Indonesia Conference Directory

Corresponding Author
Farah Ayu Ridhani

Institutions
a) Department of Civil Engineering, Faculty of Engineering, University of Indonesia
Jalan Kampus UI, Kukusan, Beji, Depok, Jawa Barat, 16424
Indonesia

Abstract
There are a lot of direct methods to estimate bearing capacity of pile foundation using cone penetration test (CPT). Hence, it is interesting to evaluate which method that suitable for a certain condition or specific locations. This paper tries to analyse the results of CPT direct method calculations for the pile foundations that were constructed in Jakarta, Indonesia. The pile capacities are determined using the following methods: Schmertmann, de Ruiter dan Beringen, LCPC, Aoki and De Alencar, Penpile, Price and Wardle, Philipponnat and Wesley. The pile capacities will be compared to the measured pile capacities from static pile load tests,which interpreted by Chin method and Decourt method, and the results from PDA testing. The statistical analyses used in this paper are the best fit line of the predicted pile capacities versus the measured pile capacities, and the mean and standard deviation of the ratio between the predicted pile capacities and the measured pile capacities. In general, the result of the CPT direct methods calculations are mainly underpredicted. Results showed that Philipponnat is the most appropriate method in the studied location with average value of ratio between the predicted pile capacities and the measured pile capacities is roughly 1.03.

Keywords
direct method; cone penetration test; pile foundation

Topic
Civil Engineering

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

Corresponding Author
Abdul Aziz Faisal

Institutions
a) Department of metallurgical and materials engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Indonesia 16424
*anne[at]metal.ui.ac.id

Abstract
At present, the combination of metal matrices and ceramic reinforcement as composite is popular for creating materials with good mechanical properties. Aluminum is used as a matrix because of its lightweight, ductile, and low melting point. In this paper we discuss the effect of adding silicon nitride reinforcement to AC4B aluminum. Five sample variations were made based on fraction volume percent (1, 3, 5, 7, 10) which were fabricated through stir casting method. In the fabrication process the magnesium element was added to increase the wettability, TiB grain refiner, and modification with strontium element. The samples made got destructive, tensile, impact, and hardness testing to determine the mechanical properties of the composite. Observation of phases, elements, compounds and microstructure was done to see the distribution of reinforcing particles in the aluminum matrix and the estimated phases formed. The results showed that the optimum tensile strength of variable occurred at the addition of 1% volume of silicon nitride with a strength value of 104.94, and the optimum hardness value was at the addition of 3% Si3N4, which was 44.8 HRB. The phases formed in the composite were Mg2Si, Al2Cu, β-Al5FeSi, and π - Al9FeMg3Si5 phases.

Keywords
AC4B; Micro Si3N4; Stir Casting

Topic
Materials Science

Link: https://ifory.id/abstract/WHjwvf3cgUNu

Corresponding Author
Adinda Dita Dwi Lestari

Institutions
a) Metallurgy and Materials Engineering, Universitas Indonesia, Jalan Kampus UI, Depok 16424, Indonesia
*adinda.dita[at]ui.ac.id
b) Metallurgy and Materials Engineering, Universitas Indonesia, Jalan Kampus UI, Depok 16424, Indonesia
*anne[at]metal.ui.ac.id

Abstract
The fabrication and research of Aluminum AC4B matrix composites with the addition of Boron Carbide (B4C) reinforce was carried out with the aim of knowing its mechanical properties difference due to its toughness, good impact resistance, and high strength properties. In this fabrication and research, Aluminum AC4B act as the matrix in the composites which is given a variation of B4C reinforcement particle of 1 ; 3 ; 5 %Vf and also followed by the addition of 5 %wt Magnesium (Mg) as the wetting agent, 0.04 %wt Stronsium (Sr) as the modifier, and 0.15 %wt Al-5Ti-1B as the grain reinforcement through the stir casting process. To characterize each composites, two types of testing methods are carried out namely the destructive testing (such as tensile, hardness, impact, and ballistic testing) and the non-destructive testing (such as porosity and density, Optical Microscope (OM), Scanning Electron Microscope (SEM) and Dispersive X-Ray Spectroscopy (EDX), and X-Ray Diffraction (XRD) testing). The mechanical properties difference of each composite is related to the interface bond between the matrix and the reinforcement added to the composites as the use of B4C reinforcement particle increase, so that it could produce high toughness, impact resistance, and strength.

Keywords
Aluminum composites; Boron carbide; AC4B; Stir casting

Topic
Metallurgy Engineering

Link: https://ifory.id/abstract/x8GzJXh2pgYw

Corresponding Author
Fachri Munadi

Institutions
1) Department of Chemical Engineering, University of Indonesia
Jalan Fuad Hasan, Pancoran MAS, Kukusan, Beji, Kota Depok 16424, Indonesia
*Corresponding author: dsupramo[at]che.ui.ac.id

Abstract
Crude oil refineries in Indonesia produce much waste in the vacuum distillation as vacuum residue, but its utilization is still low. As heavy oil residue, vacuum residue contains high aromatics and therefore high carbon which can be utilized as raw material to produce high surface area activated carbon (AC). Such a AC is widely used in the field of gas storage and electric double-layer capacitors (EDLCs). Electric double-layer capacitors (EDLCs) with activated carbon electrodes are known to have higher capacity for energy storage. Vacuum residue containing isotropic aromatics can be pyrolysed to form anisotopic aromatics which has high crystalline content thus increasing mechanical strength of AC. In the present work, vacuum residue was mixed with dehydrated castor oil as conjugated double bond source, then followed by pyrolysis at heating rate of 5°C/min until 450°C and holding time at 450°C for 90 minutes. The amount of dehydrated castor oil added to vacuum residue was varied at 0%, 5%, 10%, and 15% weight of vacuum residue. Castor oil can be obtained from castor oil plants, which are widely grown in Indonesia, by extraction process of castor bean. Dehydration of castor oil used a catalyst of sodium bisulfate to obtain conjugated double bonds. Co-pyrolysis of vacuum residue and addition of conjugated double bonds reduce C/H atomic ratio precursors, from 1.82 to 1.50, 1.48, and 1.45. Product of co-pyrolysis of vacuum residue and dehydrated castor oil was used as a precursor to prepare for activation and carbonization. The activation was conducted by activating the precursor with KOH solution and followed by carbonization at heating rate of 5°C/min until 700°C and holding time at 700°C for 30 minutes. The results show that the addition of castor oil by 0%wt, 5%wt, 10%wt, and 15%wt improved pore surface area from 150.32 m2/g, 236.97, 290.99, and 357.78 m2/g.

Keywords
Mesophase Pitch, Dehydrated Castor Oil, Vacuum Residue, Pyrolysis.

Topic
Materials Science

Link: https://ifory.id/abstract/cuPnA4ewy6Mq

Corresponding Author
Ahmad Shulhany

Institutions
1)Departement of Civil Engineering, Faculty of Engineering, Universitas Sultan Ageng Tirtayasa
2)Mathematics lecturer, UIN Sultan Maulana Hasanuddin
3)Departement of Mechanical Engineering, Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Abstract
Concepts connect the minimum number of passwords needed with the security system are monochromatic connectivity and rainbow connectivity. Rainbow connectivity has been introduced by Chartrand, et al. (2008), and monochromatic connectivity has been introduced by Caro and Yuster (2011). The focus of this paper is G, which is a simple, trivial, undirected, and 4-connected graph. Let s, and n be natural numbers, G is an ordered set of vertices set V(G) and edges set E(G), a 4-connected graph with order n. A coloring function d:E(G)→[1, s] is called rainbow edge s-coloring, if each pair of vertices u and v in V (G) has 4 internally disjoint u-v paths that have different colors or rainbow paths. The minimum number of colors needed so that each pair of vertices u and v in V(G) has 4 rainbow u-v paths called rainbow 4-connection number, rc4(G). Furthermore, the monochromatic u-v path is a u-v path that has the same colors. The monochromatic connection number, cr(G), is the minimum colors needed so that each pair of vertices u and v in V(G) has a monochromatic u-v path. In this paper, we show rc4(G) and cr(G) on some special graphs.

Keywords
4-connected graph, monochromatic connection number, rainbow connection number

Topic
Electrical Engineering

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

Corresponding Author
Hendrian Budi Bagus Kuncoro

Institutions
(a) Civil Engineering Department, Sultan Ageng Tirtayasa Univeristy, Cilegon - Banten, INDONESIA
*hendrianbudibk[at]untirta.ac.id
(b) Civil Enginering and Environmental Department, Gadjah Mada University, Yogyakarta, INDONESIA

Abstract
Bamboo is a natural material that in a great demand in the field of simple construction, so connection is one of the things that need to be considered. Research on bamboo connection has been carried out using bolts, steel gussets with wood or mortar fillers, and Fiber Reinforced Polymer (FRP). The use of FRP has advantage since FRP is light, strong, and has adequately high stiffness. This research uses two types of perpendicular connecton to fiber (TLS) with two layers methods, different number of layers, and two bolts which function as lateral connection. The used connection testing method is quasi-static monotonic loading. From the results of the study it is found that TLS01.2L increased the maximum load by 80,05 percent compared to TLS01.1L, while in TLS02.2L there is a decrease of 20,65 percent compared to TLS02.1L. In addition, the average ductility value is 2,63 for TLS01 and 2,11 for TLS02 so the stiffness value only reaches 1,75 for TLS01 and 1,97 for TLS02. It can be concluded that the numbers of layer does not affect the strength of the TLS connection but rather the FRP bonding area and the windings method which influences the strength and stiffness of the connection.

Keywords
Experimental; Wulung Bamboo; Perpendicular Fiber Joints; Fiber Reinforced Polymer

Topic
Civil Engineering

Link: https://ifory.id/abstract/VTeDaBpJ2vgE

Corresponding Author
Zulmahdi Darwis

Institutions
Universitas Sultan Ageng Tirtayasa

Abstract
Structure failures often happen whether caused by bad planning or implementation, especially at a reinforced concrete bar. Failures on building structure elements might be caused by several factors such as planned age of use, transformation on building function, and even improper construction procedure or method. Thus, the reinforced concrete bar strengthening is required especially on a 10 m bar. This study focus is comparison on strengthening the original structure of the building using the CFRP method which overlaying the bar surface, adding the IWF bar as a cantilever from below of the desired structure, and enlarging the bar dimensions. The result of the study shows that using 5 m2 CFRP overlayed on flexible reinforcement and 2.5 m2 CFRP overlayed in shear reinforcement results in Mn = 207.82 Knm and Vn = 146.33 Kn. Furthermore, additional 400,400,13,31 IWF bar for the strengthening result in Mn = 1045,32 Knm and Vn = 809,79 Kn. Finally, the dimension enlargement to 650 mm x 350 mm of 4D16 reinforced concrete and P10-250 mm reinforced cross-bar result in Mn = 529,23 Knm and Vn = 78,56 Kn. Effectiveness analysis is done to select the most effective method considering its strength gained and the cost required.

Keywords
Concrete Bar, CFRP, IWF Steel, Dimension Addition

Topic
Civil Engineering

Link: https://ifory.id/abstract/Mngx2qavYwZu

Corresponding Author
Sirojuddin Abbas

Institutions
a) Department of Mechanical Engineering, State University of Jakarta
b) Design Laboratory of Mechanical Engineering, State University of Jakarta

Abstract
The purpose of this research is to find out the best blade profile to increase power of banki water turbine. In this research the blade profile will be made in 5 variants. Variant P1 as a standard and other 4 variant P2, P3, P4 and P5 are the modification profile.The observation focus on output power and flow line contour inside runner of the turbine. The experiment was conducted by CFD software simulation. Head of the water is 5.5 m and discharge 2 m^3/min. Based on the simulation, test result shows that variant P2 is the highest with power increase 10.5 % compare to variant standard P1 and the best flow line countour compare to others.

Keywords
blade profile; banki water turbine; increase power; flow line

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/ZL8aTXRDtphq

Corresponding Author
Muthia Elma

Institutions
1 Chemical Engineering Departement, Faculty of Engineering, Lambung Mangkurat University, Banjarbaru, 70714, Indonesia
2 Environmental Engineering Departement, Faculty of Engineering, Lambung Mangkurat University, Banjarbaru, 70714, Indonesia
3 Material and Membrane Research Group (M2ReG), Faculty of Engineering, Lambung Mangkurat University, Banjarbaru, South Kalimantan, Indonesia 70714

Abstract
Natural Organic Matter (NOM) content in peat water is a major problem of membrane fouling in ultrafiltration (UF). For that, two stages adsorption as pre-treatment was employed to minimize the membrane fouling of NOM content. This research were carried out to investigate the effect of two stages adsorption on ultrafiltration performance for NOM removal that remains in peat water. This method was using powdered activated carbon (PAC) dosage of 80, 160, 240, 320, 400, 480, 560, 640, 720, 800, 880 dan 960 mg L-1. Then, Polysulfone (Psf) material was employed for Ultra filtration process. Membrane was applied in a dead-end mode with various operating pressure (1; 1.5; 2; 2.5; 3 bar). As a results, the optimum dose of PAC was 800 mg L-1 with dosage ratio of 0.75:0.25. Two stages adsorption-UF PSf provided the range from 86.9 to 92.8% of KMnO4 and 74.1-88.1% of UV254. For the experimental condition of 3 bar, the highest flux was achieved up to 39.919 L h-1 m-2.

Keywords
Natural organic matter fouling, peat water, polysulfone, two stage-adsorption, ultrafiltration

Topic
Chemical Engineering

Link: https://ifory.id/abstract/n8NL9krUhHJw

Corresponding Author
Denni kartika Sari

Institutions
University of sultan Ageng Tirtayasa

Abstract
Kappahycus alvarezi is one type of red seaweed containing kappa carrageenan. Lontar beach in Banten province is one that produce red seaweed In Indonesia. An important factor affecting the production of refined carrageenan is the temperature and extraction method. In this study Refined carrageenan extracted from kappahycus alvarezi using ultrasonic irradiation originated from lontar beach has never been studied. The objective of this research was determining the effect of temperature using ultrasonic irradiation and conventional extraction. The result indicated that higher temperature resulted in the increase of the carrageenan sulfate content, gel strength, moisture and ash content. The carrageenan moisture content demonstrated a fluctuated value due to temperature variation. This study suggested extraction process in 70 oC

Keywords
Kappahycus alvarezi, ultrasonic, red seaweed

Topic
Chemical Engineering

Link: https://ifory.id/abstract/6vA7tq3C4rJb

Corresponding Author
Yoshi Dessiani

Institutions
School of Strategic and Global Studies, University of Indonesia

Abstract
The magnitude of profit turnover in commercial apartments market, frequently led to the asymmetrical relationship between private sector as real estate developer and apartments owner as citizen. This condition was marked by administrative violations that are often carried out by real estate developers. Throughout 2018, the DKI Jakarta Government received various complaints related to the apartments management and operation, including conflict of interest and transparancy issues in the Apartments Owners and Residents Association (PPPSRS). Following certain agenda that had been pushed by civil society organizations since 2006, the government attempted to formulate a particular public policy to protect each party involved in the vertical housing operation. Conducted with qualitative research methods, the objective of this study is to examine the implementation of the DKI Jakarta Governor Regulation Number 132 Year 2018 concerning in the Management of Owned Apartments (Pergub 132/2018).

Keywords
real estate, conflict of interest, transparancy, vertical housing, regulation, Jakarta

Topic
Civil Engineering

Link: https://ifory.id/abstract/nB3UTaxWVAJC

Corresponding Author
Agusutrisno Agusutrisno

Institutions
Department of Electrical Engineering, Faculty of Engineering, Sultan Ageng Tirtayasa University, Jenderal Sudirman.St Km 3, Kotabumi, Purwakarta, Cilegon City, Banten 42435, Indonesia

Abstract
The limited use of navigation technology poses a risk to blind person becoming lost, while in a foreign place and causing them to rarely travel. The purpose of this study is to design guiding sticks for blind person by tracking and homing. The position of coordinates and wind direction is processed into information on sound signals and vibrations. The method used in this research is GPS bearing and inverse angle, using compass and ultrasonic sensors. Afterwards, the data output in this system is directional information in the form of sound, besides information in the form of an obstacle when in front of the sensor. The test results prove that the GPS bearing method can produce a more stable direction. However, GPS accuracy can decrease when it is blocked by trees and buildings. While the inverse angle method, GPS data is stored on the datalogger, which does not require GPS accuracy when determining direction. The angle of the direction is more accurate if the average angle when tracking is not too wide.

Keywords
Guiding Sticks, GPS, Compass and Ultrasonic

Topic
Electrical Engineering

Link: https://ifory.id/abstract/JPAbmxrf7DUQ

Corresponding Author
Yani Faozani Alli

Institutions
Research and Development Center for Oil and Gas Technology “LEMIGAS”
Jl. Ciledug Raya Kav.109, Cipulir, Kebayoran Lama, Jakarta Selatan 12230
Telephone : 62-21-7394422, Fax: 62-21-7246150

Abstract
The application of surfactant flooding to increase the oil production has been widely known as an alternate to extract the trapped oil in the mature oilfield. The surfactant-s ability for lowering the interfacial tension (IFT) of oil and water that increase the capillary number is the main mechanism in Enhanced Oil Recovery (EOR) methods to reduce the residual oil saturation. The effect of ultralow IFT of a novel natural oil-based surfactant to the residual oil saturation was investigated, whereas the effect of different flow rate during injection as one of CDC parameter was also assessed. Core flooding experiments were used as the main tools to evaluate the influence of IFT to the capillary number (Nc) that consequently affecting the residual oil saturation (Sor). The results showed that injecting ultralow IFT surfactant were able to increase oil recovery or lowering the residual oil saturation Oil saturated core was continuously injected with and without ultralow surfactant to analyze the effect of IFT to the residual oil saturation, whereas CDC profile was obtained by injecting ultralow IFT at different rate as one of the CDC parameter. The oil produce from the outlet of coreflood was collected and calculated to measure the total recovery of water or surfactant injection. CDC can then be generated by plotting the Nc with the Sor. The results showed that injecting ultralow IFT surfactant were able to increase oil recovery or lowering the residual oil saturation as much as 4%, whereas CDC-s result showed that the residual oil saturation decrease with increasing Nc, with the optimum Nc to produce oil was at the level of 10-7, rate 0.1 to 1.0 cc/min, increased 104 from Nc at waterflood stage.

Keywords
capillary number, capillary desaturation curve, CDC, natural oil-based surfactant, residual oil saturation

Topic
Chemical Engineering

Link: https://ifory.id/abstract/EBvGhP2FxceD

Corresponding Author
Phatraporn Chain

Institutions
a,b) Supply Chain and Logistics System Research Unit, Department of Industrial Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand

Abstract
Nowadays, the number of cattle farms have been increasing and spreading over the production regions. The aim of this paper is to find the appropriate locations of regional food distribution center in the northeastern of Thailand for distributing food to cattle farms. The case study was based on data from 421 standard cattle farms from all over northeastern of Thailand. Hierarchical agglomerative clustering which is a statistical technique for sorting dataset into homogeneous groups was applied to compute a range of possible clusters. After that, centroid method was used to find the location of food distribution center. The result showed that two food distribution centers are suitable for distribution of food to the cattle farms.

Keywords
Hierarchical agglomerative cluster analysis, cattle farm, distribution center, Location Decision Problem

Topic
Industrial Engineering

Link: https://ifory.id/abstract/M6X2mDxKQdgT

Corresponding Author
Ghozi Nashiruddin

Institutions
(a) Lecturer of Material Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60117, Indonesia
(b) Graduate of Material Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60117, Indonesia
(c) Student of Material Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60117, Indonesia

Abstract
CUI is a form of corrosion caused by the presence of water vapor in pipeline insulation materials. Corrosion under insulation (CUI) is difficult to observe, since the corrosion occurs between the surface of the pipe and the insulating material placed on the outer surface of the pipe. This research has purpose to know the influence of variation of fluid temperature in and variation of coating type to corrosion characteristics of outer part of steel pipe ASTM A53 Grade B with insulation material of silica aerogel and alumunium foil. Pipes to be tested at internal fluid temperature of 50oC, 60oC and 70oC with variations of epoxy, alkyd, PTFE and polyurethane coatings. With outside environmental conditions using 150ppm NaCl content. The circuit will be tested for 14 days with the immerse method. To analyze the corrosion characteristics that occur are used OM, SEM, XRD, and Weight Loss test. OM test results show that as the coating temperature rise will be damaged. While the SEM results showed that the type of corrosion that arises is uniform corrosion. For weight loss test showed that with increasing temperature the corrosion rate is increasing with coating efficiency of highest to low coating is epoxy, PTFE, PU and alkyd.. While XRD test results show that corrosion product is FeS , FeCl2 dan Fe2O3.

Keywords
CUI; Silica Aerogel; Coating; Temperature

Topic
Metallurgy Engineering

Link: https://ifory.id/abstract/C9nFmdquy7Tp

Corresponding Author
Muhammad Syahid

Institutions
Department of Mechanical Engineering Hasanuddin University, Makassar Indonesia

Abstract
Aluminium matrix composite reinforced Carbon Nano Tubes are widely developed because it can increase mechanical strength without reducing its ductility. One of the AMC / CNT manufacturing processes is through the stir casting method. The challenge of the Al / CNT manufacturing process is the occurrence of agglomeration and CNT not homogeneous so that the right casting parameters are needed to obtain optimal results. The purpose of this study was to analyze the effect of pouring temperature on the mechanical strength and microstructure of aluminium 6061 by adding Carbon Nanotube (CNT) through the stir casting method. The CNT is added by 0.1% wt and pouring temperature at 700 oC, 730 oC and 760 oC. Mechanical tests carried out were tensile test, hardness test, and impact test. The highest value of hardness and tensile strength was obtained at the pouring temperature of 700 oC are78 HV and 80.97 MPa. Lower pouring temperature causes smaller grain size so that it has higher strength. The distribution of hardness values at the top, middle and bottom of the specimen is not evenly distributed, but does not differ greatly for all pouring temperatures. The highest value of impact strength is obtained at the pouring temperature of 760 oC which is 0.128 J / mm2. Microstructure was shown the addition of CNTs caused the size of primary silicon and aluminium grains to be small which would increase the mechanical properties

Keywords
AMC, CNT, Stir Casting

Topic
Metallurgy Engineering

Link: https://ifory.id/abstract/bzhvfdGjYN8U

Corresponding Author
Prima Denny Sentia

Institutions
a) Industrial Engineering, Universitas Syiah Kuala, Jl. Tgk Abdur Rauf No.7, Banda Aceh 23111, Indonesia
b) Laboratory of Industrial Computation and Optimization, Industrial Engineering, Universitas Syiah Kuala, Jl. Tgk Abdur Rauf No.7, Banda Aceh 23111, Indonesia
*primadennysentia[at]unsyiah.ac.id

Abstract
Frozen tuna is a perishable product that sensitive to temperature changing, therefore a good cold chain system is needed. As a part of the supply chain, Cold chain system aims to maintain the temperature of the product in order to keep its quality from upstream to downstream. There are various problems encounter the cold chain process that effected to the streamline. In consequence, it is important to build a continuous improvement to reduce the risk in the cold chain. The aims of this research are to discover the risk that can be found on the cold chain process, what is the causes, and the connection between both risks and its causes. This matter to develop risk management system on frozen tuna products in Acheh. This research using House of Risk (HOS) method to capture the most critical risk and risk management system is carried out Fuzzy Inference System (FIS) by Mamdani approach. The expected result from this research is an alternative design and recommendation to solve the risk, so that strategy could be applied on the companies.

Keywords
Cold Chain, Risk Management, House of Risk (HOR), Fuzzy Logic

Topic
Industrial Engineering

Link: https://ifory.id/abstract/pX6wRNrnFqyf

Corresponding Author
Rahimul Harahap

Institutions
State University of Medan, Street Willem Iskandar Pasar V Medan 20221, North Sumatra - Indonesia, Tel: 6261-6613365

Abstract
Rahimul Harahap, Development of Thematic Teaching Materials Based on Local Culture at the Fourth Grade of Primary Schools in North Padang Lawas District. Thesis. Medan: Postgraduate Program, Universitas Negeri Medan, 2019. The purpose of this study was to develop thematic teaching materials based on local culture on theme 6 namely My Ideals of sub-themes 2, My Great Ideals. This type of research was development research (R & D). The research model used was the research design model for developing 4-D (Four D Models), consisted of four stages, namely the definition, design, develop and disseminate by Thiagarajan. The subjects of this study were the fourth grade students of SDN 103014 Batang Baruar Julu, SDN 101130 Purba Sinomba and SDN 100930 Sibatang Kayu totaling 72 students and objects of thematic research based on local culture. The instruments used were validation sheets, student responses, and learning outcomes tests. The results showed that: (1) the instructional materials developed were valid to use, (2) the instructional materials developed were considered to be effective in terms of classical student learning outcomes. It was suggested that local culture-based thematic teaching material was a tool to assist in the process of delivering learning, the existence of teachers was still very much needed as a facilitator and students remain actively involved in the learning process.

Keywords
Development of Teaching Materials;Local Culture; Learning Outcomes.

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/axKtq72wGcTX

Corresponding Author
Baehaki -

Institutions
a) Department of Civil Engineering, University of Sultan Ageng Tirtayasa, Banten, Serang, 42435, Indonesia
*andi_made[at]yahoo.com

Abstract
Ultrasonic Pulse Velocity (UPV) test includes a simple Non Destruction Test (NDT) testing method, by utilizing ultrasonic waves. In the implementation of UPV testing with direct, semi-direct, and indirect methods give a quick result of different pulse velocity, with the same quality of concrete. Therefore, this study was conducted to get the correlation and correction value of all three testing methods with PUNDIT Lab+ tool on reinforced concrete. The study used a speciment of concrete beams 15x15x60 cm3 with concrete quality K-275, K-250, K-225 each as much as 3 specimen. The average value of the measurement result with the direct UPV method is 12%, 7% and 5% less than the average value of the semi-direct method of UPV direction vertically, the semi-direct method of the UPV direction horizontally, and the indirect method UPV. Conversion of the measurement results for the direct UPV method of the semi-direct UPV vertical direction, semi-direct UPV direction horizontal and indirect UPV can use the regression equation Vd = 0.2462 Vsd-v + 3192, Vd = 0.1073 Vsd-h + 3923.8 and Vd = 0.0195 Vin + 4341.8.

Keywords
UPV Methods, NDT, PUNDIT, Quallity of Concrete

Topic
Civil Engineering

Link: https://ifory.id/abstract/XhbdENVMzw9c

Corresponding Author
syamsul Lubis

Institutions
Faculty of Sport Science, Universitas Negeri Medan

Abstract
Athletic extracurricular is a place to get athletes at the level of learning for PASI Padangsidimpuan City, the achievements achieved so far have been influenced by extracurricular activities in high school equivalent to the City of Padangsidimpuan, but in recent years there has been a decline. The purpose of this study was to determine the pattern of extracurricular training in athletics at the senior high school level in the City of Padangsidimpuan. This study is a qualitative descriptive study through observation and interviews with principals, physical education teachers and students to find out the pattern of extracurricular training in athletics at the senior high school level in the city of Padangsidimpuan consisting of 4 (four) schools namely Padangsidimpuan High School, Padangsidimpuan High School 5 , Padangsidimpuan High School 8 PRIVATE HIGH SCHOOL HOPE. The results showed that the pattern of extracurricular athletic training carried out multilateral stages consisting of observation, scouting and tiered coaching. Stages of specialization consist of sports priorities and mapping of quality standards. The top stages of achievement consist of training and competition models. Constraints on the pattern of coaching that are still in the old standard have not followed new developments, external factors have also become obstacles in the process of coaching. Based on the results of the study, it is recommended that the school that conducts extracurricular coaching follow developments regarding the latest coaching patterns to achieve peak performance.

Keywords
patterns of coaching, extracurricular achievements in school athletics

Topic
Educational Policy and Administration Education

Link: https://ifory.id/abstract/mB7zqcwgpCDT

Corresponding Author
Retno Sulistyo Dhamar Lestari

Institutions
Universitas Sultan Ageng Tirtayasa

Abstract
Papaya leaves contain chemical compounds that can be used as biopesticides. Alkaloids are compounds in papaya leaves that have biological activities and function as protectors of plants from pests and the environment. So it is necessary to do research on the content of alkaloids to be used as material for further studies in the utilization of chemical compounds in papaya leaves. Besides alkaloids, papaya leaves also contain flavonoids and tannins. This study aims to determine the levels of alkaloids, flavonoids and tannins from papaya leaf extract qualitatively and quantitatively. Extraction of papaya leaves was carried out with the aid of ultrasonic waves using 96% ethanol and water solvents for 5,10,15,20 and 25 minutes, then dried using an oven to obtain powder extract. The extract obtained was tested qualitatively using reagents that were in accordance with the test parameters and functional group analysis using the infrared spectrum. Whereas for the quantitative test on alkaloid compounds using the gravimetric method, tannin compounds and flavonoids using the UV-visible spectrophotometric method. Infrared spectrum analysis showed that papaya leaves contained alkaloids, flavonoids and tannins. Qualitative test results showed positive papaya leaves containing alkaloid compounds characterized by the presence of brick red deposits, flavonoids characterized by the formation of red color, tannins are characterized by blackish green. Qualitative test results showed that the highest alkaloid content in this study was produced at 25 minutes extraction time with 96% ethanol, which was 5.75% in 1.5 grams of extract, the largest flavanoid content was produced at water solvent extraction at 10 minutes, 2, 4088%, the highest tannin content was produced by extracting with ethanol solvent at 20 minutes, which is 0.5341%

Keywords
papaya leaves, alkaloids, extraction, ultrasonic

Topic
Chemical Engineering

Link: https://ifory.id/abstract/GAfkBUjd2Pzq

Corresponding Author
WICAKSONO SONO

Institutions
Universitas Negeri Medan

Abstract
This study aims to determine and describe the Comparison of the Effects of Scientific and Conventional Learning on the Creativity and Learning Outcomes of Physical Education Students in Senior High School Classes. This research is an experiment through a test instrument technique for learning outcomes and a questionnaire for creativity, with anava 2 x 2 research design. The number of samples was 71 people for scientific learning groups and 57 people for conventional learning groups and sampling techniques using cluster random sampling. Before conducting the analysis of variance (anava), first conduct the analysis requirements, namely the normality test and homogeneity test. Furthermore, the two-way anava test was used at the experiment; significance level of 0.05 and continued with the Scheffe test at the significance level alfa = 0.05. The results showed that there was an interaction between the influence of conventional learning and scientific learning on creativity and physical education learning outcomes. Keywords: Conventional Learning, Scientific Learning, Creativity, and Learning outcomes

Keywords
Conventional Learning, Scientific Learning, Creativity, and Results Learn

Topic
Teachers Education Model in Future

Link: https://ifory.id/abstract/z27ywHhWvaA3

Corresponding Author
Baehaki -

Institutions
a) Department of Civil Engineering, University of Sultan Ageng Tirtayasa, Banten, Serang, 42435, Indonesia
*baehaki[at]untirta.ac.id

Abstract
The crack depth measurement of concrete can be conducted by the Ultrasonic Pulse Velocity (UPV) method, but of some measuring results it provides different crack depth results in reinforced concrete testing with the same concrete quality. This raises doubts about the measurement results with UPV. This research was conducted to know the effect of reinforcement and distance tranducer effective in detecting the depth of concrete cracks. The test specimen used is a 15x15x60 cm3 concrete beam with a concrete quality of 19 MPa. The test material is made of artificial cracks as deep as ± 2 cm, ± 4 cm, ± 6 cm, and any fractured variation made 3 pieces of speciment, in addition to the test object was given a reinforcement of Ø8 mm which is placed horizontally in the center of the beam at a depth of 4 cm from the concrete surface. This testing using indirect method with variations of tranducer distance of 3 cm, 6 cm, 9 cm, and 12 cm. The study concluded that the accuracy of UPV testing results was influenced by reinforcement and distance tranducer. Test speciment with an artificial crack depth of ± 2 cm and ± 4 cm have a greater reading result with a relative error of 36.8% and 15.77%, while the test object with an artificial crack depth of ± 6 cm has a smaller reading result with a relative error ± 4.954%. In addition, it obtained an effective tranducer distance of 120 mm with an accuracy of 85.36%.

Keywords
UPV; PUNDIT; NDT; Crack Depth

Topic
Civil Engineering

Link: https://ifory.id/abstract/Ew4KaeAQnyGT

Corresponding Author
Silvia Sabatini

Institutions
a) Biology Department
Postgraduate Program of Universitas Negeri Medan
Medan, Indonesia
zinniaelegans.silvia[at]gmail.com

b) Biology Department
Postgraduate Program of Universitas Negeri Medan
Medan, Indonesia
binarimanurung[at]unimed.ac.id

c) Biology Department
Postgraduate Program of Universitas Negeri Medan
Medan, Indonesia
muftisudibyo[at]unimed.ac.id

Abstract
The impact of globalization is multidimensional; the impact is also felt in the field of education, especially higher education that directly interacts with the international community. Specifically, globalization is driving the changing role of higher education institutions. Higher education institutions are challenged to change the curriculum in total. The integration curriculum is a blend of the current national curriculum in Indonesia (Kurikulum 2013) and foreign curriculum (some schools usually use CIE as awarding bodies from England). So far, the implementation of integration curriculum in national plus schools has been going well and has a positive impact for all parties, but it also has many shortcomings. The main problem is the unavailability of appropriate learning material for both of the curriculums. The research has the aim to investigate the learning needs of teachers and students by needs assessment. The research aspects were investigated and evaluated through a needs analysis conducted by doing interview, administering questionnaire and analyzing documents.

Keywords
integration curriculum, learning materials, biology, needs assessment

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/xaTU2JvbnFDw

Corresponding Author
Dhimas Satria

Institutions
a) Mechanical Engineering Department, Universitas Sultan Ageng Tirtayasa, Indonesia
*dhimas[at]untirta.ac.id
b) Industrial Engineering Department, Universitas Sultan Ageng Tirtayasa, Indonesia

Abstract
External combustion engine, one of those is striling machine has advantage which can utilize all type of fuel, so that it is suitable for biomass utilization application. In this study an analysis of best design selection on striling machine was conducted, different from previous study, which is innovation of design on striling machine of alpha type by making corner phase to 180o, with the purpose to reduce gravitational force when the cylinder is compressed, because the corner phase currently used is (90o) has weakness which is the cylinder wall is perpendicular, so that the compressing process is against gravitational force. The design selection method is conducted by using Quality Function Deployment (QFD) method and Pahl and Beitz method, which is started by collecting the design requirement and objective (DRO), formulating House of Quality, analysis and implementation, specification determination, level function determination, function morphology determination, and best variant determination.

Keywords
Design selection; Stirling machine; Design innovation; Biomass

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/7zWeBH2C9UxF

Corresponding Author
Nazaruddin Sinaga

Institutions
a) Mechanical Engineering Department, Diponegoro University, Jalan Prof. Soedharto, SH, Tembalang, Semarang 50275, Indonesia
*) nsinaga.ccfed[at]yahoo.com
b) Mechanical Engineering Department, Gorontalo University, Jalan Abd. Wahab 247,Gorontalo 96211, Indonesia
c) Mechanical Engineering Department, Universitas Islam 45 Bekasi, Jalan Cut Meuthia 83, Bekasi 17113, Indonesia

Abstract
The performance of a motorcycle engine is greatly influenced by the cooling system. If the heat is released more than it should be then the efficiency will decrease. Thus, the engine block cooling system must be designed optimally. This study aimed to obtain a computation model that could be used to develop an optimum cooling system in heat transfer for a motorcycle engine. Calculations were performed numerically using a finite volume method to determine the effect of fin geometry and vehicle speed on the heat transfer rate of a motorcycle engine. The engine block was modeled as an annular fin cylinder which had a stroke volume of 150 cc, where the outer and inner diameter was 78 mm and 62 mm, respectively, while the fin thickness was 2 mm. The simulated vehicle speed was 40 to 100 km/h at 30 oC air temperature. The fin length was varied from 10 mm to 50 mm, and the fin pitch was 4 mm to 14 mm. It was found that there were an optimal length and fin pitch for each vehicle speed. At 50 km/h motorcycle speed, the optimum fin length and pitch were 30 mm and 8 mm, respectively. Therefore, it can be concluded that this numerical simulation can be used to design an optimal motorcycle engine block cooling system.

Keywords
computational method, engine cooling, fin, finite volume, heat transfer

Topic
Mechanical Engineering

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

Corresponding Author
Nurian Satya Wardana

Institutions
a) Universitas Indonesia
Kampus UI Depok, Jawa Barat, Indonesia 16424
*garniwa[at]gmail.com

Abstract
Demand for air conditioning is rising at an unprecedented level. Sudden increase in air conditioning usage has a potential of destabilizing the power grid and at extreme condition can cause power outages. Ability to control air conditioning is therefore a very significant subject for both the eletric power utility and electric power consumer. In some developed countries, this is realized by a program called demand-side management. The progress of information technology and the increasing affordability of the cost of fabricating electronic devices have given rise to new concepts in the implementation of demand-side management programs, namely the direct load control method. Direct load control is a mechanism that allows demand-side management programs to run automatically without interference from consumers. This is done by directly controlling consumer electricity equipment through the internet or other wireless communication networks. This study analyze the method to design controlling device for use in direct load control implementation. Load demand of the system is compared between before and after the installation of direct load control devices. Significant load reduction is noticed after the installation of direct load control devices.

Keywords
direct load control, load reduction, load control

Topic
Electrical Engineering

Link: https://ifory.id/abstract/WZd8yweGj4Kv

Corresponding Author
Naya Prakasita Putri

Institutions
(a) Biorefinery Lab, Bioprocess Engineering Program, Chemical Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia
*mgozan[at]che.ui.ac.id

Abstract
Biosurfactant is produced by a certain microorganism to reduce surface tension. Microbial enhanced oil recovery (MEOR) is one of the many applications of biosurfactant. However, the biosurfactant for MEOR needs to be able to withstand the extreme environment of oil reservoirs with high temperature and high salinity. Halomonas meridiana BK-AB4 is a halophilic bacteria obtained from the Bledug Kuwu crater in Central Java, Indonesia. The similarity of both environment condition indicates the potential to produce suitable biosurfactant. This study evaluates the potential of Halomonas meridiana BK-AB4 in producing biosurfactant compared to several bacteria isolated from the crater. The blood agar test of Halomonas meridiana BK-AB4 exhibited greenish discoloration around the colony, indicating the ability of type α-hemolysis. The interfacial tension was measured using the Du Nouy ring method to represent the biosurfactant activity, with the results of 0.014 dyne/cm. The optimum time of the culture starter for production is 6 hours, as determined from the bacterial growth curve.

Keywords
Biosurfactant; Blood agar test; Halomonas meridiana BK-AB4; Interfacial tension

Topic
Chemical Engineering

Link: https://ifory.id/abstract/A89tr3pYxKDg

Corresponding Author
Masjudin Masjudin

Institutions
Department of Electrical Engineering, Sultan Ageng Tirtayasa University

Abstract
Final project is a prerequisite that must be taken by students to get a Bachelor or Master degree. Final project contains the results of research made in a specific format as reporting the research process to the institution. Each institution has a standard format for the final project or thesis writing rules which are usually written in the instructions for writing a thesis. Institutions usually provide writing templates to follow, but because the templates only make a number of important parts and are still manual, the format of student skiry writing often changes and is not uniform with other students or some are deviant and not in accordance with the standard written format. This study designed a text editor application to help students or researchers so that it was not too problematic in the writing format. This application is based on a graphical user interface, making it easier to operate. the rules in the program are made to automate the writing entered to produce written output in accordance with the format specified by the institution. With this system, student or researcher will be easier in writing the script according to the standard of writing and get a final project or thesis report in a uniform format.

Keywords
Aplication, text editor, standard format, java programs

Topic
Computer Engineering

Link: https://ifory.id/abstract/N9PEkcFhKWrb

Corresponding Author
Anisa Maulida

Institutions
University of Indonesia

Abstract
Mesophase pitch, which can be produced from vacuum residue (VR), may be used as precursor in activated carbon (AC) production process. VR still lacks of utilization and ends up as waste. VR has the potential to be used as a feedstock because of its low cost and contains aromatics and aliphatic subtituents. Gum rosin may be added in the production of mesophase pitch because of its conjugated double bond carbon content. In the present study, co-pyrolysis occurs in a stirred tank reactor at temperature about 450℃ with heating rate of 5oC/minute and hold for 120 minutes. The amount of gum rosin mixed with VR was varied 0, 5, 10 and 15% wt of VR. The precursor products had C/H mole ratio of about 2.43, 2.37, 2.28, and 2.01. This precursor underwent carbonization at at 700℃ with heating rate 5oC/minute and holding time for 120 minutes at 700oC under N2 flow. KOH was used as activating agent to precursor of activated carbon. Activated carbon gave surface area that increase as addition of gum rosin and rasio C/H deacreasing. Activated carbon AC0, AC5, AC10, dan AC15 have surface areas of 120.81, 194.56, 312.36, dan 462.19 m2/g and high crystalline structure.

Keywords
activated carbon, gum rosin, carbonization, activation, vacuum residue.

Topic
Chemical Engineering

Link: https://ifory.id/abstract/xywtp37zDhX4