Indonesia Conference Directory

Corresponding Author
Farihin Lazim

Institutions
State Polytechnic Of Malang

Abstract
Image reconstruction of traffic signs serves to improve the image quality of traffic signs that are blocked by leaves or tree branches so that it can facilitate the process of detecting and recognition traffic signs. Inpainting is one of the image restoration methods to reconstruct images that have been damaged or the removal of unwanted objects where the area to be restored is based on information around the area. Criminisi introduces an inpainting method with an exemplar-based approach that combines the structure-oriented and texture-oriented scheme. While Hung popularized the Criminisi method and combined it with contour construction (bezier curve). The researcher tried to compare the two methods by using a number of images of traffic signs, one of them by using images with a size of 123 x 116 issuing the results of Mean Squared Error (MSE), the criminisi method gets results from MSE 69,70 while the hung method gets results from MSE 68,04 . Based on the reconstruction process of both shows the average hung method is smaller than the MSE results which means the closeness of the reconstruction results with the original image is closer to the hung method than the criminisi method.

Keywords
traffic signs, image reconstruction,image recognitions, curve bezier.

Topic
Computer Science

Link: https://ifory.id/abstract/cuzhKn9YEX3J

Corresponding Author
Ekananda Sulistyo Putra

Institutions
State Polytechnic of Malang

Abstract
This paper presents a study of long range (LoRa) communication for monitoring of a ship electrical system. Three categories of electrical system include generator, power distribution, and navigation are monitored. A low power communication technology of LoRa is used to transmit electrical variables such as current, voltage, and power are logged and sent to the server. Experiments using LoRa SX1278 and Arduino have been inducted to validate the performance of the communication. Three spreading factors 12, 7, 6 have been tested. From experiments results, the performance of the communication has been analyzed, if has been found that 97% successful data transmission was achieved with maximum distance. Furthermore, small baudrate communication was more suitable for the application.

Keywords
Long Range (LoRa) Communication; Monitoring; Ship Electrical System

Topic
Electronics Engineering

Link: https://ifory.id/abstract/Xfb2gcJDBaW4

Corresponding Author
Baso Maruddani

Institutions
a) Engineering Faculty, Universitas Negeri Jakarta
Jalan Rawamangun Muka, Jakarta Timur 13220, Indonesia
*basomaruddani[at]unj.ac.id

b) DJA Institute
Apartemen The Green Pramuka City, Tower Fagio
Jl. Jendral Ahmad Yani Kav. 49, Rawasari, Cempaka Putih, Jakarta Pusat 10570, Indonesia

Abstract
This study aims to evaluate the performance of Satellite Nusantara Satu which has just been launched. Satelit Nusantara Satu is a broadband satellite that uses High Throughput Satellite (HTS) technology and uses Ku-band transponders to cover all regions in Indonesia. However, the use of Ku-band frequencies in Indonesia, which is located at a tropical region, must be evaluated because of the characteristics of the Ku-band frequency are very vulnerable to rain attenuation. In general, a broadband service requires link availability of 99.9% with a minimum speed of 100 Mbps. Our simulation results show that in the western part of Indonesia, to reach 100 Mbps with 99.9% link availability, the EIRP of the earth station VSAT is minimum at 79 dBW. In the central part of Indonesia, to reach speeds of 100 Mbps with 99.9% link availability, the EIRP of the earth station VSAT is minimum at 83 dBW. And in the eastern part of Indonesia, to reach speeds of 100 Mbps with 99.9% link availability, the EIRP of the earth station VSAT is minimum at 84 dBW.

Keywords
Satellite; Ku-band; Broadband; EIRP; VSAT

Topic
Electronics Engineering

Link: https://ifory.id/abstract/b3B8nmTqxFjC

Corresponding Author
Yuliana Sy

Institutions
1) Graduate School of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111

2) Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111

Abstract
This study reports on the development, preparation and performance test of NbOPO4 solid acid catalyst for biofuel production from vegetable oil. NbOPO4 catalyst was synthesized by sol-gel method using NbCl5, H2SO4, and citric acid as the precursor solutions and chellating agent, respectively. This solid acid catalyst was developed by combination with NaOH as an active phase to provide reaction sites and increase the surface area of the catalyst. Dependent variables in the study were calcination time of 5 h; NbOPO4 loading of 2%; transestrification time of 3 h; reaction temperature at 65-70 Celcius and oil mass of 30 g. Whereas, the catalyst pH of 2, 4, 6, 9, and Na impregnation ratio of 20-50% were set as independent variables. The crystalline morphology of catalyst was analyzed by Scanning Electron Microscopy, and X-Ray Difractometer was used to characterize crystallinity degree of the catalyst. The performance of the catalyst was evaluated from a transesterification reaction for biodiesel production. The highest biodiesel yield of 98,5% was obtained in the reaction using catalyst with pH of 4 and Na impregnation ratio of 30%. The density obtained was 0,860 gr/cm3 confirming that the produced biodiesel complies to the SNI standard.

Keywords
solid acid catalyst, biofuel, transesterification, Na/NbOPO4

Topic
Chemical Engineering

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

Corresponding Author
Athaya Zhafirah

Institutions
(a*) Department of Civil Engineering, Sekolah Tinggi Teknologi Garut, Jalan Mayor Syamsu 1, Garut 44151, Indonesia
*athaya[at]sttgarut.ac.id
(b) Department of Civil Engineering, Politeknik Negeri Bandung, Jalan Gegerkalong Hilir, Bandung 40559, Indonesia

Abstract
The basic strength parameter that is important for use in designing pavement is the modulus of subgrade reaction (k). Increase in value of modulus subgrade reactions can be obtained by soil improvement using PVD (Prefabricated Vertical Drain). The method used to obtain the modulus of subgrade reaction value is a plate load test using plates with a diameter of 304.8 mm in soil conditions without PVD and with PVD with a distance of 100 mm and 150 mm. The results obtained from the plate load test are pressure and settlement data. The plate load test results are then graphed between pressure and settlement. The modulus of the subgrade reaction is based on a pressure of 69 kN/m2 which determines a certain settlement. The most significant increase in modulus of subgrade reaction from soil conditions without PVD was found in the condition of soil with 100 mm PVD, which is 80.73%. Whereas the condition of soil with 150 mm PVD has an increase of 56.24%. Based on this, soil with PVD with a closer distance gives a more significant increase in subgrade modulus of reaction.

Keywords
clay; PVD; modulus of subgrade reactions; plate load test; experimental

Topic
Civil Engineering

Link: https://ifory.id/abstract/v9Gwfdk7mauN

Corresponding Author
Demmy Dharma Bhakti

Institutions
(1.1) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(1.2*) Department of information technology education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
(2) Department of information system, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia

soraturaes[at]gmail.com

Abstract
This Ruangguru application study aims to determine the relevance of application functions based on the principles and paradigms of Human and computer Interaction (HCI). In this study, the aspects evaluated included aspects of human, technology, usability, and ergonomics. The interest in studying the Ruangguru application is based on several sources stating that Ruangguru is believed to be the best education platform. So from that sentences, it was examined several aspects to determine the extent of the relationship between the Ruangguru application and HCI principle. After the study was conducted, the Ruangguru application was assessed to have fulfilled these aspects. So its no wonder the Ruangguru application is used as an online learning center among Indonesian students.

Keywords
Ruangguru application, HCI

Topic
Computer Science

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

Corresponding Author
Mukhlissul Faatih

Institutions
a) Center for Research and Development of Health Resources and Services, NIHRD Indonesia
Jl. Percetakan Negara 29 Jakarta Pusat Indonesia
* faatih44[at]gmail.com
b) Center for Research and Development of Biomedical and Basic Technology of Health, NIHRD Indonesia

Abstract
The Indonesian Ministry of Health responsible for the supply and distribution of logistics needed in the implementation of the Immunization Program at national, provincial, district, and health facility levels. This study discussed cold chain management of vaccines from Provincial Health Office to the health center facilities and tested the vaccine potency. We have used a cross-sectional study involving a multistage sampling. Primary health centers, clinics and hospitals were selected from each two districts of eleven provinces. The data were analyzed descriptively and analytically using Chi Square Test. Vaccine potency test was carried out by Kendrick test. This study confirmed that the cold chain management of vaccines at the provincial level was better than the districts and health center facilities. The quality of Vaccine Vial Monitor (VVM) was in gradually decline from provinces to districts and health center facilities. Potency test results of DPT and polio vaccines suggested that all vaccines are still qualified in all study sample locations.

Keywords
vaccine vial monitor; potency test

Topic
Pharmacology

Link: https://ifory.id/abstract/UWdqNf2cQ6Fk

Corresponding Author
Anggara Budi Susila

Institutions
Department of Physics, Faculty Mathematics and Natural Science, State University of Jakarta, Jakarta 13220

Abstract
The synthesis of aluminum (Al) alloys, Al-Cu-Mg from mixture powder 88.4 wt% Al; 3.8 wt% Cu and 1.8 wt% Mg the adding 6.0 wt% up to 7.0 wt% of SiC on Al-Cu-Mg. After mixing the sample has been prepared by hot pressing process at a temperature of 350oC. After pressing sample has prepared by sintering one hour at a temperature 500oC and aging 16 hours. Al-Cu-Mg/SiC alloys samples has been investigated. The structure analysis were examined by X-Ray Diffractometer (XRD) and scanning electron microscope (SEM-EDX). The hardness was measured by hardness Vickers method. According to the results, it can be assumed that the 7 wt% of SiC content is prefer content to get better quality of hardness Vickers of Al-Cu-Mg alloys.

Keywords
Al-Cu-Mg/SiC, hot press, XRD, Hardness Vickers

Topic
Physics

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

Corresponding Author
I Gede Raditya Permana

Institutions
a) Faculty of Engineering and Technology, Sampoerna University, Jakarta 12780, Indonesia
*farid.triawan[at]sampoernauniversity.ac.id

b) Departemen Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi no 229 Bandung 40154, Indonesia

Abstract
Miura-origami pattern has taken interest of many engineers and mathematicians due to its unique foldability and wide range of engineering applications. However, its mechanical behavior is yet to be fully explored, especially when it is made by additive manufacturing (3D printing) method. In this paper, the compressive behavior of 3D printed lattice structure using the Miura-origami pattern is investigated. Polylactic Acid (PLA) material is used to make the specimen with various printing parameters, i.e infill pattern and density. Moreover, three kind of origami patterns with different folding angle and wall thickness are applied. Finally, the elastic, plastic, and fracture deformation behavior under compressive load is examined. The result is useful to develop a finite element model which can be utilized to comprehensively explore the mechanical behavior under complicated loading condition for various kind of engineering applications.

Keywords
miura-origami, 3D printing, finite element analysis, polyactic acid (PLA), deformation characteristic, material properties

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/Zbnq73WTtzgC

Corresponding Author
Samuel Christian Hidajat

Institutions
a) Faculty of Engineering and Technology, Sampoerna University, Jakarta 12780, Indonesia
*farid.triawan[at]sampoernauniversity.ac.id

Abstract
3D printing is considered as a highly convenient manufacturing process since it enables to create objects of many shapes, sizes and rigidity based on the material properties and the printing parameters. However, the mechanical properties of 3D printed materials is not yet fully understood. There are a lot of different printing parameter combinations which results in different mechanical properties and printing time. This research work aims to investigate the relationship between printing parameters, i.e. infill density and infill pattern, and tensile property of Polylactic Acid (PLA) material. Anycubic i3 Mega 3D printer is used to print the specimens and an open-source slicing software Cura is used to vary the printing parameters. The two varied printing parameters are infill densities of 25%, 50%, 75% and infill patterns namely Grid, Tri-Hexagon, and Concentric. The specimen and tensile testing procedure are based on ASTM D638 Type 1 standard. Three tensile properties, in this case, elastic modulus, yield strength, and tensile strength were examined. The obtained results can be used as a data reference for making finite element model (FEM) as well as predicting the optimum tensile property with respect to the printing parameters.

Keywords
3D printing; tensile property; printing parameters; infill density; infill pattern

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/HdrM6XE8N3gV

Corresponding Author
jamaaluddin jamaaluddin

Institutions
Universitas Muhammadiyah Sidoarjo

Abstract
The use of Fuzzy logic in the forecasting process, problem analysis and decision making of a process are often used. The development of this fuzzy logic by widening the foot of the membership function as interval fuzzy type 2, fuzzy signature or carried out hybrid between fuzzy logic and other artificial intelligence systems or hybrid algorithm has also got quite good results. At this time, a multilevel fuzzy logic method is proposed. This multilevel Fuzzy Logic is interesting behind the input of a process in fuzzy logic which is the output of the previous fuzzy logic or the output of a fuzzy logic analysis is input into the next stage of fuzzy logic. This multilevel fuzzy logic can be done up to several levels of depth according to the variables to be analyzed. If the final analysis has the equation X(i) + Y(i) = Z(i), then the value of X (i) can be the result of Z(i-1), where Z(i-1) is the result of the Fuzzy Logic X(i-1) + Y(i-1), by performing multilevel fuzzy Logic is expected to have the value of forecasting errors or problem analysis and decision making will be better and more precise.

Keywords
Fuzzy Logic, Multilevel Fuzzy Logic, Interval Fuzzy Type-2

Topic
Computer Science

Link: https://ifory.id/abstract/64nNhDVArMWt

Corresponding Author
beki subaeki

Institutions
a) Department of Informatic Engineering, Sunan Gunung Djati State Islamic University Bandung, Indonesia
* bekisubaeki[at]uinsgd.ac.id
b) Department of Information Communication Technologhy AEU, Malaysia
aedah.abdrahman[at]aeu.edu.my
c) Department of Information System, Syarif Hidayatullah State Islamic University Jakarta, Indonesia
syopian[at]uinjkt.ac.id
d) Department of Informatic Engineering, Sunan Gunung Djati State Islamic University Bandung, Indonesia
cecep.uinsgd[at]ac.id

Abstract
Researchers have done research on information systems before; because, the breadth of studies about IS. [1], [2] is an example of a study on how to measure Information System Success by testing instrument factors. Some researchers can produce different judgments regarding the success of implementation of IS; this is because the first definition of success of each researcher is changed, the two perspectives on success assessment, the three variables used, the four implementations in different environments. Several models can be used as references to assess the success of IS, Delone and McLean are examples that are widely used as references, which use six variables in measuring IS implementation. From the model used, later there will be a gap in determining the model, and this becomes an opportunity for the development of the model as follows. The development of models to measure information system success can be done by adoption, adaptation, and combination. This is legitimately valid as long as the development of the model is accompanied by supporting theories. The purpose of literature review can provide an overview of related to the method of previous researchers. Then it can be used as a framework for solving problems.

Keywords
success model, delone and mclean, is success, information system.

Topic
Computer Science

Link: https://ifory.id/abstract/jXA9MbfVkepB

Corresponding Author
Andri Ikhwana

Institutions
a) Department of Industrial Engineering, b) Department of Informatics Engineering
Sekolah Tinggi Teknologi Garut

Abstract
The sustainability of business activity is determined by the existence of all elements involved in business activity. Alignment of each component involved in business activities can be determined by identifying supporting factors based on activities in each business chain that occurs. This study aims to determine the supporting factors for the optimality of supply chain performance of brown sugar business activities using the supply chain management approach and supported by the analytical hierarchy process method in determining criteria that support brown sugar business activities. Based on the results of research on the supply chain of brown sugar business activities, to support the sustainability and optimality of supply chain performance the brown sugar business on the elements involved in the brown sugar business consists of several factors including product quality, the cost of purchasing brown sugar raw materials, and accuracy and the suitability of the number of shipments that are in accordance with the request.

Keywords
supply chain management, decision analysis, analytical hierarchy process

Topic
Industry Engineering

Link: https://ifory.id/abstract/TWQfzkEUcaA8

Corresponding Author
Dana Marsetiya Utama

Institutions
a) Departement Industrial Engineering, University of Muhammadiyah Malang, Jl. Tlogomas No. 246, 65144 Malang, East Java, Indonesia
*dana[at]umm.ac.id
b) Vocation Faculty, University of 17 Agustus SurabayaJl. Semolowaru, Menur Pumpungan, Sukolilo, Surabaya 60118 East Java, Indonesia

Abstract
Recently, the problem of minimizing carbon emissions in manufacturing has become a focus of much research. One of the efforts that were successfully carried out was managing the sustainable economics order quantity (SEOQ). However, several SEOQ had assumption such as (1) warehouse costs are ignored, (2) warehouse emissions are avoided, and (3) warehouse costs are ignored. In this paper, we developed the SEOQ model with warehouse costs and capacity limits. There are two proposed SOQ models. Model 1 was the SEOQ model with warehouse costs and carbon emissions. At Model SEOQ 2, this model considered warehouse costs, carbon emissions, and capacity. We also proposed procedures to minimize total inventory costs. Finally, a numerical experiment was conducted to test the model. Based on numerical experiments, the proposed model useful to solve SEOQ problems with warehouse costs and capacity limits.

Keywords
SEOQ; EOQ; carbon emissions; Inventory; capacity limits

Topic
Industry Engineering

Link: https://ifory.id/abstract/vYnpmcBAV6dF

Corresponding Author
Alwin Melkie Sambul

Institutions
Universitas Sam Ratulangi

Abstract
One of the challenges for the people who live in the rural islands of the developing countries is the lack of access to education. Although ICT (Information and Communication Technology) is increasingly regarded as an essential tool to support learning activities in rural areas, the availability of telecommunication infrastructure in such areas is still problematic, primarily because of high implementation cost and low revenue. This study aimed to develop an e-Learning model for the community in the rural islands which utilize ship to deliver to and receive data from the island using store-and-forward communication technique over a transient long-range wireless link established when the ship is at a certain distance from the island. Here we focused on the design of a synchronization method between databases of multiple learning management systems (LMS) between the ship and the island. The design has been implemented and tested using Moodle installed on low-power Raspberry Pi computers. The result showed that our design is suitable to be used in such requirements, hence making it a feasible solution to support ICT-based learning for the people in rural islands.

Keywords
Database synchronization; learning management system; store-and-forward; e-Learning; rural islands

Topic
Computer Science

Link: https://ifory.id/abstract/qGAgaceQhz4R

Corresponding Author
Arif Rahman

Institutions
1 Universitas Negeri Jakarta
2 Universitas Indonesia
3 Unika Atmajaya Jakarta

Abstract
The synthesis of LTA zeolite from kaolin Bangka using hydrothermal method at low temperatures has been reported. Kaolin was converted into metakaolin by calcinaton process at a temperature of 750 °C for 2 hours then hydrothermal subsequently process at 60 ° C for 5 hours in a NaOH 3M solution. Characterization by using XRD provides information on changes from the crystalline to amorphous phase in the conversion of kaolin to metakaolin to complete and the formation of LTA zeolite after hydrothermal. SEM provides information on morphological changes that are typical for Kaolin, metakaolin and zeolite LTA. Changes in functional groups were also observed in the samples observed using FTIR spectroscopy. From these characterizations, it can be concluded that successfully synthesized LTA zeolite from Kaolin Bangka with high crystallinity using a simple method.

Keywords
Zeolite LTA, Kaolin, metakaolin

Topic
Chemistry

Link: https://ifory.id/abstract/KzUFTv3DHRYy

Corresponding Author
Soni Setiadji

Institutions
[1]Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung, West Java, 40614, Indonesia.
[2]Department of Chemistry Education, UIN Sunan Gunung Djati Bandung, Jl. Cimincrang, Cimenerang, Panyileukan, Bandung, West Java, 40292, Indonesia.
[3]Master Program in Computational Science, Faculty of Mathematic and Natural Science, Institut Teknologi Bandung, Jl.Ganesha No. 10, Bandung, West Java, 40132, Indonesia

Abstract
NaX zeolite is a synthetic zeolites with faujasite framework that has large pores, which it is largely used as adsorbents. NaX zeolite was synthesized using silica which was extracted from elephant grass. The silica was isolated from elephant grass using its ash with conventional ignition method, with NaOH as solvent. The extracted silica purity is 86,33%. NaX zeolite was synthesized with 3.5 Na2O : Al2O3 : 2.9 SiO2 : 150 H2O as molar ratio in hydrothermal condition at 90 °C for 15 hours. Synthesized zeolite were then characterized using FT-IR to confirm the formation of zeolite based on chemical bonding that appears on the spectrum, XRD to confirm the framework structure of the formed zeolite, and SEM to obtain its morphology. Based on those analysis, it is known that the result of synthesis process is zeolite with NaX crystal structure and octahedral morphology with crystal sizes range 1-5 µm.

Keywords
silica extraction, elephant grass, zeolite synthesis, NaX zeolite, hydrothermal method

Topic
Material Science

Link: https://ifory.id/abstract/eNPYKBDtxX3R

Corresponding Author
Citra Deliana Dewi Sundari

Institutions
1Department of Chemistry Education, UIN Sunan Gunung Djati Bandung, Jl. Cimincrang, Cimenerang, Panyileukan, Bandung, West Java, 40292, Indonesia.
2Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung, West Java, 40614, Indonesia.
3Master Program in Computational Science, Faculty of Mathematic and Natural Science, Institut Teknologi Bandung, Jl.Ganesha No. 10, Bandung, West Java, 40132, Indonesia

Abstract
Silicalite-1 is a type of zeolite with no aluminum content and is hydrophobic. This zeolite can be synthesized from various types of silica. Elephant grass (Pennisetum purpureum) is one of the potential agricultural wastes that has a fairly high silica content that can be used for zeolite synthesis. In this study, silicalite-1 zeolite was synthesized using silica extracted from elephant grass and tetrapropilammonium bromide (TPABr) templates. Silica samples extracted from elephant grass have 71.91% amorphous SiO2 content. Silicalite-1 zeolite was synthesized with mole ratio of 1SiO2 : 0.527TPABr : 0.395Na2O : 98.45 H2O, using hyrothermal method at 180°C for 24 hours in a stainless steel-teflon lined autoclave. The resulting silicalite-1 samples were confirmed by X-Ray Diffraction (XRD) and showed 2θ which was typical for silicalite-1 i.e. 8.02°, 8.93°, 23.09°, and 23.98°. The results of Scanning Electron Microscopy (SEM) show that silicalite-1 zeolite has hexagonal crystals with 43.36 µm size as a result of the calculation using the Schrerrer method.

Keywords
silica isolation; amorphous silica; elephant grass; tetrapropilammonium bromide; silicalite-1 zeolite

Topic
Chemistry

Link: https://ifory.id/abstract/UTkpz7df4EAw

Corresponding Author
Dini Handayani

Institutions
Universitas Pendidikan Indonesia
Jl. DR. Setiabudhi No.229, Isola, Sukasari, Kota Bandung, Jawa Barat 40154
Sekolah Pascasarja Prodi Pendidikan Khusus

Abstract
This study aims to find out how to teach calculating the area of ​​blankets, tube volumes, and cones for middle-aged deaf students. This study uses the single subject method. The research subjects were 4 second grade students of junior high school in a special school in Bandung Regency. The research data was taken by pre-test and post-test. Teaching uses total communication and explanation. The results of the study show that calculating the area of ​​blankets, volume of tubes, and cones for deaf students should be given examples and giving as many questions as possible. Giving examples and questions must be various types so students can understand

Keywords
deaf, cone, tube

Topic
Mathematics

Link: https://ifory.id/abstract/zBXmZYA4D2Ny

Corresponding Author
Dini Handayani

Institutions
Universitas Pendidikan Indonesia
Jl. Dr. Setiabudhi No. 229 Bandung 40154 Jawa Barat - Indonesia
Sekolah Pascasarjana Prodi Pendidikan Khusus

Abstract
The research aims to find out how to teach how to measure acidity using universal indicators on instant drinks at a stall near the school for deaf SMALB students. This research method uses a single subject approach, namely in special schools in Bandung Regency in the SMALB Tunarungu unit whose students are four people. Retrieval of data using pre-test and post test. Teaching with total communication and demonstration. The results of the study show that teaching how to measure acidity can be given to deaf students by demonstrating and explaining clearly the function of acidity indicators. The key to teaching deaf students is to provide a detailed explanation of each word given.

Keywords
Acidity, Universal Indicator, Deaf

Topic
Chemistry

Link: https://ifory.id/abstract/wZY9yPu4G7RU

Corresponding Author
Rusmono Rus

Institutions
UNIVERSITAS NEGERI JAKARTA

Abstract
Education and technology must run together in this millenial century. This study aims to develop teaching materials based on mobile learning for thematic learning in elementary school. This study uses research and development methods by Dick and Carey model. The instruments used in this study were interviews, questionnaires, and tests. The result of this study are teaching materials based on mobile learning. Based on the results of the pre-test and post-test analysis, it showed that there were differences in learning outcomes between the pre-test and post-test stages. The results of the t-test show that t count = 12.10 and t table = 1.99 at the significance level α = 0.05 / 95%. Thus it can be concluded that there is an increase in learning outcomes experienced by students, after participating in thematic learning with teaching materials based on mobile learning.

Keywords
teaching materials, mobile learning, alam sekitar.

Topic
Biology

Link: https://ifory.id/abstract/xW9hQLJGjNdK

Corresponding Author
Hapsari Dewi

Institutions
Universitas Indonesia
Jalan Kampus UI, Kukusan, Beji, Kukusan, Beji, Kota Depok, Jawa Barat 16424
chairul.hudaya[at]gmail.com
hapsamarwa[at]gmail.com

Abstract
Induction motor slip ring-type technology has been widely used in industrial as one of crucial electrical components to convert energy mechanically. The construction of this motor is more complex than other standardized induction motors such as squirrel cage. The complexity lies on the connection between the rings and brushes which requires more maintenance. Meanwhile, Squirrel cage motor that is supported by a VSD system allows its user to start motor smoothly and adjusts the speed more efficiently. In this study, we exclusively investigate the possibility of the outdated technology replacement by using squirrel cage standardized induction motor based on its compatibility and the financial perspective as well. To prevent any coming up problems, the selections of new motor and VSD must fulfill the requirement of the existed system. Technical data were collected from customer-s SCADA and nameplates While the financial calculation was made based on payback period. In this case, the payback period is projected within two years that basically depends on operation patterns. According to our point of view, standardized squirrel cage motor potentially replaces the slip ring motor in which squirrel cage motor is not only for having simple operation but also less maintenance and energy cost.

Keywords
Induction Motor, Variable Speed Drive (VSD), Energy Saving, Payback Period

Topic
Electrical Engineering

Link: https://ifory.id/abstract/2u8VywNU9LjY

Corresponding Author
Rini Puspitaningrum

Institutions
1Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Indonesia 10520
2 Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Indonesia

Abstract
Aging getting more attention in meetings both in between scientists as public. Long telomeres on lymphocytes able predict the aging process and related to change telomerase function. This research aimed to measure levels telomerase enzyme on lymphocytes cell with age 6-8 weeks and 2-3 years. This research used experimental method. This researchwas conductedon February-May 2018 in Laboratory Biochemistry and Biology Molecular Faculty Medical University of Indonesia. Based on the research that has been done, the level of telomerase enzyme in Rattusnorvegicus lymphocytes within age 6-8 weeks had an average 2.24 ± 0.09 pg / mL lymphocyte. Telomerase enzyme levels in lymphocytes aged 2-3 years had an average 2.27 ± 0.15 pg / mL.This research obtained accurate information that can be used to find out each individual who doesn-t show the same level at the same time, was not statistically significantly different. This is an interesting thing to do for a more heterogeneous environment and by paying attention to individuals per individual from various daily activities.

Keywords
Aging , telomerase enzyme, lymphocytes, cell degeneration

Topic
Biology

Link: https://ifory.id/abstract/dhQFRMaCvA38

Corresponding Author
Agus Setyo Budi

Institutions
aDepartment of Physics, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia
bDepartment of Physics Education, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia

Abstract
The aim of this research to investigate the influence of temperature and additive effect of coconut shell charcoal on the density and porosity of ceramic membranes based on zeolite and soil. With the addition of additives in the form of charcoal can reduce the density of ceramic membranes. It can also increase porosity of ceramics and clay based zeolite membranes. The results of the study show that based on the results of the Scanning Electron Microscopy (SEM), it can be seen that the largest pore size is owned by samples containing 80% zeolite and 10% additional. The number of pores produced depends on how much additive content is contained in the sample. The conclusion is that there is a tendency for the temperature to rise and the more additives contained in the sample, the more pores produced.

Keywords
Temperature; additive coconut shell charcoal; density; porosity.

Topic
Material Science

Link: https://ifory.id/abstract/GmABPfLEYy6R

Corresponding Author
Agus Setyo Budi

Institutions
aDepartment of Physics, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia
bDepartment of Physics Education, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia

Abstract
In this research, we investigate the mechanical behaviour of zinc sodium phosphate glass system with the various concentration of chromium oxide doped. The glass system was synthesized using the melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. Longitudinal and shear ultrasonic velocities were measured in different compositions of the glass system at temperature range between 270 K and 323 K. From the transit time data and density, we found that all the mechanical behaviour for these glasses decrease as the Cr2O3 content increase, which indicates a weakening of the binding energy in the network.

Keywords
Chromium oxide, Ultrasonic velocities, zinc sodium phosphate glass

Topic
Material Science

Link: https://ifory.id/abstract/M9zRQV2wd4XT

Corresponding Author
Fauzi Bakri

Institutions
a) Department of Physics Education, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia
*fauzi-bakri[at]unj.ac.id

Abstract
Radiation concept in Nuclear subject in Physics Learning include some devices, such as: Geiger Muller counter, Wilson cloud chamber, scintillation detector. The aim of this research is to visualizes the radiation concept from that devices using augmented reality technology. The result show the 3-D animation can: describe the mechanism of the Geiger muller counter detector to detect radiation; describe the mechanism of Wilsons fog chamber detects radiation; and describe the mechanism of the scintillation detector tool to detect radiation. All the markers developed get a decent value to be used as a medium for learning physics about radiation concept.

Keywords
Augmented Reality technology, radiotion concepts, 3D Animation

Topic
Computer Science

Link: https://ifory.id/abstract/UL6nV3Tmpu2K

Corresponding Author
Handjoko Permana

Institutions
a) Department of Physics Education, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia
*handjoko[at]unj.ac.id

Abstract
Augmented Reality is a technology that can provide positive perceptions of lessons, improve learning experiences, and improve learning achievement. It visualizes the phenomenon obtained by the results of laboratory research. This research was to design and develop the marker of radioactive concepts. The stages consist of determine the instructional needs and goals, develop the markers, and evaluate from peers. We generate two markers for this concept: radioactive light penetration and radioactive light beam by electric field. The markers were developed based upon the identification of instructional needs and expected to assist in the achievement of the instructional objectives. The peer assessment results indicate that the marker design on radioactive concepts supports the physics learning through technology-rich environment.

Keywords
Augmented Reality, radioactive concepts, 3D Animation

Topic
Computer Science

Link: https://ifory.id/abstract/x8ve7B3YRHJa

Corresponding Author
Diah Ambarwulan

Institutions
a) Department of Physics Education, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia.
*dmuliyati[at]unj.ac.id
b) Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta 13220, Indonesia.
c) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jl. Ganesa No. 10, Bandung 40132, West Java, Indonesia.

Abstract
Granular particles have wide applications in various industrial fields, one of which is the beauty industry. One important part of this industry is the character of powder-size interactions with porous skin surfaces. This interaction can be modeled by the interaction of granular particles with a porous surface. Simulation that has been done can visualize the process of granular attachment on a horizontal porous surface. This simulation is 3-dimensional visualization using uFlex assets on unity software. The surface system is arranged in 3 pore sizes. Each surface is tested using 5 granular particle sizes. The results showed that the particles entering the porous surface system were influenced by the falling speed, porous hole diameter, coefficient of granular restitution and collision between granular particles.

Keywords
granular particle, porous surfaces, uflex unity assets

Topic
Computer Science

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

Corresponding Author
Fauzi Bakri

Institutions
Physics Education Department, Universitas Negeri Jakarta

Abstract
Visualization of abstract concepts will facilitate the understanding of physics concepts. The concept of abstract Lorentz styles can be simulated in three dimensions with augmented reality technology. A simulation is produced which displays the Lorentz style concept by making changes to magnetic field variables and flowing currents. The simulation has succeeded in providing a description of the relationship between the magnetic field and electric current which is directly proportional to the Lorentz force.

Keywords
physics simulation, lorentz force, augmented reality

Topic
Computer Science

Link: https://ifory.id/abstract/df2zE7P9NFwT

Corresponding Author
Pauhesti Pauhesti

Institutions
Teknik Perminyakan Fakultas Teknologi Kebumian dan Energi
Universitas Trisakti

Abstract
Drilling mud have a very important role in a drilling operations, start over drilling until it reaches the depth of the intended. In the importance of drilling mud, therefore there should have an analysis of potential problems that might happen in the process of the drilling. The Problems that might happen in the process of drilling one of them is about the loss circulation. To overcome the problem of lost circulation mud , one example is a method of loss circulation material (LCM).There were different LCM category but in this study used Kwik seal and the midrib bananas as an ingredient LCM. Both of them have the fibrous having the nature of stiffness so it can clog the pores. In research was done three times experiment with the additional kwik seal and adding different banana midrib .This study using specification of physical properties and rheology standard of a mud field drilling to get results like the environment actually on the ground .The results of research is expected us to know how much composition kwik seal or the midrib bananas to be added to the mud and effective to overcome lost circulation .

Keywords
kwik seal , banana midrib , fibrous , drilling mud, LCM

Topic
Material Engineering

Link: https://ifory.id/abstract/BhNtHPL3CZ72