Supercapacitor is energy storage devices consisting of electrodes, electrolyte, current collectors, and separator. In this research, carbon electrodes are made from young coconut fiber biomass (SKM) waste using ZnCl2 0.5 M as activation agent and variations in physical activation temperatures. Carbon electrodes preparation begins with a pre-carbonized process of 200ºC...
One type of cervical cancer treatment is brachytherapy using the Manchester system. In this study, isodose curves were analyzed on tissue phantoms irradiated using several types of radioactive sources with the Manchester system using Monte Carlo simulation, EGSnrc. This study used a homogeneous tissue phantom with dimension 10 × 10 × 10 m3. The Manchester system uses 2 ovoid and...
The development of telecommunication antenna technology is increasingly being considered with the need for high and practical antenna performance. The antenna technology can be realized by using the split ring resonator (SRR) metamaterial structure. SRR metamaterial is a periodic material that has minimal manufacturing dimensions and is able to work at high frequencies. The...
The addition of additives to paint aims to improve the quality and usability of paint. Natural additives, such as bintaro seed extract, have potential as anti-bacterial and anti-fungal agents. This study aims to investigate the physical properties of commercial paints added with bintaro seed extract. The physical properties tested were changes in density and adhesion. While the...
Geoelectric is a geophysical method used to determine the geological conditions of the earth's subsurface based on the variations of rock resistivity value. Interpretation of the aquifer layer is carried out on 2 paths with a length of 300 meters each. The lithology of the study area consists of layers of clay, peat, clay, sand, coarse sandstone, dry gravel, mudstone, limestone...
Hydroxyapatite (HAp) is a ceramic biomaterial that is highly biocompatible and employed in a variety of biomedical applications. Its chemical formula is Ca10(PO4)6(OH)2, comprising calcium and phosphate, the primary minerals found in bones and teeth. The precipitation method can be used to change the structure of hydroxyapatite by replacing strontium ions (Sr2+) with calcium ions...
Paper is a thin sheet-shaped material containing cellulose from wood. The high demand for paper makes the raw material for paper production increase, which causes forest exploitation. As for this study to determine the effect of mixed variationsin the mixture made from ater hyacinth and cassava peel with the adition of NaOH solution, the characteristics of the paper produced, and...
In this study, Cr-TiO2/α-Fe2O3 nanocomposite was prepared by the ball milling method, incorporating chromium, titanium dioxide (TiO2), and iron oxide (α-Fe2O3) nanoparticles extracted from Logas-Kuansing natural sand. The structural, magnetic, morphological, and optical properties of these nanocomposites were investigated using X-ray diffraction (XRD), vibrating sample...
Biomass is an environmentally safe and cost-effective source of activated carbon (AC) for supercapacitors (SC). In this study, AC was generated using precarbonisation and activation with KOH using rubber seed shell (RSS) as a precursor. The electrochemical performance was investigated by cyclic voltammetry and galvanostatic charge-discharge determination and the ACs were...
The need for predictions is very necessary in various sectors of life, one of which is rainfall predictions. The threshold value for PM10 particles that is allowed to be in ambient air is, 150 µgram/m3/day). The aim of this research is to create a dynamic model predicting Pekanbaru City's rainfall for the next 3 years. Rainfall prediction in this research was carried out using...
Biomass-based porous carbon is an exceptional material with unique nano-morphological properties and a high surface area, making it an ideal candidate for improving the performance of supercapacitor electrodes. Herein, activated carbon derived novel areca-nut waste (ANW) as electrodes materials were successfully produced using a simple method. The process involved drying the ANW...
The demand for low-cost carbons with multi-doping in supercapacitors has led to a significant focus on utilizing biomass waste to produce activated carbons. The research successfully utilized Musa paradisiaca L. (MPL) peel as a porous carbon for solid-state supercapacitor. The process involved collecting banana peel waste, drying the peels using sunlight, pre-carbonization using...
Teacher competency standards serve as benchmarks that can be utilised to assess the attributes deemed essential for professional competence in educators. Educators play a crucial and strategic role in the pursuit of national development objectives, particularly within the realm of education. However, the objective of education appears to be a reduction in competency standards at...
The biosynthesis of zinc oxide nanoparticles (ZnO) is extensively studied because of its eco-friendly and simple method. Piper ornatum is abundant in Indonesia, and the phytochemical content of Piper ornatum leaves has the potential to be a reductor. The study aims to study the role of Piper ornatum in biosynthesis and the characteristics of the zinc oxide nanoparticles. The...
Raman and infrared (IR) spectra of xMn2O3(1-x)P2O5 glasses (x = 5 mol% – 25 mol%) are reported. The spectral shift is related to changes in the coordination of the neodymium ion. The changes observed are consistent with an elongation of P–O- terminal and P–O–P bridging bonds in the PO4 tetrahedra.
Activated carbon is a material containing 85% – 95% carbon elements and is a porous solid. This activated carbon is the result of heating materials containing carbon at high temperatures but not oxidized. In this study, the material used is sugarcane bagasse, and its activator is NaOH. The purpose of this research is to examine the production of Activated Carbon from Sugarcane...
Fibre optic sensors have garnered considerable attention from scientists, leading to the extensive use of optical fibres as sensors for monitoring strain and temperature. The increasing adoption of fibre Bragg gratings (FBG) can be attributed to their enhanced sensitivity and rapid transmission speed. The objective of this study is to examine the pressure distribution of FBGs...
Coffee is one of the plants that is widely cultivated in tropical countries such as Indonesia. Coffee plantation commodities at least contribute a lot to the Indonesian economy, which creates foreign exchange, farmer income, industrial raw materials, employment, and regional development. This research aims to design coffee bean dryer equipment using a heater as a heating element...
Improving dose optimization during clinical planning using the treatment planning system for radiotherapy patients is crucial, yet executing this process can be time-consuming and reliant on the expertise of medical physicists. This research focuses on dose prediction employing machine learning for the planning target volume (PTV) and organ at risk (OAR) in cases of brain cancer...
The magnetic susceptibility value and alterations in the composition and dimensions of iron oxide particles in the natural sand from the Rokan River, which were prepared using ball milling (BM), have been measured. Prior to undergoing the BM procedure, the sample's magnetic and non-magnetic particles are initially separated using an iron sand separator and a neodymium iron boron...
Everyday life requires a food processing component known as cooking oil. Repeated use of cooking oil can reduce its quality and cause it to have high levels of free fatty acids and peroxides. The purpose of this study was to find out how to purify cooking oil using activated carbon made from Barangan banana peels to reduce the amount of free fatty acids and peroxide value. The...
A supercapacitor is an electrochemical device that integrates power supply and charge storage capabilities. The primary constituents of a supercapacitor consist of electrodes, separator, electrolyte, and current collector. This work focuses on the production of carbon electrodes using coconut fibre biomass waste. The carbonisation process is carried out at three different...
Leakage of liquified petroleum gas (LPG) cylinders or devices is still one of the main causes of fires known for its flammability so that leaks in LPG are at high risk of fire. To overcome this, a tool is made to prevent crime or gas leaks that often occur to homeowners. This research was conducted to find out the security control system for homeowners and overcome if a gas leak...
The separator is a crucial element in lithium-ion batteries that is positioned between the anode and cathode. Its primary function is to prevent direct contact between the electrodes, hence avoiding electrical short circuits. Lithium ion battery separators are typically composed of polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN) polymers, which possess excellent ionic...
Water is the most important element in human life, because almost all human activities require water, especially clean water which has a main function that cannot be replaced by other compounds. The aim of this research was to determine the quality of dug well water after the filtering process using corncob activated carbon and zeolite, as well as to find out which variations are...