bluuebunny/crossref_metadata_2025 huggingface dataset:
Nutrient fulfilling status for bali cows in Bali, Indonesia in season differences
Authors: Sudita I D N
Published: December 2019

This study aims to determine the number of nutrients given in feed for Bali cows in different seasons. The study used a survey method through observations on 27 livestock groups in Bali by measuring the amount of feed given, diversity of feed ingredients, and sampling of feed ingredients for analysis. Measurements were made on three season (the rainy, mid-dry, and the peak of the dry-season). The results showed a decrease in the type and diversity of feed ingredients in the ration, while the amount of ration given (kg/day of fresh weight) was almost the same (33.17 kg, 33.15 kg and 32.82 kg). The total protein available in the ration was decreased in the rations given, namely: 706.52 g (rainy season), 648.65 g (mid-dry season), and 611.37 g (peak dry season). While the total energy tends to increase according to successive seasonal changes: 12,650.7 kcal ME, 13,820.18 kcal ME, and 13,974.21 kcal ME. From this study, it can be concluded that although there is a decrease in the type and diversity of feed ingredients in the rations given to Bali-cows according to the season in Bali, but the amount of protein and energy above the basic livelihood needs of livestock.
Microplastic abundance in the water, seagrass, and sea hare Dolabella auricularia in Pramuka Island, Seribu Islands, Jakarta Bay, Indonesia
Authors: Priscilla V , Sedayu A , Patria M P
Published: December 2019

This research focused on the amount of abundance of microplastics in the sea hare Dolabella auricularia as well as the seagrass fields along the southern coast of Pramuka Island. Sampling of 8 individuals of Dolabella auricularia along with seagrass Cymodocea rotundata leafblades was done at the southern coast of Pramuka Island, after which the samples were preserved and brought to a laboratorium in Depok for microplastic analysis. The sea hares’ digestive tracts were extracted and dissolved in strong nitric acid. A 1 cm2 portion of a seagrass leaf blade was cut for observation. Prepared samples were observed under a monocular microscope and further analysis was done. Microplastic fibers and film particles were found in highest abundance within the digestive tracts of each sample of Dolabella auricularia as well as on the seagrass surface where the sea hare obtains its algae from, with fragment particles found in much lower amounts. Overall, number of microplastics was found between 40.1 to 73.7 particles/g weight of sea hare digestive tract and the estimated amount of microplastic found at seagrass leafblade was 185 particles/cm2. Results provide evidence that microplastics in the ocean brought by water currents could adsorb on to algae through which it enters the food chain as it is consumed by marine biota.
Training and development of Internet of Things creative industry entrepreneurship models for UPI students
Authors: Hasan B , Hasbullah H , Purnama W , Kustiawan I
Published: December 2019

Today the development of electronic technology has reached the generation of the Internet of Things. IoT is a collection of objects (things), in the form of a physical device (hardware) that is able to exchange information between sources of information. The development of creative industries through IoT is expected to be a solution to keep entrepreneurship among students who will contribute to economic development. This Entrepreneurship PKM Activity was attended by 35 students from various study programs in the environment of DPTE FPTK UPI, and they followed this activity carefully starting from the stages of preparation, implementation, apprenticeship to the partner industry until the evaluation stage. Various innovative creations that combine technology with IoT utilization have been generated from the results of training activities, including, Smart Home, Automatic Glass Mixer With Blynk, Smart Building and Motor Controller. It is finding the future challenges and the existence of these business opportunities and as an effort to develop entrepreneurship in the field of information technology, especially those based on creative industries through the use of the Inetet of Things for UPI students, this PKM activity is one means to realize economic growth both locally, regionally and internationally.
Performance analysis of Light Emitting Diode, High Sodium Pressure and Metal Halide Lights
Authors: Hamas I M A , Abdullah A G , Hakim D L
Published: December 2019

Light Emitting Diode (LED) lamps have been widely applied to street lighting in every country, but not a few still using conventional lamps like High Pressure Sodium (HPS) and Metal Halide (MH). This research presents the results of evaluating efficiency and photometric performance from street lighting lamps. The level of illumination and uniformity ratio will be calculated to make a quantitative comparison between LED lights and conventional lamps according to Indonesian National Standards. Research carried out on three different Street Lightings in Bandung with three different lights specification. Conditions in the field will be simulated using DIALux software. The results of this research are obtained that LED lamp is the most effective and efficient type of lamps compared with conventional lamps. This Research will be useful for the Public Works Agency in making decision on the selection of the new lamps technology for street lighting, determining the type of lamp should depends on needs and light quality.
The prototype of SCADA application in the school building
Authors: Ikhsan A F , Rukmana A , Suarsa A C , Masykur M , Wiharso T A
Published: December 2019

The complexity of electrical installation in a building will depend on the function or operation of the building in question. On the other hand, power supply is very important to support the building operation. However, it is very often difficult to locate which point in the power distribution system that experience electrical fault. This study attempts to solve such problem by designing a prototype of monitoring and controlling system of power distribution in school buildings. To this end, we use Arduino-based system and Wonderware InTouch for the user interface. This study resulted in a power monitoring system consisting of voltage sensor and electric relay connected to Arduino ATMEGA 2560. The system can be configured, monitored and controlled through a computer software.
Design and implementation of planar phase shifter for radar at frequency 2.9 GHz – 3.1 GHz as beam-steering
Authors: Hamidi E A Z , Arifin A I , Soedarsono S , Siddiq S F
Published: December 2019

Nowadays in Indonesia, 3D Radar has been developed to perform a vertical scanning that has multi-functional benefits in telecommunication industry and defence. As a common practice, 3D radar system is frequently used to measure the distance of an object like the aircraft. Therefore, the most important element in radar systems is the phase shifter that has a main role in steering the beam and replacing the rotator function. This final research will focus on the operation of simple Phase Shifter with concerning a 2,9 GHz – 3,1 GHz radar frequency. Phase shifter designed at 3 GHz as the centre frequency within a value return loss ≤ -15 dB, insertion ≥ -4 dB, coupling ≥ -4 dB, isolation ≤ -15 dB, phase difference 45°, 90°, 135°, phase error ≤ 15°, and realized by converting into Microstrip Quadrature Hybrid Coupler 90°. These particular phase shifter uses the type of substrate Rogers R04035B with dielectric constant values (εr
) at 3,48, and the thickness of the substrate ( h ) of 1,524 mm. Simulations are performed using Computer System Technology ( CST ) software suite 2015 and assigned the average results each port to return loss value -37,290519 dB, insertion -3,154242 dB, coupling -3,164594 dB, isolation -32,714140 dB, with phase difference 45,00816°, 89,09566°, 90,76276°, 134,85057° and phase error 0,00816°, 0,90434°, 0,76276°, 0,14943°, It is then subsequently realized and measured by Netwotk Analyzer and return loss -30,078370 dB, insertion -3,229792 dB, coupling -3,146129 dB, isolation -42,651590 dB, phase difference 45,15190°, 86,38080°, 93,38538°, 134,36260° and phase error 0,15190°, 3,61920°, 3,38538°, 0,63740°.
The prototype of automatic garbage carrier from a small scale drain using Arduino Uno
Authors: Wiharso T A , Susilawati H , Yahya M A
Published: December 2019

As the downpour keeps coming continuously, overflowing water is emerged from a small scale drain due to the garbage that clogs the culvert on the drain. The purpose of this research was to overcome or reduce the incidence of the overflowing water on the culvert. The method used in this research was the prototypinmethod using microprocessor of Arduino Uno and load cell sensor. The results achieved in creating this system had already facilitated the transport of garbage and automatically detected full garbage. Therefore, this could reduce the amount of garbage located on a small scale drain and the risk of occurrence of overflowing water. This prototyping could be used for large scale in addition to the culvert.
The study of the wideband planar sleeve antenna
Authors: Rohadi E , Adzikirani A , Siradjuddin I , Rasyid A , Adhisuwignjo S , Darmawan Y , Amalia A
Published: December 2019

In this paper, the wideband planar sleeve antenna with two sleeves on the upper side and two sleeves on the bottom side are analyzed numerically. In the previous study, the wideband planar sleeve antenna is used at frequency 3.5 GHz. The purpose of this research is addressed to analyze the wideband planar sleeve antenna in the range frequency of 400-4000 MHz by using WIPL-D EM Simulator by adjusting the antenna parameter. The antenna upper sleeve, lower sleeve, the length of the antenna and the gap between the lower and upper sleeves are adjusted. The result shows that the wideband planar sleeve antenna is achieved. When the length of the upper sleeve is increased, the antenna will work at lower frequency but the return loss slightly reduced, the same effect occurred by increasing the lower sleeve size, but it doesn’t affect at the lower frequency. When the antenna length is increased, the return loss of the antenna is reduced. Furthermore, the distance between the lower and upper sleeve affects the return loss characteristic. This is indicated that by adjusting the length of the antenna parameter, the antenna is applicable for many systems, such as television system and the ISM system.
Design and analysis of a radiant charger using 5 coils and 5 poles of neodymium magnet as a rotor drive
Authors: Hidayat M N , Santoso R , Syamsiana I N , Setiawan A , Djulihenanto S
Published: December 2019

A radiant charger is a free energy device that can be applied to produce electricity. The term free energy means that this equipment does not use fuel, such as fossil fuel to produce energy. This research aims to design and analyze a prototype of a radiant charger using five coils and five neodymium permanent magnets. In this research, a primary battery is needed as a source to generate mechanical work to rotate the rotor, a coil and a transistor is also needed to charge a secondary battery before the primary battery runs out. The results of the design and testing of the device produces a rotor rotation of 1020 rpm at 346 volts.
Intermittent Renewable Energy Source (IRES) model of solar energy in Cipayung microgrid system
Authors: Tambunan H B , Pramana P A A , Munir B S
Published: December 2019

Indonesia has a great solar energy potential because its location is in a tropical area. One significant characteristic of solar energy is intermittent. Integration of intermittent renewable energy source (IRES) especially solar energy into electrical power grid can cause significant impact in power system stability. This study aims to model the IRES characteristic, profile, and time duration classification based on collected data in Cipayung microgrid system. The result shows the characteristic of IRES consist of two things, a sudden increase and suddenly decrease of solar source. These characteristic profile model is made by a polynomial and logarithmic regression analysis using mathematical equation. A condition where the availability of solar energy is immediately at a maximum or at a lowest point of zero has never been found. The very fast IRES classification occurs the most often with 0.5 to 1.0 minutes of time duration. System operator can use this information to prevent the system from collapsing and even having a blackout.
Fuzzy Maximum Power Point Tracking (MPPT) controller for photovoltaic system on mini greenhouse
Authors: Putri R I , Setiawan H , Irawan B , Yunus Y , Patma T S , Pradani E R K
Published: December 2019

Greenhouse is currently used is urban farming. Smart greenhouse technology allows farmers to monitor their plants easily. This system requires much electrical energy supply. In order to save energy, additional electricity supply is needed. For this reason, photovoltaic is installed on the roof of the greenhouse. The obstacle in the installation of photovoltaic cells is that the power produced is not optimal, due to the movement of the sun’s position. For this reason, Maximum Power Point Tracking (MPPT) technology is used. In this paper, fuzzy logic was used for MPPT based on I and V from PV. The aim is to find the maximum operating point of a photovoltaic module so that it can increase the output power ratio of photovoltaic modules in varying temperatures and radiation levels. Simulation is done using MATLAB, so that a ratio of output power ratios is generated with and without using an MPPT. By using the fuzzy MPPT controller, it produces optimum power, at P PV max = 250 W, P out max = 160 W, P PV max = 174.8 W, P out max = 125 W, P PV max = 98.97 W, P out max = 75 W. This power will be used to supply electricity for 2 15 W lamps, 12 volts for the mini greenhouse.
Fire disaster early detection system in residential areas
Authors: Kamelia L , Ismail N , Firmansyah A A
Published: December 2019

The number of residential fires in urban areas is increasing every year. The use of automatic fire detection technology can prevent greater fire disaster losses. The fire detection system works by detecting increasing degrees of heat, ultraviolet radiation by flames, and gas leaks. The system will start automation if the LM35 Temperature sensor, MQ2 Gas sensor, and Light Dependent Resistor (LDR) detect the occurrence of fire according to the initial settings on Arduino Uno. After Arduino Uno processes input data from the sensor, there will be a notification marked with the Buzzer and a text will appear on the Liquid Crystal Display (LCD) that describes the condition of the sensor reading. Arduino Uno configures data via the GSM SIM900A Module. The last process is sending short messages (SMS) from the GSM SIM900A Module to the receiver to notify the initial warning of a fire. the delay time in testing the farthest distance (100 cm) is as follows: LM35 140 second Temperature Sensor, 130 second MQ2 Gas Sensor and LDR 145 seconds.
Study of LoRa (Long Range) communication for monitoring of a ship electrical system
Authors: Setiawan B , Putra E S , Siradjuddin I , Junus M , Dewatama D , Wiyanto S
Published: December 2019

This paper presents a study of long range (LoRa) communication for monitoring of a ship electrical system. Three categories of electrical system include generator, power distribution, and navigation are monitored. A low power communication technology of LoRa is used to transmit electrical variables such as current, voltage, and power are logged and sent to the server. Experiments using LoRa SX1278 and Arduino have been inducted to validate the performance of the communication. Three spreading factors 12, 7, 6 have been tested. From experiments results, the performance of the communication has been analysed, if has been found that 97% successful data transmission was achieved with maximum distance. Furthermore, small baud rate communication was more suitable for the application.
A study of a discrete Bayes and a Kalman filter computational Complexity and performance in the case of 1D robot localization
Authors: Siradjuddin I , Fitriani I M , Asmara R A , Junus M , Patma T S , Azhar G A , Setiawan H
Published: December 2019

In the robotic field of study, localization is one of the important methods for autonomous mobile robot navigation. Probabilistic approaches have received significant attention in the robotics community. The discrete Bayes and Kalman filters are the fundamental algorithms in probabilistic approach which have to be clearly understood in order to develop more advanced filtering algorithms. This paper discusses discrete Bayes and Kalman filtering algorithms. The mathematical representation of each filter algorithm, in the 1-dimensional case, presented in detail. The algorithms were implemented using python to simulate the probability of the robot position. The algorithm’s complexity was analysed with respect to the computational cost and size of memory used. From this study, it has been observed that the Kalman filter is computationally more efficient, and less memory is required.
Design of two stage low noise amplifier at 2.4 - 2.5 GHz frequency using microstrip line matching network method
Authors: Maruddani B , Ma’sum M , Sandi E , Taryana Y , Daniati T , Dara W
Published: December 2019

This study aims to design a Low Noise Amplifier (LNA) with two-stage cascade configuration at frequency of 2.4 -2.5 GHz. The transistor that used in this study has characteristic of high gain and low noise. The design is using microstrip line matching network with single stub technique to minimize parasitic effects. Transistor is using cascade configuration to produce high gain and improve the stability. The simulation results show that the LNA has reached all of expected specification at frequency of 2.45 GHz where S21, NF, S11, S22 are 30.693 dB, 1.248 dB, -70.358 dB and -72.982 dB, respectively; Also other values VSWR input, VSWR output, stability (K), input impedance and output impedance at 50Ω are 1.001, 1.0004, 5.280, 50.010 + j0.029 and 49.991 + j0.02, respectively. The measurement results show that at frequency of 2.45 GHz, LNA obtained value of S21, S11, S22, VSWR input, VSWR output are 22.17 dB, -4.117 dB, -13.049 dB, 4.297 and 1.572, respectively. Whereas, the best measurement of S21 is 24,05 dB at frequency of 2.05 GHz), S11 is -5.700 dB at frequency of 2.0 GHz, S22 is -27.570 dB at frequency of 2.045 GHz, VSWR input is 3.07 at frequency of 2,0 GHz and VSWR output is 1,09 at frequency of 2.045 GHz.
Design of substrate integrated waveguide to improve antenna performances for 5G mobile communication application
Authors: Sandi E , Diamah A , Iqbal M W , Fajriah D N
Published: December 2019

In this paper, a new design of substrate integrated waveguide was developed to improve the gain performance of microstrip antennas for 5G antenna applications. The antenna and substrate integrated waveguide ware designed at the frequency 28 GHz millimeter-wave band. The design of substrate integrated waveguide was developed by design an H-slot structure without a gap in the substrate layer to provide better matching impedance and reduce the loss of surface wave microstrip antenna. This study was conducted with a research and development approach through the calculation of the H-slot structure on substrate integrated waveguide and simulated by using antenna design software simulation. The numerical result shows that the new design approach for the H-slot structure without gap model was improved antenna gain and antenna size. This result has shown significant improvement compared to the circular antenna design without substrate integrated waveguide.
Feasibility study of installation photovoltaic system at a university in Indonesia: A case study
Authors: Umar H , Amudy M , Rizal T A
Published: December 2019

Universitas Samudra (UNSAM) is one of the new state universities in Indonesia, located in Langsa City, Aceh Province. The masterplan for developing UNSAM projected to expanding access to higher education for secondary school graduates in the province by increasing the capacity through the construction of new buildings. The plan to construct green buildings inside the campus complex is simply an effort to achieve the UNSAM mission, which is, to become a green campus. There are nine buildings on the UNSAM campus with a total roof area reaching 11,232 m2, which is structurally suitable for solar photovoltaic installation. In Langsa City, for one year, the average exposure to sunlight is equivalent to about 7,860 hours. The average annual insulation at this location is around 5.0 to 6.5 kWh / m2 / day. This study focuses on the economic feasibility of solar photovoltaic systems on the UNSAM campus. Electricity production costs, which might have economic benefits, are obtained for Rp. 1, 990 / kWh. The results of the analysis concluded that the economic potential of installing a PV system is very dependent on the geography of the building and the direction of PV installation.
Thermodynamic performance investigation of a diesel engine running on biodiesel derived from pangium edule and cocos nucifera
Authors: Rizal T A , Hamdani H , Thaib R , Khairil K , Husin H , Mahidin M
Published: December 2019

This study investigates the use of biodiesel derived from Pangium Edule Reinw (Pangium biodiesel) and Cocos Nucifera (palm biodiesel) in diesel engines as alternative fuels. A direct injection (DI) diesel engine simulated via a thermodynamic cycle model for investigation. Thermodynamic and performance parameters and compared for diesel, Pangium biodiesel, and palm biodiesel fuels at two different states. The results displayed that Pangium biodiesel shows a relatively higher cylinder temperature and pressure compared to palm biodiesel and diesel fuel at a lower crank angle. It also means that 100 % biodiesel is capable of performing a smaller engine capacity compared to diesel fuel at similar injection conditions. The brake power declines about 8.1% and 8.3% at 3800 rpm, while brake specific fuel consumption increases about 8.7% and 9.4% at 1900 rpm for Pangium biodiesel and palm biodiesel, respectively. The engine performance for Pangium biodiesel and palm biodiesel significantly improve at the same equivalence ratio condition. However, a more amount of fuel is required, which is approximately 20.7% for palm biodiesel and 8.5% for Pangium biodiesel. The brake thermal efficiency for Pangium biodiesel and palm biodiesel is generally better than diesel fuel.
Preliminary study of acidic hydrolysis in third generation bioethanol production using green algae
Authors: Yheni M , Theofany H C , Aditiya H B , Sepwin N S
Published: December 2019

In a mission to reduce the world’s dependency on non-renewable energy sources, through decades, researches are striving to find the best alternative energy substitutions. Considering the abundance availability of renewable sources, green algae are discovered as one promising candidate of future energy alternative. The aim of this research is to study the bioethanol production from green algae through acid hydrolysis. In this study, the acid hydrolysis was performed by utilizing hydrochloric acid (HCl) at concentration range of 0.5M-2.5M. Further, hydrolysis temperature was also varied at 50, 70 and 90°C. In this stage, a fixed hydrolysis period was set for 30 minutes. As acid pre-treatment is considered in this study as an effective way to convert carbohydrates into fermentable sugars, the sugars produced in this experiment would lead to an excellent grade of bioethanol produced. From the obtained result, green algae show a feasibly potential as the third-generation bioethanol feedstock. The highest theoretical ethanol value obtained by performing 2.5M of HCl at 90°C during retention time of 30 minutes.
A comparative investigation of biomass pyrolysis on connecting tube performance for liquid smoke production
Authors: Saputro H , Evan B , Liana D N , Karsa B S , Wijayanto D S , Bugis H
Published: December 2019

Currently, optimizations of biomass pyrolysis processes become an exciting topic. This is due to the increasing requirement of energy. This study focuses on the optimization pyrolysis process of solid waste of palm starch that became an environmental problem. The objectives of this study are to optimize the pyrolysis process of palm starch waste, especially liquid smoke product. The optimization of the liquid smoke product had conducted through the modification of connecting-tube between pyrolysis reactor and condenser. The connecting tube has differences in diameter, length, and material. The results of the study show variations in size and type of tube affect the product yield of the pyrolysis process. Stainless-steel pipes have better performance to produce liquid-smoke. The shorter the length of the pipe increases the quantity of liquid-smoke, but the smaller the diameter of the pipe decreases the quantity of liquid-smoke. This paper discusses in more detail the comparison of the performance of connecting tube by modifying the type of material, the length, and the diameter of the pipe.
Clay stabilizer and zetpass uses for improving sand control performance and resist the sand problem at field x based on laboratory study
Authors: Ruseno H S , Kasmungin S , Setiati R
Published: December 2019

This field X well production has indeed occurred in the sand and this well has been carried out with water flooding with injection water that is currently available. In this study of sand problems, it is intended to find out the cause of the problem of sandiness in terms of laboratory analysis of formation rock samples and injection fluid. Laboratory analysis consists of fluid characterization, rock characterization that is specifically assigned to rock minerals (SEM and XRD), and fluid injection compatibility tests with rocks, then a sand retention test is performed. After the addition of clay stabilizer in injection water, Zone A, Zone B and Zone C have increased apparent permeability to reach an interval of 500% -1000% mD. The use of Zetpass cannot be used in zone A because there is a lot of clay and the grain is very fine, but it can be used in zones B and C. Fluid interactions with rock minerals and chemical interactions will reduce the cementation of rocks so that they can trigger the occurrence of sand. Clay stabilizer is important to note in wells that have done water flooding. ZetPass solution is able to become sand control but has limitations. The ZetPas solution is able to become sand control but has limitations, where if it is applied to a reservoir that has a significant composition of clay minerals (smectite, illlite and chloride), the performance will decrease.
Readability of geothermal energy information in vocational textbooks
Authors: Wahyudi W , Pambudi N A , Biddinika M K , Ranto R , Rudiyanto B
Published: December 2019

The development of renewable energy in a country is influenced by public understanding by its people and this understanding is influenced by public literacy. To improve this, effort is needed to increase the level public literacy by improving readability. We study the readability of geothermal energy in vocational high school textbooks written in Indonesian. This is conducted because it is considered to have an effect on the low utilization ratio in the country. This readability research uses survey methods with population is student in vocational high school. Text material is read by the respondent and they are asked to give the impression whether the text is easy or difficult to understand. From this study, the factors that influence the ability to understand text information are displayed. The purpose of this study is to improve geothermal energy literacy, there for the application and development of this energy increase in the future.
The attitude of local government officers toward renewable energy in Indonesia
Authors: Pujaningrum I D , Pambudi N A , Biddinika M K , Saputro H
Published: December 2019

One of the causes of climate change is the use of fossil fuels. therefore, this triggers efforts to use renewable energy as a substitute fuel. According to REN21 data the development of renewable energy has declined from 2011-2016 along with the world’s energy needs. This issue is triggered, one of which is the policymaking of budget policies from several countries in the world, including in Indonesia. In this context, policy and government are the main components of implementing renewable energy. Therefore, the government’s attitude towards renewable energy plays an important role in the success of developing renewable energy. We conducted a survey to explore the attitude of the local government to the potential of renewable energy in Indonesia which has the potential to vary from each region. One area may have more renewable energy potential than the other. The results of this quantitative study are expected to help national policies on the development of renewable energy not only in Indonesia, but also in other countries where the diversity of opportunities spread throughout the region.
Work based learning in vocational education
Authors: Hafid D , Djohar A , Abdullah A G , Komaro M
Published: December 2019

This research conducted to analyse the application of work-based learning models that are being carried out in vocational school (SMK). The scope of this research relates to the framework used, weaknesses, strengths and characteristics of industrial involvement in the education process. This research was conducted by survey method, namely by directly observing the work-based learning process, with data obtained from the results of observations, interviews and literature studies from the program implementation manual. The object of his research is a school that carries out a work-based learning model in West Java, among others, Bandung Vocational High School with the name Toyota Technician Education Program (T-TEP) and ASTRA Motor Guidance, 2 Subang Vocational School with the name Teaching Factory program, and Lemah Abang Vocational High School under the name of the Yamaha Fostered Class Program. From the results of this research, it was found that the three schools that applied work-based learning models had their respective characteristics, and had their respective weaknesses and strengths, but from the three schools there was one similarity, namely using framework synchronization, namely the curriculum arranged based on synchronization between compulsory competencies in school with industry competencies.
Structure and magneticproperties of barium hexaferrite BaFe10CoNiO19 films
Authors: Sugihartono I , Rembulan I A , Rakhmawati D , Marpaung M A , Handoko E
Published: December 2019

We prepared Co-Ni doped BaFe10CoNiO19 films on the quartz glass substrates by ultrasonic spray pyrolysis with different molarities. The precursor was prepared by dissolving barium nitrate (Ba(NO3)2), iron nitrate (Fe(NO3)3.9H2O), cobalt nitrate (Co(NO3)2.6H2O), nickel sulfate (Ni2SO4.7H2O) in 50 mL of distilled water. Precursor solution was sprayed onto the cleaned quartz plates previously heated to 150 – 200°C, using a sprayer and argon as carrier gas. For crystallization the films were annealed in a furnace at a temperature 1000°C for3 hour in atmosphere ambient. By scanning electron microscopy (SEM), the barium hexaferrite BaFe10CoNiO19 films shows agglomeration and the average diameter of particles less than1 μm. We believed, the structure of barium hexaferrite BaFe10CoNiO19 films change due to Co-Ni existence. Therefore, the magnetic properties deteriorate by incorporation of Co-Ni into the structure of barium hexaferrite BaFe10CoNiO19.
Scaffolding in conceptual science
Authors: Isrokatun I , Anggita D , Purwono B S , Sunaengsih C , Syahid A A
Published: December 2019

Scaffolding is a technique developed to improve learning activity. The technique was designed to help students noticing their goals and to provide support for the students’ needs. It is important to realize that each student has their own development tempo or Zone Proximal Development (ZPD). Therefore, every teacher is required to be able to provide teaching in accordance with each student’s ZPD. This individual difference will affect student’s method of learning and its result. In this case, this study employed a descriptive-qualitative method in order to describe the implementation of scaffolding in Situation-Based Learning (SBL). The respondents of this study were the fifth-grade elementary school students (10-12 years old) who studied the concept of Force. It was found that scaffolding technique that was optimally provided by teacher could improve students learning activity in understanding the concept. To conclude, it was revealed that learning activity using scaffolding could improve students’ learning result.
REACT digital and manual worksheet for enhancing physics problem solving skill
Authors: Suhendi H Y , Jamilah N , Mulhayatiah D , Ardiansyah R
Published: December 2019

This study aims to find out the comparison of students’ problem-solving abilities in harmonic vibration material between students who use REACT- digital and manual worksheets. The method used is quasi-experiment with the research sample taken from two classes totalling 60 students of Islamic schools. The results showed that there were no differences in problem-solving abilities between students who learned using REACT-digital and worksheets and those using REACT- manual worksheets, this happens because during the learning process the teacher uses the same supporting tools, namely student worksheet based on REACT. The implication of this study is problem solving ability can be obtained by learning using REACT digital and manual worksheets.
Effects of variations in the addition of SiCp filler to corrosion rate of metal matrix composites (MMCs) Al-Cu-Mg/SiCp
Authors: Susila A B , Handoko E , Fahdiran R
Published: December 2019

We study of effecs Al-Cu-Mg/SiCp Metal Matrix Composites (MMCs) with a matrix composition of 4.4 wt% Cu, 1.8 wt% Mg with SiCp fillers were varied (3.4; 3.7 and 4.0) wt% and the remaining Al. SiCp is mixed into Al-Cu-Mg heated at 900oC, then stir casting is carried out at 250 rpm for 10 minutes. Then cooling is carried out to room temperature. After cold, heat treatment is given and continued testing. The SEM-EDX and XRD test results showed that the increasing SiCp content, the tendency for SiCp and Mg bonds to form the Mg2Si phase increased, making the sample items enlarge and appear coarser. While the corrosion rate test of increasing SiCp in the Al-Cu-Mg matrix makes Al-Cu-Mg/SiCp samples tend to be more corrosion resistant. The event of declining corrosive properties is due to SiCp particles occupying grain boundary areas replacing O2 (which provides corrosive properties) that are trapped in the sample during the cooling process.
Physics in geothermal power plants
Authors: Nasrudin D , Nopilawati D , Rochman C , Rahayu Y N , Millah M F , Mulhayatiah D
Published: December 2019

Many students dont like physics because they feel far away from physics. Therefore physics must be made closer to students through contextual physics. This paper wants to describe the physical concepts that exist in geothermal power plants. The method used is Research and Development (R & D) with the ADDIE model design. The results of the study show that there are many physics concepts that can be taught to students through observation and analysis of geothermal power plants such as the concepts of temperature, heat and displacement, electricity, energy and others. These physics concepts can be packaged in physics learning through the development of enrichment materials. It is hoped that there will be an increase in the mastery of concepts and literacy of students towards the surrounding natural resources.
The Simulation of one-time-pad quantum key distribution
Authors: Delina M , Iswanto B H , Permana H , Muhasyah S
Published: December 2019

The quantum key distribution provides a secure information exchange. The system employed a single photon as the messenger. In this study one-time pad (OTP) quantum key distribution provide a key which is use securely. For example, in a war. Therefore, it is not possible to share the secrete key in this condition, but the OTP can be generated several times as long as there is no eavesdropped detected. This paper discusses the simulation of a one-time pad quantum key distribution with event-by-event method.
Heat energy conversion on applied technology of geothermal energy direct utilization
Authors: Sumotarto U , Hendrasto F , Anugrahadi A
Published: December 2019

Indonesia has a high geothermal energy resource, preserved in many fields. But not all geothermal fields are potential for indirect utilizations such as for electric power generation. A direct utilization of a low potential geothermal energy resource has been performed at Batukuwung geothermal field, Serang, West Java. A simple design of vegetable grain dryer has been created and constructed using galvanized metal pipes. A reduction of temperature from 63,1 degrees Celsius at the heat source to 41,5 degrees Celsius at the dryer tool through galvanized metal pipes is quite adequate for vegetable grain drying purposes. It is quite a prospect simple technology to be applied and developed in Indonesia as a geothermal energy country having various vegetable grain products from various plants such as coffee, corn, peanut and many other tropical plantations.
Study on mechanical properties of Metal Matrix Composites (MMCs) Al-Cu-Mg/SiCp with Powder Metallurgy
Authors: Susila A B , Sugihartono I , Marpaung M A
Published: December 2019

The synthesis of aluminum (Al) alloys, Al-Cu-Mg from mixture powder 88.4 wt% Al; 3.8 wt% Cu and 1.8 wt% Mg the adding 6.0 wt% up to 7.0 wt% of SiCp on Al-Cu-Mg. After mixing the sample has been prepared by hot pressing process at a temperature of 350oC. After pressing sample has prepared by sintering one hour at a temperature 500oC and aging 16 hours. Al-Cu-Mg/SiCp alloys samples has been investigated. The structure analysis were examined by X-Ray Diffractometer (XRD) and scanning electron microscope (SEM-EDX). The hardness was measured by hardness Vickers method. According to the results, it can be assumed that the 7 wt% of SiCp content is prefer content to get better quality of hardness Vickers of Al-Cu-Mg alloys.
Utilization of water hyacinth-based biomass as a potential heterogeneous catalyst for biodiesel production
Authors: Yani F T , Ulhaqi R , Pratiwi W P , Pontas K , Husin H
Published: December 2019

With the aim to reduce the negative impacts caused by the widespread of water hyacinth to the environment, this paper reports the utilization of water hyacinth as a source of biomass to fabricate a heterogeneous catalyst. The catalyst was prepared by calcinating the grounded hyacinth biomass at 600°C, and K2CO3 was then introduced as a co-catalyst through impregnation method. The properties of biodiesel were also evaluated in terms of yield and density. To better understand the impregnation effects, surface topography, particle size, and atom composition of water hyacinth catalyst with K2CO3 impregnation were analysed. The performance of the synthesized catalyst was studied for the transesterification reaction of palm oil into biodiesel. The reaction was carried out in a batch mode for 3 hours with stirring at 65°C. The molar ratio of methanol to the oil of 12:1, and the catalyst loading was 15 wt. %. The highest yield (97.57%) was obtained from the process using 15% of the hyacinth-based catalyst which impregnated with 10% of K2CO3. The biodiesel produced was in the range of the SNI standard. The water hyacinth can be a promising heterogeneous catalyst for biodiesel production at an industrial scale.
Studies on degradation of rice husk ash filled in polypropylene composite films under natural weathering condition
Authors: Aprilia S , Syamsuddin Y , Razali N , Fitriani F , Amin A , Guswara F Y , Ihsan F
Published: December 2019

Natural weathering of rice husk ash filled in polypropylene composite films has been investigated by exposing the samples to a tropical clime for 4 months with max-min temperature 22 - 30°C and relative humidity 75%. In this study, the film composites filled with rice husk ash for decay to get the composites that has good mechanical performance after exposure in natural weathering. Rise husk ash filled in film composite polypropylene effect of filler loading was 1, 2, 3, 4 and 5% and compare with neat composite. The silica from rice husk ash was isolated with acetic acid. The weathered film composites polypropylene was investigated before and after exposure and analysed the morphology with FTIR and SEM. Mechanical test for the film composites polypropylene take place for tensile strength and percentages of elongation at break. The result show that the tensile strength and percentages of elongation at break decrease after natural weathering. The average tensile strength of film composites polypropylene decrease about 64.54 ± 17.50% and the elongation at break of film composites polypropylene decrease about 49.33 ± 15.28%. The morphology of film composites change structure of chemical and fracture surface after natural weathering.
Nano-bentonite as a low-cost adsorbent for removal of mercury from aqueous solution
Authors: Zaki M , Maulana A , Tirtayani F , Alam P N , Husin H
Published: December 2019

Study of the adoptive of mercury removal (Hg II) from aqueous solution was investigated by low-cost nanoparticle bentonite. Nanoparticle bentonite was prepared by the heating method at a temperature of 400 °C. The activation was carried out by immersed of natural bentonite in sodium hydroxide. The resulting powder was heating in the present of nitrogen gas as an activator agent. The bentonite sample was characterized by means of Scanning Electron Microscopy (SEM) and Brunai Emmet Teller (BET). The prepared bentonite had a heterogeneous surface with a particle size of 100-300 nm. The nano-bentonite was then tested in the absorption of Hg2+ synthetic were varied of the initial concentration (Co) from 5 to 400 ppm with 0.2 gram absorbent and 100 ml solution. The Hg2+ absorption amount was analysed using Atomic Absorption Spectroscopy (AAS). The adsorption capacities were fully fit with Freundlich isotherm models. It was found that the adsorption process followed the Freundlich isotherm model with n value of 1.9577 and Kf of 8.3985. Therefore, using the low-cost nano-bentonite is a potential adsorbent for removal of mercury from water solution.
Predicting oil recovery through CO2 flooding simulation using methods of continuous and water alternating gas
Authors: Fathaddin M T , Thomas M M , Pasarai U
Published: December 2019

In this study, CO2 Flooding simulation models were used to predict oil recovery. The models were previously validated by laboratory experiments of continuous injection and water Alternating Gas (CO2) injection for miscible condition. Sensitivity test was performed to attain the effect of injection rate parameters. The simulation experiments indicated that the optimal performance for both methods obtained at injection rate of 0.09 cuft/day. The scenarios of continuous CO2 injection showed that the maximum recovery factor was 21.1%. While the maximum recovery factor of the scenarios of water alternating gas was 37.9%. Based on the results of the whole scenarios used, Walter Alternating Gas flooding resulted in more effective recovery factor than Continuous CO2 Flooding, within the range of injection rate studied.
The use of Trichoderma harzianum and Aspergillus niger in Indigofera zollingeriana fermentation
Authors: Puspitasari M , Hadist I , Rohayati T , Royani M
Published: December 2019

Indigofera zollingerianais a feed that has high crude fiber content so it is difficult to use for poultry feed. The fermentation process using fungus is expected to overcome this problem. The study aimed to determine the interaction between dose and fungi kinds, with the length of fermentation on the protein and crude fiber content ofI. zollingeriana. Another goal is to determine the optimum conditions for fermentingI. zollingeriana. The method used a Completely Randomized Design (CRD) factorial pattern. The first factor consisted of 6 levels of the different fungi dosages, namely 0.1%, 0.2% and 0.3%Trichoderma harzianum; 0.1%, 0.2% and 0.3%Aspergillus niger. The second factor was four levels of the duration of fermentation: 24 hours, 48 hours, 72 hours and 96 hours. All treatments were repeated twice. The experimental data were tested by F test, then Duncan’s analysis was carried out. The results showed that there was an interaction between dose and fungi kinds with the length of fermentation. The optimal condition for fermentingI. zollingerianawithT. harzianumfungus was at a dose of 0.3% and 96 hours fermentation time. This treatment gave the increasing of protein content and reducing crude fiber content.
Phytochemical screening and proximate analysis of soybeans (Glycine max) variety Gamasugen 1 and Gamasugen 2 derived from gamma rays irradiation
Authors: Lisanti E , Arwin A
Published: December 2019

Soybean is very widely used in Indonesia, especially as a raw material for processed foods such as tofu and tempeh. This study aims to analyze the phytochemical content and proximate of variety irradiation soybean seeds Gamasugen 1 and Gamasugen 2. Phytochemical and proximate analysis of the seeds of soybean were carried out with quantitative and qualitative analysis. The proximate study analyzed included water content (oven method), ash content (furnace method), fat content (Soxhlet method), and crude fiber content (acid alkali digestion method). The results of phytochemical testing show that both soybeans (Gamasugen 1 and Gamasugen 2) contain flavonoid as quercetin, alkaloid, saponins, phenolic, triterpenoid, and glycoside. The proximate analysis results showed that Gamasugen 1 soybeans had a moisture content of 8.22%, lower than Gamasugen 2, which was 11.67%. Gamasugen 1 soybean content is 4.61%, lower than Gamasugen 2, which is 4.86%. Gamasugen 1 soybeans have a fat content of 14.50%, more economical than Gamasugen 2, which is 15.51%. Gamasugen 1 soybeans have a fiber content of 14.56%, higher than Gamasugen 2 soybeans, which is 9.96%. The conclusion shows the most top proximate analysis of soybean is found in fat content (Gamasugen 2) which is 15.51% and the lowest level is found in ash content (Gamasugen 1) which is 4.61%.
Baggasse charcoal optimization based on different concentration and immersing time to stabilize quality of cooking oil
Authors: Rahayu S , Pujiono F , Dewi M , Prasetiyo A
Published: December 2019

Sugar cane is a raw material for making sugar which can only be grown in tropical regions. Sugarcane bagasse generally consist of cellulose sugar groups such as hemicellulose, lignocellulose, and lignin. Other than that it contains hydroxyl groups to absorb colours and free fatty acids. The purpose of this study was to measure baggasse charcoal optimation based on different concentration and immersing time to stabilize cooking oil quality. CRD (Complete Randomized Design) was applied with 3x3 factors. Baggasse charcoal was activated using KMnO4 1N for 2 days. Variation of baggasse charcoal concentration are (5%, 10%, 15%) and variation time to optimation for 4, 5, and 6 days. The result showed that bagasse charcoal can affect the turbidity, smell, and colour from cooking oil that has been used repeatedly. The most effective concentration and immersing time is from sample 5% on 6 day. It can be concluded that re-used cooking oil applied with bagasse charcoal was clearer that those didn’t. The organoleptic assay also showed better profile on cooking oil.