bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of electric power system oscillation damping
Authors: Daryanto D , Rif’an M , Purwanto G
Published: December 2019

Operation of an electric power system through a transmission network that has limited capacity can cause system instability when the system is disturbance. This study aims to investigate the influence of dynamic loads on the electric power system oscillation damping. The interaction between the electric power system and dynamic load after and before interference is simulated through Simulink Matlab. Dynamic load models are developed from the Hill model based on load power responses due to voltage changes. While the electric power system model is based on a model developed by Demello, which is a Single Machine Infinite Bus System. Based on the two models, an overall block diagram is made that illustrates the interaction between dynamic loads and the electric power system. The results showed that there was an increase in the stability of the electric power system with dynamic load feedback and a decrease in the rotor angle and increase in voltage. So that it can be concluded that changes in dynamic load parameters affect the stability of the electric power system. This study can be used as a basis for studying the behavior of electrical power systems that experience greater disturbance with load feedback.
Performance analysis of ocean water power plant as a renewable power plant for leading regions, outermost areas, underdeveloped region
Authors: Subekti M
Published: December 2019

This research for performance analysis of ocean water power plant to get design optimization based on research scenarios. The method used is experiment, by conducting a prototype analysis of the initial calculations to be included in the modeling simulation. through research scenarios to get the most optimal prototype performance. The results showed that (1) the greater the pontoon volume used, the greater the pontoon force produced, the pontoon force was not affected by the size of the pump diameter. (2) the larger the diameter of the pump used, the greater the discharge of water produced, the water discharge is not affected by the small volume of the pontoon, (3) the magnitude of the lift system to seawater is not affected by the size of the pump diameter but the size of the pontoon volume, the greater the pontoon volume used, the greater the lift power, (4) the greater the pontoon volume used, the turbine power The result will be even greater with the diameter of the pump, the larger the diameter of the pump used, the greater the turbine power produced. From the results of the study, it can be concluded that the optimal size uses 6 pontoons and 12-inch pump diameters. The implications of this research are that in addition to increasing the value of electrification in Leading Regions, Outermost Areas, Underdeveloped Region, it can also improve the economy of the community while helping the government to succeed the National Medium Term Development Plan
An improved control method to reduce harmonic level for a single phase grid-connected flyback micro-inverter of a small scale solar PV
Authors: Ronilaya F , Djulihenanto S , Murdani A , Siradjuddin I , Rohadi E , Asmara R A , Nurhadi S
Published: December 2019

One of an attractive solution for PV ac-module is flyback-type micro inverter since it has a number of advantages include simple control, stable current injection and potentially low-priced technique. But, it has high voltage ripple in the DC-link that may cause high harmonic distortion. Hence, a smooth DC voltage is required in order to maintain the total harmonic distortion within standard level. DC link voltage can be smoothened by using capacitor. However, the size of this capacitor is large and hence affects the weight and size of the inverter package. This paper proposes a control method to reduce harmonic level for flyback-type micro-inverter. MPPT (maximum power point tracker) technique used in this study is perturb & observe because it is the simplest online MPPT method with high efficiency. Several experiments are carried out to examine the effectiveness of the proposed method. The results show that the proposed method can reduce the harmonic level significantly and can be used as an alternative solution.
Small signal stability analysis due to the development of renewable energy generators in Sulawesi electricity
Authors: Darmawan H S , Hadi S P , Sarjiya S
Published: December 2019

The problem of small signal stability is one of the main problems in the current power system because the purpose of operating the system is close to the limit. Small signal stability is important because small disturbances in the form of non-dampened electromechanical oscillations have limited the power flow limit in a steady state, so the oscillation will affect the operating system in a security and quality review. The entry of renewable energy in the Sulawesi interconnection system certainly has an impact on system stability and the emergence of electromechanical oscillations. An estimated 75 MW of power will come from the PLTB that will be built in Sidrap and 62.5 MW in Jeneponto. This study aims to analyze small signal stability due to the development of EBT generators on the Sulawesi interconnection system through eigenvalue characteristics and participation factors. The PLTB that will be integrated in the Sulawesi system certainly affects power flow which has an impact on small signal stability.
Maximum power point tracking based on particle swarm optimization for photovoltaic system on greenhouse application
Authors: Putri R I , Wiyanto S , Syamsiana I N , Junus M , Rifa’i M , Putra E S
Published: December 2019

The Greenhouse is currently a necessity for urban landless people. To save energy, it is necessary to install photovoltaics on the roof of a mini greenhouse to supply electricity. The use of PV is very dependent on climate, temperature, and irradiation, therefore MPPT (Maximum Power Point Tracking) is needed to obtain optimal power. In this paper MPPT for stand-alone PV system based on PSO using input voltage and current of the boost converter is presented. The performance of PSO is validated by Simulink with irradiance and temperature variations. The use of PSO can achieve maximum power for various irradiance. MPPT based PSO was compared by a PV system without MPPT. Based on simulation results PSO provides the power improvement by 29.98 W. Simulation results show that the system designed can optimize power produced by PV.
Techno-economic analysis of slip ring motor replaced by standard squirrel cage induction motor with VSD
Authors: Dewi H , Jufri F H , Hudaya C
Published: December 2019

Induction motor slip ring-type technology has been widely used in industrial as one of the crucial electrical components to convert energy mechanically. The construction of this motor is more complex than other standardized induction motors such as squirrel cage. The complexity lies in the connection between the rings and brushes which requires more maintenance. Meanwhile, Squirrel cage motor that is supported by a Variable Speed Drive allows its user to start motor smoothly and adjusts the speed more efficiently. In this study, we exclusively investigate the possibility of the outdated technology replacement by using squirrel cage standardized induction motor based on its compatibility and the financial perspective as well. To prevent any coming up problems, the selections of new motor and VSD must fulfil the requirement of the existing system. Technical data were collected from customer’s SCADA and nameplates. While the financial calculation was made based on the payback period. In this case, the payback period is projected within two years and the energy saving could reach 69% that basically depends on operation patterns. According to our perspective, standard squirrel cage motor potentially replaces the slip ring motor in which it is not only having a simple operation but also less maintenance and energy cost.
Evaluation of facilities learning practice at the Vocational High School in Electrical Engineering
Authors: Soeprijanto S , Yahya Y F , Media E
Published: December 2019

This study aims to determine the level of feasibility of practical facilities and equipment in the Private Vocational High School Electrical Engineering in the East Jakarta environment. The research method used is the Discrepancy Evaluation Model. The problems raised in this study are the extent of the feasibility of the space and equipment of the practice of electric power installation programs in Private Vocational High Schools in the East Jakarta region if examined from the National Standards for Vocational High School Facilities and Infrastructure in Indonesia. The research samples were 4 schools; determination Sample schools are conducted by proportional random sampling. The research was conducted in the 2017/2018 school year. The results showed that: (1) All (100%, N = 4) sample schools had a facility of electrical Power engineering installation the form of instructional space and practice space in conditions worthy. (2) All sample schools did not have a Basic Electrical Engineering laboratory. (3) When viewed from the standards of the Vocational High School practice equipment available in the basic installation practice room for Electric Power, in all sample schools were inadequate. Conclusion This study: shows that private Vocational High Schools in East Jakarta already have the facilities electrical practice is in the form of instructor rooms and practicum rooms, but it is not full supported by adequate practice equipment. The implication of this study is that private vocational schools in the East Jakarta environment need to meet the additional Electrical power plant installation equipment according the regulation Minister of Education and Culture Republic Indonesian number 34 of 2018 about National standard of vocational high school’s facilities.
The concept of the internet of things framework for remote monitoring of solar home system
Authors: Rumbayan M , Ruindungan D , Sompie S , Sambul A
Published: December 2019

The application of a solar home system in remote areas is needed to be monitored by real time. The Internet of Things (IoT) system is capable of performing data management for monitoring and evaluating the solar home system performance in specific locations. The data are then collected and transmitted to a system monitoring through the internet which then can be stored in cloud for further analysis. The purpose of this paper is to develop the concept of IoT architecture by measuring the parameter of photovoltaic panels for the selected remote area.
SMS Application in bird feed scheduling automation
Authors: Saputra D H R , Syahrorini S , Ahfas A , Jamaaluddin J
Published: December 2019

With the SMS application, it can be used as a medium for automation of bird feed scheduling, so that poultry farmers are easier to feed birds. Scheduling bird feed can be done continuously, with the aim of avoiding excessive amounts of feed. This application works according to the specified time of the bird owner. This application uses a servo motor to open and close the bird feed reservoir valve, the Microcontroller system as the main controller, SIM800L as a provider of information in the form of SMS, and RTC as a time scheduling system. Bird feed scheduling can be done per second. GSM is used to notify the owner when the system is running. Signal factors during experiments using GSM depend on bad weather or signals tend to be difficult when sending information to bird owners. The process of a servo motor with an angle of opening and closing itself between 0°-90° with a delay time of 50 seconds. For SIM800L a voltage between 3.8-3.9 volts is needed.
Street lighting efficiency with particle swarm optimization algorithm following Indonesian standard
Authors: Eriyadi M , Abdullah A G , Mulia S B , Hasbullah H
Published: December 2019

This paper aims the street lighting efficiency optimization of street lighting on Dr. Setiabudhi street, Bandung city. Particle Swarm Optimization (PSO) algorithm is used to get maximum lighting efficiency values with constraints in the form of lamp height, the distance between lights, lamp power, type/width of the street, the average illuminance and minimum illuminance according to Indonesian national standards (SNI) standards. Parameter optimization to obtain optimal values based on global standards and Indonesian national standards (SNI) has been done. PSO using MATLAB® (R2017a, MathWorks Inc, USA) has produced a street lighting optimization model with the level of lighting efficiency twice higher than the evaluation of existing conditions. Testing the results of the PSO algorithm shows a difference of 9.7% higher than the DIALux evo (8.0, Ludenscheid, Germany) software design. The test results show that the PSO algorithm can be used to obtain optimum lighting efficiency from a public street lighting system following SNI.
Development of a 500-1000 watt Pico hydro Hybrid Solar Power Plant prototype
Authors: Ratnata I W , Sumarto S , Saputra W S
Published: December 2019

In this study a prototype of a Hybrid Power Plant (PLTH) will be built that integrates the Pico-hydro Power Plant (PLTPH) and the Solar Power Plant (PLTS). The prototype of the PLTH to be built has a capacity of 500-1000 watts. From the making of the prototype-1 it was discovered that the PLTPH produced a maximum power of 86 W (from a capacity of 100 W) and the PLTS produced a maximum power of 30 W during bright weather and 23 W when the weather was dim (from a capacity of 100 W). The results of testing on prototype-2, it is known that PLTPH with a capacity of 600 W produces maximum power of 257.48 W and PLTS with 3 x 200 Wp (watt-peak) solar panels producing maximum power of 176.4 watts. After some adjustments, the electrical energy from these two sources is then stored in the battery. Electrical energy from PLTS is stored on the battery after going through the MPPT Solar Charge Controller; while the electrical energy from the PLTPH is stored on the battery after the electricity voltage is lowered and rectified with the rectifier. From the results of observations and measurements during testing, these two sources of electrical energy can charge the battery normally. Electrical energy from batteries that are direct current electricity is then converted into electrical energy alternating current of the power frequency to be supplied to the load, especially the electric load of alternating current.
Evaluation of trip generation and trip attraction of shopping centre on traffic performance in Denpasar city
Authors: Pratiwi N M W , Sriastuti D A N , Sumanjaya A A G
Published: December 2019

Teuku Umar St is one of the roads in Denpasar City with very high vehicle density and side barriers. This is due to the large number of activity centers that result in trip generation that affect the traffic performance, one of which is the Level 21 shopping centers. Traffic surveys are carried out on Teuku Umar St and Diponegoro St which are the exit gates of Level 21. Results This evaluation is obtained as follows (1) The traffic volume on Teuku Umar St is 4659.5 pcu/hour, with a V/C Ratio of 0.87 having a level of service at the level of “E”. (2) Traffic volume on Diponegoro St is 1948.5 pcu/hour, with a V/C Ratio of 0.71 having a level of service level “C”. (3) Operations of Level 21 shopping centers affect the performance of the Teuku Umar St segment by 315 pcu/hour for pulling and affecting the performance of the Diponegoro St section of 260.6 pcu/hour for generation. (4) Level 21 shopping center operations affect the performance of Teuku Umar St segment by 13.4% and affect the performance of Diponegoro St by 13%. Through the results of this study, it is necessary to study management handling of traffic.
Controllable and observable control design of wind generator system using PID algorithm
Authors: Setiawan B , Riskitasari S , Putri R I , Adhisuwignjo S , Syamsiana I N , Nurwicaksana W A
Published: December 2019

This paper describes a design process of the wind generator control system. Controlling a wind generator, fan, is important to study the design of the wind turbine. A complex wind generator model was approximated with 5th order polynomial function. The paper describes a procedure for identifying system, especially for finding the transfer function of a plant, that based on input and output. The plant’s input is an electric motor fan voltage and output is wind speed produced. It’s important to simplify control’s design of the wind generator for configuring transfer functions of the plant. The identification method that is used is Linear Regression, applying Excel program, which produces a polynomial function. And then, the Matlab’s System Identification Toolbox (SIT), which produces a transfer function. From this study, applying SIT, a model of wind generator, shows the fit estimation data is 90.78% and MSE is 0.078%. A closed-loop control system using PID controller is proposed. Controllable and Observable of the state space model were verified. The best performance of the close-loop system was achieved using Kp=0.2247, Ki=6.05*10-5, and Kd=208.75 applying Ziegler-Nichols. The results showed that the closed loop stability by applying PID can stabilize the wind generator.
Electronic control for optimizing power absorption of darrieus vertical axis wind turbine by adjusting angle of attack method
Authors: Setiawan B , Nurwicaksana W A , Syamsiana I N , Adhisuwignjo S , Riskitasari S , Joelianto G , Putri R I
Published: December 2019

This paper presents a mechanical design and electronic control for the angle of attack on the Vertical Axis Wind Turbine (VAWT) darrieus type with NACA0015 and 3 blades. This research was conducted to obtain high-efficiency absorption power on various wind speeds. The VAWT mechanical design is based on systematic calculations with a height of 150cm and a diameter of 120cm. NACA0015 airfoil with calculations in the NACA airfoil database obtained blade length of 15.892cm and width of 1.905cm. The electronic control on this system, Arduino mega controller, has input from an anemometer sensor, and rotary encoder sensor. While, the output is servo motors for 3 blade. A microprocessor control unit is programmed to control the adjustment of blade angle of attack. The angle of attack is defined by wind speed, angular speed of VAWT, and a defined TSR (Tip Speed Ratio). The angle of attack control method is PID (Proportional-Integral-Derivative) algorithm. By setting the TSR value constantly at 3-4, the angle of attack will be adapted even on any various wind speed. Expected result, the maximum power absorption will be obtained on various wind speed. This system can increase power efficiency of VAWT up to 35-40%.
Study of Nusantara Satu Satellite parameter evaluation for broadband application in Indonesia
Authors: Maruddani B , Sandi E , Dara W
Published: December 2019

This study aims to evaluate the performance of Satellite Nusantara Satu which has just been launched. Nusantara Satu Satellite is a broadband satellite that uses High Throughput Satellite (HTS) technology and uses Ku-band transponders to cover all regions in Indonesia. However, the use of Ku-band frequencies in Indonesia, which is located at a tropical region, must be evaluated because of the characteristics of the Ku-band frequency are very vulnerable to rain attenuation. In general, a broadband service requires link availability of 99.9% with a minimum speed of 100 Mbps. Our simulation results show that in the western part of Indonesia, to reach 100 Mbps with 99.9% link availability, the EIRP of the earth station VSAT is minimum at 79 dBW. In the central part of Indonesia, to reach speeds of 100 Mbps with 99.9% link availability, the EIRP of the earth station VSAT is minimum at 83 dBW. And in the eastern part of Indonesia, to reach speeds of 100 Mbps with 99.9% link availability, the EIRP of the earth station VSAT is minimum at 84 dBW.
Effect of Near-Dry Machining (NDM) on surface roughness through sustainable turning of mild carbon steel using coated carbide
Authors: Nur R , Suyuti M A , Mukhsen M I , Ikram I
Published: December 2019

Sustainable production as a global word, content important elements on all the fields as well as machining processes. Turning is one of the most fundamental and indispensable processes of metal removal in the industry. Increasing pollution preventing initiatives globally and consumer focus on environmentally conscious products has put increased pressure on industries to minimize or eliminate the use of cutting fluids. The use of Near-Dry Machining (NDM) in machining operation is one of the most effective strategies in this direction to achieve sustainable machining system. This study was purposed to determine the influence of NDM coolant system on surface roughness when turning of mild carbon steel, include power demand. A detailed comparison has been made with dry cutting to assess the process performance on the basis of surface roughness and power demand. The results indicate that providing a reduction on surface roughness and power demand more effectively than dry cutting at high-speed conditions, thereby to achieve sustainable machining system.
The effect of mother channel width on biometric flow field towards polymer electrolyte membrane fuel cell performance
Authors: Fahruddin A , Ichsani D , Taufany F , Widodo B U K
Published: December 2019

Leaf shape biometric design shows promising potential as a flow field to supply air reactants in Polymer Electrolyte Membrane Fuel Cell. However, studies that discuss the dimensions of biometric flow field in detail are rarely encountered. The channel width can affect the supply of reactants, the better the supply of reactants the better the cell performance can be achieved. In this study we investigated the effect of the mother channel width on the biometric flow field towards cell performance using numerical simulations. The model is composed of 9 layers with 25 cm² of active area. The channel dimension is varied by considering Murray’s theory. Simulation results show that the optimal width of the mother channel can increase power density by up to 6% compared to other variations. This increase can be achieved due to a more uniform distribution of oxygen concentration.
Optimizing machining time for CAD / CAM milling programming using the Taguchi method
Authors: Mulyadi M , Alfiansyah W , Akbar A , Firdaus R , Andita N F G
Published: December 2019

The CNC milling machining process is a very important process in manufacturing products because it affects the profitability of the production process. CAD / CAM programming software tools speed up the process and predict the production process time. This study uses CAD / CAM simulation of HSM operations and uses the Taguchi method which is a method that can optimize process variables to get a good response. Process variables chosen are Speed, feed rate, depth of cut, step over, stay on surface and radius link. The type of tool used is an end mill with a diameter of 20 mm SECO Jabro-Solid-JS554 standard. The results of the study stated that the HSM machining simulation process that had a greater influence on machining time was feeding 680 mm / minute and 5 mm depth of cut. The experimental results confirm the ideal time produced is 34.25 minutes.
Modelling of regenerative braking system for electric bus
Authors: Islameka M , Leksono E , Yuliarto B
Published: December 2019

Regenerative braking is a way to harvest electric energy from braking mechanism which usually implemented in electric vehicles. Braking strategies are required to maximize the use of regenerative braking systems. This research aims to design a regenerative braking model for a medium-sized electric bus. Measurements of latitude, longitude, elevation, and speed were firstly conducted by using GPS-based OsmAnd Android application. Transjakarta Corridor 1 (Kota-Blok M) was used for a test track with a distance of 14 km. Besides using data from measurements using GPS, WLTP (Worldwide Harmonised Light Vehicle Test Procedure) data is also used for comparison. This study produced a braking strategy model that considers aerodynamic, rolling, and grade resistances as well as electrical component specifications of the electric bus. The model design is then compared to the existing serial and parallel strategy. With the design of this system, the regenerative braking model can harvest more energy which increases the mileage of the electric bus.
Immersion cooling as the next technology for data center cooling: A review
Authors: Kuncoro I W , Pambudi N A , Biddinika M K , Widiastuti I , Hijriawan M , Wibowo K M
Published: December 2019

The utility of the world internet is on the rise as it is recorded that 46% of the world’s population have become internet users who generates data traffic of up to 8 zettabytes daily. This increase has triggered the growth of data center infrastructure as processing, storage and communication system in the digital world. The data center itself has contributed 1.5% to the total world electricity consumption and this is expected to increase with time. The proportion of energy used in the data center covers 52% for information technology (IT) equipment, 38% for cooling and 10% for supporting devices. One of the problems faced by these centers over the years is the cooling of the information technology (IT) components. This paper describes a cooling model that has the potential to improve the efficiency of energy used in data centers. Numerous studies have been carried out and one of them involves the use of immersion cooling technique as it promises improvements in the energy efficiency of data centers, using dielectric fluids that have high heat capacity. Several types of fluid used in this method are identified and discussed in this paper.
Barriers to the adoption, acceptance and public perceptions of Electric Vehicles (EV) in Indonesia: Case studies in the city of Surakarta
Authors: Syamnur F H , Pambudi N A , Biddinika M K , Wardani N S
Published: December 2019

Electric Vehicle (EV) is one of the technologies in the transportation industry that reduces the amount of toxic emissions. However, EV faces some technical difficulties in terms of the implementation as its application is still far from competing with Internal Combustion Engine (ICE) vehicles in numerous countries. The public acceptance of EV is considered an obstacle, hence, this study will further examine the public perceptions of price, performance, infrastructure and acceptance of this technology. Furthermore, an incentive policy was offered to the respondents as the survey was carried out using a quantitative approach in Indonesia with Surakarta City residents as the population. The results of this study contribute as a reference for policy makers to draft energy plans and transportation policies and as a discussion material for EV companies in their development.
Organic Rankine Cycle (ORC) in geothermal power plants
Authors: Hijriawan M , Pambudi N A , Biddinika M K , Wijayanto D S , Kuncoro I W , Rudiyanto B , Wibowo K M
Published: December 2019

Organic Rankine Cycle is a technology that convert low-temperature heat sources into a mechanical energy, and it can be used to produce electrical energy in a closed system. The heat sources can be received from renewable energy such as geothermal, solar, and biomass. Furthermore, the ORC system can also be used to increase energy efficiency in the industry by utilizing the waste heat produced. Therefore, there are two classification of the ORC system, namely a heat recovery system and binary power plant. Recently, the ORC system has made a thrive in the geothermal power plant. The ORC system can be applied to resources with low to medium temperature characteristics (<90°C - 150°C). This paper will present an overview of the implementation, model, and innovation of ORC system technology in geothermal resources.
Microwave absorption properties of single and double-layer absorbers based on BaFe12O19 and SiO2
Authors: Marpaung M A , Handoko E , Jalil Z , Alaydrus M
Published: December 2019

In order to study a new microwave absorption properties of single and double layer barium hexaferrite and silica have been investigated in X-band (8.2–12.4 GHz) frequencies. Barium hexaferrite BaFe12O19 was synthesized by ceramic method and Silica SiO2 was prepared from beach sand. Barium hexaferrite and silica SiO2 with a total thickness of 3 mm, 4 mm, 5 mm, 6 mm and 7 mm, were characterized at room temperature using vector network analyser (VNA) Keysight PNA-L N5232A. Reflection loss (RL) of single and double-layer absorbers of barium hexaferrite and silica were calculated and simulated using the transmit line theory. The minimum RL value (less than − 10 dB) of single layer barium hexaferrite is −21 dB at 9 GHz. The minimum RL values (less than − 10 dB) of single layer silica SiO2 is −40 dB at 9.2 GHz with 4 mm of thickness. The results show that double layer absorbing material showed different RL values than single layer of barium hexaferrite BaFe12O19 and silica SiO2.
Profile affective abilities of vocational students in electrical energy conservation
Authors: Kurniawan A , Rustaman N Y , Kaniawati I , Hasanah L
Published: December 2019

The purpose of this study is to obtain an overview of the profile of the affective abilities of vocational students concerning the discourse of electrical energy conservation. The research method used is qualitative research which aims to explain the phenomenon of problems experienced by students in understanding the concept of electricity. Research activities are carried out in the odd semester of the school year 2017/2018. The research subjects were students of class X in one of the private vocational schools in the city of Bandung which consisted of one class randomly selected. The results showed that the profile of affective ability which is a result of the representation of the value / energy-saving attitude of students in SMK S Bandung was still low. This can be seen from the average value of affective goals which include a willingness to respond, satisfaction in response, acceptance of a value, preference for a value, commitment, and conceptualisation of a value of 43.83 which is still in the low category. This shows that physics learning, especially on the concept of electricity at the SMK level has not been oriented towards affective goals.
E-mulsi: The digital module for pharmacy physics lab work
Authors: Dhina M A , Hadisoebroto G , Mubaroq S R , Puspa R V M , Deswati D A
Published: December 2019

Pharmacy Physics is a science that combines the knowledge of physics and pharmacy. The combination of them results in the preparation of an excellent standard pharmacy, significant effect, and it has a superb stabilization as well. Ideally, the practicum of the pharmacy physics has to be able to increase the knowledge from theory material and enhance the impetus to develop a particular understanding. The function of student’s practicum gets real proof from the concept that has studied so that the practicum activity should be able to take a role as a bridge between theory and real-world in daily activities. This research is attempting to create a particular application that is used for a learning tool when practicum’s education is happening in the pharmacy physics lab, named e-mulsi. An app that’s created web based aplication, so that it can be accessed by using any device that students have. The pattern that’s used to develop the application of e-mulsi is by using the method of the Software Development Life Cycle (SDLC) waterfall model. The effort of this design is hoped to give the alternative learning tool that’s suitable for the future development direction and capable of taking the benefits from the technology that’s still advancing, especially Industry’s revolution 4.0.
A study of radiation dose for the anticipated accident condition in the SAMOP reactor experimental facility
Authors: Salam M , Supriyatni E , Syarip S
Published: December 2019

A study of radiation dose for the accident condition in the Subcritical Assembly for 99Mo Production (SAMOP) reactor experimental facility has been done. The main purpose of this study is to estimate the radiation dose received by worker as well as society during accident condition in the SAMOP reactor experimental facility. In this study, one of the worst accident scenario that has the highest probability is postulated as one of TRIGA fuel fall down in to the SAMOP reactor core during loading-unloading process. That accident inflicts one of this TRIGA fuel broken and radioactive materials are released. The radiation dose is estimated based on the radioactive source-term from ORIGEN 2.1 computer code calculation. Furthermore, the total effective dose equivalent (TEDE) received by the society is calculated using dispersion model of Hotspot 3.0 computer code. From this study, the total radiation dose received by the radiation worker during this accident condition is 4.5 mSv and the maximum TEDE received by society during this accident condition is 0.031 mSv. This study proves that the radiation dose received by worker as well as society during this accident condition is still below the limit appointed by regulatory body (BAPETEN).
Analysis of fission product gas pressure and radioactivity in SAMOP reactor experimental facility
Authors: Syarip S , Wahyono P I , Budisantoso E T
Published: December 2019

The fission-product gas pressure and radioactivity analysis of a subcritical assembly for 99Mo production (SAMOP) experimental facility have been done. SAMOP reactor is fueled with low enriched uranyl nitrate solution UO2(NO3)2 of 300 g U/L, the reactor core is in the form an annular tube surrounded by a ring of fuel tubes. The SAMOP system is designed to be operated at 100 to 120 hours periodic operation per batch. The analysis method is done by using ORIGEN2 computer code, at the condition of the maximum fuel temperature of 54 °C, 120 hours reactor operating time, and neutron flux varied from 1010 to 1012 n/cm2s. The result show that the inventory of the gaseous fission products is dominantly consisted of the xenon, radium, helium, and tritium isotopes with the total activity of 1.3775x1013 Bq (372.29 Ci) and total gas volume of 0.0986 cm3 or giving a total gas pressure of 5.78 kPa. The isotopes of xenon and krypton are the major contributors to the total gas pressure. The analysis result shows that the gas pressure of the fission products is very small, therefore the pressure monitoring in the SAMOP reactor core is not necessary.
Interpretation of Conventional Reciprocal Method (CRM) refraction data for identification of subsoil structure in the tourism area at Batu Kuda Bandung
Authors: Nurasiah S , Muhammad F H , Agustina R D , Sugilar H
Published: December 2019

The purpose of this study is to identify the subsurface geological structure by using the seismic refraction method in the Wana area of Batu Kuda tourism using Seismic Data Interpretation Refractive Conventional Reciprocal Method (CRM) which aims to produce a GUI. Data obtained in the form of wave propagation time as time forward and time reverse, from the travel time of the wave and distance and time geophone analysis. From the results of the data interpretation, the velocity of P wave propagation in the medium and depth is obtained in 2 layers. In the first layer obtained a velocity value of 628.98 m / s with the depth of the first layer ranged from 0 m - 8.73 m and the seismic wave velocity in the second layer was 1228.99 m / s with the depth of the second layer ranged from 8.73 m - 20 m. Based on the 2D model the distribution pattern of velocity values, it can be indicated that the first layer is the latosol soil layer containing sand, gravel, fine sediment and clay. The second layer contains fine deposits, sandstone, gravel, sand, fine sand (silt), clay and clay. These materials as a result of the process of the eruption of an undefined young volcano.
Theremin as teaching aid to improve student understanding of waves
Authors: Ambarwanti D , Astra I M , Yaqin A A , Sugihartono I
Published: December 2019

Physics learning is taught to equip students with knowledge and understanding of various natural phenomena. In order to improve comprehensive understanding of waves principle for student class of XI, we implement science, technology, engineering, and mathematics (STEM) in physics learning by using theremin based light dependent resistor (LDR). In this paper, theremin as music instrumental non-contact will be used as teaching aid. Physics understanding of the students will be observe and investigated during a class. Analyses will be focus on adjustment of frequency will provide pitch of tones. As results, by theremin, student will have better understanding of waves principles.
Development of Android-base media on the point of glass and lens
Authors: Setya W , Zakwandi R
Published: December 2019

Android gives a great revolution to the world of education to develop learning applications that facilitate its use to study anywhere and anytime. This study aims to make Android-based media using app-inventor on glass and lens material. The development of this media uses R & D (research and development) research and development methods which consist of 4 stages, namely the analysis phase, design stage, production stage, and evaluation stage. The results of using Android-based media have an average value of questionnaires from material experts, media experts, and small-scale trials categorized very well close to 50%. Based on these results it can be stated that the lens and glass media based on Android can be used as a medium of learning in the classroom. The development of this Android-Based Physics Application is expected to be an alternative for educational institutions or educators to develop learning media that use multimedia.
How is STEM learning for children with special needs in Indonesia?
Authors: Hudha M N , Triwahyuningtyas D , Rafikayati A , Fajaruddin S , Maryani I , Widiaty I , Nandiyanto A B D , Hamidah I , Permanasari A
Published: December 2019

This paper is a preliminary study aiming at discovering information on STEM learning for children with special needs in Indonesia. The method used in this study was descriptive qualitative using a questionnaire and interviews with teachers, parents, and students with special needs as the research instruments. It is concluded that the students needed more effective media in STEM learning.
Theoretical study on the effects of polarons on the transport properties of anatase TiO2
Authors: Bupu A , Majidi M A
Published: December 2019

We present a theoretical study on the effects of electron-phonon interactions on the transport properties of anatase TiO2. Temperature-dependent resistivity measurement on anatase TiO2 thin film has shown that carrier concentrations and temperatures affect the resistivity of this material. At low carrier concentrations, a metal to insulator transition could be observed, while at high carrier concentrations this material only shows metal-like resistivity. In this study we aim to investigate the behaviour of temperature-dependent resistivity at various carrier concentrations as revealed in the experimental study. We hypothesize that electron-phonon interactions with intermediate coupling constant govern the transport properties of this material. We construct Holstein model Hamiltonian incorporating both conduction and valence bands of anatase TiO2 within parabolic dispersion approximation. We solve the model within the Dynamical Mean Field Theory (DMFT). We calculate the density of states of the system and the corresponding inverse of the square of the density of states at the chemical potential, which is approximately proportional to the resistivity, as a function of temperature. Using carrier concentration values taken as in the experimental data, the calculations show that only insulating phase is found in the low carrier concentrations regime. Meanwhile, at high carrier concentrations, the results show metal-like properties, in agreement with the experimental data.
Effect of agility ladder exercises on agility of participants extracurricular futsal at Bina Darma University
Authors: Hidayat A
Published: December 2019

The purpose of this study was to determine the effect of agility ladder training on the agility of the student of the futsal extracurricular Bina Darma University Palembang. The research method used in this study is a quasi-experimental method. The design of the research design used in this study was one group pretest-posttest design. A sample of 24 people participated in the Bina Darma University futsal extracurricular activity. The technique of collecting data uses an agility test instrument, namely Illinois Agility Run. The element of agility is very dominant in helping students gain student fitness. Usually students who are fit are characterized by good physical condition (agility). Agility in students is very useful to develop students’ skills in any field of sports in general, and can help students master the physical education subjects related to agility. The results of the study revealed that the average score of agility pretest obtained by students was 19.05 seconds while for the average value of posttest (final ability test) student agility was 18.99 seconds. Normal and homogeneous distributed data because the results of the Kolmogrov Smirnov test and the data homogeneity test show that the large sig value is 0.05, so that it is continued with the paired t-test results obtained that the t-count value 1.930 is greater than the t-table 1.714 at a significant level of 0.05%. Thus it can be concluded that there is a significant influence agility ladder training for agility at participant’s futsal extracurricular Bina Darma University of Palembang.
Application foam agent to foam cement slurry for geothermal well drilling
Authors: Hamid A , Setiati R , Santoso A
Published: December 2019

One type of light weight cement is foam cement which can be used in cementing operations in weak zones with the possibility of small fractures and reducing the amount of light weigh cement suspension levels. The foam cement suspension can be used to solve lost circulation due to natural vertical fractures or cavernous formations. The purpose of this study was to determine the potential of foam cement slurry to solve the lost circulation in geothermal well. Making slurry cement uses class G cement at 200 mesh and 100 mesh size with the composition of cement. The cements put into the waring blender containing water stirit for 35 second, adding foam agent into cement slurry with variations in foam agent concentration of 0.03%, 0.06%, 0.09%, 0.12% and 0.15%. observations of foam cement above were carried out for 30 minutes to test the stability of bubbles in the mixture. The result this study showed different compressive strength values at variations the concentrations of foam agent. The strength value is strongly influenced by result of sample with 0.03% with Sika-aer concentration have a compressive strength value of 3745 psia, while sample with Sika-aer concentration of 0.15% have compressive strength value of 1701 psia. The value of compressive strength core foam cement can form a linear line according percentage foam agent concentrations. Foam agent between 0.03% - 0.15% with Sika-aer qualified the minimum requirements BHCT compressive strength according API-10B rules to reduce severity lost circulation in the well X-E2 in geothermal drilling well.
The effect of β-Carotene (C40H56) in Carrots (Daucus Carrota) as a natural additive substance for wet noodle durability
Authors: Rohayat A , Ardiana C , Nurkhotimah R , Hernawati D , Mulyaningsih S
Published: December 2019

Additives are chemical compounds added to maintain food including wet noodles. The durability of wet noodles is relatively lower compared to other staple foods. There are many ways to preserve wet noodles, one of which is natural additives. Natural additives are chosen because they are safer and do not pose a risk to human health. Substances Natural additives used are carrots (daucus carrota). Because carrots contain β-Carotene compounds that function as antioxidants. Where can reduce and deactivate free radical attacks and ROS (Reactive Oxygen Species) to foods caused by microorganisms. The study aims to influence the content of β-Carotene in carrots as a natural additive for the resistance of wet noodles. The research method used was an experiment with variations in the concentration of β-carotene in carrots 0%, 20%, 40%, 60%, and 80%. From the results of the study it was found that at the β-Carotene concentration of 60%, the durability of wet noodles reached a maximum of 4 days. This fact shows that the addition of β-Carotene with high concentration will affect the durability of wet noodles. So that shows that carrots (daucus carrota) can be used as natural additives in maintaining the durable power of wet noodles.
Antioxidant capacity of Dillenia sp. leaf extract against DPPH (1,1-Diphenyl-2picryl Hidrazil) radical
Authors: Rahayu S , Zahara I , Afifah A , Arya P K , Supriyatin S
Published: December 2019

Some plants have capacity as exogenous antioxidant. Simpor (Dillenia sp.) is plant of the Dilleniaceae family which may have the property of antioxidant. The purpose of this study was to measure the antioxidant capacity of the 96% ethanolic simpor leaf extract. Factorial design was applied with 2x3 factors of maseration time (24 and 48 hours) and concentration series of (10, 15, 20%). Normality was done by Kolmogorov-Smirnov and homogeneity by Levine. Data was analysed by ANOVA (ᾳ = 0.05). Post Hoc was analysed by Duncan. Antioxidant property was analysed qualitatively and quantitatively on flavonoid and also leaves water content. The antioxidant capacity assay was measured using DPPH (1,1-Diphenyl-2picryl Hidrazil) scavenging ability at 517 nm with ascorbic acid as control. The result showed that water content of the plant was 73.65%. Simpor contain flavonoids with highest flavonoid content (2.953 mg QE / mg) in 24 hours maceration time at 15% concentration. Furthermore, it also has ability to scavenge DPPH (1,1-Diphenyl-2picryl Hidrazil) radical with the highest value (97,10 ± 0,01%) in 24 and 48 hours maceration at 20% and 10% extract concentration. Statistical analysis on flavonoid content showed that time and concentration gave significant effect on flavonoid content (ᾳ = 0.003). Duncan result revealed that almost all groups didn’t significantly different only the 24 hours x 15% concentration was. DPPH inhibition based on statistic proved that both factors didn’t affect scavenging ability of Dillenia (ᾳ = 0.079). It can be concluded that simpor leaves has antioxidant capacity against DPPH radical due to its flavonoid content. Furthermore, concentration and maceration time significantly affect flavonoid content and didn’t affect DPPH radical scavenging ability of Dillenia plant.
Chlorpyrifos organophosphate and essential oils activities against Callosobruchus maculatus (F.) warehouse pests
Authors: Subekti N , Nur H , Fanidya A , Susanti S , Saputri R , Indrawati P
Published: December 2019

Callosobruchus maculatus (F.) is a warehouse pest causing damage to foodstuffs, especially beans. One of techniques that usually used for preserving foodstuffs from insect’s attack in Indonesia is by using chemical pesticides and fumigants. The continuous use of chemicals can disrupt human health and pollute the environment. Pest control using essential oils is considered safer than chemicals and environmentally friendly. The essential oils that used in this study were A. nardus, E. globulus, and M. piperita. Nanoemulsion essential oils were made to reduce evaporation. The aim of this study is to find out the insecticidal activity of chlorpyrifos and three kinds of essential oils against Callosobruchus maculatus (F.). Research methods of this study consisted of sample preparation, fabrication of essential oils, mortality test and repellency test. The results showed that chlorpyrifos pesticides still have higher percentage of against insecticides compared to essential oils, but their use was not environmentally friendly.