bluuebunny/crossref_metadata_2025_split huggingface dataset:
Overload handling of IBT using load and capacitor shedding
Authors: Rabbani F M , Ardita I M , Aryani D R , Jufri F H , Utomo A R 
Published: December 2019

Abstract
Faulted Inter Bus Transformer (IBT) can cause power system instability. Therefore, it will be isolated to prevent the spreading of disturbance. IBT at the Ptn Substation which supplies Ptn – Grt and Dwt Subsystem is discussed in this paper. The event discussed is 2 of 3 IBTs are out of work so that only one left. So, load shedding of Dwt Subsystem is required to avoid further disturbance. However, after it is applied, the voltage at the Dwt Subsystem will increase beyond the allowed rating. Therefore, further action is required by releasing some capacitor banks of several substations that have the highest rated voltage until the voltage in all substations is within the permitted rating. Finally, The system return to stable after load shedding with total 226.45 MW and capacitor shedding with total 150 Mvar.
Influence of shading to the output power of photovoltaic in Indonesia
Authors: Ramadhan U F , Apriansyah M E , Alvianingsih G , Utomo A R 
Published: December 2019

Abstract
Indonesia, being a tropical country, has a high photovoltaic (PV) energy generation potential that can help meet demand due to the impending shortage of power supplies in the coming years. The shading effect is a negative effect that causes the Photovoltaic power output to drop from its normal state. The performance of Photovoltaic Panels (PV) is a shared module surface exposed to sunlight. Shading effects usually occur from the influence of clouds, but the influence of these clouds often causes a lack of uniform illumination of sunlight received by the photovoltaic. This is also often called Partial Shaded. Partially shaded PV systems cannot operate at maximum efficiency because of shadows cast by surrounding structures, foliage and cloud cover. This is done to see the effect of partial shading pattern effect on solar cell PV. Characteristics of I-V can be influenced by pattern shading effect. The voltage and current of PV solar cells will drop from partial shading effect experiment which consists of 20%, 40%, 60%, 80% and 100% shading area.
The usability of the educational board game for learning english
Authors: Soewardi H , Perdana M F 
Published: December 2019

Abstract
English is the most widely spoken languages in the world and used as an international communication. The importance of English proficiency is the primary reason for people to be motivated in English learning. Such learning process requires a learning facility to help achievement the learning goals. One of the English learning facilities is board game which has been developed in the previous study. However, the usability of this board game design as media in teaching-learning process remains unproven since it needs a reliable testing. This study aims to analyze the usability of educational board game design developed based on effectiveness, efficiency, and satisfaction parameter. Usability test was conducted using performance measurement method and the system of usability scale questionnaire was distributed to more than 30 respondents of elementary education level at the fourth, fifth, and sixth grade. Experimental study was done in the elementary school to collect the required data. Statistical analysis was applied to test the hypothesis. Result of this study shows that the usability of developed educational board game design is valid for the learning process of elementary school students at 5% significance level with usability level of 85% for effectiveness, 83% for efficiency, and 71% for satisfaction.
The design of cold chain risk management system of frozen tuna product in Aceh using fuzzy logic
Authors: Sastra H Y , Sentia P D , Asmadi D , Afifah M 
Published: December 2019

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 Aceh. This research using House of Risk (HOR) method to capture the most critical risk and risk management system is carried out Fuzzy Inference System (FIS) by Mamdani approach. The results of risk evaluation using HOR phase 1 show that there are 2 risks from 20 existing agents and 33 risk events that must be managed with the risk management, namely human errors and temperature during initial handling that is not according to standard.
Design analysis of raw materials inventory on TC1118 cloth products with JIT approach
Authors: Rimawan E , Mardono U , Kustiadi O , Lutfi M A , Saraswati I 
Published: December 2019

Abstract
Control of inventory of raw materials becomes an important part of the manufacturing process. By controlling good raw materials will reduce storage costs in warehouses, increase productivity and profits of the company. In this paper use quantitative methods that will result in the calculation of the most efficient order quantity to increase the productivity. Based on the just-time approach, control of raw material inventory is done by planning the purchase of raw materials by using the right delivery system so as to produce short delivery time. By ordering one day and added with proper inventory calculation will result in a reorder point in accordance with the company’s production capacity and able to reduce the storage of raw materials in the warehouse. The impact of the implementation of just in time, storage of raw materials in the warehouse becomes less and reduce inventory cost by 9.4%, so as to generate greater profit the company and can make savings of Rp7.581.515.237.
Analysis and information system designs of surveillance infection control system in the hospital
Authors: Sugarindra M , Risdiana N , Rosa E M 
Published: December 2019

Abstract
Almost of infection diseases transmitted in a hospital by medical divides. Until now there is no surveillance system that can store data about system infections in hospitals. This study aims to analyse and identify the design of information systems in hospitals. The method used is using Rapid Application Development (RAD). The results of this study consist of the duties and functions of health workers in the surveillance system as well as data that needs to be known when conducting surveillance. Conclusion in this study was identifying the duty of health workers as users and data that needs to be taken in conducting surveillance.
Comparison of PID and fuzzy logic to control the motions of robotic prosthetic limbs
Authors: Widhiada I W , Budiarsa I N , Widiyarta I M , Coglitore T 
Published: December 2019

Abstract
Prosthetic limbs are one of the tools that can be used for people with lower limb disabilities. The bionic leg is one of the breakthroughs in which its movements can be regulated by the implementation of a control system on the microcontroller. Testing is done by interfacing with Matlab / Simulink on the prototype using the PID control system and the Fuzzy Logic control system with a time of 10s at a reference angle of 90°. The PID control system design is done by auto-tuning to get the required parameters, kp, ki, and kd while the Fuzzy Logic control system by determining the input and output parameters and its rules. The PID parameters obtained were 2 KP, 18 KI, and 0.5 KD while the Fuzzy Logic is the reference signal input and voltage of the DC motor as the output. The motion data obtained from the transient response is the maximum overshoot, percentage error, and settling time from both of the control systems, as for the PID 6.90%, 3.69%, and 0.877s respectively and 3.31%, 3.46%, and 0.610s respectively for the Fuzzy Logic control system. The prototype performance with the Fuzzy Logic control system is better than using the PID control system.
Improved value of temperature different on climatic chamber climatic chamber for thermal conditions
Authors: Sukamto D , Gloriant F , Siroux M 
Published: December 2019

Abstract
Climatic chamber machine at Climatherm laboratory was used for thermal test on wall model. This climatic chamber machine allows the measurement of different environmental variables. In this research, thermal performance tests were conducted on wall model imposing boundary condition vary the cavity distance between two wall elements and then these tests were performed in steady-state conditions. Wall model prepared from aluminum composite and was maintaining controlling the air temperature difference between the two chambers 20°C and the air debit constant. In the first part of this paper, a description of the climatic chamber machine, operation ranges, and theoretical work principles of the climatic chamber are presented. Then, the second part shows the results for the thermal test on wall model. The thermal test performed with the climatic chamber machine allows simulating environmental conditions accurately during in certain distance of cavity and specific air debit. As a result, the configuration settings value at the climatic chamber machine has to correction to reach the air temperature difference as planned. The air temperature difference at the beginning of the thermal conditions on wall model is less than the planned air temperature difference. However, this correction value of temperature shows agreement result with the value 20°C in temperature different.
Development of brake lining based on mountain stone and shellfish waste
Authors: Suriadi I G A K , Atmika I K A , S Komaladewi A A I A 
Published: December 2019

Abstract
In general, brake pads made from asbestos, when used asbestos brake lining have a negative impact on health and the environment. In this research, a hybrid composite brake lining was developed with reinforcement of mountain stone powder, shellfish powder, and alumina with a certain composition. This paper describes the compression strength and water absorption ability of hybrid composite brake linings developed, as an alternative to brake pads that have good mechanical properties and are environmentally friendly. Hybrid composite brake lining material is made in seven weight fraction compositions through a sintering process. The test method is carried out by an experimental method based on ASTM E 9-89a for compression strength testing and based on ASTM D 570-98 for water absorption. The results showed that there was an influence of weight fraction on each composite variation on the compression strength of the brake lining. Reduction of percentage of mountain stone in each composition resulted in varying compression strength values, with the highest compressive strength value in specimen A of 0.1350 kN/mm2 and the lowest in specimen G of 0.0883 kN/mm2. Then the highest water absorption of the brake pad specimen made is 0.041558%, still lower than the asbestos brake lining pads.
Effect of activation time the chicken feather activated carbon on surface area of pores: Candidate for hydrogen storage application
Authors: Partuti T , Alhamidi A , Ardiansyah M Y 
Published: December 2019

Abstract
The use of renewable energy such as hydrogen gas as fuel is still very lacking due to difficulties of its storage. Hydrogen storage material is focused on developing porous material. Chicken feather is one of the organic wastes that can be used as porous activated carbon. The chicken feather activated carbon made in powder and briquette form. The activation process was carried out physically with variation in time 30, 60 and 90 minutes, temperature 500 °C and flow rate of nitrogen 0.3 l/minute. The carbon content from carbonization of chicken feathers is 62.85% using ultimate analysis. The activated carbon analysis with Brunauer-Emmett-Teller (BET) show that surface area for powder sample before activation is 0 m2/g and with activation time 30, 60 and 90 minutes is 79.28 m2/g, 128.28 m2/g and 332.49 m2/g, respectively. The surface area for briquette sample before activation is 20 m2/g and with activation time 30, 60 and 90 minutes is 741.37 m2/g, 150.55 m2/g and 162.65 m2/g, respectively. The Scanning Electron Microscope (SEM) results show that pores appear on the briquette sample are much more and more visible than the powder sample. The pore surface area of the briquette sample is inversely proportional to the increase of activation time. The longer the activation time the pore surface area of the briquette sample decreases. While for powder samples vice versa.
Effect of stored energy on corrosion fatigue properties of ultrafine grained Fe-20%Cr steel by equal channel angular pressing
Authors: Rifai M , Miyamoto H 
Published: December 2019

Abstract
Corrosion fatigue properties of ultrafine grained (UFG) Fe-20%Cr steel by equal channel angular pressing was investigated in term of grain refinement and stored energy. The corrosion fatigue life of the ECAP processed and the post-ECAP annealed sample was analysed. Under annealing temperature of 773 K, due to the recrystallization stage, there was a little difference in microstructure from the four passes ECAP. After the annealing process, the strength of the samples pressed four passes decreases, while the elongation showed more ductile. Two mechanisms for crack propagation have been well recognized for stainless steel. One is slipping step dissolution mode. In this model, the slip step formed by active dislocation at a crack tip is anodic dissolution reaction, so that crack tip advance to further distance. The other is stress adsorption mechanism. The corrosion fatigue cracks initiation and cracks propagation process of iron-chromium alloy can be characterized by corrosion pits and intergranular fracture, respectively. The corrosion fatigue behaviour of non-equilibrium and equilibrium grain boundary of iron-chromium alloy was occupied by crack initiation.
The effect of heat energy on/of iron direct reduction process
Authors: Milandia A , Juniarsih A , Muadz R , Sactianto A , Suryana  
Published: December 2019

Abstract
Direct Reduction is one of the process to converted iron ore into metallic iron. The conversion of iron oxide into metallic iron occurs through saveral stages of intermediate phase. This intermediate phase included of hematite, magnetite and wustite. Iron ore direct reduction is the process involved high temperature because temperatures will provide heat energy. Sufficient heat energy will ensure all stages of converted phase completely reacted. To analyze heat energy inside of the specimen. Ansys software was utilized to simulated iron ore direct reduction process. This simulation using agglomerate spherical and cylindrical form. Temperatures simulation take place at 973 into 1373 Kelvin for 30 and 60 minute. This simulation also simulated carbon monoxide (CO) as reduction gas at 1 atm. According to simulation spherical pellet in the diameter 3 requires higher energy to convert iron oxide into metallic iron.
Stability Improvement by Reducing Voltage Fluctuation using SVC in Penetration Wind Power System
Authors: Siswanto A , Gunadin I C , Said S M , Suyuti A 
Published: December 2019

AbstractCurrently, wind energy is a renewable energy that is growing because some of its advantages are connected to the grid system. This study is focus on presenting a probabilistic theory to design power system stability (PSS) and excitation of the FACTS system controller generator via Static Var Compensator (SVC) connected to wind turbines in Sidrap, region of South Sulawesi system. The purpose of the test system is on oscillation, profile voltage and influence stability of wind turbine penetration. An oscillating system requires system performance compensation from the side of the machine via PSS and transmission via SCV to increase the depth of the electro mechanical mode. So, the simulation results on 44 buses in the South Sulawesi system show the stability of the system and rapid voltage improvement and can reduce the oscillation that occurs. This system is tested using a time domain-based PSAT software simulation on the system.
Monthly Rainfall Prediction Using Statistical Downscaling with Combination of Grid Boxes and Adaptive Neuro Fuzzy and Inference System in Lombok
Authors: Safril A , Ulfiana A 
Published: December 2019

Abstract
Lombok is an island in Indonesia that has more people live in this area. Flood is a natural disaster that cause severe impact on society. To manage the risk of natural disaster, seasonal prediction of rainfall for early warning system are needed. However, prediction is difficult to predict due to El Niño and La Niña. Seasonal prediction of rainfall using Global Circulation Model (GCM) is useful to capture rainfall variability, but has a lack information because it has coarse of grid resolution (more than 200 kilometers). This model cannot provide in the local area so statistical downscaling model is used to get detail information. To optimize the result of prediction from global model, a method to capture the extreme condition is needed. Taking a best predictor that will be used to predict the rainfall is done to get the high performance of model used Singular Value Decomposition (SVD). ANFIS (Adaptive Neuro Fuzzy and Inference System) is a model prediction to capture the rainfall variability. Predictor is chosen based on the physical condition of atmosphere and ocean that have impact on Lombok Region. Selected area of predictor (atmospheric variable) are grid boxes in the Maritime Continent (80°E - 150°E and 12.5°N – 12.5°S) and Nusa Tenggara (105°E - 120°E, 10°S - 0). Eight variable predictors are used for prediction, they are air temperature at 2 m (T2M), geopotential height at 500 mb (Z500), zonal and meridional wind at 850 mb (U850 and V850) and at 200 mb (U200 and V200), sea level pressure (SLP), and air temperature at 850 millibar (T850). Both predictor variables (grid box combination) are used to predict for lead time one month. The result of research shows that rainfall prediction can capture the rainfall variability (correlation 0.70) with RMSE (Root Mean Square Error) is 69.
The Effect of Hanging Sheet Pile Breakwater’s Draft Relative on Wave Transmission Coefficient (Kt) in Irregular Wave
Authors: Paotonan C , Umar H , Baeda A Y , Rachman T , Hasan W 
Published: December 2019

Abstract
Breakwater is a structure that builds parallel to the coast, and located within some distance from the coastline. The breakwater that is currently and widely used is Rubble Mound Breakwater; a large dimension coastal structure with also come in high price. Due to this matter, a Hanging Sheet Pile type breakwater can be one of good solution. This research was conducted at Ocean Technology Laboratory, Faculty of Engineering, Universitas Hasanuddin, in a flume thank with 1:25 model scale, and equipped with wave generator and probes as measurement apparatus. The purpose of this study is to identify the effect of wave parameters (Hi/gT2) and structure parameters (draft relative, s/d) on fluctuated wave transmission coefficients produced. The waves are in the form of irregular waves that generated using JONSWAP spectrum. There were 5 variations in wave height (H) and wave period (T), while variations of structure in the form of draft (s) are in 3 variations. The results of this study indicate that the value of Kt will decrease when Hi/gT2 value increase; so that the greater the value of s/d, the smaller value of Kt will be.
Feasibility Study of Biogas from Banana Peel Waste and Livestock Manure Mixture as Renewable Energy Source
Authors: Rahim I R , Lando A T , Sari K , Asriyanti E , Ihsan M 
Published: December 2019

Abstract
Biogas energy can be obtained from waste of domestic, sewage, cattle, market, food industry etc. Banana peels contain chemical compounds such as cellulose, hemicellulose which contain acidic organic compounds that can be used as substrate for biogas production. Purposes of this study are to analyse the characteristics, the composition and the production cost of biogas made of mixtures of banana peel and livestock manure. The study used 6 biogas reactors where each reactor has 19 L capacity with ratio of 1:2.5 for solid and wastewater. The result shows that reactor E2, containing 7.1% of cow and chicken manure and 14.3% of banana peel, produced the highest rate of biogas (91.4%) when compared to other reactors. E4 reactor produced 209 ml of biogas as effective composition, consisting of 2.4% of cow manure, 7.15% of chicken manure, and 19.0% of banana peel. In terms of production cost, E2 reactors have the most effective composition, with the ability to produce 0,000174 m3 of methane by Rp. 5,747 per kg. Biogas made of organic material and livestock manure is relatively less expensive compared to 3 kg of LPG gas with a price of Rp. 18,000. E4 reactor biogas could produce 209 ml with a composition of 357 g of cow manure, 1,071 g of chicken manure, 2850 g of banana peel, 5.355 l of water for livestock manure and 5.355 l of water for banana peel.
Natural Frequencies of Laminated CFRP Square Plates with Slightly Different Material Properties
Authors: Narita Y , Innami N 
Published: December 2019

Abstract
The influence of using different material properties is studied on the natural frequencies of laminated composite square plates composed of recently developed carbon fiber reinforced plastic (CFRP) materials. The plate is symmetrically laminated by thin layers with each layer reinforced by parallel straight carbon fibers. Using the Ritz method in conjunction with the thin plate theory and the lamination theory, the displacements are assumed as finite polynomial functions with the boundary index to accommodate any combination of classical boundary conditions. The material properties are expressed by a set of four elastic constants, and some typical constants are referred from the recent literature. In addition to these sets of constants, a new standard set of discretized constants is proposed to consider the underlying characteristics of the existing constants. In numerical experiment, the convergence study is carried out, and the lowest five natural frequencies are presented in frequency parameters for five sets of classical boundary conditions. Next, for better insight, a new definition of frequency parameters is introduced to promote more physically meaningful comparison, and the influence of using slightly different constants in frequency calculation is clarified for the purpose of deriving approximate frequency formula.
Development of a Shrouded Wind Turbine with Various Diffuser Type Structures
Authors: Klistafani Y , Mukhsen M I 
Published: December 2019

Abstract
The Shrouded wind turbine is an innovative mean to increase power generated by wind turbine. By encompassing the rotor with a diffuser structure, it is possible to increase the wind velocity through the turbine up to 1.8 times of free stream velocity. Specifically, this study is numerical simulations that investigate the effect of wind velocity on various diffuser type structures to develop shroud wind turbine. Numerical study was conducted using Computational Fluid Dynamics (CFD) method. A reasonable agreement between the computed results, available experimental data and previous simulation is obtained. The results show that simulation results have good agreement to experimental results. However, Curved diffuser give the best increment of wind velocity (at centreline diffuser) than flat diffuser and others, which is 84.18%, with the maximum velocity was 9.21 m/s. Regarding the velocity contour results, vortex in downstream curved diffuser is bigger than others. Therefore, suction effect on curved diffuser is strongest and can generate positive impact on the wind velocity quality inside the diffuser.