, seeking evidence of selected Malaysian experiences of women participation in Islamic Philanthropy in the past and at present. The expected result is to analyse Malaysian experiences in the participation of Muslim women in Islamic Philanthropy institutions in digital era and to identify the need for improvements of the socio-economic conditions of the society.

Keywords
Islamic Philanthropy, Women, Participation, Society, Malaysia

Topic
International Conference on Islamic Studies in the Digital Era

Link: https://ifory.id/abstract/E2PegdDqc6MV

Corresponding Author
Astri Rinanti

Institutions
Universitas Trisakti

Abstract
Banana peels waste contains lignocellulose which can be converted into starch and then broken down into glucose which will produce bioethanol. This study aims to reduce organic waste and determine the enzymatic activity of Aspergillus fumigatus fungi on banana skin enzymatic hydrolysis in the manufacture of bioethanol. The process starts from delignification followed by the hydrolysis process using a chemical catalyst, H₂SO₄ as a comparison and biological catalyst namely Aspergillus fumigatus. The study showed that the hydrolysis process was successfully carried out using a biological catalyst at a temperature of 30°C and a contact time of 3 days. During the hydrolysis process, the starch content was 3% - 4% using the DNS method. This shows that the use of banana peels waste containing lignocellulose can be used as a source of bioethanol which aims to reduce organic waste.

Keywords
Biocatalys, Lignocellulose, Hydrolysis process, Enzymatic activity, Aspergillus fumigatus

Topic
Environmental Engineering

Link: https://ifory.id/abstract/xcBYm8T2PjnH

Corresponding Author
Twediana Budi Hapsari

Institutions
Kuliyyah of Islamic Revealed Knowledge & Human Sciences, International Islamic University Malaysia (IIUM), Malaysia

Abstract
This paper discusses about the issues in producing of collagen-like protein. In this digital era, it is stated that there are existing challenges in production of Halal recombinant collagen-like protein. Initially, a number of collagen-like proteins have been recognised in bacteria during the last ten years, plenty of challenges are identified. The objective of this paper solved the challenges of recombinant collagen-like protein to overcome the high demands of collagen in this digital era, limited supplies of collagen alternative, difficulty in addressing the post-translational modification of recombinant human collagen and the Halal certification of the material itself. It relies on inductive methodology to collect the Qur-anic verses as well as Hadith that related to face the challenges of recombinant collagen-like protein and the analytical method to analyse Qur-anic verses and Sunnah associated with this subject. The findings may also provide better understanding towards issues of Halal policy on recombinant collagen-like protein acceptance on the concept.

Keywords
collagen-like protein, Halal policy, Halal issues, Halal production, digital era.

Topic
International Conference on Islamic Studies in the Digital Era

Link: https://ifory.id/abstract/zy3mvRYPpawT

Corresponding Author
Ikhwan Nur Rahman

Institutions
a) Departement of Physics, Faculty of Mathematics and natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
*budhy.kurniawan[at]sci.ui.ac.id
b) Research center for Metallurgy and Materials, Indonesian Institute of Science (LIPI), Gedung 470, Puspitek, South Tangerang 15314, Banten, Indonesia

Abstract
Bulk polycrystalline sample of La0.8Ag0.2MnO3 has been successfully synthesized by the sol gel method. Structural, morphology, electrical properties and magnetoresistance has been investigated. Refinement results from XRD at room temperature showed a single phase material with a rhombohedral crystal structure and R-3c space group. Electrical transport showed by comparison of experimental data with theoretical model, the sample undergo a metal-insulator transition at TM-I accompanying the ferromagnetic-paramagnetic transition. Data for temperature dependence of resistivity has been fitted using the formula ρ(T)= ρ_FM f+ 〖(1-f)ρ〗_PM, ρFM is resistivity of the ferromagnetic region, ρPM is resistivity of the paramagnetic region and f is the volume fraction of ferromagnetic phase. Result of fitted data is in good agreement with experimental data. MR measurements in the range of magnetic field 0-1 T, measurements were carried out at temperatures of 15 K, 100 K, 200 K and 285 K, the results showed a decrease in resistivity.

Keywords
electrical transport; magnetoresistance; percolation model

Topic
Material Science

Link: https://ifory.id/abstract/c8JkTUnaBRjE

Corresponding Author
Twediana Budi Hapsari

Institutions
Centre for Islamisation
International Islamic University Malaysia, Malaysia

Abstract
There is no doubt that the Holy Qur an is the words of Allah that is unchangeable. The most accurate in its verses and words, prodigious in its rules, letters and arrangements that cannot be moved forward or backward, no deletions or additions on it. No falsehood can approach it from before or behind it. It is sent down by One Full of Wisdom, worthy of all Praise. Perhaps this paper, can be seen as a great sea of knowledge. This paper highlights the importance of serving the Holy Book whose endless wonders and knowledge are not enough to create a satisfaction to the scientists. However, there are many earlier works before this work that have addressed this matter by former scholars who inspired us by their work. We have classified these statistics based on the general statistics of the Qur-an, followed by the revelation order and comparison with the order of the Suras in the Holy Qur-an. Moreover, the places of prostration are referred to in the Holy Qur-an and the most frequent names of Allah in the Holy book. This study also includes the statistics of the verses in the Holy Qur-an and the longest and shortest verses in terms of the number of letters and the number of words. This paper includes the roots of the Quranic words and the most frequently mentioned words. The calculations of the letters in the book of Allah, their frequencies and the ratio of the number of letters to the words of the Qur-an as well as the ratio of the number of letters to the verses of the Quran. The computer was used for the collection and initial classification of the Quranic databases processes.

Keywords
Quranic databased process

Topic
International Conference on Islamic Studies in the Digital Era

Link: https://ifory.id/abstract/2EjKYXJwFaU4

Corresponding Author
Yuli Rahmawati

Institutions
(a) Universitas Negeri Jakarta
Jl Rawamangun Muka, Jakarta Timur
*yrahmawati[at]unj.ac.id

(b) Universitas Halu Oleo
Jalan Kampus Bumi Tridharma, Andunohu, Kambu, Kendari, Sulawesi Tenggara

Abstract
This study aimed to analyse the students- cognitive structure on the concept of oxidation reduction by employing learning cycle 8E model. The participants of 32 students in year-10 were involved in the study. The data was collected by drawing writing technique presented through student worksheets, interview, observations, and reflective journal. The learning cycle 8E was applied which consist of engage, explore, e-search, elaborate, exchange, extend, evaluate and explain stages. Data analysis consists of data reduction, data presentation, and conclusion. Students- cognitive structure was divided into three categories which are an understanding, misconception and no understanding. Categories of understanding were found in the concept of redox, oxidizing agents and acid-base nomenclature and transitions. Students- misconception categories were found in redox applications and polyatomic. Students faced the challenges in understanding the oxidation number and binary nomenclature. The results showed that misconceptions were decreased through the implementation of the learning cycle 8E. Learning cycle 8E also has implications on students- critical thinking, collaboration, and empathy communication skills.

Keywords
learning cycle 8E model, drawing writing technique, reduction oxidation drawing writing technique, cognitive structure, misconceptions

Topic
Chemistry

Link: https://ifory.id/abstract/QXnRdhWFNMEy

Corresponding Author
Twediana Budi Hapsari

Institutions
Department of Arabic and Literature,
Kulliyyah of Islamic Revealed Knowledge and Human Science
International Islamic University Malaysia

Abstract
Translators of religious text between the language pair of Arabic and English are often faced with problems related to lexical items, terms, idioms and context. The internet has been of a highly significant resource for the translators to look for assistance for the purpose of finding, clarifying and validating their translation choices of certain problems they encounter. This paper outlines the various problems encountered by translators of religious Islamic text between the language pair of Arabic and English and the solution found in the internet be it from the online dictionary, the encyclopedia, the advanced search tools in google search and other tools. The paper will also discuss about the advantages and shortcomings of these tools and the ways of optimizing its use. Samples are taken from the translation of the Holy Quran, the prophetic traditions and other major Islamic resources. The problems will be explained and relevant tools from the internet will be related to the problems in terms of its usefulness in assisting the translators.

Keywords
Translating – Religious Texts – Arabic – English – Tools – Problem Solving – Digital Era

Topic
International Conference on Islamic Studies in the Digital Era

Link: https://ifory.id/abstract/f3MdFZxyLKJb

Corresponding Author
Novi Anggreani

Institutions
(a) Program of Pascasarjana Physic, FMIPA, Universitas Negeri Jakarta, Indonesia
(b) Department of Physic, FMIPA, Universitas Negeri Jakarta, Indonesia
(*) novianggreani120[at]yahoo.com

Abstract
The standard teaching process in the context of education is not only about how the learning process take place. But it also relates to appropriate and adequate learning resources. The appropriate and adequate learning resources are important factors in the learning process in order to create a productive learning environment. This productive learning environment is the process of creating a learning climate based on environmental regulation, the provision of tools and learning resources that contain learning objectives, materials, methodologies and assessment of learning that enable students to feel comfortable and enjoy learning effectively and optimally according to their needs and technological developments, then adjusted to their interests and potential. This study aims to design and implement an educational process with the help of appropriate learning resources. Thus it will creating a meaningful educational process by discovering for the knowledge of mastery of physical concepts that can support life in understanding daily phenomena with scientific knowledge and science in momentum material and impulses using the development research of borg gall. Thus students can grow and improve scientific literacy.

Keywords
e book development, Momentum and Impulse, Student Science Literacy

Topic
Physics

Link: https://ifory.id/abstract/q2aZKRL9BNVE

Corresponding Author
Astri Rinanti

Institutions
Universitas Trisakti

Abstract
This research aims to know the waste cassava peels is cleaned for glucose levels that will be used as raw material for fermentation process through bioethanol. Cassava peels contain lignosellulosic which consist of 43% cellulose, 38% hemicellulose, and 19% lignin. This research process is done in two stages, namely the process of pretreatment/delignification and hydrolysis. Delignification is done by making use of Aspergillus fumigatusi in Potato Dextrose Broth medium and performed a cassava peels is cleaned up to size 40 mesh. Pretreatment uses the variation comparison of fungi against raw material of 1:1, 1:3, 1:5 and the contact time of 1, 3, and 5 days. The analysis stage pretreatment using Chesson method. Phase hydrolysis sulfuric acid (H2SO4) 1% and heated at a temperature of 100oC for 2 hours. The analysis phase hydrolysis using DNS method to get sugar levels. In this study, obtained the best levels of lignin after pretreatment is by 8% and the research proves that cassava peels delignification retrieved from enzymatics activity of Aspergillus fumigatus and produces 10% of the total sugar samples is used. Further research needs to be done to increase sugar levels from raw cassava peels.

Keywords
Cassava peels, enzimatyc, lignosellulosic, Aspergillus fumigatus, waste.

Topic
Environmental Engineering

Link: https://ifory.id/abstract/LGPdCWjNtaYK

Corresponding Author
Astri Rinanti

Institutions
Universitas Trisakti

Abstract
Water hyacinth is a water weed that causes an imbalance of the ecosystem so it needs to be processed into a useful product. This research was conducted to convert water hyacinth as lignocellulose-containing biomass by utilizing Aspergillus fumigatus fungi as a biocatalyst. This study began with cultivation of Aspergillus fumigatus in Potato Dextrose Broth media and preparation of water hyacinth to 100 mesh in size. Pretreatment is done by using a variation of the ratio of fungi to biomass at 1: 1, 1: 5, and 1:10 and contact times 1, 3, and 5 days. Determination of lignin as a result of pretreatment was carried out by the Chesson method. The hydrolysis stage takes place after the pretreatment stage to get fermentable sugar. The sugar content is analyzed using the DNS method. In this study, it was found that the best reduction in lignin levels after pretreatment was 38.6% and produced sugar of 12.5 g/L. A fermentation process and further research is needed to determine the potential of water hyacinth as a raw material in the production of bioethanol.

Keywords
Eichhornia crassipes, Pretreatment, Hydrolysis, Aspergillus fumigatus

Topic
Environmental Engineering

Link: https://ifory.id/abstract/Fm9tyxBcLgvH

Corresponding Author
Yulian Findawati

Institutions
Universitas Muhammadiyah Sidoarjo

Abstract
Weather forecast in an area is unpredictable. This is due to the fact that human factors cannot predict it. However, by presenting previous weather reports or data, science can be used as a reference to see weather forecast patterns . The weather forecast is by applying data mining using the algorithm Naive Bayes , K-nearest Neighbor (K-NN), and K-Means Clustering. Bayesian Classification is a statistical classification method that is useful for the process of determining the probability of a class membership. K-Nearest Neighbor Algorithm is a classification algorithm based on the similarity between one data and another data. K-Means clustering is an unsupervised learning algorithm that, as the name hints, finds a fixed number (k) of clusters in a set of data. Data used in the last 3 years (starting 2014-2017) which is daily weather data from the website of the Meteorology, Climatology and Geophysics Agency. Daily weather conditions consist of rainfall, irradiation, maximum temperature, minimum temperature, maximum humidity, minimum humidity, maximum air pressure, minimum air pressure, wind speed and wind direction. While the weather forecast label is not rainy, light rain, moderate rain, heavy rain and very heavy rain. Analysis using Rapid Miner tools

Keywords
Weather Forecast, Naïve Bayes, K-Nearest Neighbour, K-Means Clustering

Topic
Computer Science

Link: https://ifory.id/abstract/eMYzbBr8G6Lg

Corresponding Author
Jamiatul Hasanah

Institutions
1.Postgraduate Student of Science Education, University of Mataram. Jalan Majapahit No 62, Lombok, Indonesia.
*jamihasanah94[at]gmail.com
2.Science Education, Postgraduate Program, University of Mataram. Jalan Majapahit No 62, Lombok, Indonesia.

Abstract
Abstract. The Problem of science learning at schools usually relates to teaching materials. Teaching materials used as study guides are usually not in accordance with the character and environment of students. This research aims to develop scientific teaching materials based structured inquiry assisted by animation media. The development procedure in this research uses the Dick & Carey model which has 10 development stages namely asses need to identify instructional goal, conduct instructional analysis, analyze learner and contexts, write performance objectives, develop assessment instruments, develop and select instructional material, develop instructional strategy, design and conduct formative evaluation of instruction, revise instruction, design and conduct summative evaluation. The quality of developed product was assessed through feasibility test by two experts and one teacher as a user. Feasibility aspects that are assessed are the content, presentation, language, graphics, and learning media. The feasibility percentage of each aspect was 84%, 88%, 85%, 79% and 83%. The average result of the feasibility presentation value is 83,8%. In conclusion, scientific teaching materials based structured inquiry assisted by animation media is very feasible to be applied in the learning process in junior high school.

Keywords
scientific teaching materials, structured inquiry, animation media

Topic
Biology

Link: https://ifory.id/abstract/7rwTCh89dzP4

Corresponding Author
Umar Faruq

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
*budhy.kurniawan[at]sci.ui.ac.id

Abstract
The effect of sintering temperature on the structure and morphology of Ca0.95La0.02Bi0.03MnO3 was investigated by X-ray diffraction and Scanning Electron Microscopy. The sample was prepared by sol-gel method. Their homogeneity was confirmed using X-ray diffraction. Rietveld refinement of X-Ray diffraction results showed that the sample sintered at 1100 C for 12 h are single phase and have an orthorhombic structure with Pnma space group. While the samples were sintered at 900 C and 1000 C did not show a single phase due to another peak is found. For the lattice parameter, crystal volume increases with increasing sintering temperature. The largest crystal volume was reached at sintering temperature 1100 C which is equal to 208.535 Å. For the angle of the Mn-O-Mn bond, the sample was sintered at 1000 C has the largest value obtained 152.778 (deg) while at 1100 C is 152.702 (deg) and 900 C is 151.652 (deg). For the average Mn-O bond length shows relatively the same value for all sintering temperature. Scanning Electron Microscopy was used to study the morphology of the materials, grain size increases with increasing sintering temperature.

Keywords
CaMnO3, Sintering temperature, Sol-gel method, Lattice parameter

Topic
Material Science

Link: https://ifory.id/abstract/ubTHAKMJtCBF

Corresponding Author
Siti Maryam Rohimah

Institutions
(a) Pasundan University
(b) Mathematics Education Department, Indonesia University of Education

Abstract
This study aims to identify the types of difficulties experienced by high school students in solving equations and trigonometric identities. The method used in this research is descriptive qualitative research method because researchers want to describe or describe the facts of students difficulties in solving equations and trigonometric identities. The data collection technique in this study is by using respondents ability tests and interviews. Based on the results of data analysis, there are three aspects of students difficulties in solving trigonometric equations and also there are three aspects of students difficulties in solving trigonometric identity problems. The difficulties of students in solving trigonometric equations, namely the difficulty of students in deciphering the form of the problem, difficulty in factoring in the form of trigonometric quadratic equations, and difficulties using the basic trigonometric equations. Whereas, the difficulties of students in solving trigonometric identity problems, namely the difficulty of students applying general trigonometry formulas, difficulty describing each of the trigonometric comparison relationships, and difficulties in performing algebraic calculations/computation.

Keywords
mathematical difficulties, trigonometric equations, trigonometric identities

Topic
Mathematics Education

Link: https://ifory.id/abstract/Ugbvw2LVpAkE

Corresponding Author
dhawud sabilur razaq

Institutions
(a) Department of Physics, Universitas Indonesia, Depok 16424, Indonesia
* budhy.kurniawan[at]sci.ui.ac.id
(b) Research Center for Metallurgy and Materials, Indonesian Institute of Sciences (LIPI), Gedung 470, Puspiptek, South Tangerang 15314, Banten, Indonesia

Abstract
A systematic study of the La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3 manganites have been conducted, mainly to understand the influence of sintering temperature on structure, microstructure, and electrical transport properties in the materials. Polycrystalline sample of La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3 were prepared using sol-gel method and sintered at 1100 °C and 1200 °C. X-ray diffraction result shows that sintering temperature does not affect the crystal structure of the materials which remain rhombohedral with R-3c space group. a more detailed examination shows that sintering temperature change the unit cell volume, bond length, and bond angle of the samples. The electrical resistivity decreases followed by the decrease in the grain size with the increase in sintering temperature. Analysis using theoretical model shows that both samples can be well explained using percolation model. Fitting result suggests that the transport properties of the materials at low temperature were governed by the scattering and interaction between electron, phonon, and magnon. At high temperature, the electrical transport of the samples were governed by the hopping of polarons.

Keywords
Structure; Electrical Transport; Sintering; Percolation Model; Manganites

Topic
Material Science

Link: https://ifory.id/abstract/QhkW6jvTfrCw

Corresponding Author
Muhammad Afif

Institutions
a) Faculty of Computer Science, University Of Indonesia, Depok,West Java 16424, Indonesia *muhammad.afif91[at]ui.ac.id
b) School of Electrical Engineering, Telkom University, Bandung 40257, Indonesia

Abstract
In Indonesia, many LED drivers have a large Reactive Power and Small Power Factor thus not suitable with harmonic standards. It causes expensive electricity by using LED Driver on a large scale like in factory and office. LED Driver is one of the most important components in Lightning Equipment which has the greatest harmonic value for use in factory or office. A good LED driver must have power factor value more than 0.86 of small reactive power and suitable with harmonic standards. This proposed study uses Linear LED Driver using Low Pass Filter and Single Tuned Filter, which using measurement and comparison based on harmonic standard with power factor value less than 0,86. Since it has a low price, fit harmonic standard, low reactive power and high power factor. The result shows that the measurement using Single Tuned Filter PF 0,97; THDi 24,3%; Q 2.5 VAR; P 11 W and Low Pass Filter PF 0.9; THDi 23% ; Q 1.3 VAR and P 2.709 respectively.

Keywords
Harmonic Standard; LED Driver; Low Pass Filter; Single Tuned Filter; Reactive Power; Power Factor

Topic
Electrical Engineering

Link: https://ifory.id/abstract/3jAzV7UdwTMe

Corresponding Author
Eka Purnama Indah

Institutions
a Pendidikan Jasmani Kesehatan dan Rekreasi, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Lambung
Mangkurat, Jalan Brigjen Haji Hasan Basri Kayutangi, Banjarmasin, Kalimantan Selatan
*ekapurnama_i[at]yahoo.com
b Universitas Negeri Jakarta, Pendidikan Olahraga Pasca Sarjana, Gedung M, Komplek Universitas Negeri
Jakarta, Jalan Rawamangun Muka RT.11, RW 14 Rawamangun, Pulogadung, Jakarta Timur.

Abstract
Muscle strenght of core in diving is one of important roles to completing the dive. Various types of excercise model such as Total Body Resistance Exercise (TRX) and Swiss ball be able to increase the muscle strenght of core. This study aims to determine the effectivity of TRX and swiss ball exercise model on improving core muscle strenght in diving athletes. The population are West Java diving athletes with sample as many as 30 peoples which used the true eksperimental method with two group pre-test and post-test design. The result of this study indicate that TRX and swiss ball excercise model was effective to increase the core muscle strenght in diving athletes, and TRX was more effective than swiss ball excercise modeL on improving core muscle strenght in diving athletes.

Keywords
Keywords: Excercise model; TRX; Swiss ball; Core muscle strenght; Diving.

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/AHbVWNqwkBjQ

Corresponding Author
NURUL FAUZIAH

Institutions
a) Postgraduated student of Science Education, University of Mataram. Jalan Majapahit No. 62, Lombok, Indonesia
*imnurulfz[at]gmail.com
b) Science Education, Postgraduated Program, University of Mataram. Jalan Majapahit No. 62, Lombok, Indonesia

Abstract
Chemistry learning should be able to facilitate students to have 21st century competencies and skills and also conservative attitude towards the environment. However, in its implementation was encountered obstacles, one of which is the problem of representative learning devices. The aims of study to produce and discover the quality of problem-based learning devices oriented to green chemistry in the reaction rate concept. Learning device consists of syllabus, lesson plan, student worksheet, modules, and test instruments. This research and development adapted Nieveens model which consisted of four stages: preliminary research, prototyping stage, summative evaluation, and reflection and documentation. The quality of the learning devices developed was measured through analysis of validity and practicality. Product validity assessment used validation questionnaires distributed to experts, the data obtained were analyzed by using the content validity formula. Practicality used response questionnaires assessed by teachers and students, and implementation of learning was analyzed by using a percentage of practicality. This study resulted in the average of content validity being 0,67 categorized valid. The practicality percentage of each espect is 90,87%, 80,06%, and 80,56% catogorized highly practical. The concluded that learning devices developed fulfills the criteria for developing quality products that are valid and practical.

Keywords
Learning devices, problem-based, green chemistry, reaction rate concept.

Topic
Chemistry

Link: https://ifory.id/abstract/YrDwdCmM3ub2

Corresponding Author
TARYUDI .

Institutions
Faculty of Engineering, Universitas Negeri Jakarta
Jakarta, Indonesia
Email: (*)taryudi[at]unj.ac.id

Abstract
Sign language is one of the most effective ways to communicate with deaf people. However, not everyone is able to use sign language. Therefore in this study, a sign language display system was created using a hand robot that was moved through an Android-based application on a smartphone to overcome this problem. The design and development of the system begin from the manufacture of hardware consisting of one hand robot with 11 servo motors as the actuators, the Arduino Mega 2560 microcontroller as the main controller and a Bluetooth module for wireless communication between hand robot and smartphone. Then software development is carried out on the hand robot controller and android based application on a smartphone. Furthermore, system testing is carried out by validating the results of the letters and numbers shown by hand robot with gestures in the Indonesian Language Signaling System Dictionary (SIBI). The results show that the hand robot has been able to display letters and numbers according to the instructions given by an Android-based application on a smartphone with an 80% accuracy rate.

Keywords
Robot hand, Indonesian sign language, Arduino, Android

Topic
Electronics Engineering

Link: https://ifory.id/abstract/rLNTn87E3K9Q

Corresponding Author
Heri Setiawan

Institutions
Electrical Engineering Departement, State Polytechnic of Malang. Jl. Soekarno-Hatta No. 9, Malang 65141, Indonesia

Abstract
Greenhouse is currently used to urban farming. Smart greenhouse technology allows farmers to monitor their plants easyly. This systems require much electricity energy supply. In order to save energy, additional electricity supply is needed. For this reason, photovoltaic is installed on the roof of the greenhouse. The obstacle in the installation of photovoltaic cells is that the power produced is not optimal, due to the movement of the suns position. For this reason, Maximum Power Point Tracking (MPPT) technology is used. In this paper, fuzzy logic was used for Maximum Power Point Tracking (MPPT) based on I and V from PV. The aim is to find the maximum operating point of a photovoltaic module so that it can increase the output power ratio of photovoltaic modules in varying temperatures and radiation levels. Simulation is done using MATLAB, so that a ratio of output power ratios is generated using MPPT and without using MPPT. By using the fuzzy MPPT controller, it produces optimum power, 142.5 W, when Vpv=30.05 V and Ipv=4.743A. This power will be used to supply electricity for 2 15 W lamps, 12 volts for the mini greenhouse

Keywords
mini Greenhouse, photovoltaic, MPPT, cuk converter, fuzzy

Topic
Electrical Engineering

Link: https://ifory.id/abstract/WrueAdCB7mav

Corresponding Author
Muktiningsih Nurjayadi

Institutions
1 Department of Chemistry, Mathematics and Science Faculty, Universitas Negeri Jakarta 2Laboratory of Agro and Biomedical Industry Technology Development, Badan Pengkajian dan Penerapan Teknologi (BPPT)

Abstract
Typhoid fever is an endemic disease in Indonesia. Prevention of typhoid fever can be done by administering vaccines. It is known that one of the raw materials for vaccines is a recombinant protein. This study aims to obtain information on the optimum conditions for purification of Salmonella typhi Fim-C recombinant protein with Ni-NTA resin as vaccine raw material. The three main stages of the purification process in this study were binding, washing, and elution of S. typhi Fim-C recombinant proteins. The binding and washing variations of recombinant proteins were carried out twice, four times and six times, while the elution process was carried out at imidazole concentrations of 200 mM, 250 mM, and 300 mM. Purification with a binding process four and six times gave almost the same intensity of S. typhi Fim-C protein bands. Whereas protein was elution at an imidazole concentration of 300 mM showed higher band instability. The results of characterization using SDS-PAGE and analysis using software ImageJ gel analysis showed that the longer the incubation time and the repetition of the binding process, the more protein bound to the resin. Furthermore, the more washing processes are obtained the purer proteins. Based on the data obtained it can be concluded that the purification of the S. typhi Fim-C recombinant protein was optimum at a four-time binding process, six times washing and a 300 mM imidazole concentration. These results are expected to be the basis for recombinant protein refining on a pilot scale and industry scale in better vaccine preparation.

Keywords
Salmonella typhi, Protein purification, Recombinant Protein, Ni-NTA Resin

Topic
Chemistry

Link: https://ifory.id/abstract/xuHnTJyCe4Qz

Corresponding Author
Eko Agus Suprayitno

Institutions
Eko Agus Suprayitno (a*), Mochammad Rizal Marlianto (b), Metatia Intan Mauliana (c).
(a*). Electrical Enginering Departement , Universitas Muhammadiyah Sidoarjo.
*eko.agus[at]umsida.ac.id
(b). Electrical Enginering Departement, Universitas Muhammadiyah Sidoarjo
(c).Informatics Enginering Departement, Universitas Muhammadiyah Sidoarjo

Abstract
The progress of science and technology must be able to help resolve human medical problems for human survival. In this study, an integrated measurement of oxygen saturation in the blood, heart rate and temperature of the human body has been made into one tool whose measurement results are displayed directly on the LCD display on a measuring instrument and an Android Smartphone. This tool uses Arduino Nano as its Microcontroller, Bluetooth as wireless serial communication with Android smartphone, Android Application Made with MIT App Inventor, MAX30100 sensor is used to measure blood oxygen saturation and heart rate, and MLX90614 sensor to measure body temperature. Testing Measurements that have been made are calibrated with Industrial standard measuring instruments (Oximeters) and digital thermometers. The result is that the accuracy of the tool reaches 99.62% for blood oxygen saturation measurements, 97.55% for heart rate, and 99.62% for body temperature when compared with industry standard devices. Android applications have been successfully installed on 5 types of smartphones with different brands and specifications. The Bluetooth range of a measuring device for a smartphone in maximum data transfer is 29 meters without a hitch, and a maximum of 21.5 meters with obstacles.

Keywords
MAX30100; MLX90614; arduino nano;, Bluetooth; android

Topic
Electrical Engineering

Link: https://ifory.id/abstract/2cy38mzfruQD

Corresponding Author
Faridl Muhammad Husain

Institutions
Indonesian University of Education, Architectural Engineering Education Study Program, Department of Architectural Engineering Education, FPTK

Abstract
Public understanding of the governments regional development planning program is important these days. This understanding includes the attitude of urban. Urban attitude understanding occurs through the process of urban cultural education. Urban cultural education itself is important because the publics unpreparedness and ignorance of the cultural essence of the city can cause social problems in society life. By maintaining the local wisdom of Bunde Tanah Melayu, the direction of the urban attitude of the Lingga Regency society will be in accordance with the regional identity. This study aims to find out: (1) Information of urban cultural education implementation, (2) Results of the level of change in understanding of urban attitudes. With pre-test post-test group design, this quantitative research carried out to 20 samples of students at SDN 003 Singkep Pesisir, Lingga Regency. The findings of this study are: (1) Students experience an increased understanding of excellent urban attitudes. However, (2) Calculation of the pre-test post-test scores of students showed an insignificant interpretation of the attitude of students urban attitudes. Then, with the research, the importance of the application of city cultural education to increase understanding of urban attitudes is increasingly apparent. However, a much better literature study is needed.

Keywords
Urban Attitude Understanding, Urban Cultural Education

Topic
Architecture

Link: https://ifory.id/abstract/VNeQwJhm4BYF

Corresponding Author
Lipur Sugiyanta

Institutions
UNIVERSITAS NEGERI JAKARTA
Jln. Rawamangun Muka Raya, Jakarta Timur, 13220

Abstract
OSPF (Open Shortest Path First) is routing protocol that are widely used in computer networks. Selection of routing protocols is very important in improving network performance. Calculation of OSPF metrics will determine the performance of data packet delivery. It based on Shortest Path Tree. To find the best route from source to destination, it must determine the shortest path between itself and each router in the network. The router creates this perspective by taking the information in the LSDB and transforming it into a shortest path first tree or SPF tree. It is an algorithmic calculation to construct logical network view performed by the computer within the router. To speed the construction of network tree, PDU size variable is proposed to increase the speed of data packet communication among routers. This research was using Cisco Packet Tracer 5.3 software, simulations were made on a campus network whose PDU variables were modified to obtain the optimum network tree with OSPF routing protocol. The weighted testing parameters in this study is time delay values. Hopefully, the value of redistribution delay is 1% better depending on traffic density. Main route retrieval and alternative package delivery are based on the smallest cost and metric values in the OSPF protocol.

Keywords
campus network, OSPF, SPF tree, time delay, metric

Topic
Computer Science

Link: https://ifory.id/abstract/n6dUTVyE89XQ

Corresponding Author
ZULHAM ZULHAM

Institutions
Faculty of Sport Science, Universitas Negeri Jakarta (UNJ)
Email: zulham_por15s3[at]mahasiswa.unj.ac.id

Abstract
The aim of this research is developing learning model of life skills “Bina Diri” through games (play activities) for intellectual disability students in special school. Intellectual disability (mental retardation), is characterized by below-average intelligence or mental ability and a lack of skills necessary for day-to-day living. Students with intellectual disabilities can and do learn new skills, but they learn them more slowly. Thats why learning model of this research is trying to develop some of abilities that they need to deal well and effectively with the challenges of life, especially to self-development (self-care) in daily activities like drink, eat or communicate to others through games (play activities). This research refers to research and development (R & D) Borg and Gall model with the design of the pre-test and pos-test control group design by 10 stages: 1) Research and information collecting, 2) Planning, 3) Develop preminary form of product, 4) Preliminary field testing, 5) Main product revision, 6) Main field testing, 7) Operational product revision, 8) Operational field testing, 9) Final product revision, and 10) Dissemination and implementation. The preliminary study of this life skills “Bina Diri” learning model recommended that play activities (games) can be applied as model to self-development for intellectual disability students in special school.

Keywords
Life Skills, Learning Model, Intellectual Disability, Self-Development, Play Activities.

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/xuTpKJDyGQEH

Corresponding Author
Rini Puspitaningrum

Institutions
1Dept. of Biology, Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2 Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
Myoglobin is a cytoplasmic hemoprotein with an important role of maintaining oxygen homeostasis of tissues. The brain needs quite a high amount of oxygen to carry out its metabolism. Therefore, this study was conducted to detect the expression level of myoglobin mRNA in the brain of normal rats (Rattus novergicus).The study was conducted at the Biochemistry and Molecular Biology Laboratory of the Biology Major of the Faculty of Mathematics and Natural Sciences, UNJ from December 2010 to February 2011. Through 1.5% agarose gel electrophoresis, results show that the myoglobin band of 114bp was detected in the brain of normal rats (Rattus novergicus). Due to the positive results, there is a huge possibility that the myoglobin expressed in the brain of rats (Rattus novergicus) would be altered into protein during environmental conditions of low oxygen concentration.

Keywords
myoglobin mRNA, normal, brain, Rattus novergicus.

Topic
Biology

Link: https://ifory.id/abstract/rNcgQJ3fxqPy