The use of sentul fruit peel (SandoricumKoetjape) as a biostabilizer in the fabrication of zinc oxide (ZnO) nanoparticles has been carried out as an alternative way to environmentally friendly production. This study aims to obtain zinc oxide (ZnO) nanoparticles by reacting 0.2 M Zn(NO3)2.6H2O (zinc nitrate hexahydrate) precursor solution with sentul fruit peel extract (KBS). Samples were va…
The biosynthesis of silver (Ag) nanoparticles has been carried out by reacting pineapple peel extract and AgNO3 solution. Ratio of the composition of the extract and the AgNO3 solution, namely, 1: 1 by varying the AgNO3 concentration of 1 mM, 2.5 mM, and 5 mM. The nanoparticle synthesis process was carried out at 80oC for 30 minutes. The nanoparticles obtained were characterized using UV-Vi…
Activated carbon with high porosity and controlled pores structure are widely applied as supercapacitor electrodes biomass that derived from sago midrib (PS). Activated carbon based on sago midrib without chemical agent and using chemical agent ZnCl2 and NaOH by a concentration 0,5 M has been fabricated with a purpose to produce distribution of mesopores and micropores. Samples were carboni…
This study focuses on the effect of using longan leaf waste as a supercapacitor electrode with variations in the concentration of ZnCl2 in the form of 0.3 M, 0.5 M, 0.7 M. Carbon electrodes from longan leaves were carbonized at a temperature of 600ºC followed by a physical activation process using CO2 at a temperature of 850ºC for 2.5 O'clock. The XRD characterization has a sloping peak w…
This research aims to see the regularity pattern of monthly rainfall in Pekanbaru City by making a rainfall fractal analysis program. The data on this research is used data from 2016 to 2020. These data would be analyzed using R2015a matlab application with Exponen Hurst metohd. The Exponent Husrt value was obtained after analyzed data from logR/S slope regression with log(n) so fractal dim…
Coconut is a kind of tropical fruits which can grow well in Indonesia. Coconut coir fiber can be a potential activated carbon because coconut fiber contains lignin which is quite high, namely 35% -45%. This study aims to see the effect of physical activation temperature on the specific capacitance of activated carbon electrodes from coconut coir biomass with NaOH used as an activating agent…
The purpose of this research is to develop e-module teaching materials assisted by Kvisoft Flipbook Maker on work and energy materials for high school students in class X. The development of e-modules is carried out as a solution to the difficulties of learning physics, as well as the lack of use of learning media in the physics learning process. The type of research used is research and de…
The learning device developed is a learning tool based on the Hybrid Learning model using Schoology media on vibrations, waves, and sounds for class VIII SMP, consisting of a Learning Implementation Plan (RPP), Student Worksheets (LKPD), and Learning Outcomes Test. The purpose of this study was to determine the validity of learning tools based on the Hybrid Learning model using Schoology media …
Research on magnetic susceptibility, mass susceptibility and heavy metal contents of palm oil plantation soil as a function of depth have been done at the Instrumentation and Magnetic Laboratory, FMIPA UNRI. Samples were collected from palm oil plantations soil located in Tapung, Kampar, Riau. Samples were taken as many as 54 samples from 9 points as a function of depth and each sample has…
Fiber Bragg Grating (FBG) has been widely applied in optical materials or materials for temperature and strain measurement. The choice of this FBG is because it has high sensitivity with small resources. FBG can be used to determine the characteristics of the effect of changes to temperature variations in honey. This study aims to analyze the effects of temperature variations on honey on th…
Supercapacitor is an energy storage device that has a high energy and power density. Supercapacitor cells have components called electrodes. In this study, supercapacitor electrode cells were made from activated carbon based on palm fiber biomass. This study aims to determine the effect of variations in carbonization temperature on activated carbon supercapacitor electrode cells made from p…
Wireless fidelity (Wifi) signal is an electromagnetic wave that in its application does not require intermediary media for communication purposes. The intensity of the signal is strongly influenced by the media passed, such as the humidity function, temperature and source position. Wifi signals can also experience interference from other electromagnetic waves that have the same frequency. E…
The consumption of sugar in food and beverages in recent years has increased significantly, so that it can increase the risk of various diseases. Based on this, a method to monitor and minimize the risk of the disease is needed. In this study, Saccharomyces cerevisiae yeast was used as a bioreceptor using a Clark type oxygen sensor based on Pt-Ag electrodes with the principle of amperometri…
The decline in the quality of aquatic resources due to industrial and agricultural activities and is a threat and impact to existing organisms in the water. Algae are the largest oxygen producers and play an important role in the quality of the waters, the vitality of algae can be seen by the increase in oxygen that the algae emits during photosynthesis. Based on this, in this study the alg…
Indonesia is one of the largest producers of palm oil in the world which has 50% of palm oil waste in the form of Palm Oil Mill Effluent (POME) with a high level of Chemical Oxygen Demand (COD), causing pollution in the waters, so a method is needed to detect dissolved levels Oxygen (DO). This study aims to detect contamination of water bodies by POME waste using a biosensor based on the a…
The effect of two-stage ball milling on the magnetic susceptibility and particle composition of the natural sands of Rokan River has been carried out. The sample was processed using Iron Sand Separator (ISS). The product of ISS was milled using ball milling for 80 hours using two stage ball milling with time variations for 20 hours, 30 hours and 40 hours with milling ball diameter of 1.5 cm…
Technological developments in the industrial sector have made very significant progress, one of which is in the material processing industry for metal sorting originating from metal material waste. In this study, a metal type determination system was developed based on the susceptibility value of the magnetization curve. This magnetization curve instrument is a magnetic field measuring ins…
Utilization of ketapang leaf (Terminalia Catappa L) waste as a supercapacitor electrode has been successfully carried out with variation concentration of ZnCl2 activator, namely 0,3 M, 0,5 M and 0,7 M. Carbon production was started from drying the ketapang leaves in the sun ray and a 110°C oven, pre-carbonization, ball-milling and mortar, sieving, chemical activation, molding, carbonizatio…
A thin film of Barium Zirconium Titanate fabricated with sol-gel method with composition of x= 0.80 and x= 0.85 was annealed with temperature variation of 550°C, 600°C and 650° C for 1 hour. Barium Zirconium Titanate thin films were characterized using X-Ray Diffraction (XRD) method. Based on the XRD pattern, the lattice parameters, crystal structure, and crystal size can be determined. …
Helium plasma source modeling was performed in order to obtain species density at balanced conditions under pressure of 1 atm. The software used in this modeling is matrix laboratory software (MATLAB). The equation used is a continuity equation that depends on the position and parameters of Arrhenius. Plasma temperatures used were 0.1 eV, 0.2 eV, 0.3 eV, and 0.5 eV. Species involved in pla…