bluuebunny/crossref_metadata_2025 huggingface dataset:
Benthos population in seagrass ecosystem at Bira Island Kepulauan Seribu, Jakarta Indonesia
Authors: Komala R , Miarsyah M , Wulaningsih R D
Published: December 2019

One group of organisms that can be used as bio indicators of water quality is benthos, these organisms are spread over several habitats and also in coastal areas, one of which is in the seagrass ecosystem on Bira Island, located in the Kepulauan Seribu Jakarta. The aim of this study was to determine the dynamics of benthic population as an illustration of the environmental conditions on Bira Island for 6 months of observation. The method used in this study was descriptive with survey design. Data collecting by purposive sampling with the transect method at 3 observation stations. The data were analyzed descriptively through the calculation of abundance, diversity and dominance. The results of the study identified 23 species of benthos included in the 3 phylum with the largest to lowest composition represented by molluscs, arthropods and echinoderms phylum. The benthic population fluctuates and shows a pattern of decreasing trends every month during observation. The abundance of the highest species of each phylum is represented by Turicula javana (Mollusc), Portunus sp (Arthropods) and Holothuria atra (Echinoderms). The Species Abundance based on the observation station shows that the highest abundance is at station 1, followed by station 2 and the lowest is station 3. Benthos diversity at each station is in the moderate category, and there is no species dominates.
Growth pattern and lenght-weight relationship of Rhyacichthys aspro, in The Cisadea River, West Java, Indonesia
Authors: Paujiah E , Solihin D D , Affandi R , Sa’adah S , Zulfahmi I
Published: December 2019

During development, the organisms such as fish species generally increase in size (length, weight). Length-weight relationships or condition factor in R. aspro species were analyzed separately by sex and location. This study aims to determine the growth patterns and Length-weight relationships in the R. Aspro fish species that were captured in the Cisadea River, West Java, Indonesia. This research was conducted from June 2012 to February 2013. Fish sampling from the field was carried out for six months from June to November 2012. Sampling was carried out at the station that had been determined by Purposive Sampling which could represent the upstream, middle and downstream of the river. The parameters measured consisted of growth patterns and factors conditions for fish (Length-weight relationships). The data then analyzed using the Excell 2007 computer program and uses the FAO-ICLARM Stock Assessment Tool II (FISAT II) program. The results showed that the correlation coefficient (r) R. aspro showed a value of 0.90 for male fish and 0.78 for female fish. Based on different sexes, the fish growth pattern in all gender has a positive allomatic (b> 3). Based on location, the fish growth pattern has positive and negative alomatric patterns. There are differences in conditions both based on gender and location. The length-weight relationship R. aspro is allometric with condition factor values ranging from 0.16-2.05. As conclusion, the lenght-weight relationship of R. aspro is allometric with different condition factor. the The results of this study can be used as baseline data for the management of aquatic resources in these locations or other locations.
The effect of cage density on the quality of broiler chicken meat
Authors: Mardewi N K , Rukmini N K S , Rejeki I G A D S , Astiti N M A G R
Published: December 2019

One of the maintenance management of Broilers is the regulation of cage density. In the tropics, cage density affects comfort in a cage, high temperature and humidity are the main causes of stress in chickens. Cages with in apropriate densities have a negative impact on meat production and quality performance. The study aims to identify cage density to the quality of broiler chicken meat. The study used a completely randomized design with 3 treatments, namely density 8, 10 and 12 tails per square meter, each treatment was repeated tree times. The result showed that the difference in cage density in the maintenance of broiler chicken up to the age of fine weeks did not affect meat quality. It is recomended maintenance with a density of 12 tails broiler chicken up to age of 5 weeks can be done without affecting the quality of meat.
Biostratigraphic analysis based on planktic Foraminifera from well X in North Sumatra Basin
Authors: Syavitri D , Setiawan R , Jambak M A
Published: December 2019

There have been several studies conducted in the North Sumatra Basin, but there is a scanty information related to the age of the Formations in the basin. The aim of this study is to establish the age of the Formation. A total of 128 ditch cutting samples are used for lithostratigraphy analysis, in which 33 samples were analysed further for the Foraminifera biostratigraphy study from the well X at a depth of 6090 – 9919 feet. From the result of the analysis, 38 species from 16 genera successfully identified, as well as 5 datum species, namely FO Globigerinoides sicanus, FO Orbulina suturalis, FO Globorotalia menardii, FO Globorotalia plesiotumida and FO Globorotalia tumida. From the lithology data, three (3) lithostratigraphic unit successfully identified, namely the calcareous claystone, very fine calcareous sandstone and fine calcareous sandstone unit which is estimated to be comparable to the Baong, Keutapang and Seurula Formation. From the result of the study it’s concluded that the lithostratigraphic units found in the study area have the age range of N7-N18 or the late Early Miocene to the Late Miocene.
Application of lake sludge and natural phosphate on spinach plant cultivation (Amaranthus tricolor L.)
Authors: Mahardika I B K , Arjana I G M , Nango E O
Published: December 2019

Lake sludge and natural phosphate can be applied to the cultivation of various plants, but have not been applied to spinach cultivation. The aim of the study was to determine the effect of Lake Sludge dosage and Natural Phosphate dosage on growth and yield of unripe spinach. The experimental method with factorial RCBD used in this research. The results showed that the interaction between the treatment of lake sludge doses and natural phosphate doses did not significantly influence all observed variables. The highest yield for total dry weight per plant was obtained from the treatment of 150 g/polybag lake sludge which was 8.07g, and in the treatment of 40 g/polybag of natural phosphate dose which was 7.31 g. Both of the regression analysis between the dosages of Lake Sludge and Natural Phosphate with total oven dry weight per plant there is a linear relationship.
Utilization of natural surfactants from saponin compound of coconut leaf waste (Cocos Nucifera L.) as an environmentally friendly liquids detergent
Authors: Sari K , Setiawan I K I
Published: December 2019

The purpose of this study was to find out the results of the effectiveness of detergent detergency against stains on white cloth based on organoleptic tests and to determine the results of measurement tests for pollution levels with parameters of COD (Chemical Oxygen Demand), DO (Dissolve Oxygen) and pH levels in each treatment. This research is an experimental study with a Completely Randomized Design (CRD) or Randomized Complete Block Design method, which takes 5 treatments, namely two types of control groups including negative control (K-) by adding distilled water and positive control (K +) by adding detergent contained on the market, and there are 3 treatment groups, namely P1, P2 and P3, respectively with concentrations of 2.5%, 5% and 10% respectively. The instrument used for the extraction process is the Rotary Vacuum Evaporator and the instrument used for testing pollution levels is a set of titration tools with iodometric titration methods. The results obtained showed that the second treatment (P2) was the best treatment with an average detergency power of 3.10 or with faded parameters evenly with the edges of the stain that faded and had a minimum pollution level i.e. COD value 7.9 mg / L, DO value was 9.2 mg / L and pH level of 5.02, so that it qualifies as a low-contaminant liquid detergent that does not damage the environment.
Innovative green technology for SMEs
Authors: Hamdani N A , Herlianti A O , Solihat A
Published: December 2019

The increasing human need for natural resources causes global warming. Innovative green technology is one of the eco-friendly actions that can be taken by small and medium sized enterprises (SMEs). The purpose of this study is to discover how SMEs can possibly use green technology. To this end, an explanatory survey was conducted on a sample of 286 batik business units. The results reveal that there are several innovative green technologies that can be used by SMEs. The findings of this study may imply that innovative green technologies can be used to improve SMEs environmental performance.
Identification and implementation hybrid fuzzy logic and PID controller for speed control of BLDC motor
Authors: Anshory I , Robandi I , Wirawan W , Jamaaluddin J
Published: December 2019

One of the problems in the optimization process in the Brushless Direct Current (BLDC) speed control system is to obtain a mathematical model in the form of a transfer function. The purpose of this study to mathematically model BLDC motors in transfer functions, and optimization using Proportional, Integral and Derivative (PID) controllers, and fuzzy logic to tune PID controller parameters. The first method used is the process of identifying input and output data from the BLDC motor physical system. The input and output data of the test results simulated to form a mathematical model. The mathematical model of BLDC motor used as the basis for carrying out the optimization process with open loop systems, PID controllers, and fuzzy logic. The results of the research on the optimization process of the BLDC motor speed control system with the fuzzy logic methods obtained the best value for rise time value of 1.25 seconds, settling time value of 382.10 seconds, and peak time is 382.2 seconds. With these results, it shows that the fuzzy logic has given a better transient response than the PID controller in increasing optimal stability.
Forecasting of wind speed using Exponential Smoothing and Artificial Neural Networks (ANN)
Authors: Affan M F , Abdullah A G , Surya W
Published: December 2019

Wind energy is an environmentally and efficient energy source that is popular. Wind energy can be converted into electrical energy to meet the electricity needs of the community. This research presents results of Bandung’s wind speed forecasting for the next 5 years which aims to determine the wind speed potential in Bandung and plan for the application of a power plant to meet the electricity needs of community, using Exponential Smoothing and Artificial Neural Network (ANN) methods), simulation process of the calculation use Zaitun time-series software. Based on simulation results forecasting value with the least error value is obtained using the Artificial Neural Network (ANN) method. The results of the study determined that the city of Bandung was not suitable for the establishment of a wind power because it did not meet minimum wind speed limit suitable for a wind power.
Railway level crossing warning design in rural area using ultrasonic sensor and wireless communication
Authors: Rukmana A , Ikhsan A F , Etnisa M M , Sulisawati H , Nurichsan I
Published: December 2019

Collisions between train and roadway user in a level crossing in a rural area are the most railway accidents. A warning device for the level crossing is required to avoid the accident between roadway users and the train in the level crossing. The system shall independent from the existing railway system so that no disruption on the traffic of the train. This paper present a level crossing devices system based on ultrasonic sensors and wireless communication. Master control will display the result of detection using buzzer alarm, warning lamp, and train passage direction. Train passage warning with direction helps the roadway user to get a better awareness of incoming train and eliminate assumption of train passage direction. Especially in double track railway in a rural area, in case dual train enter the level crossing from left and right direction, the roadway users sometimes only aware on the first train passage and ignoring the second train and lead to the accident.
Analysis of the impact of distributed generation injection to stability of 20 kV distribution network system
Authors: Sucita T , Mulyadi Y
Published: December 2019

This study took a case study at PT. PLN (Persero) APJ Area Bandung with the subject raised is the installation of Distribution Generators on the distribution line of 20 kV. The purpose of this study was to determine the effect of generator installation Distribution of stability on a system of 20 kV distribution with load conditions is considered balanced. The reason for conducting this research is to find out how far DG can maintain stability on each bus. The method used in this study is to compare the results of the simulation of power flow and short circuit interference using ETAP Power System software. The results obtained from the power flow simulation before installation DG voltage drop at the end of the line. While the three phase short circuit fault current before the DG installation at the beginning of the line is x. After installation of DG with an injection of 50% power DG obtained a voltage drop at the end of the line of y and a fault current at the beginning of the line of z. While the injection of 90% of the power obtained by the voltage drop at the end of the line is v and the fault current at the beginning of the line is w. The results of the study show that with the injection of DG can increase the voltage profile on the line. Likewise, the interference current has increased, but it can be overcome by placing the location of the DG from the fault site.
Engineering design development of 52,5 KiloWatt peak solar photovoltaic system for industrial Rooftop building
Authors: Damiri D J , Legino S , Amboro S
Published: December 2019

The purpose of this research is to develop on-grid engineering design of 52,5 KW photovoltaic system on Industrial Rooftop Building. The development of solar photovoltaic system is to satisfy high demand of electrical energy for industry, offices, and public with minimum cost. Taking consideration of green energy, solar energy might be chosen as an alternative to generate electric power by utilization of Rooftop on industrial building. This research was conducted using broad database of meteorological data i.e. global daily horizontal solar irradiance. Additionally, Rooftop photovoltaic development, layout plan, photovoltaic array connection, Single Line Diagram and structure support photovoltaic module were developed using Helioscope and PV Syst software. Based on 6 months’ period simulation, annual energy produced on Rooftop is 1043.88 kWh/kWp, Global Horizontal Irradiance (GHI) 1301.96 kWh/m2, actual Global Horizontal Irradiance 5.6%, and performance ratio (PR) 80.30 % and capital Rooftop photovoltaic project forecast. This results can be used for industrial and big office in west Indonesian recommendation to develop solar energy system on Rooftop building
Designing web-based and android application to monitoring and estimating price of the use of water discharge
Authors: Susilawati H , Hidayat T M , Maulana I , Rahayu S , Nurichsan I
Published: December 2019

Water discharge is a measure of the amount of water volume that can flow or be disposed in a place in one unit of time. The research goal is to calculate the amount of water discharge and the bill for every use of water that has been used by the customer. Monitoring the use of water discharge will use the IoT (Internet of Things), with a microcontroller as a processor or input and output processing of the sensor used. The sensor used in this plan is the water flow sensor using ESP8266 module through the Internet as a data communication between tool and software. The data transmitted is water discharge in each use of 10 litters. This research will use prototyping method to know about the use of water and the price that must be paid each month from customer’s phone. The form of application is web that is created for the admin (Server) and Android application for the customer. On the next process, this design can be directly applied for the use of calculation of discharge and the bill for local government.
Spatial neural network for forecasting energy consumption of Palembang area
Authors: Rif’an M , Daryanto D , Agung A
Published: December 2019

Spatial Neural Network proposed as a new approach to determine the level of energy consumption in the future in the Palembang region, South Sumatra. Back-propagation is used to train Artificial Neural Networks. Population size, Gross Regional Domestic Product (GRDP), economic growth, Household Energy Consumption spatially per sub-district is used for this estimate. Data for 2008-2012 is used to train Spatial Neural Networks (ANN) and Data for 2013-2017 is used to validate this new approach to electricity demand prediction. The proposed Spatial ANN approach provides relatively good predictions about energy demand in acceptable errors and high accuracy for electricity demand predictions.
Information of parking place availability through the use of proximity inductive sensor based on IoT
Authors: Susilawati H , Wiharso T A , Hidayat T M , Ikhsan A F , Rukmana A
Published: December 2019

An availability of a parking place in the shopping centre remains becoming a problem since the vehicles often enter the parking area without being sure about the available parking space left in the parking lot. This research was intended to design information system regarding the availability of parking place for the vehicles when entrancing the shopping centre. Through this information system, the entering vehicles will just need to go to the available parking place. This research employed prototyping method by using microcontroller as input data processor, Inductive Proximity sensor, Wi-Fi module, and Web application. When vehicles come into the parking lot A, the sensor will provide the data on the Arduino about the available parking place in the parking area A, and then the data will be sent to the Web application by using Module Wi-Fi so that the web for the parking place A will get information about the availability and the unavailability of the parking place in that parking area. There will be also a description about the available parking place on the other parking places such as in the parking lots B and C. Through this research, the parking place for the vehicles will be more well-organized and the vehicles will be eased to look for an available parking space when they go into the shopping centre.
Narrow Band Power Line Communication (NB-PLC) frequency band review under residential load noise
Authors: Mangunkusumo K G H , Priambodo N W , Tofani K M , Supriyadi G
Published: December 2019

Advanced Metering Infrastructure (AMI) is the foundation of the Smart Grid system. One of the most important parts of AMI is smart meter communication. Power Line Communication (PLC) technology utilizes the existing power line network for communication media between smart meters and Data Collector Units (DCU). One of the biggest challenges of communication using PLC is the noise level due to residential loads. In this study, laboratory test set up to measure noise caused by PV rooftop and residential loads are observed. Each PLC frequency band was measured and observed to determine the suitable frequency for PLC communication which was the low noise level. Some experiments in the field were conducted to determine the performance of the PLC. Laboratory test measurement result shows the FCC band (150-490 kHz) was outside the range of PV rooftop and residential load noise. On the other hand, the Cenelec A (35-90 kHz) frequency range was in the range of noise signal. Therefore, NB-PLC G3 using FCC frequency band was proposed to achieve robust data communication and lower noise level. G3 PLC FCC band was tested in the real field residential area, the experimental results showed 97.62% successful rate within one-week data collection.
Investigation of high voltage ACSR transmission line dead end connector fault
Authors: Simaremare A A , Priambodo N W , Pramana P A A , Munir B S
Published: December 2019

Transmission line plays important roles in delivering electric energy from generation site closer to the customer. Failure of a transmission line can cause significant economic loss due to undelivered energy and may lead to catastrophic system black out. One critical part of transmission line is dead end connector, thus ensuring good condition of transmission line dead end connector is critical to avoid extensive losses. This paper investigates the cause of failure of dead end connectors that were installed in 150 kV ACSR lines. The failed connectors were examined and tested to find out the cause of the breakdown. Several samples of suspected bad connectors are also tested for comparison. Simulations using finite element software were conducted to provide broader insight on failure propagation. The investigation found that the dead end connectors were failed due to high current flowing through the steel part of the conductor which is caused by high contact resistance between the aluminium part of the conductor and the connector. Further study is needed to mitigate similar condition to occur in the dead end connector installation.
Measurement device for detecting oxygen saturation in blood, heart rate, and temperature of human body
Authors: Suprayitno E A , Marlianto M R , Mauliana M I
Published: December 2019

The progress of science and technology must be able to help resolve human medical problems for human survival. In this study, integrated measurement of oxygen saturation in the blood, heart rate and temperature of the human body have been made into one tool whose measurement results are displayed directly on the LCD display on a measuring instrument and an Android Smartphone. This tool uses Arduino Nano as its Microcontroller, Bluetooth as wireless serial communication with Android smartphone, Android Application Made with MIT App Inventor, MAX30100 sensor is used to measure blood oxygen saturation and heart rate, and MLX90614 sensor to measure body temperature. Testing Measurements that have been made are calibrated with Industrial standard measuring instruments (Oximeters) and digital thermometers. The result is that the accuracy of the tool reaches 99.62% for blood oxygen saturation measurements, 97.55% for heart rate, and 99.62% for body temperature when compared with industry standard devices. Android applications have been successfully installed on 5 types of smartphones with different brands and specifications. The Bluetooth range of a measuring device for a smartphone in maximum data transfer is 29 meters without a hitch and a maximum of 21.5 meters with obstacles.
Cigarette detection system in closed rooms based on Internet of Thing (IoT)
Authors: Sulistiyowati I , Findawati Y , Ayubi S K A , Jamaaluddin J , Sulistyanto M P T
Published: December 2019

Detection of cigarette smoke is very necessary to increase the level of comfort in a closed room. By implementing an Internet of Thing system in detecting cigarette smoke in the room, making it easier to monitor and control it via a smartphone. In this system, the MQ-2 sensor is used to detect cigarette smoke in the room, the NodemCu microcontroller as a data processor received from the sensor, the buzzer as an indicator sound and the blynk application to display notifications if the room is detected by cigarette smoke. The sensitivity level of the MQ-2 sensor is strongly influenced by the distance of the source of cigarette smoke with the sensor. The use of the internet of thing system affects the signal strength and network on the user’s smartphone which results in a delay when sending notifications. Therefore, a good internet network is needed. The use of IoT technology in detecting cigarette smoke in a room will be an alternative solution to increase the level of security and comfort in a closed room.
Sound indicators as safety of motorcycle
Authors: Ahfas A , Hadidjaja D , Syahrorini S , Wicaksono A
Published: December 2019

Motorbikes are popular of transportation with high usage rates. Safeguarding motorbikes are a necessity for users to provide security. Researchers offer motorcycle safety using sound indicators. The working principle of motorcycle safety offered, is after the main key, or contact is in position and the Mic sound indicator is blown, amplifier circuit works to drive the relay driver that connects the CDI unit. The motorcycle safety circuit system will live and if there is no blow, the motorcycle safety circuit will not function. Research on the motorcycle safety circuit can be used to input indicator sound. Components needed include Mic condenser, driver relay circuit, power supply. Measurement of the relay driver circuit and condenser mic aims to find out which circuit can work as planned. The measurement results obtained testing the motorcycle safety circuit with the following explanation: When the sound indicator and driver get a touch simultaneously, which gives a signal that the signal from the sound indicator is connected to the amplifier driver, so that the signal is detected, will provide input to the relay (on) and CDI unit when the motorcycle will work. With an indication the LED will turn on.
Design and development equipment to measure the motion quantities of an object that moving in air or in fluid
Authors: Marpaung M A , Handoko E , Delina M
Published: December 2019

We have developed an equipment for time interval measurement of an object that move free fall in air or in water by using microprocessor Arduino as a clock timer and is controlled by pair of laser diode and photo diode. By this technique, the main problem how to find the equation of motion can be obtained. The results show that the equipment work well. The equipment is able to measure time interval of an object that move free fall in air or in water which position change up to 10 cm. By positioning the pair of laser diode and photo diode in six different heights we can plot the position as a function of time. By the aid of a personal computer software it is easily to obtain the equation of motion of the object move both in air or in water. This equipment is useful for high school and under graduate university student to measure the gravity intensity and to study the drag force in fluid.
Optimization design of CAI for computer programming language to improve student’s competence
Authors: Sukardjo M , Sugiyanta L , Supriyanto Y
Published: December 2019

Computer Assisted Instruction (CAI) for computer programming was rare in order to improve student’s competence, the general design of CAI should be optimized. Optimized design produced proper CAI learning media targeted for vocational high school (SMK). The product implemented In certain SMK to verify the effectiveness and efficiency of learning media in the field. The research used R and D method. The study population was all students of Vocational High School class IX. The results of this study are that the use of CAI can improve student learning outcomes for mass production planning material using the VB.net programming language.
Steering control design and simulation of hybrid underwater glider
Authors: Latifah A , Fatimah D D S , Hakim B L , Mauluddin Y
Published: December 2019

A new class of autonomous underwater vehicle (AUV) is a hybrid underwater glider (HUG) that integrates buoyancy engine and propeller as the main actuator. This kind of vehicle has multi-mode to act that is glider and AUV mode that derive to the mathematical model for the longitudinal and lateral plane. To design steer control of HUG, the mathematical model derives to a linear equation, and the variable controller is rudder for yaw control and main thruster for speed control of HUG. The method of control design is Proportional, Integral and Derivative (PID), there is PD for yaw controller and P for speed controller that are simulated using MATLAB/Simulink to get a response so that we can verify the dynamic model for steering control using waypoint desire. The results demonstrate dynamic response for the lateral plane over waypoint on the surfaces of water.
Glidding system for a fixed wing aircraft using PID control algorithm
Authors: Setiawan B , Widiatmoko D , Siradjuddin I , Adhisuwignjo S , Ronilaya F , Syafaat M
Published: December 2019

In every Unmanned Aerial Vehicle (UAV) task, the power supply used is limited. UAVs are often forced to land when the battery runs out before the mission is completed. The gliding controller is proposed in this paper so that Fixed Wing Aircraft (FWA) can fly with minimal power and can adjust direction, altitude, zero pitch and zero roll stability. The FWA uses a Barometric Pressure Measure (BMP) 180 sensor at the tip of the wing to detect the difference in pressure experienced by both wings, therefore, the direction of the wind can be determined. The information of the wind direction was then used to maintain the desired altitude of the FWA. The Proportional Integral Derivative (PID) control algorithm was implemented to stabilize the FWA altitude to keep cruising or flying in a flat position. Real-time experiments using FWA have been conducted. It can be observed that the FWA was able to air with automatic glider mode for almost 2 minutes. Tests carried out include altitude data, roll and pitch movement from BMP180 sensor readings, the glidding performance has been observed with respect to the altitude, roll and pitch errors. It was measured that the altitude, the roll and the pitch errors were 1.74%, 0.23% and 0.34%, respectively.
PID controller for a differential drive robot balancing system
Authors: Siradjuddin I , Syafaat M , Patma T S , Adhisuwignjo S , Winarno T , Komarudin A , Widiatmoko D
Published: December 2019

Controlling a differential drive robot balancing system is a challenging task since it is highly unstable, non-linear and under-actuated system. This paper proposes a PID controller algorithm to balance a differential drive robot at upright position. The system model derived using Lagrangian method is discussed. The resulting mathematical model of the proposed closed-loop system was simulated. To verify the system performances, the real time experiments have been conducted. An Arduino Uno and an MPU6050 were used as the main controller and the main sensor, respectively. The PID parameters were manually tuned until the desired performance was achieved. From the simulation and the real time experiment results, the proposed method has demonstrated its capability to stabilize robot at upright position.
Designing, implementing and analysing optimal controllers on a non-linear reaction wheel pendulum
Authors: Siradjuddin I , Pradani E R K , Rohadi E , Adhisuwignjo S , Kusumawardani M , Fitriani I M
Published: December 2019

This paper discusses a reaction wheel control system. A reaction wheel pendulum is good example of a non-linear and underactuated system, which attracts control system researchers to develop many control algorithms. The reaction wheel plant is usually used for studying advanced control system courses. In this paper, a mathematical model of the state space is discussing. A proposed LQR control algorithm is explained. Simulation and real time experiments have seen carried out to verify the performance of the proposed closed loop system. The LQR optimisation algorithm was able to find the optimum feedback gains. The simulation and real time experiments show that the reaction wheel pendulum could stabilize the pendulum at upright position.
Android-based Indonesian sign language model using robot hand
Authors: Taryudi T , Yuliatmojo P , Paripurna M A
Published: December 2019

Sign language is one of the most effective ways to communicate with deaf people. However, not everyone is able to use sign language. Therefore, in this study, a sign language display system was created using a hand robot that was moved through an Android-based application on a smartphone to overcome this problem. The design and development of the system begin from the manufacture of hardware consisting of one hand robot with 11 servo motors as the actuators, the Arduino Mega 2560 microcontroller as the main controller and a Bluetooth module for wireless communication between hand robot and smartphone. Then software development is carried out on the hand robot controller and android based application on a smartphone. Furthermore, system testing is carried out by validating the results of the letters and numbers shown by hand robot with gestures in the Indonesian Language Signalling System Dictionary (SIBI). The results show that the hand robot has been able to display letters and numbers according to the instructions given by an Android-based application on a smartphone with an 80% accuracy rate.
Modified cooperative learning methods in teaching computer programming laboratory course for electronics engineering students
Authors: Parastiwi A , Ekojono E , Rahmanto A N
Published: December 2019

Modified cooperative learning is a class-based active learning strategy, where students work on problems posed by lecturers, first individually, then in small groups, and finally as class discussions. This method allows students to express their reasoning, reflect on their thoughts, and get immediate feedback about their understanding. In this study, an investigation of the quantity and quality of student involvement was conducted in the Computer Programming Laboratory course in the electronics engineering department. Lecture material is prepared to support cooperative learning as well as class observations of students conducted by cooperative learning in the course. The pattern of student involvement was observed using the student behaviour observation form that was developed and validated. Data triangulation was done with student perception survey data. The results showed that matching timing varied depending on the topic with an average of 20 minutes for the concept presentation by the lecturer. Student involvement is very high in the form of writing and discussing groups and classes. Triangulation of student perceptions states that students feel actively involved fully in the learning process.
Efficiency analysis of refrigerant work fluid in the Organic Rankine Cycle (ORC) as an energy generating machine electricity 1 kW scale
Authors: Abdullah M Y , Prabowo P , Sudarmanta B
Published: December 2019

At present, the depletion of fossil energy resources will have a significant impact on every aspect of life in Indonesia. One effort to overcome this problem is by conducting research to look for renewable energy sources. This study uses the Organic Rankine Cycle (ORC). The types of refrigerants used in this study are R141b, R245fa, and R123 using the Aspen plus Program Simulation. This study focuses on the working fluid R141b, R245fa, and R123 on the ORC as a 1 kW scale electric energy generator. The results obtained from the Aspen Plus Program Simulation in the ORC Cycle use working fluids R141b, R245fa, and R123 at a pressure of 3 bar to a pressure of 10 bar at a temperature of 95 ° C. The maximum efficiency produced is 8.65%, 7.79%, and 8.36%. The turbine power produced is 1005 watts, 896 watts, and 770 watts. From the simulation results used in the ORC working fluid R 141b has an Efficiency and Power value that is best used as a 1 kW electric energy generator with an efficiency value of 8.65% and 1005 Watt Power.
Comparison of predictive performance and measurement of off-grid 15 kWp solar power generation in Aceh Tamiang
Authors: Thaib R , Rizal S , Rizal T A
Published: December 2019

In 2015, the Government, through a special allocation fund, has finished constructing an off-grid 15 KWp off-grid solar power plant in Paya Tampah Village, Aceh Tamiang district. The long-term reliability of solar power plants is highly reliant on on-site measurements because of the vagueness in some of the constantly-changing variables such as irradiation, drought rate, which possibly lead to cause significant power losses and which turn out to also affect the estimated cost of PV (kWh). With the aim of upgrading capabilities in off-grid solar power plant planning especially in the province of Aceh, this paper outlining detailed comparison of the results of calculating the performance of off-grid 15 KWp off-grid solar power among system performance measurement results after 2 years of operation. Performance calculations performed with the assistant of PVsyst software. The measurement results characterize the total power generated by the off-grid solar power plant is 15 kWp and used by 38 households. The result of this investigation is expected to be used by local governments to be a benchmark on the future planned off-grid solar power plant planning.
Utilization of Beeswax/Bentonite as energy storage material on building wall composite
Authors: Thaib R , Hamdani H , Amin M
Published: December 2019

The combination of building materials and PCM is an efficient way to increase thermal energy storage capacity in building components. In this study, a study of the use of beeswax/bentonite PCM on the concrete walls of the building had been carried out. This investigation intended to ascertain the amount of concrete compressive strength if coarse aggregates were replaced in part by PCM beeswax/bentonite. The use of PCM-beeswax in the concrete has not been able to increase the strength of concrete. Even worse, their existence proof to decreased the compressive strength of PCM mixture concrete. Heat absorption test shows that PCM beeswax/bentonite is capable of decreasing the concrete temperature up to 6,67% compared to concrete without PCM. It also means that the PCM proposed in this study shows great potential for application as a phase change material in lightweight concrete.
Effect of pulley primary angle variation and roller 11 grams on 110 cc Scoopy injection engine
Authors: Widodo E , Mulyadi M , Iswanto I , Tjahjanti P H , Anggara S B M
Published: December 2019

Transmission automatic or known as (CVT) is a transmission that makes us feel comfortable because we only need to pull the gas without moving the transmission because the transmission is automatic. Automatic motors not only make driving easier but also facilitate the maintenance of the transmission. However, among racing motorbike lovers, this automatic transmission type motor is lacking in power. So, it needs to be modified to the CVT component to improve the performance of the machine. To improve this performance, we analyze pulley and standard roller manufacturers and primary pulleys with 3 kinds of pulley, namely standard angles of 14°, 13°, 12° and roller 11 gram variations to determine the comparison of Performa (horse power and torque). To find out the comparison of the test, we do the test using the Dyno test. From the test results, 13° pulley and 11 gram roller have increased significantly compared to standard 14° and 13 gram roller standard pulleys. This can be seen from the results of an increase in horse power and torque when using pulley 13° and 11 grams roller can be obtained on the highest horse power (Hp) at 3246 rpm, which is the highest 9.0 hp and torque (Nm) at the engine speed 2087 rpm which is 22.16 Nm. While the standard pulley of the factory is 14° and the standard 13 grams roller can be seen the highest horse power (Hp) at 3923 rpm round, which is 7.8 Hp and the highest Torque (Nm) at 2972 rpm engine speed which is 16.99 Nm. then from the results of this test analysis has increased horse power 1.2 hp and torque of 5.17 Nm.
Infill pattern and density effects on the tensile properties of 3D printed PLA material
Authors: Rismalia M , Hidajat S C , Permana I G R , Hadisujoto B , Muslimin M , Triawan F
Published: December 2019

Additive manufacturing such as 3D printing is considered as a highly convenient manufacturing process since it enables to create any 3D objects. It is known that different materials, printing techniques, and printing parameters are affecting the mechanical properties of the printed objects. However, studies on the mechanical properties of the 3D printed structure are still limited. In this work, investigation of the relationship between two printing parameters, i.e. infill pattern and infill density were conducted on the Polylactic Acid (PLA) material. Three infill densities, 25%, 50%, and 75%, and three infill patterns, grid, tri-hexagon, and concentric, were chosen. The tensile test, ASTM D638, was employed to obtain the material properties based on these two printing parameters. An open-source 3D printing slicer software, Cura, was used to manufacture the tensile specimens. The Young’s modulus, yield strength, and ultimate strength were recorded and examined. The results showed that the tensile properties increase as infill density increases. Of the three-printing pattern, the concentric has the highest values of tensile properties regardless of the infill densities. This finding can be used as a reference for creating a finite element model (FEM) as well as predicting the optimum tensile properties with respect to the printing parameters.
The effect of blade angle on two-stage water turbine against power and efficiency
Authors: Haryono D A , Fahruddin A , Akbar A , Mulyadi M
Published: December 2019

The Indonesian region has abundant alternative energy sources that can be used to meet electrical energy needs. One potential alternative energy source is water energy that can be converted into electrical energy with a water turbine. Water turbines are generally one stage, whereas water energy on the output side is still quite large. In this study, experiments were made using a two-stage micro water turbine model with blade angle variations on the second stage turbine. The type of turbine used in this study is a crossflow turbine with a vertical shaft. The results show that the 45˚ blade angle on the second stage turbine can increase the second stage turbine rotational speed, and also increase the power of second stage turbine. The total power of the turbine increases up to 29% compared to 15˚ blade angle. This indicates that the appropriate selection of the second stage turbine blade angle will significantly affect the total turbine power and its efficiency.
High-pressurizing green algae in third generation bioethanol production
Authors: Aditiya H B , Theofany H C , Yheni M
Published: December 2019

The effects of fossil fuel combustion are famously concerning. 70% of the global production of carbon monoxide is accounted from transportation sector; the sector in which fossil fuel is popularly being continuously used. As one alternative fuel, bioethanol is a renewable fuel which have attracted many researchers in the pursuit of lowering dependency on fossil fuel and its negative effects to the environment. In third generation bioethanol production, green algae are deemed to carry high potential as the feedstock due to its ampleness, especially in a tropical country such as Indonesia. In this study the ability to produce simple sugars of green algae was observed through high-pressurization treatment. Different treatment pressures were achieved through varying temperature set in the autoclave: 110 and 130oC. The recorded pressure was up to about 180 kPa gage, and this treatment was also compared with non-pressurizing production method. Samples were analysed for reducing sugars content through DNS method. Since simple sugars are essential in the fermentation stage, the produced sugars from green algae are the indication of potential as the feedstock in bioethanol production. The impact of this study supports the progress of fossil fuel-to-biofuel scheme in Indonesia, and the outcome from this preliminary study can be used as the reference for further studies.
Microwave irradiation pre-treatment in third generation bioethanol production from tropical green algae
Authors: Theofany H C , Yheni M , Aditiya H B , Sepwin N S
Published: December 2019

Through centuries the side effect of the massively growing of population is the energy demand and consumption. As a result of this, the world energy used from the non-renewable fossil fuel has reached 80%. To counter this, researchers have found alternatives for this fossil fuel; and bioethanol is one of the alternative and sustainable options. One source of bioethanol that is believed carrying high production potential is photosynthetic algae or green algae. In this study, Chlorophyta (Green Algae) was hydrolyzed using microwave irradiation. Operation Mode (OM) was varied to observe its effect during the hydrolysis stage. Further, hydrolysis time (t) was also selected as the variable in this study to examine the result of reducing sugar. From the result of this experiment, it is projected that the sugar produced from hydrolysis assisted by microwave irradiation would bring a high-quality bioethanol production. Also, from this study, it would exhibit the great potential of bioethanol from green algae as the fossil fuel substitute in order to create a more sustainable and environmentally friendly energy source.
Finite element analysis of Miura origami column under uniaxial compressive load
Authors: Hidajat S C , Permana I G R , Rismalia M , Herianto  , Triawan F
Published: December 2019

This paper presents the finite element analysis (FEA) of 3D printed Miura origami column under uniaxial compressive loading condition. The finite element model (FEM) was developed under elastic-perfectly plastic material model. Investigation on the yield strength and compressive modulus with two varied parameters, i.e. angle and thickness of the Miura origami column was conducted. Abaqus 6.14 software was used to conduct the simulation of compression test. The simulation result is then compared with and examined to the referred experimental data. From the simulation, it was revealed that the results from FEA of Miura-ori column with θ = 90° and t = 2 mm showed good agreement with the referred experimental data. However, FEA results mostly overestimates the mechanical properties. This discrepancy could be due to the existence of imperfections and anisotropic material of 3D printed structures.
Study on the compressive behavior of Miura origami column structure
Authors: Permana I G R , Rismalia M , Hidajat S C , Nandiyanto A B , Triawan F
Published: December 2019

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 column structure using the Miura-origami pattern is investigated. Polylactic Acid (PLA) material was used to make the specimen with various printing parameters, i.e. infill pattern and density. Moreover, six kind of origami patterns with different folding angle and wall thicknesses were tested. Finally, the elastic and plastic 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. In addition, this study is expected to give impact on developing an innovative engineering design by the use of Miura-Ori pattern, for example is on designing an energy absorption device such as prosthetic leg and automotive crash box.