Indonesia Conference Directory

Corresponding Author
Syamsul Hakim

Institutions
Magister Pendidikan IPA Universitas Mataram

Abstract
The study of semiconductor material is a basic experiment. This study aims to identify the effect of SnO2 doped Indium sol-gel color and the effect of the number of slicks on the thin film spread evenly on the glass transparent. The variation of SnO2 doping Indium is 0, 5, 10, 15, 20, and 25%. The technique used in making thin films uses the sol-gel spin coating technique. Spin coating is a technique that is simple, economical, and produces a fairly good thin film. The manufacturing process kind of three stages namely substrate washing, sol-gel making, and thin film growth done respectively. The results showed that sol gel with doping variations had different colors, the higher doping percentage, the clearer sol-gel solution was. The coating results of the thin films have increased, the more coated the surface of the layer looks more evenly with the number of 1, 2, 3, and 4 slicks respectively. The increase doping variations influence to the transparent color of sol-gel be increased. The increase number of slick effect to the thin films more thickness and smooth.

Keywords
Sol-gel, Spin Coating, thin Films, SnO2, Indium

Topic
Material Science

Link: https://ifory.id/abstract/KDZ2rGedQAPn

Corresponding Author
Irfan Dwiguna

Institutions
UNIVERSITAS KOMPUTER INDONESIA

Abstract
The purpose of this research is to develop technology so that it can be used in transportation modes, one of which is "Travel" transportation. The method used in this security technology is the action research which aims to develop new knowledge products to solve problems with direct application in the real field. The results of this security solution research proved to be effective and efficient in helping travel parties to monitor employees , the location of vehicles and passengers who were given a sense of security, comfort and trust in choosing the travel service. This is because passengers often feel restless because of lack of security facilities, therefore a security system is needed that can be a security and comfort solution for passengers. It is expected that the application of this system can be applied by travel service providers and other public transportation.

Keywords
Security technology, Travel Service, Transportation

Topic
Computer Science

Link: https://ifory.id/abstract/mBwRZeAU2Xcx

Corresponding Author
Hudiana Hernawan

Institutions
Institut Pendidikan Indonesia Jl. Pahlawan no 32 Sukagalih Garut 44151, Indonesia

Abstract
The growth of animals can be determined by various hormones, one of which is somatotropin. Somatotropin has remarkable effects on the tissue growth. This study aims at examining the effects of somatotropin on male rate growth performance. The samples were one hundred and sixty two 2-week old Sprague-Dawley male rats. Data analysis was performed using two-factor nested designs. The first factor was dosage consisting of 3 levels (0, 3, and 9 mg/kg bw/day). The second factor was the injection period consisting of 3 injection periods (day 1 to day 14, day 1 to day 28, and day 15 to day 28). The results showed that during day 1 to day 28 of the injection period, somatotropin improved bone length and bone composition and that no further growth after day 28. This may imply that somatotropin could improve the growth of male rats.

Keywords
somatotropin, bone growth, dosage, injection period

Topic
Biology

Link: https://ifory.id/abstract/X7WMxdwvDrAK

Corresponding Author
Akhmad Ahfas

Institutions
1Electrical Engineering, Muhammadiyah University Sidoarjo

Abstract
Motorbikes are popular of transportation with high usage rates. Safeguarding motorbikes is a necessity for users to provide security. Researchers offer motorcycle safety using sound indicators. The working principle of motorcycle safety offered is after the main key or contact is on position and the Mic sound indicator is blown, amplifier circuit works to drive the relay driver that connects the CDI unit. Motorcycle safety circuit system will live and if there is no blow, motorcycle safety circuit will not function. Research on motorcycle safety circuit can be used with input indicator sound. Components needed include Mic condenser, driver relay circuit, power supply. Measurement of the relay driver circuit and condenser mic aims to find out which circuit can work as planned. The measurement results obtained testing the motorcycle safety circuit with the following explanation: When the sound indicator and driver get a touch simultaneously which gives a signal that the signal from the sound indicator is connected to the amplifier driver, so that the signal is detected, will provide input to the relay (on) and CDI unit when the motorcycle will work. With an indication the LED will turn on.

Keywords
Motorcycle safety circuit system

Topic
Electrical Engineering

Link: https://ifory.id/abstract/pj6KgBD9aFGk

Corresponding Author
Busro Busro

Institutions
1,2,3,4 UIN Sunan Gunung Djati Bandung
5 STMIK Primakara

Abstract
Speech recognition is a process of recognizing letters, words or sentences that are spoken. Voice recognition is better known as Automatic Speech Recognition (ASR). Automatic Speech Recognition (ASR) has been widely applied in everyday life, for example is the operation of a smartphone that is run through automatic commands (voice recognition). The letter of origin is the place where the letter is released when the letter is pronounced. The letter of origin is the basis for reading the verses of the Koran. Errors in the pronunciation of letters or in makhraj letters, can cause differences in meaning or meaning errors in the verse being read. Generally the method of learning to read the Koran is used accompanied by accompanying teachers who are proficient in their fields. In this final project, a sound matching application was built on the pronunciation of Ayat Al-Quran as a learning medium for children using the Fast Fourier Transform (FFT) Algorithm and Divide Conquer (DC) that support learning independently. The system built in the final project is to utilize the Google API feature on android as voice matching. Furthermore, the incoming sound will convert into text form using the Google API. The conversion method used is Fast Fourier Transform (FFT). The valuation method, Divide Conquer is used by calculating the sound proximity value of the Google API conversion results by matching Arabic text in the database. Based on the testing that has been done on the system testing. The results of the test found 61.1% accuracy for the appropriate reading and 38.9% for inappropriate reading.

Keywords
Sound Matching, Google API, Divide Conquer

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/WpQRPdhA3HcZ

Corresponding Author
Muhammad Rifan

Institutions
Universitas Negeri Jakarta

Abstract
Spatial Artificial Neural Network (ANN) is proposed as a new approach to determine the level of energy consumption in the future in the Palembang region, South Sumatra. Back-propagation is used to train Artificial Neural Networks. Population size, Gross Regional Domestic Product (GRDP), economic growth, Household Energy Consumption spatially per sub-district is used for this estimate. Data for 2012-2016 is used to train Spatial Neural Networks (ANN) and Data for 2017-2018 is used to validate this new approach to electricity demand prediction. The proposed Spatial ANN approach provides relatively good predictions about energy demand in acceptable errors and high accuracy for electricity demand predictions.

Keywords
energy forecasting, spatial, neural network

Topic
Electrical Engineering

Link: https://ifory.id/abstract/uKk9x7j3aXHU

Corresponding Author
I Kadek Merta Wijaya

Institutions
a) Department of Architecture, Faculty of Engineering and Planning, Warmadewa University, Bali, Indonesia
*amritavijaya[at]gmail.com

Abstract
The orientation of luan and teben in traditional settlement layouts in Bali is characterized by directions of sacred (luan) and profane (teben) values. The orientation of luan is generally towards kaja (Mount Agung/the place of Gods) and kangin (direction of the sun rising) which is signified by sacred spaces namely the holy place (pura). While the orientation of the teben is towards kelod the direction of the sea or graveyard (setra). The traditional settlements in Pengotan Village which have settlement patterns are linear with sacred (luan) orientation towards Mount Batur (Kaja) and Gunung Abang (Kangin). The orientation towards Mount Batur and Gunung Abang is background by the history and origins of the Indigenous Village of Pengotan which is a resident who lives at the foot of Mount Abang in the Kintamani area. The pattern of Pengotan Village is extended from the kaja to the kelod which consists of three zones, namely the Utama (zone of sacred) as the space intended for shrines (pura), Madya as the space for residential housing units and the Nista zone (zone of profane) intended for the graveyard (setra). This pattern is repeats in clusters of residential housing units. This study aims to spatial study of luan and teben orientations in Indigenous Village Pengotan through an approach: (1) history of the Traditional Village Pengotan, (2) conception of the mountain as a sacred direction, (3) conception luan and teben on settlements in mountainous area, (4) general concepts of sacred and profane space and (5) conception of signifier and signified spaces in architecture. The method used is naturalistic interpretive in studying space in a conceptual (intangible) and concreate (tangible) context through empirical studies on sensual (observation), natives viewpoint, logic viewpoint (researcher-s viewpoint) and transcendental aspects. The results of this study are (1) spatial patterns based on luan and teben conception; (2) the signifier and signified system in space of luan and teben orientation and (3) the relationship between Mount Batur and Mount Abang as luan (sacred) orientation in the Pengotan Village.

Keywords
kaja and kangin, luan and teben, Mount Batur and Mount Abang, signifier and signified system, spatial patterns

Topic
Architecture

Link: https://ifory.id/abstract/beVPj24mgqkQ

Corresponding Author
Hamdan Sugilar

Institutions
1 Department Mathematics of Education, UIN Sunan Gunung Djati Bandung
2 Department Mathematics of Education, Universitas Pasundan

*rahayu.kariadinata[at]uinsgd.ac.id

Abstract
The purpose of this study was to determine the differences in the increase in students spatial thinking abilities; differences in achievement of spatial thinking skills based on students Early Mathematics (PAM) knowledge; and the difference in increasing the mathematical character of students between before and after mathematics learning using the Cabri 3D software with a scientific approach. This study uses quasi-experiment, the experimental class uses Cabri 3D software with a scientific approach and the control class uses conventional learning. The results showed that: there were differences in the increase in spatial thinking skills; there are differences in achievement of spatial thinking skills based on PAM and there is interaction between PAM categories of students with learning in achieving students spatial thinking skills; there is a difference in the improvement of students mathematical characters between before and after mathematics learning using the Cabri 3D software with a scientific approach. Mathematics learning using Cabri 3D software with a scientific approach is one alternative to improve spatial thinking skills and mathematical character of students

Keywords
scientific approach, spatial thinking, mathematical characters

Topic
Mathematics

Link: https://ifory.id/abstract/yxjDw4aKQURp

Corresponding Author
I Gede Pasek Mangku

Institutions
a) Food Science and Technology Faculty of Agriculture
Warmadewa Universtiy, Denpasar-Bali
*Email: pasek_mangku[at]yahoo.com

Abstract
During processing and storaging of strawberry products like puree were often found some problems such as loss or change of red colour anthocyanin, formation of brown pigment and loss of ascorbic acid. The purpose of this research is to determined the best of precise dextrin concentration to stabilitation of red colour anthocyanin pigment and the quality during storage at temperature 10±2oC for 30 days. Rendomized block designed used with dextrin concentration as treatments that consists of three levels with four replications. The treatments are, dextrin concentration 0,8%, 1,6%, and 2,4%. The data were analyzed using of ANOVA and continoued by LSD analyzed if the treatment given significantly effect. To get the best treatment used of effectivity index value. The result showed that the treatment of dextrin 1,6% having the highest of total product value 2,27 and produced strawberry puree with the best quality during storage at temperature 10±2oC for 30 days. The characteristics of the strawberry puree are anthocyanin concentration 23,67 mg/kg, total ascorbic acid 78,12 mg/100g, total soluble solid 13,23%, moisture content 79,88%, pH 3,16, red colour intencity (a* value) +30,80, degree of lightness (L* value) 35,40, and total of microba 21,6 x 103 sel/g.

Keywords
Strawberry puree, quality, anthocyanin, dextrin, storage

Topic
Industry Engineering

Link: https://ifory.id/abstract/tXCeH8RwgpFY

Corresponding Author
Kazi Arham Ahmed

Institutions
Department of Nuclear Science and Engineering, Military Institute of Science and Technology.
Mirpur, Dhaka-1216, Bangladesh.

Abstract
Many different types of nuclear power reactors are used for electricity generation. The current nuclear power plant is classified as Generation III or lower. Thermal hydraulics analysis plays an important role in design and safety features of a nuclear reactor. The thermal and hydrodynamic objective of the nuclear power plant design is to safely remove the heat generated in the nuclear fuel without producing fuel temperatures without closely approaching the hydrodynamic critical heat flux under steady-state or transient operating conditions. The present research represents a steady-state thermo-hydraulic analysis of in-house design 50 MWe small modular reactor (SMR). The main objective of this work is to ensure that all important thermal hydraulic parameters uphold margins far below the thermal safety margin limits. In this study, we have calculated fuel centre-line temperature, cladding surface temperature, bulk coolant temperature, power density, average heat flux, the departure from nucleate boiling (DNB) heat flux and DNB ratio. An analytical method has been used to calculate the above mentioned parameters by using a computer program based on C programming language. This method has been validated against the available literature values. It is found from our preliminary analysis that these parameters are within the thermal safety margin limits. Further works are in progress to perform thermal hydraulic analysis by using code such as PARET, RELAP, TRAC etc. to finalize the thermal safety margin limits for our conceptual design of SMR.

Keywords
SMR, Thermal Hydraulics, C program, Heat flux, DNBR

Topic
Physics

Link: https://ifory.id/abstract/xy9dfKgmJYAc

Corresponding Author
Ayu Latifah

Institutions
Department of Informatics, Sekolah Tinggi Teknologi Garut, Jl. Mayos Syamsu No. 1, Garut, Indonesia

Abstract
A new class of autonomous underwater vehicle (AUV) is hybrid underwater glider (HUG) that integrates buoyancy engine and propeller as main actuator. This kind of vehicle has multi-mode to act, that is glider and AUV mode that derive to mathematical model for longitudinal and lateral plane. To design steer control of HUG, the mathematical model derive to linier equation, and the variable controller is rudder for yaw control and main thruster for speed control of HUG. The method of control design are PID, there is PD for yaw controller and P for speed controller that are simulated using Simulink MATLAB to get response so that we can verified the dynamic model for steering control using waypoint desire. The results demonstrate dynamic response for lateral plane over waypoint on the surfaces of water.

Keywords
AUV; HUG; Steer control; linear; Simulink MATLAB

Topic
Electronics Engineering

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

Corresponding Author
Nunung Kurniasih

Institutions
(a)Department of Chemistry, Faculty of Sciences and Technology, Sunan Gunung Djati Islamic State University, Bandung 40614, Indonesia
(b)Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia
(c)Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Padjadjaran, Jatinangor 45363, Indonesia
(d)Central Laboratory of Universitas Padjadjaran, Jatinangor 45363, Indonesia
(e)School of Chemical Sciences, Universiti Sains Malaysia,11800 Minden, Penang, Malaysia
* Corresponding author: nunungkurniasih[at]uinsgd.ac.id

Abstract
Two steroid compounds, ergosterol peroxide (1) and stigmasterol (2) have been isolated from the stembark of Aglaia simplicifolia belong to Meliaceae family. The chemical structures of 1 and 2 were identified on the basis of spectroscopic evidence including UV, IR, NMR 1D, NMR 2D as well as mass spectra and by comparison with those previously reported spectra data. The cytotoxic effects against HeLa cervical cancer cell lines of the extracts and compounds were studied.

Keywords
Aglaia simplicifolia, steroid, HeLa cervical cancer cell lines.

Topic
Chemistry

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

Corresponding Author
ASRI SOLIHAT

Institutions
Universitas Garut

Abstract
Referring to the Government Regulation of the Republic of Number 79 of 2014 on National Energy Policy, the Indonesian government is committed to developing a renewable energy mix by 23% in 2025. However, the realization is still below 5%. This prompts the Garut Regency government to jointly commit to developing renewable energy by utilizing domestic waste for electricity generation. The purpose of this study is to design a strategic partnership in the development of a waste-to-renewable energy in Garut and analyze its social impacts. Data were obtained from Garut Environmental Office and Garut Bureau of Statistics and through interviews with related stakeholders. The results showed that the governments limitation in technology can be overcome by the involvement of the private sectors (investors from South Korea and Japan). Strategic partnership can help the Garut government realize their waste-to-renewable project.

Keywords
Strategic Partnership; Management Energy; Renewable Energy; Domestic Waste

Topic
Management Science

Link: https://ifory.id/abstract/9akvetUcJ32C

Corresponding Author
Galih Abdul Fatah Maulani

Institutions
Universitas Garut

Abstract
Anticipating the era of Society 5.0, communities and organizations are required to have integrated and comprehensive information access, including the management of mosques in Indonesia. This study aims at providing a strategic planning in the form of a portfolio for future application of mosques management information system services. This study was conducted with reference to Ward and Peppards strategic planning for information systems, which included SWOT analysis, value chain analysis, critical success factor method, balanced scorecard method, and McFarlans strategic grid. The results showed it is necessary for the mosque management to have several applications, mapped into 4 quadrants (strategic, high potential, key operation, and support). It is expected that this application portfolio can help managers of mosques in Indonesia provide faster, more accurate and more accountable information.

Keywords
Strategic Planning; Mosque Management Information Systems; Society 5.0

Topic
Management Science

Link: https://ifory.id/abstract/6CNkZHjDQ8qP

Corresponding Author
Asri Mulyani

Institutions
a) Department of Informatics, Sekolah Tinggi Teknologi Garut, Jalan Mayor Syamsu 1, Garut, Indonesia
*asrimulyani[at]sttgarut.ac.id
b) Department of Information Technology, Satya Wacana Christian University, Salatiga, Indonesia

Abstract
This research aims to plan a tourism information system implementation strategy to increase the number of visitors, with a case study on animal park tourism. Based on the evaluation of the organizations business processes with information systems that are running is considered not effective, the strategic planning of information systems is needed to help leaders and managers in carrying out their duties to improve work efficiency by automating the information management process, increasing management effectiveness by satisfying information needs for decision making, and improve competitiveness to improve the organizations competitive advantage by changing the style and manner of doing business. The methodology used by Ward and Peppard strategic planning model with the stages of analysis of Political Social Economy Technology, Strength Weakness Opportunities Threat, Mission Objective Strategy Tactics, Critical Success Factors, Balance Score Card, Value Chain, and Information System Strategy. The results of the research are in the form of a strategic framework and information system implementation plan and technology that is in line with the organizations business strategy plan.

Keywords
strategic plan; information system; tourism; ward and peppard

Topic
Information Engineering

Link: https://ifory.id/abstract/vVktDjBT8QuX

Corresponding Author
Sri Rahayu

Institutions
Department of Informatic Engineering, Sekolah Tinggi Teknologi Garut, Jl. Mayor Syamsu No. 1, Garut 44151, Indonesia

Abstract
Given the global competition that is increasing with the rapid information technology that has penetrated the world of information technology strategic planning education is a mandatory solution that must be considered by Muhammadiyah 2 Kadungora Vocational School located in the region. The focus of this research is to analyze the entire business process at Muhungadiyah 2 Kadungora Vocational School, and design strategic IS / IT. This research begins by explaining the external and internal business environment of Kadungora Muhammadiyah 2 Vocational School to determine the five power models and institutions that define success. Next is an analysis of the external and internal situation of IS / IT to find out the world technology trends and the current portfolio of application institutions. The next step is the strategy process (SI, IT, and SI / IT management), then the last level is to determine the future SI / IT applications of Muhungadiyah 2 Kadungora Vocational School. The results achieved are recommendations for the IS / IT application portfolio that must be owned by Kadungora Muhammadiyah 2 Vocational School

Keywords
APPLICATION PORTOFOLIO;COMPETITIVENESS;INFORMATION TECHNOLOGY;SYSTEM INFORMATION;STRATEGIC PLANNING;

Topic
Computer Science

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

Corresponding Author
Arie Wardhono

Institutions
Department of Civil Engineering, Universitas Negeri Surabaya, Kampus Unesa Ketintang, Surabaya 60231, Indonesia
ariewardhono[at]unesa.ac.id

Abstract
The use of fly ash as cement replacement material in geopolymer is able to overcome the environmental problems caused by the cement production process. One type of fly ash that is widely used is class C fly ash which has a high calcium content. However, the main issue of this materials is the low silicate content which is required in forming geopolymer matrix. The use of zeolite which has a high silicate content is one alternative to overcome this problem. This research aims to identify the effect of zeolit addition in strength of high calcium class C fly ash geopolymer mortar. The ratio of zeolit to fly ash was 5% : 95%, 10% : 90%, 15% : 85%, 20% : 80%, and 25% : 75%, respectively. The specimen was developed using the blended 12 molar NaOH and sodium silicate at room temperature. The results showed that the combination of 95% fly ash and 5% zeolit gives the highest compressive strength. The zeolit significantly affects the strength development rate of geopolymer and accelerates the setting time rate. This can be concluded that the mix of class C fly ash and zeolite can provide an alternative in geopolymer production at room temperature.

Keywords
Geopolymer mortar; High Calcium Class C fly ash; Zeolit; Strength properties; Setting time

Topic
Civil Engineering

Link: https://ifory.id/abstract/TAU3vaHudytx

Corresponding Author
Imam Ariffudin

Institutions
a) Guidance and Counseling Study Program, Universitas Kanjuruhan Malang
Jl. S. Supriadi No 48, Bandungrejosari, Sukun, Kota Malang
*imamariffudin[at]unikama.ac.id
b) Guidance and Counseling Study Program, Universitas Negeri Semarang
Jl. Sekarang, Gunungpati, Kota Semarang

Abstract
Academic stress is one of the negative emotional levels that can affect students physical, psychological, and academic performance. Thus, there needs to be an assessment media that utilizes technological developments but can still evaluate academic stress levels effectively and efficiently. The purpose of this study was to develop an android-based assessment media (Stress Meter) that is able to measure students academic stress levels. This study used research and development methods. Data obtained were analyzed descriptively using Delphi technique for media acceptance test, and also Confirmatory Factor Analysis test and Cronbach Alpha to test the validity and reliability of the instrument. The results of this study indicate that prototype of Stress Meter application has met the acceptability criteria and the instrument in it has passed the validity and reliability test. In conclusion, the prototype of Stress Meter application can be used by students as a media self-assessment and facilitate the performance of counselors in identifying the level of academic stress that students have.

Keywords
Android-Based Application; Assessment; Development; Stress Academic

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/wFhYTb9rPCHe

Corresponding Author
Ngia Masta

Institutions
a) Physics Education Program, Faculty of Education and Pedagogy, Universitas Kristen Indonesia
Jalan Mayjen Sutoyo No. 2, DKI Jakarta 13630, Indonesia
*ngia.masta[at]uki.ac.id
b) Physics Departement, Faculty of Mathematics and Natural Science, Univeritas Indonesia
Jl. Margonda Raya, Depok, Jawa Barat 16424, Indonesia

Abstract
This paper investigated the variation of structure and electrical properties of Lathanum Ferrite Oxide perovskite-based material. The A site of this perovskite dopped Mg, Sr, and Bi. The (La1-xAx)FeO3 samples were synthesized by sol gel method. For the present research study, the structure, of this material investigated by X-ray diffraction (XRD). For the surfaces and morphology structure this material, we are using Scanning Electron Microscopy (SEM), and then the electrical properties of this materials were investigated by using RLC Meter, the data plotted by using bode and nyquist plot. The optical band gap energy obtained by using Uv-vis spectroscopy and employed Kubelka-Munk method This lanthanum ferrite oxide-based perovskite has been reported as potential ionic conductivity materials at room temperature.

Keywords
Sol-gel, Perovskite, Structure, Band gap, ionic conductivity.

Topic
Physics

Link: https://ifory.id/abstract/wv8KhF9ENYAM

Corresponding Author
Erfan Handoko

Institutions
Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
In this paper, we report a simple method to prepare different concentrations in molarities Co-Ni doped BaFe10CoNiO19 films on the quartz glass substrates by ultrasonic spray pyrolysis. The Samples were prepared by dissolving iron nitrate (Fe(NO3)3.9H2O), barium nitrate (Ba(NO3) 2) in DI water while stirring at 70-80o C. In these solutions Fe/Ba ratios varied from 12 to 6. Precursor solution was sprayed onto the cleaned quartz plates previously heated to 150 – 200o C, using a sprayer and argon as carrier gas. For crystallization the films were annealed in a furnace at a temperature 1000o C for about 3 h in air. Crystal structure of the film was determined by X-ray diffraction using CuK radiation. The microstructure was examined by a JEOL JSM-5310LV scanning electron microscope. The magnetic properties were measured using a vibrating sample magnetometer. The substitution of Fe3+ ion by Co2+ and Ni2+ has changed magnetic properties of barium hexagonal films.

Keywords
BaFe10CoNiO19 films, ultrasonic spray pyrolysis, barium hexaferrite

Topic
Physics

Link: https://ifory.id/abstract/HFUrXQ7JVBCw

Corresponding Author
Hamdan Sugilar

Institutions
1 Department Mathematics of Education, UIN Sunan Gunung Djati Bandung
2 Department Physics of Education, UIN Sunan Gunung Djati Bandung

* hamdansugilar[at]uinsgd.ac.id

Abstract
The purpose of this study was to determine the ability of the mathematical structure sense and attitudes of students through learning with construct 2 and sticky notes. The design of this study was Quasi Experimental with a nonequivalent control group design model, the research subject of The first semester biology of education students who were studying elementary mathematics. The results showed that the low ability of students mathematical structure sense was caused by several factors including the low response of elementary mathematics learning students 43.24%, low ability of student symbol sense of students are 51, 64%, construct 2 needs to be developed to respond to students who have basic math learning difficulties 63.21%, and 74.56% of students state that sticky notes are easier to apply, understandable and more practical. The ability of the structure is influenced by the learning model and the media used

Keywords
Structure sense mathematics, instructional Media

Topic
Mathematics

Link: https://ifory.id/abstract/FGvgHa3jyRY4

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
Ade Suryanda

Institutions
Department of Biology Education, Universitas Negeri Jakarta
Jl. Rawamangun Muka, Jakarta, Indonesia

Abstract
This research inteant was to determine differences in the ecolitercy of natural sciences and social sciences. Ecoliteracy of students is needed to form a sustainable society, and a basic understanding of the ecology and principles of ecosystems is needed. Structure of Observed Learning Outcomes (SOLO) is used to find out the responses of students in their understanding of ecoliteracy. The research sample came from students majoring in natural sciences and social sciences academic year 2018/2019 in 3 Senior High School in Bekasi. The results showed that there were differences in the ecoliteracy of high school students majoring in science and social science that average ecoliteracy score of science students is 179 while the average ecoliteracy score of social studies students is 169. The level of SOLO taxonomy level of science students is at the relational and extended abstract level and the SOLO taxonomy level of the social students is at the multistructural level up to the extended abstract level. The conclusion of this study is that there are differences in the ecoliteracy of students from science and social studies subject to taxonomy Structure of Observed LearningOutcomes (SOLO).

Keywords
Ecoliteracy, Taxonomy SOLO

Topic
Biology

Link: https://ifory.id/abstract/WepKMh2aPj9G

Corresponding Author
Yuli Rahmawati

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

(b) SMA Bakti Mulya 400
Jl. Lingkar Selatan, Pondok Pinang,
Jakarta Selatan 12310

(c)Arief Setiawan
SMP Pembangunan
Jl. Pengayoman III No. 95, Utan Kayu Utara
Jakarta Timur

Abstract
The paper portrays the study of the integration of ethnopedology in wastewater treatment project to engage science students in learning environmental pollution. The study involved two classes in junior high school in Jakarta. The cultural practices in dealing with environmental pollution from five regions of Jakarta, Bandung, East Java, Central Java, and Banten have been integrated into the study. The qualitative research with multiple data collection of reflective journal, interviews, and science concept test. The project of wastewater treatment has been developed through the information of indigenous knowledge which has been explored. The results show that the ethnopedagogy integration in science learning has engaged students in understanding their cultural identity and developing their problem solving, critical and creative thinking skills. The science of conceptual understanding has been developed throughout the learning experiences. In addition to students have developed their skills in communication and collaboration with completing the project. The students faced the challenges of shifting their identity from passive to active learners within meaningful and enjoyable learning experiences.

Keywords
ethnopedagogy, science learning, environment pollution, wastewater treatment project, students engagement

Topic
Chemistry

Link: https://ifory.id/abstract/fEq2NuKFgzXU

Corresponding Author
Sri Aprilia

Institutions
1Chemical Engineering Department, Engineering Faculty, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
2Mechanical Engineering Department, Engineering Faculty, University of Abulyatama, Aceh Besar, Indonesia
*sriaprilia[at]unsyiah.ac.id

Abstract
Natural weathering of rice husk ash filled in polypropylene composite films has been investigated by exposing the samples to a tropical clime for 4 months with max-min temperature 22 - 30oC and relative humidity 75%. Rise husk ash filled in film composite polypropylene effect of filler loading was 1, 3, 5, 7 and 9% and compare with neat composite. The silica from rice husk ash was isolated with acetic acid. The silica content was analyzed by XRD, SEM and FTIR to show crystallinity, structure and functional group. The weathered film composites polypropylene was investigated before and after exposure and analyzed the morphology with FTIR and SEM. Mechanical test for the film composites polypropylene take place for tensile strength and percentages of elongation at break. The result show that the tensile strength and percentages of elongation at break decrease after natural weathering. The average tensile strength of film composites polypropylene decrease about 64.54 ± 17.50% and the elongation at break of film composites polypropylene decrease about 49.33 ± 15.28%.

Keywords
silica from rice husk ash, film composites polypropylene, morphology and mechanical test

Topic
Chemical Engineering

Link: https://ifory.id/abstract/DU6T3cq2ykrp

Corresponding Author
RINI SETIATI

Institutions
Petroleum Engineering, Trisakti University, Jakarta 11440, Indonesia

Abstract
Cementing process was not good can be caused by the poor planning of cement slurry carried out in the laboratory. Poor cementing certainly cannot meet the expectations and goals of the cementing process. The purpose of this study was to select the right and optimal cement composition by testing sodium lignosulfonate retarder additives for thickening time and compressive strength. The methodology used in this study was laboratory testing using class G cement. The addition of sodium lignosulfonate additive in this class G cement was obtained the highest thickening time value at a concentration of 1.5% temperature 150 ° F with a 240 minute test result.

Keywords
sodium lignosulfonat, G class cement, compressive strength, thickening time

Topic
Chemical Engineering

Link: https://ifory.id/abstract/jJBNbFPtGq7a

Corresponding Author
Sitti Nursetiawati

Institutions
State the University of Jakarta, Faculty of Engineering, Cosmetology Education, East Jakarta, Rawamangun 13220
*sitti-nursetiawati[at]unj.ac.id

Abstract
Bio-remediation is one technique to reduce environmental pollution and renew soil with the help of microorganisms and plants. The process carried out includes detoxification of toxic chemicals by cleaning the environment naturally and economically. This study aims to identify waste recycling, modification of ecology-based farming systems, and test traditional plants as a source of bioremediation. Then, bacteria and bioremediation results will be used as liquid fertilizer. Liquid fertilizers are processed through bioremediation techniques, then reused as nutrients for organic cosmetics plants. The research method is carried out qualitatively and its application is in a polluted environment. The research findings state that there is a positive impact on reducing environmental pollution, especially in reducing the volume of waste and the smell of garbage. Meanwhile, the success of bio-remediation in liquid fertilizer depends on the Hydrogen (H2) cycle. In addition to H2, there are carbon (C), sulfur (S), and nitrogen (N) during the bio-remediation process which encourages the bio-remediation of liquid organic fertilizer to be able to fertilize the plant source of organic cosmetics. Thus, cosmetics can be said to be organic as a whole.

Keywords
Bioremidiation technique, liquid fertilizer, organic cosmetics

Topic
Environmental Engineering

Link: https://ifory.id/abstract/EA6nZYb3rmKW

Corresponding Author
lailatus siami

Institutions
Environmental Engineering Departement, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia

Abstract
Water is an important component on earth which community need, especially for clean water consumption. Water treatment plant is one of the solutions as fulfillment of clean water needs that guaranteed quality, quantity and continuity. The aim of this research to determine the effectiveness of coagulants type in water treatment plant planning by using Blorong River as raw water in Semarang City, according to the requirements of water quality of drinking of health minister of Republic Indonesia 492/2010 law. The research using jartest methods by observing the influence of coagulants type consisting of poly aluminium chloride (PAC), alumunium sulfat and chemical mixing alum towards turbidity, pH, iron, zinc, copper, total suspended solid (TSS), and total dissolved solid (TDS) as a parameter observed in two different seasons. The influence of each coagulant also varied with several velocity gradients. It is expected can be specified coagulant type with the ability to decrease those parameters in accordance with drinking water quality requirements which has the most affordable price.

Keywords
Jartest, Poly Aluminium Chloride (PAC), Alumunium Sulfat, Chemical Mixing Alum, Velocity Gradient

Topic
Environmental Engineering

Link: https://ifory.id/abstract/WbngxEuKUV6w

Corresponding Author
Priska Choirina

Institutions
State Polytechnic of Malang

Abstract
Micro-expression recognition is one of the popular researches in analysing expressions on the face. Micro-expression is a facial movement that occurs in a short time and is difficult to identify manually by human eyes. In general research, facial landmarks are used to form a large size ROI for each facial feature for the feature extraction process. In this study, we utilize certain points in the face to trace the subtle motion of the face for the introduction of micro-expressions in the sequence of onset images to offset. The method of determining the landmark points to be compared is the Discriminative Response Map Fitting method and the Active Shape Model method. This research proposes to use 19 points in the area of the eyebrows, eyes, and mouth. To measure the subtle motion tracking of facial features in each frame tracking is done using the Kanade Lucas Tomasi method. The features obtained are the differences in coordinate values between frames, magnitude, and theta. We evaluated the method proposed in CASME2 and SAMM showed that using naive bayes is 74.6% and neural network is 63.5% classification accuracy in SAMM. In CASME2 using naive bayes is 79.6% and neural network is 61.1% classification accuracy.

Keywords
Micro-Expression;Feature Point; Active Shape Model (ASM); Discriminative Response Map Fitting (DRMF); Kanade-Lucas-Tomasi (KLT)

Topic
Computer Science

Link: https://ifory.id/abstract/azg3peDj97cT

Corresponding Author
Daryanto, M.T. -

Institutions
Electrical Engineering Education Study Program, Faculty of Engineering, Jakarta State University, Jakarta, Indonesia

Abstract
Delivery of electrical power from the power plant to the load center of widespread done through transmission networks with limited capacity. The operation of such an electric power system can cause a stable condition to be disturbed and a worse result is a total blackout. This study aims to investigate the influence of dynamic loads on the electric power system oscillation damping. The behavior of the electric power system after disruption studied to determine the effect of parameter changes the dynamic load of the electric power system oscillation damping. The electric power system model in this study is a dynamic load model and synchronous generator model. Dynamic load models are developed from the Hill model based on load power responses due to voltage changes. The mathematical formula that describes the interaction between voltage and load power is realized by first-order differential equations. While the electric power system model is based on a model developed by Demello, which is a single electric generator connected to an infinite bus. The synchronous machine in this model is obtained from the classical Park model by assuming that (1) the condition is balanced, (2) the stator coil resistance is ignored, (3) the influence of saturation is ignored, (4) the transmission network is assumed to be zero, and (5) the local load is assumed the voltage depends only on the real power. Based on the two models, an overall block diagram is made that illustrates the interaction between dynamic loads and the electric power system. The results showed that there was an increase in the stability of the electric power system with dynamic load feedback and a decrease in the rotor angle and increase in voltage. So that it can be concluded that changes in dynamic load parameters affect the stability of the electric power system.

Keywords
Keywords: damping, oscillation, dynamic load parameters, electrical power system, synchronous generators.

Topic
Electrical Engineering

Link: https://ifory.id/abstract/nc28yPjXFHh3