bluuebunny/crossref_metadata_2025 huggingface dataset:
Teacher’s Candidate Readiness and Beliefs in teaching STEM: Formulating Best Strategy in Scientific Communication
Authors: Probosari Riezky Maya , Utami Budi , Widyastuti Fatma
Published: March 2021

The application of Science, Technology, Engineering, and Mathematics (STEM) in science learning can facilitate communication interactions between teachers and their students while also encouraging classroom management teachers. However, not all teachers can apply essential principles in using STEM. This research aimed to get information about teachers’ readiness and confidence in preparing, teaching, and evaluating the application of STEM. We also gain some information about the difficulties and difficulties of teachers in using STEM. Data collected through a survey by distributing questionnaires to 50 teachers randomly. Data were descriptively analyzed. The results show that some teachers have not been able to integrate several science fields in an integrated manner and how to evaluate them. This finding is expected to be a recommendation for research into STEM implementation in learning.
Development of instructional materials based on mobile learning media (MLM) and its benefits
Authors: Irmawan Sandri , Suharno  , Saputro Herman
Published: March 2021

This study aims to develop a learning model based on Mobile Learning Media (MLM), test its effectiveness, and describe its benefits. MLM was developed for Computer Numerical Control (CNC) programming courses in vocational high schools. The effectiveness is tested by indicators of students’ higher-order thinking skills (HOTS). Advantages are explored based on their performance in learning. Recently, CNC programming lesson is known as a difficult subject because it requires critical and creative thinking skills. The research design was experimental with a pretest-posttest random control group pattern. Research respondents totaled 120 students with 60 students in the experimental class and 60 students in the control class. The research data includes data on the effectiveness of the model and student learning outcomes. Analysis of research data used descriptive statistical techniques and independent sample T-test with the help of SPSS 2.0 software. The results showed that the use of MLM was effective to improve teacher performance in teaching. MLM can facilitate students to develop HOTS. This is proved by the increase in student learning outcomes after the application of MLM. Based on the analysis of answers accompanied by reasons, students are able to show significant improvement in all critical and creative thinking processes.
Effectiveness of Waste Enviropreneur Learning Tools on Critical Thinking Skills
Authors: Putri Dini Resita , Sueb
Published: March 2021

Empowering skills students to help prepare themselves for the defiance 21st century. One of the skills needed is critical thinking. The ability to think critically can be honed by applying waste environmental learning tools. This study aims to determine the effectiveness of the waste environment learning tools on students’ critical thinking skills. The study used a semi-experimental study with a pretest-posttest nonrandomized control group design. Data collection occurs before and after online learning activities using questions and rubrics. The research subjects were two tenth classes of Biology. Data analysis used Ancova showed that α <(α = 0.05). Based on data analysis, there are differences in students’ critical thinking skills with learning to use and not to use waste environment learning tools.
The relationship between critical thinking skills and students learning motivation with students’learning achievement about buffer solution in eleventh grade science program
Authors: Nur’azizah Rizqiyah , Utami Budi , Hastuti Budi
Published: March 2021

This research was aimed to find out: (1) the relationship between students’ critical thinking skills with students’ achievement; (2) the relationship between students’ learning motivation with students’ achievement; and (3) the relationship between students’ critical thinking skills and learning motivation with learning achievement in learning about buffer solution. This was a quantitative research with a correlational approach. The populations were 178 students at eleventh grade science program from SMA Negeri 6 (senior high school) in Surakarta, Central Java, Indonesia, academic year of 2019/2020.. One class with 36 students was selected sample by using cluster random sampling. The data were obtained through a multiple-choice test about critical thinking skills, a multiple-choice test about the buffer solution topic, and a questionnaire about students’ learning motivation. The data were analyzed by using Pearson Product Moment correlation, multiple correlations, and multiple regression analysis. The results showed that: (1) A positive and significant relationship between students’ critical thinking skills with students’ achievement was found, as shown by the correlation coefficient value of 0.871; (2) A positive and significant relationship between students’ learning motivation with their achievement was found, as shown by the correlation coefficient value of 0.884; and (3) A positive relationship between students’ critical thinking skills and learning motivation with their learning achievement, as shown by correlation coefficient value of 0.931. Regression analysis obtained the equation of Y = 10,416 + 0.423 X1+ 0.487 X2, and the value of coefficient determination was 0.845 or 84.5%.
Correlation Between Thinking Ability and Cognitive Learning Outcomes of 7th-grade Students at SMPN 2 Surakarta
Authors: Pratiwi Shafina Ade , Sunarno Widha , Probosari Riezky Maya
Published: March 2021

Thinking ability is a basic thing that every student has. Concrete and Abstract thinking abilities are part of the cognitive development stage. This study aimed to identify the correlation between concrete and abstract thinking abilities with cognitive learning outcomes. This study design was a non-experimental correlation in quantitative research. All 7th-grade students of SMPN 2 Surakarta in the 2019/2020 academic year were used as subject in this study. One sample class was selected using Cluster Random Sampling. Data on thinking ability and cognitive learning outcomes were collected using an online test method via a google form. The analysis techniques were correlation product moment on SPSS and scalogram on Rasch Model Analysis. This study found that there is a positive correlation between concrete and abstract thinking abilities with cognitive learning outcomes, students who dominate the abstract thinking abilities have better learning outcomes than the student who dominates the concrete thinking abilities.
Spatial analysis of return period based copula on extreme rainfall data in South Sulawesi
Authors: Yanti Reski Wahyu , Fitrianto Anwar , Aidi Muhammad Nur
Published: March 2021

The extreme rainfall in an area makes the area vulnerable to various disasters. To reduce the risk of damage caused by floods, it is important to know the characteristics of extreme rainfall. Generally, the characteristics of extreme rainfall are described by one variable. However, most of the extreme rainfall events also need to be explained based on the return period they occur using several variables with copula approach. This study model to the characteristics of extreme rainfall with two variables, they are namely extreme rainfall intensity and extreme rainfall volume. The purpose of this study was to analyze the spatial distribution pattern of the return period from extreme rainfall in South Sulawesi. To determine the characteristics of the return period distribution in South Sulawesi, spatial analysis is carried out using the Moran’s index and the LISA index. The results of the spatial autocorrelation analysis with the Moran’s index show that there is a relationship between several return period values in South Sulawesi, with the Moran’s index value of 0.209. This means that the value of the return period in South Sulawesi has a clustered relationship pattern. Furthermore, the results of the spatial autocorrelation analysis with LISA show that there are seven sub-districts identified as having local spatial autocorrelation. The conclusion obtained from Moran’s scatterplot is that 15 sub-districts are the main concern in preventing natural disasters because extreme rainfall in these 15 sub-districts tends to occur more frequently, so that it can lead to various natural disasters.
Fast forwad Adiabatic Quantum Dynamics On Two Dimensional Dirac Equation
Authors: Setiawan I , Sugihakim R , Gunara B E
Published: March 2021

We study a scheme of accelerated adiabatic quantum dynamics. This scheme was originally proposed by Masuda-Nakamura. The strategy of combining two opposite idea: infinitely-large timemagnification factor and infinitely-small growth rate of adiabatic parameter was elucidated. We apply the proposed method to two dimensional system with electric field and magnetic field using two dimensional Dirac equation. We settle the quasi-adiabatic dynamics (QAD) by adding the regularization terms to the original vector potential and scalar potential and accelerate it with use of a large time-scaling factor which realizes QAD on shortened time scale. These terms multiplied by the velocity function give the counterdiabatic terms that generate the fast forward potential. The fast forward potential can accelerate the dynamics of the system from iniitial state to the final state with the same condition.
Science Batik Ciwaringin: The Implementation of Ethno-STEM PjBL Model in learning Biotechnology at PGSD Students
Authors: Tresnawati N , Saleh I , Sudarmin  , Wardani S
Published: March 2021

Indonesian batik has been awarded by UNESCO as one of the world’s non-object cultural heritages. And this is a challenge for young generation on how to preserve this culture. The purpose of this research is to implement Biotechnology learning through the Ethno-STEM PJBL model for PGSD students and produce sains batik, so it can triggger the young generation to preserve it. This learning model is a project based learning in analyzing several natural materials as natural dyes for batik, dye-making techniques that are integrated into the concept of biotechnology, and producing a product designed by the students. This research method is R&D research. It has 3 steps: (1) Define; (2) Design Development; and (3) Disseminate. The instruments used in this research are product validation sheets, assessment rubric products on the designs, colors, and symbolic value. Data were analyzed descriptive qualitative and descriptive statistics. The finding of the research showed that the products of sains batik validatated, one of which is “piperidine seribu daun” has a a secondary metabolite content of the mango combined with the design of thousand of leaves, the special Ciwaringin batik. It has a meaning of togetherness to preserve the environment for manga as local plant of Cirebon. The conclusion from this research is that students not only learn the concept of biotechnology but also they can develop Ciwaringin batik. The implication of this research is that it can stimulate the young generation to take a part in preserving and developing the Indonesian batik industry.
Profile of Argumentation Skills using Toulmin’s Argumentation Pattern (TAP) in Senior High School Students in Biology Learning: Preliminary Research
Authors: Anita  , Afandi  , Tenriawaru A B , Putra D A
Published: March 2021

The skills needed in the 21st century, including critical thinking, communication, collaboration, and creativity, can be developed through argumentation skills. The method used is descriptive quantitative, with a sample size of 102 students. Student argument analysis refers to Toulmin’s Argumentation Pattern (TAP), which contains aspects of claim, grounds, warrant, backing, and rebuttal. This study aims to describe the profile of the students’ argumentation skills of class XII science at Senior High School 1 Sungai Pinyuh on the structure and function of cells in the reproductive system. The results showed that the students’ argumentation skills had a percentage of 64.8% with enough category. The percentage of each aspect, namely the claim was in excellent category (95.25%), grounds was in enough category (59.25%), warrant was in good category (70.5%), backing was in enough category (56%), and rebuttal was in less category (42.75%). This study also showed the percentage level of student argumentation, namely the percentage of students categorized as level 1 at 1.96%, level 2 at 29.41%, level 3 at 68.63%, level 4 at 0%, and level 5 at 0%. The students’ argumentation skills categorized as enough and were at levels 1, 2, and 3. Empowering through appropriate learning models and strategies.
Prospective Chemistry Teacher’s Pedagogical Content Knowledge in Chemical Application Planning
Authors: Shofwa A , Endang S , Budi H , Sri Y
Published: March 2021

This research aimed to analyze the ability of PCK (Pedagogical Content Knowledge) students of prospective chemistry teachers FKIP UNS. The research method was qualitative descriptive. The study samples were all prospective chemistry teachers of FKIP UNS who took the course of Chemical Application Planning (PPK). Data was collected from the observation of student PCK competencies, including the ability to design learning, ability in material mastery, and general PCK skills of prospective chemistry teachers from Content Representation. This research instrument was an observation sheet of PCK and CoRe competency students’ prospective chemistry teachers. The percentage of students’ prospective chemistry teachers of FKIP UNS to plan learning was 75.38% for grade A and 74.34% for grade B, while for content mastery was 77.19% for class A 74.79% for grade B, where the results were included in the category enough. The results of content representation by prospective chemistry teachers in high school chemistry were also quite sufficient.
The Application of Thematic-Scientific Learning In Elementary Schools By Distance Learning To Build Higher Order Thinking Skills
Authors: Nugrahaningsih Theresia Kriswianti , Almasitoh Ummu Hanny , Darmo M.Pujo , Riyadi Iswan
Published: March 2021

In entering the era of the industrial revolution 4.0 which is also known as the phenomenon of disruptive innovation, a learning process is needed that leads to the formation of high-order thinking skills (HOTS). Elementary school is the earliest formal education to provide a foundation for the next education. For this reason, HOTS-based learning is also needed in elementary schools. Following the demands of the refined 2013 curriculum, learning is given in a thematic form. This study is combining thematic learning with scientific learning to build higher-order thinking skills. Because currently it is still in a pandemic period, so the learning is carried out by distance learning. To support the learning, the communicative learning media are made that can be accessed by zoom meeting and lead to higher-order thinking. The media is made using power points, which be arranged according to sub-themes, that have been determined according to the curriculum based on the stages of scientific learning by paying attention to higher-order thinking processes. Also, an evaluation tool that leads to higher-order thinking is developed. From the trial results, scientific thematic learning can be carried out online with the help of power point media, with the result that more than 70% of students get a score of more than 70. By using the mean difference test, it is evident that there is a significant increase in the average value between pretest and posttest for 4 (four) subjects.The limitation of this learning is that not all students can actively participate in online discussions.
Torrance Creative Thinking Profile of Senior High School Students in Biology Learning: Preliminary Research
Authors: Aryanti Y , Afandi  , Wahyuni E S , Putra D A
Published: March 2021

One of the skills developed in the 21st century is creative thinking skills. Creative thinking is a thought process that produces a wide variety of possible ideas and various solutions. The theme of environmental change and waste recycling is one of the learning themes closely related to everyday life. This study aims to analyze students’ creative thinking skills in biology subjects with environmental change and waste recycling. This research is descriptive quantitative research. The subjects of this study were 32 students of class X science Muhammadiyah 1 Pontianak. The technique of collecting data wasa test of creative thinking skills in the form of description questions. The questions used were based on indicators from Torrance (1969). The percentage of each indicators, namely fluency was in the medium category (55.5%), flexibility was in the medium category (52.3%), originality was in the medium category (50.8%), and elaboration was in the low category (32.9%). The average of all indicators was 48%. Based on findings, it can be concluded the ability to think creatively is still low. Further research requires a learning model to improve creative thinking skills such as the Creative Problem Solving (CPS) or Project Based Learning (PjBL) model.
Indonesian Teacher’s Competencies Profile According to The SAMR Model Framework
Authors: Priyadi Mintoro , Sarwa  , Lisyanto  , Basuki Nur
Published: March 2021

The purpose of this research was to take inventory of teachers’ experiences and practices in online learning services during Covid-19 were aligned with the SAMR model (substitution, augmentation, modification, and redefinition) as a framework for the formulation of 21st Century Teacher competencies. Formulation of 21st-century teacher competency profiles is specifically developed based on competency standards for Indonesian Teachers, online learning practice experiences during Covid-19, and synergized with the SAMR framework. The 21st-century Indonesian teachers profile conceptually validated through the FGD technique (focus group discussion). The formulation of the specific competence of 21st-century Indonesian teachers refers to the SAMR framework is formulated successively in stages: 1) substitution; 2) augmentation; 3) modification; and 4) redefinition. Specific professional competences in developing content: 1) packaging and serving; 2) enrich; 3) adapting, and 4) creating. Specific pedagogical competencies in packaging and serving content: 1) offline; 2) online; 3) offline simulation; and 4) online simulations. Teacher position-specific social competencies: 1) instructor; 2) facilitator; 3) motivator; and 4) inspiration. Personality specific competencies in classroom communication: 1) passive; 2) active; 3) adaptive; and 4) interactive.
Simulation for Absorption of Acid Gas into Piperazine Promoted Methyl Diethanolamine Solution Using Sieve Tray Column
Authors: Nisa NIF , Mahfud M , Altway A , Nurkhamidah S , Eduard W , Bethiana TN
Published: March 2021

The removal of CO2 and H2S gas is a crucial process in the sweetening of natural gas. One of the processes for taking these gases is reactive absorption using piperazine (PZ) promoted methyl diethanolamine (MDEA) solution. The absorption process is carried out in the sieve tray column to avoid liquids distribution problems in large diameter columns. No research discusses the acid gas absorption process simulation in the MDEA-PZ system using a sieve tray column. Therefore, this research simulates the acid gas absorption process in the MDEA-PZ system using a sieve tray column with a rate based modeling approach. The development of the rate-based model is based on the Film model’s theory. The effect of the reaction on the mass transfer coefficient is expressed by the enhancement factor. The diffusion interaction of the components in the mixture is expressed by the Stefan-Maxwell equation. The research’s main objective is to observe the effect of lean amine temperature and absorber pressure on the percentage removal of CO2 and H2S. The simulation prediction results showed the highest percentage of CO2 and H2S removal when the lean amine temperature was 60°C and the absorber pressure was 35 atm.
Monitoring System of Motor Vehicle Feasibility Test Using Arduino Based on Internet of Things
Authors: Yudha R G P , Echsony M E , Sukamto  , Hakim A E , Setyawan S B , Putra R G , Subkhan M F
Published: March 2021

Air pollution caused by exhaust emission of motor vehicles especially the two wheels contain a wide range of harmful gases that can cause disease. Therefore, emission tests are indispensable in controlling the emissions of gas that are loose into the air. However, not many people know the importance of emission testing. In addition to the emission results can not store periodic data, the available emission test devices are also very limited. Therefore, the author proposes the feasibility “Test Monitoring system for motorised vehicles with Arduino-based Internet of Things”. In data retrieval use a simple linear regression method. In this tool the x-axis is the ADC value of the sensor while the y-axis is the value of gas levels. The greater the ADC value, the greater the PPM value is generated. Emission test data storage using the Internet of Things method. The Data that has been saved can be viewed through websites and Android apps. After several tests, there were 3.05% error percentage for HC gas and 3.91% for CO gas and data could be stored in the database. Overall this tool is worthy of use to measure the exhaust emissions of motorised vehicles.
Decision Support System Simulation Application with MFEP Method
Authors: Tarifu La , Equatora Muhammad Ali , Romindo  , Abdullah Dahlan , Herianto  , Saragih Yasmirah Mandasari
Published: March 2021

Public hospitals are places where people can get medical services. Each hospital has doctors. Every doctor who practices in a public hospital has his field. This study limits the doctor in question to be a general practitioner. A general practitioner is a doctor who will analyze and treat common diseases. Determining the best doctor to place in a hospital is not easy. The Multi-Factor Evaluation Process method is an excellent method to determine the best doctor. This method works by comparing the weights of each criterion that the doctor has. The results obtained can be used as a reference in placing the doctor in a public hospital.
Decision Support System using WP Algorithm for Teacher Selection
Authors: Tohir Ahmad , Hery Winoto Tj , Tecoalu Melitina , Bauto La Ode Monto , Nadeak Bernadetha , Hutauruk Ahmad Fakhri , Wicaksono Galih , Mohzana  , Achmad Daengs GS , Sutopo  , Sembiring Tamaulina br
Published: March 2021

Education is the most important thing done by every country. Going to higher education cannot be done briefly. There are several stages in implementing this education. One of them is Junior High School (SMP) education. This research took place in one school. This education requires teachers who are professional and have good performance. The decision support system with the Weighted Product (WP) method can be used to help select teachers who can join the school. The Weighted Product method works by calculating five criteria as the basis for selecting and seeking teachers. The results of this method are the teacher ranking scores from highest to lowest. The benefits obtained; the school can make acceptance based on the system implemented.
Seismic Evaluation of Existing Building Structures in the City of Madiun using Pushover Analysis
Authors: Wibowo Rendi Gusta , Rohman Rosyid Kholilur , Cahyono Setiyo Daru
Published: March 2021

This paper presented the seismic evaluation of the existing building structure in Madiun city. The selected building analysis is Parkir Building of Pasar Besar Madiun city that located at Panglima Sudirman street Madiun city Indonesia. The structural system of this building is Moment Resisting Frame (MRF). The building structure is reinforced concrete. Seismic load calculation use equivalent static load analysis base on Seismic Resistance Design Standart for Building Structures (SNI 1726:2012). Pushover analysis of this building use software ETABS version 9.00. Aim of this research to know the performance level of this bulding. The pushover analysis is a relatively simple tool for Performance Based Seismic Evaluation (PBSE).
Microstrip Antenna Design with Patch Rectanguler for Primary Surveillance Radar (PSR) L-Band Application
Authors: Prabowo A S , Pambudiyatno N , Harianto B.B
Published: March 2021

This research aims to design an inexpensive primary surveillance radar (PSR) antenna with high efficiency and works on the L-Band frequency by using a microstrip antenna, this antenna has advantages in terms of ease of design, light weight and low production prices. The design of the antenna design is made in a simulation that works at a frequency of 1.3 GHz, the substrate material is made of Fr-4 which has a dielectric constant value (er) of 4.3, while the patch material is made of copper. The antenna has a patch size of 71 x 54 mm array 2x1, while the size of the ground plane is 222 x 124.8 mm. Antenna performance testing is done by looking at S-Parameter simulation and voltage standing wave ratio (VSWR). To get an accurate value at a frequency of 1.3 GHz, the sweep method is applied to the patch by changing the width and length of the patch. From the simulation results we get the S-Parameter value right at the frequency of 1.3 GHz with a return loss value of -35 dB while the value of VSWR of 1.29 indicates the antenna has a high efficiency. This research aims to create an antenna innovation that is based on inexpensive and has high efficiency.
Design and Simulation of Airfield Lighting System Using 8 Luminaire in Airfield Lighting Laboratory at Politeknik Penerbangan Surabaya
Authors: Sudjoko R I , Hartono  , Hariyadi S , Suwito
Published: March 2021

Airfield lighting system (ALS) provides visual reference to aircrafts during airport operation. In ALS equipment, constant current regulator (CCR) feed a luminaire circuit supplied through isolation transformer. Luminaire circuits are a large number of lamps which organized in serial circuit and connected to CCR that supply energy to the lamps. Modeling the component is needed to simulate ALS including of constant current regulator, underground cables, isolation transformer, and lamps. This simulation is usefull to study ALS behaviour and predict their response to electrical systems and future technological changes. This paper present circuit design and simulation of ALS using power simulator (Psim) software. The simulation results are observed in maximum brightness condition of the CCR. The CCR measurement results for this condition are 6.63 Ampere current output and 5kV voltage output. It has been observed that the designed system has been succesfully implemented to airfield lighting system circuit according to the component specification.
The Performance Characteristics of Electric Motors with Variation of Load In Application in Two-Wheeled Vehicles
Authors: Salim A T A , Yuwono I , Pribadi W , Romandoni N , Yuwana L , Rosallino R , Putri S A , Alqoriah T M
Published: March 2021

Electrical vehicle is a vehicle that uses one or more electric motors or traction motors as its driving force. Electric vehicles first appeared in the mid-19th century, when electricity was chosen as the propulsion in vehicles. At that time, electric vehicles offered greater comfort and easier operation than gasoline-powered cars. However, since the advancement of the internal combustion engine, the existence of this technology has been less competitive. The decline in the use of vehicles with electric power at that time was due to the quite expensive price, but on the other hand EV has the advantage of a very good level of environmental friendliness, because there is no exhaust gas coming out of the engine. To get a power source, EV uses electrical energy stored in the battery, because it is necessary to charge the battery embedded in the vehicle before using it. Without realizing it, the use of motorbikes has negative things including incomplete combustion results, resulting in air pollution and on the other hand the materials to operate it are also running out and running out. The electric motor can be the answer to various problems that exist today and even in the future, because the electric motor has better efficiency than the combustion motor. The disadvantage of an electric motor is that the price is quite high when compared to a combustion motor, but on the other hand, such as the maintenance and efficiency of the energy source of an electric motor, it is far superior. In addition, with the electric motor, it can overcome the problem of natural resource fuel, which is increasingly shrinking.
Adaptive Traffic Light Controller Based on Congestion Detection Using Computer Vision
Authors: Putra R G , Pribadi W , Yuwono I , Sudirman D E J , Winarno B
Published: March 2021

The transportation sector plays an important role in realizing a smart city. The increase in the number of vehicles is currently not supported by an increase in road capacity. Traffic jams or congestion will occur in many places. Congestion will increase the accident rate, bad effect on economic growth, and increase gas emissions. Effective traffic management is necessary to reduce congestion levels and its side effects. A traffic light is one of traffic management methods. Traffic lights control the flow of traffic at road intersections, zebra crossings, and other traffic flow points. Conventional traffic lights work on a pre-programmed time sequence. This system is effective if the vehicle density is relatively constant. The density of vehicles from various directions fluctuates with time. To increase the effectiveness of using traffic light, an adaptive system is needed. In this study, a simple adaptive traffic light mechanism was developed based on congestion on the road using computer vision. Vehicle congestion is detected using the YOLOv3 object detection which detects the type of vehicle. The detection system used by YOLOv3 with pretrained weight COCO has a true positive value for motorbikes of 60%, cars (light vehicles) 93%, and trucks/buses (heavy vehicles) 100%. The processing speed of the Jetson Nano mini-PC with the OpenCV library on the GPU is 2 times faster than the process with the CPU.
Design of Water Brake Dynamometer
Authors: Romandoni Nanang , Aminudin Achmad , Faizin Kholis Nur , Puspitasari Indah , Agus Alfi Tranggono Salim , Aziz Abdul
Published: March 2021

The dynamometer is equipment that functions to measure the power and torque generated by the internal combustion engine. The dynamometer has a way of working, namely absorbing mechanical energy generated by the engine at the engine output shaft rotation. The types of dynamometers is the electric dynamometer, eddy-current dynamometer, water brake dynamometer, prony brake, and fan brake. This study aims to obtain a dynamometer design that is simple and has relevant measurement accuracy. This water brake dynamometer is designed to withstand / test engine power up to 13 horsepower. The transfer of power from the engine to the dynamometer is done by adding a shaft and jaw coupling. Torque measurement will use load cell, meanwhile to measure revolutions per minute using proximity sensor. The test will be carried out by measuring the 118cc engine power with the SAE J1349 test method.
A study on the Performance and Reliability Effect of Low-Rank Coal to the Steam Power Plant
Authors: Yudisaputro H , Caesarendra W , Yuniarto M N , Yohanes
Published: March 2021

The main purpose of utilizing lignite coal in Indonesia is to decrease fuel costs in electricity and Greenhouse Gas emissions. Still, on the other hand, it will affect the reliability and plant performance. This paper attempts to evaluate 340 MW subcritical coal-fired power plant’s performance and reliability by comparing the impact of coal utilization below boiler design toward the baseline and identifying the significant factors that lead to plant efficiency and reliability. Performance tests conducted using the standard procedures at four segments of load, i.e., 50%, 65%, 80%, and 95%, with two scenarios: (1) use 3500 kcal/kg of coal calorific value, and (2) use 4500 kcal/kg of coal as the baseline. There are no adjustments during the test and all measurements, including pressure, temperature, flow, bomb calorimeter, etc., already calibrated. The results show that during 3500 kcal/kWh, 100% of the load is unable to reach. Plant performance becomes higher up to 2930 kcal/kWh, boiler efficiency decrease to 80.4%, and fans current increase to maximum capacity. The study’s conclusion suggests that the utilization of LRC must be considering the energy amount to the boiler.
Robust Face Tracking using Improved Mean Shift Algorithm
Authors: Setyawan S B , Arrosida H , Sudaryanto A , Yudha R G P
Published: March 2021

Face tracking is important system for robotic. The problem is that it is less resistant to occlusion and noise. Robust face tracking algorithm in this paper using improved mean shift algorithm is proposed. This algorithm consist of face detection and tracking. The face identification is done by the Viola-Jones algorithm. Then, Mean Shift algorithm is done to track face as a target and improve robustness from occlusion. CBWH is added in face as target to reduce noise. The experimental results prove that it is robust from noise background and occlusion..
Strategic Planning for Polytechnic Information Systems with an Enterprise Architecture Planning Approach
Authors: Tanto  , Meilano R , Stiawan D , Malik R F
Published: March 2021

Higher education institutions in implementing information systems need strategic planning, especially for Polytechnics in Indonesia. It is intended that the application of the information system is in accordance with the vision, mission and objectives of the Polytechnic. The Polytechnic information system strategic planning uses the Enterprise Architecture Planning method. The Enterprise Architecture Planning method provides an overview of data architecture, application architecture and technology architecture from the application of information systems so that the Polytechnic is not wrong in implementing information systems. The result of this research is the form or formulation of information system strategic plan which is suitable for higher education especially for Polytechnic. The information system strategic plan consists of a data architecture, there are 41 entities, while for data and application architectures there are 8 application candidates. In addition, the results of the information system strategic plan in the technology architecture section to support the Polytechnic business processes are also built.
Effect of Concavity Configuration Parameters on Hydrodynamic and Thermal Performance in 3D Circular Pipe using Al2O3 Nanofluid Based on CFD Simulation
Authors: Alhamid Jassim , Al-Obaidi Ahmed Ramadhan
Published: March 2021

Enhancement of heat transfer by employing nanofluids have obtained important consideration over the past two decades. Nanofluid types are appropriate as the alternative working fluid for many different fields, such as automotive, air conditioning, electronics, nuclear applications, and power generation. Flow behaviour structure and heat performance and the hydrodynamic thermal characteristics of Al2O3 Nanofluid under different concavity (dimple) configuration parameters, are numerically analysed through using ANSYS FLUENT technique.

The Nanofluid is used in a three-dimension circular pipe with modified varying dimple diameters (d = 1, 2, and 3 mm) are applied for computational calculations and compared with a smooth plain pipe under different operating conditions. The outcomes of CFD analysis are presented the generation of more turbulence flow near pipe wall area can effectively improve heat transfer in dimple pipe due to the vortex flow can cause more destruction in boundary flow layer that leads to of boundary layer thickness to become thinner hence the shear stress at pipe wall is augmented. Moreover, The Nu number of dimple diameter of 3 mm is higher than other cases. The average value is 51% higher than the normal pipe. Furthermore, the dimple pipes’ performances with a concavity diameter of 1 mm have advantages than other concavity diameters under similar corrugation conditions.
Smart Home Light Based Service Oriented Architecture and IoT
Authors: Irawan Yuda , Chrismondari  , Yolnasdi  , Linarta Ari , Muhardi  , Febriani Anita
Published: March 2021

The development of technology is very rapid in everyday life, so that it provides benefits for each. One of the advantages is that with technology, users can control electronic equipment which can be done with the smart home application (Smart Home) and from anywhere. This smart home application can help users control household electronic equipment such as lights, air conditioners, TVs, dispensers and others so as to reduce the waste of electricity when users forget to turn off household electronic equipment when traveling outside the house or anywhere. users are located. This research applies the concept of Service Oriented Architecture (SOA) and Internet of Things (IoT) on smart home light by integrating Ras-berry Pi with Python programming, web server (database) with PHP and An-droid programming with Java programming, and in experimental research that will be controlled. is the house light. The results of this research are in the form of a prototype of a home light controller using the IoT concept, web service and the Android SOA Smart home application with 7 buttons to control / monitor lights and this system is integrated with the concept of Service Oriented Architecture which is equipped with a token as system security. Tests have been carried out by controlling house lights remotely using a smartphone via the internet net-work and the results can be controlled properly.
Timber as a Pavement Construction Material: Design and Application
Authors: Lolo Dina Pasa , Wardani Sri Prabandiyani Retno , Setiadji Bagus Hario
Published: March 2021

Roads are one of the most important infrastructure to increase economic growth, accelerate the flow of goods and communication between regions. Therefore, in building road infrastructure it is necessary to pay attention to using materials which appropriate the specifications. Limited pavement materials in an area or region is one of the problems faced by government. It is causes that very important to looking for replacement material that can be used to overcome the problem of material limitations. This study use Bus timber as a substitute material for aggregate in subbase course. It is considerate that Bus timber is often used in timber bridge construction. Bus timber will be made as a raft foundation. At the end of this study, the expected result is that bus timber can be used as pavement material especially for subbase course.
An Investigation of Shaft Failure on Induced Draft Fan in A Steam Power Plant
Authors: Hermawan Heru , Caesarendra Wahyu
Published: March 2021

A failure phenomenon on induced draft fan (IDF) shaft became a crucial attention in Power Plant with capacity 350 MW because the failure is catastrophic without early warning information. Also, the failures on the IDF shaft occurred in a short period within two months. This paper reported an investigation and evaluation of the root cause of the failure by vibration data monitoring and material analysis. The objective of the investigation and evaluation is to identify the main root cause and specific symptoms of IDF shaft failure. According to the data collection and analysis result, each phenomenon indicated an identical vibration pattern, however, the duration of each step is different. A series of tests of shaft samples was carried out to get comprehensive information, such as chemical composition test, tensile test, hardness test, microstructural examination (SEM), and fractography examination. The shaft repair procedure was also evaluated. The results were showed that multi initial of micro-scratch and martensitic embrittlement played an important role in the shaft failure. Micro-scratch triggered high-stress concentration on shaft surface. Martensitic embrittlement was found on weld metal and heat-affected zone.
An implementation of module management controller for MicroTCA data processing system
Authors: He C. , Zhang J. , Cai Y. , Zi C. , Jiang X.
Published: March 2021

On the basis of full compatibility with advanced telecommunications computing architecture (ATCA) standard, micro telecommunications computing architecture (MicroTCA) standard has a evident advantage over ATCA in terms of space, cost and scalability. The MicroTCA standard has become a popular platform in high energy physics. For the advanced mezzanine card (AMC) installed in the MicroTCA chassis, module management controller (MMC) is a prerequisite to fulfill its function. Although there are many MMC solutions, most of their firmware work in polling mode and rarely use the real-time operating system (RTOS). In order to overcome the lack of real-time performance in polling MMC solution, the novel firmware is developed based on FreeRTOS, which is an open source real-time operating system. This firmware implements the basic functions of MMC, such as hot swap, power management, firmware upgrade, and adds the feature of serial command debugging. To verify the difference in real-time performance between the FreeRTOS and the polling solutions, the interrupt reaction time test is carried out on both solutions. The test shows that the average interrupt reaction time of the FreeRTOS solution is about 300 ms shorter than that of the polling method. This result proves that the FreeRTOS-based solution can significantly improve the real-time performance of transaction processing.
Streambank Erosion Prediction
Authors: Saadon Azlinda , Abdullah Jazuri , Ariffin Junaidah
Published: March 2021

Bank instability as a result of flow fluctuations may lead to massive bank erosions and subsequent damage of adjacent properties. Continuous erosion process promotes change in the river morphology, sedimentation problems due to the presence of secondary currents and local scouring at piers downstream of the erosion point. Knowledge on the extent of erosion should facilitate river engineers to resolve issues on river training works and river sedimentation problems. A study has been carried out in the field to quantify the amount of eroded materials using erosion pins that were driven into the ground normal to the bank surface. The erosion pins consist of 6 mm diameter metal rods and 60 cm – 80 cm in length. A spatial variation profile for rates of erosion has been identified with units expressed in unit cm per day. The defining parameters for bank erosion rates have included near-bank velocity, Ub, water depth, Y, stream bank geometry and soil bearing capacity. Development of empirical equations had used multiple linear and nonlinear regression techniques to determine the significant erosion predictors. It takes into consideration the coefficient of determination (r-squared) and Root-mean square error (RSME) as determinants for best predictors. Accuracy of developed equations is measured using the discrepancy ratio, D.R. This is the ratio of predicted to measured erosion rate. Analysis suggest that the equation derived using polynomial function (order-2) gave better accuracy compared to the equation derived using linear and power functions. An accuracy of 75% has been obtained. Scatter plots of the predicted to the measured erosion rates have shown to be between 0.5 – 2.0 within the line of good agreement.
The effects of different water temperatures on survival and growth rate of juvenile invasive apple snail, Pomacea canaliculata (Lamarck, 1822) under controlled environment
Authors: Md Latip Siti Noor Hajjar , Clement Marie Urai
Published: March 2021

Invasive apple snail, Pomacea canaliculata is one of the major mollusc pests affecting rice production in Malaysia. This pest not only gives fatal effects to rice but also decreases the water quality in the ecosystem due to the use of pesticides to control it. With the unpredictable changes on global climatic in Malaysia, it is important to have knowledge on the effect of water temperature on growth and survival rate of P. canaliculata in water bodies, in order to avoid loss in paddy field and its adverse effects on aquatic ecosystems. Water temperature is one of the most important environmental factors influencing the survival, growth rate, reproduction and behaviour of freshwater snails. The aim of this study is to evaluate the growth and survival rate of juvenile P. canaliculata at different temperature regimes. Growth and survival of juvenile P. canaliculata were evaluated at different constant water temperatures (15, 20, 25, 30 and 35°C). Our findings show, at 30° C the growth rate of P. canaliculata is higher compared with the other temperatures, however had low survival rate. Meanwhile, at room temperature (21 - 24°C), a higher survival rate (100%) was recorded. The results showed that different water temperatures affect the growth and survival rate of P. canaliculata and it is an important indicator for predicting and understanding the changes of water temperature when controlling this pest.
Optimization of Water-Food Nexus System under Dual Uncertainties
Authors: Ma Y , Li Y P , Huang G H
Published: March 2021

In this study, a fuzzy chance-constrained programming (FCCP) method is developed to synergetic plan water-food nexus (WFN) system under dual uncertainties. The developed method can tackle uncertainties expressed as probabilistic distribution and flexible parameter. Then, a FCCP-WFN model is formulated for the city of Jinan (China), in which 72 scenarios are designed with the consideration of different food demand levels, constraint-violation risk levels, and satisfactory degrees. Results indicate that (i) surface water would be the main water source for Jinan (accounting for 62.7% of water supply), and agriculture would be the largest water consumer (accounting for 55.5% of water allocation), therefore, rational management of surface water and reduction of agricultural water allocation are essential to alleviate the water shortage problem in Jinan; (ii) the annual arable land area is 628.4×103 ha to 683.4×103 ha, of which grain crops account for 62.1%, and the sufficient grain planting area can ensure food security in Jinan; (iii) uncertainties have significant influence on water allocation schemes, thus, managers should consider the impact of uncertainties during decision-making process, and make different management schemes according to different attitudes to system risks under undetermined conditions.