Zinc oxide (zinc oxide, ZnO) is one of the main components of perovskite solar cells (PSC), namely electron transport material (ETM). Improvement of perovskit solar performance can be achieved by modifying the electrical and optical properties of its ETM by doping from other elements. In this research, seleniumdoped ZnO (Se-ZnO) thin film has been fabricated onto fluorine-doped tin oxide (…
Silver nanoparticles has wide range of applications, such as antibacteria, antivirus, catalyst, sensors and photovoltaic. Synthesis silver nanoparticles (AgNPs) using green extract mediation become more popular recently because this process is environmentally friendly, safe, and cost effective. In this study, silver nanoparticles has been synthesized using yellow watermelon rind extract. Waterm…
Research on the analysis of underground water in Rimbo Panjang Village using Sclumberger Geoelectric and Hydrogeochemical methods. Geoelectric is a method used to determine the nature of electric currents in the earth by detecting on the surface of the earth. Identification of the aquifer layer was carried out on 2 lines with a length of 100 meters. Based on the results of the analysis using pr…
This study aims to design a computer program to detect myocardial ischemic through ECG signal patterns and their accuracy. Myocardial ischemia is a heart disorder due to narrowing of blood vessels in the heart wall. The method used is a backpropagation ANN based on Simulink Matlab. Input data trained to recognize target ECG signal patterns based on potential and time in the ST segment. The …
Volume is one of important quantities to sorting process for oil palm fresh fruit bunches (FFB). Computer vision method is an alternative method to estimated volume, which is non-destructive method and provide the quick time show the result. This study is focus to build computer vision system to determine the volume of oil palm FFB using the ellipsoid equation and segmentation process by S…
Research on magnetic characteristic and element content identification from the natural sand of the Rokan River in Riau Province has been done. Sand samples were taken from 5 points with 10 kilograms per point from Rokan River. The samples are dried in the sun before separation between magnetic particles and non-magnetic particles using Iron Sand Separator, this result is called concentrate 1. …
Research on magnetic characteristic and element content identification from the natural sand of the Rokan River in Riau Province has been done. Sand samples were taken from 5 points with 10 kilograms per point from Rokan River. The samples are dried in the sun before separation between magnetic particles and non-magnetic particles using Iron Sand Separator, this result is called concentrate 1. …
The components of sweetness of fruit consist of fructose, glucose and sucrose. The amount of sugar that makes up the sweetness of the fruit always varies but the total amount has never exceeded 30%, so characterization is needed to determine the nature of amount of sugar at various concentrations. Characterization is based on impedance measurements using a PCI 6221 card for data acquisition con…
Silver nanoparticles were successfully synthesized using red dragon fruit peel extract (Hylocereus polyrhizus) as a bioreductor. The synthesis process was mixed the solution AgNO3 1 mM and red dragon fruit skin extract with a volume comparison of 1:3, 1:5 and 1:7 and then mixed with a few drops of NaOH solution 1M until the solution has a pH of 10 each. The solution was stirred using a magn…
Research on the importance of magnetic susceptibility, mass susceptibility and heavy metal content due to automotive contaminants has been performed. The method used to identify heavy metals in this research is experimental method. magnetic susceptibility and X-ray fluorescence. Samples were collected from three main roads in Pekanbaru city namely : Sudirman Street, Ahmad Yani Street and Panger…
This study aims to develop LKPD for science learning based on the SETS approach to improve students' conceptual understanding of global heating material for grade VII SMP and to find out the validity of the science learning worksheet that has been developed. The science learning LKPD development model used is the Research and Development (R & D) model with the 4D model design developed by S. Th…
Student motivation is still low, time is limited in learning physics, and there are some abstract learning materials that are difficult to understand, resulting in misconceptions. So a research was carried out on the development of powtoon-based learning videos with the flipped classroom approach on temperature and heat material for class XI SMA which aims to develop and determine the validity …
The student centered of physics instruction necessitates students to acquire theories, concepts, and principles of physics which are independently constructed by the students themselves. Few if any students enable to understand the complex and abstract concepts of physics theories as it provides diverse symbols, illustrations and equality. The conventional instructional process appears not to f…
The biosynthesis of ZnO photocatalyst material in the form of thin films is increasingly needed as an environmentally friendly alternative to chemical and physical methods, especially in large-scale water purification processes. The aim of this research is to produce a ZnO-based photocatalyst material in the form of a thin layer through an environmentally friendly method and optimize the surfac…
Ferroelectric is one unique materials to be studied and investigated. This material is also applied as a device in electronics such as capacitors, because this material is a dielectric material that has spontaneous polarization and has the ability to change its internal polarization using an appropriate electric field. In this study to increase the capacitance and the dielectric constant values…
The Preparation of ZnO nanoparticles with a method that is simple, inexpensive and utilizing plant extracts as surfactants and stabilizing agents such as hexamethyl tetramine (HMT) and polyvinyl pyrolidone (PVP) and to produce a unique morphology with biosynthetic method has attracted much attention of researchers. In this study, the biosynthesis of ZnO nanoparticles was carried out using the p…
This study aims to create a product in the form of a printed module and a CD containing AR applications. The AR application on the CD is transferred and installed to the mobile phone. Augmented reality technology in the form of 3D animation and video appears by scanning markers or images in the module using the AR application camera on the mobile phone. One of the 3D animations shown is the ear…
This study aims to find out the learning difficulties of students in grade X straight motion materials during the corona pandemic at SMA Negeri 1 Keritang. The population in this study was all students of grade X MIPA at SMA Negeri 1 Keritang. Samples in this study were taken in a simple random sampling so that 29 students were obtained in the study sample. Instruments in this study used diagno…
Misconceptions cause new knowledge that students have cannot be connected with their cognitive knowledge so that the understanding of the student's concept becomes weak. This indicates that misconceptions need to be identified as early as possible. One way to identify misconceptions is to use diagnostic test instruments. The study aims to develop two-tier diagnostic tests on light subject matte…
This study aims to design and produce physics learning media using the Articulate Storyline 3 application on Newton's law material for class X which is valid. The research method used is research and development or Research and Development with the ADDIE development model. The ADDIE stage carried out is Analysis, Design, and Development. Media validation is seen from 5 aspects, namely the subje…